Abstract:
In a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the first base station supporting coordinated multi-point transmission and reception (CoMP) is disclosed. The wireless communications method comprises receiving from the second base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, and performing interference aware scheduling. Other methods, systems, and apparatuses also are disclosed.

Description:
[0001]    This application claims the benefit of 
         [0000]    U.S. Provisional Application No. 62/055,381, entitled “Signalling for Inter-eNB CoMP,” filed on Sep. 25, 2014,
 
U.S. Provisional Application No. 62/056,095, entitled “Signalling for Inter-eNB CoMP,” filed on Sep. 26, 2014,
 
U.S. Provisional Application No. 62/076,221, entitled “CSI Exchange for Inter-eNB CoMP,” filed on Nov. 6, 2014,
 
U.S. Provisional Application No. 62/076,873, entitled “CSI Exchange for Inter-eNB CoMP,” filed on Nov. 7, 2014,
 
U.S. Provisional Application No. 62/110,006, entitled “CSI Exchange for Inter-eNB CoMP,” filed on Jan. 30, 2015,
 
U.S. Provisional Application No. 62/145,251, entitled “Efficient CSI and e-RNTP Exchange for Inter-eNB CoMP,” filed on Apr. 9, 2015,
 
U.S. Provisional Application No. 62/145,580, entitled “Efficient CSI and e-RNTP Exchange for Inter-eNB CoMP,” filed on Apr. 10, 2015,
 
U.S. Provisional Application No. 62/150,178, entitled “CSI Exchange for Inter-eNB CoMP,” filed on Apr. 20, 2015,
 
U.S. Provisional Application No. 62/151,796, entitled “Subband Definitions and eRNTP enhancements,” filed on Apr. 23, 2015,
 
U.S. Provisional Application No. 62/161,804, entitled “On the Subband Definition in CSI Signaling,” filed on May 14, 2015,
 
U.S. Provisional Application No. 62/162,285, entitled “eRNTP Signalling for Inter-eNB CoMP,” filed on May 15, 2015,
 
U.S. Provisional Application No. 62/204,541, entitled “Subband definition in CSI Signaling,” filed on Aug. 13, 2015,
 
the contents of all of which are incorporated herein by reference.
 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates to coordinated multi-point transmission and reception (CoMP) in wireless or mobile communications and, more particularly, to signalling in inter-eNB (E-UTRAN NodeB or eNodeB) CoMP. 
         [0003]    Referring now to  FIG. 1 , a CoMP mobile communications system  400  comprising a CoMP coordination zone or area or CoMP cooperating set  402  in which the embodiments may be implemented is illustrated. One or more user equipments (UEs)  410  are served by one or more TPs or cells  404  to  408 . TPs  404  to  408  can be base stations or eNBs. Each of the user equipments includes e.g. a transmitter and a receiver, and each of the base stations or eNBs  104  includes e.g. a transmitter and a receiver. 
         [0004]    Transmission layers are sometimes called “transmit layers” or “layers.” The number of transmission layers is known as “transmission rank” or “rank.” A codebook is a set of precoding matrices or precoders. A precoding matrix is also known as a codeword. 
       REFERENCE 
       [0000]    
       
         [1] RP-141032, “New Work Item on Enhanced Signaling for Inter-eNB CoMP,” June 2014. 
         [2] R3-142582, “Way forward on WI: Enhanced signalling for inter-eNB CoMP,” October 2014. 
         [3] R1-141206, “Signaling Considerations for Inter-eNB CoMP”, NEC, March 2014. 
         [4] R3-151209, Change Request, May 2015. 
       
     
       BRIEF SUMMARY OF THE INVENTION 
       [0009]    An objective of the present invention is to provide efficient channel state information (CSI) and/or relative narrowband Tx (transmit) power (RNTP) exchanges between eNBs. 
         [0010]    An aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the first base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, receiving from the second base station a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI), wherein the second base station receives from one or more user equipments (UEs) RI and CQI information. 
         [0011]    Another aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the second base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises receiving from one or more user equipments (UEs) rank indication (RI) and channel quality indicator (CQI) information, and for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, transmitting to the first base station a plurality of CSI reports each of which comprises an RI and a CQI. 
         [0012]    Still another aspect of the present invention includes a first base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The first base station comprises a receiver to receive from a second base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI), wherein the second base station receives from one or more user equipments (UEs) RI and CQI information. 
         [0013]    Still another aspect of the present invention includes a second base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The second base station comprises a receiver to receive from one or more user equipments (UEs) rank indication (RI) and channel quality indicator (CQI) information, and a transmitter to transmit to a first base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises an RI and a CQI. 
         [0014]    Still another aspect of the present invention includes a wireless communications method implemented in a wireless communications system supporting coordinated multi-point transmission and reception (CoMP) and including a first base station and a second base station. The wireless communications comprises transmitting from one or more user equipments (UEs) to the second base station rank indication (RI) and channel quality indicator (CQI) information, and for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, transmitting from the second base station to the first base station a plurality of CSI reports each of which comprises an RI and a CQI. 
         [0015]    Still another aspect of the present invention includes a wireless communications system supporting coordinated multi-point transmission and reception (CoMP). The wireless communications system comprises a first base station, a second base station transmitting to the first base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI), and one or more user equipments (UEs) transmitting to the second base station RI and CQI information. 
         [0016]    An aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the first base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises receiving from the second base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, and performing interference aware scheduling. 
         [0017]    Another aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the second base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises transmitting to the first base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, wherein the first base station performs interference aware scheduling. 
         [0018]    Still another aspect of the present invention includes a first base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The first base station comprises a receiver to receive from the second base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, and a controller to perform interference aware scheduling. 
         [0019]    Still another aspect of the present invention includes a second base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The second base station comprises a transmitter to transmit to the first base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, wherein the first base station performs interference aware scheduling. 
         [0020]    Still another aspect of the present invention includes a wireless communications method implemented in a wireless communications system supporting coordinated multi-point transmission and reception (CoMP) and including a first base station and a second base station. The wireless communications comprises transmitting from the second base station to the first base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, and performing at the first base station interference aware scheduling. 
         [0021]    Still another aspect of the present invention includes a wireless communications system supporting coordinated multi-point transmission and reception (CoMP). The wireless communications system comprises a first base station, and a second base station transmitting to the first base station an information element (IE) indicating multiple relative narrowband Tx (transmit) power (RNTP) thresholds, wherein the first base station performs interference aware scheduling. 
         [0022]    An aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the first base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises receiving, from the second base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, and using the UE ID to link the RSRP report with another measurement result for the UE. 
         [0023]    Another aspect of the present invention includes, in a wireless communications system including a first base station and a second base station, a wireless communications method implemented in the second base station supporting coordinated multi-point transmission and reception (CoMP). The wireless communications method comprises transmitting, to the first base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, wherein the first base station uses the UE ID to link the RSRP report with another measurement result for the UE. 
         [0024]    Still another aspect of the present invention includes a first base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The first base station comprises a receiver to receive, from the second base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, and a controller to use the UE ID to link the RSRP report with another measurement result for the UE. 
         [0025]    Still another aspect of the present invention includes a second base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system. The second base station comprises a transmitter to transmit to the first base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, wherein the first base station uses the UE ID to link the RSRP report with another measurement result for the UE. 
         [0026]    Still another aspect of the present invention includes a wireless communications method implemented in a wireless communications system supporting coordinated multi-point transmission and reception (CoMP) and including a first base station and a second base station. The wireless communications comprises transmitting, from the second base station to the first base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, and using at the first base station the UE ID to link the RSRP report with another measurement result for the UE. 
         [0027]    Still another aspect of the present invention includes a wireless communications system supporting coordinated multi-point transmission and reception (CoMP). The wireless communications system comprises a first base station, and a second base station transmitting to the first base station, a user equipment (UE) identification (ID) for a UE in a reference signal received power (RSRP) report, wherein the first base station uses the UE ID to link the RSRP report with another measurement result for the UE. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]      FIG. 1  depicts a block diagram of a CoMP system. 
       
    
    
     DETAILED DESCRIPTION 
     Embodiment A 
     A1. Introduction 
       [0029]    In the following we provide our views on channel state information (CSI) and enhanced relative narrowband Tx (transmit) power (eRNTP) exchange as well as proposals containing the required message structure. 
       A2. Discussion 
       [0030]    A2.1 CSI Exchange 
         [0031]    One eNB can send CSI report pertaining to one or more of its users to a neighboring eNB. 
         [0032]    For each UE the CSI that the eNB sends can comprise: 
         [0033]    CQI (channel quality indication): up-to 2 CQIs, each including a wideband CQI or component and possible sub-band differential CQIs or components 
         [0034]    RI: wideband component 
         [0035]    We note that the PMI was excluded from the CSI exchange report. The justification for this exclusion was to minimize the overhead and the fact that PMI can depend on fast changing channel information, thus reducing its utility over non ideal backhaul with a higher latency. However, in the absence of PMI the use of RI is limited. Indeed, any rank greater than 1 will convey only 2 CQIs, one for each of the two codewords. No further information about the (average) spatial directions seen by that user can be deduced by the eNB receiving the report. As a result, reporting the RI should be made optional. Moreover, the eNB requesting the CSI report should be able to able to specify whether or not it would like to receive RI reports. This can be achieved by setting a bit (for instance in the CSI Measurement Report type field) to be 0 if rank is not requested and 1 otherwise. Similarly, the eNB requesting the CSI reports should be able to specify whether or not it requires subband specific CQI reports. Another bit can be set to 0 if subband CQIs are not requested and 1 otherwise. The response of the eNB receiving the request can be mandated to comply with this request, i.e., that eNB can decide to include a rank indication in its response only if it is requested in the CSI measurement report type field of the corresponding request. Further, the subband specific CQI can be included only if they are requested in the CSI measurement report type field of the corresponding request. 
         [0036]    In this context, we note that a CSI process can be defined to be the reference process for another one. In that case the latter process will reuse the rank determined for its reference process. It can be beneficial to exploit reference rank in the X2 signalling as well. One way to achieve this is to include another bit in the CSI Measurement Report type field which specifies whether or not a single rank is requested. In particular, this bit can be set to 1 only if the rank request bit is also set to 1. In that case the eNB receiving the request should understand that the requesting eNB is requesting CSI reports where only one rank is reported for each user. The response of the eNB receiving the request can be mandated to comply with this request, i.e., if the eNB decides to include a rank indication in its response then it has to be one indication per user. 
         [0037]    Alternatively, no such mandate can be enforced, in which case it is up-to the eNB whether or not to include a rank indication in the CSI corresponding to each CSI-process of each user and the ranks indicated for a particular user need not be identical. 
         [0038]    One of the goals of CSI exchange was to facilitate centralized RRM. In a scenario with centralized RRM, the central node receiving the CSI reports should be able to keep track of the CSI information received for each particular UE, over all the received CSI reports. This can be achieved by including a UE identifier in each CSI report for each UE whose CSI is conveyed in that report. 
         [0039]    Moreover, for each CSI in the report, the CSI process configuration information should be included in order to convey the conditions under which the CSI was measured by the UE. This configuration information includes non-zero power CSI-RS information and IMR information (including, for example, the subframe indices and zero-power CSI-RS information). Since this configuration is anyway informed to the UE via higher layer signaling, for instance CSI-RS in tables 7.2.6 of TS36.213, and tables 6.10.5.2-1, 6.10.5.2-2 of TS36.211 and subframe indices in tables 7.2.6 of TS36.213, and table 6.10.5.3-1 of TS36.211, the same signaling can be reused to convey the configuration to the neighboring eNB. Another way of conveying this configuration information is through a look-up-table. A look-up-table mapping an index to each distinct applied CSI process configuration can be constructed for each eNB. Here, by an applied CSI process we mean a process that is used by at-least one served UE to measure its CSI. Such a table can be conveyed beforehand by it to eNB 1 , and then each report can include an index which will inform. Such a table can also be exchanged among neighbor eNBs first, and then the configuration information can be exchanged via indices. 
         [0040]    We note that the period specified in the request by eNB 1  to a neighboring eNB 2  (via the Reporting Periodicity of CSI Measurement Report field) can be different from the periodicity with which the CSI is measured by a UE as per a CSI process, and then reported (over the air) to eNB 2 . To address such scenarios, eNB 2  can either subsample (for example select the most recently received CSI) or average (over all CSIs received after those considered while determining the previous response) and send its response to eNB 1 , for example, about the CSI process configuration information. Note that the averaging can be done over the CQIs for a given codeword, given rank and given subband. The most recent received rank can be used for averaging. 
         [0041]    A2.2 eRNTP Exchange 
         [0042]    Our view on eRNTP exchange is captured in a corresponding proposal. 
         [0043]    We note that the RNTP for the first subframe is always conveyed. If no information about the downlink (DL) power restriction on any subsequent subframe is conveyed, then the one conveyed for the first subframe can be assumed to remain static (i.e., applicable over subsequent subframes). 
       A3. Conclusion 
       [0044]    We discussed the necessary X2 message to support CSI and eRNTP exchange for inter-eNB CoMP and presented corresponding proposals. 
         [0045]    Proposals 
         [0046]    9.1.2.1 LOAD INFORMATION 
         [0047]    This message is sent by an eNB to neighbouring eNBs to transfer load and interference co-ordination information. 
         [0048]    Direction: eNB 1 →eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE A1 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
          
           
               
                 Message Type 
                 M 
                 9.2.13 
                 YES 
                 ignore 
               
               
                 Cell Information 
                 M 
                   
                 YES 
                 ignore 
               
             
          
           
               
                   
                 &gt;Cell Information 
                   
                 1 . . . 
                   
                   
                 EACH 
                 ignore 
               
               
                   
                 Item 
                   
                 &lt;maxCellineNB&gt; 
               
             
          
           
               
                   
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
                 Id of the 
                 — 
                 — 
               
             
          
           
               
                   
                 9.2.14 
                 source cell 
               
             
          
           
               
                   
                 &gt;&gt;UL 
                 O 
                   
                 9.2.17 
                   
                 — 
                 — 
               
               
                   
                 Interference 
                   
                   
                   
                   
                   
                   
               
               
                   
                 Overload 
                   
                   
                   
                   
                   
                   
               
               
                   
                 Indication 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;UL High 
                   
                 0 . . . 
                   
                   
                 — 
                 — 
               
               
                   
                 Interference 
                   
                 &lt;maxCellineNB&gt; 
               
               
                   
                 Information 
               
             
          
           
               
                   
                 &gt;&gt;&gt;Target Cell 
                 M 
                   
                 ECGI 
                 Id of the cell 
                 — 
                 — 
               
               
                   
                 ID 
                   
                   
                 9.2.14 
                 for which the 
               
             
          
           
               
                   
                 HII is meant 
               
             
          
           
               
                   
                 &gt;&gt;&gt;UL High 
                 M 
                   
                 9.2.18 
                   
                 — 
                 — 
               
               
                   
                 Interference 
               
               
                   
                 Indication 
               
             
          
           
               
                   
                 &gt;&gt;Relative 
                 O 
                   
                 9.2.19 
                   
                 — 
                 — 
               
               
                   
                 Narrowband Tx 
                   
                   
                   
                   
                   
                   
               
               
                   
                 Power (RNTP) 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;ABS 
                 O 
                   
                 9.2.54 
                   
                 YES 
                 ignore 
               
               
                   
                 Information 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;lnvoke 
                 O 
                   
                 9.2.55 
                   
                 YES 
                 ignore 
               
               
                   
                 Indication 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;Intended 
                 O 
                   
                 ENUMERATED 
                 One of the 
                 YES 
                 ignore 
               
               
                   
                 UL-DL 
                   
                   
                 (sa0, sa1, 
                 UL-DL 
               
               
                   
                 Configuration 
                   
                   
                 sa2, sa3, 
                 configurations 
               
             
          
           
               
                   
                 sa4, sa5, 
                 defined in 
               
               
                   
                 sa6, . . .) 
                 TS 36.211 
               
               
                   
                   
                 [10]. The UL 
               
               
                   
                   
                 subframe(s) 
               
               
                   
                   
                 in the 
               
               
                   
                   
                 indicated 
               
               
                   
                   
                 configuration 
               
               
                   
                   
                 is subset of 
               
               
                   
                   
                 those in 
               
               
                   
                   
                 SIB1 UL-DL 
               
               
                   
                   
                 configuration. 
               
               
                   
                   
                 This IE 
               
               
                   
                   
                 applies to 
               
               
                   
                   
                 TDD only. 
               
             
          
           
               
                   
                 &gt;&gt;Extended UL 
                 O 
                   
                 9.2.67 
                 This IE 
                 YES 
                 ignore 
               
               
                   
                 Interference 
                   
                   
                   
                 applies to 
                   
                   
               
               
                   
                 Overload Info 
                   
                   
                   
                 TDD only. 
                   
                   
               
               
                   
                 &gt;&gt;Enhanced 
                 O 
                   
                 9.2.x2 
                   
                 YES 
                 ignore 
               
               
                   
                 Relative 
               
               
                   
                 Narrowband Tx 
               
               
                   
                 Power (eRNTP) 
               
               
                   
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value is 256. 
               
               
                   
                   
               
             
          
         
       
     
         [0049]    9.1.2.11 RESOURCE STATUS REQUEST 
         [0050]    This message is sent by an eNB 1  to a neighbouring eNB 2  to initiate the requested measurement according to the parameters given in the message. 
         [0051]    Direction: eNB 1 →eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
               
               
               
             
               
               
             
           
               
                 TABLE A2 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 reject 
               
               
                 eNB1 Measurement 
                 M 
                   
                 INTEGER 
                 Allocated by eNB 1   
                 YES 
                 reject 
               
               
                 ID 
                   
                   
                 (1 . . . 4095, . . .) 
                   
                   
                   
               
               
                 eNB2 Measurement 
                 C- 
                   
                 INTEGER 
                 Allocated by eNB 2   
                 YES 
                 ignore 
               
               
                 ID 
                 ifRegistrationRequestStop 
                   
                 (1 . . . 4095, . . .) 
                   
                   
                   
               
               
                 Registration 
                 M 
                   
                 ENUMERATED 
                 A value set to 
                 YES 
                 reject 
               
               
                 Request 
                   
                   
                 (start, stop, . . .) 
                 “stop”, indicates a 
                   
                   
               
               
                   
                   
                   
                   
                 request to stop all 
                   
                   
               
               
                   
                   
                   
                   
                 cells 
                   
                   
               
               
                   
                   
                   
                   
                 measurements. 
                   
                   
               
               
                 Report 
                 O 
                   
                 BITSTRING 
                 Each position in 
                 YES 
                 reject 
               
               
                 Characteristics 
                   
                   
                 (SIZE(32)) 
                 the bitmap 
                   
                   
               
               
                   
                   
                   
                   
                 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 measurement 
                   
                   
               
               
                   
                   
                   
                   
                 object the eNB 2  is 
                   
                   
               
               
                   
                   
                   
                   
                 requested to 
                   
                   
               
               
                   
                   
                   
                   
                 report. 
                   
                   
               
               
                   
                   
                   
                   
                 First Bit = PRB 
                   
                   
               
               
                   
                   
                   
                   
                 Periodic, 
                   
                   
               
               
                   
                   
                   
                   
                 Second Bit = TNL 
                   
                   
               
               
                   
                   
                   
                   
                 load Ind Periodic, 
                   
                   
               
               
                   
                   
                   
                   
                 Third Bit = HW 
                   
                   
               
               
                   
                   
                   
                   
                 Load Ind Periodic, 
                   
                   
               
               
                   
                   
                   
                   
                 Fourth Bit = 
                   
                   
               
               
                   
                   
                   
                   
                 Composite 
                   
                   
               
               
                   
                   
                   
                   
                 Available Capacity 
                   
                   
               
               
                   
                   
                   
                   
                 Periodic, this bit 
                   
                   
               
               
                   
                   
                   
                   
                 should be set to 1 if 
                   
                   
               
               
                   
                   
                   
                   
                 at least one of the 
                   
                   
               
               
                   
                   
                   
                   
                 First, Second or 
                   
                   
               
               
                   
                   
                   
                   
                 Third bits is set to 
                   
                   
               
               
                   
                   
                   
                   
                 1, 
                   
                   
               
               
                   
                   
                   
                   
                 Fifth Bit = ABS 
                   
                   
               
               
                   
                   
                   
                   
                 Status Periodic, 
                   
                   
               
               
                   
                   
                   
                   
                 Xth Bit = UE-CSI 
                   
                   
               
               
                   
                   
                   
                   
                 Periodic. 
                   
                   
               
               
                   
                   
                   
                   
                 Other bits shall be 
                   
                   
               
               
                   
                   
                   
                   
                 ignored by the 
                   
                   
               
               
                   
                   
                   
                   
                 eNB 2 . 
                   
                   
               
               
                 Cell To Report 
                   
                 1 
                   
                 Cell ID list for 
                 YES 
                 ignore 
               
               
                   
                   
                   
                   
                 which 
               
               
                   
                   
                   
                   
                 measurement is 
               
               
                   
                   
                   
                   
                 needed 
               
             
          
           
               
                   
                 &gt;Cell To Report 
                   
                 1 . . . 
                   
                   
                 EACH 
                 ignore 
               
               
                   
                 Item 
                   
                 &lt;maxCellineNB&gt; 
               
             
          
           
               
                   
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
                   
                 — 
                 — 
               
             
          
           
               
                   
                   
                   
                 9.2.14 
                   
                   
                   
               
               
                 Reporting Periodicity 
                 O 
                   
                 ENUMERATED 
                   
                 YES 
                 ignore 
               
               
                   
                   
                   
                 (1000 ms, 2000 ms, 
                   
                   
                   
               
               
                   
                   
                   
                 5000 ms, 
                   
                   
                   
               
               
                   
                   
                   
                 10000 ms, . . .) 
                   
                   
                   
               
               
                 Partial Success 
                 O 
                   
                 ENUMERATED 
                 Included if partial 
                 YES 
                 ignore 
               
               
                 Indicator 
                   
                   
                 (partial 
                 success is allowed 
                   
                   
               
               
                   
                   
                   
                 success 
                   
                   
                   
               
               
                   
                   
                   
                 allowed, . . .) 
                   
                   
                   
               
               
                 CSI Measurement 
                 O 
                   
                 BITSTRING 
                 Each position in 
                 YES 
                 ignore 
               
               
                 Report type 
                   
                   
                 (SIZE(2)) 
                 the bitmap 
                   
                   
               
               
                   
                   
                   
                   
                 indicates the type 
                   
                   
               
               
                   
                   
                   
                   
                 of CSI 
                   
                   
               
               
                   
                   
                   
                   
                 measurement to 
                   
                   
               
               
                   
                   
                   
                   
                 report. 
                   
                   
               
               
                   
                   
                   
                   
                 First bit = Rank, 
                   
                   
               
               
                   
                   
                   
                   
                 Second 
                   
                   
               
               
                   
                   
                   
                   
                 bit = subband CQI. 
                   
                   
               
               
                 Reporting Periodicity 
                 O 
                   
                 ENUMERATED 
                 Periodicity for CSI 
                 YES 
                 ignore 
               
               
                 of CSI Measurement 
                   
                   
                 (5 ms, 10 ms, 
                 Measurement 
               
               
                 Report 
                   
                   
                 20 ms, 40 ms, 
                 Report Periodic 
               
               
                   
                   
                   
                 80 ms, 
               
               
                   
                   
                   
                 aperiodic, . . .) 
               
               
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value is 256. 
               
               
                   
                   
               
             
          
           
               
                 Condition 
                 Explanation 
               
               
                   
               
               
                 ifRegistrationRequestStop 
                 This IE shall be present if the Registration Request IE is set to the 
               
               
                   
                 value “stop”. 
               
               
                   
               
             
          
         
       
     
         [0052]    9.1.2.14 RESOURCE STATUS UPDATE 
         [0053]    This message is sent by eNB 2  to neighbouring eNB 1  to report the results of the requested measurements. 
         [0054]    Direction: eNB 2 →eNB 1 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE A3 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 ignore 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . .) 
                 eNB 1   
                   
                   
               
               
                 eNB2 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . .) 
                 eNB 2   
                   
                   
               
               
                 Cell Measurement 
                   
                 1 
                   
                   
                 YES 
                 ignore 
               
               
                 Result 
               
             
          
           
               
                   
                 &gt;Cell 
                   
                 1 . . . 
                   
                   
                 EACH 
                 ignore 
               
               
                   
                 Measurement 
                   
                 &lt;maxCellineNB&gt; 
               
               
                   
                 Result Item 
               
             
          
           
               
                   
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
               
             
          
           
               
                   
                 9.2.14 
               
             
          
           
               
                   
                 &gt;&gt;Hardware 
                 O 
                   
                 9.2.34 
                   
                   
                   
               
               
                   
                 Load Indicator 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;S1 TNL Load 
                 O 
                   
                 9.2.35 
                   
                   
                   
               
               
                   
                 Indicator 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;Radio 
                 O 
                   
                 9.2.37 
                   
                   
                   
               
               
                   
                 Resource Status 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;Composite 
                 O 
                   
                 9.2.44 
                   
                 YES 
                 ignore 
               
               
                   
                 Available 
                   
                   
                   
                   
                   
                   
               
               
                   
                 Capacity Group 
                   
                   
                   
                   
                   
                   
               
               
                   
                 &gt;&gt;ABS Status 
                 O 
                   
                 9.2.58 
                   
                 YES 
                 ignore 
               
               
                   
                 &gt;&gt; UE-CSI 
                 O 
                   
                 9.2.x1 
                   
                 YES 
                 ignore 
               
               
                   
                 Report 
               
               
                   
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value is 256. 
               
               
                   
                   
               
             
          
         
       
     
         [0055]    9.2.x1 UE-CSI Report 
         [0056]    This information element (IE) provides UE-CSI information for a subset or set of UEs served by eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE A4 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                   
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 Semantics description 
               
               
                   
               
               
                 UE subset CSI Report 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEsubsetCSIReport&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                 ID of the UE served by 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 the cell in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 INTEGER 
                 The rank indicator is 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                 present only if it is 
               
               
                   
                   
                   
                 or BIT STRING  
                 requested in the 
               
               
                   
                   
                   
                 (SIZE (3)) 
                 associated request. 
               
               
                   
                   
                   
                   
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 INTEGER 
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                   
                   
                   
                 or BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 INTEGER 
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                   
                   
                   
                 or BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Subband CQI For 
                   
                 0 . . .  
                   
                 0 indicates no subband 
               
               
                 Codeword 0 List or 
                   
                 &lt;maxCQISubbands &gt; 
                   
                 CQI, which is always 
               
               
                 Subband CQI List 
                   
                   
                   
                 chosen if associated 
               
               
                   
                   
                   
                   
                 request does not want 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER 
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                   
                   
                   
                 or BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (2)) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER 
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                   
                   
                   
                 or BIT STRING  
                   
               
               
                   
                   
                   
                 (SIZE (2)) 
                   
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                   
                 INTEGER  
                 CSI process 
               
               
                 Configuration information 
                   
                   
                 (0 . . . 31) 
                 configuration 
               
               
                   
                   
                   
                 or FFS 
                 information. 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEsubsetCSIReport 
                 Maximum UE subset size for which UE-CSI can be reported. 
               
               
                   
                 The value is 32. 
               
               
                 maxUE-CSIProcess 
                 Maximum number of CSI processes per-UE. The value is 4. 
               
               
                 maxCQISubbands 
                 Maximum number of subbands for UE CQI reporting.  
               
               
                   
                 The value is 28. 
               
               
                   
               
             
          
         
       
     
         [0057]    maxUEsubsetCSIReport can alternatively be set to 16, 20, 30, 35, or 40. 
         [0058]    9.2.x2 Enhanced Relative Narrowband Tx Power (E-RNTP) 
         [0059]    This IE (information element) provides an indication on DL power restriction per PRB (physical resource block) per subframe in a cell and other information needed by to a neighbour eNB for interference aware scheduling. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
               
               
             
               
               
               
             
           
               
                 TABLE A5 
               
               
                   
               
             
             
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 RNTP Per 
                 M 
                   
                 BIT 
                 Each position 
                 — 
                 — 
               
               
                 PRB 
                   
                   
                 STRING 
                 in the bitmap 
                   
                   
               
               
                   
                   
                   
                 (6 . . . 110, . . .) 
                 represents a 
                   
                   
               
               
                   
                   
                   
                   
                 n PRB  value 
                   
                   
               
               
                   
                   
                   
                   
                 (i.e. first 
                   
                   
               
               
                   
                   
                   
                   
                 bit = PRB 0 
                   
                   
               
               
                   
                   
                   
                   
                 and so on), 
                   
                   
               
               
                   
                   
                   
                   
                 for which the 
                   
                   
               
               
                   
                   
                   
                   
                 bit value 
                   
                   
               
               
                   
                   
                   
                   
                 represents 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP (n PRB ), 
                   
                   
               
               
                   
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.213 [11]. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 0 
                   
                   
               
               
                   
                   
                   
                   
                 indicates “Tx 
                   
                   
               
               
                   
                   
                   
                   
                 not 
                   
                   
               
               
                   
                   
                   
                   
                 exceeding 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 threshold”. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 1 
                   
                   
               
               
                   
                   
                   
                   
                 indicates “no 
                   
                   
               
               
                   
                   
                   
                   
                 promise on 
                   
                   
               
               
                   
                   
                   
                   
                 the Tx power 
                   
                   
               
               
                   
                   
                   
                   
                 is given”. 
                   
                   
               
               
                   
                   
                   
                   
                 This IE is 
                   
                   
               
               
                   
                   
                   
                   
                 used to 
                   
                   
               
               
                   
                   
                   
                   
                 indicate DL 
                   
                   
               
               
                   
                   
                   
                   
                 power 
                   
                   
               
               
                   
                   
                   
                   
                 restriction per 
                   
                   
               
               
                   
                   
                   
                   
                 PRB for the 
                   
                   
               
               
                   
                   
                   
                   
                 first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe. In 
                   
                   
               
               
                   
                   
                   
                   
                 case the DL 
                   
                   
               
               
                   
                   
                   
                   
                 power 
                   
                   
               
               
                   
                   
                   
                   
                 restriction is 
                   
                   
               
               
                   
                   
                   
                   
                 static, the 
                   
                   
               
               
                   
                   
                   
                   
                 indicated DL 
                   
                   
               
               
                   
                   
                   
                   
                 power 
                   
                   
               
               
                   
                   
                   
                   
                 restriction is 
                   
                   
               
               
                   
                   
                   
                   
                 maintained 
                   
                   
               
               
                   
                   
                   
                   
                 over the 
                   
                   
               
               
                   
                   
                   
                   
                 subsequent 
                   
                   
               
               
                   
                   
                   
                   
                 subframes. 
                   
                   
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold   
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, −11, 
                 is defined in 
                   
                   
               
               
                   
                   
                   
                 −10, −9, −8, 
                 TS 36.213 
                   
                   
               
               
                   
                   
                   
                 −7, −6, −5, −4, 
                 [11]. 
                   
                   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                   
                   
                   
               
               
                   
                   
                   
                 1, 2, 3, . . .) 
                   
                   
                   
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . .) 
                 antenna ports 
                   
                   
               
               
                 Antenna 
                   
                   
                   
                 for 
                   
                   
               
               
                 Ports 
                   
                   
                   
                 cell-specific 
                   
                   
               
               
                   
                   
                   
                   
                 reference 
                   
                   
               
               
                   
                   
                   
                   
                 signals) 
                   
                   
               
               
                   
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.211 [10] 
                   
                   
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . .) 
                 in TS 36.213 
                   
                   
               
               
                   
                   
                   
                   
                 [11]. 
                   
                   
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . .) 
                 Predicted 
               
               
                 Impact 
                   
                   
                   
                 Number Of 
               
               
                   
                   
                   
                   
                 Occupied 
               
               
                   
                   
                   
                   
                 PDCCH 
               
               
                   
                   
                   
                   
                 OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see 
               
               
                   
                   
                   
                   
                 TS 36.211 
               
               
                   
                   
                   
                   
                 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 
               
               
                   
                   
                   
                   
                 means “no 
               
               
                   
                   
                   
                   
                 prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 Starting 
                 M 
                   
                 INTEGER 
                 Number of 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . .) 
                 the first 
               
               
                   
                   
                   
                   
                 system frame 
               
               
                   
                   
                   
                   
                 from which 
               
               
                   
                   
                   
                   
                 the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE 
               
               
                   
                   
                   
                   
                 is valid. 
               
               
                 Starting 
                 M 
                   
                 INTEGER 
                 Index of the 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . .) 
                 first subframe 
               
               
                 Index 
                   
                   
                   
                 from which 
               
               
                   
                   
                   
                   
                 the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE 
               
               
                   
                   
                   
                   
                 is valid. 
               
               
                 RNTP List 
                 O 
                 2 . . . 
                   
                 The first item 
               
               
                   
                   
                 &lt;maxnoofSubframes&gt; 
                   
                 in the list 
               
               
                   
                   
                   
                   
                 corresponds 
               
               
                   
                   
                   
                   
                 to the second 
               
               
                   
                   
                   
                   
                 subframe, the 
               
               
                   
                   
                   
                   
                 second to the 
               
               
                   
                   
                   
                   
                 third 
               
               
                   
                   
                   
                   
                 subframe, 
               
               
                   
                   
                   
                   
                 and so on. 
               
               
                   
                   
                   
                   
                 The DL 
               
               
                   
                   
                   
                   
                 power 
               
               
                   
                   
                   
                   
                 restrictions 
               
               
                   
                   
                   
                   
                 conveyed for 
               
               
                   
                   
                   
                   
                 the first 
               
               
                   
                   
                   
                   
                 subframe and 
               
               
                   
                   
                   
                   
                 the ones 
               
               
                   
                   
                   
                   
                 conveyed for 
               
               
                   
                   
                   
                   
                 the 
               
               
                   
                   
                   
                   
                 subsequent 
               
               
                   
                   
                   
                   
                 subframes in 
               
               
                   
                   
                   
                   
                 the list, are 
               
               
                   
                   
                   
                   
                 together 
               
               
                   
                   
                   
                   
                 applied 
               
               
                   
                   
                   
                   
                 repeatedly. 
               
             
          
           
               
                   
                 &gt;RNTP 
                 M 
                   
                 BIT STRING 
                 Each position 
               
               
                   
                 Per PRB 
                   
                   
                 (6 . . . 110, . . .) 
                 in the bitmap 
               
               
                   
                 Subframe- 
                   
                   
                   
                 represents a 
               
               
                   
                 Specific 
                   
                   
                   
                 n PRB  value 
               
             
          
           
               
                   
                 (i.e. first 
               
               
                   
                 bit = PRB 0 
               
               
                   
                 and so on), 
               
               
                   
                 for which the 
               
               
                   
                 bit value 
               
               
                   
                 represents 
               
               
                   
                 RNTP (n PRB ), 
               
               
                   
                 defined in TS 
               
               
                   
                 36.213 [11]. 
               
               
                   
                 Value 0 
               
               
                   
                 indicates “Tx 
               
               
                   
                 not 
               
               
                   
                 exceeding 
               
               
                   
                 RNTP 
               
               
                   
                 threshold”. 
               
               
                   
                 Value 1 
               
               
                   
                 indicates “no 
               
               
                   
                 promise on 
               
               
                   
                 the Tx power 
               
               
                   
                 is given”. 
               
               
                   
                 This IE is 
               
               
                   
                 used to 
               
               
                   
                 indicate DL 
               
               
                   
                 power 
               
               
                   
                 restriction per 
               
               
                   
                 PRB for the 
               
               
                   
                 corresponding 
               
               
                   
                 subframe. 
               
               
                   
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxSubframe 
                 Maximum number of subframes. Value is 40. 
               
               
                   
                   
               
             
          
         
       
     
       Embodiment B 
     B1. Introduction 
       [0060]    In the following we provide our views on CSI and eRNTP exchange, as well as proposals containing the required message structures. 
       B2. Discussion 
       [0061]    B2.1 CSI Exchange: Configuring CSI Processes 
         [0062]    The concept of CSI processes was defined in Rel.11 to enable CSI feedback from a UE to its serving eNB. The CSI feedback is determined for each CSI process according to the serving TP and interference hypothesis configured in that process. Each CSI process that is configured for a UE, comprises a set of resource elements on which non-zero power CSI-RSs are sent and a channel estimate is obtained by that UE using observations received on those resource elements. 
         [0063]    In addition, a set of resource elements is also indicated by the CSI process (referred to as interference measurement resources (IMRs)) on which the UE estimates the covariance of the interference it observes. The channel and covariance estimates are together used by the UE to determine and send its feedback report corresponding to that CSI process. Multiple such CSI processes (up-to 4) can be configured for a UE, each process corresponding to a different choice of signal or interference hypothesis. Moreover, in the scenario in which fast switching of the serving TP is not possible, different CSI processes that are configured for any given UE typically correspond to different choices of interference hypothesis. 
         [0064]    Note from the brief discussion above that in the event the interference hypothesis of a configured CSI process presumes muting from a TP (that is a dominant interferer for the UE of interest) which is controlled by the neighboring eNB, coordination among the eNBs is required in order to ensure that the interference estimated by the UE on the constituent IMRs is consistent with the assumed hypothesis. Another similar event that requires coordination is if the non-zero power CSI-RSs indicated in the CSI process must be interference protected in order to ensure reliable channel estimation at the UE. In both these events, the dominant interferer that is controlled by the neighboring eNB must be muted on certain resource elements. Thus, a mechanism (with appropriate signaling) should be available to share the CSI-RS (comprising non-zero power CSI-RSs and IMRs) configurations between eNBs, which would facilitate configuration of CSI processes across multiple eNBs. 
         [0065]    Once the CSI processes are configured, the CSI exchanged among eNBs over the backhaul should include the respective CSI process configuration information, in order to convey the conditions under which the CSI was measured by the UE. This configuration information includes non-zero power CSI-RS information and IMR information (comprising the subframe indices and zero-power CSI-RS information). Since this configuration is anyway informed to the UE via RRC (or higher layer) signaling, the same information can be reused as a container to convey the configuration to the neighboring eNB. 
         [0066]    Another way of conveying this configuration information is through a look-up-table. A look-up-table mapping an index to one or more distinct applied CSI process configurations can be constructed for each eNB. Here, by an applied CSI process we mean a process that is used by at-least one UE served by that eNB to measure its CSI. Such a table can be exchanged among neighbors first and from then on the configuration information can be exchanged via indices. The total number of configurations in the table can be limited in order to limit signaling overhead. 
         [0067]    Suitable values for the number of configurations in this table are either  8  or  16  or  32 . 
         [0068]    B2.2 CSI Exchange: Contents 
         [0069]    One eNB can send CSI report pertaining to one or more of UEs to a neighboring eNB. For each UE, the CSI that the eNB sends to a neighbor can comprise: 
         [0070]    (i) CQI: up-to 2 CQIs, each including a wideband component and possible sub-band differential components 
         [0071]    (ii) RI (rank indicator): one wideband component 
         [0072]    We note that the PMI was excluded from the CSI exchange report [1]. The justification for this exclusion was to minimize the overhead and the fact that PMI can depend on fast changing channel information, thus reducing its utility over non ideal backhaul with a higher latency. However, in the absence of PMI the use of RI is limited. Indeed, any rank greater than 1 will convey only 2 CQI(s), one for each of the two codewords. No further information about the (average) spatial directions seen by that UE can be deduced by the eNB receiving the report. As a result, reporting the RI should be made optional. Moreover, the eNB requesting the CSI report should be able to specify whether or not it would like to receive RI reports. Similarly, the eNB requesting the CSI reports should be able to specify whether or not it requires subband specific CQI reports. This can be achieved by setting a bit (in the measurement request) to be 0 if rank is not requested and 1 otherwise. Another bit can be set to 0 if subband CQIs are not requested and 1 otherwise. 
         [0073]    Processing (filtering or subsampling) of the short-term CSI (received via over-the-air signaling) at an eNB prior to exchange should be permitted. 
         [0074]    One use case for this is when the periodicity of the CSI report that is requested by eNB 1  to its neighbor eNB 2 , is larger than the over-the-air CSI signaling periodicity configured by eNB 2 . In this case eNB 2  has to do some processing (such as subsampling or averaging) of the reports it receives before it sends it to eNB 1 . In this context, we note that the subsampling employed by eNB 2  should be understood by eNB 1  (if needed additional signaling can be added to ensure this). One possible way this can be accomplished (without any signaling overhead) is for eNB 2  to use the subsampling factor determined by a pre-determined rule (known to or configured for all eNBs in advance) that outputs a subsampling factor, given the requested periodicity and CSI process configuration as inputs. On the other hand, averaging or scaling or filtering employed by eNB 2  can be transparent to the receiving eNB 1 . 
         [0075]    One of the goals of CSI exchange is to facilitate centralized RRM [3]. In a scenario with centralized RRM, the central node receiving the CSI reports should be able to keep track of the CSI information received for each particular UE, over all the received CSI reports. This can be achieved by including a UE identifier in each CSI report for each UE whose CSI is conveyed in that report. We want to include a unique ID (identification or identifier) for each user so that the receiving node knows which ones among all the reports that it receives, belong that user. This will be useful for RRM. Otherwise the receiving eNB will regard each received report as belonging to a distinct user. This can lead to sub-optimal resource allocation. 
         [0076]    B2.3 eRNTP Exchange 
         [0077]    Our view on eRNTP exchange is captured in a corresponding proposal attached in the end of this embodiment. 
         [0078]    We note that the RNTP (i.e., downlink (DL) power restriction) for the first subframe is always conveyed. If no information about the DL power restriction on any subsequent subframe is conveyed, then the one conveyed for the first subframe can be assumed to remain static (i.e., applicable over subsequent subframes). 
         [0079]    We also present several variations, one of which includes the use of multiple thresholds 
       B3. Conclusion 
       [0080]    We discussed the necessary X2 message to support CSI and eRNTP exchange for inter-eNB CoMP and presented corresponding proposals. 
         [0081]    Proposals 
         [0082]    9.1.2.11 RESOURCE STATUS REQUEST 
         [0083]    This message is sent by an eNB 1  to a neighbouring eNB 2  to initiate the requested measurement according to the parameters given in the message. 
         [0084]    Direction: eNB 1 →eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE B1 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                   
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 reject 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 1   
               
               
                 eNB2 
                 C-ifRegistrationRequestStop 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 ignore 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 2   
               
               
                 Registration 
                 M 
                   
                 ENUMERATED 
                 A value set to 
                 YES 
                 reject 
               
               
                 Request 
                   
                   
                 (start, 
                 “stop”, 
               
               
                   
                   
                   
                 stop, . . . ) 
                 indicates a 
               
               
                   
                   
                   
                   
                 request to 
               
               
                   
                   
                   
                   
                 stop all cells 
               
               
                   
                   
                   
                   
                 measurements. 
               
               
                 Report 
                 O 
                   
                 BITSTRING 
                 Each position 
                 YES 
                 reject 
               
               
                 Characteristics 
                   
                   
                 (SIZE(32)) 
                 in the bitmap 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 object the 
               
               
                   
                   
                   
                   
                 eNB 2  is 
               
               
                   
                   
                   
                   
                 requested to 
               
               
                   
                   
                   
                   
                 report. 
               
               
                   
                   
                   
                   
                 First Bit = 
               
               
                   
                   
                   
                   
                 PRB 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Second Bit = 
               
               
                   
                   
                   
                   
                 TNL load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Third Bit = 
               
               
                   
                   
                   
                   
                 HW Load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Fourth Bit = 
               
               
                   
                   
                   
                   
                 Composite 
               
               
                   
                   
                   
                   
                 Available 
               
               
                   
                   
                   
                   
                 Capacity 
               
               
                   
                   
                   
                   
                 Periodic, this 
               
               
                   
                   
                   
                   
                 bit should be 
               
               
                   
                   
                   
                   
                 set to 1 if at 
               
               
                   
                   
                   
                   
                 least one of 
               
               
                   
                   
                   
                   
                 the First, 
               
               
                   
                   
                   
                   
                 Second or 
               
               
                   
                   
                   
                   
                 Third bits is 
               
               
                   
                   
                   
                   
                 set to 1, 
               
               
                   
                   
                   
                   
                 Fifth Bit = 
               
               
                   
                   
                   
                   
                 ABS Status 
               
               
                   
                   
                   
                   
                 Periodic, Xth 
               
               
                   
                   
                   
                   
                 Bit = UE-CSI 
               
               
                   
                   
                   
                   
                 Periodic. 
               
               
                   
                   
                   
                   
                 Other bits 
               
               
                   
                   
                   
                   
                 shall be 
               
               
                   
                   
                   
                   
                 ignored by 
               
               
                   
                   
                   
                   
                 the eNB 2 . 
               
               
                 Cell To Report 
                   
                 1 
                   
                 Cell ID list for 
                 YES 
                 ignore 
               
               
                   
                   
                   
                   
                 which 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 is needed 
               
               
                 &gt;Cell To 
                   
                 1 . . . &lt;maxCellineNB&gt; 
                   
                   
                 EACH 
                 ignore 
               
               
                 Report Item 
               
               
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
                   
                 — 
                 — 
               
               
                   
                   
                   
                 9.2.14 
               
               
                 Reporting 
                 O 
                   
                 ENUMERATED 
                   
                 YES 
                 ignore 
               
               
                 Periodicity 
                   
                   
                 (1000 ms, 
               
               
                   
                   
                   
                 2000 ms, 
               
               
                   
                   
                   
                 5000 ms, 
               
               
                   
                   
                   
                 10000 ms, . . . ) 
               
               
                 Partial Success 
                 O 
                   
                 ENUMERATED 
                 Included if 
                 YES 
                 ignore 
               
               
                 Indicator 
                   
                   
                 (partial 
                 partial 
               
               
                   
                   
                   
                 success 
                 success is 
               
               
                   
                   
                   
                 allowed, . . . ) 
                 allowed 
               
               
                 CSI 
                 O 
                   
                 BITSTRING 
                 Each position 
                 YES 
                 ignore 
               
               
                 Measurement 
                   
                   
                 (SIZE(2)) 
                 in the bitmap 
               
               
                 Report type 
                   
                   
                   
                 indicates the 
               
               
                   
                   
                   
                   
                 type of CSI 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 to report. 
               
               
                   
                   
                   
                   
                 First 
               
               
                   
                   
                   
                   
                 bit = Rank, 
               
               
                   
                   
                   
                   
                 Second 
               
               
                   
                   
                   
                   
                 bit = subband 
               
               
                   
                   
                   
                   
                 CQI. 
               
               
                 ((Reporting 
                 O 
                   
                 ENUMERATED 
                 Periodicity 
                 YES 
                 ignore 
               
               
                 Periodicity of CSI 
                   
                   
                 (5 ms, 
                 for CSI 
               
               
                 Measurement 
                   
                   
                 10 ms, 
                 Measurement 
               
               
                 Report 
                   
                   
                 20 ms, 40 ms, 
                 Report 
               
               
                   
                   
                   
                 80 ms, 
                 Periodic 
               
               
                   
                   
                   
                 aperiodic, . . . ) 
               
               
                   
               
             
          
           
               
                   
                   
                 Explanation 
               
               
                   
                   
               
               
                   
                 Range bound 
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value is 
               
               
                   
                   
                 256. 
               
               
                   
                 Condition 
               
               
                   
                 ifRegistrationRequestStop 
                 This IE shall be present if the Registration Request IE is 
               
               
                   
                   
                 set to the value “stop”. 
               
               
                   
                   
               
             
          
         
       
     
         [0085]    9.1.2.14 RESOURCE STATUS UPDATE 
         [0086]    This message is sent by eNB 2  to neighbouring eNB 1  to report the results of the requested measurements. 
         [0087]    Direction: eNB 2 →eNB 1 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE B2 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                   
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 ignore 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 1   
               
               
                 eNB2 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement ID 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 2   
               
               
                 Cell 
                   
                 1 
                   
                   
                 YES 
                 ignore 
               
               
                 Measurement 
               
               
                 Result 
               
               
                 &gt;Cell 
                   
                 1 . . . &lt;maxCelline NB&gt; 
                   
                   
                 EACH 
                 ignore 
               
               
                 Measurement 
               
               
                 Result Item 
               
               
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
               
               
                   
                   
                   
                 9.2.14 
               
               
                 &gt;&gt;Hardware 
                 O 
                   
                 9.2.34 
               
               
                 Load Indicator 
               
               
                 &gt;&gt;S1 TNL 
                 O 
                   
                 9.2.35 
               
               
                 Load Indicator 
               
               
                 &gt;&gt;Radio 
                 O 
                   
                 9.2.37 
               
               
                 Resource 
               
               
                 Status 
               
               
                 &gt;&gt;Composite 
                 O 
                   
                 9.2.44 
                   
                 YES 
                 ignore 
               
               
                 Available 
               
               
                 Capacity Group 
               
               
                 &gt;&gt;ABS Status 
                 O 
                   
                 9.2.58 
                   
                 YES 
                 ignore 
               
               
                 &gt;&gt; UE-CSI 
                 O 
                   
                 9.2.x1 
                   
                 YES 
                 ignore 
               
               
                 Report 
               
               
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value 
               
               
                   
                   
                 is 256. 
               
               
                   
                   
               
             
          
         
       
     
         [0088]    9.2.x1 UE-CSI Report 
         [0089]    This IE provides UE-CSI information for a set of UEs served by eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE B3 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 UE subset CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Report 
                   
                 &lt;maxUEsubsetCSIReport &gt; 
                   
                   
               
               
                 &gt;(C-RNTI) UE ID 
                 M 
                   
                 BIT STRING (SIZE 
                 ID of the UE served by 
               
               
                   
                   
                   
                 (16)) 
                 the cell in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSI 
                   
                   
               
               
                   
                   
                 process&gt; 
                   
                   
               
               
                 &gt;&gt;Rank 
                 O 
                   
                 BIT STRING (SIZE  
                 The rank indicator IE is 
               
               
                 Indicator 
                   
                   
                 (3)) 
                 present only if it is 
               
               
                   
                   
                   
                   
                 requested in the 
               
               
                   
                   
                   
                   
                 associated request. In 
               
               
                   
                   
                   
                   
                 that case Cf. TS 36.213 
               
               
                   
                   
                   
                   
                 [7.2.3]. 
               
               
                 &gt;&gt;Wideband 
                 M 
                   
                 BIT STRING (SIZE 
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 CQI For 
                   
                   
                 (4)) 
                   
               
               
                 Codeword 0 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband 
                 O 
                   
                 BIT STRING (SIZE  
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 CQI For 
                   
                   
                 (4)) 
                   
               
               
                 Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;&gt;Subband CQI 
                   
                 0 . . . &lt;maxCQI 
                   
                 0 indicates no subband 
               
               
                 List 
                   
                 Subbands&gt; 
                   
                 CQI, which is always 
               
               
                   
                   
                   
                   
                 chosen if associated 
               
               
                   
                   
                   
                   
                 request does not want 
               
               
                   
                   
                   
                   
                 subband CQI, or this IE 
               
               
                   
                   
                   
                   
                 is present only if 
               
               
                   
                   
                   
                   
                 associated request 
               
               
                   
                   
                   
                   
                 wants subband CQI 
               
               
                 &gt;&gt;&gt;Subband 
                 O 
                   
                 BIT STRING (SIZE  
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 CQI for 
                   
                   
                 (2)) 
                   
               
               
                 codeword 0 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband 
                 O 
                   
                 BIT STRING (SIZE  
                 Cf. TS 36.213 [7.2.3]. 
               
               
                 CQI for 
                   
                   
                 (2)) 
                   
               
               
                 codeword 1 
                   
                   
                   
                   
               
               
                 &gt;&gt;UE-CSI 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 process 
                   
                   
                   
                 configuration 
               
               
                 Configuration 
                   
                   
                   
                 information. 
               
               
                 information 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEsubsetCSIReport 
                 Maximum UE subset size for which UE-CSI can be reported. The value is 32. 
               
               
                 maxUE-CSIProcess 
                 Maximum number of CSI processes per-UE. The value is 4. 
               
               
                 maxCQISubbands 
                 Maximum number of subbands for UE CQI reporting. The value is 28. 
               
               
                   
               
             
          
         
       
     
         [0090]    Alternatively, the parameter maxUEsubsetCSIReport can be 8, 16, 32, 48, 64, or 256. Further, optionally, the UE-ID can have a more compact representation using say 8 bits or 6 bits or 5 bits (equivalently 256 or 64 or 32 possible indices from a configurable table). 
         [0091]    Next, we consider the case when subband indices have to be indicated. This is important to accommodate feedback modes that involve UE selected subband feedback. 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE B4 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 UE subset CSI Report 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEsubset 
                   
                   
               
               
                   
                   
                 CSIReport&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                 ID of the UE served by 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 the cell in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 BIT STRING 
                 The rank indicator IE is 
               
               
                   
                   
                   
                 (SIZE (3)) 
                 present only if it is 
               
               
                   
                   
                   
                   
                 requested in the 
               
               
                   
                   
                   
                   
                 associated request. In 
               
               
                   
                   
                   
                   
                 that case Cf. TS 
               
               
                   
                   
                   
                   
                 36.213 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 BIT STRING 
                   
               
               
                 Codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 BIT STRING 
                   
               
               
                 Codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . . &lt;maxCQISubbands&gt; 
                   
                 This IE is present only 
               
               
                   
                   
                   
                   
                 if associated request 
               
               
                   
                   
                   
                   
                 wants subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI 
                 O 
                   
                 BIT STRING 
                   
               
               
                 for codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI 
                 O 
                   
                 BIT STRING 
                   
               
               
                 for codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;Subband index 
                 O 
                   
                 INTEGER 
                 Included in case of UE 
               
               
                   
                   
                   
                 (0 . . . 27, . . . ) 
                 selected subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                 &gt;&gt;UE-CSI process  
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 Configuration 
                   
                   
                   
                 configuration 
               
               
                 information 
                   
                   
                   
                 information. 
               
               
                   
               
             
          
         
       
     
         [0092]    Note that as an alternative in the above tables, for each CQI the bit string field of 4 bits (2 bits) can be replaced by INTEGER (0 . . . 15, . . . ) (INTEGER (0 . . . 7, . . . )). 
         [0093]    In another alternative the sub band indices can be conveyed by means of a combinatorial index which is described next. 
         [0094]    The idea here is that depending on the number of PRBs (or RBs (resource blocks) for short) in the downlink available at sending eNB 2  (a parameter which is known or conveyed separately to the receiving eNB 1 ), the set of all possible subband selections that can be made together with the subband size, for all feedback modes, can be deduced by eNB 1 . 
         [0095]    For example when 110 RBs are available at eNB 2  (and this number is conveyed to eNB 1 ) eNB 1  can deduce that for a UE configured under: 
         [0096]    Aperiodic, Mode 2-*: 6 UE selected subband indices 
         [0097]    A subframe is composed of 28 subbands. Among 28 subbands, 6 subbands are selected by the UE. The number of PRBs in the subbands is 4 except for the last one; the number of PRBs in the last subband is 2 (4*27+2=110). 
         [0098]    For Aperiodic, Mode 3-*: 14 higher layer-configured sub bands 
         [0099]    A subframe is composed of 14 subbands. The number of PRBs in the subband is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0100]    For Periodic, Mode 2-*: 4 UE selected subband indices (with an additional constraint on choosing one sub band per bandwidth portion or part) 
         [0101]    A subframe is composed of 14 subbands. Among 14 subbands, 4 subbands are selected by the UE. The number of PRBs in the subbands is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0102]    Then, considering all possible feasible subband selections under all the aforementioned feedback modes, it is possible to assign a unique label to each distinct feasible selection of sub bands. All possible such labels together decide the range of a combinatorial index R. As a result, knowing the value of R the receiving eNB 1  can deduce the subband selection. The associated CQIs (one for each subband in the indicated selection) can be ordered in the increasing order of the frequency range represented by the indicated subbands. Each such CQI can be conveyed using full representation (i.e., using 16 possibilities) which can then be directly used by the receiving eNB 1 . 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE B5 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 UE subset CSI Report 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEsubsetCSIReport&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 
               
               
                   
                   
                   
                   
                 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 BIT STRING 
                 The rank indicator 
               
               
                   
                   
                   
                 (SIZE (3)) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in 
               
               
                   
                   
                   
                   
                 the associated 
               
               
                   
                   
                   
                   
                 request. In that 
               
               
                   
                   
                   
                   
                 case Cf. TS 36.213 
               
               
                   
                   
                   
                   
                 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 BIT STRING 
                   
               
               
                 Codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 BIT STRING 
                   
               
               
                 Codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;combinatorial 
                 O 
                   
                 Integer FFS 
                 This IE is present 
               
               
                 index 
                   
                   
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                 The number of 
               
               
                   
                   
                 &lt;maxCQISubbands &gt; 
                   
                 subbands in the list 
               
               
                   
                   
                   
                   
                 as well as their 
               
               
                   
                   
                   
                   
                 respective indices 
               
               
                   
                   
                   
                   
                 and sizes are 
               
               
                   
                   
                   
                   
                 deduced from the 
               
               
                   
                   
                   
                   
                 combinatorial index. 
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 M 
                   
                 BIT STRING 
                   
               
               
                 for codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 BIT STRING 
                   
               
               
                 for codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 Configuration 
                   
                   
                   
                 configuration 
               
               
                 information 
                   
                   
                   
                 information. 
               
               
                   
               
             
          
         
       
     
         [0103]    UE Configuration Independent Coding Structure 
         [0104]    A coding structure for signaling CSI over X2 in a UE-configuration independent way is shown in Table I1. In this structure, a subband is defined as a set of contiguous PRBs having the same CQI value. The subband partitioning is left to the sending eNB 2  implementation, and is not restricted by the UE&#39;s CSI reporting configuration. Each indicated CQI follows the definition of a 4 bit CQI (Cf. TS 36.213). This allows for the sending eNB 2  to process the CSI it receives from the UE in any manner as long as each indicated CQI is consistent with the basic CQI definition. The receiving eNB 1  can directly use these CQIs while being agnostic to how they were procured and processed by eNB 1 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
             
           
               
                 TABLE B6 
               
               
                   
               
               
                 UE configuration independent coding structure 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                   
                   
                 IE type and 
                   
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 Semantics description 
               
               
                   
               
               
                 CSI per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxnoofUE-CSI&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (16)) 
                   
               
               
                 &gt;CSI per Interference 
                   
                 1 . . . 
                   
                   
               
               
                 Hypotheses 
                   
                 &lt;maxnoofInterfer- 
                   
                   
               
               
                   
                   
                 enceHypothesis &gt; 
                   
                   
               
               
                 &gt;&gt;Interference Hypothesis 
                 M 
                   
                 [FFS] 
                   
               
               
                 Information 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 M 
                   
                 INTEGER 
                   
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 O 
                   
                 INTEGER 
                   
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;Rank Indication 
                 M 
                   
                 INTEGER 
                 Defined in TS 36.213 [11]. 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                   
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . . 
                   
                 Subbands are listed in the 
               
               
                   
                   
                 &lt;maxnoofSubband&gt; 
                   
                 order of increasing 
               
               
                   
                   
                   
                   
                 frequency. 
               
               
                 &gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER 
                 PRB number of the first 
               
               
                   
                   
                   
                 (0 . . . 109, . . . ) 
                 PRB in the subband. If this 
               
               
                   
                   
                   
                   
                 IE is not present, the 
               
               
                   
                   
                   
                   
                 subband is contiguous with 
               
               
                   
                   
                   
                   
                 the previous subband in the 
               
               
                   
                   
                   
                   
                 list, or starts with PRB 0 if 
               
               
                   
                   
                   
                   
                 this is the first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 O 
                   
                 INTEGER 
                 Number of contiguous 
               
               
                   
                   
                   
                 (1 . . . 110, . . . ) 
                 PRBs in the subband. If this 
               
               
                   
                   
                   
                   
                 IE is not present, the value 
               
               
                   
                   
                   
                   
                 is the same as the previous 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 M 
                   
                 INTEGER 
                   
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER 
                   
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxnoofUE-CSI 
                 Maximum number of UE-specific CSI reports. Value is 128 or  
               
               
                   
                 64 or 32 
               
               
                 maxnoofInterferenceHypotheses 
                 Maximum number of Interference Hypotheses. Value is 4. 
               
               
                 maxnoofSubband 
                 Maximum number of Subbands. Value is 28. 
               
               
                   
               
             
          
         
       
     
         [0105]    We note here that reporting full (complete) CQI (with 16 possibilities) for each indicated subband CQI instead of differential CQI is useful since otherwise the receiving eNB 1  may not know how to combine a corresponding wideband CQI and differential sub-band CQI (with fewer than 16 possibilities) in order to obtain the full CQI for that subband, for instance, in the case that the precise feedback mode configured for the UE of interest under that CSI process is not conveyed to the receiving eNB 1 . We note here also that it might be desirable to not impose restrictions on sending eNB 2  on how it combines reports from multiple different feedback modes configured for that UE under the same CSI process. Then, note that when aperiodic feedback mode 3-1 is configured for the UE (by eNB 2 ), the UE reported sub band CQI is encoded differentially with respect to the corresponding wideband CQI using 2 bits representing differential values {−2, 0, 1, 2}. On the other hand, in the case of aperiodic feedback mode 2-0 or 2-2, only the best M-average is reported by the UE by differentially encoding it with respect to a corresponding wideband CQI using 2 bits representing differential values {1, 2, 3, 4}. Further, in case of periodic feedback mode 2-1 the CQI corresponding to codeword-1 for each UE selected subband within a bandwidth part can itself be of 4 bits, whereas that of codeword-2 (when RI&gt;1) is differentially encoded with respect to CQI of codeword-1 using 3 bits. 
         [0106]    It becomes apparent from the above discussion that a transparent way of conveying CQI (without having to convey all details regarding to one or more feedback modes configured under that CSI process for that UE) is to allow for full (complete) CQI for each indicated subband. 
         [0107]    Another issue that is important, is to ensure that the RI and CQIs conveyed by eNB 2  to eNB 1  in a UE CSI report are mutually consistent, i.e., all the reported CQIs are computed by the UE for the same RI (which is identical to the one in the Rank Indication IE when the latter is present). This issue is important to address because under certain feedback modes (such as periodic mode 2-1) the RI and the wideband CQI(s) as well as the subband CQI(s) for one or more bandwidth portions can be reported by the UE on different subframes. Thus, depending on the periodicity defined by eNB 1  in its CSI request, it can happen that the latest RI available for the UE under the CSI process, can be different from the one for which the most recent CQI(s) are computed. In such a case, the sending eNB 2  should ensure that its CSI report is consistent, for instance by using the RI value for which the most recently available CQI(s) have been computed. 
         [0108]    The variation (which allows the requesting eNB to specify whether or not it wants to receive subband CQI(s) or Rank Indication is provided below. In this context, we note that since the requesting eNB 1  has no control over how eNB 2  configures CSI processes (and constituent feedback modes) for its users, it should be in any case able to exploit different type of CSI reports (wideband only or wideband and subband). 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE B7 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                   
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 Semantics description 
               
               
                   
               
             
             
               
                 CSI per UE 
                   
                 1 . . . 
                   
                   
               
               
                   
                   
                 &lt;maxnoofUE-CSI&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (16)) 
                   
               
               
                 &gt;CSI per Interference 
                   
                 1 . . . 
                   
                   
               
               
                 Hypotheses 
                   
                 &lt;maxnoofInterference- 
                   
                   
               
               
                   
                   
                 Hypothesis &gt; 
                   
                   
               
               
                 &gt;&gt;Interference 
                 M 
                   
                 [FFS] 
                   
               
               
                 Hypothesis Information 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 M 
                   
                 INTEGER 
                   
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 O 
                   
                 INTEGER 
                   
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;Rank Indication 
                 O 
                   
                 INTEGER 
                 The rank indication IE is 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                 present only if it is 
               
               
                   
                   
                   
                   
                 requested in the 
               
               
                   
                   
                   
                   
                 associated request. In 
               
               
                   
                   
                   
                   
                 that case it follows the 
               
               
                   
                   
                   
                   
                 definition in TS 36.213 
               
               
                   
                   
                   
                   
                 [11]. 
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . . 
                   
                 This IE is present only if 
               
               
                   
                   
                 &lt;maxnoofSubband&gt; 
                   
                 associated request 
               
               
                   
                   
                   
                   
                 wants subband CQI. In 
               
               
                   
                   
                   
                   
                 that case subbands are 
               
               
                   
                   
                   
                   
                 listed in the order of 
               
               
                   
                   
                   
                   
                 increasing frequency. 
               
               
                 &gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER 
                 PRB number of the first 
               
               
                   
                   
                   
                 (0 . . . 109, . . . ) 
                 PRB in the subband. If 
               
               
                   
                   
                   
                   
                 this IE is not present, 
               
               
                   
                   
                   
                   
                 the subband is 
               
               
                   
                   
                   
                   
                 contiguous with the 
               
               
                   
                   
                   
                   
                 previous subband in the 
               
               
                   
                   
                   
                   
                 list, or starts with PRB 0 
               
               
                   
                   
                   
                   
                 if this is the first 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 O 
                   
                 INTEGER 
                 Number of contiguous 
               
               
                   
                   
                   
                 (1 . . . 110, . . . ) 
                 PRBs in the subband. If 
               
               
                   
                   
                   
                   
                 this IE is not present, 
               
               
                   
                   
                   
                   
                 the value is the same as 
               
               
                   
                   
                   
                   
                 the previous subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 M 
                   
                 INTEGER 
                   
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER 
                   
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
               
               
                   
               
             
          
         
       
     
         [0109]    Another variation which allows for further simplification at the expense of not being bit efficient is as follows. Here the full CQIs for all possible subbands (which can be determined by the number of PRBs in the downlink available at eNB 2 ) are always conveyed for a UE under the CSI process. In case the sub band CQI is not reported by a UE under the configured feedback mode for a subband, the sending eNB 2  simply uses the corresponding wideband CQI value for that subband. Then, note that there is no need to include the wideband CQI(s) in case the associated request wants subband CQI. 
         [0110]    9.2.19 Relative Narrowband Tx Power (RNTP) 
         [0111]    This IE provides an indication on DL power restriction per PRB in a cell and other information needed by a neighbour eNB for interference aware scheduling. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE B8 
               
               
                   
               
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP Per 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB 
                   
                   
                 STRING 
                 the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a n PRB   
               
               
                   
                   
                   
                   
                 value (i.e. first 
               
               
                   
                   
                   
                   
                 bit = PRB 0 and so 
               
               
                   
                   
                   
                   
                 on), for which the 
               
               
                   
                   
                   
                   
                 bit value 
               
               
                   
                   
                   
                   
                 represents RNTP 
               
               
                   
                   
                   
                   
                 (n PRB ), defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 indicates 
               
               
                   
                   
                   
                   
                 “Tx not exceeding 
               
               
                   
                   
                   
                   
                 RNTP threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 indicates 
               
               
                   
                   
                   
                   
                 “no promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. 
               
               
                   
                   
                   
                   
                 This IE is used to 
               
               
                   
                   
                   
                   
                 indicate DL power 
               
               
                   
                   
                   
                   
                 restriction per 
               
               
                   
                   
                   
                   
                 PRB for the first 
               
               
                   
                   
                   
                   
                 subframe. In case 
               
               
                   
                   
                   
                   
                 the DL power 
               
               
                   
                   
                   
                   
                 restriction is static, 
               
               
                   
                   
                   
                   
                 the indicated DL 
               
               
                   
                   
                   
                   
                 power restriction 
               
               
                   
                   
                   
                   
                 is maintained over 
               
               
                   
                   
                   
                   
                 the subsequent 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, 
                 defined in TS 
               
               
                   
                   
                   
                 −11, −10, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −9, −8, −7, 
               
               
                   
                   
                   
                 −6, −5, −4, 
               
               
                   
                   
                   
                 −3, −2, −1, 
               
               
                   
                   
                   
                 0, 1, 2, 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 
                 antenna ports for 
               
               
                 Antenna 
                   
                   
                 2, 4, . . . ) 
                 cell-specific 
               
               
                 Ports 
                   
                   
                   
                 reference signals) 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in TS 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted Number 
               
               
                 Impact 
                   
                   
                   
                 Of Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see TS 
               
               
                   
                   
                   
                   
                 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means 
               
               
                   
                   
                   
                   
                 “no prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 Extended 
                 M or O 
                   
                 BIT 
                 Each position in 
               
               
                 RNTP Per 
                   
                   
                 STRING 
                 the bitmap 
               
               
                 PRB 
                   
                   
                 (6 . . . 4290, . . . ) 
                 represents a PRB 
               
               
                   
                   
                   
                   
                 in a subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 ‘interference 
               
               
                   
                   
                   
                   
                 protected 
               
               
                   
                   
                   
                   
                 resource’ or ‘no 
               
               
                   
                   
                   
                   
                 promise on the Tx 
               
               
                   
                   
                   
                   
                 power is given’ 
               
               
                   
                   
                   
                   
                 and value “0” 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 ‘resource with no 
               
               
                   
                   
                   
                   
                 utilization 
               
               
                   
                   
                   
                   
                 constraints’ or ‘Tx 
               
               
                   
                   
                   
                   
                 not exceeding 
               
               
                   
                   
                   
                   
                 RNTP threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the 
               
               
                   
                   
                   
                   
                 second or first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, the second 
               
               
                   
                   
                   
                   
                 bit corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the 
               
               
                   
                   
                   
                   
                 second or first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, and so on. 
               
               
                   
                   
                   
                   
                 The length of the 
               
               
                   
                   
                   
                   
                 bit string is an 
               
               
                   
                   
                   
                   
                 integer (maximum 
               
               
                   
                   
                   
                   
                 39) multiple of 
               
               
                   
                   
                   
                   
                 N RB   DL . N RB   DL  is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string may 
               
               
                   
                   
                   
                   
                 span across 
               
               
                   
                   
                   
                   
                 multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern 
               
               
                   
                   
                   
                   
                 across contiguous 
               
               
                   
                   
                   
                   
                 subframes 
               
               
                   
                   
                   
                   
                 (formed by RNTP 
               
               
                   
                   
                   
                   
                 per PRB and 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB) is 
               
               
                   
                   
                   
                   
                 continuously 
               
               
                   
                   
                   
                   
                 repeated. 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB start 
               
               
                 time 
               
               
                 &gt;Starting 
                 M or O 
                   
                 INTEGER 
                 Number of the first 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . . ) 
                 system frame from 
               
               
                   
                   
                   
                   
                 which the RNTP Per 
               
               
                   
                   
                   
                   
                 PRB (Per Subframe) 
               
               
                   
                   
                   
                   
                 IE is valid or SFN 
               
               
                   
                   
                   
                   
                 of the radio frame 
               
               
                   
                   
                   
                   
                 containing the first 
               
               
                   
                   
                   
                   
                 subframe when the 
               
               
                   
                   
                   
                   
                 RNTP Per PRB IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M or O 
                   
                 INTEGER 
                 Index of the first 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 subframe from 
               
               
                 Index 
                   
                   
                   
                 which the RNTP Per 
               
               
                   
                   
                   
                   
                 PRB (Per Subframe) 
               
               
                   
                   
                   
                   
                 IE is valid or 
               
               
                   
                   
                   
                   
                 Subframe number, 
               
               
                   
                   
                   
                   
                 within the radio 
               
               
                   
                   
                   
                   
                 frame indicated by 
               
               
                   
                   
                   
                   
                 the Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP Per 
               
               
                   
                   
                   
                   
                 PRB IE is valid. 
               
               
                   
               
             
          
         
       
     
         [0112]    An alternate Table for RNTP enhancement is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE B9 
               
               
                   
               
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP per 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB 
                   
                   
                 STRING 
                 the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a n PRB   
               
               
                   
                   
                   
                   
                 value (i.e. first 
               
               
                   
                   
                   
                   
                 bit = PRB 0 and so 
               
               
                   
                   
                   
                   
                 on), for which the 
               
               
                   
                   
                   
                   
                 bit value 
               
               
                   
                   
                   
                   
                 represents RNTP 
               
               
                   
                   
                   
                   
                 (n PRB ), defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 indicates 
               
               
                   
                   
                   
                   
                 “Tx not exceeding 
               
               
                   
                   
                   
                   
                 RNTP threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 indicates 
               
               
                   
                   
                   
                   
                 “no promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. 
               
               
                   
                   
                   
                   
                 This IE is ignored 
               
               
                   
                   
                   
                   
                 if the RNTP per 
               
               
                   
                   
                   
                   
                 PRB per subframe 
               
               
                   
                   
                   
                   
                 IE is present. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, −11, 
                 defined in TS 
               
               
                   
                   
                   
                 −10, −9, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −8, −7, −6, 
               
               
                   
                   
                   
                 −5, −4, −3, 
               
               
                   
                   
                   
                 −2, −1, 0, 
               
               
                   
                   
                   
                 1, 2, 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports for 
               
               
                 Antenna 
                   
                   
                   
                 cell-specific 
               
               
                 Ports 
                   
                   
                   
                 reference signals) 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in TS 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted Number 
               
               
                 Impact 
                   
                   
                   
                 Of Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see TS 
               
               
                   
                   
                   
                   
                 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means 
               
               
                   
                   
                   
                   
                 “no prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 RNTP Per 
                 O 
                   
                 BIT 
                 Each position in 
               
               
                 PRB per 
                   
                   
                 STRING 
                 the bitmap 
               
               
                 subframe 
                   
                   
                 (6 . . . 4400, . . . ) 
                 represents a PRB 
               
               
                   
                   
                   
                   
                 in a subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates ‘no 
               
               
                   
                   
                   
                   
                 promise on the Tx 
               
               
                   
                   
                   
                   
                 power is given’ 
               
               
                   
                   
                   
                   
                 and value “0” 
               
               
                   
                   
                   
                   
                 indicates ‘Tx not 
               
               
                   
                   
                   
                   
                 exceeding RNTP 
               
               
                   
                   
                   
                   
                 threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the RNTP 
               
               
                   
                   
                   
                   
                 per PRB per 
               
               
                   
                   
                   
                   
                 subframe IE is 
               
               
                   
                   
                   
                   
                 valid, the second 
               
               
                   
                   
                   
                   
                 bit corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the RNTP 
               
               
                   
                   
                   
                   
                 per PRB per 
               
               
                   
                   
                   
                   
                 subframe IE is 
               
               
                   
                   
                   
                   
                 valid, and so on. 
               
               
                   
                   
                   
                   
                 The length of the 
               
               
                   
                   
                   
                   
                 bit string is an 
               
               
                   
                   
                   
                   
                 integer (maximum 
               
               
                   
                   
                   
                   
                 40) multiple of 
               
               
                   
                   
                   
                   
                 N RB   DL . N RB   DL  is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string may 
               
               
                   
                   
                   
                   
                 span across 
               
               
                   
                   
                   
                   
                 multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern 
               
               
                   
                   
                   
                   
                 across contiguous 
               
               
                   
                   
                   
                   
                 subframes formed 
               
               
                   
                   
                   
                   
                 by RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE is 
               
               
                   
                   
                   
                   
                 continuously 
               
               
                   
                   
                   
                   
                 repeated. 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB per 
               
               
                 subframe 
               
               
                 start time 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . . ) 
                 frame containing the 
               
               
                   
                   
                   
                   
                 first subframe when 
               
               
                   
                   
                   
                   
                 the RNTP Per PRB 
               
               
                   
                   
                   
                   
                 Per Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe number, 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 within the radio 
               
               
                 Index 
                   
                   
                   
                 frame indicated by 
               
               
                   
                   
                   
                   
                 the Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP Per 
               
               
                   
                   
                   
                   
                 PRB Per Subframe 
               
               
                   
                   
                   
                   
                 IE is valid. 
               
               
                   
               
             
          
         
       
     
         [0113]    Another alternate Table for RNTP enhancement is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE B10 
               
               
                   
               
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP per 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB 
                   
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                   
                   
                   
                 (6 . . . 110, . . .) 
                 represents a n PRB   
                   
                   
               
               
                   
                   
                   
                   
                 value (i.e. first 
                   
                   
               
               
                   
                   
                   
                   
                 bit = PRB 0 and so 
                   
                   
               
               
                   
                   
                   
                   
                 on), for which the 
                   
                   
               
               
                   
                   
                   
                   
                 bit value 
                   
                   
               
               
                   
                   
                   
                   
                 represents RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 (n PRB ), defined in 
                   
                   
               
               
                   
                   
                   
                   
                 TS 36.213 [11]. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 0 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 “Tx not exceeding 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP threshold”. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 1 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 “no promise on the 
                   
                   
               
               
                   
                   
                   
                   
                 Tx power is 
                   
                   
               
               
                   
                   
                   
                   
                 given”. 
                   
                   
               
               
                   
                   
                   
                   
                 This IE is ignored 
                   
                   
               
               
                   
                   
                   
                   
                 if the RNTP per 
                   
                   
               
               
                   
                   
                   
                   
                 PRB per subframe 
                   
                   
               
               
                   
                   
                   
                   
                 IE is present. 
                   
                   
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, −11, 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 −10, −9, −8, 
                 36.213 [11]. 
                   
                   
               
               
                   
                   
                   
                 −7, −6, −5, −4, 
                   
                   
                   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                   
                   
                   
               
               
                   
                   
                   
                 1, 2, 3, . . .) 
                   
                   
                   
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . .) 
                 antenna ports for 
                   
                   
               
               
                 Antenna 
                   
                   
                   
                 cell-specific 
                   
                   
               
               
                 Ports 
                   
                   
                   
                 reference signals) 
                   
                   
               
               
                   
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.211 [10] 
                   
                   
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in TS 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . .) 
                 36.213 [11]. 
                   
                   
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . .) 
                 Predicted Number 
                   
                   
               
               
                 Impact 
                   
                   
                   
                 Of Occupied 
                   
                   
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
                   
                   
               
               
                   
                   
                   
                   
                 Symbols (see TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.211 [10]). 
                   
                   
               
               
                   
                   
                   
                   
                 Value 0 means 
                   
                   
               
               
                   
                   
                   
                   
                 “no prediction is 
                   
                   
               
               
                   
                   
                   
                   
                 available”. 
                   
                   
               
               
                 RNTP Per 
                 O 
                   
                 BIT 
                 Each position in 
                   
                   
               
               
                 PRB per 
                   
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                 subframe 
                   
                   
                 (6 . . . 4400, . . .) 
                 represents a PRB 
                   
                   
               
               
                   
                   
                   
                   
                 in a subframe, for 
                   
                   
               
               
                   
                   
                   
                   
                 which value “1” 
                   
                   
               
               
                   
                   
                   
                   
                 indicates ‘resource 
                   
                   
               
               
                   
                   
                   
                   
                 with no utilization 
                   
                   
               
               
                   
                   
                   
                   
                 constraints’ and 
                   
                   
               
               
                   
                   
                   
                   
                 value “0” indicates 
                   
                   
               
               
                   
                   
                   
                   
                 ‘interference 
                   
                   
               
               
                   
                   
                   
                   
                 protected resource.’ 
                   
                   
               
               
                   
                   
                   
                   
                 The first bit 
                   
                   
               
               
                   
                   
                   
                   
                 corresponds to 
                   
                   
               
               
                   
                   
                   
                   
                 PRB 0 of the first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe for 
                   
                   
               
               
                   
                   
                   
                   
                 which the RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 per PRB per 
                   
                   
               
               
                   
                   
                   
                   
                 subframe IE is 
                   
                   
               
               
                   
                   
                   
                   
                 valid, the second 
                   
                   
               
               
                   
                   
                   
                   
                 bit corresponds to 
                   
                   
               
               
                   
                   
                   
                   
                 PRB 1 of the first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe for 
                   
                   
               
               
                   
                   
                   
                   
                 which the RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 per PRB per 
                   
                   
               
               
                   
                   
                   
                   
                 subframe IE is 
                   
                   
               
               
                   
                   
                   
                   
                 valid, and so on. 
                   
                   
               
               
                   
                   
                   
                   
                 The length of the 
                   
                   
               
               
                   
                   
                   
                   
                 bit string is an 
                   
                   
               
               
                   
                   
                   
                   
                 integer (maximum 
                   
                   
               
               
                   
                   
                   
                   
                 40) multiple of 
                   
                   
               
               
                   
                   
                   
                   
                 N RB   DL . N RB   DL  is 
                   
                   
               
               
                   
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.211 [10]. 
                   
                   
               
               
                   
                   
                   
                   
                 The bit string may 
                   
                   
               
               
                   
                   
                   
                   
                 span across 
                   
                   
               
               
                   
                   
                   
                   
                 multiple 
                   
                   
               
               
                   
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                   
                 subframes. 
                   
                   
               
               
                   
                   
                   
                   
                 The pattern 
                   
                   
               
               
                   
                   
                   
                   
                 across contiguous 
                   
                   
               
               
                   
                   
                   
                   
                 subframes formed 
                   
                   
               
               
                   
                   
                   
                   
                 by RNTP per PRB 
                   
                   
               
               
                   
                   
                   
                   
                 per subframe IE is 
                   
                   
               
               
                   
                   
                   
                   
                 continuously 
                   
                   
               
               
                   
                   
                   
                   
                 repeated. 
                   
                   
               
               
                 RNTP per 
                   
                 0 . . . 1 
                   
                   
                   
                   
               
               
                 PRB per 
                   
                   
                   
                   
                   
                   
               
               
                 subframe 
                   
                   
                   
                   
                   
                   
               
               
                 start time 
                   
                   
                   
                   
                   
                   
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
                   
                   
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . .) 
                 frame containing the 
                   
                   
               
               
                   
                   
                   
                   
                 first subframe when 
                   
                   
               
               
                   
                   
                   
                   
                 the RNTP Per PRB 
                   
                   
               
               
                   
                   
                   
                   
                 Per Subframe IE is 
                   
                   
               
               
                   
                   
                   
                   
                 valid. 
                   
                   
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe number, 
                   
                   
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . .) 
                 within the radio 
                   
                   
               
               
                 Index 
                   
                   
                   
                 frame indicated by 
                   
                   
               
               
                   
                   
                   
                   
                 the Start SFN IE, of 
                   
                   
               
               
                   
                   
                   
                   
                 the first subframe 
                   
                   
               
               
                   
                   
                   
                   
                 when the RNTP Per 
                   
                   
               
               
                   
                   
                   
                   
                 PRB Per Subframe 
                   
                   
               
               
                   
                   
                   
                   
                 IE is valid. 
               
               
                   
               
             
          
         
       
     
         [0114]    Another alternative using multiple thresholds conveyed via 2 bits is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE B11 
               
               
                   
               
               
                   
                   
                   
                 IE type 
                   
                   
                   
               
               
                 IE/Group 
                   
                   
                 and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 ERNTP Per 
                 M 
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB and 
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                 subframe 
                   
                 (12 . . . 220, . . .) 
                 represents a PRB 
                   
                   
               
               
                   
                   
                   
                 in a subframe, for 
                   
                   
               
               
                   
                   
                   
                 which the value 
                   
                   
               
               
                   
                   
                   
                 “xx” indicates how 
                   
                   
               
               
                   
                   
                   
                 the transmission 
                   
                   
               
               
                   
                   
                   
                 power in a 
                   
                   
               
               
                   
                   
                   
                 resource block is 
                   
                   
               
               
                   
                   
                   
                 mapped relative to 
                   
                   
               
               
                   
                   
                   
                 the two power 
                   
                   
               
               
                   
                   
                   
                 thresholds: 
                   
                   
               
               
                   
                   
                   
                 00 - power level 
                   
                   
               
               
                   
                   
                   
                 not exceeding the 
                   
                   
               
               
                   
                   
                   
                 LPTH 
                   
                   
               
               
                   
                   
                   
                 01 - power level 
                   
                   
               
               
                   
                   
                   
                 between LPTH 
                   
                   
               
               
                   
                   
                   
                 and MPTH; 
                   
                   
               
               
                   
                   
                   
                 10 - power level 
                   
                   
               
               
                   
                   
                   
                 between MPTH 
                   
                   
               
               
                   
                   
                   
                 and HPTH; 
                   
                   
               
               
                   
                   
                   
                 11 - no promise 
                   
                   
               
               
                   
                   
                   
                 on the Tx power is 
                   
                   
               
               
                   
                   
                   
                 given. 
                   
                   
               
               
                   
                   
                   
                 The first 2 bits 
                   
                   
               
               
                   
                   
                   
                 correspond to 
                   
                   
               
               
                   
                   
                   
                 PRB 0 of the first 
                   
                   
               
               
                   
                   
                   
                 subframe for 
                   
                   
               
               
                   
                   
                   
                 which the IE is 
                   
                   
               
               
                   
                   
                   
                 valid, the following 
                   
                   
               
               
                   
                   
                   
                 2 bits correspond 
                   
                   
               
               
                   
                   
                   
                 to PRB 1 of the 
                   
                   
               
               
                   
                   
                   
                 first subframe for 
                   
                   
               
               
                   
                   
                   
                 which the IE is 
                   
                   
               
               
                   
                   
                   
                 valid, and so on. 
                   
                   
               
               
                   
                   
                   
                 The bit string may 
                   
                   
               
               
                   
                   
                   
                 span across 
                   
                   
               
               
                   
                   
                   
                 multiple 
                   
                   
               
               
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                 subframes. 
                   
                   
               
               
                   
                   
                   
                 The length of the 
                   
                   
               
               
                   
                   
                   
                 bit string is an 
                   
                   
               
               
                   
                   
                   
                 integer (maximum 
                   
                   
               
               
                   
                   
                   
                 40) multiple of 
                   
                   
               
               
                   
                   
                   
                 N RB   DL . The 
                   
                   
               
               
                   
                   
                   
                 parameter is 
                   
                   
               
               
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.211 [10]. 
                   
                   
               
               
                   
                   
                   
                 The ERNTP 
                   
                   
               
               
                   
                   
                   
                 pattern is 
                   
                   
               
               
                   
                   
                   
                 continuously 
                   
                   
               
               
                   
                   
                   
                 repeated with a 
                   
                   
               
               
                   
                   
                   
                 periodicity 
                   
                   
               
               
                   
                   
                   
                 indicated in 
                   
                   
               
               
                   
                   
                   
                 Periodicity. 
                   
                   
               
               
                 Transmitted 
                   
                   
                   
                   
                   
               
               
                 power levels 
                   
                   
                   
                   
                   
               
               
                 LPTH (Low 
                 M 
                 ENUMERATED 
                 Lower RNTP 
                 — 
                 — 
               
               
                 Power 
                   
                 (−∞, −11, 
                 power threshold, 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 using the 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 36.213 [11]. 
                   
                   
               
               
                 MPTH 
                 M 
                 ENUMERATED 
                 Medium RNTP 
                   
                   
               
               
                 (Medium 
                   
                 (−∞, −11, 
                 power threshold, 
                   
                   
               
               
                 Power 
                   
                 −10, −9, −8, 
                 using the 
                   
                   
               
               
                 Threshold) 
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 36.213 [11]. 
                   
                   
               
               
                 HPTH (High 
                 M 
                 ENUMERATED 
                 Higher RNTP 
                   
                   
               
               
                 Power 
                   
                 (−∞ −11, 
                 power threshold, 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 using the 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 36.213 [11]. 
                   
                   
               
               
                 Subframe 
                   
                   
                   
                   
                   
               
               
                 sequence 
                   
                   
                   
                   
                   
               
               
                 definition 
                   
                   
                   
                   
                   
               
               
                 &gt;Start SFN 
                 M 
                 INTEGER 
                 SFN of the radio 
                   
                   
               
               
                   
                   
                 (0 . . . 1023) 
                 frame containing 
                   
                   
               
               
                   
                   
                   
                 the first subframe 
                   
                   
               
               
                   
                   
                   
                 where the RNTP 
                   
                   
               
               
                   
                   
                   
                 Per PRB Per 
                   
                   
               
               
                   
                   
                   
                 Subframe IE is 
                   
                   
               
               
                   
                   
                   
                 valid. 
                   
                   
               
               
                 &gt;Start 
                 M 
                 INTEGER 
                 Subframe 
                   
                   
               
               
                 Subframe 
                   
                 (0 . . . 39) 
                 number, within the 
                   
                   
               
               
                 Number 
                   
                   
                 radio frame 
                   
                   
               
               
                   
                   
                   
                 indicated by the 
                   
                   
               
               
                   
                   
                   
                 Start SFN IE, of 
                   
                   
               
               
                   
                   
                   
                 the first subframe 
                   
                   
               
               
                   
                   
                   
                 when the RNTP 
                   
                   
               
               
                   
                   
                   
                 Per PRB Per 
                   
                   
               
               
                   
                   
                   
                 Subframe IE is 
                   
                   
               
               
                   
                   
                   
                 valid. 
                   
                   
               
               
                 No. of 
                 M 
                 1 . . . 40 
                 No. of subframes 
                   
                   
               
               
                 subframes 
                   
                   
                 for which is 
                   
                   
               
               
                   
                   
                   
                 defined the 
                   
                   
               
               
                   
                   
                   
                 bitstream 
                   
                   
               
               
                 Periodicity 
                   
                 1 . . . 40 
                 The number of 
                   
                   
               
               
                   
                   
                   
                 subframes after 
                   
                   
               
               
                   
                   
                   
                 which the bit 
                   
                   
               
               
                   
                   
                   
                 pattern is 
                   
                   
               
               
                   
                   
                   
                 repeated 
                   
                   
               
               
                 Number Of 
                 M 
                 ENUMERATED 
                 P (number of 
                   
                   
               
               
                 Cell-specific 
                   
                 (1, 2, 4, . . .) 
                 antenna ports for 
                   
                   
               
               
                 Antenna 
                   
                   
                 cell-specific 
                   
                   
               
               
                 Ports 
                   
                   
                 reference signals) 
                   
                   
               
               
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.211 [10] 
                   
                   
               
               
                 P_B 
                 M 
                 INTEGER 
                 P B  is defined in 
                   
                   
               
               
                   
                   
                 (0 . . . 3, . . .) 
                 TS 36.213 [11]. 
               
               
                   
               
             
          
         
       
     
         [0115]    The point in the table given above is that since the choice ‘11’ already indicates no promise on the power level (which covers the case of transmit power being arbitrarily high) we can use three thresholds (instead of two) since there is no need to convey that the power level is greater than HPTH (as this is subsumed by ‘11’). 
         [0116]    However, one problem with indicating multiple thresholds is that the current CoMP hypothesis (implicitly) assumes just one threshold. In this sense there is a mismatch between using multiple thresholds in eRNTP and not in the CoMP hypothesis. Consequently, the full potential of multiple thresholds may not be realized inspire of the additional overhead. 
       Embodiment C 
     C1. Introduction 
       [0117]    In the following we provide our views on CSI exchange, as well as proposals containing the required message structures. 
       C2. Discussion 
       [0118]    C2.1 CSI Exchange: Configuring CSI Processes 
         [0119]    From previous discussion it is evident that coordination among the eNBs is required in order to define a set of assignable CSI processes that have a consistent meaning Once the set of these CSI processes is defined, the CSI exchanged among eNBs should include the respective CSI process configuration information, in order to convey the conditions under which the CSI was measured by the UE. This configuration information should include CSI-RS-ConfigNZP [36.331b, Section 6.3.2] and CSI-IM-Config [36.331b, Section 6.3.2]. We note here that doing so would enable exchange of per-point CSI process (under which the UE estimates RS from any one point in its measurement set (or CoMP set) while the associated IMR measures the out of CoMP set or out of cluster interference) configuration. If one such process is sent to a receiving eNB for each point in that UE&#39;s measurement set, any interference hypothesis for that UE can be emulated by receiving eNB. This can indeed mitigate the bottleneck in terms defining enough CSI processes to cover sufficiently many interference hypotheses. One way of conveying this configuration information is through a look-up-table. A look-up-table mapping an index to each possible distinct CSI process configuration can be constructed (possibly separately for each eNB). Here, by a possible CSI process we mean a process that can be assigned to a served UE to measure its CSI. Such a table can be exchanged among neighbors first and from then on the configuration information can be exchanged via indices. The total number of defined processes (including their configuration information) in each table can be limited in order to limit signaling overhead. For instance, this number could be one of {7, 8, 9, 16, 32}. As an option, the configuration information for a process can also include power offset value Pc and/or offsets Pa and Pb, that were configured for that process. Further optionally, it can also indicate for which (if any) among the other processes, that process was set to be reference rank process. As an additional option, the configured feedback mode information (such as periodic or aperiodic) can also be included. 
         [0120]    C2.2 CSI Exchange: Contents 
         [0121]    One eNB can send CSI reports pertaining to one or more of its UEs to a neighboring eNB. For each UE, the CSI that the eNB sends to a neighbor can comprise: 
         [0122]    CQI: up-to 2 CQIs, each including a wideband component and possible sub-band components 
         [0123]    RI: one wideband component 
         [0124]    We note that the PMI was excluded from the CSI exchange report [1]. The justification for this exclusion was to minimize the overhead and the fact that PMI can depend on fast changing channel information, thus reducing its utility over non ideal backhaul with a higher latency. However, in the absence of PMI the use of RI is limited. Indeed, any rank greater than 1 will convey only 2 CQI(s), one for each of the two codewords. No further information about the (average) spatial directions seen by that UE can be deduced by the eNB receiving the report. As a result, reporting the RI should be made optional. Moreover, the eNB requesting the CSI report (eNB 1 ) should be able to specify whether or not it would like to receive RI reports. Similarly, the eNB requesting the CSI reports should be able to specify whether or not it requires subband specific CQI reports. This can be achieved by setting a bit (in the measurement request) to be 0 if rank is not requested and 1 otherwise. Another bit can be set to 0 if subband CQIs are not requested and 1 otherwise. In this context, we note that since the requesting eNB has no control over how the sending eNB (eNB 2 ) configures CSI processes (and constituent feedback modes) for its users, it should be in any case able to exploit different type of CSI reports (wideband only or wideband and subband). 
         [0125]    Proposal: Include optional IE in resource status request indicating whether RI and/or subband CQI should be sent in the resource status response message. 
         [0126]    Implementation based processing of the short-term CSI (received via over-the-air signaling) by the sending eNB, prior to CSI exchange has been agreed. In this context, we believe that reporting full (complete) CQI (with 16 possibilities), where each such CQI follows the definition of a 4 bit CQI (Cf. TS 36.213), for each indicated subband instead of differential CQI is useful. This has main two advantages. It allows the sending eNB full freedom in obtaining these CQIs. Indeed, it is desirable to not impose restrictions on sending eNB 2  on how it processes or combines reports from multiple different feedback modes configured for a UE under the same CSI process. Secondly, the receiving eNB can be agnostic to the configured feedback modes. This latter point is important because when aperiodic feedback mode 3-1 is configured for the UE (by eNB 2 ), the UE reported sub band CQI is encoded differentially with respect to the corresponding wideband CQI using 2 bits representing differential values {−2, 0, 1, 2}. On the other hand, in the case of aperiodic feedback mode 2-0 or 2-2, only the best M-average CQI is reported by the UE by differentially encoding it with respect to a corresponding wideband CQI, using 2 bits representing differential values {1, 2, 3, 4}. Further, in case of periodic feedback mode 2-1 the CQI corresponding to codeword-1 for each UE selected subband within a bandwidth part can itself be of 4 bits, whereas that of codeword-2 (when RI&gt;1) is differentially encoded with respect to CQI of codeword-1 using 3 bits. 
         [0127]    It becomes apparent from the above discussion that a transparent way of conveying CQI (without having to convey all details regarding to one or more feedback modes configured under that CSI process for that UE) is to allow for full (complete) CQI for each indicated subband. 
         [0128]    Proposal: Convey each subband CQI using full representation (4 bits or 16 possibilities) 
         [0129]    Next, we consider subband indexing and propose an alternative in which the subband selection (including their sizes, indices) is conveyed by means of a combinatorial index which is described next. 
         [0130]    This idea is a simple extension of that used in TS 36.213 for aperiodic feedback mode 2-*. In particular, depending on the number of PRBs (or RBs for short) in the downlink available at sending eNB 2  (a parameter which is known or conveyed separately to the receiving eNB 1 ), the set of all possible subband selections that can be made together with the subband sizes for all feedback modes can be deduced by eNB 1 . 
         [0131]    For example when 110 RBs are available at eNB 2  (and this number is conveyed to eNB 1 ) eNB 1  can deduce that for a UE configured under: 
         [0132]    Aperiodic, Mode 2-*: 6 UE selected subband indices 
         [0133]    A subframe is composed of 28 subbands. Among 28 subbands, 6 subbands are selected by the UE. The number of PRBs in the subbands is 4 except for the last one; the number of PRBs in the last subband is 2 (4*27+2=110). 
         [0134]    For Aperiodic, Mode 3-*: 14 higher layer-configured sub bands 
         [0135]    A subframe is composed of 14 subbands. The number of PRBs in the subband is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0136]    For Periodic, Mode 2-*: 4 UE selected subband indices (with an additional constraint on choosing one sub band per bandwidth portion or part) 
         [0137]    A subframe is composed of 14 subbands. Among 14 subbands, 4 subbands are selected by the UE. The number of PRBs in the subbands is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0138]    Then, considering all possible feasible subband selections under all the aforementioned feedback modes, it is possible to assign a unique label to each distinct feasible selection of sub bands. All possible such labels together decide the range of a combinatorial index R. As a result, knowing the value of R the receiving eNB can deduce the subband selection. The associated CQIs (one for each subband in the indicated selection) can be ordered in the increasing order of the frequency range represented by the indicated subbands. Each such CQI can be conveyed using full representation (i.e., using 16 possibilities) which can then be directly used by the receiving eNB 1 . 
         [0139]    Proposal: Convey subband indexing and size information via a combinatorial index. 
         [0140]    Another issue that is important, is to ensure that the RI and CQIs conveyed by eNB 2  to eNB 1  in a UE CSI report are mutually consistent, i.e., all the reported CQIs are computed by the UE for the same RI (which is identical to the one in the Rank Indication IE when the latter is present). This issue is important to address because under certain feedback modes (such as periodic mode 2-1) the RI and the wideband CQI(s) as well as the subband CQI(s) for one or more bandwidth portions can be reported by the UE on different subframes. Thus, depending on the periodicity defined by eNB 1  in its CSI request, it can happen that the latest RI available for the UE under the CSI process, can be different from the one for which one or more of the most recently available CQI(s) are computed. In such a case, the sending eNB 2  should ensure that its CSI report is consistent, for instance by using the RI value for which the most recently available CQI(s) have been computed. 
         [0141]    Proposal: Sending eNB must ensure RI and CQI(s) conveyed in a CSI report are mutually consistent. 
         [0142]    One of the goals of CSI exchange is to facilitate centralized RRM. In a scenario with centralized RRM, the central node receiving the CSI reports should be able to keep track of the CSI information received for each particular UE, over all the received CSI reports. In order to ensure this, it has been agreed that a UE identifier will be included in each CSI report for each UE whose CSI is conveyed in that report. This ID should enable the receiving node to deduce which ones among all the reports that it receives, belongs to that user, thereby facilitating RRM. Including a similar UE ID in the reference signal received power (RSRP) reports will also be beneficial and allow the receiving eNB to combine or jointly exploit these two sets of reports. 
         [0143]    Proposal: Include UE ID in RSRP measurement report 
         [0144]    Proposals: 
         [0145]    9.1.2.11 RESOURCE STATUS REQUEST 
         [0146]    This message is sent by an eNB 1  to a neighbouring eNB 2  to initiate the requested measurement according to the parameters given in the message. 
         [0147]    Direction: eNB 1 →eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE C1 
               
               
                   
               
             
             
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
               
                 Message 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 reject 
               
               
                 Type 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 1   
               
               
                 ID 
               
               
                 eNB2 
                 C-ifRegistrationRequestStop 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 ignore 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 2   
               
               
                 ID 
               
               
                 Registration 
                 M 
                   
                 ENUMERATED 
                 A value set to 
                 YES 
                 reject 
               
               
                 Request 
                   
                   
                 (start, 
                 “stop”, 
               
               
                   
                   
                   
                 stop, . . . ) 
                 indicates a 
               
               
                   
                   
                   
                   
                 request to 
               
               
                   
                   
                   
                   
                 stop all cells 
               
               
                   
                   
                   
                   
                 measurements. 
               
               
                 Report 
                 O 
                   
                 BITSTRING 
                 Each position 
                 YES 
                 reject 
               
               
                 Characteristics 
                   
                   
                 (SIZE(32)) 
                 in the bitmap 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 object the 
               
               
                   
                   
                   
                   
                 eNB 2  is 
               
               
                   
                   
                   
                   
                 requested to 
               
               
                   
                   
                   
                   
                 report. 
               
               
                   
                   
                   
                   
                 First Bit = 
               
               
                   
                   
                   
                   
                 PRB Periodic, 
               
               
                   
                   
                   
                   
                 Second Bit = 
               
               
                   
                   
                   
                   
                 TNL load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Third Bit = 
               
               
                   
                   
                   
                   
                 HW Load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Fourth Bit = 
               
               
                   
                   
                   
                   
                 Composite 
               
               
                   
                   
                   
                   
                 Available 
               
               
                   
                   
                   
                   
                 Capacity 
               
               
                   
                   
                   
                   
                 Periodic, this 
               
               
                   
                   
                   
                   
                 bit should be 
               
               
                   
                   
                   
                   
                 set to 1 if at 
               
               
                   
                   
                   
                   
                 least one of 
               
               
                   
                   
                   
                   
                 the First, 
               
               
                   
                   
                   
                   
                 Second or 
               
               
                   
                   
                   
                   
                 Third bits is 
               
               
                   
                   
                   
                   
                 set to 1, 
               
               
                   
                   
                   
                   
                 Fifth Bit = 
               
               
                   
                   
                   
                   
                 ABS Status 
               
               
                   
                   
                   
                   
                 Periodic, Xth 
               
               
                   
                   
                   
                   
                 Bit = UE-CSI 
               
               
                   
                   
                   
                   
                 Periodic. 
               
               
                   
                   
                   
                   
                 Other bits 
               
               
                   
                   
                   
                   
                 shall be 
               
               
                   
                   
                   
                   
                 ignored by the 
               
               
                   
                   
                   
                   
                 eNB 2 . 
               
               
                 Cell To 
                   
                 1 
                   
                 Cell ID list for 
                 YES 
                 ignore 
               
               
                 Report 
                   
                   
                   
                 which 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 is needed 
               
               
                 &gt;Cell To 
                   
                 1 . . . &lt;maxCellineNB&gt; 
                   
                   
                 EACH 
                 ignore 
               
               
                 Report Item 
               
               
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
                   
                 — 
                 — 
               
               
                   
                   
                   
                 9.2.14 
               
               
                 Reporting 
                 O 
                   
                 ENUMERATED 
                   
                 YES 
                 ignore 
               
               
                 Periodicity 
                   
                   
                 (1000 ms, 
               
               
                   
                   
                   
                 2000 ms, 
               
               
                   
                   
                   
                 5000 ms, 10000 ms, . . . ) 
               
               
                 Partial 
                 O 
                   
                 ENUMERATED 
                 Included if 
                 YES 
                 ignore 
               
               
                 Success 
                   
                   
                 (partial 
                 partial 
               
               
                 Indicator 
                   
                   
                 success 
                 success is 
               
               
                   
                   
                   
                 allowed, . . . ) 
                 allowed 
               
               
                 CSI 
                 O 
                   
                 BITSTRING 
                 Each position 
                 YES 
                 ignore 
               
               
                 Measurement 
                   
                   
                 (SIZE(2)) 
                 in the bitmap 
               
               
                 Report type 
                   
                   
                   
                 indicates the 
               
               
                   
                   
                   
                   
                 type of CSI 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 to report. 
               
               
                   
                   
                   
                   
                 First 
               
               
                   
                   
                   
                   
                 bit = Rank, 
               
               
                   
                   
                   
                   
                 Second 
               
               
                   
                   
                   
                   
                 bit = subband 
               
               
                   
                   
                   
                   
                 CQI. 
               
               
                 Reporting 
                 O 
                   
                 ENUMERATED 
                 Periodicity for 
                 YES 
                 ignore 
               
               
                 Periodicity of 
                   
                   
                 (5 ms, 
                 CSI 
               
               
                 CSI 
                   
                   
                 10 ms, 
                 Measurement 
               
               
                 Measurement 
                   
                   
                 20 ms, 40 ms, 
                 Report 
               
               
                 Report 
                   
                   
                 80 ms, 
                 Periodic 
               
               
                   
                   
                   
                 aperiodic, . . . ) 
               
               
                   
               
             
          
           
               
                   
                   
                 Explanation 
               
               
                   
                   
               
               
                   
                 Condition 
               
               
                   
                 ifRegistrationRequestStop 
                 This IE shall be present if the Registration Request IE is 
               
               
                   
                   
                 set to the value “stop”. 
               
               
                   
                 Range bound 
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value 
               
               
                   
                   
                 is 256. 
               
               
                   
                   
               
             
          
         
       
     
         [0148]    9.1.2.14 RESOURCE STATUS UPDATE 
         [0149]    This message is sent by eNB 2  to neighbouring eNB 1  to report the results of the requested measurements. 
         [0150]    Direction: eNB 2 →eNB 1 . 
         [0151]    9.2.aa UE-CSI Report 
         [0152]    This IE provides UE-CSI information for a set of UEs served by eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE C2 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                 &gt;CSI report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 process 
                   
                 &lt;maxCSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 INTEGER 
                 The rank indicator 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in 
               
               
                   
                   
                   
                   
                 the associated 
               
               
                   
                   
                   
                   
                 request. In that 
               
               
                   
                   
                   
                   
                 case Cf. TS 
               
               
                   
                   
                   
                   
                 36.213 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 INTEGER 
                   
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 INTEGER 
                   
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;combinatorial 
                 O 
                   
                 Integer FFS 
                 This IE is present 
               
               
                 index 
                   
                   
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 0 . . . 
                   
                 The number of 
               
               
                   
                   
                 &lt;maxCQISubbands &gt; 
                   
                 subbands in the list 
               
               
                   
                   
                   
                   
                 as well as their 
               
               
                   
                   
                   
                   
                 respective indices 
               
               
                   
                   
                   
                   
                 and sizes are 
               
               
                   
                   
                   
                   
                 deduced from the 
               
               
                   
                   
                   
                   
                 combinatorial index. 
               
               
                   
                   
                   
                   
                 Subband CQIs are 
               
               
                   
                   
                   
                   
                 sorted in the order of 
               
               
                   
                   
                   
                   
                 increasing 
               
               
                   
                   
                   
                   
                 frequency. 
               
               
                 &gt;&gt;&gt;&gt;Subband CQI  
                 M 
                   
                 INTEGER 
                   
               
               
                 for codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 INTEGER 
                   
               
               
                 for codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                   
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 Configuration 
                   
                   
                   
                 configuration 
               
               
                 information 
                   
                   
                   
                 information. 
               
               
                   
               
             
          
         
       
     
         [0153]    We now consider eRNTP exchange. 
         [0154]    It has been agreed that eRNTP will be delivered with the Load Information message. 
         [0155]    In the following, we provide our views on content of this message, as well as a proposal. 
       C3. Discussion 
       [0156]    C3.1 eRNTP Exchange 
         [0157]    One concern is that a receiving eNB does not have the means to differentiate the “meaning” of the CoMP hypothesis. In particular, a potential issue is that the signaled hypothesis could be a “suggestion” by the sender or an “action” which implies that the pattern in the hypothesis will be applied. A proposed solution to this issue is to introduce an indicator IE in the CoMP Information IE to convey that the constituent resource allocation is an action. This proposal can be useful if a common pre-configured threshold is used (or implicitly assumed) with or with our this indicator IE. In other words, the “suggestion for” as well as the “action” by an eNB (or cell) are based on a common threshold (pre-configured for that eNB or cell and known to its neighbors). Another slightly more preferable option is to enhance and use the existing RNTP in order to convey the “action”. The enhancements can be done in two ways. The contents are captured in two corresponding proposals attached in the sequel. 
         [0158]    The first presented proposal is based on a single threshold and exploits that fact that the RNTP (i.e., downlink (DL) power restriction) for the first subframe (subframe #0) is always conveyed. Then, if no information about the DL power restriction on any subsequent subframe is conveyed, the one conveyed for the first subframe can be assumed to remain static (i.e., applicable over subsequent subframes). 
         [0159]    The second proposal is based one multiple thresholds. The point here is that since the choice ‘11’ already indicates no promise on the power level (which covers the case of transmit power being arbitrarily high) we can use three thresholds (instead of two), since there is no need to convey that the power level is greater than HPTH (as this is subsumed by ‘11’) 
         [0160]    Proposal: 
         [0161]    9.2.19 Relative Narrowband Tx Power (RNTP) 
         [0162]    This IE provides an indication on DL power restriction per PRB in a cell and other information needed by a neighbour eNB for interference aware scheduling. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE C3 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP Per PRB 
                 M 
                   
                 BIT STRING 
                 Each position in 
                 — 
                 — 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 the bitmap 
               
               
                   
                   
                   
                   
                 represents a n PRB   
               
               
                   
                   
                   
                   
                 value (i.e. first 
               
               
                   
                   
                   
                   
                 bit = PRB 0 and so 
               
               
                   
                   
                   
                   
                 on), for which the 
               
               
                   
                   
                   
                   
                 bit value 
               
               
                   
                   
                   
                   
                 represents RNTP 
               
               
                   
                   
                   
                   
                 (n PRB ), defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 indicates 
               
               
                   
                   
                   
                   
                 “Tx not exceeding 
               
               
                   
                   
                   
                   
                 RNTP threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 indicates 
               
               
                   
                   
                   
                   
                 “no promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. This IE is 
               
               
                   
                   
                   
                   
                 used to indicate 
               
               
                   
                   
                   
                   
                 DL power 
               
               
                   
                   
                   
                   
                 restriction per PRB 
               
               
                   
                   
                   
                   
                 for the first 
               
               
                   
                   
                   
                   
                 subframe. 
               
               
                   
                   
                   
                   
                 In case the DL 
               
               
                   
                   
                   
                   
                 power restriction is 
               
               
                   
                   
                   
                   
                 static, the indicated 
               
               
                   
                   
                   
                   
                 DL power 
               
               
                   
                   
                   
                   
                 restriction is 
               
               
                   
                   
                   
                   
                 maintained over 
               
               
                   
                   
                   
                   
                 the subsequent 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, −11, 
                 defined in TS 
               
               
                   
                   
                   
                 −10, −9, −8, −7, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −6, −5, −4, −3, 
               
               
                   
                   
                   
                 −2, −1, 0, 1, 2, 
               
               
                   
                   
                   
                 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports for 
               
               
                 Antenna Ports 
                   
                   
                   
                 cell-specific 
               
               
                   
                   
                   
                   
                 reference signals) 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in TS 
                 — 
                 — 
               
               
                   
                   
                   
                 (0. . . 3, . . . ) 
                 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted Number 
               
               
                 Impact 
                   
                   
                   
                 Of Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see TS 
               
               
                   
                   
                   
                   
                 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means “no 
               
               
                   
                   
                   
                   
                 prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 Extended 
                 O 
                   
                 BIT STRING 
                 Each position in 
               
               
                 RNTP Per 
                   
                   
                 (6 . . . 4290, . . . ) 
                 the bitmap 
               
               
                 PRB 
                   
                   
                   
                 represents a PRB 
               
               
                   
                   
                   
                   
                 in a subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates ‘no 
               
               
                   
                   
                   
                   
                 promise on the Tx 
               
               
                   
                   
                   
                   
                 power is given’ 
               
               
                   
                   
                   
                   
                 and value “0” 
               
               
                   
                   
                   
                   
                 indicates ‘Tx not 
               
               
                   
                   
                   
                   
                 exceeding RNTP 
               
               
                   
                   
                   
                   
                 threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, the second 
               
               
                   
                   
                   
                   
                 bit corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, and so on. 
               
               
                   
                   
                   
                   
                 The length of the 
               
               
                   
                   
                   
                   
                 bit string is an 
               
               
                   
                   
                   
                   
                 integer (maximum 
               
               
                   
                   
                   
                   
                 39) multiple of 
               
               
                   
                   
                   
                   
                 nDLRB, which is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string may 
               
               
                   
                   
                   
                   
                 span across 
               
               
                   
                   
                   
                   
                 multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern across 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes (formed 
               
               
                   
                   
                   
                   
                 by RNTP per PRB 
               
               
                   
                   
                   
                   
                 and extended 
               
               
                   
                   
                   
                   
                 RNTP per PRB) is 
               
               
                   
                   
                   
                   
                 continuously 
               
               
                   
                   
                   
                   
                 repeated 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB start time 
               
               
                 &gt;Starting SFN 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                   
                   
                   
                 (0 . . . 1023, . . . ) 
                 frame containing 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe number, 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 within the radio 
               
               
                 Index 
                   
                   
                   
                 frame indicated by 
               
               
                   
                   
                   
                   
                 the Start SFN IE, 
               
               
                   
                   
                   
                   
                 of the first 
               
               
                   
                   
                   
                   
                 subframe when the 
               
               
                   
                   
                   
                   
                 RNTP Per PRB IE 
               
               
                   
                   
                   
                   
                 is valid. 
               
               
                   
               
             
          
         
       
     
         [0163]    The second alternative is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE C4 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 ERNTP Per 
                 M 
                   
                 BIT STRING 
                 Each position in 
                 — 
                 — 
               
               
                 PRB and 
                   
                   
                 (12 . . . 220, . . . ) 
                 the bitmap 
               
               
                 subframe 
                   
                   
                   
                 represents a 
               
               
                   
                   
                   
                   
                 PRB in a 
               
               
                   
                   
                   
                   
                 subframe, for 
               
               
                   
                   
                   
                   
                 which the value 
               
               
                   
                   
                   
                   
                 “xx” indicates 
               
               
                   
                   
                   
                   
                 how the 
               
               
                   
                   
                   
                   
                 transmission 
               
               
                   
                   
                   
                   
                 power in a 
               
               
                   
                   
                   
                   
                 resource block is 
               
               
                   
                   
                   
                   
                 mapped relative 
               
               
                   
                   
                   
                   
                 to the three 
               
               
                   
                   
                   
                   
                 power 
               
               
                   
                   
                   
                   
                 thresholds: 
               
               
                   
                   
                   
                   
                 00—power level 
               
               
                   
                   
                   
                   
                 not exceeding 
               
               
                   
                   
                   
                   
                 the LPTH 
               
               
                   
                   
                   
                   
                 01—power level 
               
               
                   
                   
                   
                   
                 between LPTH 
               
               
                   
                   
                   
                   
                 and MPTH; 
               
               
                   
                   
                   
                   
                 10—power level 
               
               
                   
                   
                   
                   
                 between MPTH 
               
               
                   
                   
                   
                   
                 and HPTH; 
               
               
                   
                   
                   
                   
                 11—no promise 
               
               
                   
                   
                   
                   
                 on the Tx power 
               
               
                   
                   
                   
                   
                 is given. 
               
               
                   
                   
                   
                   
                 The first 2 bits 
               
               
                   
                   
                   
                   
                 correspond to 
               
               
                   
                   
                   
                   
                 PRB 0 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the IE is 
               
               
                   
                   
                   
                   
                 valid, the 
               
               
                   
                   
                   
                   
                 following 2 bits 
               
               
                   
                   
                   
                   
                 correspond to 
               
               
                   
                   
                   
                   
                 PRB 1 of the first 
               
               
                   
                   
                   
                   
                 subframe for 
               
               
                   
                   
                   
                   
                 which the IE is 
               
               
                   
                   
                   
                   
                 valid, and so on. 
               
               
                   
                   
                   
                   
                 The bit string 
               
               
                   
                   
                   
                   
                 may span across 
               
               
                   
                   
                   
                   
                 multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The length of the 
               
               
                   
                   
                   
                   
                 bit string is an 
               
               
                   
                   
                   
                   
                 integer 
               
               
                   
                   
                   
                   
                 (maximum 40) 
               
               
                   
                   
                   
                   
                 multiple of 
               
               
                   
                   
                   
                   
                 nDLRB. The 
               
               
                   
                   
                   
                   
                 parameter is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The ERNTP 
               
               
                   
                   
                   
                   
                 pattern is 
               
               
                   
                   
                   
                   
                 continuously 
               
               
                   
                   
                   
                   
                 repeated with a 
               
               
                   
                   
                   
                   
                 periodicity 
               
               
                   
                   
                   
                   
                 indicated in 
               
               
                   
                   
                   
                   
                 Periodicity. 
               
               
                 Transmitted 
               
               
                 power levels 
               
               
                 LPTH (Low 
                 M 
                   
                 ENUMERATED 
                 Lower RNTP 
                 — 
                 — 
               
               
                 Power 
                   
                   
                 (−∞, −11, 
                 power threshold, 
               
               
                 Threshold) 
                   
                   
                 −10, −9, −8, 
                 using the 
               
               
                   
                   
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
               
               
                   
                   
                   
                 1, 2, 3, . . . ) 
                 36.213 [11]. 
               
               
                 MPTH 
                 M 
                   
                 ENUMERATED 
                 Medium RNTP 
               
               
                 (Medium 
                   
                   
                 (−∞, −11, 
                 power threshold, 
               
               
                 Power 
                   
                   
                 −10, −9, −8, 
                 using the 
               
               
                 Threshold) 
                   
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
               
               
                   
                   
                   
                 1, 2, 3, . . . ) 
                 36.213 [11]. 
               
               
                 HPTH (High 
                 M 
                   
                 ENUMERATED 
                 Higher RNTP 
               
               
                 Power 
                   
                   
                 (−∞, −11, 
                 power threshold, 
               
               
                 Threshold) 
                   
                   
                 −10, −9, −8, 
                 using the 
               
               
                   
                   
                   
                 −7, −6, −5, −4, 
                 RNTP threshold   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
               
               
                   
                   
                   
                 1, 2, 3, . . . ) 
                 36.213 [11]. 
               
               
                 Subframe 
               
               
                 sequence 
               
               
                 definition 
               
               
                 &gt;Start SFN 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                   
                   
                   
                 (0 . . . 1023) 
                 frame containing 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 where the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Start 
                 M 
                   
                 INTEGER 
                 Subframe 
               
               
                 Subframe 
                   
                   
                 (0 . . . 39) 
                 number, within 
               
               
                 Number 
                   
                   
                   
                 the radio frame 
               
               
                   
                   
                   
                   
                 indicated by the 
               
               
                   
                   
                   
                   
                 Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 No. of 
                 M 
                   
                 1 . . . 40 
                 No. of subframes 
               
               
                 subframes 
                   
                   
                   
                 for which is 
               
               
                   
                   
                   
                   
                 defined the 
               
               
                   
                   
                   
                   
                 bitstream 
               
               
                 Periodicity 
                   
                   
                 1 . . . 40 
                 The number of 
               
               
                   
                   
                   
                   
                 subframes after 
               
               
                   
                   
                   
                   
                 which the bit 
               
               
                   
                   
                   
                   
                 pattern is 
               
               
                   
                   
                   
                   
                 repeated 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports for 
               
               
                 Antenna Ports 
                   
                   
                   
                 cell-specific 
               
               
                   
                   
                   
                   
                 reference 
               
               
                   
                   
                   
                   
                 signals) defined 
               
               
                   
                   
                   
                   
                 in TS 36.211 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 TS 36.213 [11]. 
               
               
                   
               
             
          
         
       
     
       Embodiment D 
     D1. Introduction 
       [0164]    In the following we provide our views on CSI and eRNTP exchange, as well as proposals containing the required message structures. 
       D2. Discussion 
       [0165]    D2.1 CSI Exchange: Configuring CSI Processes 
         [0166]    The concept of CSI processes was defined in Rel.11 to enable CSI feedback from a UE to its serving eNB. The CSI feedback is determined for each CSI process according to the serving TP and interference hypothesis configured in that process. Each CSI process that is configured for a UE, comprises a set of resource elements on which non-zero power CSI-RSs are sent and a channel estimate is obtained by that UE using observations received on those resource elements. 
         [0167]    In addition, a set of resource elements is also indicated by the CSI process (referred to as interference measurement resources (IMRs)) on which the UE estimates the covariance of the interference it observes. The channel and covariance estimates are together used by the UE to determine and send its feedback report corresponding to that CSI process. Multiple such CSI processes (up-to 4) can be configured for a UE, each process corresponding to a different choice of signal or interference hypothesis. Moreover, in the scenario in which fast switching of the serving TP is not possible, different CSI processes that are configured for any given UE typically correspond to different choices of interference hypothesis. 
         [0168]    Note from the brief discussion above that in the event the interference hypothesis of a configured CSI process presumes muting from a TP (that is a dominant interferer for the UE of interest) which is controlled by the neighboring eNB, coordination among the eNBs is required in order to ensure that the interference estimated by the UE on the constituent IMRs is consistent with the assumed hypothesis. Another similar event that requires coordination is if the non-zero power CSI-RSs indicated in the CSI process must be interference protected in order to ensure reliable channel estimation at the UE. In both these events, the dominant interferer that is controlled by the neighboring eNB must be muted on certain resource elements. Thus, a mechanism (with appropriate signaling) should be available to share the CSI-RS (comprising non-zero power CSI-RSs and IMRs) configurations between eNBs, which would facilitate configuration of CSI processes across multiple eNBs. 
         [0169]    Once the CSI processes are configured, the CSI exchanged among eNBs over the backhaul should include the respective CSI process configuration information, in order to convey the conditions under which the CSI was measured by the UE. This configuration information includes non-zero power CSI-RS information and IMR information (comprising the subframe indices and zero-power CSI-RS information). Since this configuration is anyway informed to the UE via RRC (or higher layer) signaling, the same information can be reused as a container to convey the configuration to the neighboring eNB. 
         [0170]    Another way of conveying this configuration information is through a look-up-table. A look-up-table mapping an index to one or more distinct applied CSI process configurations can be constructed for each eNB. Here, by an applied CSI process we mean a process that is used by at-least one UE served by that eNB to measure its CSI. Such a table can be exchanged among neighbors first and from then on the configuration information can be exchanged via indices. The total number of configurations in the table can be limited in order to limit signaling overhead. 
         [0171]    Suitable values for the number of configurations in this table are either 8 or 16 or 32. 
         [0172]    D2.2 CSI Exchange: Contents 
         [0173]    One eNB can send CSI report pertaining to one or more of UEs to a neighboring eNB. For each UE, the CSI that the eNB sends to a neighbor can comprise: 
         [0174]    CQI: up-to 2 CQIs, each including a wideband component and possible sub-band differential components 
         [0175]    RI: one wideband component 
         [0176]    We note that the PMI was excluded from the CSI exchange report [1]. The justification for this exclusion was to minimize the overhead and the fact that PMI can depend on fast changing channel information, thus reducing its utility over non ideal backhaul with a higher latency. However, in the absence of PMI the use of RI is limited. Indeed, any rank greater than 1 will convey only 2 CQI(s), one for each of the two codewords. No further information about the (average) spatial directions seen by that UE can be deduced by the eNB receiving the report. As a result, reporting the RI should be made optional. Moreover, the eNB requesting the CSI report should be able to specify whether or not it would like to receive RI reports. Similarly, the eNB requesting the CSI reports should be able to specify whether or not it requires subband specific CQI reports. This can be achieved by setting a bit (in the measurement request) to be 0 if rank is not requested and 1 otherwise. Another bit can be set to 0 if subband CQIs are not requested and 1 otherwise. 
         [0177]    Processing (filtering or subsampling) of the short-term CSI (received via over-the-air signaling) at an eNB prior to exchange should be permitted. 
         [0178]    One use case for this is when the periodicity of the CSI report that is requested by eNB 1  to its neighbor eNB 2 , is larger than the over-the-air CSI signaling periodicity configured by eNB 2 . In this case eNB 2  has to do some processing (such as subsampling or averaging) of the reports it receives before it sends it to eNB 1 . In this context, we note that the subsampling employed by eNB 2  should be understood by eNB 1  (if needed additional signaling can be added to ensure this). One possible way this can be accomplished (without any signaling overhead) is for eNB 2  to use the subsampling factor determined by a pre-determined rule (known to or configured for all eNBs in advance) that outputs a subsampling factor, given the requested periodicity and CSI process configuration as inputs. On the other hand, averaging or scaling or filtering employed by eNB 2  can be transparent to the receiving eNB 1 . 
         [0179]    One of the goals of CSI exchange is to facilitate centralized RRM [3]. In a scenario with centralized RRM, the central node receiving the CSI reports should be able to keep track of the CSI information received for each particular UE, over all the received CSI reports. This can be achieved by including a UE identifier in each CSI report for each UE whose CSI is conveyed in that report. We want to include a unique ID for each user so that the receiving node knows which ones among all the reports that it receives, belong that user. This will be useful for RRM. Otherwise the receiving eNB will regard each received report as belonging to a distinct user. This can lead to sub-optimal resource allocation. 
         [0180]    D2.3 eRNTP Exchange 
         [0181]    Our view on eRNTP exchange is captured in a corresponding proposal attached in the end of this embodiment. 
         [0182]    We note that the RNTP (i.e., downlink (DL) power restriction) for the first subframe is always conveyed. If no information about the DL power restriction on any subsequent subframe is conveyed, then the one conveyed for the first subframe can be assumed to remain static (i.e., applicable over subsequent subframes). 
         [0183]    We also present several variations, one of which includes the use of multiple thresholds 
       D3. Conclusion 
       [0184]    We discussed the necessary X2 message to support CSI and eRNTP exchange for inter-eNB CoMP and presented corresponding proposals. 
         [0185]    Proposal: 
         [0186]    9.1.2.11 RESOURCE STATUS REQUEST 
         [0187]    This message is sent by an eNB 1  to a neighbouring eNB 2  to initiate the requested measurement according to the parameters given in the message. 
         [0188]    Direction: eNB 1 →eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE D1 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 reject 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 1   
               
               
                 ID 
               
               
                 eNB2 
                 C-ifRegistrationRequestStop 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 ignore 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 2   
               
               
                 ID 
                   
               
               
                 Registration 
                 M 
                   
                 ENUMERATED 
                 A value set to 
                 YES 
                 reject 
               
               
                 Request 
                   
                   
                 (start, 
                 “stop”, indicates 
               
               
                   
                   
                   
                 stop, . . . ) 
                 a request to stop 
               
               
                   
                   
                   
                   
                 all cells 
               
               
                   
                   
                   
                   
                 measurements. 
               
               
                 Report 
                 O 
                   
                 BITSTRING 
                 Each position in 
                 YES 
                 reject 
               
               
                 Characteristics 
                   
                   
                 (SIZE(32)) 
                 the bitmap 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 measurement 
               
               
                   
                   
                   
                   
                 object the eNB 2   
               
               
                   
                   
                   
                   
                 is requested to 
               
               
                   
                   
                   
                   
                 report. 
               
               
                   
                   
                   
                   
                 First Bit = PRB 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Second Bit = 
               
               
                   
                   
                   
                   
                 TNL load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Third Bit = HW 
               
               
                   
                   
                   
                   
                 Load Ind 
               
               
                   
                   
                   
                   
                 Periodic, 
               
               
                   
                   
                   
                   
                 Fourth Bit = 
               
               
                   
                   
                   
                   
                 Composite 
               
               
                   
                   
                   
                   
                 Available 
               
               
                   
                   
                   
                   
                 Capacity 
               
               
                   
                   
                   
                   
                 Periodic, this bit 
               
               
                   
                   
                   
                   
                 should be set to 
               
               
                   
                   
                   
                   
                 1 if at least one 
               
               
                   
                   
                   
                   
                 of the First, 
               
               
                   
                   
                   
                   
                 Second or Third 
               
               
                   
                   
                   
                   
                 bits is set to 1, 
               
               
                   
                   
                   
                   
                 Fifth Bit = ABS 
               
               
                   
                   
                   
                   
                 Status 
               
               
                   
                   
                   
                   
                 Periodic, Xth Bit = 
               
               
                   
                   
                   
                   
                 UE-CSI 
               
               
                   
                   
                   
                   
                 Periodic. 
               
               
                   
                   
                   
                   
                 Other bits shall 
               
               
                   
                   
                   
                   
                 be ignored by 
               
               
                   
                   
                   
                   
                 the eNB 2 . 
               
               
                 Cell To 
                   
                 1 
                   
                 Cell ID list for 
                 YES 
                 ignore 
               
               
                 Report 
                   
                   
                   
                 which 
               
               
                   
                   
                   
                   
                 measurement is 
               
               
                   
                   
                   
                   
                 needed 
               
               
                 &gt;Cell To 
                   
                 1 . . . &lt;maxCellineNB&gt; 
                   
                   
                 EACH 
                 ignore 
               
               
                 Report Item 
               
               
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
                   
                 — 
                 — 
               
               
                   
                   
                   
                 9.2.14 
               
               
                 Reporting 
                 O 
                   
                 ENUMERATED 
                   
                 YES 
                 ignore 
               
               
                 Periodicity 
                   
                   
                 (1000 ms, 
               
               
                   
                   
                   
                 2000 ms, 
               
               
                   
                   
                   
                 5000 ms, 10000 ms, . . . ) 
               
               
                 Partial 
                 O 
                   
                 ENUMERATED 
                 Included if 
                 YES 
                 ignore 
               
               
                 Success 
                   
                   
                 (partial 
                 partial success 
               
               
                 Indicator 
                   
                   
                 success 
                 is allowed 
               
               
                   
                   
                   
                 allowed, . . . ) 
               
               
                 CSI 
                 O 
                   
                 BITSTRING 
                 Each position in 
                 YES 
                 ignore 
               
               
                 Measurement 
                   
                   
                 (SIZE(2)) 
                 the bitmap 
               
               
                 Report type 
                   
                   
                   
                 indicates the 
               
               
                   
                   
                   
                   
                 type of CSI 
               
               
                   
                   
                   
                   
                 measurement to 
               
               
                   
                   
                   
                   
                 report. 
               
               
                   
                   
                   
                   
                 First bit = Rank, 
               
               
                   
                   
                   
                   
                 Second 
               
               
                   
                   
                   
                   
                 bit = subband 
               
               
                   
                   
                   
                   
                 CQI. 
               
               
                 ((Reporting 
                 O 
                   
                 ENUMERATED 
                 Periodicity for 
                 YES 
                 ignore 
               
               
                 Periodicity of 
                   
                   
                 (5 ms, 
                 CSI 
               
               
                 CSI 
                   
                   
                 10 ms, 
                 Measurement 
               
               
                 Measurement 
                   
                   
                 20 ms, 40 ms, 
                 Report Periodic 
               
               
                 Report 
                   
                   
                 80 ms, 
               
               
                   
                   
                   
                 aperiodic, . . . ) 
               
               
                   
               
             
          
           
               
                   
                   
                 Explanation 
               
               
                   
                   
               
               
                   
                 Range bound 
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value 
               
               
                   
                   
                 is 256. 
               
               
                   
                 Condition 
               
               
                   
                 ifRegistrationRequestStop 
                 This IE shall be present if the Registration Request IE is 
               
               
                   
                   
                 set to the value “stop”. 
               
               
                   
                   
               
             
          
         
       
     
         [0189]    9.1.2.14 RESOURCE STATUS UPDATE 
         [0190]    This message is sent by eNB 2  to neighbouring eNB 1  to report the results of the requested measurements. 
         [0191]    Direction: eNB 2 →eNB 1 . 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE D2 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 Message Type 
                 M 
                   
                 9.2.13 
                   
                 YES 
                 ignore 
               
               
                 eNB1 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 1   
               
               
                 ID 
               
               
                 eNB2 
                 M 
                   
                 INTEGER 
                 Allocated by 
                 YES 
                 reject 
               
               
                 Measurement 
                   
                   
                 (1 . . . 4095, . . . ) 
                 eNB 2   
               
               
                 ID 
               
               
                 Cell 
                   
                 1 
                   
                   
                 YES 
                 ignore 
               
               
                 Measurement 
               
               
                 Result 
               
               
                 &gt;Cell 
                   
                 1 . . . &lt;maxCellineNB&gt; 
                   
                   
                 EACH 
                 ignore 
               
               
                 Measurement 
               
               
                 Result 
               
               
                 Item 
               
               
                 &gt;&gt;Cell ID 
                 M 
                   
                 ECGI 
               
               
                   
                   
                   
                 9.2.14 
               
               
                 &gt;&gt;Hardware 
                 O 
                   
                 9.2.34 
               
               
                 Load 
               
               
                 Indicator 
               
               
                 &gt;&gt;S1 TNL 
                 O 
                   
                 9.2.35 
               
               
                 Load 
               
               
                 Indicator 
               
               
                 &gt;&gt;Radio 
                 O 
                   
                 9.2.37 
               
               
                 Resource 
               
               
                 Status 
               
               
                 &gt;&gt;Composite 
                 O 
                   
                 9.2.44 
                   
                 YES 
                 ignore 
               
               
                 Available 
               
               
                 Capacity 
               
               
                 Group 
               
               
                 &gt;&gt;ABS 
                 O 
                   
                 9.2.58 
                   
                 YES 
                 ignore 
               
               
                 Status 
               
               
                 &gt;&gt; UE-CSI 
                 O 
                   
                 9.2.x1 
                   
                 YES 
                 ignore 
               
               
                 Report 
               
               
                   
               
             
          
           
               
                   
                 Range bound 
                 Explanation 
               
               
                   
                   
               
               
                   
                 maxCellineNB 
                 Maximum no. cells that can be served by an eNB. Value 
               
               
                   
                   
                 is 256. 
               
               
                   
                   
               
             
          
         
       
     
         [0192]    9.2.x1 UE-CSI Report 
         [0193]    This IE provides UE-CSI information for a set of UEs served by eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE D3 
               
               
                   
               
             
             
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 UE subset CSI 
                   
                 1 . . . 
                   
                   
               
               
                 Report 
                   
                 &lt;maxUEsubsetCSIReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                 &gt;UE-CSI 
                   
                 1 . . . &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 process 
                   
                   
                   
                   
               
               
                 information 
                   
                   
                   
                   
               
               
                 &gt;Rank 
                 O 
                   
                 BIT STRING 
                 The rank indicator 
               
               
                 Indicator 
                   
                   
                 (SIZE (3)) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in 
               
               
                   
                   
                   
                   
                 the associated 
               
               
                   
                   
                   
                   
                 request. In that 
               
               
                   
                   
                   
                   
                 case Cf. TS 36.213 
               
               
                   
                   
                   
                   
                 [7.2.3]. 
               
               
                 &gt;&gt;Wideband 
                 M 
                   
                 BIT STRING 
                 Cf. TS 36.213 
               
               
                 CQI For 
                   
                   
                 (SIZE (4)) 
                 [7.2.3]. 
               
               
                 Codeword 0 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband 
                 O 
                   
                 BIT STRING 
                 Cf. TS 36.213 
               
               
                 d CQI For 
                   
                   
                 (SIZE (4)) 
                 [7.2.3]. 
               
               
                 Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;&gt;Subband 
                   
                 0 . . . &lt;maxCQISubbands&gt; 
                   
                 This IE is present 
               
               
                 CQI List 
                   
                   
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband 
                 O 
                   
                 BIT STRING 
                 Cf. TS 36.213 
               
               
                 CQI for 
                   
                   
                 (SIZE (2)) 
                 [7.2.3]. 
               
               
                 codeword 
                   
                   
                   
                   
               
               
                 0 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband 
                 O 
                   
                 BIT STRING 
                 Cf. TS 36.213 
               
               
                 CQI for 
                   
                   
                 (SIZE (2)) 
                 [7.2.3]. 
               
               
                 codeword 
                   
                   
                   
                   
               
               
                 1 
                   
                   
                   
                   
               
               
                 &gt;&gt;UE-CSI 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 process 
                   
                   
                   
                 configuration 
               
               
                 Configuration 
                   
                   
                   
                 information. 
               
               
                 information 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEsubsetCSIReport 
                 Maximum UE subset size for which UE-CSI can be reported.  
               
               
                   
                 The value is 32. 
               
               
                 maxUE-CSIProcess 
                 Maximum number of CSI processes per-UE. The value is 4. 
               
               
                 maxCQISubbands 
                 Maximum number of subbands for UE CQI reporting. 
               
               
                   
                 The value is 28. 
               
               
                   
               
             
          
         
       
     
         [0194]    Alternatively, the parameter maxUEsubsetCSIReport can be 8 or 64. Further, optionally, the UE-ID can have a more compact representation using say 8 bits or 6 bits or 5 bits (equivalently 256 or 64 or 32 possible indices from a configurable table). 
         [0195]    Next, we consider the case when subband indices have to be indicated. This is important to accommodate feedback modes that involve UE selected subband feedback. 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE D4 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 UE subset CSI Report 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEsubsetCSIReport&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 
               
               
                   
                   
                   
                   
                 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 BIT STRING 
                 The rank indicator 
               
               
                   
                   
                   
                 (SIZE (3)) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in 
               
               
                   
                   
                   
                   
                 the associated 
               
               
                   
                   
                   
                   
                 request. In that 
               
               
                   
                   
                   
                   
                 case Cf. TS 36.213 
               
               
                   
                   
                   
                   
                 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 BIT STRING 
                   
               
               
                 Codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 BIT STRING 
                   
               
               
                 Codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . . &lt;maxCQISubbands&gt; 
                   
                 This IE is present 
               
               
                   
                   
                   
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 BIT STRING 
                   
               
               
                 codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 BIT STRING 
                   
               
               
                 codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;Subband index 
                 O 
                   
                 INTEGER 
                 Included in case of 
               
               
                   
                   
                   
                 (0 . . . 27, . . . ) 
                 UE selected 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 Configuration 
                   
                   
                   
                 configuration 
               
               
                 information 
                   
                   
                   
                 information. 
               
               
                   
               
             
          
         
       
     
         [0196]    Note that as an alternative in the above tables, for each CQI the bit string field of 4 bits (2 bits) can be replaced by INTEGER (0 . . . 15, . . . ) (INTEGER (0 . . . 7, . . . )). 
         [0197]    In another alternative the sub band indices can be conveyed by means of a combinatorial index which is described next. 
         [0198]    The idea here is that depending on the number of PRBs (or RBs for short) in the downlink available at sending eNB 2  (a parameter which is known or conveyed separately to the receiving eNB 1 ), the set of all possible subband selections that can be made together with the subband size for each feedback mode can be deduced by eNB 1 . 
         [0199]    For example when 110 RBs are available at eNB 2  (and this number is conveyed to eNB 1 ) eNB 1  can deduce that for a UE configured under: 
         [0200]    Aperiodic, Mode 2-*: 6 UE selected subband indices 
         [0201]    A subframe is composed of 28 subbands. Among 28 subbands, 6 subbands are selected by the UE. The number of PRBs in the subbands is 4 except for the last one; the number of PRBs in the last subband is 2 (4*27+2=110). 
         [0202]    For Aperiodic, Mode 3-*: 14 higher layer-configured sub bands 
         [0203]    A subframe is composed of 14 subbands. The number of PRBs in the subband is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0204]    For Periodic, Mode 2-*: 4 UE selected subband indices (with an additional constraint on choosing one sub band per bandwidth portion or part) 
         [0205]    A subframe is composed of 14 subbands. Among 14 subbands, 4 subbands are selected by the UE. The number of PRBs in the subbands is 8 except for the last one; the number of PRBs in the last subband is 6 (8*13+6=110). 
         [0206]    Then, considering all possible feasible subband selections under all the aforementioned feedback modes, it is possible to assign a unique label to each distinct feasible selection of sub bands. All possible such labels together decide the range of a combinatorial index R. As a result, knowing the value of R the receiving eNB can deduce the subband selection. The associated CQIs (one for each subband in the indicated selection) can be ordered in the increasing order of the frequency range represented by the indicated subbands. Each such CQI can be conveyed using full representation (i.e., using 16 possibilities) which can then be directly used by the receiving eNB 1 . 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE D5 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 UE subset CSI Report 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEsubsetCSIReport&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE (16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                   
                   
                   
                   
                 Defined in TS 
               
               
                   
                   
                   
                   
                 36.331. 
               
               
                 &gt;UE-CSI process 
                   
                 1 . . .  
                   
                   
               
               
                 information 
                   
                 &lt;maxUE-CSIprocess&gt; 
                   
                   
               
               
                 &gt;&gt;Rank Indicator 
                 O 
                   
                 BIT STRING 
                 The rank indicator 
               
               
                   
                   
                   
                 (SIZE (3)) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in 
               
               
                   
                   
                   
                   
                 the associated 
               
               
                   
                   
                   
                   
                 request. In that 
               
               
                   
                   
                   
                   
                 case Cf. TS 36.213 
               
               
                   
                   
                   
                   
                 [7.2.3]. 
               
               
                 &gt;&gt;Wideband CQI For 
                 M 
                   
                 BIT STRING 
                   
               
               
                 Codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;Wideband CQI For 
                 O 
                   
                 BIT STRING 
                   
               
               
                 Codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt; combinatorial  
                 O 
                   
                 Integer FFS  
                 This IE is present 
               
               
                 index 
                   
                   
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 0 . . . &lt;maxCQISubbands&gt; 
                   
                 The number of 
               
               
                   
                   
                   
                   
                 subbands in the list 
               
               
                   
                   
                   
                   
                 as well as their 
               
               
                   
                   
                   
                   
                 respective indices 
               
               
                   
                   
                   
                   
                 and sizes are 
               
               
                   
                   
                   
                   
                 deduced from the 
               
               
                   
                   
                   
                   
                 combinatorial index. 
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 M 
                   
                 BIT STRING 
                   
               
               
                 for codeword 0 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 BIT STRING 
                   
               
               
                 for codeword 1 
                   
                   
                 (SIZE (4)) 
                   
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                   
                 FFS 
                 CSI process 
               
               
                 Configuration 
                   
                   
                   
                 configuration 
               
               
                 information 
                   
                   
                   
                 information. 
               
               
                   
               
             
          
         
       
     
         [0207]    UE Configuration Independent Coding Structure 
         [0208]    A coding structure for signaling CSI over X2 in a UE-configuration independent way is shown in Table I1. In this structure, a subband is defined as a set of contiguous PRBs having the same CQI value. The subband partitioning is left to the sending eNB 2  implementation, and is not restricted by the UE&#39;s CSI reporting configuration. Each indicated CQI follows the definition of a 4 bit CQI (Cf. TS 36.213). This allows for the sending eNB 2  to process the CSI it receives from the UE in any manner as long as each indicated CQI is consistent with the basic CQI definition. The receiving eNB 1  can directly use these CQIs while being agnostic to how they were procured and processed by eNB 1 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE D6 
               
             
             
               
                   
               
               
                 UE configuration independent coding structure 
               
             
          
           
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxnoofUE-CSI&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (16)) 
                   
               
               
                 &gt;CSI per Interference 
                   
                 1 . . .  
                   
                   
               
               
                 Hypotheses 
                   
                 &lt;maxnoofInterferenceHypothesis&gt; 
                   
                   
               
               
                 &gt;&gt;Interference Hypothesis 
                 M 
                   
                 [FFS] 
                   
               
               
                 Information 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 M 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 0 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 O 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 1 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;Rank Indication 
                 M 
                   
                 INTEGER(1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                 Subbands are listed 
               
               
                   
                   
                 &lt;maxnoofSubband&gt; 
                   
                 in the order of 
               
               
                   
                   
                   
                   
                 increasing 
               
               
                   
                   
                   
                   
                 frequency. 
               
               
                 &gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER(0 . . .  
                 PRB number of the 
               
               
                   
                   
                   
                 109, . . . ) 
                 first PRB in the 
               
               
                   
                   
                   
                   
                 subband. If this IE is 
               
               
                   
                   
                   
                   
                 not present, the 
               
               
                   
                   
                   
                   
                 subband is 
               
               
                   
                   
                   
                   
                 contiguous with the 
               
               
                   
                   
                   
                   
                 previous subband in 
               
               
                   
                   
                   
                   
                 the list, or starts 
               
               
                   
                   
                   
                   
                 with PRB 0 if this is 
               
               
                   
                   
                   
                   
                 the first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 O 
                   
                 INTEGER(1 . . .  
                 Number of 
               
               
                   
                   
                   
                 110, . . . ) 
                 contiguous PRBs in 
               
               
                   
                   
                   
                   
                 the subband. If this 
               
               
                   
                   
                   
                   
                 IE is not present, 
               
               
                   
                   
                   
                   
                 the value is the 
               
               
                   
                   
                   
                   
                 same as the 
               
               
                   
                   
                   
                   
                 previous subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 M 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 0 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 1 
                   
                   
                 15, . . . ) 
               
               
                   
               
             
          
         
       
     
         [0209]    We note here that reporting full (complete) CQI (with 16 possibilities) for each indicated subband CQI instead of differential CQI is useful since otherwise the receiving eNB 1  may not know how to combine a corresponding wideband CQI and differential sub-band CQI (with fewer than 16 possibilities) in order to obtain the full CQI for that subband, for instance, in the case that the precise feedback mode configured for the UE of interest under that CSI process is not conveyed to the receiving eNB 1 . We note here also that it might be desirable to not impose restrictions on sending eNB 2  on how it combines reports from multiple different feedback modes configured for that UE under the same CSI process. Then, note that when aperiodic feedback mode 3-1 is configured for the UE (by eNB 2 ), the UE reported sub band CQI is encoded differentially with respect to the corresponding wideband CQI using 2 bits representing differential values {−2, 0, 1, 2}. On the other hand, in the case of aperiodic feedback mode 2-0 or 2-2, only the best M-average is reported by the UE by differentially encoding it with respect to a corresponding wideband CQI using 2 bits representing differential values {1, 2, 3, 4}. Further, in case of periodic feedback mode 2-1 the CQI corresponding to codeword-1 for each UE selected subband within a bandwidth part can itself be of 4 bits, whereas that of codeword-2 (when RI&gt;1) is differentially encoded with respect to CQI of codeword-1 using 3 bits. 
         [0210]    It becomes apparent from the above discussion that a transparent way of conveying CQI (without having to convey all details regarding to one or more feedback modes configured under that CSI process for that UE) is to allow for full (complete) CQI for each indicated subband. 
         [0211]    Another issue that is important, is to ensure that the RI and CQIs conveyed by eNB 2  to eNB 1  in a UE CSI report are mutually consistent, i.e., all the reported CQIs are computed by the UE for the same RI (which is identical to the one in the Rank Indication IE when the latter is present). This issue is important to address because under certain feedback modes (such as periodic mode 2-1) the RI and the wideband CQI(s) as well as the subband CQI(s) for one or more bandwidth portions can be reported by the UE on different subframes. Thus, depending on the periodicity defined by eNB 1  in its CSI request, it can happen that the latest RI available for the UE under the CSI process, can be different from the one for which the most recent CQI(s) are computed. In such a case, the sending eNB 2  should ensure that its CSI report is consistent, for instance by using the RI value for which the most recently available CQI(s) have been computed. 
         [0212]    The variation (which allows the requesting eNB to specify whether or not it wants to receive subband CQI(s) or Rank Indication is provided below. In this context, we note that since the requesting eNB 1  has no control over how eNB 2  configures CSI processes (and constituent feedback modes) for its users, it should be in any case able to exploit different type of CSI reports (wideband only or wideband and subband). 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE D7 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 CSI per UE 
                   
                 1 . . . &lt;maxnoofUE- 
                   
                   
               
               
                   
                   
                 CSI&gt; 
                   
                   
               
               
                 &gt;C-RNTI 
                 M 
                   
                 BIT STRING 
                   
               
               
                   
                   
                   
                 (SIZE (16)) 
                   
               
               
                 &gt;CSI per Interference 
                   
                 1 . . .  
                   
                   
               
               
                 Hypotheses 
                   
                 &lt;maxnoofInterferenceHypothesis&gt; 
                   
                   
               
               
                 &gt;&gt;Interference Hypothesis M 
                   
                   
                 [FFS] 
                   
               
               
                 Information 
                   
                   
                   
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 M 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 0 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;Wideband CQI for 
                 O 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 1 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;Rank Indication 
                 O 
                   
                 INTEGER(1 . . .  
                 The rank indication 
               
               
                   
                   
                   
                 8, . . . ) 
                 IE is present only if 
               
               
                   
                   
                   
                   
                 it is requested in the 
               
               
                   
                   
                   
                   
                 associated request. 
               
               
                   
                   
                   
                   
                 In that case it 
               
               
                   
                   
                   
                   
                 follows the definition 
               
               
                   
                   
                   
                   
                 in TS 36.213 [11]. 
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                 This IE is present 
               
               
                   
                   
                 &lt;maxnoofSubband&gt; 
                   
                 only if associated 
               
               
                   
                   
                   
                   
                 request wants 
               
               
                   
                   
                   
                   
                 subband CQI. In 
               
               
                   
                   
                   
                   
                 that case subbands 
               
               
                   
                   
                   
                   
                 are listed in the 
               
               
                   
                   
                   
                   
                 order of increasing 
               
               
                   
                   
                   
                   
                 frequency. 
               
               
                 &gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER(0 . . .  
                 PRB number of the 
               
               
                   
                   
                   
                 109, . . .) 
                 first PRB in the 
               
               
                   
                   
                   
                   
                 subband. If this IE is 
               
               
                   
                   
                   
                   
                 not present, the 
               
               
                   
                   
                   
                   
                 subband is 
               
               
                   
                   
                   
                   
                 contiguous with the 
               
               
                   
                   
                   
                   
                 previous subband in 
               
               
                   
                   
                   
                   
                 the list, or starts 
               
               
                   
                   
                   
                   
                 with PRB 0 if this is 
               
               
                   
                   
                   
                   
                 the first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 O 
                   
                 INTEGER(1 . . .  
                 Number of 
               
               
                   
                   
                   
                 110, . . . ) 
                 contiguous PRBs in 
               
               
                   
                   
                   
                   
                 the subband. If this 
               
               
                   
                   
                   
                   
                 IE is not present, 
               
               
                   
                   
                   
                   
                 the value is the 
               
               
                   
                   
                   
                   
                 same as the 
               
               
                   
                   
                   
                   
                 previous subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 M 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 0 
                   
                   
                 15, . . . ) 
                   
               
               
                 &gt;&gt;&gt;Subband CQI for 
                 O 
                   
                 INTEGER(0 . . .  
                   
               
               
                 Codeword 1 
                   
                   
                 15, . . . ) 
               
               
                   
               
             
          
         
       
     
         [0213]    Another variation which allows for further simplification at the expense of not being bit efficient is as follows. Here the full CQIs for all possible subbands (which can be determined by the number of PRBs in the downlink available at eNB 2 ) are always conveyed for a UE under the CSI process. In case the sub band CQI is not reported by a UE under the configured feedback mode for a subband, the sending eNB 2  simply uses the wideband CQI value for that subband. 
         [0214]    9.2.19 Relative Narrowband Tx Power (RNTP) 
         [0215]    This IE provides an indication on DL power restriction per PRB in a cell and other information needed by a neighbour eNB for interference aware scheduling. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE D8 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP Per 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB 
                   
                   
                 STRING 
                 the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 n PRB  value (i.e. 
               
               
                   
                   
                   
                   
                 first bit = PRB 0 
               
               
                   
                   
                   
                   
                 and so on), for 
               
               
                   
                   
                   
                   
                 which the bit 
               
               
                   
                   
                   
                   
                 value 
               
               
                   
                   
                   
                   
                 represents 
               
               
                   
                   
                   
                   
                 RNTP (n PRB ), 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 
               
               
                   
                   
                   
                   
                 indicates “Tx not 
               
               
                   
                   
                   
                   
                 exceeding 
               
               
                   
                   
                   
                   
                 RNTP 
               
               
                   
                   
                   
                   
                 threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 
               
               
                   
                   
                   
                   
                 indicates “no 
               
               
                   
                   
                   
                   
                 promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. 
               
               
                   
                   
                   
                   
                 This IE is used 
               
               
                   
                   
                   
                   
                 to indicate DL 
               
               
                   
                   
                   
                   
                 power restriction 
               
               
                   
                   
                   
                   
                 per PRB for the 
               
               
                   
                   
                   
                   
                 first subframe. 
               
               
                   
                   
                   
                   
                 In case the DL 
               
               
                   
                   
                   
                   
                 power restriction 
               
               
                   
                   
                   
                   
                 is static, the 
               
               
                   
                   
                   
                   
                 indicated DL 
               
               
                   
                   
                   
                   
                 power restriction 
               
               
                   
                   
                   
                   
                 is maintained 
               
               
                   
                   
                   
                   
                 over the 
               
               
                   
                   
                   
                   
                 subsequent 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, 
                 defined in TS 
               
               
                   
                   
                   
                 −11, −10, −9, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −8, −7, −6, −5, 
               
               
                   
                   
                   
                 −4, −3, −2, −1, 
               
               
                   
                   
                   
                 0, 1, 2, 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports 
               
               
                 Antenna 
                   
                   
                   
                 for cell-specific 
               
               
                 Ports 
                   
                   
                   
                 reference 
               
               
                   
                   
                   
                   
                 signals) defined 
               
               
                   
                   
                   
                   
                 in TS 36.211 
               
               
                   
                   
                   
                   
                 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 TS 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted 
               
               
                 Impact 
                   
                   
                   
                 Number Of 
               
               
                   
                   
                   
                   
                 Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see 
               
               
                   
                   
                   
                   
                 TS 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means 
               
               
                   
                   
                   
                   
                 “no prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 Extended 
                 O 
                   
                 BIT 
                 Each position in 
               
               
                 RNTP Per 
                   
                   
                 STRING 
                 the bitmap 
               
               
                 PRB 
                   
                   
                 (6 . . . 4290, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 PRB in a 
               
               
                   
                   
                   
                   
                 subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates ‘no 
               
               
                   
                   
                   
                   
                 promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given’ and value 
               
               
                   
                   
                   
                   
                 “0” indicates ‘Tx 
               
               
                   
                   
                   
                   
                 not exceeding 
               
               
                   
                   
                   
                   
                 RNTP 
               
               
                   
                   
                   
                   
                 threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, the 
               
               
                   
                   
                   
                   
                 second bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 extended RNTP 
               
               
                   
                   
                   
                   
                 per PRB IE is 
               
               
                   
                   
                   
                   
                 valid, and so on. 
               
               
                   
                   
                   
                   
                 The length of 
               
               
                   
                   
                   
                   
                 the bit string is 
               
               
                   
                   
                   
                   
                 an integer 
               
               
                   
                   
                   
                   
                 (maximum 39) 
               
               
                   
                   
                   
                   
                 multiple of N RB   DL  . 
               
               
                   
                   
                   
                   
                 N RB   DL  is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string 
               
               
                   
                   
                   
                   
                 may span 
               
               
                   
                   
                   
                   
                 across multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern 
               
               
                   
                   
                   
                   
                 across 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes 
               
               
                   
                   
                   
                   
                 (formed by 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 and extended 
               
               
                   
                   
                   
                   
                 RNTP per PRB) 
               
               
                   
                   
                   
                   
                 is continuously 
               
               
                   
                   
                   
                   
                 repeated. 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB start 
               
               
                 time 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . . ) 
                 frame containing 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 number, within 
               
               
                 Index 
                   
                   
                   
                 the radio frame 
               
               
                   
                   
                   
                   
                 indicated by the 
               
               
                   
                   
                   
                   
                 Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                   
               
             
          
         
       
     
         [0216]    An alternate Table for RNTP enhancement is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE D9 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP per PRB 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                   
                   
                   
                 STRING 
                 the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 n PRB  value (i.e. 
               
               
                   
                   
                   
                   
                 first bit = PRB 0 
               
               
                   
                   
                   
                   
                 and so on), for 
               
               
                   
                   
                   
                   
                 which the bit 
               
               
                   
                   
                   
                   
                 value 
               
               
                   
                   
                   
                   
                 represents 
               
               
                   
                   
                   
                   
                 RNTP (n PRB ), 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 
               
               
                   
                   
                   
                   
                 indicates “Tx not 
               
               
                   
                   
                   
                   
                 exceeding 
               
               
                   
                   
                   
                   
                 RNTP 
               
               
                   
                   
                   
                   
                 threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 
               
               
                   
                   
                   
                   
                 indicates “no 
               
               
                   
                   
                   
                   
                 promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. 
               
               
                   
                   
                   
                   
                 This IE is 
               
               
                   
                   
                   
                   
                 ignored if the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is present. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, 
                 defined in TS 
               
               
                   
                   
                   
                 −11, −10, −9, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −8, −7, −6, −5, 
               
               
                   
                   
                   
                 −4, −3, −2, −1, 
               
               
                   
                   
                   
                 0, 1, 2, 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports 
               
               
                 Antenna Ports 
                   
                   
                   
                 for cell-specific 
               
               
                   
                   
                   
                   
                 reference 
               
               
                   
                   
                   
                   
                 signals) defined 
               
               
                   
                   
                   
                   
                 in TS 36.211 
               
               
                   
                   
                   
                   
                 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 TS 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted 
               
               
                 Impact 
                   
                   
                   
                 Number Of 
               
               
                   
                   
                   
                   
                 Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see 
               
               
                   
                   
                   
                   
                 TS 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means 
               
               
                   
                   
                   
                   
                 “no prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 RNTP Per 
                 O 
                   
                 BIT 
                 Each position in 
               
               
                 PRB per 
                   
                   
                 STRING 
                 the bitmap 
               
               
                 subframe 
                   
                   
                 (6 . . . 4400, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 PRB in a 
               
               
                   
                   
                   
                   
                 subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates ‘no 
               
               
                   
                   
                   
                   
                 promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given’ and value 
               
               
                   
                   
                   
                   
                 “0” indicates ‘Tx 
               
               
                   
                   
                   
                   
                 not exceeding 
               
               
                   
                   
                   
                   
                 RNTP 
               
               
                   
                   
                   
                   
                 threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is valid, the 
               
               
                   
                   
                   
                   
                 second bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is valid, and so 
               
               
                   
                   
                   
                   
                 on. 
               
               
                   
                   
                   
                   
                 The length of 
               
               
                   
                   
                   
                   
                 the bit string is 
               
               
                   
                   
                   
                   
                 an integer 
               
               
                   
                   
                   
                   
                 (maximum 40) 
               
               
                   
                   
                   
                   
                 multiple of N RB   DL . 
               
               
                   
                   
                   
                   
                 N RB   DL  is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string 
               
               
                   
                   
                   
                   
                 may span 
               
               
                   
                   
                   
                   
                 across multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern 
               
               
                   
                   
                   
                   
                 across 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes 
               
               
                   
                   
                   
                   
                 formed by 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is continuously 
               
               
                   
                   
                   
                   
                 repeated. 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB per 
               
               
                 subframe 
               
               
                 start time 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . . ) 
                 frame containing 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 number, within 
               
               
                 Index 
                   
                   
                   
                 the radio frame 
               
               
                   
                   
                   
                   
                 indicated by the 
               
               
                   
                   
                   
                   
                 Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                   
               
             
          
         
       
     
         [0217]    Another alternate Table for RNTP enhancement is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE D10 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP per PRB 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                   
                   
                   
                 STRING 
                 the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 n PRB  value (i.e. 
               
               
                   
                   
                   
                   
                 first bit = PRB 0 
               
               
                   
                   
                   
                   
                 and so on), for 
               
               
                   
                   
                   
                   
                 which the bit 
               
               
                   
                   
                   
                   
                 value 
               
               
                   
                   
                   
                   
                 represents 
               
               
                   
                   
                   
                   
                 RNTP (n PRB ), 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 
               
               
                   
                   
                   
                   
                 indicates “Tx not 
               
               
                   
                   
                   
                   
                 exceeding 
               
               
                   
                   
                   
                   
                 RNTP 
               
               
                   
                   
                   
                   
                 threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 
               
               
                   
                   
                   
                   
                 indicates “no 
               
               
                   
                   
                   
                   
                 promise on the 
               
               
                   
                   
                   
                   
                 Tx power is 
               
               
                   
                   
                   
                   
                 given”. 
               
               
                   
                   
                   
                   
                 This IE is 
               
               
                   
                   
                   
                   
                 ignored if the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is present. 
               
               
                 RNTP 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                   
                 (−∞, 
                 defined in TS 
               
               
                   
                   
                   
                 −11, −10, −9, 
                 36.213 [11]. 
               
               
                   
                   
                   
                 −8, −7, −6, −5, 
               
               
                   
                   
                   
                 −4, −3, −2, −1, 
               
               
                   
                   
                   
                 0, 1, 2, 3, . . . ) 
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . . ) 
                 antenna ports 
               
               
                 Antenna Ports 
                   
                   
                   
                 for cell-specific 
               
               
                   
                   
                   
                   
                 reference 
               
               
                   
                   
                   
                   
                 signals) defined 
               
               
                   
                   
                   
                   
                 in TS 36.211 
               
               
                   
                   
                   
                   
                 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . . ) 
                 TS 36.213 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . . ) 
                 Predicted 
               
               
                 Impact 
                   
                   
                   
                 Number Of 
               
               
                   
                   
                   
                   
                 Occupied 
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
               
               
                   
                   
                   
                   
                 Symbols (see 
               
               
                   
                   
                   
                   
                 TS 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means 
               
               
                   
                   
                   
                   
                 “no prediction is 
               
               
                   
                   
                   
                   
                 available”. 
               
               
                 RNTP Per 
                 O 
                   
                 BIT 
                 Each position in 
               
               
                 PRB per 
                   
                   
                 STRING 
                 the bitmap 
               
               
                 subframe 
                   
                   
                 (6 . . . 4400, . . . ) 
                 represents a 
               
               
                   
                   
                   
                   
                 PRB in a 
               
               
                   
                   
                   
                   
                 subframe, for 
               
               
                   
                   
                   
                   
                 which value “1” 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 ‘resource with no 
               
               
                   
                   
                   
                   
                 utilization 
               
               
                   
                   
                   
                   
                 constraints’ and 
               
               
                   
                   
                   
                   
                 value “0” 
               
               
                   
                   
                   
                   
                 indicates 
               
               
                   
                   
                   
                   
                 ‘interference 
               
               
                   
                   
                   
                   
                 protected 
               
               
                   
                   
                   
                   
                 resource.’ 
               
               
                   
                   
                   
                   
                 The first bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is valid, the 
               
               
                   
                   
                   
                   
                 second bit 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 PRB 1 of the 
               
               
                   
                   
                   
                   
                 first subframe 
               
               
                   
                   
                   
                   
                 for which the 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is valid, and so 
               
               
                   
                   
                   
                   
                 on. 
               
               
                   
                   
                   
                   
                 The length of 
               
               
                   
                   
                   
                   
                 the bit string is 
               
               
                   
                   
                   
                   
                 an integer 
               
               
                   
                   
                   
                   
                 (maximum 40) 
               
               
                   
                   
                   
                   
                 multiple of N RB   DL . 
               
               
                   
                   
                   
                   
                 N RB   DL  is 
               
               
                   
                   
                   
                   
                 defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string 
               
               
                   
                   
                   
                   
                 may span 
               
               
                   
                   
                   
                   
                 across multiple 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern 
               
               
                   
                   
                   
                   
                 across 
               
               
                   
                   
                   
                   
                 contiguous 
               
               
                   
                   
                   
                   
                 subframes 
               
               
                   
                   
                   
                   
                 formed by 
               
               
                   
                   
                   
                   
                 RNTP per PRB 
               
               
                   
                   
                   
                   
                 per subframe IE 
               
               
                   
                   
                   
                   
                 is continuously 
               
               
                   
                   
                   
                   
                 repeated. 
               
               
                 RNTP per 
                   
                 0 . . . 1 
               
               
                 PRB per 
               
               
                 subframe 
               
               
                 start time 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
               
               
                 SFN 
                   
                   
                 (0 . . . 1023, . . . ) 
                 frame containing 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe 
               
               
                 Subframe 
                   
                   
                 (0 . . . 9, . . . ) 
                 number, within 
               
               
                 Index 
                   
                   
                   
                 the radio frame 
               
               
                   
                   
                   
                   
                 indicated by the 
               
               
                   
                   
                   
                   
                 Start SFN IE, of 
               
               
                   
                   
                   
                   
                 the first subframe 
               
               
                   
                   
                   
                   
                 when the RNTP 
               
               
                   
                   
                   
                   
                 Per PRB Per 
               
               
                   
                   
                   
                   
                 Subframe IE is 
               
               
                   
                   
                   
                   
                 valid. 
               
               
                   
               
             
          
         
       
     
         [0218]    Another alternative using multiple thresholds conveyed via 2 bits is given below. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE D11 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 ERNTP Per 
                 M 
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                 PRB and 
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                 subframe 
                   
                 (12 . . . 220, . . .) 
                 represents a 
                   
                   
               
               
                   
                   
                   
                 PRB in a 
                   
                   
               
               
                   
                   
                   
                 subframe, for 
                   
                   
               
               
                   
                   
                   
                 which the value 
                   
                   
               
               
                   
                   
                   
                 “xx” indicates 
                   
                   
               
               
                   
                   
                   
                 how the 
                   
                   
               
               
                   
                   
                   
                 transmission 
                   
                   
               
               
                   
                   
                   
                 power in a 
                   
                   
               
               
                   
                   
                   
                 resource block 
                   
                   
               
               
                   
                   
                   
                 is mapped 
                   
                   
               
               
                   
                   
                   
                 relative to the 
                   
                   
               
               
                   
                   
                   
                 two power 
                   
                   
               
               
                   
                   
                   
                 thresholds: 
                   
                   
               
               
                   
                   
                   
                 00 - power level 
                   
                   
               
               
                   
                   
                   
                 not exceeding 
                   
                   
               
               
                   
                   
                   
                 the LPTH 
                   
                   
               
               
                   
                   
                   
                 01 - power level 
                   
                   
               
               
                   
                   
                   
                 between LPTH 
                   
                   
               
               
                   
                   
                   
                 and MPTH; 
                   
                   
               
               
                   
                   
                   
                 10 - power level 
                   
                   
               
               
                   
                   
                   
                 between MPTH 
                   
                   
               
               
                   
                   
                   
                 and HPTH; 
                   
                   
               
               
                   
                   
                   
                 11 - no promise 
                   
                   
               
               
                   
                   
                   
                 on the Tx power 
                   
                   
               
               
                   
                   
                   
                 is given. 
                   
                   
               
               
                   
                   
                   
                 The first 2 bits 
                   
                   
               
               
                   
                   
                   
                 correspond to 
                   
                   
               
               
                   
                   
                   
                 PRB 0 of the 
                   
                   
               
               
                   
                   
                   
                 first subframe 
                   
                   
               
               
                   
                   
                   
                 for which the IE 
                   
                   
               
               
                   
                   
                   
                 is valid, the 
                   
                   
               
               
                   
                   
                   
                 following 2 bits 
                   
                   
               
               
                   
                   
                   
                 correspond to 
                   
                   
               
               
                   
                   
                   
                 PRB 1 of the 
                   
                   
               
               
                   
                   
                   
                 first subframe 
                   
                   
               
               
                   
                   
                   
                 for which the IE 
                   
                   
               
               
                   
                   
                   
                 is valid, and so 
                   
                   
               
               
                   
                   
                   
                 on. 
                   
                   
               
               
                   
                   
                   
                 The bit string 
                   
                   
               
               
                   
                   
                   
                 may span 
                   
                   
               
               
                   
                   
                   
                 across multiple 
                   
                   
               
               
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                 subframes. 
                   
                   
               
               
                   
                   
                   
                 The length of 
                   
                   
               
               
                   
                   
                   
                 the bit string is 
                   
                   
               
               
                   
                   
                   
                 an integer 
                   
                   
               
               
                   
                   
                   
                 (maximum 40) 
                   
                   
               
               
                   
                   
                   
                 multiple of. The 
                   
                   
               
               
                   
                   
                   
                 parameter is 
                   
                   
               
               
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.211 [10]. 
                   
                   
               
               
                   
                   
                   
                 The ERNTP 
                   
                   
               
               
                   
                   
                   
                 pattern is 
                   
                   
               
               
                   
                   
                   
                 continuously 
                   
                   
               
               
                   
                   
                   
                 repeated with a 
                   
                   
               
               
                   
                   
                   
                 periodicity 
                   
                   
               
               
                   
                   
                   
                 indicated in 
                   
                   
               
               
                   
                   
                   
                 Periodicity. 
                   
                   
               
               
                 Transmitted 
                   
                   
                   
                   
                   
               
               
                 power levels 
                   
                   
                   
                   
                   
               
               
                 LPTH (Low 
                 M 
                 ENUMERATED 
                 Lower RNTP 
                 — 
                 — 
               
               
                 Power 
                   
                 (−∞, −11, 
                 power 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 threshold, using 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 the 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.213 [11]. 
                   
                   
               
               
                 MPTH 
                 M 
                 ENUMERATED 
                 Medium RNTP 
                   
                   
               
               
                 (Medium 
                   
                 (−∞, −11, 
                 power 
                   
                   
               
               
                 Power 
                   
                 −10, −9, −8, 
                 threshold, using 
                   
                   
               
               
                 Threshold) 
                   
                 −7, −6, −5, −4, 
                 the 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.213 [11]. 
                   
                   
               
               
                 HPTH (High 
                 M 
                 ENUMERATED 
                 Higher RNTP 
                   
                   
               
               
                 Power 
                   
                 (−∞, −11, 
                 power 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 threshold, using 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 the RNTP threshold   
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 defined in TS 
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 36.213 [11]. 
                   
                   
               
               
                 Subframe 
                   
                   
                   
                   
                   
               
               
                 sequence 
                   
                   
                   
                   
                   
               
               
                 definition 
                   
                   
                   
                   
                   
               
               
                 &gt;Start SFN 
                 M 
                 INTEGER 
                 SFN of the radio 
                   
                   
               
               
                   
                   
                 (0 . . . 1023) 
                 frame 
                   
                   
               
               
                   
                   
                   
                 containing the 
                   
                   
               
               
                   
                   
                   
                 first subframe 
                   
                   
               
               
                   
                   
                   
                 where the 
                   
                   
               
               
                   
                   
                   
                 RNTP Per PRB 
                   
                   
               
               
                   
                   
                   
                 Per Subframe 
                   
                   
               
               
                   
                   
                   
                 IE is valid. 
                   
                   
               
               
                 &gt;Start 
                 M 
                 INTEGER 
                 Subframe 
                   
                   
               
               
                 Subframe 
                   
                 (0 . . . 39) 
                 number, within 
                   
                   
               
               
                 Number 
                   
                   
                 the radio frame 
                   
                   
               
               
                   
                   
                   
                 indicated by the 
                   
                   
               
               
                   
                   
                   
                 Start SFN IE, of 
                   
                   
               
               
                   
                   
                   
                 the first 
                   
                   
               
               
                   
                   
                   
                 subframe when 
                   
                   
               
               
                   
                   
                   
                 the RNTP Per 
                   
                   
               
               
                   
                   
                   
                 PRB Per 
                   
                   
               
               
                   
                   
                   
                 Subframe IE is 
                   
                   
               
               
                   
                   
                   
                 valid. 
                   
                   
               
               
                 No. of 
                 M 
                 1 . . . 40 
                 No. of 
                   
                   
               
               
                 subframes 
                   
                   
                 subframes for 
                   
                   
               
               
                   
                   
                   
                 which is defined 
                   
                   
               
               
                   
                   
                   
                 the bitstream 
                   
                   
               
               
                 Periodicity 
                   
                 1 . . . 40 
                 The number of 
                   
                   
               
               
                   
                   
                   
                 subframes after 
                   
                   
               
               
                   
                   
                   
                 which the bit 
                   
                   
               
               
                   
                   
                   
                 pattern is 
                   
                   
               
               
                   
                   
                   
                 repeated 
                   
                   
               
               
                 Number Of 
                 M 
                 ENUMERATED 
                 P (number of 
                   
                   
               
               
                 Cell-specific 
                   
                 (1, 2, 4, . . .) 
                 antenna ports 
                   
                   
               
               
                 Antenna Ports 
                   
                   
                 for cell-specific 
                   
                   
               
               
                   
                   
                   
                 reference 
                   
                   
               
               
                   
                   
                   
                 signals) defined 
                   
                   
               
               
                   
                   
                   
                 in TS 36.211 
                   
                   
               
               
                   
                   
                   
                 [10] 
                   
                   
               
               
                 P_B 
                 M 
                 INTEGER 
                 P B  is defined in 
                   
                   
               
               
                   
                   
                 (0 . . . 3, . . .) 
                 TS 36.213 [11]. 
               
               
                   
               
             
          
         
       
     
         [0219]    The point in the table given above is that since the choice ‘11’ already indicates no promise on the power level (which covers the case of transmit power being arbitrarily high) we can use three thresholds (instead of two) since there is no need to convey that the power level is greater than HPTH (as this is subsumed by ‘11’). 
         [0220]    However, one problem with indicating multiple thresholds is that the current CoMP hypothesis (implicitly) assumes just one threshold. In this sense there is a mismatch between using multiple thresholds in eRNTP and not in the CoMP hypothesis. Consequently, the full potential of multiple thresholds may not be realized inspire of the additional overhead. 
         [0221]    Suppose that there are L subband selection types denoted by {(N 1 , q 1 ), . . . , (N L , q L )}, where the l th  selection type is defined by N l , q l  which denote the total number of subbands and the number of subbands that must be selected, respectively, under that type. Note that under each selection type the size of each subband is fixed and known a-priori. Further, suppose that there are J bandwidth portions, each portion comprising S j , 1≦j≦J subbands. Only one subband is selected from the S j  subbands in each bandwidth portion jε{1, . . . , J}. Further since the user sequentially reports its CSI report for the bandwidth portions, we can impose a nested structure on the corresponding exchange of CSI from sending eNB 2  to receiving eNB 1 . In particular, we impose the structure under which the CSI of any subband in the j th  portion is sent only if the CSI of a subband in each of the preceeding j−1 bandwidth portions are sent. This structure enables efficient exchange of CSI without any loss of generality. Thus, overall there are L+J different selection types possible (with the last J types associated with the selections from bandwidth portions). Then, each selection in the total number of distinct subband selections can be identified by a combinatorial index R whose range is given by 
         [0000]    
       
         
           
             0 
             , 
             … 
              
             
                 
             
             , 
             
               
                 
                   ∑ 
                   
                     j 
                     = 
                     1 
                   
                   L 
                 
                  
                 
                   ( 
                   
                     
                       
                         
                           N 
                           j 
                         
                       
                     
                     
                       
                         
                           q 
                           j 
                         
                       
                     
                   
                   ) 
                 
               
               + 
               
                 ( 
                 
                   
                     ∑ 
                     
                       j 
                       = 
                       1 
                     
                     J 
                   
                    
                   
                     
                       ∏ 
                       
                         k 
                         = 
                         1 
                       
                       j 
                     
                      
                     
                       S 
                       k 
                     
                   
                 
                 ) 
               
               - 
               1. 
             
           
         
       
     
         [0000]    We next discuss the generation of the index at the sending eNB followed by the determination of the particular selection from the index at the receiving eNB. Towards this end, we define a set of offsets as follows: 
         [0000]    
       
         
           
             
               
                 O 
                 l 
               
               = 
               
                 
                   O 
                   
                     l 
                     - 
                     1 
                   
                 
                 + 
                 
                   ( 
                   
                     
                       
                         
                           N 
                           
                             l 
                             - 
                             1 
                           
                         
                       
                     
                     
                       
                         
                           q 
                           
                             l 
                             - 
                             1 
                           
                         
                       
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
         [0000]    l=2, . . . , L+1 and O 1 =0. Further, we set O l =O l-1 +Π j=1   l-L-1 S j , l=L+2, . . . , L+J. 
         [0222]    Generation of Index at Sending eNB
       At the sending eNB, first identify the selection type l.   If lε{1, . . . , L} then q l  subbands are selected from N l  total subbands. Let m 0 , . . . , m q     l     -1  be the selected subband indices that are ordered, i.e., m 0 &lt;m 1 &lt; . . . &lt;m q     l     -1  and all lie in {1, . . . , N l }. Set       
 
         [0000]    
       
         
           
             R 
             = 
             
               
                 O 
                 l 
               
               + 
               
                 
                   ∑ 
                   
                     j 
                     = 
                     0 
                   
                   
                     
                       q 
                       l 
                     
                     - 
                     1 
                   
                 
                  
                 
                   
                     ( 
                     
                       
                         
                           
                             
                               N 
                               l 
                             
                             - 
                             
                               m 
                               j 
                             
                           
                         
                       
                       
                         
                           
                             
                               q 
                               l 
                             
                             - 
                             j 
                           
                         
                       
                     
                     ) 
                   
                   . 
                 
               
             
           
         
       
       
         
           
             Else lε{L+1, . . . , L+J}. Let m 1 , . . . , m l-L  denote the chosen subband indices, one from each of the first l−L bandwidth portions, and where m j ε{1 . . . , S j }, j=1, . . . l−L. Set R=O l +Π j=1   l-L m j −1. 
           
         
       
     
         [0226]    Retrieving Subband Selection from Index at Receiving eNB
       At the receiving eNB, find the greatest l such that O l ≦R.   If lε{1, . . . , L} then q l  subbands have been selected from N l  total subbands. Let m 0 , . . . , m q     l     -1  be the ordered subband indices that need to be determined. Initialize a=1, r=R−O l .   For k=0, . . . , q l −1 Do   b=a,       
 
         [0000]    
       
         
           
             Q 
             = 
             
               
                 ( 
                 
                   
                     
                       
                         
                           N 
                           l 
                         
                         - 
                         b 
                       
                     
                   
                   
                     
                       
                         
                           q 
                           l 
                         
                         - 
                         k 
                       
                     
                   
                 
                 ) 
               
               . 
             
           
         
       
       
         
           
             While Q&gt;r Do: b=b+1 and 
           
         
       
     
         [0000]    
       
         
           
             Q 
             = 
             
               
                 ( 
                 
                   
                     
                       
                         
                           N 
                           l 
                         
                         - 
                         b 
                       
                     
                   
                   
                     
                       
                         
                           q 
                           l 
                         
                         - 
                         k 
                       
                     
                   
                 
                 ) 
               
                
               
                 : 
               
             
           
         
       
     
       EndWhile 
       [0000]    
       
         
           
             m k =b, a=b+1, r=r−Q. 
             Else lε{L+1, . . . , L+J}. Let m 1 , . . . , m l-L  denote the subband indices that need to be determined, one from each of the first l−L bandwidth portions, and where m j ε{1 . . . , S j }, j=1, . . . l−L. Set r=R−O l , B=l−L and A=S 1 × . . . ×S B . 
             For k=1, . . . , B−1 Do 
             A=A/S k , 
           
         
       
     
         [0000]    
       
         
           
             
               m 
               ^ 
             
             = 
             
               ⌊ 
               
                 r 
                 A 
               
               ⌋ 
             
           
         
       
     
         [0000]    and m k ={circumflex over (m)}+1.
       Update r=r−{circumflex over (m)}S k      m B =r+1       
 
       Embodiment E 
     E1 Introduction 
       [0238]    We summarize the 3 options for subband definition, and provide enhancements for them, together with an enhancement for eRNTP (enhanced Relative Narrowband Tx Power). 
       E2 Summary of Solutions 
       [0239]    General notes:
       All the following options allows eNB to“process” CQI (channel quality indication) values (implementation based manner) before sending over X2.   Some of the main differentiators between the options are:       
 
         [0242]    1) Simplicity, if sending eNB implementation only sends “raw” CSI (Channel State Information)→Option A, C (albeit only with the respective enhancements) 
         [0243]    2) Flexibility, if sending eNB implementation processes CSI (e.g. combines or merges overlapping Periodic and Aperiodic reports)→Option B, C 
         [0244]    Option A: Subband Index+Report Type 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E1 
               
               
                   
               
             
             
               
                 &gt;&gt;Subband  
                   
                 0 . . .  
                   
                   
               
               
                 CQI List 
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 M 
                   
                 9.2.cc 
                   
               
               
                 CQI 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 O 
                   
                 INTEGER 
                 Included in case  
               
               
                 Index 
                   
                   
                 (0 . . . 27, . . . ) 
                 of UE selected 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                 &gt;&gt;&gt; Report  
                 O 
                   
                 ENUMERATED 
                 Included in case  
               
               
                 Type 
                   
                   
                 (periodic, 
                 of UE selected 
               
               
                   
                   
                   
                 aperiodic, . . . ) 
                 subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                   
               
             
          
         
       
     
         [0245]    Notes for Option A:
       Primary Motivation: Allows serving eNB to send CSI reports over X2 with as little processing as possible   Description: The subband partitioning is fixed, based on the UE&#39;s CSI reporting configuration. The Report Type and Subtend Index IEs are used by the receiving eNB to derive the subband positions and their size and total number of subbands. The latter information is also important since it will enable receiving eNB to determine what the differential CQI conveyed for that subband means. This is because in aperiodic mode 3-0 (or 3-1) and aperiodic mode 2-0 (or 2-2) the same differential value can be mapped to different offsets, respectively. Thus, the only way the receiving eNB 1  can deduce the right offset value to use is to utilize the fact that for the given system bandwidth (or given total number of PRBs (physical resource blocks) available at sending eNB 2  (which is known or conveyed separately to eNB 1 )) the number of sub bands for which CQIs are reported is distinct under those two aperiodic modes, respectively. Another alternative is to convey the exact configured feedback mode (such as aperiodic 3-1 etc) under the Report type IE (information element).   Allows sending “raw” CQI over X2, in a format similar to what is received from the UE (i.e. Subband Index)   Allows sending both Periodic and Aperiodic reports in the same X2 message; in case of overlapping Aperiodic and Periodic CSI reports, the handling is left to receiving eNB implementation (e.g. merge, discard, etc). We note that sending two reports in the same message is beneficial since otherwise several reports may need to be dropped by the sending eNB in order to comply with the one report per X2 message constraint and the periodicity configured for the X2 messages.       
 
         [0250]    However, a problem in sending both aperiodic and periodic subband reports together in the same X2 message as per the aforementioned structure, is that the associated reference wideband reports that are used to compute them can be different. In particular, the wideband rank indicators (RIs) that are determined by the UE under the configured aperiodic mode and the configured periodic mode can be different. Similarly, the wideband CQIs determined by the UE under the configured periodic mode and the configured aperiodic mode can be different. Furthermore, each subband CQI determined under the aperiodic mode is reported by the UE (over PUSCH (physical uplink shared channel)) as a differential value with respect to the corresponding wideband CQI. For example, suppose aperiodic feedback mode 2-2 and periodic feedback mode 2-1 are configured. Then, under the aperiodic mode 2-2 the UE will report one wideband CQI (per codeword) as well as one subband CQI (per codeword) for the selected best-M feedback as a differential value (using 2 bits) with respect to the wideband CQI corresponding to that codeword. On the other hand, under the periodic 2-1 mode the UE will report (over PUCCH (physical uplink control channel)) one wideband CQI (per codeword), with the wideband CQI of the second codeword being reported as a differential value with respect to the wideband CQI of the first one. In addition the UE will report one subband CQI for the first codeword and the second CQI as a differential value with respect to the subband CQI of the first one. 
         [0251]    Therefore it becomes clear that we need to have separate sets of RIs and wideband CQIs in the X2 message whenever that message contains both aperiodic and periodic subband reports. If such separate sets of wideband components are not included then the receiving eNB will use the same wideband RI or CQI(s) for both aperiodic and periodic information. This defeats the purpose of conveying separate aperiodic and periodic subband reports in the same X2 message. 
         [0252]    We propose an optimized structure in the following as a remedy to this issue. 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE E2 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and  
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE served 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 by the cell in eNB 2 . 
               
               
                 &gt;CSI Report per 
                   
                 1 . . .  
                   
                   
               
               
                 CSI Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt; Report type per 
                   
                 0 . . . 1 
                   
                   
               
               
                 CSI process 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Report Type 
                 M 
                   
                 ENUMERATED 
                   
               
               
                   
                   
                   
                 (periodic, 
                   
               
               
                   
                   
                   
                 aperiodic, . . . ) 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER (1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband 
                 M 
                   
                 9.2.bb 
                   
               
               
                 CQI 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband 
                   
                 0 . . .  
                   
                   
               
               
                 CQI List 
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband 
                 M 
                   
                 9.2.cc 
                   
               
               
                 CQI 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband 
                   
                   
                 INTEGER (0 . . .  
                 Included in the case 
               
               
                 Index 
                   
                   
                 27, . . . ) 
                 of UE selected 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEReport 
                 Maximum number of UE measurement reports. Value is 128. 
               
               
                 maxCSIProcess 
                 Maximum number of CSI processes. The value is 4. 
               
               
                 maxSubband 
                 Maximum number of subbands. The value can be 14 or 15 
               
               
                   
                 or 16 or 17 or 18 or 28 
               
               
                   
               
             
          
         
       
     
         [0253]    The value of 15 for the maxSubband is computed as 14+1, where 14 is the number of subbands in an aperiodic mode 3-0 or 3-1 assuming 110 DL (downlink) RBs (resource blocks) and 1 other subband is for periodic mode 2-0 or 2-1 assuming subband report for one bandwidth portion is allowed in the X2 message. Similarly, values 16, 17, 18 are computed assuming subband report for 2, 3, 4 bandwidth portions, respectively, are allowed in the same X2 message. 
         [0254]    The same problem identified above can also arise when the sending eNB sends two different reports (corresponding to a configured periodic mode or corresponding to a configured aperiodic mode). The presented optimized structure addresses even such cases since it allows for two reporting types per CSI process of each UE. Each one of those two reporting types can be both periodic or both aperiodic. 
         [0255]    In this context, we note that the value of maxSubband equal to 28 arises when we allow for two aperiodic reports, for example 28=14+14, where 14 is the number of subbands in an aperiodic mode 3-0 or 3-1 assuming 110 DL RBs. 
         [0256]    Moreover, to provide further flexibility the range of the “Report type per CSI process” can be increased from two to a larger value such as 3 or 4 or 5. 
         [0257]    9.2.bb Wideband CQI 
         [0258]    This IE indicates the Wideband CQI as defined in TS 36.213. 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E3 
               
               
                   
               
               
                   
                   
                   
                 IE Type and  
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 Reference 
                 Description 
               
               
                   
               
             
             
               
                 Wideband absolute CQI 
                 M 
                   
                 INTEGER  
                 Encoded in 
               
               
                 Codeword 0 
                   
                   
                 (0 . . . 15, . . . ) 
                 TS 36.213 
               
               
                   
                   
                   
                   
                 [11]. 
               
               
                 CHOICE Wideband CQI 
                 O 
                   
                   
                   
               
               
                 Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;Wideband absolute CQI 
                 M 
                   
                 INTEGER  
                 Encoded in 
               
               
                 Codeword 1 
                   
                   
                 (0 . . . 15, . . . ) 
                 TS 36.213 
               
               
                   
                   
                   
                   
                 [11]. 
               
               
                 &gt;Wideband differential  
                 M 
                   
                 INTEGER  
                 Encoded in 
               
               
                 CQI Codeword 1 
                   
                   
                 (0 . . . 7, . . . ) 
                 TS 36.213 
               
               
                   
                   
                   
                   
                 [11]. 
               
               
                   
               
             
          
         
       
     
         [0259]    9.2.cc Subband CQI 
         [0260]    This IE indicates the Subband CQI as defined in TS 36.213. 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E4 
               
               
                   
               
               
                   
                   
                   
                 IE Type and 
                   
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 Reference 
                 Semantics Description 
               
               
                   
               
             
             
               
                 CHOICE Subband  
                 M 
                   
                   
                   
               
               
                 CQI Codeword 0 
                   
                   
                   
                   
               
               
                 &gt;Subband 
                 M 
                   
                 INTEGER (0 . . .  
                 Encoded in TS 36.213 [11]. 
               
               
                 absolute CQI 
                   
                   
                 15, . . . ) 
                   
               
               
                 Codeword 0 
                   
                   
                   
                   
               
               
                 &gt;Subband 
                 M 
                   
                 INTEGER (0 . . . 3, . . . ) 
                 Encoded in TS 36.213 [11]. 
               
               
                 differential CQI 
                   
                   
                   
                   
               
               
                 Codeword 0 
                   
                   
                   
                   
               
               
                 CHOICE Subband 
                 O 
                   
                   
                   
               
               
                 CQI Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;Subband 
                 M 
                   
                 INTEGER (0 . . .  
                 Encoded in TS 36.213 [11]. 
               
               
                 absolute CQI 
                   
                   
                 15, . . . ) 
                   
               
               
                 Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;Subband 
                 M 
                   
                 INTEGER (0 . . . 7, . . . ) 
                 Encoded in TS 36.213 [11]. 
               
               
                 differential CQI 
                   
                   
                   
                   
               
               
                 Codeword 1 
                   
                   
                   
                   
               
               
                 &gt;Subband 
                 M 
                   
                 INTEGER (0 . . . 3, . . . ) 
                 Encoded in TS 36.213 [11]. 
               
               
                 differential CQI 
                   
                   
                   
                   
               
               
                 Codeword 1 
               
               
                   
               
             
          
         
       
     
         [0261]    Other equivalent variations of the optimized structure are possible with the common theme being that a separate wideband component (comprising RI and wideband CQI(s)) is conveyed for the aperiodic and the periodic reports, respectively, and where the structure should allow the receiving eNB to unambiguously associate the periodic and aperiodic subband components with their respective wideband counterparts. Notice that under the optimized structure if only one of the aperiodic or periodic subband information is reported in the X2 message, it will include only the corresponding wideband information. 
         [0262]    Notice also that under the aperiodic feedback modes (2-0 and 2-1) the UE reports common subband information for all the best-M subbands, thus in the structure presented above the sender eNB will repeat the same subband CQI for all the best-M indicated subbands. This repetition can be avoided by modifying the structure as follows. 
         [0263]    The subband CQI IE is made optional with the understanding that if this IE is not present the CQI for that subband is taken to be the same as that of the subband (closest to it in frequency and of the same reporting type) with a lower index for which the CQI has been conveyed in that message, with the restriction that the latter CQI must have been indicated. 
         [0264]    Option B: Subband Start+Subband Size 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E5 
               
               
                   
               
             
             
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Subband CQI 
                 M 
                   
                 9.2.cc 
                   
               
               
                 &gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER 
                 Corresponds to the PRB 
               
               
                   
                   
                   
                 (2 . . . 109, . . . ) 
                 number of the first PRB in 
               
               
                   
                   
                   
                   
                 a subband defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11] for the system 
               
               
                   
                   
                   
                   
                 bandwidth.lf this IE is not 
               
               
                   
                   
                   
                   
                 present, the subband is 
               
               
                   
                   
                   
                   
                 contiguous with the 
               
               
                   
                   
                   
                   
                 previous subband in the 
               
               
                   
                   
                   
                   
                 list, or starts with PRB 0 if 
               
               
                   
                   
                   
                   
                 this is the first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 M 
                   
                 ENUMERATED 
                 Corresponds to a value of 
               
               
                   
                   
                   
                 (2, 3, 4, 6, 8, . . . ) 
                 subband size k defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11] for the 
               
               
                   
                   
                   
                   
                 system bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored for the highest 
               
               
                   
                   
                   
                   
                 frequency subband. 
               
               
                   
               
             
          
         
       
     
         [0265]    Notes for Option B:
       Primary Motivation: Enables greater implementation flexibility for sending “processed” CQI in alignment with the RAN3 agreement that “the serving eNB can process CSI (implementation)”, particularly for the case where UE is configured for both Aperiodic and Periodic CSI reporting   Description: The Subband Start and Subband Size IEs are used to explicitly indicate the subbands. The subbands are restricted to those defined for the system bandwidth N RB   DL .   Allows sending “raw” CQI over X2, but in a different format than used by the UE (i.e. Subband Start)   Allows sending both Periodic and Aperiodic reports in the same X2 message; in case of overlapping Aperiodic and Periodic CSI reports, the sending eNB can process (e.g. merge) according to implementation-specific algorithms       
 
         [0270]    We note that in this structure given for option-B since only one set of wideband components are included, the sending eNB must harmonize RIs and wideband CQIs that are received from a periodic and aperiodic reports or two different periodic reports or two different aperiodic reports, respectively. In this context, using absolute value for the subband CQIs is particularly beneficial since then such CQIs can be directly used without matching them to any sideband reference. 
         [0271]    As another optimization in this structure the Subband CQI IE can be made optional in which case the CQI for this subband is assumed to be the same as that of the last preceding subband for which a CQI is indicated. The CQI for the first sub band is always indicated. This optimization helps to avoid redundancies that can arise for instance in conveying best-M feedback as described before. 
         [0272]    We note that here maximum number of subbands can be 28 (assuming 110 DL RBs and subband size of 4 under aperiodic mode 2-0 or 2-2). 
         [0273]    Option C: Subband Index+Subband Size 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E6 
               
               
                   
               
             
             
               
                 &gt;&gt;Subband  
                   
                 0 . . .  
                   
                   
               
               
                 CQI List 
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 M 
                   
                 9.2.cc 
                   
               
               
                 CQI 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 O 
                   
                 INTEGER 
                 Included in case of  
               
               
                 Index 
                   
                   
                 (0 . . . 27, . . . ) 
                 UE selected subband  
               
               
                   
                   
                   
                   
                 CQI reporting. 
               
               
                 &gt;&gt;&gt;Subband  
                 M 
                   
                 ENUMER - 
                 Corresponds to a  
               
               
                 Size 
                   
                   
                 ATED 
                 value of subband  
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 size k defined in TS  
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11] for the  
               
               
                   
                   
                   
                   
                 system bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored if the  
               
               
                   
                   
                   
                   
                 Subband Index  
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 the highest  
               
               
                   
                   
                   
                   
                 frequency subband. 
               
               
                   
               
             
          
         
       
     
         [0274]    Notes for Option C:
       Description: The Subband Size IE is used by sending eNB to explicitly indicate the subband partitioning (rather than receiving eNB deriving the subband partitioning based on information about the UE&#39;s CSI reporting configuration). The PRB number of the first PRB in the subband is calculated as (Subband Index×Subband Size).       
 
         [0276]    Allows sending “raw” CQI over X2, in a format similar to what is received from the UE (i.e. Subband Index) 
         [0277]    Allows sending both Periodic and Aperiodic reports in the same X2 message; in case of overlapping Aperiodic and Periodic CSI reports, the sending eNB can process (e.g. merge) according to implementation-specific algorithms 
         [0278]    If overlapping Aperiodic and Periodic CSI reports are received, then sending eNB can (as implementation option) “split” the Periodic subband into two Aperiodic subbands over X2. Assumption is that, according to subband definitions in TS 36.213, a Periodic subband is always composed of two Aperiodic subbands. 
       Example 
       [0279]    N RB   DL  is 50, and eNB receives two CSI reports over Uu during a given interval: Aperiodic Mode 2-* for subband index 1 (subband size 3) and Periodic Mode 2-* for subband index 0 (subband size 6). Then, eNB has several options for sending the information over X2: 
         [0280]    a) Send both reports over X2 and let receiving eNB decide how to handle 
         [0281]    b) Select one of the two reports to send over X2 (e.g. the latest report) 
         [0282]    c) Merge the Aperiodic and Periodic reports into two Aperiodic reports over X2 (subband index 0 and 1) 
         [0283]    The observation made in option-A regarding the need to send separate wideband components in case both aperiodic and periodic reports are sent on the same X2 message also holds in this case. 
         [0284]    Thus, we need to modify option-C as the following: 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E7 
               
               
                   
               
               
                   
                   
                   
                 IE type and  
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE served 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 by the cell in eNB 2 . 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt; Refence type per  
                   
                 0 . . . 1 
                   
                   
               
               
                 CSI process 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Reference Type 
                 M 
                   
                 ENUMERATED 
                   
               
               
                   
                   
                   
                 (periodic, 
                   
               
               
                   
                   
                   
                 aperiodic, . . . ) 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER (1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Subband CQI 
                 M 
                   
                 9.2.cc 
                   
               
               
                 &gt;&gt;&gt;Subband Index 
                 O 
                   
                 INTEGER 
                 Included in case of 
               
               
                   
                   
                   
                 (0 . . . 27, . . . ) 
                 UE selected 
               
               
                   
                   
                   
                   
                 subband CQI 
               
               
                   
                   
                   
                   
                 reporting. 
               
               
                 &gt;&gt;&gt;Subband Size 
                 M 
                   
                 ENUMERATED  
                 Corresponds to a 
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 value of subband 
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11] for the 
               
               
                   
                   
                   
                   
                 system bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored if the 
               
               
                   
                   
                   
                   
                 Subband Index 
               
               
                   
                   
                   
                   
                 corresponds to the 
               
               
                   
                   
                   
                   
                 highest frequency 
               
               
                   
                   
                   
                   
                 subband. 
               
               
                   
               
             
          
         
       
     
         [0285]    Other equivalent variations of the optimized structure are possible with the common theme being that a separate wideband component (comprising RI and wideband CQI(s)) is conveyed as a reference for the aperiodic and the periodic subband reports, respectively, and where the structure should allow the receiving eNB to unambiguously associate the periodic and aperiodic subband components with their respective wideband counterparts. Notice that under the optimized structure if only one of the aperiodic or periodic subband information is reported in the X2 message, it will include only the corresponding wideband information. Further, in case the structure includes merged CSI (where the merging or processing is done by the sender) then only one wideband component will be included and in this case all the subband CQIs will be conveyed as absolute CQIs (using 4 bits or 16 possibilities). 
         [0286]    In this option the sending eNB must ensure that it uses the right number of subbands in its message when conveying the aperiodic CSI information. As described for option-A, doing so is important since it will enable receiving eNB to determine what the differential CQI conveyed for that subband means. This is because in aperiodic mode 3-0 (or 3-1) and aperiodic mode 2-0 (or 2-2) the same differential value can be mapped to different offsets, respectively. Thus, the only way the receiving eNB 1  can deduce the right offset value to use is to utilize the fact that for the given system bandwidth (or given total number of PRBs available at sending eNB 2  (which is known or conveyed separately to eNB 1 )) the number of sub bands for which CQIs are reported is distinct under those two aperiodic modes, respectively. 
         [0287]    Option C′: Subband Index+Subband Size 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE E8 
               
               
                   
               
             
             
               
                 &gt;&gt;Subband  
                 M 
                   
                 ENUMERATED 
                 Corresponds to a 
               
               
                 Size 
                   
                   
                 (2, 3, 4, 6,  
                 value of subband  
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11] for the 
               
               
                   
                   
                   
                   
                 system bandwidth. 
               
               
                 &gt;&gt;Subband  
                   
                 0 . . .  
                   
                   
               
               
                 CQI List 
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 M 
                   
                 9.2.cc 
                   
               
               
                 CQI 
                   
                   
                   
                   
               
               
                 &gt;&gt;&gt;Subband  
                 O 
                   
                 INTEGER 
                 Included in case of 
               
               
                 Index 
                   
                   
                 (0 . . . 27, . . . ) 
                 UE selected subband 
               
               
                   
                   
                   
                   
                 CQI reporting. 
               
               
                   
               
             
          
         
       
     
         [0288]    Notes for Option C′:
       Description: Like Option C, but the Subband Size is fixed for all subbands. Here maximum number of subbands can be 28 (assuming 110 DL RBs and subband size of 4 under aperiodic mode 2-0 or 2-2).       
 
         [0290]    eRNTP Enhancements. 
         [0291]    We provide an eRNTP version which allows the sender eNB to seamlessly convey either explicitly convey the applied power level (relative to one or more specified thresholds) or to convey whether a resource will be interference protected or not. We note that a resource can be interference protected by multiple methods which include lower power or by using an appropriate beam forming vector etc. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
           
               
                 TABLE E9 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                 RNTP per PRB 
                 M 
                   
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                   
                   
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                   
                   
                   
                 (6 . . . 110, . . .) 
                 represents a n PRB   
                   
                   
               
               
                   
                   
                   
                   
                 value (i.e. first 
                   
                   
               
               
                   
                   
                   
                   
                 bit = PRB 0 and so 
                   
                   
               
               
                   
                   
                   
                   
                 on), for which the 
                   
                   
               
               
                   
                   
                   
                   
                 bit value 
                   
                   
               
               
                   
                   
                   
                   
                 represents RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 (n PRB ), defined in 
                   
                   
               
               
                   
                   
                   
                   
                 TS 36.213 [11]. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 0 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 “Tx not 
                   
                   
               
               
                   
                   
                   
                   
                 exceeding RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 threshold”. 
                   
                   
               
               
                   
                   
                   
                   
                 Value 1 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 “no promise on 
                   
                   
               
               
                   
                   
                   
                   
                 the Tx power is 
                   
                   
               
               
                   
                   
                   
                   
                 given”. 
                   
                   
               
               
                   
                   
                   
                   
                 This IE is ignored 
                   
                   
               
               
                   
                   
                   
                   
                 if the Enhanced 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP IE is 
                   
                   
               
               
                   
                   
                   
                   
                 present. 
                   
                   
               
               
                 RNTP Threshold 
                 O 
                   
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                   
                   
                   
                 (−∞, −11, 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 −10, −9, −8, 
                 36.213 [11]. This 
                   
                   
               
               
                   
                   
                   
                 −7, −6, −5, −4, 
                 IE is always 
                   
                   
               
               
                   
                   
                   
                 −3, −2, −1, 0, 
                 present if the 
                   
                   
               
               
                   
                   
                   
                 1, 2, 3, . . .) 
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is not present. 
                   
                   
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                   
                 (1, 2, 4, . . .) 
                 antenna ports for 
                   
                   
               
               
                 Antenna Ports 
                   
                   
                   
                 cell-specific 
                   
                   
               
               
                   
                   
                   
                   
                 reference 
                   
                   
               
               
                   
                   
                   
                   
                 signals) defined 
                   
                   
               
               
                   
                   
                   
                   
                 in TS 36.211 [10] 
                   
                   
               
               
                 P_B 
                 M 
                   
                 INTEGER 
                 P B  is defined in 
                 — 
                 — 
               
               
                   
                   
                   
                 (0 . . . 3, . . .) 
                 TS 36.213 [11]. 
                   
                   
               
               
                 PDCCH 
                 M 
                   
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                   
                 (0 . . . 4, . . .) 
                 Predicted 
                   
                   
               
               
                 Impact 
                   
                   
                   
                 Number Of 
                   
                   
               
               
                   
                   
                   
                   
                 Occupied 
                   
                   
               
               
                   
                   
                   
                   
                 PDCCH OFDM 
                   
                   
               
               
                   
                   
                   
                   
                 Symbols (see TS 
                   
                   
               
               
                   
                   
                   
                   
                 36.211 [10]). 
                   
                   
               
               
                   
                   
                   
                   
                 Value 0 means 
                   
                   
               
               
                   
                   
                   
                   
                 “no prediction is 
                   
                   
               
               
                   
                   
                   
                   
                 available”. 
                   
                   
               
               
                 Enhanced RNTP 
                 O 
                   
                 BIT 
                 Each position in 
                   
                   
               
               
                 IE 
                   
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                   
                   
                   
                 (6 . . . 4400, . . .) 
                 represents a 
                   
                   
               
               
                   
                   
                   
                   
                 PRB in a 
                   
                   
               
               
                   
                   
                   
                   
                 subframe. If the 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP Threshold 
                   
                   
               
               
                   
                   
                   
                   
                 IE is present then 
                   
                   
               
               
                   
                   
                   
                   
                 the value “1” 
                   
                   
               
               
                   
                   
                   
                   
                 indicates ‘no 
                   
                   
               
               
                   
                   
                   
                   
                 promise on the 
                   
                   
               
               
                   
                   
                   
                   
                 Tx power is 
                   
                   
               
               
                   
                   
                   
                   
                 given’ and value 
                   
                   
               
               
                   
                   
                   
                   
                 “0” indicates ‘Tx 
                   
                   
               
               
                   
                   
                   
                   
                 not exceeding 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP threshold.’ 
                   
                   
               
               
                   
                   
                   
                   
                 If the 
                   
                   
               
               
                   
                   
                   
                   
                 RNTP Threshold 
                   
                   
               
               
                   
                   
                   
                   
                 IE is not present 
                   
                   
               
               
                   
                   
                   
                   
                 then value “1” 
                   
                   
               
               
                   
                   
                   
                   
                 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 ‘resource with no 
                   
                   
               
               
                   
                   
                   
                   
                 utilization 
                   
                   
               
               
                   
                   
                   
                   
                 constraints’ and 
                   
                   
               
               
                   
                   
                   
                   
                 value “0” 
                   
                   
               
               
                   
                   
                   
                   
                 indicates 
                   
                   
               
               
                   
                   
                   
                   
                 ‘interference 
                   
                   
               
               
                   
                   
                   
                   
                 protected 
                   
                   
               
               
                   
                   
                   
                   
                 resource.’ 
                   
                   
               
               
                   
                   
                   
                   
                 The first bit 
                   
                   
               
               
                   
                   
                   
                   
                 corresponds to 
                   
                   
               
               
                   
                   
                   
                   
                 PRB 0 of the first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe for 
                   
                   
               
               
                   
                   
                   
                   
                 which the 
                   
                   
               
               
                   
                   
                   
                   
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is valid, the 
                   
                   
               
               
                   
                   
                   
                   
                 second bit 
                   
                   
               
               
                   
                   
                   
                   
                 corresponds to 
                   
                   
               
               
                   
                   
                   
                   
                 PRB 1 of the first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe for 
                   
                   
               
               
                   
                   
                   
                   
                 which the 
                   
                   
               
               
                   
                   
                   
                   
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is valid, and so 
                   
                   
               
               
                   
                   
                   
                   
                 on. 
                   
                   
               
               
                   
                   
                   
                   
                 The length of the 
                   
                   
               
               
                   
                   
                   
                   
                 bit string is an 
                   
                   
               
               
                   
                   
                   
                   
                 integer 
                   
                   
               
               
                   
                   
                   
                   
                 (maximum 40) 
                   
                   
               
               
                   
                   
                   
                   
                 multiple of N RB   DL . 
                   
                   
               
               
                   
                   
                   
                   
                 N RB   DL  is defined in 
                   
                   
               
               
                   
                   
                   
                   
                 TS 36.211 [10]. 
                   
                   
               
               
                   
                   
                   
                   
                 The bit string 
                   
                   
               
               
                   
                   
                   
                   
                 may span across 
                   
                   
               
               
                   
                   
                   
                   
                 multiple 
                   
                   
               
               
                   
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                   
                 subframes. 
                   
                   
               
               
                   
                   
                   
                   
                 The pattern 
                   
                   
               
               
                   
                   
                   
                   
                 across 
                   
                   
               
               
                   
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                   
                 subframes 
                   
                   
               
               
                   
                   
                   
                   
                 formed by 
                   
                   
               
               
                   
                   
                   
                   
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is continuously 
                   
                   
               
               
                   
                   
                   
                   
                 repeated. 
                   
                   
               
               
                 Enhanced 
                   
                 0 . . . 1 
                   
                   
                   
                   
               
               
                 RNTP IE start 
                   
                   
                   
                   
                   
                   
               
               
                 time 
                   
                   
                   
                   
                   
                   
               
               
                 &gt;Starting SFN 
                 M 
                   
                 INTEGER 
                 SFN of the radio 
                   
                   
               
               
                   
                   
                   
                 (0 . . . 1023, . . .) 
                 frame containing 
                   
                   
               
               
                   
                   
                   
                   
                 the first subframe 
                   
                   
               
               
                   
                   
                   
                   
                 when the 
                   
                   
               
               
                   
                   
                   
                   
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is valid. 
                   
                   
               
               
                 &gt;Starting 
                 M 
                   
                 INTEGER 
                 Subframe number, 
                   
                   
               
               
                 Subframe Index 
                   
                   
                 (0 . . . 9, . . .) 
                 within the radio 
                   
                   
               
               
                   
                   
                   
                   
                 frame indicated by 
                   
                   
               
               
                   
                   
                   
                   
                 the Start SFN IE, 
                   
                   
               
               
                   
                   
                   
                   
                 of the first 
                   
                   
               
               
                   
                   
                   
                   
                 subframe when the 
                   
                   
               
               
                   
                   
                   
                   
                 Enhanced RNTP 
                   
                   
               
               
                   
                   
                   
                   
                 IE is valid. 
               
               
                   
               
             
          
         
       
     
       Embodiment F 
     F1. Introduction 
       [0292]    In this document we discuss some issues with subband indexing schemes and then present our preference in a proposal. 
       F2. Discussion 
       [0293]    F2.1 Conveying Both Periodic and Aperiodic Reports 
         [0294]    A desirable feature that should be supported by a CSI signaling scheme is the exchange of both periodic and aperiodic CSI reports in the same X2 message, possibly in a combined (or merged) form. In the absence of this feature, i.e., when the sending eNB is forced to choose either the periodic or the aperiodic CSI report obtained under a CSI process of some user, the sending eNB will have to drop available CSI reports. This would be unfortunate given that precious over-the-air signaling resources have already been spent in acquiring these reports and these reports can together convey more CSI that either individual one. 
         [0295]    Then, a problem that needs to be overcome in order to send both aperiodic and periodic subband reports together in the same X2 message, is described next. In particular, the associated reference wideband reports that are used to compute the constituent subband parts of the aperiodic and periodic CSI reports, respectively, can be different. Indeed, the wideband rank indicators (RIs) that are determined by the UE under the configured aperiodic mode and the configured periodic mode can be different. Similarly, the wideband CQIs determined by the UE under the configured periodic mode and the configured aperiodic mode are also more likely to be different. Furthermore, each subband CQI determined by the UE under the configured mode can be reported by it as a differential value with respect to a corresponding reference CQI. For example, suppose aperiodic feedback mode 2-2 and periodic feedback mode 2-1 are configured. Then, under the aperiodic mode 2-2 the UE will report (over PUSCH) one wideband CQI (per codeword) as well as one subband CQI (per codeword) for the selected best-M feedback as a differential value (using 2 bits) with respect to the wideband CQI corresponding to that codeword. On the other hand, under the periodic 2-1 mode the UE will report (over PUCCH) one wideband CQI (per codeword), with the wideband CQI of the second codeword being reported as a differential value with respect to the wideband CQI of the first one. In addition the UE will report one subband CQI for the first codeword and the second codeword subband CQI as a differential value with respect to the subband CQI of the first one. 
         [0296]    Therefore it becomes clear that we have to alternatives to overcome this issue: 
         [0297]    Alternative-1: Provision to include 
         [0298]    two separate sets of RIs and wideband CQIs in the X2 message whenever that message contains both aperiodic and periodic subband reports. This will allow simple forwarding of both aperiodic and periodic reports in the same X2 message. In this context, we note that a structure which does not provide for including two separate sets of wideband components, forces the sending eNB to merge the wideband components and use a common reference for both aperiodic and periodic subband information. This defeats the purpose of conveying separate aperiodic and periodic subband reports in the same X2 message. Another issue in including the report type IE (specifying periodic or aperiodic report) within the list of subbands, is that ambiguity can be introduced when certain aperiodic and periodic reports are combined. 
         [0299]    Alternative-2: Always merge separate sets of wideband components into one wideband component that will also be used as a common reference. In this case it is logical to merge the respective subband information as well, and upon doing so there is no need to indicate the type of the subband CSI report. However, this view prevents simple forwarding of both aperiodic and periodic reports in the same X2 message. 
         [0300]    In order to obtain the merits of both the aforementioned alternatives, we propose a simple structure. This structure is presented in three versions, with the second and third ones being more bit-efficient version of the first. 
         [0301]    The benefits of this proposal are as follows: 
         [0302]    It allows for simple forwarding of both aperiodic and periodic reports in the same X2 message. In fact it allows for forwarding of multiple aggregated aperiodic or periodic CSI reports (from a UE under a CSI process) or their combinations in the same X2 message. 
         [0303]    The parameter N RB   DL  together with the conveyed subband size IE defines the subband partition, which corresponds to one of those defined in TS36.213. 
         [0304]    It also allows for merging an aperiodic and a periodic report (or merging combinations of multiple periodic and/or multiple aperiodic CSI reports) without introducing any new subband definitions. This is because for a given total number of RBs (or PRBs), N RB   DL , the subband size in aperiodic mode 2-* is exactly half of that of the aperiodic mode 3-* as well as periodic mode 2-*. Thus, in order to combine such reports we can use the subbands defined by the smaller subband size and convey (possibly processed) CQIs for them. 
         [0305]    Other implementation based processing of the short-term CSI is also supported. 
         [0306]    The first version is relatively straightforward. Two of its features are however worth pointing out: 
         [0307]    For each CSI process we can convey up-to maxReferenceType reports. The Reference Type IE can be ENUMERATED for instance as periodic or aperiodic. Alternatively, the Reference Type IE can simply be dropped. 
         [0308]    The subband CQIs are conveyed sequentially in the increasing order of subband indices. Then, in case the subband CQI IE for a subband is not conveyed, the receiving eNB must use the CQI conveyed for the last preceding subband. The CQI for the first subband must always be included. This feature can significantly save overhead by avoiding redundancy. Note that when a UE is configured in the aperiodic mode 2-*, it selects and reports indices for M out of N subbands. However, only one CQI (per codeword) is reported by it for all the M selected subbands. Therefore, it is beneficial that redundancy is avoided in reporting such CQIs. 
         [0309]    The Subband Index IE is optional. In case this IE is not included then the subband CQI information for each one of the total number of subbands is conveyed. Recall that the parameter N RB   DL  together with the conveyed subband size IE defines the subband partition, thereby conveying the total number of subbands N. 
         [0310]    We now consider a more bit efficient second version in which the sub band selection is conveyed by means of a combinatorial index. 
         [0311]    Here, under each Reference Type IE, the parameter N RB   DL  together with the conveyed subband size IE defines the subband partition, thereby conveying the total number of subbands N. Also the number of subbands for which subband CQI is conveyed, M, is determined by the size of the Subband CQI List IE. 
         [0312]    The combinatorial index, r, is defined based on TS36.213 (section 7.2.1) as follows: 
         [0313]    The positions of the M selected subbands is conveyed using a combinatorial index r defined as 
         [0000]    
       
         
           
             r 
             = 
             
               
                 ∑ 
                 
                   i 
                   = 
                   0 
                 
                 
                   M 
                   - 
                   1 
                 
               
                
               
                 〈 
                 
                   
                     
                       
                         N 
                         - 
                         
                           s 
                           i 
                         
                       
                     
                   
                   
                     
                       
                         M 
                         - 
                         i 
                       
                     
                   
                 
                 〉 
               
             
           
         
       
     
         [0000]    where N denotes the total number of subbands and the set {s i } i=0   M-1 , (1≦s i ≦N, s i &lt;s i+1 ) contains the M sorted subband indices and 
         [0000]    
       
         
           
             
               〈 
               
                 
                   
                     x 
                   
                 
                 
                   
                     y 
                   
                 
               
               〉 
             
             = 
             
               { 
               
                 
                   
                     
                       ( 
                       
                         
                           
                             x 
                           
                         
                         
                           
                             y 
                           
                         
                       
                       ) 
                     
                   
                   
                     
                       x 
                       ≥ 
                       y 
                     
                   
                 
                 
                   
                     0 
                   
                   
                     
                       x 
                       &lt; 
                       y 
                     
                   
                 
               
             
           
         
       
     
         [0000]    is the extended binomial coefficient, resulting in unique label 
         [0000]    
       
         
           
             r 
             ∈ 
             
               
                 { 
                 
                   0 
                   , 
                   … 
                    
                   
                       
                   
                   , 
                   
                     
                       ( 
                       
                         
                           
                             N 
                           
                         
                         
                           
                             M 
                           
                         
                       
                       ) 
                     
                     - 
                     1 
                   
                 
                 } 
               
               . 
             
           
         
       
     
         [0314]    To illustrate, consider first the case when N RB   DL =110 and the Reference Type IE is set to be aperiodic. Then, we have two possibilities for subband selection. The first one is when the configured mode is 2-* in which case the subband size is 4 so that N=28 and here M=6. On the other hand, for aperiodic mode 3-* the subband size is 8 so that N=14 and here M=14. Similar argument applies to all other modes as well. It is also apparent that there is significant flexibility in aggregating several different reports under a Reference Type, as long as the subband partition is a valid one, i.e., corresponds to a one defined in TS36.213. Since the maximum value of N=28 (when N RB   DL =110 and subband size is 4) we represent the combinatorial index using a bit string of length  26 . This allows us to convey any possible selection choice of subbands from the maximum of 28 subbands. 
         [0315]    Next, we consider the third version in which the sub band selection is again conveyed by means of a combinatorial index. This version can be somewhat more restrictive compared to the second version but can also be more bit efficient. Here, the number of selected subbands and their size, in addition to their positions or indices, are also indicated by the combinatorial index. 
         [0316]    Consider first the case when the Report Type IE is set to be aperiodic. Then, we have two possibilities for subband selection. The first one is when the configured mode is 2-* in which case the combinatorial index, r, is defined based on TS36.213 (section 7.2.1) as follows: 
         [0317]    The positions of the M UE selected subbands is conveyed using a combinatorial index r defined as 
         [0000]    
       
         
           
             r 
             = 
             
               
                 ∑ 
                 
                   i 
                   = 
                   0 
                 
                 
                   M 
                   - 
                   1 
                 
               
                
               
                 〈 
                 
                   
                     
                       
                         N 
                         - 
                         
                           s 
                           i 
                         
                       
                     
                   
                   
                     
                       
                         M 
                         - 
                         i 
                       
                     
                   
                 
                 〉 
               
             
           
         
       
     
         [0000]    where N denotes the number of subbands and the set {s i } i=0   M-1 , (1≦s i ≦N, s i &lt;s i+1 ) contains the M sorted subband indices and 
         [0000]    
       
         
           
             
               〈 
               
                 
                   
                     x 
                   
                 
                 
                   
                     y 
                   
                 
               
               〉 
             
             = 
             
               { 
               
                 
                   
                     
                       ( 
                       
                         
                           
                             x 
                           
                         
                         
                           
                             y 
                           
                         
                       
                       ) 
                     
                   
                   
                     
                       x 
                       ≥ 
                       y 
                     
                   
                 
                 
                   
                     0 
                   
                   
                     
                       x 
                       &lt; 
                       y 
                     
                   
                 
               
             
           
         
       
     
         [0000]    is the extended binomial coefficient, resulting in unique label 
         [0000]    
       
         
           
             r 
             ∈ 
             
               
                 { 
                 
                   0 
                   , 
                   … 
                    
                   
                       
                   
                   , 
                   
                     
                       ( 
                       
                         
                           
                             N 
                           
                         
                         
                           
                             M 
                           
                         
                       
                       ) 
                     
                     - 
                     1 
                   
                 
                 } 
               
               . 
             
           
         
       
     
         [0318]    One additional possibility must be included to cover the case when the configured mode is 3-* in which case CQIs for all subbands have to be conveyed. We can choose r=−1 for this purpose. Then, notice that the combinatorial index, r, along with the parameter, N RB   DL , together convey the total number of subbands, N, and the number of selected subbands, M, as well as the size of each subband and their positions or indices. 
         [0319]    Consider next the case when the Report Type IE is set to be periodic. We consider the mode 2-* that is the only mode under which the subband information is reported. Here the user reports CSI for one selected subband from each one of the J bandwidth parts (or portions) sequentially over successive reporting instances. Therefore, depending on the periodicities configured for the X2 CSI exchange and the over-the-air reports, the sending eNB can have subband reports for up-to J subbands. Notice that since the user must report the information for each subband sequentially, no bandwidth part indicator is defined in TS36.213. We adopt the same approach and enforce that the subband CSI for all available bandwidth parts must be reported in the same X2 message. This nested structure will make the X2 message self-contained and avoid the need for a separate bandwidth part indicator. 
         [0320]    Accordingly, letting N 1 , N 2 , . . . , NJ, denote the number of subbands in each of the J bandwidth parts, the combinatorial index must cover for N 1  possibilities for the subband selection from the first bandwidth part, N 1 *N 2  possibilities for the subband selections together from the first and second bandwidth parts, and so on till N 1 *N 2 * . . . NJ possibilities for the subband selections together from all the J bandwidth parts. 
       F3. Conclusion 
       [0321]    We discussed the necessary X2 message to support CSI exchange for inter-eNB CoMP and presented our views on subband indexing along with corresponding proposals. 
         [0322]    9.1.2.14 RESOURCE STATUS UPDATE 
         [0323]    This message is sent by eNB 2  to neighbouring eNB 1  to report the results of the requested measurements. 
         [0324]    Direction: eNB 2 →eNB 1 . 
         [0325]    9.2.aa UE-CSI Report (Version-1) 
         [0326]    This IE provides UE-CSI information for a set of UEs served by eNB 2 . 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE F1 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI Report per UE 
                   
                 1 . . . 
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt; UE-CSI process 
                 M 
                 FFS 
                 FFS 
                 CSI process 
               
               
                 Configuration index 
                   
                   
                   
                 configuration 
               
               
                   
                   
                   
                   
                 information. 
               
               
                 &gt;&gt; Reference type per  
                   
                 1 . . .  
                   
                   
               
               
                 CSI process 
                   
                 &lt;maxReferenceTypes&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Reference Type 
                 M 
                   
                 ENUMERATED 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER (1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;&gt; Subband Size 
                 M 
                   
                 ENUMERATED  
                 Corresponds to a 
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 value of subband 
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11] for 
               
               
                   
                   
                   
                   
                 the system 
               
               
                   
                   
                   
                   
                 bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored if the 
               
               
                   
                   
                   
                   
                 Subband Index 
               
               
                   
                   
                   
                   
                 corresponds to the 
               
               
                   
                   
                   
                   
                 highest frequency 
               
               
                   
                   
                   
                   
                 subband. 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 9.2.cc 
                 If this IE is not 
               
               
                   
                   
                   
                   
                 present, the CQI is 
               
               
                   
                   
                   
                   
                 identical to the one 
               
               
                   
                   
                   
                   
                 provided for the 
               
               
                   
                   
                   
                   
                 last preceding 
               
               
                   
                   
                   
                   
                 subband. This IE is 
               
               
                   
                   
                   
                   
                 always present for 
               
               
                   
                   
                   
                   
                 the first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                 &gt;&gt;&gt;&gt;Subband Index 
                 O 
                   
                 INTEGER 
                   
               
               
                   
                   
                   
                 (0 . . . 27, . . . ) 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEReport 
                 Maximum number of UE measurement reports. Value is 128. 
               
               
                 maxCSIProcess 
                 Maximum number of CSI processes. The value is 4. 
               
               
                 maxReferenceTypes 
                 Maximum types of of CSI reports. The value is 2. 
               
               
                 maxSubband 
                 Maximum number of subbands. The value is 28 
               
               
                   
               
             
          
         
       
     
         [0327]    Alternatively, the value of maxReferenceTypes can be 3 or 4. 
         [0328]    UE-CSI Report (Version-2) 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE F2 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt; UE-CSI process 
                 M 
                 FFS 
                 FFS 
                 CSI process 
               
               
                 Configuration index 
                   
                   
                   
                 configuration 
               
               
                   
                   
                   
                   
                 information. 
               
               
                 &gt;&gt; Reference type  
                   
                 1 . . .  
                   
                   
               
               
                 per CSI process 
                   
                 &lt;maxReferenceTypes&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Reference Type 
                 M 
                   
                 ENUMERATED 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER (1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;&gt; Subband Size 
                 M 
                   
                 ENUMERATED  
                 Corresponds to a 
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 value of subband 
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11] 
               
               
                   
                   
                   
                   
                 for the system 
               
               
                   
                   
                   
                   
                 bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored if the 
               
               
                   
                   
                   
                   
                 Subband Index 
               
               
                   
                   
                   
                   
                 corresponds to 
               
               
                   
                   
                   
                   
                 the highest 
               
               
                   
                   
                   
                   
                 frequency 
               
               
                   
                   
                   
                   
                 subband. 
               
               
                 &gt;&gt;&gt; combinatorial  
                 M 
                   
                 BITSTRING 
                 As defined in 
               
               
                 index 
                   
                   
                 (SIZE(26)) 
                 TS36.213 
               
               
                   
                   
                   
                   
                 (section 7.2.1). 
               
               
                   
                   
                   
                   
                 The indices of the 
               
               
                   
                   
                   
                   
                 subbands in the 
               
               
                   
                   
                   
                   
                 list are indicated 
               
               
                   
                   
                   
                   
                 by this 
               
               
                   
                   
                   
                   
                 combinatorial 
               
               
                   
                   
                   
                   
                 index. Subband 
               
               
                   
                   
                   
                   
                 CQIs are sorted 
               
               
                   
                   
                   
                   
                 in the order of 
               
               
                   
                   
                   
                   
                 increasing 
               
               
                   
                   
                   
                   
                 frequency 
               
               
                   
                   
                   
                   
                 (increasing 
               
               
                   
                   
                   
                   
                 subband indices). 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 0 
                   
                 9.2.cc 
                 If this IE is not 
               
               
                   
                   
                   
                   
                 present, the CQI 
               
               
                   
                   
                   
                   
                 is identical to the 
               
               
                   
                   
                   
                   
                 one provided for 
               
               
                   
                   
                   
                   
                 the last preceding 
               
               
                   
                   
                   
                   
                 subband. This IE 
               
               
                   
                   
                   
                   
                 is always present 
               
               
                   
                   
                   
                   
                 for the first 
               
               
                   
                   
                   
                   
                 subband in the 
               
               
                   
                   
                   
                   
                 list. 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEReport 
                 Maximum number of UE measurement reports. Value is 128. 
               
               
                 maxCSIProcess 
                 Maximum number of CSI processes. The value is 4. 
               
               
                 maxReferenceTypes 
                 Maximum types of of CSI reports. The value is 2. 
               
               
                 maxSubband 
                 Maximum number of subbands. The value is 28 
               
               
                   
               
             
          
         
       
     
         [0329]    Version-3: 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE F3 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 served by the 
               
               
                   
                   
                   
                   
                 cell in eNB 2 . 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt;UE-CSI process 
                 M 
                 FFS 
                 FFS 
                 CSI process 
               
               
                 Configuration index 
                   
                   
                   
                 configuration 
               
               
                   
                   
                   
                   
                 information. 
               
               
                 &gt;&gt; Reference type per  
                   
                 1 . . .  
                   
                   
               
               
                 CSI process 
                   
                 &lt;maxReferenceTypes&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Reference Type 
                 M 
                   
                 ENUMER- 
                   
               
               
                   
                   
                   
                 ATED 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER  
                 Defined in TS 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;&gt; combinatorial index 
                 M 
                   
                   
                 As defined in 
               
               
                   
                   
                   
                   
                 TS36.213 
               
               
                   
                   
                   
                   
                 (section 7.2.1). 
               
               
                   
                   
                   
                   
                 The number of 
               
               
                   
                   
                   
                   
                 subbands in the 
               
               
                   
                   
                   
                   
                 list, their indices, 
               
               
                   
                   
                   
                   
                 as well their 
               
               
                   
                   
                   
                   
                 size, are 
               
               
                   
                   
                   
                   
                 indicated by this 
               
               
                   
                   
                   
                   
                 combinatorial 
               
               
                   
                   
                   
                   
                 index. Subband 
               
               
                   
                   
                   
                   
                 CQIs are sorted 
               
               
                   
                   
                   
                   
                 in the order of 
               
               
                   
                   
                   
                   
                 increasing 
               
               
                   
                   
                   
                   
                 frequency 
               
               
                   
                   
                   
                   
                 (increasing 
               
               
                   
                   
                   
                   
                 subband 
               
               
                   
                   
                   
                   
                 indices). 
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 9.2.cc 
                 If this IE is not 
               
               
                   
                   
                   
                   
                 present, the CQI 
               
               
                   
                   
                   
                   
                 is identical to the 
               
               
                   
                   
                   
                   
                 one provided for 
               
               
                   
                   
                   
                   
                 the last 
               
               
                   
                   
                   
                   
                 preceding 
               
               
                   
                   
                   
                   
                 subband. This IE 
               
               
                   
                   
                   
                   
                 is always 
               
               
                   
                   
                   
                   
                 present for the 
               
               
                   
                   
                   
                   
                 first subband in 
               
               
                   
                   
                   
                   
                 the list. 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEReport 
                 Maximum number of UE measurement reports. Value is 128. 
               
               
                 maxCSIProcess 
                 Maximum number of CSI processes. The value is 4. 
               
               
                 maxReferenceTypes 
                 Maximum types of of CSI reports. The value is 2. 
               
               
                 maxSubband 
                 Maximum number of subbands. The value is 28 
               
               
                   
               
             
          
         
       
     
       Embodiment G 
     G1. Introduction 
       [0330]    In order to meet the objectives of the Inter eNB CoMP WI it was agreed to extend the RNTP IE to include transmission power level indication per time frequency resources spanning across multiple subframes. 
         [0331]    In the following, we provide our views on content of this message, as well as proposals. 
       G2. Discussion 
       [0332]    G2.1 eRNTP Exchange 
         [0333]    One concern that was raised during the discussions in RAN3#87bis was on the semantic description of the enhanced RNTP IE whether it is suitable to use the phrase “TX power not exceeding a threshold”. This is because certain implementations can achieve “interference protection” via other means such as beam-forming or beam-steering. We believe that even for such implementations, there is a notion of a threshold on effective radiated power from which the receiving eNB can deduce if a resource would be interference protected or not. We note that effective radiated power is a commonly used metric (terminology) which captures the effect of several relevant parameters such as transmit power, antenna gain, directivity, etc. Consequently, it is suitable to have an explicit threshold associated with the enhanced RNTP which indicates the “action” by the sender. We note that it is possible for sender eNB to send different eRNTP messages to different receiving eNBs to convey the potentially different net impacts of its adopted beam patterns and transmit powers on those receiving eNBs. 
         [0334]    Accordingly, our preference is to retain the baseline agreement from the last meeting with a modification in the semantic description to use the phrase “Effective radiated TX power” instead of “TX power”. This will also accommodate newer implementations that rely on spatial/antenna domain processing to achieve interference mitigation. 
         [0335]    We present two proposals. The first one is a more bit-efficient version of the BL agreement (albeit including the aforementioned modified semantic description). It exploits that fact an RNTP IE indicating transmit power levels for the first subframe (subframe #0) must always conveyed. Then, instead of ignoring this IE in the case when the enhanced RNTP IE is included, we can still use it to convey the per-PRB power level information for the first subframe. Moreover, instead of providing per-PRB power level information for each subsequent subframe in the enhanced RNTP IE, we can optionally adopt a more efficient representation in which such information for a subframe is conveyed only if it differs from that of the preceding one. 
         [0336]    The second proposal is based on multiple thresholds, where we note that certain implementation can extract gains from such finer power level indication. The point here is that since the choice ‘11’ already indicates no promise on the effective radiated transmit power level (which covers the case of transmit power being arbitrarily high) we can use three thresholds (instead of two), since there is no need to convey that the power level is greater than HPTH (as this is subsumed by ‘11’). 
       G3. Conclusion 
       [0337]    We discussed the necessary X2 message to support eRNTP exchange for inter-eNB CoMP and presented corresponding proposals. 
         [0338]    Proposal: 
         [0339]    9.2.19 Relative Narrowband Tx Power (RNTP) 
         [0340]    This IE provides an indication on DL power restriction per PRB in a cell and other information needed by a neighbour eNB for interference aware scheduling. 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE G1 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                   
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 Semantics description 
               
               
                   
               
               
                 RNTP Per PRB 
                 M 
                   
                 BIT STRING 
                 Each position in the bitmap 
               
               
                   
                   
                   
                 (6 . . . 110, . . . ) 
                 represents a n PRB  value (i.e. 
               
               
                   
                   
                   
                   
                 first bit = PRB 0 and so on), 
               
               
                   
                   
                   
                   
                 for which the bit value 
               
               
                   
                   
                   
                   
                 represents RNTP (n PRB ), 
               
               
                   
                   
                   
                   
                 defined in TS 36.213 [11]. 
               
               
                   
                   
                   
                   
                 Value 0 indicates 
               
               
                   
                   
                   
                   
                 “Effective radiated Tx 
               
               
                   
                   
                   
                   
                 power not exceeding RNTP 
               
               
                   
                   
                   
                   
                 threshold”. 
               
               
                   
                   
                   
                   
                 Value 1 indicates “no 
               
               
                   
                   
                   
                   
                 promise on the Effective 
               
               
                   
                   
                   
                   
                 radiated Tx power is 
               
               
                   
                   
                   
                   
                 given”. This IE is used to 
               
               
                   
                   
                   
                   
                 indicate DL power 
               
               
                   
                   
                   
                   
                 restriction per PRB for the 
               
               
                   
                   
                   
                   
                 first subframe. 
               
               
                 RNTP Threshold 
                 M 
                   
                 ENUMERATED 
                 RNTP threshold  is defined in 
               
               
                   
                   
                   
                 (−∞, −11, −10, −9, −8, 
                 TS 36.213 [11]. 
               
               
                   
                   
                   
                 −7, −6, −5, −4, −3, −2, 
                   
               
               
                   
                   
                   
                 −1, 0, 1, 2, 3, . . . ) 
                   
               
               
                 Number Of 
                 M 
                   
                 ENUMERATED (1, 
                 P (number of antenna ports 
               
               
                 Cell-specific 
                   
                   
                 2, 4, . . . ) 
                 for cell-specific reference 
               
               
                 Antenna Ports 
                   
                   
                   
                 signals) defined in TS 
               
               
                   
                   
                   
                   
                 36.211 [10] 
               
               
                 P_B 
                 M 
                   
                 INTEGER (0 . . . 3, . . . ) 
                 P B  is defined in TS 36.213 
               
               
                   
                   
                   
                   
                 [11]. 
               
               
                 PDCCH 
                 M 
                   
                 INTEGER (0 . . . 4, . . . ) 
                 Measured by Predicted 
               
               
                 Interference 
                   
                   
                   
                 Number Of Occupied 
               
               
                 Impact 
                   
                   
                   
                 PDCCH OFDM Symbols 
               
               
                   
                   
                   
                   
                 (see TS 36.211 [10]). 
               
               
                   
                   
                   
                   
                 Value 0 means “no 
               
               
                   
                   
                   
                   
                 prediction is available”. 
               
               
                 Enhanced 
                 O 
                   
                 BIT STRING 
                 Each position in the bitmap 
               
               
                 RNTP 
                   
                   
                 (6 . . . 4290, . . . ) 
                 represents a PRB in a 
               
               
                   
                   
                   
                   
                 subframe, for which value 
               
               
                   
                   
                   
                   
                 “1” indicates ‘no promise 
               
               
                   
                   
                   
                   
                 on the Effective radiated Tx 
               
               
                   
                   
                   
                   
                 power is given’ and value 
               
               
                   
                   
                   
                   
                 “0” indicates Effective 
               
               
                   
                   
                   
                   
                 radiated Tx power not 
               
               
                   
                   
                   
                   
                 exceeding RNTP 
               
               
                   
                   
                   
                   
                 threshold.’ 
               
               
                   
                   
                   
                   
                 The first bit corresponds to 
               
               
                   
                   
                   
                   
                 PRB 0 of the first subframe 
               
               
                   
                   
                   
                   
                 for which the IE is valid, 
               
               
                   
                   
                   
                   
                 the second bit corresponds 
               
               
                   
                   
                   
                   
                 to PRB 1 of the first 
               
               
                   
                   
                   
                   
                 subframe for which the IE 
               
               
                   
                   
                   
                   
                 is valid, and so on. 
               
               
                   
                   
                   
                   
                 The length of the bit string 
               
               
                   
                   
                   
                   
                 is an integer (maximum 39) 
               
               
                   
                   
                   
                   
                 multiple of N RB   DL  which is 
               
               
                   
                   
                   
                   
                 defined in TS 36.211 [10]. 
               
               
                   
                   
                   
                   
                 The bit string may span 
               
               
                   
                   
                   
                   
                 across multiple contiguous 
               
               
                   
                   
                   
                   
                 subframes. 
               
               
                   
                   
                   
                   
                 The pattern across 
               
               
                   
                   
                   
                   
                 contiguous subframes 
               
               
                   
                   
                   
                   
                 (formed by RNTP IE and 
               
               
                   
                   
                   
                   
                 Enhanced RNTP IE) is 
               
               
                   
                   
                   
                   
                 continuously repeated 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE G2 
               
               
                   
               
               
                 IE/Group 
                   
                   
                 IE type and 
                 Semantics 
                   
                 Assigned 
               
               
                 Name 
                 Presence 
                 Range 
                 reference 
                 description 
                 Criticality 
                 Criticality 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 RNTP Per PRB 
                 M 
                 BIT 
                 Each position in 
                 — 
                 — 
               
               
                   
                   
                 STRING 
                 the bitmap 
                   
                   
               
               
                   
                   
                 (6 . . . 110, . . .) 
                 represents a n PRB   
                   
                   
               
               
                   
                   
                   
                 value (i.e. first 
                   
                   
               
               
                   
                   
                   
                 bit = PRB 0 and 
                   
                   
               
               
                   
                   
                   
                 so on), for which 
                   
                   
               
               
                   
                   
                   
                 the bit value 
                   
                   
               
               
                   
                   
                   
                 represents RNTP 
                   
                   
               
               
                   
                   
                   
                 (n PRB ), defined 
                   
                   
               
               
                   
                   
                   
                 in TS 36.213 
                   
                   
               
               
                   
                   
                   
                 [11]. 
                   
                   
               
               
                   
                   
                   
                 Value 0 
                   
                   
               
               
                   
                   
                   
                 indicates 
                   
                   
               
               
                   
                   
                   
                 “Effective 
                   
                   
               
               
                   
                   
                   
                 radiated Tx 
                   
                   
               
               
                   
                   
                   
                 power not 
                   
                   
               
               
                   
                   
                   
                 exceeding 
                   
                   
               
               
                   
                   
                   
                 RNTP 
                   
                   
               
               
                   
                   
                   
                 threshold”. 
                   
                   
               
               
                   
                   
                   
                 Value 1 
                   
                   
               
               
                   
                   
                   
                 indicates “no 
                   
                   
               
               
                   
                   
                   
                 promise on the 
                   
                   
               
               
                   
                   
                   
                 Effective 
                   
                   
               
               
                   
                   
                   
                 radiated Tx 
                   
                   
               
               
                   
                   
                   
                 power is 
                   
                   
               
               
                   
                   
                   
                 given”. This IE 
                   
                   
               
               
                   
                   
                   
                 is ignored when 
                   
                   
               
               
                   
                   
                   
                 the enhanced 
                   
                   
               
               
                   
                   
                   
                 RNTP IE is 
                   
                   
               
               
                   
                   
                   
                 included. 
                   
                   
               
               
                 RNTP 
                 M 
                 ENUMERATED 
                 RNTP threshold  is 
                 — 
                 — 
               
               
                 Threshold 
                   
                 (−∞, −11, 
                 defined in TS 
                   
                   
               
               
                   
                   
                 −10, −9, −8, 
                 36.213 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 [11]. This IE is 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 ignored when 
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 the enhanced 
                   
                   
               
               
                   
                   
                   
                 RNTP IE is 
                   
                   
               
               
                   
                   
                   
                 included. 
                   
                   
               
               
                 Number Of 
                 M 
                 ENUMERATED 
                 P (number of 
                 — 
                 — 
               
               
                 Cell-specific 
                   
                 (1, 2, 4, . . .) 
                 antenna ports for 
                   
                   
               
               
                 Antenna Ports 
                   
                   
                 cell-specific 
                   
                   
               
               
                   
                   
                   
                 reference 
                   
                   
               
               
                   
                   
                   
                 signals) defined 
                   
                   
               
               
                   
                   
                   
                 in TS 36.211 
                   
                   
               
               
                   
                   
                   
                 [10] 
                   
                   
               
               
                 PDCCH 
                 M 
                 INTEGER 
                 Measured by 
                 — 
                 — 
               
               
                 Interference 
                   
                 (0 . . . 4, . . .) 
                 Predicted 
                   
                   
               
               
                 Impact 
                   
                   
                 Number Of 
                   
                   
               
               
                   
                   
                   
                 Occupied 
                   
                   
               
               
                   
                   
                   
                 PDCCH OFDM 
                   
                   
               
               
                   
                   
                   
                 Symbols (see TS 
                   
                   
               
               
                   
                   
                   
                 36.211 [10]). 
                   
                   
               
               
                   
                   
                   
                 Value 0 means 
                   
                   
               
               
                   
                   
                   
                 “no prediction is 
                   
                   
               
               
                   
                   
                   
                 available”. 
                   
                   
               
               
                 Enhanced 
                 O 
                 BIT 
                 Each position 
                 — 
                 — 
               
               
                 RNTP 
                   
                 STRING 
                 in the bitmap 
                   
                   
               
               
                   
                   
                 (12, . . . 8800, . . .) 
                 represents a 
                   
                   
               
               
                   
                   
                   
                 PRB in a 
                   
                   
               
               
                   
                   
                   
                 subframe, for 
                   
                   
               
               
                   
                   
                   
                 which the value 
                   
                   
               
               
                   
                   
                   
                 “xx” indicates 
                   
                   
               
               
                   
                   
                   
                 how the 
                   
                   
               
               
                   
                   
                   
                 Effective 
                   
                   
               
               
                   
                   
                   
                 radiated 
                   
                   
               
               
                   
                   
                   
                 transmission 
                   
                   
               
               
                   
                   
                   
                 power in a 
                   
                   
               
               
                   
                   
                   
                 resource block 
                   
                   
               
               
                   
                   
                   
                 is mapped 
                   
                   
               
               
                   
                   
                   
                 relative to the 
                   
                   
               
               
                   
                   
                   
                 three power 
                   
                   
               
               
                   
                   
                   
                 thresholds: 
                   
                   
               
               
                   
                   
                   
                 00 - Effective 
                   
                   
               
               
                   
                   
                   
                 radiated TX 
                   
                   
               
               
                   
                   
                   
                 power level not 
                   
                   
               
               
                   
                   
                   
                 exceeding the 
                   
                   
               
               
                   
                   
                   
                 LPTH 
                   
                   
               
               
                   
                   
                   
                 01 - Effective 
                   
                   
               
               
                   
                   
                   
                 radiated TX 
                   
                   
               
               
                   
                   
                   
                 power level 
                   
                   
               
               
                   
                   
                   
                 between LPTH 
                   
                   
               
               
                   
                   
                   
                 and MPTH; 
                   
                   
               
               
                   
                   
                   
                 10 - Effective 
                   
                   
               
               
                   
                   
                   
                 radiated TX 
                   
                   
               
               
                   
                   
                   
                 power level 
                   
                   
               
               
                   
                   
                   
                 between 
                   
                   
               
               
                   
                   
                   
                 MPTH and 
                   
                   
               
               
                   
                   
                   
                 HPTH: 
                   
                   
               
               
                   
                   
                   
                 11 - no 
                   
                   
               
               
                   
                   
                   
                 promise on the 
                   
                   
               
               
                   
                   
                   
                 Effective 
                   
                   
               
               
                   
                   
                   
                 radiated TX 
                   
                   
               
               
                   
                   
                   
                 power is given. 
                   
                   
               
               
                   
                   
                   
                 The first 2 bits 
                   
                   
               
               
                   
                   
                   
                 correspond to 
                   
                   
               
               
                   
                   
                   
                 PRB 0 of the 
                   
                   
               
               
                   
                   
                   
                 first subframe 
                   
                   
               
               
                   
                   
                   
                 for which the IE 
                   
                   
               
               
                   
                   
                   
                 is valid, the 
                   
                   
               
               
                   
                   
                   
                 following 2 bits 
                   
                   
               
               
                   
                   
                   
                 correspond to 
                   
                   
               
               
                   
                   
                   
                 PRB 1 of the 
                   
                   
               
               
                   
                   
                   
                 first subframe 
                   
                   
               
               
                   
                   
                   
                 for which the IE 
                   
                   
               
               
                   
                   
                   
                 is valid, and so 
                   
                   
               
               
                   
                   
                   
                 on. 
                   
                   
               
               
                   
                   
                   
                 The bit string 
                   
                   
               
               
                   
                   
                   
                 may span 
                   
                   
               
               
                   
                   
                   
                 across multiple 
                   
                   
               
               
                   
                   
                   
                 contiguous 
                   
                   
               
               
                   
                   
                   
                 subframes. 
                   
                   
               
               
                   
                   
                   
                 The length of 
                   
                   
               
               
                   
                   
                   
                 the bit string is 
                   
                   
               
               
                   
                   
                   
                 an integer 
                   
                   
               
               
                   
                   
                   
                 (maximum 40) 
                   
                   
               
               
                   
                   
                   
                 multiple of, 
                   
                   
               
               
                   
                   
                   
                 N RB   DL  which is 
                   
                   
               
               
                   
                   
                   
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.211 [10]. 
                   
                   
               
               
                   
                   
                   
                 The Enhanced 
                   
                   
               
               
                   
                   
                   
                 RNTP pattern 
                   
                   
               
               
                   
                   
                   
                 is continuously 
                   
                   
               
               
                   
                   
                   
                 repeated 
                   
                   
               
               
                 &gt; Enhanced 
                   
                   
                   
                   
                   
               
               
                 RNTP 
                   
                   
                   
                   
                   
               
               
                 thresholds 
                   
                   
                   
                   
                   
               
               
                 &gt;&gt;LPTH (Low 
                 M 
                 ENUMERATED 
                 Lower RNTP 
                 — 
                 — 
               
               
                 Power 
                   
                 (−∞, −11, 
                 power 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 threshold, 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 using the 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.213 [11]. 
                   
                   
               
               
                 &gt;&gt;MPTH 
                 M 
                 ENUMERATED 
                 Medium RNTP 
                   
                   
               
               
                 (Medium 
                   
                 (−∞,−11, 
                 power 
                   
                   
               
               
                 Power 
                   
                 −10, −9, −8, 
                 threshold, 
                   
                   
               
               
                 Threshold) 
                   
                 −7, −6, −5, −4, 
                 using the 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.213 [11]. 
                   
                   
               
               
                 &gt;&gt;HPTH 
                 M 
                 ENUMERATED 
                 Higher RNTP 
                   
                   
               
               
                 (High Power 
                   
                 (−∞, −11, 
                 power 
                   
                   
               
               
                 Threshold) 
                   
                 −10, −9, −8, 
                 threshold, 
                   
                   
               
               
                   
                   
                 −7, −6, −5, −4, 
                 using the 
                   
                   
               
               
                   
                   
                 −3, −2, −1, 0, 
                 RNTP threshold   
                   
                   
               
               
                   
                   
                 1, 2, 3, . . .) 
                 defined in TS 
                   
                   
               
               
                   
                   
                   
                 36.213 [11]. 
               
               
                   
               
             
          
         
       
     
         [0341]    Alternative structure for subband indexing: 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE G3 
               
               
                   
               
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
             
             
               
                 CSI Report per UE 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID of the UE 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 served by the cell 
               
               
                   
                   
                   
                   
                 in eNB 2 . 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt; UE-CSI process 
                 M 
                 FFS 
                 FFS 
                 CSI process 
               
               
                 Configuration index 
                   
                   
                   
                 configuration 
               
               
                   
                   
                   
                   
                 information. 
               
               
                 &gt;&gt; Reference type per  
                   
                 1 . . .  
                   
                   
               
               
                 CSI process 
                   
                 &lt;maxReferenceTypes&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;Reference Type 
                 M 
                   
                 ENUMERATED 
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER (1 . . .  
                 Defined in TS 
               
               
                   
                   
                   
                 8, . . . ) 
                 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;&gt;Subband CQI List 
                   
                 0 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband CQI 
                 O 
                   
                 9.2.cc 
                 If this IE is not 
               
               
                   
                   
                   
                   
                 present, the CQI is 
               
               
                   
                   
                   
                   
                 identical to the one 
               
               
                   
                   
                   
                   
                 provided for the 
               
               
                   
                   
                   
                   
                 last preceding 
               
               
                   
                   
                   
                   
                 subband. This IE 
               
               
                   
                   
                   
                   
                 is always present 
               
               
                   
                   
                   
                   
                 for the first 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                 &gt;&gt;&gt;&gt;Subband Start 
                 O 
                   
                 INTEGER 
                 Corresponds to 
               
               
                   
                   
                   
                 (2 . . . 109, . . . ) 
                 the PRB number 
               
               
                   
                   
                   
                   
                 of the first PRB in 
               
               
                   
                   
                   
                   
                 a subband defined 
               
               
                   
                   
                   
                   
                 in TS 36.213 [11] 
               
               
                   
                   
                   
                   
                 for the system 
               
               
                   
                   
                   
                   
                 bandwidth. If this IE 
               
               
                   
                   
                   
                   
                 is not present, the 
               
               
                   
                   
                   
                   
                 subband is 
               
               
                   
                   
                   
                   
                 contiguous with 
               
               
                   
                   
                   
                   
                 the previous 
               
               
                   
                   
                   
                   
                 subband in the list, 
               
               
                   
                   
                   
                   
                 or starts with PRB 
               
               
                   
                   
                   
                   
                 0 if this is the first 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                 &gt;&gt;&gt;&gt;Subband Size 
                 O 
                   
                 ENUMERATED  
                 Corresponds to a 
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 value of subband 
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in 
               
               
                   
                   
                   
                   
                 TS 36.213 [11] for 
               
               
                   
                   
                   
                   
                 the system 
               
               
                   
                   
                   
                   
                 bandwidth. 
               
               
                   
                   
                   
                   
                 Ignored for the 
               
               
                   
                   
                   
                   
                 highest frequency 
               
               
                   
                   
                   
                   
                 subband. If this IE 
               
               
                   
                   
                   
                   
                 is not present, the 
               
               
                   
                   
                   
                   
                 size is identical to 
               
               
                   
                   
                   
                   
                 the one provided 
               
               
                   
                   
                   
                   
                 for the last 
               
               
                   
                   
                   
                   
                 preceding 
               
               
                   
                   
                   
                   
                 subband. This IE 
               
               
                   
                   
                   
                   
                 is always present 
               
               
                   
                   
                   
                   
                 for the first 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                   
               
             
          
         
       
     
       Embodiment H 
     H1. Introduction 
       [0342]    In RAN3#88, after fruitful discussions on the exchange of CSI, a subband indexing scheme has been selected in the baseline CR (change request) [4]. In this document we identify some corrections that can be made and present them in a proposal. 
       H2. Discussion 
       [0343]    A desirable feature that should be supported by a CSI signaling scheme is the exchange of both periodic and aperiodic CSI reports in the same X2 message. In the absence of this feature, i.e., when the sending eNB is forced to choose either the periodic or the aperiodic CSI report obtained under a CSI process of some user, the sending eNB will have to drop available CSI reports. This would be unfortunate given that precious over-the-air signaling resources have already been spent in acquiring these reports and that these reports can together convey more CSI that either individual one. 
         [0344]    Accepting this view an indexing scheme to enable this feature has been selected in [4]. 
         [0345]    We identify two corrections and an improvement that can be made to the selected scheme: 
         [0346]    Correction: Changing the subband index range to (0, . . . 27, . . . } from {0, . . . , 13, . . . }: 
         [0347]    A benefit that can be obtained from the subband indexing scheme of [4] is the simple forwarding of both aperiodic and periodic CSI reports in the same X2 message. Notice that the maxSubband value is 14 and the subband index range is defined to be {0, . . . , 13, . . . }. This choice allows for simple forwarding with any configured periodic mode and when the configured a-periodic mode is 3-*. This is because in these cases the maximum number of subband reports is 14 and the index range spans {0, . . . , 13}, consistent with the agreed choice. 
         [0348]    However, this choice will not allow the same X2 message to include aperiodic CSI report configured with feedback mode 2-* and periodic CSI report configured under any mode. This is because under aperiodic mode 2-*, when the total number of PRBs in the downlink is N RB   DL =110, the subband size is k=4 and the number of UE selected subbands is M=6 (Table 7.2.1.5 in TS36.213). Thus, we have N=28 subbands (110=4*27+2) and the UE is free to select any 6 out of these 28 subbands as its preferred ones. Consequently, the subband index identifying each UE selected subband must belong to the set {0, . . . , 27}. 
         [0349]    Consequently, one of the two CSI process items should have a subband index range of {0, . . . , 27}. For simplicity we suggest a common subband index range of {0, . . . , 27} for both CSI process items. A slightly more efficient alternative could be where one of the two CSI process items (say CSI process item 1) has index range {0, . . . , 27} whereas the other one has index range {0, . . . , 13}. 
         [0350]    2) Correction: Changing the semantic description to reflect that a different RI and CQI combination can be reported for each one of the two CSI process items under the same CSI process. 
         [0351]    3) Improvement: Making the subband CQI IE optional with a clarification in the semantic description. 
         [0352]    The subband CQIs are conveyed sequentially in the increasing order of subband indices. Then, in case the subband CQI IE for a subband is not conveyed, the receiving eNB must use the CQI conveyed for the last preceding subband. The CQI for the first subband must always be included. This approach can significantly save overhead by avoiding redundancy. Note that when a UE is configured in the aperiodic mode 2-*, it selects and reports indices for M out of N subbands. However, only one CQI (per codeword) is reported by it for all the M selected subbands. Therefore, it is beneficial that redundancy is avoided in reporting such CQIs in the X2 message as well. 
       H3. Conclusion 
       [0353]    We identified three improvements that can be made in the UE-CSI IE and present them in a proposal. 
         [0354]    9.2.aa UE-CSI Report 
         [0355]    This IE provides CSI reports of UEs served by the cell for which the information is provided. 
         [0000]    
       
         
               
               
               
               
               
             
               
               
             
           
               
                 TABLE H1 
               
               
                   
               
             
             
               
                   
                   
                   
                 IE type and 
                 Semantics 
               
               
                 IE/Group Name 
                 Presence 
                 Range 
                 reference 
                 description 
               
               
                   
               
               
                 CSI Report per Cell 
                   
                 1 . . .  
                   
                   
               
               
                   
                   
                 &lt;maxUEReport&gt; 
                   
                   
               
               
                 &gt;UE ID 
                 M 
                   
                 BIT STRING 
                 ID assigned by 
               
               
                   
                   
                   
                 (SIZE(16)) 
                 eNB2 for the UE. 
               
               
                 &gt;CSI Report per CSI 
                   
                 1 . . .  
                   
                   
               
               
                 Process 
                   
                 &lt;maxCSIProcess&gt; 
                   
                   
               
               
                 &gt;&gt;CSI Process 
                 M 
                   
                 FFS 
                   
               
               
                 Configuration Index 
                   
                   
                   
                   
               
               
                 &gt;&gt;CSI Report per 
                   
                 1 . . .  
                   
                   
               
               
                 CSI Process Item 
                   
                 &lt;maxCSIReport&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;RI 
                 M 
                   
                 INTEGER 
                 The RI 
               
               
                   
                   
                   
                 (1 . . . 8, . . . ) 
                 corresponding to the 
               
               
                   
                   
                   
                   
                 CQI being reported 
               
               
                   
                   
                   
                   
                 for this CSI process 
               
               
                   
                   
                   
                   
                 Item. Value defined 
               
               
                   
                   
                   
                   
                 in TS 36.213 [11]. 
               
               
                 &gt;&gt;&gt;Wideband CQI 
                 M 
                   
                 9.2.bb 
                   
               
               
                 &gt;&gt;&gt;Subband Size 
                 M 
                   
                 ENUMERATED  
                 Corresponds to a 
               
               
                   
                   
                   
                 (2, 3, 4, 6,  
                 value of subband 
               
               
                   
                   
                   
                 8, . . . ) 
                 size k defined in TS 
               
               
                   
                   
                   
                   
                 36.213 [11]for the 
               
               
                   
                   
                   
                   
                 system bandwidth 
               
               
                   
                   
                   
                   
                 N RB   DL   
               
               
                 &gt;&gt;&gt;Subband CQI 
                   
                 0 . . .  
                   
                   
               
               
                 List 
                   
                 &lt;maxSubband&gt; 
                   
                   
               
               
                 &gt;&gt;&gt;&gt;Subband 
                 O 
                   
                 9.2.cc 
                 If this IE is not 
               
               
                 CQI 
                   
                   
                   
                 present, the CQI is 
               
               
                   
                   
                   
                   
                 identical to the one 
               
               
                   
                   
                   
                   
                 provided for the last 
               
               
                   
                   
                   
                   
                 preceding subband. 
               
               
                   
                   
                   
                   
                 This IE is always 
               
               
                   
                   
                   
                   
                 present for the first 
               
               
                   
                   
                   
                   
                 subband in the list. 
               
               
                 &gt;&gt;&gt;&gt;Subband 
                 M 
                   
                 INTEGER (0 . . .  
                   
               
               
                 Index 
                   
                   
                 27, . . . ) 
               
               
                   
               
             
          
           
               
                 Range bound 
                 Explanation 
               
               
                   
               
               
                 maxUEReport 
                 Maximum number of UE. Value is 128. 
               
               
                 maxCSIProcess 
                 Maximum number of CSI processes per UE. The value is 4. 
               
               
                 maxCSIReport 
                 Maximum number of CSI Reports per CSI Process. The value 
               
               
                   
                 is 2. 
               
               
                 maxSubband 
                 Maximum number of subbands. The value is 14. 
               
               
                   
               
             
          
         
       
     
         [0356]    The foregoing is to be understood as being in every respect illustrative and exemplary, but not restrictive, and the scope of the invention disclosed herein is not to be determined from the Detailed Description, but rather from the claims as interpreted according to the full breadth permitted by the patent laws. It is to be understood that the embodiments shown and described herein are only illustrative of the principles of the present invention and that those skilled in the art may implement various modifications without departing from the scope and spirit of the invention. Those skilled in the art could implement various other feature combinations without departing from the scope and spirit of the invention.