WO2018129733A1 - Method for determining channel state information, access network device, and terminal device - Google Patents

Abstract

Embodiments of the present application provide a method for determining channel state information, an access network device, and a terminal device. The method comprises: a terminal device receives precoding matrix indication information from an access network device; the terminal unit determines M first matrices from N first matrices according to a first indication field; the terminal device determines K second matrices according to a second indication field; the terminal device determines MxK first coding matrices; the terminal device determines a set of precoding matrices according to the MxK first precoding matrices; the terminal device receives a channel state information reference signal from the access network device; the terminal device determines channel state information according to the channel state information reference signal and the set of precoding matrices; and the terminal device sends the channel state information to the access network device. By means of the technical solution, wireless resources occupied in a process of determining channel state information can be reduced.

Description

Method for determining channel state information, access network device and terminal device Technical field

The embodiments of the present application relate to the field of communications technologies, and more specifically, to a method for determining channel state information, an access network device, and a terminal device.

Background technique

When the access network device communicates with the terminal device, the access network device needs to obtain the channel state information estimated by the terminal device (English: Channel Status Information, referred to as CSI). The CSI can adapt the communication system to the current channel conditions. In particular, high reliability and high rate communication can be guaranteed in a multi-antenna system.

Specifically, the access network device first sends precoding matrix indication information to the terminal device, where the precoding matrix indication information is used to indicate a precoding matrix that is allowed to be used by the terminal and a precoding matrix that is prohibited from being used by the terminal. After that, the access network device sends a channel status information reference signal (English: Channel Status Information-Reference Signal, CSI-RS for short). The terminal device may determine the CSI according to the precoding matrix indication information and the CSI-RS, and feed back the determined CSI to the access network device.

In the tenth version of the LTE standard (English: LTE Release 10, LTE Rel-10 for short), a bipolar precoding matrix structure is defined, that is, a precoding matrix is multiplied by a first precoding matrix and a second precoding matrix. . Correspondingly, the precoding matrix indication information sent by the access network device is a bit sequence. Each bit in the bit sequence corresponds to each of the first precoding matrix and the second precoding matrix below each rank. The access network device indicates whether the first precoding matrix and the second precoding matrix corresponding to the bit are restricted in use by controlling the value of each bit in the bit sequence to be 0 or 1. After receiving the bit sequence, the terminal device may determine, according to the value of each bit in the bit sequence, whether a precoding matrix corresponding to each bit is usable.

However, as the number of antennas increases, the number of precoding matrices increases accordingly. In particular, another form of precoding matrix is defined in the fourteenth version of the LTE standard (English: LTE Release 14, LTE Rel-14 for short), wherein the first precoding matrix is composed of mutually orthogonal vector pairs And amplitude or energy information is introduced in the first precoding matrix. At this time, the number of precoding matrices is significantly increased. At this time, the length of the bit sequence for indicating whether the precoding matrix is available is also increased accordingly. Therefore, if a long bit sequence is transmitted, the occupation of radio resources is increased.

Summary of the invention

The method for determining channel state information, the access network device, and the terminal device provided by the embodiments of the present application can reduce the occupied radio resources in the process of determining channel state information.

为该M×K 个第一预编码矩阵中的第m×k个第一预编码矩阵，

为该M个第一矩阵中的第m个第一矩阵，P^k为该K个第二矩阵中的第k个第二矩阵，

m＝1,…,M，k＝1,…,K；该终端设备根据该M×K个第一预编码矩阵，确定预编码矩阵集合；该终端设备从该接入网设备接收信道状态信息参考信号；该终端设备根据该信道状态信息参考信号和该预编码矩阵集合，确定信道状态信息；该终端设备向该接入网设备发送该信道状态信息。根据上述技术方案，该接入网设备在指示预编码矩阵集合时可以指示用于组成第一预编码矩阵的第一矩阵和第二矩阵，从而无需指示每个预编码矩阵是否属于该预编码矩阵集合。这样可以减少用于指示预编码矩阵集合的指示信息的长度，从而能够减少在确定CSI的过程中对于无线资源的占用。In a first aspect, the embodiment of the present application provides a method for determining channel state information, where the method includes: a terminal device receiving precoding matrix indication information from an access network device, where the precoding matrix indication information includes a first indication field and a second indication field; the terminal device determines M first matrices from the N first matrices according to the first indication field, where each first matrix in the first matrix comprises a vector consisting of at least two vectors a group, where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N; the terminal device determines K second matrices according to the second indication field, where the K The second matrix is a diagonal matrix, and K is a positive integer greater than or equal to 1; the terminal device determines M×K first precoding matrices, where

Is the m×k first precoding matrices in the M×K first precoding matrices,

For the mth first matrix of the M first matrices, P ^{k is the kth} second matrix of the K second matrices,

m=1, . . . , M, k=1, . . . , K; the terminal device determines a precoding matrix set according to the M×K first precoding matrices; the terminal device receives channel state information from the access network device a reference signal; the terminal device determines channel state information according to the channel state information reference signal and the precoding matrix set; the terminal device sends the channel state information to the access network device. According to the above technical solution, the access network device may indicate the first matrix and the second matrix used to form the first precoding matrix when indicating the precoding matrix set, so that it is not necessary to indicate whether each precoding matrix belongs to the precoding matrix. set. This can reduce the length of the indication information for indicating the set of precoding matrices, thereby being able to reduce the occupation of radio resources in the process of determining CSI.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first indication field includes N bits, and the terminal device determines, according to the first indication field, M pieces from the N first matrices. a matrix, comprising: the terminal device determining, according to the nth bit of the N bits, whether the nth first matrix in the N first matrices belongs to the M first matrices, where n=1, ..., N. The relationship between the first matrix and the bit value of the foregoing technical solution is simple, and the terminal device and the access network device do not need to save or preset complex mapping relationships.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the first indication field includes S bits, and the terminal device determines, according to the first indication field, M pieces from the N first matrices. a matrix, comprising: the terminal device determining, according to the sth bit of the S bits, whether the first matrix corresponding to the sth bit in the N first matrices belongs to the M first matrices, where s=1, . . . , S, S is a positive integer less than N and greater than or equal to 1, and the number of first matrices corresponding to at least one of the S bits is a positive integer greater than or equal to 2. According to the above technical solution, the number of bits used to indicate the attributes of the first matrix can be reduced, so that the purpose of saving resources can be achieved.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, any two vectors in the vector group are orthogonal. In this way, when the access network device limits the vector in one direction, the set of vectors that can be combined into the vector of the direction can be simultaneously limited, so that multiple vectors can be prevented from being combined in the restricted direction by the stronger energy. Causes the vector limit to fail.

为该L个第二预编码矩阵中的第l个第二预编码矩阵，W^mkl为根据该第m×k个第一预编码矩阵和该第l个第二预编码矩阵确定的预编码矩阵。上述技术方案中，接入网设备可以通过限制第二预编码矩阵的方式，限制预编码矩阵。With reference to the first aspect, or any one of the foregoing possible implementation manners of the first aspect, in the fourth possible implementation manner of the first aspect, the precoding matrix indication information further includes a third indication field, the method further includes: The terminal device determines, according to the third indication field, L second precoding matrices, where L is a positive integer greater than or equal to 1; the terminal device determines the precoding matrix according to the M×K first precoding matrices. And determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is a precoding matrix determined according to the m×k first precoding matrices and the first second precoding matrix. . In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the second precoding matrix.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the at least one element of each of the L second precoding matrices The value is indicated by the third indication field. In the above technical solution, the access network device may limit the precoding matrix by limiting the candidate values of the elements of the second precoding matrix.

In conjunction with the fourth possible implementation of the first aspect, in a sixth possible implementation of the first aspect, The number of columns of elements of each of the L second precoding matrices is indicated by the third indication field. In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the number of columns of the second precoding matrix.

为该L个第二预编码矩阵中的第l个第二预编码矩阵，W^mkl为根据该第m×k个第一预编码矩阵和该第l个第二预编码矩阵确定的预编码矩阵。上述技术方案中，接入网设备可以通过限制第二预编码矩阵的列数的方式和元素的候选值的方式，限制预编码矩阵。In conjunction with the first aspect or the first possible implementation of the first aspect to any one of the possible implementations of the third possible implementation of the first aspect, the seventh possible implementation of the first aspect The precoding matrix indication information further includes a third indication field and a fourth indication field, the method further comprising: determining, by the terminal device, L second precoding matrices according to the third indication field and the fourth indication field, The value of at least one element in each of the L second precoding matrices is indicated by the third indication field, and each of the L second precoding matrices is second The number of columns of the elements of the precoding matrix is indicated by the fourth indication field, and L is a positive integer greater than or equal to 1; the terminal device determines the precoding matrix set according to the M×K first precoding matrices, The method includes: determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is a precoding matrix determined according to the m×k first precoding matrices and the first second precoding matrix. . In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the manner of the number of columns of the second precoding matrix and the candidate values of the elements.

In a second aspect, the embodiment of the present application provides a method for determining channel state information, where the method includes: the access network device sends precoding matrix indication information to the terminal device, where the precoding matrix indication information includes a first indication field and a second indication field, where the first indication field is used to indicate M first matrices in the N first matrices, and the second indication field is used to indicate K second matrices, each of the first matrices The matrix includes a vector group consisting of at least two vectors, each of which is a diagonal matrix, N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N, K A positive integer greater than or equal to 1; the access network device transmits a channel state information reference signal to the terminal device; the access network device receives channel state information from the terminal device. According to the above technical solution, the access network device may indicate the first matrix and the second matrix used to form the first precoding matrix when indicating the precoding matrix set, so that it is not necessary to indicate whether each precoding matrix belongs to the precoding matrix. set. This can reduce the length of the indication information for indicating the set of precoding matrices, thereby being able to reduce the occupation of radio resources in the process of determining CSI.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the first indication field includes N bits, and an nth bit of the N bits is used to indicate the N first matrices Whether the nth first matrix belongs to the M first matrices, where n=1, . . . , N. The relationship between the first matrix and the bit value of the foregoing technical solution is simple, and the terminal device and the access network device do not need to save or preset complex mapping relationships.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the first indicator field includes S bits, and the sth bit of the S bits is used to indicate the N first matrix Whether the first matrix corresponding to the sth bit belongs to the M first matrices, where s=1, . . . , S, S is a positive integer less than N and greater than or equal to 1, at least one of the S bits The number of first matrices corresponding to the bits is a positive integer greater than or equal to two. According to the above technical solution, the number of bits used to indicate the attributes of the first matrix can be reduced, so that the purpose of saving resources can be achieved.

With reference to the second aspect or any one of the foregoing possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, any two vectors in the vector group are orthogonal. In this way, the access network device can limit the set of vectors that can be merged into the vector in the direction while limiting the vector in one direction, thereby avoiding multiple vectors. By combining the strong energy in the restricted direction, the vector limit fails.

With reference to the second aspect or any one of the foregoing possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the precoding matrix indication information further includes a third indication field, the third indication field For indicating L second precoding matrices, where L is a positive integer greater than or equal to 1. In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the second precoding matrix.

In conjunction with the fourth possible implementation of the second aspect, in a fifth possible implementation of the second aspect, the at least one element of each of the second precoding matrices The value is indicated by the third indication field. In the above technical solution, the access network device may limit the precoding matrix by limiting the candidate values of the elements of the second precoding matrix.

With reference to the fourth possible implementation of the second aspect, in a sixth possible implementation manner of the second aspect, the number of the elements of each second precoding matrix in the L second precoding matrices is Indicated by the third indication field. In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the number of columns of the second precoding matrix.

With reference to the second aspect or the first possible implementation of the second aspect to any one of the possible implementations of the third possible implementation of the second aspect, the seventh possible implementation of the second aspect The precoding indicates that the information further includes a third indication field and a fourth indication field, where the third indication field and the fourth indication field are used to indicate L second precoding matrices, where the L second The value of at least one element in each second precoding matrix in the precoding matrix is indicated by the third indication field, the elements of each of the second precoding matrices of the L second precoding matrices The number of columns is indicated by the fourth indication field, and L is a positive integer greater than or equal to one. In the foregoing technical solution, the access network device may limit the precoding matrix by limiting the manner of the number of columns of the second precoding matrix and the candidate values of the elements.

In a third aspect, an embodiment of the present application provides a terminal device, where the access network device includes a unit for performing the first aspect or various possible implementation manners of the first aspect.

In a fourth aspect, an embodiment of the present application provides an access network device, where the terminal device includes a unit for performing various possible implementations of the second aspect or the second aspect.

In a fifth aspect, the embodiment of the present application provides a terminal device. The terminal device includes a processor, a memory, and a transceiver. The memory is for storing instructions to implement the method of the first aspect and any of the possible implementations of the first aspect. The processor executes the instructions stored in the memory, in conjunction with the communication interface, to implement the method of the first aspect or any of the possible implementations of the first aspect.

In a sixth aspect, an embodiment of the present application provides an access network device. The access network device includes a processor, a memory, and a transceiver. The memory is for storing instructions to implement the method of the second aspect and any of the possible implementations of the second aspect. The processor executes the instructions stored in the memory, in conjunction with the communication interface, to implement the method of any of the possible implementations of the second aspect or the second aspect.

DRAWINGS

Figure 1 shows a possible system network diagram of the present application;

2 is a schematic flowchart of a method for determining channel state information according to an embodiment of the present application;

FIG. 3 is a structural block diagram of a terminal device according to an embodiment of the present application;

4 is a structural block diagram of a network side device according to an embodiment of the present application;

FIG. 5 is a structural block diagram of a terminal device according to an embodiment of the present invention;

FIG. 6 is a structural block diagram of a network side device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, Long Term Evolution (LTE) system, LTE frequency division duplex (English: Frequency Division Duplex, FDD for short). ) system, LTE time division duplex (English: Time division duplex, abbreviation: TDD), the fifth generation (English: 5 ^th Generation, abbreviated: 5G) networks.

Figure 1 shows a possible system network diagram of the present application. At least one terminal device can be included in the system 100 shown in FIG. The at least one terminal device communicates with a radio access network (English: Radio Access Network, RAN for short). The RAN includes at least one access network device, and for the sake of clarity, only one access network device 101 and one terminal device 102 are shown. The RAN is connected to a core network (English: core network, referred to as CN). Optionally, the CN may be coupled to one or more external networks (English: External Network), such as the Internet, public switched telephone network (PSTN). The method for determining channel state information, the terminal device, and the access network device provided by the embodiments of the present application may be applied to the system shown in FIG. 1.

To facilitate understanding, some of the terms related to this application are described below.

The terminal device in the technical solution of the embodiment of the present application may also be referred to as an access terminal, a user equipment (English: User Equipment, UE for short), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, and a remote station. Terminals, mobile devices, user terminals, terminals, wireless communication devices, user agents or user devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and future 5G networks Terminal equipment.

The access network device in the technical solution of the present application may be an evolved base station (English: Evolutional Node B, eNB for short) in the LTE system, and a base station device in a future 5G network.

FIG. 2 is a schematic flowchart of a method for determining channel state information (CSI) according to an embodiment of the present application.

The access network device sends the precoding matrix indication information to the terminal device, where the precoding matrix indication information includes a first indication field and a second indication field.

202. The terminal device determines M first matrices from the N first matrices according to the first indication field, where each first matrix in the first matrix includes a vector group consisting of at least two vectors, where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N.

Optionally, in some embodiments, the first indication field includes N bits. In this case, the terminal device determines, according to the first indication field, the M first matrices from the N first matrices, including: the terminal device determines the N according to the nth bit of the N bits. Whether the nth first matrix in the first matrix belongs to the M first matrices, where n=1, . . . , N.

Specifically, the N first matrices are known to the terminal device and the access network device. The terminal device and the access network device can obtain the N first matrices in a plurality of manners, which is not limited by the embodiment of the present application. The N bits in the first indication field are in one-to-one correspondence with the N first matrices. Specifically, the first bit of the N bits corresponds to the first first matrix in the N first matrices, to indicate whether the first first matrix belongs to the M first matrices, and the N The second bit of the bits corresponds to the second first matrix of the N first matrices, Used to indicate whether the second first matrix belongs to the M first matrices, and so on. Each of the N bits may indicate whether the corresponding first matrix belongs to the M first matrices by using different bit values. For example, when the bit value is 1, the first matrix corresponding to the bit belongs to the M first A matrix having a bit value of 0 indicates that the first matrix corresponding to the bit does not belong to the M first matrices. The relationship between the first matrix and the bit value of the foregoing technical solution is simple, and the terminal device and the access network device do not need to save or preset complex mapping relationships.

For example, assume N=8 and M=3. Assuming that the access network device determines three first matrices, the three first matrices are respectively a first first matrix, a third first matrix, and a fifth first matrix in the eight first matrices. The first indication field that the access network device can send to the terminal device may be 10101000. After receiving the first indication field, the terminal device may determine, according to the first indication field, a first first matrix, a third first matrix, and a fifth first matrix in the eight first matrices. The three first matrices determined by the access network device.

Optionally, in other embodiments, the first indication field may include S bits, and S is a positive integer less than N and greater than or equal to 1. The terminal device determines, according to the sth bit of the S bits, whether the first matrix corresponding to the sth bit in the N first matrices belongs to the M first matrices, where s=1,... , S, the number of the first matrix corresponding to at least one of the S bits is a positive integer greater than or equal to 2. Understandably,

Specifically, each of the S bits corresponds to at least one of the N first matrices. Each of the first matrices of the N first matrices has at least one of the S bits. The correspondence between each of the S bits and the first matrix may be pre-stored or preset on the access network device and the terminal device. The correspondence between each of the S bits and the first matrix of the N first matrices may be represented by a function, or may be represented by a mapping relationship table, which is not limited. After determining the M first matrices in the N first matrices, the network device may determine values of bits corresponding to the M first matrices. For example, a bit value of 1 indicates that the first matrix corresponding to the bit belongs to the M first matrices, and a bit value of 0 indicates that the first matrices corresponding to the bits do not belong to the M first matrices. According to the above technical solution, the number of bits used to indicate the attributes of the first matrix can be reduced, so that the purpose of saving resources can be achieved.

For example, assume N=8, S=4, and M=4. The first bit of the S bits corresponds to the first first matrix and the second first matrix of the eight first matrices, and the second bit of the S bits corresponds to the eight first matrices The third first matrix and the fourth first matrix, the third bit of the S bits corresponds to the fifth first matrix and the sixth first matrix of the eight first matrices, in S bits The fourth bit corresponds to the seventh first matrix and the eighth first matrix of the eight first matrices. Assume that the four first matrices determined by the access network device are respectively the first first matrix, the second first matrix, the fifth first matrix, and the sixth first matrix in the eight first matrices The first indication field that the access network device can send to the terminal device may be 1010. After receiving the first indication field, the terminal device may determine, according to the first indication field, a first first matrix, a second first matrix, and a fifth first matrix in the eight first matrices. And the sixth first matrix belongs to the four first matrices determined by the access network device.

Optionally, in some embodiments, any two vectors in the set of vectors are orthogonal. In this way, when the access network device limits the vector in one direction, the set of vectors that can be combined into the vector of the direction can be simultaneously limited, so that multiple vectors can be prevented from being combined in the restricted direction by the stronger energy. Causes the vector limit to fail.

203. The terminal device determines, according to the second indication field, K second matrices, where the K second matrices are diagonal matrices, and K is a positive integer greater than or equal to 1.

Optionally, in some embodiments, the terminal device determines, according to the second indication field, K second matrices, The method includes: the terminal device determines K second matrices according to the second matrix template and the second indication field. The second matrix template includes at least one first non-fixed element. The second indication field is used to indicate a candidate value of each non-fixed element of the at least one first non-fixed element

In particular, the template for a second matrix diagonal matrix comprising diagonal elements P, P P elements of _a first element is the non-fixed element, wherein P ₁ is greater than or equal to 1 and less than or A positive integer equal to P. If P _{1 is} not equal to P, then P ₂ first fixed elements are further included in the P elements, P=P ₁ +P ₂ . The value of each of the P ₂ first fixed elements is determined. Each of the P ₁ first non-fixed elements may include X selectable values, and X is a positive integer greater than one. This may include a second indication field indicates P ₁ second subfield, the P ₁ second subfield correspond to the indication P ₁ of first non-fixing element. Each of the second subfield indicates that the second P ₁ indicates subfield comprises X bits, the bits X and X optional value correspondence, the bits of the X bit values of x Indicates whether the xth selectable value of the X selectable values is a candidate value.

0。假设，该接入网设备确定1和

为该第一非固定元素的候选值，则该接入网设备可以向该终端设备发送一个由4比特组成的第二指示字段。这四个比特的值分别为1010。该终端设备在接收到该第二指示字段后，可以确定出B1所在位置上的元素可以有两个值。因此，该终端设备可以确定出两个第二矩阵，其中该两个第二矩阵均为对角矩阵，且该两个第二矩阵中的一个第二矩阵对角线上的四个元素分别为A1、A2、A3、1，该两个第二矩阵中的另一个第二矩阵对角线上的四个元素分别为A1、A2、A3和

For example, suppose the diagonal of the second matrix template includes four elements, which are A1, A2, A3, and B1, respectively, where A1 to A3 indicate that the element at the position is the first fixed element, B1 Indicates that the element at this position is the first non-fixed element. Assume that each first non-fixed element can have four optional values, respectively 1,

0. Assume that the access network device determines 1 and

For the candidate value of the first non-fixed element, the access network device may send a second indication field consisting of 4 bits to the terminal device. The values of these four bits are 1010 respectively. After receiving the second indication field, the terminal device may determine that the element at the location of B1 may have two values. Therefore, the terminal device can determine two second matrices, wherein the two second matrices are diagonal matrices, and four elements on a diagonal of one of the two second matrices are respectively A1, A2, A3, 1, the four elements on the diagonal of the other second matrix of the two second matrices are A1, A2, A3, and

Optionally, in other embodiments, the terminal device may determine K second matrices from the K' second matrices according to the second indication field, where K' is a positive integer greater than or equal to K. Determining, by the terminal device, the implementation manners of the K second matrices from the K' second matrices according to the second indication field, and determining, by the terminal device, the M first matrices from the N first matrices according to the first indication field The implementation is the same, so I won't go into details here.

为该M×K个第一预编码矩阵中的第m×k个第一预编码矩阵，

为该M个第一矩阵中的第m个第一矩阵，P^k为该K个第二矩阵中的第k个第二矩阵，

m＝1,…,M，k＝1,…,K。204. The terminal device determines M×K first precoding matrices, where

For the m×k first precoding matrices in the M×K first precoding matrices,

For the mth first matrix of the M first matrices, P ^{k is the kth} second matrix of the K second matrices,

m=1,...,M,k=1,...,K.

205. The terminal device determines a precoding matrix set according to the M×K first precoding matrices.

Specifically, W = W ₁ × W ₂ , where W represents a precoding matrix, W ₁ represents a first precoding matrix, and W ₂ represents a second precoding matrix. W ₁ can be expressed by the following formula W ₁ = W _v × P, where W _v represents the first matrix and P represents the second matrix. According to step 202, the terminal device may determine M first matrices according to the first indication field sent by the access network device. According to step 203, the terminal device may determine the K second matrix according to the second indication field sent by the access network device. Thus, according to step 204, the terminal device can determine M×K first precoding matrices using the formula W ₁ =W _v ×P.

Optionally, in some embodiments, the at least one second precoding matrix that is saved or determined or preset by the terminal device is a second precoding matrix that can be used to determine a precoding matrix in the precoding matrix set. In this case, the terminal device may determine, according to the at least one second precoding matrix and the M×K first precoding matrices, in conjunction with the formula W=W ₁ ×W ₂ , each of the precoding matrix sets. Precoding matrices. According to the above technical solution, the access network device may indicate the first matrix and the second matrix used to form the first precoding matrix of the precoding matrix set when indicating the precoding matrix set, so that it is not necessary to indicate whether each precoding matrix is Belongs to the set of precoding matrices. This can reduce the length of the indication information used to indicate the set of precoding matrices. In addition, the manner in which the access network device indicates the first precoding matrix is to respectively indicate a first matrix and a second matrix that constitute the first precoding matrix. The first matrix is a set of vectors, the different values of the elements of the second matrix corresponding to different powers. That is to say, in the above technical solution, since the first matrix and the second matrix can be respectively indicated, the vector group and the power can be respectively limited.

Optionally, in other embodiments, the L second precoding matrices in the at least one second precoding matrix that are saved or determined or preset by the terminal device are used to determine a preamble in the precoding matrix set. A second precoding matrix of the coding matrix. In this case, the terminal device may determine each of the precoding matrix sets according to the M×K first precoding matrices and the L second precoding matrices in combination with the formula W=W ₁ ×W ₂ . A precoding matrix, where L is a positive integer greater than or equal to one.

为该L个第二预编码矩阵中的第l个第二预编码矩阵，W^mkl为根据该第m×k个第一预编码矩阵和该第l个第二预编码矩阵确定的预编码矩阵。上述实施例中，接入网设备可以通过限制第二预编码矩阵的方式，限制该预编码矩阵集合包括的预编码矩阵。Optionally, in some embodiments, the precoding matrix indication information sent by the access network device to the terminal device may further include a third indication field. The third indication field is used to indicate the L the second precoding matrix. The terminal device may determine, according to the third indication field, L second precoding matrices, where L is a positive integer greater than or equal to 1. In this case, the terminal device may determine the precoding matrix set according to the L candidate second precoding matrices and the M×K candidate first precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is a precoding matrix determined according to the m×k first precoding matrices and the first second precoding matrix. . In the foregoing embodiment, the access network device may limit the precoding matrix included in the precoding matrix set by limiting the second precoding matrix.

Optionally, in some embodiments, a value of at least one element in each of the L second precoding matrices is indicated by the third indication field. The terminal device may determine the L second precoding matrices according to the third indication field and the R second precoding matrix templates. Each of the R second precoding matrix templates includes at least one second non-fixed element, the third indication field is used to indicate each of the at least one second non-fixed element Candidate values for non-fixed elements. The rth second precoding matrix template in the R second precoding matrix templates is composed of r column elements, and R is a positive integer greater than or equal to 1, r=1, . . . , R.

Specifically, the second pre-coding matrix R templates r th second precoding matrix Q elements comprising a template, Q Q element includes a non-fixed second _{element. 1} and Q ₂ are second fixing element, Wherein Q = Q ₁ + Q ₂ , and both Q ₁ and Q ₂ are positive integers greater than or equal to 1. The value of each of the ₂ second fixed elements of Q is determined. Q ₁ second non-fixed element Each non-fixed element may have Y optional values, and Y is a positive integer greater than one. The third indication may include a field indicating the Q ₁ of third subfield, the Q ₁ of third sub-field indicates the non-Q ₁ second fixing element correspond. Each sub-field of the third indication the third Q ₁ indicates a sub-field comprises bits of Y, the Y bit values correspond with optional Y, the Y value of the first bit by bit y Indicates whether the yth selectable value of the Y optional values is a candidate value.

For example, the first second precoding matrix template includes a column element having four elements on the column element, the four elements being C1, D1, D2, and D3, respectively, wherein C1 indicates that the element at the position is the second Fixed elements, D1 to D3, indicate that the element at this position is the second non-fixed element. Assume that each second non-fixed element can be four The optional values are 1, -1, j, -j, where j represents an imaginary number. The first bit to the fourth bit in the third indication field correspond to the four optional values, respectively, whether the four optional values can be used as the first second in the second precoding matrix. Candidate values for non-fixed elements. Assume that the access network device determines that 1 and j are candidate values of the first element in the second precoding matrix, and the first bit of the third indication field that the access network device can send to the terminal device The value to the fourth bit is 1010, respectively. After receiving the third indication field, the terminal device may determine, according to the values of the first bit to the fourth bit of the third indication field, two candidates for the first second non-fixed element of the second precoding matrix. Value, the two candidate values are 1 and j, respectively. Similarly, the fifth to eighth bits in the third indication field correspond to the four optional values, respectively, whether the four optional values can be used as the second in the second precoding matrix. Candidate values for the second non-fixed element; and so on. In this way, the terminal device can determine a plurality of second precoding matrices according to the third indication field and the first second precoding matrix template. Similarly, the terminal device may determine, according to the third indication field and each precoding matrix template in the R second precoding matrix templates, a second precoding matrix corresponding to each second precoding matrix template. Thus, L second precoding matrices can be determined.

Optionally, in other embodiments, the terminal device may determine L second precoding matrices from the L′ second precoding matrices according to the third indication field, where L′ is greater than or equal to L. A positive integer. Determining, by the terminal device, the implementation manners of the L second precoding matrices from the L' second precoding matrices according to the third indication field, and determining, by the terminal device, the M from the N first matrices according to the first indication field The implementation of the first matrix is the same, and need not be described here. The L' second precoding matrices may be divided into R groups of second precoding matrices according to the number of column elements. The second precoding matrix included in the rth second precoding matrix in the R group second precoding matrix is composed of r column elements, where r=1, . . . , R, R is a positive integer greater than or equal to 1. .

Optionally, in another embodiment, each second precoding matrix template in the R second precoding matrix templates includes at least one second non-fixed element, where the third indication field is used to indicate the at least one row A candidate value for the second non-fixed element of each of the two non-fixed elements. The rth second precoding matrix template in the R second precoding matrix templates is composed of r column elements, and R is a positive integer greater than or equal to 1, r=1, . . . , R. The terminal device may determine the L second precoding matrices according to the third indication field and the R second precoding matrix templates.

Specifically, the rth second precoding matrix template includes Q row elements, and each of the Q row elements includes a plurality of elements. The Q ₁ row in the Q row element includes the second non-fixed element and the Q2 row element includes the second fixed element, where Q=Q ₁ +Q ₂ , Q ₁ and Q ₂ are greater than or A positive integer equal to 1. The value of the second fixed element of the Q ₂ line is determined. Q ₁ comprises a second non-fixed-line element can have optional values Y, Y is a positive integer greater than 1. The third indication field may include Q ₁ third indicator subfields, and the Q ₁ third indicator subfields are in one-to-one correspondence with the Q ₁ row. Each sub-field of the third indication the third Q ₁ indicates a sub-field comprises bits of Y, the Y bit values correspond with optional Y, the Y value of the first bit by bit y Indicates whether the yth selectable value of the Y optional values is a candidate value.

For example, the rth second precoding matrix template includes four rows of elements. The first row of elements in the four-line element are fixed elements. The second to fourth row elements are non-fixed elements, and each row element can have four optional values, respectively 1, 1, -1, j, -j, where j represents an imaginary number. The first bit to the fourth bit in the third indication field are corresponding to the four optional values, respectively, whether the four optional values can be used as the second line in the second precoding matrix is not fixed. The candidate value of the element. It is assumed that the access network device determines that 1 and j are candidate values of the second row of non-fixed elements in the second precoding matrix, and the first indication field of the third indication field that the access network device can send to the terminal device The value of the bits to the fourth bit is 1010, respectively. After receiving the third indication field, the terminal device may be according to the third The values of the first bit to the fourth bit of the indication field determine two candidate values for the second row element of the second precoding matrix, the two candidate values being 1 and j, respectively. More specifically, each of the r elements of the second row of the second precoding matrix in the L second precoding matrices has a value of 1 or j. Similarly, the fifth bit to the eighth bit in the third indication field correspond to the four selectable values, respectively, whether the four selectable values can be used as the third in the second precoding matrix. Candidate values for row elements; and so on. In this way, the terminal device can determine a plurality of second precoding matrices according to the third indication field and the rth second precoding matrix template. Similarly, the terminal device may determine, according to the third indication field and each precoding matrix template in the R second precoding matrix templates, a second precoding matrix corresponding to each second precoding matrix template. So that L second precoding matrices can be determined

The above determines that all column elements (or ranks) in the L second precoding matrices are usable according to the third indication field. In this case, the L second precoding matrices that the terminal device can determine according to the third indication field may be divided into R groups of second precoding matrices according to the number of column elements. The second precoding matrix included in the rth second precoding matrix in the R group second precoding matrix is composed of r column elements, where r=1, . . . , R, R is a positive integer greater than or equal to 1. The second precoding matrix includes at most R column elements.

Optionally, in other embodiments, the number of columns of the elements of each second precoding matrix in the L second precoding matrices is indicated by the third indication field.

Specifically, the at least one second precoding matrix that is saved or determined or preset by the terminal device and the access network device is divided into R groups of second precoding matrices according to the number of column elements. The second precoding matrix included in the rth second precoding matrix in the R group second precoding matrix is composed of r column elements, where r=1, . . . , R, R is a positive integer greater than or equal to 1. And a second precoding matrix in the at least one second precoding matrix includes at most an R column element. The third indication field may include R bits, and the R bits are in one-to-one correspondence with the R column elements. The rth bit of the R bits is used to indicate whether the second precoding matrix composed of the r column elements belongs to the L second precoding matrices.

个候选第二预编码矩阵。For example, assuming R=4, the access network device determines that the L precoding matrices are all second precoding matrices composed of 1 column element and all second precoding matrices composed of 2 column elements. The access network device can send a 4-bit fourth indication field to the terminal device. The fourth indication field is 1100. In this way, the terminal device can determine that the L second precoding matrices are composed of 1 column element or 2 column elements. It is assumed that the second precoding matrix template including one column element and the second precoding matrix template including two column elements include Z row elements in total and the Z1 row elements in the Z row elements are second non-fixed elements, Z ₂ row elements As the second fixed element, Z=Z ₁ +Z ₂ , Z is a positive integer greater than or equal to 2, and Z ₁ and Z ₂ are positive integers greater than or equal to 1. Each second non-fixed element can select four values, in which case the terminal device can determine

Candidate second precoding matrices.

For another example, assuming R=4, assuming R=4, the access network device determines that the L precoding matrices are all second precoding matrices composed of 1 column element and all second precodings composed of 2 column elements. matrix. The access network device can send a 4-bit fourth indication field to the terminal device. The fourth indication field is 1100. In this way, the terminal device can determine that the second precoding matrix is composed of one column element or two column elements. Assuming that there are a total of L' second precoding matrices, the L' second second terminal device may determine that the second precoding matrix of the L' second precoding matrices including the number of columns of elements 1 and 2 belongs to the L second precoding matrices.

为该L个第二预编码矩阵中的第l个第二预编码矩阵，W^mkl为根据该第m×k个第一预编码矩阵和该第l个第二预编码矩阵确定的预编码矩阵。In other embodiments, the precoding matrix sent by the access network device to the terminal device in the case where the third indication field is included in the precoding matrix indication information sent by the access network device to the terminal device The fourth indication field may also be included in the indication information. The terminal device may determine, according to the third indication field and the fourth indication field, L second precoding matrices, wherein at least one element in each second precoding matrix of the L second precoding matrices The value of the second indication field is indicated by the third indication field, and the number of columns of elements of each of the L second precoding matrices is indicated by the fourth indication field. In this case, the terminal device may determine the precoding matrix set according to the L second precoding matrices and the M×K candidate first precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is a precoding matrix determined according to the m×k first precoding matrices and the first second precoding matrix. .

Specifically, the terminal device may determine the L ₁ second precoding matrix based on the third indication field. The implementation manner of determining the second precoding matrix by the terminal device according to the third indication field is the same as the implementation manner of determining the second precoding matrix by the terminal device according to the third indication field in the foregoing embodiment, and details are not described herein. The terminal device determines the L second precoding matrices from the L ₁ second precoding matrices according to the fourth indication field, where L ₁ is a positive integer greater than or equal to L.

More specifically, the L ₁ second precoding matrices include at most R column elements, and the fourth indication field includes R bits. The R bits are in one-to-one correspondence with the R column elements. The rth bit of the R bits is used to indicate whether the second precoding matrix including the second precoding matrix composed of the r column elements belongs to the L second precoding matrices.

个第二预编码矩阵。For example, suppose R=4. The terminal device determines L ₁ second precoding matrices according to the third indication field. The L ₁ second precoding matrices may be divided into 4 sets of second precoding matrices, and each set of second precoding matrices in the 4 sets of second precoding matrices includes one or more second precoding matrices. Each of the second precoding matrices of the rth group of the second group of the four groups is composed of r column elements, r = 1, 2, 3, 4. The access network device determines that the second precoding matrix consisting of 1 column element and the second precoding matrix composed of 2 column elements belong to the L second precoding matrices. The access network device can send a 4-bit fourth indication field to the terminal device. The fourth indication field is 1100. In this way, the terminal device can determine that the precoding matrix in the first group of second precoding matrices and the second group of second precoding matrices in the four groups of second precoding matrices belong to the L second precoding matrices. It is assumed that the second precoding matrix includes a total of Z row elements and the Z ₁ row elements in the Z row elements are the second non-fixed elements, and the Z ₂ row elements are the second fixed elements, Z=Z ₁ +Z ₂ , Z is A positive integer greater than or equal to 2, Z1 and Z2 being positive integers greater than or equal to one. The candidate value of each second non-fixed element is two of the four available values, in which case the terminal device can determine

Second precoding matrix.

In other embodiments, the terminal device may further determine L ₂ second precoding matrices according to the fourth indication field, and then, according to the third indication field, the L ₂ second precoding matrices according to the third indication field. The L second precoding matrices are determined, wherein L ₂ is a positive integer greater than or equal to L. Determining, by the terminal device, the implementation manners of the L second precoding matrices from the L ₂ second precoding matrices according to the third indication field, and the terminal device from the N first matrices according to the first indication field It is determined that the implementations of the M first matrices are the same, and need not be described here. Or the terminal device may first determine L ₃ second precoding matrix templates according to the fourth indication field, and then determine the L second according to the third indication field and the L ₃ second precoding matrix templates. A precoding matrix, where L ₃ is a positive integer greater than or equal to one. The terminal device field L ₃ and the second precoding matrix is determined that the template a second implementation of L precoding matrix with the terminal apparatus according to the third indication field R and a second precoding matrix based on the third indication The template determines that the L second precoding matrices are implemented in the same manner, and need not be described here.

For example, assuming R=4, the access network device determines that the second precoding matrix consisting of 1 column element and the second precoding matrix composed of 2 column elements belong to the L second precoding matrices. The access network device can send a 4-bit fourth indication field to the terminal device. The fourth indication field is 1100. In this way, the terminal device can determine the first second precoding matrix template and the second second precoding matrix template in the four second precoding matrix templates. The second precoding matrix template, wherein the rth second precoding matrix template in the 4 second precoding matrix templates has r column elements, r=1, 2, 3, 4. The definition of the second precoding matrix template here is the same as the definition of the second precoding matrix template in the above embodiment, and need not be described here. The terminal device determines the L second precoding matrices according to the third indication field, the first second precoding matrix template, and the second second precoding matrix template.

For another example, assuming R=4, the access network device determines that the second precoding matrix composed of 1 column element and the second precoding matrix composed of 2 column elements belong to the L second precoding matrices. The access network device can send a 4-bit fourth indication field to the terminal device. The fourth indication field is 1100. Thus, the terminal device may determine the L ₂ second pre-coding matrix L 'second pre-coding matrix. Here, the L' second precoding matrices have the same meanings as the L' second precoding matrices in the above embodiment, and need not be described here. The L ₂ second precoding matrices are second precoding matrices in which the number of element columns in the L' second precoding matrices are 1 and 2. Then, the terminal device may determine the L second precoding matrices from the L ₂ second precoding matrices according to the third indication field.

In this embodiment of the present application, the access network device determines candidate values of each element of the M first matrix, the K second matrix, and the L second precoding matrices, the candidate values of each row element of the second precoding matrix, and the There are a plurality of ways for the number of the second pre-coding matrix elements, which is not limited by the embodiment of the present application.

206. The terminal device receives a channel state information reference signal sent by the access network device.

207. The terminal device determines channel state information according to the channel state information reference signal and the precoding matrix set.

208. The terminal device sends the channel state information to the access network device.

Steps 206 to 208 are the same as the methods for determining CSI and transmitting CSI in the prior art, and need not be described here.

FIG. 3 is a structural block diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 3, the terminal device 300 includes a receiving unit 301, a transmitting unit 302, and a processing unit 303.

The receiving unit 301 is configured to receive precoding matrix indication information from the access network device, where the precoding matrix indication information includes a first indication field and a second indication field.

The processing unit 303 is configured to determine M first matrices from the N first matrices according to the first indication field, where each first matrix in the first matrix includes a vector group consisting of at least two vectors, Where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N.

The processing unit 303 is further configured to determine K second matrices according to the second indication field, where the K second matrices are diagonal matrices, and K is a positive integer greater than or equal to 1.

为该M×K个第一预编码矩阵中的第m×k个第一预编码矩阵，

为该M个第一矩阵中的第m个第一矩阵，P^k为该K个第二矩阵中的第k个第二矩阵，

m＝1,…,M，k＝1,…,K。The processing unit 303 is further configured to use M×K first precoding matrices, where

For the m×k first precoding matrices in the M×K first precoding matrices,

For the mth first matrix of the M first matrices, P ^{k is the kth} second matrix of the K second matrices,

m=1,...,M,k=1,...,K.

The processing unit 303 is further configured to determine a precoding matrix set according to the M×K first precoding matrices.

The receiving unit 301 is further configured to receive a channel state information reference signal sent by the access network device.

The processing unit 303 is further configured to determine channel state information according to the channel state information reference signal and the precoding matrix set.

The sending unit 302 is configured to send the channel state information to the access network device.

The operations and functions of the receiving unit 301, the transmitting unit 302, and the processing unit 303 of the terminal device 300 may be referred to The description in the above method is not repeated here in order to avoid repetition.

Processing unit 303 can be implemented by a processor, and receiving unit 301 and transmitting unit 302 can be implemented by a transceiver.

FIG. 4 is a structural block diagram of an access network device according to an embodiment of the present application. As shown in FIG. 4, the access network device 400 includes a transmitting unit 401 and a receiving unit 402.

The sending unit 401 is configured to send precoding matrix indication information to the terminal device, where the precoding matrix indication information includes a first indication field and a second indication field, where the first indication field is used to indicate the N first matrices M first matrices, the second indication field is used to indicate K second matrices, each first matrix in the first matrix comprises a vector group consisting of at least two vectors, the K second matrices are For a diagonal matrix, N is a positive integer greater than or equal to 1, M is a positive integer greater than or equal to 1 and less than or equal to N, and K is a positive integer greater than or equal to 1.

The sending unit 401 is further configured to send a channel state information reference signal to the terminal device.

The receiving unit 402 is configured to receive channel state information sent by the terminal device.

For the operations and functions of the sending unit 401 and the receiving unit 402 of the access network device 400, reference may be made to the description in the foregoing method. To avoid repetition, details are not described herein again.

The transmitting unit 401 and the receiving unit 402 can be implemented by a transceiver.

Further, the access network device 400 can also include a processing unit 403, which can be implemented by a processor.

FIG. 5 is a structural block diagram of a terminal device according to an embodiment of the present invention. The terminal device 500 shown in FIG. 5 includes a processor 501, a memory 502, and a transceiver 503.

The various components in terminal device 500 communicate with one another via internal connection paths, passing control and/or data signals.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 501 or implemented by the processor 501. Processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 501 or an instruction in a form of software. The processor 501 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read only memory or an electrically erasable programmable memory, a register, etc. In the storage medium. The storage medium is located in the memory 502, and the processor 501 reads the instructions in the memory 502, in conjunction with the transceiver 503 to perform the steps performed by the terminal device in the above method.

It will be appreciated that the terminal device 500 should include, in addition to the processor 501, the memory 502 and the transceiver 503 as shown in FIG. 5, some necessary means such as an antenna, a display, an input device and the like. In order to avoid redundancy, the above device is not shown in FIG.

The processor 501 can be a processing unit 303 as shown in FIG. 3, and the transceiver 503 can be a receiving unit 301 and a transmitting unit 302.

FIG. 6 is a structural block diagram of an access network device according to an embodiment of the present invention. The access network device 600 shown in FIG. 6 includes a processor 601, a memory 602, and a transceiver 603.

The various components in the access network device 600 communicate with one another via internal connection paths to communicate control and/or data signals.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 601 or implemented by the processor 601. Processor 601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 601 or an instruction in a form of software. The processor 601 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read only memory or an electrically erasable programmable memory, a register, etc. In the storage medium. The storage medium is located in the memory 602, and the processor 601 reads the instructions in the memory 602, and the transceiver 603 performs the steps performed by the access network device in the above method.

It can be understood that the access network device 600 should include some necessary devices, such as an antenna, a cyclic prefix remover, and a fast Fourier, in addition to the processor 601, the memory 602, and the transceiver 603 as shown in FIG. Transform the processor, etc. In order to avoid redundancy, the above device is not shown in FIG.

The processor 601 may be a processing unit 403 as shown in FIG. 4, and the transceiver 603 may be a transmitting unit 401 and a receiving unit 402.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application is essentially or Portions contributing to the prior art or portions of the technical solution may be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer) , a server, or a network device, or the like, or a processor, performs all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope disclosed by the present application is The scope of protection of the present application is intended to be covered by the scope of the claims.

Claims (32)

A method for determining channel state information, the method comprising: The terminal device receives the precoding matrix indication information from the access network device, where the precoding matrix indication information includes a first indication field and a second indication field; Determining, by the terminal device, M first matrices from the N first matrices according to the first indication field, where each first matrix in the first matrix comprises a vector group consisting of at least two vectors, Where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N; Determining, by the terminal device, the K second matrices according to the second indication field, where the K second matrices are diagonal matrices, and K is a positive integer greater than or equal to 1; Determining, by the terminal device, M×K first precoding matrices, where

And being the m×k first precoding matrices in the M×K first precoding matrices,

For the mth first matrix of the M first matrices, ^Pk is the ^kth second matrix of the K second matrices,

m=1,...,M,k=1,...,K; Determining, by the terminal device, a precoding matrix set according to the M×K first precoding matrices; Receiving, by the terminal device, a channel state information reference signal from the access network device; Determining, by the terminal device, channel state information according to the channel state information reference signal and the precoding matrix set; The terminal device sends the channel state information to the access network device. The method according to claim 1, wherein the first indication field comprises N bits, and the terminal device determines M first matrices from the N first matrices according to the first indication field, include: Determining, by the nth bit of the N bits, whether the nth first matrix in the N first matrices belongs to the M first matrices, where n=1,... , N. The method according to claim 1, wherein the first indication field comprises S bits, and the terminal device determines M first matrices from the N first matrices according to the first indication field, include: Determining, by the terminal device, the first matrix corresponding to the sth bit in the N first matrices belongs to the M first matrices, according to the sth bit of the S bits, where s=1, . . . , S, S is a positive integer less than N and greater than or equal to 1, and the number of the first matrices corresponding to at least one of the S bits is a positive integer greater than or equal to 2. A method according to any one of claims 1 to 3, wherein any two vectors in the set of vectors are orthogonal. The method according to any one of claims 1 to 4, wherein the precoding matrix indication information further includes a third indication field, the method further comprising: Determining, by the terminal device, L second precoding matrices according to the third indication field, where L is a positive integer greater than or equal to 1; Determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices, including: Determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is determined according to the m×k first precoding matrices and the first second precoding matrix. Precoding matrix. The method of claim 5 wherein the value of at least one element in each of the L second precoding matrices is indicated by the third indication field. The method of claim 5 wherein the number of columns of elements of each of the L second precoding matrices is indicated by the third indication field. The method according to any one of claims 1 to 4, wherein the precoding matrix indication information further includes a third indication field and a fourth indication field, the method further comprising: the terminal device according to the Determining, by the third indication field and the fourth indication field, L second precoding matrices, wherein values of at least one element in each of the L second precoding matrices are The number of columns of the elements of each second precoding matrix in the L second precoding matrices is indicated by the fourth indication field, and L is greater than or equal to that indicated by the third indication field. a positive integer of 1; Determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices, including: Determining, by the terminal device, the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is determined according to the m×k first precoding matrices and the first second precoding matrix. Precoding matrix. A method for determining channel state information, the method comprising: The access network device sends the precoding matrix indication information to the terminal device, where the precoding matrix indication information includes a first indication field and a second indication field, where the first indication field is used to indicate the N first matrices M first matrices, the second indication field is used to indicate K second matrices, each first matrix in the first matrix comprises a vector group consisting of at least two vectors, the K second The matrix is a diagonal matrix, N is a positive integer greater than or equal to 1, M is a positive integer greater than or equal to 1 and less than or equal to N, and K is a positive integer greater than or equal to 1; Transmitting, by the access network device, a channel state information reference signal to the terminal device; The access network device receives channel state information from the terminal device. The method according to claim 9, wherein said first indication field comprises N bits, and an nth bit of said N bits is used to indicate an nth of said N first matrices Whether the first matrix belongs to the M first matrices, where n=1, . . . , N. The method according to claim 9, wherein the first indication field comprises S bits, and the sth bit of the S bits is used to indicate the N first matrix and the first Whether the first matrix corresponding to the s bits belongs to the M first matrices, wherein s=1, . . . , S, S is a positive integer less than N and greater than or equal to 1, at least one of the S bits The number of first matrices corresponding to the bits is a positive integer greater than or equal to two. A method according to any one of claims 9 to 11, wherein any two vectors in the set of vectors are orthogonal. The method according to any one of claims 9 to 12, wherein the precoding matrix indication information further includes a third indication field, where the third indication field is used to indicate L second precoding matrices, Where L is a positive integer greater than or equal to 1. The method of claim 13 wherein the value of at least one element in each of the L second precoding matrices is indicated by the third indication field. The method of claim 13 wherein the number of columns of elements of each of the L second precoding matrices is indicated by the third indication field. The method according to any one of claims 9 to 12, wherein the precoding indicating information further comprises a third indication field and a fourth indication field, the third indication field and the fourth The indication field is used to indicate L second precoding matrices, wherein values of at least one element in each of the L second precoding matrices are indicated by the third indication field The number of columns of the elements of each of the L second precoding matrices is indicated by the fourth indication field, and L is a positive integer greater than or equal to 1. A terminal device, the terminal device includes: a receiving unit, configured to receive precoding matrix indication information from the access network device, where the precoding matrix indication information includes a first indication field and a second indication field; a processing unit, configured to determine M first matrices from the N first matrices according to the first indication field, where each first matrix in the first matrix includes a vector group consisting of at least two vectors Where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1 and less than or equal to N; The processing unit is further configured to determine, according to the second indication field, K second matrices, where the K second matrices are diagonal matrices, and K is a positive integer greater than or equal to 1; The processing unit is further configured to determine M×K first precoding matrices, where

And being the m×k first precoding matrices in the M×K first precoding matrices,

For the mth first matrix of the M first matrices, ^Pk is the ^kth second matrix of the K second matrices,

m=1,...,M,k=1,...,K; The processing unit is further configured to determine a precoding matrix set according to the M×K first precoding matrices; The receiving unit is further configured to receive a channel state information reference signal from the access network device; The processing unit is further configured to determine channel state information according to the channel state information reference signal and the precoding matrix set; And a sending unit, configured to send the channel state information to the access network device. The terminal device according to claim 17, wherein the first indication field comprises N bits, and the processing unit is configured to determine the N according to an nth bit of the N bits. Whether the nth first matrix in the first matrix belongs to the M first matrices, where n=1, . . . , N. The terminal device according to claim 17, wherein the first indication field includes S bits, and the processing unit is configured to determine the N according to the sth bit of the S bits. Whether the first matrix corresponding to the sth bit in the first matrix belongs to the M first matrices, where s=1, . . . , S, S is a positive integer less than N and greater than or equal to 1, The number of the first matrices corresponding to at least one of the S bits is a positive integer greater than or equal to 2. The terminal device according to any one of claims 17 to 19, characterized in that any two vectors in the vector group are orthogonal. The terminal device according to any one of claims 17 to 20, wherein the precoding matrix indication information further includes a third indication field, and the processing unit is further configured to: according to the third indication field, Determining L second precoding matrices, wherein L is a positive integer greater than or equal to 1; The processing unit is configured to determine the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is determined according to the m×k first precoding matrices and the first second precoding matrix. Precoding matrix. The terminal device according to claim 21, wherein a value of at least one element in each of the L second precoding matrices is indicated by the third indication field . The terminal device according to claim 21, wherein the number of columns of elements of each of the L second precoding matrices is indicated by the third indication field. The terminal device according to any one of claims 17 to 20, wherein the precoding matrix indication information further includes a third indication field and a fourth indication field, and the processing unit is further configured to a third indication field and the fourth indication field, determining L second precoding matrices, wherein values of at least one element in each of the L second precoding matrices are As indicated by the third indication field, the number of columns of the elements of each of the L second precoding matrices is indicated by the fourth indication field, and L is greater than or equal to 1 Positive integer The processing unit is configured to determine the precoding matrix set according to the M×K first precoding matrices and the L second precoding matrices, where

For the first second precoding matrix in the L second precoding matrices, W ^mk1 is determined according to the m×k first precoding matrices and the first second precoding matrix. Precoding matrix. An access network device, where the access network device includes: a sending unit, configured to send precoding matrix indication information to the terminal device, where the precoding matrix indication information includes a first indication field and a second indication field, where the first indication field is used to indicate N first matrices M first matrices, the second indication field is used to indicate K second matrices, each first matrix in the first matrix includes a vector group consisting of at least two vectors, the K first The two matrices are diagonal matrices, N is a positive integer greater than or equal to 1, M is a positive integer greater than or equal to 1 and less than or equal to N, and K is a positive integer greater than or equal to 1; The sending unit is further configured to send a channel state information reference signal to the terminal device; And a receiving unit, configured to receive channel state information from the terminal device. The access network device according to claim 25, wherein the first indication field comprises N bits, and an nth bit of the N bits is used to indicate in the N first matrices Whether the nth first matrix belongs to the M first matrices, where n=1, . . . , N. The access network device according to claim 25, wherein the first indication field comprises S bits, and the sth bit of the S bits is used to indicate that the N first matrices are Whether the first matrix corresponding to the sth bit belongs to the M first matrices, where s=1, . . . , S, S is a positive integer smaller than N and greater than or equal to 1, in the S bits The number of first matrices corresponding to at least one bit is a positive integer greater than or equal to two. An access network device according to any one of claims 25 to 27, wherein any two vectors in the set of vectors are orthogonal. The access network device according to any one of claims 25 to 28, wherein the precoding matrix indication information further includes a third indication field, where the third indication field is used to indicate L second pre-predictions An encoding matrix, where L is a positive integer greater than or equal to one. The access network device according to claim 29, wherein said L second precoding matrices The value of at least one element in each second precoding matrix is indicated by the third indication field. The access network device according to claim 29, wherein the number of columns of elements of each of the L second precoding matrices is indicated by the third indication field . The access network device according to any one of claims 25 to 28, wherein the precoding indication information further includes a third indication field and a fourth indication field, the third indication field and the location The fourth indication field is used to indicate L second precoding matrices, wherein values of at least one element in each of the L second precoding matrices are determined by the third indication As indicated by the field, the number of columns of elements of each of the L second precoding matrices is indicated by the fourth indication field, and L is a positive integer greater than or equal to 1.

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