CN115242320A

CN115242320A - Data transmission method and equipment

Info

Publication number: CN115242320A
Application number: CN202110444186.XA
Authority: CN
Inventors: 张芳; 王成毅; 高慧
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2022-10-25
Also published as: WO2022222820A1

Abstract

The embodiment of the application discloses a data transmission method, which is used for joint correction of network equipment. The method in the embodiment of the application comprises the following steps: the method comprises the steps of sending a first correction signal to a target terminal, wherein the first correction signal is used for indicating the target terminal to feed back first channel quality information, receiving the first channel quality information sent by the target terminal, the first channel quality information is used for determining the channel quality of first network equipment and the target terminal, a first correction compensation coefficient is determined according to the first channel quality information, the first correction compensation coefficient is used for correcting the phase difference between the first network equipment and second network equipment, and the target terminal sends first target data to the target terminal according to the first correction compensation coefficient within the cell coverage range of the first network equipment and the second network equipment. In the embodiment of the application, the calibration by using the terminal feedback information is not limited by the AAU power limitation of the AAU air interface mutual transmission phase calibration sequence, and the implementation complexity is reduced.

Description

Data transmission method and equipment

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a data transmission method and equipment.

Background

As the demand for communication quality continues to increase and the amount of traffic and data continues to increase, it is a challenge to obtain higher throughput with limited spectrum resources.

The improvement of the edge rate is one of the keys for improving the throughput rate of the user, and Coordinated Multiple Points Transmission/Reception (CoMP) is used for realizing the improvement of the quality of a received signal or reducing the interference of the received signal by combining the antennas of a plurality of cells so as to obtain a higher edge throughput rate. In the prior art, in a Transmission scenario of multiple Transmission Reception Points (TRPs) in a CoMP scenario, joint channel correction is performed between multiple Active Antenna Units (AAUs) to ensure that a receiver and a transmitter of each TRP can accurately receive and transmit signals.

When joint correction is performed among a plurality of AAUs, the plurality of AAUs transmit correction reference signals to each other, and due to the protocol specification, the strength of the correction reference signals received among the plurality of AAUs has requirements, that is, the strength of the correction reference signals transmitted among the plurality of AAUs cannot be too high or too low, which limits the use scenario and affects the efficiency of joint correction among the AAUs.

Disclosure of Invention

The embodiment of the application provides a data transmission method and equipment thereof, when joint correction is carried out, first network equipment receives first channel quality information sent by a target terminal, determines a first correction compensation coefficient according to the first channel quality information, and then sends first target data to the target terminal according to the first correction compensation coefficient, correction is not needed in different network equipment, therefore, the sent first correction signal is not limited in strength, and the efficiency of joint correction among the network equipment is improved.

A first aspect of the present application provides a data transmission method.

The first network equipment sends a first correction signal to a target terminal, the first correction signal is used for indicating the target terminal to feed back first channel quality information, the first network equipment receives the first channel quality information sent by the target terminal, the first channel quality information is used for determining the channel quality of the first network equipment and the target terminal, the first network equipment determines a first correction compensation coefficient according to the first channel quality information, the first correction compensation coefficient is used for correcting the phase difference between the first network equipment and the second network equipment, the target terminal is in the cell coverage range of the first network equipment and the second network equipment, and the first network equipment sends first target data to the target terminal according to the first correction compensation coefficient.

In the embodiment of the application, when performing the joint correction, the first network device determines the first correction compensation coefficient according to the first channel quality information sent by the target terminal, and then sends the first target data to the target terminal according to the first correction compensation coefficient, and correction is not required in different network devices, so that there is no limitation on strength of the sent first correction signal, and the efficiency of joint correction between the network devices is improved.

In a possible implementation manner of the data transmission method for the first aspect of the present application, the receiving, by the first network device, second channel quality information sent by the second network device, where the second channel quality information is used to determine channel qualities of the second network device and the target terminal, and the determining, by the first network device, the first correction compensation coefficient according to the first channel quality information includes: the first network device determines a first correction compensation coefficient according to the first channel quality information and the second channel quality information.

In the embodiment of the present application, the first network device determines the first correction compensation coefficient according to the first channel quality information and the second channel quality information, so that consistency is maintained between transmitters and receivers of the first network device and the second network device, and problems of implementation complexity and scenario limitation of an air interface transmission correction sequence are avoided.

Based on the data transmission method for the first aspect of the present application, in a possible implementation manner, the sending, by the first network device, the first correction signal to the target terminal includes: the first network device sends a plurality of first correction signals to the target terminal through the N ports, wherein the ports are sending ports of the first network device.

In the embodiment of the application, a plurality of first correction signals are sent to the target terminal through the N ports, so that the realizability of the scheme is improved.

Based on the data transmission method for the first aspect of the present application, in a possible implementation manner, the sending, by the first network device, the plurality of first correction signals to the target terminal through the N ports includes: the first network device sends a plurality of first correction signals to the target terminal through a first antenna and N ports, wherein the first antenna is an antenna of the first network device.

In the embodiment of the application, the first correction signal is transmitted through one antenna, so that the complexity of transmitting the first correction signal is reduced.

Based on the data transmission method for the first aspect of the present application, in a possible implementation manner, the sending, by the first network device, the plurality of first correction signals to the target terminal through the first antenna and the N ports includes: the method includes that a first network device sends a plurality of first correction signals to a target terminal through a first antenna and N ports at a plurality of phases respectively, and the receiving, by the first network device, first channel quality information sent by the target terminal includes: the first network equipment receives a plurality of first channel quality information sent by a target terminal, and the plurality of first channel quality information respectively correspond to a plurality of first correction signals sent by a plurality of phases.

In the embodiment of the application, the first network device sends a plurality of first correction signals to the target terminal through the first antenna and the N ports at a plurality of phases respectively, and receives a plurality of first channel quality information sent by the target terminal, so that the accuracy of subsequent calculation of the compensation coefficient is improved.

Based on the data transmission method for the first aspect of the present application, in a possible implementation manner, the first channel quality information includes a first rank indicator RI, a first channel quality indicator CQI, and a first precoding matrix indicator PMI, and the method further includes: the first network device obtains a plurality of first spectral effects SE according to the plurality of first RIs and the plurality of first CQIs, the first SE represents a spectral effect corresponding to the first correction signal, the plurality of first spectral effects SE correspond to the plurality of first correction signals sent by the plurality of phases, the first network device determines a target spectral effect according to the plurality of first spectral effects, the target spectral effect is the largest of values corresponding to the plurality of first spectral effects, and the first network device determines the first correction compensation coefficient according to the first channel quality information includes: the first network equipment determines a first correction compensation coefficient according to the first PMI corresponding to the target spectral efficiency.

In the embodiment of the present application, the first network device calculates the compensation coefficient after smoothing filtering according to the PMI information fed back by the terminal, and performs phase correction when sending data, so that consistency is maintained between the transmitter and the receiver of the first network device and the second network device, and the problems of implementation complexity and scenario limitation of an air interface transmission correction sequence are avoided.

A second aspect of the present application provides a data transmission method.

The terminal device receives a first correction signal sent by a first network device, the first correction signal is used for indicating the terminal device to feed back first channel quality information, the terminal device receives a second correction signal sent by a second network device, the second correction signal is used for indicating the terminal device to feed back second channel quality information, the terminal device sends the first channel quality information to the first network device according to the first correction signal, the first channel quality information is used for determining the channel quality of the first network device and the terminal device, the terminal device sends the second channel quality information to the second network device according to the second correction signal, the second channel quality information is used for determining the channel quality of the second network device and the terminal device, the terminal device receives first target data sent by the first network device, the first target data is sent by the first network device according to a first correction compensation coefficient, the first correction compensation coefficient is determined by the first network device according to the first channel quality information, and the first correction compensation coefficient is used for correcting and correcting phase difference between the first network device and the second network device.

In the embodiment of the application, the calibration by using the terminal feedback information is not limited by the AAU power limitation of the AAU air interface mutual transmission phase calibration sequence, and the implementation complexity is reduced.

A third aspect of the present application provides a network device.

A network device, comprising:

the device comprises a sending unit, a receiving unit and a processing unit, wherein the sending unit is used for sending a first correction signal to a target terminal, and the first correction signal is used for indicating the target terminal to feed back first channel quality information;

the receiving unit is used for receiving first channel quality information sent by a target terminal, and the first channel quality information is used for determining the channel quality of first network equipment and the target terminal;

a determining unit, configured to determine a first correction compensation coefficient according to the first channel quality information, where the first correction compensation coefficient is used to correct a phase difference between the first network device and the second network device, and the target terminal is in a cell coverage range of the first network device and the second network device;

the transmitting unit is further used for transmitting the first target data to the target terminal according to the first correction compensation coefficient.

Optionally, the receiving unit is further configured to receive second channel quality information sent by the second network device, where the second channel quality information is used to determine channel qualities of the second network device and the target terminal;

the determining unit is specifically configured to determine a first correction compensation coefficient according to the first channel quality information and the second channel quality information.

Optionally, the sending unit is specifically configured to send a plurality of first correction signals to the target terminal through N ports, where a port is a sending port of the first network device.

Optionally, the sending unit is specifically configured to send a plurality of first correction signals to the target terminal through a first antenna and N ports, where the first antenna is an antenna of the first network device.

Optionally, the sending unit is specifically configured to send a plurality of first correction signals to the target terminal through the first antenna and the N ports in a plurality of phases, respectively;

the receiving unit is specifically configured to receive a plurality of first channel quality information sent by a target terminal, where the plurality of first channel quality information correspond to a plurality of first correction signals sent by a plurality of phases, respectively.

Optionally, the first channel quality information includes a first rank indicator RI, a first channel quality indicator CQI, and a first precoding matrix indicator PMI, and the determining unit is further configured to obtain a plurality of first spectral effects SE according to the plurality of first RIs and the plurality of first CQIs, where the first SE represents a spectral effect corresponding to the first correction signal, and the plurality of first spectral effects SE correspond to the plurality of first correction signals sent by the plurality of phases;

the determining unit is further configured to determine a target spectral efficiency according to the plurality of first spectral efficiencies, where the target spectral efficiency is the largest of the values corresponding to the plurality of first spectral efficiencies;

the determining unit is specifically configured to determine a first correction compensation coefficient according to the first PMI corresponding to the target spectral efficiency.

Operations performed by each unit of the network device in the third aspect of the present application are similar to those performed by the first network device in the first aspect of the present application, and details thereof are not repeated here.

A fourth aspect of the present application provides a terminal device.

A terminal device, comprising:

a receiving unit, configured to receive a first correction signal sent by a first network device, where the first correction signal is used to instruct a terminal device to feed back first channel quality information;

the receiving unit is further configured to receive a second correction signal sent by the second network device, where the second correction signal is used to instruct the terminal device to feed back the second channel quality information;

a sending unit, configured to send first channel quality information to the first network device according to the first correction signal, where the first channel quality information is used to determine channel qualities of the first network device and the terminal device;

the sending unit is further configured to send second channel quality information to the second network device according to the second correction signal, where the second channel quality information is used to determine channel qualities of the second network device and the terminal device;

the receiving unit is further configured to receive first target data sent by the first network device, where the first target data is sent by the first network device according to a first correction compensation coefficient, the first correction compensation coefficient is determined by the first network device according to the first channel quality information, and the first correction compensation coefficient is used to correct a phase difference between the first network device and the second network device.

Operations performed by each unit of the terminal device in the fourth aspect of the present application are similar to those performed by the terminal device in the second aspect of the present application, and details thereof are not repeated here.

A fifth aspect of the present application provides a computer storage medium having stored thereon instructions that, when executed on a computer, cause the computer to perform a method as embodied in the first or second aspect of the present application.

A sixth aspect of the present application provides a computer program product which, when executed on a computer, causes the computer to perform a method as embodied in the first or second aspect of the present application.

In a seventh aspect of the present application, there is provided a network device, including a processor coupled to a memory, where at least one program instruction or code is stored, and the at least one program instruction or code is loaded and executed by the processor, so as to enable the network device to implement the method of the first aspect.

An eighth aspect of the present application provides a terminal device, which includes a processor, the processor is coupled to a memory, and the memory stores at least one program instruction or code, and the at least one program instruction or code is loaded and executed by the processor, so that the terminal device implements the method of the second aspect.

A ninth aspect of the present application provides a chip system, comprising: the chip system comprises at least one processor, a memory and an interface circuit, wherein the memory, the transceiver and the at least one processor are interconnected through a line, and instructions are stored in the at least one memory; the instructions are executed by the processor to perform the method of the first aspect of the present application.

A tenth aspect of the present application provides a chip system, comprising: the chip system comprises at least one processor, a memory and an interface circuit, wherein the memory, the transceiver and the at least one processor are interconnected through a line, and instructions are stored in the at least one memory; the instructions are executed by the processor to perform the method of the second aspect of the present application.

According to the technical scheme, the embodiment of the application has the following advantages:

in the embodiment of the application, when the joint correction is performed, the first network device determines the first correction compensation coefficient according to the first channel quality information sent by the target terminal, and then sends the first target data to the target terminal according to the first correction compensation coefficient, and correction is not required in different network devices, so that the strength of the sent first correction signal is not limited, and the efficiency of the joint correction between the network devices is improved.

Drawings

Fig. 1 is a schematic diagram illustrating a prior art inter-AAU channel calibration provided in an embodiment of the present application;

fig. 2 is a schematic diagram illustrating a calibration of a transmission channel between AAUs according to the prior art provided by an embodiment of the present application;

fig. 3 is a schematic diagram illustrating a calibration of a receiving channel between AAUs in the prior art according to an embodiment of the present application;

FIG. 4 is a schematic diagram illustrating a prior art joint calibration procedure between AAUs according to an embodiment of the present application;

fig. 5 is a schematic diagram of a framework of a data transmission method according to an embodiment of the present application;

fig. 6 is another schematic diagram of a data transmission method according to an embodiment of the present application;

fig. 7 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

fig. 8 is a schematic diagram of a transmitting port of an AAU in the data transmission method according to the embodiment of the present application;

fig. 9 is another schematic flow chart of a data transmission method according to an embodiment of the present application;

fig. 10 is another schematic flow chart of a data transmission method according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 14 is another schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a data transmission method, when performing joint correction, a first network device receives first channel quality information sent by a target terminal, determines a first correction compensation coefficient according to the first channel quality information, and then sends first target data to the target terminal according to the first correction compensation coefficient, and correction is not required in different network devices, so that the sent first correction signal is not limited in strength, and the efficiency of joint correction among the network devices is improved.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Please refer to fig. 1, which is a schematic diagram illustrating a channel calibration between AAUs in the prior art according to an embodiment of the present application.

As the demand for communication quality continues to increase and the amount of traffic and data continues to increase, it is a challenge to obtain higher throughput with limited spectrum resources. The improvement of the edge rate is one of the keys for improving the throughput rate of the user, and Coordinated Multiple Points Transmission/Reception (CoMP) is used for realizing the improvement of the quality of a received signal or reducing the interference of the received signal by combining the antennas of a plurality of cells so as to obtain higher edge throughput rate. Compared with a fourth generation Long term evolution technology (4G Long term evolution,4G LTE), a fifth generation New air interface (5G New radio,5G NR) can better support a multipoint cooperative transmission technology without scrambling codes and cell ID decoupling.

In the TTD system, differences in amplitude-phase and delay characteristics between channels may occur due to actual devices. In order to ensure the accuracy of the transmitted signal and the received signal, it is necessary to ensure the consistency between the transmitter and the receiver of each rf channel of the Active Antenna Unit (AAU), which needs to compensate the amplitude, phase and time delay of each rf channel, i.e. channel correction, to obtain higher gain. A receiver and a transmitter of Multiple Transmission Reception Points (TRPs) in a Coordinated Multiple Points Transmission/Reception (CoMP) also have a problem of inconsistency, which cannot guarantee accurate Reception of signals, resulting in a decrease in user throughput. However, in a multi-TRP transmission scenario, each AAU only performs channel correction in its own AAU, and at the same time, channel correction between TRPs is performed independently, and cannot meet the requirements of joint amplitude, phase and delay calibration of CoMP. Therefore, in order to realize joint coherent transmission of signals of a plurality of AAUs, it is necessary to perform joint channel correction between the AAUs by combining the AAUs of a plurality of transmission points. As shown in fig. 1, in a signal tunnel (back haul), RRU0 and RRU1 perform joint channel correction through a Radio channel (Radio channel), and a compensation parameter α 1 is added to a Radio signal transmitted from RRU1 to RRU0, so that joint channel correction is achieved through the compensation parameter.

In the existing joint channel correction technology, correction sequences sent by the air interfaces of the AAUs are used for correction. In the combined correction, internal correction is carried out in each AAU, correction coefficients of each channel in the AAU are calculated by generating a correction reference signal and transmitting and receiving a correction signal in the AAU to obtain correction compensation, and then the consistency of each channel is ensured.

As shown in fig. 2, in the transmission correction, the AAU generates a correction reference signal, and sends the correction reference signal to the measurement signal receiving channel through the channels 0 to N, and further calculates a correction coefficient of each channel in the AAU to obtain correction compensation, thereby ensuring consistency of each channel when transmitting signals.

As shown in fig. 3, in the receiving correction, the AAU receives the correction signal sent by the measurement signal transmission channel through the channels 0 to N, and further calculates the correction coefficient of each channel in the AAU to obtain correction compensation, thereby ensuring the consistency of the transmission signal of each channel.

As shown in fig. 4, after the AAU internal calibration, the air interfaces between the AAUs transmit to each other. Firstly, AAU1 transmits, AAU2 receives the correction reference signal of AAU1 and then exchanges transmission and reception, and AAU2 transmits the correction reference signal AAU1 to receive. And calculating correction coefficient compensation between the AAUs according to a channel correction algorithm baseband, so that the response ratios of the transceiving channels of the

AAUs

1 and 2 are the same, and the amplitude and the phase of the channels between the AAUs are consistent.

As in the prior art, extra resources are required to be configured for transmitting and receiving check sequences to perform the check of the joint air interface channel between AAUs. The complexity of the channel correction algorithm in the design of the radio frequency algorithm is high, and the air interface joint correction further improves the correction complexity. The received signal strength between the AAUs also has requirements, and the AAU air interface joint correction is performed before the signal strength between the AAUs, so that the use scene of the air interface joint correction is limited.

Based on the above problems in the prior art, the present application provides a data transmission method, which implements joint correction between AAUs through information interaction with a terminal, and avoids the limitation of signal strength for joint correction between AAUs.

Please refer to fig. 5, which is a block diagram illustrating a data transmission method according to an embodiment of the present application.

As shown in fig. 5, the framework of the data transmission method provided by the present application includes at least two network devices and a terminal device, where the terminal may receive signals sent by the at least two network devices within a cell range of the at least two network devices.

In an actual application process, the network device may be an Active Antenna Unit (AAU), an evolved nodeB (eNB) in a 4G access technology communication system, a next generation nodeB (gNB) in a 5G access technology communication system, or a base station in a future communication system, for example, a base station of a 6G communication system, which is not limited herein.

The base station signal transmission architecture can be applied to a communication system of a third generation (3G) access technology, and can also be applied to a communication system of a fourth generation (4G) access technology, such as a Long Term Evolution (LTE) access technology; alternatively, the base station signaling architecture may also be applied to a fifth generation (5G) access technology communication system, such as a New Radio (NR) access technology; alternatively, the base station signal transmission architecture may also be applied to communication systems of multiple wireless technologies, for example, communication systems of LTE technology and NR technology. In addition, the base station signaling architecture can also be applied to future-oriented communication technologies, such as a sixth generation (6G) access technology communication system.

The terminal device may be an entity, such as a handset, for receiving or transmitting signals. A terminal device may also be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc. The terminal device may also be an automobile with a communication function, a smart automobile, a mobile phone (mobile phone), a wearable device, a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

As shown in fig. 6, when performing joint correction on TRP1 and TRP2, where TRP1 belongs to AAU1 and TRP2 belongs to AAU2, TRP1 and TRP2 respectively transmit CSI-RS reference signals to the terminal device, and perform joint correction through information (information such as rank indicator RI/channel quality indicator CQI/precoding matrix indicator PMI) fed back by the terminal device, thereby avoiding the signal strength problem caused by performing joint correction between two network devices and ensuring the accuracy of received signals.

Based on the above data transmission framework, the data transmission method in the embodiment of the present application is described in detail below.

Please refer to fig. 7, which is a flowchart illustrating a data transmission method according to an embodiment of the present application.

In this embodiment, the first network device represents the TRP1, and the second network device represents the TRP2, for example, in an actual application process, the first network device and the second network device may have more hardware forms, and the specific details are not limited herein.

In step 701, a first network device sends a first correction signal to a target terminal.

And the first network equipment and the second network equipment mutually establish a cooperative relationship and carry out joint transmission for the target terminal. The first network equipment sends a first correction signal to the target terminal, wherein the first correction signal is used for indicating the target terminal to feed back the first channel quality information.

In a possible implementation manner, when the first correction signal is a CSI-RS signal, the CSI-RS signal is used to instruct the terminal to feed back CSI information corresponding to RANK 1.

In a possible implementation manner, the first network device sends a plurality of first correction signals to the target terminal through N ports, where the N ports are sending ports of the first network device. Specifically, the first network device may send N ports of M ports, where N is smaller than M, and the M ports belong to ports of the first network device. Each different port represents a different frequency domain position, that is, the first network device sends the plurality of first correction signals at the N ports or sends the first correction signals at the N frequency domain positions, respectively. For example, when M equals 2, N equals 1, and the first network device sends the first correction signal through 1 port.

In one possible implementation, N is equal to 2/M, that is, when there are 10 transmission ports, the first network device selects 5 of the transmission ports to transmit the first correction signal.

In a possible implementation manner, the resource for sending the first calibration signal by the first network device may multiplex measurement resources with the same port number, or may configure a dedicated calibration resource to carry the first calibration signal. For example, when the first correction signal is a CSI-RS, the first network device may multiplex measurement CSI-RS resources with the same number of ports, or may configure a resource dedicated for sending the correction CSI-RS, which is not limited herein.

In one possible implementation, the first network device sends a plurality of first correction signals to the target terminal through a first antenna and N ports, where the first antenna belongs to an antenna of the first network device. In an actual application process, the first network device may further send a plurality of first correction signals to the target terminal through the plurality of antennas and the N ports, which is not limited herein.

In one possible implementation manner, the first network device sends a plurality of first correction signals to the target terminal through the first antenna and the N ports at a plurality of phases, respectively, that is, the first network device uses phase offsets on CSI-RS, and different phase offsets are sent on different CSI-RS resources. For example, the first network device transmits the first correction signal by adding phase offsets of-90 °, -45 °,0 °,45 °, and 90 °, respectively, and the CSI-RSs with different phase offsets are time-shared on the CSI-RS resources.

In a possible implementation manner, under the condition that the number of ports for measuring the CSI-RS signal is consistent with the number of ports for phase correcting the CSI-RS signal, the ports for measuring the CSI-RS signal and the ports for phase correcting the CSI-RS signal may be configured by using the same set of CSI-RS without separately configuring, thereby saving corresponding resource overhead. In practical applications, the corrected CSI-RS signal may be configured as a periodic, aperiodic or semi-static CSI-RS signal, which is not limited herein.

In step 702, the second network device sends a second correction signal to the target terminal.

And the first network equipment and the second network equipment mutually establish a cooperative relationship and carry out joint transmission for the target terminal. And the second network equipment sends a second correction signal to the target terminal, wherein the second correction signal is used for indicating the target terminal to feed back second channel quality information, and the target terminal is in the cell coverage range of the first network equipment and the second network equipment.

In one possible implementation, the second network device sends a plurality of second correction signals to the target terminal through (M-N) ports, where the (M-N) ports are sending ports of the second network device. Specifically, the second network device may send the second correction signal using a repeated port with the first network device, that is, send a port other than the N ports sent by the first network device among the M ports, where the M ports belong to the ports of the second network device. Wherein each different port represents a different frequency domain location, that is, the second network device sends the plurality of second correction signals at the (M-N) ports or sends the second correction signals at the (M-N) frequency domain locations, respectively. For example, when M equals 2, N equals 1, and the second network device sends the second correction signal through 1 port.

In one possible implementation, (M-N) is equal to 2/M, i.e. when there are 10 transmission ports, then the second network device selects 5 of them to transmit the second correction signal. As shown in fig. 8, the first network device and the second network device multiplex the same segment of ports. The first network equipment AAU1 sends a first correction signal at an antenna 1 through a port 1 to a port N/2, and the sending energy of the first correction signal is W _1，1 To W _1，N/2 And the transmission energy of the second network device AAU2 at the antenna 2 through the 1 to N/2 ports is adjusted to 0. And when N/2+1 reaches N port, the transmitting energy of the second network equipment from the antenna 2 to the N port through N/2+1 is respectively W _2，1 To W _2，N And the transmitting energy of the first network equipment from the antenna 1 to the N port through the N/2+1 is adjusted to be 0. It should be noted that, in an actual application process, a port sent by the second network device and a port sent by the first network device may be the same, may also be different, or may partially overlap, and a specific limitation is not made herein.

In a possible implementation manner, the resource of the second network device that sends the second correction signal may multiplex measurement resources with the same number of ports, or may configure a dedicated correction resource to carry the second correction signal. For example, when the second correction signal is a CSI-RS, the second network device may multiplex measured CSI-RS resources with the same number of ports, or may configure a resource dedicated for sending the corrected CSI-RS, which is not limited herein.

In a possible implementation manner, the second network device sends a plurality of second correction signals to the target terminal through a second antenna and N ports, where the second antenna belongs to an antenna of the second network device. In an actual application process, the second network device may further send a plurality of first correction signals to the target terminal through a plurality of antennas and (M-N) ports, which is not limited herein.

In a possible implementation manner, under the condition that the number of ports for measuring the CSI-RS signal is consistent with the number of ports for phase correcting the CSI-RS signal, the ports for measuring the CSI-RS signal and the ports for phase correcting the CSI-RS signal may be configured by using the same set of CSI-RS without separately configuring, thereby saving corresponding resource overhead.

In step 703, the target terminal sends first channel quality information to the first network device according to the first correction signal.

After the target terminal receives a first correction signal sent by the first network device, the target terminal obtains first channel quality information according to the first correction signal and sends the first channel quality information to the first network device, wherein the first channel quality information is used for determining the channel quality of the first network device and the target terminal.

Specifically, after the target terminal receives the first correction signal, the target terminal measures the first correction signal and obtains the first channel quality information. The first channel quality information includes at least one of: CQI information, PMI information, and RI information.

In a possible implementation manner, when the target terminal receives the first correction signals sent by the first network device at multiple phase offsets in a time-sharing manner, the target terminal obtains multiple pieces of first channel quality information according to the first correction signals received at different times, and then sends the multiple pieces of first channel quality information to the first network device. For example, the first network device sends first correction signals to the target terminal respectively on the phase offsets of-90 °, -45 °,0 °,45 °, and 90 °, the target terminal correspondingly receives the plurality of first correction signals, the target terminal obtains a plurality of first channel quality information respectively according to the plurality of first correction signals, and then sends the plurality of first channel quality information to the first network device.

And after obtaining the first channel quality information, the target terminal sends the first channel quality information to the first network equipment.

In step 704, the target terminal transmits second channel quality information to the second network device according to the second correction signal.

And after the target terminal receives a second correction signal sent by the second network equipment, the target terminal obtains second channel quality information according to the second correction signal and sends the second channel quality information to the second network equipment, wherein the second channel quality information is used for determining the channel quality of the second network equipment and the target terminal.

Specifically, after the target terminal receives the second correction signal, the target terminal measures the second correction signal and obtains second channel quality information. The second channel quality information includes at least one of: CQI information, PMI information, and RI information.

And after obtaining the second channel quality information, the target terminal sends the second channel quality information to the second network equipment.

In step 705, the second network device sends second channel quality information to the first network device.

After the second network device receives the second channel quality information sent by the target terminal, the second network device sends the second channel quality information to the first network device.

In step 706, the first network device determines a first correction compensation coefficient based on the first channel quality information and the second channel quality information.

After the first network device receives the first channel quality information and the second channel quality information, the first network device determines a first correction compensation coefficient according to the first channel quality information and the second channel quality information, wherein the first correction compensation coefficient is used for correcting a phase difference between the first network device and the second network device.

In a possible implementation manner, when the first channel quality information includes a first rank indicator RI, a first channel quality indicator CQI, and a first precoding matrix indicator PMI, the first rank indicator RI and the first channel quality indicator CQI fed back by the first correction signal sent by the first network device when the phase offset is X1 are RI and CQI respectively _X1，1 And CQI _X1，1 The first network device may be according to the RI _X1，1 And CQI _X1，1 Calculating to obtain a first spectral effect SE _x1,1 . In a more preferred mode, the first correction signal may be sent multiple times when the phase offset is X1, so that multiple sets of first spectral effects are obtained, and then the multiple sets of first spectral effects are filtered to obtain a first average spectral effect value when the offset is X1. In this way, after the first network device respectively sends the first correction signals at different phase offsets, a plurality of first spectrum effect mean values corresponding to the different phase offsets can be obtained, the first network device determines a target spectrum effect according to the plurality of first spectrum effect mean values, and the target spectrum effect is the maximum corresponding value in the plurality of first spectrum effect mean values, namely the optimal spectrum effect in the plurality of first spectrum effect mean values. After the target spectral efficiency is obtained, the first network device compares the first PMI value corresponding to the target spectral efficiency with the PMI value sent by the second network device, and a phase compensation coefficient between the first network device and the second network device can be obtained through calculating by using a phase difference between the first PMI value corresponding to the target spectral efficiency and the PMI value sent by the second network device.

As shown in fig. 9, AAU1 (first network device) and AAU2 (second network device) perform CSI-RS outer layer weight calculation, and AAU1 performs phase offset in combination with CSI-RS time-sharing transmission, when receiving a CSI-RS signal, UE reports CSI measurement information, and after receiving AAU1, performs phase offset calculation, and obtains a phase offset weight, transmits data to UE (i.e., phase compensation at UE level) according to the phase offset weight.

Specifically, as shown in fig. 10, the AAU1 (the first network device) sends CSI-RS signals at a plurality of phase offsets (-90 °, -45 °, · ·, 90 °, and the like), the UE performs feedback after measurement, after multiple measurements, the AAU1 obtains spectral effects SE corresponding to the plurality of phase offsets (-90 °, -45 °, · ·, 90 °, and the like), performs spectral effect filtering after multiple measurements, finally obtains spectral effect averages corresponding to the respective phase offsets, and further performs calculation of phase compensation coefficients by selecting data corresponding to the phase offsets with optimal spectral effects.

In step 707, the first network device transmits the first target data to the target terminal according to the first correction compensation coefficient.

After the first network device calculates the first correction compensation coefficient, the first network device sends first target data to the target terminal according to the first correction compensation coefficient, and the first target data represents data sent by the first network device to the target terminal.

It should be noted that, in this embodiment of the present application, the calculation of the first correction compensation coefficient may also be performed on other network devices, and after the first correction compensation coefficient is calculated, the first correction compensation coefficient is sent to the first network device.

In this embodiment, step 705 is an optional step, that is, the terminal device may directly send the second channel quality information to the first network device, and does not need to forward the second channel quality information through the second network device, so that transmission resources may be saved.

In the embodiment of the application, after the first network device and the second network device confirm the cooperation relationship, different offset phase correction CSI-RSs of N/2 ports are multiplexed and measured by a CSI-RS resource, and the terminal feeds back measurement of the joint phase correction CSI-RS. And the first network equipment calculates the compensation coefficient after smoothing filtering according to the PMI information fed back by the terminal and performs phase correction when sending data, so that consistency is kept between transmitters and receivers of the first network equipment and the second network equipment, and the problems of complexity in realizing an air interface transmission correction sequence and scene limitation are avoided. The method is favorable for ensuring the accuracy of the received signal at the low complexity realization cost in the multi-point cooperative transmission scene. The first network equipment and the second network equipment perform single-user joint transmission, and the phase cancellation condition can not occur after phase correction, so that the user obtains array gain of power gain and BF weight, and the throughput rate of the user is improved.

In the embodiment of the application, the first network device and the second network device are used for jointly sending the CSI-RS, joint phase correction among AAUs is carried out according to PMI information fed back by the terminal, the phase correction CSI-RS can repeatedly measure CSI-RS resources under the condition of the same port number, and overhead caused by sending and receiving of extra check sequences can be reduced. The correction by using the terminal feedback information is not limited by the AAU power limitation of the AAU air interface mutual transmission phase correction sequence, and the realization complexity is reduced. And the multiple measurements are used for carrying out spectrum effect filtering to continue smoothing on phase compensation bias, so that error compensation caused by measurement abnormity is reduced, and the fault tolerance rate is improved.

The data transmission method of the present application is described above, and the network device and the terminal device provided in the embodiments of the present application are described below.

Please refer to fig. 11, which is a schematic structural diagram of a network device according to an embodiment of the present application.

A network device, comprising:

a sending unit 1101, configured to send a first correction signal to a target terminal, where the first correction signal is used to instruct the target terminal to feed back first channel quality information;

a receiving unit 1102, configured to receive first channel quality information sent by a target terminal, where the first channel quality information is used to determine channel qualities of a first network device and the target terminal;

a determining unit 1103, configured to determine, according to the first channel quality information, a first correction compensation coefficient, where the first correction compensation coefficient is used to correct a phase difference between the first network device and the second network device, and the target terminal is within a cell coverage of the first network device and the second network device;

the transmitting unit 1101 is further configured to transmit the first target data to the target terminal according to the first correction compensation coefficient.

Operations executed by each unit in the network device in this embodiment are similar to the operations executed by the first network device in the embodiment shown in fig. 7, and details are not described here again.

A network device, comprising:

Optionally, the method further comprises:

the receiving unit 1102 is further configured to receive second channel quality information sent by the second network device, where the second channel quality information is used to determine channel qualities of the second network device and the target terminal;

the determining unit 1103 is specifically configured to determine a first correction compensation coefficient according to the first channel quality information and the second channel quality information.

Optionally, the sending unit 1101 is specifically configured to send a plurality of first correction signals to the target terminal through N ports, where a port is a sending port of the first network device.

Optionally, the sending unit 1101 is specifically configured to send a plurality of first correction signals to the target terminal through a first antenna and N ports, where the first antenna is an antenna of the first network device.

Optionally, the sending unit 1101 is specifically configured to send a plurality of first correction signals to the target terminal through the first antenna and the N ports at a plurality of phases, respectively;

the receiving unit 1102 is specifically configured to receive a plurality of first channel quality information sent by a target terminal, where the plurality of first channel quality information correspond to a plurality of first correction signals sent by a plurality of phases, respectively.

Optionally, the first channel quality information includes a first rank indicator RI, a first channel quality indicator CQI, and a first precoding matrix indicator PMI, and the determining unit 1103 is further configured to obtain a plurality of first spectral effects SE according to the plurality of first RIs and the plurality of first CQIs, where the first SE represents a spectral effect corresponding to the first correction signal, and the plurality of first spectral effects SE correspond to the plurality of first correction signals sent by the plurality of phases;

the determining unit 1103 is further configured to determine a target spectral efficiency according to the plurality of first spectral efficiencies, where the target spectral efficiency is the largest of the values corresponding to the plurality of first spectral efficiencies;

the determining unit 1103 is specifically configured to determine the first correction compensation coefficient according to the first PMI corresponding to the target spectral efficiency.

Please refer to fig. 12, which is a schematic structural diagram of a terminal device according to an embodiment of the present application.

A terminal device, comprising:

a receiving unit 1201, configured to receive a first correction signal sent by a first network device, where the first correction signal is used to instruct a terminal device to feed back first channel quality information;

the receiving unit 1201 is further configured to receive a second correction signal sent by the second network device, where the second correction signal is used to instruct the terminal device to feed back the second channel quality information;

a sending unit 1202, configured to send first channel quality information to the first network device according to the first correction signal, where the first channel quality information is used to determine channel qualities of the first network device and the terminal device;

the sending unit 1202 is further configured to send second channel quality information to the second network device according to the second correction signal, where the second channel quality information is used to determine channel qualities of the second network device and the terminal device;

the receiving unit 1201 is further configured to receive first target data sent by the first network device, where the first target data is sent by the first network device according to a first correction compensation coefficient, the first correction compensation coefficient is determined by the first network device according to the first channel quality information, and the first correction compensation coefficient is used to correct a phase difference between the first network device and the second network device.

The operations performed by each unit in the terminal device in this embodiment are similar to the operations performed by the target terminal in the embodiment shown in fig. 7, and detailed description thereof is omitted here.

Please refer to fig. 13, which is a schematic structural diagram of a control unit according to an embodiment of the present application.

The processor 1301, the memory 1302, the bus 1305, and the interface 1304, where the processor 1301 is connected to the memory 1302 and the interface 1304, the bus 1305 is connected to the processor 1301, the memory 1302, and the interface 1304, respectively, the interface 1304 is used for receiving or transmitting data, and the processor 1301 is a single-core or multi-core central processing unit, or a specific integrated circuit, or one or more integrated circuits configured to implement the embodiments of the present invention. The memory 1302 may be a Random Access Memory (RAM), or may be a non-volatile memory (non-volatile memory), such as at least one hard disk memory. The memory 1302 is used to store computer-executable instructions. Specifically, the computer-executable instructions may include a program 1303.

Please refer to fig. 14, which is a schematic structural diagram of a control unit according to an embodiment of the present disclosure.

Processor 1401, memory 1402, bus 1405, interface 1404, processor 1401 connected to memory 1402, interface 1404, bus 1405 connected to processor 1401, memory 1402, and interface 1404, respectively, interface 1404 for receiving or transmitting data, processor 1401 being a single or multi-core central processing unit, either a specific integrated circuit, or one or more integrated circuits configured to implement an embodiment of the present invention. The memory 1402 may be a Random Access Memory (RAM), or may be a non-volatile memory (non-volatile memory), such as at least one hard disk memory. Memory 1402 is used to store computer-executable instructions. Specifically, program 1403 may be included in computer-executable instructions.

It should be understood that the processors mentioned in the network device and the terminal device in the above embodiments of the present application, or provided in the above embodiments of the present application, may be a Central Processing Unit (CPU), and may also be other general processors, digital Signal Processors (DSPs), application-specific integrated circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the number of the processors in the network device and the terminal device in the above embodiments in the present application may be one or multiple, and may be adjusted according to the actual application scenario, and this is merely an exemplary illustration and is not limited. The number of the memories in the embodiment of the present application may be one or multiple, and may be adjusted according to an actual application scenario, and this is merely an exemplary illustration and is not limited.

It should be further noted that, when the network device and the terminal device include a processor (or a processing unit) and a memory, the processor in this application may be integrated with the memory, or the processor and the memory are connected through an interface, and may be adjusted according to an actual application scenario, and is not limited.

The present application provides a chip system, which includes a processor for supporting a network device and a terminal device to implement the functions of the controller involved in the above method, such as processing data and/or information involved in the above method. In one possible design, the system-on-chip further includes a memory, the memory being used to hold the necessary program instructions and data. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In another possible design, when the chip system is a chip in a user equipment or an access network, the chip includes: a processing unit, which may be, for example, a processor, and a communication unit, which may be, for example, an input/output interface, a pin or a circuit, etc. The processing unit may execute computer-executable instructions stored by the storage unit to cause chips within the network device and the terminal device, etc. to perform the steps performed by the first network device and the terminal device in any of the embodiments of fig. 7 described above. Alternatively, the storage unit may be a storage unit in a chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in a network device, a terminal device, and the like, such as a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a Random Access Memory (RAM), and the like.

The embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method flows executed by the controllers of the network device and the terminal device in any of the above method embodiments. Correspondingly, the computer can be the network device and the terminal device.

It should be understood that the controller or processor mentioned in the above embodiments of the present application may be a Central Processing Unit (CPU), and may also be one or a combination of other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the number of the processors or controllers in the network device and the terminal device or the chip system in the above embodiments in the present application may be one or multiple, and may be adjusted according to the actual application scenario, and this is merely an exemplary illustration and is not limited. The number of the memories in the embodiment of the present application may be one or multiple, and may be adjusted according to an actual application scenario, and this is merely an exemplary illustration and is not limited.

It should also be understood that the memories or the readable storage media mentioned in the network devices and the terminal devices and the like in the above embodiments in the present application may be volatile memories or nonvolatile memories, or may include both volatile and nonvolatile memories. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), SLDRAM (synchronous DRAM), and direct rambus RAM (DR RAM).

Those skilled in the art will appreciate that the steps performed by the network device and the terminal device or the processor to implement all or part of the above embodiments may be performed by hardware or a program to instruct the associated hardware. The program may be stored in a computer readable storage medium, which may be read only memory, random access memory, etc. Specifically, for example: the processing unit or processor may be a central processing unit, a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. 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 present application.

When implemented in software, the method steps described in the above embodiments 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. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. 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, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wirelessly (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 available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., DVDs), or semiconductor media, among others.

The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and are merely descriptive of the manner in which objects of the same nature are distinguished in the embodiments of the application. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that in the description of the present application, unless otherwise indicated, "/" indicates a relationship where the objects associated before and after are an "or", e.g., a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural.

The word "if" or "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of data transmission, comprising:

the method comprises the steps that first network equipment sends a first correction signal to a target terminal, wherein the first correction signal is used for indicating the target terminal to feed back first channel quality information;

the first network equipment receives first channel quality information sent by the target terminal, wherein the first channel quality information is used for determining the channel quality of the first network equipment and the channel quality of the target terminal;

the first network device determines a first correction compensation coefficient according to the first channel quality information, wherein the first correction compensation coefficient is used for correcting a phase difference between the first network device and a second network device, and the target terminal is in a cell coverage range of the first network device and the second network device;

and the first network equipment sends first target data to the target terminal according to the first correction compensation coefficient.

2. The method of claim 1, further comprising:

the first network device receives second channel quality information sent by the second network device, wherein the second channel quality information is used for determining the channel quality of the second network device and the target terminal;

the first network device determining a first correction compensation coefficient according to the first channel quality information comprises:

and the first network equipment determines a first correction compensation coefficient according to the first channel quality information and the second channel quality information.

3. The method of claim 1 or 2, wherein the first network device sending a first correction signal to a target terminal comprises:

the first network device sends a plurality of first correction signals to the target terminal through N ports, wherein the ports are sending ports of the first network device.

4. The method of claim 3, wherein the first network device sending a plurality of first correction signals to the target terminal through N ports comprises:

the first network device sends a plurality of first correction signals to the target terminal through a first antenna and N ports, wherein the first antenna is an antenna of the first network device.

5. The method of claim 3 or 4, wherein the first network device sending a plurality of first correction signals to the target terminal via a first antenna and N ports comprises:

the first network equipment sends a plurality of first correction signals to the target terminal through a first antenna and N ports respectively at a plurality of phases;

the receiving, by the first network device, the first channel quality information sent by the target terminal includes:

the first network device receives a plurality of first channel quality information sent by the target terminal, and the plurality of first channel quality information respectively correspond to a plurality of first correction signals sent by a plurality of phases.

6. The method of claim 5, wherein the first channel quality information comprises a first Rank Indicator (RI), a first Channel Quality Indicator (CQI), and a first Precoding Matrix Indicator (PMI), and wherein the method further comprises:

the first network device obtains a plurality of first Spectral Effects (SE) according to the plurality of first RIs and the plurality of first CQIs, wherein the first SE represents a spectral effect corresponding to the first correction signal, and the plurality of first SE corresponds to a plurality of first correction signals sent by a plurality of phases;

the first network equipment determines a target spectral efficiency according to the first spectral efficiencies, wherein the target spectral efficiency is the largest of the values corresponding to the first spectral efficiencies;

and the first network equipment determines a first correction compensation coefficient according to the first PMI corresponding to the target spectral efficiency.

7. A method of data transmission, comprising:

the method comprises the steps that terminal equipment receives a first correction signal sent by first network equipment, wherein the first correction signal is used for indicating the terminal equipment to feed back first channel quality information;

the terminal device receives a second correction signal sent by a second network device, wherein the second correction signal is used for indicating the terminal device to feed back second channel quality information;

the terminal device sends first channel quality information to the first network device according to the first correction signal, wherein the first channel quality information is used for determining the channel quality of the first network device and the terminal device;

the terminal device sends second channel quality information to the second network device according to the second correction signal, wherein the second channel quality information is used for determining the channel quality of the second network device and the terminal device;

the terminal device receives first target data sent by the first network device, where the first target data is sent by the first network device according to a first correction compensation coefficient, the first correction compensation coefficient is determined by the first network device according to the first channel quality information, and the first correction compensation coefficient is used to correct a phase difference between the first network device and the second network device.

8. A network device, comprising:

a sending unit, configured to send a first correction signal to a target terminal, where the first correction signal is used to instruct the target terminal to feed back first channel quality information;

a receiving unit, configured to receive first channel quality information sent by the target terminal, where the first channel quality information is used to determine channel qualities of the first network device and the target terminal;

a determining unit, configured to determine a first correction compensation coefficient according to the first channel quality information, where the first correction compensation coefficient is used to correct a phase difference between the first network device and a second network device, and the target terminal is within a cell coverage range of the first network device and the second network device;

the sending unit is further configured to send first target data to the target terminal according to the first correction compensation coefficient.

9. The network device of claim 8, wherein the network device further comprises:

the receiving unit is further configured to receive second channel quality information sent by the second network device, where the second channel quality information is used to determine channel qualities of the second network device and the target terminal;

10. The network device according to claim 8 or 9, wherein the sending unit is specifically configured to send a plurality of first correction signals to the target terminal through N ports, where the ports are sending ports of the first network device.

11. The network device according to claim 10, wherein the sending unit is specifically configured to send a plurality of first correction signals to the target terminal through a first antenna and N ports, where the first antenna is an antenna of the first network device.

12. The network device according to claim 10 or 11, wherein the transmitting unit is specifically configured to transmit a plurality of first correction signals to the target terminal through a first antenna and N ports at a plurality of phases, respectively;

the receiving unit is specifically configured to receive a plurality of first channel quality information sent by the target terminal, where the plurality of first channel quality information correspond to a plurality of first correction signals sent by a plurality of phases, respectively.

13. The network device according to claim 12, wherein the first channel quality information includes a first rank indicator RI, a first channel quality indicator CQI, and a first precoding matrix indicator PMI, and wherein the determining unit is further configured to obtain a plurality of first spectral effects SE from the plurality of first RIs and the plurality of first CQIs, the first SE indicating a spectral effect corresponding to the first correction signal, and the plurality of first spectral effects SE corresponding to a plurality of phase-transmitted first correction signals;

the determining unit is further configured to determine a target spectral efficiency according to the plurality of first spectral efficiencies, where the target spectral efficiency is the largest among the plurality of values corresponding to the first spectral efficiencies;

14. A terminal device, comprising:

a receiving unit, configured to receive a first correction signal sent by a first network device, where the first correction signal is used to instruct the terminal device to feed back first channel quality information;

the receiving unit is further configured to receive a second correction signal sent by a second network device, where the second correction signal is used to instruct the terminal device to feed back second channel quality information;

15. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any of claims 1 to 7.

16. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 7.