CN106160934B - A kind of CSI feedback method, apparatus and relevant device - Google Patents

Abstract

The invention discloses a CSI feedback method, device and related equipment, which are used to ensure the coverage of the CSI-RS while reducing the CSI-RS overhead. The CSI feedback method implemented by the network side includes: sending channel state information reference signal CSI-RS configuration information to the user equipment UE, the CSI-RS configuration information including the vertical dimension CSI-RS and 2N of the B port configured for the UE The horizontal dimension CSI-RS of the port; receiving the channel state information CSI feedback information sent by the UE, the CSI feedback information includes the vertical dimension determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port The CSI‑RS port identifier and the rank indication RI and the horizontal dimension precoding matrix PMI determined by the measurement results of the horizontal dimension CSI‑RS of the 2N ports.

Description

A CSI feedback method, device and related equipment

technical field

The present invention relates to the technical field of wireless communication, in particular to a CSI feedback method, device and related equipment.

Background technique

In the LTE-Advanced (Long Term Evolution-Advanced, Advanced Long Term Evolution) system, a CSI-RS (Channel State Information-Reference Signal, Channel State Information-Reference Signal) is defined. The CSI-RS is a downlink pilot signal, which is a known signal provided by the transmitting end to the receiving end for useful signal channel measurement. Channel state information (Channel State Information, CSI) feedback can be divided into periodic feedback mode and aperiodic feedback mode, wherein, CSI consists of rank indicator (Rank Indicator, RI), precoding matrix indicator (PrecodingMatrixIndicator, PMI) and channel quality indicator ( Channel Quality Indicator, CQI) composition. Among them, aperiodic CSI feedback, the system workflow is as follows:

1. The base station triggers the user to measure the CSI-RS in a downlink subframe and sends the CSI-RS;

2. The terminal obtains the trigger message, and measures the CSI-RS signal in the corresponding subframe to estimate the useful signal quality;

3. The terminal determines the channel state information according to the useful signal quality;

4. The terminal delays at least K subframes, and feeds back channel state information on available uplink subframes (where K refers to the processing time for the terminal to calculate CSI);

5. The base station receives the CSI fed back by the terminal in the corresponding uplink subframe.

3D-MIMO (3Dimensions Multiple-Input Multiple-Out-put, 3-dimensional multiple-input multiple-output) technology is a topic being discussed in 3GPP RAN1. 3D-MIMO mainly uses two-dimensional array antennas, which can be described by the following parameters (M, N, P, Q), where M represents the number of dipoles of a column of antennas with the same polarization, N represents the number of columns of the antenna array, P=2 represents the use of dual-polarized antennas, and M _TXRU represents the number of transceiver channels corresponding to the same column of antennas , a transceiver channel may correspond to several antenna elements, Q=2N*M _TXRU indicates the total number of TXRU contained in the TXRU array corresponding to the antenna array, for example, (M, N, P, M _TXRU )=(8, 4, 2, 4) The corresponding antenna array can be represented by Figure 1 (left), and the corresponding Q=32, the TXRU array can be represented by Figure 1 (right), and TXRU#(m _TXRU , n _TXRU ) represents a certain TXRU.

CSI feedback enhancement is an important topic in 3D-MIMO, and there are currently three main solutions.

Solution 1: CSI feedback based on Full port CSI-RS (all CSI-RS ports). In this solution, the number of CSI-RS ports is equal to the number of TXRUs, and there is a one-to-one mapping relationship, as shown in FIG. 2 . With this solution, the UE can estimate the most comprehensive channel information, that is, the UE can obtain channel information between the UE and all transmit antenna ports. However, when using this scheme, on the one hand, the overhead of CSI-RS is large. Currently, the overhead of 8-port CSI-RS ports in LTE is about 1.5%. The goal of 3D-MIMO is to support a maximum of 64 TXRUs, and the corresponding 64port CSI-RS The overhead of TXRU is about 12%. On the other hand, when the total transmission power is guaranteed to be constant, the larger the number of TXRUs, the smaller the transmission power of a single CSI-RS, resulting in limited CSI-RS coverage.

Solution 2: Based on the CSI feedback of Partial port CSI-RS (partial CSI-RS port), this solution uses two sets of independent CSI-RS, and the number of ports of one set of CSI-RS is 2N, which are mapped to one of the TXRU arrays one by one. The 2N TXRUs in one row and the number of M _TXRU ports in another set of CSI-RS are mapped to the M _{TXRU TXRUs} in a column of the TXRU array one by one, as shown in FIG. 3 . Using this scheme, although the CSI-RS overhead is small, taking (M,N,P,M _TXRU )=(8,4,2,8) as an example, the CSI-RS overhead of this scheme is about 3%. However, a On the one hand, the UE can only estimate part of the channel information. Specifically, the UE can only obtain the channel between the UE and a certain row/column of transmitting antenna ports, and the channels of other antenna ports need to be estimated based on information such as the distance between antenna elements; on the other hand, Under the condition that the total transmission power is guaranteed to be constant, the larger the number of TXRUs, the smaller the transmission power of a single CSI-RS, resulting in limited coverage of the CSI-RS.

Scheme 3: CSI feedback based on Beamformed CSI-RS (beamformed CSI-RS). In this scheme, the CSI-RS has undergone vertical beamforming, and the same column The M _TXRUs of TXRU are mapped to B vertical beams, and each vertical beam corresponds to a set of CSI-RS (the number of ports in each set is 2N), so there are B sets of CSI-RS, as shown in Figure 4. With this scheme, each CSI-RS port has undergone vertical beamforming, and the coverage performance of CSI-RS is better; however, since the base station needs to select an appropriate beam (beam), if the selected beam is not suitable, it will As a result, the quality of the CSI-RS signal received by the user deteriorates, which affects channel estimation. Among them, the selection of the Beam can be realized entirely by the base station, or by means of feedback from the UE. If it is completely based on the base station, typically based on long-term uplink and downlink channel reciprocity, the Beam selection accuracy may be poor, and it is difficult to support frequency-domain selective scheduling; if feedback from the UE is used, based on existing standards, it is necessary Configure multiple CSI-processes for the user, corresponding to multiple vertical dimension beams, and the user needs to complete the CSI feedback of multiple CSI-processes within a time period to help the base station perform beam selection. The more CSI-processes are configured, the shorter the feedback period is, and the higher the CSI-RS overhead is. Taking 4 beams in the vertical dimension, (M, N, P, M _TXRU )=(8, 4, 2, 8), and a feedback cycle of 5 ms as an example, the overhead of the CSI-RS is about 6%.

It can be seen that in the existing CSI feedback methods based on CSI-RS, either the CSI-RS overhead is large, or the coverage performance of CSI-RS is poor. How to reduce the CSI-RS overhead while ensuring the CSI-RS coverage? Coverage has become one of the technical problems to be solved urgently in the prior art.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a CSI feedback method, device and related equipment, which are used to ensure CSI-RS coverage while reducing CSI-RS overhead.

An embodiment of the present invention provides a CSI feedback method implemented on the network side, including:

Send channel state information CSI-RS configuration information to the user equipment UE, the CSI-RS configuration information includes the vertical dimension channel state information reference signal CSI-RS of the B port configured for the UE and the horizontal dimension CSI-RS of the 2N port , where B is a preset value, and N is the number of columns of the dual-polarized antenna array;

Receive the CSI feedback information sent by the UE, the CSI feedback information includes the vertical dimension CSI-RS port identifier determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port and the horizontal dimension of the 2N port The rank indicator RI and the horizontal dimension precoding matrix PMI are determined from the measurement results of the dimension CSI-RS.

Send the vertical dimension CSI-RS of the B port to the UE according to the following method:

Using B groups of vertical beamforming weights to form B vertical beams that correspond one-to-one to the B vertical dimension CSI-RS ports;

Each vertical dimension CSI-RS port is mapped to at least one resource element RE of the time-frequency resource and sent.

Before mapping each vertical dimension CSI-RS port to at least one RE of the time-frequency resource and sending it, it also includes:

Each row of antennas in the antenna array is shaped using a preset set of broadcast shaping weights in the horizontal dimension.

Send the horizontal dimension CSI-RS of 2N ports to the UE according to the following method:

The configured horizontal dimension CSI-RSs of 2N ports are respectively mapped to at least one RE and sent.

Before mapping the horizontal dimension CSI-RS of the configured 2N ports to at least one RE before sending, it also includes:

In the vertical dimension, a set of preset vertical broadcast shaping weights is used to shape each column of antennas in the antenna array.

The CSI feedback method implemented by the network side further includes:

Determine a vertical dimension precoding matrix according to the port identifier of the vertical dimension CSI-RS;

Determine the horizontal dimension precoding matrix according to the RI and the horizontal dimension PMI;

A precoding matrix for sending a physical downlink shared channel PDSCH is generated according to the vertical dimension precoding matrix and the horizontal dimension precoding matrix.

An embodiment of the present invention provides a CSI feedback device, including:

A sending unit, configured to send channel state information reference signal CSI-RS configuration information to the user equipment UE, where the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI of the 2N port configured for the UE -RS, wherein, B is a preset value, and N is the number of columns of the dual-polarized antenna array;

A receiving unit, configured to receive channel state information CSI feedback information sent by the UE, where the CSI feedback information includes the vertical dimension CSI-RS determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port The rank indication RI and the horizontal dimension precoding matrix PMI determined by the port identifier and the measurement result of measuring the horizontal dimension CSI-RS of the 2N ports.

The sending unit is specifically configured to use B groups of vertical beamforming weights to form B vertical beams that correspond one-to-one to the B vertical dimension CSI-RS ports; map each vertical dimension CSI-RS port to time sent on at least one resource element RE of the frequency resource.

The sending unit is further configured to map each CSI-RS port in the vertical dimension to at least one RE of the time-frequency resource for transmission, and use a preset set of broadcast shaping weights in the horizontal dimension for each of the CSI-RS ports in the antenna array The row antenna is shaped.

The sending unit is specifically configured to respectively map the configured horizontal dimension CSI-RS of 2N ports to at least one RE for sending.

The sending unit is specifically configured to map the configured horizontal-dimension CSI-RS of 2N ports to at least one RE respectively before sending, and use a preset set of vertical broadcast shaping weights in the vertical dimension for each of the antenna arrays A column of antennas is shaped.

The CSI feedback device also includes:

A determining unit, configured to determine a vertical dimension precoding matrix according to the port identifier of the vertical dimension CSI-RS; determine a horizontal dimension precoding matrix according to the RI and the horizontal dimension PMI; and determine the vertical dimension precoding matrix and the horizontal dimension The precoding matrix generates a precoding matrix for sending the physical downlink shared channel PDSCH.

An embodiment of the present invention provides a base station, including the above CSI feedback apparatus.

An embodiment of the present invention provides a CSI feedback method implemented on the user equipment side, including:

Receive channel state information reference signal CSI-RS configuration information, the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port, where B is a preset value and N is a bipolar The number of columns of the antenna array;

Feedback the vertical dimension CSI-RS port identifier according to the measurement result of measuring the vertical dimension CSI-RS of the B port;

The rank indicator RI and the horizontal dimension precoding matrix PMI are fed back according to the measurement result of the horizontal dimension CSI-RS of the 2N port.

Wherein, the vertical dimension CSI-RS port identifier is fed back according to the measurement result of the vertical dimension CSI-RS of the B port according to the following method:

The received signal strength of each vertical dimension CSI-RS port is measured, and the vertical dimension CSI-RS port identifier with the highest received signal strength is fed back.

An embodiment of the present invention provides a user equipment, including:

A receiving unit, configured to receive channel state information reference signal CSI-RS configuration information, where the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port;

a measuring unit, configured to respectively measure the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port;

A feedback unit, configured to feed back the vertical dimension CSI-RS port identifier according to the measurement result of the vertical dimension CSI-RS of the B port; and feedback according to the measurement result of the horizontal dimension CSI-RS of the 2N port Rank indication RI and horizontal dimension precoding matrix PMI.

The measuring unit is specifically used to measure the received signal strength of each vertical dimension CSI-RS port;

The feedback unit is specifically configured to feed back the vertical dimension CSI-RS port identifier with the highest received signal strength.

An embodiment of the present invention provides a CSI feedback system, including the above-mentioned base station and user equipment.

In the CSI feedback method, device and related equipment provided by the embodiments of the present invention, the network side configures two sets of independent CSI-RSs for the user equipment, and the UE measures the two sets of CSI-RSs configured on the network side respectively, according to the vertical dimension The measurement results of the CSI-RS are fed back to the network side in the vertical dimension port identifier, and the RI and horizontal PMI are fed back to the network side according to the measurement results of the horizontal dimension CSI-RS. While reducing the CSI-RS overhead, the CSI can be guaranteed - Coverage of RS.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached image:

FIG. 1 is a schematic diagram of an antenna array and a TXRU array in the prior art;

FIG. 2 is a schematic diagram of the mapping between the number of CSI-RS ports and TXRU in scheme 1 in the prior art;

FIG. 3 is a schematic diagram of the mapping between the number of CSI-RS ports and TXRU in scheme 2 in the prior art;

FIG. 4 is a schematic diagram of the mapping between the number of CSI-RS ports and TXRU in scheme three in the prior art;

FIG. 5 is a schematic diagram of an implementation flow of a CSI feedback method implemented by the network side in an embodiment of the present invention;

FIG. 6 is a schematic diagram of vertical dimension CSI-RS transmission in an embodiment of the present invention;

7 is a schematic structural diagram of a CSI feedback device in an embodiment of the present invention;

FIG. 8 is a schematic diagram of an implementation flow of a user equipment implementing a CSI feedback method in an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a user equipment in an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a CSI feedback system in an embodiment of the present invention.

Detailed ways

In order to ensure coverage of CSI-RS while reducing CSI-RS overhead, embodiments of the present invention provide a CSI feedback method, device and related equipment.

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention, and in the absence of conflict, the present invention The embodiments and the features in the embodiments can be combined with each other.

As shown in FIG. 5, it is a schematic diagram of the implementation flow of the network side implementation of the CSI feedback method provided by the embodiment of the present invention, including the following steps:

S51. Send CSI-RS configuration information to the UE.

Among them, the CSI-RS configuration information includes the vertical dimension CSI-RS (channel state information reference signal) (V-CSI-RS) of the B port configured for the UE (User Equipment, User Equipment) and the horizontal dimension CSI-RS of the 2N port (H-CSI-RS).

Wherein, the port identifiers of the V-CSI-RS are respectively {1, 2, 3..., B}, B is a preset value, and its value can be determined according to actual needs, and N is the number of columns of the dual-polarized antenna array.

S52. Receive CSI feedback information sent by the UE.

The CSI feedback information includes the vertical dimension CSI-RS port identifier determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port and the measurement result of the horizontal dimension CSI-RS of the 2N port. RI and horizontal PMI.

Specifically, the UE measures the V-CSI-RS configured on the network side, and identifies the port of the V-CSI-RS with the highest signal strength to the network side according to the measurement result. And the UE measures the H-CSI-RS configured on the network side, and feeds back the RI, horizontal PMI and CQI to the network side according to the measurement result. The network side determines the vertical dimension precoding matrix W _V according to the V-CSI-RS port identifier fed back by the UE, determines the horizontal dimension precoding matrix W _H according to the RI fed back by the UE and the horizontal dimension PMI, and determines the vertical dimension precoding matrix W _V and the horizontal dimension PMI dimensional precoding matrix W _H generates a precoding matrix for sending PDSCH (Physical Downlink Shared Channel). Preferably, the network can generate the final precoding matrix through the Kroneck product

During specific implementation, the network side can send the V-CSI-RS of the B port configured for the UE in the following way: using the preset B group with different vertical beamforming weights Form B vertical beams that correspond one-to-one to the B vertical dimension CSI-RS ports, and the vertical dimension CSI-RS ports after each beamforming are respectively mapped to at least one RE (resource element) of the time-frequency resource for transmission, B The vertical dimension CSI-RS after beamforming together constitute a set of V-CSI-RS, in which, the different vertical beamforming weights of group B can be static, semi-static or dynamic adjustment to adapt to the cell The spatial distribution of internal users can enhance the accuracy of beam selection.

For example, the vertical dimension CSI-RS after each beamforming can be mapped to one RE of the time-frequency resource, as shown in Figure 6, which is a schematic diagram of resource mapping when B=4, and R1 indicates that the vertical dimension passes The shaped CSI-RS corresponds to vertical beam 1, and R2 indicates that the vertical dimension passes through The shaped CSI-RS corresponds to vertical beam 2, and so on, there are 4 CSI-RSs, which correspond to 4 vertical beams respectively, and each PRB occupies 4 REs in total.

More preferably, in order to further enhance the coverage performance of the CSI-RS in the vertical dimension, a set of preset horizontal broadcast weighting values W _H,Broad =[w ₁ ,w ₂ ,…,w _2N ] can be used in the horizontal dimension to The 2N antennas in each row in the two-dimensional antenna array are shaped to enhance the coverage of the CSI-RS. The horizontal broadcast weighting value can be static, or semi-static or dynamically adjusted, so as to adapt to the spatial distribution of users in the cell, so as to further enhance the coverage performance of the CSI-RS.

For the horizontal dimension CSI-RS of 2N ports configured for the UE, the configured horizontal dimension CSI-RS of 2N ports may be respectively mapped to at least one RE for transmission. When N=2/4/8, the design of horizontal dimension CSI-RS before R12 can be reused.

Preferably, in order to enhance the coverage performance of the CSI-RS, a set of preset vertical broadcast weights W _V,Broad =[w ₁ ,w ₂ ,…,w _MTXRU ] can be used in the vertical dimension to combine the two-dimensional antenna M _TXRU antennas in each column in the array are shaped to enhance CSI-RS coverage. Wherein, the vertical broadcast weighting value can be static, and can also be adjusted semi-statically or dynamically, so as to adapt to the spatial distribution of users in the cell and further enhance the coverage performance of the CSI-RS.

The CSI feedback method provided by the embodiment of the present invention configures two sets of independent CSI-RS for the UE respectively, including a set of B-port vertical dimension beamformed CSI-RS and a set of 2N-port horizontal dimension non-precoded (not precoded) CSI-RS, after the UE measures the vertical dimension CSI-RS of the B port, according to the measurement result, it feeds back the best vertical dimension port identifier to the network side, and the UE measures the horizontal dimension CSI of the 2N port - After the RS performs the measurement, it feeds back the RI and the horizontal PMI to the network side according to the measurement result. Compared with the first scheme in the prior art, it can not only reduce the CSI-RS overhead, but also enhance the coverage performance of the CSI-RS. Compared with the second scheme in the prior art, it can enhance the CSI-RS For coverage performance, compared with the third solution in the prior art, it can reduce the overhead of the CSI-RS, so that while reducing the overhead of the CSI-RS, the coverage performance of the CSI-RS is guaranteed.

Based on the same inventive concept, embodiments of the present invention also provide a CSI feedback device, a CSI feedback method implemented by base stations and user equipment, and user equipment and systems. The feedback methods are similar, so the implementation of the above method, apparatus and equipment can refer to the implementation of the CSI feedback method on the network side, and repeated descriptions will not be repeated.

As shown in FIG. 7, it is a schematic structural diagram of a CSI feedback device provided by an embodiment of the present invention, including:

The sending unit 71 is configured to send CSI-RS configuration information to the user equipment UE.

The CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N ports configured for the UE, where B is a preset value and N is the column number of the dual-polarized antenna array.

The receiving unit 72 is configured to receive CSI feedback information sent by the UE.

The CSI feedback information includes the vertical dimension CSI-RS port identifier determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port and the rank indicator determined by the measurement result of the horizontal dimension CSI-RS measurement of the 2N port RI and horizontal dimension precoding matrix PMI.

Wherein, the sending unit 71 can be used to form B vertical beams corresponding to the B vertical CSI-RS ports one-to-one by using preset B groups of vertical beamforming weights; each vertical CSI-RS The ports are respectively mapped to at least one resource element RE of the time-frequency resource for sending.

Preferably, the sending unit 71 can also be used to map each vertical dimension CSI-RS port to at least one RE of the time-frequency resource before sending, using a preset set of broadcast shaping weights in the horizontal dimension to pair the antenna array Each row of antennas in is shaped.

During specific implementation, the sending unit 71 may be configured to respectively map the configured horizontal dimension CSI-RS of 2N ports to at least one RE for sending. Preferably, the sending unit 71 can also be used to map the horizontal dimension CSI-RS of the configured 2N ports to at least one RE before sending, use a set of preset vertical broadcast shaping weights in the vertical dimension to pair the antenna array Each column of antennas in is shaped.

During specific implementation, the CSI feedback device provided by the embodiment of the present invention may further include a determining unit, configured to determine the vertical dimension precoding matrix according to the port identifier of the vertical dimension CSI-RS; determine the horizontal dimension precoding matrix according to the RI and the horizontal dimension PMI matrix; and generating a precoding matrix for sending the PDSCH according to the vertical dimension precoding matrix and the horizontal dimension precoding matrix.

For the convenience of description, the above parts are divided into modules (or units) according to their functions and described separately. Certainly, when implementing the present invention, the functions of each module (or unit) can be implemented in one or more pieces of software or hardware.

During specific implementation, the above CSI feedback apparatus may be set in a base station, and the base station implements the above provided CSI feedback method.

As shown in FIG. 8, a schematic diagram of an implementation process of implementing a CSI feedback method for a user equipment may include the following steps:

S81. Receive CSI-RS configuration information.

Wherein, the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N ports, wherein, B is a preset value, and N is the column number of the dual-polarized antenna array.

S82. Feed back the vertical dimension CSI-RS port identifier according to the measurement result of the vertical dimension CSI-RS of the B port.

Specifically, the user equipment respectively measures the received signal strength of each vertical-dimension CSI-RS port, and feeds back the identifier of the vertical-dimension CSI-RS port with the highest received signal strength to the network side.

S83. Feed back the RI and the horizontal dimension PMI according to the measurement result of the horizontal dimension CSI-RS of the 2N port.

It should be noted that, during specific implementation, steps S82 and S83 are not performed sequentially, and step S83 may also be performed prior to step S82.

As shown in FIG. 9, it is a schematic structural diagram of a user equipment provided in an embodiment of the present invention, including:

The receiving unit 91 is configured to receive CSI-RS configuration information.

Wherein, the CSI-RS configuration information includes the vertical dimension number CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port, wherein, B is a preset value, and N is the column number of the dual-polarized antenna array.

The measurement unit 92 is configured to measure the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port respectively;

The feedback unit 93 is configured to feed back the vertical dimension CSI-RS port identifier according to the measurement result of the vertical dimension CSI-RS of the B port; and feed back RI and horizontal dimension according to the measurement result of the horizontal dimension CSI-RS of the 2N port. dimension PMI.

Wherein, the measurement unit 92 may be used to measure the received signal strength of each vertical dimension CSI-RS port; the feedback unit 93 may be used to feed back the identifier of the vertical dimension CSI-RS port with the highest received signal strength.

For the convenience of description, the above parts are divided into modules (or units) according to their functions and described separately. Certainly, when implementing the present invention, the functions of each module (or unit) can be implemented in one or more pieces of software or hardware.

As shown in FIG. 10 , it is a schematic structural diagram of a CSI feedback system provided by an embodiment of the present invention, including a base station 101 and the above-mentioned user equipment 102, wherein the above-mentioned CSI feedback apparatus is set in the base station.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may 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.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (15)

1. A CSI feedback method, characterized in that, comprising: Send channel state information reference signal CSI-RS configuration information to the user equipment UE, the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port configured for the UE, wherein, B is a preset value, and N is the number of columns of the dual-polarized antenna array, wherein, the vertical dimension CSI-RS of the B port is sent to the UE according to the following method: in the vertical dimension, using the B group of vertical beamforming weights to form B vertical beams corresponding to B vertical dimension CSI-RS ports one-to-one; each vertical dimension CSI-RS port is mapped to at least one resource element RE of the time-frequency resource for transmission; Receive the channel state information CSI feedback information sent by the UE, the CSI feedback information includes the vertical dimension CSI-RS port identifier determined by the UE according to the measurement result of the vertical dimension CSI-RS of the B port and the 2N The rank indicator RI and the horizontal dimension precoding matrix PMI determined by the measurement result of the horizontal dimension CSI-RS of the port. 2. The method according to claim 1, wherein before mapping each vertical dimension CSI-RS port to at least one RE of a time-frequency resource and sending it, further comprising: Each row of antennas in the antenna array is shaped using a preset set of broadcast shaping weights in the horizontal dimension. 3. The method according to claim 1, wherein the horizontal dimension CSI-RS of 2N ports is sent to the UE according to the following method: The configured horizontal dimension CSI-RSs of 2N ports are respectively mapped to at least one RE and sent. 4. The method according to claim 3, further comprising: before mapping the horizontal dimension CSI-RS of the configured 2N ports to at least one RE and sending them respectively: In the vertical dimension, a set of preset vertical broadcast shaping weights is used to shape each column of antennas in the antenna array. 5. The method of claim 1, further comprising: Determine a vertical dimension precoding matrix according to the port identifier of the vertical dimension CSI-RS; Determine the horizontal dimension precoding matrix according to the RI and the horizontal dimension PMI; A precoding matrix for sending a physical downlink shared channel PDSCH is generated according to the vertical dimension precoding matrix and the horizontal dimension precoding matrix. 6. A CSI feedback device, characterized in that, comprising: A sending unit, configured to send channel state information reference signal CSI-RS configuration information to the user equipment UE, where the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI of the 2N port configured for the UE -RS, which is specifically used to use B groups of vertical beamforming weights to form B vertical beams corresponding to B vertical dimension CSI-RS ports one-to-one; map each vertical dimension CSI-RS port to time-frequency resources respectively Send on at least one resource element RE of , where B is a preset value, and N is the number of columns of a dual-polarized antenna array; a receiving unit, configured to receive the CSI feedback information sent by the UE, where the CSI feedback information includes the vertical dimension CSI-RS port identifier and The rank indicator RI and the horizontal dimension precoding matrix PMI are determined from the measurement results of the horizontal dimension CSI-RS of the 2N ports. 7. The apparatus of claim 6, wherein The sending unit is further configured to map each CSI-RS port in the vertical dimension to at least one RE of the time-frequency resource for transmission, and use a preset set of broadcast shaping weights in the horizontal dimension for each of the CSI-RS ports in the antenna array The row antenna is shaped. 8. The apparatus of claim 6, wherein The sending unit is specifically configured to respectively map the configured horizontal dimension CSI-RS of 2N ports to at least one RE for sending. 9. The apparatus of claim 8, wherein The sending unit is specifically configured to map the configured horizontal-dimension CSI-RS of 2N ports to at least one RE respectively before sending, and use a preset set of vertical broadcast shaping weights in the vertical dimension for each of the antenna arrays A column of antennas is shaped. 10. The apparatus of claim 6, further comprising: A determining unit, configured to determine a vertical dimension precoding matrix according to the port identifier of the vertical dimension CSI-RS; determine a horizontal dimension precoding matrix according to the RI and the horizontal dimension PMI; and determine the vertical dimension precoding matrix and the horizontal dimension The precoding matrix generates a precoding matrix for sending the physical downlink shared channel PDSCH. 11. A base station, comprising the apparatus according to any one of claims 6-10. 12. A CSI feedback method, characterized in that, comprising: Receive channel state information reference signal CSI-RS configuration information, the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port, where B is a preset value and N is a bipolar The number of columns of the antenna array is optimized, wherein the vertical dimension CSI-RS of the B port is sent according to the following method: in the vertical dimension, the vertical beamforming weights of the B group are used to form a one-to-one correspondence with the B vertical dimension CSI-RS ports B vertical beams; each vertical dimension CSI-RS port is mapped to at least one resource element RE of the time-frequency resource for transmission; Feedback the vertical dimension CSI-RS port identifier according to the measurement result of measuring the vertical dimension CSI-RS of the B port; The rank indicator RI and the horizontal dimension precoding matrix PMI are fed back according to the measurement result of the horizontal dimension CSI-RS of the 2N port. 13. The method according to claim 12, wherein, according to the following method, the vertical dimension CSI-RS port identifier is fed back according to the measurement result measured by the vertical dimension CSI-RS of the B port: The received signal strength of each vertical dimension CSI-RS port is measured, and the vertical dimension CSI-RS port identifier with the highest received signal strength is fed back. 14. A user equipment, characterized in that it comprises: The receiving unit is configured to receive channel state information reference signal CSI-RS configuration information, the CSI-RS configuration information includes the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port, wherein the vertical dimension of the B port The CSI-RS is sent according to the following method: use B groups of vertical beamforming weights in the vertical dimension to form B vertical beams corresponding to the B vertical dimension CSI-RS ports one-to-one; each vertical dimension CSI-RS The ports are respectively mapped to at least one resource element RE of the time-frequency resource and sent; a measuring unit, configured to respectively measure the vertical dimension CSI-RS of the B port and the horizontal dimension CSI-RS of the 2N port; The feedback unit is configured to feed back the identification of the vertical dimension CSI-RS port with the highest signal strength according to the measurement result of the vertical dimension CSI-RS of the B port; and measure the horizontal dimension CSI-RS of the 2N port The measurement result feedback rank indication RI and horizontal dimension precoding matrix PMI. 15. The user equipment of claim 14, wherein: The measuring unit is specifically used to measure the received signal strength of each vertical dimension CSI-RS port; The feedback unit is specifically configured to feed back the vertical dimension CSI-RS port identifier with the highest received signal strength.