JP6541190B2 - Method for transmitting a 4-antenna precoding matrix, user equipment and base station - Google Patents

Description

  The present invention relates to the field of communications, and in particular to a method, user equipment and base station for transmitting a four antenna precoding matrix in the field of communications.

Multiple Input Multiple Output (abbreviated "MIMO") wireless systems transmit beamforming (BeamForming for short "BF") / precoding and receive a combination of signals to achieve diversity and array Gain can be obtained. The signal vector received by a typical system using BF or precoding is given by
y = HVs + n (1)
And y represents the received signal vector, H represents the channel matrix, V represents the precoding matrix, s represents the transmitted symbol vector, and n is the measured Represents noise.

  Optimal precoding generally requires the transmitter to be fully aware of Channel State Information ("CSI" for short). A common method is for the user equipment (User Equipment, abbreviated "UE") to quantize the instantaneous CSI and feed back the CSI to an evolved Node B (evolved NodeB, abbreviated "eNB"). In Release 8 (R8) of the existing Long Term Evolution (abbreviated "LTE") system, the CSI information fed back by the UE is a Rank Indicator (abbreviated "RI"), precoding matrix Information such as an indicator (Precoding Matrix Indicator, "PMI" for short) and a Channel Quality Indicator (CQI for short) may be included, and RI and PMI may be the number of layers used and pre 2 shows a coding matrix. The LTE R8 codebook is mainly designed for single-user MIMO (Single-User MIMO, abbreviated as "SU-MIMO"), and the precoding matrix or codewords are eight-phase shift keying (8 Phase Shift Keying). , Abbreviated "8 PSK"), which limits the spatial quantization accuracy. This leads to severe limitations on the performance of spatial quantization accuracy sensitive transmission schemes, such as Multiple User MIMO ("MU-MIMO" for short).

  In order to meet higher system requirements, the 3rd Generation Partnership Project (3rd Generation Partnership Project, abbreviated "3GPP") LTE system needs to further improve the performance of MU-MIMO, and in addition, coordinated multipoint (Coordinated) Multi-Point (abbreviated "CoMP") transmission technology is further introduced into the system. Currently, CoMP technology is based on single cell feedback, so both of the above two technologies result in higher requirements for feedback performance. Because the capacity of the feedback channel is limited, the size of the codebook set is also limited, which results in higher requirements for codebook design.

  The 3GPP LTE R8 system uses a single codebook, and the precoding matrix is indicated by RI and PMI. The correspondence between codewords in RI, PMI, and codebook for a 4-antenna system is shown in Table 1 below.

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスであり、u_nは、上記表1において与えられる。 here,

Is the matrix

Denoting the matrix formed by the set of columns {s} of I, I is a 4 × 4 identification matrix, and u _n is given in Table 1 above.

（2）において示された形態を有し、
Nおよびmは、整数であり、N=2^xであり、xは、負でない整数であり、すなわち、Nは、xの累乗に累乗された2であり、DFTベクトルvのt番目の要素は、

（t=1, 2, …, T）である。 In the codebook of the R8 system, for a precoding matrix whose rank (Rank) is 1, the precoding matrix whose index is 0 to 7 is a Discrete Fourier Transform (abbreviated "DFT") vector Yes, DFT vectors are applicable to Uniform Linear Array ("ULA" for short) antennas. The DFT vector represents a T × 1 precoding matrix, and the DFT vector v is generally

It has the form shown in (2),
N and m are integers, N = 2 ^x , and x is a non-negative integer, ie, N is 2 raised to the power of x, and the t th element of the DFT vector v is ,

(T = 1, 2, ..., T).

（3）によって表される。 In Release 10 (R10) of the 3GPP LTE system, the codebook used by the 8-antenna system is formed by two groups of DFT vectors v _m and two groups of DFT vectors have a phase difference φ _n , The DFT vector v _m and the phase difference are given by the following equation (3),

It is represented by (3).

  The following provides a codebook structure for an eight antenna system. The codebook structure is designed for dual polarization antennas. Table 2 shows an 8-antenna codebook where the rank is 1 (ie, the number of transmission layers is 1 layer), and Table 3 shows a rank of 2 (ie, 2 layers of transmission layers). Table 4 shows an 8-antenna codebook in the case where the rank is 3 (ie, the number of transmission layers is 3 layers), and Table 5 shows a rank 4 (Ie, the number of transmission layers is four), and the eight antenna codebook is shown.

The index of the eight antenna precoding matrix may be represented by a _first codebook index i ₁ and a second codebook index i ₂ , and for an eight antenna codebook whose rank is 1, the first codebook index i _{Both the 1} and the second codebook index i ₂ need to be represented by 4 bits. PMI may be represented by 4 bits to save feedback resource overhead. This requires that subsampling be performed on the PMI or 8-antenna codebook, and in the 8-antenna system Physical Uplink Control Channel (abbreviated "PUCCH") mode 1-1 sub The sampling codebook in mode 2 is shown in Table 6.

For enhanced 4 antenna codebook, to improve system performance without increasing the complexity of codebook design and feedback, codebook structure design solution of 8 antenna system can be used, and the index of precoding matrix is also It may be represented by the first codebook index i ₁ and the second codebook index i _2. To save feedback resource overhead, PMI may also be represented by 4 bits, which also requires that subsampling be performed for PMI or 4 antenna codebooks.

  However, for the latest 4-antenna codebook used by the 3GPP LTE system, if the mode is PUCCH mode 1-1, sub-mode 2, then the sub-sampling is shown in Table 6 when the rank is 1 in Table 6. After being performed on the codebook according to the subsampling table, the precoding matrix has only two DFT vectors. However, the four antenna codebook of the R8 system has eight DFT vectors. Thus, if the configured antenna is a uniform linear array ULA antenna, the precoding matrix applicable to the ULA antenna for the enhanced 4 antenna codebook in submode 2 of PUCCH mode 1-1 is the precoding matrix of the R8 system Deterioration of performance is serious because it is less than that.

  Embodiments of the present invention provide a method, user equipment, and base station for transmitting a four antenna precoding matrix, which can be applied to a uniform linear array antenna without changing the feedback mode or feedback bits More precoding matrices can be shown.

および

n=0, 1, …, 15であり、
であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 A first aspect provides a method for transmitting a four antenna precoding matrix, the method comprising: determining a rank used to indicate the number of transmission layers; and a codebook corresponding to the rank Determining a first precoding matrix in the set, wherein the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index And determining a first precoding matrix indicator PMI and a second PMI used to indicate the first precoding matrix, the first PMI and the first codebook The index has a first correspondence, the second PMI and the second codebook Determining having a second correspondence, sending to the base station the first PMI and the second PMI used to indicate the first precoding matrix. And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

and

n = 0, 1, ..., 15, and
And
The first codebook index corresponds to one value of n, and the range of values of n is 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} .

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the first aspect, in the first possible realization manner of the first aspect, when it is determined that the rank is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the first aspect, in the second possible realization manner of the first aspect, when it is determined that the rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 Regarding the first aspect, in a third possible implementation manner of the first aspect, the precoding matrix set corresponding to the first codebook index corresponding to the first PMI comprises precoding matrices U1 and U2 And said precoding matrices U1 and U2 are indicated by said second codebook index,

And A is a constant.

  Regarding the first possible realization manner of the first aspect, in the fourth possible realization manner of the first aspect, the precoding included in the codebook set when the rank is determined to be 1. The matrix W is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding the second possible realization manner of the first aspect, in the fifth possible realization manner of the first aspect, when the rank is determined to be 2, the precoding included in the codebook set The matrix W is determined according to Table B1 or B2

であり、m、m'、およびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

, M, m ′ and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding possible realization manners of the first aspect or any of the first to fifth possible realization manners of the first aspect, in the sixth possible realization manner of the first aspect, the rank is 1 And the first codebook index corresponding to the first PMI, the second PMI, the first PMI, and the second codebook index corresponding to the second PMI. Is determined according to Table C1, C2, C3 or C4,

I _PMI1 represents the first PMI, I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. Represent.

  Regarding possible realization manners of the first aspect or any of the first to fifth possible realization manners of the first aspect, in the seventh possible realization manner of the first aspect, the rank is 2 , The range of said values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14, 15} It can be.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 The second aspect provides a method for transmitting a four-antenna precoding matrix, which comprises: determining a rank used to indicate the number of transmission layers; and one pre-codebook set. Determining a value of a first codebook index corresponding to a coding matrix set, wherein the codebook set corresponds to the rank, and a precoding matrix included in the codebook set is the first codebook set. Determining, represented by a codebook index and a second codebook index, and determining a joint coded value corresponding to the rank and the value of the first codebook index, , Said joint coded value and said The rank has a first correspondence, the joint coding value and the first codebook index have a second correspondence, determining, and transmitting the joint coded value to the base station And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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, 13 15}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the second aspect, in the first possible realization manner of the second aspect, when it is determined that the rank is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the second aspect, in the second possible realization manner of the second aspect, when it is determined that the rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  Regarding the possible realization manner of the second aspect or any of the first to second possible realization manners of the second aspect, the joint-coded values in the third possible realization manner of the second aspect The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table D of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

  The joint-coded values in the fourth possible realization manner of the second aspect, regarding the possible realization manner of the second aspect or any one of the first to second possible realization manners of the second aspect, in the fourth possible realization manner of the second aspect The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table E of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
前記ランクが2であると決定された場合、前記第1のコードブックインデックスと前記第2のPMIの前記値の範囲に対応する前記第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、前記第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、前記第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 A third aspect provides a method for transmitting a four antenna precoding matrix, the method comprising: determining a rank used to indicate the number of transmission layers; and a codebook corresponding to the rank Determining a first precoding matrix in the set, wherein the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index And determining a second precoding matrix indicator PMI used to indicate the first precoding matrix, the second PMI and the second codebook index being a first Have a correspondence, in one given first codebook index Determining the range of values of the second codebook index corresponding to the range of values of the second PMI is a suitable subset of the range of values of the second codebook index; Sending to the base station the second PMI used to indicate the first precoding matrix, wherein the precoding matrix W included in the codebook set has the following formula: Meet W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
A precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI if the rank is determined to be 2. In the first codebook index

First precoding matrix set and first codebook index corresponding to

The second precoding matrix set corresponding to is mutually exclusive and said first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the third aspect, in the first possible realization manner of the third aspect, when it is determined that the rank is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the third aspect, in the second possible realization manner of the third aspect, when it is determined that the rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  Regarding possible realization manners of the third aspect or any of the first to second possible realization manners of the third aspect, in the third possible realization manner of the third aspect, the rank is 2 If it is determined that the interrelationship between the second PMI, the first codebook index, and the second codebook index is determined according to Table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

The possible realization manner of the third aspect or any of the first to second possible realization manners of the third aspect, wherein the rank is 3 or 4 in the fourth possible realization manner of the third aspect. If it is determined that the precoding matrix included in the codebook set corresponding to the rank is
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 A fourth aspect provides a method for transmitting a four antenna precoding matrix, the method comprising: a rank used to indicate the number of transmission layers sent by a user equipment, a first precoding Receiving a matrix indicator PMI and a second PMI, and determining a first precoding matrix in a codebook set corresponding to the rank according to the first PMI and the second PMI. The precoding matrix included in the codebook set is represented by a first codebook index and a second codebook index, and the first PMI and the first codebook index are first Have a correspondence, and the second PMI and the second codebook index have a second correspondence And determining the precoding matrix W contained in the codebook set, satisfies the following equation, the W = W ₁ × W _2,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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} .

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the fourth aspect, in the first possible realization manner of the fourth aspect, if the received rank is 1, then W ₂ has the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the fourth aspect, in the second possible realization manner of the fourth aspect, when the received rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 In relation to the fourth aspect, in a third possible implementation manner of the fourth aspect, the precoding matrix set corresponding to the first codebook index corresponding to the first PMI comprises precoding matrices U1 and U2 And said precoding matrices U1 and U2 are indicated by said second codebook index,

And A is a constant.

  Regarding the first possible implementation manner of the fourth aspect, in the fourth possible implementation manner of the fourth aspect, when the received rank is 1, the precoding matrix included in the codebook set W is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding the second possible realization manner of the fourth aspect, in the fifth possible realization manner of the fourth aspect, when the received rank is 2, the precoding matrix included in the codebook set W is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

, M, m ′ and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding possible realization manners of any of the first to fifth possible realization manners of the fourth aspect or the fourth aspect, in the sixth possible realization manner of the fourth aspect, the received rank is When it 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 , According to Table C1, C2, C3 or C4,

I _PMI1 represents the first PMI, I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. Represent.

  Regarding possible realization manners of any of the first to fifth possible realization manners of the fourth aspect or the fourth aspect, in the seventh possible realization manner of the fourth aspect, the received rank is If 2, then the range of said values of n is the set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14, 15} possible.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 A fifth aspect provides a method for transmitting a four antenna precoding matrix, the method comprising the steps of: receiving a joint coded value sent by a user equipment; and in response to the joint coded value. A first codebook index value and a rank used to indicate the number of transmission layers, a correspondence between the joint coded value and the rank, the joint coded value and the first And determining a correspondence between the codebook index and the codebook index, wherein the value of the first codebook index corresponds to one precoding matrix set in the codebook set, and the codebook set is A program corresponding to the rank and included in the codebook set Coding matrix, the first codebook index and is represented by the second codebook index, the precoding matrix W contained in the codebook set, satisfies the following equation, the W = W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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, 13 15}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the fifth aspect, in the first possible realization manner of the fifth aspect, when it is determined that the rank is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the fifth aspect, in the second possible realization manner of the fifth aspect, when it is determined that the rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  The joint-coded values in the third possible realization manner of the fifth aspect, regarding the possible realization manners of any of the first to second possible realization manners of the fifth aspect or the fifth aspect The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table D of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

  Regarding the possible realization manner of any of the first to second possible realization manners of the fifth aspect or the fifth aspect, in the fourth possible realization manner of the fifth aspect, the joint-coded values The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table E of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
前記受信されたランクが2である場合、前記第1のコードブックインデックスと前記第2のPMIの前記値の範囲に対応する前記第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、前記第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、前記第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 A sixth aspect provides a method for transmitting a four antenna precoding matrix, the method comprising: transmitting a second precoding matrix indicator PMI, a first codebook index, and a transmission layer sent by a user equipment Determining a first precoding matrix in a codebook set corresponding to the rank according to the second PMI and the first codebook index, receiving a rank used to indicate the number of The precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and the second PMI and the second codebook index are , Has a first correspondence, and one given first code Determining, for a book index, the range of values of the second codebook index corresponding to the range of values of the second PMI is a suitable subset of the range of values of the second codebook index And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the received rank is 2, then in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. , The first codebook index

First precoding matrix set and first codebook index corresponding to

The second precoding matrix set corresponding to is mutually exclusive and said first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the sixth aspect, in the first possible realization manner of the sixth aspect, if the received rank is 1, then W ₂ has the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the sixth aspect, in the second possible realization manner of the sixth aspect, when the received rank is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  Regarding possible realization manners of the sixth aspect or any of the first to second possible realization manners of the sixth aspect, in the third possible realization manner of the sixth aspect, the received rank is If 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is determined according to Table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

Regarding possible realization manners of the sixth aspect or any of the first to second possible realization manners of the sixth aspect, in the fourth possible realization manner of the sixth aspect, the received rank is When it is 3 or 4, the precoding matrix included in the codebook set corresponding to the rank is:
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 A seventh aspect provides a user equipment, wherein the user equipment is configured to determine a rank to be used to indicate the number of transmission layers, and wherein a first precode in a codebook set corresponding to the rank is provided. A precoding matrix further configured to determine a coding matrix, the precoding matrix included in the codebook set being represented by a first codebook index and a second codebook index, indicating the first precoding matrix Are further configured to determine a first precoding matrix indicator PMI and a second PMI to be used for, the first PMI and the first codebook index having a first correspondence The determining module, wherein the second PMI and the second codebook index have a second correspondence And a sending module used to indicate the first precoding matrix and configured to send the first PMI determined by the determining module and the second PMI to a base station. And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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} .

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the seventh aspect, in the first possible realization manner of the seventh aspect, when the rank determined by the determination module is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the seventh aspect, in the second possible realization manner of the seventh aspect, when the rank determined by the determination module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 In relation to the seventh aspect, in the third possible implementation manner of the seventh aspect, the precoding matrix set corresponding to the first codebook index corresponding to the first PMI comprises precoding matrices U1 and U2 And said precoding matrices U1 and U2 are indicated by said second codebook index,

And A is a constant.

  Regarding the first possible implementation manner of the seventh aspect, in the fourth possible implementation manner of the seventh aspect, the codebook set is included if the rank determined by the determination module is 1. The precoding matrix W is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding the second possible implementation manner of the seventh aspect, in the fifth possible implementation manner of the seventh aspect, when the rank determined by the determination module is 2, it is included in the codebook set The precoding matrix W is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

, M, m ′ and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding the possible realization manner of any one of the first to fifth possible realization manners of the seventh aspect or the seventh aspect, in the sixth possible realization manner of the seventh aspect, determined by the determination module If the rank is 1, the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second corresponding to the second PMI The codebook index is determined according to table C1, C2, C3 or C4,

I _PMI1 represents the first PMI, I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. Represent.

  Regarding the possible realization manner of the seventh aspect or any one of the first to fifth possible realization manners of the seventh aspect, in the seventh possible realization manner of the seventh aspect, determined by the determination module If the rank is 2 then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14 , 15}.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である、ユーザ機器。 An eighth aspect provides a user equipment, which is configured to determine a rank used to indicate the number of transmission layers, corresponding to one precoding matrix set in a codebook set The codebook set is further configured to determine a value of a first codebook index, wherein the codebook set corresponds to the rank, and a precoding matrix included in the codebook set is the first codebook index and the first codebook index. A codebook index of 2 and further configured to determine a joint-coded value corresponding to the rank and the value of the first codebook index, the joint-coded value and the rank Has a first correspondence, said joint chordin A determination module having a second correspondence, and a transmission configured to send to the base station the joint-coded value determined by the determination module and the first codebook index having a second correspondence And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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, 13 15}, user equipment.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the eighth aspect, in the first possible realization manner of the eighth aspect, when the rank determined by the determination module is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the eighth aspect, in the second possible realization manner of the eighth aspect, when the rank determined by the determination module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  The joint-coded values in the third possible realization manner of the eighth aspect according to a possible realization manner of the eighth aspect or any of the first to second possible realization manners of the eighth aspect. The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table D of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

  The joint-coded values in the fourth possible realization manner of the eighth aspect according to a possible realization manner of the eighth aspect or any of the first through second possible realization manners of the eighth aspect. The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table E of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
前記決定モジュールによって決定された前記ランクが2である場合、前記第1のコードブックインデックスと前記第2のPMIの前記値の範囲に対応する前記第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、前記第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、前記第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 A ninth aspect provides a user equipment, wherein the user equipment is configured to determine a rank to be used to indicate the number of transmission layers, and wherein a first precode in a codebook set corresponding to the rank is provided. A precoding matrix further configured to determine a coding matrix, the precoding matrix included in the codebook set being represented by a first codebook index and a second codebook index, indicating the first precoding matrix Further configured to determine a second precoding matrix indicator PMI to be used for, the second PMI and the second codebook index having a first correspondence, one given The second code corresponding to the second PMI value range for the first codebook index A range of values of the book index is used to indicate a decision module, which is a suitable subset of the range of values of the second codebook index, and the first precoding matrix, which is determined by the decision module And a transmission module configured to transmit the second PMI to the base station, and the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the rank determined by the determination module is 2, then the pre-determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. First codebook index in the coding matrix set

First precoding matrix set and first codebook index corresponding to

The second precoding matrix set corresponding to is mutually exclusive and said first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the ninth aspect, in the first possible realization manner of the ninth aspect, when the rank determined by the determination module is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the ninth aspect, in the second possible realization manner of the ninth aspect, when the rank determined by the determination module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  Regarding the possible realization manner of the ninth aspect or any of the first to second possible realization manners of the ninth aspect, in the third possible realization manner of the ninth aspect, determined by the determination module If the rank is 2 then the correlation between the second PMI, the first codebook index, and the second codebook index is determined according to table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

Regarding the possible realization manner of the ninth aspect or any of the first to second possible realization manners of the ninth aspect, in the fourth possible realization manner of the ninth aspect, determined by the determination module If the rank is 3 or 4, the precoding matrix included in the codebook set corresponding to the rank is
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 A tenth aspect provides a base station, which is used by the user equipment to indicate the number of transmission layers, a rank, a first precoding matrix indicator PMI, and a second. A codebook set corresponding to the rank received by the receiving module according to a receiving module configured to receive a PMI, and the first PMI and the second PMI received by the receiving module The precoding matrix, which is configured to determine a first precoding matrix in H, and included in the codebook set, is represented by a first codebook index and a second codebook index, and the first PMI is And the first codebook index have a first correspondence, the second PMI and the second Codebook index has a second corresponding, and a decision module, the precoding matrix W contained in the codebook set, satisfies the following equation, the W = W ₁ × W _2,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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} .

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 For the tenth aspect, in the first possible implementation manner of the tenth aspect, if the rank received by the receiving module is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the tenth aspect, in the second possible realization manner of the tenth aspect, if the rank received by the receiving module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 In relation to the tenth aspect, in the third possible implementation manner of the tenth aspect, the precoding matrix set corresponding to the first codebook index corresponding to the first PMI comprises precoding matrices U1 and U2 And said precoding matrices U1 and U2 are indicated by said second codebook index,

And A is a constant.

  The first possible implementation manner of the tenth aspect is, in the fourth possible implementation manner of the tenth aspect, included in the codebook set if the rank received by the receiving module is one. The precoding matrix W is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  The second possible implementation manner of the tenth aspect is, in the fifth possible implementation manner of the tenth aspect, included in the codebook set if the rank received by the reception module is 2. The precoding matrix W is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、前記第1のコードブックインデックスを表し、i₂は、前記第2のコードブックインデックスを表す。

, M, m ′ and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Regarding possible realization manners of any of the first to fifth possible realization manners of the tenth aspect or the tenth aspect, in the sixth possible realization manner of the tenth aspect, received by the receiving module If the rank is 1, the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second corresponding to the second PMI The codebook index is determined according to table C1, C2, C3 or C4,

I _PMI1 represents the first PMI, I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. Represent.

  Regarding possible realization manners of any of the first to fifth possible realization manners of the tenth aspect or the tenth aspect, in the seventh possible realization manner of the tenth aspect, received by the receiving module If the rank is 2 then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14 , 15}.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 An eleventh aspect provides a base station, the base station configured to receive a joint coded value sent by a user equipment, and the joint coding received by the receiver module. The value of the first codebook index according to the calculated value, the rank used to indicate the number of transmission layers, the correspondence between the joint coded value and the rank, and the joint coded A determination module configured to determine a value and a correspondence between said first codebook index, said value of said first codebook index being one precoding in a codebook set Corresponding to a matrix set, the codebook set corresponds to the rank, The precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and the precoding matrix W included in the codebook set is expressed by the following equation: W Satisfy = W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, and the range of values of n is 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, 13 15}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the eleventh aspect, in the first possible realization manner of the eleventh aspect, when the rank determined by the determination module is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the eleventh aspect, in the second possible realization manner of the eleventh aspect, when the rank determined by the determination module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  The joint-coded values in a third possible realization manner of the eleventh aspect, relating to a possible realization manner of any one of the first to second possible realization manners of the eleventh aspect or the eleventh aspect. The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table D of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

  The joint-coded values in a fourth possible realization manner of the eleventh aspect, relating to a possible realization manner of any of the first to second possible realization manners of the eleventh aspect or the eleventh aspect. The correspondence between the joint coded value and the rank and the correspondence between the joint coded value and the first codebook index are: Determined according to Table E of

I _{RI / PMI 1} represents the joint coded values, RI represents the rank, i ₁ denotes the first codebook index.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
前記受信されたランクが2である場合、前記第1のコードブックインデックスと前記第2のPMIの前記値の範囲に対応する前記第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、前記第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、前記第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 A twelfth aspect provides a base station, which base station is used to indicate the number of second precoding matrix indicator PMI sent by the user equipment, the first codebook index, and the transmission layer. A receiving module configured to receive a rank, and the second PMI received by the receiving module and the first codebook index corresponding to the rank received by the receiving module A precoding matrix configured to determine a first precoding matrix in a codebook set and included in the codebook set is represented by the first codebook index and a second codebook index, A second PMI and the second codebook index Has a first correspondence, and for one given first codebook index, the second codebook index value range corresponding to the second PMI value range is: A decision module, which is a suitable subset of the range of values of the second codebook index, and the precoding matrix W included in the codebook set satisfies the following formula: W = W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the received rank is 2, then in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. , The first codebook index

First precoding matrix set and first codebook index corresponding to

The second precoding matrix set corresponding to is mutually exclusive and said first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 Regarding the twelfth aspect, in the first possible realization manner of the twelfth aspect, when the rank received by the receiving module is 1, W ₂ is the following formula:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 Regarding the twelfth aspect, in the second possible realization manner of the twelfth aspect, when the rank received by the receiving module is 2, W ₂ is the following formula:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  Regarding possible realization manners of any of the first to second possible realization manners of the twelfth aspect or the twelfth aspect, in the third possible realization manner of the twelfth aspect, received by the receiving module If the rank is 2 then the correlation between the second PMI, the first codebook index, and the second codebook index is determined according to table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

Regarding possible realization manners of any of the first to second possible realization manners of the twelfth aspect or the twelfth aspect, in the fourth possible realization manner of the twelfth aspect, received by the receiving module If the rank is 3 or 4, the precoding matrix included in the codebook set corresponding to the rank is
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

  Based on the above technical solution, the method for transmitting a 4-antenna precoding matrix according to an embodiment of the present invention, a user equipment, and more base stations applicable to a uniform linear array antenna by a base station are available. System performance can be improved since the feedback mode or feedback bit can be indicated without changing, and it can be guaranteed that the performance for polarization sharing antenna applications is not affected, so the user experience can be improved. It can be improved.

  BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments of the present invention. Apparently, the attached drawings in the following description merely show some embodiments of the present invention, and those skilled in the art can further derive other drawings from these attached drawings without creative efforts. it can.

5 is a schematic flowchart of a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention. 5 is another schematic flowchart of a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention. 7 is yet another schematic flowchart of a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention. 7 is a schematic flowchart of a method for transmitting a four antenna precoding matrix according to another embodiment of the present invention. 7 is another schematic flowchart of a method for transmitting a four antenna precoding matrix according to another embodiment of the present invention. 7 is yet another schematic flowchart of a method for transmitting a four antenna precoding matrix according to another embodiment of the present invention. FIG. 5 is a schematic block diagram of user equipment according to an embodiment of the present invention. FIG. 6 is another schematic block diagram of user equipment according to an embodiment of the present invention. FIG. 7 is yet another schematic block diagram of user equipment according to an embodiment of the present invention. FIG. 2 is a schematic block diagram of a base station according to an embodiment of the present invention. FIG. 5 is another schematic block diagram of a base station according to an embodiment of the present invention. FIG. 7 is yet another schematic block diagram of a base station according to an embodiment of the present invention. FIG. 7 is a schematic block diagram of user equipment according to another embodiment of the present invention; FIG. 7 is another schematic block diagram of user equipment according to another embodiment of the present invention. FIG. 10 is yet another schematic block diagram of user equipment according to another embodiment of the present invention; FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention. FIG. 7 is another schematic block diagram of a base station according to another embodiment of the present invention. FIG. 10 is yet another schematic block diagram of a base station according to another embodiment of the present invention.

  The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person skilled in the art without creative effort based on the embodiments of the present invention shall fall within the protection scope of the present invention.

  The technical solution of the embodiment of the present invention is a Global System of Mobile communication (abbreviated "GSM (registered trademark)") system for mobile communication, Code Division Multiple Access (abbreviated "CDMA." )) System, Wideband Code Division Multiple Access (abbreviated “WCDMA (registered trademark)”) system, General Packet Radio Service (abbreviated “GPRS”), Long Term Evolution (abbreviated “GPRS”) Long Term Evolution (abbreviated “LTE”) system, LTE Frequency Division Duplex (abbreviated “FDD”) system, LTE Time Division Duplex (abbreviated “TDD”), universal mobile electricity Communication system (Universal Mobile Telecommunication System, abbreviated as “UMTS”), World Wide Interoperability for Micro Ebuakusesu (Worldwide Interoperability for Microwave Access, abbreviated "WiMAX") communication system, such as equal, it should be capable of being applied to various communication systems are understood.

  In the embodiment of the present invention, user equipment (User Equipment, abbreviated as "UE") refers to a terminal (Terminal), a mobile station (Mobile Station, abbreviated as "MS"), a mobile terminal (Mobile Terminal), etc. It should also be understood that it can be said. A user equipment may communicate with one or more core networks by means of a Radio Access Network (abbreviated "RAN"). For example, the user equipment may be a mobile phone (also called a "cellular" phone) or a computer with a mobile terminal. For example, the user equipment may also be a portable, pocket-sized, hand-held, computer-embedded, or mobile, mobile device that exchanges voice and / or data with a wireless access network.

  In the embodiment of the present invention, the base station may be a base station in GSM or CDMA (Base Transceiver Station, abbreviated as "BTS"), or may be a node B (NodeB, abbreviated as "NB" in WCDMA) Or may be an evolved Node B (abbreviated "eNB" or "e-Node B") in LTE, but this is not limited in the present invention. However, for ease of explanation, the following embodiments are described using eNB as an example.

  FIG. 1 shows a schematic flow chart of a method 10 for transmitting a four antenna precoding matrix according to an embodiment of the present invention. Method 10 may be performed by, for example, user equipment. As shown in FIG. 1, method 10 includes the following.

  S11. Determine the rank used to indicate the number of transmission layers.

  S12. A first precoding matrix in the codebook set corresponding to the rank is determined, and the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index.

  S13. Determine a first precoding matrix indicator PMI and a second PMI used to indicate a first precoding matrix, the first PMI and the first codebook index have a first correspondence , And the second PMI and the second codebook index have a second correspondence.

  S14. Send to the base station the first PMI and the second PMI used to indicate the first precoding matrix.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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}.

  Thus, the method for transmitting a four-antenna precoding matrix according to this embodiment of the invention results in more precoding matrices applicable to the uniform linear array antenna being shown without changing the feedback mode or feedback bits. System performance can be improved and user experience can be improved, as it can also be ensured that the performance for polarization sharing antenna applications is not affected.

  In particular, at S11, the user equipment may determine the rank used to indicate the number of transmission layers, eg, based on Channel State Information (abbreviated "CSI"). It should be understood that the UE may determine the rank by using methods well known to the person skilled in the art, which is not further described here for the sake of brevity.

In S12, in the codebook set corresponding to the rank, the first precoding matrix that the UE wants the eNB to use when transmitting downlink data, for example, based on CSI in the codebook set corresponding to the rank Can be determined. All precoding matrices contained in the codebook set corresponding to rank, for example, may be represented by the first codebook index i ₁ and the second codebook index i _2.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

At S13, the UE may determine a first PMI and a second PMI used to indicate a first precoding matrix. That is, in this embodiment of the present invention, all the precoding matrices contained in the codebook set corresponding to rank well by the first codebook index i ₁ and the second codebook index i _2, the It may also be represented by one PMI I _PMI1 and a second PMI I _PMI2 .

である。第2のPMI I_PMI2および第2のコードブックインデックスi₂は、第2の対応を有し得、第2の対応は、機能関係またはマッピング関係であり得、たとえば、第2のPMI I_PMI2は、第2のコードブックインデックスi₂の値の範囲における値の通し番号を示すために使用される。 In this embodiment of the present invention, the first PMI I _{PMI 1} and the first codebook index i ₁ may have a first correspondence, the first support may be a function relationship or mapping relationship, e.g. ,

It is. Second PMI I _PMI2 and second codebook indices i ₂ may have a second correspondence, the second support may be a function relationship or mapping relation, for example, the second PMI I _PMI2 is , Second codebook index i ₂ used to indicate the serial number of the value in the range of values.

In this embodiment of the present invention, the set formed by the precoding matrix represented by first PMI I _{PMI 1} and the second PMI I _PMI2 is a proper subset of the codebook set, i.e., the present invention It should be understood that in this embodiment, the 4-antenna precoding matrix to be transmitted is a subsampled 4-antenna precoding matrix.

  In S14, the user equipment uses the first PMI and the second PMI, which are used to indicate the first precoding matrix, as channels, for example, PUCCH channels, Physical Uplink Shared Channel (abbreviated). And send to the base station on "PUSCH" or another channel.

  Optionally, in this embodiment of the invention, the user equipment sends the first PMI and the second PMI used to indicate the first precoding matrix to the base station in one uplink channel. The uplink channel may be a channel such as PUCCH or PUSCH. For example, the user equipment may transmit the first PMI and the second PMI used to indicate the first precoding matrix on one PUCCH, or the user equipment may indicate the first precoding matrix The first PMI and the second PMI used for transmitting on one PUSCH. The user equipment may also send separately to the base station the first PMI and the second PMI used to indicate the first precoding matrix, although this embodiment of the invention is not limited thereto. It should be understood.

およびn=0, 1, …, 15である。 In this embodiment of the present invention, the precoding matrix W included in the codebook set corresponding to the rank has the following formula (4),
W = W ₁ × W ₂ (4)
The filling,

And n = 0, 1, ..., 15.

  In this embodiment of the invention, one first codebook index corresponds to one value of n and the range of values of n is 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}.

Optionally, in this embodiment of the invention, the first codebook index and n have the same value. For example, if the value of the first codebook index is one, then the value of n is also one, ie, if i ₁ = 1 then n = 1. Although this embodiment of the present invention is described by using the case where the first codebook index and n have the same value merely as an example, the present invention provides that the value of n is the first codebook index. It should be understood that it is not limited to this as long as it is uniquely determined according to the value of.

  In this embodiment of the invention, optionally, if the rank is determined to be 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8 , 9, 10, 11, 12, 13, 14, 15}.

（5）を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be 1, then W ₂ is:

Meet (5),

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

  In this embodiment of the invention, optionally, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

（6）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the UE is 2, then W ₂ is:

Meet (6),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

（7）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be ₂ , W ₂ is

Meet (7),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

That is, in this embodiment of the present invention, if the user equipment determines that the rank used to indicate the number of transmission layers is two, then W ₂ satisfies equation (6) or W ₂ Satisfies the equation (7).

  In this embodiment of the present invention, optionally, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

It should be understood that in this embodiment of the invention, Table A, Table B1 and Table B21 only provide one presentation of the precoding matrix W claimed by the present invention. There, i ₁ may correspond to W ₁ in the precoding matrix W = W ₁ × W ₂ and i ₂ may correspond to W ₂ . This embodiment of the invention is described by using the first codebook index, the second codebook index, and its values in Table A, Table B1 and Table B2 by way of example only, but the invention Is not limited to this. The precoding matrix W determined in Table A, Table B1 and Table B2 may be further represented by using another index or another index value.

であり、Aは、定数である。 In this embodiment of the present invention, optionally, 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 Indicated by the second codebook index,

And A is a constant.

  It should be understood that, in this embodiment of the invention, "mod" stands for modulo operation.

  Thus, the method for transmitting a four-antenna precoding matrix according to this embodiment of the invention results in more precoding matrices applicable to the uniform linear array antenna being shown without changing the feedback mode or feedback bits. System performance can be improved and user experience can be improved, as it can also be ensured that the performance for polarization sharing antenna applications is not affected.

  In this embodiment of the invention, by analyzing the four antenna precoding matrix proposed in 3GPP and whose rank is 1, as shown in FIG. 7, a total of 16 DFT vectors are It can be seen that it is included in all four antenna precoding matrices / vectors whose rank is one.

According to Table 7, if the first codebook index value i ₁ or n is given, ie W ₁ is given, then the DFT vector is formed by only one of four beam directions or four vectors. obtain. _{Furthermore, i 1 = 0, 1,} 2, 3, 4, 5, 6, a 7, for i ₁ and i ₁ +8, X _n is the W _1, includes the same four beam direction thereof The difference between them is that the values of α (i) are different for the same beam direction.

であり、i₁=8に関し、

である。すなわち、i₁=0である場合、X₀の第1のベクトルは、

であり、i₁=8である場合、X₈の第1のベクトルは、

である。したがって、列シフトが、X₀およびX₈の2つについて行われるが、X₀およびX₈に含まれるベクトルは同一である。 For example, for i ₁ = 0

For i ₁ = 8,

It is. That is, if i ₁ = 0, then the first vector of X ₀ is

And if i ₁ = 8, then the first vector of X ₈ is

It is. Thus, the column shift is carried out for two of X ₀ and X _8, vectors included in X ₀ and X ₈ are the same.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  In this embodiment of the present invention, optionally, the first codebook index value range corresponding to the first PMI and the second codebook index value range corresponding to the second PMI are associated. Having has that the range of values of the first codebook index corresponding to the first PMI comprises a set of at least two first values having different elements and a second code corresponding to the second PMI The range of book index values includes a set of at least two second values having different elements, and the set of at least two first values and the at least two second values have a one-to-one correspondence Including having.

  It should be understood that the number of first set of values is equal to the number of second set of values. It should be further 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.

  In this embodiment of the present invention, optionally, the first codebook index value range corresponding to the first PMI and the second codebook index value range corresponding to the second PMI are associated. Having has that the range of values of the first codebook index corresponding to the first PMI comprises a set of at least two first values having different elements and a second code corresponding to the second PMI The range of book index values includes a set of at least two second values having different elements, and the set of at least two first values and the at least two second values have a one-to-one correspondence Including having.

  It should be understood that the number of first set of values is equal to the number of second set of values. It should be further 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.

  Optionally, the first set of values of each of the at least two first sets of values comprises at least two values, and the second set of values of each of the at least two second sets of values is It contains at least two values.

  In this embodiment of the invention, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association relationship, so that The method for transmitting the precoding matrix according to this embodiment of the invention allows more precoding matrix applicable to the uniform linear array antenna to be shown without changing the feedback mode or feedback bits. System performance may be improved and user experience may be improved, as it may also be ensured that the performance for polarization sharing antenna applications is not affected.

  The following description illustrates the interrelationship 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. Use as.

  In this embodiment of the invention, optionally, if the rank is determined to be one, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second The second codebook index corresponding to PMI is determined according to Table C1

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

Referring to Table 7, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second codebook index corresponding to the second PMI are shown in Table C1. If so, then the codebook containing the 16 subsampled precoding matrices has a total of 8 DFT vectors, in this case the second, as shown in Table C1. It can be seen that the corresponding values of the codebook index i ₂ of are 0, 1, 6, 7, 8, 9, 14, and 15.

を表し、1ビットが第2のPMIを表すために使用され、i₂および第2のPMI I_PMI2は、たとえば、以下の式（8）、

（8）を満たし、
「mod」はモジュロを表し、

は、切り捨てを表す。 Thus, if the precoding matrix is transmitted by using submode 2 of PUCCH mode 1-1, the 4 antenna codebook according to this embodiment of the invention is as good as the 3GPP LTE R8 codebook Furthermore, each precoding matrix included in the four-antenna codebook according to this embodiment of the present invention is applicable to a dual polarization antenna. In Table C1, a total of 4 bits may be used to transmit the first precoding matrix, 3 bits the first PMI,

The stands, 1 bit is used to represent the second PMI, i ₂ and the second PMI I _PMI2, for example, the following equation (8),

Meet (8),
"Mod" stands for modulo,

Represents a truncation.

_{Referring to} Table C1, if the range of values of I _{PMI 1} or i ₁ is 0, then the corresponding range of values of i ₂ is (0, 2) and the range of values of I _PMI 1 is i, i If the range of corresponding values of ₂ is (4, 6) and the range of values of I _PMI1 is 2, then the range of corresponding values of i ₂ is (8, 10), I _{PMI 1} If the range of values is 3, then the range of corresponding values of i ₂ is (12, 14), and if the range of values of I _{PMI 1} is 4, then the range of corresponding values of i ₂ is (( If the range of values of I _PMI1 is 5, then the corresponding range of values of i ₂ is (5, 7), and if the range of values of I _{PMI 1} is 6, i If the range of corresponding values of ₂ is (9, 11) and the range of values of I _PMI1 is 7, then the range of corresponding values of i ₂ is (13, 15). That is, the value or range of values of i ₂ corresponding to _{IPMI 2} is associated with the value or range of values of i ₁ corresponding to _{IPMI 1} .

  Thus, with the method for transmitting a four-antenna precoding matrix according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas code without changing the feedback mode or feedback bits Each precoding matrix in the codebook set after subsampling can be shown during book subsampling, applicable to dual polarization antennas, which is the performance for the dual polarization antenna application Can be guaranteed to be unaffected, improve system performance, and improve user experience.

  In this embodiment of the invention, optionally, if the rank is determined to be one, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second The second codebook index corresponding to PMI is determined according to Table C2,

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

（9）を満たし、
「mod」は、モジュロを表し、

は、切り捨てを表す、ということが理解されるべきである。 In Table C2, the second codebook indices i ₂ and the second PMI I _PMI2, for example, the following equation (9),

Meet (9),
"Mod" stands for modulo,

It should be understood that the represents a truncation.

Similarly, in Table C2 there are a total of eight DFT vectors, and in this case the corresponding values of the _second codebook index i ₂ are: 2, 3, 4, 5, 10, 11, 12, And 13.

  In this embodiment of the invention, optionally, if the rank is determined to be one, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second The second codebook index corresponding to PMI is determined according to Table C3

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

Referring to Table 7, 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 shown in Table C3. If so, then the codebook containing the 16 subsampled precoding matrices has a total of 8 DFT vectors, in this case the second, as shown in Table C3. It can be seen that the corresponding values of the codebook index i ₂ of are 0, 1, 2, 3, 8, 9, 10 and 11.

を表し、1ビットが第2のPMIを表すために使用され、i₂および第2のPMI I_PMI2は、たとえば、以下の式（10）、

（10）を満たし、
「mod」はモジュロを表し、

は、切り捨てを表す。 Thus, if the precoding matrix is transmitted by using submode 2 of PUCCH mode 1-1, the 4 antenna codebook according to this embodiment of the invention is as good as the 3GPP LTE R8 codebook Furthermore, each precoding matrix included in the four-antenna codebook according to this embodiment of the present invention is applicable to a dual polarization antenna. In Table C3, a total of 4 bits may be used to transmit the first precoding matrix, 3 bits the first PMI,

The stands, 1 bit is used to represent the second PMI, i ₂ and the second PMI I _PMI2, for example, the following equation (10),

Meet (10),
"Mod" stands for modulo,

Represents a truncation.

_{Referring to} Table C3, when the range of values of I _PMI1 is (0, 4), the range of corresponding values of i ₁ is (0, 8) and the range of corresponding values of i ₂ is (0 , 2) and the range of values of I _PMI1 is (1, 5), the range of corresponding values of i ₁ is (2, 10) and the range of corresponding values of i ₂ is If (8, 10) and the range of values of I _PMI1 is (2, 6), the range of corresponding values of i ₁ is (4, 12) and the range of corresponding values of i ₂ Is (1, 3) and the range of values of I _PMI 1 is (3, 7), the range of corresponding values of i ₁ is (6, 14) and the corresponding values of i ₂ The range of is (9, 11). That is, the value or range of values of i ₂ corresponding to _{IPMI 2} is associated with the value or range of values of i ₁ corresponding to _{IPMI 1} .

  In this embodiment of the invention, optionally, if the rank is determined to be one, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second The second codebook index corresponding to PMI is determined according to Table C4

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

Similarly, in Table C4 there are a total of eight DFT vectors, and in this case, the corresponding values of the _second codebook index i ₂ are: 4, 5, 6, 7, 12, 13, 14, And 15.

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 listed in Tables C1, C2, C3, or C4. It is understood that the precoding matrix W determined according to the _first codebook index i ₁ and the second codebook index i ₂ may be determined according to Table A if it has the indicated correlation And should not be described further here for the sake of brevity.

It should be understood that the base station (eNB) may first configure a Channel State Information Reference Signal (abbreviated "CSI-RS") for the UE. In particular, for the N _t antennas or N _t antenna ports of the base station, the base station configures N _T CSI-RS antenna port resources for the UE, where N _t is a natural number For example, N _t is equal to 4. In this case, the UE may measure the channel quality of the corresponding CSI-RS resource, and the RI, PMI, CQI, etc. that the UE wants the eNB to use when transmitting downlink data by the base station. It can be decided. After determining channel state information (Channel State Information, abbreviated “CSI”) such as RI, PMI, and CQI, the UE may feed back CSI to the base station with feedback resources configured by the eNB for the UE. For example, the feedback mode configured by the eNB for the UE is submode 2 of PUCCH mode 1-1, in response, the UE feeds back the RI in the subframe to feed back the RI, and I _{PMI 1,} I _PMI2, and CQI, first PMI I _{PMI 1,} the second PMI I _PMI2, and separately fed back in a subframe for feeding back CQI, which is here any further for brevity Not explained.

  In this embodiment of the invention, the precoding matrix set may be called a codebook, and each precoding matrix in the precoding matrix set may be called a codeword, but the invention is not limited thereto It should be further understood.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, in the method for transmitting a 4-antenna precoding matrix according to this embodiment of the invention, a second codebook index value range corresponding to a first PMI and a second corresponding to a second PMI. Since the range of values of the codebook index of has an association, more precoding matrices applicable to uniform linear array antennas are indicated during codebook subsampling without changing the feedback mode or feedback bits And each precoding matrix in the codebook set after subsampling is applicable to dual polarization antennas, which means that the performance for dual polarization antenna applications is not affected Guaranteed, system puff The resulting improved-performance, can improve the user experience.

  FIG. 2 shows another schematic flowchart of a method 20 for transmitting a 4-antenna precoding matrix according to an embodiment of the present invention. Method 20 may be performed by, for example, user equipment. As shown in FIG. 2, method 20 includes the following.

  S21. Determine the rank used to indicate the number of transmission layers.

  S22: Determine a value of a first codebook index corresponding to one precoding matrix in a codebook set, the codebook set corresponds to a rank, and a precoding matrix included in the codebook set is a first It is represented by the codebook index and the second codebook index.

  S23: determine a joint-coded value corresponding to the rank and the value of the first codebook index, the joint-coded value and the rank have a first correspondence, the joint-coded value and the first The codebook index of has a second correspondence.

  S24: Send the joint coded value to the base station.

およびn=0, 1, …, 15であり、第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, the first codebook index corresponds to one value of n, and the range of values of n is 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}.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

（5）を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be 1, then W ₂ is:

Meet (5),

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

（6）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the UE is 2, then W ₂ is:

Meet (6),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

（7）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be ₂ , W ₂ is

Meet (7),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

That is, in this embodiment of the present invention, if the user equipment determines that the rank used to indicate the number of transmission layers is two, then W ₂ satisfies equation (6) or W ₂ Satisfies the equation (7).

In this embodiment of the present invention, if a four-antenna codebook is transmitted in submode 1 of PUCCH mode 1-1, the solution used for joint coding rank RI and i ₁ needs to be designed is there. If the rank is 2, then the 4-antenna codebook determined according to Table B1 (corresponding to Equation (6)) or Table B2 (corresponding to Equation (7)) contains many repeated precoding matrices.

を満たし、

および

（n=0, 1, …, 15）である。 In particular, for the solution represented by equation (6) (hereinafter abbreviated as solution 1) and the solution represented by equation (7) (hereinafter abbreviated as solution 2), W ₁ is the following equation ,

The filling,

and

(N = 0, 1, ..., 15).

および

である場合、X₀およびX₈に含まれるビーム方向または列ベクトルが同一であること、および列ベクトルの順序のみが異なることが明らかである。結果として、ランクが2である場合、いくつかのコードワードが、W=W₁・W₂に基づいて生成されたコードブックにおいて繰り返される。いくつかのコードワードが繰り返される問題は、ソリューション1とソリューション2の両方に存在する。 Thus, the four beam directions or column vectors contained in X _n and X _{n + 8} (in this case n = 0 to 7) are identical. For example,

and

It is clear that the beam directions or column vectors contained in X ₀ and X ₈ are identical, and that only the order of the column vectors is different. As a result, if the rank is 2, then several codewords are repeated in the generated codebook based on W = W ₁ · W ₂ . The problem that several codewords are repeated exists in both Solution 1 and Solution 2.

を満たし、

であり、e_iおよびe_kは、4×1の次元を有する1つの列ベクトルを表し、e_iにおけるi番目の要素は1であり、すべての他の要素は0である。 As an example, for both Solution 1 and Solution 2, W ₂ is

The filling,

Where e _i and e _k represent one column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0.

である場合、

であり、n=8および

である場合、

である。 n = 0 and

If it is,

, N = 8 and

If it is,

It is.

  It is clear that the two code words represented when n is equal to 0 and n is equal to 8 are identical. System performance is degraded as a large number of repeated codewords can reduce the efficiency of the codebook. Therefore, when subsampling is performed on a codebook, it is required that the codebook after subsampling is performed does not include repeated codewords or repeated precoding matrices. It should be understood that the above analysis is not limited to this embodiment.

The 4-antenna codebook whose rank is 3 or 4 in R12 is the codebook in R8. Accordingly relates codebook that rank is 3 or 4, W ₁ corresponding to i ₁ is an identification matrix need not be represented by the bit. If the rank and PMI of the precoding matrix are transmitted in submode 1 of PUCCH mode 1-1, the rank and i ₁ are jointly coded and subsampling is performed for i ₁ , in this case the subsampling is i ₂ Not about.

For a codebook whose rank is 2, if i ₁ is represented by 3 bits after subsampling, the range of values of _n in X _n corresponding to i ₁ for which subsampling was performed is from 0 to 7 or 8 It is required that the value of n be in the range of 0, 2, 4, 6, 8, 10, 12, 14 or 1, 3, 5, 7, 9, 11, 13, 15 is required. I will not. This can prevent the occurrence of repeated matrices. Furthermore, for codebooks whose rank is 1, the range of values of _n in X _n is 0 to 7 or 8 to 15, all identical to the range of values in the situation whose rank is 2 and all Can include the direction of

Its rank relates codebook is 1 or 2, if four states of i ₁ for i ₁ after subsampling has been performed is represented by 2 bits, PUCCH resources a total of 3 bits represent the precoding matrix Is required for In this case, _n at X _n corresponding to i ₁ after subsampling is (0, 2, 4, 6), (1, 3, 5, 7), (8, 10, 12, 14) Or (9, 11, 13, 15). In this case, the space and beam directions may be divided equally for all vectors in X _n .

In addition, for codebooks whose rank is 1 or 2, if the number of states after subsampling for i ₁ is not 2 raised to the power of x (x is an integer), then i ₁ It should be prevented as much as possible that n and n + 8 corresponding to n simultaneously exist. For example, if the number of states Z after subsampling for i ₁ satisfies 8>Z> 4 and Y is an integer, the range of values of n is (0, 2, 4, 6, 8 , 10, 12, 14) or Z values in (1, 3, 5, 7, 9, 11, 13, 15).

は1つの方向を表し、これは、

によって表され得、xは、整数であり、xの値の範囲は、0から31である。

であるので、

である。たとえば、nの値の範囲が(0, 2, 4, 6)である場合、X_nにおけるすべての方向（ベクトル）は、

によって表され、これは、16個の方向、0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28であり得るので、空間が均等に分割され得る。 One vector in X _n

Represents one direction, which is

Where x is an integer, and the range of values for x is 0 to 31.

Because

It is. For example, if the range of values for n is (0, 2, 4, 6) then all directions (vectors) in X _n are

, Which can be 16 directions, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, so that the space is even It can be divided.

  In particular, in this embodiment of the present invention, optionally, if the number of bits carrying the joint coded value is four, then the correspondence between the joint coded value and the rank and the joint coded value and the first The correspondence between the and the codebook index is determined according to Table D below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  Optionally, in this embodiment of the invention, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table E below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  It should be understood that, in this embodiment of the invention, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A.

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2 And

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, if the precoding matrix is transmitted in sub-mode 1 of PUCCH mode 1-1, the method for transmitting a 4-antenna precoding matrix according to this embodiment of the invention repeats the precoding matrix after subsampling Can improve system performance and improve the user experience.

  FIG. 3 shows still another schematic flowchart of a method 30 for transmitting a four antenna precoding matrix according to an embodiment of the present invention. Method 30 may be performed by user equipment, for example. As shown in FIG. 3, method 30 includes the following.

  S31. Determine the rank used to indicate the number of transmission layers.

  The first precoding matrix in the codebook set corresponding to the S. 32 rank is determined, and the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index.

  S33: Determine a second precoding matrix indicator PMI used to indicate the first precoding matrix, the second PMI and the second codebook index have a first correspondence, one For a given first codebook index, the second codebook index value range corresponding to the second PMI value range is an appropriate subset of the second codebook index value range .

  S34: Send to the base station the second PMI used to indicate the first precoding matrix.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
ランクが2であると決定された場合、第1のコードブックインデックスと第2のPMIの値の範囲に対応する第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
If the rank is determined to be 2, the first set of precoding matrices determined according to the first codebook index and the second codebook index corresponding to the second PMI value range Codebook index

First precoding matrix set and first codebook index corresponding to

The second set of precoding matrices corresponding to are mutually exclusive and the first codebook index

Represents the first codebook index corresponding to n whose value is a, the first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  In the case where the precoding matrix is sent in PUCCH mode 2-1, if rank is 1 then subsampling is not performed for the codebook and if rank is 2 then subsampling is performed for the first codebook index Although not, subsampling is performed on the second codebook index, and the second codebook index is represented by 2 bits, not by the original 4 bits after subsampling.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

（5）を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be 1, then W ₂ is:

Meet (5),

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

（6）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the UE is 2, then W ₂ is:

Meet (6),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

（7）を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank is determined to be ₂ , W ₂ is

Meet (7),
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

That is, in this embodiment of the present invention, if the user equipment determines that the rank used to indicate the number of transmission layers is two, then W ₂ satisfies equation (6) or W ₂ Satisfies the equation (7).

  In this embodiment of the invention, the second PMI, the first codebook index, and the second PMI are optionally optionally determined to have a rank of 2 to prevent the problem of overlapping codewords. The correlation between codebook indices is determined according to table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  Thus, the method for transmitting a four-antenna precoding matrix according to this embodiment of the invention results in more precoding matrices applicable to the uniform linear array antenna being shown without changing the feedback mode or feedback bits. System performance can be improved as it can also be guaranteed that the performance for polarization sharing antenna applications is not affected and the problem of overlapping codewords after subsampling can be prevented, The user experience can be improved.

In this embodiment of the invention, optionally, if the rank is determined to be 3 or 4, then the precoding matrix included in the codebook set corresponding to the rank is:
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

  In particular, the precoding matrix whose rank is determined to be 3 or 4 and included in the codebook set corresponding to the rank is the four precoding matrices with codebook indices 0 to 3 or 4 to 7 in Table G In the case where a rank regression is performed and the rank is back to rank 1, four uniform DFT vectors may be obtained. These DFT vectors are applicable to ULA antennas, and four DFT vectors are also applicable to polarization sharing antennas.

  If the rank is determined to be 3 or 4, and the precoding matrix included in the codebook set corresponding to the rank is four precoding matrices with codebook indices 12 to 15 in Table G, then 4 precoding matrices The matrix is an open loop precoding matrix, and the four precoding matrices have large chordal distances.

  It should be understood that, in this embodiment of the invention, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A.

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2 And

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, if the precoding matrix is transmitted in PUCCH mode 2-1, the method for transmitting a 4-antenna precoding matrix according to this embodiment of the invention prevents the problem that the precoding matrix is repeated after subsampling Can improve system performance and improve the user experience.

  A method for transmitting a four antenna precoding matrix according to an embodiment of the present invention is described in detail above based on user equipment with reference to FIGS. 1 to 3. The following describes a method for transmitting a 4-antenna precoding matrix according to an embodiment of the present invention based on a base station, with reference to FIGS. 4 to 6.

  As shown in FIG. 4, a method 60 for transmitting a four antenna precoding matrix according to an embodiment of the present invention may be performed by a base station. Method 60 includes the following.

  S61: Receive a rank, used to indicate the number of transmission layers, sent by the user equipment, a first precoding matrix indicator PMI, and a second PMI.

  S62: Determine a first precoding matrix in the codebook set corresponding to the rank according to the first PMI and the second PMI, and the precoding matrix included in the codebook set is the first codebook index and The first PMI and the first codebook index have a first correspondence, and the second PMI and the second codebook index have a second correspondence, represented by a second codebook index. Have.

およびn=0, 1, …, 15であり、第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, the first codebook index corresponds to one value of n, and the range of values of n is 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}.

  Thus, the method for transmitting a four-antenna precoding matrix according to this embodiment of the invention results in more precoding matrices applicable to the uniform linear array antenna being shown without changing the feedback mode or feedback bits. System performance can be improved and user experience can be improved, as it can also be ensured that the performance for polarization sharing antenna applications is not affected.

  In this embodiment of the present invention, it is understood that the base station may receive the PMI sent by the UE according to the CSI information sent by the UE, and the CSI information may further include RI, CQI, etc. It should be. The base station may obtain a precoding matrix fed back by the UE according to RI and PMI, and may obtain channel quality when the precoding matrix is used according to CQI. When the base station performs single-user MIMO transmission for the UE, the base station may perform precoding on downlink data of the UE by using a precoding matrix, and transmit downlink data according to the CQI. The modulation and coding scheme to perform can be determined. If the base station performs multi-user MIMO transmission for the UE, eg, multi-user MIMO for two users, then the base station pairs the UE with the precoding matrix fed back by the UE. According to the precoding matrix fed back by using the Zero Forcing (abbreviated "ZF") method, it is possible to obtain a precoding matrix that eliminates multi-user interference. Thus, the eNB may perform precoding for downlink data of multi-user MIMO by using a precoding matrix, and further, the base station may perform two users according to CQIs fed back by two users. The modulation and coding scheme for performing multi-user MIMO transmission may be determined, which is not further described here for the sake of brevity.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the received rank is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

  In this embodiment of the invention, optionally, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank determined by the UE is 2, W ₂ is:

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank is determined to be ₂ , W ₂ is

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the present invention, optionally, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  In this embodiment of the invention, optionally, if the received rank is 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14, 15}.

であり、Aは、定数である。 In this embodiment of the present invention, optionally, 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 Indicated by the second codebook index,

And A is a constant.

  It should be understood that, in this embodiment of the invention, "mod" stands for modulo operation.

  Thus, the method for transmitting a four-antenna precoding matrix according to this embodiment of the invention results in more precoding matrices applicable to the uniform linear array antenna being shown without changing the feedback mode or feedback bits. System performance can be improved and user experience can be improved, as it can also be ensured that the performance for polarization sharing antenna applications is not affected.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  In this embodiment of the present invention, optionally, the first codebook index value range corresponding to the first PMI and the second codebook index value range corresponding to the second PMI are associated. Having has that the range of values of the first codebook index corresponding to the first PMI comprises a set of at least two first values having different elements and a second code corresponding to the second PMI The range of book index values includes a set of at least two second values having different elements, and the set of at least two first values and the at least two second values have a one-to-one correspondence Including having.

  It should be understood that the number of first set of values is equal to the number of second set of values. It should be further 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.

  In this embodiment of the present invention, optionally, the first codebook index value range corresponding to the first PMI and the second codebook index value range corresponding to the second PMI are associated. Having has that the range of values of the first codebook index corresponding to the first PMI comprises a set of at least two first values having different elements and a second code corresponding to the second PMI The range of book index values includes a set of at least two second values having different elements, and the set of at least two first values and the at least two second values have a one-to-one correspondence Including having.

  It should be understood that the number of first set of values is equal to the number of second set of values. It should be further 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.

  Optionally, the first set of values of each of the at least two first sets of values comprises at least two values, and the second set of values of each of the at least two second sets of values is It contains at least two values.

  In this embodiment of the invention, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association relationship, so that The method for transmitting the precoding matrix according to this embodiment of the invention allows more precoding matrix applicable to the uniform linear array antenna to be shown without changing the feedback mode or feedback bits. System performance may be improved and user experience may be improved, as it may also be ensured that the performance for polarization sharing antenna applications is not affected.

  In this embodiment of the invention, optionally, if the rank is determined to be one, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and a second The second codebook index corresponding to PMI is determined according to table C1, C2, C3 or C4,

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

  It should be understood that the base station and user equipment interactions and related features and functions described at the base station side correspond to the user equipment side description with respect to FIG. Not be described here any more.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, in the method for transmitting a 4-antenna precoding matrix according to this embodiment of the invention, a second codebook index value range corresponding to a first PMI and a second corresponding to a second PMI. Since the range of values of the codebook index of has an association, more precoding matrices applicable to uniform linear array antennas are indicated during codebook subsampling without changing the feedback mode or feedback bits And each precoding matrix in the codebook set after subsampling is applicable to dual polarization antennas, which means that the performance for dual polarization antenna applications is not affected Guaranteed, system puff The resulting improved-performance, can improve the user experience.

  FIG. 5 shows another schematic flowchart of a method 70 for transmitting a four antenna precoding matrix according to an embodiment of the present invention. Method 70 may, for example, be performed by a base station. As shown in FIG. 5, method 70 includes the following.

  S71: Receive the joint coded value sent by the user equipment.

  S72: Jointly coded with the correspondence between the value of the first codebook index according to the joint coded value and the rank used to indicate the number of transmission layers, the joint coded value and the rank Determine the correspondence between the value and the first codebook index.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 The value of the first codebook index corresponds to one precoding matrix set in the codebook set, the codebook set corresponds to the rank, and the precoding matrix included in the codebook set is the first codebook The precoding matrix W represented by the index and the second codebook index and contained in the codebook set satisfies the following formula: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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 }.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank is determined to be 1, then W ₂ is

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank is determined to be ₂ , W ₂ is

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 4, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table D below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table E below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  It should be understood that, in this embodiment of the invention, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A.

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2 And

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  It should be understood that the base station and user equipment interactions and associated features and functions described at the base station side correspond to the user equipment side description with respect to FIG. 2, which is a simplification Not be described here any more.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

  FIG. 6 shows yet another schematic flowchart of a method 80 for transmitting a four antenna precoding matrix according to an embodiment of the present invention. Method 80 may be performed by a base station, for example. As shown in FIG. 6, method 80 includes the following.

  S81: Receive a second precoding matrix indicator PMI sent by the user equipment, a first codebook index, and a rank used to indicate the number of transmission layers.

  S82: Determine a first precoding matrix in the codebook set corresponding to the rank according to the second PMI and the first codebook index, and the precoding matrix included in the codebook set is the first codebook The second PMI and the second codebook index, represented by the index and the second codebook index, have a first correspondence, and for one given first codebook index, the second The second codebook index value range corresponding to the PMI value range is a suitable subset of the second codebook index value range.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
受信されたランクが2である場合、第1のコードブックインデックスと第2のPMIの値の範囲に対応する第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
If the received rank is 2, the first code in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the second PMI value range Book index

First precoding matrix set and first codebook index corresponding to

The second set of precoding matrices corresponding to are mutually exclusive and the first codebook index

Represents the first codebook index corresponding to n whose value is a, the first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the received rank is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the received rank is 2, W ₂ is

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the received rank is 2, then the correlation between the second PMI, the first codebook index, and the second codebook index is given in Table F1 or Determined according to F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  It should be understood that, in this embodiment of the invention, if the rank is determined to be 1, the precoding matrix W included in the codebook set is determined according to Table A.

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2 And

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

In this embodiment of the present invention, optionally, if the received rank is 3 or 4, the precoding matrix included in the codebook set corresponding to the rank is:
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

  It should be understood that the base station and user equipment interactions and related features and functions described at the base station side correspond to the user equipment side description with respect to FIG. 3, which is a simplification Not be described here any more.

  It should be further understood that the above process serial numbers do not imply the order of execution in the various embodiments of the present invention. The order of execution of the processes should be determined according to the functions of the processes and the internal circuitry, and should not be interpreted as any limitation on the realization process of the embodiment of the present invention.

  Thus, the method for transmitting a four antenna precoding matrix according to this embodiment of the invention improves system performance and improves the user experience by preventing problems where the precoding matrix is repeated after subsampling. obtain.

  The method for transmitting a 4-antenna precoding matrix according to an embodiment of the present invention is described in detail above with reference to FIGS. The following describes user equipment and a base station according to an embodiment of the present invention with reference to FIGS. 7 to 18.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 FIG. 7 shows a schematic block diagram of a user equipment 100 according to an embodiment of the present invention. As shown in FIG.
A pre configured to determine a rank used to indicate the number of transmission layers, and further configured to determine a first precoding matrix in a codebook set corresponding to the rank, and included in the codebook set The coding matrix is represented by a first codebook index and a second codebook index, and is used to indicate a first precoding matrix indicator PMI and a second PMI used to indicate the first precoding matrix. The first PMI and the first codebook index have a first correspondence, and the second PMI and the second codebook index have a second correspondence, further configured to determine Module 110,
A delivery module 120 used to indicate the first precoding matrix and configured to deliver the first PMI and the second PMI determined by the determination module 110 to the base station,
The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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}.

  Thus, with the user equipment according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the determination module 110 is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank determined by the determination module 110 is 2, W ₂ is:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 In this embodiment of the present invention, optionally, 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 Indicated by the second codebook index,

And A is a constant.

  In this embodiment of the invention, optionally, if the rank determined by the determination module 110 is 1, then the precoding matrix W included in the codebook set is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  In this embodiment of the invention, optionally, if the rank determined by the determination module 110 is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  In this embodiment of the present invention, optionally, if the rank determined by the determination module 110 is 1, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and The second codebook index corresponding to the second PMI is determined according to Table C1, C2, C3 or C4,

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

  In this embodiment of the invention, optionally, if the rank determined by the determination module 110 is 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7}. Or {8, 9, 10, 11, 12, 13, 14, 15}.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  The user equipment 100 according to this embodiment of the invention may correspond to a user equipment performing a method for transmitting a four antenna precoding matrix according to embodiments of the invention, and the above and other of the modules in the user equipment 100 It should be understood that the operations and / or functions are used to realize the corresponding steps of the method in FIG. 1, which are not further described here for the sake of brevity.

  Thus, with the user equipment according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 FIG. 8 shows a schematic block diagram of a user equipment 200 according to an embodiment of the present invention. As shown in FIG.
Configured to determine a rank used to indicate the number of transmission layers, and further configured to determine a value of a first codebook index corresponding to one precoding matrix set in the codebook set, The codebook set corresponds to the rank, and the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and the rank and the value of the first codebook index And the joint-coded values and the rank have a first correspondence, and the joint-coded values and the first codebook index are further configured to determine a joint-coded value corresponding to A decision module 210 having a correspondence of
A delivery module 220 configured to deliver the joint coded values determined by the determination module 210 to the base station,
The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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 }.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the determination module 210 is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the determination module 210 is 2, W ₂ is

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 4, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table D below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table E below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  The user equipment 200 according to this embodiment of the invention may correspond to a user equipment performing a method for transmitting a four antenna precoding matrix according to an embodiment of the invention, the above and other of the modules in the user equipment 200 It should be understood that the operations and / or functions are used to implement the corresponding steps of the method in FIG. 2, which are not further described here for the sake of brevity.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
前記第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
前記決定モジュール310によって決定された前記ランクが2である場合、前記第1のコードブックインデックスと前記第2のPMIの前記値の範囲に対応する前記第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、前記第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、前記第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 FIG. 9 shows a schematic block diagram of a user equipment 300 according to an embodiment of the present invention. As shown in FIG.
Configured to determine a rank used to indicate the number of transmission layers, and further configured to determine a first precoding matrix in a codebook set corresponding to the rank and included in the codebook set The precoding matrix to be represented is determined by a first codebook index and a second codebook index to determine a second precoding matrix indicator PMI used to indicate the first precoding matrix And the second PMI and the second codebook index have a first correspondence, and for one given first codebook index, a range of values of the second PMI The range of values of the second codebook index corresponding to A decision module 310, which is a suitable subset of the range of values of the
A delivery module 320 used to indicate the first precoding matrix and configured to deliver the second PMI determined by the determination module 310 to a base station,
The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the rank determined by the determination module 310 is 2, determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI First codebook index in the precoding matrix set

First precoding matrix set and first codebook index corresponding to

The second precoding matrix set corresponding to is mutually exclusive and said first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the determination module 310 is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank determined by the determination module 310 is 2, W ₂ is:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the rank determined by the determination module 310 is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is , According to Table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

In this embodiment of the present invention, optionally, if the rank determined by the determination module 310 is 3 or 4, then the precoding matrix included in the codebook set corresponding to the rank is:
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  User equipment 300 according to this embodiment of the invention may correspond to user equipment performing a method for transmitting a four antenna precoding matrix according to embodiments of the invention, and the above and other of the modules in user equipment 300 It should be understood that the operations and / or functions are used to realize the corresponding steps of the method in FIG. 3, which are not further described here for the sake of brevity.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 FIG. 10 shows a schematic block diagram of a base station 600 according to an embodiment of the present invention. As shown in FIG.
A receiving module 610 configured to receive a rank, used by the user equipment to indicate the number of transmit layers, a first precoding matrix indicator PMI, and a second PMI;
Configured to determine a first precoding matrix in a codebook set corresponding to the rank received by the receiving module 610 according to the first PMI and the second PMI received by the receiving module 610, the code The precoding matrix included in the book set is represented by a first codebook index and a second codebook index, and the first PMI and the first codebook index have a first correspondence, and A second PMI and a second codebook index include a determination module 620 having a second correspondence;
The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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}.

  Thus, with the base station according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank received by the receiving module 610 is one, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the invention, optionally, if the rank received by the receiving module 610 is 2, W ₂ is

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

であり、Aは、定数である。 In this embodiment of the present invention, optionally, 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 Indicated by the second codebook index,

And A is a constant.

  In this embodiment of the present invention, optionally, if the rank received by the receiving module 610 is 1, then the precoding matrix W included in the codebook set is determined according to Table A,

であり、mおよびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M and k are non-negative integers, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

  In this embodiment of the invention, optionally, if the rank received by the receiving module 610 is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2,

であり、m、m'、およびkは、負でない整数であり、i₁は、第1のコードブックインデックスを表し、i₂は、第2のコードブックインデックスを表す。

, M, m ′, and k are non-negative integers, i ₁ represents a first codebook index, and i ₂ represents a _second codebook index.

  In this embodiment of the present invention, optionally, if the rank received by the receiving module 610 is 1, a first PMI, a second PMI, a first codebook index corresponding to the first PMI, and The second codebook index corresponding to the second PMI is determined according to Table C1, C2, C3 or C4,

I _PMI1 represents a first PMI, I _PMI2 represents a second PMI, i ₁ represents a _first codebook index, and i ₂ represents a _second codebook index.

  In this embodiment of the invention, optionally, if the rank received by the receiving module 610 is 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7}. Or {8, 9, 10, 11, 12, 13, 14, 15}.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 600 according to this embodiment of the invention may correspond to a base station performing a method for transmitting a precoding matrix according to an embodiment of the invention, the above and other operations of the modules in the base station 600 and It should be understood that / or the function is used to implement the corresponding procedure of the method in FIG. 4, which is not further described here for the sake of brevity.

  Thus, with the base station according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 FIG. 11 shows a schematic block diagram of a base station 700 according to an embodiment of the present invention. As shown in FIG.
A receiving module 710 configured to receive the joint coded values sent by the user equipment;
The correspondence between the value of the first codebook index according to the joint coded values received by the receiving module 710 and the rank used to indicate the number of transmission layers, the joint coded values and the rank And a determination module 720 configured to determine the correspondence between the joint coded value and the first codebook index,
The value of the first codebook index corresponds to one precoding matrix set in the codebook set, the codebook set corresponds to the rank, and the precoding matrix included in the codebook set is the first codebook The precoding matrix W represented by the index and the second codebook index and contained in the codebook set satisfies the following formula: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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 }.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

In this embodiment of the present invention, optionally, the range of values of the _first codebook index i ₁ is 0 ≦ i ₁ ≦ 15, and the range of values of the _second codebook index i ₂ is 0 ≦ i ₂ ≦ L ₂ −1, and L ₂ is a positive integer. For example, the range of values of L ₂ is 1 ≦ L ₂ ≦ 15, that is, the range of values of the _second codebook index i ₂ is, for example, 0 ≦ i ₂ ≦ 15.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank determined by the determination module 720 is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank determined by the determination module 720 is 2, W ₂ is:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 4, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table D below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  In this embodiment of the invention, optionally, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first code The correspondence with the book index is determined according to Table E below:

_{IRI / PMI1} represents a joint-coded value, RI represents a rank, and i1 represents a _first codebook index.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 700 according to this embodiment of the present invention may correspond to a base station performing a method for transmitting a precoding matrix according to an embodiment of the present invention, the above and other operations of the modules in the base station 700 and It should be understood that / or the function is used to implement the corresponding procedure of the method in FIG. 5, which is not further described here for the sake of brevity.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
受信されたランクが2である場合、第1のコードブックインデックスと第2のPMIの値の範囲に対応する第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 FIG. 12 shows a schematic block diagram of a base station 800 according to an embodiment of the present invention. As shown in FIG.
A receiving module 810 configured to receive a second precoding matrix indicator PMI sent by the user equipment, a first codebook index, and a rank used to indicate the number of transmission layers;
Configured to determine a first precoding matrix in a codebook set corresponding to the rank received by the receiving module 810 according to the second PMI received by the receiving module 810 and the first codebook index The precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and the second PMI and the second codebook index have the first correspondence. , For one given first codebook index, the second codebook index value range corresponding to the second PMI value range is appropriate for the second codebook index value range A decision module 820, which is a subset,
The precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
If the received rank is 2, the first code in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the second PMI value range Book index

First precoding matrix set and first codebook index corresponding to

The second set of precoding matrices corresponding to are mutually exclusive and the first codebook index

Represents the first codebook index corresponding to n whose value is a, the first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

を満たし、

であり、Yがe₁である場合、α（i）は、α（1）であり、Yがe₂である場合、α（i）は、α（2）であり、Yがe₃である場合、α（i）は、α（3）であり、Yがe₄である場合、α（i）は、α（4）であり、e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Aは、定数である。 In this embodiment of the invention, optionally, if the rank received by the receiving module 810 is 1, then W ₂ is:

The filling,

And if Y is e ₁ then α (i) is α (1) and if Y is e ₂ then α (i) is α (2) and Y is e ₃ In some cases, if α (i) is α (3) and Y is e ₄ , then α (i) is α (4) and e _i is a column vector with a dimension of 4 × 1 , The i-th element in e _i is 1, all other elements are 0, iε {1, 2, 3, 4}, and A is a constant.

または

を満たし、
e_iは、4×1の次元を有する列ベクトルを表し、e_iにおけるi番目の要素は、1であり、すべての他の要素は、0であり、i∈{1, 2, 3, 4}であり、Bは、定数である。 In this embodiment of the present invention, optionally, if the rank received by the receiving module 810 is 2, W ₂ is:

Or

The filling,
e _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4 } And B is a constant.

  In this embodiment of the invention, optionally, if the rank received by the receiving module 810 is 2, then the correlation between the second PMI, the first codebook index, and the second codebook index is , According to Table F1 or F2,

I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index.

In this embodiment of the invention, optionally, if the rank received by the receiving module 810 is 3 or 4, then the precoding matrix included in the codebook set corresponding to the rank is:
Four precoding matrices with codebook indices 0 to 3 in Table G, or four precoding matrices with codebook indices 4 to 7 in Table G, or four precodes with codebook indices 12 to 15 in Table G Is a coding matrix,

は、マトリックス

の列セット{s}によって形成されたマトリックスを表し、Iは、4×4の識別マトリックスである。

Is the matrix

Denoting the matrix formed by the set of columns {s} of, I is a 4 × 4 identification matrix.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 800 according to this embodiment of the present invention may correspond to a base station performing a method for transmitting a precoding matrix according to an embodiment of the present invention, the above and other operations of the modules in the base station 800 and It should be understood that / or the function is used to implement the corresponding procedure of the method in FIG. 6, which is not further described here for the sake of brevity.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

  In addition, the terms "system" and "network" may be used interchangeably herein. The term "and / or" as used herein describes only the association relationship to describe the associated objects, and indicates that three relationships may exist. For example, A and / or B may represent the following three cases: only A exists, both A and B exist, only B exists.

  It should be understood that in this embodiment of the present invention "B corresponding to A" represents that B and A are associated and B can be determined according to A. However, determining B according to A does not necessarily mean that B is determined only according to A, and it is further understood that B may be further determined according to A and / or other information. It should be understood.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 As shown in FIG. 13, embodiments of the present invention further provide a network device 1000. Network device 1000 includes a processor 1100, a memory 1200, a bus system 1300, and a transmitter 1400. Processor 1100, memory 1200, and transmitter 1400 are connected by using bus system 1300, and memory 1200 is configured to store instructions, and processor 1100 controls transmitter 1400 to transmit signals. In order to execute the instructions stored by the memory 1200. The processor 1100 determines a rank used to indicate the number of transmission layers and determines a first precoding matrix in the codebook set corresponding to the rank, where the precoding matrix included in the codebook set is Is determined by a first codebook index and a second codebook index to determine a first precoding matrix indicator PMI and a second PMI used to indicate the first precoding matrix , Where the first PMI and the first codebook index have a first correspondence, and the second PMI and the second codebook index have a second correspondence. . The transmitter 1400 is configured to send to the base station the first PMI and the second PMI used to indicate the first precoding matrix, and the precoding matrix W included in the codebook set is , The following formula, W = W ₁ × W ₂ is satisfied,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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}.

  Thus, with the user equipment according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

  It should be understood that in this embodiment of the invention, processor 1100 may be a Central Processing Unit ("CPU" for short). Processor 1100 may also be another universal processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), another programmable logic device, discrete gate, transistor logic device, or discrete hard disk. Can be a wear assembly, etc. The universal processor may be a microprocessor, or the processor may also be any common processor, etc.

  Memory 1200 may be read only memory or random access memory and provides instructions and data for processor 1100. A portion of memory 1200 may further include non-volatile random access memory. For example, memory 1200 may further store information about device types.

  In addition to the data bus, bus system 1300 may further include a power bus, a control bus, a status signal bus, and the like. However, various buses are shown as bus system 1300 in the drawings for the convenience of clear description.

  In the implementation process, the above method steps may be completed by using instructions in the form of hardware or integrated logic circuitry or software in the processor 1100. The steps relating to the methods disclosed in the embodiments of the present invention may be completed directly by a hardware processor or may be completed by a combination of hardware and software modules in a processor. The software module is in a mature storage medium in the art, such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable read only memory, or registers. It can be located. A storage medium is located on the memory 1200, and the processor 1100 completes the steps of the method by reading the information in the memory 1200 and using its hardware, which avoids repetition. It is not described in detail here.

Optionally, in one embodiment, if the rank determined by processor 1100 is one, then W ₂ satisfies Equation (5).

Optionally, in one embodiment, if the rank determined by processor 1100 is 2, W ₂ satisfies Equation (6) or Equation (7).

であり、Aは、定数である。 Optionally, in one embodiment, 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 the second Indicated by codebook index,

And A is a constant.

  Optionally, in one embodiment, if the rank determined by processor 1100 is 1, then the precoding matrix W included in the codebook set is determined according to Table A.

  Optionally, in one embodiment, if the rank determined by processor 1100 is 2, then the precoding matrix W included in the codebook set is determined according to Table B1 or B2.

  Optionally, in one embodiment, if the rank determined by processor 1100 is 1, then the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second PMI A second codebook index corresponding to is determined according to table C1, C2, C3 or C4.

  Optionally, in one embodiment, if the rank determined by processor 1100 is 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14, 15}.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  The user equipment 1000 according to this embodiment of the invention may correspond to a user equipment performing a method for transmitting a four antenna precoding matrix according to an embodiment of the invention, the above and other of the modules in the user equipment 1000 It should be understood that the operations and / or functions are used to realize the corresponding steps of the method in FIG. 1, which are not further described here for the sake of brevity.

  Thus, with the user equipment according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 As shown in FIG. 14, the embodiment of the present invention further provides a network device 2000. The network device 2000 includes a processor 2100, a memory 2200, a bus system 2300, and a transmitter 2400. Processor 2100, memory 2200, and transmitter 2400 are connected by using bus system 2300, memory 2200 is configured to store instructions, and processor 2100 controls transmitter 2400 to transmit signals. Are configured to execute the instructions stored by the memory 2200. Processor 2100 determines the rank used to indicate the number of transmission layers, and determines the value of the first codebook index corresponding to one precoding matrix set in the codebook set, where The set corresponds to a rank, and the precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and corresponds to the rank and the value of the first codebook index The joint-coded values and the rank have a first correspondence and the joint-coded values and the first codebook index have a second correspondence. , Configured as. The transmitter 1400 is configured to send the joint coded values to the base station, and the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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 }.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

Optionally, in one embodiment, if the rank determined by processor 2100 is 1, W ₂ satisfies equation (5).

Optionally, in one embodiment, if the rank determined by processor 2100 is 2, then W ₂ satisfies Equation (6) or Equation (7).

  Optionally, in one embodiment, if the number of bits carrying the joint coded value is four, then the correspondence between the joint coded value and the rank and the joint coded value and the first codebook index The correspondence between is determined according to Table D.

  Optionally, in one embodiment, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first codebook index The correspondence between is determined according to Table E.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  User equipment 2000 according to this embodiment of the invention may correspond to user equipment performing a method for transmitting a four antenna precoding matrix according to embodiments of the invention, and the above and other of the modules in user equipment 2000 It should be understood that the operations and / or functions are used to implement the corresponding steps of the method in FIG. 2, which are not further described here for the sake of brevity.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、プロセッサ3100によって決定されたランクが2である場合、第1のコードブックインデックスと第2のPMIの値の範囲に対応する第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 As shown in FIG. 15, embodiments of the present invention further provide a network device 3000. The network device 3000 includes a processor 3100, a memory 3200, a bus system 3300, and a transmitter 3400. Processor 3100, memory 3200, and transmitter 3400 are connected by using bus system 3300, memory 3200 is configured to store instructions, and processor 3100 controls transmitter 3400 to transmit signals. To execute the instructions stored by the memory 3200. Processor 3100 determines a rank used to indicate the number of transmission layers and determines a first precoding matrix in the codebook set corresponding to the rank, where the precoding matrix included in the codebook set is Is determined by the first codebook index and the second codebook index to determine a second precoding matrix indicator PMI used to indicate the first precoding matrix, where: The PMI and the second codebook index have a first correspondence, and for one given first codebook index, the value of the second codebook index corresponding to the range of values of the second PMI The range of values is configured to be an appropriate subset of the range of values of the second codebook index, It is. The transmitter 1400 is configured to send to the base station a second PMI, which is used to indicate the first precoding matrix, and the precoding matrix W included in the codebook set has the following formula: W Satisfy = W ₁ × W ₂ ,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}, and if the rank determined by the processor 3100 is 2, then the first codebook index and the second codebook index corresponding to the second PMI value range Thus, in the precoding matrix set determined, the first codebook index

First precoding matrix set and first codebook index corresponding to

The second set of precoding matrices corresponding to are mutually exclusive and the first codebook index

Represents the first codebook index corresponding to n whose value is a, the first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

Optionally, in one embodiment, if the rank determined by processor 3100 is 1, W ₂ satisfies equation (5).

Optionally, in one embodiment, if the rank determined by processor 3100 is 2, W ₂ satisfies Equation (6) or Equation (7).

  Optionally, and in one embodiment, if the rank determined by processor 3100 is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is given in Table F1 or It is determined according to F2.

  Optionally, in one embodiment, if the rank determined by processor 3100 is 3 or 4, then the precoding matrix included in the codebook set corresponding to the rank has codebook indices 0 to 3 in Table G 4 One precoding matrix, four precoding matrices having codebook indexes 4 to 7 in Table G, or four precoding matrices having codebook indexes 12 to 15 in Table G.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  User equipment 3000 according to this embodiment of the invention may correspond to user equipment performing a method for transmitting a four antenna precoding matrix according to embodiments of the invention, and the above and other of the modules in user equipment 3000 It should be understood that the operations and / or functions are used to realize the corresponding steps of the method in FIG. 32, which are not further described here for the sake of brevity.

  Thus, the user equipment according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7}、{8, 9, 10, 11, 12, 13, 14, 15}、{0, 2, 4, 6, 8, 10, 12, 14}、または{1, 3, 5, 7, 9, 11, 13, 15}である。 As shown in FIG. 16, embodiments of the present invention further provide a base station 6000. Base station 6000 includes a processor 6100, a memory 6200, a bus system 6300, and a receiver 6400. Processor 6100, memory 6200, and receiver 6400 are connected by using bus system 6300, which is configured to store instructions, and processor 6100 controls receiver 6400 to receive signals. In order to execute the instructions stored by the memory 6200. The receiver 6400 is configured to receive the rank used to indicate the number of transmission layers, the first precoding matrix indicator PMI, and the second PMI sent by the user equipment, and the processor 6100 is configured to: , And configured to determine a first precoding matrix in the codebook set corresponding to the rank according to the first PMI and the second PMI, wherein the precoding matrix included in the codebook set is the first code The first PMI and the first codebook index have a first correspondence, represented by the book index and the second codebook index, and the second PMI and the second codebook index have the second correspondence. And the precoding matrix W included in the codebook set satisfies the following equation: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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}.

  Thus, with the base station according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

Optionally, in one embodiment, if the rank determined by processor 6100 is 1, then W ₂ satisfies equation (5).

Optionally, in one embodiment, if the rank determined by processor 6100 is 2, W ₂ satisfies Equation (6) or Equation (7).

であり、Aは、定数である。 Optionally, in one embodiment, 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 the second Indicated by codebook index,

And A is a constant.

  Optionally, in one embodiment, if the rank determined by processor 6100 is 1, then the precoding matrix W included in the codebook set is determined according to Table A.

  Optionally, in one embodiment, if the rank determined by processor 6100 is 2, then the precoding matrix W included in the codebook set is determined according to Table B1 or B2.

  Optionally, in one embodiment, if the rank determined by processor 6100 is 1, then the first PMI, the second PMI, the first codebook index corresponding to the first PMI, and the second PMI A second codebook index corresponding to is determined according to table C1, C2, C3 or C4.

  Optionally, in one embodiment, if the rank determined by processor 6100 is 2, then the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7} or {8, 9, 10, 11, 12, 13, 14, 15}.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 6000 according to this embodiment of the present invention may correspond to a base station performing a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention, the above and other of the modules in the base station 6000 It should be understood that the operations and / or functions are used to implement the corresponding steps of the method in FIG. 4, which are not further described here for the sake of brevity.

  Thus, with the base station according to this embodiment of the present invention, more precoding matrices applicable to uniform linear array antennas can be shown without changing the feedback mode or feedback bits, System performance may be improved and user experience may be improved, as it may also be guaranteed that the performance for applications of V.sub.2 may not be affected.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{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}、または{9, 11, 13, 15}である。 As shown in FIG. 17, an embodiment of the present invention further provides a base station 7000. Base station 7000 includes a processor 7100, a memory 7200, a bus system 7300, and a receiver 7400. The processor 7100, the memory 7200 and the receiver 7400 are connected by using a bus system 7300, the memory 7200 being configured to store instructions and the processor 7100 controlling the receiver 7400 to receive signals. In order to execute the instructions stored by the memory 7200. The receiver 7400 is configured to receive the joint coded values sent by the user equipment, and the processor 7100 sets the value of the first codebook index and the number of transmission layers according to the joint coded values. Configured to determine a rank used to indicate, a correspondence between the joint coded value and the rank, and a correspondence between the joint coded value and the first codebook index, The codebook index value of 1 corresponds to one precoding matrix set in the codebook set, the codebook set corresponds to the rank, and the precoding matrix included in the codebook set is the first codebook index And by the second codebook index Is, precoding matrix W contained in the codebook set satisfies the following equation, the W = W ₁ × W _2,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is 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 }.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

Optionally, in one embodiment, if the rank determined by processor 7100 is 1, then W ₂ satisfies equation (5).

Optionally, in one embodiment, if the rank determined by processor 7100 is 2, W ₂ satisfies Equation (6) or Equation (7).

  Optionally, in one embodiment, if the number of bits carrying the joint coded value is four, then the correspondence between the joint coded value and the rank and the joint coded value and the first codebook index The correspondence between is determined according to Table D.

  Optionally, in one embodiment, if the number of bits carrying the joint coded value is 3, the correspondence between the joint coded value and the rank and the joint coded value and the first codebook index The correspondence between is determined according to Table E.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 7000 according to this embodiment of the present invention may correspond to a base station performing a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention, the above and other modules of the base station 7000 It should be understood that the operations and / or functions are used to realize the corresponding steps of the method in FIG. 5, which are not further described here for the sake of brevity.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

およびn=0, 1, …, 15であり、
第1のコードブックインデックスは、nの1つの値に対応し、nの値の範囲は、セット{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}であり、
受信機8400によって受信されたランクが2である場合、第1のコードブックインデックスと第2のPMIの値の範囲に対応する第2のコードブックインデックスとにしたがって決定されたプリコーディングマトリックスセットにおいて、第1のコードブックインデックス

に対応する第1のプリコーディングマトリックスセットおよび第1のコードブックインデックス

に対応する第2のプリコーディングマトリックスセットは、相互に排他的であり、第1のコードブックインデックス

は、その値がaであるnに対応する第1のコードブックインデックスを表し、第1のコードブックインデックス

は、その値がa+8であるnに対応する第1のコードブックインデックスを表し、a∈{0, 1, 2, 3, 4, 5, 6, 7}である。 As shown in FIG. 18, an embodiment of the present invention further provides a base station 8000. Base station 8000 includes a processor 8100, a memory 8200, a bus system 8300, and a receiver 8400. Processor 8100, memory 8200, and receiver 8400 are connected by using bus system 8300, which is configured to store instructions, and processor 8100 controls receiver 8400 to receive signals. To execute the instructions stored by the memory 8200. The receiver 8400 is configured to receive a second precoding matrix indicator PMI sent by the user equipment, a first codebook index, and a rank used to indicate the number of transmission layers, the processor 8100 Is configured to determine a first precoding matrix in the codebook set corresponding to the rank according to the second PMI and the first codebook index, the precoding included in the codebook set being the first And the second PMI and the second codebook index have a first correspondence, and for one given first codebook index, The range of values of the second codebook index corresponding to the range of values of the second PMI is The precoding matrix W, which is a suitable subset of the value range of the codebook index of 2, and included in the codebook set, satisfies the following formula: W = W ₁ × W ₂

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
If the rank received by receiver 8400 is 2, then in the set of precoding matrices determined according to the first codebook index and the second codebook index corresponding to the second PMI value range: First codebook index

First precoding matrix set and first codebook index corresponding to

The second set of precoding matrices corresponding to are mutually exclusive and the first codebook index

Represents the first codebook index corresponding to n whose value is a, the first codebook index

Denotes a first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

Optionally, in one embodiment, if the rank determined by processor 8100 is 1, then W ₂ satisfies equation (5).

Optionally, in one embodiment, if the rank determined by processor 8100 is 2, W ₂ satisfies Equation (6) or Equation (7).

  Optionally, and in one embodiment, if the rank determined by processor 8100 is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is given in Table F1 or It is determined according to F2.

  Optionally, in one embodiment, if the rank determined by processor 8100 is 3 or 4, the precoding matrix included in the codebook set corresponding to the rank has codebook indices 0 to 3 in Table G 4 One precoding matrix, four precoding matrices having codebook indexes 4 to 7 in Table G, or four precoding matrices having codebook indexes 12 to 15 in Table G.

  It should be understood that, in this embodiment of the invention, the precoding matrix W included in the codebook set is determined according to Table A if it is determined that the rank is 1. It should be further understood that, in this embodiment of the invention, if the rank determined by the UE is 2, the precoding matrix W included in the codebook set is determined according to Table B1 or B2. is there. It should be understood that in this embodiment of the invention, the joint-coded values represent the values generated by performing joint coding of the rank and the first PMI, which is simplified Because of this, it is not described here any more.

  In this embodiment of the invention, optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI are associated Have. Optionally, the range of values of the first codebook index corresponding to the first PMI and the range of values of the second codebook index corresponding to the second PMI have an association; And the range of values of the second codebook index corresponding to H is uniquely determined according to the value and / or the range of values of the first codebook index corresponding to the first PMI.

  A base station 8000 according to this embodiment of the present invention may correspond to a base station performing a method for transmitting a four antenna precoding matrix according to an embodiment of the present invention, the above and other modules of the base station 8000 It should be understood that the operations and / or functions are used to implement the corresponding steps of the method in FIG. 6, which are not further described here for the sake of brevity.

  Thus, the base station according to this embodiment of the present invention may improve system performance and improve the user experience by preventing problems where the precoding matrix is repeated after subsampling.

  One skilled in the art may recognize that the unit and algorithm steps may be realized by electronic hardware, computer software, or a combination thereof, in combination with the examples described in the embodiments disclosed herein. . In order to clearly describe the compatibility between hardware and software, the above has generally described the configuration and steps of each example according to function. Whether the functions are performed by hardware or software depends on the particular application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functionality for each particular application, but the implementation should not be considered beyond the scope of the present invention.

  It will be appreciated by those skilled in the art that, for the purpose of a brief and concise description, the detailed working process of the above system, apparatus and unit may be referred to the corresponding process in the embodiment of the above method, Will not be described again here.

  It should be understood that the disclosed systems, apparatus and methods may be implemented in other manners in some embodiments provided herein. For example, the described apparatus embodiment is merely exemplary. For example, the division of units is merely a division of logical functions, and may be another division in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual coupling, or direct coupling, or communication connection may be realized by several interfaces. The indirect coupling or communication connection between the devices or units may be realized electronically, mechanically or in other forms.

  Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, or are located at one location Or may be distributed over multiple network units. Some or all of the units may be selected according to the actual needs to achieve the purpose of the solution of the embodiments of the present invention.

  In addition, the functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may physically exist alone, or two or more units may be integrated into one unit. Ru. The integrated unit may be realized in the form of hardware or in the form of a software functional unit.

  If the integrated unit is embodied in the form of a software functional unit and sold or used as a separate product, the integrated unit may be stored on a computer readable storage medium. Based on such an understanding, the technical solution of the present invention, or the part contributing to the prior art, or all or part of the technical solution may be realized in the form of a software product. The software product is stored in a storage medium, and may be a computer device (which may be a personal computer, server or network device) to perform all or part of the method steps described in the embodiments of the present invention. Contains some instructions to order. The storage medium may be any medium capable of storing program codes, such as a USB flash drive, a removable hard disk, a read only memory (ROM), a random access memory (RAM), a magnetic disk, Or include an optical disc.

  The above descriptions are merely specific embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification or substitution readily understood by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be under the control of the protection scope of the claims.

10 ways
20 ways
30 ways
60 ways
70 ways
80 ways
100 user equipment
110 decision module
120 delivery module
200 user equipment
210 decision module
220 Send module
300 user equipment
310 decision module
320 Send module
600 base stations
610 receiver module
620 decision module
700 base stations
710 receiver module
720 decision modules
800 base stations
810 receiver module
820 Decision Module
1000 user equipment
1100 processor
1200 memory
1300 bus system
1400 transmitter
2000 user equipment
2100 processor
2200 memory
2300 bus system
2400 transmitter
3000 user equipment
3100 processor
3200 memory
3300 bus system
3400 transmitter
6000 base stations
6100 processor
6200 memory
6300 bus system
6400 receiver
7000 base station
7100 processor
7200 memory
7300 bus system
7400 receiver
8000 base stations
8100 processor
8200 memory
8300 bus system
8400 receiver

Claims (11)

A method for transmitting indication information of a four antenna precoding matrix, comprising:
Determining the rank used to indicate the number of transmission layers;
Determining a first precoding matrix in a codebook set corresponding to the rank, wherein the precoding matrix included in the codebook set comprises a first codebook index and a second codebook index Representing, determining steps;
Determining a second precoding matrix indicator PMI used to indicate the first precoding matrix, wherein the second PMI and the second codebook index have a first correspondence relationship And a range of values of the second codebook index corresponding to the second PMI corresponding to a range of values of one given first codebook index is the second codebook index Determining a true subset of a range of values, the first correspondence relationship being a functional relationship or a mapping relationship;
Sending to the base station the second PMI used to indicate the first precoding matrix.
The first codebook index, the second codebook index, and the PMI do not exceed 4 bits.
The precoding matrix W included in the codebook set satisfies the following equation, W = W ₁ × W ₂ , and W ₁ is included in a first precoding matrix set corresponding to the first codebook index. W ₂ represents a _second precoding matrix included in a second precoding matrix set corresponding to the second codebook index,

And n = 0, 1, ..., 15, the first codebook index corresponds to one value of n and the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
When it is determined that the rank is 2, W ₂ has the following formula:

, E _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4}, B is a constant,
A precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI if the rank is determined to be 2. Where the first set of precoding matrices is the first codebook index

, And the second set of precoding matrices is the first codebook index

Corresponding to the first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Represents the first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}. If the rank is determined to be 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is determined according to Table F1 or F2,

The _{method according to} claim 1, wherein I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. A method for receiving indication information of a four antenna precoding matrix, comprising:
Receiving a second precoding matrix indicator PMI sent by the user equipment, a first codebook index, and a rank used to indicate the number of transmission layers;
Determining a first precoding matrix in a codebook set corresponding to the rank according to the second PMI and the first codebook index, wherein the precoding matrix included in the codebook set is , Represented by the first codebook index and the second codebook index, the second PMI and the second codebook index have a first correspondence, and one given The range of values of the second codebook index corresponding to the second PMI corresponding to the range of values of 1 codebook index is a true subset of the range of values of the second codebook index, Determining the first correspondence relationship is a functional relationship or a mapping relationship,
The first codebook index, the second codebook index, and the PMI do not exceed 4 bits.
The precoding matrix W included in the codebook set satisfies the following equation, W = W ₁ × W ₂ , and W ₁ is included in a first precoding matrix set corresponding to the first codebook index. W ₂ represents a _second precoding matrix included in a second precoding matrix set corresponding to the second codebook index,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the received rank is 2, W ₂ has the following formula:

, E _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4}, B is a constant,
If the received rank is 2, then in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. , First precoding matrix set, first codebook index

, And the second set of precoding matrices is the first codebook index

Corresponding to the first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Represents the first codebook index corresponding to n whose value is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}. If the received rank is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is determined according to Table F1 or F2,

The _{method according to} claim 3, wherein I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. User equipment,
Configured to determine a rank used to indicate the number of transmission layers, and further configured to determine a first precoding matrix in a codebook set corresponding to the rank and included in the codebook set The precoding matrix to be represented is determined by a first codebook index and a second codebook index to determine a second precoding matrix indicator PMI used to indicate the first precoding matrix , And the second PMI and the second codebook index have a first correspondence, and the second corresponding to a range of values of one given first codebook index. The range of values of the second codebook index corresponding to the PMI of A decision module which is a true subset of a range of values of the book index, and the first correspondence relationship is a functional relationship or a mapping relationship;
A sending module used to indicate the first precoding matrix and configured to send the second PMI determined by the determining module to a base station;
The first codebook index, the second codebook index, and the PMI do not exceed 4 bits.
The precoding matrix W included in the codebook set satisfies the following equation, W = W ₁ × W ₂ , and W ₁ is included in a first precoding matrix set corresponding to the first codebook index. W ₂ represents a _second precoding matrix included in a second precoding matrix set corresponding to the second codebook index,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If the rank determined by the determination module is 2, W ₂ has the following formula:

, E _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4}, B is a constant,
If the rank determined by the determination module is 2, then the pre-determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. In the coding matrix set, the first precoding matrix set has a first codebook index

, And the second set of precoding matrices is the first codebook index

Corresponding to the first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

Is the first codebook index corresponding to n, the value of which is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7} user equipment. If the rank determined by the determination module is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is according to Table F1 or F2 Determined

The user equipment according to claim 5, wherein I _PMI2 represents the second PMI, i ₁ represents the first codebook index, and i ₂ represents the second codebook index. A base station,
A receiving module for receiving a second precoding matrix indicator PMI sent by the user equipment, a first codebook index, and a rank used to indicate the number of transmission layers;
Determining a first precoding matrix in a codebook set corresponding to the rank received by the receiving module according to the second PMI received by the receiving module and the first codebook index; The precoding matrix included in the codebook set is represented by the first codebook index and the second codebook index, and the second PMI and the second codebook index have a first correspondence. A range of values of the second codebook index corresponding to the second PMI having a relationship and corresponding to a range of values of one given first codebook index is the second codebook A true subset of the range of index values, and the first correspondence relationship is a functional relationship or a map And a determination module, which is a ping relationship,
The first codebook index, the second codebook index, and the PMI do not exceed 4 bits.
The precoding matrix W included in the codebook set satisfies the following equation, W = W ₁ × W ₂ , and W ₁ is included in a first precoding matrix set corresponding to the first codebook index. W ₂ represents a _second precoding matrix included in a second precoding matrix set corresponding to the second codebook index,

And n = 0, 1, ..., 15, and
The first codebook index corresponds to one value of n, the range of values of n is set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15},
If it is determined that the rank received by the receiving module is 2, then W ₂ has the formula

, E _i represents a column vector with 4 × 1 dimensions, the ith element in e _i is 1 and all other elements are 0, iε {1, 2, 3, 4}, B is a constant,
If the received rank is 2, then in the precoding matrix set determined according to the first codebook index and the second codebook index corresponding to the range of values of the second PMI. , First precoding matrix set, first codebook index

, And the second set of precoding matrices is the first codebook index

Corresponding to the first codebook index

Represents a first codebook index corresponding to n whose value is a, said first codebook index

A base station representing a first codebook index corresponding to n, the value of which is a + 8, where aε {0, 1, 2, 3, 4, 5, 6, 7}. If the rank received by the receiving module is 2, then the interrelationship between the second PMI, the first codebook index, and the second codebook index is according to Table F1 or F2 Determined

I _PMI2 represents the second PMI, i ₁ denotes the first codebook index, i ₂ denotes the second codebook index, a base station according to claim 7.   A computer readable storage medium having a program recorded thereon, wherein the program causes a computer to execute the method according to claim 1 or 2.   A computer readable storage medium having a program recorded thereon, wherein the program causes a computer to execute the method according to claim 3 or 4. A communication system,
A user equipment and a base station in communication with each other, the user equipment performing the method according to claim 1 or 2, and the base station performing the method according to claim 3 or 4.
Communications system.

Images