WO2017167161A1

WO2017167161A1 - Method and apparatus for realizing channel state information feedback, and computer storage medium

Info

Publication number: WO2017167161A1
Application number: PCT/CN2017/078329
Authority: WO
Inventors: 吴昊; 陈艺戬; 李儒岳; 鲁照华; 蔡剑兴; 肖华华; 李永; 王瑜新
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-31
Filing date: 2017-03-27
Publication date: 2017-10-05
Also published as: CN107294642A

Abstract

Disclosed are a method and apparatus for realizing channel state information (CSI) feedback, and a computer storage medium. The method comprises: a terminal quantizing, according to a precoding codebook, CSI obtained by means of measurement so as to obtain a CSI quantization vector or matrix; and the terminal feeding indication information about the CSI quantization vector or matrix back to a base station. The indication information comprises at least one piece of the following information: at least one piece of precoding matrix index (PMI) information; and a rank indicator (RI), wherein the value of the RI is r, r being greater than or equal to 1. A codeword included in a precoding codebook used for quantization is indicated by at least one piece of PMI information.

Description

Method, device and computer storage medium for realizing channel state information feedback

Technical field

This document relates to, but is not limited to, the field of wireless communications, and more particularly to a method, apparatus, and computer storage medium for implementing channel state information (CSI) feedback.

Background technique

In a wireless communication system, the transmitting end and the receiving end generally use multiple antennas to transmit and receive to obtain a higher rate. Multi-antenna technology utilizes channel characteristics to form multi-layer transmissions with matching channel characteristics, and has a targeted radiation direction of signals, which effectively improves system performance without increasing bandwidth and power, and is widely used in existing communication systems. application. The data transmission performance of multi-antenna technology mainly depends on the measurement and feedback of channel information. Therefore, the measurement and feedback of CSI is the core content of multi-antenna technology; the accuracy, overhead and robustness of CSI measurement and feedback are guaranteed. important question.

The measurement and feedback of CSI is simple in the early versions of LTE systems. As the accuracy requirements become higher and higher, in order to pursue higher quantization efficiency without the need to significantly increase the pilot overhead, feedback overhead and quantization complexity. The measurement and feedback of CSI has become more and more complicated. In addition, for a variety of different scenarios, antenna configurations have better adaptability, and a large number of new designs have also been introduced. Here are some basics related to CSI measurement and quantitative feedback:

CSI reference signal

In the early LTE version, the downlink CSI performs downlink channel measurement by transmitting a cell-specific reference signal (CRS). A major limitation of the CRS is that it only supports pilot transmission of up to 4 ports; with 8 ports, 16 Ports are successively introduced into LTE, so CRS is no longer applicable, and user-specific channel state information reference signals (CSI-RS) are used for measurement of downlink channel information. CSI-RS is divided into two categories: non-precoded pilot (NP CSI-RS) and precoded pilot (BFed CSI-RS). For NP CSI-RS, the base station transmits pilots on all ports and the user receives pilots. And measuring and feeding back channel information to obtain channel state information. For BFed CSI-RS, the base station is a different port The group configures the precoding matrix, and will load the CSI-RS on the precoding matrix on the K set (K ≥ 1) CSI-RS resource, and the user measures the equivalent channel and feeds back the CSI on the best CSI-RS resource. .

CSI feedback content

The CSI feedback includes: Channel Quality Indication (CQI), Precoding Matrix Indicator (PMI), and Rank Indicator (RI). CQI is an indicator to measure the quality of downlink channels. In the 36-213 protocol, CQI is represented by an integer value of 0-15, which respectively represents different CQI levels, and different CQI levels correspond to corresponding modulation modes and code rate (MCS). The RI is used to describe the number of spatially independent channels, corresponding to the rank of the channel response matrix. In the open-loop spatial multiplexing and closed-loop spatial multiplexing modes, the user equipment (UE) is required to feed back the RI information. In other modes, the RI information is not required to be fed back. The rank of the channel matrix corresponds to the number of layers. Based on the index feedback, the PMI feeds back the best precoding matrix indication index, indicating the codeword of the agreed codebook that best matches the characteristics of the current channel. The standard supports the use of the Codebook Subset Restriction for each UE. The codebook is configured.

CSI feedback method

There are two main ways of feedback from the terminal CSI: the base station can configure the terminal to measure and quantize the channel information, and periodically feedback the content of the quantized CSI feedback (including RI/PMI/CQI) through the uplink control channel (PUCCH). The base station can also trigger the terminal to perform CSI feedback content (including RI/PMI/CQI) reporting when necessary, to overcome the problem that the periodic feedback is not high enough, and the CSI quantization precision is limited by the control channel overhead.

CSI process (Process)

The 3rd Generation Partnership Project (3GPP) also introduces the concept of a CSI process. A base station can configure multiple CSI processes for a terminal. Each CSI process is equivalent to a CSI measurement and feedback process, and between each CSI process is Independent, parameter configuration can be performed separately. In transport mode 9, one CSI Process is supported, and up to four CSI Processes can be supported in transport mode 10. The configuration of the channel measurement part and the configuration of the interference measurement part and the feedback mode are defined in the configuration of each CSI process, and the interference measurement part may be a single interference measurement configuration (csi-IM-ConfigId) or a configuration of the interference measurement list ( csi-IM-ConfigIdList), the latter is mainly used for time division duplex (TDD) support to enhance uplink and downlink interference management and traffic adaptation (eIMTA) situation. The configuration of the CSI process may also include some other configuration information such as pilot power (Pc) information, codebook limit (Codebook Subset Restriction) bitmap file (bitmap) indication information, and 4Tx codebook version selection indication information.

Codebook feedback introduction

The basic principle of codebook-based channel information quantization feedback is briefly described as follows: Assuming that the limited feedback channel capacity is B-bits/Hz (bps/Hz), then the number of available codewords is N=2 ^B. The eigenvector space of the channel matrix is quantized to form the codebook space

The transmitting end and the receiving end jointly save or generate the same codebook space in real time.

Implementing the channel information matrix (H) for each channel, the receiving end is from the codebook space according to certain criteria

Select a codeword that best matches the channel implementation H

And the code word

The codeword serial number (sequence number i) is fed back to the transmitting end. Here, the code word number is called the PMI in the code book. The transmitting end finds the corresponding precoding codeword according to the sequence number i

Thereby obtaining corresponding channel state information,

The feature vector information of the channel is indicated. Here, the channel implementation H is generally obtained by channel measurement based on channel measurement pilots.

General code space

The codebook corresponding to the ranks of the plurality of matrices may be further divided into a plurality of codewords corresponding to the plurality of codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the number of Rank and non-zero feature vectors of the channel are equal, in general, when the Rank is N, the codeword will have N columns. Therefore, the codebook space

It can be divided into multiple subcodebooks according to the difference of Rank, as shown in Table 1.

Table 1

The codewords to be stored when Rank>1 are in the form of a matrix, and the codebook in the LTE protocol is the feedback method of the codebook quantization. In fact, the precoding codebook and the channel information quantization codebook meaning in LTE it's the same. In the following, for the sake of uniformity, the vector can also be seen as a A matrix with a dimension of 1.

The codebook of LTE is also evolving with the evolution of the standard version. In the Release 8 and Release 9, the 4-antenna codebook and the 2-antenna codebook are in the form of a single codeword, and there is only one PMI. Its value is expressed as i = 1, ..., N11, and N11 are the number of code words. In the 8-antenna codebook of Release 10 and the 4-antenna codebook of Release 12, it is the form of double-codebook feedback, that is, the codeword can be written in the form of W=W1*W2, and W1 is the codebook of long-term feedback, generally There are N11 groups, each group includes M1 candidate beams, and the user selects a group index of N11 groups to feed back to the base station. This feedback is generally quantized and fed back by PMI1, and its value is generally i1==1,..., N11 indicates that N11 is the number of W1; W2 represents a short-term feedback codebook, and its role is to select one of the M1 candidate beams in the W1 codeword and each polarization direction of the same data layer. The selected beam selects the polarization phase (Co-phasing), and each codeword in W2 is quantized and fed back by PMI 2, and its value is i2=1,..., M1, M1 is the number of W2, under each Rank The values of N11 and M1 are different. For details, refer to the Release 10 protocol of LTE.

The codewords before Release 12 are for 1D antenna arrays and belong to 1D codewords. In the design of Release 13 codebook, the size of the codebook becomes larger due to the use of more antennas. The topology of the antenna is also generally planar, that is, the antenna with two dimensions is designed with 2D code words. Thus each beam in codeword W1 has a form of 2-dimensional form

Where v _m and u _n are discrete Fourier transforms (DFT, Discrete Fourier Transform) of the first dimension and the second dimension, respectively, m=1, 2, . . . , N ₁₁ , n=1, 2, . . . , N ₁₂ .

The Kronecker product representing v _m and u _n , the number of N1 of the first dimension port (the port in this paper includes the antenna / port / transmission unit / array / array element, etc.) The number of ports in the second dimension is N2, and the DFT corresponding to the first dimension port is oversampled by O1 times, and the DFT corresponding to the second dimension port is oversampled by O2 times, and the discrete dimension of the first dimension or the second dimension antenna is The number of the inner leaf vectors is a multiple of the oversampling factor of the number of ports. For each of the above PMI 11 and PMI 12 indexes, there are M1 W2 code words, and each W2 code word is to select a 2-dimensional beam from W1.

And Co-phasing of different polarization directions, the corresponding codeword index is PMI2, and is represented by i2=1, . . . , M1. Since the sum of the number of bits of the feedback of PMI 11, PMI 12 and PMI 2 is generally large, the feedback overhead is large, and the complexity of the user selecting the codebook is high. To solve this problem, the standard organization passes the M1 in W2. The codewords are divided into K configurations, each of which includes a subset of codebooks in M1 codewords. The configuration command is generally configured by the high-level signaling codebook sub-set selection configuration signaling (Codebook-Subset-Selection Config), and the signaling includes four possible values of Config1, Config2, Config3, and Config4.

Without loss of generality, the codeword of the first dimension port number N11=1 or the second dimension port number N12=1 is regarded as a 1D codeword, and the first dimension port number N11>1 and the second dimension port number N12>1 The code word is treated as a 2D code word. If it is a 1D codeword and the single codeword structure is represented by PMI or i, if it is a 1D codeword and is represented by PMI 1 and PMI 2 in a double codeword structure, the index is jointly represented by i1/i2, if it is a 2D code The words are represented by three codebook indexes of PMI11, PMI12, and PMI2 or by indexes i11, i12, and i2.

In the related art, the terminal selects a beam group through PMI 1, selects a beam in the beam group through PMI 2, and determines parameters such as a polarization phase and a precoding model, that is, a beam group selected by PMI 1 determines the terminal. The general direction in which the optimal beam is located. As the number of antenna ports increases, the beam becomes narrower, and the coverage of the beam group selected by PMI 1 will become smaller. Therefore, the general direction of the optimal beam of the terminal may not be correctly represented, and the robustness of the feedback CSI of the terminal is reduced. Sex.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

To solve the existing technical problems, the embodiments of the present invention provide a method, an apparatus, and a computer storage medium for implementing CSI feedback.

In one aspect, an embodiment of the present invention provides a method for implementing CSI feedback, including:

The terminal quantizes the CSI obtained by the measurement according to the precoding codebook to obtain a CSI quantization vector or matrix;

The terminal feeds back the indication information of the CSI quantization vector or matrix to the base station;

The indication information includes at least one of the following information:

At least one PMI information; RI;

The value of RI is r, and the value of r is greater than or equal to 1;

The codeword included in the precoding codebook used for performing the quantization is referred to by at least one PMI information Show.

Optionally, the method further includes:

The terminal divides part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and respectively determines at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information. .

Optionally, determining at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information, including:

Determining, by the terminal, at least one of the sub-information obtained by the dividing, and at least one of PMI information other than the PMI information for performing sub-information division in the indication information, determining the frequency domain feedback granularity and the time domain feedback period. At least one of them.

Optionally, the method further includes:

The terminal obtains, by using at least one of the following manners, the number, the sub-information, and the other information of the sub-information for jointly determining at least one of the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information. PMI information:

Radio resource control (RRC) signaling from a base station;

Channel measurement results.

Optionally, when the terminal obtains the number of the sub-information, the sub-information, and the other PMI information by using the channel measurement result, the method further includes:

The terminal reports the number of the sub-information obtained by the channel measurement result, the sub-information, and the other PMI information to the base station.

Optionally, the indication information includes at least two pieces of PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI information jointly indicated by the value combination include at least two groups of codes. Word, the method further includes: configuring different codeword parameters of different group codewords.

Optionally, the configuring different codeword parameters of the different group codewords comprises: configuring the codeword parameters of the different group codewords to include different codeword parameters linearly related to the PMI determined by the value.

Optionally, the terminal determines the number of groups of the codewords and the codeword parameters of the different groups of codewords by at least one of:

RRC signaling from the base station;

Channel measurement results.

Optionally, when the terminal determines the number of groups of the codewords and the codeword parameters of the different groups of codewords by using the channel measurement result, the method further includes:

The terminal reports the determined number of sets of codewords and the configuration parameters of the codeword parameters of the different sets of codewords to the base station.

On the other hand, an embodiment of the present invention further provides an apparatus for implementing CSI feedback, including:

a quantization unit configured to quantize the CSI obtained by the measurement according to the precoding codebook to obtain a CSI quantization vector or matrix;

a feedback unit configured to feed back indication information of the CSI quantization vector or matrix to a base station;

The indication information includes at least one of the following information: at least one PMI information; RI;

The value of the RI is r, and the r is greater than or equal to 1;

The codeword included in the precoding codebook used for performing the quantization is indicated by at least one PMI information;

Optionally, the device further includes:

a sub-information unit, configured to divide part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and respectively determine a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information At least one.

Optionally, the sub-information unit is configured to

And dividing part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information;

Determining at least one of the frequency domain feedback granularity and the time domain feedback period by combining at least one of the sub-information obtained by the dividing with at least one of PMI information other than PMI information for performing sub-information partitioning in the indication information One.

Optionally, the device further includes:

Obtaining a parameter unit, configured to obtain, by at least one of the following manners, the sub-letter for jointly determining at least one of the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information Number of messages, sub-information, and other PMI information:

RRC signaling from the base station;

Channel measurement results.

Optionally, the device further includes a reporting unit, configured to report, by using the channel measurement result, the number of the sub-information, the sub-information, and the other PMI information by using the channel measurement result, and reporting, by using the channel measurement result, The number of sub-information, sub-information, and the other PMI information are sent to the base station.

Optionally, the indication information includes at least two pieces of PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI information jointly indicated by the value include two or more sets of codebooks. A codeword, the apparatus further comprising a configuration codeword parameter unit configured to configure different codeword parameters of the different sets of codewords.

Optionally, the configuration codeword parameter unit is configured such that the codeword parameters configuring the different sets of codewords comprise different codeword parameters that are linearly related to the PMI determined by the value.

Optionally, the apparatus further includes a codebook configuration determining unit configured to determine the number of groups of the codewords and the codeword parameters of the different sets of codewords by at least one of:

RRC signaling from the base station;

Channel measurement results.

Optionally, the device further includes a codeword information reporting unit, configured to: when the codebook configuration determining unit determines the number of groups of the codewords and the codeword parameters of the different groups of codewords by using the channel measurement result, reporting the determined codewords The number of groups and configuration parameters of the codeword parameters of the different sets of codewords are to the base station.

In another aspect, an embodiment of the present invention provides a computer storage medium, the computer storage medium comprising a set of instructions that, when executed, cause at least one processor to perform the above-described method of implementing CSI feedback.

Compared with the related art, the technical solution of the embodiment of the present invention includes: the terminal quantizes the measured CSI according to the precoding codebook, and obtains a CSI quantization vector or matrix; the terminal feeds back CSI quantization vector or matrix indication information to the base station; indication information At least one of the following information is included: at least one PMI information; RI; wherein the value of RI is r, r is greater than or equal to 1; the codeword included in the precoding codebook used for quantization is indicated by at least one PMI information. The solution of the embodiment of the present invention, After the CSI is quantized according to the codebook, at least one of the at least one PMI information and the RI is used as the indication information to feed back to the base station, which improves the robustness of the terminal feedback channel state information.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

DRAWINGS

FIG. 1 is a flowchart of a method for implementing CSI feedback according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of an apparatus for implementing CSI feedback according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

FIG. 1 is a flowchart of a method for implementing CSI feedback according to an embodiment of the present invention, as shown in FIG. 1 , including:

Step 100: The terminal quantizes the measured CSI according to the precoding codebook to obtain a CSI quantization vector or matrix.

Step 101: The terminal feeds back CSI quantization vector or matrix indication information to the base station.

In the method of the embodiment of the present invention, the base station generates precoding according to the CSI quantization vector or matrix indication information fed back by the terminal;

Here, the indication information may include at least one of the following information:

At least one PMI information; RI.

Wherein, the value of RI is r, and r is greater than or equal to 1;

The codewords contained in the precoding codebook used for quantization are indicated by at least one PMI information.

It should be noted that r is a value obtained from CSI, and indicates the number of column vectors included in each codeword in the precoding codebook, and r is greater than or equal to 1. For different r, the precoding codebook used may be different. The PMI reflects the number of the codeword in the codebook, and the base station can uniquely determine the precoding through r and PMI.

In other words, RI = r, the codeword contained in the codebook used for quantization is jointly indicated by n PMIs (PMI1, PMI2, ... PMIn), n is an integer greater than or equal to 1, and each of the precoding codebooks The codewords contain r column vectors.

In an embodiment, the method of the embodiment of the present invention further includes:

The terminal divides part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and determines at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information.

In the actual application, the terminal divides part or all of the bits corresponding to the at least one PMI information in the indication information into one sub-information.

In other words, the terminal may divide part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and the terminal respectively responds to the frequency domain feedback granularity and time domain corresponding to each sub-information. At least one of the feedback periods is determined; the number of divided sub-information represents sub-information divided into several parts.

In an embodiment, determining at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information includes:

The terminal determines at least one of the frequency domain feedback granularity and the time domain feedback period by using at least one of the sub-information obtained by the partitioning and at least one of the PMI information other than the PMI information in which the sub-information is divided in the indication information. Here, the joint determination can also be understood as a joint configuration;

The terminal obtains, by using at least one of the following methods, the number, sub-information, and other PMI information of the sub-information for jointly determining at least one of the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information:

RRC signaling from the base station; this includes notifying the terminal by RRC signaling from the base station.

Channel measurement results.

Here, the channel measurement result includes the channel measurement result of the terminal itself.

When the terminal obtains the number of sub-information, the sub-information, and other PMI information by using the channel measurement result, the method in the embodiment of the present invention further includes:

The terminal reports the number of sub-information obtained by the channel measurement result, sub-information, and other PMI information to the base station.

In an embodiment, the indication information includes at least two PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI information jointly indicated by the value combination include at least two groups of codes. In this case, the method of the embodiment of the present invention further includes: configuring different codeword parameters of different groups of codewords.

In an embodiment, configuring different codeword parameters for different sets of codewords comprises: configuring the codeword parameters of the different sets of codewords to include different codeword parameters that are linearly related to the determined PMI.

In an embodiment, the terminal determines the number of groups of codewords and the codeword parameters of different groups of codewords by at least one of:

According to RRC signaling from the base station;

Channel measurement results.

When the terminal determines the number of groups of the codewords and the codeword parameters of the different groups of codewords by using the channel measurement result, the method of the embodiment of the present invention further includes:

In the method of the embodiment of the present invention, after the CSI is quantized according to the codebook, at least one of the PMI information and the RI is used as the indication information to be fed back to the base station, and the number of beams covered by each group of PMIs is increased, and the feedback channel state of the terminal is improved. Robustness of information.

2 is a structural block diagram of an apparatus for implementing CSI feedback according to an embodiment of the present invention. As shown in FIG. 2, the method includes: a quantization unit 21 and a feedback unit 22;

The quantization unit 21 is configured to quantize the CSI obtained by the measurement according to the precoding codebook to obtain a CSI quantization vector or matrix;

The feedback unit 22 is configured to feed back indication information of the CSI quantization vector or matrix to the base station.

Here, the indication information includes at least one of the following information:

At least one PMI information; RI.

Wherein, the value of RI is r, and r is greater than or equal to 1;

In an embodiment, the apparatus of the embodiment of the present invention further includes a sub-information unit 23;

The sub-information unit 23 is configured to divide part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and determine the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information respectively. At least one of them.

In an embodiment, the sub-information unit 23 is specifically configured to:

And dividing part or all of the bits corresponding to the at least one PMI information in the indication information into at least one upper sub-information;

At least one of the frequency domain feedback granularity and the time domain feedback period is determined by combining at least one of the upper sub-information obtained by the partitioning with at least one of the PMI information other than the PMI information in which the sub-information is divided in the indication information.

In an embodiment, the apparatus of the embodiment of the present invention further includes an acquiring parameter unit 24;

The obtaining parameter unit 24 is configured to obtain, by using at least one of the following methods, the number, sub-information, and other information of the sub-information for jointly determining at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information. PMI information:

RRC signaling from the base station;

Channel measurement results.

In an embodiment, the apparatus of the embodiment of the present invention further includes a reporting unit 25 configured to: when the parameter unit 24 obtains the number, sub-information, and other PMI information of the sub-information by using the channel measurement result, reporting the sub-report obtained by the channel measurement result The number of messages, sub-information, and other PMI information to the base station.

In an embodiment, the indication information includes at least two PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI information jointly indicated by the value combination include at least two groups of codes. word,

The apparatus of the embodiment of the present invention further includes a configuration codeword parameter unit 26 configured to configure different codeword parameters of different groups of codewords.

In an embodiment, the configuration codeword parameter unit 26 is specifically configured to configure the codeword parameters of the different sets of codewords to include different codeword parameters that are linearly related to the PMI determined by the value.

In an embodiment, the apparatus of the embodiment of the present invention further includes a codebook configuration determining unit 27 configured to determine the number of groups of codewords and the codeword parameters of different groups of codewords by at least one of:

RRC signaling from the base station;

Channel measurement results.

The device of the embodiment of the present invention further includes a codeword information reporting unit 28 configured to report the determined codeword group when the codebook configuration determining unit 27 determines the number of groups of codewords and the codeword parameters of different groups of codewords by using the channel measurement result. The number and configuration parameters of the codeword parameters of the different sets of codewords are sent to the base station.

In practical applications, the quantization unit 21, the sub-information unit 23, the acquisition parameter unit 24, the configuration codeword parameter unit 26, and the codebook configuration determining unit 27 may be implemented by a processor in a device that implements CSI feedback; the feedback unit 22 The processor in the apparatus for implementing CSI feedback can be implemented in conjunction with a communication interface; the reporting unit 25 and the codeword information reporting unit 28 can be implemented by a communication interface in a device that implements CSI feedback.

The method of the present invention will be described in detail below by way of application examples, and the application examples are only used to illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.

It should be noted that, in the application example, W ₁ uses PMI ₁ for quantization and feedback, W ₂ uses PMI ₂ for quantization and feedback, and W ₃ uses PMI ₃ for quantization and feedback, thereby transforming the adjusted content, which is the same as the above example. .

Application example 1

This application example provides an alternative implementation of a codebook configuration; the terminal estimates the channel by receiving the channel measurement reference signal sent by the base station, and obtains the optimal PMI feedback to the base station through the precoding codebook. In LTE Rel-13, the precoding indication index information is divided into two levels, namely PMI ₁ and PMI ₂ , respectively, and the PMI ₁ frequency domain feedback granularity and period are greater than PMI ₂ . The base station side, with the precoding matrix W PMI ₁ to PMI ₂ indicates ₁ indicates a precoding matrix W ₂ synthesis of the final precoding matrix W = W ₁ W _2, wherein W is _a row are each DFT or DFT vector The Kronecker product of the vector has up to 4 columns representing the selected beam set. Specifically, PMI ₁ contains two dimensional information, PMI _1,1 and PMI _1,2 , respectively representing a set of horizontal and vertical dimension beams. vector. W ₂ includes beam selection information, polarization phase information, precoding model selection information, etc. In order not to impose excessive overhead on the feedback, the PMI ₁ feedback is usually limited to no more than 11 bits, and the PMI ₂ feedback is not more than 4 bits. In increasing the number of ports, the case where the beam is narrowed, in order to solve the problem of robust precoding, W is _a need to enhance the coverage of beam sets. The solution in this embodiment is to increase the beam in W ₁ determined by PMI ₁ to a maximum of 8 columns, so that it is necessary to increase the number of bits selected by the column in W ₂ . The specific method may be to extend the beam group represented by PMI ₁ into the corresponding W ₁ beam group of PMI _1-1 and PMI _1-2 in the original Rel-13, and PMI _1-2 is a linear function of PMI _1-1 , for example, PMI _1-2 = PMI _1-1 +1, the codebook thus constructed contains a total of two sets of beam vectors of 8 different parameters, and two beam groups are mapped to two codeword groups, and different codeword groups respectively correspond to PMI. The beam set indicated by the linear function PMI _{1-2 of} _1-1 and PMI _1-1 . Specifically, the precoding codebook with r 1 is taken as an example. For different values of CodebookConfig in RRC signaling, the codeword group is as follows:

CodebookConfig=Config 1, codeword group 1 contains horizontal beam PMI _1-1,1 , vertical beam PMI _1-1,2 corresponding codeword, beam group 2 contains horizontal beam PMI _1-2,1 , vertical beam PMI _{1-2 2} corresponding codeword; corresponding precoding codebook is shown in Table 2. In Table 2, i represents PMI.

Table 2

CodebookConfig=Config 2, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 and vertical beam 2* PMI _1-1 , 2 +1 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1 , 2 corresponding codeword, horizontal beam 2*PMI _1-1,1 + 1 and vertical beam 2*PMI _1-1, 2 +1 corresponding codeword, codeword group 2 contains horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 +1 corresponding codeword, horizontal beam 2*PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 corresponding code Word, horizontal beam 2*PMI _1-2, 1 +1 and vertical beam 2*PMI _1-2, 2 +1 corresponding codeword; corresponding precoding codebook is shown in Table 3. In Table 3, i represents PMI.

CodebookConfig=Config 3, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1,2 +1 corresponding codeword, horizontal beam 2*PMI _1-1,1 +2 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _{1-1, 1} +3 and vertical beam 2 * PMI _1-1, 2 +1 corresponding code word, code word group 2 contains horizontal beam 2 * PMI _{1-2, 1} and vertical beam 2 * PMI _1-2, 2 corresponding code word, Horizontal beam 2*PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 +1 corresponding codeword, horizontal beam 2*PMI _1-2,1 +2 and vertical beam 2*PMI _{1-2 2} , corresponding codeword, horizontal beam 2*PMI _{1-2, 1} +3 and vertical beam 2*PMI _1-2, 2 +1 corresponding codeword; corresponding precoding codebook is shown in Table 4. In Table 4, i represents PMI.

table 3

Table 4

CodebookConfig=Config 4, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +2 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 + 3 and vertical beam 2*PMI _1-1, 2 corresponding codeword, codeword group 2 contains horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2* PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2*PMI _1-2,1 +2 and vertical beam 2*PMI _1-2,2 corresponding codeword, Horizontal beam 2*PMI1 _-2,1 +3 and vertical beam 2*PMI _1-2,2 corresponding codeword; corresponding precoding codebook is shown in Table 5. In Table 5, i represents PMI.

As described above, between the two codeword groups, except for the parameters linearly related to PMI ₁ , other parameters can be configured to be the same, that is, the same set of polarization phase, precoding model and the like are configured for the two codeword groups, and One or several parameter types are selected according to the 4-bit PMI ₂ restriction. For example, when RI=1, one of the 8 beam groups requires 3 bits of information, so only 1 bit of information can be used to select other parameters, so A codebook can only contain at most one other type of parameter.

table 5

Application example 2

This application example gives an alternative implementation of a codebook configuration. In order to increase the coverage of the beam group, in this embodiment, the beam in W ₁ determined by PMI ₁ is increased to a maximum of 16 columns, so that the number of bits selected by the column in W2 needs to be increased. The specific method may be to expand the beam group represented by PMI ₁ into the corresponding W ₁ beam group of PMI _1-1 , PMI _1-2 , PMI _1-3 , PMI _1-4 in the original Rel-13, PMI _1-2 PMI _1-3 and PMI _1-4 are functions linearly related to PMI _1-1 , for example, PMI _1-2 = PMI _1-1 +1, PMI _1-3 = PMI _1-1 + 2, PMI _{1- 4} = PMI _1-1 +3, the codebook thus constructed contains a total of 4 sets of beam vectors of 16 different parameters, 4 beam groups are mapped to 4 codeword groups, and each codeword group corresponds to PMI _{1- 1} Beam group indicated by PMI _1-1 linear correlation functions PMI _1-2 , PMI _1-3 , PMI _1-4 . Optionally, for different values of CodebookConfig in the RRC signaling, the codeword group is as follows:

CondebookConfig=Config 1, codeword group 1 contains horizontal beam PMI _1-1,1 , vertical beam PMI _1-1,2 corresponding codeword, beam group 2 contains horizontal beam PMI _1-2,1 , vertical beam PMI _{1-2 2,} corresponding codeword, codeword group 3 includes horizontal beam PMI _1-3,1 , vertical beam PMI _{1-3, 2} corresponding codeword, codeword group 4 contains horizontal beam PMI _1-4,1 , vertical beam PMI _{1 -4,2} corresponding codeword; corresponding precoding codebook is shown in Table 6. In Table 6, i represents PMI.

Table 6

CodebookConfig=Config 2, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 and vertical beam 2* PMI _1-1 , 2 +1 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1 , 2 corresponding codeword, horizontal beam 2*PMI _1-1,1 + 1 and vertical beam 2*PMI _1-1, 2 +1 corresponding codeword, codeword group 2 contains horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 +1 corresponding codeword, horizontal beam 2*PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 corresponding code Word, horizontal beam 2*PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 +1 corresponding codeword, codeword group 3 contains horizontal beam 2*PMI _1-3,1 and vertical beam 2 *PMI _1-3,2 corresponding codeword, horizontal beam 2*PMI _1-3,1 and vertical beam 2*PMI _1-3,2 +1 corresponding codeword, horizontal beam 2*PMI _1-3,1 +1 And vertical beam 2*PMI _1-3 , 2 corresponding codeword, horizontal beam 2*PMI _1-3,1 +1 and vertical beam 2*PMI _1-3,2 +1 corresponding codeword, codeword group 4 contains horizontal Beam 2*PMI _1-4,1 and vertical beam 2*PMI _1-4,2 corresponding codeword, horizontal beam 2*PMI _1-4,1 and vertical beam 2* PMI _1-4 , 2 +1 corresponding codeword, horizontal beam 2*PMI _1-4, 1 +1 and vertical beam 2*PMI _1-4 , 2 corresponding codeword, horizontal beam 2*PMI _1-4,1 + 1 and vertical beam 2*PMI _1-4, 2 +1 corresponding codeword; the corresponding codebook is shown in Table 7. In Table 7, i represents PMI.

CodebookConfig=Config 3, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1,2 +1 corresponding codeword, horizontal beam 2*PMI _1-1,1 +2 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _{1-1, 1} +3 and vertical beam 2 * PMI _1-1, 2 +1 corresponding code word, code word group 2 contains horizontal beam 2 * PMI _{1-2, 1} and vertical beam 2 * PMI _1-2, 2 corresponding code word, Horizontal beam 2*PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 +1 corresponding codeword, horizontal beam 2*PMI _1-2,1 +2 and vertical beam 2*PMI _{1-2 2,} corresponding codeword, horizontal beam 2*PMI _{1-2, 1} +3 and vertical beam 2*PMI _1-2, 2 +1 corresponding codeword, codeword group 3 contains horizontal beam 2*PMI _1-3,1 And vertical beam 2*PMI _1-3,2 corresponding codeword, horizontal beam 2*PMI _1-3,1 +1 and vertical beam 2*PMI _1-3,2 +1 corresponding codeword, horizontal beam 2*PMI _{1 -3,1} +2 and vertical beam 2*PMI _1-3,2 corresponding codeword, horizontal beam 2*PMI _1-3,1 +3 and vertical beam 2*PMI _1-3,2 +1 corresponding codeword; The corresponding precoding codebook is shown in Table 8. In Table 8, i represents PMI.

Table 7

Table 8

CodebookConfig=Config 4, codeword group 1 contains horizontal beam 2*PMI _1-1,1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +1 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 +2 and vertical beam 2*PMI _1-1,2 corresponding codeword, horizontal beam 2*PMI _1-1,1 + 3 and vertical beam 2*PMI _1-1, 2 corresponding codeword, codeword group 2 contains horizontal beam 2*PMI _1-2,1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2* PMI _1-2,1 +1 and vertical beam 2*PMI _1-2,2 corresponding codeword, horizontal beam 2*PMI _1-2,1 +2 and vertical beam 2*PMI _1-2,2 corresponding codeword, Horizontal beam 2*PMI _1-2,1 +3 and vertical beam 2*PMI _1-2,2 corresponding codeword, codeword group 3 contains horizontal beam 2*PMI _1-3,1 and vertical beam 2*PMI _{1- 3, 2} corresponding codeword, horizontal beam 2*PMI _1-3, 1 +1 and vertical beam 2*PMI _1-3 , 2 corresponding codeword, horizontal beam 2*PMI _{1-3, 1} +2 and vertical beam 2 *PMI _1-3,2 corresponding codeword, horizontal beam 2*PMI _1-3,1 +3 and vertical beam 2*PMI _1-3,2 corresponding codeword, codeword group 4 contains horizontal beam 2*PMI _{1- 4,1} and vertical beam 2*PMI _1-4,2 corresponding codeword, horizontal beam 2*PMI _1-4,1 +1 and vertical beam 2*PMI _{1 -4,2} corresponding codeword, horizontal beam 2*PMI _1-4,1 +2 and vertical beam 2*PMI _1-4,2 corresponding codeword, horizontal beam 2*PMI _1-4,1 +3 and vertical beam 2*PMI _1-4, 2 corresponding codeword; corresponding precoding codebook is shown in Table 9. In Table 9, i represents PMI;

Table 9

As described above, only the parameters linearly related to PMI1 are different between the three codeword groups. In addition, in this case, taking RI=1 as an example, selecting one of the 12 beam groups requires 4 bits of information, so there is no redundant bit information to feed back other parameters.

Application example 3

This application example gives an alternative implementation of a codebook configuration. In Application Example 1 and Application Example 2, an alternative scheme for beam group coverage in an enhanced codebook is given: adding a beamset containing beam in the generated codebook In actual systems, different terminals may have different requirements; for example, terminals closer to the base station can better cover even when the beam is narrower; and for terminals that are narrower than the base station, It is necessary to enhance its coverage by narrow beams; therefore, the terminal can select whether to configure a larger beam group to cover as needed. An optional method of the application example includes: the base station sends a channel measurement reference signal, and the terminal measures the signal to interference and noise ratio of the channel according to the received reference signal, and selects the number of beams and the beam in the configured W ₁ beam group according to the signal to interference and noise ratio. Group configuration, optionally, the codewords in W1 can be divided into at least two groups, and different codeword groups contain different beams. The grouping manner can refer to application example 1 and application example 2, and the smaller the signal to interference and noise ratio is. The more the number of beams in each beam group, the smaller the number of beams in each beam group is. The more the terminal needs to report the configuration information to the base station, so that the base station can use the PMI information. The feedback generates a suitable precoding matrix.

Application example 4

This application example gives an alternative implementation of a codebook configuration. In the application example 1 and the application example 2, the scheme of beam group coverage in the enhanced codebook is given: increasing the number of beams included in the generated codebook: in the actual system, the base station can according to the information reported when the terminal accesses Judging the location of the terminal; thus, it can be determined whether the terminal is at the cell edge. When the base station determines that the terminal is at the cell edge, the RRC signaling configuration terminal needs to increase the number of beams in the W ₁ beam group; otherwise, the base station configures the W ₁ beam group in the Rel-13 through RRC signaling, that is, The codeword group in W1 has different beams in different codeword groups. The optional packet mode can refer to Application Example 1 and Application Example 2, and the base station uses RRC signaling to notify the terminal of the codeword packet. The base station can configure the W ₁ beam group size of the terminal in a semi-static manner by means of the RRC signaling configuration, and the overhead can be reduced.

Application example 5

This application example provides an optional implementation of a codebook configuration. To increase the problem of wideband and long-period narrow beam beam coverage, the terminal can configure the precoding indication index information as a level 3 codebook, that is, W= W ₁ W ₂ W ₃ , where W=W ₁ W ₂ W ₃ denotes PMI ₁ , PMI ₂ , PMI ₃ corresponding to W ₁ , W ₂ , and W ₃ respectively; wherein W ₁ represents broadband beam group selection information Compared with the beam group selection information in Rel-13, where W ₁ contains more beams, for example, may include up to 8 beams; W _{2 is} used to select a beam group subset, for example, 8 determined from W ₁ Four beams are selected among the beams; W ₃ and Rel-13 have the same W ₂ design for other parameter settings such as column selection and polarization phase. If the beam determined by W ₁ is divided into two sets, the feedback of W ₂ requires a 1-bit overhead; this 1-bit overhead can be fed back in the following three ways:

Method 1: and W ₁ the same granularity of feedback and the time-domain feedback interval in a frequency domain feedback, i.e. PMI ₂ completely and PMI ₁ determined jointly frequency-domain feedback granularity time domain feedback cycle of feedback; By such a feedback manner may simply beam set The subset selection information is carried in the PMI ₁ , that is, the user dynamically selects the beam group through the 1-bit wideband and long-period information; in addition, when the parameters such as the port number and the oversampling factor are unchanged, the bandwidth 11-bit limit may be exceeded. Therefore, it is necessary to reduce the oversampling factor when increasing the number of ports;

Manner 2: The same frequency domain feedback granularity and time domain feedback periodic feedback as W ₃ , that is, PMI ₂ and PMI ₃ jointly determine the frequency domain feedback granularity and time domain feedback periodic feedback; the beam group subset can be obtained by such feedback mode. Selecting the feedback carried in PMI ₂ ; this method is similar to the method in Application Example 1, that is, adding the number of beams in the generated codebook, and reducing other parameter information of 1 bit, such as polarization phase, precoding model Choose, etc.

Manner 3: With its own frequency domain feedback granularity and time domain feedback periodic feedback; wherein, the self-owned granularity is larger than W ₃ granularity, smaller than W ₁ granularity, and its own period is greater than W ₃ period and less than W ₁ period, that is, PMI _{2 is} determined. Frequency domain feedback granularity and time domain feedback periodic feedback related to PMI ₁ and PMI ₃ . Alternatively, W frequency-domain feedback granularity and time domain feedback period ₁ may be divided into a number of subbands and the subframe set, the subband and the subframe set of the feedback beam group subset selection information, and the respective sub-band and the sub-frame , feedback W ₃ information; this application example can achieve flexible feedback configuration.

Application example 6

This application example provides an optional implementation of a codebook configuration. To increase the problem of wideband and long-period narrow beam beam coverage, the terminal can configure the precoding indication index information as a level 3 codebook, that is, W= W ₁ W ₂ W ₃ , where W ₁ represents broadband beam group selection information, and compared with beam group selection information in Rel-13, where W ₁ contains more beams, for example, may include up to 16 beams, W _{2 is} used to select a subset of beam groups, for example, four beams are selected from 16 beams determined by W ₁ , and W ₂ in W ₃ and Rel-13 are identical in design, and are used for other parameters such as column selection and polarization phase. Settings. In this application example, the beams in W ₁ can be divided into 4 groups, and W ₂ can select a group to make W ₃ use the conventional column selection codebook, and thus, the feedback W ₂ information requires a 2-bit overhead. Terminal or base station may feedback information are arranged in the frequency domain and time domain granularity feedback period based on the 2-bit overhead of the channel state, can be prepared as described in Example 5, 2-bit configuration in the frequency domain which are by W ₁ and a time domain feedback granularity feedback Periodic feedback, frequency domain feedback granularity according to W ₂ and time domain feedback periodic feedback, or self-frequency domain feedback granularity and time domain feedback periodic feedback (frequency domain feedback granularity and time domain feedback period per bit may be different); Separating different frequency domain feedback granularity and time domain feedback periodic feedback, that is, dividing 2-bit PMI ₂ information into two 1-bit sub-informations, each sub-information can be combined with PMI ₁ or PMI _{3 to} determine frequency domain feedback granularity and/or The time domain feedback period; for example, the 1-bit sub-information is fed back in the information of W ₁ or W ₃ according to the self-owned frequency domain feedback granularity and the time domain feedback periodic feedback, and the 1-bit sub-information is carried out, that is, the sub-information and the PMI _{1 are} jointly determined. or _{PMI. 3} the same frequency domain and a time domain feedback granularity feedback period; may be 1-bit feedback information is carried in the sub-W _1, i.e., the combined information and PMI same sub-frequency domain and time domain feedback granularity feedback period _1, the other 1-bit sub information is carried in feedback W _3, i.e., the sub-information and PMI ₃ same frequency domain and a time domain feedback granularity feedback period. In this application example, the 2-bit information is divided into different frequency-domain feedback granularity feedbacks, which realizes a more flexible configuration of beam group coverage on the feedback.

Application example 7

This application example gives an alternative implementation of a codebook configuration; Application Example 5 and Application Example 6 show a scheme for beam group coverage in an enhanced codebook: configuring three-level precoding indication index information and adding the first The pre-coding indicates the number of beams in the index information; in an actual system, different terminals may have different requirements: for example, a terminal closer to the base station can better cover even when the beam is narrower; A terminal with a narrow base station needs to enhance its coverage by a narrow beam. Therefore, the terminal can select whether to configure the three-level precoding indication index information according to requirements. The method of the application example includes: the base station sends a channel measurement reference signal, the terminal measures the signal to interference and noise ratio of the channel according to the received reference signal, and selects the configured precoding indication index information according to the signal to interference and noise ratio: the signal to interference and noise ratio is less than When the threshold is set, the third-level precoding indication index information is configured. When the signal to interference and noise ratio is greater than the preset threshold, the traditional two-stage precoding indication index information is configured. In addition, the terminal needs to report the configuration information to the base station, so that the base station can Generate a suitable precoding matrix based on PMI feedback.

Application example 8

This application example gives an alternative implementation of a codebook configuration, in application example 1 and Example 2 shows the scheme of beam group coverage in the enhanced codebook: configuring the three-level precoding indication index information and increasing the number of beams in the index information of the first level precoding indication; in the actual system, the base station can be connected according to the terminal The information reported by the incoming time judges the location of the terminal, and thus, it can be judged whether the terminal is at the cell edge. When the base station determines that the terminal is at the cell edge, the terminal needs to perform three-level precoding through RRC signaling. Otherwise, when the base station determines that the terminal is not at the cell edge, the base station configures two-level precoding indication index in Rel-13 through RRC signaling. information. Such a base station implements a semi-static configuration of a precoding type and a number of beams included in the first stage precoding by means of RRC signaling configuration, thereby reducing system signaling overhead.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, being executed by a processor and stored in a memory. Programs/instructions to implement their respective functions. The invention is not limited to any specific form of combination of hardware and software.

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

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

These computer program instructions can also be loaded into a computer or other programmable data processing device Having a series of operational steps performed on a computer or other programmable device to produce computer-implemented processing such that instructions executed on a computer or other programmable device are provided for implementing one or more processes in a flowchart and/or Or block diagram the steps of a function specified in a box or multiple boxes.

Based on this, an embodiment of the present invention further provides a computer storage medium, the computer storage medium comprising a set of instructions, when executed, causing at least one processor to perform the foregoing method for implementing CSI feedback.

While the embodiments of the present invention have been described above, the described embodiments are merely for the purpose of understanding the invention and are not intended to limit the invention. Any modification and variation in the form and details of the embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. The scope defined by the appended claims shall prevail.

Industrial applicability

According to the solution provided by the embodiment of the present invention, the terminal quantizes the measured CSI according to the precoding codebook to obtain a CSI quantization vector or matrix; the terminal feeds back CSI quantization vector or matrix indication information to the base station; and the indication information includes at least one of the following information: : at least one PMI information; RI; wherein the value of RI is r, r is greater than or equal to 1; the codeword contained in the precoding codebook used for quantization is indicated by at least one PMI information. After the CSI is quantized according to the codebook, at least one of the at least one PMI information and the RI is used as the indication information to feed back to the base station, which improves the robustness of the terminal feedback channel state information.

Claims

A method for implementing CSI feedback of channel state information includes:

The terminal quantizes the CSI obtained by the measurement according to the precoding codebook to obtain a CSI quantization vector or matrix;

The terminal feeds back the indication information of the CSI quantization vector or matrix to the base station;

The indication information includes at least one of the following information: at least one precoding indication index PMI information; a rank indicator RI;

The value of RI is r, and the value of r is greater than or equal to 1;

The codewords contained in the precoded codebook used for performing the quantization are indicated by at least one PMI information.
The method of claim 1 wherein the method further comprises:

The terminal divides part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and respectively determines at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information. .
The method according to claim 2, wherein the determining at least one of a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information comprises:

Determining, by the terminal, at least one of the sub-information obtained by the dividing, and at least one of PMI information other than the PMI information for performing sub-information division in the indication information, determining the frequency domain feedback granularity and the time domain feedback period. At least one of them.
The method of claim 3, wherein the method further comprises:

The terminal obtains, by using at least one of the following manners, the number, the sub-information, and the other information of the sub-information for jointly determining at least one of the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information. PMI information:

Radio resource control RRC signaling from the base station;

Channel measurement results.
The method according to claim 4, wherein when the terminal obtains the number of the sub-information, the sub-information, and the other PMI information by using the channel measurement result, the method further includes:

The terminal reports the number of the sub-information obtained by the channel measurement result, the sub-information, and the other PMI information to the base station.
The method according to any one of claims 1 to 3, wherein the indication information comprises at least two PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI whose value is not determined are determined. The code book of the information joint indication includes at least two sets of code words, and the method further includes:

Configure different codeword parameters for different group codewords.
The method of claim 6 wherein said configuring different codeword parameters of different sets of codewords comprises: configuring codeword parameters of different sets of codewords comprising different codeword parameters linearly related to the determined value of PMI .
The method of claim 6, wherein the terminal determines the number of groups of the codewords and the codeword parameters of the different sets of codewords by at least one of:

RRC signaling from the base station;

Channel measurement results.
The method according to claim 8, wherein when the terminal determines the number of groups of the codewords and the codeword parameters of the different groups of codewords by using the channel measurement result, the method further includes:

The terminal reports the determined number of sets of codewords and the configuration parameters of the codeword parameters of the different sets of codewords to the base station.
An apparatus for implementing CSI feedback of channel state information includes:

a quantization unit configured to quantize the measured channel state information CSI according to the precoding codebook to obtain a CSI quantization vector or matrix;

a feedback unit configured to feed back indication information of the CSI quantization vector or matrix to a base station;

The indication information includes at least one of the following information: at least one precoding indication index PMI information; a rank indicator RI;

The value of the RI is r, and the r is greater than or equal to 1;

The codewords contained in the precoded codebook used for performing the quantization are indicated by at least one PMI information.
The device of claim 10, wherein the device further comprises:

a sub-information unit, configured to divide part or all of the bits corresponding to the at least one PMI information in the indication information into at least one sub-information, and respectively determine a frequency domain feedback granularity and a time domain feedback period corresponding to each sub-information At least one.
The apparatus of claim 11 wherein said sub-information unit is configured to

And dividing part or all of the bits corresponding to the at least one PMI information in the indication information into at least one or more sub-information;

Determining at least one of the frequency domain feedback granularity and the time domain feedback period by combining at least one of the sub-information obtained by the dividing with at least one of PMI information other than PMI information for performing sub-information partitioning in the indication information One.
The device of claim 12, wherein the device further comprises:

Obtaining a parameter unit, configured to obtain, by at least one of the following manners, a number, a sub-information, and the sub-information for jointly determining at least one of the frequency domain feedback granularity and the time domain feedback period corresponding to each sub-information The other PMI information:

Radio resource control RRC signaling from the base station;

Channel measurement results.
The device according to claim 13, wherein the device further comprises a reporting unit configured to: when the obtaining parameter unit obtains the number of the sub-information, the sub-information, and the other PMI information by using a channel measurement result, reporting The number of sub-information obtained by the channel measurement result, sub-information, and the other PMI information are sent to the base station.
The device according to any one of claims 10 to 12, wherein the indication information comprises at least two PMI information, and when one of the PMI information values is determined, the PMI information determined by the value and the PMI whose value is not determined are determined. The code association indication code contains at least two sets of codewords, and the apparatus further includes a configuration codeword parameter unit configured to configure different codeword parameters of different group codewords.
The apparatus of claim 15, wherein the configuration codeword parameter unit is configured to configure a codeword parameter of a different set of codewords to include different codeword parameters that are linearly related to the determined PMI.
The apparatus of claim 15 wherein the apparatus further comprises a codebook configuration determination a unit configured to determine a number of groups of the codeword and a codeword parameter of a different group of codewords by at least one of:

RRC signaling from the base station;

Channel measurement results.
The apparatus according to claim 17, wherein said apparatus further comprises a codeword information reporting unit configured to: said codebook configuration determining unit determines a number of groups of said codewords and codes of different sets of codewords by channel measurement results In the case of a word parameter, the determined number of sets of codewords and the configuration parameters of the codeword parameters of the different sets of codewords are reported to the base station.
A computer storage medium comprising a set of instructions that, when executed, cause at least one processor to perform the method of implementing CSI feedback as claimed in any one of claims 1 to 9.