CN113438001B

CN113438001B - Channel state information feedback method, receiving method, terminal and network side equipment

Info

Publication number: CN113438001B
Application number: CN202010208069.9A
Authority: CN
Inventors: 郤伟
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2022-08-19
Anticipated expiration: 2040-03-23
Also published as: CN113438001A; WO2021190446A1

Abstract

The invention provides a channel state information feedback method, a receiving method, a terminal and network side equipment. The channel state information feedback method comprises the following steps: determining Q windows according to N tap coefficient vectors, wherein the N tap coefficient vectors are obtained by the first precoding vector through Inverse Discrete Fourier Transform (IDFT); extracting M tap coefficient vectors from a first window of the Q windows; sending a first quantization value to network side equipment, wherein the first quantization value is obtained by quantizing the M tap coefficient vectors; wherein N is an integer greater than 1, and Q and M are both positive integers. The invention can improve the flexibility of selecting M tap coefficient vectors.

Description

Channel state information feedback method, receiving method, terminal and network side equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a channel state information feedback method, a channel state information receiving method, a terminal and network side equipment.

Background

Channel State Information (CSI) is critical to channel capacity. For a multi-antenna system, in order to enable a network to acquire spatial domain CSI, a Precoding Matrix Indicator (PMI) is generally required to be fed back, and a set of vectors or matrices corresponding to the PMI is called a Codebook (Codebook).

In order to further reduce the feedback overhead, the enhanced type II codebook and the enhanced type II port selection codebook introduce frequency domain compression, which specifically includes the following processes: the target vector is first converted to the time domain by an Inverse DFT (Inverse DFT, IDFT), resulting in N ₃ A plurality of tap coefficient vectors; using sparsity in the time domain, from N ₃ Selecting M from each tap coefficient vector _v The strongest tap coefficient vectors; will M _v The strongest tap coefficients are vector quantized and fed back to the network.

At present, in N ₃ At > 19, from a length of 2M _v Selects M from the window _v A tap coefficient vector, the window including N ₃ 2M in each tap coefficient vector _v A number of successive tap coefficient vectors. It can be seen that when N is ₃ At > 19, M _υ The tap coefficient vectors are limited to a length of 2M _υ In the window (c), the selection flexibility is low.

Disclosure of Invention

The embodiment of the invention provides a channel state information feedback method, a channel state information receiving method, a terminal and network side equipment, and aims to solve the problem that the existing M is high in the prior art _v The flexibility of the selection of the individual tap coefficient vectors is low.

In order to solve the problems, the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a channel state information feedback method, which is applied to a terminal, and the method includes:

determining Q windows according to N tap coefficient vectors, wherein the N tap coefficient vectors are obtained by the first precoding vector through Inverse Discrete Fourier Transform (IDFT);

extracting M tap coefficient vectors from a first window of the Q windows;

sending a first quantization value to a network side device, wherein the first quantization value is obtained by quantizing the M tap coefficient vectors;

wherein N is an integer greater than 1, and Q and M are both positive integers.

In a second aspect, an embodiment of the present invention provides a method for receiving channel state information, where the method is applied to a network side device, and the method includes:

receiving a first quantization value sent by a terminal, wherein the first quantization value is obtained by quantizing M tap coefficient vectors by the terminal, and the M tap coefficient vectors are extracted from a first window of Q windows corresponding to a first precoding vector by the terminal;

generating a second pre-coding vector corresponding to the first pre-coding vector according to the first quantization value;

wherein Q and M are both positive integers.

In a third aspect, an embodiment of the present invention further provides a terminal, where the terminal includes:

the determining module is used for determining Q windows according to N tap coefficient vectors, wherein the N tap coefficient vectors are obtained by the first precoding vector through Inverse Discrete Fourier Transform (IDFT);

a decimation module for decimating M tap coefficient vectors from a first window of said Q windows;

a first sending module, configured to send a first quantized value to a network side device, where the first quantized value is obtained by quantizing the M tap coefficient vectors;

wherein N is an integer greater than 1, and Q and M are both positive integers.

In a fourth aspect, an embodiment of the present invention further provides a network side device, where the network side device includes:

a first receiving module, configured to receive a first quantized value sent by a terminal, where the first quantized value is obtained by quantizing M tap coefficient vectors by the terminal, and the M tap coefficient vectors are extracted by the terminal from a first window of Q windows corresponding to a first precoding vector;

a generating module, configured to generate a second precoding vector corresponding to the first precoding vector according to the first quantization value;

wherein Q and M are both positive integers.

In a fifth aspect, an embodiment of the present invention further provides a terminal, where the terminal includes a processor, a memory, and a computer program stored in the memory and operable on the processor, and when the computer program is executed by the processor, the terminal implements the steps of the channel state information feedback method as described above.

In a sixth aspect, an embodiment of the present invention further provides a network-side device, where the network-side device includes a processor, a memory, and a computer program stored in the memory and being executable on the processor, and the computer program, when executed by the processor, implements the steps of the channel state information receiving method described above.

In a seventh aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements the steps of the channel state information feedback method applied to a terminal or the steps of the channel state information receiving method applied to a network side device, as described above.

In the embodiment of the present invention, after obtaining N tap coefficients obtained by performing IDFT on a first precoding vector, a terminal may determine Q windows according to the N tap coefficients, and may further extract M tap coefficient vectors from a first window of the Q windows, and quantize and feed back the M tap coefficient vectors to a network side device. Therefore, compared with the prior art in which the M tap coefficient vectors come from one window, the embodiment of the invention can improve the flexibility of selecting the M tap coefficient vectors.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1a is a diagram of a DFT matrix provided by an embodiment of the invention;

FIG. 1b is a schematic diagram of N tap coefficient vectors provided by an embodiment of the present invention;

fig. 2 is a flowchart of a channel state information feedback method according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for receiving channel state information according to an embodiment of the present invention;

fig. 4 is one of the structural diagrams of a terminal provided in the embodiment of the present invention;

fig. 5 is one of the structural diagrams of the network side device according to the embodiment of the present invention;

fig. 6 is a second structural diagram of a terminal according to an embodiment of the present invention;

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

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Further, as used herein, "and/or" means at least one of the connected objects, e.g., a and/or B and/or C, means 7 cases including a alone, B alone, C alone, and both a and B present, B and C present, both a and C present, and A, B and C present.

For convenience of understanding, some contents related to the embodiments of the present invention are explained below:

channel State Information (CSI) is critical to channel capacity. Especially for a multi-antenna system, the transmitting end can optimize the transmission of signals according to the CSI, so that the signals can be more matched with the state of the channel. Such as: a Channel Quality Indicator (CQI) may be used to select an appropriate Modulation and Coding Scheme (MCS) to implement link adaptation; a Precoding Matrix Indicator (PMI) may be used to implement Eigen-Beamforming (Eigen-Beamforming) to maximize the strength of a received signal, or to suppress interference, such as inter-cell interference, inter-user interference, or the like. Therefore, since a Multi-antenna technology (MIMO) has been proposed, CSI acquisition has been a research focus.

Generally, CSI acquisition is mainly divided into two ways: one is explicit feedback, such as feedback of CQI, PMI, etc.; the other is implicit feedback, such as using channel Reciprocity (reliability). In a Time Division Duplex (TDD) system, an implicit feedback scheme is generally used due to the existence of better channel reciprocity; in Frequency Division Duplex (FDD) systems, channel reciprocity is poor, and an explicit feedback scheme is generally used. For a multi-antenna system, in order for the network to acquire spatial domain CSI, it is generally necessary to feed back the PMI. And the set of vectors or matrices to which the PMI corresponds is called a Codebook (Codebook).

In the fifth generation (5) ^th Generation) New air interface (NR) systems support three codebooks: a Type I (Type I) codebook, a Type II (Type II) codebook, and a Type II Port Selection (Type II Port Selection) codebook. In order to further reduce feedback overhead, frequency domain compression is also introduced into a Type II codebook and a Type II Port Selection codebook in the NR system, which are respectively referred to as an enhanced Type II (enhanced Type II) codebook and an enhanced Type II Port Selection (enhanced Type II Port Selection) codebook.

Type II codebook

The basic principle of the type II codebook is to spread a target vector (e.g., a precoding vector) in an orthonormal basis, i.e., to represent the target vector by a linear combination of vectors in the orthonormal basis. Therefore, the terminal needs to report the orthogonal base indication and the projection coefficients of the target vector on each vector in the orthogonal base to the network. Of course, the projection coefficients need to be quantized before reporting. In order to reduce the overhead, the projection component corresponding to the projection coefficient with smaller amplitude can be ignored, i.e. the incomplete orthogonal basis is adopted. In order to make the distribution of the projection coefficients more concentrated, i.e. to maximize the variance of the projection coefficients. The orthogonal base with the largest projection coefficient variance needs to be selected as the projection orthogonal base in the candidate orthogonal base set. In the 5G NR system, the orthogonal basis set is obtained by oversampling with a Discrete Fourier Transform (DFT) vector.

Assuming that the dimensions of the base station side antenna array are N respectively ₁ And N ₂ Corresponding over-production factors are respectively O ₁ And O ₂ Then:

channel State information reference Signal (Channel State info)Information Reference Signal, CSI-RS) number of ports P _CSI-RS Comprises the following steps: p _CSI-RS ＝2N ₁ N ₂ ；

It is assumed that the precoding vector (target vector) of the l layer (layer) on the s subband (subband) can be represented as

Wherein:

s is the number of subbands.

Is the incomplete orthogonal basis selected from the group consisting of L e {2, 3, 4]A vector, where the value of L is configured by Radio Resource Control (RRC) parameters. The indication of B includes two parts:

complete orthogonal basis indication: i all right angle _1，1 ＝[q ₁ q ₂ ](ii) a Wherein q is _i ∈{0，1，...，O _i -1}，i＝1，2；

Incomplete orthogonal basis indication: i.e. i _1，2 。

c _l，s，r Is the target vector (w) _l，s ) The projection coefficient of the subvector corresponding to the r-th polarization direction on the selected incomplete orthogonal basis B has a length L, r being 1, 2.

In particular, c _l，s，r The indications of (a) include the following:

the strongest amplitude indicates: i.e. i _1，3，l ；

Broadband amplitude indication: i all right angle _1，4，l ；

Subband magnitude indication: i all right angle _2，2，l ；

Subband phase indication: i.e. i _2，1，l 。

Type II port selection codebook

The type II port selection codebook is very similar to the type II codebook, with the main difference being the selection of the incomplete orthogonal basis. As mentioned above, in the type II codebook, the incomplete orthogonal basis is a partial column of a complete DFT orthogonal basis; whereas in the type II port selection codebook, the incomplete orthogonal basis is a partial column of one unit array.

In addition, in the type II port selection codebook, CSI-RS is usually precoded. But the operation is completely transparent to the terminal. Therefore, the channel matrix seen by the terminal through the CSI-RS is actually the product of the physical channel and the precoding matrix.

Enhanced type II codebook and enhanced type II port selection codebook

In the NR system, PMI is based on subband feedback. Therefore, the feedback overhead is closely related to the number of subbands. To further reduce feedback overhead, frequency domain compression is introduced in the enhanced type II codebook and the enhanced type II port selection codebook. Taking the ith layer as an example, the method specifically comprises the following steps:

target vectors (denoted as w) on respective frequency domain subbands _l，κ ，κ＝1,2，...，N ₃ ) First converted to the time domain by an Inverse DFT (Inverse DFT, IDFT). Wherein, the IDFT point number N ₃ And each subband has R ∈ {1, 2} frequency domain PMIs, and the value of R is configured by RRC signaling.

Then, M is selected by utilizing the sparsity of the time domain _v The strongest tap coefficient vector, as shown by the following equation:

wherein for the enhanced type II codebook, B is represented by i _1，1 And i _1，2 Indication; for enhanced type II port selection codebooks, B is represented by i _1，1 And (4) indicating. W _DFT To correspond to the selected M _v A submatrix of DFT vectors of the tap coefficient vectors, the size of which is N ₃ ×M _v 。W _DFT Not only information on the number of taps (W) _DFT Number of columns) andwith specific time domain tap position information (W) _DFT Column vector of (d).

Wherein p is _v Is configured by RRC signaling, v is rank.

A tap coefficient vector c _l，t，r Quantized and fed back to the network with tap index t 1, 2 _v The polarization direction index r is 1, 2. The tap coefficient vector indication comprises i _1，7，l 、i _1，8，l 、i _2，4，l 、i _2，5，l 。

Tap coefficient is selected from W _DFT And (4) indicating. FIG. 1a shows a size N ₃ ×N ₃ DFT matrix (note as

) The n +1 th column is denoted as W _n ，n＝0，1，...，N _3-1 (ii) a Fig. 1b shows the time-domain tap coefficient vector (denoted as h (n)) after IDFT. Each column vector in fig. 1a corresponds to one tap in fig. 1 b. For example, the first column vector w ₀ Second column vector w for taps with time delay of 0 ₁ Corresponding to the tap with the time delay of 1, and so on.

The following describes a channel state information feedback method according to an embodiment of the present invention.

It should be noted that the N tap coefficient vectors in the embodiment of the present invention represent the aforementioned N ₃ A plurality of tap coefficient vectors, M tap coefficient vectors representing the M _v The first precoding vector may represent the aforementioned target vector.

Referring to fig. 2, fig. 2 is a flowchart of a channel state information feedback method according to an embodiment of the present invention. The channel state information feedback method of the embodiment of the invention is applied to the terminal. A terminal may also be referred to as a User Equipment (UE). In practical applications, the terminal may be a Mobile phone, 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), or a vehicle-mounted Device.

As shown in fig. 2, the channel state information feedback method may include the steps of:

step 201, determining Q windows according to N tap coefficient vectors, where the N tap coefficient vectors are obtained by performing Inverse Discrete Fourier Transform (IDFT) on a first precoding vector.

Wherein N is an integer greater than 1, and Q is a positive integer.

Optionally, the length of each of the Q windows may be agreed by a protocol or configured by a network side device.

When the length of each of the Q windows is configured by the network side device, the network side device may configure the length of each of the Q windows through first information, where the first information may be any one of: downlink Control Information (DCI), RRC, Media Access Control (MAC) Control Element (CE), and the like.

It should be understood that the window length may also be reconfigured by the network side device after being agreed upon by the protocol or configured by the network side device. In the case where the window length is y, the window includes y tap coefficient vectors whose positions are consecutive.

For example, assume that the protocol promises a window length of 1, i.e., the window includes 1 tap coefficient vector; the terminal receives the first information sent by the network side equipment at a first time, and the window length configured by the first information is 4, that is, the window comprises 4 tap coefficient vectors. Then, the window determined by the terminal before the first time includes 1 number of tap coefficient vectors, and the window determined after the first time includes 4 number of tap coefficient vectors.

Step 202, extracting M tap coefficient vectors from a first window of the Q windows.

In this embodiment, when Q is equal to 1, the first window is a window determined by the terminal according to the N tap coefficient vectors, and the terminal extracts M tap coefficient vectors from the window.

In the case where Q > 1, the first window may include a part or all of the Q windows. Such as: in case Q is greater than M, the terminal may extract the M tap coefficient vectors from a partial window of the Q windows; in the case that Q is less than or equal to M, the terminal may extract the M tap coefficient vectors from all or a portion of the Q windows, but is not limited thereto. The Q windows may be considered candidate windows and the first window may be considered a final window.

In specific implementation, after determining Q candidate windows, the terminal determines a final window, that is, a first window, from the Q candidate windows, and then extracts M tap coefficient vectors from the final window.

Step 203, sending a first quantization value to a network side device, where the first quantization value is obtained by quantizing the M tap coefficient vectors.

In the channel state information feedback method of this embodiment, after obtaining N tap coefficients obtained by performing Inverse Discrete Fourier Transform (IDFT) on a first precoding vector, a terminal may determine Q windows according to the N tap coefficients, and may further extract M tap coefficient vectors from a first window of the Q windows, and feed back the M tap coefficient vectors after quantization to a network side device. Therefore, compared with the prior art that the M tap coefficient vectors come from one window, the embodiment of the invention can improve the flexibility of the selection of the M tap coefficient vectors.

The determination of the Q windows described in the embodiments of the present invention is explained below.

Optionally, the determining Q windows according to the N tap coefficient vectors includes:

determining Q first tap coefficient vectors of the N tap coefficient vectors;

and determining Q windows according to the Q first tap coefficient vectors, wherein each first tap coefficient vector is used for determining one window.

In this optional embodiment, in order to determine Q windows, the terminal may first determine Q first tap coefficient vectors, and then determine a window by using each first tap coefficient vector, to obtain Q windows.

Optionally, an ith first tap coefficient vector of the Q first tap coefficient vectors satisfies at least one of:

a first condition: the tap amplitude of the ith first tap coefficient vector is greater than the tap amplitude of the second tap coefficient vector, and the ith first tap coefficient vector is separated from the second tap coefficient vector by one tap position;

the second condition is that: the tap amplitude of the ith first tap coefficient vector is greater than a first value;

wherein the value range of i is 1 to Q.

And when the ith first tap coefficient vector meets the first condition, the ith first tap coefficient vector is indicated as a maximum value point, and the ith first tap coefficient vector is stronger.

The first value in the second condition may be used to measure the strength of the tap coefficient vector, and if the tap amplitude of the tap coefficient vector is greater than the first value, it indicates that the tap coefficient vector is stronger; if the tap amplitude of the tap coefficient vector is less than or equal to the first value, the tap coefficient vector is weak. Optionally, the first value may be predetermined by a protocol or configured by a network side device, and a specific value of the first value is determined according to an actual situation, which is not limited specifically. Therefore, in the case where the ith first tap coefficient vector satisfies the second condition, it is indicated that the ith first tap coefficient vector is strong.

In this way, the window determined according to the ith first tap coefficient vector may include a stronger tap, and it may be further ensured that the extracted M tap coefficient vectors are stronger.

Optionally, the determining Q windows according to the Q first tap coefficient vectors may include:

taking the tap position of the ith first tap coefficient vector in the Q first tap coefficient vectors as the first position of a window, and determining the window corresponding to the ith first tap coefficient vector;

wherein the first position is a starting position, a central position or an ending position; the value of i ranges from 1 to Q.

In a specific implementation, the terminal may determine, by combining the first position and the window length, a window corresponding to the ith first tap coefficient vector.

For ease of understanding, the examples are illustrated below:

example one, assume that the N tap coefficient vectors include tap coefficient vector 1, tap coefficient vector 2, tap coefficient vector 3, tap coefficient vector 4, and tap coefficient vector 5; the ith first tap coefficient vector is a tap coefficient vector 4; the window length is 3.

And if the first position is the starting position of the window, the window corresponding to the ith first tap coefficient vector comprises a tap coefficient vector 4, a tap coefficient vector 5 and a tap coefficient vector 1.

If the first position is the center position of the window, the window corresponding to the ith first tap coefficient vector comprises a tap coefficient vector 3, a tap coefficient vector 4 and a tap coefficient vector 5.

And if the first position is the end position of the window, the window corresponding to the ith first tap coefficient vector comprises a tap coefficient vector 2, a tap coefficient vector 3 and a tap coefficient vector 4.

Example two, please refer to fig. 1b again. Assuming that said Q first tap coefficient vectors satisfy said first condition, two first tap coefficient vectors can be found in fig. 1b, respectively: a tap coefficient vector with time delay of 1 and a tap coefficient vector with time delay of t.

Assuming that the first position is the center position of the window and the window length is 3, the first candidate window comprises tap coefficient vectors with time delays of 0, 1 and 2; the second candidate window comprises a vector of tap coefficients with time delays t-1, t and t + 1.

The first window in the embodiment of the present invention is explained below.

Optionally, the first window satisfies at least one of the following:

in the case that Q is less than or equal to P, the first window comprises the Q windows;

under the condition that Q is larger than P, the first window comprises P windows determined from the Q windows;

where P is the number of windows desired for extracting the M tap coefficient vectors, e.g., P is the desired number of the first windows.

Optionally, the value of P may be agreed by a protocol or configured by a network side device.

Under the condition that the value of P is configured by the network side device, the network side device may configure the value of P through second information, where the second information may be any one of the following: downlink Control Information (DCI), RRC, Media Access Control (MAC) Control Element (CE), and the like.

It should be understood that the value of P may also be reconfigured by the network side device after being agreed by the protocol or configured by the network side device.

For example, assume that the value of the protocol convention P is 4, that is, the final window includes 4 windows; and the terminal receives the second information sent by the network side equipment at a second moment, and the value of P configured by the second information is 3, namely the final window comprises 3 windows. The number of windows determined by the terminal from the candidate windows before the second time instant is 4 and the number of windows determined from the candidate windows after the second time instant is 3.

The determination of the first window for the case one, where Q ≦ P, and the case two, where Q > P, will be described below, respectively.

For the first case, the first window includes the Q windows, that is, the terminal may take all candidate windows as the final window. In a specific implementation, the number of windows included in the first window may be equal to Q.

For the second case, the first window includes P windows determined from the Q windows, that is, the terminal may select P candidate windows from the candidate windows as a final window, that is, the first window.

Optionally, the first window includes: the first P windows of the Q windows are sorted from large to small according to a second value;

wherein the second value is any one of:

the maximum value of the amplitudes of all tap coefficient vectors in the window;

the average value of the amplitudes of all tap coefficient vectors in the window;

the power average of all tap coefficient vectors within the window.

It should be noted that the second value is merely an example, and the second value is not limited thereto.

The second value of the window may be used to measure the strength of the tap coefficient vector included in the window. If the second value of a certain window is larger, the tap coefficient vector included in the window is stronger; if the second value of a certain window is smaller, it indicates that the tap coefficient vector included in the window is weaker.

Therefore, under the condition that Q is larger than P, the terminal can further select a stronger window from the candidate windows, so that M extracted tap coefficient vectors are stronger, and the accuracy of CSI is improved.

The extraction of the M tap coefficient vectors in the embodiment of the present invention is described below.

Optionally, the number of the first windows is less than or equal to M, and the terminal may extract at least one tap coefficient vector from each of the first windows to obtain the M tap coefficient vectors.

When the terminal extracts the tap coefficient vector from each of the first windows, the tap coefficient vectors may be sequentially extracted in the order of magnitude of the tap coefficient vector from large to small. Such as: assuming that the terminal determines to extract two tap coefficient vectors from the window 1 and one tap coefficient vector from the window 2, the two tap coefficient vectors extracted from the window 1 by the terminal may be the first largest and the second largest tap coefficient vectors in the window 1, and the tap coefficient vector extracted from the window b may be the tap coefficient vector with the largest tap amplitude in the window 2. Therefore, the M extracted tap coefficient vectors can be ensured to be stronger, the feedback precision of the CSI is improved, the accuracy of the precoding vector calculated by the network side equipment based on the first quantization value is further improved, and the throughput of downlink transmission is improved.

In addition, the tap coefficient vectors extracted by the terminal from each of the first windows may be equal or unequal, which is described in detail below.

For convenience of description, it is noted that the first window includes a number of windows H.

Optionally, if M is an integer multiple of H, the tap coefficient vectors extracted by the terminal from each of the first windows may be equal; if M is not an integer multiple of H, the tap coefficient vectors extracted by the terminal from each of the first windows may not be equal.

For example, if H is 2 and M is 4, the terminal may extract 2 tap coefficient vectors from each of the first windows. If H is 2 and M is 3, the terminal may extract 1 tap coefficient vector from one window of the first window and 2 tap coefficient vectors from the other window.

Further, in the case where M is not an integer multiple of H, such as k × H ≦ M < (k +1) × H, k being a positive integer less than y, y being the window length, the terminal may extract k tap coefficient vectors from each of the final windows and 1 more tap coefficient vectors from each of third windows in the final windows, the third windows including (M-k × H) windows.

Optionally, the third window includes: the first (M-k multiplied by H) windows of the Q windows when the Q windows are sorted from large to small according to a second value;

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

Therefore, the terminal can further extract more tap coefficient vectors from a stronger window, so that the extracted M tap coefficient vectors can be ensured to be stronger, and the accuracy of the CSI can be improved.

In this embodiment of the present invention, optionally, after extracting M tap coefficient vectors from the first window of the Q windows, the method further includes:

sending window position information of a first window to the network side equipment;

wherein the window position information is used to indicate a position of the first window.

Optionally, the window position information includes at least one of: window starting point position, window center position, window end point position.

The window position information of the first window is used to determine the position of each window in the first window, and further determine the positions of the M tap coefficient vectors.

After receiving the window position information of the first window, the network side device may generate second tap coefficient vectors corresponding to the N tap coefficient vectors, and then generate a second precoding vector corresponding to the first precoding vector according to the second tap coefficient vector. The second tap coefficient vector differs from the N tap coefficient vectors in that: the magnitudes of the tap coefficient vectors other than the M tap coefficient vectors in the second tap coefficient vector are 0. Therefore, the accuracy of the precoding vector calculation of the network side equipment can be improved, and the throughput of downlink transmission is improved.

In specific implementation, the terminal may send window position information of a first window to the network side device through a first channel, where the first channel may be at least one of the following: a Physical Uplink Shared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH).

It should be noted that the channel state information feedback method according to the embodiment of the present invention may be applied to an enhanced type II codebook and an enhanced type II port selection codebook.

In one mode, the inventionExample channel state information feedback method M _v Decimation of individual tap coefficient vectors may be applied to N ₃ Is arbitrarily chosen, i.e. no matter N ₃ The terminal can extract M from Q windows _v A vector of tap coefficients.

In another way, M in the channel state information feedback method according to the embodiment of the present invention _v Decimation of individual tap coefficient vectors may be applied to N ₃ In the case of > 19, i.e. in N ₃ When the number is less than or equal to 19, the terminal can directly receive the data from N ₃ Extracting M with maximum intensity from each tap coefficient vector _v A plurality of tap coefficient vectors; in N ₃ When the window is more than 19, the terminal extracts M from Q windows _v A vector of tap coefficients.

Referring to fig. 3, fig. 3 is a flowchart of a channel state information feedback method according to an embodiment of the present invention. The channel state information receiving method of the embodiment of the invention is applied to network side equipment. The network side device may be a base station, a relay, an access point, or the like.

As shown in fig. 3, the channel state information receiving method may include the steps of:

step 301, receiving a first quantization value sent by a terminal, where the first quantization value is obtained by quantizing M tap coefficient vectors by the terminal, and the M tap coefficient vectors are extracted from a first window of Q windows corresponding to a first precoding vector by the terminal.

The Q windows corresponding to the first precoding vector may specifically be determined according to N tap coefficient vectors, where the N tap coefficient vectors are obtained by performing Inverse Discrete Fourier Transform (IDFT) on the first precoding vector, and N is an integer greater than 1.

Step 302, generating a second precoding vector corresponding to the first precoding vector according to the first quantization value;

wherein Q and M are positive integers.

In the channel state information receiving method of this embodiment, the network side device generates the second precoding vector corresponding to the first precoding vector based on the first quantization value, so that the accuracy of calculating the precoding vector by the network side device can be improved, and the throughput of downlink transmission can be improved.

Optionally, the first window satisfies at least one of:

under the condition that Q is larger than P, the first window comprises P windows determined from the Q windows, and P is a positive integer smaller than Q;

wherein P is a desired number of the first windows.

Optionally, before receiving the first quantized value sent by the terminal, the method further includes:

and sending first configuration information to the terminal, wherein the first configuration information is used for configuring the value of the P.

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

and sending first configuration information to the terminal, wherein the first configuration information is used for configuring the length of each window in the Q windows.

Optionally, before generating a second precoding vector corresponding to the first precoding vector according to the first quantization value, the method further includes:

receiving window position information of a first window sent by the terminal, wherein the window position information is used for indicating the position of the first window;

the generating a second precoding vector corresponding to the first precoding vector according to the first quantization value includes:

and generating a second precoding vector corresponding to the first precoding vector according to the first quantization value and the window position information of the first window.

Optionally, the window position information includes at least one of: the window starting point position, the window center position and the window end point position.

It should be noted that, the present embodiment is implemented as a network side device corresponding to the foregoing method embodiment, and therefore, reference may be made to the relevant description in the foregoing method embodiment, and the same beneficial effects may be achieved. To avoid repetition of the description, the description is omitted.

The various optional implementations described in the embodiments of the present invention may be implemented in combination with each other or implemented separately without conflict, and the embodiments of the present invention are not limited thereto.

For ease of understanding, examples are illustrated below:

according to the time domain tap coefficient (h (N), N is 0, 1 _3-1 ) Determining a plurality of window positions (number of windows N) _w This value is preset by the protocol or configured by the network, as previously described). All local maximum points (the first derivative is zero and the second derivative is less than zero) are found as a candidate window set, and then a window with the maximum intensity is selected from the candidate set.

The method specifically comprises the following two steps:

determining a candidate window: go through h (N), N ═ 0, 1 _3-1 . When the tap position N satisfies at least one of the following conditions, the tap position N is used as the starting position or the central position of a candidate window, and the number of the candidate windows is recorded as N _w，c ：

|h(n-1)|≤|h(n)|≥|h(n+1)|；

And | h (n) | ≧ T, and the positive rational number T is a threshold preset by the protocol or configured by the network.

Determining a final window:

when N is present _w，c ≤N _w All candidate windows are taken as final windows.

When N is present _w，c ＞N _w When N is selected _w And taking the window with the maximum window attribute as a final window. The window attribute may be, but is not limited to, one of the following:

maximum amplitude of all taps in the window;

the amplitude average of all taps within the window;

the average of the power (average of the squared magnitude) of all taps within the window.

Taking fig. 1b as an example, two tap positions can be found according to the above method, which are: the tap coefficient vector with time delay of 1 and the tap coefficient vector with time delay of t respectively correspond to two candidate windows, namely N _w，c 2. If two taps are found as the center of the window and the window length is 3, the first candidate window comprises tap coefficient vectors with time delays of 0, 1 and 2; the second candidate window comprises a vector of tap coefficients with time delays t-1, t and t + 1. If the number of windows of the network configuration is also 2 (N) _w 2), then the taps within both candidate windows (6 taps in total) are quantized and fed back to the network.

The terminal selects time-domain tap coefficients in a plurality of windows. Specifically, the method comprises the following steps:

number of windows (N) _w ) And length is preset by the protocol or configured by the network. When configured by the network, at least one of signaling such as Downlink Control Information (DCI), RRC, and Media Access Control (MAC) Control Element (CE) may be used. In particular, the window length and/or number is defaulted before the network is configured or reconfigured. For example, the default value for the window length is 1 and the default value for the number of windows is 4.

And the window position information is fed back to the network by the terminal. The window position information may be at least one of a window start position or a window center position. The feedback channel may be at least one of a Physical Uplink Shared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH).

The invention introduces multi-window tap coefficient feedback on the basis of an enhanced type II codebook and an enhanced type II port selection codebook. Specifically, the main innovation points and protection points of the present invention mainly include the following aspects: the terminal reports the tap coefficients within a plurality of windows to the network. A method for a terminal to determine a plurality of window positions. By introducing multi-window feedback, the network can obtain more accurate CSI, especially under the condition that the multipath delay spread of the channel is large. The scheme can optimize the design of a precoding matrix or vector of downlink data transmission, and greatly improve the throughput of downlink transmission.

Referring to fig. 4, fig. 4 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention. As shown in fig. 4, the terminal 400 includes:

a determining module 401, configured to determine Q windows according to N tap coefficient vectors, where the N tap coefficient vectors are obtained by performing Inverse Discrete Fourier Transform (IDFT) on a first precoding vector;

a decimation module 402 for decimating M tap coefficient vectors from a first window of the Q windows;

a first sending module 403, configured to send a first quantized value to a network side device, where the first quantized value is obtained by quantizing the M tap coefficient vectors;

wherein N is an integer greater than 1, and Q and M are both positive integers.

Optionally, the determining module 401 includes:

a first determining unit configured to determine Q first tap coefficient vectors of the N tap coefficient vectors;

a second determining unit, configured to determine Q windows according to the Q first tap coefficient vectors, where each first tap coefficient vector is used to determine one window.

Optionally, an ith first tap coefficient vector of the Q first tap coefficient vectors satisfies at least one of the following conditions:

the tap amplitude of the ith first tap coefficient vector is greater than that of the second tap coefficient vector, and the ith first tap coefficient vector and the second tap coefficient vector are separated by one tap position;

the tap magnitude of the ith first tap coefficient vector is greater than a first value;

wherein the value range of i is 1 to Q.

Optionally, the second determining unit is specifically configured to:

Optionally, the extracting module 402 includes:

a third determination unit, the first window satisfying at least one of:

wherein P is a desired number of the first windows.

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

Optionally, the value of P is agreed by a protocol or configured by a network side device.

Optionally, the length of each of the Q windows is agreed by a protocol or configured by a network side device.

Optionally, the terminal 400 further includes:

a second sending module, configured to send window position information of a first window to the network side device after extracting M tap coefficient vectors from the first window of the Q windows;

The terminal 400 can implement each process that the terminal can implement in the method embodiment of the present invention, and achieve the same beneficial effects, and for avoiding repetition, details are not described here.

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

a first receiving module 501, configured to receive a first quantized value sent by a terminal, where the first quantized value is obtained by quantizing M tap coefficient vectors, where the M tap coefficient vectors are extracted from a first window of Q windows corresponding to a first precoding vector by the terminal;

a generating module 502, configured to generate a second precoding vector corresponding to the first precoding vector according to the first quantization value;

wherein Q and M are positive integers.

Optionally, the first window satisfies at least one of:

when Q is larger than P, the first window comprises P windows determined from the Q windows, and P is a positive integer smaller than Q;

wherein P is a desired number of the first windows.

Optionally, the network device 500 further includes:

a third sending module, configured to send first configuration information to a terminal before receiving a first quantized value sent by the terminal, where the first configuration information is used to configure a value of P.

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

Optionally, the network device 500 further includes:

a fourth sending module, configured to send first configuration information to a terminal before receiving a first quantization value sent by the terminal, where the first configuration information is used to configure a length of each window in the Q windows.

Optionally, the network device 500 further includes:

a second receiving module, configured to receive window position information of a first window sent by the terminal, where the window position information is used to indicate a position of the first window;

the generating module 502 is specifically configured to:

The network side device 500 can implement each process that the network side device can implement in the method embodiment of the present invention, and achieve the same beneficial effects, and for avoiding repetition, the details are not described here again.

Referring to fig. 6, fig. 6 is a second structural diagram of a terminal according to a second embodiment of the present invention, where the terminal may be a hardware structural diagram of a terminal for implementing various embodiments of the present invention. As shown in fig. 6, terminal 600 includes, but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, a processor 610, and a power supply 611. Those skilled in the art will appreciate that the terminal configuration shown in fig. 6 is not intended to be limiting, and that the terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

Wherein, the processor 610 is configured to: determining Q windows according to N tap coefficient vectors, wherein the N tap coefficient vectors are obtained by a first pre-coding vector through Inverse Discrete Fourier Transform (IDFT); extracting M tap coefficient vectors from a first window of the Q windows; a radio frequency unit 601, configured to: sending a first quantization value to a network side device, wherein the first quantization value is obtained by quantizing the M tap coefficient vectors; wherein N is an integer greater than 1, and Q and M are both positive integers.

Optionally, the processor 610 is further configured to:

determining Q first tap coefficient vectors of the N tap coefficient vectors;

the tap amplitude of the ith first tap coefficient vector is greater than a first value;

wherein the value range of i is 1 to Q.

Optionally, the processor 610 is further configured to:

Optionally, the first window satisfies at least one of:

wherein P is a desired number of the first windows.

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

Optionally, the radio frequency unit 601 is further configured to:

It should be noted that, in this embodiment, the terminal 600 may implement each process in the method embodiment of the present invention and achieve the same beneficial effects, and for avoiding repetition, details are not described here.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 601 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 610; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 601 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio frequency unit 601 may also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 602, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 603 may convert audio data received by the radio frequency unit 601 or the network module 602 or stored in the memory 609 into an audio signal and output as sound. Also, the audio output unit 603 can also provide audio output related to a specific function performed by the terminal 600 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 603 includes a speaker, a buzzer, a receiver, and the like.

The input unit 604 is used to receive audio or video signals. The input Unit 604 may include a Graphics Processing Unit (GPU) 6041 and a microphone 6042, and the Graphics processor 6041 processes image data of a still picture or video obtained by an image capturing apparatus (such as a camera) in a video capture mode or an image capture mode. The processed image frames may be displayed on the display unit 606. The image frames processed by the graphic processor 6041 may be stored in the memory 609 (or other storage medium) or transmitted via the radio frequency unit 601 or the network module 602. The microphone 6042 can receive sound, and can process such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 601 in case of the phone call mode.

The terminal 600 also includes at least one sensor 605, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 6061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 6061 and/or the backlight when the terminal 600 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 605 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 606 is used to display information input by the user or information provided to the user. The Display unit 606 may include a Display panel 6061, and the Display panel 6061 may be configured by a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 607 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 607 includes a touch panel 6071 and other input devices 6072. Touch panel 6071, also referred to as a touch screen, may collect touch operations by a user on or near it (e.g., operations by a user on or near touch panel 6071 using a finger, stylus, or any other suitable object or attachment). The touch panel 6071 may include two portions of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 610, receives a command from the processor 610, and executes the command. In addition, the touch panel 6071 can be implemented by various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 607 may include other input devices 6072 in addition to the touch panel 6071. Specifically, the other input devices 6072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, and a joystick, which are not described herein again.

Further, the touch panel 6071 can be overlaid on the display panel 6061, and when the touch panel 6071 detects a touch operation on or near the touch panel 6071, the touch operation is transmitted to the processor 610 to determine the type of the touch event, and then the processor 610 provides a corresponding visual output on the display panel 6061 according to the type of the touch event. Although in fig. 6, the touch panel 6071 and the display panel 6061 are two independent components to realize the input and output functions of the terminal, in some embodiments, the touch panel 6071 and the display panel 6061 may be integrated to realize the input and output functions of the terminal, and this is not limited here.

The interface unit 608 is an interface for connecting an external device to the terminal 600. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 608 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 600 or may be used to transmit data between the terminal 600 and an external device.

The memory 609 may be used to store software programs as well as various data. The memory 609 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, etc. Further, the memory 609 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 610 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 609 and calling data stored in the memory 609, thereby performing overall monitoring of the terminal. Processor 610 may include one or more processing units; preferably, the processor 610 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 610.

The terminal 600 may further include a power supply 611 (e.g., a battery) for supplying power to the various components, and preferably, the power supply 611 is logically connected to the processor 610 via a power management system, so that functions of managing charging, discharging, and power consumption are performed via the power management system.

In addition, the terminal 600 includes some functional modules that are not shown, and are not described in detail herein.

Preferably, an embodiment of the present invention further provides a terminal, which includes a processor 610, a memory 609, and a computer program stored in the memory 609 and capable of running on the processor 610, where the computer program is executed by the processor 610 to implement each process of the above channel state information feedback method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

Referring to fig. 7, fig. 7 is a second structural diagram of a network side device according to an embodiment of the present invention, and as shown in fig. 7, a network side device 700 includes: a processor 701, a memory 702, a user interface 703, a transceiver 704, and a bus interface.

In this embodiment of the present invention, the network side device 700 further includes: a computer program stored on the memory 702 and executable on the processor 701, the computer program when executed by the processor 701 performing the steps of:

receiving, by the transceiver 704, a first quantized value sent by a terminal, where the first quantized value is obtained by quantizing M tap coefficient vectors extracted by the terminal from a first window of Q windows corresponding to a first precoding vector;

generating a second precoding vector corresponding to the first precoding vector according to the first quantization value;

wherein Q and M are both positive integers.

Optionally, the first window satisfies at least one of the following:

wherein P is a desired number of the first windows.

Optionally, the computer program may further implement the following steps when executed by the processor 701:

first configuration information is sent to the terminal through the transceiver 704, where the first configuration information is used to configure a value of P.

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

first configuration information for configuring the length of each of the Q windows is sent to the terminal through the transceiver 704.

receiving, by a transceiver 704, window position information of a first window sent by the terminal, where the window position information is used to indicate a position of the first window;

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 702, being linked together. 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 704 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 user interface 703 may also be an interface capable of interfacing externally to a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 2601 in performing operations.

The network side device 700 can implement each process implemented by the network side device in the above method embodiments, and is not described here again to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements each process of the foregoing channel state information feedback method embodiment or the foregoing channel state information receiving method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A channel state information feedback method is applied to a terminal, and is characterized in that the method comprises the following steps:

determining Q windows according to N tap coefficient vectors, wherein the N tap coefficient vectors are obtained by a first pre-coding vector through Inverse Discrete Fourier Transform (IDFT);

extracting M tap coefficient vectors from a first window of the Q windows;

wherein N is an integer greater than 1, and Q and M are both positive integers;

the first window satisfies at least one of:

wherein P is a desired number of the first windows.

2. The method of claim 1, wherein determining Q windows from the N tap coefficient vectors comprises:

determining Q first tap coefficient vectors of the N tap coefficient vectors;

3. The method of claim 2, wherein an ith one of the Q first tap coefficient vectors satisfies at least one of:

the tap amplitude of the ith first tap coefficient vector is greater than the tap amplitude of the second tap coefficient vector, and the ith first tap coefficient vector is separated from the second tap coefficient vector by one tap position;

wherein the value range of i is 1 to Q.

4. The method of claim 2, wherein determining Q windows from the Q first tap coefficient vectors comprises:

5. The method of claim 1, wherein the first window comprises: the first P windows of the Q windows are sorted from large to small according to a second value;

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

6. The method of claim 1, wherein the value of P is agreed by a protocol or configured by a network side device.

7. The method of claim 1, wherein the length of each of the Q windows is agreed by a protocol or configured by a network side device.

8. The method of claim 1, wherein after said extracting M tap coefficient vectors from a first window of said Q windows, the method further comprises:

9. The method of claim 8, wherein the window position information comprises at least one of: window starting point position, window center position, window end point position.

10. A channel state information receiving method is applied to network side equipment, and is characterized by comprising the following steps:

wherein Q and M are positive integers;

the first window satisfies at least one of:

wherein P is a desired number of the first windows.

11. The method of claim 10, wherein the receiving terminal is configured to precede the first quantized value sent by the receiving terminal, and further comprising:

12. The method of claim 10, wherein the first window comprises: the first P windows of the Q windows are sorted from large to small according to a second value;

wherein the second value is any one of:

the power average of all tap coefficient vectors within the window.

13. The method of claim 10, wherein the receiving terminal is configured to precede the first quantized value sent by the receiving terminal, and further comprising:

14. The method of claim 10, wherein before generating a second precoding vector corresponding to the first precoding vector based on the first quantization value, the method further comprises:

generating a second precoding vector corresponding to the first precoding vector according to the first quantization value includes:

15. The method of claim 14, wherein the window position information comprises at least one of: window starting point position, window center position, window end point position.

16. A terminal, characterized in that the terminal comprises:

a first sending module, configured to send a first quantized value to a network-side device, where the first quantized value is obtained by quantizing the M tap coefficient vectors;

wherein N is an integer greater than 1, and Q and M are both positive integers;

the first window satisfies at least one of:

wherein P is the desired number of the first windows.

17. A network side device, wherein the network side device comprises:

wherein Q and M are positive integers;

the first window satisfies at least one of:

wherein P is a desired number of the first windows.

18. A terminal comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the channel state information feedback method according to any one of claims 1 to 9.

19. A network-side device comprising a processor, a memory and a computer program stored on the memory and operable on the processor, wherein the computer program, when executed by the processor, implements the steps of the channel state information receiving method according to any one of claims 10 to 15.

20. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, implements the steps of the channel state information feedback method according to any one of claims 1 to 9, or the steps of the channel state information receiving method according to any one of claims 10 to 15.