Source: https://patents.google.com/patent/US8260356B2/en
Timestamp: 2020-06-03 05:52:23
Document Index: 140804460

Matched Legal Cases: ['Application No. 61', 'Application No. 61', '§119', 'Application No. 61', 'Application No. 61', 'Application No. 61', '§119', 'Application No. 61', 'Application No. 61', 'Application No. 61', '§119', 'Application No. 61', 'art 16']

US8260356B2 - Method and system for indicating method used to scramble dedicated reference signals - Google Patents
Method and system for indicating method used to scramble dedicated reference signals Download PDF
US8260356B2
US8260356B2 US12/797,418 US79741810A US8260356B2 US 8260356 B2 US8260356 B2 US 8260356B2 US 79741810 A US79741810 A US 79741810A US 8260356 B2 US8260356 B2 US 8260356B2
US12/797,418
US20100323709A1 (en
2010-06-09 Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
2010-06-09 Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIU, LINGJIA, ZHANG, JIANZHONG, HAN, JIN-KYU, NAM, YOUNG-HAN
2010-12-23 Publication of US20100323709A1 publication Critical patent/US20100323709A1/en
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The present application is related to U.S. Provisional Patent Application No. 61/268,950, filed Jun. 18, 2009, entitled “SIGNALING FOR MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS”. Provisional Patent Application No. 61/268,950 is assigned to the assignee of the present application and is hereby incorporated by reference into the present application as if fully set forth herein. The present application hereby claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 61/268,950.
The present application also is related to U.S. Provisional Patent Application No. 61/269,886, filed Jun. 30, 2009, entitled “SIGNALING METHODS FOR MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS”. Provisional Patent Application No. 61/269,886 is assigned to the assignee of the present application and is hereby incorporated by reference into the present application as if fully set forth herein. The present application hereby claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 61/269,886.
The present application further is related to U.S. Provisional Patent Application No. 61/273,646, filed Aug. 6, 2009, entitled “METHODS OF MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS”. Provisional Patent Application No. 61/273,646 is assigned to the assignee of the present application and is hereby incorporated by reference into the present application as if fully set forth herein. The present application hereby claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 61/273,646.
FIG. 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmitter according to one embodiment of the disclosure;
FIG. 6 illustrates reference signal patterns according to an embodiment of this disclosure;
FIG. 7 illustrates data sections and reference signal sections of a reference pattern from the perspective of two user equipments according to an embodiment of this disclosure;
FIG. 8 illustrates data sections and reference signal sections of a reference pattern from the perspective of two user equipments according to another embodiment of this disclosure;
FIG. 9 illustrates a system for generating and mapping reference signal sequences according to an embodiment of this disclosure;
FIG. 10A illustrates a table summarizing downlink control information (DCI) formats used for downlink (DL) grants according to an embodiment of this disclosure;
FIG. 10B illustrates a method of operating a base station according to an embodiment of this disclosure;
FIG. 10C illustrates a method of operating a subscriber station according to an embodiment of this disclosure;
FIG. 11 illustrates a table showing a mapping of enabled codewords to a stream index and a dedicated reference signal (DRS) index according to an embodiment of this disclosure;
FIG. 12 illustrates a table showing a mapping of a new data indicator (NDI) bit of a disabled codeword to a stream index and a dedicated reference signal (DRS) index according to an embodiment of this disclosure;
FIG. 13 illustrates a method of operating a base station or eNodeB according to another embodiment of this disclosure;
FIG. 14 illustrates a method of operating a subscriber station according to another embodiment of this disclosure;
FIG. 15 illustrates a table depicting two states of a downlink (DL) grant according to an embodiment of this disclosure;
FIG. 16 illustrates a table depicting two states of a downlink (DL) grant using a one-bit field according to an embodiment of this disclosure;
FIG. 17 illustrates a table depicting use of the number of enabled transport blocks (TBs) to indicate the choice of cell-specific scrambling or UE-specific scrambling according to an embodiment of this disclosure;
FIG. 18 illustrates a table depicting use of an existing bit in a particular downlink (DL) grant to indicate the choice of cell-specific scrambling or UE-specific scrambling according to an embodiment of this disclosure;
FIG. 19 illustrates a method of operating a base station or eNodeB according to yet another embodiment of this disclosure;
FIG. 20 illustrates a method of operating a subscriber station according to yet another embodiment of this disclosure;
FIG. 21 illustrates a search space composed of a set of consecutive the control channel element (CCEs) according to an embodiment of this disclosure;
FIG. 22 illustrates a method of operating an eNodeB or base station according to a first embodiment of this disclosure;
FIG. 23 illustrates a method of operating a UE or subscriber station according to a first embodiment of this disclosure;
FIG. 24 illustrates a method of operating an eNodeB or base station according to a second embodiment of this disclosure;
FIG. 25 illustrates a method of operating a UE or subscriber station according to a second embodiment of this disclosure;
FIG. 26 illustrates a linkage between a location of a control channel element (CCE) aggregation and a stream (or DRS) ID according to an embodiment of this disclosure;
FIG. 27 illustrates a method of operating an eNodeB or base station according to a third embodiment of this disclosure;
FIG. 28 illustrates a method of operating a UE or subscriber station according to a third embodiment of this disclosure;
FIG. 29 illustrates downlink (DL) formats according to embodiments of this disclosure;
FIG. 30 illustrates a method of operating an eNodeB or base station according to a fourth embodiment of this disclosure;
FIG. 31 illustrates a method of operating a UE or subscriber station according to a fourth embodiment of this disclosure;
FIG. 32 illustrates a table used to indicate a number of streams according to an embodiment of this disclosure;
FIG. 33 illustrates the use of a DRS set indicator flag to indicate a DRS RE set index according to an embodiment of this disclosure;
FIG. 34 illustrates a DCI format according to an embodiment of this disclosure;
FIG. 35 illustrates a DCI format according to another embodiment of this disclosure;
FIG. 36 illustrates a table used to map assigned DRSs or stream indices according to an embodiment of this disclosure;
FIG. 37 illustrates a use of bit values in the DRS set indicator flag and DRS set number flag according to an embodiment of this disclosure;
FIG. 38 illustrates a DCI format according to a further embodiment of this disclosure;
FIG. 39 illustrates a DCI format according to a yet another embodiment of this disclosure;
FIG. 40 illustrates a DCI format according to a yet further embodiment of this disclosure; and
FIG. 41 illustrates a table used to map assigned DRSs or stream indices according to another embodiment of this disclosure.
FIGS. 1 through 41, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.
In this embodiment, base station 420 performs simultaneous beamforming through a plurality of transmitters to each mobile station. For instance, base station 420 transmits data to mobile station 402 through a beamformed signal 410, data to mobile station 404 through a beamformed signal 412, data to mobile station 406 through a beamformed signal 414, and data to mobile station 408 through a beamformed signal 416. In some embodiments of this disclosure, base station 420 is capable of simultaneously beamforming to the mobile stations 402, 404, 406, and 408. In some embodiments, each beamformed signal is formed toward its intended mobile station at the same time and the same frequency. For the purpose of clarity, the communication from a base station to a mobile station may also be referred to known as downlink communication and the communication from a mobile station to a base station may be referred to as uplink communication.
Closed-loop fixed codebook transmit beamforming has been employed in many wireless system such as WIMAX or 3GPP LTE. Descriptions of such systems can be found, for example, in 3GPP TS36.211 “Evolved Universal Terrestrial Radio Access (E-UTRA): Physical Channel and Modulation” and IEEE 802.16e “Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems”. Both references are hereby incorporated by reference into this disclosure as if fully set forth herein. In a closed loop codebook beamforming system, a transmitter sends a pilot signal or channel sounding signal to a receiver, and the receiver measures the channel information and calculates the best codeword within a codebook that best matches the observed channel. The best codeword information is then fed back to the transmitter. The transmitter then uses the best codeword information for transmit antenna beamforming.
Flag for format0/format1A differentiation—1 bit where value 0 indicates format 0 and value 1 indicates format 1A.
localized/distributed virtual resource block (VRB) assignment flag—1 bit is set to ‘0’;
resource block assignment—┌log2(NRB DL(NRB DL+1)/2)┐ bits, where all bits are set to 1;
preamble index—6 bits; and
physical random access channel (PRACH) mask index—4 bits.
Localized/distributed VRB assignment flag—1 bit as defined in Section 7.1.6.3 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
Resource block assignment—┌log2(NRB DL(NRB DL+1)/2)┐ bits as defined in Section 7.1.6.3 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein;
for localized VRB, ┌log2(NRB DL(NRB DL+1)/2)┐ bits provide the resource allocation;
for distributed VRB,
if NRB DL<50 or if the format 1A CRC is scrambled by the random access radio network temporary identifier (RA-RNTI), the paging radio network temporary identifier (P-RNTI), or the system information radio network temporary identifier (SI-RNTI), ┌log2(NRB DL(NRB DL+1)/2)┐ bits provide the resource allocation.
1 bit, the most significant bit (MSB) indicates the gap value, where value 0 indicates Ngap=Ngap,1 and value 1 indicates Ngap=Ngap,2; and
(┌log2(NRB DL(NRB DL+1)/2)┐−1) bits provide the resource allocation.
Modulation and coding scheme (MCS)—5 bits as defined in Section 7.1.7 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
Hybrid automatic repeat request (HARQ) process number—3 bits for frequency division duplexing (FDD), 4 bits for time division duplexing (TDD).
New data indicator (NDI)—1 bit.
if NRB DL≧50 and the localized/distributed VRB assignment flag is set to 1:
the new data indicator bit indicates the gap value, where value 0 indicates Ngap=Ngap,1 and value 1 indicates Ngap=Ngap,2,
the new data indicator bit.
Transport power control (TPC) command for physical uplink control channel (PUCCH)—2 bits as defined in Section 5.1.2.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
the least significant bit of the TPC command indicates column NPRB 1A of the transport block size (TBS) table defined in 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
if least significant bit is 0, then NPRB 1A=2 else NPRB 1A=3.
Downlink assignment index (this field is present in TDD for all the uplink-downlink configurations. This field is not present in FDD)—2 bits.
If the number of information bits in format 1A belongs to one of the sizes in Table 5.3.3.1.2-1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, one zero bit is appended to format 1A.
HARQ process number; and
Downlink Assignment Index (used for TDD only and is not present in FDD).
In other embodiments, the DCI format 2A is defined for downlink open-loop spatial multiplexing in Section 5.3.3.1.5A of 3GPP TS 36.212 v 8.6.0, “E-UTRA, Multiplexing and Channel Coding”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
Resource allocation header (resource allocation type 0/type 1)—1 bit as defined in Section 7.1.6 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
for resource allocation type 0 as defined in Section 7.1.6.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein,
┌NRB DL/P┐ bits provide the resource allocation.
for resource allocation type 1 as defined in Section 7.1.6.2 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein,
┌log2(P)┐ bits of this field are used as a header specific to this resource allocation type to indicate the selected resource blocks subset.
(┌NRB DL/P┐−┌log2(P)┐−1) bits provide the resource allocation.
The value of P depends on the number of DL resource blocks as indicated in subclause [7.1.6.1] of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
TPC command for PUCCH—2 bits as defined in Section 5.1.2.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
Transport block to codeword swap flag—1 bit.
Modulation and coding scheme—5 bits as defined in Section 7.1.7 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
Precoding information—number of bits as specified in Table 5.3.3.1.5A-1 of 3GPP TS 36.212 v 8.6.0, “E-UTRA, Multiplexing and Channel Coding”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
If both transport blocks are enabled, the transport block to codeword mapping is specified according to Table 5.3.3.1.5-1 of 3GPP TS 36.212 v 8.6.0, “E-UTRA, Multiplexing and Channel Coding”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
If one of the transport blocks is disabled, the transport block to codeword swap flag is reserved, and the transport block to codeword mapping is specified according to Table 5.3.3.1.5-2 of 3GPP TS 36.212 v 8.6.0, “E-UTRA, Multiplexing and Channel Coding”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
The precoding information field is defined according to Table 5.3.3.1.5A-2 of 3GPP TS 36.212 v 8.6.0, “E-UTRA, Multiplexing and Channel Coding”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein. For a single enabled codeword, index 1 in Table 5.3.3.1.5A-2 is only supported for retransmission of the corresponding transport block if that transport block has previously been transmitted using two layers with open-loop spatial multiplexing.
Modulation order determination is defined for spatial multiplexing in Section 7.1.7.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
for DCI format 1A:
the UE sets the TBS index (ITBS) equal to IMCS and determine the TBS by the procedure in Section 7.1.7.2.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
for DCI format 1C:
the UE sets the TBS index (ITBS) equal to IMCS and determine the TBS from Table 7.1.7.2.3-1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
for 0≦IMCS≦28, the UE first determines the TBS index (ITBS) using IMCS and Table 7.1.7.1-1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein, except if the transport block is disabled in DCI formats 2 and 2A as specified below. For a transport block that is not mapped to two-layer spatial multiplexing, the TBS is determined by the procedure in Section 7.1.7.2.1 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein. For a transport block that is mapped to two-layer spatial multiplexing, the TBS is determined by the procedure in Section 7.1.7.2.2 of 3GPP TS 36.213 v8.6.0, “E-UTRA, Physical Layer Procedures”, March 2009, which is hereby incorporated by reference into the present application as if fully set forth herein.
for 29≦IMCS≦31, the TBS is assumed to be as determined from DCI transported in the latest PDCCH for the same transport block using 0≦IMCS≦28.
In DCI formats 2 and 2A, a transport block is disabled if IMCS=0 and if rvidx=1. Otherwise the transport block is enabled.
FIG. 6 illustrates reference signal patterns according to an embodiment of this disclosure.
FIG. 6 illustrates a 2-DRS pattern 610 and a 4-DRS pattern 620. Reference signal pattern 610 is an FDM/TDM pilot pattern that can support up to 2 layer transmissions. In reference pattern 610, the DRS REs are partitioned into two groups, the REs labeled with 0 and those with 1. The DRS REs labeled with 0 carry the DRS for layer 0, while the DRS REs labeled with 1 carry the DRS for layer 1.
Reference signal pattern 620 is a CDM/FDM pilot pattern that can support up to four layer transmissions, where DRS REs are again partitioned into two groups, those labeled with 0,1 and those with 2,3. For example, the DRS REs labeled with 0,1 carry the DRS for layers 0 and 1 where the two layers' RSs are code-division multiplexed (CDMed). In the two adjacent DRS REs labeled with 0,1, a DRS symbol r0 for layer 0 is mapped to the two REs spread by a Walsh code [1 1] that results in [r0 r0], while a DRS symbol r1 for layer 1 is mapped to the two REs spread by a Walsh code [1-1] that results in [r1-r1].
In one MU-MIMO transmission mode, for the first UE, i_DRS=0 meaning that the first DRS pattern, DRS(0), is used for this UE.
For the second UE, i_DRS=1 meaning that the second DRS pattern, DRS(1), is used for this UE.
FIG. 7 illustrates data sections and reference signal sections of the reference pattern 610 from the perspective of two user equipments according to an embodiment of this disclosure.
FIG. 7 illustrates the behavior/observation of the first and second UEs on the data section and the DRS section of the reference pattern 610. As shown in reference signal pattern 710, the first UE only sees DRS(0) as the pilot RE, and the other REs (other than CRS and DRS(0)) are seen by the first UE as data REs. On the other hand, as seen in reference signal pattern 720, the second UE only sees DRS(1) as the pilot RE, and other REs (other than CRS and DRS(1)) are seen by the second as data REs.
FIG. 8 illustrates data sections and reference signal sections of the reference pattern 610 from the perspective of two user equipments according to another embodiment of this disclosure.
In another MU-MIMO mode, for the first UE, N_DRS=2 and i_DRS=0 meaning that the first DRS pattern, DRS(0), is used for this UE. For the second UE, N_DRS=2 and i_DRS=1 meaning that the second DRS pattern, DRS(1), is used for this UE.
With these assumptions, FIG. 8 illustrates each UE's observation on the data section and the DRS section of the reference pattern 610 according to another embodiment of this disclosure. As shown in reference signal pattern 810, the first UE only sees DRS(0) as the pilot RE, and the REs (other than CRS DRS(0), and DRS(1)) are seen by the first UE as data REs. On the other hand, as seen in reference signal pattern 820, the second UE only sees DRS(1) as the pilot RE, and the REs (other than CRS, DRS(0), DRS(1)) are seen by the second UE as data REs.
Using the first MU-MIMO method, the first UE would receive DRS 0 together with stream 0, while the second UE would receive DRS 1 together with stream 1. FIG. 6 may be referred to for specific DRS patterns with FDM/TDM and with CDM. For example, in the FDM reference signal pattern 610, the first UE would receive the DRS in the RS REs with label 0, while the second UE would receive the DRS in the RS REs with label 1. If the first UE were to know that another UE is co-scheduled in the time-frequency resource where the first UE receives the downlink transmission, the first UE may try to estimate interfering channels in the other DRS REs (i.e., the RS REs with label 1) and use the interference information for demodulation.
Using the second MU-MIMO method, the first and second UEs' DRSs are not necessarily orthogonally multiplexed, and each UE assumes that there are no co-scheduled UEs in the time-frequency resource where the UEs receive the downlink transmission. In other words, in this MU-MIMO mode, the UEs expect SU-MIMO transmissions from the eNodeB. In one example, both the first and the second UEs would receive DRS in the same set of RS REs (e.g., RS REs with label 0 in FIG. 6).
c init=(└n s/2┘+1)·(2N ID cell+1)·216 +n RNTI, [Eqn. 1]
where ns is the slot id, NID cell is the cell id, and nRNTI is the UE-id or the RNTI number.
c init=(g+z+1)(└n s/2┘+1)·(2N ID cell+1)·216 +n RNTI, [Eqn. 2]
c init=(└n s/2┘+g+z+1)·(2N ID cell+1)·216 +n RNTI, [Eqn. 3]
c init=(└n s/2┘+1)·(2N ID cell+1)·216, [Eqn. 4]
c init=(g+1)(└n s/2┘+1)·(2N ID cell+1)·216, [Eqn. 5]
c init=(└n s/2┘+g+1)·(2NID cell+1)·216, [Eqn. 6]
Once the scrambling sequence is initialized, the scrambling sequences are generated, for example, according to the methods and systems described in U.S. Non-provisional patent application Ser. No. 12/749,340, filed Mar. 29, 2010, entitled “METHOD AND SYSTEM FOR MULTI-LAYER BEAMFORMING”, which is hereby incorporated by reference into the present application as if fully set forth herein.
FIG. 9 illustrates a system for generating and mapping reference signal sequences according to an embodiment of this disclosure.
As shown in FIG. 9, system 900 generates a plurality of RS sequences and maps the generated RS sequences onto a number of antenna ports in two steps. The generated RS sequences can be mapped onto either cell-specific antenna ports or UE-specific (or dedicated) antenna ports.
FIG. 10A illustrates a table 1000 summarizing downlink control information (DCI) formats used for downlink (DL) grants according to an embodiment of this disclosure.
As shown in table 1000, normal transmission mode is scheduled by DCI format 2A′, regardless of whether the transmission is configured by C-RNTI or semi-persistent scheduling (SPS) C-RNTI. In this embodiment, please note that 2A′ refers to a slightly modified version of format 2A. In normal transmission mode, a UE can receive up to two streams and up to two DRSs associated with the two streams, and an eNodeB can schedule up to two data streams and up to two DRSs to a number of UEs in a unit of time-frequency resource. UEs in normal transmission mode are aware that the DRS REs for the two DRSs do not carry data symbols for themselves. On the other hand, fallback modes are scheduled by DCI format 1A. When a DL transmission is configured by C-RNTI, the fallback transmission is a transmit diversity or a single-layer beamforming scheme. When a DL transmission is configured by SPS C-RNTI, the fallback transmission is single layer beamforming, where the DRS port index is signaled semi-statically in the upper layer other than the PHY layer. An eNodeB may schedule up to two UEs with different DRS port indices assigned by the higher layer in the same time frequency resource by transmitting up to two DCI format 1A to up to two UEs.
FIG. 10B illustrates a method 1010 of operating a base station according to an embodiment of this disclosure.
As shown in FIG. 10B, the method 1010 comprising scrambling cyclic redundancy check (CRC) bits of a downlink control information (DCI) format using a cell radio network temporary identifier (C-RNTI) for dynamic scheduling, and scrambling the CRC bits of the DCI format using a semi-persistent scheduling (SPS) C-RNTI for semi-persistent scheduling (block 1011).
FIG. 10C illustrates a method 1050 of operating a subscriber station according to an embodiment of this disclosure.
As shown in FIG. 10C, the method 1050 includes receiving a downlink transmission grant from a base station (block 1051). The method 1050 also includes de-scrambling cyclic redundancy check (CRC) bits of the downlink transmission grant using a cell radio network temporary identifier (C-RNTI) key, and de-scrambling the CRC bits of the downlink transmission grant using a semi-persistent scheduling (SPS) C-RNTI key (block 1053).
FIG. 11 illustrates a table 1100 showing a mapping of enabled codewords to a stream index and a dedicated reference signal (DRS) index according to an embodiment of this disclosure.
FIG. 12 illustrates a table 1200 showing a mapping of a new data indicator (NDI) bit of a disabled codeword to a stream index and a dedicated reference signal (DRS) index according to an embodiment of this disclosure.
As shown in FIG. 12, the stream (and the DRS) index is indicated using an NDI bit for a disabled CW in a DCI format, and the mapping of the NDI bit of a disabled CW to the stream index and the DRS index can be described, for example, as shown in table 1200.
FIG. 13 illustrates a method 1300 of operating a base station or eNodeB according to another embodiment of this disclosure.
In some embodiments, the choice of the DRS scrambling method is indicated by an eNodeB to a UE using the downlink grant. As shown in FIG. 13, an eNodeB determines if a cell-specific or a UE-specific scrambling method is being used to scramble the DRSs of a scheduled UE (block 1301). If the eNodeB determined that a cell-specific scrambling method is to be used, the eNodeB sends a DL grant conveying information on the cell-specific scrambling method used by the eNodeB (block 1303), and scrambles the DRSs for the scheduled UE using the cell-specific scrambling method (block 1305). If the eNodeB determined that a UE-specific scrambling method is to be used, the eNodeB sends a DL grant conveying information on the UE-specific scrambling method used by the eNodeB (block 1307), and scrambles the DRSs for the scheduled UE using the UE-specific scrambling method (block 1309). The eNodeB then maps the DRSs and data to the time-frequency map of a subframe (block 1311), and transmits the data streams along with corresponding data DRSs to the scheduled UE (block 1313).
FIG. 14 illustrates a method 1400 of operating a subscriber station according to another embodiment of this disclosure.
As shown in FIG. 14, a scheduled UE receives a DL grant from a base station or eNodeB (block 1401). The DL grant conveys information on the DRS scrambling method used by the eNodeB. The subscriber station also receives data streams along with corresponding DRSs (block 1403). The subscriber station reads the information in the DL grant to determine if a cell-specific or a UE-specific scrambling method is being used to scramble the DRSs (block 1405). If a cell-specific scrambling method is being used to scramble the DRSs, the subscriber station de-scrambles the DRSs according the cell-specific scrambling method (block 1407). If a UE-specific scrambling method is being used to scramble the DRSs, the subscriber station de-scrambles the DRSs according the UE-specific scrambling method (block 1409).
FIG. 15 illustrates a table 1500 depicting two states of a downlink (DL) grant according to an embodiment of this disclosure.
FIG. 16 illustrates a table 1600 depicting two states of a downlink (DL) grant using a one-bit field according to an embodiment of this disclosure.
In this particular embodiment, a first value of “0” in the one-bit field indicates the first state in which cell-specific scrambling of the DRS sequence is used. A second value of “1” in the one-bit field indicates the second state in which UE-specific scrambling of the DRS sequence is used.
FIG. 17 illustrates a table 1700 depicting use of the number of enabled transport blocks (TBs) to indicate the choice of cell-specific scrambling or UE-specific scrambling according to an embodiment of this disclosure.
As shown in table 1700, the number of enabled TBs (1 or 2) in the DL grant is used to indicate the choice of cell-specific scrambling or UE-specific scrambling. This embodiment is applicable for the DCI formats that can indicate two TBs, for example, the 2A′ DCI format mentioned above (which is based on 2A). For the case when the DCI format only supports 1 TB, the choice of scrambling method is dependent on the transmission schemes. For example, if the transmit diversity is used, then UE-specific scrambling is adopted. Conversely, if a single-DRS port scheme is used, cell-specific scrambling is adopted.
In this embodiment, please note that 1A′ refers to a slightly modified version of format 1A. Also, current Rel-8 only allows combination of C-RNTI with Transmit Diversity, and SPS-RNTI with single DRS-port transmission scheme. However, in Rel-9 and beyond, the other two combinations (C-RNTI with single DRS-port, and SPS-RNTI with Transmit diversity) may also be possible.
For the case of DCI format 2A or 2A′, one of ordinary skill in the art would recognize that the above embodiment can be combined with any method of indicating the DRS port index. For the case of DCI format 1A or 1A′, one of ordinary skill in the art also would recognize that the above embodiment can be combined with a semi-static indication of the DRS port index such as by radio resource control (RRC) signaling, or a fixed indication of the DRS port such as by associating the DRS port index with a UE ID, etc.
In one embodiment of this disclosure, an existing bit in a particular DL grant is re-interpreted to indicate these two states. This embodiment is also applicable for the DCI formats that can indicate two TBs, for example, the 2A′ DCI format mentioned above (which is based on 2A).
FIG. 18 illustrates a table 1800 depicting use of an existing bit in a particular downlink (DL) grant to indicate the choice of cell-specific scrambling or UE-specific scrambling according to an embodiment of this disclosure.
Again, one of ordinary skill in the art would recognize that, for the case of DCI format 2A or 2A′, this embodiment can be combined with any method of indicating the DRS port index. For the case of DCI format 1A or 1A′, one of ordinary skill in the art also would recognize that this embodiment can be combined with a semi-static indication of the DRS port index such as by RRC signaling, or a fixed indication of the DRS port such by associating the DRS port index with a UE ID, etc.
FIG. 19 illustrates a method 1900 of operating a base station or eNodeB according to yet another embodiment of this disclosure.
In some embodiments, the choice of the DRS scrambling method is indicated by an eNodeB to a UE using a radio resource control (RRC) message. As shown in FIG. 19, an eNodeB determines if a cell-specific or a UE-specific scrambling method is being used to scramble the DRSs of a scheduled UE (block 1901). If the eNodeB determined that a cell-specific scrambling method is to be used, the eNodeB sends an RRC message conveying information on the cell-specific scrambling method used by the eNodeB (block 1903), and scrambles the DRSs for the scheduled UE using the cell-specific scrambling method (block 1905). If the eNodeB determined that a UE-specific scrambling method is to be used, the eNodeB sends an RRC message conveying information on the UE-specific scrambling method used by the eNodeB (block 1907), and scrambles the DRSs for the scheduled UE using the UE-specific scrambling method (block 1909). The eNodeB then maps the DRSs and data to the time-frequency map of a subframe (block 1911), and transmits the data streams along with corresponding data DRSs to the scheduled UE (block 1913).
FIG. 20 illustrates a method 2000 of operating a subscriber station according to yet another embodiment of this disclosure.
As shown in FIG. 20, a scheduled UE receives an RRC message from a base station or eNodeB (block 2001). The RRC message conveys information on the DRS scrambling method used by the eNodeB. The subscriber station also receives data streams along with corresponding DRSs (block 2003). The subscriber station reads the information in the RRC message to determine if a cell-specific or a UE-specific scrambling method is being used to scramble the DRSs (block 2005). If a cell-specific scrambling method is being used to scramble the DRSs, the subscriber station de-scrambles the DRSs according the cell-specific scrambling method (block 2007). If a UE-specific scrambling method is being used to scramble the DRSs, the subscriber station de-scrambles the DRSs according the UE-specific scrambling method (block 2009).
FIG. 21 illustrates a search space composed of a set of consecutive the control channel element (CCEs) according to an embodiment of this disclosure.
Given a search space, a UE attempts to find control messages intended for itself by searching throughout the nodes in the tree 2100 shown in FIG. 21, where each node in the tree 2100 corresponds to an aggregation of 1, 2, 4 or 8 CCEs. For example, the node 2101 corresponds to an aggregation of 8 consecutive CCEs whose leaf nodes have contact, i.e., CCEs 0, 1, . . . 7. Given an aggregation of CCEs, a UE assumes a certain DCI format, extracts information bits in the aggregation, and compares the extracted RNTI with the UE's RNTI. Once a UE determines that the extracted RNTI is the same as its RNTI, the UE determines that the decoded control message is intended to itself.
As shown in FIGS. 4 and 5, an eNodeB may send a number of data streams to a number of UEs, and this operation is called a multi-user MIMO (MU-MIMO) operation. In one transmission mode, an eNodeB is able to transmit up to two streams in a time-frequency resource, and up to two UEs may receive at least one stream each in the time-frequency resource. In another transmission mode, an eNodeB is able to transmit up to four streams in a time-frequency resource, and up to four UEs may receive at least one stream each in the time-frequency resource.
For example, for the demodulation of stream #0, a UE estimates channels using DRS #0 where DRS #0 is precoded with the same precoder used to precode the data stream #0. For the demodulation of stream #1, a UE estimates channels using DRS #1 where DRS #1 is precoded with the same precoder used to precode the data stream #1. For example, with the reference signal pattern 610 of FIG. 6, the DRS REs for DRS #0 are the RS REs labeled with 0, while the DRS REs for DRS #1 are the RS REs labeled with 1. On the other hand, with the reference signal pattern 620 of FIG. 6, the DRS #0 is multiplexed with DRS #1 in the same set of pairs of RS REs, and a Walsh code [1 1] is used for DRS #0, while a Walsh code [1-1] is used for DRS #1.
In a given transmission mode and given an indication of the stream and DRS indices, a UE demodulates its data streams by estimating the channels associated with the streams using the associated DRSs. Stream or DRS indices together with the restrictions made in a transmission mode let the UE know where to find DRS symbols and data symbols in the time-frequency map. For example, when FDM/TDM pilots in FIG. 6 are used for a UE in transmission mode A, a UE finds the DRS symbols and data symbols as illustrated in FIG. 8 based on the DRS index signaled to itself.
In a first part of this disclosure, UEs in transmission mode A will be considered. In transmission mode A, a UE can receive up to two streams and up to two DRSs associated with the two streams, and an eNodeB can schedule up to two data streams and up to two DRSs at most to a number of UEs in a unit of time-frequency resource. The UE's behavior when a stream index is signaled can be described as shown in FIG. 8, in the case of FDM/TDM pilots, for example. For UEs in transmission mode A, four methods of indicating the stream index are provided.
FIG. 22 illustrates a method 2200 of operating an eNodeB or base station according to a first embodiment of this disclosure.
As shown in FIG. 22, an eNodeB pairs two UEs (UE#0 and UE#1) for a time-frequency resource (block 2201). The two UEs have UE-IDs with different even-odd parity. The eNodeB then precodes the data stream and the associated DMRS for each of the two UEs (block 2203). The eNodeB maps the DMRS in REs for DRS #0 for UE#0 and maps the DMRS in REs for DRS #1 for UE#1 (block 2205). The eNodeB also maps the combination of the two precoded signals for the two UEs in the data REs (block 2207). The eNodeB then transmits downlink transmission grant(s) assigning the time-frequency resource to the two UEs (block 2209) and transmits the signals in the time-frequency resource to the two UEs (block 2211).
FIG. 23 illustrates a method 2300 of operating a UE or subscriber station according to a first embodiment of this disclosure.
As shown in FIG. 23, a UE receives a transmission grant and a set of signals in a time-frequency resource assigned by the transmission grant from an eNodeB (block 2301). The UE then determines if the UE's UE-ID is even (block 2303). If the UE's UE-ID is even, the UE extracts signals from the REs for DRS#0 (block 2305). If the UE's UE-ID is not even, the UE extracts signals from the REs for DRS#1 (block 2307). The UE then estimates the channels in the assigned time-frequency resource using the extracted signals (block 2309). The UE also demodulates the intended data stream in the assigned time-frequency resource using the estimated channels (block 2311).
FIG. 24 illustrates a method 2400 of operating an eNodeB or base station according to a second embodiment of this disclosure.
As shown in FIG. 24, an eNodeB pairs two UEs (UE#0 and UE#1) for a time-frequency resource (block 2401). The eNodeB then precodes the data stream and the associated DMRS for each of the two UEs (block 2403). In some embodiments, the precoders used for the two UEs can be different from one another. The eNodeB maps the DMRS in REs for DRS #0 for UE#0 and maps the DMRS in REs for DRS #1 for UE#1 (block 2405). The eNodeB also maps the combination of the two precoded signals for the two UEs in the data REs (block 2407). The eNodeB then transmits downlink transmission grant(s) to UE#0 in a set of consecutive CCEs starting at an even index and transmits downlink transmission grant(s) to UE#1 in a set of consecutive CCEs starting at an odd index (block 2409). The eNodeB then transmits the signals in the time-frequency resource to the two UEs (block 2411).
FIG. 25 illustrates a method 2500 of operating a UE or subscriber station according to a second embodiment of this disclosure.
As shown in FIG. 25, a UE receives a transmission grant and a set of signals in a time-frequency resource assigned by the transmission grant from an eNodeB (block 2501). The UE then determines if the first CCE number that carried the transmission grant is even (block 2503). If the first CCE number that carried the transmission grant is even, the UE extracts signals from the REs for DRS#0 (block 2505). If the first CCE number that carried the transmission grant is not even, the UE extracts signals from the REs for DRS#1 (block 2507). The UE then estimates the channels in the assigned time-frequency resource using the extracted signals (block 2509). The UE also demodulates the intended data stream in the assigned time-frequency resource using the estimated channels (block 2511).
FIG. 26 illustrates a linkage between a location of a control channel element (CCE) aggregation and a stream (or DRS) ID according to an embodiment of this disclosure.
FIG. 27 illustrates a method 2700 of operating an eNodeB or base station according to a third embodiment of this disclosure.
As shown in FIG. 27, an eNodeB pairs two UEs (UE#0 and UE#1) for a time-frequency resource (block 2701). The eNodeB then precodes the data stream and the associated DMRS for each of the two UEs (block 2703). In some embodiments, the precoders used for the two UEs can be different from one another. The eNodeB maps the DMRS in REs for DRS #0 for UE#0 and maps the DMRS in REs for DRS #1 for UE#1 (block 2705). The eNodeB also maps the combination of the two precoded signals for the two UEs in the data REs (block 2707). The eNodeB then transmits a transmission grant to UE#0 in an aggregation of 1, 2 or 4 CCEs, where the aggregation is allocated on the left hand side of the tree in the UE-specific search space and transmits a transmission grant to UE#1 in an aggregation of 1, 2 or 4 CCEs, where the aggregation is allocated on the right hand side of the tree in the UE-specific search space (block 2709). The eNodeB then transmits the signals in the time-frequency resource to the two UEs (block 2711).
FIG. 28 illustrates a method 2800 of operating a UE or subscriber station according to a third embodiment of this disclosure.
As shown in FIG. 28, a UE receives a transmission grant and a set of signals in a time-frequency resource assigned by the transmission grant from an eNodeB (block 2801). The UE then determines if the transmission grant is carried in a CCE aggregation that is located in the left hand side of the tree in the UE-specific search space (block 2803). If the transmission grant is carried in a CCE aggregation that is located in the left hand side of the tree in the UE-specific search space, the UE extracts signals from the REs for DRS#0 (block 2805). If the transmission grant is carried in a CCE aggregation that is located in the right hand side of the tree in the UE-specific search space, the UE extracts signals from the REs for DRS#1 (block 2807). The UE then estimates the channels in the assigned time-frequency resource using the extracted signals (block 2809). The UE also demodulates the intended data stream in the assigned time-frequency resource using the estimated channels (block 2811).
FIG. 29 illustrates downlink (DL) formats according to embodiments of this disclosure.
The assigned DRS (stream) indices and the enabled CWs when different TBs are enabled and different values are assigned in TB-to-CW swap bits are summarized as illustrated in table 1100 of FIG. 11. In this particular embodiment, the fourth column (the assigned DRS indices) of table 1100 is determined based on the values in the first three columns.
x (0)(i)=d (n — cw)(i), and
M symb layer =M symb (n — cw)
where n_cw is the enabled CW index, i=0, 1, . . . , Msymb layer−1 and Msymb layer=Msymb (n — cw) is the number of modulation symbols in the enabled CW.
FIG. 30 illustrates a method 3000 of operating an eNodeB or base station according to a fourth embodiment of this disclosure.
As shown in FIG. 30, an eNodeB pairs two UEs (UE#0 and UE#1) for a time-frequency resource (block 3001). The eNodeB receives TB#1 for UE#0 and TB#1 for UE#1 from a higher layer (block 3003). The eNodeB then maps CW#0 to layer #0 and maps CW#1 to layer #1 (block 3005). The eNodeB also precodes the data stream and the associated DMRS for UE#0 (layer #0) and UE#1 (layer #1) (block 3007). The eNodeB then maps the DMRS in REs for DRS #0 for UE#0 and maps the DMRS in REs for DRS #1 for UE#1 (block 3009). The eNodeB also maps the combination of the two precoded signals for the two UEs in the data REs (block 3011). The eNodeB then disables TB#2 and clears the TB-to-CW swap bit in the DL grant for UE#0, and disables TB#2 and sets the TB-to-CW swap bit in the DL grant for UE#1 (block 3013). The eNodeB then transmits the two DL grants and data signals to the two UEs (block 3015).
FIG. 31 illustrates a method 3100 of operating a UE or subscriber station according to a fourth embodiment of this disclosure.
As shown in FIG. 31, a UE receives a transmission grant and a set of signals in a time-frequency resource assigned by the transmission grant from an eNodeB (block 3101). The UE then determines if the CW#0 in the transmission grant is enabled (block 3103). If the CW#0 in the transmission grant is enabled, the UE extracts signals from the REs for DRS#0 (block 3105). If the CW#1 in the transmission grant is enabled, the UE extracts signals from the REs for DRS#1 (block 3107). The UE then estimates the channels in the assigned time-frequency resource using the extracted signals (block 3109). The UE also demodulates the intended data stream in the assigned time-frequency resource using the estimated channels (block 3111). The UE also determines if the TB-to-CW swap flag in the transmission grant is set (block 3113). If the TB-to-CW swap flag in the transmission grant is set, the UE determines that CW#0 corresponds to TB#2 and CW#1 corresponds to TB#1 (block 3115). If the TB-to-CW swap flag in the transmission grant is not set, the UE determines that CW#0 corresponds to TB#1 and CW41 corresponds to TB#2 (block 3117).
In a second part of this disclosure, UEs in transmission mode B are considered. In transmission mode B, a UE can receive up to two streams and up to two DRSs associated with the two streams, and an eNodeB can schedule up to four data streams and up to four DRSs to a number of UEs in a unit of time-frequency resource. In this transmission mode, UEs are aware that the DRS REs for the four DRSs do not carry data symbols for themselves. In a particular embodiment, a type of RS pattern, such as the reference signal pattern 620 of FIG. 6, is considered. In this type of RS pattern, one set of DRS REs are reserved for streams 0 and 1, while another set of distinct DRS REs are reserved for streams 2 and 3. The first and the second set of DRS REs are referred to as DRS RE set 0 and DRS RE set 1, respectively.
FIG. 32 illustrates a table 3200 used to indicate a number of streams according to an embodiment of this disclosure.
FIG. 33 illustrates the use of a DRS set indicator flag to indicate a DRS RE set index according to an embodiment of this disclosure.
In one embodiment of this disclosure, an additional field, the DRS set indicator flag, is added to the downlink grant to indicate the DRS RE set index (or I_set), so that a UE receiving the DL grant identifies the DRS REs intended for itself and uses the DRS REs to estimate the channels for the demodulation of the assigned streams. The DRS set indicator flag identifies the DRS RE set. For example, as shown in FIG. 33, when DRS set indicator flag is 0, the DRS RE set 0 is selected. When DRS set indicator flag is 1, the DRS RE set 1 is selected. FIG. 33 illustrates the implication of a bit value in the DRS set indicator flag when the CDM/FDM pattern of the reference signal pattern 620 of FIG. 6 is used as a DRS pattern.
FIG. 34 illustrates a DCI format according to an embodiment of this disclosure.
In this embodiment, a new DCI format 3400 adds two additional fields to format 1A: a 1-bit DRS set indicator flag 3401 used to determine I_set, and a 1-bit stream indicator field 3403 used to indicate the stream index within the set, or I_stream_set.
In a particular embodiment, an eNodeB can indicate one stream index in the downlink grant, 0, 1, 2 or 3, as shown in table 3200.
FIG. 35 illustrates a DCI format according to another embodiment of this disclosure.
FIG. 36 illustrates a table 3600 used to map assigned DRSs or stream indices according to an embodiment of this disclosure.
In a third part of this disclosure, UEs in transmission mode C will be considered. In transmission mode C, a UE can receive up to two streams and up to two DRSs associated with the two streams, and an eNodeB can schedule up to four data streams and up to four DRSs to a number of UEs in a unit of time-frequency resource, just as in transmission mode B. The difference between transmission mode C and transmission mode B is that each UE in transmission mode C receives an indication from an eNodeB as to which DRSs are allocated for the UE and other UEs in the assigned resources and thus is aware of the exact position of DRS REs that do not carry data symbols. In a type of RS pattern such as that shown in the reference signal pattern 620 of FIG. 6, one set of DRS REs are reserved for streams 0 and 1, while another set of distinct DRS REs are reserved for streams 2 and 3. The first and the second set of DRS REs are referred to as DRS RE set 0 and DRS RE set 1, respectively.
FIG. 37 illustrates a use of bit values in the DRS set indicator flag and DRS set number flag according to an embodiment of this disclosure.
Upon receiving the DRS set indicator flag, a UE identifies the DRS REs intended for itself and uses the DRS REs to estimate the channels for the demodulation of the assigned streams. Upon receiving the set number flag, a UE is informed as to whether data symbols are in the other DRS RE set or not. The DRS set indicator flag identifies the DRS RE set. For example, when DRS set indicator flag is 0, the DRS RE set 0 is selected; when DRS set indicator flag is 1, the DRS RE set 1 is selected. On the other hand, the set number field identifies the number of DRS RE sets. For example, if the set number flag is 0, then the number of DRS RE sets is one. In this case, the UE can receive data symbols in the REs in the other DRS RE set which the UE does not receive DRSs. If the set number flag is 1, then the number of DRS RE sets is two. In this case, the UE does not expect to receive data symbols in the REs in the other DRS RE set which the UE does not receive DRSs. FIG. 37 illustrates the implication of bit values in the DRS set indicator flag and DRS set number flag when the reference signal pattern 620 of FIG. 6, for example, is used as a DRS pattern.
FIG. 38 illustrates a DCI format according to a further embodiment of this disclosure.
In this embodiment, a new DCI format 3800 adds three additional fields to format 1A: a 1-bit DRS set indicator flag 3801 used to determine i_set, a one-bit stream indicator field 3803 used to indicate the stream index within the set, or I_stream_set, and a one-bit DRS set number field 3805 used to indicate whether the other set of DRS REs carry data or not. In this embodiment, an eNodeB can indicate one stream index in the downlink grant, 0, 1, 2 or 3 as shown table 3200, and indicate whether the other set of DRS REs carry data or not as shown in FIG. 37.
FIG. 39 illustrates a DCI format according to a yet another embodiment of this disclosure.
FIG. 40 illustrates a DCI format according to a yet further embodiment of this disclosure.
In this embodiment, an additional field, the DRS allocation bitmap, is added to the downlink grant to indicate the assigned DRS indices, so that a UE receiving the DL grant can identify the DRS REs intended for itself and use the DRS REs to estimate the channels for the demodulation of the assigned streams. The number of bits in the DRS allocation bitmap is the same as the total number of streams that can be multiplexed in a time-frequency resource. If a bit in the i-th position in the DRS allocation bitmap is 0 in a DL grant for a UE, this implies that stream i−1 and DRS i−1 are transmitted to the UE. Otherwise, stream i−1 and DRS i−1 are not transmitted to the UE. For example, when DRS allocation bitmap is [0 1 0 1], streams (and DRSs) 1 and 3 are allocated to the UE, while streams (and DRSs) 0 and 2 are not allocated to the UE.
FIG. 41 illustrates a table 4100 used to map assigned DRSs or stream indices according to another embodiment of this disclosure.
2. A base station in accordance with claim 1 wherein the fallback format is further defined as DCI format 1A according to 3rd Generation Partnership Project (3GGP) standards.
3. A base station in accordance with claim 1 wherein the dual-layer beamforming format is further defined a modified DCI format 2A according to 3rd Generation Partnership Project (3GGP) standards.
4. A base station in accordance with claim 1 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the base station is further configured to generate a value in a new data indicator field of the dual-layer beamforming format that corresponds to a DRS port index of an enabled transport block in the downlink transmission grant.
5. A base station in accordance with claim 1 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the base station is further configured to generate a value in a new data indicator field of the dual-layer beamforming format that corresponds to a DRS port index of an enabled codeword in the downlink transmission grant.
7. A method in accordance with claim 6 wherein the fallback format is further defined as DCI format 1A according to 3rd Generation Partnership Project (3GGP) standards.
8. A method in accordance with claim 6 wherein the dual-layer beamforming format is further defined a modified DCI format 2A according to 3rd Generation Partnership Project (3GGP) standards.
9. A method in accordance with claim 6 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the method further comprises generating a value in a new data indicator field of the dual-layer beamforming format that corresponds to a DRS port index of an enabled transport block in the downlink transmission grant.
10. A method in accordance with claim 6 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the method further comprises generating a value in a new data indicator field of the dual-layer beamforming format that corresponds to a DRS port index of an enabled codeword in the downlink transmission grant.
12. A subscriber station in accordance with claim 11 wherein the fallback format is further defined as DCI format 1A according to 3rd Generation. Partnership Project (3GGP) standards.
13. A subscriber station in accordance with claim 11 wherein the dual-layer beamforming format is further defined a modified DCI format 2A according to 3rd Generation Partnership Project (3GGP) standards.
14. A subscriber station in accordance with claim 11 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the subscriber station is further configured to determine a DRS port index of an enabled transport block in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
15. A subscriber station in accordance with claim 11 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the subscriber station is further configured to determine a DRS port index of an enabled codeword in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
17. A method in accordance with claim 16 wherein the fallback format is further defined as DCI format 1A according to 3rd Generation Partnership Project (3GGP) standards.
18. A method in accordance with claim 16 wherein the dual-layer beamforming format is further defined as a modified DCI format 2A according to 3rd Generation Partnership Project (3GGP) standards.
19. A method in accordance with claim 16 wherein if the dual-layer beamforming format is used, to indicate a single-DRS port transmission scheme, the method further comprises determining a DRS port index of an enabled transport block in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
20. A method in accordance with claim 16 wherein if the dual-layer beamforming format is used to indicate a single-DRS port transmission scheme, the method further comprises determining a DRS port index of an enabled codeword in the downlink transmission grant using a value in a new data indicator field of the dual-layer beamforming format.
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JP2012515995A JP5624131B2 (en) 2009-06-18 2010-06-18 Method and system for indicating the method used to scramble a dedicated reference signal
EP10789762.1A EP2443778A4 (en) 2009-06-18 2010-06-18 Method and system for indicating method used to scramble dedicated reference signals
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