WO2019023828A1

WO2019023828A1 - Jt precoding weight matrix generation method, device, and system

Info

Publication number: WO2019023828A1
Application number: PCT/CN2017/095102
Authority: WO
Inventors: 吴宪; 钱锋; 楼群芳
Original assignee: 华为技术有限公司
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2019-02-07

Abstract

The present application discloses a JT precoding weight matrix generation method, device, and system, relating to the field of communication technologies, capable of reducing transmission delays and avoiding expiration of channel information. The method comprises: a network side device acquiring r 1 , r 2 , w 1 , w 2 , and w 3 , wherein r 1 indicates the number of transmission layers of a serving cell, r 2 indicates the number of transmission layers of a coordinated neighboring cell, and w 1 indicates a complex matrix obtained through calculation according to channel information h 1 of the serving cell, w 2 indicates a complex matrix orthogonal to h 1 w 1 or h 2 w 3 , and w 3 satisfies h 2 w 3 = h 1 w 1 diag(α i ); the network side device generating a JT precoding weight matrix, comprising an all-zero submatrix with TxNum rows and r 2 columns, a first precoding weight submatrix, a second precoding weight submatrix, and a third precoding weight submatrix, wherein the first precoding weight submatrix is generated according to w 1 , the first precoding weight submatrix and the serving cell in single cell mode uses a same precoding weight matrix, the first precoding weight submatrix and the all-zero submatrix are used for the serving cell to perform a precoding operation, and the second precoding weight submatrix and the third precoding weight submatrix are used for the coordinated neighboring cell to perform a precoding operation.

Description

Method, device and system for generating JT precoding weight matrix

Technical field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for generating a Joint Transmission (JT) precoding weight matrix.

Background technique

In a traditional cellular system, each user equipment (User Equipment, UE) receives interference from the cell and is also interfered by the neighboring area. In particular, the UE located at the edge of the cell may suffer from interference from the neighboring area, resulting in a decrease in the signal to interference and noise ratio and a decrease in performance. In order to improve the user experience of the UE located at the edge of the cell and solve the interference problem, a Coordinated Multipoint (CoMP) technology based on inter-cell cooperation is proposed. The CoMP technology can improve the location by suppressing or utilizing inter-cell interference. The received signal to noise ratio of the UE at the cell edge. The downlink JT technology in the CoMP technology enables the serving cell of the UE and the coordinated neighboring cell (ie, the neighboring cell coordinated with the serving cell) to transmit the same signal at the same time-frequency resource location, and convert the interference of the coordinated neighboring zone into a useful signal. To improve the user's receiving signal to interference and noise ratio.

Currently, the main mode of implementing the JT technology is: the UE needs to measure the channel of the serving cell and the coordinated neighboring cell, and calculates a precoding weight that can be used for the serving cell to transmit data in the single cell mode according to the measured channel information. The matrix, and the JT precoding weight matrix W for jointly transmitting the serving cell and the coordinated neighboring cell, W, may include a precoding weight matrix used by the serving cell in the JT mode and a precoding weight matrix used by the coordinated neighboring cell . Then, the UE sends a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and a Channel Quality Indicator (CQI) to the serving cell, and each of the precoding matrices obtained by the UE and the measurement are reported. Channel information. The serving cell schedules the time-frequency resource according to the information reported by the UE, and sends the scheduling result, the to-be-sent data, and the JT pre-coding weight matrix W to the coordinated neighboring area to apply for the JT to the coordinated neighboring area. The coordinated neighboring area judges whether to agree to perform JT according to the scheduling result, and then feeds back the judgment result to the serving cell. After receiving the judgment result of the feedback of the coordinated neighboring cell, if the application determines that the application is successful, the serving cell and the coordinated neighboring cell send data to the UE according to the JT precoding weight matrix W; if the application fails, the serving cell will be in the JT mode. The precoding weight matrix is switched to the precoding weight matrix in the single cell mode, and then the data is transmitted to the UE according to the precoding weight matrix in the single cell mode.

However, under the distributed radio access network (DRAN) architecture, there are millisecond delays between base stations, and the delay may cause information to be shared between the serving cell and the coordinated neighboring cell in real time. Due to the current precoding weight matrix design, the precoding weight matrix used by the serving cell in JT mode and single cell mode is different. Therefore, the serving cell must determine the mode of precoding weight matrix that should be adopted after receiving feedback from the coordinated neighboring cell. If the application of the serving cell fails, the serving cell needs to switch the precoding weight matrix. This process increases the transmission delay, which may cause the channel information to expire.

Summary of the invention

The present application provides a method, a device and a system for generating a JT precoding weight matrix, which can reduce transmission delay and avoid expiration of channel information.

In a first aspect, the application provides a method for generating a JT precoding weight matrix, including: network side devices acquiring r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ , where r ₁ represents a serving cell of the UE. The number of transmission layers, ₁ ≤ r ₁ ≤ min {TxNum, RxNum}, r ₁ is an integer, TxNum represents the number of antennas configured by the serving cell and the coordinated neighboring cell of the UE, RxNum represents the number of antennas configured by the UE, and r ₂ represents The number of transmission layers of the coordinated neighboring cell of the UE, 0≤r ₂ ≤min{TxNum, RxNum}, r ₂ is an integer, and w ₁ is a complex matrix calculated according to the channel information h ₁ of the serving cell of the user equipment UE, w ₂ and h _₁ w ₁ or w ₃ h ₂ complex matrix is orthogonal, w ₃ satisfies the equation _{_{_{h 2 w 3 = h 1 w}}} 1 diag (α i), diag (α i) α _i is represented by a diagonal a diagonal matrix of elements, α _i is a normalization factor, 1 ≤ _i ≤ r ₁ , h ₂ represents channel information of the cooperative neighboring area; the network side device generates a JT precoding weight matrix, and the JT precoding weight TxNum matrix including r rows All zero ₂ subarray of a first sub-array precoding weights, precoding weights of the second and the third sub-array subarray precoding weights, precoding weights to the first sub- W ₁ is generated according to the same as the precoding weight matrix of the first precoding weights to the serving cell sub-array used in the single-cell mode, the first sub-array precoding weights and the sub-array for the all zero The serving cell performs a precoding operation, the second precoding weight sub-array is generated according to w ₂ , the third pre-coding weight sub-array is generated according to w ₃ , the second pre-coding weight sub-array and the third pre-coding The weight sub-array is used for the cooperative neighboring area to perform a precoding operation.

The method for generating a JT precoding weight matrix provided by the present application is designed to be the same as the precoding weight matrix used in the single cell mode by designing the first precoding weight sub-array used by the serving cell in the JT mode. The precoding weight matrix used by the serving cell does not change whether in JT mode or single cell mode. Therefore, after applying for joint transmission to the coordinated neighboring cell, the serving cell can use the first precoding weight sub-array to send data to the UE on the scheduled time-frequency resource without waiting for receiving feedback of the coordinated neighboring cell, thereby reducing The transmission delay avoids the expiration of channel information.

Optionally, after the network side device obtains r ₁ , r ₂ , w ₁ , w _{2 ,} and w _{3 ,} before the network side generates the JT precoding weight matrix, the method further includes: the network side device pair w ₁ , w ₂ and w ₃ perform conversion processing such that w ₁ , w _{2 ,} and w ₃ satisfy the constraint:

among them,

a conjugate transposed matrix representing w ₁ ,

a conjugate transpose matrix representing w ₂ ,

A conjugate transposed matrix representing w ₃ .

Optionally, the network side device obtains r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ , and specifically includes: the network side device acquires h ₁ and h ₂ , and h ₁ and h ₂ are both RxNum row TxNum columns. the complex matrix; the network side device is calculated according to h ₁ _{r. 1} and v _1, wherein, v ₁ is TxNum row r complex matrix _1; and the network side device calculates r ₂ according to h _2; the network-side apparatus according to h ₁ , h ₂ and v ₁ calculate v ₂ and v ₃ , where v ₂ is a complex matrix of TxNum rows r ₂ columns orthogonal to h ₁ v ₁ or h ₂ v ₃ , v ₃ satisfies the formula h ₂ v ₃ =h ₁ v ₁ diag(α _i ); the network side device determines w ₁ = v ₁ , w ₂ = v ₂ , w ₃ = v ₃ .

In this optional implementation, when the network side device can directly obtain the downlink channel information of the serving cell and the downlink information of the coordinated neighboring cell, the network side device can directly directly base the downlink channel information and the coordinated neighboring cell of the serving cell. The downlink information information calculates respective precoding matrices w ₁ , w _{2 ,} and w ₃ to obtain a JT precoding matrix that is more suitable for the downlink channel of the serving cell and the downlink channel of the coordinated neighboring cell.

Optionally, the network-side apparatus acquires _{_{_{r 1, r 2, w 1}}} , w 2 and w _3, specifically comprises: the network side device receiving report information transmitted from the UE, the reported information comprises a first code word number, second codeword numbers third codeword numbers r ₁ and r _2; the network-side apparatus according to a first r ₁ and the codeword number determining w _1, and r ₂ in accordance with the second code word number determining w _2, And determining w ₃ according to r ₂ and the third codeword number.

In this optional implementation, each precoding matrix v ₁ , v _{2 ,} and v ₃ may be calculated by the UE based on the downlink channel information of the serving cell and the downlink channel information of the coordinated neighboring cell, by using v ₁ , v _{2 ,} and v ₃ codeword corresponding to each number to the network side device, so that the network device to determine w _1, w ₂ and w ₃ in accordance with the corresponding code words of a coding, thereby avoiding the use of large amounts of uplink transmission resource, transmission efficiency is improved.

In a second aspect, the present application provides a method for generating a JT precoding weight matrix, including: acquiring, by a UE, channel information h _{1 of} a serving cell of the UE, and channel information h ₂ , h ₁ of the coordinated neighboring cell of the UE. h ₂ are complex matrix row TxNum RxNum column, indicates the number of antennas TxNum the serving cell and the neighboring cooperative configuration, RxNum indicates the number of antennas configured for the UE; UE calculates the r ₁ and v ₁ according to h _1, wherein, v ₁ is TxNum row r of _a complex matrix, r ₁ is transmitted for the serving cell _{layers, 1≤r 1 ≤min {TxNum, RxNum} }, r 1 is an integer; the UE h ₂ calculated according to the co-neighbor transmitting layers _{_{r 2, 0≤r 2 ≤min {TxNum}} , RxNum}, r 2 is an integer; and the UE v ₂ v ₃ calculated according to h _1, h ₂ and v _1, wherein, v ₂ and h ₁ is v ₁ or h ₂ v ₃ TxNum orthogonal complex matrix row _r, column _2, v ₃ satisfies the equation _{_{_{h 2 v 3 = h 1 v}}} 1 diag (α i), diag (α i) α _i is represented by diagonal line elements diagonal matrix, α _i is a normalization factor, 1≤i≤r _1; V ₁ the UE would obtain the quantization matrix w _1, w and to determine a first codeword number _1, w ₁ for generating JT Precoding weight matrix for the serving cell A first sub-array precoding weights of the precoding operation; v ₂ the UE will obtain a quantization matrix w _2, w ₂ and determining a second number of codewords, w ₂ for generating the precoding weight matrix JT of the cooperating the second precoding weights performing precoding submatrix neighboring operation; UE will obtain a quantization matrix v ₃ w _3, w third codeword and determines the number _3, w ₃ for generating the precoding weight matrix JT a third pre-coding weight sub-array in which the coordinated neighboring cell performs a precoding operation; the UE sends a report message to the network side device in the serving cell, where the report information includes the first codeword number and the second codeword Number, the third codeword number, r ₁ and r ₂ .

In a third aspect, the application provides a network side device, including: an acquiring unit, configured to acquire r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ , where r ₁ represents a sending layer of a serving cell of a user equipment UE The number, ₁ ≤ r ₁ ≤ min {TxNum, RxNum}, r ₁ is an integer, TxNum represents the number of antennas configured by the serving cell and the coordinated neighboring cell of the UE, RxNum represents the number of antennas configured by the UE, and r ₂ represents the UE sending collaborative neighboring _{layers, 0≤r 2 ≤min {TxNum, RxNum} }, r 2 is an integer, w ₁ according to the channel information h serving cell of the user equipment UE calculates the resulting complex matrix _1, w ₂ is a complex matrix orthogonal to h ₁ w ₁ or h ₂ w ₃ , w ₃ satisfies the formula h ₂ w ₃ =h ₁ w ₁ diag(α _i ), and diag(α _i ) denotes a diagonal element of α _i The diagonal matrix, α _i is a normalization factor, 1 ≤ _i ≤ r ₁ , h ₂ represents channel information of the cooperative neighboring region; and a generating unit is configured to generate a JT precoding weight matrix, the JT precoding weight matrix row r includes TxNum All zero ₂ subarray of a first sub-array precoding weights, precoding weights of the second and the third sub-array subarray precoding weights, precoding weights to the first sub-array According to generate w _1, the same precoding weight matrix precoding weights to the first sub-array and the serving cell is used in single cell mode, the first sub-array precoding weights and the sub-array for the all zero The serving cell performs a precoding operation, the second precoding weight sub-array is generated according to w ₂ , the third pre-coding weight sub-array is generated according to w ₃ , the second pre-coding weight sub-array and the third pre-coding The weight sub-array is used for the cooperative neighboring area to perform a precoding operation.

Optionally, the acquiring unit is further configured to: after obtaining the r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ , before the generating unit generates the JT precoding weight matrix, the pair w ₁ , w _{2 ,} and w ₃ Perform a conversion process such that w ₁ , w _{2 ,} and w ₃ satisfy the constraint:

among them,

a conjugate transposed matrix representing w ₁ ,

a conjugate transpose matrix representing w ₂ ,

A conjugate transposed matrix representing w ₃ .

Optionally, the acquiring unit obtains r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ , and specifically includes: acquiring h ₁ and h ₂ , where h ₁ and h ₂ are complex matrices of the RxNum row TxNum column; ₁ calculates r ₁ and v _1, wherein, v ₁ is TxNum row r complex matrix _one of; h ₂ calculated r _2; calculating v ₂ and v ₃ according to h _1, h ₂ and v _1, wherein, v ₂ is a complex matrix of TxNum rows r ₂ columns orthogonal to h ₁ v ₁ or h ₂ v ₃ , v ₃ satisfying the formula h ₂ v ₃ =h ₁ v ₁ diag(α _i ); determining w ₁ =v ₁ ,w ₂ =v ₂ , w ₃ = v ₃ .

Optionally, the obtaining unit, where r ₁ , r ₂ , w ₁ , w _{2 ,} and w _{3 are obtained} , specifically includes: receiving the report information sent by the UE, where the report information includes a first codeword number, a second codeword number, third codeword number, r ₁ and r _2; r ₁ according to the first codeword and the number determining w _1, and r ₂ in accordance with the second code word number determining w _2, r _2, and according to the third codeword and The number determines w ₃ .

For technical effects of the network side device provided by the present application, refer to the technical effects of the foregoing first aspect or the implementation manner of the first aspect, and details are not described herein again.

In a fourth aspect, the application provides a UE, including: an acquiring unit, configured to acquire channel information h _{1 of} a serving cell of a UE, and channel information h ₂ , h ₁ and h ₂ of a coordinated neighboring cell of the UE are both RxNum a complex matrix of rows TxNum, TxNum represents the number of antennas configured in the serving cell and the coordinated neighboring cell, RxNum represents the number of antennas configured by the UE, and a calculating unit is configured to calculate r ₁ and v ₁ according to h ₁ acquired by the acquiring unit Where v ₁ is a complex matrix of the R ₁ column of the TxNum row, r _{1 is} the number of transmission layers of the serving cell, 1≤r ₁ ≤min{TxNum, RxNum}, and r ₁ is an integer; the calculation unit is also used for Calculating the number of transmission layers r _{2 of} the cooperative neighboring area according to h ₂ , 0≤r ₂ ≤min{TxNum, RxNum}, and r ₂ is an integer; the calculating unit is further configured to calculate v according to h ₁ , h _{2 ,} and v ₁ ₂ and v ₃ , wherein v ₂ is a complex matrix of TxNum rows r ₂ columns orthogonal to h ₁ v ₁ or h ₂ v ₃ , v ₃ satisfies the formula h ₂ v ₃ =h ₁ v ₁ diag(α _i ) , diag(α _i ) denotes a diagonal matrix with α _i as a diagonal element, α _i is a normalization factor, 1≤i≤r ₁ ; a determining unit for quantifying the v ₁ calculated by the calculating unit Get the moment w _1, w and to determine a first codeword number _1, w ₁ for generating JT precoding weight matrix for the serving cell performing a first pre-encoding weight value of the sub-array of the precoding operation; the determining unit further the second precoding weights v ₂ for the quantization matrix obtained w _2, w ₂ and determining a second number of codewords, w ₂ for generating the precoding weight matrix JT in the coordination neighbor perform precoding operation subarray; the determination unit is further configured to obtain a quantized matrix v ₃ w _3, w third codeword and determines the number _3, w ₃ for generating the precoding weight matrix JT in the coordination neighbor perform precoding a third pre-coding weight sub-array; the sending unit is configured to send the report information to the network side device in the serving cell, where the report information includes the first codeword number and the second codeword determined by the determining unit The number and the third codeword number, and r ₁ and r ₂ calculated by the calculation unit.

For technical effects of the UE provided by the present application, refer to the technical effects of the foregoing second aspect or the implementation manner of the second aspect, and details are not described herein again.

Optionally, in the above first to fourth aspects, w ₁ , w _{2 ,} and w ₃ satisfy the constraint:

among them,

a conjugate transposed matrix representing w ₁ ,

a conjugate transpose matrix representing w ₂ ,

A conjugate transposed matrix representing w ₃ .

[Correct according to Rule 91 21.08.2017]
Optionally, the first precoding weight sub-array is

The second precoding weight subarray

The third precoding weight subarray is

The JT precoding weight matrix is

Or the JT precoding weight matrix is

ρ ₂ and ρ ₃ satisfy the formula

0 represents the all zero subarray.

Optionally, the first precoding weight sub-array is w ₁ , the second pre-coding weight sub-array ρ ₂ w ₂ , and the third pre-encoding weight sub-array is ρ ₃ w ₃ ; the JT pre-coding The weight matrix is

Or the JT precoding weight matrix is

ρ ₂ and ρ ₃ satisfy the formula

0 represents the all zero subarray.

In a fifth aspect, the application further provides a network side device, including: a processor, a memory, a communication interface, and a bus; the communication interface is configured to receive or send a message, and the message is sent to or sent to the UE; the memory is used to a storage computer executing instructions; the processor is connected to the memory and the communication interface through the bus, and when the network side device is running, the processor executes a computer execution instruction stored in the memory to implement the first aspect and the first A method of generating a JT precoding weight matrix as described in various implementations.

In a sixth aspect, the application further provides a UE, including: a processor, a memory, a communication interface, and a bus; the communication interface is configured to receive or send a message, and the message is sent to or sent to a network side device; the memory is used for Storing a computer executing instructions; the processor is coupled to the memory and the communication interface through the bus, and when the UE is running, the processor executes a computer execution instruction stored in the memory to implement the second aspect and the second aspect A method of generating a JT precoding weight matrix as described in various implementations.

In a seventh aspect, the present application also provides a computer storage medium having stored therein instructions that, when run on a computer, cause the computer to perform the methods described in the above aspects.

In an eighth aspect, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.

The ninth aspect, the application further provides a communication system, comprising the network side device according to any one of the third aspect or the third aspect, and the implementation of any one of the fourth aspect or the fourth aspect The UE of the foregoing aspect, or the network side device according to any one of the fifth aspect or the fifth aspect, and the implementation of any one of the sixth aspect or the sixth aspect UE.

DRAWINGS

1 is a schematic diagram of a communication system provided by the present application;

2 is a schematic structural diagram of hardware of a network side device provided by the present application;

FIG. 3 is a schematic structural diagram of a hardware of a UE according to the present application;

4 is a flowchart 1 of an embodiment of a method for generating a JT precoding weight matrix provided by the present application;

FIG. 5 is a second flowchart of an embodiment of a method for generating a JT precoding weight matrix provided by the present application;

6 is a third flowchart of an embodiment of a method for generating a JT precoding weight matrix provided by the present application;

7A is a schematic structural diagram 1 of a network side device provided by the present application;

7B is a schematic structural diagram 2 of a network side device provided by the present application;

7C is a schematic structural diagram 3 of a network side device provided by the present application;

FIG. 8A is a schematic structural diagram 1 of a UE according to the present application; FIG.

FIG. 8B is a schematic structural diagram 2 of a UE according to the present application; FIG.

FIG. 8C is a schematic structural diagram 3 of a UE provided by the present application.

Detailed ways

First, the terms "system" and "network" are used interchangeably herein. In this paper, the term "and" is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and B, which may indicate that A exists separately, A and B exist simultaneously, and B exists separately. Happening. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

When an embodiment of the present invention refers to an ordinal number such as "first", "second", "third" or "fourth", unless it is intended to express the order according to the context, it should be understood as merely distinguishing. use.

Secondly, the method for generating the JT precoding weight matrix provided by the present application can be applied to a Long Term Evolution (LTE) system, LTE advanced (LTE-A), and an evolved system using the LTE system. Such as the fifth generation communication (5G) system, and other wireless communication systems using various wireless access technologies.

The method for generating a JT precoding weight matrix provided by the present application can be applied to a communication system including at least two network side devices and a UE, wherein the at least two network side devices can provide joint transmission for the UE. Exemplarily, the cellular network in the LTE system is taken as an example. As shown in FIG. 1 , a network side device is established in each cell (for example, the cell 1-7), the UE is in the cell 1, and the cell 1 is the serving cell of the UE. The cell 3 is a coordinated neighboring cell of the UE, and the network side device 1 and the network side device 3 in the cell 1 and the cell 3 can provide joint transmission for the UE.

The network side device may be a base station (BS) or a base transceiver station (BTS), and is a device deployed in the radio access network to provide a wireless communication function for the terminal device. In systems using different radio access technologies, the names of devices with base station functions may be different, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the third generation. In a communication (3G) network, it is called a Node B, or it is applied to a fifth-generation communication (5G) system or the like. For convenience of description, in the present application, the devices having the functions of the base station mentioned above are collectively referred to as network side devices.

The UE involved in the present application may include various handheld devices with wireless communication functions, in-vehicle devices, wearable devices, computing devices or other processing devices connected to the wireless modem, and various forms of mobile stations (Mobile Station, referred to as MS), terminal, etc. For convenience of description, in the present application, the devices mentioned above are collectively referred to as UEs.

As shown in FIG. 2, a network side device provided by the present application includes a remote radio unit (RRU), a baseband unit (BBU), and an antenna feeder system.

The RRU includes a digital intermediate frequency module, a transceiver module, a power amplifier, and a filtering module. The digital intermediate frequency module is used for modulation and demodulation of electromagnetic wave transmission signals, digital up-conversion, A/D conversion, etc., the transceiver module completes the conversion of the intermediate frequency signal to the radio frequency signal; and then transmits the radio frequency signal through the antenna port through the power amplifier and the filtering module. Go out. The BBU is used to complete functions such as channel codec, baseband signal modulation and demodulation, and protocol processing. It also provides interface functions with upper layer network elements and completes the processing of the physical layer core technologies, such as OFDM in 3G and OFDM in LTE. /MIMO processing. Day The feed system mainly includes an antenna, and may further include a coupler, a splitter, and the like for transmitting data between other network elements (for example, UEs, network side devices in other cells, and the like) and the RRU.

As shown in FIG. 3, a UE provided by the present application includes a processor, a memory, an RF circuit, and the like.

Wherein, the processor is a control center of the UE, and connects various parts of the entire UE by using various interfaces and lines, and executes by executing or executing software programs and/or modules stored in the memory, and calling data stored in the memory. The UE performs various functions and processes data to monitor the UE as a whole. The processor may include digital signal processor devices, microprocessor devices, analog to digital converters, digital to analog converters, etc., which are capable of distributing the control and signal processing functions of the UE in accordance with their respective capabilities. The RF circuit can be used to send and receive information and process the received information to the processor. Generally, RF circuits include, but are not limited to, an antenna, at least one amplifier, a transceiver, a coupler, an LNA (low noise amplifier), a duplexer, etc., and communicate with other devices through a wireless communication network. The wireless communication may use any communication standard or protocol, including but not limited to a global system of mobile communication (GSM), a general packet radio service (GPRS), and code division multiple access ( Code division multiple access (CDMA), wideband code division multiple access (WCDMA), LTE (long term evolution, long term evolution), Wi-Fi or low power Wi-Fi, and WLAN technology.

FIG. 4 is a flowchart of an embodiment of a method for generating a JT precoding weight matrix provided by the present application, where the method includes the following steps:

In step 401, the network side device acquires r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ .

Where r ₁ represents the number of transmission layers of the serving cell of the UE, that is, the rank of the channel matrix of the serving cell, 1≤r ₁ ≤min{TxNum, RxNum}, and r ₁ is an integer. r ₂ represents a neighboring cooperative transmission layers of the UE, i.e., a channel matrix rank collaboration _{neighboring, 0≤r 2 ≤min {TxNum, RxNum} }, r 2 is an integer.

It should be noted that the network side device is a base station device serving the UE in the serving cell, and the coordinated neighboring cell is a neighboring cell that can cooperate with the serving cell to provide joint transmission for the UE. TxNum represents the number of antennas configured in the serving cell and the coordinated neighboring cell, and RxNum represents the number of antennas configured by the UE.

w ₁ is a complex matrix calculated from the channel information h _{1 of the} serving cell. It should be noted that w ₁ is a precoding matrix used by the serving cell in the JT mode. Based on the design of the codebook in which w ₁ is located, each element in w ₁ may directly represent the weight of one layer of a codeword on one antenna (ie, w ₁ is a precoding weight matrix), or according to the serving cell. The number of transmission layers r ₁ is normalized to w ₁ so that each element can represent a weight (ie, a normalized weight matrix is obtained by normalizing w ₁ ). w ₁ is the same as the precoding matrix used by the serving cell in single cell mode. Therefore, when calculating w ₁ , it can be directly calculated based on the channel information of the serving cell without calculating the channel information of the coordinated neighboring cell.

w ₂ is a complex matrix orthogonal to h ₁ w ₁ or h ₂ w ₃ . w ₃ satisfies the formula h ₂ w ₃ =h ₁ w ₁ diag(α _i ), diag(α _i ) denotes a diagonal matrix with α _i as a diagonal element, α _i is a normalization factor, 1≤i≤ r ₁ . h ₂ represents channel information of the coordinated neighboring cell. w ₂ and w ₃ are precoding matrices used by the cooperative neighbor in JT mode. In order to ensure that the coordinated neighboring cell can complete the joint transmission with the serving cell, when calculating w ₂ and w ₃ , it is required to calculate based on the channel information of the coordinated neighboring cell, the channel information of the serving cell, and the w ₁ used by the serving cell.

In this application, there may be multiple ways for the network side device to obtain r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ . The specific acquisition manner will be described in detail below with reference to the examples in FIG. 5 and FIG. 6 . .

Step 402: The network side device generates a JT precoding weight matrix.

The JT precoding weight matrix includes an all-zero sub-array of the TxNum row r ₂ column, a first pre-encoding weight sub-array, a second pre-encoding weight sub-array, and a third pre-encoding weight sub-array. the encoded sub-array weights w ₁ generation, the same precoding weight matrix to the precoding weight matrix of a first service cell used in the single-cell mode, the first sub-array precoding weights and the all-zero submatrix Performing a precoding operation for the serving cell, the second precoding weight sub-array is generated according to w ₂ , the third pre-coding weight sub-array is generated according to w ₃ , the second pre-coding weight sub-array and the first The three precoding weight sub-arrays are used for the cooperative neighboring area to perform a precoding operation.

In the present application, the JT precoding weight matrix generated by the network side device may also be based on different codebook design forms and different JT precoding mapping rules (ie, the antenna of the serving cell and the arrangement of the antennas of the coordinated neighboring cell). Have different forms.

Exemplarily, if the codebook design method is that each precoding matrix in the codebook is a 酉 matrix, and the normalization process is not performed, the w ₁ , w _{2 ,} and w ₃ acquired by the network side device are all 酉 arrays, that is, Restrictions:

among them,

a conjugate transposed matrix representing w ₁ ,

a conjugate transpose matrix representing w ₂ ,

A conjugate transposed matrix representing w ₃ . Then, in the process of generating the JT precoding weight matrix according to w ₁ , w _{2 ,} and w ₃ , the sub-array used by the serving cell and the coordinated neighboring cell in the JT precoding weight matrix needs to be performed according to the corresponding number of transmitting layers. The normalization process is performed to ensure that the total transmission power of the serving cell and the coordinated neighboring cell when transmitting data is 1.

[Correct according to Rule 91 21.08.2017]
Therefore, the JT precoding weight matrix W generated by the network side device according to w ₁ , w _{2 ,} and w ₃ may be the first form:

Or for Form 2:

.

[Correct according to Rule 91 21.08.2017]
Where 0 is the all-zero sub-array, and the first pre-encoding weight sub-array is

Second precoding weight subarray

The third precoding weight subarray is

. ρ ₂ and ρ ₃ represent power allocation factors, and by setting the values of ρ ₂ and ρ ₃ , the transmission powers of the two code words in the cooperative neighbor zone can be allocated. For example, when ρ ₂ = ρ ₃ =1, the cooperative neighboring area can be controlled to evenly distribute the transmission power of two code words. In the present application, the values of ρ ₂ and ρ ₃ can be set according to actual needs, and the values of ρ ₂ and ρ ₃ are satisfied to satisfy the formula.

Optionally, after w ₁ , w _{2 ,} and w ₃ obtained by the network side device, whether the w ₁ , w _{2 ,} and w ₃ meet the foregoing constraints, the network side device may perform the acquired w ₁ , w _{2 ,} and w ₃ . The conversion treatment is such that w ₁ , w ₂ and w ₃ both satisfy the above constraints. The JT precoding weight matrix shown in the above Form 1 or Form 2 is then generated using w ₁ , w ₂ and w ₃ after the processing.

Optionally, if the codebook is designed in such a manner that each precoding matrix in the codebook has been normalized, that is, each precoding matrix in the codebook is a precoding weight matrix. Then, w ₁ can be directly used as the first precoding weight sub-array used by the serving cell in the JT precoding weight matrix, that is, the JT precoding weight matrix W generated by the network side device can be the third form.

Or for Form 4:

Where ρ ₂ w ₂ is a second precoding weight sub-array and ρ ₃ w ₃ is a third pre-coding weight sub-array.

In the present application, the JT precoding weight matrix W is a triangular matrix. When performing joint transmission, the network device in the serving cell can obtain the first precoding weight sub-array and the whole from W by mapping the W. The zero subarray performs a precoding operation. The network side device in the coordinated neighboring cell obtains the second precoding weight sub-array and the third pre-coding weight sub-array from W to perform pre-coding operation by mapping the W.

[Correct according to Rule 91 21.08.2017]
For the serving cell, since the first precoding weight sub-array is the same as the precoding weight matrix used in the single cell mode (both w ₁ or

), whether in the JT mode or the single cell mode, the precoding weight matrix used by the serving cell does not change. That is, after the serving cell applies for joint transmission to the coordinated neighboring area, whether the coordinated neighboring area allows joint transmission does not affect the signal sent by the serving cell. Therefore, after applying for joint transmission to the coordinated neighboring cell, the serving cell can use the first precoding weight sub-array to send data to the UE on the scheduled time-frequency resource without waiting for receiving feedback of the coordinated neighboring cell, thereby reducing The transmission delay avoids the expiration of channel information.

The beneficial effects of the JT precoding weight matrix designed by the present application will be described below with the received signal of the UE:

[Correct according to Rule 91 21.08.2017]
Exemplarily, it is assumed that in the single cell mode, the data that the network side device in the serving cell needs to send to the UE is x ₁ , and x ₁ is a complex matrix of r ₁ row and 1 column. The precoding matrix used in the serving cell is w ₁ , and w ₁ is a unitary matrix. Therefore, the serving cell needs to multiply the coefficient of w ₁ by using w ₁ for precoding operation.

That is, the precoding weight matrix finally used by the serving cell is

Then, the received signal y _single in the single cell mode received by the UE is:

[Correct according to Rule 91 21.08.2017]

(1)

In the JT mode, the network side device in the serving cell and the network side device in the coordinated neighboring area need to send data to the UE as

Is a complex matrix of r ₁ + r ₂ rows and 1 column. Assuming that the JT precoding weight matrix is W as shown in the above manner 1, where ρ ₂ = ρ ₃ =1, then the received signal y _JT in the JT mode received by the UE is:

[Correct according to Rule 91 21.08.2017]

(2)

Here, I represents interference from the serving cell, I _JT represents interference from the UE's cooperation set, and n represents reception noise of the UE.

[Correct according to Rule 91 21.08.2017]
By comparing equations (1) and (2), it can be seen that the signals received by the UE on the downlink channel of the serving cell are both the JT mode and the single-cell mode.

. That is to say, whether in the single cell mode or the JT mode, the downlink precoding weight matrix used by the serving cell does not change, and the signal transmitted by the serving cell does not change. Therefore, after applying for joint transmission to the coordinated neighboring cell, the serving cell can use the first precoding weight sub-array to send data to the UE on the scheduled time-frequency resource without waiting for receiving feedback of the coordinated neighboring cell, thereby reducing The transmission delay avoids the expiration of channel information.

In addition, in the JT precoding weight matrix provided by the present application, each element in the first precoding weight sub-array and the third pre-coding weight sub-array represents the serving cell and the coordinated neighboring area transmitting codeword 1 The weight of each layer of codeword 1 on each antenna. Each element in the second precoding weight sub-array represents the weight of each layer of codeword 2 on each antenna when the cooperative neighbor transmits the codeword 2.

Then, for the coordinated neighboring cell, the coordinated neighboring cell can enhance the power of the codeword 1 transmitted by the serving cell by using the third precoding weight sub-array, that is, provide power enhancement for the serving cell, so as to reduce the error block of the codeword 1. rate.

In JT mode, the transmission freedom of the system is min{2TxNum, RxNum}. When r ₁ <min{2TxNum, RxNum}, when the serving cell fails to make full use of the transmission freedom when transmitting the codeword 1, the cooperative neighboring area can transmit new data by using the remaining transmission degrees of freedom (for example, formula (2) x ₂ ), thereby increasing the gain of space division multiplexing. When r ₁ =min{2TxNum, RxNum}, the cooperative neighbor does not send new data. That is to say, the cooperative neighboring area can fully utilize the transmission degree of freedom by the second precoding weight sub-array based on the number of transmission layers of the serving cell to improve the gain of space division multiplexing.

It is assumed that the large-scale fading of the UE to the coordinated neighboring cell and the serving cell is the same, r ₁ >0, r ₂ >0, and the total power transmitted by the serving cell and the coordinated neighboring cell is the same. Then, when the UE receives the data jointly sent by the serving cell and the coordinated neighboring cell, the signal energy of the i-th layer of the codeword 1 is

The signal power of the jth layer of codeword 2 is

It can be seen that the power of codeword 1 and codeword 2 are not equal, and the power of codeword 1 is strong. Therefore, for the UE, the codeword 1 can be demodulated by a continuous interference cancellation (SIC) receiver. Compared with the conventional coherent JT two-code word power scheme, the transmission error block rate can be reduced.

The network side device in the above step 401 acquires r ₁ , r ₂ , w ₁ , w _{2 ,} and w in combination with a Time Division Duplexing (TDD) mode and a Frequency Division Duplexing (FDD) mode. The specific manner of ₃ is exemplified. It should be noted that the calculation methods mentioned below are all illustrative examples and do not represent all embodiments of the present application.

In the TDD mode, since the uplink channel and the downlink channel frequency band between the network side device and the UE are consistent, there is reciprocity, that is, the uplink channel and the downlink channel are mutually conjugate transposed. Therefore, the network side device can measure the uplink. The reference signal estimates the downlink channel to obtain channel information of the downlink channel. Then, in the TDD mode, the network side device can directly calculate r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ according to the measured channel information of the serving cell and the channel information of the coordinated neighboring cell.

Exemplarily, based on FIG. 4, as shown in FIG. 5, in the TDD mode, the foregoing step 401 may specifically include:

In step 401a, the network side device acquires h ₁ and h ₂ , and h ₁ and h ₂ are complex matrices of the RxNum row TxNum column.

In the present application, before acquiring the channel information of the serving cell and the channel information of the coordinated neighboring cell, the network side device in the serving cell first determines whether the serving cell and the coordinated neighboring cell satisfy the JT open condition. For example, the RRC layer of the network side device monitors whether the serving cell and the coordinated neighboring cell of the UE satisfy the JT open condition by monitoring the information of the large-scale fading information reporting and the load of the serving cell and the coordinated neighboring cell. For example, the network side device monitors the reporting of the large-scale fading information, and determines that the pilot strength of the coordinated neighboring area is higher than the pilot strength of the serving cell by a preset threshold (ie, an A3 event), and the network side device is It is determined that the JT is allowed to be turned on.

After the serving cell and the coordinated neighboring cell meet the JT open condition, the network side device can configure the Channel State Information-Reference Signal (CSI-RS) measurement information and send the information to the UE and the coordinated neighboring cell. The CSI-RS measurement information is used to instruct the UE to send an uplink reference signal to the serving cell and the coordinated neighboring cell on the specified resource, so that the network side device in the serving cell and the coordinated neighboring cell performs channel estimation according to the uplink reference information sent by the UE.

In order to ensure the quality of the channel estimation, when the UE sends an uplink reference signal to the serving cell on the designated resource, the coordinated neighboring cell is silent on the resource according to the indication of the CSI-RS measurement information (Zero Power, ZP), and the UE is specified. When the resource sends an uplink reference signal to the coordinated neighboring cell, the serving cell is silent on the resource.

The network side device in the serving cell performs measurement by using the uplink reference signal sent by the UE to obtain h ₁ . The network side device in the coordinated neighboring cell measures the uplink reference signal sent by the UE to obtain h ₂ , and sends h ₂ to the network side device in the serving cell.

Step 401b, the network side calculation apparatus according to r ₁ and v ₁ h _1, wherein, v ₁ is TxNum row r of _a complex matrix.

Exemplary, the network side device may calculate the rank h ₁ to determine r _1. The precoding matrix v ₁ represents a precoding matrix that can be used by the serving cell determined by the network side device, in this example, w ₁ = v ₁ . Since the precoding matrix identical to a precoding matrix used in the single-cell mode in the serving cell JT mode, therefore, the network side device may be directly based on h _1, the single cell using the same calculation model calculates v _1.

Step 401c, the network side device is calculated according to h ₂ r _2.

Exemplary, the network side device may calculate the rank h ₂ to determine r _2.

Step 401d, the network side device calculates v ₂ and v ₃ according to h ₁ , h _{2 ,} and v ₁ , where v ₂ is a complex matrix of TxNum rows r ₂ columns orthogonal to h ₁ v ₁ or h ₂ v ₃ , v ₃ satisfies the formula h ₂ v ₃ =h ₁ v ₁ diag(α _i ).

Exemplarily, the matrix pseudo-inverse algorithm is taken as an example, and the network side device adopts a formula.

v ₃ can be calculated from h ₁ , h ₂ and v ₁ which have been obtained. among them,

A conjugate transpose matrix representing h ₂ .

When the network side device calculates v ₂ , it can calculate directly according to h ₁ and v ₁ , or after obtaining v ₃ , it can be calculated according to h ₂ and v ₃ . The network side device may adopt an algorithm such as an orthogonal projection matrix algorithm, a Schmidt orthogonalization algorithm, a Singular Value Decomposition (SVD) algorithm, a QR decomposition method, an eigenvalue decomposition method, a zero forcing algorithm, or the like. V ₂ is calculated in a combination of various algorithms.

Exemplarily, it is assumed that the network side device calculates v ₂ according to h ₂ and v ₃ , taking an orthogonal projection algorithm in combination with the SVD algorithm as an example. The network side device first designs a complex matrix P of RxNum row TxNum columns according to an orthogonal projection algorithm.

among them,

a conjugate transposed matrix representing v ₃ ,

A conjugate transposed matrix representing h ₂ , and I represents an identity matrix.

Then P is multiplied by h _{2 to} obtain a matrix Ph ₂ , and the eigenvector corresponding to r ₂ maximum eigenvalues of Ph ₂ is obtained by the SVD algorithm. That is, by the formula UDV ^H =Ph ₂ , the right singular matrix of Ph ₂ is obtained, where U represents a left singular matrix and D is a diagonal matrix, and the modulus of the diagonal elements in the diagonal matrix is from top left to right. The order is in descending order, and V is the right singular matrix.

After the right singular matrix of Ph ₂ is obtained, it can be determined that the first r ₂ column of the right singular matrix is v ₂ .

In step 401e, the network side device determines w ₁ = v ₁ , w ₂ = v ₂ , w ₃ = v ₃ .

It should be noted that the step 401e is not limited to be performed after the foregoing steps 401a-d, and may be performed during the process of the network side device performing steps 401a-d. For example, after calculating v ₁ , the network side device directly takes v ₁ as w ₁ ; after calculating v ₂ , directly takes v ₂ as w ₂ ; after calculating v ₃ , direct v ₃ will be as w ₃ .

Optionally, in the FDD mode, the network side device cannot estimate the downlink channel by using the uplink reference signal. Therefore, the UE needs to estimate the downlink channel according to the downlink reference signal sent by the network side device, and obtain channel information of the downlink channel. Then, in the FDD mode, a possible implementation manner is that the UE calculates r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ according to the measured channel information of the serving cell and the channel information of the coordinated neighboring cell. .

Exemplarily, based on FIG. 4, as shown in FIG. 6, in the FDD mode, before the step 401, the method further includes:

Step 403: The UE acquires channel information h ₁ of the serving cell of the UE, and channel information h ₂ of the coordinated neighboring cell of the UE.

In this example, after the network side device in the serving cell determines that the serving cell and the coordinated neighboring cell satisfy the JT open condition, the CSI-RS measurement information can be configured and sent to the UE and the coordinated neighboring cell. The CSI-RS measurement information indicates that the UE receives and measures the downlink reference signal sent by the serving cell and the downlink reference signal sent by the coordinated neighboring cell on the specified resource, and obtains h ₁ and h ₂ .

It can be understood that, in order to ensure the quality of the channel estimation, the CSI-RS measurement information indicates that when the serving cell sends the downlink reference signal to the UE, the coordinated neighboring cell is silent; the coordinated neighboring cell sends the downlink reference signal to the UE, and the serving cell is silent.

Illustratively, in the present application,

Step 404, UE is calculated according to h ₁ r ₁ and v _1.

Step 405, UE h ₂ calculated r _2.

In step 406, the UE calculates v ₂ and v ₃ according to h ₁ , h _{2 ,} and v ₁ .

It can be understood that, in the detailed process of the foregoing steps 404-406, the process of calculating r ₁ , r ₂ , w ₁ , w _{2 ,} and w ₃ by the network side device described in steps 401b-401d shown in FIG. 5 may be referred to. I will not repeat them here.

In step 407, the UE quantizes v _{1 to} obtain a matrix w ₁ and determines a first codeword number of w ₁ .

In step 408, the UE quantizes v _{2 to} obtain a matrix w ₂ and determines a second codeword number of w ₂ .

In step 409, the UE quantizes v _{3 to} obtain a matrix w ₃ and determines a third codeword number of w ₃ .

It should be noted that since v ₁ , v _{2 ,} and v ₃ are consecutive quantities, if v ₁ , v _{2 ,} and v _{3 are} directly transmitted to the network side device, a large amount of uplink transmission resources are required. Thus, the transmission can be v _1, v ₂ and v ₃ codeword corresponding to each number.

Exemplarily, the codebook corresponding to r ₁ and r ₂ is pre-configured in the network side device and the UE (assuming the first codebook and the second codebook, if r ₁ =r ₂ , the first codebook and The second codebook is the same codebook. Each codebook includes a plurality of available precoding matrices, and each precoding matrix is configured with a unique codeword number. After the UE obtains v _1, v ₂ and v ₃ in the calculation, v ₁ can be quantized with the first codebook closest to v ₁ precoding matrix w _1, w and to determine a first codeword number _1; and v ₂ is a second quantization codebook closest to V ₂ precoding matrix w _2, W _2, and determines the second code word number; and v ₃ of the second quantization codebook closest to v ₃ precoding matrix w ₃ and determine the third codeword number of w ₃ .

Step 410, UE to the serving cell reports the information of the network side device, the information reported includes a number of the first codeword, the second codeword number, the third codeword number, r ₁ and r _2.

Further, the foregoing step 401 specifically includes:

Step 401f: The network side device receives the report information sent by the UE.

Step 401g, the network-side apparatus according to a first r ₁ and the codeword number determining w _1, and r ₂ in accordance with the second code word number determining w _2, w _3, and determined according to r ₂ and the third codeword number.

The network side device after receiving the report information to find the corresponding codebook according to r _1, and then it is determined that the first codeword corresponding number w ₁ from the codebook. Similarly, the network side device can find a corresponding codebook according to r ₂ , and then determine w ₂ corresponding to the second codeword number and w ₃ corresponding to the third codeword number from the codebook corresponding to r ₂ . .

It can be seen from the foregoing embodiment that, by using the JT precoding weight matrix generated by the present application, the first precoding weight sub-array used by the serving cell in the JT mode is designed to be used in the single cell mode. The precoding weight matrix is the same, so that the precoding weight matrix used by the serving cell does not change whether in the JT mode or the single cell mode. Therefore, after applying for joint transmission to the coordinated neighboring cell, the serving cell can use the first precoding weight sub-array to send data to the UE on the scheduled time-frequency resource without waiting for receiving feedback of the coordinated neighboring cell, thereby reducing The transmission delay avoids the expiration of channel information.

The foregoing provides a description of the solution provided by the present application from the perspective of interaction between the various network elements. It can be understood that each network element, such as a network side device and a UE, etc., in order to implement the above functions, includes hardware structures and/or software modules corresponding to each function. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The application may divide the function modules of the network side device, the UE, and the like according to the foregoing method example. For example, each function module may be divided according to each function, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the present application is schematic, and is only a logical function division, and may be further divided in actual implementation.

FIG. 7A shows a possible structural diagram of the network side device involved in the foregoing embodiment, where the network side device includes: an obtaining unit 701 and a generating unit 702. The obtaining unit 701 is configured to support the network side device to perform step 401 in FIG. 4, steps 401a-401e in FIG. 5, and steps 401f-401g in FIG. 6; the generating unit 702 is configured to support the network side device to perform FIG. 4-6. Step 402. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 7B shows a possible structural diagram of the network side device involved in the above embodiment. The network side device includes a processing module 711 and a communication module 712. The processing module 711 is configured to perform control and management on the actions of the network side device. For example, the processing module 711 is configured to support the network side device to perform steps 401-402 in FIG. 4, steps 401a-401e, 402 in FIG. 5, and FIG. Steps 401f-401g, 402, and/or other processes for the techniques described herein. The communication module 712 is for supporting communication between the network side device and other network entities, such as communication with the functional modules or network entities shown in FIG. The network side device may further include a storage module 713 for storing program codes and data of the network side device.

The processing module 711 can be a processor or a controller, and can be, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 712 can be a transceiver, a transceiver circuit, or a communication interface or the like. The storage module 713 can be a memory.

When the processing module 711 is a processor, the communication module 712 is a transceiver, and the storage module 713 is a memory, the network side device involved in the present application may be the network side device shown in FIG. 7C.

Referring to FIG. 7C, the network side device includes a processor 721, a transceiver 722, a memory 723, and a bus 724. The transceiver 722, the processor 721, and the memory 723 are connected to each other through a bus 724. The bus 724 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. Wait. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 7C, but it does not mean that there is only one bus or one type of bus.

FIG. 8A shows a possible structural diagram of a UE involved in the foregoing embodiment, where the UE includes: an obtaining unit 801, a calculating unit 802, a determining unit 803, and a sending. Unit 804. The obtaining unit 801 is configured to support the UE to perform step 403 in FIG. 6; the calculating unit 802 is configured to support the UE to perform steps 404-406 in FIG. 5; the determining unit 803 is configured to support the UE to perform steps 407-409 in FIG. 6; Unit 804 is configured to support the UE to perform step 410 in FIG. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 8B shows a possible structural diagram of the UE involved in the above embodiment. The UE includes a processing module 811 and a communication module 812. The processing module 811 is configured to perform an action on the UE. Control management, for example, processing module 811 is used to support the UE in performing steps 403-410 of Figure 6, and/or other processes for the techniques described herein. Communication module 812 is used to support communication between the UE and other network entities, such as with the functional modules or network entities shown in FIG. The UE may further include a storage module 813 for storing program codes and data of the UE.

The processing module 811 can be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 812 can be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 813 can be a memory.

When the processing module 88 is a processor, the communication module 812 is a transceiver, and the storage module 813 is a memory, the UE involved in the present application may be the UE shown in FIG. 12C.

Referring to FIG. 8C, the UE includes a processor 821, a transceiver 822, a memory 823, and a bus 824. The transceiver 822, the processor 821, and the memory 823 are connected to each other through a bus 824; the bus 824 may be a PCI bus or an EISA bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8C, but it does not mean that there is only one bus or one type of bus.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

In a specific implementation, the present invention further provides a computer storage medium, wherein the computer storage medium may store a program, where the program may be executed in the embodiments of the method for generating a JT precoding weight matrix provided by the present invention. Some or all of the steps. The storage medium may be a magnetic disk, an optical disk, a read-only memory (English: read-only memory, abbreviated as: ROM) or a random access memory (English: random access memory, abbreviation: RAM).

Those skilled in the art will clearly understand that the techniques in this application can be implemented by means of software plus the necessary general hardware platform. Based on such understanding, the technical solutions in the present application may be embodied in the form of software products in essence or in the form of software products, which may be stored in a storage medium such as ROM/RAM, magnetic Discs, optical discs, etc., include instructions for causing a computer device (which may be a personal computer, server, or VPN gateway, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The same and similar parts between the various embodiments in this specification can be referred to each other. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the description in the method embodiment.

The embodiments of the invention described above are not intended to limit the scope of the invention.

Claims

A method for generating a joint transmission JT precoding weight matrix, comprising:

The network side device acquires r 1 , r 2 , w 1 , w 2 , and w 3 , where r 1 represents the number of transmission layers of the serving cell of the user equipment UE, 1≤r 1 ≤min{TxNum, RxNum}, and r 1 is An integer, TxNum represents the number of antennas configured by the serving cell and the coordinated neighboring cell of the UE, RxNum represents the number of antennas configured by the UE, and r 2 represents the number of transmission layers of the coordinated neighboring cell of the UE, 0≤r 2 ≤min{TxNum, RxNum}, r 2 is an integer, w 1 is a complex matrix calculated according to channel information h 1 of the serving cell of the user equipment UE, and w 2 is orthogonal to h 1 w 1 or h 2 w 3 Complex matrix, w 3 satisfies the formula h 2 w 3 =h 1 w 1 diag(α i ), diag(α i ) denotes a diagonal matrix with α i as a diagonal element, α i is a normalization factor, 1 ≤ i ≤ r 1 , h 2 represents channel information of the cooperative neighboring area;

The network side device generates a JT precoding weight matrix, where the JT precoding weight matrix includes an all-zero sub-array of the TxNum row r 2 column, a first pre-encoding weight sub-array, and a second pre-encoding weight sub-array and precoding weights precoding weights third sub-array, the first precoding weights subarray generated according to w 1, the first sub-array precoding weights used in the serving cell and single-cell mode The value matrix is the same, the first precoding weight sub-array and the all-zero sub-array are used by the serving cell to perform a pre-coding operation, and the second pre-encoding weight sub-array is generated according to w 2 , where the three precoding weights subarray generated according to 3 w, precoding weights to the second sub-array and said third precoding weights for the sub-array cooperating neighboring perform precoding operation.
The method of claim 1 wherein w 1 , w 2 and w 3 satisfy a constraint:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
The method according to claim 1, wherein after the network side device acquires r 1 , r 2 , w 1 , w 2 and w 3 , the network side generates a JT precoding weight matrix, the The method also includes:

The network side device performs conversion processing on w 1 , w 2 , and w 3 such that w 1 , w 2 , and w 3 satisfy the constraint:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
[Correct according to Rule 91 21.08.2017]
The method according to claim 2 or 3, wherein the first precoding weight subarray is
The second precoding weight subarray
The third precoding weight subarray is
;
The JT precoding weight matrix is
Or the JT precoding weight matrix is
, ρ 2 and ρ 3 satisfy the formula
0 represents the all zero subarray.
The method according to claim 1, wherein the first precoding weight sub-array is w 1 , the second pre-coding weight sub-array ρ 2 w 2 , the third pre-encoding weight The subarray is ρ 3 w 3 ;

The JT precoding weight matrix is
Or the JT precoding weight matrix is
ρ 2 and ρ 3 satisfy the formula
0 represents the all zero subarray.
The method according to any one of claims 1-5, wherein the network side device acquires r 1 , r 2 , w 1 , w 2 and w 3 , comprising:

The network side device acquires h 1 and h 2 , and h 1 and h 2 are complex matrices of the RxNum row TxNum column;

The network side device and the computing v 1 r 1 according to h 1, wherein, v 1 is TxNum row r of a complex matrix;

The network side device is calculated according to h 2 r 2;

The network side device calculates v 2 and v 3 according to h 1 , h 2 , and v 1 , where v 2 is a complex matrix of TxNum rows r 2 columns orthogonal to h 1 v 1 or h 2 v 3 , v 3 Satisfying the formula h 2 v 3 =h 1 v 1 diag(α i );

The network side device determines w 1 = v 1 , w 2 = v 2 , w 3 = v 3 .
The method according to any one of claims 1-5, wherein the network side device acquires r 1 , r 2 , w 1 , w 2 and w 3 , comprising:

The network device receiving the report information transmitted by the UE, the reporting information comprises a first code word number, the second number of codewords, third codeword number, r 1 and r 2;

The network-side apparatus according to a first r 1 and the codeword number determining w 1, and r 2 in accordance with the second codeword number determining w 2, r 2, and according to the third codeword and said determined number w 3 .
A method for generating a joint transmission JT precoding weight matrix, comprising:

The user equipment UE acquires channel information h 1 of the serving cell of the UE, and the channel information h 2 , h 1 and h 2 of the coordinated neighboring area of the UE are complex matrices of the RxNum row TxNum column, and TxNum represents the service. The number of antennas configured by the cell and the coordinated neighboring cell, and RxNum represents the number of antennas configured by the UE;

Calculated by the UE and h 1 r 1 v 1, wherein, v 1 is TxNum row r of a complex matrix, r 1 is the number of transmission layers serving cell, 1≤r 1 ≤min {TxNum, RxNum } , r 1 is an integer;

The UE calculates, according to h 2 , the number of transmission layers r 2 of the cooperative neighboring cell, 0≤r 2 ≤min{TxNum, RxNum}, and r 2 is an integer;

The UE calculates v 2 and v 3 according to h 1 , h 2 , and v 1 , where v 2 is a complex matrix of TxNum rows r 2 columns orthogonal to h 1 v 1 or h 2 v 3 , and v 3 satisfies the formula h 2 v 3 =h 1 v 1 diag(α i ), diag(α i ) denotes a diagonal matrix with α i as a diagonal element, α i is a normalization factor, 1≤i≤r 1 ;

The UE obtain the quantization matrix V 1 w 1, w and to determine a first codeword number 1, w 1 for generating JT precoding weights for a first pre-coding matrix of the serving cell performing precoding operation Weight subarray

The second pre-UE will obtain a quantization matrix v 2 w 2, w 2 and determining a second number of codewords, w 2 for generating the precoding weight matrix JT in the collaborative neighboring perform precoding operation Encoding weight sub-array;

The UE quantization matrix obtained v 3 w 3, w third codeword and determines the number 3, w 3 for generating the precoding weight matrix JT in the collaborative neighboring perform precoding operation of the third pre- Encoding weight sub-array;

Sent by the UE to the serving cell reports the information of the network-side apparatus, the report information comprises the first codeword number, the second codeword number, the third codeword number, r 1 and r 2 .
The method of claim 8 wherein w 1 , w 2 and w 3 satisfy a constraint:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
A network side device, comprising:

An obtaining unit, configured to acquire r 1 , r 2 , w 1 , w 2 , and w 3 , where r 1 represents a number of transmission layers of a serving cell of the user equipment UE, 1≤r 1 ≤min{TxNum, RxNum},r 1 is an integer, TxNum represents the number of antennas configured by the serving cell and the coordinated neighboring cell of the UE, RxNum represents the number of antennas configured by the UE, and r 2 represents the number of transmission layers of the coordinated neighboring cell of the UE, 0≤ r 2 ≤ min{TxNum, RxNum}, r 2 is an integer, w 1 is a complex matrix calculated according to channel information h 1 of the serving cell of the user equipment UE, and w 2 is positive with h 1 w 1 or h 2 w 3 The complex matrix of intersections, w 3 satisfies the formula h 2 w 3 =h 1 w 1 diag(α i ), diag(α i ) denotes a diagonal matrix with α i as a diagonal element, α i is a normalization factor , 1≤i≤r 1 , h 2 represents channel information of the coordinated neighboring area;

a generating unit, configured to generate a JT precoding weight matrix, where the JT precoding weight matrix includes an all zero subarray of the TxNum row r 2 column, a first precoding weight subarray, and a second precoding weight subarray and precoding weights precoding weights third sub-array, the first precoding weights subarray generated according to w 1, the first sub-array precoding weights used in the serving cell and single-cell mode The value matrix is the same, the first precoding weight sub-array and the all-zero sub-array are used by the serving cell to perform a pre-coding operation, and the second pre-encoding weight sub-array is generated according to w 2 , where the three precoding weights subarray generated according to 3 w, precoding weights to the second sub-array and said third precoding weights for the sub-array cooperating neighboring perform precoding operation.
The network side device according to claim 10, wherein w 1 , w 2 and w 3 acquired by the obtaining unit satisfy a constraint condition:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
The network side device according to claim 10, characterized in that

The obtaining unit is further configured to, before obtaining r 1, r 2, w 1 , w 2 and w 3 after, JT unit generates precoding weights in the generating matrix of w 1, w 2 and w 3 for The conversion process is such that w 1 , w 2 , and w 3 satisfy the constraint:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
[Correct according to Rule 91 21.08.2017]
The network side device according to claim 11 or 12, wherein the first precoding weight sub-array is
The second precoding weight subarray
The third precoding weight subarray is
;
The JT precoding weight matrix is
Or the JT precoding weight matrix is
, ρ 2 and ρ 3 satisfy the formula
0 represents the all zero subarray.
The network side device according to claim 10, wherein the first precoding weight sub-array is w 1 , the second pre-encoding weight sub-array ρ 2 w 2 , the third pre-coding The weight subarray is ρ 3 w 3 ;

The JT precoding weight matrix is
Or the JT precoding weight matrix is
ρ 2 and ρ 3 satisfy the formula
0 represents the all zero subarray.
The network side device according to any one of claims 10 to 14, wherein the acquiring unit acquires r 1 , r 2 , w 1 , w 2 and w 3 , and specifically includes:

Obtaining h 1 and h 2 , h 1 and h 2 are complex matrices of RxNum row TxNum columns;

The calculation of r 1 h 1 and v 1, wherein, v 1 is TxNum row r of a complex matrix;

The calculated r 2 h 2;

Calculating v 2 and v 3 according to h 1 , h 2 and v 1 , where v 2 is a complex matrix of TxNum rows r 2 columns orthogonal to h 1 v 1 or h 2 v 3 , v 3 satisfies the formula h 2 v 3 = h 1 v 1 diag(α i );

It is determined that w 1 = v 1 , w 2 = v 2 , w 3 = v 3 .
The network side device according to any one of claims 10 to 14, wherein the acquiring unit acquires r 1 , r 2 , w 1 , w 2 and w 3 , and specifically includes:

Receiving information sent by the UE to report, the reporting information comprises a first code word number, the second number of codewords, third codeword number, r 1 and r 2;

1, and r 2 according to the second codeword number determining w 2, and w is determined according to r 1. 3 and the first codeword w is determined according to the number r 2 and the third codeword number.
A user equipment (UE), comprising:

An acquiring unit, configured to acquire channel information h 1 of the serving cell of the UE, and channel information h 2 , h 1 and h 2 of the coordinated neighboring cell of the UE are complex matrices of the RxNum row TxNum column, and TxNum represents the service The number of antennas configured by the cell and the coordinated neighboring cell, and RxNum represents the number of antennas configured by the UE;

Calculation unit for calculating acquisition unit h 1 r 1 and v 1, wherein, V is a complex matrix TxNum row r 1, r is a number of transmission layers of the cell for the service acquisition, 1 ≦ r 1 ≤ min{TxNum, RxNum}, r 1 is an integer;

The calculating unit is further configured to calculate, according to h 2 , the number of transmission layers r 2 of the cooperative neighboring cell, 0≤r 2 ≤min{TxNum, RxNum}, and r 2 is an integer;

The calculating unit is further configured to calculate v 2 and v 3 according to h 1 , h 2 , and v 1 , where v 2 is a complex matrix of TxNum rows r 2 columns orthogonal to h 1 v 1 or h 2 v 3 , v 3 satisfies the formula h 2 v 3 =h 1 v 1 diag(α i ), diag(α i ) denotes a diagonal matrix with α i as a diagonal element, α i is a normalization factor, 1≤i ≤r 1 ;

A determination unit configured to obtain a quantization matrix w 1 obtained by said calculation means calculates v, w, and determining a first codeword number 1, w 1 for generating JT precoding weights for the serving cell matrix Performing a first precoding weight sub-array of the precoding operation;

The determination unit is further configured to obtain quantization matrix v 2 w 2, w 2 and determining a second number of codewords, w 2 for generating the precoding weight matrix JT in the collaborative neighboring perform precoding a second precoding weight sub-array of operation;

The determination unit is further configured to obtain a quantized matrix v 3 w 3, w third codeword and determines the number 3, w 3 for generating the precoding weight matrix JT in the collaborative neighboring perform precoding a third pre-encoding weight sub-array of operation;

a sending unit, configured to send, to the network side device in the serving cell, the report information, where the report information includes the first codeword number, the second codeword number, and the third determined by the determining unit a codeword number, and r 1 and r 2 calculated by the calculation unit.
The UE according to claim 17, wherein the determining units determine that w 1 , w 2 and w 3 satisfy a constraint condition:
among them,
a conjugate transposed matrix representing w 1 ,
a conjugate transpose matrix representing w 2 ,
A conjugate transposed matrix representing w 3 .
A communication system, comprising:

A network side device according to any one of claims 10-16, and a UE as claimed in claim 18 or 19.