CN111130582A

CN111130582A - Method for calculating emission weight in coherent joint emission JT and corresponding device

Info

Publication number: CN111130582A
Application number: CN201811296049.0A
Authority: CN
Inventors: 张鹏程
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2020-05-08
Anticipated expiration: 2038-11-01
Also published as: WO2020088168A1; CN111130582B

Abstract

The embodiment of the application discloses a method for calculating a transmission weight in coherent joint transmission JT and a corresponding device, wherein in the method, a BBU divides channels of RRUs (radio remote units) according to the channel freedom of the connected RRUs; after receiving a channel reference signal transmitted by the RRU for the same UE, determining the original channel impact response of each divided group of channels according to the channel reference signal; determining an initial weight of each group of channels according to the original channel impact response; calculating the equivalent channel impulse response of each group of channels according to the initial weight of each group of channels and the original channel impulse response; and carrying out coherent compensation on the equivalent channel impulse response to obtain the transmission weight of each group of channels. When the scheme disclosed by the embodiment of the application calculates the transmission weight of the RRU in the coherent JT, the connection mode of the RRU and the BBU does not need to be modified, the problem that the connection mode of the RRU and the BBU needs to be modified in the prior art is solved, and manpower and material resources are saved.

Description

Method for calculating emission weight in coherent joint emission JT and corresponding device

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method and a corresponding apparatus for calculating a transmit weight in coherent joint transmit JT.

Background

A coordinated multiple point transmission/reception (CoMP) technology is a technology in which multiple transmission points cooperatively participate in data transmission for a User Equipment (UE), or jointly receive data sent by a UE. The CoMP technique contributes to improvement of communication quality of wireless communication, and is therefore widely used.

Joint Transmission (JT) techniques belong to one of CoMP techniques, and JT techniques can be divided into coherent JT techniques and incoherent JT techniques. In order to implement coherent JT, referring to an application scenario diagram shown in fig. 1, a plurality of Radio Remote Units (RRUs) are generally configured, and a baseband processing Unit (BBU) connected to the RRUs is configured, where one BBU may be generally connected to at least one RRU, and when the number of RRUs is large, a plurality of BBUs are often required to be configured, and each BBU is connected to a different RRU. In the coherent JT process, each RRU is used for jointly participating in data transmission of the UE, each RRU transmits a signal to be transmitted to the UE to a BBU (base band unit) connected with the RRU, the BBU performs weighting processing on the received signal according to the transmission weight of each RRU, and then the signal after weighting processing is transmitted to the UE, so that coherent JT is realized. That is, in the coherent JT process, the transmit weight of each RRU needs to be obtained.

When acquiring the transmission weight of each RRU by the prior art, firstly integrating the interfaces of each RRU to ensure that each RRU is connected to the same BBU; then, each RRU transmits a channel reference signal to the BBU; after receiving the channel reference signal, the BBU determines the channel impact response of each channel of the RRUs according to the channel reference signal, and obtains the transmission weight of each RRU by performing correlation calculation on the channel impact response.

However, in the research process of the present application, the inventor finds that, when the prior art is used to obtain the transmission weight of each RRU, each RRU needs to be connected to the same BBU, that is, the connection mode between the RRUs and the BBU needs to be modified, which consumes more manpower and material resources.

Disclosure of Invention

In order to solve the problems that in the prior art, when a transmission weight of an RRU is calculated, the connection mode between the RRU and a BBU needs to be modified, which results in the consumption of manpower and material resources, and the problem that the calculation amount of the BBU is large, the embodiment of the application discloses a method and a corresponding device for calculating the transmission weight in coherent JT.

In a first aspect, an embodiment of the present application provides a method for calculating transmit weights in coherent joint transmit JT, including:

a baseband processing unit (BBU) divides channels of a Radio Remote Unit (RRU) according to the channel freedom of the RRU connected with the BBU;

after receiving a channel reference signal transmitted by the RRU aiming at the same user equipment UE, the BBU determines the original channel impact response of each divided group of channels according to the channel reference signal;

the BBU determines an initial weight of each group of channels according to the original channel impact response of each group of channels;

the BBU calculates the equivalent channel impact response of each group of channels according to the initial weight of each group of channels and the original channel impact response;

and the BBU performs coherent compensation on the equivalent channel impact response of each group of channels to obtain the transmission weight of each group of channels, wherein the transmission weight of each group of channels is used for representing the transmission weight of the RRU.

By the scheme disclosed by the embodiment of the application, the transmission weight of the RRU in the coherent JT can be obtained, and in a coherent JT scene, each BBU is respectively used for calculating the transmission weight of the RRU connected with the BBU. That is to say, when the scheme disclosed in the embodiment of the present application calculates the transmission weight, it is not necessary to modify the connection manner between the RRUs and the BBUs to connect each RRU to the same BBU, but each BBU calculates the transmission weight of the RRU connected to itself. Therefore, the problem that the connection mode of the RRU and the BBU needs to be modified in the prior art is solved, and manpower and material resources are saved.

Furthermore, in the scheme of the embodiment of the application, each BBU calculates the transmission weight of the RRU connected to the BBU, and it is not necessary to calculate the transmission weights of all RRUs in a BBU in a centralized manner.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the BBU, an initial weight of each group of channels according to the original channel impulse response of each group of channels includes:

the BBU respectively acquires an original channel impact response matrix of each group of channels according to the original channel impact response of each group of channels;

and the BBU carries out matrix decomposition on the original channel impact response matrix of each group of channels respectively, and obtains the initial weight of each group of channels respectively according to the matrix decomposition result.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the BBU calculates the initial weight and the original channel impulse response of each group of channels by using the following formula, and obtains the equivalent channel impulse response of each group of channels:

wherein, R represents the effective rank of the original channel impulse response matrix of the RRU, Nl represents the channel degree of freedom of the channel of the l-th group, M represents the number of receiving ports of the UE, H_l(Nl M) represents the original channel impulse response matrix for the l-th set of channels, W_l(R × Nl) represents the initial weight of the l-th group of channels,

and the equivalent channel impulse response matrix represents the I group of channels, wherein I is a positive integer greater than or equal to 1.

In the scheme disclosed in the embodiment of the present application, when the transmission weight is calculated, an original channel impulse response matrix corresponding to each channel needs to be established. The scheme of the embodiment of the application groups the channels of each RRU, calculates each group of channels respectively, and divides the operation amount in the calculation process of the transmission weight of the RRU into a plurality of groups through grouping, thereby compressing the matrix dimension, further simplifying the operation and improving the calculation speed of the transmission weight. And, the larger the matrix dimension is, the larger the subsequent operand is, the more variables are generated in the operation process, and correspondingly, the BBU needs more memories to store the variables. By compressing the dimensionality of the matrix, the embodiment of the application simplifies the operation, reduces the variables required to be stored by the BBU, and saves the memory overhead of the BBU.

With reference to the first aspect, in a third possible implementation manner of the first aspect, when the number of receiving ports of the UE is greater than 1, the performing, by the BBU, coherent compensation on the equivalent channel impulse response of each group of channels to obtain a transmit weight of each group of channels includes:

the BBU carries out QR decomposition on the equivalent channel impact response of each group of channels respectively to obtain an orthogonal unitary matrix of each group of channels;

the BBU obtains a transposed matrix of the orthogonal unitary matrix of each group of channels, and performs coherent compensation on the transposed matrix through the following formula to obtain a transmission weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

a transpose matrix of an orthogonal unitary matrix representing the l group of channels, R represents an effective rank of an original channel impulse response matrix of the RRU, Nl represents a channel degree of freedom of the l group of channels, W_l(R × Nl) represents the initial weight of the l-th group of channels,

and the transmission weight value of the ith group of channels is represented, wherein l is a positive integer greater than or equal to 1.

Through the steps, the transmitting weight of each group of channels can be obtained under the condition that the number of the receiving ports of the UE is more than 1.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, when the number of receiving ports of the UE is 1, the performing coherent compensation on the equivalent channel impulse response of each group of channels by the BBU to obtain a transmit weight of each group of channels includes:

the BBU performs coherent compensation on the equivalent channel impact response of each group of channels through the following formula to obtain the transmission weight of each group of channels:

wherein, W_l(R × Nl) represents the initial weight of the l-th group of channels,

representing the equivalent channel impulse response of the channel of the ith group in the coherent JT process, R representing the effective rank of the original channel impulse response matrix of the RRU, Nl representing the channel degree of freedom of the channel of the ith group,

the transmit weights for the l-th group of channels are expressed, exp represents an exponential function with a natural constant e as the base, j represents the imaginary symbol, and theta represents the phase of the complex number.

Through the steps, the transmitting weight of each group of channels can be obtained under the condition that the number of the receiving ports of the UE is 1.

With reference to the first aspect, with reference to the first possible implementation manner of the first aspect, with reference to the second possible implementation manner of the first aspect, with reference to the third possible implementation manner of the first aspect, with reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, after the obtaining the transmit weight of each group of channels, the method further includes:

after receiving the transmission signal transmitted by the RRU, the BBU takes the transmission weight of each group of channels corresponding to the RRU as the weighting coefficient of the transmission signal of the RRU, and performs weighting processing on the transmission signal;

and the BBU transmits the weighted transmitting signal to the UE.

In a second aspect, an embodiment of the present application provides an apparatus for calculating transmit weights in coherent joint transmit JT, including:

a transceiver and a processor;

the processor is used for dividing channels of the RRUs according to the channel freedom degree of the RRUs connected with the processor;

the transceiver is used for receiving a channel reference signal transmitted by the RRU aiming at the same User Equipment (UE);

the processor is further configured to determine an original channel impulse response of each divided group of channels according to the channel reference signal, determine an initial weight of each group of channels according to the original channel impulse response of each group of channels, calculate an equivalent channel impulse response of each group of channels according to the initial weight of each group of channels and the original channel impulse response, and perform coherent compensation on the equivalent channel impulse response of each group of channels to obtain a transmission weight of each group of channels, where the transmission weight of each group of channels is used to characterize the transmission weight of the RRU.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, by the processor, an initial weight of each group of channels according to an original channel impulse response of each group of channels includes: respectively acquiring an original channel impulse response matrix of each group of channels according to the original channel impulse response of each group of channels, respectively performing matrix decomposition on the original channel impulse response matrix of each group of channels, and respectively acquiring the initial weight of each group of channels according to the matrix decomposition result.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the processor calculates the initial weight and the original channel impulse response of each group of channels by using the following formula, to obtain the equivalent channel impulse response of each group of channels:

With reference to the second aspect, in a third possible implementation manner of the second aspect, when the number of receiving ports of the UE is greater than 1, the performing coherent compensation on the equivalent channel impulse response of each group of channels by the processor to obtain the transmit weight of each group of channels includes: respectively carrying out QR decomposition on the equivalent channel impulse response of each group of channels to obtain an orthogonal unitary matrix of each group of channels, then obtaining a transposed matrix of the orthogonal unitary matrix of each group of channels, and carrying out coherent compensation on the transposed matrix by the following formula to obtain the transmitting weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, when the number of receiving ports of the UE is 1, the processor performs coherent compensation on the equivalent channel impulse response of each group of channels by using the following formula, to obtain a transmission weight of each group of channels:

In combination with the second surface, with combination of the first possible implementation manner of the second aspect, with combination of the second possible implementation manner of the second aspect, with combination of the third possible implementation manner of the second aspect, with combination of the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, after the transmission weight of each group of channels is obtained, the processor is further configured to, after receiving the transmission signal transmitted by the RRU, perform weighting processing on the transmission signal by using the transmission weight of each group of channels corresponding to the RRU as a weighting coefficient of the transmission signal of the RRU, and transmit the weighted transmission signal to the UE.

In a third aspect, an embodiment of the present application provides an apparatus for calculating transmit weights in coherent joint transmit JT, including:

the channel division module is used for dividing the channel of the RRU according to the channel freedom degree of the RRU connected with the channel division module;

a response determining module, configured to determine, after receiving a channel reference signal transmitted by the RRU for the same user equipment UE, an original channel impulse response of each divided group of channels according to the channel reference signal;

an initial weight determining module, configured to determine an initial weight of each group of channels according to the original channel impulse response of each group of channels;

the response calculation module is used for calculating the equivalent channel impulse response of each group of channels according to the initial weight of each group of channels and the original channel impulse response;

and a transmission weight acquisition module, configured to perform coherent compensation on the equivalent channel impulse response of each group of channels to acquire a transmission weight of each group of channels, where the transmission weight of each group of channels is used to characterize the transmission weight of the RRU.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the initial weight determining module includes:

a response matrix obtaining unit, configured to obtain, according to the original channel impulse responses of each group of channels, an original channel impulse response matrix of each group of channels respectively;

and the response matrix decomposition unit is used for respectively carrying out matrix decomposition on the original channel impact response matrix of each group of channels and respectively obtaining the initial weight of each group of channels according to the matrix decomposition result.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the response calculation module calculates the initial weight of each group of channels and the original channel impulse response by using the following formula, to obtain the equivalent channel impulse response of each group of channels:

With reference to the third aspect, in a third possible implementation manner of the third aspect, when the number of receiving ports of the UE is greater than 1, the transmit weight obtaining module includes:

the QR decomposition unit is used for respectively carrying out QR decomposition on the equivalent channel impact response of each group of channels to obtain an orthogonal unitary matrix of each group of channels;

a transmission weight obtaining unit, configured to obtain a transposed matrix of the orthogonal unitary matrix of each group of channels, and perform coherent compensation on the transposed matrix through the following formula to obtain a transmission weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, when the number of receiving ports of the UE is 1, the transmit weight obtaining module includes:

a coherent compensation unit, configured to perform coherent compensation on the equivalent channel impulse response of each group of channels according to the following formula, to obtain a transmission weight of each group of channels:

the transmission weight of the channel in the first group is expressed, exp represents an exponential function with a natural constant e as a base, j represents an imaginary number symbol, theta represents the phase of a complex number, and l is a positive integer greater than or equal to 1.

With reference to the third aspect, with reference to the first possible implementation manner of the third aspect, with reference to the second possible implementation manner of the third aspect, with reference to the third possible implementation manner of the third aspect, with reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the method further includes: a weighting processing module and a signal transmitting module,

after the transmission weight values of each group of channels are obtained, the weighting processing module is configured to, after receiving a transmission signal transmitted by the RRU, perform weighting processing on the transmission signal by using the transmission weight values of each group of channels corresponding to the RRU as weighting coefficients of the transmission signal of the RRU;

the signal transmitting module is used for transmitting the weighted transmitting signal to the UE.

In a fourth aspect, an embodiment of the present application provides a baseband processing unit BBU, including:

memory, a processor and a computer program stored on the memory and executable on the processor, when executing the computer program, implementing the method according to the first aspect.

In a fifth aspect, embodiments of the present application provide a computer-readable medium, comprising instructions, which when executed on a computer, cause the computer to perform the method according to the first aspect.

By the scheme disclosed by the embodiment of the application, the transmission weight of the RRU in the coherent JT can be acquired, and in a coherent JT scene, each BBU connected with the RRU respectively calculates the transmission weight of the RRU connected with the BBU. That is to say, when the scheme disclosed in the embodiment of the present application calculates the transmission weight of the RRU in the coherent JT, the connection manner between the RRUs and the BBU does not need to be modified, so as to connect each RRU to the same BBU, and each BBU calculates the transmission weight of the RRU connected to itself. Therefore, the problem that the connection mode of the RRU and the BBU needs to be modified in the prior art is solved, and manpower and material resources are saved.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic view of an application scenario of coherent joint transmission JT disclosed in the prior art;

fig. 2 is a schematic diagram of a working flow of a method for calculating transmit weights in coherent joint transmit JT according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a working flow of obtaining a transmit weight of each group of channels in a method for calculating a transmit weight in coherent joint transmit JT disclosed in an embodiment of the present application;

fig. 4 is a schematic diagram of a working flow of a method for calculating transmit weights in coherent joint transmit JT according to an embodiment of the present application;

fig. 5 is a schematic workflow diagram of another method for calculating transmit weights in coherent joint transmit JT according to the embodiment of the present application;

fig. 6 is a schematic flowchart of a method for calculating transmit weights in coherent joint transmit JT according to an embodiment of the present disclosure;

fig. 7 is a schematic flowchart of a method for calculating transmit weights in coherent joint transmit JT according to an embodiment of the present disclosure;

fig. 8 is a schematic workflow diagram of another method for calculating transmit weights in coherent joint transmit JT according to the embodiment of the present application;

fig. 9 is a schematic structural diagram of an apparatus for calculating transmit weights in coherent joint transmit JT according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a BBU disclosed in an embodiment of the present application.

Detailed Description

In order to solve the problem of manpower and material resource consumption caused by the need of modifying the connection mode between the RRU and the BBU when calculating the transmission weight of the RRU in the prior art, the embodiment of the application discloses a method for calculating the transmission weight in coherent joint transmission JT and a corresponding device.

The first embodiment of the present application discloses a method for calculating transmit weights in coherent JT. Referring to the schematic workflow diagram shown in fig. 2, the method for calculating transmit weights in coherent JT includes the following steps:

step S11, the BBU divides the channel of the RRU according to the channel degree of freedom of the RRU connected to the BBU.

In an application scenario of coherent JT, multiple RRUs are often jointly involved in transmitting signals to a UE, and each RRU is connected to a BBU. Wherein, one BBU is often connected with multiple RRUs. In the coherent JT process, the RRUs transmit signals to be sent to the UE to the connected BBUs, and after the BBUs receive the signals transmitted by the RRUs connected with the BBUs, the signals transmitted by the RRUs are weighted according to the transmitting weights of the RRUs to obtain weighted signals, and then the weighted signals are transmitted to the UE.

Wherein, the channel degree of freedom refers to the dimension of the channel, i.e. the number of channels for independently transmitting signals. In the embodiment of the present application, the channel degree of freedom of an RRU refers to the number of channels used by the RRU for independently transmitting signals. The BBU divides the channels of the RRUs into channel groups according to the channel freedom of each RRU, wherein each channel group comprises one or more channels, so that the subsequent calculation of the transmission weight value is carried out on each group of channels.

When dividing the channel of the RRU, various methods may be employed. In one embodiment, when the channels of each RRU are divided, each channel of the RRU may be divided into a group, for example, if an RRU connected to the BBU includes RRU 0 and RRU 1, where RRU 0 has 8 channels for transmitting signals and RRU 1 has 4 channels for transmitting signals, in this case, the channels of RRU 0 may be divided into the same group, and the channels of RRU 1 may be divided into the same group.

In addition, the channel of each RRU can be further divided, so as to reduce the complexity of each group of channels in the calculation process. For example, the channels of RRU 0 may be divided into two groups, each group having 4 channels, and the channels of RRU 1 may be divided into two groups, each group having 2 channels.

In another division method, channels of different RRUs may also be divided into a group. For example, if 5 RRUs are included in the RRUs connected to the BBU, the first RRU has 8 channels for transmitting signals, and each of the other four RRUs has only one channel for transmitting signals, in this case, the channels of the first RRU may be divided into two groups, each group has 4 channels, and the channels of the other four RRUs may also be divided into the same group.

Of course, other ways may also be used to divide the channels, which is not limited in this embodiment of the present application.

Step S12, after receiving the channel reference signal transmitted by the RRU for the same user equipment UE, the BBU determines the original channel impulse response of each divided group of channels according to the channel reference signal.

The original channel impulse response of each group of channels refers to a set of original channel impulse responses of the channels included in the group of channels.

Step S13, the BBU determines the initial weight of each group of channels according to the original channel impact response of each group of channels.

When the initial weight of each group of channels is obtained according to the original channel impulse response of each group of channels, the important features in the original channel impulse response matrix are extracted through matrix decomposition by generally adopting a mode of matrix decomposition on the original channel impulse response matrix, so as to obtain the initial weight of each group of channels.

And step S14, the BBU calculates the equivalent channel impact response of each group of channels according to the initial weight of each group of channels and the original channel impact response.

Step S15, the BBU performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmission weight of each group of channels, where the transmission weight of each group of channels is used to characterize the transmission weight of the RRU.

In this step, the equivalent channel impulse response of each group of channels is subjected to coherent compensation, and the result of the coherent compensation is the transmission weight of the group of channels. The transmission weight of the RRU corresponding to each group of channels can be represented through the transmission weight of each group of channels, so that the signals transmitted by the RRU can be weighted according to the transmission weight of each group of channels.

The embodiment of the application discloses a method for calculating a transmitting weight in coherent JT. In the method, a BBU divides channels of RRUs (radio remote units) according to the channel freedom of the RRUs connected with the BBU; then, after receiving the channel reference signal transmitted by the RRU, the BBU determines the original channel impact response of each group of channels according to the channel reference signal; then, the BBU determines an initial weight of each group of channels according to the original channel impact response of each group of channels, and calculates the equivalent channel impact response of each group of channels according to the initial weight of each group of channels and the original channel impact response; and the BBU performs coherent compensation on the equivalent channel impact response of each group of channels to obtain the transmission weight of each group of channels, and the transmission weight of the RRU is represented by the transmission weight of each group of channels.

In another embodiment of the present application, the operation of determining the initial weight of each group of channels by the BBU according to the original channel impulse response of each group of channels is refined, and the operation includes the following steps:

firstly, the BBU respectively acquires an original channel impact response matrix of each group of channels according to the original channel impact response of each group of channels;

then, the BBU carries out matrix decomposition on the original channel impact response matrix of each group of channels respectively, and obtains the initial weight of each group of channels respectively according to the matrix decomposition result.

The original channel impulse response matrix of the channel acquired by the BBU can be represented by the following formula:

H_l(Nl×M)。

in the above formula, Nl represents the channel degree of freedom of the l-th group of channels, M represents the number of receiving ports of the user equipment UE receiving the signal transmitted by the RRU, and H represents_lAnd (Nl multiplied by M) represents the original channel impulse response of the ith group of channels, H represents the original channel impulse response, and l is a positive integer greater than or equal to 1. Each element included in the original channel impulse response matrix is an original channel impulse response of its corresponding channel when transmitting a signal to its corresponding receiving port, for example, an element in the first row and the first column in the matrix represents a first channel in the ith group of channels, and an original channel impulse response is generated when transmitting a signal to a first receiving port of the UE.

In this embodiment of the present application, the channels of each RRU connected to the BBU may be divided into k groups, and if the channel degree of freedom of the channel of each RRU connected to the BBU is N, then N is N1+ N2+ … + Nk, where N1 is the channel degree of freedom of the first group of channels, N2 is the channel degree of freedom of the second group of channels, and Nk is the channel degree of freedom of the kth group of channels.

In this case, the original channel impulse response matrix of each set of channels acquired by the BBU can be represented by the following formula:

H₁(N1×M),H₂(N2×M),…,H_K(NK×M)。

for example, if the RRUs connected to the BBU are RRU 0 and RRU 1, RRU 0 has 8 channels for transmitting signals, RRU 1 has 4 channels for transmitting signals, and RRU 0 is divided into two groups, each group has 4 channels, the channels of RRU 1 are divided into two groups, each group has 2 channels, N is 12 (i.e., the channel degree of freedom of the channel of each RRU connected to the BBU is 12), k is 4 (i.e., the channel of each RRU connected to the BBU is divided into 4 groups), N1 is 4, N2 is 4, N3 is 2, and N4 is 2.

In addition, M represents the number of receiving ports of the user equipment UE that receives the signal transmitted by the RRU, where M is greater than 1 if the UE receives the signal transmitted by the RRU through multiple receiving ports, and M is equal to 1 if the UE receives the signal transmitted by the RRU through multiple receiving ports.

In addition, according to the above steps, in the scheme disclosed in the embodiment of the present application, when the transmission weight is calculated, the original channel impulse response matrix corresponding to each channel needs to be established. The scheme of the embodiment of the application groups the channels of each RRU, calculates each group of channels respectively, and divides the operation amount in the calculation process of the transmission weight of the RRU into a plurality of groups through grouping, thereby compressing the matrix dimension, further simplifying the operation and improving the calculation speed of the transmission weight. And, the larger the matrix dimension is, the larger the subsequent operand is, the more variables are generated in the operation process, and correspondingly, the BBU needs more memories to store the variables. By compressing the dimensionality of the matrix, the embodiment of the application simplifies the operation, reduces the variables required to be stored by the BBU, and saves the memory overhead of the BBU.

Further, after the original channel impulse response matrix of each group of channels is obtained, the initial weight of each group of channels is obtained by performing matrix decomposition on the original channel impulse response matrix of each group of channels. The original channel impulse response matrix is subjected to matrix decomposition, important features in the original channel impulse response matrix can be extracted, and the important features are used as initial weights of all groups of channels. The matrix decomposition method may adopt an eigenvalue decomposition method or a singular value decomposition method, and the like, which is not limited in the embodiment of the present application.

To elaborate how to calculate the equivalent channel impulse response, as a refinement of the method of fig. 2, another embodiment of the present application is disclosed, in which the BBU calculates the initial weight of each group of channels and the original channel impulse response by the following formula to obtain the equivalent channel impulse response of each group of channels:

wherein, R represents the effective rank of the original channel impulse response matrix of the RRU, Nl represents the channel degree of freedom of the channel of the l-th group, M represents the number of receiving ports of the UE, H_l(Nl M) represents the original channel impulse response matrix for the l-th set of channels, W_l(R × Nl) tableThe initial weight of the l-th group of channels is shown,

and the equivalent channel impulse response matrix of the I group of channels in the coherent JT process is shown, wherein l is a positive integer which is greater than or equal to 1.

R represents an effective rank of an original channel impulse response matrix of each RRU connected to the BBU, that is, if the channel degree of freedom of the channel of each RRU connected to the BBU is N and the number of receiving ports of the user equipment UE that receives the signal transmitted by the RRU is M, the original channel impulse response matrix of each RRU connected to the BBU is H (N × M), each element in the matrix is used to represent an original channel impulse response of the channel corresponding to the element, and R represents an effective rank of H (N × M).

In this case, the equivalent channel impulse response of each group of channels in the coherent JT process can be calculated by the following formula:

in addition, in an actual application scenario, the number of receiving ports used by the UE to receive signals transmitted by the RRU may be 1 or more. According to the different number of the receiving ports, in the embodiment of the application, coherent compensation is performed on the equivalent channel impulse response of each group of channels in different modes, so as to obtain the transmitting weight of each group of channels.

Wherein, when the number of receiving ports of the UE is greater than 1, referring to the schematic diagram shown in fig. 3, the BBU performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmit weight of each group of channels, including the following steps:

step S21, the BBU carries out QR decomposition to the equivalent channel impact response of each group of channels respectively, and obtains the orthogonal unitary matrix of each group of channels.

When performing QR decomposition on the ith group of channels, the following formula may be adopted:

in the above-mentioned formula,

representing an equivalent channel impulse response matrix R of the ith group of channels in a coherent JT process to represent the effective rank of an original channel impulse response matrix of the RRU, representing the channel degree of freedom of the ith group of channels, representing the number of receiving ports of the UE by M,

represents a pair H_l(R.times.M) is subjected to QR decomposition,

represents an orthogonal unitary matrix obtained after QR decomposition of the l-th group of channels,

it represents an upper triangular R matrix with zero diagonal element phase obtained after QR decomposition of the ith group of channels, where l is a positive integer greater than or equal to 1.

In this case, the orthogonal unitary matrix for each channel group can be calculated by the following formula:

step S22, the BBU obtains a transpose matrix of the orthogonal unitary matrix of each group of channels, and performs coherent compensation on the transpose matrix by using the following formula to obtain a transmission weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

In this case, the transmission weight of each group of channels can be calculated by the following formula:

through the operations of step S21 to step S22, the transmission weight of each group of channels can be obtained when the number of receiving ports of the UE receiving the signal transmitted by the RRU is greater than 1.

In addition, when the number of the receiving ports of the UE is 1, the BBU performs coherent compensation on the equivalent channel impulse response of each group of channels, and obtains the transmit weight of each group of channels, including:

the transmit weights for the l-th group of channels are expressed, exp represents an exponential function with a natural constant e as the base, j represents the imaginary symbol, and theta represents the phase of the complex number. In the field of mathematics, it is also common to denote the imaginary symbol by i. In particular, the method comprises the following steps of,

to represent

The phase of this complex number is then determined,

representing an imaginary number

Of the formula e

To the power.

Since the number of receiving ports of the UE receiving the signal transmitted by the RRU is 1, that is, the value of M is 1, the above formula can also be expressed as:

in this case, the transmit weight of each group of channels can be calculated by the above formula.

In order to clarify the aspects of the present application, the following describes the aspects of the present application by way of specific examples.

Referring to the schematic diagram shown in fig. 4, in the first example of the present application, each RRU connected to a BBU needs to transmit a signal to multiple UEs, and the number of receiving ports of a UE, which receives the signal transmitted by the RRU, of each UE is greater than 1. And each RRU connected with the BBU is respectively set as RRU 0 and RRU 1, and the plurality of UEs are respectively set as UE 0 and UE 1. In this example, since signals need to be transmitted to multiple UEs, the same RRU has different initial channel impulse responses to different UEs, and the BBU can calculate transmission weights for different UEs according to the scheme disclosed in the embodiment of the present application.

In this case, the BBU first groups the channels of RRU 0 and RRU 1, and in this grouping, the channel of RRU 0 is divided into one or more channel groups, and the channel of RRU 1 is divided into one or more channel groups. After determining the original channel impulse response of each group of channels for different UEs, calculating the initial weight of each group of channels for different UEs (i.e., UE 0 and UE 1) according to the original channel impulse response of each group of channels for different UEs.

Then, according to the following formula, calculating to obtain the equivalent channel impulse response of each group of channels for different UEs in the coherent JT process:

in this example, the number of receiving ports of the UE is greater than 1, and then, in the coherent JT process, after acquiring the equivalent channel impulse responses of each group of channels for different UEs, QR decomposition is performed on the equivalent channel impulse responses by using the following formula:

after acquiring the transpose matrix of the orthogonal unitary matrix of each group of channels, the BBU performs coherent compensation on the transpose matrix again through the following formula to acquire the transmission weight of each group of channels for different UEs:

referring to the schematic diagram shown in fig. 5, in the second example of the present application, each RRU connected to a BBU needs to transmit a signal to one UE, and the number of receiving ports of the UE, which receives the signal transmitted by the RRU, of the UE is greater than 1. And setting the RRUs connected with the BBU as RRU 0 and RRU 1 respectively.

In this case, the BBU first groups the channels of RRU 0 and RRU 1, and in this grouping, the channel of RRU 0 is divided into one or more channel groups, and the channel of RRU 1 is divided into one or more channel groups. And after determining the original channel impulse response of each group of channels, calculating the initial weight of each group of channels according to the original channel impulse response of each group of channels.

Then, according to the following formula, the equivalent channel impulse response of each group of channels in the coherent JT process is calculated:

since the number of receiving ports of the UE is greater than 1 in this example, after obtaining the equivalent channel impulse response of each group of channels in the coherent JT process, the equivalent channel impulse response is QR decomposed by the following formula:

after acquiring the transpose matrix of the orthogonal unitary matrix of each group of channels, the BBU performs coherent compensation on the transpose matrix again through the following formula to acquire the transmission weight of each group of channels:

referring to the schematic diagram shown in fig. 6, in the third example of the present application, each RRU connected to a BBU needs to transmit a signal to multiple UEs, and the number of receiving ports of a UE, which receives the signal transmitted by the RRU, of each UE is 1. And each RRU connected with the BBU is respectively set as RRU 0 and RRU 1, and the plurality of UEs are respectively set as UE 0 and UE 1. In this example, since signals need to be transmitted to multiple UEs, the same RRU has different initial channel impulse responses to different UEs, and the BBU can calculate transmission weights for different UEs according to the scheme disclosed in the embodiment of the present application.

In this case, the BBU first groups the channels of RRU 0 and RRU 1, and in this grouping, the channel of RRU 0 is divided into one or more channel groups, and the channel of RRU 1 is divided into one or more channel groups. After determining the original channel impulse response of each group of channels for different UEs, calculating the initial weight of each group of channels for different UEs according to the original channel impulse response of each group of channels for different UEs.

in this example, the number of receiving ports of the UE is 1, and after obtaining the equivalent channel impulse responses of each group of channels in the coherent JT process for different UEs, the equivalent channel impulse responses of each group of channels are coherently compensated by the following formula, so as to obtain the transmit weight of each group of channels:

referring to the schematic diagram shown in fig. 7, in the fourth example of the present application, each RRU connected to a BBU needs to transmit a signal to one UE, and the number of receiving ports of the UE that receives the signal transmitted by the RRU is 1. And setting the RRUs connected with the BBU as RRU 0 and RRU 1 respectively.

In this case, the BBU first groups the channels of RRU 0 and RRU 1, and in this grouping, the channel of RRU 0 is divided into one or more channel groups, and the channel of RRU 1 is divided into one or more channel groups. After determining the original channel impulse response of each group of channels, calculating the initial weight of each group of channels according to the original channel impulse response of each group of channels.

in this example, the number of receiving ports of the UE is 1, after obtaining the equivalent channel impulse response of each group of channels in the coherent JT process, coherent compensation is performed on the equivalent channel impulse response of each group of channels by using the following formula, so as to obtain the transmission weight of each group of channels:

referring to the schematic diagram shown in fig. 8, in a fifth example of the present application, each RRU connected to a BBU needs to transmit a signal to multiple UEs, and the number of receiving ports of a UE, which receives the signal transmitted by the RRU, of each UE is greater than 1. Each RRU connected to the BBU is set to be RRU 0, RRU 1, RRU 2, RRU 3, and RRU 4, and the plurality of UEs are UE 0 and UE1, respectively. In this example, since signals need to be transmitted to multiple UEs, the same RRU has different initial channel impulse responses to different UEs, and the BBU can calculate transmission weights for different UEs according to the scheme disclosed in the embodiment of the present application.

In this case, the BBU first groups the channels of RRU 0 and RRU 1, and in this grouping, the channel of RRU 0 is divided into one or more channel groups, and the channels of RRU 1, RRU 2, RRU 3, and RRU 4 are divided into one channel group. After determining the original channel impulse responses of each group of channels for different UEs, calculating the initial weights of each group of channels for different UEs (i.e., UE 0 and UE 1) according to the original channel impulse responses of each group of channels for different UEs.

further, in the scheme disclosed in the embodiment of the present application, after obtaining the transmit weight of each group of channels, the method further includes the following steps:

firstly, after receiving a transmission signal transmitted by the RRU, the BBU performs weighting processing on the transmission signal by using a transmission weight of each group of channels corresponding to the RRU as a weighting coefficient of the transmission signal of the RRU.

Then, the BBU transmits the weighted transmission signal to the UE.

In the embodiment of the application, the transmission weight of the RRU corresponding to the channel is represented by the transmission weight of each group of channels, and in this case, after the transmission signal transmitted by the RRU is obtained, weighting processing can be performed according to the transmission weight of each group of channels corresponding to the RRU.

For example, if the RRUs connected to the BBU include RRU 0 and RRU 1, channels of RRU 0 are divided into two groups, and channels of RRU 1 are divided into four groups, after acquiring the transmission weights of the respective groups of channels, the transmission weights of the two groups of channels corresponding to RRU 0 are used as weighting coefficients of the transmission signals of RRU 0, and the transmission weights of the four groups of channels corresponding to RRU 1 are used as weighting coefficients of the transmission signals of RRU 1, and weighting processing is performed accordingly to acquire the transmission signals after weighting processing, and then the transmission signals after weighting processing are transmitted to the UE. For example, if the transmission weights of two groups of channels corresponding to RRU 0 are c1 and c2, respectively, and the transmission weights of four groups of channels corresponding to RRU 1 are c3, c4, c5, and c6, respectively, the transmission signal after weighting processing may be: transmission signal for RRU 0 (c1+ c2) + transmission signal for RRU 1 (c3+ c4+ c5+ c 6).

In addition, if the RRUs connected to the BBU include RRU 0, RRU 1, RRU 2, RRU 3, and RRU 4, the channel of RRU 0 is divided into two channel groups, and the channels of RRU 1, RRU 2, RRU 3, and RRU 4 are divided into one channel group, in this case, after the transmission signals of RRU 0, RRU 1, RRU 2, RRU 3, and RRU 4 are acquired, the transmission weights of two groups of channels corresponding to RRU 0 are used as the weighting coefficients of the transmission signals of RRU 0, and the transmission weights of one group of channels corresponding to RRU 1, RRU 2, RRU 3, and RRU 4 are used as the weighting coefficients of the transmission signals of RRU 1, RRU 2, RRU 3, and RRU 4, and weighting processing is performed accordingly to acquire the transmission signals after weighting processing, and then the transmission signals after weighting processing are transmitted. For example, if the transmission weights of two groups of channels corresponding to RRU 0 are c1 and c2, respectively, and the transmission weights of a group of signals corresponding to RRU 1, RRU 2, RRU 3, and RRU 4 are c3, the transmission signals after weighting processing may be: transmit signal for RRU 0: (c1+ c2) + (transmit signal for RRU 1+ transmit signal for RRU 2+ transmit signal for RRU 3+ transmit signal for RRU 4) × c 3.

The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.

In this embodiment, an apparatus for calculating transmit weights in coherent joint transmit JT is disclosed, and the apparatus includes: a transceiver and a processor.

Further, in the apparatus for calculating transmit weights in coherent joint transmit JT disclosed in this embodiment of the present application, the determining, by the processor, the initial weights of each group of channels according to the original channel impulse responses of each group of channels includes: respectively acquiring an original channel impulse response matrix of each group of channels according to the original channel impulse response of each group of channels, respectively performing matrix decomposition on the original channel impulse response matrix of each group of channels, and respectively acquiring the initial weight of each group of channels according to the matrix decomposition result.

Further, in the device for calculating transmit weights in coherent joint transmit JT disclosed in the embodiment of the present application, the processor calculates the initial weights and the original channel impulse responses of each group of channels by using the following formula, to obtain the equivalent channel impulse responses of each group of channels:

wherein R represents the RRUEffective rank of original channel impulse response matrix, Nl represents channel degree of freedom of the channel of the l-th group, M represents the number of receiving ports of the UE, H_l(Nl M) represents the original channel impulse response matrix for the l-th set of channels, W_l(R × Nl) represents the initial weight of the l-th group of channels,

Further, in the apparatus for calculating a transmit weight in coherent joint transmit JT disclosed in this embodiment of the present application, when the number of receive ports of the UE is greater than 1, the processor performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmit weight of each group of channels, including: respectively carrying out QR decomposition on the equivalent channel impulse response of each group of channels to obtain an orthogonal unitary matrix of each group of channels, then obtaining a transposed matrix of the orthogonal unitary matrix of each group of channels, and carrying out coherent compensation on the transposed matrix by the following formula to obtain the transmitting weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

Further, in the apparatus for calculating a transmit weight in coherent joint transmit JT disclosed in the embodiment of the present application, when the number of receive ports of the UE is 1, the processor performs coherent compensation on the equivalent channel impulse response of each group of channels by using the following formula to obtain the transmit weight of each group of channels:

Further, in the device for calculating a transmission weight in coherent joint transmission JT disclosed in this embodiment of the present application, after the transmission weights of each group of channels are obtained, the processor is further configured to, after receiving a transmission signal transmitted by the RRU, use the transmission weights of each group of channels corresponding to the RRU as a weighting coefficient of the transmission signal of the RRU, perform weighting processing on the transmission signal, and transmit the transmission signal after the weighting processing to the UE.

Correspondingly, in another embodiment of this application, a device for calculating transmit weights in coherent joint transmit JT is further disclosed, and referring to the schematic structural diagram shown in fig. 9, the device for calculating transmit weights in coherent joint transmit JT includes: a channel division module 110, a response determination module 120, an initial weight determination module 130, a response calculation module 140, and a transmission weight acquisition module 150.

The channel division module 110 is configured to divide channels of a radio remote unit RRU connected to the channel division module according to channel freedom of the RRU;

the response determining module 120 is configured to determine, after receiving a channel reference signal transmitted by the RRU for the same user equipment UE, an original channel impulse response of each divided group of channels according to the channel reference signal;

the initial weight determining module 130 is configured to determine an initial weight of each group of channels according to the original channel impulse response of each group of channels;

the response calculating module 140 is configured to calculate an equivalent channel impulse response of each group of channels according to the initial weight of each group of channels and the original channel impulse response;

the transmission weight obtaining module 150 is configured to perform coherent compensation on the equivalent channel impulse response of each group of channels to obtain a transmission weight of each group of channels, where the transmission weight of each group of channels is used to characterize the transmission weight of the RRU.

By the device disclosed by the embodiment of the application, the transmission weight of the RRU in the coherent JT can be obtained, and in a coherent JT scene, each BBU is respectively used for calculating the transmission weight of the RRU connected with the BBU. That is to say, when the scheme disclosed in the embodiment of the present application calculates the transmission weight, it is not necessary to modify the connection manner between the RRUs and the BBUs to connect each RRU to the same BBU, but each BBU calculates the transmission weight of the RRU connected to itself. Therefore, the problem that the connection mode of the RRU and the BBU needs to be modified in the prior art is solved, and manpower and material resources are saved.

Further, in the apparatus for calculating transmit weights in coherent joint transmit JT disclosed in this embodiment of the present application, the initial weight determining module 130 includes:

H_l(Nl×M)。

in the above formula, Nl represents the channel degree of freedom of the l-th group of channels, M represents the number of receiving ports of the user equipment UE receiving the signal transmitted by the RRU, and H represents_lAnd (Nl multiplied by M) represents the original channel impulse response of the ith group of channels, H represents the original channel impulse response, and l is a positive integer greater than or equal to 1.

Further, in the device for calculating transmit weights in coherent joint transmit JT disclosed in this embodiment of the present application, the response calculating module 140 calculates the initial weights and the original channel impulse responses of each group of channels by using the following formulas, so as to obtain the equivalent channel impulse responses of each group of channels:

In this case, in the apparatus for calculating transmit weights in coherent joint transmit JT disclosed in this embodiment of the present application, when the number of receive ports of the UE is greater than 1, the transmit weight obtaining module 150 includes:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

In addition, in the apparatus for calculating a transmit weight in coherent joint transmit JT disclosed in this embodiment of the present application, when the number of receive ports of the UE is 1, the transmit weight obtaining module 150 includes:

Further, in the apparatus for calculating transmit weights in coherent joint transmit JT disclosed in this embodiment of the present application, the apparatus further includes: a weighting processing module and a signal transmitting module,

Fig. 10 shows a schematic diagram of a possible structure of the baseband processing unit BBU involved in the above embodiment, where the BBU includes: memory, a processor 200, and a computer program stored on the memory and executable on the processor. Further, a transceiver 100 may be included, and the memory may include a random access memory 300, a read only memory 400, and a bus 500. The processor 200 is coupled to the transceiver 100, the random access memory 300 and the read only memory 400 via the bus 500. When the BBU needs to be operated, the BBU is guided to enter a normal operation state by starting a basic input/output system solidified in the read only memory 400 or a bootloader guiding system in an embedded system. After the BBU enters the normal operation state, the application program and the operating system are operated in the random access memory 300, so that the processor executes the computer program to implement the method described in the above embodiments.

Specifically, the processor is configured to divide channels of a radio remote unit RRU connected to the processor according to channel freedom of the RRU;

the transceiver is used for receiving a channel reference signal transmitted by the RRU aiming at the same user equipment UE;

The BBU in the embodiment of the present invention may correspond to the BBU in the embodiment corresponding to fig. 2 to 8, and the processor, the memory, and the like in the BBU may implement the functions of the BBU in the embodiment corresponding to fig. 2 to 8 and/or various steps and methods implemented thereby. For brevity, no further description is provided herein.

In a specific implementation, an embodiment of the present application further provides a computer-readable medium, where the computer-readable medium may store a program, and when the program is executed, the computer-readable medium may implement some or all of the steps of the method for calculating transmit weights in coherent joint transmit JT provided in fig. 2 to 8. The storage medium in any device may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.

The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of the CPU and the NP. The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof. The memory may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.

Those of skill in the art will further appreciate that the various illustrative logical blocks and steps (step) set forth in the embodiments of the present application may be implemented in electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a UE. In the alternative, the processor and the storage medium may reside in different components in the UE.

It should be understood that, in the various embodiments of the present application, the size of the serial number of each process does not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

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 application 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.

All parts of the specification are described in a progressive mode, the same and similar parts of all embodiments can be referred to each other, and each embodiment is mainly introduced to be different from other embodiments. In particular, as to the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple and reference may be made to the description of the method embodiments in relevant places.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, for the … … embodiment, since it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims

1. A method for calculating transmission weight in coherent joint transmission JT is characterized by comprising the following steps:

2. The method of claim 1, wherein the determining, by the BBU, the initial weight of each group of channels according to the original channel impulse response of each group of channels comprises:

3. The method of calculating transmit weight in coherent joint transmit JT according to claim 1, wherein the BBU calculates the initial weight and the original channel impulse response of each group of channels by the following formula to obtain the equivalent channel impulse response of each group of channels:

4. The method of claim 1, wherein when the number of receiving ports of the UE is greater than 1, the BBU performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmit weight of each group of channels, and the method includes:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

5. The method of claim 1, wherein when the number of receiving ports of the UE is 1, the BBU performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmit weight of each group of channels, and the method includes:

6. The method of calculating transmit weights in coherent joint transmit JT according to any of claims 1 to 5, further comprising, after obtaining the transmit weights for each group of channels:

and the BBU transmits the weighted transmitting signal to the UE.

7. A device for calculating transmission weight in coherent joint transmission JT is characterized by comprising:

a transceiver and a processor;

8. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 1,

the processor determines an initial weight of each group of channels according to the original channel impulse response of each group of channels, and the determining includes: respectively acquiring an original channel impulse response matrix of each group of channels according to the original channel impulse response of each group of channels, respectively performing matrix decomposition on the original channel impulse response matrix of each group of channels, and respectively acquiring the initial weight of each group of channels according to the matrix decomposition result.

9. The apparatus of claim 7, wherein the processor calculates the initial weight and the original channel impulse response of each group of channels according to the following formula to obtain the equivalent channel impulse response of each group of channels:

10. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 7,

when the number of the receiving ports of the UE is greater than 1, the processor performs coherent compensation on the equivalent channel impulse response of each group of channels to obtain the transmit weight of each group of channels, including: respectively carrying out QR decomposition on the equivalent channel impulse response of each group of channels to obtain an orthogonal unitary matrix of each group of channels, then obtaining a transposed matrix of the orthogonal unitary matrix of each group of channels, and carrying out coherent compensation on the transposed matrix by the following formula to obtain the transmitting weight of each group of channels:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

11. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 7,

when the number of the receiving ports of the UE is 1, the processor performs coherent compensation on the equivalent channel impulse response of each group of channels by the following formula to obtain the transmitting weight of each group of channels:

12. The apparatus for calculating transmit weights in JT of coherent joint transmit according to any of claims 7 through 11,

after the transmission weight values of each group of channels are obtained, the processor is further configured to, after receiving the transmission signal transmitted by the RRU, perform weighting processing on the transmission signal by using the transmission weight values of each group of channels corresponding to the RRU as a weighting coefficient of the transmission signal of the RRU, and transmit the weighted transmission signal to the UE.

13. A device for calculating transmission weight in coherent joint transmission JT is characterized by comprising:

14. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 13, wherein the initial weight determining module comprises:

15. The apparatus for calculating transmit weight in coherent joint transmit JT according to claim 13, wherein the response calculating module calculates the initial weight and the original channel impulse response of each group of channels by using the following formula to obtain the equivalent channel impulse response of each group of channels:

wherein R represents the original channel impulse response matrix of the RRUEffective rank, Nl representing the channel degree of freedom of the l-th group of channels, M representing the number of receive ports of the UE, H_l(Nl M) represents the original channel impulse response matrix for the l-th set of channels, W_l(R × Nl) represents the initial weight of the l-th group of channels,

16. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 13, wherein when the number of receive ports of the UE is greater than 1, the transmit weight obtaining module comprises:

wherein the content of the first and second substances,

an orthogonal unitary matrix representing the l-th set of channels,

is shown asAnd the transmitting weight values of the channels of the group I, wherein I is a positive integer greater than or equal to 1.

17. The apparatus for calculating transmit weights in coherent joint transmit JT according to claim 13, wherein when the number of receive ports of the UE is 1, the transmit weight obtaining module includes:

18. The apparatus for calculating transmit weights in coherent joint transmit JT according to any of claims 13 to 17, further comprising: a weighting processing module and a signal transmitting module,

19. A baseband processing unit (BBU), comprising:

memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of any one of claims 1 to 6.

20. A computer-readable medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 6.