WO2017076220A1

WO2017076220A1 - Channel state information csi feedback method, terminal and base station

Info

Publication number: WO2017076220A1
Application number: PCT/CN2016/103626
Authority: WO
Inventors: 陈文洪; 高秋彬; 陈润华; 李辉
Original assignee: 电信科学技术研究院
Priority date: 2015-11-06
Filing date: 2016-10-27
Publication date: 2017-05-11
Also published as: CN106685598B; CN106685598A

Abstract

Disclosed in the present invention are a channel state information (CSI) feedback method, terminal and base station. The method of the present invention comprises: determining, by the terminal, an arrangement of a data transmission layer and acquiring CSI by the terminal according to the arrangement of the data transmission layer, and feeding back CSI by the terminal to the base station. The present invention can improve the degree to which the CSI fed back by the terminal matches a channel state.

Description

Channel state information CSI feedback method, terminal and base station

The present application claims priority to Chinese Patent Application No. 201510751364.8, entitled "Cell State Information CSI Feedback Method, Terminal and Base Station", filed on November 06, 2015, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a channel state information CSI feedback method, a terminal, and a base station.

Background technique

Mobile and broadband have become the development direction of modern communication technology. The 3rd Generation Partnership Project (3GPP) is committed to the evolution of 3G systems as the Long Term Evolution (LTE) system, with the goal of developing 3GPP wireless access. Technology is evolving toward high data rates, low latency, and optimized packet data applications. The multi-antenna multiple-input multiple-output (MIMO) technology of the physical layer has become one of the key technologies of current mobile communication systems. The multi-antenna technology has many advantages, such as the use of multiple antennas for space division multiplexing to increase the system. Capacity, multi-antenna multiplexing gain to increase system throughput and more.

Due to the correlation of the channels in the channel matrix, the increase in capacity causes the interference to increase accordingly. If the base station can obtain certain channel state information (CSI) in some way (can be instantaneous value, it can also be short-term. Or medium- and long-term statistical information, it is possible to optimize the power, rate and even the direction of loading of each data stream by a certain pre-processing method, and it is possible to pre-empt some or all of the interference between the data streams in the terminal by pre-processing. For better performance.

Therefore, how to improve the matching degree of CSI and channel state feedback by the terminal is a problem that the industry needs to study and solve.

Summary of the invention

The embodiment of the present invention provides a CSI feedback method, a terminal, and a base station, which are used to improve the matching degree between the CSI and the channel state fed back by the terminal.

A CSI feedback method provided by an embodiment of the present invention includes:

The terminal determines an arrangement manner of the data transmission layer;

The terminal obtains CSI according to the arrangement manner of the data transmission layer;

The terminal feeds back the CSI to a base station.

The data transmission layer is arranged in a column vector arrangement manner of a precoding matrix used by the data transmission layer, or a mapping manner of a codeword to the data transmission layer, or an arrangement order of each data transmission layer.

Specifically, the terminal determines an arrangement manner of the data transmission layer, including:

The terminal determines the precoding matrix and the arrangement of the data transmission layers corresponding to the precoding matrix from the precoding matrix set.

The determining, by the terminal, the precoding matrix and the data transmission layer corresponding to the precoding matrix from the precoding matrix set, including:

The terminal obtains N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, and each precoding matrix corresponds to one Arrangement of one or more candidate data transmission layers, each candidate precoding matrix being arranged by using one precoding matrix in the precoding matrix set as a reference matrix and according to a candidate data transmission layer corresponding to the reference matrix Determined, N is an integer greater than or equal to 1;

The terminal selects one candidate precoding matrix from the N candidate precoding matrices according to the downlink channel estimation result;

The terminal obtains an arrangement manner of the reference matrix and the data transmission layer corresponding to the candidate precoding matrix according to the selected candidate precoding matrix, and uses the obtained reference matrix as the determined precoding matrix.

The terminal selects a precoding matrix from the precoding matrix set as the determined precoding matrix according to the downlink channel estimation result;

The terminal selects an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers corresponding to the selected precoding matrix.

Each of the precoding matrices in the precoding matrix set selects an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers as an arrangement manner of the data transmission layer corresponding to the precoding matrix;

The terminal selects a precoding matrix as the determined precoding matrix according to the result of the downlink channel estimation and the arrangement manner of the data transmission layer corresponding to each precoding matrix selected.

The terminal obtains CSI according to the arrangement manner of the data transmission layer, and includes:

The terminal obtains CSI according to determining a precoding matrix from the precoding matrix set and an arrangement manner of the data transmission layer corresponding to the precoding matrix.

Preferably, the CSI feedback method provided by the present invention further includes: the terminal receiving configuration information sent by the base station, where the configuration information includes indication information of a candidate data transmission layer arrangement manner.

The terminal determines an arrangement manner of the data transmission layer, including:

If the terminal determines, according to the indication information of the arrangement manner of the candidate data transmission layers included in the configuration information, The candidate data transmission layer has only one type of arrangement, and the terminal arranges the arrangement of the data transmission layers as the determined arrangement of the data transmission layer.

Further, the method further includes: the terminal feeding back the arrangement information of the data transmission layer to the base station.

Specifically, if there are multiple types of candidate data transmission layers corresponding to the determined precoding matrix, the CSI includes at least information about an arrangement manner of the data transmission layer corresponding to the determined precoding matrix.

The CSI includes one or more of a precoding matrix index PMI, a rank indication RI, and a channel quality indicator CQI.

Receiving, by the base station, the CSI fed back by the terminal, where the CSI is obtained by the terminal according to the determined arrangement of the data transmission layer;

Determining, by the base station, a precoding matrix for precoding data of the terminal according to the CSI.

Specifically, the base station determines, according to the CSI, a precoding matrix used for precoding the data of the terminal, including:

Determining, by the base station, a precoding matrix for downlink precoding from a precoding matrix set according to the CSI;

Determining, by the base station, an arrangement manner of the data transmission layer corresponding to the precoding matrix according to an arrangement manner of the data transmission layer fed back by the terminal, or an arrangement manner of the data transmission layer determined by the base station;

Determining, by the base station, a precoding matrix for precoding data of the terminal according to the determined precoding matrix and an arrangement manner of a data transmission layer corresponding to the precoding matrix.

Preferably, the channel state information CSI feedback method provided by the embodiment of the present invention further includes:

The base station sends configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.

A terminal provided by an embodiment of the present invention includes:

a first determining module, configured to determine an arrangement manner of the data transmission layer;

a second determining module, configured to obtain CSI according to the arrangement manner of the data transmission layer;

And a feedback module, configured to feed back the CSI to the base station.

Specifically, the first determining module is specifically configured to:

The precoding matrix and the arrangement of the data transmission layers corresponding to the precoding matrix are determined from the precoding matrix set.

The first determining module is specifically configured to:

Obtaining N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, each precoding matrix corresponding to one or more The arrangement of the candidate data transmission layers, each candidate precoding matrix is determined by using one precoding matrix in the precoding matrix set as the reference matrix and according to the arrangement manner of a candidate data transmission layer corresponding to the reference matrix. , N is an integer greater than or equal to 1;

Selecting a candidate precoding matrix from the N candidate precoding matrices according to a downlink channel estimation result;

Obtaining a reference matrix corresponding to the candidate precoding matrix and a data transmission layer according to the selected candidate precoding matrix, and using the obtained reference matrix as the determined precoding matrix.

The first determining module is specifically configured to:

Selecting, according to a downlink channel estimation result, a precoding matrix from the precoding matrix set as the determined precoding matrix;

An arrangement of the data transmission layers is selected from the arrangement of the candidate data transmission layers corresponding to the selected precoding matrix.

The first determining module is specifically configured to:

Selecting, by each of the precoding matrices in the precoding matrix set, an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers as a column vector arrangement manner corresponding to the precoding matrix;

And selecting, according to a result of the downlink channel estimation, and the selected arrangement of the data transmission layer corresponding to each precoding matrix, a precoding matrix as the determined precoding matrix.

The second determining module is specifically configured to:

The CSI is obtained according to determining the precoding matrix from the precoding matrix set and the arrangement of the data transmission layers corresponding to the precoding matrix.

Preferably, the terminal provided by one embodiment of the present invention further includes:

The receiving module is configured to receive configuration information sent by the base station, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.

Wherein, the CSI includes one or more of the PMI, RI, and CQI.

A base station provided by an embodiment of the present invention includes:

a receiving module, configured to receive CSI fed back by the terminal, where the CSI is obtained by the terminal according to the determined arrangement of the data transmission layer;

And a determining module, configured to determine, according to the CSI, a precoding matrix used for precoding the data of the terminal.

The determining module is specifically configured to:

Determining, from the precoding matrix set, a precoding matrix for downlink precoding according to the CSI;

Determining, according to an arrangement manner of the data transmission layer fed back by the terminal, or an arrangement manner of the data transmission layer determined by the base station, an arrangement manner of the data transmission layer corresponding to the precoding matrix;

And determining, according to the determined precoding matrix and the arrangement manner of the data transmission layer corresponding to the precoding matrix, a precoding matrix used for precoding the data of the terminal.

Preferably, the base station provided by one embodiment of the present invention further includes:

The sending module is configured to send configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.

In the CSI feedback method provided by the embodiment of the present invention, the terminal first determines the arrangement manner of the data transmission layer, and then obtains CSI according to the arrangement manner of the data transmission layer, and feeds back the CSI to the base station. For the data transmission process, the data transmission effect can be different due to the arrangement of the different data transmission layers. In the embodiment of the present invention, the terminal further determines and feeds back the CSI by first determining the arrangement manner of the data transmission layer, so that the terminal can determine The CSI fed back can reflect the actual channel state, and the CSI fed back by the instant terminal matches the channel state of the terminal.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

1 is a schematic structural diagram of a MIMO system with a single user as an example in the prior art;

2 is a schematic diagram of a transmission structure of a codebook-based precoding technology in the prior art;

FIG. 3 is a schematic flowchart of a channel state information CSI feedback method according to an embodiment of the present invention;

4 is a schematic flowchart of a channel state information CSI feedback method according to an embodiment of the present invention;

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

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a base station 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 in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be understood that the technical solution of the present invention can be applied to various communication systems, for example, Global Mobile Communications (Global System of Mobile communication, GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS) ), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, Universal Mobile Telecommunication System (UMTS), and the like.

It should be understood that, in the embodiment of the present invention, the user equipment (User Equipment, UE) includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular" The telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.

In an embodiment of the invention, a base station (e.g., an access point) may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the invention is not limited.

MIMO technology is used in LTE networks to increase system capacity and increase throughput. FIG. 1 is a structural block diagram of a MIMO system with a single user as an example. The transmitting end, such as a base station, and a receiving end, such as a terminal, have multiple antennas. At the transmitting end, the input serial code stream is converted into several parallel independent sub-code streams through a series of pre-processing (modulation, coding, weighting, mapping) and transmitted through different transmitting antennas. At the receiving end, the antenna group not less than the number of transmitting antennas is used for receiving, and the multi-channel received signal is processed in the spatial domain and the time domain by using a certain coding relationship between the estimated channel transmission characteristics and the transmitted sub-code stream, thereby Several sub-transmission sub-streams are separated and converted into serial data output. MIMO regards the channel as a number of parallel self-channels, enabling near-distance spectrum resource reuse without multiple bandwidths (multiple transmit antennas close to the same frequency and simultaneous transmission), which can theoretically greatly expand the frequency band utilization. Rate and increase the wireless transmission rate.

However, due to the correlation of the channels in the channel matrix, the increase in capacity causes the interference to increase accordingly. In order to reduce the complexity of the terminal to eliminate the influence between channels, and at the same time reduce the system overhead, the system capacity of the MIMO is maximized, which is introduced in the prior art. Precoding technology. During the physical layer processing of LTE, several main transmission modes of the physical downlink shared channel are implemented by precoding. The closed-loop precoding technique is introduced in the LTE Rel-8 system to improve the spectrum efficiency. Closed-loop precoding first requires that both the base station and the terminal maintain a set of the same precoding matrix, called a codebook. Generally, in order to reduce the feedback overhead, when designing a communication system, a plurality of precoding matrices are usually used to form a codebook (ie, a precoding matrix). set). The terminal measures the downlink channel according to the cell common reference (Cell Reference Signal, CRS), and after estimating the channel information, the UE can select the precoding matrix in the codebook based on the preset codebook, according to the prior art, for all The precoding matrix separately determines the signal energy, compares the signal energy of the precoding matrix according to some optimization criterion, selects a precoding matrix that best matches the current channel condition from the codebook, and uses the corresponding precoding matrix through the feedback link. The index is fed back to the base station through the uplink channel. This index is recorded as a Precoding Matrix Indicator (PMI). The base station can determine the precoding matrix to be used for the terminal from the received index value. The precoding matrix reported by the terminal can be regarded as a quantized value of Channel State Information (CSI). When reporting the PMI, the terminal also reports a corresponding Rank Indicator (RI) and a Channel Quality Indicator (CQI), so that the base station determines the number of codewords, the number of layers, and the use of each codeword in the downlink transmission. Modulation coding method.

Figure 2 illustrates a wireless network architecture that currently employs a codebook based precoding technique. Specifically, the structure includes a base station 201 and a terminal 202, and a wireless link 203. Both the terminal 202 and the base station 201 have multiple antennas. The terminal 202 and the base station 201 are configured with the same precoding matrix set (codebook). After measuring the downlink channel and determining the precoding matrix, the terminal 202 feeds back the precoding matrix index PMI corresponding to the precoding matrix to the base station 201 through the radio link 203. The fed back CSI may include: a CQI indicating a radio communication channel quality between the base station and the terminal, a PMI indicating a preferred precoding matrix for shaping the transmission signal, and a number of useful transport layers indicating a preferred data channel of the terminal. RI, and one or more of the estimates of channel coefficients. The fed back CSI enables the base station 201 to adaptively configure a suitable transmission scheme to improve coverage, or user data transmission rate, or more accurate prediction channel quality for future transmissions to the terminal 202.

In order to improve the matching degree of CSI and channel state fed back by the terminal, the embodiment of the present invention provides a channel state information CSI feedback method, a terminal, and a base station.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 3 is a schematic flowchart of a channel state information CSI feedback method provided by an embodiment of the present invention. The process may be implemented by a terminal, where the process includes the following steps:

Step 301: The terminal determines an arrangement manner of the data transmission layer.

The data transmission layer is arranged in a column vector arrangement manner of the precoding matrix used by the data transmission layer, or a mapping manner of the codewords to the data transmission layer, or an arrangement order of the data transmission layers.

It should be noted that, in the description of the present application, the "arrangement of the data transmission layer" can also be understood as "the arrangement of the column vectors of the precoding matrix" or "the mapping manner of the code words to the data transmission layer", or " The order of arrangement of each data transmission layer".

For example, for a precoding matrix for data precoding, since each column vector is used for precoding of one data transmission layer, the arrangement or arrangement order of the data transmission layers and the arrangement of column vectors of the precoding matrix The way is equivalent.

Specifically, step 301 can be implemented by using, but not limited to, the following solutions:

Further, the solution can be implemented by using, but not limited to, the following methods:

Method 1: The terminal obtains N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, and each precoding matrix corresponds to each precoding matrix. Arrangement of one or more candidate data transmission layers, each candidate precoding matrix being an arrangement of a candidate data transmission layer by using one precoding matrix in the precoding matrix set as a reference matrix and corresponding to the reference matrix The method is determined by the method, where N is an integer greater than or equal to 1; the terminal selects one candidate precoding matrix from the N candidate precoding matrices according to the downlink channel estimation result; and the terminal obtains the candidate precoding according to the selected candidate precoding matrix. The reference matrix corresponding to the coding matrix and the data transmission layer are arranged, and the obtained reference matrix is used as the determined precoding matrix.

The candidate data transmission layers corresponding to different precoding matrices are arranged in the same or different manners in the precoding matrix set.

Method 2: The terminal selects a precoding matrix from the precoding matrix set as the determined precoding matrix according to the downlink channel estimation result; the terminal selects from the selected candidate data transmission layer arrangement manner corresponding to the precoding matrix A way of arranging data transmission layers.

Method 3: The terminal selects, for each precoding matrix in the precoding matrix set, an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers as an arrangement manner of the data transmission layer corresponding to the precoding matrix; The terminal selects a precoding matrix as the determined precoding matrix according to the result of the downlink channel estimation and the arrangement manner of the data transmission layer corresponding to each of the selected precoding matrices.

Preferably, in the method 2, the terminal selects an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers corresponding to the selected precoding matrix, and the terminal in the scheme 3 is each precoding matrix set. The coding matrix selects a data transmission layer arrangement manner from the arrangement manner of the candidate data transmission layers, and is a process in which the terminal selects a data transmission layer arrangement manner from the arrangement manner of the candidate data transmission layers corresponding to one precoding matrix. The process can be implemented but is not limited to the following implementations:

Method 1: The terminal calculates the downlink capacity according to the arrangement manner of each candidate data transmission layer corresponding to the precoding matrix, and selects the arrangement manner of the data transmission layer corresponding to the downlink capacity with the largest value.

Specifically, for a precoding matrix, the terminal traverses the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix, calculates the downlink capacity corresponding to the arrangement manner of each candidate data transmission layer corresponding to the precoding matrix, and selects the downlink capacity from the downlink capacity. The arrangement of the largest data transmission layers is used as the arrangement of the data transmission layers corresponding to the precoding matrix. For example, the downlink capacity may be represented by the downlink transport block size, that is, the arrangement of the data transport layer corresponding to the largest downlink transport block is selected as the data transmission layer corresponding to the precoding matrix.

The mode of the data transmission layer determined by the terminal in the mode 1 according to the principle of maximizing the downlink capacity can improve the downlink transmission efficiency.

Manner 2: The terminal separately calculates a downlink signal and an interference plus noise ratio SINR of each data transmission layer corresponding to the precoding matrix (which may also be understood as each column vector in the precoding matrix), and sequentially calculates the calculated downlink SINR. Arranging, according to the data transmission layer corresponding to the sorted downlink SINR, obtaining an arrangement manner of the data transmission layer corresponding to the precoding matrix.

Specifically, for a precoding matrix, the terminal separately calculates an SINR corresponding to each data transmission layer corresponding to the precoding matrix (which can also understand each column vector in the precoding matrix), and the SINR corresponding to each data transmission layer. For example, the SINRs corresponding to the data transmission layers may be arranged from large to small, or the SINRs corresponding to the data transmission layers may be arranged in order from the smallest to the largest, and the downlink SINR corresponding to each data transmission layer is used as the pre-arrangement. The arrangement of the data transmission layers corresponding to the coding matrix.

For example, in the current downlink data transmission, the LTE system supports the transmission of the downlink two codewords at most, and each codeword can have its own modulation and coding mode, and adopts a hybrid hybrid automatic repeat request (Hybrid Automatic Repeat). reQuest, HARQ) process. A codeword can only use one modulation coding method, but can be mapped to multiple layers, and different layers can use different precoding matrices. If the number of layers transmitted downstream is greater than two, one codeword can be mapped to multiple data streams (one data stream is one layer). The mapping relationship between codewords and layers is pre-agreed: if the number of layers L is even, the number of layers per codeword mapping is L/2; if the number of layers L is odd, then mapping of two codewords The number of layers is (L-1)/2 and (L+1)/2, respectively. For example, when the number of downlink transmission layers is 4, each codeword is mapped to two data streams, and the two data streams adopt the same modulation and coding manner. When performing downlink precoding, the precoding vectors used by each data stream are different, so that the detected SINR of each data stream is different after passing through the channel. When performing CQI estimation, the terminal generally processes the SINR of all data streams mapped to the same codeword, and obtains the equivalent SINR of the codeword, thereby calculating the CQI. A common processing method, such as averaging the SINRs of all corresponding data streams, is to obtain an equivalent SINR of the codeword. If multiple data streams mapped to the same codeword have different SINR differences due to different precoding gains, they may use the same modulation and coding scheme to cause some data streams to be modulated too high or too low, and the data stream is detected. The SINRs do not match, causing the transmission throughput of these data streams to decrease, affecting the total data transmission rate.

The arrangement manner of the data transmission layer determined by the terminal in the manner of the downlink SINR in the mode 2 can make the detection SINR of the multiple data streams mapped to the same codeword relatively close, thereby reducing the base station to perform modulation according to the CQI fed back by the terminal. After the encoding, some modulation or coding modes of the data stream are too high or too low, and the spectrum efficiency of the transmission can be improved.

The process for implementing step 301 described in the method 1 and the method 3 is different from the predetermined precoding matrix described in the method 2, and the data transmission layer arrangement corresponding to the precoding matrix is determined according to the precoding matrix. The flow of the way.

The flow of the candidate data transmission layer corresponding to the precoding matrix in the precoding set needs to traverse the arrangement of the candidate data transmission layers corresponding to the precoding matrix in the precoding set, thereby implementing determining the precoding matrix and the data corresponding to the precoding matrix. The arrangement of the transport layers.

The difference between the method 1 and the method 3 is that, when the step 301 is implemented, the candidate precoding matrix set corresponding to each candidate data transmission layer of each precoding matrix is obtained from the precoding matrix in the precoding matrix set. A candidate precoding matrix is selected in the set, or a data transmission layer arrangement is selected for each precoding matrix in the precoding matrix set.

For example, the arrangement of the data transmission layer can also be understood as the arrangement of the column vectors of the precoding matrix used by the data transmission layer, so that the arrangement of the data transmission layer is understood as the column vector of the precoding matrix used by the data transmission layer. The arrangement is as an example:

If there are M precoding matrices {1, . . . , m, . . . , M} in the precoding matrix set, each precoding matrix corresponds to K candidate data transport layer arrangement manners, that is, K candidate precoding matrices. Arrangement of column vectors {1,....k,...,K}:

For the method 1, N=M×K candidate precoding matrices {1.2.....n, . . . , N} can be obtained, and the terminal pre-codes from the N=M×K candidates according to the downlink channel estimation result. A candidate precoding matrix (assumed to be n) is selected in the matrix, assuming that the candidate precoding matrix (n) is a precoding matrix (m) in the precoding matrix {1.2.....m,...,M} The terminal is arranged according to the arrangement (k) of the data transmission layer corresponding to the corresponding candidate precoding matrix, and the terminal obtains the candidate precoding matrix (n) according to the selected candidate precoding matrix (n). The reference matrix is an arrangement of the precoding matrix (m) and the data transmission layer as an arrangement of the candidate data transmission layer (k);

For method 3, the arrangement of the K candidate data transmission layers {1.2.....k for each of the M precoding matrices {1.2.....m, ..., M} is first performed. ..., K} respectively select a candidate data transmission layer arrangement as the arrangement of the data transmission layer corresponding to each precoding matrix, taking the precoding matrix (m) as an example, from K candidate data transmission layers The arrangement of the candidate data transmission layers (assumed to be k) is selected as the arrangement of the data transmission layers corresponding to the precoding matrix, and may be arranged in the arrangement {1.2.....k,...,K}. Precoding matrix (m) obtained by rearranging the original precoding matrix (m) according to the arrangement of the data transmission layer (k) to the column vector of the original precoding matrix (m), for M precoding matrices {1.2 .....m,...,M} can get M rearranged precoding matrices {1'.2'.....m',...,M'}, the terminal estimates according to the downlink channel As a result, a precoding matrix (assumed to be m') is determined from the M precoding matrices {1'.2'.....m',...,M'}, thereby according to the precoding matrix (m') determining a precoding matrix (m) and corresponding to the precoding matrix (m) The arrangement of the data transfer layers (k).

Since the downlink channel estimation result of the terminal is required to be determined and the arrangement of the candidate data transmission layers corresponding to the precoding matrix in the precoding set is required to be traversed, the processes described in the methods 1 and 3 are implemented in the actual implementation. Determining the precoding matrix in the set of coding matrices and determining the arrangement of the data transport layers from the arrangement of the candidate data transport layers may also be performed simultaneously.

Preferably, a preferred candidate data transmission layer is arranged in a manner that only reflects different data transmission layers in a plurality of codewords The allocation information, which is mapped to different ordering of different data transmission layers of the same codeword, or the data transmission layer of two codeword mappings, is an equivalent arrangement.

It should be noted that the foregoing description of the arrangement of the candidate data transmission layers is not only used for the arrangement of the candidate data transmission layers corresponding to the precoding matrix, but also for the arrangement of all other candidate data transmission layers (including candidates for the base station configuration). The arrangement of the data transfer layer).

For example, for a precoding matrix indicated by one PMI, assuming that the precoding matrix is an N×M dimensional matrix, the matrix has M N×1 dimensional column vectors, where the precoding matrix corresponds to The arrangement of the candidate data transmission layers is the arrangement of the M column vectors. For example, assuming M=3, the three column vectors may be arranged in the following order (the following numbers are the indices of the column vectors): {1, 2, 3}, {1, 3, 2}, {2, 1, 3 }, {2, 3, 1}, {3, 2, 1}, {3, 1, 2}, then the candidate column vector can be arranged {{1, 2, 3}, {1, 3, 2} One or more of {2,1,3}, {2,3,1}, {3,2,1}, {3,1,2}. Since the arrangement of the column vectors only reflects the allocation information of the different column vectors in multiple codewords, the different arrangement order of the column vectors for the same codeword, or the column vectors of the two codewords are exchanged, etc. The arrangement of effects. Therefore, in a preferred implementation manner, if it is assumed that the first column vector corresponds to the first codeword and the second and third column vectors correspond to the second codeword, then the precoding matrix corresponds to The candidate column vector arrangement can be summarized into three types: {1, 2, 3}, {2, 3, 1}, {3, 1, 2}, and other arrangements are equivalent to the three arrangements. of. The terminal determines that the arrangement of the data transmission layers corresponding to the precoding matrix refers to selecting the best one among the candidate column vector arrangements. For example, suppose that the M column vectors have the largest downlink capacity when arranged according to {1, 2, 3}, and the SINRs corresponding to the M column vectors are arranged in order from largest to smallest, and the corresponding column vectors are arranged as { 3,1,2}, if the following line capacity is the maximum criterion to select the arrangement of the data transmission layer corresponding to the precoding matrix, it is determined that {1, 2, 3} is the data transmission layer corresponding to the precoding matrix If the SINR of the plurality of data streams mapped to the same codeword is closer to the criterion and the arrangement of the data transmission layer corresponding to the precoding matrix is selected, then {3, 1, 2} is determined as The arrangement of the data transmission layers corresponding to the precoding matrix. After determining the arrangement manner of the data transmission layer corresponding to the precoding matrix, the terminal may carry information about the arrangement manner of the data transmission layer corresponding to the precoding matrix by using several bits to feed back the determined (ie, recommended) precoding of the terminal to the base station. The arrangement of the data transmission layers corresponding to the matrix.

Preferably, if the candidate data transmission layer corresponding to the precoding matrix determined by the terminal has only one type of arrangement, the terminal determines the arrangement manner of the data transmission layer corresponding to the determined precoding matrix as the pre The arrangement of the data transmission layer corresponding to the coding matrix, for example, the configuration message sent by the base station is received by the terminal, and the configuration information includes an arrangement of a unique candidate data transmission layer corresponding to the precoding matrix in the precoding matrix set. When the instructions are in the way.

Step 302: The terminal obtains CSI according to the arrangement manner of the data transmission layer.

Step 303: The terminal feeds back the CSI to the base station.

Specifically, the terminal may determine, according to the precoding matrix from the precoding matrix set, the precoding matrix and the precoding matrix pair. The CSI is obtained by the arrangement of the data transmission layers.

Since in the field of wireless communication, CSI is the channel attribute of the communication link, the degenerative factor of the signal on each transmission path, that is, the value of each element in the channel gain matrix H, such as signal scattering, environmental degradation, is described ( Fading, multipath fading or shadowing fading), information such as power decay of distance. CSI can adapt the communication system to current channel conditions, providing high reliability and high rate communication in multi-antenna systems. In the embodiment of the present invention, according to step 302, CSI can be obtained by using a precoding matrix determined from a precoding matrix set and an arrangement of data transmission layers corresponding to the precoding matrix.

The CSI may include one or more of a PMI, an RI, and a CQI of the determined precoding matrix.

Specifically, the terminal may feed back information of the arrangement manner of the data transmission layer to the base station.

For example, in some embodiments, the CSI includes one or more of a PMI, an RI, and a CQI of the determined precoding matrix, and information about an arrangement manner of the data transmission layer corresponding to the determined precoding matrix. .

Specifically, if there are multiple types of candidate data transmission layers corresponding to the determined precoding matrix, the CSI includes at least information about an arrangement manner of the data transmission layer corresponding to the determined precoding matrix;

If there is only one type of the candidate data transmission layer corresponding to the determined precoding matrix, for example, when the terminal receives the configuration information sent by the base station, according to the arrangement manner of the candidate data transmission layers included in the configuration information. And indicating that the candidate data transmission layer is arranged in only one mode, and the terminal may use the arrangement manner of the data transmission layer as the determined arrangement manner of the data transmission layer and the precoding matrix is pre- When the information is configured to correspond to a unique candidate column vector arrangement, the CSI may or may not include information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix.

The terminal may obtain part or all of the information in the CSI according to the arrangement manner of the data transmission layer corresponding to the determining precoding matrix, that is, the terminal may determine the data transmission layer corresponding to the precoding matrix according to the determining, in determining the CSI of the feedback. The arrangement of the column vectors in the determined precoding matrix is rearranged to obtain one or more feedback quantities of the reported RI, PMI, and CQI. Specifically, taking CQI as an example, since CQI is an information indication of channel quality, representing the quality of the current channel, corresponding to the signal to noise ratio of the channel, when the terminal performs CQI estimation, it is generally mapped to the same codeword. After processing the SINR of all data streams, the equivalent SINR of the codeword is obtained, thereby calculating the CQI. Therefore, according to the determined precoding matrix and the arrangement manner of the data transmission layer corresponding to the precoding matrix, one or more feedback quantities of RI, PMI, and CQI included in the CSI in the CSI process are obtained. And determining according to the determined precoding matrix and the arrangement manner of the data transmission layer corresponding to the precoding matrix.

Preferably, an implementation manner of the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix may be: the candidate of the data transmission layer corresponding to the determined precoding matrix is a candidate corresponding to the precoding matrix An index in a set formed by an arrangement of data transmission layers, wherein each candidate data transmission layer corresponding to the precoding matrix The arrangement is corresponding to an index in the collection.

For example, in some embodiments, the terminal feeds back to the base station, the index PMI of the precoding matrix that is recommended to be determined in the precoding matrix set, and the data transmission layer corresponding to the precoding matrix are arranged in all candidate data transmission layers. The index in the arrangement. The precoding matrix set is an identical set pre-configured on the base station and the terminal, and the set of candidate data transport layer arrangements is also a same set pre-configured on the base station and the terminal. The terminal may use a plurality of bits to carry information of the index PMI in the precoding matrix set of the determined precoding matrix, and use other numbers to carry the arrangement manner of the data transmission layer corresponding to the determined precoding matrix in the candidate data. The information of the index in the set of arrangement manners of the transport layer is used to feed back, to the base station, the precoding matrix determined and recommended by the terminal and the arrangement manner of the data transport layer corresponding to the precoding matrix.

Specifically, for one or more of PMI, RI, and CQI, information about an arrangement manner of a data transmission layer corresponding to the determined precoding matrix may be separately encoded to obtain the CSI; or, PMI And one or more of RI and CQI, and information about an arrangement manner of the data transmission layer corresponding to the determined precoding matrix may be jointly encoded to obtain the CSI.

Preferably, in some embodiments, one or more of PMI, RI, CQI, and information about an arrangement manner of a data transmission layer corresponding to the determined precoding matrix are jointly encoded, which may be a PMI, One or more of the RI and the CQI, for example, the PMI and the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix are jointly coded, and the data transmission layer corresponding to the determined precoding matrix is arranged. The information is that the arrangement of the data transmission layer corresponding to the determined precoding matrix is indexed in the arrangement manner of all the candidate data transmission layers, and each candidate corresponding to the precoding matrix corresponding to the PMI may be firstly selected. The arrangement of the data transmission layers is combined to obtain a list of the combination of the PMI and the data transmission layer. The list can be pre-configured on the base station and the terminal, so that when the feedback to the base station is performed, only a few bits are required to carry the determined The combination of the PMI of the precoding matrix and the arrangement of the data transmission layer in the list of the combination of the arrangement of the PMI and the data transmission layer The information introduced can reduce the system resource overhead required by the terminal to feed back to the base station through joint coding.

Preferably, the terminal may also feed back to the base station whether it is necessary to determine the arrangement of the data transmission layer when the base station performs downlink data transmission. If the feedback is required to be used, the base station determines the arrangement of the data transmission layer corresponding to the precoding matrix determined by the CSI fed back by the terminal, and then performs the downlink data pre-determination after determining the precoding matrix according to the CSI fed back by the terminal. Encoding; if the feedback is not needed, the base station may perform downlink data precoding according to the prior art, after determining a precoding matrix according to the CSI fed back by the terminal.

In the foregoing process, the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set is pre-configured on the terminal. The foregoing information pre-configured on the terminal may be agreed by the system, or may be configured by the base station to the terminal.

Specifically, the manner in which the base station configures the arrangement of the candidate data transmission layers to the terminal may be implemented by using, but not limited to, the following solutions:

The base station sends configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers. The terminal receives the foregoing configuration information sent by the base station, so that the arrangement manner information of the candidate data transmission layer can be obtained. The configuration information includes indication information of an arrangement manner of candidate data transmission layers corresponding to all or part of the precoding matrix in the precoding matrix set.

Specifically, the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set included in the configuration information may be determined by the base station according to the uplink channel estimation result of the terminal, or may be determined by the base station according to the pre-configured pre The arrangement of the candidate data transmission layers corresponding to the coding matrix is determined. The configuration information may be sent by the base station to the terminal by using the high layer signaling or the physical layer signaling (Downlink Control Information (DCI)) carried by the Physical Downlink Control Channel (PDCCH).

Another embodiment of the present invention proposes a channel state information CSI feedback method.

FIG. 4 is a schematic flowchart diagram of a channel state information CSI feedback method according to another embodiment of the present invention. The process may be implemented by a base station, and the process includes the following steps:

Step 401: The base station receives the CSI fed back by the terminal, where the CSI is obtained by the terminal according to the determined arrangement of the data transmission layer.

Step 402: The base station determines, according to the CSI, a precoding matrix used for precoding data of the terminal.

Specifically, the implementation of step 402 may include:

Specifically, the arrangement of the data transmission layer fed back by the terminal is an index in the arrangement manner of the candidate data transmission layer, and the base station determines the precoding matrix corresponding to the PMI by using the PMI in the CSI fed back by the terminal, according to the terminal feedback. The arrangement of the data transmission layers determines the index of the arrangement of the column vectors in the arrangement manner of the candidate data transmission layers, thereby determining the arrangement of the data transmission layers corresponding to the indexes from the arrangement of the candidate data transmission layers, and the base station according to the The arrangement of the data transmission layers corresponding to the index rearranges the column vectors of the precoding matrix corresponding to the PMI, and then determines a precoding matrix for precoding the data of the terminal. For example, if the precoding matrix is a matrix having a dimension of 8×4, including 4 column vectors, and the column vector arrangement information fed back by the terminal corresponds to the column vector arrangement manner {1, 3, 2, 4}, the base station After exchanging the 2nd and 3rd column vectors in the original arrangement pattern {1, 2, 3, 4} of the precoding matrix, it is determined that the precoding matrix with the arrangement of {1, 3, 2, 4} is used. And a precoding matrix for precoding the data of the terminal.

Preferably, the base station may further send configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set.

The configuration information includes indication information of an arrangement manner of candidate data transmission layers corresponding to all or part of the precoding matrix in the precoding matrix.

Specifically, the base station may determine, according to the uplink channel estimation result of the terminal, an arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set.

The base station may determine, according to the uplink channel estimation result of the terminal, a candidate data transmission layer that is optimally matched with the channel state of the terminal for the precoding matrix in the precoding matrix set, and adopts configuration information. Transmitting the indication information of the arrangement manner of the candidate data transmission layer to the terminal. In this case, the precoding matrix in the precoding matrix set can be matched according to the arrangement manner of the candidate data transmission layer to obtain a more matching terminal. A set of candidate precoding matrices of channel states, such that when determining and feeding back CSI, the terminal can make the determined and fed back CSI more closely match the channel state of the terminal than determining and feeding back CSI based only on the precoding matrix set.

Preferably, one implementation manner of the indication information about the arrangement manner of one candidate data transmission layer corresponding to one precoding matrix included in the configuration message may be: the arrangement manner of the candidate data transmission layer is corresponding to all the precoding matrices. An index in a set formed by the arrangement of the candidate data transport layers, wherein each candidate data transport layer corresponding to the precoding matrix may be arranged in an array corresponding to one index in the set.

For example, in some embodiments, the terminal feeds back, to the base station, the index PMI of the precoding matrix in the precoding matrix set and the arrangement of the data transmission layer corresponding to the precoding matrix in the candidate data transmission layer. The index in the permutation collection. The precoding matrix set is a same set pre-configured on the base station and the terminal, and the set of candidate data transport layers may also be an identical set pre-configured on the base station and the terminal.

Preferably, the base station may further receive feedback sent by the terminal for determining whether the data transmission layer is arranged when performing downlink data transmission. If the feedback is needed, the base station determines the precoding matrix according to the CSI, and according to the CSI. After the CSI determines the arrangement of the data transmission layer corresponding to the precoding matrix, the precoding of the downlink data is performed; if the feedback is not required, the base station may determine the precoding matrix according to the CSI. Precoding of downlink data is performed according to the prior art.

As can be seen from the above description, in the channel state information feedback CSI method provided in the embodiment of the present invention, the terminal determines the arrangement manner of the data transmission layer, and then obtains CSI according to the arrangement manner of the data transmission layer, and the terminal feeds back to the base station. The CSI. For the data transmission process, the data transmission effect can be different due to the arrangement of different data transmission layers. The terminal further determines and feeds back the CSI by first determining the arrangement of the data transmission layer, so that the CSI determined and fed back by the terminal is more capable. Reflecting the actual channel state, the CSI fed back by the instant terminal is more closely matched with the channel state of the terminal. At the same time, when determining the arrangement manner of the data transmission layer corresponding to the precoding matrix, the prediction may be determined based on the downlink capacity maximization criterion or the SINR ranking order corresponding to the precoding matrix column vector. The arrangement of the data transmission layers corresponding to the coding matrix enables a larger downlink transmission capacity to be obtained, further improves data transmission efficiency, or makes the detection SINRs of multiple data streams mapped to the same codeword relatively close, and reduces base station modulation. After encoding, some modulation or coding modes of data streams are too high or too low, which improves the efficiency of data transmission.

Based on the same technical concept, the embodiment of the present invention further provides a terminal, where the terminal can perform the foregoing terminal side method embodiment. As shown in FIG. 5, the terminal provided by the embodiment of the present invention includes:

a first determining module 501, configured to determine an arrangement manner of the data transmission layer;

a second determining module 502, configured to obtain CSI according to the arrangement manner of the data transmission layer;

The feedback module 503 is configured to feed back the CSI to the base station.

The first determining module 501 is specifically configured to: determine, from the precoding matrix set, a precoding matrix and an arrangement manner of the data transmission layer corresponding to the precoding matrix.

Specifically, the first determining module 501 is specifically configured to:

Obtaining N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, each precoding matrix corresponding to one or more The arrangement of the candidate data transmission layers, each candidate precoding matrix is determined by using one precoding matrix in the precoding matrix set as the reference matrix and according to the arrangement manner of a candidate data transmission layer corresponding to the reference matrix. And N is an integer greater than or equal to 1; selecting one candidate precoding matrix from the N candidate precoding matrices according to a downlink channel estimation result; and obtaining a reference corresponding to the candidate precoding matrix according to the selected candidate precoding matrix The arrangement of the matrix and the data transmission layer, and the obtained reference matrix is taken as the determined precoding matrix.

The first determining module 501 is further configured to: select, according to the downlink channel estimation result, a precoding matrix from the precoding matrix set as the determined precoding matrix; candidate data corresponding to the selected precoding matrix In the arrangement of the transport layers, an arrangement of data transmission layers is selected.

The first determining module 501 is further configured to: select, according to each of the precoding matrices in the precoding matrix set, an arrangement manner of the data transport layer from the arrangement manner of the candidate data transport layers, as the corresponding one of the precoding matrices The arrangement of the data transmission layers; selecting a precoding matrix as the determined precoding matrix according to the result of the downlink channel estimation and the arrangement of the data transmission layers corresponding to each of the selected precoding matrices.

The first determining module 501 may be specifically configured to: calculate a downlink capacity according to an arrangement manner of each candidate data transmission layer corresponding to the precoding matrix, and select an arrangement manner of a data transmission layer corresponding to a downlink capacity that has the largest value; or The downlink SINR corresponding to each column vector in the precoding matrix is calculated separately, and the calculated downlink SINRs are sequentially arranged, and the data transmission corresponding to the precoding matrix is obtained according to each data transmission layer corresponding to the sorted downlink SINRs. The arrangement of the layers.

Specifically, in the precoding matrix set, the candidate data transmission layers corresponding to different precoding matrices are arranged in the same or different manner.

Preferably, the terminal provided by one embodiment of the present invention may further include:

The receiving module 504 is configured to receive configuration information sent by the base station, where the configuration information includes indication information about an arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set.

Specifically, the configuration information may include indication information of an arrangement manner of the candidate data transmission layers corresponding to all or part of the precoding matrix in the precoding matrix set.

The CSI includes one or more of a precoding matrix index PMI, a rank indication RI, and a channel quality indicator CQI of the determined precoding matrix.

Alternatively, the CSI may also include one or more of PMI, RI, and CQI of the determined precoding matrix, and information about an arrangement manner of the data transmission layer corresponding to the determined precoding matrix.

Specifically, one or more of the PMI, the RI, and the CQI, the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix is separately encoded to obtain the CSI; or, PMI, RI And one or more of the CQIs, the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix is jointly encoded to obtain the CSI.

The embodiment of the invention further provides a base station, which can perform the foregoing base station side method embodiment. The base station provided by the embodiment of the present invention is as shown in FIG. 6, and the base station includes:

The receiving module 601 is configured to receive CSI fed back by the terminal, where the CSI is obtained by the terminal according to an arrangement manner of the data transmission layer;

The determining module 602 is configured to determine, according to the CSI, a precoding matrix used for precoding the data of the terminal.

The determining module 602 is specifically configured to: determine, according to the CSI, a precoding matrix for downlink precoding from a precoding matrix set;

The sending module 603 is configured to send configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.

Specifically, the configuration information may include candidate data corresponding to all or part of the precoding matrix in the precoding matrix. Indicates the arrangement of the transport layer.

Based on the same technical concept, an embodiment of the present invention further provides a terminal, which can implement the CSI feedback process implemented on the terminal side described in the foregoing embodiment.

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention. The terminal may include: a processor 701, a memory 702, a transceiver 703, and a bus interface.

The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 can store data used by the processor 701 in performing operations. The transceiver 703 is configured to receive and transmit data under the control of the processor 701.

The bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 701 and various circuits of memory represented by memory 702. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 703 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 can store data used by the processor 701 in performing operations.

The channel state information CSI feedback flow of the terminal side disclosed in the embodiment of the present invention may be applied to a terminal constituted by the processor 701, the memory 702, the transceiver 703, and the bus interface, or by the processor 701, the memory 702, the transceiver 703, and Terminal implementation of the bus interface. In the implementation process, the steps of the channel state information CSI feedback flow may be completed by the integrated logic circuit of the hardware in the base station formed by the processor 701, the memory 702, the transceiver 703, and the bus interface, or the instruction in the form of software. The processor 701, the memory 702, the transceiver 703, and the bus interface may include a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, and discrete hardware components. The methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or executed. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method on the terminal side disclosed in the embodiment of the present invention may be directly implemented as completion of the terminal, or may be performed by using a combination of hardware and software modules of the terminal. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 702. The processor 701 reads the information in the memory 702, controls the transceiver 703 to receive and transmit data, and completes the steps of the channel state information CSI feedback process in conjunction with the hardware.

Specifically, the terminal composed of the processor 701, the memory 702, the transceiver 703, and the bus interface can perform the following processes:

The processor 701 is configured to determine an arrangement manner of the data transmission layer, and is configured to obtain CSI according to the arrangement manner of the data transmission layer, and is further configured to control the transceiver 703 to feed back the CSI to the base station.

The processor 701 can read the program and data in the memory 702: the processor 701 reads the precoding matrix set from the memory 702, and determines the precoding matrix and the number corresponding to the precoding matrix from the precoding matrix set. According to the arrangement of the transport layer, the processor 701 may further obtain CSI according to the determined precoding matrix and the column vector arrangement manner of the precoding matrix; the processor 701 may further control the transceiver. 703 feeds back the CSI to the base station.

Specifically, the processor 701 may be configured to: obtain N candidate precodings according to a precoding matrix in a precoding matrix set and a candidate data transmission layer corresponding to a precoding matrix in the precoding matrix set. a matrix, each precoding matrix corresponding to an arrangement of one or more candidate data transmission layers, each candidate precoding matrix being obtained by using one precoding matrix in the precoding matrix set as a reference matrix and corresponding to the reference matrix An arrangement of the candidate data transmission layers is determined, where N is an integer greater than or equal to 1; according to the downlink channel estimation result, one candidate precoding matrix is selected from the N candidate precoding matrices; according to the selected candidate The precoding matrix obtains an arrangement manner of the reference matrix and the data transmission layer corresponding to the candidate precoding matrix, and uses the obtained reference matrix as the determined precoding matrix.

Specifically, the processor 701 is specifically configured to: select, according to a downlink channel estimation result, a precoding matrix from the precoding matrix set as the determined precoding matrix; candidate data corresponding to the selected precoding matrix. In the arrangement of the transport layers, an arrangement of data transmission layers is selected.

Specifically, the processor 701 may be configured to: select, according to an arrangement manner of each of the candidate data transmission layers, each of the precoding matrices in the precoding matrix set, as an arrangement manner of the precoding matrix. The arrangement of the data transmission layers; selecting a precoding matrix as the determined precoding matrix according to the result of the downlink channel estimation and the arrangement of the data transmission layers corresponding to each of the selected precoding matrices.

Specifically, the processor 701 may select, for one precoding matrix, an arrangement of the data transmission layers from the arrangement of the candidate data transmission layers corresponding to the precoding matrix.

Calculating the downlink capacity according to the arrangement manner of each candidate data transmission layer corresponding to the precoding matrix, and selecting the arrangement manner of the data transmission layer corresponding to the downlink capacity with the largest value; or respectively calculating each column vector corresponding to the precoding matrix The downlink signal and the interference plus noise ratio SINR are sequentially arranged, and the data transmission layer corresponding to the precoding matrix is obtained according to the arrangement manner of the data transmission layer corresponding to the sorted downlink SINR. .

Preferably, the processor 701 is further configured to receive, by the transceiver 703, the configuration information that is sent by the base station, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set.

The CSI may include one or more of a PMI, an RI, and a CQI; or the CSI may also include one or more of a PMI, an RI, and a CQI, and the determined precoding matrix corresponding to the CSI. Information about the arrangement of the data transfer layers.

The one or more of the PMI, the RI, and the CQI may be separately encoded by the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix to obtain the CSI; or, PMI, RI And one or more of the CQIs, the information about the arrangement manner of the data transmission layer corresponding to the determined precoding matrix is jointly encoded to obtain the CSI.

Based on the same technical concept, the embodiment of the present invention further provides a base station, which can implement the channel state information CSI feedback process implemented on the base station side described in the foregoing embodiment.

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station may include: a processor 801, a memory 802, a transceiver 803, and a bus interface.

The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations. The transceiver 803 is configured to receive and transmit data under the control of the processor 801.

The bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 801 and various circuits of memory represented by memory 802. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 803 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations.

The channel state information CSI feedback flow of the base station side disclosed in the embodiment of the present invention may be applied to a base station formed by the processor 801, the memory 802, the transceiver 803, and the bus interface, or by the processor 801, the memory 802, and the transceiver 803. And base station implementation of the bus interface. In the implementation process, the steps of the channel state information CSI feedback flow may be completed by the integrated logic circuit of the hardware in the base station formed by the processor 801, the memory 802, the transceiver 803, and the bus interface, or the instruction in the form of software. The processor 801, the memory 802, the transceiver 803, and the bus interface may include a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, and discrete hardware components. The methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or executed. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method on the base station side disclosed in the embodiment of the present invention may be directly implemented as completion of the base station, or may be performed by using a combination of hardware and software modules of the base station. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 802. The processor 801 reads the information in the memory 802, controls the transceiver 803 to receive and transmit data, and completes the steps of the channel state information CSI feedback process in conjunction with the hardware. Specifically, the base station composed of the processor 801, the memory 802, the transceiver 803, and the bus interface can perform the process of the channel state information CSI feedback method embodiment described above on the base station side.

In summary, in the above embodiment of the present invention, the terminal determines the arrangement manner of the data transmission layer, and then according to the number According to the arrangement of the transport layers, CSI is obtained, and the terminal feeds back the CSI to the base station. It can be seen that the embodiments of the present invention can improve the matching degree of CSI and channel state fed back by the terminal.

For software implementations, these techniques can be implemented with modules (eg, programs, functions, etc.) that implement the functions described herein. The software code can be stored in a memory unit and executed by the processor. The memory unit can be implemented within the processor or external to the processor.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

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 onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

A channel state information CSI feedback method, the method comprising:

The terminal determines an arrangement manner of the data transmission layer;

The terminal obtains CSI according to the arrangement manner of the data transmission layer;

The terminal feeds back the CSI to a base station.
The method according to claim 1, wherein the data transmission layer is arranged in a column vector arrangement manner of a precoding matrix used by the data transmission layer, or a mapping manner of a code word to the data transmission layer, or The order in which the data transfer layers are arranged.
The method of claim 1, wherein the terminal determines the arrangement of the data transmission layer, including:

The terminal determines the precoding matrix and the arrangement of the data transmission layers corresponding to the precoding matrix from the precoding matrix set.
The method according to claim 3, wherein the terminal determines a precoding matrix and a data transmission layer corresponding to the precoding matrix from the precoding matrix set, and includes:

The terminal obtains N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, and each precoding matrix corresponds to one Arrangement of one or more candidate data transmission layers, each candidate precoding matrix being arranged by using one precoding matrix in the precoding matrix set as a reference matrix and according to a candidate data transmission layer corresponding to the reference matrix Determined, N is an integer greater than or equal to 1;

The terminal selects one candidate precoding matrix from the N candidate precoding matrices according to the downlink channel estimation result;

The terminal obtains an arrangement manner of the reference matrix and the data transmission layer corresponding to the candidate precoding matrix according to the selected candidate precoding matrix, and uses the obtained reference matrix as the determined precoding matrix.
The method according to claim 3, wherein the terminal determines a precoding matrix and a data transmission layer corresponding to the precoding matrix from the precoding matrix set, and includes:

The terminal selects a precoding matrix from the precoding matrix set as the determined precoding matrix according to the downlink channel estimation result;

The terminal selects an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers corresponding to the selected precoding matrix.
The method according to claim 3, wherein the terminal determines a precoding matrix and a data transmission layer corresponding to the precoding matrix from the precoding matrix set, and includes:

Each of the precoding matrices in the precoding matrix set selects an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers as an arrangement manner of the data transmission layer corresponding to the precoding matrix;

The terminal according to the result of the downlink channel estimation, and the selected data transmission layer corresponding to each precoding matrix The arrangement is performed by selecting a precoding matrix as the determined precoding matrix.
The method according to claim 3, wherein the terminal obtains CSI according to the arrangement of the data transmission layer, and includes:

The terminal obtains CSI according to determining a precoding matrix from the precoding matrix set and an arrangement manner of the data transmission layer corresponding to the precoding matrix.
The method of claim 1 further comprising:

The terminal receives configuration information sent by the base station, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.
The method according to claim 8, wherein the terminal determines an arrangement of the data transmission layer, including:

If the terminal determines that there is only one type of arrangement of the candidate data transmission layer according to the indication information of the arrangement manner of the candidate data transmission layers included in the configuration information, the terminal arranges the data transmission layer As a way of determining the data transmission layer.
The method according to claim 1, further comprising: the terminal feeding back information of the arrangement of the data transmission layer to the base station.
The method according to claim 1, wherein the CSI includes one or more of a precoding matrix index PMI, a rank indication RI, and a channel quality indicator CQI.
A channel state information CSI feedback method, the method comprising:

Receiving, by the base station, the CSI fed back by the terminal, where the CSI is obtained by the terminal according to the determined arrangement of the data transmission layer;

Determining, by the base station, a precoding matrix for precoding data of the terminal according to the CSI.
The method according to claim 12, wherein the data transmission layer is arranged in a column vector arrangement manner of a precoding matrix used by the data transmission layer, or a mapping manner of a code word to the data transmission layer, or The order in which the data transfer layers are arranged.
The method according to claim 12, wherein the base station determines, according to the CSI, a precoding matrix for precoding data of the terminal, including:

Determining, by the base station, a precoding matrix for downlink precoding from a precoding matrix set according to the CSI;

Determining, by the base station, an arrangement manner of the data transmission layer corresponding to the precoding matrix according to an arrangement manner of the data transmission layer fed back by the terminal, or an arrangement manner of the data transmission layer determined by the base station;

Determining, by the base station, a precoding matrix for precoding data of the terminal according to the determined precoding matrix and an arrangement manner of a data transmission layer corresponding to the precoding matrix.
The method of any of claims 12 to 14, further comprising:

Transmitting, by the base station, configuration information to a terminal, where the configuration information includes a reference manner of a candidate data transmission layer Show information.
A terminal, the terminal comprising:

a first determining module, configured to determine an arrangement manner of the data transmission layer;

a second determining module, configured to obtain CSI according to the arrangement manner of the data transmission layer;

And a feedback module, configured to feed back the CSI to the base station.
The terminal according to claim 16, wherein the data transmission layer is arranged in a column vector arrangement manner of a precoding matrix used by the data transmission layer, or a mapping manner of a code word to the data transmission layer, or The order in which the data transfer layers are arranged.
The terminal according to claim 16, wherein the first determining module is specifically configured to:

The precoding matrix and the arrangement of the data transmission layers corresponding to the precoding matrix are determined from the precoding matrix set.
The terminal according to claim 18, wherein the first determining module is specifically configured to:

Obtaining N candidate precoding matrices according to the arrangement manner of the candidate data transmission layers corresponding to the precoding matrix in the precoding matrix set and the precoding matrix in the precoding matrix set, each precoding matrix corresponding to one or more The arrangement of the candidate data transmission layers, each candidate precoding matrix is determined by using one precoding matrix in the precoding matrix set as the reference matrix and according to the arrangement manner of a candidate data transmission layer corresponding to the reference matrix. , N is an integer greater than or equal to 1;

Selecting a candidate precoding matrix from the N candidate precoding matrices according to a downlink channel estimation result;

Obtaining a reference matrix corresponding to the candidate precoding matrix and a data transmission layer according to the selected candidate precoding matrix, and using the obtained reference matrix as the determined precoding matrix.
The terminal according to claim 18, wherein the first determining module is specifically configured to:

Selecting, according to a downlink channel estimation result, a precoding matrix from the precoding matrix set as the determined precoding matrix;

An arrangement of the data transmission layers is selected from the arrangement of the candidate data transmission layers corresponding to the selected precoding matrix.
The terminal according to claim 18, wherein the first determining module is specifically configured to:

Selecting, by each of the precoding matrices in the precoding matrix set, an arrangement manner of the data transmission layer from the arrangement manner of the candidate data transmission layers as a column vector arrangement manner corresponding to the precoding matrix;

And selecting, according to a result of the downlink channel estimation, and the selected arrangement of the data transmission layer corresponding to each precoding matrix, a precoding matrix as the determined precoding matrix.
The terminal according to claim 18, wherein the second determining module is specifically configured to:

The CSI is obtained according to determining the precoding matrix from the precoding matrix set and the arrangement of the data transmission layers corresponding to the precoding matrix.
The terminal of claim 16, further comprising:

The receiving module is configured to receive configuration information sent by the base station, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.
The terminal according to claim 16, wherein the CSI includes one or more of the PMI, RI, and CQI.
A base station, characterized in that the base station comprises:

a receiving module, configured to receive CSI fed back by the terminal, where the CSI is obtained by the terminal according to the determined arrangement of the data transmission layer;

And a determining module, configured to determine, according to the CSI, a precoding matrix used for precoding the data of the terminal.
The base station according to claim 25, wherein the data transmission layer is arranged in a column vector arrangement manner of a precoding matrix used by the data transmission layer, or a mapping manner of a code word to the data transmission layer, or The order in which the data transfer layers are arranged.
The base station according to claim 25, wherein the determining module is specifically configured to:

Determining, from the precoding matrix set, a precoding matrix for downlink precoding according to the CSI;

Determining, according to an arrangement manner of the data transmission layer fed back by the terminal, or an arrangement manner of the data transmission layer determined by the base station, an arrangement manner of the data transmission layer corresponding to the precoding matrix;

And determining, according to the determined precoding matrix and the arrangement manner of the data transmission layer corresponding to the precoding matrix, a precoding matrix used for precoding the data of the terminal.
The base station according to any one of claims 25 to 27, further comprising:

The sending module is configured to send configuration information to the terminal, where the configuration information includes indication information of an arrangement manner of the candidate data transmission layers.