CN110380767B

CN110380767B - Method and device for determining precoding matrix

Info

Publication number: CN110380767B
Application number: CN201810332271.5A
Authority: CN
Inventors: 祝慧颖; 黄逸; 任海豹; 李元杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2022-03-25
Anticipated expiration: 2038-04-13
Also published as: CN110380767A; WO2019196886A1

Abstract

The application provides a method and a device for determining a precoding matrix, which can reduce the occupation of uplink control channel or uplink data channel resources. The method for determining the precoding matrix comprises the following steps: the method comprises the steps that network equipment sends first configuration information to user equipment, wherein the first configuration information indicates an antenna panel interval or an antenna panel first phase difference; and the network equipment receives a Precoding Matrix Indicator (PMI) determined by the user equipment according to the antenna panel spacing or the first phase difference of the antenna panel. In the embodiment of the invention, the base station indicates the antenna panel phase difference to the user equipment, so that the occupation of uplink channel resources is reduced.

Description

Method and device for determining precoding matrix

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a precoding matrix.

Background

In a New Radio access technology (NR), a large-scale Multiple Input Multiple Output (Massive MIMO) technology is introduced to improve system capacity. In the Massive MIMO technology, data to be transmitted of a base station may be precoded in a codebook-based manner, so as to reduce interference between different data streams. The base station and the User Equipment (UE) obtain the same codebook through pre-storage or calculation, the base station sends a Reference Signal, such as a Channel State Information Reference Signal (CSI-RS), to the UE, and the UE performs Channel estimation by using the Reference Signal to further determine Channel State Information CSI, such as a Precoding Matrix Indicator (PMI). And the UE feeds the PMI back to the base station, and the base station determines a precoding matrix by using the PMI and precodes data to be sent. Under the NR system, the base station antenna may be composed of a plurality of antenna panels, for example, two antenna panels or four antenna panels.

Due to factors such as the distance between the antenna panels, phase differences exist between different antenna panels, namely, phase differences exist between signals of different antenna panels reaching the same UE, and the phase differences can be measured by the UE and then fed back to the base station, so that the base station can obtain an accurate precoding matrix. The pre-coding matrix determining mode occupies more uplink control channel resources.

Disclosure of Invention

The application provides a method and a device for determining a precoding matrix, which can reduce the occupation of uplink control channel or uplink data channel resources.

In a first aspect, a method for determining a precoding matrix is provided, including:

the method comprises the steps that network equipment sends first configuration information to user equipment, wherein the first configuration information indicates an antenna panel interval or an antenna panel first phase difference;

and the network equipment receives a Precoding Matrix Indicator (PMI) determined by the user equipment according to the antenna panel spacing or the first phase difference of the antenna panel.

In the embodiment of the invention, the base station indicates the antenna panel phase difference to the user equipment, so that the occupation of uplink channel resources is reduced.

With reference to the first aspect, in a first possible implementation manner, the first antenna panel phase difference is a function of the antenna panel pitch.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a third aspectIn a possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, and the Ng matrices satisfy

Wherein, c_x,yFor the front of the matrix corresponding to the first antenna panel in the precoding matrix

Element of the x-th row and y-th column of the submatrix of rows, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix,

is the first in the precoding matrix

Element of row y column, beta_pIndicating a third phase difference of the antenna panel as a function of the antenna panel spacing or the antenna panel first phase difference, a_p、b_p、a'_p、b'_pIs beta_pThe correction value of (1) is that P is the number of CSI-RS ports of one antenna panel, P is an integer and is not less than 1 and not more than Ng-1, and Ng is the number of the antenna panels.

With reference to the first aspect, in a fourth possible implementation manner, the first configuration information indicates a first phase difference of the antenna panel

Ng is the number of antenna panels.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

is a phase difference parameter between antenna panels, is alpha_kAs a function of (a) or (b),

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

N₁，N₂，O₁，O₂is a positive integer and is configured by the network side,

P_CSI-RS＝2NgN₁N₂。

with reference to the fourth possible implementation manner of the first aspect, in a sixth possible implementation manner, the method further includes:

the network equipment receives first indication information sent by the user equipment, wherein the first indication information indicates a first phase difference correction value delta of the antenna panel_pWherein

with reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the fourth possible implementation manner of the first aspect, in an eighth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the fifth or eighth possible implementation manner of the first aspect, in a ninth possible implementation manner,

wherein,

or,

wherein,

with reference to the sixth possible implementation manner of the first aspect, in a tenth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the seventh or tenth possible implementation manner of the first aspect, in an eleventh possible implementation manner:

wherein,

or,

wherein,

with reference to the fourth possible implementation manner of the first aspect, in a twelfth possible implementation manner,

when Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to the fourth possible implementation manner of the first aspect, in a thirteenth possible implementation manner,

when Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to the fourth possible implementation manner of the first aspect, in a fourteenth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to the fourth possible implementation manner of the first aspect, in a fifteenth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to the fourth possible implementation manner of the first aspect, in a sixteenth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to the fourth possible implementation manner of the first aspect, in a seventeenth possible implementation manner,

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

with reference to any one of the twelfth possible implementation manner to the seventeenth implementation manner of the first aspect, in an eighteenth possible implementation manner,

wherein,

or,

wherein,

in a second aspect, a method for determining a precoding matrix is provided, including:

the method comprises the steps that user equipment receives first configuration information sent by network equipment, wherein the first configuration information indicates an antenna panel interval or an antenna panel first phase difference;

and the user equipment sends a Precoding Matrix Indicator (PMI) determined according to the antenna panel spacing or the first phase difference of the antenna panels to the network equipment.

With reference to the second aspect, in a first possible implementation manner, the first antenna panel phase difference is a function of the antenna panel pitch.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝a_pb_pβ_p*c_x,y，

Wherein, c_x,yFor the first antenna panel in the precoding matrixFront of the corresponding matrix

is the first in the precoding matrix

With reference to the second aspect, in a fourth possible implementation manner, the first configuration information indicates a first phase difference of the antenna panel

Ng is the number of antenna panels.

With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the fourth possible implementation manner of the second aspect, in a sixth possible implementation manner, the method further includes:

the user equipment sends first indication information to the network equipment, wherein the first indication information indicates the first phase difference correction value delta of the antenna panel_pWherein

with reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

in a third aspect, a network device is provided, comprising a transmitter and a receiver:

the transmitter is configured to transmit first configuration information to user equipment, where the first configuration information indicates an antenna panel spacing or an antenna panel first phase difference;

the receiver is configured to receive a precoding matrix indicator PMI determined by the user equipment according to the antenna panel spacing or the first antenna panel phase difference.

With reference to the third aspect, in a first possible implementation manner, the first antenna panel phase difference is a function of the antenna panel pitch.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yFor precoding matrixElement of row (x + pP) and column y, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a third possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝a_pb_pβ_p*c_x,y，

is the first in the precoding matrix

With reference to the third aspect, in a fourth possible implementation manner, the first configuration information indicates a first phase difference of the antenna panel

Ng is dayNumber of line panels.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the fourth possible implementation manner of the third aspect, in a sixth possible implementation manner, the receiver is further configured to receive first indication information sent by the user equipment, where the first indication information indicates the antenna panel first phase difference correction value δ_pWherein

with reference to the sixth possible implementation manner of the third aspect, in a seventh possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

in a fourth aspect, a user equipment is provided, comprising a receiver and a transmitter:

the receiver is configured to receive first configuration information sent by a network device, where the first configuration information indicates an antenna panel interval or an antenna panel first phase difference;

the transmitter is configured to transmit, to the network device, a precoding matrix indicator PMI determined according to the antenna panel spacing or the antenna panel first phase difference.

With reference to the fourth aspect, in a first possible implementation manner, the first antenna panel phase difference is a function of the antenna panel pitch.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the user equipment according to claim 1 or 2, wherein the precoding matrix includes Ng matrices corresponding to the antenna panel, and the Ng matrices satisfy c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a third possible implementation manner, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝a_pb_pβ_p*c_x,y，

is the first in the precoding matrix

With reference to the fourth aspect, in a fourth possible implementation manner, the first configuration information indicates a first phase difference of the antenna panel

Ng is the number of antenna panels.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

is the phase between the antenna panelsA potential difference parameter of α_kAs a function of (a) or (b),

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

with reference to the fourth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the transmitter is further configured to transmit first indication information to the network device, where the first indication information indicates the antenna panel first phase difference correction value δ_pWherein

with reference to the sixth possible implementation manner of the fourth aspect, in a seventh possible implementation manner, when Ng is 2, a column vector of the precoding matrix is:

wherein,

is a phase difference parameter between the antenna panels,is alpha_kAs a function of (a) or (b),

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

in the second, third and fourth aspects, more precoding matrix forms may refer to the first aspect, and are not described herein again.

In one possible design, the scheme implemented by the user equipment may be implemented by a chip.

In a possible design, the scheme implemented by the network device may be implemented by a chip.

In one possible design, the network device provided by the present application may include a module for performing the behavior correspondence of the network device in the above method design. The modules may be software and/or hardware.

In one possible design, the terminal provided by the present application may include a module for performing the corresponding terminal behavior in the above method design. The modules may be software and/or hardware.

Yet another aspect of the present application provides a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform the method of the above-described aspects.

Yet another aspect of the present application provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of the above-described aspects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic diagram of a possible system architecture for implementing an embodiment of the present invention;

fig. 2 is a flowchart of a method for determining a precoding matrix according to an embodiment of the present invention;

fig. 3 is a flowchart of another method for determining a precoding matrix according to an embodiment of the present invention;

fig. 4 is a flowchart of another method for determining a precoding matrix according to an embodiment of the present invention;

fig. 5 is a flowchart of another method for determining a precoding matrix according to an embodiment of the present invention;

fig. 6 is a flowchart of another method for determining a precoding matrix according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The embodiments provided in the present application will be described in detail below with reference to the accompanying drawings. The network architecture and the service scenario described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

Fig. 1 shows a schematic diagram of a possible system network of the present application. As shown in fig. 1, at least one terminal 10 communicates with a Radio Access Network (RAN). The RAN comprises at least one network device 20, of which only one network device and one user equipment UE are shown for clarity. The RAN is connected to a Core Network (CN). Optionally, the CN may be coupled to one or more External networks (External networks), such as the internet, Public Switched Telephone Network (PSTN), and the like.

Some of the terms referred to in this application are described below for the sake of clarity.

In this application, the terms "network" and "system" are often used interchangeably, but those skilled in the art will understand the meaning. A User Equipment (UE) is a terminal device with communication function, which may also be referred to as a terminal, and may include a handheld device with wireless communication function, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, and the like. The user devices may be called different names in different networks, for example: a terminal, mobile station, subscriber unit, station, cellular telephone, personal digital assistant, wireless modem, wireless communication device, handheld device, laptop computer, cordless telephone, wireless local loop station, or the like. For convenience of description, the UE is simply referred to as user equipment UE in this application. The network device may be a Base Station (BS), a wireless access device in a cloud network, or a relay station, and the like having a wireless transceiving function. A base station, which may also be referred to as a base station device, is a device deployed in a radio access network to provide wireless communication functions. The names of base stations may be different in different radio access systems, for example, the base stations are called node B (NodeB) in a Universal Mobile Telecommunications System (UMTS) network, the base stations are called evolved node B (eNB or eNodeB) in the LTE network, and may be called Transmission Reception Point (TRP) in a future 5G System, network node or G-node B (G-NodeB, gNB), and so on. In the present application, "antenna panel" and "panel" are used interchangeably, and unless otherwise specified, the panels are referred to as antenna panels.

The embodiment of the invention provides a method for determining a precoding matrix. The method may be applied to the system shown in fig. 1. The following description takes the base station and the user equipment to implement the method as an example. As shown in fig. 2, the method includes:

step 201, a base station sends first configuration information to user equipment, where the first configuration information indicates an antenna panel spacing or an antenna panel first phase difference.

The first configuration information may carry an antenna panel spacing, or an antenna panel first phase difference. The first configuration information may also carry Ng-1 indexes, each index corresponds to a phase difference for indicating a phase difference between two antenna panels, and each index may occupy more than 2 bits.

Alternatively, the antenna panel first phase difference may be expressed as

Ng is the number of antenna panels.

The first phase difference of the antenna panel may be calculated by the base station according to the distance between the antenna panels, or may be calculated by the base station according to other parameters that may affect the phase difference of the antenna panels. The antenna panel first phase difference may be a function of the antenna panel spacing, or may be a function of other parameters that affect the antenna panel phase difference.

The first configuration information may be carried by Radio Resource Control (RRC) signaling; or carried by Media Access Control (MAC) layer signaling, for example, carried by a MAC control element (MAC CE); or may be carried through physical layer signaling, for example, through Downlink Control Information (DCI).

Step 202, the user equipment receives the configuration information.

Step 203, the user equipment obtains a precoding matrix column vector according to the first configuration information.

Optionally, the user equipment may determine a column vector of the precoding matrix according to a preset rule by using the configuration information. The base station may also determine the same precoding matrix according to the same rule.

Optionally, the method may further include:

step 204, the ue sends a Precoding Matrix Indicator (PMI) to the base station.

The base station determines one matrix or vector in the precoding matrix through the PMI.

In this application, there may be various implementation manners for determining the precoding matrix according to the first configuration information, and the following further describes through a plurality of embodiments.

The implementation mode is as follows:

the embodiment provides a method for determining a precoding matrix of a broadband mode multi-antenna panel, which comprises the following steps:

step 301, a base station sends first configuration information to user equipment, where the first configuration information indicates an antenna panel spacing or an antenna panel first phase difference.

The first configuration information may carry an antenna panel spacing, or an antenna panel phase difference.

The first configuration information may also carry Ng-1 indexes, each index corresponds to a phase difference for indicating a phase difference between two antenna panels, and each index may occupy more than 2 bits. The quantization accuracy can be improved by quantizing the antenna panel phase difference with more bits.

The antenna panel first phase difference may be expressed as

Ng is the number of antenna panels.

Step 302, the user equipment receives the configuration information.

Step 303, the user equipment obtains a precoding matrix column vector according to the first configuration information.

Optionally, the precoding matrix includes Ng matrices corresponding to the antenna panels, c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x row and y column of the matrix corresponding to the first antenna panel in the precoding matrix, the Ng matrices satisfy c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

Alternatively, a more specific example of a precoding matrix column vector is given below.

When Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

the values of (a) are merely examples and other values are possible.

Wherein,

is a Hadamard product, said Hadamard product being of length N₁N₂Vector of (2)

And a length of N₁N₂Vector v of_l,mThe elements at the corresponding positions are multiplied.

Alternatively, the amount referred to by the precoding matrix may have the following physical meaning. N is a radical of₁Representing the number of CSI-RS ports in the horizontal direction of each antenna panel, N₂Representing the number of CSI-RS ports in the vertical direction of each antenna panel. Considering two polarization directions of the antenna array, the number of CSI-RS ports corresponding to each antenna panel is 2N₁N₂。

The precoding matrix representing one polarization direction of each antenna panel is formed by the length N₁N₂Of (2), wherein

Indicating a length of N in the vertical direction₂DFT beam vector of (1), wherein O₁、O₂Oversampling factors respectively representing a horizontal dimension and a vertical dimension, l and m being beam indexes of the horizontal dimension and the vertical dimension in the precoding matrix;

representing the phase difference between the two polarization directions,

may be {1, j, -1, -j }, n being the index of the polarization phase factor in the precoding matrix;

an antenna panel phase difference parameter related to the antenna panel spacing is indicated.

Optionally, when the number of layers (layers) of data to be transmitted is 1, the wideband mode multi-panel precoding matrix is

When the layer is 2, the wideband mode multi-panel precoding matrix is

When the layer is 3, the wideband mode multi-panel precoding matrix is

When the layer is 4, the wideband mode multi-panel precoding matrix is

Optionally, the method may further include:

step 304, the user equipment feeds back the PMI to the base station.

And after the user equipment determines the precoding matrix according to the channel state information, the user equipment indicates the selected precoding matrix by feeding back the PMI to the base station. The PMI includes a plurality of indexes and can uniquely identify a precoding matrix.

The PMI comprises a first PMI value and a second PMI value, wherein the first PMI value corresponds to broadband channel state information, and the second PMI value corresponds to subband channel state information. The first PMI value corresponds to CSI of a wideband, and the second PMI value corresponds to CSI of a subband. When the number of layers of the system is 1, the first PMI value corresponds to two first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1And a first vertical precoding matrix index i_1,2When the number of layers is greater than 1, the first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the index l of the precoding matrix is set byFirst horizontal precoding matrix index i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; the value of index n is indexed by the second precoding matrix i₂And (4) determining. According to the number of layers of the system and the corresponding broadband mode multi-panel pre-coding matrix structure

(or

) And the value of the subscript (l, m, n) or (l, l ', m, m', n) determines the precoding matrix.

In the embodiment of the invention, the phase difference of the antenna panel is sent to the user equipment by the base station, so that the occupation of uplink channel resources is reduced.

The implementation mode two is as follows:

step 401, a base station sends first configuration information to user equipment, where the first configuration information indicates an antenna panel spacing or an antenna panel first phase difference.

The antenna panel first phase difference may be expressed as

Ng is the number of antenna panels.

Step 402, the user equipment receives the configuration information.

Step 403, the ue feeds back first indication information to the base station, where the first indication information indicates the first phase difference correction value δ of the antenna panel_pWherein

step 404, the user equipment according to alpha_kAnd delta_pA column vector of a precoding matrix is determined.

Optionally, the method may further include:

step 405, the base station according to alpha_kAnd delta_pA column vector of a precoding matrix is determined.

Optionally, the precoding matrix includes Ng matrices corresponding to the antenna panel, where the Ng matrices satisfy c_x+pP,y＝θ_pβ_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pIndicating an antenna panel third phase difference as a function of the antenna panel spacing or the antenna panel first phase difference, θ_pIndicating phase difference beta between antenna panels_pThe correction value can be determined by the UE and fed back to the base station, P is the number of CSI-RS ports of one antenna panel, P is an integer and is not less than 1 and not more than Ng-1, and Ng is the number of the antenna panels.

When Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

when Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

the values of (a) are merely examples and other values are possible.

Wherein,

is a Hadamard product, saidHadamard product is of length N₁N₂Vector of (2)

representing the phase difference between the two polarization directions,

δ_pIndicating a UE determined antenna panel phase difference correction value, wherein

Is the index of the correction value, δ_pCan be indicated by 1 bit, taking values such as

Or indicated by 2 bits, taking values such as

When the layer is 2, the wideband mode multi-panel precoding matrix is

When the layer is 3, the wideband mode multi-panel precoding matrix is

When the layer is 4, the wideband mode multi-panel precoding matrix is

Optionally, the method may further include:

step 406, the ue feeds back the PMI to the base station.

Optionally, the PMI feedback manner may be multiple, for example:

PMI feedback method 1: the PMI comprises a first PMI value and a second PMI value, wherein the first PMI value corresponds to CSI of the wideband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to four first pre-catalogsCode matrix index, respectively first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2First precoding matrix index difference value index i_1,3And a first phase factor precoding matrix index i_1,4(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the index l of the wideband mode multi-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript

Is indexed by a first phase factor precoding matrix

Determining; the value of index n is indexed by the second precoding matrix i₂And (4) determining. According to the number of layers of the system and the structure of the broadband mode multi-panel pre-coding matrix

(or

) And the value of the subscript (l, m, n, p) or (l, l ', m, m', n, p) determines the precoding matrix.

PMI feedback method 2: the PMI comprises a first PMIThe apparatus includes a PMI value, a second PMI value and a third PMI value, wherein the first PMI value and the third PMI value correspond to CSI of a wideband, and the second PMI value corresponds to CSI of a subband. The first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂(ii) a The third PMI value corresponds to a third precoding matrix index i₃. The value of the index l of the wideband mode multi-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; the value of index n is indexed by the second precoding matrix i₂Determining; subscript

Is indexed by the third precoding matrix

And (4) determining. According to the number of layers of the system and the corresponding broadband mode multi-panel pre-coding matrix structure

(or

In this embodiment, the base station indicates the phase difference of the antenna panel to the terminal, and the terminal further corrects the phase difference of the antenna panel, thereby improving the accuracy of the precoding matrix. When the correction value is indicated by fewer bits, the occupation of the uplink channel resource is not increased.

The implementation mode is three:

the embodiment provides a method for determining a precoding matrix of a two-antenna panel in a subband mode, which comprises the following steps:

step 501, a base station sends first configuration information to user equipment, wherein the first configuration information indicates an antenna panel spacing or an antenna panel first phase difference.

The first configuration information may also carry 1 index, where one index corresponds to one phase difference for indicating the phase difference between two antenna panels, and one index may occupy more than 2 bits. The quantization accuracy can be improved by quantizing the antenna panel phase difference with more bits.

The antenna panel first phase difference may be denoted as α_k＝α₁,Ng＝1。

Step 502, the user equipment receives the configuration information.

Step 503, the user equipment obtains a precoding matrix column vector according to the first configuration information.

Optionally, the method may further include:

step 504, the ue feeds back the PMI to the base station.

In this embodiment, the specific form of the precoding matrix may be various, and only two examples are given below:

precoding matrix example 1:

optionally, the precoding matrix in the codebook includes a plurality of matrices corresponding to the antenna panels one to one, and there is an association relationship between the matrices corresponding to the plurality of panels, where the association relationship specifically includes that Ng matrices satisfyc_x+pP,y＝a_pb_pβ_p*c_x,yAnd

wherein, c_x,yIs the front of the matrix corresponding to the first panel in the pre-coding matrix

is the first in the precoding matrix

Element of row y column, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, a_p、b_p、a'_p、b'_pFor indicating phase difference beta between antenna panels_pThe correction value can be determined by the UE and fed back to the base station, P is the number of CSI-RS ports corresponding to each panel, and P is [1, N ]_g-1]Is a positive integer of (1).

When Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

a_p2，

the values of (a) are merely examples and other values are possible.

Wherein,

representing two directions of polarizationThe phase difference between the two phases is small,

may be {1, j, -1, -j }, n₀Is the index of the polarization phase factor in the precoding matrix;

a phase factor representing the bandwidth of the signal,

may be of a value of

p₁、 p₂Is the phase factor index of the wideband;

which represents the phase factor of the sub-band,

may be of a value of

n₁、n₂Is the phase factor index of the subband;

Optionally, when the number of layers (layers) of data to be transmitted is 1, the subband mode two-antenna panel precoding matrix is

When the layer is 2, the subband mode two-antenna panel precoding matrix is

When the layer is 3, the subband mode two-antenna panel precoding matrix is

When the layer is 4, the subband mode two-antenna panel precoding matrix is

The PMI fed back by the UE may be implemented in various ways, for example:

PMI feedback method 1: the PMI comprises a first PMI value and a second PMI value, wherein the first PMI value corresponds to CSI of the wideband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to four first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2First precoding matrix index difference value index i_1,3And a first phase factor precoding matrix index i_1,4(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the subband mode two-panel precoding matrix subscript l is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript p ═ p₁ p₂]Is indexed by a first phase factor precoding matrix i_1,4＝[i_1,4,1 i_1,4,2](ii) a Subscript n ═ n₀ n₁ n₂]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2]And (4) determining. According to the number of layers of the system and the pre-coding matrix structure of the two panels corresponding to the sub-band mode

(or

PMI feedback method 2: the PMI comprises a first PMI value, a second PMI value and a third PMI value, wherein the first PMI value and the third PMI value correspond to CSI of the broadband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂(ii) a The third PMI value corresponds to a third precoding matrix index i₃. The value of the subband mode two-panel precoding matrix subscript l is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀n₁n₂]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2]Determining; subscript p ═ p₁p₂]Is indexed by the third precoding matrix i₃＝[i_3,1 i_3,2]And (4) determining. According to the number of layers of the system and the pre-coding matrix structure of the two panels corresponding to the sub-band mode

(or

Precoding matrix example 2:

optionally, the precoding matrix in the codebook includes a plurality of matrices corresponding to the antenna panels one to one, and there is an association relationship between the matrices corresponding to the plurality of panels, where the association relationship specifically includes that Ng matrices satisfy c_x+pP,y＝b_pβ_p*c_x,yAnd

is the first in the precoding matrix

Element of row y column, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, b_p、b'_pFor indicating phase difference beta between antenna panels_pCan be determined by the UE and fed back to the base stationThe P is the number of CSI-RS ports corresponding to each panel, and is [1, N ]_g-1]Is a positive integer of (1).

When Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

the values of (a) are merely examples and other values are possible.

Wherein,

representing the phase difference between the two polarization directions,

which represents the phase factor of the sub-band,

may be of a value of

n₁、n₂Is the phase factor index of the subband;

When the layer is 2, the subband mode two-antenna panel precoding matrix is

When the layer is 3, the subband mode two-antenna panel precoding matrix is

When the layer is 4, the subband mode two-antenna panel precoding matrix is

In this embodiment, the PMI includes a first PMI value corresponding to CSI of the wideband and a second PMI value corresponding to CSI of the subband. The first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the subband mode two-panel precoding matrix subscript l is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀n₁n₂]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1i_2,2]And (4) determining. According to the number of layers of the system and the pre-coding matrix structure of the two panels corresponding to the sub-band mode

(or

In the embodiment, the base station indicates the phase difference of the antenna panel to the terminal, and the terminal further corrects the phase difference of the antenna panel on the sub-band granularity, so that the accuracy of the precoding matrix is improved. When the correction value is indicated by fewer bits, the occupation of the uplink channel resource in the sub-band mode is not increased

The implementation mode is four:

the embodiment provides a method for determining a pre-coding matrix of a four-antenna panel in a subband mode, which comprises the following steps:

step 601, the base station sends first configuration information to the user equipment, wherein the first configuration information indicates an antenna panel distance or an antenna panel first phase difference.

The first configuration information may carry an antenna panel spacing, or an antenna panel first phase difference. The first configuration information may also carry 3 indexes, each index corresponds to a phase difference for indicating a phase difference between two antenna panels, and each index may occupy more than 2 bits. The quantization accuracy can be improved by quantizing the antenna panel phase difference with more bits.

The antenna panel first phase difference may be denoted as α_k＝[α₁ α₂ α₃]。

Step 602, the user equipment receives the configuration information.

Step 603, the user equipment obtains a precoding matrix column vector according to the first configuration information.

Optionally, the method may further include:

step 604, the ue feeds back the PMI to the base station.

precoding matrix example 1:

optionally, the precoding matrix in the codebook includesA plurality of matrixes corresponding to the antenna panels one to one, wherein the matrixes corresponding to the panels have incidence relations, and the incidence relations specifically include that Ng matrixes meet c_x+pP,y＝b_pβ_p*c_x,yWherein c is_x,yIs the element of the x-th row and y-th column of the matrix corresponding to the first panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, b_pFor indicating phase difference beta between antenna panels_pThe correction value can be determined by the UE and fed back to the base station, P is the number of CSI-RS ports corresponding to each panel, and P is [1, N ]_g-1]Is a positive integer of (1).

When Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

the values of (a) are merely examples and other values are possible.

Wherein,

Optionally, the amount referred to by the precoding matrix may have the following physical meaning。N₁Representing the number of CSI-RS ports in the horizontal direction of each antenna panel, N₂Representing the number of CSI-RS ports in the vertical direction of each antenna panel. Considering two polarization directions of the antenna array, the number of CSI-RS ports corresponding to each antenna panel is 2N₁N₂。

representing the phase difference between the two polarization directions,

the inter-panel phase factor of a sub-band is represented,

there is a functional relationship, such as a linear relationship;

Optionally, inter-panel phase factor of sub-band

At least one phase factor is a fixed value, or has a predefined value rule, or is indicated to the UE by the TRP through a high-level signaling, the remaining phase factors need to be fed back by the UE, and the value of the phase factor can be

Corresponding to n₁And/or n₂And/or n₃Is the phase factor index fed back by the UE.

Optionally, when the layer of data to be transmitted is 1, the subband mode four-panel precoding matrix is

When the layer is 2, the subband mode four-panel precoding matrix is

When the layer is 3, the subband mode four-panel precoding matrix is

When the layer is 4, the subband mode four-panel precoding matrix is

Optionally in this embodiment, the PMI includes a first PMI value and a second PMI value, where the first PMI value corresponds to CSI of the wideband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the sub-band mode four panel precoding matrix index l is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀ n₁ n₂ n₃]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2 i_2,3]And the signal is determined together with high-layer signaling or a predefined value rule or a predefined fixed value. According to the number of layers of the system and the four-panel pre-coding matrix structure corresponding to the sub-band mode

(or

) And the value of the subscript (l, m, n) or (l, l ', m, m', n) determines the subband-mode four-panel precoding matrix.

Precoding matrix example 2:

optionally, the precoding matrix in the codebook includes a plurality of matrices corresponding to the antenna panels one to one, and there is an association relationship between the matrices corresponding to the plurality of panels, where the association relationship specifically includes that Ng matrices satisfy c_x+pP,y＝a_pb_pβ_p*c_x,yWherein c is_x,yIs the element of the x-th row and y-th column of the matrix corresponding to the first panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, a_p、b_pFor indicating phase difference beta between antenna panels_pCorrection value of (2), the correction valueThe number of CSI-RS ports corresponding to each panel can be determined by the UE and fed back to the base station, wherein P is the number of [1, N ]_g-1]Is a positive integer of (1).

When Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

the values of (a) are merely examples and other values are possible.

Wherein,

representing the phase difference between the two polarization directions,

inter-panel phase factor, n, representing a subband₁、n₂、n₃Is the phase factor index of the sub-band,

there is a functional relationship, such as a linear relationship;

representing an antenna panel phase difference parameter related to an antenna panel spacing;

an inter-panel phase factor representing the UE-specific wideband, which can be determined by the UE and fed back to the base station, a_p1、a_p2、 a_p3May be of a value of

p₁、p₂Is a UE-specific broadband planeInter-plate phase factor index.

Optionally, inter-panel phase factor of sub-band

When the number of layers of data to be transmitted is 1, the subband mode four-panel precoding matrix is

When the number of layers is 2, the subband mode four-panel precoding matrix is

When the number of layers is 3, the subband mode four-panel precoding matrix is

When the number of layers is 4, the subband mode four-panel precoding matrix is

The PMI fed back by the UE may be implemented in various ways, for example:

PMI feedback method 1: the PMI comprises a first PMI value and a second PMI value, wherein the first PMI value corresponds to CSI of the wideband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to four first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2First precoding matrix index difference value index i_1,3And a first phase factor precoding momentArray index i_1,4(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the index l of the subband-mode four-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript p ═ p₁ p₂p₃]Is indexed by a first phase factor precoding matrix i_1,3＝[i_1,3,1 i_1,3,2 i_1,3,3]Determining; subscript n ═ n₀ n₁n₂ n₃]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2 i_2,3]And the signal is determined together with high-layer signaling or a predefined value rule or a predefined fixed value. According to the number of layers of the system and the structure of the broadband mode multi-panel pre-coding matrix

(or

And the value of the subscript (l, m, n, p) or (l, l ', m, m', n, p) determines the subband-mode four-panel precoding matrix.

PMI feedback method 2: the PMI comprises a first PMI value, a second PMI value and a third PMI value, wherein the first PMI value and the third PMI value correspond to CSI of the broadband, and the second PMI value corresponds to CSI of the subband. What is needed isThe first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂(ii) a The third PMI value corresponds to a third precoding matrix index i₃. The value of the index l of the subband-mode four-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀ n₁ n₂ n₃]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2i_2,3]The method is determined together with high-level signaling or a predefined value rule or a predefined fixed value; subscript p ═ p₁ p₂ p₃]Is indexed by the third precoding matrix i₃＝[i_3,1i_3,2i_3,3]And (4) determining. According to the number of layers of the system and the multi-panel pre-coding matrix structure corresponding to the sub-band mode

(or

) And the value of the subscript (l, m, n, p) or (l, l ', m, m', n, p) determines the subband modulusA formula four panel precoding matrix.

Precoding matrix example 3:

is the first in the precoding matrix

Element of row y column, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, b_p、b'_pFor indicating phase difference beta between antenna panels_pThe correction value can be determined by the UE and fed back to the base station, P is the number of CSI-RS ports corresponding to each panel, and P is [1, N ]_g-1]Is a positive integer of (1).

When Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

b_n2,b_n3,b_n4,b_n5,b_n6the values of (a) are merely examples and other values are possible.

Wherein

representing the phase difference between the two polarization directions,

inter-panel phase factor, n, representing a subband₁、n₂、n₃、n₄、 n₅、n₆Is the phase factor index of the sub-band,

there is a functional relationship, such as a linear relationship;

Optionally, inter-panel phase factor of sub-band

Corresponding to n₁And/or n₂And/or n₃And/or n₄And/or n₅And/or n₆Is the phase factor index fed back by the UE.

Optionally, when the number of layers of data to be transmitted is 1, the subband mode four-panel precoding matrix is

When the number of layers is 2, the subband mode four-panel precoding matrix is

When the number of layers is 3, the subband mode four-panel precoding matrix is

When the number of layers is 4, the subband mode four-panel precoding matrix is

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀n₁n₂n₃n₄n₅n₆]Is indexed by the second precoding matrix i₂＝[i_2,0i_2,1i_2,2i_2,3i_2,4i_2,5i_2,6]And the signal is determined together with high-layer signaling or a predefined value rule or a predefined fixed value. According to the number of layers of the system and the four-panel pre-coding matrix structure corresponding to the sub-band mode

(or

Precoding matrix example 4:

the precoding matrix in the codebook comprises a plurality of matrixes which are in one-to-one correspondence with the antenna panels, and correlation relations exist among the matrixes corresponding to the panels, wherein the correlation relations specifically comprise that the Ng matrixes meet c_x+pP,y＝a_pb_pβ_p*c_x,yAnd

Element of the x-th row and y-th column of the submatrix of rows, c_x+P,yIs the element of the y column of the (x + P) th row in the precoding matrix,

is the first in the precoding matrix

Element of row y column, beta_pIs a function of said configurable parameter for indicating a phase difference between the antenna panels, a_p、b_p、a'_p、b'_pFor indicating phase difference beta between antenna panels_pCorrection value of (2), the correctionThe value can be determined by the UE and fed back to the base station, wherein P is the number of CSI-RS ports corresponding to each panel, and P is [1, N ]_g-1]Is a positive integer of (1).

When Ng is 4, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

alternatively to this, the first and second parts may,

wherein,

or,

wherein,

in this embodiment of the present invention,

a_p2,a_p3,a_p4,a_p5,a_p6，

Wherein,

representing the phase difference between the two polarization directions,

an inter-panel phase factor representing a UE-specific wideband, which value may be determined by the UE and fed back to the base station,

may be of a value of

p₁、p₂、 p₃、p₄、p₅、p₆Inter-panel phase factor indices, which are UE-specific wideband, can be determined by the UE and fed back to the base station;

inter-panel phase factor, n, representing a subband₁、n₂、n₃、n₄、n₅、n₆Is the phase factor index of the sub-band,

there is a functional relationship, such as a linear relationship;

Optionally, inter-panel phase factor b of sub-band_n1、b_n2、b_n3、b_n4、b_n5、b_n6At least one phase factor is a fixed value, or has a predefined value rule, or is indicated to the UE by the TRP through a high-level signaling, the remaining phase factors need to be fed back by the UE, and the value of the phase factor can be

When the number of layers is 2, the subband mode four-panel precoding matrix is

When the number of layers is 3, the subband mode four-panel precoding matrix is

When the number of layers is 4, the subband mode four-panel precoding matrix is

The PMI fed back by the UE may be implemented in various ways, for example:

PMI feedback method 1:

the PMI comprises a first PMI value and a second PMI value, wherein the first PMI value corresponds to CSI of the wideband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to four first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2First precoding matrix index difference value index i_1,3And a first phase factor precoding matrix index i_1,4(ii) a The second PMI value corresponds to a second precoding matrix index i₂. The value of the index l of the subband-mode four-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript p ═ p₁ p₂ p₃ p₄ p₅p₆]Is indexed by a first phase factor precoding matrix i_1,3＝[i_1,3,1 i_1,3,2 i_1,3,3 i_1,3,4 i_1,3,5 i_1,3,6]Determining; lower partThe symbol n ═ n₀ n₁ n₂ n₃ n₄ n₅ n₆]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2 i_2,3 i_2,4i_2,5 i_2,6]And the signal is determined together with high-layer signaling or a predefined value rule or a predefined fixed value. According to the number of layers of the system and the multi-panel pre-coding matrix structure corresponding to the sub-band mode

(or

) And the value of the subscript (l, m, n, p) or (l, l ', m, m', n, p) determines the subband-mode four-panel precoding matrix.

PMI feedback method 2:

the PMI comprises a first PMI value, a second PMI value and a third PMI value, wherein the first PMI value and the third PMI value correspond to CSI of the broadband, and the second PMI value corresponds to CSI of the subband. The first PMI value corresponds to three first precoding matrix indexes, namely a first horizontal precoding matrix index i_1,1First vertical precoding matrix index i_1,2And a first precoding matrix index difference value index i_1,3(ii) a The second PMI value corresponds to a second precoding matrix index i₂(ii) a The third PMI value corresponds to a third precoding matrix index i₃. The value of the index l of the subband-mode four-panel precoding matrix is indexed by a first horizontal precoding matrix i_1,1Determining; the value of index m is indexed by the first vertical precoding matrix i_1,2Determining; when the number of layers is greater than 1,

or

And

or

The difference value of the middle subscripts (l ', m') and (l, m) is indexed by the first precoding matrix index difference value index i_1,3Determining; subscript n ═ n₀ n₁ n₂ n₃ n₄ n₅ n₆]Is indexed by the second precoding matrix i₂＝[i_2,0 i_2,1 i_2,2 i_2,3 i_2,4i_2,5 i_2,6]The method is determined together with high-level signaling or a predefined value rule or a predefined fixed value; subscript p ═ p₁ p₂ p₃p₄ p₅ p₆]Is indexed by the third precoding matrix i₃＝[i_3,1 i_3,2 i_3,3 i_3,4 i_3,5 i_3,6]And (4) determining. According to the number of layers of the system and the structure of the broadband mode multi-panel pre-coding matrix

(or

The embodiment of the invention further provides an embodiment of a device for realizing the steps and the method in the embodiment of the method. The methods, steps, technical details, technical effects and the like of the foregoing method embodiments are also applicable to the apparatus embodiments, and will not be described in detail later.

Fig. 7 shows a schematic diagram of a network device, which can be applied to the system shown in fig. 1. The network device 20 includes one or more Remote Radio Units (RRUs) 701 and one or more baseband units (BBUs) 702. RRU701 may be referred to as a transceiver unit, transceiver circuitry, or transceiver, etc., which may include at least one antenna 7011 and a radio frequency unit 7012. The RRU701 is mainly used for transceiving radio frequency signals and converting the radio frequency signals and baseband signals, for example, for sending signaling indication or reference signals in the above embodiments to a terminal. The BBU702 is mainly used for performing baseband processing, controlling network devices, and the like. RRU701 and BBU702 may be physically located together or physically separated, i.e., distributed base stations.

The BBU702 is a control center of the network device, and may also be referred to as a processing unit, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. In an example, the BBU702 may be formed by one or more boards, and the boards may support a radio access network of a single access system (e.g., a 5G network) together, or may support radio access networks of different access systems respectively. BBU702 also includes a memory 7021 and a processor 7022. The memory 7021 is used to store the necessary instructions and data. The processor 7022 is used to control the network devices to perform the necessary actions. Memory 7021 and processor 7022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Or multiple boards may share the same memory and processor. In addition, each single board is provided with necessary circuits.

The network device may be configured to implement the method in the foregoing method embodiment, specifically:

a transmitter for transmitting first configuration information to a user equipment, the first configuration information indicating an antenna panel spacing or an antenna panel first phase difference.

A receiver, configured to receive a precoding matrix indicator PMI determined by the user equipment according to the antenna panel spacing or the first antenna panel phase difference.

Optionally, the receiver is further configured to receive first indication information fed back by the user equipment, where the first indication information indicates the first phase difference correction value of the antenna panel.

Optionally, the processor is configured to determine a precoding matrix according to the first configuration information.

Optionally, the processor is further configured to determine one matrix or vector in the precoding matrix according to the PMI.

The specific form of the precoding matrix, the PMI feedback mode, and the like may refer to the foregoing method embodiments, and are not described herein again.

Fig. 8 provides a schematic structural diagram of a terminal. The terminal may be adapted for use in the system shown in fig. 1. For convenience of explanation, fig. 8 shows only main components of the terminal. As shown in fig. 8, the terminal 10 includes a processor, a memory, a control circuit or antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the whole terminal, executing software programs and processing data of the software programs. The memory is mainly used for storing software programs and data, for example, the codebook described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. The input and output device, such as a touch screen, a display screen or a keyboard, is mainly used for receiving data input by a user and outputting data to the user.

When the terminal is started, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 8 shows only one memory and processor for ease of illustration. In an actual terminal, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this respect in the embodiment of the present invention.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal, execute a software program, and process data of the software program. The processor in fig. 8 integrates the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal may include a plurality of baseband processors to accommodate different network formats, a plurality of central processors to enhance its processing capability, and various components of the terminal may be connected by various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

For example, in the embodiment of the present invention, the antenna and the control circuit having the transceiving function may be regarded as the transceiving unit 801 of the terminal 10, and the processor having the processing function may be regarded as the processing unit 802 of the terminal 10. As shown in fig. 8, the terminal 10 includes a transceiving unit 801 and a processing unit 802. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Alternatively, a device for implementing a receiving function in the transceiver unit 801 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit 801 may be regarded as a sending unit, that is, the transceiver unit 801 includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, a receiving circuit, or the like, and the sending unit may be referred to as a transmitter, a sending circuit, or the like.

The terminal may be configured to implement the method in the foregoing method embodiment, specifically:

the antenna panel space adjusting device comprises a receiver and a control unit, wherein the receiver is used for receiving first configuration information sent by network equipment, and the first configuration information indicates an antenna panel space or an antenna panel first phase difference;

a transmitter, configured to transmit, to the network device, a precoding matrix indicator PMI determined by the user equipment according to the antenna panel interval or the antenna panel first phase difference.

Optionally, the transmitter is further configured to transmit first indication information to the network device, where the first indication information indicates the antenna panel first phase difference correction value.

In this embodiment, the ue determines the precoding matrix according to the first configuration information, and determines the PMI to indicate one matrix or vector in the precoding matrix.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Claims

1. A method of determining a precoding matrix, comprising:

the network equipment receives a Precoding Matrix Indicator (PMI) determined by the user equipment according to the antenna panel spacing or the first phase difference of the antenna panel;

wherein the precoding matrix includes Ng matrices corresponding to the antenna panel, the Ng matrices satisfying c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pAnd indicating a second phase difference of the antenna panels, wherein the second phase difference of the antenna panels is a function of the distance between the antenna panels or the first phase difference of the antenna panels, P is the number of CSI-RS ports of one antenna panel, P is an integer, and is more than or equal to 1 and less than or equal to Ng-1, and Ng is the number of the antenna panels.

2. The method of claim 1, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

3. The method of claim 1, wherein the first configuration information indicates the antenna panel first phase difference

Ng is the number of antenna panels.

4. The method of claim 3, wherein when Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

5. The method of claim 3, further comprising:

6. the method of claim 5, wherein when Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

7. a method of determining a precoding matrix, comprising:

wherein the precoding matrix includes Ng matrices corresponding to the antenna panel, the Ng matrices satisfying c_x+pP,y＝a_pb_pβ_p*c_x,y，

is the first in the precoding matrix

8. The method of claim 7, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

9. The method of claim 7, wherein the first configuration information indicates the antenna panel first phase difference

Ng is the number of antenna panels.

10. The method of claim 9, wherein when Ng is 2, the column vector of the precoding matrix is:

wherein,

is a phase difference parameter between antenna panelsNumber of α_kAs a function of (a) or (b),

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

11. The method of claim 9, further comprising:

12. the method of claim 11, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

13. a method of determining a precoding matrix, comprising:

the user equipment sends a Precoding Matrix Indicator (PMI) determined according to the antenna panel spacing or the first phase difference of the antenna panels to the network equipment;

wherein the precoding matrix includes Ng matrices corresponding to the antenna panel, the Ng matrices satisfying c_x+pP,y＝β_p*c_x,yWherein c is_x,yFor the elements of the x-th row and y-th column of the matrix corresponding to the first antenna panel in the precoding matrix, c_x+pP,yIs the element of the y column of the (x + pP) th row in the precoding matrix, beta_pIndicating a second phase difference of an antenna panel, the antenna panel second phaseThe phase difference is a function of the antenna panel spacing or the antenna panel first phase difference, P is the number of CSI-RS ports of one antenna panel, P is an integer and is greater than or equal to 1 and less than or equal to Ng-1, and Ng is the number of antenna panels.

14. The method of claim 13, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

15. The method of claim 13, wherein the first configuration information indicates a first phase difference for the antenna panel

Ng is the number of antenna panels.

16. The method of claim 15, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

is a dayThe phase difference parameter between the line panels is alpha_kAs a function of (a) or (b),

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

17. The method of claim 15, further comprising:

18. the method of claim 17, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

19. a method of determining a precoding matrix, comprising:

is the first in the precoding matrix

20. The method of claim 19, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

21. The method of claim 19, wherein the first configuration information indicates the antenna panel first phase difference

22. The method of claim 21, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

23. The method of claim 21, further comprising:

24. the method of claim 23, wherein when Ng is 2, the column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

25. a network device, comprising a transmitter and a receiver:

the receiver is configured to receive a precoding matrix indicator PMI determined by the user equipment according to the antenna panel spacing or the first antenna panel phase difference;

26. The network device of claim 25, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

27. The network device of claim 25, wherein the first configuration information indicates a first phase difference for the antenna panel

Ng is the number of antenna panels.

28. The network device of claim 27, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

29. The network device of claim 27, wherein:

the receiver is further configured to receive first indication information sent by the ue, where the first indication information refers toA first phase difference correction value delta for the antenna panel_pWherein

30. the network device of claim 29, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

31. a network device, comprising a transmitter and a receiver:

is the first in the precoding matrix

32. The network device of claim 31, wherein the antenna panel first phase difference is a function of the antenna panel spacing.

33. The network device of claim 31, wherein the first configuration information indicates the antenna panel first phase difference

34. The network device of claim 33, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

35. The network device of claim 33, wherein:

the receiver is further configured to receive first indication information sent by the user equipment, where the first indication information indicates the antenna panel first phase difference correction value δ_pWherein

36. the network device of claim 35, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂。

37. a user equipment, comprising a receiver and a transmitter:

the transmitter is configured to transmit a precoding matrix indicator PMI determined according to the antenna panel spacing or the first antenna panel phase difference to the network device;

38. The user equipment of claim 37 wherein the antenna panel first phase difference is a function of the antenna panel spacing.

39. The UE of claim 37, wherein the first configuration information indicates a first phase difference of the antenna panels

Ng is the number of antenna panels.

40. The UE of claim 39, wherein when Ng is 2, a column vector of the precoding matrix is:

wherein,

l＝0,...,N₁O₁-1，

m＝0,...,N₂O₂-1，

P_CSI-RS＝2NgN₁N₂，

41. The user equipment of claim 39, wherein:

the transmitter is further configured to transmit first indication information to the network device, where the first indication information indicates the antenna panel first phase difference correction value δ_pWherein