PATENT DOCUMENT

Publication Number: US-10666334-B2
Application Number: US-201515746983-A
Country: US
Kind Code: B2

Title: Beamforming training reference signal design

Abstract:
In one example, an apparatus of an e-NodeB (eNB) capable to establish a communication connection with a user equipment (UE) in a communication network, the eNB comprising processing circuitry to transmit a downlink (DL) beamforming training reference signal (BF-TRS) to a user equipment (UE) using transmit beamforming weights that are the same. Other examples are also disclosed and claimed.

Claims:
The invention claimed is: 
     
       1. An apparatus of an e-NodeB (eNB) capable to establish a communication connection with a user equipment (UE) in a 5G communication network, the eNB comprising processing circuitry to:
 generate a physical downlink control channel xPDCCH (5G Physical Downlink Control Channel) comprising a bit indicator which indicates to transmit a beamforming training reference signal (BF-TRS) to a user equipment (UE); 
 in response to the xPDCCH, to calculate a subframe gap to be inserted between the xPDCCH and transmission of the BF-TRS; and 
 transmit, after the subframe gap, a downlink (DL) beamforming training reference signal (BF-TRS) to the user equipment (UE) using transmit beamforming weights that are the same, wherein an interleaved FDMA (IFDMA) signal structure is used to generate the DL BF-TRS in which the DL BF-TRS symbols are mapped into every two (2) subcarriers in the frequency domain, while remaining subcarriers are set to zero. 
 
     
     
       2. The apparatus of  claim 1 , wherein the DL BF-TRS is transmitted in one subframe or in a plurality of subframes. 
     
     
       3. The apparatus of  claim 1 , wherein the DL BF-TRS is transmitted in X symbols, where X is predefined or configured by higher layers via a 5G master information block (xMIB), a 5G system information block (xSIB), or a UE specific RRC signaling. 
     
     
       4. The apparatus of  claim 3 , wherein the communication system has a bandwidth which is divided into a number (L) sub-bands, and wherein:
 each sub-band is used for one Tx beamformed BF-TRS transmission for a single UE; 
 the number (L) of sub-bands is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB; and 
 a resource allocation configuration for the UE is signaled in dedicated RRC signaling or indicated in DCI format for DL assignment. 
 
     
     
       5. The apparatus of  claim 3 , wherein DL BF-TRS is transmitted in a physical resource block (PRB) which is also used for the transmission of a physical downlink shared channel (xPDSCH) in the event that the BF-TRS is triggered by an xPDCCH. 
     
     
       6. The apparatus of  claim 3 , wherein:
 BF-TRS patterns are transmitted using at least one of a distributed transmission procedure or a localized transmission procedure; 
 a number (K) subcarriers are used to define a gap between adjacent BF-TRS symbols; and 
 K is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
 
     
     
       7. The apparatus of  claim 3 , wherein the DL BF-TRS sequence is defined by: 
       
         
           
             
               
                 
                   
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         where n s  can be a number of a slot or a subframe within a radio frame and l is an OFDM symbol number within the slot or the subframe. 
       
     
     
       8. The apparatus of  claim 7 , wherein the DL BF-TRS sequence is generated in a pseudo-random sequence generator initialized as a function of at least one of n s , a physical cell ID, a virtual physical cell ID, an indication of a normal cyclic prefix (CP) and extended CP. 
     
     
       9. The apparatus of  claim 1 , wherein the DL BF-TRS is triggered in an aperiodic manner by a physical downlink control channel (xPDCCH). 
     
     
       10. The apparatus of  claim 9 , wherein:
 a predetermined subframe gap is inserted between the xPDCCH and the transmission of DL and/or UL BF-TRS; and 
 the gap is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
 
     
     
       11. The apparatus of  claim 9 , wherein:
 the DL BF-TRS is transmitted a number K′ subframes after ACK or NACK feedback from a UE; and 
 the number K′ is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
 
     
     
       12. The apparatus of  claim 9 , wherein:
 the DL BF-TRS is enabled for a first Hybrid automatic repeat request (HARQ) process and is disabled for a second HARQ process; and 
 the first HARQ process and the second HARQ process is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
 
     
     
       13. The apparatus of  claim 1 , wherein the DL BF-TRS is transmitted in a periodic manner. 
     
     
       14. The apparatus of  claim 13 , wherein the DL BF-TRS is transmitted in one or more subframes which are defined as downlink in a time-division duplex (TDD) system satisfying the condition: 
       
         
           
             
               
                 
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         where n f  is a radio frame number, n s  is a slot number; N OFFSET,TRS  is the frame offset and TRS PERIODICITY  is the periodicity of the BF-TRS transmission. 
       
     
     
       15. The apparatus of  claim 14 , wherein N OFFSET,TRS  and TRS PERIODICITY  are defined by a parameter l TRS , which is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
     
     
       16. An apparatus of a user equipment (UE) capable to establish a communication connection with an eNB, the UE comprising processing circuitry to:
 detect a physical downlink control channel xPDCCH (5G Physical Downlink Control Channel) comprising a bit indicator which indicates to transmit a beamforming training reference signal (BF-TRS) to an eNB; 
 in response to the xPDCCH, to calculate a subframe gap to be inserted between the xPDCCH and transmission of the BF-TRS; and 
 transmit, after the subframe gap, an uplink (UL) beamforming training reference signal (BF-TRS) to the eNB using transmit beamforming weights that are different, wherein an interleaved FDMA (IFDMA) signal structure is used to generate the UL BF-TRS in which the UL BF-TRS symbols are mapped into every two (2) subcarriers in the frequency domain, while remaining subcarriers are set to zero. 
 
     
     
       17. The apparatus of  claim 16 , wherein the UL BF-TRS is transmitted in a number (X) symbols within one subframe or transmitted in one or a plurality of subframes. 
     
     
       18. The apparatus of  claim 16 , wherein the UL BF-TRS is transmitted in a frequency division multiplexing (FDM) manner for multiple UEs. 
     
     
       19. The apparatus of  claim 16 , wherein the UE performs a transmit beamforming sweep on a number (N) BF-TRS repetition blocks based on an IFDMA structure. 
     
     
       20. The apparatus of  claim 16 , wherein the UL BF-TRS is transmitted in a physical resource block (PRB) which is also used for the transmission of a physical uplink control channel (xPUCCH) for the UE. 
     
     
       21. The apparatus of  claim 16 , wherein the UL BF-TRS sequence is defined by: 
       
         
           
             
               
                 
                   
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         where n s  can be a number of a slot or a subframe within a radio frame and l is an OFDM symbol number within the slot or the subframe. 
       
     
     
       22. The apparatus of  claim 21 , wherein:
 the UL BF-TRS sequence is generated in a pseudo-random sequence generator initialized as a function of at least one of n s , a physical cell ID, a virtual physical cell ID, an indication of a normal cyclic prefix (CP) and extended CP; and 
 the pseudo-random sequence generator may be defined as a function of a Cell Radio Network Temporary Identifier (C-RNTI) and/or a Demodulation reference symbol (DM-RS) index used for the transmission of a physical uplink shared control channel (xPUSCH).

Description:
RELATED APPLICATIONS 
     This application claims the benefit of priority under 35 U.S.C. § 371 to International Application No. PCT/US2015/065341 filed Dec. 11, 2015, entitled BEAMFORMING TRAINING REFERENCE SIGNAL DESIGN which in turn claims the benefit of priority under 35 U.S.C. § 119(e) of U.S. Provisional Application Ser. No. 62/206,427, filed Aug. 18, 2015, entitled BEAMFORMING TRAINING REFERENCE SIGNAL DESIGN FOR 5G SYSTEM, the disclosures of which are incorporated herein by reference in their entirety. 
    
    
     FIELD 
     The present disclosure generally relates to the field of electronic communication. More particularly, aspects generally relate to a beamforming training reference design for use in communication systems. 
     BACKGROUND 
     Wireless communication systems which utilize mid-band (e.g., 6 GHz to 30 GHz) and high-band (e.g., over 30 GHz) frequency ranges may utilize beamforming techniques to compensate for relatively large path loss incurred during transmission between an eNodeB (eNB) and one or more user equipment (UE). Accordingly, techniques for transmit beamforming may find utility, e.g., in electronic communication systems for electronic devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description is provided with reference to the accompanying figures. The use of the same reference numbers in different figures indicates similar or identical items. 
         FIGS. 1-2  are flowcharts illustrating operations in a method to implement transmit beam forming in a communication system in accordance with various examples discussed herein. 
         FIG. 3  is a diagram illustrating a downlink beamforming training reference signal in a communication system in accordance with various examples discussed herein. 
         FIGS. 4A and 4B  are schematic illustrations of sub-band structures which may be used in a method to implement transmit beam forming in a communication system in accordance with various examples discussed herein. 
         FIGS. 5A and 5B  are schematic illustrations of transmission patterns for a beamforming training reference signal in a communication system in accordance with various examples discussed herein. 
         FIGS. 6A and 6B  are schematic illustrations of transmission patterns for a beamforming training reference signal in a communication system in accordance with various examples discussed herein. 
         FIG. 7  is a diagram illustrating timing of an uplink beamforming training reference signal transmissions in a communication system in accordance with various examples discussed herein. 
         FIGS. 8A-8B  are diagrams illustrating timing of an uplink beamforming training reference signal transmissions in a communication system in accordance with various examples discussed herein. 
         FIG. 9  is a schematic, block diagram illustration of a wireless network in accordance with one or more exemplary embodiments disclosed herein. 
         FIG. 10  is a schematic, block diagram illustration of a 3GPP LTE network in accordance with one or more exemplary embodiments disclosed herein. 
         FIGS. 11 and 12  are schematic, block diagram illustrations, respectively, of radio interface protocol structures between a UE and an eNodeB based on a 3GPP-type radio access network standard in accordance with one or more exemplary embodiments disclosed herein. 
         FIG. 13  is a schematic, block diagram illustration of an information-handling system in accordance with one or more exemplary embodiments disclosed herein. 
         FIG. 14  is an isometric view of an exemplary embodiment of the information-handling system of  FIG. 13  that optionally may include a touch screen in accordance with one or more embodiments disclosed herein. 
         FIG. 15  is a schematic, block diagram illustration of components of a representative UE in accordance with one or more exemplary embodiments disclosed herein. 
     
    
    
     It will be appreciated that for simplicity and/or clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, if considered appropriate, reference numerals have been repeated among the figures to indicate corresponding and/or analogous elements. 
     DETAILED DESCRIPTION 
     In the following description, numerous specific details are set forth in order to provide a thorough understanding of various examples. However, various examples may be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to obscure the particular examples. Further, various aspects of examples may be performed using various means, such as integrated semiconductor circuits (“hardware”), computer-readable instructions organized into one or more programs (“software”), or some combination of hardware and software. For the purposes of this disclosure reference to “logic” shall mean either hardware, software, or some combination thereof. 
     Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments. Additionally, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not to be construed as necessarily preferred or advantageous over other embodiments. 
     Various operations may be described as multiple discrete operations in turn and in a manner that is most helpful in understanding the claimed subject matter. The order of description, however, should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations need not be performed in the order of presentation. Operations described may be performed in a different order than the described embodiment. Various additional operations may be performed and/or described operations may be omitted in additional embodiments. 
     As described in brief above, techniques for transmit beamforming may find utility, e.g., in wireless communication systems for electronic devices. Subject matter described herein provides techniques to implement transmit beamforming for transmissions between an eNB and one or more UE. More particularly, described herein are design features for downlink (DL) beamforming training reference signal (BF-TRS), design features for uplink (UL) BF-TRS, and various mechanisms to trigger a transmission of the BF-TRS from either an eNB or a UE. Additional features and characteristics these techniques and communication systems in which the techniques may be incorporated are described below with reference to  FIGS. 1-15 . 
       FIG. 1  is a flowchart illustrating operations in a method to implement DL transmit beamforming in a communication system in accordance with various examples discussed herein. Referring to  FIG. 1 , at operation  110  an eNB transmits a DL BF-TRS to a UE by employing UE-specific transmission weights. In order to enable UE Rx beamforming training, a predetermined beamforming pattern or UE assumption may be utilized. In one example, Tx beamforming patterns for the transmission DL BF-TRS may be repeated periodically (e.g., every X milliseconds), where X can be predefined in a specification or configured by higher layers of a communication network via UE-specific dedicated radio resource control (RRC) signalling from a primary cell (PCell). In this case, a UE may perform receive beam scanning on the PSS and/or BRS positions with the same Tx beamforming weights. In one example, the DL BF-TRS can be transmitted in either one or a in a plurality of subframes. This may be appropriate for the scenario when BF-TRS is transmitted in a periodic manner. 
     At operation  115  the UE performs receive beam training which, at operation  120 , determines one or more suitable beamforming patterns for Tx beamforming from the eNB. In some examples the UE identifies the beamforming pattern(s) which provides the strongest reception as the best eNB Tx beam. The one or more suitable Tx beamforming patterns, including the best beamforming pattern(s), are transmitted from the UE to the eNB. Depending on the beamforming pattern applied for the Tx of DL-BF-TRS, it may be up to UE implementation to determine the best eNB Tx and UE receive beam pair to maximize the receive power. Further, the UE may report the best eNodeB Tx beam index (or indexes) via PRACH or in the PUSCH transmission in the RACH procedure. At operation  125  the eNB receives the suitable beamforming pattern(s) from the UE. The eNB may use one or more of the beamforming patterns received from the UE in subsequent transmissions to the UE. In some examples, e.g., when the eNB uses the same Tx beam to transmit DL BF-TRS, operation  125  may not be required. 
       FIG. 2  is a flowchart illustrating operations in a method to implement DL transmit beamforming in a communication system in accordance with various examples discussed herein. Referring to  FIG. 2 , at operation  210  the UE initiates a transmission of the Tx beamformed PRACH. In some examples the UE transmits the UL BF-TRS using different beamforming weights. At operation  215 , the eNB performs receive beam training which, at operation  220 , determines one or more suitable beamforming patterns for Tx beamforming from the UE. The eNB transmits the beam index (or indices) associated with the suitable beams using the xPDCCH, or dedicated RRC signaling. In a single frequency network type of operation, one eNB may feedback multiple suitable Tx beams from multiple eNBs. The UE may use one or more of the beamforming patterns received from the eNB in subsequent transmissions to the eNB. 
     In some examples, in order to reduce the amount of overhead consumed by beamforming training, the BF-TRS may be transmitted in a number (X) symbols, where X can be predefined or configured by higher protocol layers via a 5G master information block (xMIB), a 5G system information block (xSIB) or UE-specific RRC signaling. In one example, X=2 and the BF-TRS is transmitted in the last two symbols within one subframe.  FIG. 3  illustrates one example of DL BF-TRS transmission position. In other examples the DL BF-TRS can be transmitted in the first X symbols within one subframe. 
     In some examples an interleaved FDMA (IFDMA) signal structure may be used to generate a DL BF-TRS signal. In particular, BF-TRS symbols are mapped in every K subcarrier(s) in the frequency domain, while the remaining subcarriers are set to zero. This IFDMA structure with a Repetition Factor (RPF) of K would create K repeated blocks in the time domain. It may be useful to define K=2 N  in order to keep the same or integer number of sampling rate, where N&gt;1 is an integer. 
     In one example, when K=2, BF-TRS symbols are mapped to every even subcarrier, which creates two repeated blocks in the time domain. 
     Within one or fractional symbol duration, system bandwidth may be divided into a number (L) sub-bands. Each sub-band may be used for one Tx beamformed BF-TRS transmission. The number of sub-bands may depend on the eNB architecture and can be predefined or configured by higher layers via xMIB, xSIB or UE specific dedicated RRC signaling either from a Pcell or a serving cell eNB. Each sub-band may be allocated for each UE for Rx beamforming training. The resource allocation configuration for each UE can be signaled in dedicated RRC signaling or indicated in DCI format for DL assignment. 
     Alternatively, an eNB may transmit the DL BF-TRS in the same physical resource block (PRB) that is also used for the transmission of a 5G physical downlink shared channel (xPDSCH) in the case when BF-TRS is triggered by xPDCCH. 
       FIG. 4  illustrates the Tx beamformed sub-band structure for a BF-TRS transmission when L=4. In the figure, both localized and distributed transmission schemes can be used for the transmission of BF-TRS signal. In the example depicted in  FIG. 4 , Tx beamformed sub-band #1 and #2 may be allocated for UE #1 and #2, respectively. 
       FIG. 5  and  FIG. 6  illustrate the BF-TRS patterns for distributed and localized transmission of BF-TRS patterns, respectively. For both transmission modes, the gap between two BF-TRS symbols is K subcarriers. Further, for BF-TRS across multiple subframes, the resource used for the transmission of BF-TRS may follow a scattered pattern (as shown in  FIG. 6  A) and may be same in the frequency (as shown in  FIG. 6B ) 
     In some examples the DL BF-TRS sequence r l,n     s   (m) is defined by: 
     
       
         
           
             
               
                 
                   
                     
                       
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     where n s  can be a slot number or a subframe number within a radio frame and is the OFDM symbol number within the slot or the subframe, respectively. One example of a pseudo-random sequence c(i) is defined in Section 7.2 [1] of the LTE specification. 
     In one example, the pseudo-random sequence generator may be initialized as a function of slot/subframe number and/or the OFDM symbol number and/or physical cell ID or virtual physical cell ID and/or indication of normal cyclic prefix (CP) and extended CP. 
     In one example, the same design for the generation of channel state information-reference signal (CSI-RS) can be reused for the generation of BF-TRS sequence, i.e., the pseudo-random sequence generator shall be initialized with
 
 c   init =2 10 ·(7·( n   s +1)+ l+ 1)·(2· n   ID +1)+2· n   ID   +N   CP   EQ: 2
 
     at the start of each OFDM symbol where 
     
       
         
           
             
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     The quantity n ID  equals N ID   cell  unless configured by higher protocol layers. 
       FIG. 7  illustrates one example of UL BF-TRS transmission. Similar to the DL BF-TRS, an UL BF-TRS may be transmitted in X symbols within one subframe or transmitted in one or a plurality of subframes. In the example depicted in  FIG. 7 , the UL BF-TRS is transmitted in the last two symbols of one subframe following 5G physical uplink shared channel (xPUSCH). Further, a number (M) UEs are multiplexed in a frequency division multiplexing (FDM) manner. Additionally, the UE performs Tx beamforming sweep on a number (N) BF-TRS blocks based on IFDMA structure as described above. 
     Alternatively, the UL BF-TRS may be transmitted in the same PRB as used for the transmission of xPUSCH for one UE. 
     The design principle for the generation of DL BF-TRS can also be applied for the generation of the UL BF-TRS. In some examples, an IFDMA structure can be employed for the UL BF-TRS. 
     Further, the UL BF-TRS sequence can be defined similar to UL BF-TRS. In some examples the pseudo-random sequence generator may be initialized as a function of slot/subframe number and/or OFDM symbol number and/or physical cell ID or virtual physical cell ID and/or indication of normal cyclic prefix (CP) and extended CP. 
     In addition, the pseudo-random sequence generator may be defined as a function of Cell Radio Network Temporary Identifier (C-RNTI) and/or the Demodulation reference symbol (DM-RS) index used for the transmission of xPUSCH. 
     One or more implementations may be used to trigger the transmission of BF-TRS. In a first example, a BF-TRS can be triggered in an aperiodic manner. For example, the BF-TRS can be triggered by a 5G physical downlink control channel (xPDCCH). Further, one field in the DCI format for DL assignment can be used for BF-TRS triggering, e.g., a bit “1” indicates B-TRS is transmitted while a bit “0” indicates BF-TRS is not transmitted. 
     For the transmission of DL BF-TRS, given that UE may need to take certain amount of processing time to decode xPDCCH, the UE may not know whether the DL BF-TRS is transmitted or when to start Rx beamforming scanning until the xPDCCH is successfully decoded. To address this issue, a certain subframe gap may be inserted between the xPDCCH and the transmission of DL BF-TRS, which would take into account the xPDCCH processing time. More specifically, an xPDCCH in subframe n can be used to schedule the transmission of DL BF-TRS in subframe n+K0, where K0 can be predefined in the specification or can be configured by the higher layers via xMIB, xSIB or UE specific dedicated RRC signalling. 
     To avoid xPDCCH misdetection, the eNB may transmit the DL BF TRS after the ACK or NACK feedback. Then the DL BF-TRS may be transmitted in subframe n′+K0, where n′ is the UL subframe when ACK or NACK is for subframe n is transmitted. Unless detecting the DTX, the eNodeB may transmit the DL BF TRS at the corresponding subframes. 
       FIG. 7  illustrates one example of the transmission timing of the DL BF-TRS triggered by xPDCCH. In this example, the subframe gap between xPDCCH and BF-TRS is 3, i.e., K0=3. 
     The same design principle can be applied for the triggering of UL BF-TRS by xPDCCH. UL BF-TRS can be transmitted K1 subframes after the xPDCCH. Similarly, K1 can be predefined in the specification or can be configured by the higher layers via xMIB, xSIB or UE specific dedicated RRC signalling.  FIG. 8  illustrates one example of the transmission timing of the UL BF-TRS triggered by xPDCCH. In this example, the subframe gap between xPDCCH and BF-TRS is 4, i.e., K1=4. 
     Alternatively the UL BF-TRS may be enabled in some HARQ processes and for the others the UL BF-TRS may be disabled. The HARQ process IDs wherein UL BF-TRS is enabled may be configured via RRC signaling or may be predefined in the system. For example, for HARQ process 0, UL BF-TRS may be always transmitted. 
     In another embodiment of the invention, DL and UL BF-TRS can be transmitted in a periodic manner. More specifically, the subframes for the transmission of DL and UL BF-TRS are defined as the downlink subframes or special subframes in TDD system satisfying 
     
       
         
           
             
               
                 
                   
                     
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                               n 
                               S 
                             
                             2 
                           
                           ] 
                         
                         - 
                         
                           N 
                           
                             OFFSET 
                             , 
                             TRS 
                           
                         
                       
                       ) 
                     
                     ⁢ 
                     mod 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     
                       TRS 
                       PERIODICITY 
                     
                   
                   = 
                   0 
                 
               
               
                 
                   EQ 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   3 
                 
               
             
           
         
       
     
     where n f  and n s  are radio frame number and slot number; N OFFSET,TRS  and TRS PERIODICITY  are the subframe offset and periodicity of the BF-TRS transmission. 
     For instance, N OFFSET, TRS  and TRS PERIODICITY  are defined by the parameter I TRS , which is given in the Table 1. Note that other values of I TRS , N OFFSET, TRS  and TRS PERIODICITY  can be extended from the examples as shown in the Table 1. Further, a configuration index can be predefined or configured by higher layers via xMIB, xSIB or dedicated RRC signaling. In addition, DL and UL BF-TRS may be configured independently. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Periodicity and Subframe Offset Configuration for BF-TRS 
               
            
           
           
               
               
               
            
               
                   
                 Periodicity 
                 Subframe offset 
               
               
                 Configuration Index I TRS   
                 TRS PERIODICITY  (ms) 
                 N OFFSET,TRS   
               
               
                   
               
            
           
           
               
               
               
            
               
                 0-4 
                 5 
                 I TRS   
               
               
                  5-14 
                 10 
                 I TRS -5  
               
               
                 15-34 
                 20 
                 I TRS -15 
               
               
                 35-74 
                 40 
                 I TRS -35 
               
               
                  75-154 
                 80 
                 I TRS -75 
               
               
                   
               
            
           
         
       
     
       FIG. 9  is a schematic, block diagram illustration of a wireless network  900  in accordance with one or more exemplary embodiments disclosed herein. One or more of the elements of wireless network  900  may be capable of implementing methods to identify victims and aggressors according to the subject matter disclosed herein. As shown in  FIG. 9 , network  900  may be an Internet-Protocol-type (IP-type) network comprising an Internet-type network  910 , or the like, that is capable of supporting mobile wireless access and/or fixed wireless access to Internet  910 . 
     In one or more examples, network  900  may operate in compliance with a Worldwide Interoperability for Microwave Access (WiMAX) standard or future generations of WiMAX, and in one particular example may be in compliance with an Institute for Electrical and Electronics Engineers 802.16-based standard (for example, IEEE 802.16e), or an IEEE 802.11-based standard (for example, IEEE 802.11a/b/g/n standard), and so on. In one or more alternative examples, network  900  may be in compliance with a 3rd Generation Partnership Project Long Term Evolution (3GPP LTE), a 3GPP2 Air Interface Evolution (3GPP2 AIE) standard and/or a 3GPP LTE-Advanced standard. In general, network  900  may comprise any type of orthogonal-frequency-division-multiple-access-based (OFDMA-based) wireless network, for example, a WiMAX compliant network, a Wi-Fi Alliance Compliant Network, a digital subscriber-line-type (DSL-type) network, an asymmetric-digital-subscriber-line-type (ADSL-type) network, an Ultra-Wideband (UWB) compliant network, a Wireless Universal Serial Bus (USB) compliant network, a 4th Generation (4G) type network, and so on, and the scope of the claimed subject matter is not limited in these respects. 
     As an example of mobile wireless access, access service network (ASN)  912  is capable of coupling with base station (BS)  914  to provide wireless communication between subscriber station (SS)  916  (also referred to herein as a wireless terminal) and Internet  910 . In one example, subscriber station  916  may comprise a mobile-type device or information-handling system capable of wirelessly communicating via network  900 , for example, a notebook-type computer, a cellular telephone, a personal digital assistant, an M2M-type device, or the like. In another example, subscriber station is capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. ASN  912  may implement profiles that are capable of defining the mapping of network functions to one or more physical entities on network  900 . Base station  914  may comprise radio equipment to provide radio-frequency (RF) communication with subscriber station  916 , and may comprise, for example, the physical layer (PHY) and media access control (MAC) layer equipment in compliance with an IEEE 802.16e-type standard. Base station  914  may further comprise an IP backplane to couple to Internet  910  via ASN  912 , although the scope of the claimed subject matter is not limited in these respects. 
     Network  900  may further comprise a visited connectivity service network (CSN)  924  capable of providing one or more network functions including, but not limited to, proxy and/or relay type functions, for example, authentication, authorization and accounting (AAA) functions, dynamic host configuration protocol (DHCP) functions, or domain-name service controls or the like, domain gateways, such as public switched telephone network (PSTN) gateways or Voice over Internet Protocol (VoIP) gateways, and/or Internet-Protocol-type (IP-type) server functions, or the like. These are, however, merely example of the types of functions that are capable of being provided by visited CSN or home CSN  926 , and the scope of the claimed subject matter is not limited in these respects. 
     Visited CSN  924  may be referred to as a visited CSN in the case, for example, in which visited CSN  924  is not part of the regular service provider of subscriber station  916 , for example, in which subscriber station  916  is roaming away from its home CSN, such as home CSN  926 , or, for example, in which network  900  is part of the regular service provider of subscriber station, but in which network  900  may be in another location or state that is not the main or home location of subscriber station  916 . 
     In a fixed wireless arrangement, WiMAX-type customer premises equipment (CPE)  922  may be located in a home or business to provide home or business customer broadband access to Internet  910  via base station  920 , ASN  918 , and home CSN  926  in a manner similar to access by subscriber station  916  via base station  914 , ASN  912 , and visited CSN  924 , a difference being that WiMAX CPE  922  is generally disposed in a stationary location, although it may be moved to different locations as needed, whereas subscriber station may be utilized at one or more locations if subscriber station  916  is within range of base station  914  for example. 
     It should be noted that CPE  922  need not necessarily comprise a WiMAX-type terminal, and may comprise other types of terminals or devices compliant with one or more standards or protocols, for example, as discussed herein, and in general may comprise a fixed or a mobile device. Moreover, in one exemplary embodiment, CPE  922  is capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. 
     In accordance with one or more examples, operation support system (OSS)  928  may be part of network  900  to provide management functions for network  900  and to provide interfaces between functional entities of network  900 . Network  900  of  FIG. 9  is merely one type of wireless network showing a certain number of the components of network  900 ; however, the scope of the claimed subject matter is not limited in these respects. 
       FIG. 10  shows an exemplary block diagram of the overall architecture of a 3GPP LTE network  1000  that includes one or more devices that are capable of implementing methods to identify victims and aggressors according to the subject matter disclosed herein.  FIG. 10  also generally shows exemplary network elements and exemplary standardized interfaces. At a high level, network  1000  comprises a core network (CN)  1001  (also referred to as an evolved Packet System (EPC)), and an air-interface access network E UTRAN  1002 . CN  1001  is responsible for the overall control of the various User Equipment (UE) connected to the network and establishment of the bearers. CN  1001  may include functional entities, such as a home agent and/or an ANDSF server or entity, although not explicitly depicted. E UTRAN  1002  is responsible for all radio-related functions. 
     The main exemplary logical nodes of CN  1001  include, but are not limited to, a Serving GPRS Support Node  1003 , the Mobility Management Entity  1004 , a Home Subscriber Server (HSS)  1005 , a Serving Gate (SGW)  1006 , a PDN Gateway  1007  and a Policy and Charging Rules Function (PCRF) Manager  1008 . The functionality of each of the network elements of CN  1001  is well known and is not described herein. Each of the network elements of CN  1001  are interconnected by well-known exemplary standardized interfaces, some of which are indicated in  FIG. 10 , such as interfaces S3, S4, S5, etc., although not described herein. 
     While CN  1001  includes many logical nodes, the E UTRAN access network  1002  is formed by at least one node, such as evolved NodeB (base station (BS), eNB or eNodeB)  1010 , which connects to one or more User Equipment (UE)  1011 , of which only one is depicted in  FIG. 10 . UE  1011  is also referred to herein as a wireless device (WD) and/or a subscriber station (SS), and can include an M2M-type device. In one EXAMPLE, UE  1011  is capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. In one exemplary configuration, a single cell of an E UTRAN access network  1002  provides one substantially localized geographical transmission point (having multiple antenna devices) that provides access to one or more UEs. In another exemplary configuration, a single cell of an E UTRAN access network  1002  provides multiple geographically substantially isolated transmission points (each having one or more antenna devices) with each transmission point providing access to one or more UEs simultaneously and with the signaling bits defined for the one cell so that all UEs share the same spatial signaling dimensioning. For normal user traffic (as opposed to broadcast), there is no centralized controller in E-UTRAN; hence the E-UTRAN architecture is said to be flat. The eNBs are normally interconnected with each other by an interface known as “X2” and to the EPC by an Si interface. More specifically, an eNB is connected to MME  1004  by an Si MME interface and to SGW  1006  by an Si U interface. The protocols that run between the eNBs and the UEs are generally referred to as the “AS protocols.” Details of the various interfaces are well known and not described herein. 
     The eNB  1010  hosts the PHYsical (PHY), Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Control Protocol (PDCP) layers, which are not shown in  FIG. 10 , and which include the functionality of user-plane header-compression and encryption. The eNB  1010  also provides Radio Resource Control (RRC) functionality corresponding to the control plane, and performs many functions including radio resource management, admission control, scheduling, enforcement of negotiated Up Link (UL) QoS, cell information broadcast, ciphering/deciphering of user and control plane data, and compression/decompression of DL/UL user plane packet headers. 
     The RRC layer in eNB  1010  covers all functions related to the radio bearers, such as radio bearer control, radio admission control, radio mobility control, scheduling and dynamic allocation of resources to UEs in both uplink and downlink, header compression for efficient use of the radio interface, security of all data sent over the radio interface, and connectivity to the EPC. The RRC layer makes handover decisions based on neighbor cell measurements sent by UE  1011 , generates pages for UEs  1011  over the air, broadcasts system information, controls UE measurement reporting, such as the periodicity of Channel Quality Information (CQI) reports, and allocates cell-level temporary identifiers to active UEs  1011 . The RRC layer also executes transfer of UE context from a source eNB to a target eNB during handover, and provides integrity protection for RRC messages. Additionally, the RRC layer is responsible for the setting up and maintenance of radio bearers. 
       FIGS. 11 and 12  respectively depict exemplary radio interface protocol structures between a UE and an eNodeB that are based on a 3GPP-type radio access network standard and that is capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. More specifically,  FIG. 11  depicts individual layers of a radio protocol control plane and  FIG. 12  depicts individual layers of a radio protocol user plane. The protocol layers of  FIGS. 11 and 12  can be classified into an L1 layer (first layer), an L2 layer (second layer) and an L3 layer (third layer) on the basis of the lower three layers of the OSI reference model widely known in communication systems. 
     The physical (PHY) layer, which is the first layer (L1), provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a Medium Access Control (MAC) layer, which is located above the physical layer, through a transport channel. Data is transferred between the MAC layer and the PHY layer through the transport channel. A transport channel is classified into a dedicated transport channel and a common transport channel according to whether or not the channel is shared. Data transfer between different physical layers, specifically between the respective physical layers of a transmitter and a receiver is performed through the physical channel. 
     A variety of layers exist in the second layer (L2 layer). For example, the MAC layer maps various logical channels to various transport channels, and performs logical-channel multiplexing for mapping various logical channels to one transport channel. The MAC layer is connected to the Radio Link Control (RLC) layer serving as an upper layer through a logical channel. The logical channel can be classified into a control channel for transmitting information of a control plane and a traffic channel for transmitting information of a user plane according to categories of transmission information. 
     The RLC layer of the second layer (L2) performs segmentation and concatenation on data received from an upper layer, and adjusts the size of data to be suitable for a lower layer transmitting data to a radio interval. In order to guarantee various Qualities of Service (QoSs) requested by respective radio bearers (RBs), three operation modes, i.e., a Transparent Mode (TM), an Unacknowledged Mode (UM), and an Acknowledged Mode (AM), are provided. Specifically, an AM RLC performs a retransmission function using an Automatic Repeat and Request (ARQ) function so as to implement reliable data transmission. 
     A Packet Data Convergence Protocol (PDCP) layer of the second layer (L2) performs a header compression function to reduce the size of an IP packet header having relatively large and unnecessary control information in order to efficiently transmit IP packets, such as IPv4 or IPv6 packets, in a radio interval with a narrow bandwidth. As a result, only information required for a header part of data can be transmitted, so that transmission efficiency of the radio interval can be increased. In addition, in an LTE-based system, the PDCP layer performs a security function that includes a ciphering function for preventing a third party from eavesdropping on data and an integrity protection function for preventing a third party from handling data. 
     A Radio Resource Control (RRC) layer located at the top of the third layer (L3) is defined only in the control plane and is responsible for control of logical, transport, and physical channels in association with configuration, re-configuration and release of Radio Bearers (RBs). The RB is a logical path that the first and second layers (L1 and L2) provide for data communication between the UE and the UTRAN. Generally, Radio Bearer (RB) configuration means that a radio protocol layer needed for providing a specific service, and channel characteristics are defined and their detailed parameters and operation methods are configured. The Radio Bearer (RB) is classified into a Signaling RB (SRB) and a Data RB (DRB). The SRB is used as a transmission passage of RRC messages in the C plane, and the DRB is used as a transmission passage of user data in the U plane. 
     A downlink transport channel for transmitting data from the network to the UE may be classified into a Broadcast Channel (BCH) for transmitting system information and a downlink Shared Channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH and may also be transmitted through a downlink multicast channel (MCH). Uplink transport channels for transmission of data from the UE to the network include a Random Access Channel (RACH) for transmission of initial control messages and an uplink SCH for transmission of user traffic or control messages. 
     Downlink physical channels for transmitting information transferred to a downlink transport channel to a radio interval between the UE and the network are classified into a Physical Broadcast Channel (PBCH) for transmitting BCH information, a Physical Multicast Channel (PMCH) for transmitting MCH information, a Physical Downlink Shared Channel (PDSCH) for transmitting downlink SCH information, and a Physical Downlink Control Channel (PDCCH) (also called a DL L1/L2 control channel) for transmitting control information, such as DL/UL Scheduling Grant information, received from first and second layers (L1 and L2). In the meantime, uplink physical channels for transmitting information transferred to an uplink transport channel to a radio interval between the UE and the network are classified into a Physical Uplink Shared Channel (PUSCH) for transmitting uplink SCH information, a Physical Random Access Channel for transmitting RACH information, and a Physical Uplink Control Channel (PUCCH) for transmitting control information, such as Hybrid Automatic Repeat Request (HARQ) ACK or NACK Scheduling Request (SR) and Channel Quality Indicator (CQI) report information, received from first and second layers (L1 and L2). 
       FIG. 13  depicts an exemplary functional block diagram of an information-handling system  1300  that is capable of implementing methods to identify victims and aggressors according to the subject matter disclosed herein. Information handling system  1300  of  FIG. 13  may tangibly embody one or more of any of the exemplary devices, exemplary network elements and/or functional entities of the network as shown in and described herein. In one example, information-handling system  1300  may represent eNB  1010 , and/or UE  1011 , with greater or fewer components depending on the hardware specifications of the particular device or network element. In another example, information-handling system may provide M2M-type device capability. Although information-handling system  1300  represents one example of several types of computing platforms, information-handling system  1300  may include more or fewer elements and/or different arrangements of elements than shown in  FIG. 11 , and the scope of the claimed subject matter is not limited in these respects. 
     In one or more examples, information-handling system  1300  may comprise one or more applications processor  1310  and a baseband processor  1312 . Applications processor  1310  may be utilized as a general purpose processor to run applications and the various subsystems for information handling system  1300 , and to capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. Applications processor  1310  may include a single core or alternatively may include multiple processing cores wherein one or more of the cores may comprise a digital signal processor or digital signal processing core. Furthermore, applications processor  1310  may include a graphics processor or coprocessor disposed on the same chip, or alternatively a graphics processor coupled to applications processor  1310  may comprise a separate, discrete graphics chip. Applications processor  1310  may include on-board memory, such as cache memory, and further may be coupled to external memory devices such as synchronous dynamic random access memory (SDRAM)  1314  for storing and/or executing applications, such as capable of providing an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. During operation, and NAND flash  1316  for storing applications and/or data even when information handling system  1300  is powered off. 
     In one example, a list of candidate nodes may be stored in SDRAM  1314  and/or NAND flash  1316 . Further, applications processor  1310  may execute computer-readable instructions stored in SDRAM  1314  and/or NAND flash  1316  that result in an uplink-transmit-power control technique that reduces interference experienced at other wireless devices according to the subject matter disclosed herein. 
     In one example, baseband processor  1312  may control the broadband radio functions for information-handling system  1300 . Baseband processor  1312  may store code for controlling such broadband radio functions in a NOR flash  1318 . Baseband processor  1312  controls a wireless wide area network (WWAN) transceiver  1320  which is used for modulating and/or demodulating broadband network signals, for example, for communicating via a 3GPP LTE network or the like as discussed herein with respect to  FIG. 13 . The WWAN transceiver  1320  couples to one or more power amplifiers  1322  that are respectively coupled to one or more antennas  1324  for sending and receiving radio-frequency signals via the WWAN broadband network. The baseband processor  1312  also may control a wireless local area network (WLAN) transceiver  1326  coupled to one or more suitable antennas  1328  and that may be capable of communicating via a Bluetooth-based standard, an IEEE 802.11-based standard, an IEEE 802.16-based standard, an IEEE 802.18-based wireless network standard, a 3GPP-based protocol wireless network, a Third Generation Partnership Project Long Term Evolution (3GPP LTE) based wireless network standard, a 3GPP2 Air Interface Evolution (3GPP2 AIE) based wireless network standard, a 3GPP-LTE-Advanced-based wireless network, a UMTS-based protocol wireless network, a CDMA2000-based protocol wireless network, a GSM-based protocol wireless network, a cellular-digital-packet-data-based (CDPD-based) protocol wireless network, a Mobitex-based protocol wireless network, a Near-Field-Communications-based (NFC-based) link, a WiGig-based network, a ZigBee-based network, or the like. It should be noted that these are merely exemplary implementations for applications processor  1310  and baseband processor  1312 , and the scope of the claimed subject matter is not limited in these respects. For example, any one or more of SDRAM  1314 , NAND flash  1316  and/or NOR flash  1318  may comprise other types of memory technology, such as magnetic-based memory, chalcogenide-based memory, phase-change-based memory, optical-based memory, or ovonic-based memory, and the scope of the claimed subject matter is not limited in this respect. 
     In one or more embodiments, applications processor  1310  may drive a display  1330  for displaying various information or data, and may further receive touch input from a user via a touch screen  1332 , for example, via a finger or a stylus. In one exemplary embodiment, screen  1332  display a menu and/or options to a user that are selectable via a finger and/or a stylus for entering information into information-handling system  1300 . 
     An ambient light sensor  1334  may be utilized to detect an amount of ambient light in which information-handling system  1300  is operating, for example, to control a brightness or contrast value for display  1330  as a function of the intensity of ambient light detected by ambient light sensor  1334 . One or more cameras  1336  may be utilized to capture images that are processed by applications processor  1310  and/or at least temporarily stored in NAND flash  1316 . Furthermore, applications processor may be coupled to a gyroscope  1338 , accelerometer  1340 , magnetometer  1342 , audio coder/decoder (CODEC)  1344 , and/or global positioning system (GPS) controller  1346  coupled to an appropriate GPS antenna  1348 , for detection of various environmental properties including location, movement, and/or orientation of information-handling system  1300 . Alternatively, controller  1346  may comprise a Global Navigation Satellite System (GNSS) controller. Audio CODEC  1344  may be coupled to one or more audio ports  1350  to provide microphone input and speaker outputs either via internal devices and/or via external devices coupled to information-handling system via the audio ports  1350 , for example, via a headphone and microphone jack. In addition, applications processor  1310  may couple to one or more input/output (I/O) transceivers  1352  to couple to one or more I/O ports  1354  such as a universal serial bus (USB) port, a high-definition multimedia interface (HDMI) port, a serial port, and so on. Furthermore, one or more of the I/O transceivers  1352  may couple to one or more memory slots  1356  for optional removable memory, such as secure digital (SD) card or a subscriber identity module (SIM) card, although the scope of the claimed subject matter is not limited in these respects. 
       FIG. 14  depicts an isometric view of an exemplary embodiment of the information-handling system of  FIG. 13  that optionally may include a touch screen in accordance with one or more embodiments disclosed herein.  FIG. 14  shows an example implementation of information-handling system  1300  of  FIG. 13  tangibly embodied as a cellular telephone, smartphone, smart-type device, or tablet-type device or the like, that is capable of implementing methods to identify victims and aggressors according to the subject matter disclosed herein. In one or more embodiments, the information-handling system  1300  may comprise any one of the infrastructure nodes, wireless device  400 , subscriber station  916 , CPE  922 , mobile station UE  1311  of  FIG. 13 , and/or an M2M-type device, although the scope of the claimed subject matter is not limited in this respect. The information-handling system  1300  may comprise a housing  1410  having a display  1330  that may include a touch screen  1332  for receiving tactile input control and commands via a finger  1416  of a user and/or a via stylus  1418  to control one or more applications processors  1310 . The housing  1410  may house one or more components of information-handling system  1300 , for example, one or more applications processors  1310 , one or more of SDRAM  1314 , NAND flash  1316 , NOR flash  1318 , baseband processor  1312 , and/or WWAN transceiver  1320 . The information-handling system  1300  further may optionally include a physical actuator area  1420  which may comprise a keyboard or buttons for controlling information-handling system  1300  via one or more buttons or switches. The information-handling system  1300  may also include a memory port or slot  1356  for receiving non-volatile memory, such as flash memory, for example, in the form of a secure digital (SD) card or a subscriber identity module (SIM) card. Optionally, the information-handling system  1300  may further include one or more speakers and/or microphones  1424  and a connection port  1354  for connecting the information-handling system  1300  to another electronic device, dock, display, battery charger, and so on. Additionally, information-handling system  1300  may include a headphone or speaker jack  1428  and one or more cameras  1336  on one or more sides of the housing  1410 . It should be noted that the information-handling system  1300  of  FIGS. 13 and 14  may include more or fewer elements than shown, in various arrangements, and the scope of the claimed subject matter is not limited in this respect. 
     As used herein, the term “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, circuitry may include logic, at least partially operable in hardware. 
     Embodiments described herein may be implemented into a system using any suitably configured hardware and/or software.  FIG. 15  illustrates, for one embodiment, example components of a User Equipment (UE) device  1500 . In some embodiments, the UE device  1500  may include application circuitry  1502 , baseband circuitry  1504 , Radio Frequency (RF) circuitry  1506 , front-end module (FEM) circuitry  1508  and one or more antennas  1510 , coupled together at least as shown. 
     The application circuitry  1502  may include one or more application processors. For example, the application circuitry  1502  may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor(s) may include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc.). The processors may be coupled with and/or may include memory/storage and may be configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems to run on the system. 
     The baseband circuitry  1504  may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The baseband circuitry  1504  may include one or more baseband processors and/or control logic to process baseband signals received from a receive signal path of the RF circuitry  1506  and to generate baseband signals for a transmit signal path of the RF circuitry  1506 . Baseband processing circuitry  1504  may interface with the application circuitry  1502  for generation and processing of the baseband signals and for controlling operations of the RF circuitry  1506 . For example, in some embodiments, the baseband circuitry  1504  may include a second generation (2G) baseband processor  1504   a , third generation (3G) baseband processor  1504   b , fourth generation (4G) baseband processor  1504   c , and/or other baseband processor(s)  1504   d  for other existing generations, generations in development or to be developed in the future (e.g., fifth generation (5G), 6G, etc.). The baseband circuitry  1504  (e.g., one or more of baseband processors  1504   a - d ) may handle various radio control functions that enable communication with one or more radio networks via the RF circuitry  1506 . The radio control functions may include, but are not limited to, signal modulation/demodulation, encoding/decoding, radio frequency shifting, etc. In some embodiments, modulation/demodulation circuitry of the baseband circuitry  1504  may include Fast-Fourier Transform (FFT), precoding, and/or constellation mapping/demapping functionality. In some embodiments, encoding/decoding circuitry of the baseband circuitry  1504  may include convolution, tail-biting convolution, turbo, Viterbi, and/or Low Density Parity Check (LDPC) encoder/decoder functionality. Embodiments of modulation/demodulation and encoder/decoder functionality are not limited to these examples and may include other suitable functionality in other embodiments. 
     In some embodiments, the baseband circuitry  1504  may include elements of a protocol stack such as, for example, elements of an evolved universal terrestrial radio access network (EUTRAN) protocol including, for example, physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), and/or radio resource control (RRC) elements. A central processing unit (CPU)  1504   e  of the baseband circuitry  1504  may be configured to run elements of the protocol stack for signaling of the PHY, MAC, RLC, PDCP and/or RRC layers. In some embodiments, the baseband circuitry may include one or more audio digital signal processor(s) (DSP)  1504   f  The audio DSP(s)  1504   f  may be include elements for compression/decompression and echo cancellation and may include other suitable processing elements in other embodiments. Components of the baseband circuitry may be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some embodiments. In some embodiments, some or all of the constituent components of the baseband circuitry  1504  and the application circuitry  1502  may be implemented together such as, for example, on a system on a chip (SOC). 
     In some embodiments, the baseband circuitry  1504  may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry  1504  may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN). Embodiments in which the baseband circuitry  1504  is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry. 
     RF circuitry  1506  may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry  1506  may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. RF circuitry  1506  may include a receive signal path which may include circuitry to down-convert RF signals received from the FEM circuitry  1508  and provide baseband signals to the baseband circuitry  1504 . RF circuitry  1506  may also include a transmit signal path which may include circuitry to up-convert baseband signals provided by the baseband circuitry  1504  and provide RF output signals to the FEM circuitry  1508  for transmission. 
     In some embodiments, the RF circuitry  1506  may include a receive signal path and a transmit signal path. The receive signal path of the RF circuitry  1506  may include mixer circuitry  1506   a , amplifier circuitry  1506   b  and filter circuitry  1506   c . The transmit signal path of the RF circuitry  1506  may include filter circuitry  1506   c  and mixer circuitry  1506   a . RF circuitry  1506  may also include synthesizer circuitry  1506   d  for synthesizing a frequency for use by the mixer circuitry  1506   a  of the receive signal path and the transmit signal path. In some embodiments, the mixer circuitry  1506   a  of the receive signal path may be configured to down-convert RF signals received from the FEM circuitry  1508  based on the synthesized frequency provided by synthesizer circuitry  1506   d . The amplifier circuitry  1506   b  may be configured to amplify the down-converted signals and the filter circuitry  1506   c  may be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals. Output baseband signals may be provided to the baseband circuitry  1504  for further processing. In some embodiments, the output baseband signals may be zero-frequency baseband signals, although this is not a requirement. In some embodiments, mixer circuitry  1506   a  of the receive signal path may comprise passive mixers, although the scope of the embodiments is not limited in this respect. 
     In some embodiments, the mixer circuitry  1506   a  of the transmit signal path may be configured to up-convert input baseband signals based on the synthesized frequency provided by the synthesizer circuitry  1506   d  to generate RF output signals for the FEM circuitry  1508 . The baseband signals may be provided by the baseband circuitry  1504  and may be filtered by filter circuitry  1506   c . The filter circuitry  1506   c  may include a low-pass filter (LPF), although the scope of the embodiments is not limited in this respect. 
     In some embodiments, the mixer circuitry  1506   a  of the receive signal path and the mixer circuitry  1506   a  of the transmit signal path may include two or more mixers and may be arranged for quadrature downconversion and/or upconversion respectively. In some embodiments, the mixer circuitry  1506   a  of the receive signal path and the mixer circuitry  1506   a  of the transmit signal path may include two or more mixers and may be arranged for image rejection (e.g., Hartley image rejection). In some embodiments, the mixer circuitry  1506   a  of the receive signal path and the mixer circuitry  1506   a  may be arranged for direct downconversion and/or direct upconversion, respectively. In some embodiments, the mixer circuitry  1506   a  of the receive signal path and the mixer circuitry  1506   a  of the transmit signal path may be configured for super-heterodyne operation. 
     In some embodiments, the output baseband signals and the input baseband signals may be analog baseband signals, although the scope of the embodiments is not limited in this respect. In some alternate embodiments, the output baseband signals and the input baseband signals may be digital baseband signals. In these alternate embodiments, the RF circuitry  1506  may include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry and the baseband circuitry  1504  may include a digital baseband interface to communicate with the RF circuitry  1506 . 
     In some dual-mode embodiments, a separate radio IC circuitry may be provided for processing signals for each spectrum, although the scope of the embodiments is not limited in this respect. 
     In some embodiments, the synthesizer circuitry  1506   d  may be a fractional-N synthesizer or a fractional N/N+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers may be suitable. For example, synthesizer circuitry  1506   d  may be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider. 
     The synthesizer circuitry  1506   d  may be configured to synthesize an output frequency for use by the mixer circuitry  1506   a  of the RF circuitry  1506  based on a frequency input and a divider control input. In some embodiments, the synthesizer circuitry  1506   d  may be a fractional N/N+1 synthesizer. 
     In some embodiments, frequency input may be provided by a voltage controlled oscillator (VCO), although that is not a requirement. Divider control input may be provided by either the baseband circuitry  1504  or the applications processor  1502  depending on the desired output frequency. In some embodiments, a divider control input (e.g., N) may be determined from a look-up table based on a channel indicated by the applications processor  1502 . 
     Synthesizer circuitry  1506   d  of the RF circuitry  1506  may include a divider, a delay-locked loop (DLL), a multiplexer and a phase accumulator. In some embodiments, the divider may be a dual modulus divider (DMD) and the phase accumulator may be a digital phase accumulator (DPA). In some embodiments, the DMD may be configured to divide the input signal by either N or N+1 (e.g., based on a carry out) to provide a fractional division ratio. In some example embodiments, the DLL may include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop. In these embodiments, the delay elements may be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO cycle. 
     In some embodiments, synthesizer circuitry  1506   d  may be configured to generate a carrier frequency as the output frequency, while in other embodiments, the output frequency may be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other. In some embodiments, the output frequency may be a LO frequency (fLO). In some embodiments, the RF circuitry  1506  may include an IQ/polar converter. 
     FEM circuitry  1508  may include a receive signal path which may include circuitry configured to operate on RF signals received from one or more antennas  1510 , amplify the received signals and provide the amplified versions of the received signals to the RF circuitry  1506  for further processing. FEM circuitry  1508  may also include a transmit signal path which may include circuitry configured to amplify signals for transmission provided by the RF circuitry  1506  for transmission by one or more of the one or more antennas  1510 . 
     In some embodiments, the FEM circuitry  1508  may include a TX/RX switch to switch between transmit mode and receive mode operation. The FEM circuitry may include a receive signal path and a transmit signal path. The receive signal path of the FEM circuitry may include a low-noise amplifier (LNA) to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to the RF circuitry  1506 ). The transmit signal path of the FEM circuitry  1508  may include a power amplifier (PA) to amplify input RF signals (e.g., provided by RF circuitry  1506 ), and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of the one or more antennas  1510 . 
     In some embodiments, the UE device  1500  may include additional elements such as, for example, memory/storage, display, camera, sensor, and/or input/output (I/O) interface. 
     The following pertains to further examples. 
     Example 1 is an apparatus of an e-NodeB (eNB) capable to establish a communication connection with a user equipment (UE) in a communication network, the eNB comprising processing circuitry to transmit a downlink (DL) beamforming training reference signal (BF-TRS) to a user equipment (UE) using transmit beamforming weights that are the same. 
     In Example 2, the subject matter of Example 1 can optionally include an arrangement in which the DL BF-TRS is transmitted in one subframe or in a plurality of subframes. 
     In Example 3, the subject matter of any one of Examples 1-2 can optionally include an arrangement in which the DL BF-TRS is transmitted in X symbols, where X is predefined or configured by higher layers via a 5G master information block (xMIB), a 5G system information block (xSIB), or a UE specific RRC signaling. 
     In Example 4, the subject matter of any one of Examples 1-3 can optionally include an arrangement in which an interleaved FDMA (IFDMA) signal structure is used to generate the DL BF-TRS. 
     In Example 5, the subject matter of any one of Examples 1-4 can optionally include an arrangement in which the communication system has a bandwidth which is divided into a number (L) sub-bands, and wherein each sub-band is used for one Tx beamformed BF-TRS transmission for a single UE, the number (L) of sub-bands is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB, and a resource allocation configuration for the UE is signaled in dedicated RRC signaling or indicated in DCI format for DL assignment. 
     In Example 6, the subject matter of any one of Examples 1-5 can optionally include an arrangement in which the DL BF-TRS is transmitted in a physical resource block (PRB) which is also used for the transmission of a physical downlink shared channel (xPDSCH) in the event that the BF-TRS is triggered by an xPDCCH. 
     In Example 7, the subject matter of any one of Examples 1-6 can optionally include an arrangement in which the BF-TRS patterns are transmitted using at least one of a distributed transmission procedure or a localized transmission procedure, a number (K) subcarriers are used to define a gap between adjacent BF-TRS symbols and K is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
     In Example 8, the subject matter of any one of Examples 1-7 can optionally include an arrangement in which the DL BF-TRS sequence is defined by: 
     
       
         
           
             
               
                 
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     where can be a number of a slot or a subframe within a radio frame and is an OFDM symbol number within the slot or the subframe. 
     In Example 9, the subject matter of any one of Examples 1-8 can optionally include an arrangement in which the DL BF-TRS sequence is generated in a pseudo-random sequence generator initialized as a function of at least one of, a physical cell ID, a virtual physical cell ID, an indication of a normal cyclic prefix (CP) and extended CP. 
     In Example 10, the subject matter of any one of Examples 1-9 can optionally include an arrangement in which the DL BF-TRS is triggered in an aperiodic manner by a physical downlink control channel (xPDCCH). 
     In Example 11, the subject matter of any one of Examples 1-10 can optionally include an arrangement in which a predetermined subframe gap is inserted between the xPDCCH and the transmission of DL and/or UL BF-TRS, and the gap is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
     In Example 12, the subject matter of any one of Examples 1-11 can optionally include an arrangement in which the DL BF-TRS is transmitted a number (K) subframes after ACK or NACK feedback from a UE, and the number K is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB 
     In Example 13, the subject matter of any one of Examples 1-12 can optionally include an arrangement in which the DL BF-TRS is enabled for a first Hybrid automatic repeat request (HARQ) process and is disabled for a second HARQ process and the first HARQ process and the second HARQ process is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
     In Example 14, the subject matter of any one of Examples 1-13 can optionally include an arrangement in which the DL BF-TRS is transmitted in a periodic manner in one or more subframes which are defined as downlink in a time-division duplex (TDD) system satisfying the condition: 
     
       
         
           
             
               
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     where n f  and n s  are radio frame number and slot number; N OFFSET, TRS  and TRS PERIODITICTY  are the subframe offset and periodicity of the BF-TRS transmission. 
     In Example 16, the subject matter of any one of Examples 1-15 can optionally include an arrangement in which N OFFSET, TRS  and TRS PERIODICITY  are defined by a parameter I TRS , which is predefined or configured by one or more higher protocol layers via an extended management information block (xMIB), an extended system in formation block (xSIB) or UE-specific dedicated radio resource control (RRC) signaling from a serving eNB. 
     Example 17 is an apparatus of a user equipment (UE) capable to establish a communication connection with an eNB, the UE comprising processing circuitry to transmit an uplink (UL) beamforming training reference signal (BF-TRS) to an eNB using transmit beamforming weights that are different. 
     In Example 18, the subject matter of Example 17 can optionally include an arrangement in which the UL BF-TRS is transmitted in a number (X) symbols within one subframe or transmitted in one or a plurality of subframes. 
     In Example 19, the subject matter of any one of Examples 1-18 can optionally include an arrangement in which the UL BF-TRS is transmitted in a frequency division multiplexing (FDM) manner for multiple UEs. 
     In Example 20, the subject matter of any one of Examples 1-19 can optionally include an arrangement in which the UE performs a transmit beamforming sweep on a number (N) BF-TRS repetition blocks based on an IFDMA structure. 
     In Example 21, the subject matter of any one of Examples 1-19 can optionally include an arrangement in which the UL BF-TRS is transmitted in a physical resource block (PRB) which is also used for the transmission of a physical uplink control channel (xPUCCH) for the UE. 
     In Example 22, the subject matter of any one of Examples 1-21 can optionally include an arrangement in which the UL BF-TRS sequence is defined by: 
     
       
         
           
             
               
                 
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     where n s  can be a number of a slot or a subframe within a radio frame and l is an OFDM symbol number within the slot or the subframe. 
     In Example 23, the subject matter of any one of Examples 1-22 can optionally include an arrangement in which the UL BF-TRS sequence is generated in a pseudo-random sequence generator initialized as a function of at least one of, a physical cell ID, a virtual physical cell ID, an indication of a normal cyclic prefix (CP) and extended CP, and the pseudo-random sequence generator may be defined as a function of a Cell Radio Network Temporary Identifier (C-RNTI) and/or a Demodulation reference symbol (DM-RS) index used for the transmission of a physical uplink shared control channel (xPUSCH) 
     In various examples, the operations discussed herein may be implemented as hardware (e.g., circuitry), software, firmware, microcode, or combinations thereof, which may be provided as a computer program product, e.g., including a tangible (e.g., non-transitory) machine-readable or computer-readable medium having stored thereon instructions (or software procedures) used to program a computer to perform a process discussed herein. Also, the term “logic” may include, by way of example, software, hardware, or combinations of software and hardware. The machine-readable medium may include a storage device such as those discussed herein. 
     Reference in the specification to “one example” or “an example” means that a particular feature, structure, or characteristic described in connection with the example may be included in at least an implementation. The appearances of the phrase “in one example” in various places in the specification may or may not be all referring to the same example. 
     Also, in the description and claims, the terms “coupled” and “connected,” along with their derivatives, may be used. In some examples, “connected” may be used to indicate that two or more elements are in direct physical or electrical contact with each other. “Coupled” may mean that two or more elements are in direct physical or electrical contact. However, “coupled” may also mean that two or more elements may not be in direct contact with each other, but may still cooperate or interact with each other. 
     Thus, although examples have been described in language specific to structural features and/or methodological acts, it is to be understood that claimed subject matter may not be limited to the specific features or acts described. Rather, the specific features and acts are disclosed as sample forms of implementing the claimed subject matter.

Metadata:
Filing Date: 20151211
Publication Date: 20200526
Grant Date: 20200526
Priority Date: 20150818
Inventors: XIONG, GANG
ZHANG, YUSHU
ZHU, YUAN
BENDLIN, RALF
FWU, JONG-KAE
HAN, SEUNGHEE
Assignee: APPLE INC
CPC Classifications: [{"code": "H04W88/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L27/2607", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/0092", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/0092", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0617", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04W76/27", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L1/1812", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0695", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/0048", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W72/0446", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W72/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W76/27", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0695", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0617", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04L5/0092", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L1/1812", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/0048", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W88/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/005", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L27/2607", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W72/0446", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W72/23", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04L5/005", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04L5/005", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0695", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 58051199