CN111934734B

CN111934734B - CSI reporting method, CSI receiving method, terminal and network side equipment

Info

Publication number: CN111934734B
Application number: CN201910395509.3A
Authority: CN
Inventors: 李辉; 高秋彬; 刘正宣
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2022-02-22
Anticipated expiration: 2039-05-13
Also published as: CN111934734A

Abstract

The embodiment of the invention provides a CSI reporting method, a CSI receiving method, a terminal and network side equipment, wherein the method comprises the following steps: the terminal determines a first frequency domain basis vector set of each transmission layer, wherein the frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer all belong to a second frequency domain basis vector set; the terminal feeds back CSI, wherein the CSI comprises information of a first frequency-domain base vector set of each transmission layer. The embodiment of the invention can improve the CSI feedback performance.

Description

CSI reporting method, CSI receiving method, terminal and network side equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a Channel State Information (CSI) reporting method, a CSI receiving method, a terminal, and a network side device.

Background

New codebooks are introduced in communication systems, for example: a type ii (type ii) codebook, and further introduces a low overhead codebook based on linear combining of orthogonal beams and subband coefficient compression to reduce the overhead of the codebook. For example: taking rank (rank) as an example, for all subbands, the codebook may be expressed as:

wherein, W₁May be included in the orthogonal combined beams,

denotes the coefficient after compression, W_fA set of frequency-domain basis vectors is represented, which contains M frequency-domain basis vectors.

Due to the fact that the codebook is updated, the existing CSI feedback cannot support the reporting of parameters of the compressed codebook, and the CSI feedback performance is poor.

Disclosure of Invention

The embodiment of the invention provides a CSI reporting method, a CSI receiving method, a terminal and network side equipment, and aims to solve the problem that the CSI feedback performance is poor.

The embodiment of the invention provides a CSI reporting method, which is characterized by comprising the following steps:

the terminal determines a first frequency domain basis vector set of each transmission layer, wherein the frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer all belong to a second frequency domain basis vector set;

the terminal feeds back CSI, wherein the CSI comprises information of a first frequency-domain base vector set of each transmission layer.

Optionally, the determining, by the terminal, a first set of frequency-domain basis vectors for each transmission layer includes:

the terminal respectively determines a first frequency domain basis vector set of each transmission layer from the second frequency domain basis vector set; or

The terminal determines a third frequency domain basis vector set and determines a first frequency domain basis vector set of each transmission layer, wherein the frequency domain basis vectors in the third frequency domain basis vector set belong to the second frequency domain basis vector set, and the frequency domain basis vectors in the first frequency domain basis vector set belong to the third frequency domain basis vector set.

Optionally, the CSI further includes: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

Optionally, the number of frequency domain basis vectors of the third frequency domain basis vector set is less than the number of maximum frequency domain basis vectors, where the maximum frequency domain basis vectors are:

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the determining, by the terminal, a third frequency domain basis vector set includes:

and the terminal determines a third frequency domain basis vector set according to the basis vector number threshold value.

Optionally, the determining, by the terminal, a third frequency domain basis vector set according to the basis vector number threshold includes:

and the terminal determines the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set.

Optionally, the number of frequency domain basis vectors of the third frequency domain basis vector set is:

the number of frequency domain basis vectors determined by the terminal; or

Determining the number of frequency domain basis vectors according to the corresponding relation between the number of predefined frequency domain basis vectors and codebook parameters; or

And the number of the frequency domain basis vectors configured by the network side equipment.

Optionally, the determining, by the terminal, the third frequency domain basis vector set according to the comparison result between the basis vector number threshold and the frequency domain basis vector number of the third frequency domain basis vector set includes:

the terminal selects the frequency domain basis vectors from the second frequency domain basis vector set as the third frequency domain basis vector set in an unconstrained manner according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set; or

The terminal selects adjacent frequency domain basis vectors from the second frequency domain basis vector set as the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set; or

And the terminal determines the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set and the corresponding relation between the predefined frequency domain basis vector set and the codebook parameters.

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

Optionally, the CSI further includes: information of a third set of frequency domain basis vectors.

Optionally, the information of the third frequency domain basis vector set includes:

and determining the information of the third frequency domain basis vector set according to the comparison result of the frequency domain basis vector number of the third frequency domain basis vector set and the basis vector number threshold value.

Optionally, the information of the third frequency domain basis vector set includes one of:

information of each frequency domain basis vector in the third set of frequency domain basis vectors;

information of starting frequency domain basis vectors within the set of third frequency domain basis vectors;

information of an ending frequency-domain basis vector within the set of third frequency-domain basis vectors.

Optionally, the information of the first frequency-domain basis vector set includes:

an index of a frequency-domain basis vector within the first set of frequency-domain basis vectors.

The embodiment of the invention also provides a CSI receiving method, which comprises the following steps:

the method comprises the steps that network side equipment receives CSI, wherein the CSI comprises information of a first frequency domain base vector set of each transmission layer, and frequency domain base vectors in the first frequency domain base vector set of each transmission layer all belong to a second frequency domain base vector set.

Optionally, the first set of frequency-domain basis vectors of each transmission layer includes:

a first set of frequency-domain basis vectors for each transmission layer respectively determined from the second set of frequency-domain basis vectors; or

And respectively determining a first frequency domain basis vector set of each transmission layer from a third frequency domain basis vector set, wherein the frequency domain basis vector set in the third frequency domain basis vector set belongs to the second frequency domain basis vector set.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the third set of frequency domain basis vectors includes:

and determining a third frequency domain basis vector set according to the basis vector number threshold value.

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

An embodiment of the present invention further provides a terminal, including:

a determining module, configured to determine a first set of frequency-domain basis vectors for each transmission layer, where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer all belong to a second set of frequency-domain basis vectors;

a feedback module configured to feed back CSI, where the CSI includes information of the first set of frequency-domain basis vectors for each transmission layer.

Optionally, the determining module is configured to determine a first set of frequency-domain basis vectors of each transmission layer from the second set of frequency-domain basis vectors respectively; or

The determining module is configured to determine a third set of frequency domain basis vectors and determine a first set of frequency domain basis vectors of each transmission layer, where the frequency domain basis vectors in the third set of frequency domain basis vectors belong to the second set of frequency domain basis vectors, and the frequency domain basis vectors in the first set of frequency domain basis vectors belong to the third set of frequency domain basis vectors.

An embodiment of the present invention further provides a network side device, including:

the receiver is configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors of each transmission layer, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors of each transmission layer all belong to a second set of frequency-domain basis vectors.

An embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to determine a first set of frequency-domain basis vectors for each transmission layer, where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer all belong to a second set of frequency-domain basis vectors; and feeding back CSI, wherein the CSI comprises information of the first set of frequency-domain basis vectors for each transmission layer.

Optionally, the determining the first set of frequency-domain basis vectors for each transmission layer includes:

respectively determining a first frequency domain basis vector set of each transmission layer from the second frequency domain basis vector set; or

Determining a third frequency domain basis vector set, and determining a first frequency domain basis vector set of each transmission layer, wherein the frequency domain basis vectors in the third frequency domain basis vector set belong to the second frequency domain basis vector set, and the frequency domain basis vectors in the first frequency domain basis vector set belong to the third frequency domain basis vector set.

An embodiment of the present invention further provides a network side device, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors of each transmission layer, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors of each transmission layer all belong to a second set of frequency-domain basis vectors.

Optionally, the third set of frequency domain basis vectors includes:

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the program is executed by a processor, the method for reporting CSI provided in the embodiment of the present invention is implemented, or when the program is executed by the processor, the method for receiving CSI provided in the embodiment of the present invention is implemented.

In the embodiment of the invention, a terminal determines a first frequency domain basis vector set of each transmission layer, wherein frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer belong to a second frequency domain basis vector set; the terminal feeds back CSI, wherein the CSI comprises information of a first frequency-domain base vector set of each transmission layer. Therefore, the information of the first frequency domain base vector set of each transmission layer can be reported in the CSI, and the CSI feedback performance is improved.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

fig. 2 is a flowchart of a CSI reporting method according to an embodiment of the present invention;

fig. 3 is a flowchart of a CSI receiving method according to an embodiment of the present invention;

fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 5 is a structural diagram of a network side device according to an embodiment of the present invention;

fig. 6 is a block diagram of another terminal provided in an embodiment of the present invention;

fig. 7 is a block diagram of another network-side device according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which the embodiment of the present invention is applicable, and as shown in fig. 1, the network structure includes a terminal 11 and a network side device 12, where the terminal 11 may be a User Equipment (UE) or other terminal devices, for example: the present invention relates to a Mobile terminal, and more particularly to a Mobile terminal, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), a robot, a vehicle, and other terminal-side devices. The network side device 12 may be a base station, for example: macro station, LTE eNB, 5G NR NB, etc.; the network side device may also be a small station, such as a Low Power Node (LPN), pico, femto, or the network side device may be an Access Point (AP); the network side device may also be a network node formed by a Central Unit (CU) and a plurality of Transmission Reception Points (TRPs) managed and controlled by the CU. It should be noted that, in the embodiment of the present invention, the specific type of the network-side device is not limited.

Referring to fig. 2, fig. 2 is a flowchart of a CSI reporting method according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:

201. the terminal determines a first frequency domain basis vector set of each transmission layer, wherein the frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer all belong to a second frequency domain basis vector set;

202. the terminal feeds back CSI, wherein the CSI comprises information of a first frequency-domain base vector set of each transmission layer.

Each transmission layer may be each transmission layer of at least one transmission layer corresponding to the CSI, for example: the rank (rank) 1 indicates a unique transmission layer, and the rank (rank) 2 indicates each of 2 transmission layers.

The first set of frequency-domain basis vectors refers to a respective first set of frequency-domain basis vectors for each transmission layer, and the determining of the first set of frequency-domain basis vectors for each transmission layer may be determining the first set of frequency-domain basis vectors for the first layer and determining the first set of frequency-domain basis vectors for the second layer.

In this embodiment of the present invention, the first set of frequency-domain basis vectors may refer to a set of frequency-domain basis vectors included in a codebook of a transmission layer, for example: taking rank (rank) as an example, for all subbands, the codebook may be expressed as:

wherein, W₁May be included in the orthogonal combined beams,

denotes the coefficient after compression, W_fThe first set of frequency-domain basis vectors is shown, which may contain M frequency-domain basis vectors.

Another example is: taking rank (rank) 2 as an example, the codebook of the first layer may be represented as:

wherein, W₁May be included in the orthogonal combined beams,

representing compressed coefficients, may contain 2L M coefficients,

a first set of frequency-domain basis vectors representing a first layer, where M frequency-domain basis vectors may be included.

The codebook of the second layer may be expressed as:

wherein, W₁Which contains 2L of the beams,

representing compressed coefficients, may comprise 2L M coefficients,

a first set of frequency-domain basis vectors representing a second layer, where M frequency-domain basis vectors may be included.

In this embodiment of the present invention, the second frequency-domain basis vector set may be a second frequency-domain basis vector set determined according to a correspondence relationship between a Precoding Matrix Indicator (PMI) subband number and a frequency-domain basis vector number of the second frequency-domain basis vector set, for example: determining a second set of frequency-domain basis vectors comprising N3 frequency-domain basis vectors, each frequency-domain basis vector having a length of N3, the second set of frequency-domain basis vectors being representable as:

the correspondence relationship may be predefined by a protocol, or configured by the network side device to the terminal, which is not limited in this respect.

Of course, the second frequency domain basis vector set may also be determined by the terminal according to the configuration of the network side, and the like, which is not limited in this embodiment of the present invention.

The frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer all belong to the second frequency domain basis vector set, and any frequency domain basis vector in any first frequency domain basis vector set all belongs to the second frequency domain basis vector set, so that the frequency domain basis vectors used by each transmission layer all belong to the same frequency domain basis vector set, and the data transmission performance is improved.

The terminal feeding back CSI may be sending CSI to the network side device.

In the embodiment of the invention, the reporting of the information of the first frequency domain base vector set of each transmission layer in the CSI can be realized through the steps, so that the CSI feedback performance is improved.

It should be noted that, in this embodiment of the present invention, the first set of frequency-domain basis vectors may be a set of frequency-domain basis vectors of a compressed codebook, for example: a set of frequency-domain basis vectors of a type II (type II) codebook. Of course, the embodiment of the present invention is not limited to the Type II codebook frequency-domain basis vector set, and may also be a codebook that is newly introduced in a subsequent protocol version and includes a frequency-domain basis vector set. And the first set of frequency-domain basis vectors may also be some sets of frequency-domain basis vectors of uncompressed codebooks.

As an optional implementation manner, the determining, by the terminal, a first set of frequency-domain basis vectors for each transmission layer includes:

In this embodiment, the terminal may directly determine the first frequency domain basis vector set of each transmission layer from the second frequency domain basis vector set, and then determine the third frequency domain basis vector set. For example: and respectively determining the first frequency domain basis vector set of each transmission layer in the second frequency domain basis vector set without constraint, or respectively determining the first frequency domain basis vector set of each transmission layer in the second frequency domain basis vector set according to a predetermined corresponding relation or condition.

In addition, in this embodiment, the third set of frequency domain basis vectors may be determined first, and then the first set of frequency domain basis vectors of each transmission layer may be determined. The frequency domain basis vectors in the first set of frequency domain basis vectors belong to the third set of frequency domain basis vectors, and the frequency domain basis vectors in the first set of frequency domain basis vectors of each transmission layer all belong to the third set of frequency domain basis vectors.

In the foregoing embodiment, it can be ensured that the frequency domain basis vectors in the first frequency domain basis vector set of each transmission layer all belong to the third frequency domain basis vector set, so as to improve the transmission performance of the terminal. In addition, since the third frequency domain basis vector set is determined from the second frequency domain basis vector set and the first frequency domain basis vector set, the complexity of determining the first frequency domain basis vector set by each transmission layer is reduced, and the relevance between the transmission layers is increased, so as to improve the transmission performance of the terminal.

The number of frequency domain basis vectors of the third frequency domain basis vector set may be smaller than the number of maximum frequency domain basis vectors, and the number of maximum frequency domain basis vectors may be:

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Wherein, the threshold value of the number of basis vectors may include:

one or more basis vector number threshold values.

Further, the threshold value of the number of basis vectors may be:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

The determining, by the terminal, the third frequency domain basis vector set according to the basis vector number threshold may include:

The determining the third frequency domain basis vector set according to the comparison result between the threshold value of the number of basis vectors and the number of frequency domain basis vectors of the third frequency domain basis vector set may include, but is not limited to:

The terminal may select a frequency domain basis vector from the second frequency domain basis vector set as the third frequency domain basis vector set without constraint according to the comparison result between the basis vector number threshold and the frequency domain basis vector number of the third frequency domain basis vector set, and select a frequency domain basis vector from the second frequency domain basis vector set without constraint as the third frequency domain basis vector set when the frequency domain basis vector number of the third frequency domain basis vector set is less than or equal to the basis vector number threshold. Or, in a case where a plurality of basis vector number thresholds are included, the number of frequency domain basis vectors in the third frequency domain basis vector set may be greater than the first basis vector number threshold and smaller than or equal to the second basis vector number threshold, and the frequency domain basis vectors are selected from the second frequency domain basis vector set as the third frequency domain basis vector set without constraint.

The terminal may select, according to the comparison result between the threshold of the number of basis vectors and the number of frequency domain basis vectors in the third frequency domain basis vector set, an adjacent frequency domain basis vector from the second frequency domain basis vector set as the third frequency domain basis vector set, where the frequency domain basis vector of the third frequency domain basis vector set is greater than the threshold of the number of basis vectors, and the frequency domain basis vector is selected from the second frequency domain basis vector set as the third frequency domain basis vector set without constraint. Or, in a case where a plurality of basis vector number thresholds are included, the number of frequency domain basis vectors in the third frequency domain basis vector set may be greater than all or part of the basis vector number thresholds, and the frequency domain basis vectors are selected from the second frequency domain basis vector set as the third frequency domain basis vector set without constraint.

The terminal determines, according to the comparison result between the threshold of the number of basis vectors and the number of frequency domain basis vectors in the third frequency domain basis vector set and the correspondence between the predefined set of frequency domain basis vectors and codebook parameters, that the third frequency domain basis vector set may be determined according to the correspondence between the predefined set of frequency domain basis vectors and codebook parameters when the number of frequency domain basis vectors in the third frequency domain basis vector set is greater than the threshold of the number of basis vectors. Or, in a case that the codebook parameter includes a plurality of basis vector number thresholds, the codebook parameter may be a predefined correspondence between the frequency domain basis vector set and the codebook parameter in a case that the number of frequency domain basis vectors in the third frequency domain basis vector set is greater than all or part of the basis vector number thresholds.

The predefined correspondence between the frequency domain basis vector set and the codebook parameters may be a correspondence between an index of the frequency domain basis vector and the codebook parameters, so that after the codebook parameters are determined, the third frequency domain basis vector set may be determined according to the correspondence. Of course, this is not limited, for example: the predefined correspondence between the set of frequency-domain basis vectors and the codebook parameters may be a functional relationship between the index of the frequency-domain basis vector and the codebook parameters, such as: the number N of frequency domain basis vectors taking the codebook parameters as a third frequency domain basis vector set_intSFor example, N is as described above_intSThe corresponding relation between the values and the frequency domain basis vectors in the third frequency domain basis vector set is that the third frequency domain basis vector index set is as follows:

{N3-N_intS/2,N3-N_intS/2+1,…,N_intS-1,0,1,2,…,N_intS/2-1}

if N is present_th＝6，N_intS8, N3, M4, and the second set of frequency-domain basis vectors is determined as [ c ═ c₉ c₁₀ c₁₁ c₁₂ c₀c₁ c₂ c₃]。

It should be noted that the codebook parameter may be a codebook parameter such as a network side configuration, a protocol contract, and the like, and in the embodiment of the present invention, the codebook parameter is not limited, and may be any parameter in a codebook.

In the foregoing embodiment, the third frequency domain basis vector set may be flexibly determined according to the comparison result between the threshold value of the number of basis vectors and the number of frequency domain basis vectors in the third frequency domain basis vector set, so as to adapt to the requirements of different scenes and services.

Optionally, the number of frequency domain basis vectors in the third frequency domain basis vector set may be:

the number of frequency domain basis vectors determined by the terminal; or

The number of the frequency domain basis vectors determined by the terminal may be the number of the frequency domain basis vectors of the third frequency domain basis vector set determined by the terminal according to the service, the requirement or the terminal performance.

The corresponding relation between the number of the frequency domain basis vectors and the codebook parameters, and the codebook parameters can be configured to the terminal by the network side, agreed in the protocol, and the like. And the codebook parameters in the corresponding relationship between the number of the frequency domain basis vectors and the codebook parameters and the corresponding relationship between the frequency domain basis vector set and the codebook parameters can be the same or different parameters.

In this embodiment, the terminal may determine the number of basis vectors in the third frequency domain basis vector set, compare the number of basis vectors with a threshold of the number of basis vectors, and determine the third frequency domain basis vector set according to the comparison result; or, the system may predefine the corresponding relationship between the number of basis vectors in the third frequency domain basis vector set and the codebook parameters, obtain the number of basis vectors in the third frequency domain basis vector set according to the codebook parameters configured by the network side, compare the number of basis vectors with the threshold of the number of basis vectors, and determine the third frequency domain basis vector set according to the comparison result, or, the system may configure the number of basis vectors in the third frequency domain basis vector set by the network side, compare the number of basis vectors with the threshold of the number of basis vectors, and determine the third frequency domain basis vector set according to the comparison result.

It should be noted that, in the embodiment of the present invention, the third frequency domain basis vector set is determined according to the number threshold of the basis vectors, for example: in some embodiments, in the case that the number of frequency domain basis vectors of the third set of frequency domain basis vectors is determined, the corresponding third set of frequency domain basis vectors may be directly determined from the second set of frequency domain basis vectors without comparing with the basis vector number threshold. Further, the terminal determines the third frequency domain basis vector set according to the basis vector number threshold, and does not limit determining the third frequency domain basis vector set according to the comparison result between the basis vector number threshold and the frequency domain basis vector number of the third frequency domain basis vector set, for example: the threshold number of frequency domain basis vectors may be directly determined in the second set of frequency domain basis vectors as the third set of frequency domain basis vectors.

As an optional implementation, the CSI further includes: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

In both embodiments, the CSI may include the number of frequency-domain basis vectors of the third frequency-domain basis vector set, where the first frequency-domain basis vector set of each transmission layer is determined by the terminal from the second frequency-domain basis vector set, or the terminal determines the third frequency-domain basis vector set and determines the first frequency-domain basis vector set of each transmission layer.

The number of the frequency domain basis vectors of the third frequency domain basis vector set is reported, so that the CSI feedback information is more convenient, and the network side equipment can determine the codebook used by the terminal more conveniently.

As an optional implementation, the CSI further includes: information of a third set of frequency domain basis vectors.

The information of the third set of frequency domain basis vectors may be an index of the frequency domain basis vector, or quantization information of the frequency domain basis vector, or the like.

The information of the third frequency domain base vector set is reported, so that the CSI feedback information is more convenient, and the network side equipment can determine the codebook used by the terminal more conveniently.

Further, the information of the third set of frequency domain basis vectors may include information of a starting frequency domain basis vector and information of an ending frequency domain basis vector.

For example: when the number of the frequency domain basis vectors of a third frequency domain basis vector set is less than or equal to the threshold value of the number of the basis vectors, the information of the third frequency domain basis vector set is the information of all the frequency domain basis vectors of the third frequency domain basis vector set; or, when the number of the frequency domain basis vectors of the third frequency domain basis vector set is greater than the threshold value of the number of the basis vectors, the information of the third frequency domain basis vector set is the information of the starting frequency domain basis vector and/or the information of the ending frequency domain basis vector of the third frequency domain basis vector set.

In this embodiment, the reporting information of the CSI can be determined according to the magnitude relationship between the number of basis vectors in the third frequency domain basis vector set and the threshold value of the number of basis vectors, so that different information can be reported according to actual conditions, thereby reducing the cost of the CSI.

As an optional implementation manner, the information of the first set of frequency-domain basis vectors includes:

The index of the frequency-domain basis vector may be a relative index, for example: and indexes in the third frequency domain base vector set can reduce CSI overhead. Of course, this is not limited, for example: may be an index in the second set of frequency-domain basis vectors described above.

In the embodiment, only the index needs to be reported, so that the CSI overhead is reduced. Of course, the embodiment of the present invention is not limited thereto, for example: the information of the first set of frequency-domain basis vectors may also be quantized values of the frequency-domain basis vectors or other information.

Referring to fig. 3, fig. 3 is a flowchart of a CSI receiving method according to an embodiment of the present invention, as shown in fig. 3, including the following steps:

301. the method comprises the steps that network side equipment receives CSI, wherein the CSI comprises information of a first frequency domain base vector set of each transmission layer, and frequency domain base vectors in the first frequency domain base vector set of each transmission layer all belong to a second frequency domain base vector set.

And the first frequency domain basis vector set of each transmission layer is respectively determined from the third frequency domain basis vector sets, wherein the frequency domain basis vector sets in the third frequency domain basis vector sets belong to the second frequency domain basis vector set.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the third set of frequency domain basis vectors includes:

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

It should be noted that, this embodiment is used as an implementation of the network side device corresponding to the embodiment shown in fig. 2, and specific implementation thereof may refer to the relevant description of the embodiment shown in fig. 2, so that, in order to avoid repeated description, the embodiment is not described again, and the same beneficial effects may also be achieved.

The method provided by the embodiment of the present invention is exemplified by a plurality of embodiments by taking a Type II codebook as an example below:

example 1:

according to the corresponding relation between the number of PMI subbands predetermined by the system and the number of the second frequency domain basis vector sets, the terminal and the network side device side can determine that the second frequency domain basis vector set contains N3 frequency domain basis vectors, and the length of each frequency domain basis vector is N3. Expressed as:

for each layer, the precoding matrix uses 2L beams, and the first set of frequency-domain basis vectors used by each layer of the network-side device configuration terminal includes M frequency-domain basis vectors. For a Type II codebook with Rank 2, its first layer precoding (or codebook) is expressed as:

the second layer precoding (or codebook) is represented as:

here, W₁Which contains 2L of the beams,

contains 2L M coefficients. W_f,0/W_f,1Respectively representing a first set of frequency-domain basis vectors for the first layer and a first set of frequency-domain basis vectors for the second layer. Each set contains M basis vectors.

The threshold value of the number of the predefined base vectors of the system is N_thAnd only one base vector number threshold value. In addition, the system predefines the terminal to report the number N of the frequency domain basis vectors in the third frequency domain basis vector set_intS。

The terminal determines that the number of the frequency domain basis vectors in the third frequency domain basis vector set is N_intS. If N is present_intS≤N_thThen N is_intSThe frequency domain basis vectors are derived from a second set W of frequency domain basis vectors_fIs determined without constraints. E.g. N_th＝6，N_intSN3 is 13 and M is 4. The third set of frequency domain basis vectors includes a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is W_f,0＝[c₁ c₂ c₇ c₁₀]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₁ c₂ c₅c₇]. If N is present_intS>N_thThen N is_intSThe frequency domain basis vectors are derived from a second set W of frequency domain basis vectors_fIs determined under the condition that the frequency domain basis vectors must be continuous. E.g. N_th＝6，N_intS8, 13 for N3 and 4 for M. The third set of frequency domain basis vectors includes a basis vector [ c ]₉ c₁₀ c₁₁ c₁₂ c₀ c₁ c₂ c₃]The first frequency domain basis vector set of the first layer is W_f,0＝[c₁ c₂ c₉ c₁₁]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₀ c₃ c₁₁ c₁₂]。

Determining the number N of frequency domain basis vectors in a third frequency domain basis vector set_intSThe method of (3) is as follows. And the terminal respectively determines the first frequency-domain basis vector set of the first layer and the first frequency-domain basis vector set of the second layer from the second frequency-domain basis vector set without constraint conditions. Taking the number of basis vectors in the union of the frequency domain basis vectors in the two first frequency domain basis vector sets determined respectively as the initial N_intS0. If this is N_intS0≤N_thThen determine N_intS＝N_intS0. If N is present_intS0>N_thThe number of interval basis vectors of the start frequency domain basis vector and the end frequency domain basis vector in the merged set is taken as N_intS. As in the above example, the first set of frequency-domain basis vectors of the first layer is W_f,0＝[c₁ c₂ c₉ c₁₁]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₀ c₃c₁₁ c₁₂]. The union of the two sets is [ c ]₀ c₁ c₂ c₃ c₉ c₁₁ c₁₂]，N_intS0If 7 is greater than the threshold, then this is trueThe starting frequency domain basis vector in the union is c₉The terminating frequency domain basis vector is c₃Spaced 8 frequency domain basis vectors, thus determining N_intS. The starting frequency domain basis vector is c₉Refers to the above union [ c₀ c₁ c₂ c₃ c₉ c₁₁ c₁₂]After sorting according to continuous frequency domain basis vectors [ c₉ c₁₁ c₁₂ c₀ c₁ c₂ c₃]The starting frequency domain basis vectors of (1).

The terminal reports the number N of the frequency domain basis vectors in the determined third frequency domain basis vector set on the CSI first part_intS. If N is present_intS≤N_thThe terminal reports a third set of frequency domain basis vectors in the CSI second part, as in [ c ] in the above example₁ c₂ c₅ c₇c₁₀]. If N is present_intS>N_thAnd the terminal reports the initial frequency domain basis vector information in the third frequency domain basis vector set on the second part of the CSI, such as c in the above example₉. And simultaneously reporting a first frequency domain basis vector set of the first layer and the second layer by the terminal, wherein the first frequency domain basis vector set uses a relative index indication, namely an index of the frequency domain basis vector in a third frequency domain basis vector set. For example, the set of third frequency domain basis vectors includes a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is W_f,0＝[c₁ c₂ c₇ c₁₀]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₁ c₂ c₅ c₇]. When the terminal reports, the index of the first frequency domain base vector set of the first layer to the third frequency domain base vector set is [0,1,3,4 ]]Is 4 basis vectors, the index of the first set of frequency domain basis vectors of the second layer into the third set of frequency domain basis vectors is [0,1,2,3]M is 4 basis vectors.

It may use a 5-bit bitmap indication or a combined number

And (4) indicating.

Example 2:

for each layer, the precoding matrix uses 2L beams, and the first set of frequency-domain basis vectors used by each layer of the network-side device configuration terminal includes M frequency-domain basis vectors. For a Type II codebook with Rank 2, its first layer precoding is represented as:

the second layer precoding is represented as:

here, W₁Which contains 2L of the beams,

The threshold value of the number of the predefined base vectors of the system is N_thAnd only one base vector number threshold value. In addition, the system predefines the number N of frequency domain basis vectors in the third set of frequency domain basis vectors_intSSatisfies a predefined relationship with M (e.g., N)_intS2M), and N_intSNo reporting is required.

The terminal determines a third frequency domain basis vector set according to codebook parameters configured by the network side equipmentThe number of frequency domain basis vectors in the sum is N_intS. If N is present_intS≤N_thThen N is_intSThe frequency domain basis vectors are derived from a second set W of frequency domain basis vectors_fIs determined without constraints. E.g. N_th＝6，N_intSN3 is 13 and M is 4. The terminal determines that the third frequency domain basis vector set comprises a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is selected from the third frequency domain basis vector set as W_f,0＝[c₁ c₂ c₇ c₁₀]The first frequency domain basis vector set of the second layer is selected from the third frequency domain basis vector set as W_f,1＝[c₁ c₂ c₅ c₇]. If N is present_th＝6，N_intSWhen the value is 5, the N is_intSThe frequency domain basis vectors are derived from a second set W of frequency domain basis vectors_fIs determined under the condition that the frequency domain basis vectors must be continuous. E.g. N_th，N_intS8, 13 for N3 and 4 for M. The third frequency domain basis vector set is determined as [ c ]₉ c₁₀ c₁₁ c₁₂ c₀ c₁ c₂ c₃]The first frequency domain basis vector set of the first layer is selected from the third frequency domain basis vector set as W_f,0＝[c₁ c₂ c₉ c₁₁]The first frequency domain basis vector set of the second layer is selected from the third frequency domain basis vector set as W_f,1＝[c₀ c₃ c₁₁ c₁₂]。

If N is present_intS≤N_thThe terminal reports a third set of frequency domain basis vectors in the CSI second part, as in [ c ] in the above example₁ c₂ c₅c₇ c₁₀]. If N is present_intS>N_thAnd the terminal reports the initial frequency domain basis vector information in the third frequency domain basis vector set on the second part of the CSI, such as c in the above example₉. The terminal reports the first frequency domain base vector set of the first layer and the second layer at the same time, and the relative index indication is used, namely the index of the frequency domain base vector in the third frequency domain base vector set. For example, the set of third frequency domain basis vectors includes a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is W_f,0＝[c₁ c₂ c₇ c₁₀]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₁ c₂ c₅ c₇]. When the terminal reports, the index of the first frequency domain base vector set of the first layer to the third frequency domain base vector set is [0,1,3,4 ]]Is 4 basis vectors, the index of the first set of frequency domain basis vectors of the second layer into the third set of frequency domain basis vectors is [0,1,2,3]M is 4 basis vectors.

It may use a 5-bit bitmap indication or a combined number

And (4) indicating.

Example 3:

the second layer precoding is represented as:

here, W₁Which contains 2L of the beams,

The threshold value of the number of the predefined base vectors of the system is N_thAnd only one base vector number threshold value. In addition, the system predefines the number N of frequency domain basis vectors in the third set of frequency domain basis vectors_intSSatisfies a predefined relationship with M (e.g., N)_intS2M), and N_intSNo reporting is required. Simultaneous system predefinition N_intS>N_thWhen N is present_intSAnd (3) taking the corresponding relation between the values and the basis vectors in the third frequency domain basis vector set, wherein the third frequency domain basis vector set does not need to be reported.

The terminal determines that the number of the frequency domain basis vectors in the third frequency domain basis vector set is N according to codebook parameters configured by the network side equipment_intS. If N is present_intSN is less than or equal to Nth, then N is_intSThe frequency domain basis vectors are derived from a second set W of frequency domain basis vectors_fIs determined without constraints. E.g. N_th＝6，N_intSN3 is 13 and M is 4. The terminal determines that the third frequency domain basis vector set comprises a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is selected from the third frequency domain basis vector set as W_f,0＝[c₁ c₂ c₇ c₁₀]The first frequency domain basis vector set of the second layer is selected from the third frequency domain basis vector set as W_f,1＝[c₁ c₂ c₅ c₇]. If N is present_intS>N_thThen the terminal predefines N according to the system_intSAnd determining a third frequency domain basis vector set by taking the corresponding relation between the values and the basis vectors in the third frequency domain basis vector set. E.g. system predefined N_intSThe corresponding relation between the value and the basis vector in the third frequency domain basis vector set is that the second basis vector index set is:

{N3-N_intS/2,N3-N_intS/2+1,…,N_intS-1,0,1,2,…,N_intS/2-1}

if N is present_th＝6，N_intS8, N3, M4, and the third set of frequency domain basis vectors is determined as [ c [₉ c₁₀ c₁₁ c₁₂ c₀c₁ c₂ c₃]The first frequency domain basis vector set of the first layer is selected from the third frequency domain basis vector set as W_f,0＝[c₁ c₂c₉ c₁₁]The first frequency domain basis vector set of the second layer is selected from the third frequency domain basis vector set as W_f,1＝[c₀ c₃c₁₁ c₁₂]。

If N is present_intS≤N_thThe terminal reports a third set of frequency domain basis vectors in the CSI second part, as in [ c ] in the above example₁ c₂ c₅c₇ c₁₀]. If N is present_intS>N_thAnd the terminal does not report the third frequency domain base vector set. And simultaneously reporting a first frequency domain basis vector set of the first layer and the second layer by the terminal, wherein the first frequency domain basis vector set uses a relative index indication, namely an index of the frequency domain basis vector in a third frequency domain basis vector set. For example, the set of third frequency domain basis vectors includes a basis vector [ c ]₁ c₂ c₅ c₇ c₁₀]The first frequency domain basis vector set of the first layer is W_f,0＝[c₁ c₂ c₇ c₁₀]The first set of frequency-domain basis vectors of the second layer is W_f,1＝[c₁ c₂ c₅ c₇]. When the terminal reports, the index of the first frequency domain base vector set of the first layer to the third frequency domain base vector set is [0,1,3,4 ]]Is 4 basis vectors, the index of the first set of frequency domain basis vectors of the second layer into the third set of frequency domain basis vectors is [0,1,2,3]M is 4 basis vectors.

It may use a 5-bit bitmap indication or a combined number

And (4) indicating.

Referring to fig. 4, fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention, as shown in fig. 4, including:

a determining module 401, configured to determine a first set of frequency-domain basis vectors for each transmission layer, where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer all belong to a second set of frequency-domain basis vectors;

a feedback module 402 configured to feed back CSI, where the CSI includes information of the first set of frequency-domain basis vectors for each transmission layer.

Optionally, the determining module 401 is configured to determine a first set of frequency-domain basis vectors of each transmission layer from the second set of frequency-domain basis vectors; or

The determining module 402 is configured to determine a third set of frequency-domain basis vectors, and determine a first set of frequency-domain basis vectors of each transmission layer, where the frequency-domain basis vectors in the third set of frequency-domain basis vectors belong to the second set of frequency-domain basis vectors, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors belong to the third set of frequency-domain basis vectors.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the determining the third frequency domain basis vector set includes:

Optionally, the determining a third frequency domain basis vector set according to the basis vector number threshold includes:

and determining the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set.

Optionally, the number of frequency domain basis vectors in the third frequency domain basis vector set is:

the number of frequency domain basis vectors determined by the terminal; or

Optionally, the determining the third frequency domain basis vector set according to the comparison result between the basis vector number threshold and the frequency domain basis vector number of the third frequency domain basis vector set includes:

according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set, selecting the frequency domain basis vectors from the second frequency domain basis vector set as the third frequency domain basis vector set without constraint; or

Selecting adjacent frequency domain basis vectors from the second frequency domain basis vector set as the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set; or

And determining the third frequency domain basis vector set according to the comparison result of the number threshold of the basis vectors and the number of the frequency domain basis vectors of the third frequency domain basis vector set and the corresponding relation between the predefined frequency domain basis vector set and the codebook parameters.

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

It should be noted that, in this embodiment, the terminal 400 may be any implementation manner of the method embodiment in the present invention, and any implementation manner of the terminal in the method embodiment in the present invention may be implemented by the terminal 400 in this embodiment, and achieve the same beneficial effects, which is not described herein again.

Referring to fig. 5, fig. 5 is a structural diagram of a network side device according to an embodiment of the present invention, and as shown in fig. 5, the network side device 500 includes:

a receiving module 501, configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors of each transmission layer, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors of each transmission layer all belong to a second set of frequency-domain basis vectors.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the third set of frequency domain basis vectors includes:

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

It should be noted that, in this embodiment, the network-side device 500 may be a terminal of any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device 500 in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Referring to fig. 6, fig. 6 is a structural diagram of another terminal according to an embodiment of the present invention, and as shown in fig. 6, the terminal includes: a transceiver 610, a memory 620, a processor 600, and a program stored on the memory 620 and executable on the processor 600, wherein:

the processor 600 is configured to determine a first set of frequency-domain basis vectors for each transmission layer, where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer all belong to a second set of frequency-domain basis vectors; and feeding back CSI, wherein the CSI comprises information of the first set of frequency-domain basis vectors for each transmission layer.

The transceiver 610 may be used for receiving and transmitting data under the control of the processor 600.

In FIG. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.

It should be noted that the memory 620 is not limited to be on the terminal, and the memory 620 and the processor 600 may be separated in different geographical locations.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the determining the third set of frequency domain basis vectors includes:

Optionally, determining a third frequency domain basis vector set according to the basis vector number threshold value includes:

the number of frequency domain basis vectors determined by the terminal; or

Optionally, determining the third frequency domain basis vector set according to the comparison result between the threshold of the number of basis vectors and the number of frequency domain basis vectors of the third frequency domain basis vector set includes:

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

It should be noted that, the terminal in this embodiment may be any implementation manner of the method embodiment in the present invention, and any implementation manner of the terminal in the method embodiment in the present invention may be implemented by the terminal in this embodiment, and the same beneficial effects are achieved, and details are not described here again.

Referring to fig. 7, fig. 7 is a structural diagram of another network-side device according to an embodiment of the present invention, and as shown in fig. 7, the network-side device includes: a transceiver 710, a memory 720, a processor 700, and a program stored on the memory 720 and executable on the processor, wherein:

a processor 700 configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors for each transmission layer, and where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer belong to a second set of frequency-domain basis vectors.

The transceiver 710 may be used for receiving and transmitting data under the control of the processor 700.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

It should be noted that the memory 720 is not limited to be on a network-side device, and the memory 720 and the processor 700 may be separated and located in different geographical locations.

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

Optionally, the third set of frequency domain basis vectors includes:

Optionally, the threshold value of the number of basis vectors includes:

one or more basis vector number threshold values.

Optionally, the threshold value of the number of basis vectors is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

It should be noted that, in this embodiment, the network-side device may be a network-side device in any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

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

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the processing method of the information data block according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for reporting CSI (channel State information), is characterized by comprising the following steps:

the terminal feeds back CSI which comprises information of the first frequency domain base vector set of each transmission layer;

the terminal determines a first set of frequency-domain basis vectors for each transmission layer, including:

the terminal determines a third frequency domain basis vector set, and determines a first frequency domain basis vector set of each transmission layer according to the third frequency domain basis vector set, wherein frequency domain basis vectors in the third frequency domain basis vector set belong to the second frequency domain basis vector set, and frequency domain basis vectors in the first frequency domain basis vector set belong to the third frequency domain basis vector set;

the number of frequency domain basis vectors of the third frequency domain basis vector set is less than the number of maximum frequency domain basis vectors, wherein the maximum frequency domain basis vectors are as follows:

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

2. The method of claim 1, wherein the CSI further comprises: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

3. The method of claim 1, wherein the terminal determines a third set of frequency domain basis vectors, comprising:

4. The method as claimed in claim 3, wherein the determining, by the terminal, a third frequency domain basis vector set according to the basis vector number threshold value comprises:

5. The method of claim 4, wherein the number of frequency domain basis vectors of the third set of frequency domain basis vectors is:

the number of frequency domain basis vectors determined by the terminal; or

6. The method as claimed in claim 4, wherein the determining, by the terminal, the third set of frequency domain basis vectors according to the comparison result between the threshold value of the number of basis vectors and the number of frequency domain basis vectors of the third set of frequency domain basis vectors comprises:

7. The method of claim 3, wherein the base vector number threshold value comprises:

one or more basis vector number threshold values.

8. The method of claim 3, wherein the base vector number threshold is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

9. The method of any of claims 1-8, wherein the CSI further comprises: information of a third set of frequency domain basis vectors.

10. The method of claim 9, wherein the information of the third set of frequency domain basis vectors comprises:

11. The method of claim 9, wherein the information of the third set of frequency domain basis vectors comprises one of:

12. The method of any one of claims 1 to 8, wherein the information of the first set of frequency-domain basis vectors comprises:

13. A CSI receiving method, comprising:

the method comprises the steps that network side equipment receives CSI, wherein the CSI comprises information of a first frequency domain base vector set of each transmission layer, and frequency domain base vectors in the first frequency domain base vector set of each transmission layer all belong to a second frequency domain base vector set;

the first set of frequency-domain basis vectors for each transmission layer comprises:

the first frequency domain basis vector set of each transmission layer is respectively determined from a third frequency domain basis vector set, wherein the frequency domain basis vectors in the third frequency domain basis vector set belong to the second frequency domain basis vector set;

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

14. The method of claim 13, wherein the CSI further comprises: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

15. The method of claim 13, wherein the third set of frequency domain basis vectors comprises:

16. The method of claim 15, wherein the base vector number threshold value comprises:

one or more basis vector number threshold values.

17. The method of claim 15, wherein the base vector number threshold is:

a predefined fixed value; or

A predefined function value associated with a codebook parameter; or

A value configured by the network side device.

18. The method of any of claims 13-17, wherein the CSI further comprises: information of a third set of frequency domain basis vectors.

19. The method of claim 18, wherein the information of the third set of frequency domain basis vectors comprises:

20. The method of claim 19, wherein the information of the third set of frequency domain basis vectors comprises one of:

21. A terminal, comprising:

a feedback module, configured to feed back CSI, where the CSI includes information of the first set of frequency-domain basis vectors of each transmission layer;

the determining module is configured to determine a third set of frequency domain basis vectors, and determine a first set of frequency domain basis vectors of each transmission layer according to the third set of frequency domain basis vectors, where frequency domain basis vectors in the third set of frequency domain basis vectors belong to the second set of frequency domain basis vectors, and frequency domain basis vectors in the first set of frequency domain basis vectors belong to the third set of frequency domain basis vectors;

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

22. A network-side device, comprising:

the receiver is configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors of each transmission layer, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors of each transmission layer all belong to a second set of frequency-domain basis vectors;

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

23. A terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to determine a first set of frequency-domain basis vectors for each transmission layer, where the frequency-domain basis vectors in the first set of frequency-domain basis vectors for each transmission layer all belong to a second set of frequency-domain basis vectors; and feeding back CSI, the CSI comprising information of the first set of frequency-domain basis vectors for each transmission layer;

the determining a first set of frequency-domain basis vectors for each transmission layer comprises:

determining a third frequency domain basis vector set, and determining a first frequency domain basis vector set of each transmission layer according to the third frequency domain basis vector set, wherein frequency domain basis vectors in the third frequency domain basis vector set belong to the second frequency domain basis vector set, and frequency domain basis vectors in the first frequency domain basis vector set belong to the third frequency domain basis vector set;

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

24. The terminal of claim 23, wherein the CSI further comprises: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

25. The terminal of claim 23, wherein the terminal determines a third set of frequency domain basis vectors, comprising:

26. The terminal according to any of claims 23 to 25, wherein the CSI further comprises: information of a third set of frequency domain basis vectors.

27. The terminal of claim 26, wherein the information of the third set of frequency domain basis vectors comprises:

28. A network-side device, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to receive CSI, where the CSI includes information of a first set of frequency-domain basis vectors of each transmission layer, and the frequency-domain basis vectors in the first set of frequency-domain basis vectors of each transmission layer all belong to a second set of frequency-domain basis vectors;

a predefined fixed value; or

A value configured by a network side device; or

A predefined function value associated with a codebook parameter.

29. The network-side device of claim 28, wherein the CSI further comprises: and the number of frequency domain basis vectors of the third frequency domain basis vector set.

30. The network-side device of claim 28, wherein the third set of frequency domain basis vectors comprises:

31. The network-side device of any one of claims 28 to 30, wherein the CSI further comprises: information of a third set of frequency domain basis vectors.

32. The network-side device of claim 31, wherein the information of the third set of frequency domain basis vectors comprises:

33. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps in the CSI reporting method according to one of claims 1 to 12, or which, when being executed by a processor, carries out the steps in the CSI receiving method according to one of claims 13 to 20.