WO2014194479A1 - 传输四天线预编码矩阵的方法、用户设备和基站 - Google Patents
传输四天线预编码矩阵的方法、用户设备和基站 Download PDFInfo
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- WO2014194479A1 WO2014194479A1 PCT/CN2013/076735 CN2013076735W WO2014194479A1 WO 2014194479 A1 WO2014194479 A1 WO 2014194479A1 CN 2013076735 W CN2013076735 W CN 2013076735W WO 2014194479 A1 WO2014194479 A1 WO 2014194479A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0645—Variable feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
Definitions
- the wireless system can achieve diversity and array gain by Beamforming (BF), precoding, and receive combining.
- BF Beamforming
- a signal vector received by a typical system using BF or precoding can usually be represented by the following equation (1):
- y H Vs + n ( 1 ) where y represents the received signal vector, H represents the channel matrix, V represents the precoding matrix, s represents the transmitted symbol vector, and 11 represents the measurement noise.
- Optimal precoding usually requires the transmitter to fully know the channel state information (Channel State)
- the CSI information fed back by the UE may include a Rank Indicator ("RI"), precoding.
- RI Rank Indicator
- precoding Matrix Indicator simply referred to as " ⁇ ”
- CQI Channel Quality Indicator
- RI and PMI indicate the number of layers used and the precoding matrix, respectively.
- SU-MIMO Single User MIMO
- the precoding matrix or codeword needs to meet the 8 Phase Shift Keying (8PSK) constraint. This limits the accuracy of spatial quantization, which makes performance severely limited for transmission methods that are sensitive to spatial quantization accuracy such as Multiple User MIMO (“Multi-MIMO”).
- 8PSK Phase Shift Keying
- the 3rd Generation Partnership Project (3GPP) LTE system needs to further enhance the performance of MU-MIMO, and the system also introduces coordinated multi-point transmission (Coordinated Multi).
- -Point referred to as "CoMP” technology.
- CoMP technology is based on single-cell feedback, so the above two types Technology has placed higher demands on feedback performance. Since the capacity of the feedback channel is limited, the size of the codebook set is also limited, which puts higher requirements on the design of the codebook.
- the 3GPP LTE R8 system uses a single codebook, and the precoding matrix is indicated by RI and PMI.
- the correspondence between RI and PMI and each codeword in the codebook is as shown in Table 1:
- the precoding matrix with an index of 0-7 is a Discrete Fourier Transform ("DFT") vector, the DFT vector.
- DFT Discrete Fourier Transform
- UOA Uniform Linear Array
- Equation (3) means:
- the codebook structure of 8 antennas is given below.
- the codebook structure is designed according to a dual-polarized antenna.
- Table 2 shows that the rank is 1 (that is, the number of transmission layers is 1 layer).
- Table 3 shows an 8 antenna codebook with a rank of 1 (ie, 2 layers of transmission layers);
- Table 4 shows an 8 antenna code with a rank of 3 (ie, 3 layers of transmission layers)
- Table 5 shows an 8-antenna codebook with a rank of 4 (ie, 4 layers of transmission layers).
- Pre-coding matrix index antenna 8 may be performed by a first codebook index 3 ⁇ 4; and the second codebook index represents 2, the antenna 8 for rank 1 codebook, first codebook index 3 ⁇ 4; and the second codebook index ⁇ 2 requires 4 bits to represent.
- the PMI can be represented by 4 bits, which requires subsampling of the PMI or 8 antenna codebook, where the physical uplink control channel of the 8 antennas (Physical Uplink Control Channel) , abbreviated as "PUCCH”)
- the sub-mode 2 downsampling codebook of mode 1-1 is shown in Table 6.
- the codebook structure design scheme of 8 antennas can be used, and the index of the precoding matrix can also be used by the first codebook.
- the index and the second codebook index 4 are indicated.
- the PMI can also be represented by 4 bits, which also requires subsampling of the PMI or 4 antenna codebook.
- the mode is sub-mode 2 of PUCCH mode 1-1
- the codebook downsampling is performed following the 8-antenna down-sampling codebook as shown in Table 6,
- the precoding matrix has only 2 DFT vectors
- the 4 antenna codebook of the R8 system has 8 DFT vectors.
- the configured antenna is a uniform linear array ULA antenna
- 4 The antenna enhancement codebook is in submode 2 of PUCCH mode 1-1.
- the precoding matrix suitable for the ULA antenna is less than the precoding matrix of the R8 system, and the performance loss is severe. Summary of the invention
- Embodiments of the present invention provide a method, a user equipment, and a base station for transmitting a four-antenna precoding matrix, which can indicate more precoding matrices suitable for a uniform linear array antenna without changing feedback modes and feedback bits.
- a first aspect provides a method for transmitting a four-antenna precoding matrix, the method comprising: determining a rank for indicating a number of transmission layers; determining a first precoding matrix in a codebook set corresponding to the rank, the code The precoding matrix included in the set is represented by the first codebook index and the second codebook index; determining a first precoding matrix indicating the first precoding matrix indicating the PMI and the second PMI, the first PMI and the The first codebook index has a first correspondence relationship, the second PMI has a second correspondence relationship with the second codebook index, and the first PMI and the second PMI for indicating the first precoding matrix are sent to the base station.
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of ⁇ is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1, 3, 5, 7, 9, 11, 13, 15 ⁇ .
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the precoding matrix set corresponding to the first codebook index corresponding to the first PMI includes precoding matrices U1 and U2, the precoding matrix U1 And U2 are indicated by a second codebook index, wherein
- the precoding matrix W included in the codebook set is determined by Table A:
- n and k are non-negative integers; represent the first codebook index; 2 represents the second codebook index.
- the codebook set when determining that the rank is 2, includes a precoding matrix W by the table B1 or B2 determines:
- determining that the rank is 1 The first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second codebook index corresponding to the second PMI are determined by the table C1, C2, C3, or C4:
- determining that the rank is 2 The value of n ranges from the set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9, 10, 11 , 12, 13 , 14, 15 ⁇ .
- a method for transmitting a four-antenna precoding matrix comprising: determining a rank for indicating a number of transmission layers; and determining a first codebook index corresponding to a precoding matrix set in the codebook set a value of the codebook set corresponding to the rank, the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index; determining, corresponding to the rank and the value of the first codebook index a joint coded value, where the joint coded value has a first correspondence with the rank, and the joint The coded value has a second correspondence with the first codebook index; the joint coded value is sent to the base station, where the codebook set includes a precoding matrix W that satisfies the equation:
- a first codebook index corresponds to a value of n, and the value range of the n is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11 , 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1, 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11, 13, 15 ⁇ .
- ⁇ e , 6 ⁇ ) 2 -, when ⁇ is, ⁇ ⁇ ) is ⁇ (1), when ⁇ is, ⁇ ⁇ ) is ⁇ (2), when ⁇ is, it is ⁇ (3) , when ⁇ is, ⁇ ( ) is ⁇ (4); e, indicating a column vector with a dimension of 4x1, the i-th element in the 6 ; is 1, the remaining elements are all 0, and i 2, 3, 4 ⁇ ; A is a constant.
- W where e; represents a column vector having a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the joint coding value is carried
- the joint code value corresponds to the rank and the first codebook index. It is determined by the following list D:
- a method for transmitting a four-antenna precoding matrix comprising: determining a rank indicating a number of transmission layers; determining, in a codebook set corresponding to the rank, a first precoding matrix, where the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index;
- the second precoding matrix indicating the first precoding matrix indicates a PMI, wherein the second PMI has a first correspondence with the second codebook index, and for a given first codebook index, the first The second codebook index corresponding to the value range of the second PMI is a true subset of the value range of the second codebook index; and the second PMI for indicating the first precoding matrix is sent to the base station, where , the precoding matrix W included in the codebook set satisfies the equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0, 1 2 3, 4 5 6 7, 8 9 10 11 12, 13 , 14 15 ⁇ ;
- the first code corresponding to the first code I i a set of precoding matrixes and a second precoding matrix set corresponding to the first codebook index la+8 are mutually exclusive, wherein
- the first codebook index ⁇ represents a first codebook index corresponding to n of the value a
- the first codebook index. +8 denotes the first codebook index corresponding to n of the value a+8, ae ⁇ 0 1 2, 3, 4 5 6, 7 ⁇ .
- ⁇ e ⁇ (0 2 — ", when ⁇ is ⁇ , it is ⁇ (1), when ⁇ is e 2 , ct(0 is ⁇ (2), when ⁇ is 6 3 , ⁇ () is ⁇ (3) , when ⁇ is e 4 , is ⁇ (4); e, represents a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are all 0, and i
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- determining that the rank is 2 The relationship between the second PMI, the first codebook index, and the second codebook index is determined by the table F1 or F2:
- / fMi2 represents the second ⁇ ; represents the first codebook index; 2 represents the second codebook index.
- determining that the rank is 3 Or 4 the precoding matrix included in the codebook set corresponding to the rank is:
- the four precoding matrices of the codebook index in Table G are 4-7; or
- the four precoding matrices of the codebook index in Table G are 12-15.
- a fourth aspect provides a method for transmitting a four-antenna precoding matrix, the method comprising: receiving a rank sent by a user equipment to indicate a number of transmission layers, and a first precoding matrix indicating a PMI and a second PMI; Determining, in the codebook set corresponding to the rank, a first precoding matrix according to the first PMI and the second PMI, where the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index, where The first PMI has a first correspondence with the first codebook index, and the second PMI has a second correspondence with the second codebook index; wherein the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of ⁇ is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1, 3, 5, 7, 9, 11, 13, 15 ⁇ .
- ⁇ £ ⁇ , , , ⁇ , ⁇ (, ⁇ ) 2 —, when ⁇ is, ⁇ ⁇ ) is ⁇ (1), when ⁇ is, ⁇ ⁇ ) is ⁇ (2), when ⁇ is 6 3 , is ⁇ (3), when ⁇ is, ⁇ (4); e, indicating a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are 0, and ie ⁇ l, 2, 3, 4 ⁇ ; A is a constant.
- W 2 satisfies the equation: ⁇ , ⁇ 2 e 1 ), (3 ⁇ 4 , e 2 ), (e 3 , e 3 ), (e 4 , e 4 ), (e 1 , ), ( , ), , e 4 ), (e 2 , w Y 2 — 1 Y: Y 2 1 Y: Y 2 1 Y 2 —
- the precoding matrix set corresponding to the first codebook index corresponding to the PMI includes precoding matrices U1 and U2, and the precoding matrices U1 and U2 are indicated by a second codebook index, where U1
- the precoding matrix W included in the codebook set is determined by Table A :
- m and k are non-negative integers; represent the first codebook index; represent the second codebook index.
- the codebook set when the received rank is 2, includes a precoding matrix W by the table B1 or ⁇ 2 determines:
- w ⁇ 2 - 1 e 1 em, m and k are non-negative integers; , indicating the first codebook index; 2 indicating the second codebook index.
- the range of n is the set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
- a fifth aspect provides a method for transmitting a four-antenna precoding matrix, the method comprising: receiving a joint coding value sent by a user equipment; and correspondingly, according to the joint code value and the joint code value and the rank and the first codebook index Determining a value of the first codebook index and a rank indicating the number of transmission layers, where the value of the first codebook index corresponds to a precoding matrix set in the codebook set, and the codebook set corresponds to the rank
- the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index, and the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook bow I corresponds to a value of n, and the value range of the n is a set ⁇ 0 , 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10 , 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1, 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11, 13, 15 ⁇ .
- ⁇ e , ⁇ (0 2 — ", when ⁇ is ⁇ , is ⁇ (1), when ⁇ is e 2 , ct(0 is ⁇ (2), when ⁇ is 6 3 , ⁇ ( ) Is ⁇ (3), when ⁇ is e 4 , it is ⁇ (4); e, which represents a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are all 0, and i 2, 3 , 4 ⁇ ; A is a constant.
- the joint coding value is carried When the number of bits is four, the correspondence between the joint code value and the rank and the first codebook index is determined by the following list D:
- the joint code value is represented; RI represents the rank; ⁇ represents the first codebook index.
- the joint coding value is carried When the number of bits is three, the correspondence between the joint code value and the rank and the first codebook index is determined by the following list E:
- a sixth aspect provides a method for transmitting a four-antenna precoding matrix, the method comprising: receiving, by a user equipment, a second precoding matrix indication PMI, a first codebook index, and a rank indicating a number of transmission layers; Determining, in the codebook set corresponding to the rank, a first precoding matrix according to the second PMI and the first codebook index, where the codebook set includes a precoding matrix by a first codebook index and a second codebook The index indicates that the second PMI has a first correspondence with the second codebook index, and for a given first codebook index, the value of the second codebook index corresponding to the value range of the second PMI The range is a true subset of the value range of the second codebook index, where the precoding matrix W included in the codebook set satisfies an equation: _
- a first codebook index corresponds to a value of n, and the value range of n is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13 , 14, 15 ⁇ ;
- the first codebook index is in the precoding matrix set determined by the first codebook index and the second codebook index corresponding to the value range of the second PMI. Corresponding first precoding matrix set and first codebook index!;. The +8 corresponding second precoding matrix set is mutually exclusive, wherein the first codebook index. And indicating a first codebook index corresponding to n of the value a, the first codebook index +8 indicating a first codebook index corresponding to n of the value a+8, ae ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇
- ⁇ ⁇ 6 ⁇ ⁇ (, ⁇ ) 2 - 3 ⁇ 4, when ⁇ too, ⁇ ⁇ ) is ⁇ (1), when the last ⁇ , ⁇ ⁇ ) is ⁇ (2), when the ⁇ 6 3, Is ⁇ (3), when ⁇ is, it is ⁇ (4); e, indicating a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are all 0, and ie ⁇ l, 2, 3, 4 ⁇ ; A is a constant.
- the received rank is 2
- e is a column vector with a dimension of 4x1, where the i-th element is 1, the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the received rank is At 2 o'clock
- the relationship between the second PMI, the first codebook index, and the second codebook index is determined by the table F1 or F2:
- / ⁇ 2 indicates the second PMI; ⁇ ; indicates the first codebook index; and 4 indicates the second codebook index.
- the received rank is 3 or 4
- the precoding matrix included in the codebook set corresponding to the rank is:
- the four precoding matrices of the codebook index in Table G are 4-7; or
- the four precoding matrices of the codebook index in Table G are 12-15.
- the seventh aspect provides a user equipment, where the user equipment includes: a determining module, configured to determine a rank for indicating a number of transmission layers; the determining module is further configured to: in the codebook set corresponding to the rank a first precoding matrix, the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index; the determining module is further configured to determine a first preamble for indicating the first precoding matrix
- the coding matrix indicates a PMI and a second PMI, the first PMI has a first correspondence with the first codebook index, and the second PMI has a second correspondence with the second codebook index; Transmitting, by the determining module, the first PMI and the second PMI for indicating the first precoding matrix, where the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the range of ⁇ is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ ⁇ 8, 9, 10, 11, 12 , 13, 14, 15 ⁇ ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1, 3, 5, 7, 9, 11, 13, 15 ⁇
- e represents a column vector with a dimension of 4x1, the i-th element in the is 1, the remaining elements Both are 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the precoding matrix set corresponding to the first codebook index corresponding to the PMI includes precoding matrices U1 and U2, and the precoding matrices U1 and U2 are indicated by a second codebook index, where
- the precoding matrix W included in the codebook set is configured by Table A determines:
- n and k are non-negative integers; represent the first codebook index; 2 represents the second codebook index.
- the precoding matrix W included in the codebook set is Table B1 or B2 determines:
- ⁇ denotes the first codebook index
- 2 denotes the second codebook index
- the determining module determines whether the rank is 1, the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second codebook index corresponding to the second PMI are represented by a table C1 C3 or C4 Determine:
- the range of ⁇ is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9, 10, 11 , 12, 13 , 14, 15 ⁇ .
- the eighth aspect provides a user equipment, where the user equipment includes: a determining module, configured to determine a rank for indicating a number of transmission layers; the determining module is further configured to determine, to determine, a set of precoding matrices in the codebook set a value of a first codebook index, the codebook set corresponding to the rank, the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index; the determining module is further configured to determine a joint coded value corresponding to the value of the first codebook index, where the joint coded value has a first correspondence with the rank, and the joint coded value has a second correspondence with the first codebook index; And a module, configured to send, to the base station, the joint coding value determined by the determining module, where the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of n, and the value range of the n is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11 , 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1 , 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11 , 13, 15 ⁇ .
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the joint coding value is carried When the number of bits is four, the correspondence between the joint code value and the rank and the first codebook index is determined by the following list D:
- the ninth aspect provides a user equipment, where the user equipment includes: a determining module, configured to determine a rank for indicating a number of transmission layers; the determining module is further configured to determine, in the codebook set corresponding to the rank, a first a precoding matrix, the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index; the determining module is further configured to determine a second precoding matrix indication used to indicate the first precoding matrix a PMI, where the second PMI has a first correspondence with the second codebook index, and for a given first codebook index, the second codebook index corresponding to the value range of the second PMI
- the value range is a true subset of the value range of the second codebook index; the sending module is configured to send, to the base station, a second PMI that is determined by the determining module to indicate the first precoding matrix, where the codebook set
- the included the user equipment includes: a determining module, configured to determine a rank for indicating a number
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0,
- the determining module determines that the rank is 2, in the precoding matrix set determined by the first codebook index and the second codebook index corresponding to the second ⁇ value range, the first codebook index ⁇
- the first precoding matrix set corresponding to ⁇ is mutually exclusive with the second precoding matrix set corresponding to the first codebook index s , wherein the first codebook index is 1 .
- e represents a column vector having a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and ie ⁇ l 2 3, 4 ⁇ ; B is a constant.
- a third possible implementation manner of the ninth aspect determined by the determining module When the rank is 2, the relationship between the second PMI, the first codebook index, and the second codebook index is determined by the table F1 or F2:
- / fMi2 represents the second PMI; represents the first codebook index; 4 represents the second codebook index.
- the precoding matrix included in the codebook set corresponding to the rank is: 4 precoding matrices in which the codebook index is 0-3 in Table G; or
- the four precoding matrices of the codebook index in Table G are 4-7; or
- the four precoding matrices of the codebook index in Table G are 12-15.
- a base station includes: a receiving module, configured to receive a rank sent by a user equipment to indicate a number of transmission layers, and a first precoding matrix indicating a PMI and a second PMI; Determining, in the codebook set corresponding to the rank received by the receiving module, a first precoding matrix according to the first PMI and the second PMI received by the receiving module, the codebook
- the precoding matrix included in the set is represented by a first codebook index and a second codebook index, the first PMI has a first correspondence with the first codebook index, and the second PMI and the second codebook index have a first a two-correspondence relationship; wherein the pre-code matrix W included in the codebook set is full:
- a first codebook index corresponds to a value of n, and the value range of n is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1, 3, 5, 7, 9, 11, 13, 15 ⁇ .
- ⁇ e , a() 2(i - 3 ⁇ 4 , when ⁇ is , ⁇ ⁇ ) is ⁇ (1), when ⁇ is e 2 , ⁇ ⁇ ) is ⁇ (2), when ⁇ is 6 3
- ⁇ ( ⁇ ) ⁇ (3), when ⁇ is, ⁇ ( ⁇ ) is ⁇ (4)
- e indicating a column vector with a dimension of 4x1, the i-th element in the is 1, and the rest The elements are all 0, and i e ⁇ l, 2, 3, 4 ⁇ ; A is a constant.
- the W 2 received by the receiving module satisfies the equation:
- the precoding matrix set corresponding to the first codebook index corresponding to the first PMI includes precoding matrices U1 and U2, The precoding matrices U1 and U2 are indicated by a second codebook index, wherein
- the precoding matrix W included in the codebook set is Table A determines:
- n and k are non-negative integers; represent the first codebook index; 2 represents the second codebook index.
- the precoding matrix W included in the codebook set is Table B1 or B2 determines:
- k is a non-negative integer; represents the first codebook index; 2 represents the second codebook index.
- the receiving module receives:
- the rank is 1
- the first ⁇ , the second ⁇ , the first codebook index corresponding to the first PMI, and the second codebook index corresponding to the second PMI are represented by tables C1, C2, and C3.
- C4 determines:
- the receiving module receives the rank is 2, the range of ⁇ is the set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9, 10, 11 , 12, 13 , 14, 15 ⁇ .
- the eleventh aspect provides a base station, where the base station includes: a receiving module, configured to receive a joint code value sent by the user equipment; and a determining module, configured to receive, according to the joint code, the joint code value and the joint code value and the rank Corresponding to the first codebook index, determining a value of the first codebook index and a rank indicating the number of transmission layers, where the value of the first codebook index corresponds to a precoding matrix set in the codebook set
- the codebook set corresponds to the rank
- the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11 , 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1, 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11, 13, 15 ⁇ .
- e is a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and ie ⁇ l, 2, 3, 4 ⁇ ; B Is a constant.
- l RIIPMn represents the joint coded value
- RI represents the rank
- the base station includes: a receiving module, configured to receive a second precoding matrix sent by the user equipment An indication, a first codebook index, and a rank indicating a number of transmission layers; a determining module, configured to: in the codebook set corresponding to the rank received by the receiving module, according to the second UI received by the receiving module Determining, by the first codebook index, a first precoding matrix, where the precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index, where the second ⁇ and the second codebook index have a first a corresponding relationship, and for a given first codebook index, the value range of the second codebook index corresponding to the value range of the second ⁇ is a true subset of the value range of the second codebook index,
- the precoding matrix W included in the codebook set satisfie
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0,
- the first codebook index ii When the received rank is 2, in the precoding matrix set determined by the first codebook index and the second codebook index corresponding to the second ⁇ value range, the first codebook index ii ,. Corresponding first precoding matrix set and first codebook index. +8 corresponding second precoding matrix set mutually exclusive, wherein the first codebook index /. Representing a first codebook index corresponding to n of the value a, the first codebook index +S indicating a first codebook index corresponding to n having a value of a+8, ae ⁇ 0, 1,
- the rank received by the module is 2
- the relationship between the second PMI, the first codebook index, and the second codebook index is determined by the table F1 or F2:
- / ⁇ 2 represents the second PMI; 3 ⁇ 4; represents the first codebook index; 4 represents the second codebook index.
- the precoding matrix included in the codebook set corresponding to the rank is: 4 precoding matrices in which the codebook index is 0-3 in Table G; or
- the four precoding matrices of the codebook index in Table G are 4-7; or
- the codebook index in Table G is 4 precoding matrices of 12-15.
- the method, the user equipment, and the base station for transmitting the four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding suitable for the uniform linear array antenna without changing the feedback mode and the feedback bit.
- the matrix is guaranteed to not affect the performance of the dual-polarized antenna, which improves system performance and enhances the user experience.
- FIG. 1 is a schematic flow chart of a method of transmitting a four-antenna precoding matrix according to an embodiment of the present invention.
- the figure is another schematic flow chart of a method of transmitting a four-antenna precoding matrix according to an embodiment of the present invention.
- FIG. 3 is still another schematic flowchart of a method of transmitting a four-antenna precoding matrix according to an embodiment of the present invention.
- FIG. 4 is a schematic flow chart of a method of transmitting a four-antenna precoding matrix according to another embodiment of the present invention.
- FIG. 5 is another schematic flowchart of a method of transmitting a four-antenna precoding matrix according to another embodiment of the present invention.
- FIG. 6 is still another schematic flowchart of a method of transmitting a four-antenna precoding matrix according to another embodiment of the present invention.
- FIG. 7 is a schematic block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 8 is another schematic block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 9 is still another schematic block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 10 is a schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 11 is another schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 12 is still another schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 13 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
- FIG. 14 is another schematic block diagram of a user equipment according to another embodiment of the present invention.
- FIG. 15 is still another schematic block diagram of a user equipment according to another embodiment of the present invention.
- FIG. 16 is a schematic block diagram of a base station according to another embodiment of the present invention.
- FIG. 17 is another schematic block diagram of a base station according to another embodiment of the present invention.
- FIG. 18 is still another schematic block diagram of a base station according to another embodiment of the present invention. detailed description
- GSM Global System of Mobile communication
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- FDD frequency division duplex
- TDD LTE time division duplex
- UMTS Universal Mobile Telecommunication System
- WiMAX Global Interoperability for Microwave Access
- a user equipment may be referred to as a terminal, a mobile station (Mobile Station, referred to as "MS"), or a mobile terminal (Mobile Terminal).
- the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or “cellular", telephone Or a computer or the like having a mobile terminal, for example, the user device may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.
- RAN Radio Access Network
- the base station may be a base station (Base Transceiver Station, referred to as "BTS") in GSM or CDMA, or may be a base station (NodeB, abbreviated as “NB,”) in WCDMA, or may be LTE.
- BTS Base Transceiver Station
- NodeB base station
- NB base station
- the evolved base station (Evolutional Node B, abbreviated as "ENB or e-NodeB”) is not limited in the present invention, but for convenience of description, the following embodiments will be described by taking ENB as an example.
- FIG. 1 shows a schematic flow diagram of a method 10 of transmitting a four-antenna precoding matrix, which may be performed, for example, by a user equipment, in accordance with an embodiment of the present invention.
- the method 10 includes:
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1 , 3, 5, 7, 9, 11 , 13, 15 ⁇ .
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna without changing the feedback mode and the feedback bit, and can ensure that the application is not affected.
- the performance of the dual-polarized antenna can improve system performance and enhance user risk.
- the user equipment may determine a rank indicating the number of transmission layers, for example, based on channel state information ("CSI") or the like.
- CSI channel state information
- the UE may determine the rank by a method well known to those skilled in the art, and in this case, in S12, the user equipment UE may be, for example, based on CSI or the like, in the codebook set corresponding to the rank, A first precoding matrix used when the UE expects the base station eNB to transmit downlink data is determined. All precoding matrices included in the codebook set corresponding to the rank may be represented, for example, by the first codebook index and the second codebook index 2 .
- the value range of the first codebook index is 0 ⁇ ⁇ 15
- the value range of the second codebook index is 0 ⁇ 2 ⁇ L 2 -1 , where is a positive integer
- the value range of L 2 is 1 ⁇ ⁇ 15
- the value range of the second codebook index i 2 is , for example, 0 ⁇ 2 ⁇ 15.
- the UE may determine a first PMI and a second PML for indicating the first precoding matrix, that is, in the embodiment of the present invention, all the precoding moments included in the codebook set corresponding to the rank are one codebook.
- the index and the second codebook index i 2 indicate that the first PMI can also be
- the first PMI codebook index and the first station may have a first correspondence relationship
- the correspondence relationship may be a first function
- the second PMI / ⁇ 2 and the second codebook index may have a second correspondence
- the second correspondence may be a function relationship or a mapping relationship, for example, the second PMI ⁇ ⁇ 2 It is used to indicate the value sequence number and the like in the value range of the second codebook index i 2 .
- the set formed by the precoding matrix represented by the first PMI / ⁇ ⁇ 1 and the second PMI / ⁇ 2 is a true subset of the codebook set, that is, in the embodiment of the present invention, the transmitted fourth
- the antenna precoding matrix is a four-antenna precoding matrix that performs subsampling.
- the user equipment sends the first PMI for indicating the first precoding matrix to the base station, for example, on a PUCCH channel, a Physical Uplink Shared Channel (PUSCH) or other channel. And the second PMI.
- PUSCH Physical Uplink Shared Channel
- the user equipment sends the first PMI and the second PMI for indicating the first precoding matrix to the base station on an uplink channel.
- the uplink channel may be a channel such as PUCCH or PUSCH.
- the user equipment transmits the first PMI and the second PMI for indicating the first precoding matrix on one PUCCH, or the user equipment transmits the first one of the first precoding matrix on one PUSCH.
- PMI and the second PMI may also send a first PMI and a second PMI for indicating the first precoding matrix to the base station, and the embodiment of the present invention is not limited thereto.
- the precoding matrix W included in the codebook set corresponding to the rank satisfies the equation (4):
- a first codebook index corresponds to a value of n
- the value range of the n is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6, 8, 10, 12, 14 ⁇ or ⁇ 1, 3, 5, 7, 9, 11, 13, 15 ⁇ .
- the first codebook index is the same as the value of n.
- the embodiment of the present invention is only described by taking the same value of the first codebook index and n as an example, but the present invention is not limited thereto.
- the value of n is uniquely determined by the value of the first codebook index.
- the value range of the n is a set ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
- ⁇ e , a( ) 2(I -, when ⁇ is , it is ⁇ (1), when ⁇ is e 2 , Ct(0 is ⁇ (2), when ⁇ is, ⁇ () is ⁇ (3), when ⁇ is, it is ⁇ (4); e, indicating column vector with dimension 4x1, the ith of the ith The element is 1, the remaining elements are all 0, and i 2, 3, 4 ⁇ ; A is a constant.
- the precoding matrix W included in the codebook set is determined by Table A:
- m and k are non-negative integers; represent the first codebook index; represent the second codebook index.
- W 2 satisfies the equation (6): W, e
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the precoding matrix W included in the codebook set is determined by the table B1 or B2:
- the Wi, !. 2 can correspond to W 2 .
- the embodiment of the present invention is described by taking only the first codebook index and the second codebook index in Table A, Table B1, and Table B2 and their values, but the present invention or other index values are used.
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna without changing the feedback mode and the feedback bit, and can ensure that the application is not affected.
- the performance of the dual-polarized antenna can improve system performance and enhance user body.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook index corresponding to the second PMI.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook index corresponding to the second PMI, and the method includes: the second PMI corresponding to the second PMI.
- the value range of the second codebook index is uniquely determined by the value and/or the value range of the first codebook index corresponding to the first PMI.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook index corresponding to the second PMI, and includes:
- the value range of the first codebook index corresponding to the first PMI includes at least two first value sets that are different from each other, and the value range of the second codebook index corresponding to the second PMI includes an element mutual The at least two second set of values that are different from each other have a corresponding relationship with the at least two second set of values.
- first set of values is equal to the number of sets of second values. It should also be understood that the elements in the first set of values are different from each other, and the elements in the second set of values are also different from each other.
- the value range of the first codebook corresponding to the first PMI is associated with the value range of the second codebook corresponding to the second PMI.
- the relationship includes: the value range of the first codebook index corresponding to the first PMI includes at least two first value sets different from each other, and the value of the second codebook index corresponding to the second PMI
- the range includes at least two second set of values that are different from each other, and the at least two first set of values have a corresponding relationship with the at least two second set of values.
- first set of values is equal to the number of sets of second values. It should also be understood that the elements in the first set of values are different from each other, and the elements in the second set of values are also different from each other.
- each of the at least two first value sets includes at least two values
- each of the at least two second value sets includes at least two Value
- the transmission precoding of the embodiment of the present invention is related to the value range of the first codebook index corresponding to the first PMI and the value range of the second codebook index corresponding to the second PMI.
- the matrix method can indicate more precoding matrices suitable for uniform linear array antennas without changing the feedback mode and feedback bits, and can ensure that the performance applied to the dual polarized antenna is not affected, thereby improving the system. Performance, and enhance the user's body.
- the following describes an example of the relationship between the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second codebook index corresponding to the second PMI.
- the rank is 1, the first PMI, the second PML, the first codebook index corresponding to the first PMI, and the corresponding to the second PMI
- the second codebook index is determined by Table C1:
- the 4-antenna codebook according to the embodiment of the present invention is not inferior to the codebook of 3GPP LTER8, and the 4-antenna codebook according to the embodiment of the present invention
- Each precoding matrix included is suitable for dual polarized antennas.
- C1 table can be drawn, as the range / ⁇ 1 or i is 0, the corresponding value * 2 is in the range of (0, 2); when the range / ⁇ 1 is 1; 2 corresponding to the taken
- the value is the range is (4, 6); when the value range is 2; the corresponding value of 2 is (8, 10); when / ⁇ is the value range is 3; the corresponding value is The range is (12, 14); when / ⁇ 1 has a value range of 4; the corresponding value of 2 is (1, 3); when the value of the dish is 5; the value of the corresponding 2 is The range is (5, 7); when / PM lodge is in the range of 6; the corresponding value of 2 is (9, 11); when the value is in the range of 7; the corresponding value is the range is (13, 15). That / ⁇ 2 corresponding values or ranges of the i 2 / ⁇ 1 corresponding values or ranges associated.
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna in the case of performing codebook downsampling without changing the feedback mode and the feedback bits.
- each precoding matrix in the downsampled codebook set can be applied to the dual-polarized antenna, thereby ensuring that the performance applied to the dual-polarized antenna is not affected, and the system performance can be improved, and the user experience is enhanced.
- the first ⁇ , the second ⁇ , the first codebook index corresponding to the first ⁇ , and the second ⁇ corresponding to the second ⁇ is determined by Table C2:
- the first ⁇ , the second ⁇ , the first codebook index corresponding to the first ⁇ , and the second ⁇ corresponding to the second ⁇ is determined by Table C3:
- the 4-antenna codebook according to the embodiment of the present invention is not inferior to the codebook of 3GPP LTE R8, and the 4 antenna according to the embodiment of the present invention
- Each precoding matrix included in the codebook is suitable for dual polarized antennas.
- the I view for example, satisfies the following equation (10):
- the first ⁇ , the second ⁇ , the first codebook index corresponding to the first ⁇ , and the second ⁇ corresponding to the second ⁇ is determined by Table C4:
- the precoding matrix W determined by the first codebook index; and the second codebook index! ⁇ 2 can be determined by the table, and will not be described again for brevity.
- the base station may first configure a channel state information reference signal (CSI-RS) for the UE, specifically, for the N t antenna or N t antenna ports of the base station, The base station allocates resources of the antenna ports of the N t CSI-RSs to the UE, where N t is a natural number, for example, N t is equal to 4 UEs, thereby measuring channel quality on the corresponding CSI-RS resources, and determining that the UE expects the eNB to send RI PMI CQI and so on used for downlink data.
- CSI-RS channel state information reference signal
- the UE may feed the CSI to the base station on the feedback resource allocated by the eNB to the UE. For example, if the feedback mode configured by the base station to the UE is the sub-mode 2 of the PUCCH mode 1-1, the UE feeds back the RI on the subframe of the feedback RI, and feeds back the subframe of the first PMI I PMn and the second PMI / fMi p CQI. Feedback on separate / 2 and 01. For the sake of cleanliness, we will not repeat them here.
- the feedback mode configured by the base station to the UE is the sub-mode 2 of the PUCCH mode 1-1
- the UE feeds back the RI on the subframe of the feedback RI, and feeds back the subframe of the first PMI I PMn and the second PMI / fMi p CQI. Feedback on separate / 2 and 01. For the sake of cleanliness, we will not repeat them here.
- the precoding matrix set may be referred to as a codebook, and each precoding matrix in the precoding matrix set may be referred to as a codeword, but the present invention is not limited thereto.
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention has an association relationship between the value range of the first codebook index corresponding to the first PMI and the value range of the second codebook index corresponding to the second PMI. It is possible to indicate more precoding matrices suitable for a uniform linear array antenna in the case of performing codebook downsampling without changing the feedback mode and feedback bits, and each precoding matrix in the downsampled codebook set is It can be applied to dual-polarized antennas, thus ensuring that it does not affect the performance of dual-polarized antennas, and can improve system performance and enhance user experience.
- FIG. 2 shows another schematic flow diagram of a method 20 of transmitting a four-antenna precoding matrix, which may be performed, for example, by a user equipment, in accordance with an embodiment of the present invention.
- the method 20 includes:
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook bow I corresponds to a value of n, and the value range of the n is a set ⁇ 0 , 1 , 2, 3 , 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10 , 11, 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1, 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11, 13, 15 ⁇ .
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix, thereby improving system performance and enhancing user experience.
- the value range of the first codebook index ⁇ is. ⁇ ⁇
- the second codebook index has a value range of 0 ⁇ 2 ⁇ L 2 -1 , where is a positive integer, for example, L 2 has a value range of 1 ⁇ ⁇ 15, that is, the second codebook index i 2
- the value range is, for example, 0 ⁇ 2 ⁇ 15.
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the sub-mode 1 of the PUCCH mode 1-1 is used for transmission, it is necessary to design a scheme of rank RI and joint coding.
- the rank is 2, a plurality of repeated precoding matrices are included for the four antenna codebook determined by the table B1 (corresponding to the formula (6)) or the table B2 (corresponding to the formula (7)).
- scheme 1 For the scheme represented by equation (6) (hereinafter referred to as scheme 1) and the scheme represented by formula (7) (hereinafter referred to as scheme 2), W satisfies:
- the four-antenna codebook of rank 3 or rank 4 uses the codebook in R8 in R12, for a codebook of rank 3 or rank 4, the corresponding one is a unit matrix, and no bit is needed. Said.
- sub-mode 1 of PUCCH mode 1-1 is used to transmit the rank and the PMI of the precoding matrix, the rank sum, ; joint coding, and for; is downsampled, but at this time 2 is not downsampled.
- n corresponding to the downsampled ⁇ in X tract is 0-7 or 8-15, instead of It is desirable that n has a value range of 0, 2, 4, 6, 8, 10, 12, 14 or 1, 3, 5, 7, 9, 11, 13, 15, etc. In this way, repeated matrices can be avoided.
- the corresponding n has a value range of 0-7 or 8-15, and may include all directions, so that it can be consistent with the case of rank 2.
- n in the X corresponding to i after downsampling is (0, 2, 4, 6) or (1, 3, 5, 7) or (8, 10, 12, 14) or (9, 11, 13, 15). In this way, for all the vectors in walnut, the space can be evenly divided or the beam direction can be divided equally.
- n Z values in (0, 2, 4, 6, 8, 10, 12, 14) Or Z values in (1 3, 5, 7, 9, 11, 13 15).
- a vector in X tract[1 ⁇ ⁇ denotes a direction, which can be represented by X, where X is an integer, and X has a value range of 0-31. Since ⁇ is +32 .
- ⁇ is in the range of values For (0, 2, 4, 6)
- all directions (vectors) in ⁇ mari are represented by X, which can be 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Can divide the space evenly.
- the correspondence between the joint coded value and the rank and the first codebook index is from the following list D. Determine:
- e J - ⁇ ' ⁇ 3 ⁇ 4 wm and k are non-negative integers; represent the first codebook index; 2 denotes the second codebook index.
- the precoding matrix W included in the codebook set is determined by the table B1 or B2:
- k is a non-negative integer; represents the first codebook index; 2 represents the second codebook index.
- the joint coded value represents a value for jointly coding the rank and the first ,, and is not described herein again.
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the precoding matrix after the sample is transmitted when the precoding matrix is transmitted in the submode 1 of the PUCCH mode 1-1. Improve system performance and enhance the user experience.
- FIG. 3 illustrates yet another schematic flow diagram of a method 30 of transmitting a four-antenna precoding matrix, which may be performed, for example, by a user equipment, in accordance with an embodiment of the present invention.
- the method 30 includes: 531. Determine a rank used to indicate a number of transmission layers.
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of n, and the value range of n is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13 , 14, 15 ⁇ ;
- the first codebook is Ii Ua
- the corresponding first precoding matrix set and the second precoding matrix set corresponding to the first codebook index la+8 are mutually exclusive, wherein the first codebook index represents the first codebook corresponding to the value a Index, the first codebook index!;,. +8 represents the first codebook index corresponding to n with a value of a+8, ae ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ .
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix, thereby improving system performance and enhancing user experience.
- the value range of the first codebook index is 0 ⁇ ; ⁇ 15, and the value range of the second codebook index ⁇ is. ⁇ ⁇ ⁇ , where is a positive integer, for example, the value range is 1 ⁇ L 2 ⁇ 15 , that is, the value range of the second codebook index i 2 is , for example, 0 ⁇ 2 ⁇ 15.
- W 2 satisfies the above equation (5):
- ⁇ ⁇ is ⁇ (4)
- e represents a column vector with a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- W e where, represents a column vector with a dimension of 4x1, where the i-th element is 1, the remaining elements are all 0, and i 2, 3, 4 ⁇ ; B is a constant.
- the relationship between the second PMI, the first codebook index, and the second codebook index is represented by a table.
- Fl or F2 determines:
- / fMi2 represents the second PMI; represents the first codebook index; 4 represents the second codebook index.
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna without changing the feedback mode and the feedback bit, and can ensure that the application is not affected.
- the performance of the dual-polarized antenna can also avoid the problem of overlapping code words after downsampling, thereby improving system performance and enhancing user ambiguity.
- the precoding matrix included in the codebook set corresponding to the rank is:
- the four precoding matrices of the codebook index in Table G are 4-7; or
- the four precoding matrices of the codebook index in Table G are 12-15.
- the determined rank is 3 or 4
- the precoding matrix included in the codebook set corresponding to the rank is 4 precoding matrices in which the codebook index is 0-3 or 4-7 in the table G. If the rank back is performed and the rank is 1 and the rank is 1, four uniform DFT vectors can be obtained. These DFT vectors are applicable to the ULA antenna, and the four DFT vectors are also applicable to the dual-polarized antenna.
- the four precoding matrices are The precoding matrix used in the open loop, and the minimum chord spacing of the four precoding matrices is large.
- the precoding matrix W included in the codebook set is determined by Table A:
- n and k are non-negative integers; represent the first codebook index; 2 represents the second codebook index.
- the precoding matrix W included in the codebook set is determined by the table B1 or ⁇ 2:
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix when the pre-coding matrix is transmitted by using the PUCCH mode 2-1, thereby improving system performance, and Enhance the user experience.
- a method for transmitting a four-antenna precoding matrix according to an embodiment of the present invention is described in detail from the perspective of a user equipment, and will be described below in connection with FIG. 4 to FIG. A method of transmitting a four-antenna precoding matrix according to an embodiment of the present invention is described.
- a method 60 of transmitting a four-antenna precoding matrix may be performed by a base station, the method 60 including:
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of n, and the value range of n is a set ⁇ 0, 1 2, 3, 4 5 6 7 ⁇ ⁇ 8, 9 10, 11 , 12, 13, 14 15 ⁇ ⁇ 0, 2 4 6 8, 10, 12, 14 ⁇ or ⁇ 1 , 3, 5 , 7, 9, 11 , 13, 15 ⁇
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna without changing the feedback mode and the feedback bit, and can ensure that the application is not affected.
- the performance of the dual-polarized antenna can improve system performance and enhance user experience.
- the base station may receive the PMI sent by the UE by using the CSI information sent by the UE, and the CSI information may further include an RI, a CQI, and the like.
- the base station can obtain the precoding matrix fed back by the UE according to the RI and the PMI, and can obtain the channel quality when the precoding matrix is used according to the CQI.
- the base station may use the precoding matrix to precode the downlink data of the UE, and according to the CQI, determine a modulation and coding mode for transmitting the downlink data.
- the base station may pass the zero-forward (Zero Forcing, referred to as "ZF" according to the precoding matrix fed back by the UE and the precoding matrix fed back by the UE.
- ZF Zero-forward
- the method of " ) can obtain a precoding matrix that eliminates multiuser interference.
- the base station can use the precoding matrix to precode the downlink data of the multi-user MIMO.
- the base station can determine, according to the CQI fed back by the two users, a modulation and coding manner when the two users perform multi-user MIMO transmission. For the sake of brevity, it will not be repeated here.
- W 2 satisfies the equation:
- the precoding matrix W included in the codebook set is determined by Table A:
- n and k are non-negative integers; represent the first codebook index; 2 represents the second codebook index.
- W 2 satisfies the equation:
- W 2 satisfies the equation:
- W, , ) ⁇ w a column vector representing a dimension of 4x1, where the i-th element is 1, and the remaining elements are all 0, and ie ⁇ l, 2, 3, 4 ⁇ ; B is a constant.
- the precoding matrix W included in the codebook set is determined by the table B1 or B2:
- k are non-negative integers; represent the first codebook index; ⁇ denotes the second codebook index.
- the value range of the n is a set ⁇ 0, 1 , 2, 3, 4, 5, 6, 7 ⁇ or ⁇ 8, 9 , 10, 11 , 12, 13 , 14, 15 ⁇ .
- the precoding matrix set corresponding to the first codebook index corresponding to the first PMI includes precoding matrices U1 and U2, and the precoding matrices U1 and U2 are configured by the second Codebook index indication, where
- the method for transmitting a four-antenna precoding matrix in the embodiment of the present invention can indicate more precoding matrices suitable for a uniform linear array antenna without changing the feedback mode and the feedback bit, and can ensure that the application is not affected.
- the performance of the dual-polarized antenna can improve system performance and enhance user experience.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook index corresponding to the second PMI.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook index corresponding to the second PMI, and the method includes: the second PMI corresponding to the second PMI.
- the value range of the second codebook index is uniquely determined by the value and/or the value range of the first codebook index corresponding to the first PMI.
- the value range of the first codebook index corresponding to the first PMI is associated with the value range of the second codebook I corresponding to the second PMI, including
- the value range of the first codebook index corresponding to the first PMI includes at least two first value sets that are different from each other, and the value range of the second codebook index corresponding to the second PMI includes an element.
- the at least two second set of values that are different from each other have a corresponding relationship with the at least two second set of values.
- the number of first set of values is equal to the number of sets of second values. It should also be understood that the elements in the first set of values are different from each other, and the elements in the second set of values are also different from each other.
- the value range of the first codebook index corresponding to the first PMI is related to the value range of the second codebook corresponding to the second PMI.
- the value range of the first codebook index corresponding to the first PMI includes at least two first value sets that are different from each other, and the value range of the second codebook index corresponding to the second PMI includes The at least two second set of values that are different from each other have a corresponding relationship with the at least two second set of values.
- first set of values is equal to the number of sets of second values. It should also be understood that the elements in the first set of values are different from each other, and the elements in the second set of values are also different from each other.
- each of the at least two first value sets includes at least two values
- each of the at least two second value sets includes at least two Value
- the transmission precoding of the embodiment of the present invention is related to the value range of the first codebook index corresponding to the first PMI and the value range of the second codebook index corresponding to the second PMI.
- the matrix method can indicate more precoding matrices suitable for uniform linear array antennas without changing the feedback mode and feedback bits, and can ensure that the performance applied to the dual polarized antenna is not affected, thereby improving the system. Performance and enhance the user experience.
- the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second PMI corresponding to the second PMI is determined by the table Cl, C2, C3 or C4:
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention has an association relationship between the value range of the first codebook index corresponding to the first PMI and the value range of the second codebook index corresponding to the second PMI. It is possible to indicate more precoding matrices suitable for a uniform linear array antenna in the case of performing codebook downsampling without changing the feedback mode and feedback bits, and each precoding matrix in the downsampled codebook set is It can be applied to dual-polarized antennas, thus ensuring that it does not affect the performance of dual-polarized antennas, and can improve system performance and enhance user experience.
- FIG. 5 illustrates another schematic flow diagram of a method 70 of transmitting a four antenna precoding matrix, which may be performed, for example, by a base station, in accordance with an embodiment of the present invention. As shown in FIG. 5, the method 70 includes:
- the value of the first codebook index corresponds to a precoding matrix set in the codebook set, where the codebook set corresponds to the rank, and the codebook set includes a precoding matrix by the first codebook index and the second
- a first codebook bow I corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0 , 1 , 2, 3 , 4, 5, 6, 7 ⁇ , ⁇ 8, 9, 10 , 11 , 12, 13, 14, 15 ⁇ , ⁇ 0, 2, 4, 6 ⁇ , ⁇ 1 , 3, 5, 7 ⁇ , ⁇ 8, 10, 12, 14 ⁇ or ⁇ 9, 11 , 13, 15 ⁇ .
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix, thereby improving system performance and enhancing user experience.
- ⁇ ⁇ 6 ⁇ ⁇ (, ⁇ ) 2 - 3 ⁇ 4, when ⁇ too, ⁇ ⁇ ) is ⁇ (1), when the last Upsilon, ⁇ ⁇ ) is ⁇ (2), when ⁇ ⁇ ⁇ 111 ⁇ 6 3 , is ⁇ (3), when ⁇ is, it is ⁇ (4); e, indicating a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are 0, and ie ⁇ l , 2, 3, 4 ⁇ ; A is a constant.
- the correspondence between the joint code value and the rank and the first codebook index is determined by the following list D:
- / ⁇ represents the joint coded value
- RI represents the rank
- the first codebook index is in the embodiment of the present invention, optionally, when the number of bits carrying the joint coded value is three, the joint code
- m and k are non-negative integers; represent the first codebook index; ⁇ ⁇ 2 represents the second codebook index.
- the precoding matrix W included in the codebook set is determined by the table B1 or ⁇ 2:
- w (1) ⁇ 1 e 1 ee jnkl2 , mm'm' m , k ⁇ P k v m - —( k v m
- k is a non-negative integer; ⁇ ; represents the first codebook index; , 2 represents the second codebook index
- the joint coding value represents a value for jointly coding the rank and the first PMI, and is not described herein again for brevity.
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix, thereby improving system performance and enhancing user experience.
- Figure 6 shows yet another schematic flow diagram of a method 80 of transmitting a four-antenna precoding matrix, which may be performed, for example, by a base station, in accordance with an embodiment of the present invention.
- the method 80 includes:
- the second codebook index indicates that the second PMI has a first correspondence with the second codebook index, and for one a given first codebook index, where the value range of the second codebook index corresponding to the value range of the second PMI is a true subset of the value range of the second codebook index,
- the precoding matrix W included in the codebook set satisfies an equation:
- a first codebook index corresponds to a value of ⁇ , and the value range of the ⁇ is a set ⁇ 0,
- the first codebook index corresponds to the precoding matrix set determined by the first codebook index and the second codebook index corresponding to the second ⁇ value range.
- the first precoding matrix set is indexed with the first codebook. +8 corresponds to the second precoding matrix set mutually exclusive, wherein the first codebook index / L. Representing a first codebook index corresponding to n of the value a, the first codebook index +S indicating a first codebook index corresponding to n having a value of a+8, ae ⁇ 0, 1,
- the method for transmitting the four-antenna precoding matrix in the embodiment of the present invention can avoid the problem of duplication of the pre-coded pre-coding matrix, thereby improving system performance and enhancing user experience.
- a first codebook index 3 ⁇ 4 ranges 0 ⁇ 3 ⁇ 4; ⁇ 15, second codebook index in the range of 2 wherein is a positive integer, for example, the ⁇
- the value ranges from 1 ⁇ L 2 ⁇ 15 , that is, the value range of the second codebook index i 2 is , for example, 0 ⁇ 2 ⁇ 15.
- W 2 satisfies the equation:
- ⁇ e , ⁇ (, ⁇ ) 2 - 3 ⁇ 4 , when ⁇ is, ⁇ (, ⁇ ) is ⁇ (1), when ⁇ is e 2 , ct( ) is ⁇ (2), when ⁇ is When ⁇ (0 is ⁇ (3), when ⁇ is, ⁇ ') is ⁇ (4); e, indicating a column vector with a dimension of 4x1, the i-th element in the is 1, and the remaining elements are 0. , and i 2, 3, 4 ⁇ ; A is a constant.
- W 2 satisfies the equation:
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EP17167095.3A EP3264627B1 (en) | 2013-06-04 | 2013-06-04 | Method for transmitting 4-antenna precoding matrix, user equipment and base station |
CN201380001850.7A CN104521165B (zh) | 2013-06-04 | 2013-06-04 | 传输四天线预编码矩阵的方法、用户设备和基站 |
EP13886384.0A EP2985942B1 (en) | 2013-06-04 | 2013-06-04 | Method, user equipment and base station for transmitting four-antenna pre-coding matrix |
PCT/CN2013/076735 WO2014194479A1 (zh) | 2013-06-04 | 2013-06-04 | 传输四天线预编码矩阵的方法、用户设备和基站 |
RU2015155888A RU2615680C1 (ru) | 2013-06-04 | 2013-06-04 | Способ передачи матрицы предварительного кодирования для 4 антенн, пользовательское оборудование и базовая станция |
JP2016517109A JP6235704B2 (ja) | 2013-06-04 | 2013-06-04 | 4アンテナプリコーディングマトリックスを送信するための方法、ユーザ機器、および基地局 |
BR112015029739-0A BR112015029739B1 (pt) | 2013-06-04 | 2013-06-04 | Método para transmitir matriz de pré-codificação de 4 antenas, equipamento de usuário e estação base |
MX2015016226A MX350673B (es) | 2013-06-04 | 2013-06-04 | Método para transmitir una matriz de precodificación de cuatro antenas, equipo de usuario y estación base. |
KR1020157034509A KR101762526B1 (ko) | 2013-06-04 | 2013-06-04 | 4-안테나 프리코딩 행렬을 전송하기 위한 방법, 사용자 장비 및 기지국 |
ARP140102184A AR096523A1 (es) | 2013-06-04 | 2014-06-04 | Método para transmitir una matriz de precodificación de 4 antenas, un equipo de usuario y una estación de base |
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US14/960,100 US9531460B2 (en) | 2013-06-04 | 2015-12-04 | Method for transmitting 4-antenna precoding matrix, user equipment and base station |
US15/371,840 US9843366B1 (en) | 2013-06-04 | 2016-12-07 | Method for transmitting 4-antenna precoding matrix, user equipment and base station |
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US20180309486A1 (en) * | 2015-12-29 | 2018-10-25 | Huawei Technologies Co., Ltd. | Precoding matrix determining method and apparatus |
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CN109495149B (zh) * | 2017-09-11 | 2021-10-15 | 华为技术有限公司 | 通信方法、网络设备、终端设备和*** |
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KR101806091B1 (ko) | 2017-12-06 |
MX350673B (es) | 2017-09-13 |
RU2615680C1 (ru) | 2017-04-06 |
US9843366B1 (en) | 2017-12-12 |
AR096524A1 (es) | 2016-01-13 |
BR112015029739A2 (pt) | 2017-07-25 |
US9531460B2 (en) | 2016-12-27 |
JP2016526353A (ja) | 2016-09-01 |
KR20170069296A (ko) | 2017-06-20 |
MX2015016226A (es) | 2016-03-01 |
KR101762526B1 (ko) | 2017-07-27 |
KR20160010489A (ko) | 2016-01-27 |
CN104521165A (zh) | 2015-04-15 |
CN104521165B (zh) | 2018-05-18 |
BR112015029739B1 (pt) | 2022-08-23 |
EP2985942A1 (en) | 2016-02-17 |
JP6235704B2 (ja) | 2017-11-22 |
EP3264627B1 (en) | 2019-11-06 |
US20160087701A1 (en) | 2016-03-24 |
US20170338868A1 (en) | 2017-11-23 |
AR096523A1 (es) | 2016-01-13 |
EP3264627A1 (en) | 2018-01-03 |
EP2985942A4 (en) | 2016-05-11 |
EP2985942B1 (en) | 2017-08-09 |
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