KR102555344B1 - Method for transmitting and receiving channel state information, terminal device and network device - Google Patents

Abstract

The present application discloses a method for transmitting and receiving channel state information, a terminal device, and a network device, and provides a method for transmitting and receiving CSI based on a codebook structure of Rel-16. A method for transmitting channel state information comprises determining a compressed base vector in a precoding matrix, the compressed base vector belonging to a set of candidate base vectors, wherein the compression weighted by coefficients of the precoding matrix The base vector obtained is used to construct frequency domain characteristics of the precoding matrix; and transmitting the channel state information to a network device, wherein the channel state information includes base vector indication information, and the base vector indication information comprises: It includes being used to represent the compressed base vector.

Description

Method for transmitting and receiving channel state information, terminal device and network device

This application, Application No. 201910028794.5 filed with the Chinese Intellectual Property Office on January 11, 2019, claims priority to a Chinese patent application titled “Method for transmitting and receiving channel state information, terminal device and network device”, The entire content of the above Chinese patent application is hereby incorporated by reference into the application and is made a part of this application.

This application, Application No. 201910116370.4, filed with the Chinese Intellectual Property Office on February 15, 2019, claims priority to a Chinese patent application titled “Method for transmitting and receiving channel state information, terminal device and network device”, The entire content of the above Chinese patent application is hereby incorporated by reference into the application and is made a part of this application.

This application, Application No. 201910346490.3, filed with the Chinese Intellectual Property Office on April 26, 2019, claims priority to a Chinese patent application titled “Method for transmitting and receiving channel state information, terminal device and network device”, The entire content of the above Chinese patent application is hereby incorporated by reference into the application and is made a part of this application.

The present invention belongs to the field of communication technology, and more particularly, to a method for transmitting and receiving channel state information, a terminal device, and a network device.

In the NR (New Radio) system, a Type II (Type II) codebook is defined. The Rel-15 Type II codebook is based on linear combining of orthogonal beams and supports rank 1 and rank 2 codebooks. Since the number of coefficients of the codebook with Rank = 2 is about twice the number of coefficients in the codebook with rank = 1, when the rank indications (Rank Indication, RI) take different values, the codebooks have a large difference in overhead, The overhead is high when the terminal device feeds back channel state information (CSI) based on the Rel-15 Type II codebook.

When the network device receives the CSI fed back from the terminal device, it cannot determine the size of the CSI overhead because it cannot know the RI value before accurate decoding. To prevent network devices from being unable to correctly decode CSI due to overhead ambiguity, Rel-15 adopts a two-part structure for each subband for Type II CSI reporting. While the first part of CSI has a fixed overhead independent of the value of RI, the overhead of the second part of CSI can be determined by the decoding result of the first part, so that the problem of overhead ambiguity can be avoided. do. Since the feedback for each subband includes both the phase coefficient of the subband and the amplitude coefficient of the subband, when there are many subbands, the feedback of the coefficients of all the subbands requires high feedback overhead. For this reason, Rel-16 provides a Type II codebook with low overhead, and the Type II codebook with low overhead is a method of linear combination and subband coefficient compression for orthogonal beams, that is, the coefficients of each subband are compressed and compressed. The resulting coefficients are fed back to network devices to lower overhead.

Currently, for the codebook structure of Rel-16, there is no corresponding transmission or reception mechanism for CSI.

Embodiments of the present application provide a method for transmitting and receiving channel state information, a terminal device, and a network device used to provide a method for transmitting or receiving CSI based on a codebook structure of Rel-16.

In a first aspect, a method for transmitting channel state information is provided. The method,

determining a compressed base vector from a precoding matrix, the compressed base vector belonging to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct the frequency domain characteristics of; and

Transmitting channel state information to a network device, wherein the channel state information includes base vector indication information, and the base vector indication information is used to indicate the compressed base vector.

is included.

In a second aspect, a method for receiving channel state information is provided. The method,

Receiving channel state information from a terminal device, wherein the channel state information includes base vector indication information, the base vector indication information is used to indicate a base vector compressed in a precoding matrix, and the compressed A base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct frequency domain characteristics of the precoding matrix; and

and parsing the channel state information according to the compressed base vector.

In a third aspect, a memory configured to store instructions; a transceiver used to transmit information under the control of a processor; and a processor configured to read instructions from the memory;

The processor determines a compressed base vector from a precoding matrix, the compressed base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is Used to construct frequency domain characteristics of a coding matrix;

Send channel state information to a network device, wherein the channel state information includes base vector indication information, and the base vector indication information is used to indicate the compressed base vector.

In a fourth aspect, a memory configured to store instructions; a transceiver used to transmit information under the control of a processor; and a processor configured to read instructions from the memory;

The processor receives channel state information from a terminal device, wherein the channel state information includes base vector indication information, and the base vector indication information is used to indicate a base vector compressed in a precoding matrix; A compressed base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct frequency domain characteristics of the precoding matrix;

The channel state information is parsed according to the compressed base vector.

In a fifth aspect, there is provided a terminal device including a determining unit and a transmitting unit, the determining unit being configured to determine a compressed base vector in a precoding matrix, the compressed base vector belonging to a set of candidate base vectors; The vector weighted by the coefficients of the compressed base precoding matrix is used to construct frequency domain characteristics of the precoding matrix; and the sending unit is configured to send channel state information to a network device, the channel state information including base vector indication information, and the base vector indication information used to indicate the compressed base vector.

In a sixth aspect, there is provided a network apparatus including a receiving unit and a parsing unit, wherein the receiving unit is configured to receive channel state information from a terminal device, the channel state information including basic vector indication information, and a base vector indication Information is used for: Represents a compressed base vector of a precoding matrix, the compressed base vector belongs to a set of candidate base vectors, and the compressed base vector weighted by the coefficients of the precoding matrix is used to construct frequency domain characteristics of the precoding matrix, ; and the parsing unit is configured to parse the channel state information according to the compressed base vector.

In a seventh aspect, a computer readable storage medium is provided, wherein the computer readable storage medium stores computer instructions, and when the computer is executed on the computer, the computer instructions cause the computer to perform the above first or second aspect. to execute one of the methods.

In the embodiments of the present application, the channel state information transmitted by the terminal device to the network device includes base vector indication information, and indicates a compressed base vector adopted for weighting of coefficients of a precoding matrix by the terminal device; Therefore, the network device determines the channel state reported by the terminal device by parsing the received channel state information by determining a precoding matrix to be used according to the compressed base vector, beams in the precoding matrix, and coefficients of the precoding matrix.

1 is a schematic flowchart of a method for transmitting or receiving channel state information provided by an embodiment of the present application.
2 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
3 is another schematic structural diagram of a terminal device provided by an embodiment of the present application.
4 is a schematic structural diagram of a network device provided by an embodiment of the present application.
5 is another schematic structural diagram of a network device provided by an embodiment of the present application.

To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

During the communication process, the network device needs to perform precoding and scheduling to collect CSI of all terminal devices and minimize interference between signals of the terminal devices. The terminal device may divide the entire system bandwidth into a plurality of subbands and feedback CSI of all subbands to the network device. The network device generates a precoding matrix of the entire system bandwidth according to the CSI sent by the terminal device, and maps the transport layer to the antenna port using the precoding matrix. In this specification, a transport layer is referred to as a precoding module, and each transport layer represents a data stream transmitted independently in a spatial domain or a beam domain. The transport layer mapped by the precoding matrix of the entire system bandwidth includes at least two transport layers. In the following description of the embodiments of the present application, two transport layers are described as an example, and the two transport layers are transport layer I and transport layer II, respectively.

In an embodiment of the present application, the network device determines the precoding matrix of each transport layer according to the orthogonal beams of the precoding matrix, the coefficients of the precoding matrix, and the compressed base vector, based on the codebook structure of Rel-16. Since the CSI sent by the terminal device to the network device may indicate a compressed base vector, the network device may determine a precoding matrix. Coefficients of the precoding matrix are beamforming weights used by the precoding matrix to map each transport layer.

The CSI transmitted by the terminal device to the network device includes two parts, namely, a first part of the CSI and a second part of the CSI. As shown in Table 1, the first part of the CSI is mapped by RI, a wideband channel quality indication (CQI) corresponding to the first codeword, a differential CQI corresponding to the first codeword, and the transport layer. Includes quantities whose coefficients are zero. It is equal to the number of zero coefficients of transport layer I (number of zero coefficients in Table 1 - 1) and the number of zero coefficients of transport layer II (number of zero coefficients in table - 2). In embodiments of the present application, a zero coefficient refers to a coefficient treated as zero.

RI Wideband CQI-1 Differential CQI-1 number of zero coefficients -1 number of zero coefficients -2

As shown in Table 2, the second part of the CSI is the rotation factor, beam indication information, strongest beam indication - 1 (strongest beam indication of transport layer I), wideband amplitude coefficient - 1 (coefficient of wideband amplitude transmission layer I), most Strong beam indication - 2 (strongest beam indication of transport layer II), wideband amplitude factor - 2 (wideband amplitude factor of transport layer II), even subband phase bands, and subband phases of odd subbands. The subband phase of even-numbered subbands may be replaced with subband amplitude coefficients of even-numbered subbands, or may be replaced with subband phases of even-numbered subbands and subband amplitude coefficients of even-numbered subbands. The subband phase of the odd subband may be replaced with the subband amplitude coefficient of the odd subband, or may be replaced with the subband phase and subband amplitude coefficient of the odd subband.

spin factor
beam
mark Show Strongest Beam - 1 Broadband Amplitude Coefficient -1 Show Strongest Beam - 2 Broadband Amplitude Factor -2 At least one of subband amplitude and phase of even-numbered subbands At least one of subband amplitude and phase of odd subbands

（1）A huge system overhead is required to transmit the coefficients of all subbands to the network device by the terminal device. Therefore, Rel-16 of the NR system defines a Type II codebook with low overhead, and taking a rank 1 codebook for all subbands as an example, Equation (1) of the rank 1 codebook is as follows.

(One)

는 직교 결합빔을 나타내며, 2L 개의 빔을 포함하고,

는 L번째 빔이며,

은 서브밴드의 압축 계수를 나타내며, 모든 서브밴드가 공유하고,

는 진폭 계수를 나타내고,

는 위상 계수를 나타내고,

는 압축된 기본 벡터 （

）의 켤레 매트릭스를 나타내고 M 개의 기본 벡터를 포함하고, 각 벡터의 길이는 N이고, N은 서브밴드의 수에 의해 결정되고, N은 일부의 서브밴드의 수이고, 모든 서브밴드의 수일 수도 있다. 단말 장치는 Rel-16에 정의된 Type II 코드북에 기초하여 각 서브밴드의 계수를 압축하고, 압축된 계수를 네트워크 장치에 전송할 수 있다. 그러나 현재 Rel-16의 코드북 구조에는 CSI에 대응하는 송신 또는 수신 메커니즘이 없다.In Equation (1),

Represents an orthogonally combined beam, includes 2L beams,

Is the Lth beam,

denotes the compression coefficient of the subband, shared by all subbands,

represents the amplitude coefficient,

represents the phase coefficient,

is the compressed base vector （

) represents a conjugate matrix of M base vectors, the length of each vector is N, N is determined by the number of subbands, N is the number of some subbands, and may be the number of all subbands. . The terminal device may compress coefficients of each subband based on the Type II codebook defined in Rel-16 and transmit the compressed coefficients to the network device. However, there is no transmission or reception mechanism corresponding to CSI in the current codebook structure of Rel-16.

In this respect, an embodiment of the present application provides a method for transmitting CSI. In this method, the channel state information transmitted by the terminal device to the network device includes base vector indication information, and indicates the compressed base vector adopted for the weighting of the coefficients of the precoding matrix by the terminal device, and thus the network device determines the precoding matrix used for all of the plurality of subbands distributed in the system bandwidth according to the compressed base vector, the orthogonal beams in the precoding matrix, and the coefficients of the precoding matrix, and parses the received channel state information to the terminal device. Determines the channel status reported by

Technical solutions provided by the embodiments of the present application are introduced below with accompanying drawings.

Referring to Figure 1. Referring to FIG. 1 , an embodiment of the present application provides a method for transmitting channel state information. The flow of the method is described as follows. Since the method for transmitting channel state information relates to an interaction process between a network device and a terminal device, the flow description below describes the process executed by the network device and the terminal device together.

S101: The terminal device determines a base vector compressed in a precoding matrix.

In the embodiments of the present application, the terminal device may inform the network device of the compressed base vector for compressing the coefficients of the precoding matrix, and the compressed base vector weighted by the coefficients of the precoding matrix is the frequency of the precoding matrix. Used to configure area properties. Therefore, the network device determines a precoding matrix for mapping each of the two transport layers according to the codebook structure of Rel-16, the orthogonal beam, the coefficients of the precoding matrix and the compressed base vector, and the coefficients and terminals of the precoding matrix Parse the received channel state information to determine the channel state reported by the device.

Before the terminal device notifies the network device of the compressed base vector, the compressed base vector used for weighting the coefficients of the precoding matrix can be determined. Coefficients of the precoding matrix may be beamforming weight values used by the precoding matrix to map each transport layer. The compressed base vector may be a base vector selected from a set of candidate base vectors, where the set of candidate base vectors may be understood as a predefined set of base vectors. The set of candidate base vectors may include a plurality of base vectors corresponding to all subbands from which the entire system is divided. The compressed base vector is composed of a base vector selected from a set of candidate base vectors corresponding to each subband, and is used to compress coefficients of all subbands. For example, the compressed base vector can be represented by the following matrix.

The matrix is illustrated as including M rows and N columns, where N may be the number of all subbands, each column corresponding to a compressed base vector of each subband, and the compressed base vector is M base vectors. includes

In a possible implementation, the terminal device may determine the compressed base vector according to a configuration from a network device or a predefined rule. For example, the terminal device may determine the compressed base vector according to configuration information from the network device, and the terminal device may also determine the compressed base vector according to preset zero coefficient information. Each is introduced below.

The terminal device determines the compressed base vector according to the configuration information from the network device, and before the terminal device sends the channel state information to the network device, the network device may perform the following steps.

Step S1011: The network device may transmit configuration information to the terminal device. The configuration information may be used to indicate the number of compressed base vectors. The number of subbands corresponding to the channel state information and the precoding matrix map at least one of the number of beams corresponding to each transport layer. A subband corresponding to the channel state information may be understood as a subband fed back by the terminal device. A compressed base vector used for each subband is determined according to terminal device configuration information. In the embodiment of the present application, step S1011 is optional, so the step is shown in dotted lines in FIG. 1 .

The network device may not transmit configuration information to the terminal device. In this case, the terminal device may determine the compressed base vector according to predefined configuration information. For example, a set of base vectors corresponding to each subband is predefined, and a rule for selecting a compressed base vector from the set of base vectors corresponding to each subband is predefined. and determining a compressed basis vector corresponding to the precoding matrix according to the received configuration information and a set of basis vectors corresponding to each subband.

Of course, in a possible implementation, the terminal device determines the compressed base vector of the precoding matrix according to the configuration information from the network device and the predefined configuration information. In this case, configuration information may be set according to predefined configuration information.

After the terminal device determines the compressed base vector in the precoding matrix, the terminal device notifies the network device of the compressed base vector. Specifically, continued reference is made to FIG. 1 . In step S102, the terminal device transmits channel state information to the network device.

The channel state information transmitted by the terminal device to the network device may include basic vector display information. The base vector indication information represents a compressed base vector corresponding to each subband. In the embodiments of the present application, the basic vector display information may be implemented in the following two ways.

First mode: The base vector display information is a first bitmap, and one bit of the first bitmap corresponds to the position of one base vector of compressed base vectors in a set of candidate base vectors.

For example, the set of candidate base vectors includes N base vectors and the length of the first bitmap is N. If the compressed base vector of each subband includes M base vectors, it may be preset to include N bits, the value of M bits among the N bits is 1, the value of the remaining N-M bits is 0, and the M bits are corresponds to the location of the base vector, and at this time, a base vector corresponding to M bits having a value of 1 is selected from N base vectors. That is, M base vectors form a compressed base vector of one subband, where both N and M are integers greater than or equal to 1.

For better understanding, it is assumed that the set of candidate base vectors of one subband includes 13 base vectors and base vector display information is shown in Table 3.

One One One 0 0 One 0 0 0 One One 0 One

A bit with a value of 1 indicates that the base vector is adopted, while a bit with a value of 0 indicates that the base vector is not used. Thus, the compressed base vectors include base vectors {0, 1, 2, 5, 9, 10, 12}.

Second way: The base vector indication information is a combination of base vector indices in a set of candidate base vectors included in the compressed base vector.

For example, the set of candidate base vectors includes N base vectors, and the length of the bitmap is N. Assuming that the compressed base vector of each subband includes M base vectors, the indices of M elements are, for example, {2, 3, 5... }.

Here, 2 represents the second base vector among the N base vectors, 3 represents the third base vector among the N base vectors, and 5 represents the third base vector among the N base vectors.

For ease of understanding, when the set of candidate base vectors of one subband includes 13 base vectors and the base vector display information is the index set {2, 3, 5}, the compressed base vector of one subband contains the base vector {2,3,5}.

In the embodiments of the present application, the base vector indication information may be carried in the first part of the channel state information, or the second part of the channel state information, or both the first part and the second part of the channel state information.

The precoding matrix may use the same set of base vectors to map the two transport layers, such as the first base vector set of base vectors, or may use different sets of base vectors. For example, in case of transport layer I, a first base vector set is used, and in case of transport layer II, a second base vector set is used. Here, both the first base vector set and the second base vector set are derived from the candidate base vector set. Even if the precoding matrix uses the same base vector set to map the two transmission layers, for a plurality of beams corresponding to the same transmission layer, the plurality of beams use the same base vector set, for example, a third base vector set, or , a different set of basis vectors can be used. For example, in the case of transport layer I, the third base vector set is used, and in the case of transport layer II, the fourth base vector set is used. Here, the third base vector set is derived from the base vector set used for transport layer I, and the fourth base vector set is derived from the base vector set used for transport layer II.

Carrying of base vector display information of channel state information according to the situation in which the precoding matrix uses the same or different base vector sets for mapping two transport layers and the case in which a plurality of beams use the same or different base vector sets The method may also be different. In a possible implementation, the conveying scheme of base vector indication information in channel state information may include the following. The following illustrates that the number of subbands is N, the number of beams corresponding to each transport layer is 2L, and the compressed base vector includes M base vectors.

For ease of understanding, it is assumed that a Type II codebook with Rank = 2 is used, and the precoding matrix of transport layer I can be expressed as follows.

（2）

(2)

The precoding matrix of transport layer II can be expressed as:

（3）

(3)

는 2L개의 빔을 포함하고,

및

는 압축된 기본 벡터이며 각각에 M 개의 기본 벡터가 포함된다. 이때 각 전송 계층에 대응하는 서브밴드의 계수는 2L*M이다. In Equation (2) and Equation (3),

contains 2L beams,

and

is a compressed base vector, each of which contains M base vectors. At this time, the coefficient of the subband corresponding to each transport layer is 2L*M.

Case 1: 2L beams corresponding to each of the at least two transport layers mapped by the precoding matrix use the same base vector set, and the at least two transport layers use the same compressed base vector.

와

는 동일하다. 이때, 기본 벡터 표시 정보는 채널 상태 정보의 제1 부분， 즉, CSI의 Part one에 위치할 수 있다. 또는 기본 벡터 표시 정보는, 채널 상태 정보의 제2 부분, 즉, CSI의 Part two에 위치할 수 있다. The base vector indication information may be located in the first part of the channel state information or the second part of the channel state information. For example, taking two transport layers as an example, if transport layer I and transport layer II use the same compressed base vector, that is,

and

is the same In this case, the basic vector indication information may be located in the first part of the channel state information, that is, Part One of the CSI. Alternatively, the base vector indication information may be located in the second part of the channel state information, that is, Part two of the CSI.

Second case: 2L beams corresponding to each of the at least two transport layers mapped by the precoding matrix use the same base vector set, and one transport layer among the at least two transport layers uses the negotiated compressed base vector use.

The base vector indication information may be located in the first part of the channel state information, the second part of the channel state information, or both the first and second parts of the channel state information. In the first case, if the basic vector display information is located in the first part of the channel state channel, in the second case, the base vector display information is located in the second part of the channel state information, or the first part and the second part of the channel state information. can In the first case, if the basic vector display information is located in the second part of the channel state channel, in the second case, the base vector display information is located in the first part of the channel state information or in the first and second parts of the channel state information. can

Specifically, when the basic vector display information is located in the first part and the second part of the channel state information, the basic vector display information may include the first sub-display information and the second sub-display information, and the first sub-display information The information is included in the first part of the channel state information and the second sub-display information is included in the second part of the channel state information.

In a possible implementation, the first sub-display information is used to indicate compressed base vectors corresponding to parts of the at least two transport layers, and the second sub-display information is used to indicate other transport layers other than some transport layers of the at least two transport layers. Used to indicate the corresponding compressed base vector.

For example, taking two transport layers as an example, the first sub-display information may be used to indicate a compressed base vector used for transport layer I, and the second sub-display information may be used to indicate a compressed base vector used for transport layer II. Used to display basis vectors. Taking three transport layers as another example, the first sub-indication information can be used to indicate two transport layers, for example indicating compressed base vectors used for transport layer I and transport layer II. . The second sub-display information indicates a compressed base vector used for transport layer III. Alternatively, the first sub-indication information indicates a compressed base vector used for one transport layer, eg, transport layer I. The second sub-display information indicates compressed base vectors used for transport layer II and transport layer III.

In a possible implementation, the first subindication information indicates a set of base vectors used for at least two transport layers. The second sub-display information indicates a base vector set used in each of at least two transport layers.

Here, taking two transport layers as an example, the base vector set used in the two transport layers is also called an absolute base vector set, and the base vector set in which the compressed base vector used in transport layer I is located and the base vector set used in transport layer II are located. represents the union of the set of basis vectors in which the compressed basis vectors are located. The base vector set used in each transport layer is also referred to as a relative base vector set, and the second sub display information indicates a first relative base vector set and a second relative base vector set. The first relative base vector set is a base vector set in which a compressed base vector used for transport layer I is located and belongs to a subset of the absolute base vector set. The second relative base vector set is a base vector set in which a compressed base vector used for transport layer II is located and belongs to a subset of the absolute base vector set. For better understanding, the absolute set of basis vectors and the relative set of basis vectors are introduced below with specific examples.

It is assumed that the candidate base vectors include 13 base vectors, and that the first part of the base vector display information, that is, the absolute set of base vectors, represents a length of 13 bits as shown in Table 4.

One One One 0 0 One 0 0 0 One One 0 One

A bit with a value of 1 indicates that the base vector is adopted, while a bit with a value of 0 indicates that the base vector is not used. Thus, the set of absolute basis vectors contains the basis vectors {0,1,2,5,9,10,12}.

The relative set of base vectors of the transport layer I indicated by the second sub-display information may be used to indicate an index set having a length of M=4, and indicates the position of the base vector of the relative base vector set in the absolute base vector set. For example, {0,1,2,3} denotes a base vector {0,1,2,5} of an absolute base vector set, forming a first relative base vector set. Similarly, the second set of relative basis vectors represents the set of indices of length M=4 (e.g. {1, 4, 5, 6}) and the basis vectors {1,9,10,12} of the set of absolute basis vectors and forms a second set of relative basis vectors. In a possible implementation, the first sub-indication information indicates the number of base vectors in the set of base vectors used in the at least two transport layers, and the second sub-indication information indicates the set of base vectors used in the at least two transport layers and the number of base vectors in the set of base vectors used in the at least two transport layers. Indicates the set of base vectors used for each layer.

For example, taking two transport layers as an example, the first sub-display information may indicate the number of base vectors included in the absolute base vector set, and the second sub-display information may indicate the absolute base vector set, the first relative base vector set, and the first relative base vector set. A vector set and a second relative basis vector set may be displayed. For example, the first sub-display information indicates 6, the second sub-display information includes an index set {0, 2, 3, 5, 8, 9} representing an absolute base vector set, and the base vector in the index set. represents 0, 2, 3, 5, 8, 9, i.e. the set of absolute basis vectors is {0, 2, 3, 5, 8, 9}. The first subdisplay information further includes an index set {0, 1, 2, 3} representing the first relative base vector set, and the first four base vectors in the absolute base vector set, that is, base vectors {0, 2, 3 , 5}. The first sub-display information further includes an index set {1, 2, 4, 5} indicating a second relative base vector set, and four base vectors in the absolute base vector set, that is, {2,3,8,9} indicates

In a possible implementation, the first subindication information indicates the number of base vectors in the set of base vectors used for at least two transport layers. The second sub-display information indicates a base vector set used in each of at least two transport layers.

For example, taking two transport layers as an example, the first sub-display information may indicate the number of base vectors included in the absolute base vector set, and the second sub-display information may indicate the first relative base vector set and the second relative base vector set. Represents a set of basis vectors. For example, the first sub-display information indicates 6, the second sub-display information further includes an index set {0, 1, 2, 3} representing the first relative base vector set of the base vector, and the absolute base vector Represents the first 4 basis vectors in the set. A set of absolute basis vectors. The first sub-display information further includes an index set {1, 2, 4, 5} of the second relative base vector set, and the index set indicates four base vectors in the absolute base vector set.

In a possible implementation, the first sub-indication information is used to indicate the number of base vectors in the set of base vectors used in the at least two transport layers and the second sub-indication information is used to indicate the set of base vectors used in each of the at least two transport layers. When indicated, a base vector in the set of base vectors used in each of the at least two transport layers is selected from the set of candidate base vectors. Base vectors included in the candidate base vector set are predefined by the system and determined according to the first sub-display information.

In this specification, the candidate base vector set may be understood as the absolute base vector set. However, the base vectors included in the candidate base vector set may not be indicated by the second sub-display information, but the base vectors predefined by the system. is a set of vectors. Meanwhile, the system determines a set of candidate base vectors according to the first sub-display information.

In an embodiment of the present application, to realize that the first subindication information is used to indicate the number of base vectors in a set of base vectors used in at least two transport layers, there may be the following implementation.

비트를 차지하며, 여기서, N₃는 후보 기본 벡터 집합에 포함된 기본 벡터의 수이다. (1) The first sub display information

bits, where N ₃ is the number of base vectors included in the set of candidate base vectors.

로 설정되며, 즉

이다. 제1 서브표시 정보는 CSI의 제1 부분에 실려 있고,

비트 （bits）를 차지하여 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수를 표시한다. 아래에서 설명을 쉽게 하기 위해, 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수는 N₃’ 로 표시된다.For example, it is assumed that 13 subbands exist in the system, that is, the number of base vectors included in the candidate base vector set is 13, and this number is

is set, that is

am. The first subdisplay information is carried in a first part of the CSI;

Occupies bits to indicate the number of base vectors in the set of base vectors used in at least two transport layers. For ease of explanation below, the number of base vectors in a set of base vectors used in at least two transport layers is denoted by N ₃ '.

For example, in the case where the first bit among 4 bits is used as the most significant digit and the last bit is used as the lowest digit, N ₃ '=6 when 4 bits are expressed as 0110.

In this case, the second sub display information may indicate a base vector set used for at least two transport layers in the bitmap mode. Meanwhile, the second sub-display information may also indicate a base vector used for each transport layer. For example, the second subdisplay information includes two parts, one of the two parts is one bitmap, and one bit of the bitmap is a set of base vectors used in at least two transport layers in a set of candidate base vectors. correspond to the location. Specifically, reference may be made to the foregoing display scheme for the set of absolute basis vectors, which is not repeated here. The other part is also a bitmap, and one bit of the bitmap corresponds to a position of a base vector used for each transport layer in a set of base vectors used for at least two transport layers. For example, the second sub display information may be a bitmap shown in Table 5.

One 0 One One 0 0 One 0 0 0 One One 0

비트를 차지하여 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합을 표시하도록 한다. 여기서,

은 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수이고, N₃은 후보 기본 벡터 집합 내의 기본 벡터의 수이다. 예를 들어, 제2 서브표시 정보는

bits를 차지하여 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합을 표시한다. or the second sub-display information

bits to indicate the set of base vectors used in at least two transport layers. here,

is the number of base vectors in the base vector set used in at least two transport layers, and N ₃ is the number of base vectors in the candidate base vector set. For example, the second sub-display information is

bits to indicate the set of base vectors used for at least two transport layers.

비트를 차지하고, 여기서,

는 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 합이고,

는 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 최대값이다. (2) The first sub display information

occupy a bit, where

is the sum of the number of base vectors used in each of the at least two transport layers,

is the maximum value of the number of base vectors used in each of the at least two transport layers.

이고, 여기서,

는 RI가 i일 때 시스템에 의해 단말 장치의 전송 계층 0, 전송 계층 1, …, 전송 계층 i에 대해 구성된 압축된 기본 벡터의 수

,

, …,

의 최대값이다.

， 여기서,

는 RI가 i일 때 시스템에 의해 단말 장치의 전송 계층 0, 전송 계층 1, …, 전송 계층 i에 대해 구성된 압축된 기본 벡터의 수

,

, …,

합계의 최대값을 나타낸다.for example,

and, here,

is the transport layer 0, transport layer 1, ... of the terminal device by the system when RI is i. , the number of compressed base vectors constructed for transport layer i

,

, … ,

is the maximum value of

, here,

is the transport layer 0, transport layer 1, ... of the terminal device by the system when RI is i. , the number of compressed base vectors constructed for transport layer i

,

, … ,

represents the maximum value of the sum.

Assuming that there are 13 subbands in the system, the base station configures the number of compressed base vectors of each transport layer to be M for the terminal device through higher layer signaling when the value of RI is different according to Table 6 .

RI transport layer M One 0 M0= M1=7 2 0 One 3 0 M0= M1=7 One 2 M2 =4 4 0 M0= M1=7 One 2 M2= M3=4 3

이고, N₃’의 최대값은

이다. 본 출원의 실시예에서, 제1 표시 정보는

bits를 통해 N₃’의 값을 나타낸다. 예를 들어, 3 bits의 제1 비트는 최상위 자리이고, 마지막 비트가 가장 낮은 자리로 예를 들어, 3 bits를 010으로 표시하면 N₃’=7+2=9이다. 구현 (1)과 비교하여 구현 (2)의 제1 서브표시 정보는 1비트를 덜 차지하므로 시그널링의 오버헤드를 절약할 수 있다.In Table 6, the minimum value of N ₃ ' is

, and the maximum value of N ₃ 'is

am. In an embodiment of the present application, the first indication information is

It represents the value of N ₃ 'through bits. For example, the first bit of 3 bits is the most significant digit, and the last bit is the lowest digit. For example, if 3 bits are represented as 010, N ₃ '=7+2=9. Compared to implementation (1), the first subdisplay information of implementation (2) occupies 1 bit less, so signaling overhead can be saved.

In addition, the second sub-display information may also indicate a base vector used for each transport layer.

비트를 차지하며,

는 각 전송 계층에 사용되는 기본 벡터의 수이다. In one possible implementation, the second subdisplay information is

occupies a bit

is the number of base vectors used in each transport layer.

bits를 차지하여 전송 계층 1에 사용되는 기본 벡터 집합을 나타낸다. 제2 서브표시 정보를

bits를 차지하여 전송 계층 2에 사용되는 기본 벡터 집합을 나타낸다. 제2 서브표시 정보는

bits를 차지하여 전송 계층 3에 사용되는 기본 벡터 집합을 나타낸다.For example, the second sub-display information is

bits to represent the set of base vectors used for transport layer 1. second sub display information

bits to represent the set of base vectors used for transport layer 2. The second sub display information is

bits to represent the set of base vectors used for transport layer 3.

In one possible implementation, the second subdisplay information is one bitmap, and one bit of the bitmap corresponds to a position of a base vector used for each transport layer in a set of base vectors used for at least two transport layers.

For example, when RI=3, the second sub-display information is a base vector adopted for transport layer 0, transport layer 1, and transport layer 2 through the following three bitmaps. The base vector indications adopted for transport layer 0, transport layer 1 and transport layer 2 are shown in Table 7, Table 8 and Table 9, respectively.

transport layer 0 One One 0 One One One One 0 One

transport layer 1 One 0 One One 0 One One One One

transport layer 2 One 0 0 0 One One 0 0 One

For another example, the base station configures the underwater M value of the compressed base vector of each transport layer through higher layer signaling to the terminal device when the RI value is different according to Table 10.

RI transport layer M One 0 M0= M1=7 2 0 One 3 0 M0= M1=7 One 2 M2 =4 4 0 M0= M1=7 One 2 M2= M3=4 3

이고, 최대값

이다. 이때, 제1 서브표시 정보는

bits를 통해 N₃’의 값을 표시한다. 예를 들어, 3 bits의 제1 비트는 최상위 자리로, 3 비트 중 마지막 비트를 최하위 자리로 예를 들어 011로 표시하면 N₃’=2+3=5이다. The minimum value of N ₃ ' is

and the maximum value

am. At this time, the first sub display information is

A value of N ₃ 'is displayed through bits. For example, if the first bit of 3 bits is the most significant digit and the last bit of the 3 bits is the least significant digit, for example, 011, N ₃ '=2+3=5.

비트를 차지하여, 각 전송 계층 에 채택된 기본 벡터를 태타나고, 이는 여기서 반복되지 않는다. Similarly, in this case, the second subdisplay information is

bits, representing the base vector adopted for each transport layer, which is not repeated here.

As another example, when the RI value is different according to Table 11, the base station configures the M value of the number of compressed base vectors of each transport layer through higher layer signaling to the terminal device.

RI hierarchy M One 0 M ₀ =7 2 0 M ₀ =7 One M ₁ =7 3 0 M ₀ =7 One M ₁ =4 2 M ₂ =3 4 0 M ₀ =7 One M ₁ =3 2 M ₂ =2 3 M ₃ =2

이며 최대값

이다. 제1 서브표시 정보는

bits를 통해 N₃’의 값을 나타낼 수 있다. 예를 들어, 3 bits 중 제1 비트를 최상위 자리로, 마지막 비트를 최하위 자리로 예를 들어3 bits를 011로 표시하면N₃’=7+3=10. The minimum value of N ₃ ' is

and the maximum

am. The first sub display information is

A value of N ₃ ′ may be indicated through bits. For example, among 3 bits, the first bit is the most significant digit and the last bit is the least significant digit. For example, if 3 bits are indicated as 011, N ₃ '=7+3=10.

비트를 차지하여 전송 계층 에 채택된 기본 벡터를 나타낼 수 있으며, 이는 여기서 반복되지 않는다. Similarly, in this case, the second subdisplay information is

Bits can be occupied to indicate the base vector adopted in the transport layer, which is not repeated here.

개의 기본 벡터를 사용하도록 구성하는 경우, 여기서,

이며, 제1 서브표시 정보는

비트를 차지하여 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수를 나타낸다. (3) In the embodiments of the present application, the system predefined or the network device each of the at least two transport layers

If configured to use two basis vectors, where:

, and the first sub display information is

occupies bits to indicate the number of base vectors in the set of base vectors used in at least two transport layers.

For example, it is assumed that there are 13 subbands in the system, that is, the number of base vectors included in the candidate base vector set is 13, and when the RI values are different for terminal devices according to Table 12, each transport layer The number M of compressed base vectors is provided to the terminal device through higher layer signaling.

RI hierarchy M One 0 M ₀ =7 2 0 M ₀ =7 One M ₁ =7 3 0 M ₀ =7 One M ₁ =4 2 M ₂ =3 4 0 M ₀ =7 One M ₁ =3 2 M ₂ =2 3 M ₃ =2

이며 N₃’의 최대값은

이다. 시스템이 각 전송 계층가 고정적으로

개의 압축된 기본 벡터를 채택하도록 미리 정의하거나 구성하는 경우, 예를 들어, 후보 압축된 기본 벡터 중의 제1 및 제2 압축된 기본 벡터를 채택하도록 미리 정의하거나 구성하는 경우, 제1 표시 정보는

bits를 통해 N₃’의 값을 나타낼 수 있다. 예를 들어, 2비트의 첫번째 비트를 최상위 자리로 하고 마지막 비트를 가장 낮은 자리로 예를 들어2비트를 11로 표시하면 N₃’=7+3+2=11이다. From Table 12, the minimum value of N ₃ 'is

and the maximum of N ₃ ' is

am. In the system, each transport layer is statically

When predefined or configured to adopt two compressed base vectors, for example, when predefined or configured to adopt first and second compressed base vectors among candidate compressed base vectors, the first indication information is

A value of N ₃ ′ may be indicated through bits. For example, the first bit of 2 bits is the highest digit and the last bit is the lowest digit. For example, if 2 bits are expressed as 11, N ₃ '=7+3+2=11.

Compared to implementation (1), the first lower display information of implementation (3) occupies 2 bits less, so signaling overhead can be saved.

비트를 차지하여 전송 계층 에 채택된 기본 벡터를 나타낼 수 있으며, 이는 여기서 반복되지 않는다. Similarly, in this case, the second subdisplay information is

Bits can be occupied to indicate the base vector adopted in the transport layer, which is not repeated here.

비트를 차지하여 전송 계층 에 채택된 기본 벡터를 나타낼 때 단말 장치는 보고하지 않을 수 있거나, 단말 장치는 표시를 위해 1비트를 채택한다.In one possible implementation, when RI = 1, the second subdisplay information

When indicating the base vector adopted for the transport layer by occupying bits, the terminal device may not report, or the terminal device adopts 1 bit for indication.

For example, assuming that 13 subbands exist in the system, that is, the number of base vectors included in the candidate base vector set is 13, and the value of RI is different according to Table 13, higher layer signaling for the terminal device is performed. Through this, the number M of compressed base vectors of each transport layer is configured.

RI hierarchy M One 0 M ₀ =7 2 0 M ₀ =7 One M ₁ =7 3 0 M ₀ =7 One M ₁ =4 2 M ₂ =3 4 0 M ₀ =7 One M ₁ =3 2 M ₂ =2 3 M ₃ =2

When RI=1, according to the system predefined, the terminal device may not report the base vector adopted by each transport layer in the second part of the CSI. Alternatively, the second subindication information uses one bit value (eg, 0) to indicate the base vector adopted by transport layer 0. Alternatively, the second sub display information uses one bitmap as shown in Table 14 for display.

One One One One One One One

Case 3: For at least one beam corresponding to each of at least two transport layers mapped by a precoding matrix, different beams use different sets of base vectors, and base vector indication information is a first part of channel state information. It can be located in the second part of the channel state information, and can be located in the first part and the second part of the channel state information. In this case, for each transport layer, the terminal device may transmit a 2L compressed base vector to the network device. In a possible implementation, the number of base vectors in the base vector set corresponding to different beams is the same or different, the base vector indication information is located in the first part or the second part of the channel state information, and the base vector indication information is a bitmap. , and the length of the bitmap is 2L*N, where 2L is the number of beams and N is the number of candidate basis vector sets. One preset bit corresponds to the position of the compressed base vector corresponding to the transport layer in the set of candidate base vectors.

In a possible implementation, the number of base vectors in the base vector set corresponding to the different beams is the same or different, the base vector indication information includes first sub-display information and second sub-display information, and the first sub-display information includes a channel It may be included in the first part of the state information, and the second sub-display information may be included in the second part of the channel state information. The first sub-display information indicates the number K of base vectors in the absolute base vector set, and the second sub-display information indicates K base vectors of the absolute base vector set.

For example, for each transport layer, the basic vector display information is a bitmap, and the length of the bitmap is 2L*K. Here, each bit corresponds to one basis vector in the set of absolute basis vectors. For example, the number of base vectors in the candidate base vector set is N = 13, the number of beams is L = 2, and the first subdisplay information indicates that the number of base vectors in the absolute base vector set is K = 5; The second sub-display information indicates that the absolute base vector set is {0,2,4,5,7}, and the second sub-display information indicates the first relative set of base vectors by adopting the bitmap shown in Table 15.

One 0 One One One 0 One 0 0 One One One 0 0 0 0 One One 0 0

In Table 15, the first row represents a set of base vectors corresponding to the first beam of transmission layer I, that is, a first relative set of base vectors. The bitmap of the first row is 10111 and the first relative base vector set corresponding to the absolute base vector set {0,2,4,5,7} is {0, 4, 5, 7}. Similarly, the second row indicates that the relative set of base vectors corresponding to the second beam of transport layer I is {2, 7} and so on. It can be inferred like this. Similarly, the second subdisplay information adopts a bitmap as shown in Table 16 to indicate the second relative set of base vectors.

One One One 0 0 0 One One 0 One One 0 0 One 0 One 0 0 0 One

In Table 16, the first row represents a set of base vectors corresponding to the first beam of transport layer II, that is, a first relative base vector set. The bitmap of the first row is 11100 and the first relative base vector set corresponding to the absolute base vector set {0,2,4,5,7} is {0,2,4}. Similarly, the second row indicates that the second set of relative base vectors corresponding to the second beam of transport layer II is {2,4,7}.

In a possible implementation, the base vector indication information includes first sub-display information and second sub-display information, the first sub-display information may be included in the first part of the channel state information, and the second sub-display information is the channel state information. It may be included in the second part of the information. The first sub-display information indicates the number of base vectors in the base vector set used in each of at least two transport layers, and the second sub-display information indicates a base vector set corresponding to each beam of each transport layer.

For example, for each transport layer, the second sub-display information includes one base vector set display information and one bitmap. For example, the number of base vectors in the candidate base vector set is N=13, the number of beams is L=2, and the first sub-display information is the number of base vectors in the base vector set used for transport layer I K1= 5, indicates that the number of base vectors in the base vector set used in transport layer II is K2 = 3. The second sub-display information indicates that the base vector set used for transport layer I is {0,2,4,5,7} and the base vector set for transport layer II is {3,7,10}. The second sub-display information includes a 2L*K1 bitmap as shown in Table 17 and indicates a base vector set of transport layer I.

One 0 One One One 0 One 0 0 One One One 0 0 0 0 One One 0 0

In Table 17, the first row indicates that the set of base vectors corresponding to the first beam of transport layer I is the base vector {0, 4, 5, 7}, and the second row corresponds to the second beam of transport layer I. indicates that the set of basis vectors that

The second subdisplay information further includes 2L*K1 bitmaps as shown in Table 18 to indicate the base vector set of the transport layer II.

One One One 0 One One One 0 One One One 0

In Table 18, the first row indicates that the base vector set corresponding to the first beam of transport layer II is the base vector {3,7,10}. The second row indicates that the base vector set corresponding to the second beam of transport layer II is the base vector {7,10}. It can be inferred like this.

In a possible implementation, the base vector indication information includes first sub-display information and second sub-display information, the first sub-display information may be included in the first part of the channel state information, and the second sub-display information is the channel state information. It may be included in the second part of the information. The first subdisplay information indicates the number of base vector sets corresponding to each beam corresponding to each of at least two transport layers. The second sub-display information indicates a base vector set corresponding to each beam of each transport layer.

For example, the number of base vectors in the candidate base vector set is N=13, and the number of beams L=2. In the first sub-display information, the number of base vectors in the base vector set corresponding to each of 2L = 4 beams of transport layer I is {2,4,3,2}, and the number of base vectors corresponding to each of 2L = 4 beams of transport layer II Indicates that the number of basis vectors in the set of basis vectors to be {2,2,2,3}. In the second sub-display information, base vector sets corresponding to each of the four beams of transport layer I are {0,1}, {1,3,4,5}, {0,5,7}, {2,8, 11}, and base vector sets corresponding to each of the four beams of transport layer II are {2,3}, {9,10}, {8,11}, and {6,9,11}. Taking the second beam of transport layer II as an example, the first sub-display information indicates that the number of base vectors in the base vector set corresponding to this beam is 2. The second sub-display information represents a base vector {9,10} among candidate base vectors, which is a set of base vectors corresponding to the next beam. Other beams can be inferred like this.

In an embodiment of the present application, the terminal device may transmit base vector indication information to the network device according to any one of the first to third cases to inform the network device to obtain the compressed base vector of the precoding matrix. The network device and the terminal device may designate the coefficients of the precoding matrix obtained in advance, or the system may predefine the coefficients of the precoding matrix. For example, the predefined configuration information may indicate coefficients of a precoding matrix. At this time, the terminal device may not transmit the coefficients of the precoding matrix to the network device, and the network device knows the coefficients of the precoding matrix as a default. For example, a network device and a terminal device designate coefficients of a precoding matrix in advance.

If the network device cannot obtain the coefficients to be weighted, for example, of the precoding matrix, the system does not predefine coefficients of the precoding matrix and the number of used coefficients is less than a first preset value, the first The preset value is, for example, a product of the number of at least one beam and the number of base vectors among compressed base vectors. For example, including 2L beams, and the compressed base vector includes M base vectors, if the first preset value is 2L*M and the number of coefficients K0 used is less than 2L*M, the network device Coefficients of the precoding matrix to be compressed may not be obtainable.

Taking this into account, in the embodiments of the present application, the terminal device may also inform the network device of the coefficients of the precoding matrix. For example, the channel state information transmitted by the terminal device to the network device also includes zero coefficient indication information to indicate a coefficient used as 0 in all coefficients corresponding to all subbands. For another example, the channel state information transmitted by the terminal device to the network device may also include non-zero coefficient indication information indicating coefficients used as non-zero values in all coefficients corresponding to all subbands.

According to the case where the precoding matrix uses the same or different set of base vectors for mapping at least two transport layers and the case where multiple beams use the same or different set of base vectors, zero coefficient indication information or non-zero coefficient indication The information may also differ, which is specifically introduced below.

If 2L beams of each of the two transport layers mapped by the precoding matrix use the same base vector set, the terminal device also transmits K0<2L*M base vectors to the network device for each transport layer to perform precoding. We can form the compressed base vector of the matrix. In this case, both coefficients and base vector display information corresponding to each transport layer must be transmitted to the network device. Transmitting the basic vector display information to the network device may be the same as the transmission method provided from the first case to the third case, and may specifically refer to the transmission method provided from the first case to the third case. This will not be repeated here.

In a possible implementation, the coefficients of the precoding matrix may be a coefficient matrix containing 2L*M coefficients, and the zero coefficient indication information may be used to indicate the position of the zero coefficient in the coefficient matrix, thus corresponding to the position of the coefficient matrix. coefficient is a zero coefficient. Alternatively, the non-zero coefficient indication information may be used to indicate a position of a non-zero coefficient in the coefficient matrix, and thus a coefficient corresponding to a position in the coefficient matrix becomes a non-zero coefficient. The coefficient matrix may be predefined by the system or transmitted by the terminal device to the network device. Zero coefficient indication information or non-zero coefficient indication information may be implemented in the following manner.

In a possible implementation, the zero coefficient indication information is used to indicate at least one of a row position and a column position of a zero coefficient in a coefficient matrix, for example, the zero coefficient indication information is an index of each zero coefficient in a preset coefficient matrix. . Its size is (2L*M-K0)*log2(2L*M) bits. Also, the zero coefficient display information may be a bitmap, and one preset bit in the bitmap is a column position of a corresponding zero coefficient in a row indicated by an index or a row position of a corresponding zero coefficient in a column. For example, the zero coefficient indication information is 2L*M bits, and the bit whose value is 1 is used to indicate the position of the zero coefficient in the row or column indicated by the index, that is, the exact position in the preset coefficient matrix. .

In a possible implementation, the system may predefine a set of zero coefficients for a beam, which is referred to as a set of zero coefficient beams for ease of explanation. The zero coefficient beam set corresponds to coefficients represented by rows of a preset coefficient matrix, and the zero coefficient base vector set corresponds to coefficients represented by columns in the preset coefficient matrix. For example, the following preset coefficient matrix is all coefficients corresponding to a 2L beam.

The zero-coefficient beam set is a coefficient set represented by a row dashed line, and the zero-coefficient basis vector set is a coefficient set represented by a column dashed line. Of course, the zero coefficient beam set and the zero coefficient base vector set may also be transmitted by the terminal device to the network device, which is not limited in the embodiments of the present application.

Similarly, the system may predefine a set of nonzero coefficients for a beam, and for ease of explanation, the set of nonzero coefficients for a beam is referred to as a set of nonzero coefficients beam. The system may also predefine a set of non-zero coefficients for the basis vectors, which is referred to as a set of non-zero coefficients basis vectors for ease of explanation. The set of non-zero coefficient beams corresponds to coefficients represented by rows in the preset coefficient matrix, and the set of non-zero coefficient base vectors corresponds to coefficients represented by columns in the preset coefficient matrix. Similar to the zero coefficient beam set, taking the above zero coefficient beam set as an example, the non-zero coefficient beam set is the coefficient set other than the row dashed line mark, and the nonzero coefficient basis vector set is the coefficient set other than the column dashed line mark. . Of course, the non-zero coefficient beam set and the non-zero coefficient base vector set may also be transmitted by the terminal device to the network device, which are not limited in the embodiments of the present application.

The system predefines a zero coefficient beam set and a zero coefficient base vector set, and the zero coefficient indication information may indicate a position of a zero coefficient in the zero coefficient base vector set in the zero coefficient beam set, that is, a zero coefficient in the coefficient matrix. You can indicate row position and column position. In a possible implementation, the zero coefficient indication information is the index of the zero coefficient in the zero coefficient beam set and the zero coefficient base vector set. For example, the zero coefficient display information includes the zero coefficient index {1, M-1} in the zero coefficient base vector set and the zero coefficient index {1} in the zero coefficient beam set, and is represented by the zero coefficient display information. The zero coefficient is a coefficient within the broken line region in the following equation.

In the broken line region, the position of the zero coefficient, that is, the position of 4L+M-2 is indicated. Of course, the zero coefficient indication information may include a bitmap indicating that the coefficient at the corresponding position in the broken line area is a zero coefficient, that is, 4L+M-2 bits.

Similarly, in a possible implementation, the non-zero coefficient indication information includes the second bitmap and the third bitmap. The second bitmap is used to indicate the non-zero coefficient beam set and the non-zero coefficient base vector set, and includes 2L+M bits. M bits are used to denote the set of non-zero coefficient basis vectors, and the basis vector indices {0, 2, 3, ... , M-2} is set to 1. The 2L bits are used to indicate the non-zero coefficient beamset. Beam index {0，2，3，... , 2L-1} is set to 1. In this case, the non-zero coefficient range indicated by the non-zero coefficient display information is a coefficient outside the broken line region in the following equation.

Further, the third bitmap is used to indicate at least one of a column position of a non-zero coefficient in a row and a row position of a non-zero coefficient in a column indicated by the second bitmap. For example, the third bitmap uses 2LM-(4L+M-2) bits to indicate that a coefficient at a corresponding position outside the broken line area is a non-zero coefficient.

In a possible implementation, some of the coefficients of the plurality of rows of the coefficient matrix are predefined for use. For example, according to the strong-weak relationship of beams, the system predefines a zero-coefficient beam set as a zero-coefficient beam set corresponding to the last L0 beam. The terminal device may not transmit this zero-coefficient beam set to the network device. The zero coefficient display information is used to display zero coefficients in a zero coefficient beam set corresponding to L0 beams. For example, the zero coefficient display information may be an L0*M bitmap. For example, assuming that the weakest L0=2 beams are beam 1 and beam 2L-1, the following equation is obtained. The zero coefficient indication information may include 2M bits to indicate the position of a zero coefficient, that is, a coefficient included in a broken line in the following equation.

In a possible implementation, the system predefines that the coefficient at the intersection of the zero coefficient beam set and the zero coefficient base vector set is a zero coefficient. For better understanding, refer to the following equation.

및

이고,

및

는 제로 계수이다. 이때, 제로 계수 표시 정보는 제로 계수 빔 집합과 제로 계수가 위치한 제로 계수 기본 벡터 집합을 나타내기 위해 사용된다. 또한 위의 수학식에서 제로 계수 빔 집합과 제로 계수 기본 벡터 집합은 파선으로 표시된다.In the above equation, the zero coefficient beam set is a zero coefficient beam set corresponding to beam 1, and the zero coefficient base vector set is a zero coefficient base vector set corresponding to base vector 1 and base vector M-1. The coefficient at the intersection of the zero-coefficient beam set and the zero-coefficient basis vector set is

and

ego,

and

is the zero coefficient. At this time, the zero coefficient display information is used to indicate a zero coefficient beam set and a zero coefficient base vector set in which the zero coefficients are located. Also, in the above equation, the zero-coefficient beam set and the zero-coefficient base vector set are indicated by broken lines.

In a possible implementation, the system predefines that the coefficient at the intersection of the zero coefficient beam set and the zero coefficient base vector set is a zero coefficient. At the same time, according to the strength-weakness relationship of the beams, the system predefines a set of zero-coefficient beams corresponding to the last L0 beams. Currently, the terminal device may not send this zero-coefficient beam set to the network device.

In a possible implementation, the system predefines that the coefficient at the intersection of the zero coefficient beam set and the zero coefficient base vector set is a zero coefficient. At the same time, according to the strong-weak relationship of basis vectors, the system predefines a set of zero-coefficient basis vectors corresponding to the last S0 basis vectors. Currently, the terminal device may not transmit this zero-coefficient basis vector set to the network device.

In the embodiment of the present application, in step S102, the channel state information sent by the terminal device as designated may further include at least one wideband amplitude coefficient, and for ease of explanation, at least one wideband amplitude coefficient or less. In , referred to as a group of wideband amplitude coefficients, one wideband amplitude coefficient of the group of wideband amplitude coefficients corresponds to one compressed base vector of the codebook.

는 식 (4)에 표시된 정량화 방식을 나타낼 수 있다.Continuing to refer to the codebook represented by equation (1), the coefficient matrix of equation (1) can adopt various quantification schemes, and one possible quantification scheme

can represent the quantification scheme shown in equation (4).

（4）

(4)

의 대각 요소로 구성된 집합, 즉,

는 코드북의 광대역 진폭 계수 집합이라고 하거나 광대역 진폭 계수의 집합으로 사용할 수 있으며, 하나의 압축된 기본 벡터 i（i=0,1,…，M-1）는 광대역 진폭 계수의 그룹의 하나의 광대역 진폭 계수

에 대응한다. 하나의 압축된 기본 벡터 i（i=0,1,…，M-1）는

와 같은 위상 계수의 하나의 그룹에 대응할 수도 있다.Matrix in Equation 4

The set of diagonal elements of , that is,

is called the wideband amplitude coefficient set of the codebook or can be used as a set of wideband amplitude coefficients, and is composed of one compressed base vector i (i=0,1,…). ，M-1） is one broadband amplitude coefficient of a group of broadband amplitude coefficients

respond to One compressed basis vector i（i=0,1,… ，M-1）is

may correspond to one group of phase coefficients such as

In a possible implementation, the channel state information transmitted by the terminal device to the network device may further include at least one differential amplitude coefficient, and for ease of explanation, the at least one differential amplitude coefficient is One differential amplitude coefficient of the group corresponds to a differential coefficient of one wideband amplitude coefficient of the group of the above broadband amplitude coefficients.

이고, 하나의 차등 진폭 계수

는 하나의 광대역 진폭 계수

의 차등 계수에 대응한다.Continuing to refer to Equation (4), where the group of differential amplitude coefficients is

, and one differential amplitude coefficient

is one broadband amplitude coefficient

corresponds to the differential coefficient of

In summary, in the embodiments of the present application, the channel state information transmitted by the terminal device to the network device includes base vector indication information to indicate the compressed base vector adopted for the coefficients of the terminal device compression precoding matrix, and thus The network device determines all precoding matrices used in the b-band according to the compressed base vector, the orthogonal beams of the precoding matrix, and the coefficients of the precoding matrix, and the coefficients of the precoding matrix and the channel status reported by the terminal device are determined. Parse the received channel state information to determine

Devices provided by the embodiments of the present application are introduced below together with accompanying drawings in the specification.

Referring to FIG. 2 , based on the same concept of the present invention, an embodiment of the present application further provides a terminal device. The terminal device includes a memory 201, a processor 202 and a transceiver 203. The memory 201 and the transceiver 203 may be connected to the processor 202 through a bus interface (Fig. 2 illustrates this), or may be connected to the processor 202 through a special connection line. The transceiver 203 is used to transmit information under the control of the processor 202. Memory 201 may be configured to store programs. The processor 202 can be used to read the program in the memory 201 and execute the next process.

The processor 202 determines a compressed base vector from a precoding matrix, the compressed base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is configure frequency domain characteristics of;

Send channel state information to a network device, where the channel state information includes base vector indication information, and the base vector indication information is used to indicate a compressed base vector.

Optionally, the processor 202 defines the compressed base vector in the precoding matrix according to configuration information from a network device or predefined configuration information; Here, the configuration definition is used to indicate at least one of the number of compressed base vectors, the number of subbands corresponding to the channel state information, and the beams corresponding to each transport layer mapped by the precoding matrix.

Optionally, the base vector indication information is a first bitmap, and 1 bit of the first bitmap corresponds to a position of one base vector of compressed base vectors in the set of candidate base vectors. Alternatively, the base vector indication information is an index of each base vector in a set of candidate base vectors included in the compressed base vector.

Optionally, the basic vector indication information is located in at least one of the first part or the second part of the channel state information.

Optionally, if at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set and the at least two transport layers use the same compressed base vector, base vector indication information is located in the first part of the channel state information; Alternatively, at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set and uses a compressed base vector consulted by the transport layer consulted among the at least two transport layers. In this case, the basic vector indication information is located in the second part of the channel state information, or the basic vector indication information is located in the first part and the second part of the channel state information; For at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information is a first part or a second part of the channel state information. located in at least one of

Optionally, at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layers consulted by the at least two transport layers use the negotiated compressed base vector. and the base vector display information includes first sub-display information and second sub-display information, the first sub-display information is included in the first part, and the second sub-display information is included in the second part, wherein:

The first sub-display information is used to indicate a compressed base vector corresponding to a part of at least two transport layers, and the second sub-display information is a compressed base vector corresponding to the rest of the transport layers other than some of the at least two transport layers. used to indicate a base vector; or, the first sub-display information indicates a set of base vectors used in at least two transport layers. The second sub-display information indicates a base vector set used in each of at least two transport layers. Alternatively, the first subdisplay information indicates the number of base vectors in a base vector set used for at least two transport layers. The second sub-display information indicates a base vector set used in at least two transport layers and a base vector set used in each of the at least two transport layers. Alternatively, the first sub-display information may indicate a set of base vectors used in at least two transport layers. Indicates the number of basis vectors in the set of basis vectors. The second sub-display information indicates a base vector set used in each of at least two transport layers.

Optionally, the first sub-display information indicates the number of base vectors in the set of base vectors used in the at least two transport layers and the second sub-display information indicates a set of base vectors used in each of the at least two transport layers. If indicated, a base vector in the base vector set used for each of the at least two transport layers is selected from the candidate base vector set. A base vector included in the candidate base vector set is predefined by the system and determined according to the first sub-display information.

Optionally, when the first subindication information is used to indicate the number of base vectors in a set of base vectors used in the at least two transport layers,

비트를 차지하고, 여기서, N₃은 상기 후보 기본 벡터 집합 내의 기본 벡터의 수이고; 또는 상기 제1 서브표시 정보는

비트를 차지하고, 여기서,

는 상기 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 합이고,

는 상기 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 최대값이다. The first sub display information is

bits, where N ₃ is the number of base vectors in the set of candidate base vectors; or the first sub display information

occupy a bit, where

Is the sum of the number of base vectors used in each of the at least two transport layers,

is the maximum value of the number of base vectors used in each of the at least two transport layers.

개의 기본 벡터를 사용하도록 구성하는 경우, 상기

， 상기 제1 서브표시 정보는

비트를 차지한다. Optionally, each of the at least two transport layers is predefined by the system or the network device

When configured to use two basis vectors, the above

, the first sub-display information

take up bits

비트를 차지한다. 상기 하나의비트맵의 1 비트는 상기 후보 기본 벡터 집합에서 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합의 위치에 대응하고,

는 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수이고; 상기 제4 부분는 각 전송 계층에 사용되는 기본 벡터를 표시하고, 상기 제2 서브표시 정보는 또 다른 비트맵이거나, 또는 상기 제4 부분는

비트를 차지하고, 상기 다른 하나의 비트맵의 1 비트는 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합에서 각 전송 계층에 사용되는 기본 벡터의 위치에 대응하고,

는 각 전송 계층에 사용되는 기본 벡터의 수이다. Optionally, the second subdisplay information includes a third part and a fourth part. The third part is used to indicate a base vector set used in at least two transport layers, and the third part is a bitmap or

take up bits 1 bit of the one bitmap corresponds to positions of base vector sets used in the at least two transport layers in the candidate base vector set;

is the number of base vectors in the base vector set used in the at least two transport layers; The fourth part indicates a base vector used for each transport layer, and the second sub-display information is another bitmap, or the fourth part

bit, and 1 bit of the other bitmap corresponds to a position of a base vector used for each transport layer in a set of base vectors used for the at least two transport layers,

is the number of base vectors used in each transport layer.

비트를 차지하여 각 전송 계층에 사용되는 기본 벡터를 표시하고, 전송 계층가 하나인 경우 상기 제4 부분는 1 비트로 각 전송 계층에 사용되는 기본 벡터를 표시하고, 또는 시스템은 단말이 각 전송 계층에 사용되는 기본 벡터를 보고하지 않도록 미리 정의한다. Optionally, the fourth part

occupies a bit to indicate the base vector used for each transport layer, and if there is one transport layer, the fourth part indicates the base vector used for each transport layer with 1 bit, or the system indicates that the terminal is used for each transport layer Predefine not to report the base vector.

Optionally, for at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information is a first part of channel state information or Located in the second part, the base vector display information is a bitmap, and the length of the bitmap is 2L*N, where 2L is the number of beams and N is the number of candidate base vector sets. One preset bit corresponds to the position of the compressed base vector corresponding to the transport layer in the set of candidate base vectors.

Optionally, for at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information includes first subdisplay information and second subdisplay information. sub-display information, wherein the first sub-display information is included in the first portion, and the second sub-display information is included in the second portion, wherein the first sub-display information is included in at least two displaying K base vectors of each of the at least two transport layers in the set of base vectors used for the transport layers; Alternatively, the first sub-display information indicates the number of base vector sets used in each of the at least two transport layers, and the second sub-display information indicates a base vector set corresponding to a beam of each of the at least two transport layers; Alternatively, the first sub-display information indicates the number of base vectors in the base vector set corresponding to each beam corresponding to each of the at least two transport layers, and the second sub-display information corresponds to each beam of the at least two transport layers. represents the set of basis vectors that

Optionally, the processor 202 determines the compressed base vector according to configuration information from a network device, and at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix has the same base vector. When a vector set is used and the number of coefficients used in each transport layer is less than a first preset value, the channel state information also includes zero coefficient indication information or non-zero coefficient indication information; Here, the zero coefficient indication information indicates a zero coefficient used in each of the at least two transport layers, and the zero coefficient is a coefficient used as 0 in a plurality of coefficients of the precoding matrix; The non-zero coefficient indication information indicates a non-zero coefficient used in each of at least two transport layers, and the non-zero coefficient is a coefficient used as a non-zero value among a plurality of coefficients of the precoding matrix.

Optionally, the first preset value is a product of the number of at least one beam and the number of base vectors among the compressed base vectors.

Optionally, the plurality of coefficients is a preset coefficient matrix, the zero coefficient indication information indicates the position of the zero coefficient in the coefficient matrix, or the non-zero coefficient indication information indicates the position of the nonzero coefficient in the coefficient matrix.

Optionally, the zero coefficient indication information includes an index of a zero coefficient in the coefficient matrix, and the index is used to indicate a row position or a column position of the zero coefficient in the coefficient matrix; or, the non-zero coefficient indication information includes a second bitmap and a third bitmap; wherein the second bitmap indicates the row positions or column positions of all nonzero coefficients in the coefficient matrix, and the third bitmap indicates the column positions of nonzero coefficients in a row or the nonzero row in a column indicated by the second bitmap. indicate the location

Optionally, the zero coefficient indication information further includes a fourth bitmap, wherein 1 bit of the fourth bitmap corresponds to at least one of a column position of a row and a row position of a column indicated by an index of one zero coefficient.

Optionally, a coefficient at an intersection of a column coefficient and a row coefficient in the coefficient matrix is a zero coefficient, and the zero coefficient display information is used to indicate the row coefficient and column coefficient at which the zero coefficient is located.

Optionally, the precoding matrix predefines to use some of the row coefficients in a plurality of row coefficients of the coefficient matrix, and the zero coefficient indication information is used to indicate zero coefficients of some of the row coefficients in the coefficient matrix.

Optionally, the channel state information further includes at least one wideband amplitude coefficient; Here, one wideband amplitude coefficient corresponds to one compressed base vector of the codebook.

Optionally, the channel state information further includes at least one differential amplitude coefficient; Here, one differential amplitude coefficient corresponds to a differential coefficient of one wideband amplitude coefficient.

Here, in FIG. 2, an arbitrary number of interconnected buses and bridges may be included, and specifically, one or a plurality of processors including the processor 202 and various types of memory circuits including the memory 201 Connected. A bus architecture can connect many different circuits together, such as peripherals, current breakers and power management circuits. This is a well-known matter in the field of the present invention and will not be described further. A bus interface provides an interface. The transceiver 203 may be a plurality of elements, ie, including transmitters and receivers, providing elements that communicate with various other devices in a transmission medium. The processor 202 is responsible for managing the bus architecture and general processing, and the memory 201 may store data used when the processor 202 operates.

Referring to FIG. 3 , based on the spirit of the same invention, an embodiment of the present application provides a terminal device. The terminal device includes a determining unit 301 and a sending unit 302. Here, the determining unit determines a compressed base vector in the precoding matrix, the compressed base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is configure frequency domain characteristics of; The transmission unit transmits the channel state information to the network device, where the channel state information includes base vector indication information, and the base vector indication information is used to indicate the compressed base vector.

Optionally, the determining unit 301 determines a base vector compressed in the precoding matrix according to configuration information from a network device or predefined configuration information; Here, the configuration information indicates at least one of the number of compressed base vectors, the number of subbands corresponding to the channel state information, and the number of beams corresponding to each transport layer mapped by the precoding matrix.

Optionally, the base vector indication information is a first bitmap, and 1 bit of the first bitmap corresponds to a position of one base vector among compressed base vectors in the set of candidate base vectors; Alternatively, the base vector indication information is an index of each base vector in a set of candidate base vectors included in the compressed base vector.

Optionally, the basic vector indication information is located in at least one of the first part or the second part of the channel state information.

Optionally, if at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set and the at least two transport layers use the same compressed base vector, base vector indication information is located in the first part of the channel state information; Alternatively, at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set and uses a compressed base vector consulted by the transport layer consulted among the at least two transport layers. In this case, the basic vector indication information is located in the second part of the channel state information, or the basic vector indication information is located in the first part and the second part of the channel state information; For at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information is a first part or a second part of the channel state information. located in at least one of

Optionally, at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layers consulted by the at least two transport layers use the negotiated compressed base vector. and the base vector display information includes first sub-display information and second sub-display information, the first sub-display information is included in the first part, and the second sub-display information is included in the second part, wherein: The first sub-display information is used to indicate a compressed base vector corresponding to a part of at least two transport layers, and the second sub-display information is a compressed base vector corresponding to the rest of the transport layers other than some of the at least two transport layers. used to indicate a base vector; or, the first sub-display information indicates a set of base vectors used in at least two transport layers. The second sub-display information indicates a base vector set used in each of at least two transport layers. Alternatively, the first subdisplay information indicates the number of base vectors in a base vector set used for at least two transport layers. The second sub-display information indicates a base vector set used in at least two transport layers and a base vector set used in each of the at least two transport layers. Alternatively, the first sub-display information may indicate a set of base vectors used in at least two transport layers. Indicates the number of basis vectors in the set of basis vectors. The second sub-display information indicates a base vector set used in each of at least two transport layers.

Optionally, the first sub-display information indicates the number of base vectors in the set of base vectors used in the at least two transport layers and the second sub-display information indicates a set of base vectors used in each of the at least two transport layers. If indicated, a base vector in the base vector set used for each of the at least two transport layers is selected from the candidate base vector set. A base vector included in the candidate base vector set is predefined by the system and determined according to the first sub-display information.

비트를 차지하고, 여기서, N₃은 상기 후보 기본 벡터 집합 내의 기본 벡터의 수이고; 또는 상기 제1 서브표시 정보는

비트를 차지하고, 여기서,

는 상기 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 합이고,

는 상기 적어도 두 개의 전송 계층 각각에 사용되는 기본 벡터의 수의 최대값이다. Optionally, when the first sub-display information is used to indicate the number of base vectors in a set of base vectors used in the at least two transport layers, the first sub-display information

bits, where N ₃ is the number of base vectors in the set of candidate base vectors; or the first sub display information

occupy a bit, where

Is the sum of the number of base vectors used in each of the at least two transport layers,

is the maximum value of the number of base vectors used in each of the at least two transport layers.

개의 기본 벡터을 구성하는 경우, 상기

， 상기 제1 서브표시 정보는

비트를 차지한다. Optionally, a system predefined or network device is used for each of the at least two transport layers.

In the case of constructing two basis vectors, the

, the first sub-display information

take up bits

비트를 차지하고, 상기 하나의 비트맵의 1 비트는 상기 후보 기본 벡터 집합에서 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합의 위치에 대응하고,

는 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합 내의 기본 벡터의 수이고; 상기 제4 부분는 각 전송 계층에 사용되는 기본 벡터를 표시하고, 상기 제2 서브표시 정보는 또 다른 비트맵이거나, 또는 상기 제4 부분은

비트를 차지하고, 상기 다른 하나의 비트맵의 1 비트는 상기 적어도 두 개의 전송 계층에 사용되는 기본 벡터 집합에서 각 전송 계층에 사용되는 기본 벡터의 위치에 대응하고,

는 각 전송 계층에 사용되는 기본 벡터의 수이다. Optionally, the second subdisplay information includes a third part and a fourth part; Here, the third part indicates a base vector set used in the at least two transport layers, and the third part is one bitmap, or the third part is

bits, and 1 bit of the one bitmap corresponds to positions of base vector sets used in the at least two transport layers in the candidate base vector set;

is the number of base vectors in the base vector set used in the at least two transport layers; The fourth part indicates a base vector used for each transport layer, and the second sub-display information is another bitmap, or the fourth part

bit, and 1 bit of the other bitmap corresponds to a position of a base vector used for each transport layer in a set of base vectors used for the at least two transport layers,

is the number of base vectors used in each transport layer.

비트를 차지하여 각 전송 계층에 사용되는 기본 벡터를 표시하고, 전송 계층가 하나인 경우 상기 제4 부분은 1 비트로 각 전송 계층에 사용되는 기본 벡터를 표시하고, 또는 시스템은 단말이 각 전송 계층에 사용되는 기본 벡터를 보고하지 않도록 미리 정의한다. Optionally, the fourth part

occupies a bit to indicate the base vector used for each transport layer, and if there is one transport layer, the fourth part indicates the base vector used for each transport layer with 1 bit, or the system indicates the base vector used for each transport layer by the terminal It is predefined not to report the base vector that is used.

Optionally, for at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information is a first part of channel state information or Located in the second part, the base vector display information is a bitmap, and the length of the bitmap is 2L*N, where 2L is the number of beams and N is the number of candidate base vector sets. One preset bit corresponds to the position of the compressed base vector corresponding to the transport layer in the set of candidate base vectors.

Optionally, for at least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix, different beams use different sets of base vectors and the base vector indication information includes first subdisplay information and second subdisplay information. sub-display information, wherein the first sub-display information is included in the first portion, and the second sub-display information is included in the second portion, wherein the first sub-display information is included in at least two displaying K base vectors of each of the at least two transport layers in the set of base vectors used for the transport layers; Alternatively, the first sub-display information indicates the number of base vector sets used in each of the at least two transport layers, and the second sub-display information indicates a base vector set corresponding to a beam of each of the at least two transport layers; Alternatively, the first sub-display information indicates the number of base vectors in the base vector set corresponding to each beam corresponding to each of the at least two transport layers, and the second sub-display information corresponds to each beam of the at least two transport layers. represents the set of basis vectors that

Optionally, the determining unit 301 determines the compressed base vector according to configuration information from the network device, and at least one beam corresponding to each of the at least two transmission layers mapped by the precoding matrix has the same base vector. When aggregation is used and the number of coefficients used in each transmission layer is smaller than the first preset value, the channel state information also includes zero coefficient indication information or non-zero coefficient indication information; Here, the zero coefficient indication information indicates a zero coefficient used in each of the at least two transport layers, and the zero coefficient is a coefficient used as 0 in a plurality of coefficients of the precoding matrix; The non-zero coefficient indication information indicates a non-zero coefficient used in each of at least two transport layers, and the non-zero coefficient is a coefficient used as a non-zero value among a plurality of coefficients of the precoding matrix.

Optionally, the first preset value is a product of the number of at least one beam and the number of base vectors among the compressed base vectors.

Optionally, the plurality of coefficients is a preset coefficient matrix, the zero coefficient indication information indicates the position of the zero coefficient in the coefficient matrix, or the non-zero coefficient indication information indicates the position of the nonzero coefficient in the coefficient matrix.

Optionally, the zero coefficient indication information includes an index of a zero coefficient in the coefficient matrix, and the index is used to indicate a row position or a column position of the zero coefficient in the coefficient matrix; or, the non-zero coefficient indication information includes a second bitmap and a third bitmap; wherein the second bitmap indicates the row positions or column positions of all nonzero coefficients in the coefficient matrix, and the third bitmap indicates the column positions of nonzero coefficients in a row or the nonzero row in a column indicated by the second bitmap. indicate the location

Optionally, the zero coefficient indication information further includes a fourth bitmap, wherein 1 bit of the fourth bitmap corresponds to at least one of a column position of a row and a row position of a column indicated by an index of one zero coefficient.

Optionally, a coefficient at an intersection of a column coefficient and a row coefficient in the coefficient matrix is a zero coefficient, and the zero coefficient display information is used to indicate the row coefficient and column coefficient at which the zero coefficient is located.

Optionally, the precoding matrix predefines to use some of the row coefficients in a plurality of row coefficients of the coefficient matrix, and the zero coefficient indication information is used to indicate zero coefficients of some of the row coefficients in the coefficient matrix.

Optionally, the channel state information further includes at least one wideband amplitude coefficient; Here, one wideband amplitude coefficient corresponds to one compressed base vector of the codebook.

Optionally, the channel state information further includes at least one differential amplitude coefficient; Here, one differential amplitude coefficient corresponds to a differential coefficient of one wideband amplitude coefficient.

The entity device of the determining unit 301 and transmitting unit 302 of the terminal device may correspond to the processor 202 or transceiver 203 of FIG. 2 . The terminal device can be used to execute the method provided by the embodiment shown in FIG. 1 . Therefore, functions that can be implemented by all functional modules of the device may refer to the description of the embodiment shown in FIG. 1 . Repeated explanations are omitted here.

Referring to FIG. 4 , based on the same inventive concept, an embodiment of the present application further provides a network device. The network device includes a memory 401, a processor 402 and a transceiver 403. The memory 401 and the transceiver 403 can be connected to the processor 402 through a bus interface (Fig. 4 takes this as an example), or can also be connected to the processor 402 through a special connection line. Transceiver 403 transmits information under the control of processor 402 .

Memory 401 may be configured to store programs. Processor 402 may be used to read programs in memory 401 to execute subsequent processes.

The processor 402 receives channel state information from a terminal device, wherein the channel state information includes base vector indication information, and the base vector indication information is used to indicate base vectors compressed in a precoding matrix; The compressed base vector belongs to a set of candidate base vectors, where the compressed base vector weighted by coefficients of the precoding matrix constitutes a frequency domain characteristic of the precoding matrix;

Channel state information is parsed according to the compressed base vector.

Optionally, the processor 402 also transmits configuration information to the terminal device, where the configuration information is mapped by the number of compressed base vectors, the number of subbands corresponding to the channel state information, and the precoding matrix. Indicates at least one of the number of beams corresponding to each transport layer.

Optionally, the channel state information also includes zero coefficient indication information or non-zero coefficient indication information; Here, the zero coefficient indication information indicates a zero coefficient used in each of the at least two transmission layers mapped by the precoding matrix, and the zero coefficient is a coefficient used as 0 in a plurality of coefficients of the precoding matrix; The non-zero coefficient indication information indicates a non-zero coefficient used in each of at least two transport layers, and the non-zero coefficient is a coefficient used as a non-zero value among a plurality of coefficients of the precoding matrix.

Optionally, the channel state information further includes at least one wideband amplitude coefficient; Here, one wideband amplitude coefficient corresponds to one compressed base vector of the codebook.

Optionally, the channel state information further includes at least one differential amplitude coefficient; Here, one differential amplitude coefficient corresponds to a differential coefficient of one wideband amplitude coefficient.

Here, in FIG. 4, it may include any number of buses and bridges connecting to each other, specifically, by various circuits of one or a plurality of processors including the processor 402 and memories including the memory 401. Connected. A bus architecture can connect many different circuits together, such as peripherals, current breakers and power management circuits. This is a well-known matter in the field of the present invention and will not be described further. A bus interface provides an interface. The transceiver 403 may be a plurality of elements, ie, including transmitters and receivers, providing elements that communicate with various other devices in a transmission medium. The processor 402 is responsible for managing the bus architecture and general processing, and the memory 401 may store data used when the processor 402 operates.

Referring to FIG. 5 , based on the spirit of the same invention, an embodiment of the present application provides a network device. The network device includes a receiving unit 501 and a parsing unit 502. Here, the receiving unit receives channel state information from the terminal device, wherein the channel state information includes base vector indication information, the base vector indication information is used to indicate a base vector compressed in a precoding matrix, and the compression the base vector belonging to the set of candidate base vectors, where the compressed base vector weighted by the coefficients of the precoding matrix constitutes a frequency domain characteristic of the precoding matrix; The parsing unit parses the channel state information according to the compressed base vector.

Optionally, a transmission unit 503 is further included, and the transmission unit 503 transmits configuration information to the terminal device, wherein the configuration information includes the number of compressed base vectors, the subband corresponding to the channel state information Indicates at least one of the number of and the number of beams corresponding to each transport layer mapped by the precoding matrix.

Optionally, the channel state information includes zero coefficient indication information or non-zero coefficient indication information. Here, the zero coefficient indication information indicates a zero coefficient used in each of the at least two transmission layers mapped by the precoding matrix, and the zero coefficient is a coefficient used as 0 in a plurality of coefficients of the precoding matrix; The non-zero coefficient indication information indicates a non-zero coefficient used in each of at least two transport layers, and the non-zero coefficient is a coefficient used as a non-zero value among a plurality of coefficients of the precoding matrix.

Optionally, the channel state information further includes at least one wideband amplitude coefficient; Here, one wideband amplitude coefficient corresponds to one compressed base vector of the codebook.

Optionally, the channel state information further includes at least one differential amplitude coefficient; Here, one differential amplitude coefficient corresponds to a differential coefficient of one wideband amplitude coefficient.

An entity device corresponding to the receiving unit, the parsing unit, and the transmitting unit in the network device may be the processor 402 or the transceiver 403 of FIG. 4 . The network device may execute the method provided by the embodiment shown in FIG. 1 . Therefore, functions that can be implemented by all functional modules of the network device may refer to the description of the embodiment shown in FIG. 1 . 1, repeated explanations are omitted here.

Based on the spirit of the same invention, an embodiment of the present application provides a computer readable storage medium storing computer instructions. When the computer instructions are executed on the computer, the computer executes the steps shown in FIG.

In a particular implementation process, computer readable storage media include universal serial bus flash drives (USB), mobile hard disks, read-only memory (ROM) and random access memory (RAM), magnetic disks, or optical disks. and a storage medium capable of storing other program codes.

The method for transmitting and receiving a channel state channel provided in an embodiment of the present application can be applied to a wireless communication system such as a 5G system. However, applicable communication systems include 5G systems or their evolved systems, other systems based on orthogonal frequency division multiplexing (OFDM), and DFT-S-OFDM (DFT-Spread OFDM, DFT extension OFDM). based systems, evolved long term evolution (eLTE) systems, and new network device systems. In practical application, the connection between the aforementioned devices may be a wireless connection or a wired connection.

It should be noted that the above communication system may include a plurality of terminal devices, and a network device may communicate (signaling transmission or data transmission) with a plurality of terminal devices. A terminal device related to an embodiment of the present application may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connectivity function, or another processing device connected to a wireless modem. A wireless user equipment may communicate with one or more core networks via a Radio Access Network (RAN). A terminal device may be a mobile terminal such as a mobile phone (also referred to as a "cellular" phone) and a mobile terminal. For example, it may be a portable, pocket sized, handheld, computer built or vehicle mounted mobile device that exchanges language and/or data with a radio access network. For example, Personal Communication Service (PCS) phones, wireless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs) and It may be other equipment. A terminal may also include a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal , an access terminal, a user terminal, a user agent, a user device, and a wireless device (wireless device).

A network device provided in an embodiment of the present invention may be a base station or may act as a router between a wireless terminal device and the rest of an access network by converting received air frames and IP packets. The remainder of the access network may include Internet Protocol (IP) network equipment. A network device may also be a device that coordinates attribute management of the air interface. For example, the network device is a base transceiver of a next-generation Node B (gNB), Global System for Mobile Communication (GSM), Code Division Multiple Access (Code Division Multiple Access), or Code Division Multiple Access (CDMA). Station, BTS), it may be a base station (NodeB) of wideband code division multiple access (WCDMA), an evolved base station of LTE (Evolutionary Node B, eNB), or an Enb or e-NodeB (evolutional Node B) of LTE, and It may be a network device of the same 5G system. The embodiments of the present application are not limited.

In the embodiments of this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, a division of a unit or units is only a logical function division. In actual implementation, there may be other partitioning methods. For example, various units or components may be coupled or incorporated into other systems, or some functions may be ignored or not implemented. Further, the mutual coupling or direct coupling or communication connection indicated or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The functional units of the embodiments of the present application may be integrated into one processing unit, or each unit may also be an independent physical module.

When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solutions of the embodiments of the present application may be implemented in the form of a software product. A computer software product includes several instructions stored on a storage medium and enabling a computer device. For example, a personal computer, server, network device, or the like, or a processor executes all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include universal serial bus flash drives (universal serial bus flash drives), mobile hard disks, ROM, RAM, magnetic disks or optical disks, and other media capable of storing program codes.

As described above, the above embodiments are used to specifically introduce the technical solutions of the present application, and the description of the above embodiments is only for understanding the methods of the embodiments of the present application, and should not be interpreted. as limiting embodiments of the present application. Any change or replacement readily conceivable by a person skilled in the art shall fall within the protection scope of the embodiments of the present application.

Claims (52)

As a method for transmitting channel state information,
determining a compressed base vector from a precoding matrix, the compressed base vector belonging to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct the frequency domain characteristics of; and
Transmitting channel state information to a network device, wherein the channel state information includes base vector indication information, and the base vector indication information is used to indicate the compressed base vector.
Including, determining the base vector compressed in the precoding matrix,
determining a base vector compressed in the precoding matrix according to configuration information from a network device or predefined configuration information;
the composition information indicates the number of the compressed base vectors;
The base vector indication information is an index combination of each base vector included in base vectors compressed in the candidate base vector set;
At least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layer consulted in the at least two transport layers uses the consulted compressed base vector case, the basic vector display information includes first sub-display information and second sub-display information;
The first sub-display information indicates a base vector set used in the at least two transport layers, and the second sub-display information indicates a base vector set used in each of the at least two transport layers.
A method for transmitting channel state information, characterized in that. According to claim 1,
The first sub-display information is included in the first part of the channel state information, and the second sub-display information is included in the second part of the channel state information.
A method for transmitting channel state information, characterized in that. As a method for receiving channel state information,
Receiving channel state information from a terminal device, wherein the channel state information includes base vector indication information, the base vector indication information is used to indicate a base vector compressed in a precoding matrix, and the compressed base vector belongs to a set of candidate base vectors, where the compressed base vectors weighted by coefficients of the precoding matrix are used to construct frequency domain characteristics of the precoding matrix; and
Parsing the channel state information according to the compressed base vector;
Before receiving channel state information from the terminal device,
sending configuration information to the terminal device;
the composition information indicates the number of the compressed base vectors;
The base vector indication information is an index combination of each base vector included in base vectors compressed in the candidate base vector set;
At least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layer consulted in the at least two transport layers uses the consulted compressed base vector case, the basic vector display information includes first sub-display information and second sub-display information;
The first sub-display information indicates a base vector set used in the at least two transport layers, and the second sub-display information indicates a base vector set used in each of the at least two transport layers.
A method for receiving channel state information, characterized in that. According to claim 3,
The first sub-display information is included in the first part of the channel state information, and the second sub-display information is included in the second part of the channel state information.
A method for receiving channel state information, characterized in that. a memory configured to store instructions; and
a processor configured to read instructions from the memory and perform the method according to claim 1 or 2
A terminal device characterized in that. As a network device,
a memory configured to store instructions; and
A processor configured to read instructions from the memory to perform the method according to claim 3 or 4. As a terminal device,
a decision unit configured to determine a compressed base vector in a precoding matrix, the compressed base vector belonging to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct the frequency domain characteristics of the coding matrix; and
A transmission unit configured to transmit channel state information to a network device, wherein the channel state information includes base vector indication information, wherein the base vector indication information is used to indicate the compressed base vector.
including,
The determining unit determines the base vector compressed in the precoding matrix,
determining a base vector compressed in the precoding matrix according to configuration information from a network device or predefined configuration information;
the composition information indicates the number of the compressed base vectors;
The base vector indication information is an index combination of each base vector included in base vectors compressed in the candidate base vector set;
At least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layer consulted in the at least two transport layers uses the consulted compressed base vector case, the basic vector display information includes first sub-display information and second sub-display information;
The first sub-display information indicates a base vector set used in the at least two transport layers, and the second sub-display information indicates a base vector set used in each of the at least two transport layers.
A terminal device characterized in that. As a network device,
A receiving unit configured to receive channel state information from a terminal device, wherein the channel state information includes base vector indication information, the base vector indication information is used to indicate a base vector compressed in a precoding matrix, and the compressed base vector a base vector belongs to a set of candidate base vectors, wherein the compressed base vector weighted by coefficients of the precoding matrix is used to construct frequency domain characteristics of the precoding matrix;
a parsing unit configured to parse the channel state information according to the compressed base vector; and
a transmitting unit that transmits configuration information indicating the number of the compressed base vectors to the terminal device;
The base vector indication information is an index combination of each base vector included in base vectors compressed in the candidate base vector set;
At least one beam corresponding to each of the at least two transport layers mapped by the precoding matrix uses the same base vector set, and the transport layer consulted in the at least two transport layers uses the consulted compressed base vector case, the basic vector display information includes first sub-display information and second sub-display information;
The first sub-display information indicates a base vector set used in the at least two transport layers, and the second sub-display information indicates a base vector set used in each of the at least two transport layers.
Network device characterized in that. As a computer readable storage medium,
A computer-readable storage medium which stores computer instructions, which, when executed on a computer, causes the computer to execute the method according to claim 1 or 2 or 3 or 4. . delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

Images