WO2014067460A1

WO2014067460A1 - Method, system and device of transmitting pre-coding indication information and determining pre-coding matrix

Info

Publication number: WO2014067460A1
Application number: PCT/CN2013/086232
Authority: WO
Inventors: 高秋彬
Original assignee: 电信科学技术研究院
Priority date: 2012-10-29
Filing date: 2013-10-30
Publication date: 2014-05-08
Also published as: CN103795450B; CN103795450A

Abstract

The present application relates to the technical field of wireless communication, especially to a method, system and device of transmitting pre-coding indication information and determining pre-coding matrix, used for solving the problem of performance decline caused by directly applying a codebook to the technique of three-dimensional beam forming/pre-coding. The embodiments of the method of the present application includes: user equipment determines and transmits the first pre-coding indication information, the second pre-coding indication information and the third pre-coding indication information, wherein these indication information correspond to the pre-coding matrix, and the pre-coding matrix is equal to the functional matrix of the first component pre-coding matrix which is a diagonal matrix, the second component pre-coding matrix which is a diagonal matrix and the third component pre-coding matrix which is composed of beam circumrotation vectors equaling to the Kronecker product of two vectors. By applying the solutions of the embodiments of the present application, the performance of the technique of three-dimensional beam forming/pre-coding can be improved.

Description

Method, system and device for transmitting precoding indication information and determining precoding matrix The application claims to be submitted to the Chinese Patent Office on October 29, 2012, the application number is 201210421221 .7, and the invention name is

The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the field of wireless communication technologies, and in particular, to a method, system, and device for pre-transmitting coding indication information and determining a precoding matrix. BACKGROUND OF THE INVENTION The LTE (Long Term Evolution) Rel-8 (Release 8) system introduces closed-loop precoding techniques to improve spectral efficiency. Closed-loop precoding first requires that both the base station and the user equipment maintain a set of the same precoding matrix, called a codebook. After estimating the channel information according to the common pilot of the cell, the user equipment selects a precoding matrix from the codebook according to a certain criterion. The criteria chosen may be to maximize mutual information, maximize output signal to interference and noise ratio, and the like. The user equipment feeds the index of the selected precoding matrix in the codebook to the base station through the uplink channel, and the index is recorded as a PMI (Pre-coding Matrix Indicator). The base station can determine the precoding matrix that should be used for the user equipment from the received index value. The precoding matrix reported by the user equipment can be regarded as a quantized value of channel state information.

In existing cellular systems, the base station antenna arrays are generally horizontally arranged as shown in Figures 1 and 2. The base station transmitter beam can only be adjusted in the horizontal direction, while the vertical direction is a fixed downtilt angle for each user. Therefore, various beamforming/precoding techniques are performed based on the horizontal channel information. In fact, since the wireless signal is three-dimensionally propagated in space, the method of fixing the downtilt angle does not optimize the performance of the system. Beam adjustment in the vertical direction is important for system performance improvement. With the development of antenna technology, active antennas capable of independently controlling each array have appeared in the industry, as shown in Figs. 3A and 3B. Using this antenna array makes dynamic adjustment of the beam in the vertical direction possible. The three-dimensional beamforming/precoding in the FDD system relies on the channel state information reported by the user equipment. One possible implementation is to use the codebook-based reporting method that has been used since the LTE Rel-8 system. However, the existing codebooks are designed for horizontal beamforming/precoding, and direct application to three-dimensional beamforming/precoding techniques results in performance degradation.

In summary, the current codebook is designed for horizontal beamforming/precoding, and direct application to three-dimensional beamforming/precoding techniques results in performance degradation. SUMMARY OF THE INVENTION The present invention provides a method, system, and device for transmitting precoding indication information and determining a precoding matrix, which are used to solve the problem that the current codebook is designed for horizontal beamforming/precoding, and is directly applied. The problem of performance degradation can be caused by three-dimensional beamforming/precoding techniques.

A method for transmitting precoding indication information provided by an embodiment of the present application includes:

The user equipment determines the first precoding indication information, the second precoding indication information, and the third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information correspond to the precoding matrix The precoding matrix is equal to a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, where the first component precoding matrix is a diagonal matrix; The coding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam rotation vector being equal to the Kronecker product of two vectors

The user equipment sends first precoding indication information, second precoding indication information, and third precoding indication information to the network side.

A preferred implementation manner of the user equipment determining the first precoding indication information, the second precoding indication information, and the third precoding indication information is:

The user equipment selects a first component precoding matrix from the first component precoding matrix set, and determines first precoding indication information corresponding to the selected first component precoding matrix, and from the second component precoding matrix set. Selecting a second component precoding matrix, determining second precoding indication information corresponding to the selected second component precoding matrix, and selecting a third component precoding matrix from the third component precoding matrix set, and determining the selected The third precoding indication information corresponding to the three component precoding matrix.

Further, the user equipment may determine, according to a preset correspondence between the preset first component precoding matrix and the first precoding indication information, the first precoding indication information corresponding to the first component precoding matrix, and the data Determining, by a preset correspondence between the second component precoding matrix and the third precoding indication information, determining second precoding indication information corresponding to the second component precoding matrix, and according to a preset third component precoding matrix and And determining, by the third precoding indication information, third precoding indication information corresponding to the third component precoding matrix.

Another preferred implementation manner of the user equipment determining the first precoding indication information, the second precoding indication information, and the third precoding indication information may be:

Determining, by the user equipment, at least one precoding matrix, and determining, according to the correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix, determining that at least one precoding matrix corresponds to First precoding indication information, second precoding indication information, and third precoding indication information;

The user equipment selects a first precoding indication information, a second precoding indication information, and a third precoding from the determined first precoding indication information, the second precoding indication information, and the third precoding indication information. Instruction letter Based on any of the foregoing method embodiments, preferably, the first component precoding matrix is: or

Where ^w i is the first component precoding matrix; ^u v is a beamforming vector whose dimension is ^ ¹ ; B is

D XDv diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U, whose elements on the diagonal are equal to the elements of vector U.

Further, U _v may be an element of a set {U _v , _q :q = 0,l,...,N _v -1} formed by a beamforming vector, U _v =U _v , _n , 0≤ n ≤ N _v — 1; N _v is a positive integer.

Preferably, the second component precoding matrix is &8(1 ₁₁ ) or (^8(8 1; ₁₁ ); wherein ^U H is a beamforming vector having a dimension of 1 1; A is a D _H xD _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U.

Further, ^U H may be an element in the set {U _H , _p : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, U _H =U _H , _k , o≤ k ≤ N _H -l, N _H is a positive integer.

Based on any of the foregoing method embodiments, preferably, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

its

Where w ₃ is the third component precoding matrix; is a complex scalar with a modulus of 1; is a beamforming vector whose dimension is

D' is a positive integer and M is a power normalization coefficient.

Based on any of the foregoing method embodiments, preferably, the precoding matrix is:

W = (W _X ® W ₂ ) - W ₃ - where w is a precoding matrix; is a first component precoding matrix; w ₂ is a second component precoding matrix; w ₃ is a third component precoding matrix.

A method for determining a precoding matrix provided by an embodiment of the present application includes:

The network side device receives first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment;

Determining, by the network side device, the precoding matrix according to the first precoding indication information, the second precoding indication information, and the third precoding indication information;

The first precoding indication information, the second precoding indication information, and the third precoding indication information are corresponding to a precoding matrix, where the precoding matrix is equal to the first component precoding matrix, the second component precoding matrix, and the third a function matrix of a component precoding matrix, wherein the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; and the third component precoding matrix is composed of a beam rotation vector, The beam rotation vector is equal to the Kronecker product of the two vectors.

An implementation manner of the network side device determining the precoding matrix may be:

Determining, by the network side device, a first component precoding matrix corresponding to the first precoding indication information, and determining a second component precoding matrix corresponding to the second precoding indication information, and determining a third corresponding to the third precoding indication information Component precoding matrix;

The network side device uses a product of a first component precoding matrix, a second component precoding matrix, and a third component precoding matrix as a precoding matrix.

Preferably, the determining, by the network side device, the first component precoding matrix corresponding to the first precoding indication information, the method includes: the network side device according to the preset first component precoding matrix and the first precoding indication information Corresponding relationship, determining a first component precoding matrix corresponding to the received first precoding indication information;

Determining, by the network side device, the second component precoding matrix corresponding to the second precoding indication information, the method includes: the network side device according to the correspondence between the preset second component precoding matrix and the second precoding indication information, Determining a second component precoding matrix corresponding to the received second precoding indication information;

The determining, by the network side device, the third component precoding matrix corresponding to the third precoding indication information, the network side device, according to the corresponding relationship between the preset third component precoding matrix and the third precoding indication information, Determining a third component precoding matrix corresponding to the received second precoding indication information.

Based on any of the foregoing network side method embodiments, preferably, the first component precoding matrix is:

Diag(U _v ) 0 Ί

w _{1 =}

- 0 diag(U _v )J ^; or diag(U _v ) 0 _

0 diag(BU _v )"; where is the first component precoding matrix; ^u v is the beamforming vector, the dimension is ¹ ^ ""¹; B is D XDv diagonal matrix; I is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U.

Based on the foregoing any network side method embodiment, preferably, the second component precoding matrix is & ₁₁ or diag (AU _H );

Where ^U H is a beamforming vector with a dimension of 1 1; A is a D _H xD _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U, diagonally The element above is equal to the element of vector U.

Further, ^U H may be an element in the set {U _H , _P : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, ^U H ^=U H,k , 0< k ≤ N _H -l, N _H is a positive integer.

Preferably, the third component precoding matrix is a product of a (2M _H M _V ) X r dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

Wherein, W ₃ is a third component precoding matrix; a complex scalar V having a modulus of 1 is a beamforming vector whose dimension is ^D V ^Xl , ^X H is a beamforming vector whose dimension is ^D H ^Xl , ^{1 =1} '-' ^Γ , D Ή and Μ are power normalization coefficients. Another implementation manner in which the network side device determines the precoding matrix may be:

Determining, by the network side device, the received first precoding indication information according to the correspondence between the preset first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix And a precoding matrix corresponding to the second precoding indication information and the third precoding indication information.

A user equipment for transmitting precoding indication information provided by the embodiment of the present application includes:

a first determining module, configured to determine first precoding indication information, second precoding indication information, and third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information Corresponding to the precoding matrix, the precoding matrix is equal to a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, where the first component precoding matrix is a diagonal matrix; The second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam rotation vector being equal to the Kronecker product of two vectors And a sending module, configured to send first precoding indication information, second precoding indication information, and third precoding indication information to the network side.

Preferably, the first determining module is specifically configured to:

Selecting a first component precoding matrix from the first component precoding matrix set, and determining first precoding indication information corresponding to the selected first component precoding matrix, and selecting a second component from the second component precoding matrix set Precoding the matrix, and determining second precoding indication information corresponding to the selected second component precoding matrix, and selecting a third component precoding matrix from the third component precoding matrix set, and determining the selected third component precoding The third precoding indication information corresponding to the matrix.

Based on the preferred embodiment, the first determining module may be specifically configured to:

Determining, according to a preset correspondence between the first component precoding matrix and the first precoding indication information, first precoding indication information corresponding to the first component precoding matrix, and according to a preset second component precoding matrix Corresponding relationship with the third precoding indication information, determining second precoding indication information corresponding to the second component precoding matrix, and according to a correspondence between the preset third component precoding matrix and the third precoding indication information, Determining third precoding indication information corresponding to the third component precoding matrix.

Preferably, the first determining module is specifically configured to:

Determining at least one precoding matrix, and determining a first preamble corresponding to the at least one precoding matrix according to the correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix Encoding indication information, second precoding indication information, and third precoding indication information; selecting one first precoding indication information from the determined first precoding indication information, second precoding indication information, and third precoding indication information And a second precoding indication information and a third precoding indication information.

Based on any of the foregoing user equipment embodiments, preferably, the first component precoding matrix is:

or

0 diag(BU _v )J ^; where ^w i is the first component precoding matrix; ^u v is a beamforming vector whose dimension is ^ ¹ ; B is a °v ^{x D} diagonal matrix; Dy is a positive integer; diag (U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Further, U _v may be an element of a set {U _v , _q : q = 0, l, ..., N _v -1} formed by a beamforming vector, U _v =U _v , _n , 0≤ n ≤ N _v — 1 ; N _v is a positive integer. Preferably, the second component precoding matrix is &8(1 ₁₁ ) or (^8(8 1; ₁₁ ); wherein ^U H is a beamforming vector having a dimension of 1 1; A is a D _H xD _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U.

Further, ^U H may be an element in the set {U _H , _P : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, ^U H ^=U H,k , 0< k ≤ N _H -l, N _H is a positive integer. Preferably, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

Where w ₃ is a third component precoding matrix; ^ is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D v ^XL , ^X H is a beamforming vector whose dimension is ^D H ^Χ1 , l =1"··,ϊ, D _H and

^D v is a positive integer and M is a power normalization coefficient.

Based on any user equipment embodiment, preferably, the precoding matrix is:

W = (W _X ® W ₂ ) - W ₃ ; where W is a precoding matrix; is a first component precoding matrix; w ₂ is a second component precoding matrix; w ₃ is a third component precoding matrix.

Based on the same inventive concept as the method, the embodiment of the present invention further provides a user equipment, including a processor and a radio frequency unit.

The processor is configured to determine first precoding indication information, second precoding indication information, and third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information Corresponding to the precoding matrix, the precoding matrix is equal to a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, where the first component precoding matrix is a diagonal matrix; The second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam rotation vector being equal to the Kronecker product of two vectors

The radio unit is configured to send first precoding indication information, second precoding indication information, and third precoding indication information to the network side. A network side device for determining a precoding matrix provided by the embodiment of the present application includes:

a receiving module, configured to receive first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment;

a second determining module, configured to determine a precoding matrix according to the first precoding indication information, the second precoding indication information, and the third precoding indication information;

Preferably, the second determining module is specifically configured to:

Determining a first component precoding matrix corresponding to the first precoding indication information, and determining a second component precoding matrix corresponding to the second precoding indication information, and determining a third component precoding matrix corresponding to the third precoding indication information; A product of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix is used as a precoding matrix.

Based on this, the second determining module may be specifically configured to:

Determining, according to a correspondence between the preset first component precoding matrix and the first precoding indication information, a first component precoding matrix corresponding to the received first precoding indication information; according to a preset second component pre Corresponding relationship between the coding matrix and the second precoding indication information, determining a second component precoding matrix corresponding to the received second precoding indication information; according to the preset third component precoding matrix and the third precoding indication information Corresponding relationship, determining a third component precoding matrix corresponding to the received second precoding indication information.

Based on any of the foregoing network side device embodiments, preferably, the first component precoding matrix is: or

Diag(U _v ) 0

L 0 diag(BU _v )", where ^W i is a first component precoding matrix; ^U v is a beamforming vector whose dimension is ^ ¹ ; B is

°v ^{x D} v diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Further, U _v may be one of a set of beamforming vectors {U _v , _q : q = 0, l, ..., N _v -1} Element, U _v =U _v , _n , 0≤n≤N _v — 1; N _v is a positive integer. Preferably, the second component precoding matrix is diag(U _H ) or diag(AU _H ); wherein ^U H is a beamforming vector having a dimension of 1 1; D _H xD _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Further, ^U H may be an element in the set {U _H , _p : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, ^U H ^=U H,k , o≤ k ≤ N _H -l, N _H is a positive integer. Preferably, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

Where W ₃ is a third component precoding matrix; is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D v ^XL , ^X H is a beamforming vector whose dimension is ^D H ^XL , i = l, ""r , D _H and a 'V are positive integers, and M is the power normalization coefficient. Preferably, the second determining module is specifically configured to:

Determining the received first precoding indication information and the second precoding indication information according to the correspondence between the preset first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix And a precoding matrix corresponding to the third precoding indication information.

Based on the same inventive concept as the method, the embodiment of the present invention further provides a network side device, including a processor and a radio frequency unit.

The radio unit is configured to receive first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment;

The processor is configured to: determine, according to the first precoding indication information, the second precoding indication information, and the third precoding indication information, a precoding matrix;

The first precoding indication information, the second precoding indication information, and the third precoding indication information are corresponding to a precoding matrix, where the precoding matrix is equal to the first component precoding matrix, the second component precoding matrix, and the third Component pre-editing a function matrix of a code matrix, wherein the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam The rotation vector is equal to the Kronecker product of the two vectors.

A system for determining a precoding matrix provided by an embodiment of the present application includes:

The user equipment is configured to determine the first precoding indication information, the second precoding indication information, and the third precoding indication information, and send the first precoding indication information, the second precoding indication information, and the third precoding indication to the network side. Information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information correspond to a precoding matrix, where the precoding matrix is equal to the first component precoding matrix, the second component precoding matrix, and the a function matrix of a three-component precoding matrix, the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; and the third component precoding matrix is composed of a beam rotation vector, The beam rotation vector is equal to the Kronecker product of two vectors

a network side device, configured to receive first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment, according to the first precoding indication information, the second precoding indication information And the third precoding indication information, determining the precoding matrix.

In this embodiment, the user equipment determines the first precoding indication information, the second precoding indication information, and the third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information are Corresponding to the precoding matrix, the precoding matrix is equal to a function matrix of the first component precoding matrix and the second component precoding matrix, the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; The third component precoding matrix consists of a beam rotation vector equal to the Kronecker product of the two vectors. Since the constructed precoding matrix is more closely matched to the spatial channel of the three-dimensional beamforming, the performance of the three-dimensional beamforming/precoding technique is improved. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a horizontally arranged dual-polarized antenna in the background art;

2 is a schematic diagram of a horizontally arranged linear array antenna in the background art;

3A is a schematic diagram of a two-dimensionally arranged dual-polarized antenna in the background art;

3B is a schematic diagram of a linear array antenna arranged vertically in two dimensions in the background art;

4 is a schematic structural diagram of a system for determining a precoding matrix according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of user equipment in a system for determining a precoding matrix according to an embodiment of the present application;

6 is a schematic structural diagram of a network side device in a system for determining a precoding matrix according to an embodiment of the present application;

7 is a schematic flowchart of a method for transmitting precoding indication information according to an embodiment of the present application;

FIG. 8 is a schematic flowchart of a method for determining a precoding matrix according to an embodiment of the present application. The user equipment determines the first precoding indication information, the second precoding indication information, and the third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding The indication information corresponds to the precoding matrix, the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, and the beam rotation vector is equal to two vectors Kronecker (Kronic). Since the constructed precoding matrix is more closely matched to the spatial channel of the three-dimensional beamforming, the performance of the three-dimensional beamforming/precoding technique is improved.

The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

In the following description, the implementation of the cooperation between the network side and the user equipment side will be described first. Finally, the implementations from the network side and the user equipment side will be described separately, but this does not mean that the two must be implemented together. In fact, When the network side is implemented separately from the user equipment side, the problems existing on the network side and the user equipment side are also solved, but when the two are combined, a better technical effect is obtained.

As shown in FIG. 4, the system for determining a precoding matrix in the embodiment of the present application includes: a user equipment 10 and a network side device 20.

The user equipment 10 is configured to determine first precoding indication information, second precoding indication information, and third precoding indication information, and send first precoding indication information and second precoding indication information to the network side, where the first The precoding indication information, the second precoding indication information, and the third precoding indication information correspond to a precoding matrix, and the precoding matrix is equal to a function of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix a matrix, the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, and the beam rotation vector is equal to a Kronecker product of the two vectors;

The network side device 20 is configured to receive the first precoding indication information, the second precoding indication information, and the third precoding indication information from the user equipment 10 according to the first precoding indication information, the second precoding indication information, and The third precoding indication information determines a precoding matrix.

In the implementation, there are many ways for the user equipment 10 to determine the first precoding indication information, the second precoding indication information, and the third precoding indication information, and the following are listed:

In a first mode, the user equipment 10 selects a first component precoding matrix from the first component precoding matrix set, and determines a first precoding indication information corresponding to the selected first component precoding matrix, and a second component precoding matrix. Selecting a second component precoding matrix in the set, determining second precoding indication information corresponding to the selected second component precoding matrix, and selecting a third component precoding matrix from the third component precoding matrix set, and determining the selection The third precoding indication information corresponding to the third component precoding matrix.

Specifically, the user equipment 10 estimates each antenna port to the user according to the pilot signal sent by the network side device 20. a channel of device 10, wherein each antenna port corresponds to one or more physical antennas;

Then, the user equipment 10 selects a first component precoding matrix from the first component precoding matrix set according to the estimated channel, and selects a second component precoding matrix from the second component precoding matrix set, and from the third A third component precoding matrix is selected in the set of component precoding matrices.

Specifically, the user equipment determines, according to a preset correspondence between the preset first component precoding matrix and the first precoding indication information, the first precoding indication information corresponding to the first component precoding matrix, and the preset according to the preset Corresponding relationship between the second component precoding matrix and the third precoding indication information, determining second precoding indication information corresponding to the second component precoding matrix, and according to a preset third component precoding matrix and a third pre Corresponding relationship of the coding indication information, determining third precoding indication information corresponding to the third component precoding matrix.

The correspondence between the component precoding matrix and the precoding indication information may be set as needed. In the implementation, the correspondence may be specified in the protocol; it may also be signaled by the higher layer.

Wherein, the first component precoding matrix can be determined by a method of maximizing the mutual information amount or maximizing the output signal to interference and noise ratio or maximizing the output energy. The method for determining the maximum output energy is:

W _l = arg max II II ² where ^W i is a first component precoding matrix, <^ is a set of possible first component precoding matrices, and _H1 is a part of the channel matrix of the network side device 20 to the user equipment 10 Specifically, it is a portion corresponding to the first component precoding matrix, for example, a channel on one column of antennas in the vertical direction.

The second component precoding matrix can be determined by a method of maximizing the amount of mutual information or maximizing the output signal to interference and noise ratio or maximizing the output energy. The method for determining the maximum output energy is:

W ₂ = arg max II H ₂ V II ²

VsC _2, where W ₂ is a second component precoding matrix, C ₂ is a set of possible second component precoding matrices, and H ₂ is a part of a channel matrix of the network side device 20 to the user equipment 10, specifically A portion corresponding to the second component precoding matrix, such as a channel on one row of antennas in the horizontal direction.

The third component precoding matrix can be determined by a method of maximizing the amount of mutual information or maximizing the output signal to interference and noise ratio or maximizing the output energy. The method for determining the maximum output energy is:

W ₃ = arg max II H (W) ® W ₂ ) V II ² where W ₃ is a third component precoding matrix, C ₃ is a set of possible third component precoding matrices, and H is a network side device 20 To the channel matrix of the user equipment 10, ^ is the determined first component precoding matrix, and w ₂ is the determined second component precoding matrix.

For the first mode, the user equipment 10 sets the first precoding indication information, the second precoding indication information, and the third pre-editing When the code indication information is transmitted to the network side device 20 through the uplink channel, the first precoding indication information, the second precoding indication information, and the third precoding indication information may be reported at different times, with different time granularity and frequency domain. Reporting granularity; it can also be reported at the same time.

In an implementation, the first component precoding matrix of the embodiment of the present application is a block diagonal matrix, and the first component precoding matrix is one of Equation 1 and Formula 2:

or

Where ^w i is the first component precoding matrix; ^u v is the beamforming vector, the dimension is ^ ¹ ; B is the °v ^xD diagonal matrix, the value can be a function, or take a fixed value; ° is positive Integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U.

The first component precoding matrix set in the first method is composed of a first component precoding matrix in the first formula and the second formula.

Preferably, U _v is an element of the set {U _v , _q :q = 0,l,...,N _v -1} formed by the beamforming vector, U _v =U _v , _n , 0≤ n ≤ N _v — 1; N _v is a positive integer. It can be part of a DFT vector or a DFT (Discrete Fourier Transform) vector, such as the first ^U v line taken from the L-point DFT vector, ie! _ ^u _V , _n ”i ^=e

_{l = i, '", Dy-} 1. superior, ^{L = N} V. If ^U V B is a function, denoted with ^U V ^Bn, ^{n-correspond,} the

[ ^B _n ] _U ^=e ' or [Bn] _U = vector in the Grassmanian codebook. The Grassmanian codebook is a set of vectors or matrices. The selection principle of the set elements is to maximize the minimum distance of any two elements in the set. The specific i ^u v'q · q - ⁰ Ί"", ^Ν ν - is A _Grassmanian codebook whose number of elements in the E-dimensional vector space is N _v .

{U _v 'q - q - ⁰ '1"", the elements in ^N v can include both the DFT vector and the Grassmanian vector, for example, half is the DFT vector and the other half is taken from the Grassmanian codebook. In an implementation, the second component precoding matrix of the embodiment of the present application is diag(U _H ) or diag(AU _H ); wherein, ^U H is a beamforming vector whose dimension is 1 1; A is D _H xD _H A diagonal matrix, which can be a function of ¹ ; 1^, or a fixed value; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U, whose elements on the diagonal are equal to the vector U Elements. Preferably, ^U H is an element in the set {U _H ,p: ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector,

^{^{U H = U Hk, 0 <}} k≤N H -l, N H is a positive integer.

^U H, ^k can be part of a DFT vector or a DFT vector, such as the first D _H line taken from the L-point DFT vector,

H. in case

J ~ "^ ... , —J—

A function of A, corresponding to ¹ ^ and ^H ' ^k , can make [AJu = ^{e L} or [4] _u = ^e L .

^U H,k can also be a vector in the Grassmanian codebook. The Grassmanian codebook is a collection of vectors or matrices. The selection principle of the set elements is to maximize the minimum distance between any two elements in the set.

{ ^U H'P · P = ^ ¹ '-' ^N H— is a Grassmanian codebook whose number of elements in the D _H -dimensional vector space is ^N H . The elements in i ^U H'p · P― 0,1"", N _H 1} can include both DFT vectors and Grassmanian vectors, for example, half is a DFT vector, and the other half is taken from a Grassmanian codebook. In implementation, the third component precoding matrix is ( ^2M H ^M V) ^{X : the product of the r} -dimensional matrix and the power normalization coefficient, r is the number of columns of the precoding matrix; and the third component precoding matrix is:

X ¹

Where w ₃ is the third component precoding matrix; is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D V ^{X l} , ^X H is a beamforming vector whose dimension is ^D H ^Xl , ^{1 =1} '-' ^Γ , ^Dh and

^D v is a positive integer and M is a power normalization coefficient. Used for phase adjustment between two sets of antennas. If ^Χ ^ is a horizontal beamforming adjustment vector, its function is to fine-tune the horizontal beam formed by ^U H , which is a vertical beam shaping adjustment vector, which is used to fine-tune the vertical beam formed by ^U v .

Specifically, the third component precoding matrix \¥ ₃ is taken from a set, and the third precoding indication information corresponds to one element in the set. For example, for the set constituted codebook r = l, W ₃ is

Xy, _k ® k = 0,l,...,M _v -l;n = 0,l,...,M _H -l;a = l,-l,e ² ,e ²

aXv _k ® X; χΐ _l _

^V , ^k is taken from a predefined set of vectors ^{Xv , ^{k : k = ()} , ¹ ,..., ^Mv - ^l} , specifically Grissmanian

+. ^Ki ki

1 J ² ^— ₁ - 2π—

A vector or DFT vector, such as ^[X V' ^{k]1 = C} or ^[X v, ^{k]i =CL} , can also be a combination of a Grassmanian vector and a DFT vector. ^X H' ⁿ is taken from a predefined set of vectors { ^ΧΗ ' ^η : ¹¹ =. , ¹ ,..., ^Μ Η-1 } ,

"X ¹ 1 - QL can be a Grassmanian vector or a DFT vector, such as ^LH ' ^nJi ~ or

Ni

"X ¹ "I = e

^LH ' ^nJi ~ , can also be a combination of a Grassmanian vector and a DFT vector.

Generally, for a codebook of rank r, the third component precoding matrix is taken from a set, and the elements in the set are

Prime has a form

^r v ^H ”, where ^Λγ and people! ¹ can be a Grassmanian vector

The ki or DFT vector can also be a combination of a Grassmanian vector and a DFT vector. For example ^[Xv , ^{k]i = Q} or

Ki . ki ki t -) 2π — _t } 2π — —) 2π — ^[X = ^{e L} , [ ^X ^ ^=e ' or [3⁄4, = ^{6 L} , k ^z

a _t e{e ^ζ : ζ = 0,1,...,Ζ-1} t=l,...,r where _L is the number of points of the _DFT . Preferably, _L = 2 or 4 or 8 or 16 or 32 or 64. It can also be a mixture of Grassmanian vectors and DFT vectors. The third precoding indication information corresponds to one element in the set. Preferably, ^G { ^{e 4} ^ 2 ⁰ , ¹ , ..., ³ ) , j is a pure imaginary number, such as j ^{= e 2} . In the implementation, the precoding matrix is: one of formula 3 to formula 6

Diag(U _v ) 0

(Wj (3⁄4W ₂ )-W ₃ ( (3⁄4diag(U _H )) XV ® HM

0 diag(U _v )

.....Formula three;

..... formula five;

Diag(U _v ) 0

W = (Wj (3⁄4W ₂ ) -w ₃ (3⁄4diag(AU _H )) " Xv ® HM

0 diag(BU _v )

Formula six;

Where W is a precoding matrix; is a first component precoding matrix; w ₂ is a second component precoding matrix;

W ₃ is a third component precoding matrix; ^U v is a beamforming vector whose dimension is °v ^xl ; B is a DvXDv diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U An element whose diagonal element is equal to the vector U; ^U H is a beamforming vector whose dimension is D _H xl; A is a D _H xD _H diagonal matrix; D _H is a positive integer; i is a modulus value of 1 The complex scalar; V is a beamforming vector whose dimension is D _v xl X _H is a beamforming vector whose dimension is D _H xl i=l"."r is a positive integer and M is a power normalization coefficient.

1

Preferably, M

In the implementation, Equation 3~Formula 6 can also be transformed. In the above formula, the third component precoding matrix is the product of the matrix and M; M can also be used as part of the first component precoding matrix, that is, the first component is pre- The coding matrix is a product of a matrix and M, and the second component precoding matrix and the third component precoding matrix are a matrix; M may also be used as a part of the second component precoding matrix, that is, the second component precoding matrix is a matrix and M The product of the first component precoding matrix and the third component precoding matrix as a matrix can also separate M, that is,

W = (W ₁ (8) W ₂ ) - W ₃ -M. The user equipment 10 combines the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix The product is used as a precoding matrix. That is, W = ( (8) W ₂ ) · W ₃ . For mode 1, if the user equipment 10 determines a precoding matrix in advance, and selects a plurality of first component precoding matrices from one of the component precoding matrix sets, one component is selected from each of the other two component precoding matrix sets. The precoding matrix may select one of the plurality of first component precoding matrices according to one of Equations 3 to 6.

Manner 2: The user equipment 10 determines at least one precoding matrix, and determines at least one precoding according to the correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix. First precoding indication information, second precoding indication information, and third precoding indication information corresponding to the matrix; one of the determined first precoding indication information, second precoding indication information, and third precoding indication information The first precoding indication information, the second precoding indication information, and the third precoding indication information are the first precoding indication information, the second precoding indication information, and the third precoding indication information that need to be notified to the network side.

The at least one precoding matrix determined by the user equipment 10 is a function of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix. Specifically, the at least one precoding matrix determined by the user equipment 10 is a product of a first component precoding matrix, a second component precoding matrix, and a third component precoding matrix.

The expression formulas of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix in the foregoing manner 1 are also applicable to the second method; the first component precoding matrix in the foregoing manner 1 is second. The correspondence between the component precoding matrix and the third component and the precoding matrix is also applicable to the second method.

After the network side device 20 receives the first precoding indication information, the second precoding indication information, and the third precoding indication information from the user equipment 10, there are multiple types according to the first precoding indication information, and the second The manner in which the precoding indication information and the third precoding indication information determine the precoding matrix are as follows:

In a first mode, the network side device 20 determines a first component precoding matrix corresponding to the first precoding indication information, and determines a second component precoding matrix corresponding to the second precoding indication information, and determines a third precoding indication information corresponding to the third precoding matrix. a third component precoding matrix;

The network side device 20 determines the precoding matrix according to one of Equations 3 to 6.

Specifically, the network side device 20 determines a first component precoding matrix corresponding to the first precoding indication information, and determines a second component precoding matrix corresponding to the second precoding indication information, and determines a third precoding indication information corresponding to the third precoding matrix. The third component precoding matrix, and then the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix are brought into one of Equations 3 to 6, to determine the first precoding indication. The information, the second precoding indication information and the precoding matrix corresponding to the third precoding indication information.

The network side device 20 determines, according to the correspondence between the preset first component precoding matrix and the first precoding indication information, the first component precoding matrix corresponding to the received first precoding indication information; Determining a correspondence between the second component precoding matrix and the second precoding indication information, and determining the received second precoding indication information Corresponding second component precoding matrix; determining a third component precoding matrix corresponding to the received second precoding indication information according to a correspondence between the preset third component precoding matrix and the third precoding indication information.

In the second mode, the network side device 20 determines the received first precoding indication information according to the preset correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix. And a second precoding indication information and a precoding matrix corresponding to the third precoding indication information.

The correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix may be set as needed. In the implementation, the correspondence may be specified in the protocol; it may also be signaled by the upper layer.

After the network side device 20 determines the precoding matrix, the transmission data of the user equipment 10 is preprocessed with the determined precoding matrix.

The horizontal dimension and the vertical dimension of the embodiment of the present application can be exchanged.

The network side device 20 of the embodiment of the present application may be a base station (such as a macro base station, a home base station, etc.), or may be an RN (relay) device, or may be another network side device.

As shown in FIG. 5, the user equipment in the system for determining the precoding matrix in the embodiment of the present application includes: a first determining module 500 and a sending module 510.

The first determining module 500 is configured to determine first precoding indication information, second precoding indication information, and third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication The information corresponds to the precoding matrix, and the precoding matrix is equal to the function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, and the first component precoding matrix is a diagonal matrix; The coding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam rotation vector is equal to the Kronecker product of the two vectors; the sending module 510 is configured to send the first precoding indication information to the network side, the second pre- Encoding indication information and third precoding indication information.

Preferably, the first determining module 500 selects a first component precoding matrix from the first component precoding matrix set, and determines first precoding indication information corresponding to the selected first component precoding matrix, and the second component. Selecting a second component precoding matrix in the precoding matrix set, determining second precoding indication information corresponding to the selected second component precoding matrix, and selecting a third component precoding matrix from the third component precoding matrix set, And determining third precoding indication information corresponding to the selected third component precoding matrix.

Preferably, the first determining module 500 determines, according to a preset correspondence between the first component precoding matrix and the first precoding indication information, the first precoding indication information corresponding to the first component precoding matrix, and according to the foregoing Determining a correspondence between the second component precoding matrix and the third precoding indication information, determining second precoding indication information corresponding to the second component precoding matrix, and according to a preset third component precoding matrix and Three precoding indication information Corresponding relationship, determining third precoding indication information corresponding to the third component precoding matrix.

Preferably, the first determining module 500 determines at least one precoding matrix, and determines at least the correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix. First precoding indication information, second precoding indication information, and third precoding indication information corresponding to one precoding matrix; first determined precoding indication information, second precoding indication information, and third precoding indication information Selecting a first precoding indication information, a second precoding indication information, and a third precoding indication information.

Preferably, the first component precoding matrix is: or

D XDv diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Preferably, U _v is a set of beamforming matrices U _v is an element of a set {U _v , _q :q = 0,l,...,N _v — 1} formed by a beamforming vector, U _v =U _v , _n , 0≤n≤N _v — 1; N _v is a positive integer. Preferably, the second component precoding matrix is diag(U _H ) or diag( AU _H ); wherein, ^U H is a beamforming vector having a dimension of 1 1; A is a D _H xD _H diagonal matrix; _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Preferably, ^U H is an element of the set {U _H ,p: ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, U _H =U _{H k} , o≤k ≤ N _H -l, N _H is a positive integer. Preferably, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The three-component precoding matrix is:

its

Where W ₃ is a third component precoding matrix; ^ is a complex scalar with a modulus of 1; i , is a beamforming vector whose dimension is " ^{Η /}丄=― l"." r

Its dimensions are eight^..., ¹ , D and

^D v is a positive integer and M is a power normalization coefficient.

Preferably, the precoding matrix is:

As shown in FIG. 6, the network side device in the system for determining the precoding matrix in the embodiment of the present application includes: a receiving module 600 and a second determining module 610.

The receiving module 600 is configured to receive first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment, where

a second determining module 610, configured to determine a precoding matrix according to the first precoding indication information, the second precoding indication information, and the third precoding indication information;

The first precoding indication information, the second precoding indication information, and the third precoding indication information correspond to a precoding matrix, where the precoding matrix is equal to the first component precoding matrix, the second component precoding matrix, and the third component pre a function matrix of a coding matrix, wherein the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, and the beam rotation vector is equal to two vectors of Kronecker product.

Preferably, the second determining module 610 determines a first component precoding matrix corresponding to the first precoding indication information, and a second component precoding matrix corresponding to the second precoding indication information, and determining the third precoding indication information. Corresponding third component precoding matrix; the product of the first component precoding matrix, the second component precoding matrix and the third component precoding matrix is used as a precoding matrix.

Preferably, the second determining module 610 determines, according to a correspondence between the preset first component precoding matrix and the first precoding indication information, a first component precoding matrix corresponding to the received first precoding indication information; Determining, according to a preset correspondence between the second component precoding matrix and the second precoding indication information, a second component precoding matrix corresponding to the received second precoding indication information; according to a preset third component pre-predetermined Corresponding relationship between the coding matrix and the third precoding indication information, determining a third component precoding matrix corresponding to the received second precoding indication information.

Preferably, the first component precoding matrix is: or

D XDv diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U. Preferably, U _v is an element of the set {U _v , _q :q = 0,l,...,N _v -1} formed by the beamforming vector, ^U v ^=U v, _n , 0≤ n ≤ N _v — 1; N _v is a positive integer. Preferably, the second component precoding matrix is diag (U _H ) or diag (AU _H );

Preferably, ^U H is an element of the set {U _H , _p : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, U _H =U _{H k} , o≤k ≤ N _H -l, N _H is a positive integer. Preferably, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

Where W ₃ is a third component precoding matrix; ^ is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D V ^Xl , ^X H is a beamforming vector whose dimension is ^D H ^Xl , 1 =1"··, ϊ, D _H and

^D v is a positive integer and M is a power normalization coefficient.

Preferably, the second determining module 610 determines the received first precoding according to the correspondence between the preset first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix. a precoding matrix corresponding to the indication information, the second precoding indication information, and the third precoding indication information.

Based on the same inventive concept, a method for transmitting precoding indication information is also provided in the embodiment of the present application. The user equipment in the system for determining the precoding matrix is a device corresponding to the method, and the method solves the problem and determines the pre The user equipment in the system of the coding matrix is similar, so the implementation of the method can be referred to the implementation of the device, and the repeated description is not repeated.

As shown in FIG. 7, the method for transmitting precoding indication information in the embodiment of the present application includes the following steps:

Step 701: The user equipment determines first precoding indication information, second precoding indication information, and third precoding indication information, where the first precoding indication information, the second precoding indication information, and the third precoding indication information and the pre Coding Corresponding to the matrix, the precoding matrix is equal to the function matrix of the first component precoding matrix, the second component precoding matrix and the third component precoding matrix, the first component precoding matrix is a diagonal matrix; the second component precoding matrix is a pair The third component precoding matrix is composed of a beam rotation vector, and the beam rotation vector is equal to the Kronecker product of the two vectors. Step 702: The user equipment sends the first precoding indication information, the second precoding indication information, and the Three precoding indication information.

In an implementation, there are many ways for the user equipment to determine the first precoding indication information and the second precoding indication information, and the following are listed:

Manner 1: The user equipment selects a first component precoding matrix from the first component precoding matrix set, and determines first precoding indication information corresponding to the selected first component precoding matrix, and the second component precoding matrix set from the second component precoding matrix Selecting a second component precoding matrix, determining a second precoding indication information corresponding to the selected second component precoding matrix, and selecting a third component precoding matrix from the third component precoding matrix set, and determining the selected The third precoding indication information corresponding to the third component precoding matrix.

Specifically, the user equipment estimates, according to the pilot signal sent by the network side device, a channel of each antenna port to the user equipment, where each antenna port corresponds to one or more physical antennas;

Then, the user equipment selects a first component precoding matrix from the first component precoding matrix set according to the estimated channel, and selects a second component precoding matrix from the second component precoding matrix set, and the third component. A third component precoding matrix is selected in the precoding matrix set.

For the first mode, when the user equipment transmits the first precoding indication information, the second precoding indication information, and the third precoding indication information to the network side device, the first precoding indication information and the second precoding indication information And the third pre-coding indication information may be reported at different times, reported in different time granularity and frequency domain granularity; or may be simultaneously applied.

In an implementation, the first component precoding matrix of the embodiment of the present application is a block diagonal matrix, and the first component precoding matrix is one of Equation 1 and Formula 2.

In an implementation, the second component precoding matrix of the embodiment of the present application is &8(1 ₁₁ ) or (^&8(8 1; ₁₁ ); Where ^U H is a beamforming vector with a dimension of 1 1; A is a D _H xD _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U, diagonally The element above is equal to the element of vector U. Preferably, ^D H is half the number of horizontal antennas. Preferably, ^U H is an element of the set {U _H , _p : ρ = 0,1,...,Ν _Η -1} formed by the beamforming vector, U _H =U _{H k} , o≤k ≤ N _H -l, N _H is a positive integer. Preferably, ^U H is part of a DFT matrix or a DFT matrix. In implementation, the third component precoding matrix is a product of a (2M _H M _v )xr dimensional matrix and a power normalization coefficient, and r is a number of columns of the precoding matrix;

The third component precoding matrix is:

its

In the middle, W ₃ is a third component precoding matrix; is a complex scalar with a modulus value of 1; its dimension is ^D V ^Xl , and ^X H is a beamforming vector whose dimension is ^D H ^Xl , 1 =1"··, ϊ , D _H and

^D v is a positive integer and M is a power normalization coefficient.

For mode 1, if the user equipment predetermines the precoding matrix and selects a plurality of first component precoding matrices from one of the component precoding matrix sets, one component preselects each of the other two component precoding matrix sets. The coding matrix may select one of the plurality of first component precoding matrices according to one of Equations 3 to 6.

^ν = ( ί(8)ν ₂ )· ν ₃ ·Μ.

Manner 2: The user equipment determines at least one precoding matrix, and determines at least one precoding matrix according to the correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix. Corresponding first precoding indication information, second precoding indication information, and third precoding indication information; one of the determined first precoding indication information, second precoding indication information, and third precoding indication information Precoding indication letter And a second precoding indication information and a third precoding indication information as the first precoding indication information, the second precoding indication information, and the third precoding indication information that need to be notified to the network side.

The at least one precoding matrix determined by the user equipment is a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix. Specifically, the at least one precoding matrix determined by the user equipment is a product of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix.

Based on the same inventive concept, a method for determining a precoding matrix is also provided in the embodiment of the present application. The network side device in the system for determining the precoding matrix is a device corresponding to the method, and the method solves the problem and determines the pre The network side devices in the system of the coding matrix are similar. Therefore, the implementation of the method can be referred to the implementation of the device, and the repeated description is not repeated.

As shown in FIG. 8, the method for determining a precoding matrix in the embodiment of the present application includes the following steps:

Step 801: The network side device receives first precoding indication information, second precoding indication information, and third precoding indication information from the user equipment.

Step 802: The network side device determines the precoding matrix according to the first precoding indication information, the second precoding indication information, and the third precoding indication information.

After the network side device receives the first precoding indication information, the second precoding indication information, and the third precoding indication information from the user equipment, there are multiple types of data according to the first precoding indication information and the second precoding. The manner in which the indication information and the third precoding indication information determine the precoding matrix are as follows:

In a first mode, the network side device determines a first component precoding matrix corresponding to the first precoding indication information, and determines a second component precoding matrix corresponding to the second precoding indication information, and determines a third corresponding to the third precoding indication information. Three component precoding matrix;

The network side device determines the precoding matrix according to one of Equations 3 to 6.

Specifically, the network side device determines a first component precoding matrix corresponding to the first precoding indication information, and determines a second component precoding matrix corresponding to the second precoding indication information, and determines a third corresponding to the third precoding indication information. The three-component precoding matrix, and then the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix are brought into one of Equations 1 to 4 to determine the first precoding indication information. Corresponding first component precoding matrix. The network side device determines, according to the correspondence between the preset first component precoding matrix and the first precoding indication information, the first component precoding matrix corresponding to the received first precoding indication information; Determining a correspondence between the second component precoding matrix and the second precoding indication information, determining a second component precoding matrix corresponding to the received second precoding indication information; according to a preset third component precoding matrix and And determining, by the third precoding indication information, a third component precoding matrix corresponding to the received second precoding indication information.

Manner 2: The network side device determines, according to a preset correspondence between the first precoding indication information, the second precoding indication information, the third precoding indication information, and the precoding matrix, the received first precoding indication information and The second precoding indicates a precoding matrix corresponding to the information.

After the network side device determines the precoding matrix, the transmission data of the user equipment is preprocessed by using the determined precoding matrix.

The radio unit is configured to send first precoding indication information, second precoding indication information, and third precoding indication information to the network side.

The first precoding indication information, the second precoding indication information, and the third precoding indication information and the precoding moment Corresponding to, the precoding matrix is equal to a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, wherein the first component precoding matrix is a diagonal matrix; The two-component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, which is equal to the Kronecker product of the two vectors.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the application can be in the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can be embodied in the form of a computer program product embodied on one or more computer-usable storage media, including but not limited to disk storage, CD-ROM, optical storage, and the like.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the present application has been described, those skilled in the art can make additional changes and modifications to the embodiments once they are aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

Rights request

A method for transmitting precoding indication information, the method comprising:

The method according to claim 1, wherein the determining, by the user equipment, the first precoding indication information, the second precoding indication information, and the third precoding indication information,

The method according to claim 2, wherein the determining, by the user equipment, the first precoding indication information, the second precoding indication information, and the third precoding indication information,

Determining, by the user equipment, the first precoding indication information corresponding to the first component precoding matrix according to the correspondence between the preset first component precoding matrix and the first precoding indication information, and according to the preset second Corresponding relationship between the component precoding matrix and the third precoding indication information, determining second precoding indication information corresponding to the second component precoding matrix, and according to the preset third component precoding matrix and the third precoding indication information Corresponding relationship, determining third precoding indication information corresponding to the third component precoding matrix.

The user equipment selects a first precoding indication information, a second precoding indication information, and a third precoding from the determined first precoding indication information, the second precoding indication information, and the third precoding indication information. Instruction letter

The method according to any one of claims 1 to 4, wherein the first component precoding matrix is:

; or

6. The method of claim 5, wherein U _v is a set of beamforming vectors

An element in {U _v , _q :q = 0,l,...,N _v — 1}, U _v =U _v , _n , 0≤n≤N _v — 1; N _v is a positive integer.

The method according to any one of claims 1 to 4, wherein the second component precoding matrix is diag(U _H ) or diag (AU _H );

8. The method of claim 7, wherein ^U H is a set of beamforming vectors

An element in {U _H , _p : _{P =} 0,l,...,N _H — 1}, U _H =U _H , _k , o≤k≤N _H -l, N _H is a positive integer.

The method according to any one of claims 1 to 4, wherein the third component precoding matrix is

(2M _H M _v ) the product of the xr dimensional matrix and the power normalization coefficient, and _r is the number of columns of the precoding matrix;

The three component precoding matrix is:

its

Where w ₃ is the third component precoding matrix; ^ is a complex scalar with a modulus of 1;

D' is a positive integer and M is a power normalization coefficient.

10. The method according to claim 1, wherein the precoding matrix is:

W = (W _X ®W ₂ ) - W ₃ - Where W is a precoding matrix; is a first component precoding matrix; w ₂ is a second component precoding matrix; w ₃ is a third component precoding matrix.

11. A method of determining a precoding matrix, the method comprising:

The method according to claim 11, wherein the determining, by the network side device, the precoding matrix comprises: determining, by the network side device, a first component precoding matrix corresponding to the first precoding indication information, and determining a second component precoding matrix corresponding to the second precoding indication information, and a third component precoding matrix corresponding to the third precoding indication information;

The method according to claim 12, wherein the determining, by the network side device, the first component precoding matrix corresponding to the first precoding indication information comprises:

Determining, by the network side device, the first component precoding matrix corresponding to the received first precoding indication information according to the correspondence between the preset first component precoding matrix and the first precoding indication information;

14. The method of claim 11, wherein the first component precoding matrix is:

; or

Diag(U _v ) Where ^w i is the first component precoding matrix; ^u v is a beamforming vector whose dimension is ^ ¹ ; B is

15. The method of claim 14, wherein U _v is a set of beamforming vectors

The method according to claim 11, wherein the second component precoding matrix is &8(1 ₁₁ ) or diag(AU _H );

17. The method of claim 16 wherein ^U H is a set of beamforming vectors

_{_{{U H, p: P =}} 0, l, ..., N H - 1} is an ^{^{_{element, U H = <k≤N H -l}}} , N H is a positive integer ^LJ H, k 0.

18. The method of claim 11, wherein the third component precoding matrix is

The third component precoding matrix is:

its

D _v xl X _H

Its dimension is a beamforming vector whose dimension is D _H xl i=l"."r D and D ''V are positive integers, and M is a power normalization coefficient.

The method according to claim 11, wherein the determining, by the network side device, the precoding matrix comprises: the network side device according to the preset first precoding indication information, the second precoding Determining, by the indication information, the correspondence between the third precoding indication information and the precoding matrix, determining a precoding matrix corresponding to the received first precoding indication information, the second precoding indication information, and the third precoding indication information.

A user equipment for transmitting precoding indication information, the user equipment comprising: a first determining module, configured to determine first precoding indication information, second precoding indication information, and third precoding indication information The first precoding indication information, the second precoding indication information, and the third precoding indication information and precoding Corresponding to the matrix, the precoding matrix is equal to a function matrix of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix, wherein the first component precoding matrix is a diagonal matrix; The component precoding matrix is a diagonal matrix; the third component precoding matrix is composed of a beam rotation vector, the beam rotation vector being equal to the Kronecker product of two vectors

And a sending module, configured to send first precoding indication information, second precoding indication information, and third precoding indication information to the network side.

The user equipment according to claim 20, wherein the first determining module is specifically configured to: select a first component precoding matrix from the first component precoding matrix set, and determine the selected first component a first precoding indication information corresponding to the precoding matrix, and selecting a second component precoding matrix from the second component precoding matrix set, and determining second precoding indication information corresponding to the selected second component precoding matrix, and And selecting a third component precoding matrix from the third component precoding matrix set, and determining third precoding indication information corresponding to the selected third component precoding matrix.

The user equipment according to claim 21, wherein the first determining module is specifically configured to: determine, according to a correspondence between a preset first component precoding matrix and first precoding indication information, a first precoding indication information corresponding to a component precoding matrix, and determining a second corresponding to the second component precoding matrix according to a correspondence between the preset second component precoding matrix and the third precoding indication information Precoding indication information, and determining third precoding indication information corresponding to the third component precoding matrix according to a correspondence between the preset third component precoding matrix and the third precoding indication information.

The user equipment according to claim 20, wherein the first determining module is specifically configured to: determine at least one precoding matrix, and compare the first precoding indication information and the second precoding indication information And determining, by the third precoding indication information and the precoding matrix, the first precoding indication information, the second precoding indication information, and the third precoding indication information corresponding to the at least one precoding matrix; A first precoding indication information, a second precoding indication information, and a third precoding indication information are selected from the coding indication information, the second precoding indication information, and the third precoding indication information.

The user equipment according to any one of claims 20 to 23, wherein the first component precoding matrix is: diag(U _v ) 0 Ί

w _{1 =}

- 0 diag(U _v )J ^; or diag(U _v ) 0 "

0 diag(BU _v )"; where ^w i is the first component precoding matrix; ^u v is the beamforming vector whose dimension is ^ ¹ ; B is

°v ^{x D} v diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U, the elements on the diagonal An element equal to the vector u.

The user equipment according to claim 24, wherein U _v is one of a set of beamforming vectors {U _v , _q : q = 0, l, ..., N _v — 1} Element, U _v =U _v , _n , 0≤n≤N _v — 1; N _v is a positive integer.

The user equipment according to any one of claims 20 to 23, wherein the second component precoding matrix is diag (U _H ) or diag (AU _H );

27. The user equipment of claim 26, wherein ^U H is a set of beamforming vectors

An element in {U _H , _p : _{P =} 0,l,...,N _H — 1}, U _H =U _H , _k , _0≤k≤NH — N _H is a positive integer.

The user equipment according to any one of claims 20 to 23, wherein the third component precoding matrix is

(2M _H M _v ) The product of the xr dimensional matrix and the power normalization coefficient, _r is the number of columns of the precoding matrix; the three component precoding matrix is:

Where W ₃ is a third component precoding matrix; ^ is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D v ^XL , ^X H is a beamforming vector whose dimension is ^D H ^Χ1 , 1 =1"··, ϊ, D _H and

^D v is a positive integer and M is a power normalization coefficient.

The user equipment according to claim 20, wherein the precoding matrix is:

30. A network side device that determines a precoding matrix, where the network side device includes: a receiving module, configured to receive first precoding indication information, second precoding indication information, and a third pre Code indication information;

a second determining module, configured to: according to the first precoding indication information, the second precoding indication information, and the third pre-editing Code indication information, determining a precoding matrix;

The network side device according to claim 30, wherein the second determining module is specifically configured to: determine a first component precoding matrix corresponding to the first precoding indication information, and determine a second precoding indication a second component precoding matrix corresponding to the information, and a third component precoding matrix corresponding to the third precoding indication information; a product of the first component precoding matrix, the second component precoding matrix, and the third component precoding matrix As a precoding matrix.

The network side device according to claim 31, wherein the second determining module is specifically configured to: determine, according to a correspondence between a preset first component precoding matrix and a first precoding indication information, a first component precoding matrix corresponding to the received first precoding indication information; determining, according to a preset correspondence between the second component precoding matrix and the second precoding indication information, the received second precoding indication information Corresponding second component precoding matrix; determining a third component precoding matrix corresponding to the received second precoding indication information according to a correspondence between the preset third component precoding matrix and the third precoding indication information.

33. The network side device according to claim 30, wherein the first component precoding matrix is: or

°v ^{x D} v diagonal matrix; 1 is a positive integer; diag(U) is a diagonal matrix composed of vectors U whose elements on the diagonal are equal to the elements of vector U.

34. The network side device according to claim 33, wherein U _v is a set of beamforming vectors {U _v , _q : q = 0, l, ..., N _v — 1} an _{_{_{element, U v = U v, n}}} , 0≤n≤N v - 1; N v is a positive integer.

The network side device according to claim 30, wherein the second component precoding matrix is diag (U _H ) or diag (AU _H ); Where ^U H is a beamforming vector with a dimension of 1 1; A is a D _H x D _H diagonal matrix; D _H is a positive integer; diag(U) is a diagonal matrix composed of vectors U, diagonally The line element is equal to the element of the vector U.

36. The network side device according to claim 35, wherein ^U H is a set of beamforming vectors {U _H , _p : _{P =} 0, l, ..., N _H — 1} An element, U _H =U _H , _k , o≤k≤N _H -l , N _H is a positive integer.

37. The network side device according to claim 30, wherein the third component precoding matrix is

The third component precoding matrix is:

Wherein W ₃ is a third component precoding matrix; is a complex scalar with a modulus of 1; V is a beamforming vector whose dimension is ^D v ^xl , ^X H is a beamforming vector whose dimension is ^d H ^XL , i = l-, , D _H and

^D v is a positive integer and M is a power normalization coefficient.

The network side device according to claim 30, wherein the second determining module is specifically configured to:: according to preset first precoding indication information, second precoding indication information, third precoding Determining a correspondence between the information and the precoding matrix, and determining a precoding matrix corresponding to the received first precoding indication information, the second precoding indication information, and the third precoding indication information.

39. A system for determining a precoding matrix, the system comprising: