WO2024041171A1

WO2024041171A1 - Phase calibration method and communication apparatus

Info

Publication number: WO2024041171A1
Application number: PCT/CN2023/102948
Authority: WO
Inventors: 余健; 许华
Original assignee: 华为技术有限公司
Priority date: 2022-08-24
Filing date: 2023-06-27
Publication date: 2024-02-29
Also published as: CN117640312A

Abstract

Embodiments of the present application provide a phase calibration method and a communication apparatus, capable of improving, when phase changes and/or frequency offset changes among a plurality of terminal devices are inconsistent, the coherence of a plurality of signals transmitted by aggregation, so as to improve the power gain of codirectional superposition of the plurality of signals. The method comprises: a first terminal device receives first indication information from a network device, receives, according to the first indication information, a first sounding reference signal (SRS) from a second terminal device on a time-frequency resource indicated by first SRS resource configuration information, and measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device. The first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and another terminal device, and the phase difference information and/or the frequency offset information are/is used for compensating for a corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send a first signal.

Description

Phase calibration method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 24, 2022, with application number 202211021005.3 and the application name "Phase Calibration Method and Communication Device", the entire content of which is incorporated into this application by reference. .

Technical field

The present application relates to the field of wireless communications, and in particular to a phase calibration method and communication device.

Background technique

In a wireless communication system, sending information from a terminal device to a network device is called uplink (UP) communication. Among them, in uplink communication, a single terminal device is limited in uplink transmit power, and the transmission rate is usually low, which cannot meet high-rate business requirements.

Currently, through cooperative transmission by multiple terminal devices, the data to be transmitted can be aggregated and transmitted by multi-channel signals corresponding to multiple terminal devices, so that the aggregated and transmitted multi-channel signals form a co-directional superposition when reaching the network device to obtain power gain. , thereby increasing the uplink transmission rate. However, in some scenarios, the aggregated and transmitted multi-channel signals cannot form a co-directional superposition when reaching the network device, which in turn results in the inability to obtain power gain.

Contents of the invention

The phase calibration method and communication device provided by the embodiments of the present application can improve the coherence of aggregated and transmitted multi-channel signals when the phase changes and/or frequency offset changes between multiple terminal devices are inconsistent, so as to improve the coherence superposition of multi-channel signals. Power gain.

In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

In a first aspect, a phase calibration method is provided. The method can be executed by a first terminal device, or can be executed by a component of the first terminal device, such as a processor, a chip, or a chip system of the first terminal device. It can also be It is implemented by a logic module or software that can realize all or part of the functions of the first terminal device. The following description takes the method being executed by the first terminal device as an example. The method includes: the first terminal device receives first indication information from the network device, and receives the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information; and The first SRS performs measurements to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. Wherein, the first indication information indicates that the first sounding reference signal SRS resource configuration information received by the first terminal equipment is used for phase calibration between the first terminal equipment and other terminal equipment, and the phase difference information and/or frequency offset information is used for compensation. The corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal. In this embodiment of the present application, the first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices, so that the first terminal device can receive data from the second terminal device. The first SRS of the terminal equipment, and measuring the first SRS to obtain the phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, through which the phase difference information and/or the frequency offset information can be Compensating for the phase difference caused by inconsistent phase changes and/or frequency offset changes between the first terminal device and the second terminal device when the first terminal device and the second terminal device transmit the first signal at the same time, thereby improving the performance of the first terminal device and the second terminal device to aggregate the coherence between the transmitted signals to improve the power gain of co-directional superposition of multi-channel signals. Therefore, based on the phase calibration method provided by the embodiments of the present application, when the phase changes and/or frequency offset changes among multiple terminal devices are inconsistent, the coherence of the aggregated and transmitted multi-channel signals can be improved to improve the co-directional superposition of the multi-channel signals. Power gain.

In conjunction with the above first aspect, in a possible implementation, the corresponding phase difference when the first terminal device and the second terminal device send the first signal includes a difference between the first phase difference and the second phase difference. The first phase difference is the phase difference between the first terminal device and the second terminal device at the first time, and the second phase difference is the phase difference between the first terminal device and the second terminal device at the second time. The first time is the channel state information CSI measurement time determined by the first terminal device. The second moment is the moment when the first terminal device sends the first signal to the network device.

In conjunction with the above first aspect, in a possible implementation manner, the corresponding frequency offset when the first terminal device and the second terminal device send the first signal includes a difference between the first frequency offset and the second frequency offset. The first frequency offset is the frequency offset between the first terminal device and the second terminal device at the first time, and the second frequency offset is the frequency offset between the first terminal device and the second terminal device at the second time. The first time is the CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device. time.

In conjunction with the above first aspect, in a possible implementation manner, the first indication information includes first SRS resource configuration information. Wherein, the first SRS resource configuration information includes usage indication, usage indicates that the first SRS resource configuration information is used by the first terminal device to receive SRS; or usage indicates that the first SRS resource configuration information is used by the first terminal device and other terminal devices. phase calibration. That is to say, the first indication information may be information in which usage is configured as "receive" in the first SRS resource configuration information. This may implicitly indicate that the first SRS resource configuration information is used between the first terminal device and other terminal devices. phase calibration. Moreover, since the SRS resource configuration information itself is used by the terminal device to send SRS, and when the SRS resource configuration information is used for phase calibration, it can be implicitly expressed that the SRS resource configuration information is used by the terminal device to receive SRS.

In conjunction with the above first aspect, in a possible implementation, the first indication information includes first SRS resource configuration information, and the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol. That is to say, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, it may indicate that the first SRS resource configuration information is used for receiving SRS. That is to say, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, it can indicate that the first SRS resource configuration information is used to receive SRS, and then implicitly indicates that the first SRS resource configuration information is used for receiving SRS. Phase calibration between the first terminal device and other terminal devices.

In conjunction with the above first aspect, in a possible implementation, when the first terminal device determines to use the non-codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is when the first terminal device receives The time of the channel state information reference signal CSI-RS from the network device.

In conjunction with the above first aspect, in a possible implementation, the method further includes: the first terminal device receiving second indication information from the network device, the second indication information being used to instruct the first terminal device to send a message to the second terminal device. The device sends a first precoding matrix, which is the precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal; the first terminal device receives the signal from the second terminal The first channel information of the device, the first channel information includes the channel matrix obtained by the second terminal device measuring the CSI-RS; the first terminal device obtains the first channel information and the first terminal device by measuring the CSI-RS. The two channel information determines the first precoding matrix; the first terminal device sends the first precoding matrix to the second terminal device. That is to say, by sending the first channel information to the first terminal device, the second terminal device can share the channel matrix of the downlink channel between the second terminal device and the network device between the first terminal device and the second terminal device. Furthermore, the first terminal device sends the first precoding matrix to the second terminal device, so that the first terminal device and the second terminal device can share the first precoding matrix.

Combined with the above first method, in a possible implementation, when the first terminal device determines to use the codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is when the first terminal device transmits the first signal to the network. The time when the device sends the second SRS, and the second SRS is used for CSI measurement of the uplink channel; or, the CSI measurement time determined by the first terminal device is the time when the second terminal device sends the third SRS to the network device. Wherein, the time when the second terminal device sends the third SRS to the network device is instructed by the network device to the first terminal device, and the third SRS is used for CSI measurement of the uplink channel.

In conjunction with the above first aspect, in a possible implementation, before the first terminal device receives the first indication information from the network device, the method further includes: the first terminal device receives third indication information from the network device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M. That is to say, the first terminal device can obtain multiple SRS resources for phase calibration between the first terminal device and other terminal devices according to the third indication information, and then the first terminal device can receive signals on multiple time-frequency resources. Multiple different SRSs are used for phase calibration, thereby improving the efficiency of phase calibration.

In conjunction with the above first aspect, in a possible implementation, before the first terminal device receives the first indication information from the network device, the method further includes: the first terminal device sends capability information to the network device, the capability information It is used to indicate that the first terminal device has the ability to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

In the second aspect, a phase calibration method is provided. The method can be executed by a network device, or by a component of the network device, such as a processor, a chip, or a chip system of the network device. It can also be executed by a device that can realize all or part of the Logic module or software implementation of network device functions. The following description takes the method being executed by a network device as an example. The method includes: the network device obtains first indication information and sends the first indication information to the first terminal device. Wherein, the first instruction information instructs the first terminal device to connect The received first sounding reference signal SRS resource configuration information is used for phase calibration between the first terminal equipment and other terminal equipment. In this embodiment of the present application, the first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices, so that the first terminal device can receive data from the second terminal device. The first SRS of the terminal equipment, and measuring the first SRS to obtain the phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, through which the phase difference information and/or the frequency offset information can be Compensating for the phase difference caused by inconsistent phase changes and/or frequency offset changes between the first terminal device and the second terminal device when the first terminal device and the second terminal device transmit the first signal at the same time, thereby improving the performance of the first terminal device and the second terminal device to aggregate the coherence between the transmitted signals to improve the power gain of co-directional superposition of multi-channel signals. Therefore, based on the phase calibration method provided by the embodiments of the present application, when the phase changes and/or frequency offset changes among multiple terminal devices are inconsistent, the coherence of the aggregated and transmitted multi-channel signals can be improved to improve the co-directional superposition of the multi-channel signals. Power gain.

Combined with the above second aspect, in a possible implementation manner, the first indication information includes first SRS resource configuration information. Wherein, the first SRS resource configuration information includes usage indication, usage indicates that the first SRS resource configuration information is used by the first terminal device to receive SRS; or usage indicates that the first SRS resource configuration information is used by the first terminal device and other terminal devices. phase calibration. That is to say, the first indication information may be information in which usage is configured as "receive" in the first SRS resource configuration information. This may implicitly indicate that the first SRS resource configuration information is used between the first terminal device and other terminal devices. phase calibration. Moreover, since the SRS resource configuration information itself is used by the terminal device to send SRS, and when the SRS resource configuration information is used for phase calibration, it can be implicitly expressed that the SRS resource configuration information is used by the terminal device to receive SRS.

In conjunction with the above second aspect, in a possible implementation manner, the first indication information includes first SRS resource configuration information, and the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol. That is to say, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, it may indicate that the first SRS resource configuration information is used for receiving SRS. That is to say, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, it can indicate that the first SRS resource configuration information is used to receive SRS, and then implicitly indicates that the first SRS resource configuration information is used for receiving SRS. Phase calibration between the first terminal device and other terminal devices.

In conjunction with the above second aspect, in a possible implementation, the method further includes: the network device sends second indication information to the first terminal device, and the second indication information is used to instruct the first terminal device to send The first precoding matrix is the precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal. The first moment is when the first terminal device receives data from the network. The time of the device's channel state information reference signal CSI-RS. That is to say, the network device may still be the first terminal device and send the first precoding matrix to the second terminal device, so that the first terminal device and the second terminal device can share the first precoding matrix.

In conjunction with the above second aspect, in a possible implementation manner, the network device obtains the first indication information, which may include: the network device receives capability information from the first terminal device, the capability information is used to indicate that the first terminal device has the ability to obtain The capability of phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

In conjunction with the above second aspect, in a possible implementation manner, the network device sends third indication information to the first terminal device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M. That is to say, the network device can provide the first terminal device with multiple SRS resources for phase calibration between the first terminal device and other terminal devices through the third indication information, so that the first terminal device can perform phase calibration at multiple times. Multiple different SRSs are received on frequency resources for phase calibration, thereby improving the efficiency of phase calibration.

In a third aspect, a communication device is provided for implementing the various methods mentioned above. The communication device may be the first terminal device in the first aspect, or a device including the first terminal device, or a device included in the first terminal device, such as a chip; or the communication device may be the second terminal device. The network device in the aspect, or the device including the above network device, or the device included in the above network device. The communication device includes corresponding modules, units, or means (means) for implementing the above method. The modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In some possible designs, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be called a transceiver unit, is used to implement the sending and/or receiving functions in any of the above aspects and any possible implementation manner thereof. The transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface. This processing module can be used to implement any of the above aspects and its processing functionality in any possible implementation.

Exemplarily, the transceiver module is configured to receive first indication information from the network device, where the first indication information is used to instruct the first terminal device to receive the first sounding reference signal SRS resource configuration information for the first terminal device to communicate with other devices. phase calibration between terminal devices; a transceiver module, further configured to receive the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information; a processing module, configured to An SRS performs measurements to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. The phase difference information and/or frequency offset information are used to compensate the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal.

Exemplarily, the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal include the difference between the first phase difference and the second phase difference, and the first phase difference is the first The phase difference between the terminal device and the second terminal device at the first time, and the second phase difference is the phase difference between the first terminal device and the second terminal device at the second time. The first time is the channel state information CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device.

Exemplarily, the corresponding frequency offset when the first terminal device and the second terminal device send the first signal includes the difference between the first frequency offset and the second frequency offset. The first frequency offset is the frequency offset between the first terminal device and the second terminal device at the first time, and the second frequency offset is the frequency offset between the first terminal device and the second terminal device at the second time. The first time is the CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device.

Exemplarily, the first indication information includes first SRS resource configuration information, and the first SRS resource configuration information includes usage indication. Wherein, usage indicates that the first SRS resource configuration information is used for the first terminal device to receive SRS; or usage indicates that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices.

Exemplarily, the first indication information includes first SRS resource configuration information, and the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol.

For example, when the first terminal device determines to use a non-codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is when the first terminal device receives the channel state information reference signal CSI- from the network device. RS moment.

Exemplarily, the transceiver module is also configured to receive second indication information from the network device. The second indication information is used to instruct the first terminal device to send the first precoding matrix to the second terminal device. The first precoding matrix Determine for the first terminal device the precoding matrix corresponding to the first moment when the first signal is sent using a non-codebook transmission method; the transceiver module is also used to receive the first channel information from the second terminal device, the first channel The information includes a channel matrix obtained by measuring the CSI-RS by the second terminal device; the processing module is also configured to determine the first precoding according to the first channel information and the second channel information obtained by measuring the CSI-RS by the first terminal device. Matrix; transceiver module, also used to send the first precoding matrix to the second terminal device.

For example, when the first terminal device determines to use the codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is the time when the first terminal device sends the second SRS to the network device, and the second SRS is sent by the first terminal device to the network device. The SRS is used for CSI measurement of the uplink channel; or, the CSI measurement time determined by the first terminal device is the time when the second terminal device sends the third SRS to the network device. Wherein, the time when the second terminal device sends the third SRS to the network device is instructed by the network device to the first terminal device, and the third SRS is used for CSI measurement of the uplink channel.

Exemplarily, the transceiver module is also configured to send capability information to the network device before receiving the first indication information from the network device. The capability information is used to indicate that the first terminal device is equipped to obtain the first terminal device and the second terminal device. capability between phase difference information and/or frequency offset information.

Exemplarily, the transceiver module is further configured to receive third indication information from the network device before receiving the first indication information from the network device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.

Optionally, the transceiver module described in the third aspect may include a receiving module and a sending module. This application does not specifically limit the specific implementation of the transceiver module.

Optionally, the communication device described in the third aspect may further include a storage module that stores programs or instructions. When the processing module executes the program or instruction, the communication device described in the third aspect can perform the method described in the first aspect.

In addition, the technical effects of the communication device described in the third aspect can be described with reference to any possible implementation manner in the first aspect. The technical effects of the communication method will not be repeated here.

A fourth aspect provides a communication device for performing the method in the above second aspect or any possible implementation of the second aspect. The communication device may be the network device in the above-mentioned second aspect, or a device including the above-mentioned network device, or a device included in the above-mentioned network device, such as a chip. The communication device includes corresponding modules, units, or means (means) for implementing the above method. The modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In conjunction with the above fourth aspect, in a possible implementation, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be called a transceiver unit, is used to implement the sending and/or receiving functions in the above second aspect and any possible implementation thereof. The transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface. This processing module can be used to implement the processing functions in the above second aspect and any possible implementation manner thereof.

Exemplarily, the processing module is configured to obtain first indication information, which indicates that the first sounding reference signal SRS resource configuration information received by the first terminal device is used for the phase between the first terminal device and other terminal devices. Calibration; transceiver module, configured to send first indication information to the first terminal device.

Exemplarily, the transceiver module is also configured to send second indication information to the first terminal device. The second indication information is used to instruct the first terminal device to send the first precoding matrix to the second terminal device. The first precoding matrix The matrix is a precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal. The first moment is when the first terminal device receives the channel state information reference signal CSI- from the network device. RS moment.

Exemplarily, the processing module is used to obtain the first indication information including: receiving capability information from the first terminal device through the transceiver module, and the capability information is used to indicate that the first terminal device is capable of obtaining the first terminal device and the second terminal device. phase difference information and/or frequency offset information; determine the first indication information based on the capability information.

Exemplarily, the transceiver module is further configured to send third indication information to the first terminal device before sending the first indication information to the first terminal device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.

Optionally, the transceiver module described in the fourth aspect may include a receiving module and a sending module. This application does not specifically limit the specific implementation of the transceiver module.

Optionally, the communication device described in the fourth aspect may further include a storage module that stores programs or instructions. When the processing module executes the program or instruction, the communication device described in the fourth aspect can perform the method described in the second aspect.

In addition, the technical effects of the communication device described in the fourth aspect can be referred to the technical effects of the communication method described in any possible implementation manner in the second aspect, which will not be described again here.

In some possible designs, the transceiver module includes a sending module and a receiving module, respectively used to implement the sending and receiving functions in any of the above aspects and any possible implementation manner thereof.

In a fifth aspect, a communication device is provided, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device performs the method described in any of the above aspects. The communication device may be the first terminal device in the first aspect, or a device including the first terminal device, or a device included in the first terminal device, such as a chip; or the communication device may be the second terminal device. The network device in the aspect, or the device including the above network device, or the device included in the above network device.

A sixth aspect provides a communication device, including: a processor and a communication interface; the communication interface is used to communicate with modules external to the communication device; the processor is used to execute computer programs or instructions to enable the communication device Perform any of the methods described above. The communication device may be the first terminal device in the first aspect, or a device including the first terminal device, or a device included in the first terminal device, such as a chip; or the communication device may be the second terminal device. in aspect Network equipment, or devices including the above network equipment, or devices included in the above network equipment.

In a seventh aspect, a communication device is provided, including: at least one processor; the processor is configured to execute a computer program or instructions stored in a memory, so that the communication device executes the method described in any of the above aspects. The memory may be coupled to the processor, or may be independent of the processor. The communication device may be the first terminal device in the first aspect, or a device including the first terminal device, or a device included in the first terminal device, such as a chip; or the communication device may be the second terminal device. The network device in the aspect, or the device including the above network device, or the device included in the above network device, such as a chip.

In an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer programs or instructions. When run on a communication device, the communication device can perform the method described in any of the above aspects. .

A ninth aspect provides a computer program product containing instructions that, when run on a communication device, enables the communication device to perform the method described in any of the above aspects.

A tenth aspect provides a communication device (for example, the communication device may be a chip or a chip system). The communication device includes a processor for implementing the functions involved in any of the above aspects.

In some possible designs, the communication device includes a memory for storing necessary program instructions and data.

In some possible designs, when the device is a system-on-a-chip, it may be composed of a chip or may include chips and other discrete components.

It can be understood that when the communication device provided in any one of the third to tenth aspects is a chip, the above-mentioned sending action/function can be understood as output, and the above-mentioned receiving action/function can be understood as input.

Among them, the technical effects brought by any one of the design methods in the third aspect to the tenth aspect can be referred to the technical effects brought by the different design methods in the above-mentioned first aspect or the second aspect, and will not be described again here.

An eleventh aspect provides a communication system, which includes the first terminal device described in the above aspect and the network device described in the above aspect.

Description of drawings

Figure 1 is a schematic diagram of a MIMO system channel model provided by an embodiment of the present application;

Figure 2 is a schematic flow chart of sending uplink signals based on codebook transmission provided by an embodiment of the present application;

Figure 3 is a schematic diagram of a non-codebook transmission process provided by an embodiment of the present application;

Figure 4 is a schematic diagram of a process for determining a precoding matrix provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of a communication system provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of a base station provided by an embodiment of the present application;

Figure 9 is a schematic flowchart 1 of a phase calibration method provided by an embodiment of the present application;

Figure 10 is a schematic diagram of the measurement time of aggregated transmission of a first terminal device and a second terminal device provided by an embodiment of the present application;

Figure 11 is a schematic flow chart 2 of a phase calibration method provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of a first terminal device provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of a network device provided by an embodiment of the present application.

Detailed ways

In order to facilitate understanding of the technical solutions provided by the embodiments of the present application, a brief introduction to the relevant technologies of the present application is first given. A brief introduction is as follows:

First, multiple input multiple output (MIMO) technology

MIMO technology refers to the technology that uses multiple antennas to send and receive signals in the field of wireless communications. Among them, network equipment and terminal equipment use MIMO technology to obtain power gain, spatial diversity gain, spatial multiplexing gain, etc. Spatial diversity can refer to introducing signal redundancy in space to achieve the purpose of diversity. For example, the terminal device transmits two data streams that are orthogonal to each other through two antennas, thereby obtaining diversity gain. Spatial multiplexing can refer to sending multiple independent data streams on the same time-frequency resource for each antenna to achieve the purpose of improving spectrum efficiency without increasing spectrum resources. For example, the terminal device can map the upstream data layer (layer mapper) into two independent data streams and pass them through multiple The antennas transmit simultaneously, so that airspace resources on the same time-frequency resource can be reused.

It can be understood that in the embodiment of the present application, the number of layers is equal to the number of independent data streams, which will be described uniformly here and will not be described again below.

Second, the antenna port (antenna port)

Antenna ports define the channel on a certain symbol. Among them, the antenna port is a logical concept. One antenna port can correspond to one transmitting antenna or multiple antennas. Antenna ports can be distinguished by reference signals (RS) (also called pilots): In the downlink (the link where the network device sends signals to the terminal device), the downlink and downlink reference signals are one by one. Correspondence; in the uplink, the uplink and the uplink reference signal correspond one to one. If a reference signal is transmitted through multiple antennas, then the multiple antennas correspond to the same antenna port; if two different reference signals pass through the same Antenna transmission, then the antenna corresponds to two independent antenna ports.

For example, the antenna port corresponding to the demodulation reference signal (de-modulation reference signal, DMRS) can be called a DMRS port, and the antenna port corresponding to the downlink channel state information reference signal (channel state information reference signal, CSI-RS) It can be called a CSI-RS port, and the antenna port corresponding to the uplink sounding reference signal (SRS) can be called an SRS port. Among them, CSI-RS is used for channel state information (CSI) measurement of downlink channels, and SRS is used for CSI measurement of uplink channels.

Optionally, in this embodiment of the present application, the channel experienced by the signal sent through the antenna port can be estimated through the reference signal corresponding to the antenna port. Among them, Table 1 exemplarily shows the corresponding relationship between some reference signals and antenna port index values in the new radio (new radio, NR) system. It can be understood that the antenna port index values in Table 1 are only exemplary and may also be other index values, which are not specifically limited in the embodiment of the present application.

Table I

See Table 1. In the NR system, PDSCH DMRS can support 12 antenna ports. Among them, the number of layers used by the network device to send PDSCH is the same as the number of ports of PDSCH DMRS. In other words, the network equipment supports the transmission of up to 12 PDSCH DMRS symbol streams.

Optionally, in this embodiment of the present application, PDSCH is mainly used for the transmission of downlink data, and may also be used for the transmission of system messages. For example, the system message may include CSI-RS resource configuration information and SRS resource configuration information. The CSI-RS resource configuration information is used by the terminal device to receive CSI-RS from the network device, and the SRS resource configuration information is used by the terminal device to send SRS to the network device.

Referring to Table 1 again, in the NR system, PDCCH DMRS can support 1 antenna port. Among them, PDCCH is used to transmit downlink control information (DCI). The DCI includes the scheduling information of the PDSCH received by the terminal equipment and the uplink scheduling permission information obtained by the network equipment measuring the SRS. Exemplarily, the uplink scheduling grant information may include PUSCH resource allocation, transmission precoding matrix indicator (transmission precoding matrix indicator, TPMI), transmission layer number, SRS resource indicator (SRS resource indicator, SRI), or DMRS port indication information wait.

Optionally, in this embodiment of the present application, TPMI is used by the terminal device to send uplink signals using a code book transmission method. in the transmission scheme. Among them, TPMI corresponds to a precoding matrix in the codebook set. SRI is used in transmission schemes where terminal equipment uses non-codebook transmission methods to send uplink signals. SRI can be associated to a non-quantized precoding matrix.

It should be understood that related concepts such as "codebook", "precoding matrix", "codebook transmission method", and "non-codebook transmission method" will be specifically explained in the following introduction of related terms, and will not be further introduced here.

Referring to Table 1 again, CSI-RS can support 32 antenna ports (including 1, 2, 4, 8, 12, 16, 24, and 32). For example, the network device sends CSI-RS to the terminal device. Accordingly, the terminal device receives the CSI-RS from the network device. The terminal device can perform channel estimation on the CSI-RS to obtain the CSI, and report the CSI to the network device through PUSCH or PUCCH.

Referring to Table 1 again, both PUSCH DMRS and SRS can support 4 antenna ports (including 1, 2, or 4). In other words, the terminal equipment can support the transmission of 4 independent SRS symbol streams or PUSCH DMRS symbol streams.

Fourth, channel matrix

Taking the MIMO system shown in Figure 1 as an example, as shown in Figure 1, the network equipment has Nt transmitting antennas, and the terminal equipment has Nr receiving antennas. Among them, the sending signal is X and the receiving signal is Y, then the relationship between the receiving signal Y and the sending signal
Y＝HX+N Formula (1)

Among them, X is a column vector containing Nt elements, Y is a column vector containing Nr elements, the channel matrix H is a matrix containing Nr×Nt elements, and N is additive Gaussian noise. For example, the channel matrix H may be the matrix shown in formula (2).

As shown in formula (2), h _ij in the i-th row and j-th column of the channel matrix H can represent the channel gain from the j-th transmitting antenna to the i-th receiving antenna.

Fifth, precoding matrix

In a wireless communication system, the transmitted signal can be preprocessed according to the channel information (eg, channel matrix H) obtained by CSI measurement. For example, part or all of the interference between multiple independent symbol streams after layer mapping can be eliminated in advance at the network device to achieve link adaptation of data transmission, that is, using different data transmission methods according to different channel conditions. Minimize interference between multi-layer spatial multiplexing stream symbol streams. The matrix used for precoding processing when network equipment or terminal equipment sends signals is the "precoding matrix". When the additive Gaussian noise N is ignored, after the network device adopts precoding processing, the relationship between the received signal Y and the transmitted signal X can be determined by formula (3).
Y＝HVX formula (3)

In formula (3), matrix V is a precoding matrix. It can be understood that in order to eliminate interference in the channel matrix H, V can be the inverse matrix H-1 of H. Since H and V are multiplied to form the identity matrix, that is, Y=HH ^-1 X=X, the interference of the channel can be offset.

It can be understood that multiplying the channel matrix H by V on the right is equivalent to multiplying the data corresponding to the transmitted signal X by V on the left. In other words, by precoding the data corresponding to the transmitted signal X, the channel matrix H can be precoded.

Optionally, in this embodiment of the present application, when the channel matrix H is irreversible, the precoding matrix V can be obtained by decomposing the channel matrix H and performing channel estimation. Among them, the method of decomposing the channel matrix H may be singular value decomposition (SVD), or eigen value decomposition (EVD), or other matrix decomposition methods. The embodiments of this application are No specific limitation is made.

The following takes SVD as an example to explain the process of obtaining the precoding matrix V through the channel matrix H.

5.1.SVD

In the embodiment of this application, formula (4) can be obtained by performing SVD decomposition on the channel matrix H.
H=USV ^H formula (4)

In formula (4), the matrix U is a unitary matrix of Nr×Nr elements, the matrix V ^H is a unitary matrix of Nt×Nt elements, and the matrix S is a diagonal matrix of Nr×Nt elements. The column vector of the matrix U is the orthogonal eigenvector of the product HHT of the channel matrix H and its transpose matrix HT. The column vectors of matrix V ^H are the orthogonal eigenvectors of HHT.

It should be understood that in the embodiment of the present application, the matrix S may not be a square matrix. For example, the matrix S may be a matrix shown in formula (5).

Optionally, in this embodiment of the present application, the number of elements whose values corresponding to the elements on the diagonal of the matrix S are greater than or equal to the first threshold is the rank of the channel matrix H. Wherein, the first threshold may be 0, 0.1, or 0.2, etc.; or, the first threshold may also be the condition number corresponding to the S matrix used to measure the sensitivity of the matrix to changes. This is not the case in the embodiment of this application. Specific limitations.

It should be understood that in the embodiment of the present application, the number of layers depends on the rank of the channel matrix H. For example, if the rank of the channel matrix H is 1, then the number of layers is 1; if the rank of the channel matrix H is 2, then the number of layers is 2. This is explained uniformly and will not be described again below.

5.2. Precoding

Since the product of the unitary matrix itself and its conjugate transposed matrix is the identity matrix, after the channel matrix H is right-multiplied by the precoding matrix V, formula (3) can be expressed as formula (6).
Y＝USV ^H VX＝USX Formula (6)

It can be understood that US in formula (6) indicates that the MIMO channel has not been completely decomposed into multiple independent channels, but the transmission process has been improved based on the actual channel. Among them, matrix V ^H is the conjugate transpose matrix of the precoding matrix. That is to say, by performing SVD decomposition on the signal matrix H, not only the rank of the channel matrix H can be obtained, but also the precoding matrix V can be obtained through V ^H.

Optionally, in this embodiment of the present application, the multiple symbol streams (symbol streams corresponding to the DMRS ports) obtained through layer mapping can be spread to each antenna port through precoding (ie, left multiplication of the precoding matrix). (such as CSI-RS port or SRS port). As an example, the number of antenna ports is 4, the number of layers is 2, and the number of symbols in each symbol stream is 1, and the description is given in combination with formula (7).

In formula (7), matrix L is a matrix corresponding to multiple symbol streams. Among them, the number of row vectors of matrix L is used to represent the number of layers. The number of row vectors (number of rows) of the precoding matrix V is equal to the number of antenna ports, and the number of column vectors (number of columns) of the precoding matrix V is equal to the number of layers (that is, the number of DMRS ports). The column vectors of the precoding matrix V are precoding vectors, and each precoding vector corresponds to a symbol stream. After the precoding matrix V is multiplied by the matrix L, each symbol stream (l ₁ or l ₂ ) is spread to each antenna port by the corresponding precoding vector (for example, the vector [v ₁₁ l ₁ ,v ₂₁ l ₁ ,v ₃₁ l ₁ ,v ₄₁ l ₁ ]T means that the symbol stream l ₁ is spread to each antenna port), and each antenna port carries the sum of multiple precoded symbol streams.

Optionally, in this embodiment of the present application, each element in the precoding vector may represent the weight of the symbol stream corresponding to the precoding vector sent by each antenna port. Among them, based on the weight of the symbol stream corresponding to the precoding vector sent by each antenna port represented by each element in the precoding vector, the signals sent by each antenna port are linearly superimposed, thereby forming a strong signal in a certain direction of space. area. That is, the precoding vector may indicate beam information for transmitting the symbol stream.

It should be understood that in the embodiments of this application, "precoding vector" may also be called "antenna weight vector", "angle vector", "digital beam (digital beam) vector", "spatial domain beam basis vector", or "spatial domain basis vector". vector" etc. In other words, "precoding vector", "antenna weight vector", "angle vector", "digital beam vector", "spatial domain beam basis vector", and "spatial domain basis vector" can be interchangeably expressed, and are explained here uniformly. No further details will be given below.

In this embodiment of the present application, a beam can be understood as a spatial resource, which can refer to a transmit or receive precoding vector with energy transmission directivity. Moreover, the sending or receiving precoding vector can be identified by index information, and the index information can correspond to the resource identifier (identity, ID) of the configured terminal device. For example, the index information can correspond to the identifier or resource of the configured CSI-RS; or it can It is the identifier or resource of the corresponding configured SRS. Optionally, the index information may also be index information carried explicitly or implicitly by a signal or channel carried by a beam. Energy transmission directivity can refer to precoding the signal to be sent through the precoding vector. The signal that has been processed by the precoding has a certain spatial directivity. The signal that has been precoded by the precoding vector has Better receiving power, such as meeting the reception demodulation signal-to-noise ratio; energy transmission directivity can also refer to receiving the same signal sent from different spatial locations through the precoding vector with different receiving powers. Optionally, the same communication device (such as terminal equipment or network equipment) may have different precoding vectors, and different devices may also have different precoding vectors, that is, Corresponds to different beams. Depending on the configuration or capabilities of the communication device, a communication device may use one or more of multiple different precoding vectors at the same time, that is, it may form one beam or multiple beams at the same time.

Sixth, codebook

A codebook is a set including multiple precoding matrices. The plurality of precoding matrices may be predefined. Codebooks can be divided into different types, such as Type I (type I) codebooks and Type II (type II) codebooks specified by the 3rd generation partnership project (3GPP) in technical specification (TS) 38.214 II) Codebook. Among them, Type I codebooks can be divided into Type I single-panel codebooks and Type II multi-panel codebooks. Type II codebooks can be divided into Type II single-panel codebooks and Type II multi-panel codebooks. The specific design of the codebooks and For implementation, please refer to the relevant description of TS38.214 and will not be repeated here.

Seventh, NR system uplink transmission scheme

Terminal equipment can transmit uplink signals through MIMO technology to obtain multi-antenna processing gains. The uplink transmission scheme of the NR system includes a transmission scheme that uses a codebook transmission method to send uplink signals, or a transmission scheme that uses a non-codebook transmission method to send uplink signals.

7.1. Codebook transmission

In the codebook-based transmission scheme, the precoding matrix used by the terminal equipment is taken from the fixed codebook. As shown in Figure 2, the process of the NR system sending uplink signals based on codebook transmission includes the following steps:

S201. The terminal device sends SRS to the network device. Accordingly, the network device receives the SRS from the terminal device.

S202. The network device measures the SRS from the terminal device to obtain the uplink scheduling permission information, and sends the uplink scheduling permission information to the terminal device. Correspondingly, the terminal device receives the uplink scheduling permission information from the network device. The uplink scheduling permission information may include information such as TPMI, transmission layer number, or SRI.

S203. The terminal device sends an uplink signal to the network device according to the uplink scheduling permission information. Correspondingly, the network device receives the uplink signal from the terminal device.

Optionally, the terminal device can determine the corresponding precoding matrix in the codebook based on TPMI, SRI, and the number of transmission layers, and then the terminal device can precode the uplink signal according to the precoding matrix.

As an example, the uplink scheduling permission information is explained by taking the network device configuring two SRS resources for the terminal device. Both SRS resources contain the same number of SRS ports. Among them, the network equipment selects the optimal uplink precoding matrix and the number of transmission layers by measuring the channels corresponding to the two SRS resources (for example, performing SVD decomposition on the SRS port), and converts the selected precoding matrix through the SRI in the DCI. The SRS resources corresponding to the matrix are indicated to the terminal equipment.

Optionally, in step S201, the terminal device may send SRS corresponding to multiple SRS resources using different beams (eg, analog beams). Correspondingly, the network device's selection of SRS resources (for example, the selected SRS resources indicated through SRI) is equivalent to the selection of the uplink transmission beam. It can be understood that when the network device configures an SRS resource for the terminal device, the precoding matrix selected by the network device corresponds to the SRS resource, and the uplink scheduling permission information sent by the network device to the terminal device in step 202 may not be Includes SRI.

Optionally, in this embodiment of the present application, the uplink signal may be carried by PUSCH. Among them, the DMRS of PUSCH and the data of PSUCH are precoded using the same precoding matrix. For example, the terminal equipment can precode the PUSCH data according to formula (8).

Referring to formula (8), [y ⁰ (i), y ¹ (i),..., y ^v-1 (i)]T represents the matrix corresponding to the symbols of the PUSCH data, and v represents the number of transmission layers indicated by the network device ( That is, the number of layers of PUSCH data), i represents the i-th data symbol of PUSCH data, and the precoding matrix V is the precoding matrix corresponding to TPMI. Among them, the precoding matrix V is multiplied by [y ⁰ (i), y ¹ (i),..., y ^v-1 (i)]T, which means precoding the PUSCH data. Indicates the data mapped to port p _n after precoding, n=0,1,...k-1.

It can be understood that the DMRS of PUSCH can also be precoded using the precoding method of formula (8), that is, the same precoding matrix is used for precoding, and the precoded DMRS symbol stream is mapped to the same antenna port. Among them, if the SRS sent by the terminal equipment itself is precoded (or simulated beamforming), the terminal equipment performs PUSCH and After the DMRS of PUSCH is precoded, it needs to be further processed according to the SRS precoding method.

7.2. Non-codebook transmission

The difference between the non-codebook transmission scheme and the codebook transmission scheme is that the precoding matrix of the non-codebook transmission scheme is no longer limited to a limited candidate set of fixed codebooks. Among them, the terminal equipment determines the uplink precoding matrix based on channel reciprocity (for example, the channel of a time division duplex (TDD) system has reciprocity). If reciprocity between uplink and downlink channels exists, the terminal device can estimate the uplink channel using downlink reference signals (such as CSI-RS), and use algorithms such as SVD on the estimated channel to obtain the uplink precoding matrix.

Taking the process of sending uplink signals based on codebook transmission in the NR system shown in Figure 2 as an example, the difference between the NR system sending uplink signals based on non-codebook transmission and sending uplink signals based on codebook transmission is:

(1) In step S201, the terminal device measures the CSI-RS from the network device to obtain an uplink precoding matrix, and the terminal device separately precodes the SRS according to multiple precoding vectors in the uplink precoding matrix. In other words, the terminal device sends the precoded SRS to the network device;

(2) In step S202, the uplink scheduling grant information does not include TPMI, and in step 203, the terminal device uses the precoding matrix corresponding to the SRI in the uplink scheduling grant information to determine the precoding matrix for transmitting the uplink signal.

For example, the non-codebook transmission process schematic diagram shown in FIG. 3 is used as an example to illustrate how the terminal device determines the precoding matrix for transmitting the signal. As shown in Figure 3, assuming that the uplink precoding matrix obtained by the terminal device according to CSI-RS includes four precoding vectors, and the network device configures four SRS resources for the terminal device, the terminal device can precode the four SRS resources respectively. sent later. Correspondingly, the network device receives the SRS sent from the terminal device. Among them, four SRS resources correspond to four precoding vectors one-to-one. For example, SRS resource #0 corresponds to precoding vector #0, SRS resource #1 corresponds to precoding vector #1, and SRS resource #2 corresponds to precoding vector #2. , and the precoding vector #3 corresponding to SRS resource #3. If the network device measures the SRS sent by the terminal device and selects SRS resource #0 and SRS resource #1, then the SRI in the uplink scheduling permission information sent by the network device indicates SRS resource #0 and SRS resource #1, and then the terminal device It may be determined according to the SRS indication that the precoding matrix for transmitting the uplink signal includes precoding vector #0 and precoding vector #1.

The following takes the NR system as an example to introduce the contents included in the SRS resource configuration information.

In the NR system, SRS resource set and SRS resources are introduced. The SRS resource configuration information may include one or more SRS resource sets, or one or more SRS resources. An SRS resource set may include one or more SRS resources. An SRS resource can include one or more of the following:

1. Usage indication (usage): In the NR system, the usage indication can be configured as "beam management (beammanagement)", "codebook (codebook)", "noncodebook (noncodebook)", or "antenna switching (antenna switching)" )"; among them, "beam management" is used for uplink beam management, "codebook" is used for uplink channel information acquisition of codebook transmission schemes, "non-codebook" is used for uplink channel information acquisition of non-codebook transmission schemes, " "Antenna switching" is used to obtain downlink channel information based on SRS antenna switching;

2. Number of antenna ports: In the NR system, one SRS resource can be configured with 1, 2 or 4 antenna ports;

3. Time domain position: In the NR system, the time domain position includes the index and starting position of the occupied orthogonal frequency division multiplexing (OFDM) symbol. Among them, the OFDM symbol index can indicate the number of OFDM symbols occupied by the SRS resource. One SRS resource can be configured with 1, 2, 4, 8 or 12 OFDM symbols, and the starting position can be given by the field startPosition;

4. Resource type: In the NR system, SRS resources can be divided into periodic (periodic), semi-persistent (semi-persistent) or aperiodic (aperiodic) types; among them, for semi-persistent or periodic SRS resource. An SRS resource can include the period and timeslot offset index (timeslot offset) specified for the terminal device;

5. Occupied resource block (resource element, RB) index: In the NR system, one SRS resource can occupy 4-272 RBs.

Eighth, multi-terminal equipment cooperative transmission

Multi-terminal device cooperative transmission is a communication technology that focuses on cooperative transmission of multiple terminal devices in a group of terminal devices. Among them, multi-terminal equipment cooperative transmission can be used to improve system throughput, expand coverage and increase capacity, and can also improve communication reliability and reduce communication delay. Multi-terminal device cooperative transmission can contribute to V2X and other scenarios as well as enhanced mobile broadband (eMBB) and ultra-reliable low latency communication (ultra-reliable low latency). communication, URLLC) and other scenarios.

Optionally, in this embodiment of the present application, multiple terminal devices in a group of terminal devices can communicate with each other through side link (SL) technology and/or short-range communication technology (such as Bluetooth, Wireless Fidelity (SL)). wireless fidelity (Wi-Fi), or near field communication (near field communication (NFC), etc.) to interact. Among them, the group of terminal devices can be divided into source user equipment (source user equipment, SUE), and other terminal devices can be called cooperative user equipment (cooperative user equipment, CUE). For example, the SUE can send the collaboration data to be sent and the sending time to one or more CUEs through the SL, and then the SUE and one or more CUEs can send the collaboration data at the same time, thereby realizing collaborative transmission.

It should be understood that in this embodiment of the present application, the cooperation data sent simultaneously by the SUE and the CUE may be the same; or, when the SUE and the CUE cooperate in transmission, they transmit the same transport block (TB). Among them, in NR, uplink transmission may be based on TB as the basic unit for data transmission, and the TB may refer to data before encoding, that is, the original data to be transmitted by each terminal device.

It can be understood that in the embodiments of the present application, "cooperative transmission", "aggregated transmission" and "joint transmission" have the same meaning and can be expressed interchangeably. They are explained in a unified manner and will not be described again below.

8.1. Coherent superposition

Coherent superposition can refer to the co-directional superposition of multiple signals, which increases the power of the signal received by the device, thereby obtaining power gain. Among them, strong coherence indicates that the signal power after the superposition of multiple signals is strong, and weak coherence indicates that the signal power after the superposition of multiple signals is weak.

8.1.1. Phase difference

The phase difference may refer to the phase difference between signals sent by the terminal device. In other words, the phase difference in the embodiment of the present application may refer to the phase difference between terminal devices. Among them, the phase difference can be used to indicate the strength of coherence. For example, taking terminal device #1 to send signal #1 and terminal device #2 to send signal #2, strong coherence means that the phase difference between signal #1 and signal #2 is near an integer multiple of 2π. For example, the phase difference between signal #1 and signal #2 minus an integer multiple of 2π is within a first range. The first range may be [-10°, 10°], [-20°, 20°], or (-40°, 40°), etc., the embodiments of the present application do not specifically limit this. It can be understood that the closer the phase difference between signal #1 and signal #2 is to an integer multiple of 2π, the stronger the coherence between signal #1 and signal #2. When it is an integer multiple of 2π, the coherence between signal #1 and signal #2 is the strongest, and the power gain obtained after signal #1 and signal #2 are superimposed in the same direction is the largest.

Correspondingly, weak coherence means that the phase difference between signal #1 and signal #2 is near an odd multiple of π, such as the phase difference between signal #1 and signal #2 minus an integer multiple of 2π. The value is outside the first range. It can be understood that the closer the phase difference between signal #1 and signal #2 is to an odd multiple of π, the weaker the coherence between signal #1 and signal #2. When it is an odd multiple of π, the coherence between signal #1 and signal #2 is the weakest, and signal #1 and signal #2 cancel each other after being superimposed in the same direction. Not only can no power gain be obtained, but also signal # The power reduction after superposition of 1 and signal #2.

8.1.2. Frequency deviation

Frequency offset can refer to the difference in frequency between signals sent by end devices. In other words, the frequency offset in the embodiment of the present application may refer to the frequency difference between terminal devices. Among them, frequency offset will cause a phase difference between the two signals, and this phase difference is the accumulation of frequency offset over time. That is to say, the phase difference between the two signals includes the phase difference caused by the frequency offset between the two signals.

It should be understood that in the embodiment of the present application, the phase difference between the terminal devices not only includes the phase difference caused by the frequency offset between the terminal devices, but also includes non-uniform phase differences due to other factors (such as random initial phase, channel delay, synchronization error, etc.) The phase difference caused by ideal factors). Among them, combined with the above related description of the precoding matrix, the precoding matrix can change the state of the signal (such as amplitude, frequency, or phase, etc.), so the phase difference and/or frequency offset between terminal devices can be compensated through the precoding matrix. . For example, if the precoding matrix compensates the phase difference between the terminal devices, it is equivalent to compensating the frequency offset between the terminal devices at the same time; if the precoding matrix only compensates for the phase difference caused by the frequency offset between the terminal devices , then the precoding matrix only compensates for the frequency offset between terminal devices, but does not compensate for the phase difference between terminal devices.

It can be understood that in the embodiment of the present application, the terminal equipment can compensate for the frequency offset by using a precoding matrix to compensate the phase difference caused by the frequency offset between the terminal equipment.

8.2. Power consistency

Power consistency may mean that the transmission power of the signal transmitted by the terminal device at different times remains the same or the variation of the transmission power is less than or equal to the first threshold. The first threshold may be 1dB, 2dB, or 3dB, which is not specifically limited in the embodiments of this application.

8.3. Phase continuity

Phase continuity may mean that the phase change amount of the signal sent by the terminal device at different times is less than or equal to the second threshold. The second threshold may be 10°, 20°, or 40°, which is not specifically limited in the embodiment of the present application.

Optionally, in this embodiment of the present application, the first threshold and the second threshold may be pre-configured by the terminal device; or the first threshold and the second threshold may be agreed upon by the agreement; or the first threshold and the second threshold may be It is indicated by the network device, and the embodiment of this application does not specifically limit this.

Optionally, in the embodiment of the present application, the aggregate transmission can be divided into non-coherent joint transmission according to whether the phase difference and/or frequency offset between signals sent by multiple terminal devices is compensated during the uplink transmission process. transmission, NCJT) and coherent joint transmission (coherent joint transmission, CJT). NCJT and CJT are introduced below.

8.4, NCJT

NCJT can mean that in aggregated transmission, the signal sent by each terminal device does not need to achieve the effect of coherent superposition (ie, co-directional superposition) when it reaches the network device. Among them, in NCJT, the network device determines the precoding matrix corresponding to each terminal device based on the CSI obtained from the CSI measurement of each terminal device. That is to say, in NCJT, the precoding matrix determined by the network device is determined based on the CSI information of the terminal device itself, without considering the CSI information of other terminal devices. Therefore, the precoding matrix determined by the network device does not compensate for the CSI information between terminal devices. phase difference.

For example, taking the aggregate transmission of two terminal devices (terminal device #1 and terminal device #2) shown in Figure 4 as an example to illustrate that the precoding matrix determined by NCJT does not compensate for the phase difference between the terminal devices. As shown in Figure 4, CSI measurement is performed between the network device and terminal device #1 to obtain the CSI of terminal device #1 at the CSI measurement time. Then the network device determines precoding matrix #1 based on the CSI and sends it to terminal device #1. 1 indicates the precoding matrix #1. Similarly, CSI measurement is performed between the network device and the terminal device #2 to obtain the precoding matrix #2 corresponding to the terminal device #2, and the precoding matrix #2 is indicated to the terminal device #2. Among them, for NCJT, since the precoding matrices are determined independently, there is no need to ensure that the phases between terminal equipment #1 and terminal equipment #2 are aligned, that is, precoding matrix #1 and precoding matrix #2 do not compensate the terminal Phase difference between device #1 and terminal device #2.

It should be understood that in the embodiment of the present application, in NCJT, the data before or after channel coding transmitted by each terminal device may be different; or, each terminal device transmits a different transmission block TB; or, each terminal device transmits a different transmission block TB; The same TB is transmitted, but the redundancy version (RV) transmitted by each terminal device can be different. Among them, in NR, TB includes basic data and multiple segments of redundant data after channel coding. The basic data and multiple segments of redundant data are stored in the cache area in sequence. RV is used to indicate the location of the terminal device to read the data in the cache area. That is, RV can be used to indicate the encoded data to be transmitted by each terminal device.

8.5,CJT

CJT can refer to the need for the signal sent by each terminal device to achieve coherent superposition (i.e., co-directional superposition) effect when it reaches the network device in aggregate transmission. Among them, in CJT, the network device jointly determines the precoding matrix corresponding to each terminal device based on the CSI obtained from the CSI measurement of each terminal device. That is to say, the precoding matrix determined in CJT is a precoding matrix determined comprehensively after combining the CSI information of each terminal device. Therefore, the precoding matrix determined in CJT compensates for the phase difference between multiple terminal devices.

Taking the aggregated transmission of two terminal devices (terminal device #1 and terminal device #2) as an example, it is illustrated that the precoding matrix determined by the CJT compensates for the phase difference between the terminal devices. Wherein, the network device may jointly determine the precoding matrix #3 of the terminal device #1 and the precoding matrix #4 of the terminal device #2 based on the channel matrix #1 of the terminal device #1 and the channel matrix #2 of the terminal device #2, and Indicate precoding matrix #3 to terminal device #1, and precoding matrix #4 to terminal device #2, thereby ensuring the coherence between the signal sent by terminal device #1 and the signal sent by terminal device #2 to improve The power gain of multi-channel signals superimposed in the same direction.

It should be understood that in the above example, channel matrix #1 is obtained by performing CSI measurements on the uplink channel between the network device and terminal device #1, and channel matrix #2 is obtained by performing CSI measurements on the uplink channel between the network device and terminal device #2. The channel is obtained by performing CSI measurements. Wherein, the CSI measurement time corresponding to channel matrix #1 is the same as the CSI measurement time corresponding to channel matrix #2 or the difference between them is less than the third threshold. The third threshold may be 0.2ms, 0.3ms, or 1ms, which is not specifically limited in the embodiment of the present application.

It can be understood that in the embodiment of the present application, CSI not only includes the channel matrix, but may also include interference information, etc. That is, the precoding matrix may be determined based on the channel matrix and/or interference information, which is not specifically limited in the embodiment of the present application.

Optionally, in the embodiment of this application, the third threshold may be pre-configured; or it may be agreed upon in the agreement. The examples do not specifically limit this.

Optionally, in this embodiment of the present application, in CJT, the data before channel coding transmitted by each terminal device may be the same; or the TB transmitted by each terminal device may be the same; or the RV of each terminal device may be the same. That is to say, in CJT, the collaboration data sent by each terminal device can be the same.

Currently, through CJT aggregation transmission, the signals sent by each terminal device in multiple terminal devices can be aggregated together for data transmission. When arriving at the network device, the aggregated and transmitted multi-channel signals form a co-directional superposition to obtain power gain. To achieve the effect of increasing the uplink transmission rate.

However, the phase and/or frequency offset of the terminal equipment itself changes at different times, even if the phase difference and/or frequency offset between the multi-channel signals at the CSI measurement time is compensated through the precoding matrix during the aggregate transmission of multiple terminal equipment. Frequency offset, but when the phase changes and/or frequency offset changes between multiple terminal devices are inconsistent, the phase difference and/or frequency offset between the multi-channel signals at the time of transmission cannot meet the coherence requirements of co-directional superposition, which will As a result, power gain cannot be obtained when multiple terminal devices aggregate transmission.

In view of this, embodiments of the present application provide a phase calibration method that can improve the coherence of aggregated and transmitted multi-channel signals when the phase changes and/or frequency offset changes between multiple terminal devices are inconsistent, so as to improve the co-directional superposition of multi-channel signals. power gain.

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. Among them, in the description of this application, unless otherwise stated, "/" means that the related objects are an "or" relationship. For example, A/B can mean A or B; "and/or" in this application "It is just an association relationship that describes related objects. It means that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A ,B can be singular or plural. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more than two. "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items). For example, at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple . In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as “first” and “second” are used to distinguish identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the number and execution order, and words such as "first" and "second" do not limit the number and execution order. At the same time, in the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "such as" in the embodiments of the present application is not to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete manner that is easier to understand.

In the embodiment of this application, "instruction" may include direct instruction and indirect instruction, and may also include explicit instruction and implicit instruction. The information indicated by certain information (such as the following first sounding reference signal SRS resource configuration information indicating that the first terminal equipment receives the SRS is used by the first terminal equipment to receive the SRS) is called information to be indicated. In the specific implementation process, it is treated as There are many ways to indicate information. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated, etc. The information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved by means of a pre-agreed (for example, protocol stipulated) arrangement order of each piece of information, thereby reducing the indication overhead to a certain extent.

The technical solutions of the embodiments of this application can be applied to various communication systems. For example: orthogonal frequency-division multiple access (OFDMA), single carrier frequency division multiple access (single carrier FDMA, SC-FDMA) and other systems. The term "system" is interchangeable with "network". The OFDMA system can implement wireless technologies such as evolved universal terrestrial radio access (E-UTRA) and ultra mobile broadband (UMB). E-UTRA is an evolved version of Universal Mobile Telecommunications System (UMTS). 3GPP's long term evolution (LTE) and various versions based on LTE evolution are new versions using E-UTRA. 5G communication system is the next generation communication system under research. Among them, the 5G communication system includes a non-standalone (NSA) 5G mobile communication system, a standalone (SA) 5G mobile communication system, or NSA's 5G mobile communication system and SA's 5G mobile communication system. In addition, the communication system can also be adapted to future-oriented communication technologies, all of which are applicable to the technical solutions provided by the embodiments of this application. The above-mentioned communication systems applicable to the present application are only examples. The communication systems applicable to the present application are not limited to these and will be explained uniformly here, and will not be described in detail below.

In addition, the communication architecture and business scenarios described in the embodiments of this application are to more clearly illustrate the technical aspects of the embodiments of this application. The technical solution does not constitute a limitation on the technical solution provided by the embodiment of the present application. Persons of ordinary skill in the art will know that with the evolution of communication architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present application is not suitable for similar technologies. question, the same applies.

As shown in Figure 5, a communication system is provided in this embodiment of the present application. The communication system includes one or more network devices 50 (Figure 5 takes the communication system including one network device 50 as an example), and each A plurality of terminal devices 60 are connected to the network device 50 . Among them, transmission among multiple terminal devices 60 can be aggregated.

In a possible implementation, the network device obtains the first indication information and sends the first indication information to the first terminal device. The first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for the first Phase calibration between end equipment and other end equipment. Correspondingly, the first terminal device receives the first indication information from the network device, receives the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and configures the first SRS for the first terminal device. An SRS performs measurements to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. The phase difference information and/or frequency offset information are used to compensate the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal.

The specific implementation of the above solution will be explained in detail in the following embodiments, and will not be described again here.

In this embodiment of the present application, the first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices, so that the first terminal device can receive data from the second terminal device. The first SRS of the terminal equipment, and measuring the first SRS to obtain the phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, through which the phase difference information and/or the frequency offset information can be Compensating for the phase difference caused by inconsistent phase changes and/or frequency offset changes between the first terminal device and the second terminal device when the first terminal device and the second terminal device transmit the first signal at the same time, thereby improving the performance of the first terminal device and the second terminal device to aggregate the coherence between the transmitted signals to improve the power gain of co-directional superposition of multi-channel signals. Therefore, based on the phase calibration method provided by the embodiments of the present application, when the phase changes and/or frequency offset changes among multiple terminal devices are inconsistent, the coherence of the aggregated and transmitted multi-channel signals can be improved to improve the co-directional superposition of the multi-channel signals. Power gain.

Optionally, the terminal device 60 in the embodiment of the present application may be a device used to implement wireless communication functions, such as a terminal or a chip that can be used in a terminal. Among them, the terminal can be a user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, in a 5G network or a future evolved public land mobile network (PLMN). Remote stations, remote terminals, mobile devices, wireless communication equipment, terminal agents or terminal devices, etc. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), or a device with wireless communications Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices or wearable devices, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial) Wireless terminals in control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc. Optionally, the terminal device can be mobile or fixed.

Optionally, the network device 50 in the embodiment of the present application may be a device that communicates with the terminal device 60 . The network device 50 may include a transmission and reception point (TRP), a base station, a remote radio unit (RRU) of a detached base station, or a baseband unit (BBU) (also known as a digital Unit (digital unit, DU)), broadband network service gateway (broadband network gateway, BNG), aggregation switch, non-3GPP access equipment, relay station or access point, etc. Among them, Figure 5 takes the network device as a base station as an example for illustration, which will be explained uniformly and will not be described again below. In addition, the base station in the embodiment of the present application may be a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (code division multiple access, CDMA) network. ), NB (NodeB) in wideband code division multiple access (WCDMA), eNB or eNodeB (evolutional NodeB) in LTE, and cloud radio access network (cloud radio access network, CRAN) scenarios The wireless controller or the base station in the 5G communication system, or the base station in the future evolution network, etc. are not specifically limited here.

Optionally, in this embodiment of the present application, both the network device 50 and the terminal device 60 may be configured with multiple antennas to support MIMO technology. Furthermore, the network device 50 and the terminal device 60 can support single-user MIMO (single-user MIMO, SU-MIMO) technology can also support multi-user MIMO (multi-user MIMO, MU-MIMO). Among them, MU-MIMO technology can be implemented based on space division multiple access (space division multiple access, SDMA) technology. Due to the configuration of multiple antennas, the network device 50 and the terminal device 60 can also flexibly support Single Input Single Output (SISO) technology, Single Input Multiple Output (SIMO) and Multiple Input Single Output (SIMO) technology. Multiple Input Single Output (MISO) technology to achieve various diversity (such as but not limited to transmit diversity and receive diversity) and multiplexing technologies, where the diversity technology may include but is not limited to transmit diversity (TD) technology and receive diversity (receive diversity, RD) technology, the multiplexing technology can be spatial multiplexing (spatial multiplexing) technology. Moreover, the various above-mentioned technologies may also include a variety of implementation solutions. For example, transmit diversity technologies may include but are not limited to: space-time transmit diversity (STTD), space-frequency transmit diversity (SFTD). , time switched transmit diversity (TSTD), frequency switch transmit diversity (FSTD), orthogonal transmit diversity (OTD), cyclic delay diversity (CDD), etc. Diversity methods, as well as diversity methods obtained through derivation, evolution and combination of the various diversity methods mentioned above. For example, the current LTE standard adopts transmit diversity methods such as space time block coding (STBC), space frequency block coding (space frequency block coding (SFBC)) and CDD. The above provides a general description of transmit diversity by way of example. Those skilled in the art should understand that, in addition to the above examples, transmit diversity also includes various other implementations. Therefore, the above introduction should not be understood as a limitation on the technical solutions provided by the embodiments of the present application, and the technical solutions provided by the embodiments of the present application should be understood as applicable to various possible transmit diversity solutions.

Optionally, the network device 50 and/or the terminal device 60 in the embodiment of the present application have the function of processing baseband signals, for example, in the downlink direction, they may have coding, rate matching, scrambling, One or more functions in modulation and layer mapping; in the uplink direction, it can have decoding, rate de-matching, de-scrambling, and de-modulation ), one or more functions in channel estimation/equalization.

Optionally, the network device 50 and/or the terminal device 60 in the embodiment of the present application have the processing function of processing intermediate frequency signals and/or radio frequency signals, and providing partial baseband signals. For example, they may have resource mapping (resource element) in the downlink direction. mapping), digital beam forming (DBF), inverse fast fourier transformation (IFFT) and cyclic prefix addition (cyclic prefix addition), analog beam forming (ABF) , one or more functions in analog to digital conversion; in the uplink direction, it can have fast fourier transformation (FFT) and cyclic prefix removal (cyclic prefix removal), analog beamforming , one or more functions in analog-to-digital conversion, digital beamforming, and resource element de-mapping.

Optionally, the network device 50 and the terminal device 60 in the embodiment of the present application can also be called a communication device, which can be a general device or a special device, which is not specifically limited in the embodiment of the present application.

Optionally, the relevant functions of the terminal device 50 or the network device 60 in the embodiment of the present application may be implemented by one device, may be implemented by multiple devices together, or may be implemented by one or more functional modules within one device. , the embodiments of this application do not specifically limit this. It can be understood that the above functions can be either network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or instantiated on a platform (for example, a cloud platform) Virtualization capabilities.

For example, the related functions of the terminal device 60 or the network device 50 in the embodiment of the present application can be implemented through the communication device 600 in FIG. 6 . FIG. 6 shows a schematic structural diagram of a communication device 600 provided by an embodiment of the present application. The communication device 600 includes one or more processors 601, communication lines 602, and at least one communication interface (FIG. 6 is only an example of including a communication interface 604 and a processor 601 for illustration). Optional may also include memory 603.

The processor 601 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors used to control the execution of the program of the present application. integrated circuit.

Communication line 602 may include a path for connecting between different components.

The communication interface 604 may be a transceiver module used to communicate with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (WLAN), etc. For example, the transceiver module may be a device such as a transceiver or a transceiver. Optionally, the communication interface 604 may also be a transceiver circuit located within the processor 601 to implement signal input and signal output of the processor.

The memory 603 may be a device with a storage function. For example, it can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM) or other types of things that can store information and instructions. Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage ( Including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer. any other medium, but not limited to this. The memory may exist independently and be connected to the processor through a communication line 602 . Memory can also be integrated with the processor.

Among them, the memory 603 is used to store computer execution instructions for executing the solution of the present application, and is controlled by the processor 601 for execution. The processor 601 is configured to execute computer execution instructions stored in the memory 603, thereby implementing the phase calibration method provided in the embodiment of the present application.

Alternatively, in the embodiment of the present application, the processor 601 may also perform functions related to the processing of the phase calibration method provided in the following embodiments of the present application, and the communication interface 604 is responsible for communicating with other devices or communication networks. In this embodiment of the present application, No specific limitation is made.

Optionally, the memory 603 in the embodiment of the present application can also be used to store information or parameters described in the following embodiments, such as first SRS resource configuration information, first indication information, codebook, and phase difference information. /or frequency offset information. The phase difference information and/or frequency offset information includes phase differences and/or frequency offsets between multiple terminal devices. For example, taking a plurality of terminal devices including a first terminal device and a second terminal device, the phase difference information and/or frequency offset information includes the phase difference and/or frequency between the first terminal device and the second terminal device. Partial. Taking multiple terminal devices including a first terminal device, a second terminal device, and a third terminal device as an example, the phase difference information includes the phase difference and/or frequency between the first terminal device, the second terminal device, and the third terminal device. Partial.

The computer-executed instructions in the embodiments of the present application may also be called application codes, which are not specifically limited in the embodiments of the present application.

In specific implementation, as an embodiment, the processor 601 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 6 .

In specific implementation, as an embodiment, the communication device 600 may include multiple processors, such as the processor 601 and the processor 608 in FIG. 6 . Each of these processors may be a single-CPU processor or a multi-CPU processor. A processor here may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).

In specific implementation, as an embodiment, the communication device 600 may also include an output device 605 and an input device 606. Output device 605 communicates with processor 601 and can display information in a variety of ways.

The above-mentioned communication device 600 may be a general-purpose device or a special-purpose device. For example, the communication device 600 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device with a similar structure as shown in FIG. 6 . The embodiment of the present application does not limit the type of communication device 600.

With reference to the schematic structural diagram of the communication device 600 shown in FIG. 6 , taking the communication device 600 as the terminal device 60 in FIG. 5 as an example, FIG. 7 illustrates a specific structural form of the terminal device 60 provided by the embodiment of the present application. .

In some embodiments, the functions of the processor 601 in Figure 6 can be implemented by the processor 710 in Figure 7 .

In some embodiments, the function of communication interface 604 in Figure 6 can be implemented through antenna 1, antenna 2, mobile communication module 750, wireless communication module 760, etc. in Figure 7.

Among them, antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in terminal device 60 may be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example: Antenna 1 can be reused as a diversity antenna for a wireless LAN. In other embodiments, antennas may be used in conjunction with tuning switches.

The mobile communication module 750 can provide wireless communication solutions including 2G/3G/4G/5G applied on the terminal device 60 . The mobile communication module 750 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 750 can receive electromagnetic waves from the antenna 1, perform filtering, amplification and other processing on the received electromagnetic waves, and transmit them to the modem processor for demodulation. The mobile communication module 750 can also amplify the signal modulated by the modem processor and convert it into electromagnetic waves through the antenna 1 for radiation. In some embodiments, at least part of mobile communications module 750 Sub-functional modules may be provided in the processor 710. In some embodiments, at least part of the functional modules of the mobile communication module 750 and at least part of the modules of the processor 710 may be provided in the same device.

The wireless communication module 760 may be one or more devices integrating at least one communication processing module. The wireless communication module 760 receives electromagnetic waves via the antenna 2 , frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 710 . The wireless communication module 760 can also receive the signal to be sent from the processor 710, frequency modulate it, amplify it, and convert it into electromagnetic waves through the antenna 2 for radiation.

In some embodiments, the antenna 1 of the terminal device 60 is coupled to the mobile communication module 750, and the antenna 2 is coupled to the wireless communication module 760, so that the terminal device 60 can communicate with the network and other devices through wireless communication technology.

In some embodiments, the function of the memory 603 in Figure 6 can be implemented through the internal memory 721 in Figure 7 or an external memory (such as a Micro SD card) connected to the external memory interface 720.

In some embodiments, the functions of the output device 605 in FIG. 6 may be implemented through the display screen 794 in FIG. 7 . Display 794 includes a display panel.

In some embodiments, the functionality of input device 606 in FIG. 6 may be implemented through a mouse, keyboard, touch screen device, or sensor module 780 in FIG. 7 . In some embodiments, as shown in Figure 7, the terminal device 60 may also include an audio module 770, a camera 793, an indicator 792, a motor 791, a button 790, a SIM card interface 795, a USB interface 730, a charging management module 740, One or more of the power management module 741 and the battery 742 are not specifically limited in this embodiment of the present application.

It can be understood that the structure shown in FIG. 7 does not constitute a specific limitation on the terminal device 60. For example, in other embodiments of the present application, the terminal device 60 may include more or less components than shown in the figures, or combine some components, or split some components, or arrange different components. The components illustrated may be implemented in hardware, software, or a combination of software and hardware.

Or, with reference to the schematic structural diagram of the communication device 600 shown in Figure 6, take the communication device 600 as the network device 50 in Figure 5 and the network device 50 as a base station as an example. Exemplarily, Figure 8 shows the base station provided by the embodiment of the present application. A specific structural form of 80.

The base station 80 includes one or more radio frequency units (such as RRU801) and one or more BBU802.

The RRU 801 may be called a transceiver unit, a transceiver, a transceiver circuit, a transceiver, etc., and may include at least one antenna system (ie, antenna) 811 and a radio frequency unit 812. The RRU801 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals. In some embodiments, the function of the communication interface 604 in Figure 6 can be implemented through the RRU 801 in Figure 8 .

The BBU802 is the control center of network equipment and can also be called a processing unit. It is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc.

In some embodiments, the BBU 802 may be composed of one or more single boards. Multiple single boards may jointly support a wireless access network (such as an LTE network) with a single access indication, or may respectively support wireless access networks of different access standards. Access network (such as LTE network, 5G network or other networks). The BBU 802 also includes a memory 821 and a processor 822. The memory 821 is used to store necessary instructions and data. The processor 822 is used to control the network device to perform necessary actions. The memory 821 and processor 822 may serve one or more single boards. In other words, the memory and processor can be set independently on each board. It is also possible for multiple boards to share the same memory and processor. In addition, necessary circuits can also be installed on each board. In some embodiments, the function of the processor 601 in Figure 6 can be implemented by the processor 822 in Figure 8 , and the function of the memory 603 in Figure 6 can be implemented by the memory 821 in Figure 8 .

Optionally, the RRU 801 and the BBU 802 in Figure 8 may be physically installed together or physically separated, for example, a distributed base station, which is not specifically limited in this embodiment of the present application.

Optionally, the network device 50 in the embodiment of the present application may support one or more of the following: spatial multiplexing, SU-MIMO, coding, rate matching, scrambling, modulation, layer mapping, precoding, resource mapping, IFFT , DBF, or ABF and other functions.

Optionally, the terminal device 60 in this application may support one or more of the following functions: decoding, rate dematching, descrambling, demodulation, or channel estimation/equalization.

The phase calibration method provided by the embodiment of the present application will be described below with reference to FIG. 9 .

It should be understood that the names of the signals between the various devices or the names of the parameters in the signals in the following embodiments of the present application are just examples, and other names may also be used in specific implementations, which are not specifically limited in the embodiments of the present application.

Taking the network device 50 shown in Figure 5 interacting with the first terminal device and the second terminal device respectively as an example, as shown in Figure 9, a phase calibration method provided by an embodiment of the present application includes the following steps:

S901. The network device obtains the first instruction information. Wherein, the first indication information indicates the first SRS received by the first terminal device The resource configuration information is used for phase calibration between the first terminal device and other terminal devices. The phase calibration between the first terminal device and other terminal devices may refer to: in the case of coherent aggregation transmission between the first terminal device and other terminal devices, the first terminal device compensates the first terminal device for transmitting signals simultaneously with other terminal devices. corresponding phase difference and/or frequency offset.

As an example, the first terminal device and the second terminal device perform aggregated transmission, and the second terminal device is another terminal device. The phase calibration between the first terminal device and the second terminal device may refer to the first terminal device compensating the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send signals simultaneously. It can be understood that the aggregation transmission between the first terminal device and the second terminal device may be aggregation transmission between the first terminal device and the second terminal device using CJT. For details, please refer to the introduction about CJT in the preamble of the specific embodiments, here. No longer.

Optionally, in the implementation of this application, the network device obtains the first indication information (step S901), which may include: the first terminal device sends capability information to the network device, and the capability information is used to indicate that the first terminal device is capable of obtaining the first terminal device. The ability to provide phase difference information and/or frequency offset information between the device and other end devices. Correspondingly, the network device receives the capability information from the first terminal device, and determines the first indication information based on the capability information. That is to say, if the first terminal device has the ability to obtain phase difference information and/or frequency offset information between the first terminal device and other terminal devices, the network device determines the first indication information based on the capability information of the first terminal device. ; If the first terminal device does not have the ability to obtain the phase difference information and/or frequency offset information between the first terminal device and other terminal devices, the network device gives up obtaining the first indication information. In this way, the network device can determine whether to send the first indication information to the first terminal device according to the capability information of the first terminal device, so as to avoid invalid signaling interactions caused by sending the first indication information that exceeds its capabilities to the first terminal device. , thereby improving the efficiency of phase calibration.

Optionally, in this embodiment of the present application, the capability information may be carried in the signaling of radio resource control (RRC) capability reporting. Among them, information elements for phase calibration capabilities can be added to the signaling reported by the RRC capability.

Or, optionally, the capability information may be information on aggregated coherent transmission capabilities of the terminal devices. That is to say, when the first terminal device sends a message to the network device that the terminal device has the ability to aggregate coherent transmission, by default the first terminal device has the ability to obtain the phase difference information and/or frequency between the first terminal device and the second terminal device. The ability to bias information.

Or, alternatively, the capability information may be coherence time window size information. The coherence time window may indicate that the terminal device can ensure power consistency and/or phase continuity within the time window, thereby enabling aggregated coherent transmission. That is to say, when the first terminal device sends information about the coherence time window size to the network device, by default the first terminal device has the ability to obtain the phase difference information and/or frequency offset between the first terminal device and the second terminal device. information capabilities.

Or, optionally, in this embodiment of the present application, the network device may obtain the first indication information when it is determined that the first terminal device and the second terminal device perform aggregated transmission. That is to say, when the first terminal device performs aggregate transmission, the protocol stipulates that the first terminal device has the ability to obtain the phase difference information and/or frequency offset information between the first terminal device and other terminal devices, and then the network The device can determine the first indication information without the need for the first terminal device to send capability information.

Or, optionally, the network device may obtain the first indication information when it is determined that the first terminal device and the second terminal device perform coherent aggregation. Among them, coherent aggregated transmission may refer to CJT. That is to say, when the first terminal device performs CJT, the protocol stipulates that the first terminal device has the ability to specifically obtain the phase difference information and/or frequency offset information between the first terminal device and other terminal devices, and then the network device The first indication information can be determined without the first terminal device sending capability information.

S902. The network device sends the first instruction information to the first terminal device. Correspondingly, the first terminal device receives the first indication information from the network device.

Optionally, in this embodiment of the present application, the first indication information may include first SRS resource configuration information, which is used to instruct the first terminal device to receive SRS; or, the first SRS resource configuration information is used. To indicate phase calibration between the first terminal device and other terminal devices.

It should be understood that in this embodiment of the present application, when the first terminal device and the second terminal device perform aggregated transmission, after the first terminal device receives the first SRS resource configuration information for receiving SRS, it can configure the configuration information according to the first SRS resource. The configuration information receives the first SRS from the second terminal device, and measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device. That is to say, in this embodiment of the present application, the first SRS resource configuration information used by the first terminal device to receive SRS may implicitly indicate that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices. .

Optionally, in a possible implementation, the first SRS resource configuration information includes usage, where the usage indicates that the first SRS resource configuration information is used by the first terminal device to receive SRS. Among them, the usage can be a new usage in the SRS resource configuration information. type. For example, when usage in the first SRS resource configuration information is configured as "send", the first SRS resource configuration information is used to send SRS. In the case where usage in the first SRS resource configuration information is configured as "receive", the first SRS resource configuration information is used to receive SRS. That is to say, the first indication information may be information in which usage is configured as "receive" in the first SRS resource configuration information. This may implicitly indicate that the first SRS resource configuration information is used between the first terminal device and other terminal devices. phase calibration.

Or, optionally, the usage indicates that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices. That is to say, since the SRS resource configuration information itself is used by the terminal device to send SRS, and when the SRS resource configuration information is used for phase calibration, it can implicitly indicate that the SRS resource configuration information is used by the terminal device to receive SRS.

In another possible implementation manner, the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol. Since an OFDM symbol may include three types: downlink symbols, uplink symbols and flexible symbols, uplink symbols can only be used for uplink transmission, and downlink symbols can only be used for downlink transmission. That is to say, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, it can indicate that the first SRS resource configuration information is used to receive SRS, and then implicitly indicates that the first SRS resource configuration information is used for receiving SRS. Phase calibration between the first terminal device and other terminal devices.

Optionally, the network device may send the first SRS resource configuration information to the first terminal device through a system message or RRC signaling. Correspondingly, the first terminal device may receive the first SRS resource configuration information from the network device through a system message or RRC signaling.

Or, optionally, in this embodiment of the present application, the first indication information may be used to activate the first terminal device to receive SRS on the time-frequency resource indicated by the first SRS resource configuration information. Exemplarily, the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information may be a flexible symbol, and the first indication information may indicate that the flexible symbol is a downlink symbol, thereby activating the first terminal device to use the first SRS resource. Receive SRS on the time-frequency resource indicated by the configuration information.

It should be understood that the first indication information instructs the first terminal device to receive SRS on the time-frequency resource indicated by the first SRS resource configuration information, and may implicitly indicate that the first SRS resource configuration information is used between the first terminal device and other terminal devices. phase calibration.

Optionally, in this embodiment of the present application, the signaling carrying the first indication information may include first RRC signaling, or first media access control (media access control, MAC) layer signaling, or first DCI signaling, The embodiments of the present application do not specifically limit this.

It can be understood that the first RRC signaling, the first MAC layer signaling, or the first DCI signaling may not include the first SRS resource configuration information.

Optionally, in this embodiment of the present application, the first indication information and the first SRS resource configuration information may be transmitted separately.

Optionally, in the embodiment of the present application, the first indication information can be sent together as a whole, or can be divided into multiple sub-information and sent separately, and the sending period and/or sending timing of these sub-information can be the same or different. The specific sending method is not limited in this application. The sending period and/or sending timing of these sub-information may be predefined, for example, based on a protocol, or may be configured by the network device by sending configuration information to the terminal device.

Optionally, in the embodiment of the present application, the first indication information may be sent through one message or through multiple messages, which is not limited in the embodiment of the present application.

It should be understood that in the embodiment of the present application, among the three types of signaling involved in sending the first indication information: physical layer signaling is also called first layer (layer1, L1) signaling, which can usually be represented by the physical layer The control part of the frame is carried. A typical example of L1 signaling is the DCI carried in the PDCCH defined in the LTE standard. In some cases, L1 signaling may also be carried by the data portion of the physical layer frame. It is not difficult to see that the sending cycle or signaling cycle of L1 signaling is usually the cycle of the physical layer frame. Therefore, this signaling is usually used to implement some dynamic control to transmit some frequently changing information. For example, it can be transmitted through the physical layer. The signaling transmits the first signaling in the embodiment of this application. MAC layer signaling belongs to layer 2 (layer 2, L2) signaling, which can usually be carried by, for example but not limited to, a frame header of a layer 2 frame. The above frame header may also carry information such as, but not limited to, source address and destination address. In addition to the frame header, layer 2 frames usually contain a frame body. In some cases, L2 signaling may also be carried by the frame body of the Layer 2 frame. Typical examples of second-layer signaling are the signaling carried in the frame control (frame control) field in the frame header of the MAC frame in the 802.11 series of standards, or the MAC control entity (MAC-CE) defined in some communication protocols. ). Layer 2 frames can usually carry the data portion of the physical layer frame. RRC signaling belongs to the third layer (layer 3) signaling, which is usually some control messages. L3 signaling can usually be carried in the frame body of the second layer frame. This paragraph only describes the principle description of physical layer signaling, MAC layer signaling, RRC signaling, layer 1 signaling, layer 2 signaling and layer 3 signaling. The specific details of the three signaling can be With reference to existing technology, I won’t go into details here.

It can be understood that in this embodiment of the present application, the first SRS resource configuration information includes the time-frequency domain location of the SRS. The time-frequency domain location of the SRS may be the time-frequency domain location of the SRS sent by other terminal devices to the network device. For example, taking the first terminal device and the second terminal device performing aggregate transmission as an example, the time-frequency domain location of the SRS in the first SRS resource configuration information may be the location of the first SRS sent by the second terminal device to the network device. time-frequency domain position. That is to say, the first terminal device can determine the time-frequency domain position of the first SRS sent by the second terminal device to the network device according to the time-frequency domain position of the SRS in the first SRS resource configuration information.

Optionally, in this embodiment of the present application, the network device may send the SRS resource configuration information about the first SRS to the second terminal device through a system message or RRC signaling. Correspondingly, the second terminal device may receive SRS resource configuration information about the first SRS from the network device through a system message or RRC signaling. The SRS resource configuration information about the first SRS may include one or more SRS resource sets. An SRS resource set may include one or more SRS resources. One or more SRS resources are used by the second terminal device to send one or more SRS. The one or more SRSs may include a first SRS. The second terminal device may send the first SRS according to the SRS resource configuration information about the first SRS from the network device.

Optionally, in this embodiment of the present application, the network device may send the SRS resource configuration information about the first SRS to the second terminal device before or after sending the first indication information to the first terminal device (step S902). This application implements The example does not specifically limit this.

S903. The second terminal device sends the first SRS. Correspondingly, the first terminal device receives the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information.

It can be understood that in this embodiment of the present application, the second terminal device may also send the first SRS to the network device. Correspondingly, the network device receives the first SRS from the second terminal device. The network device may perform CSI measurement based on the first SRS to obtain the CSI corresponding to the moment when the second terminal device sends the first SRS.

S904. The first terminal device measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device. The phase difference information and/or frequency offset information are used to compensate the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal.

It should be understood that the first signal is a signal used to simultaneously send cooperation data when the first terminal device and the second terminal device perform coherent aggregation transmission. Wherein, the data or TB carried by the first signal sent by the first terminal device may be the same as the data or TB carried by the first signal sent by the second terminal device. For details, please refer to "Eighth, Multi-Terminal Devices" in the preamble of the detailed description. The relevant descriptions in "Cooperative Transmission" will not be repeated here.

Optionally, in this embodiment of the present application, the first terminal device may send collaboration data to the second terminal device. Correspondingly, the second terminal device receives the collaboration data from the first terminal device. The first terminal device may be called SUE, and the second terminal device may be called CUE.

Or, optionally, the second terminal device sends collaboration data to the first terminal device. Correspondingly, the first terminal device receives collaboration data from the second terminal device. Wherein, the first terminal device may be called CUE, and the second terminal device may be called SUE.

The coherent aggregation transmission method in the embodiment of the present application is introduced below.

It should be understood that based on the introduction about CJT in the preamble of the detailed description, in the embodiments of the present application, coherent aggregation transmission can be divided into two methods according to whether the precoding matrix at the CSI measurement time compensates for the phase difference and/or frequency offset. Before introducing the two coherent aggregation transmission methods in the embodiments of the present application, the "first moment" and the "second moment" involved in coherent aggregation transmission are first introduced.

Optionally, in this embodiment of the present application, the first time is the CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device. The CSI measurement time may refer to the time when the reference signal for CSI measurement is sent. The reference signal may be an SRS used for uplink channel measurement in a codebook transmission mode, or may be a CSI-RS used for downlink channel measurement in a non-codebook transmission mode.

Optionally, in this embodiment of the present application, the first terminal device may determine according to the usage in the SRS resource configuration information to use the codebook transmission method to send the first signal, or to use the non-codebook transmission method to send the first signal. For example, refer to the usage description of SRS resources in the preamble of the specific embodiments. When the usage in the SRS configuration information is configured as "codebook", the SRS resource configuration is used to obtain the uplink channel information of the codebook transmission scheme. ; When the usage in the SRS resource configuration information is configured as "non-codebook", the SRS resource configuration information is used to obtain uplink channel information for the non-codebook transmission scheme; or, A terminal device may also determine whether to use the codebook transmission mode to send the first signal through the high-level parameter txconfig, which is not specifically limited in the embodiment of the present application.

Optionally, in this embodiment of the present application, coherent aggregation transmission can be performed in the following two ways.

Coherent aggregation transmission method 1: The precoding matrix determined at the first moment has compensated for the phase difference and/or frequency offset between the first terminal device and the second terminal device at the first moment (for example, the precoding matrix determined jointly in CJT matrix), compensate the phase difference and/or frequency offset between the first terminal device and the second terminal device between the second time and the first time.

Optionally, in this embodiment of the present application, the corresponding phase difference when the first terminal device and the second terminal device send the first signal includes the difference between the first phase difference and the second phase difference. The first phase difference is the phase difference between the first terminal device and the second terminal device at the first time, and the second phase difference is the phase difference between the first terminal device and the second terminal device at the second time. That is to say, the first terminal device uses the phase difference information and/or the frequency offset information to compensate the difference between the first phase difference and the second phase difference when the first terminal device sends the first signal.

It can be understood that in coherent aggregation transmission mode 1, the first terminal device has compensated for the first phase difference when sending the first signal using the precoding matrix determined at the first moment. However, between the first terminal device and the second terminal device When the phase changes are inconsistent, the second phase difference is different from the first phase difference, and the first terminal device needs to compensate the difference between the first phase difference and the second phase difference according to the phase difference information and/or the frequency offset information. For example, assume that the first phase difference is 10° at the first moment and the second phase difference is 30° at the second moment. Since the precoding matrix determined at the first moment has compensated for the phase difference of 10°, therefore The first terminal equipment also needs to compensate for the phase difference of 20°.

Optionally, in this embodiment of the present application, the corresponding frequency offset when the first terminal device and the second terminal device send the first signal includes a difference between the first frequency offset and the second frequency offset. The first frequency offset is the frequency offset between the first terminal device and the second terminal device at the first time, and the second frequency offset is the frequency offset between the first terminal device and the second terminal device at the second time. It can be understood that when the first terminal device sends the first signal using the precoding matrix determined at the first moment, the first phase difference has been compensated, that is, the phase difference caused by the first frequency offset has been compensated. However, when the frequency offset changes between the first terminal device and the second terminal device are inconsistent, the second frequency offset is different from the first frequency offset, and the first terminal device needs to compensate the first frequency offset and the second frequency offset according to the frequency offset information. The difference between deviations. For example, assume that the phase difference caused by the first frequency offset is 10° at the first moment, and the phase difference caused by the second frequency offset at the second moment is 30°. Since the precoding matrix determined at the first moment has To compensate for the phase difference of 10°, the first terminal device also needs to compensate for the phase difference of 20°.

Coherent aggregation transmission method 2: When the precoding matrix determined at the first moment does not compensate for the phase difference and/or frequency offset between the first terminal device and the second terminal device at the first moment, compensate the first terminal device and the second terminal device. The phase difference and/or frequency offset between the second terminal devices at the second moment.

Optionally, in this embodiment of the present application, the corresponding phase difference when the first terminal device and the second terminal device send the first signal includes a second phase difference.

It can be understood that in the coherent aggregation transmission method 2, the first terminal device does not compensate for the first phase difference when sending the first signal using the precoding matrix determined at the first moment, and the first terminal device only needs to calculate the signal according to the phase difference information and/or Or the frequency offset information compensates for the second phase difference. For example, assume that the first phase difference is 10° at the first moment and the second phase difference is 30° at the second moment. Since the precoding matrix determined at the first moment does not compensate for the phase difference of 10°, the second phase difference is 10°. A terminal device needs to compensate for a phase difference of 30°.

It should be understood that in the embodiment of the present application, "moment" corresponds to the time domain resource of the signal, or corresponds to the first symbol or the last symbol in the time domain resource of the signal. For example, in the codebook transmission mode, the first moment may be the first symbol corresponding to the time domain resource of the SRS sent by the terminal device for CSI measurement; or, in the non-codebook transmission mode, the first moment may be It is the first symbol corresponding to the time domain resource of the CSI-RS sent by the network device. The second moment may be the first symbol of the time domain resource that transmits the first signal.

Since the first moment is related to CSI measurement, and CSI measurement can be divided into measurement of SRS in codebook transmission mode and measurement of CSI-RS in non-codebook transmission mode, the following is based on the transmission time of SRS and the transmission of CSI-RS. Moment explains the first moment.

Optionally, in this embodiment of the present application, when the first terminal device determines to use the codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is when the first terminal device sends the second SRS to the network device. At the moment, the second SRS is used for CSI measurement of the uplink channel.

Or, optionally, the CSI measurement time determined by the first terminal device is when the second terminal device sends the third SRS to the network device. time, wherein the time when the second terminal device sends the third SRS to the network device is indicated to the first terminal device by the network device, and the third SRS is used for CSI measurement of the uplink channel.

It can be understood that in this embodiment of the present application, the time at which the first terminal device sends the second SRS may be earlier than the time at which the second terminal device sends the third SRS. Alternatively, the time at which the first terminal device sends the second SRS may be later than the time at which the second terminal device sends the third SRS. Wherein, when the time when the first terminal device sends the second SRS is different from the time when the second terminal device sends the third SRS, the first terminal device may select the maximum value or the minimum value between the two as the CSI measurement time, The embodiments of the present application do not specifically limit this.

For example, taking the schematic diagram of the measurement time when the first terminal device and the second terminal device use the codebook transmission method to perform aggregated transmission as shown in Figure 10, as shown in Figure 10, the first time is when the first terminal device sends At the time of the second SRS, the second SRS is used for CSI measurement of the uplink channel; or, the first time is the time when the second terminal device sends the third SRS, and the third SRS is used for CSI measurement of the uplink channel. It can be understood that the time when the second terminal device sends the third SRS may be before or after the time when the second terminal device sends the first SRS; or the third SRS may be the first SRS; or the first terminal device sends the second SRS. The time of the SRS may be before or after the time when the second terminal device sends the first SRS, which is not specifically limited in this embodiment of the present application.

It should be understood that in this embodiment of the present application, the second terminal device may send one or more SRSs to the network device before or after sending the first SRS to the network device; or, the second terminal device may send the first SRS to the network device. The SRS has not been sent to the network device before, and the embodiment of this application does not specifically limit this.

It can be understood that, in the case where the second terminal device has not sent an SRS to the network device before sending the first SRS to the network device, the third SRS may be the first SRS. That is to say, the CSI measurement time determined by the first terminal device is the time when the third SRS is sent.

Optionally, in this embodiment of the present application, when the first terminal device determines to use a non-codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is when the first terminal device receives the CSI from the network device. -RS moment. That is to say, in the case where the first terminal device determines to use non-codebook transmission to send the first signal, the first time is the time when the first terminal device receives the CSI-RS from the network device.

It should be understood that the time when the first terminal device receives the CSI-RS from the network device may be before or after the second terminal device sends the first SRS, which is not specifically limited in this embodiment of the present application.

The phase difference information, frequency offset information, and calculation method used in the implementation of this application are introduced below.

Optionally, in this embodiment of the present application, the phase difference information between the first terminal device and the second terminal device includes the phase difference between the first terminal device and the second terminal device obtained by the first terminal device measuring the first SRS. . The phase difference includes the phase difference caused by the frequency offset between the first terminal device and the second terminal and the phase difference caused by other factors. For details, please refer to the relevant section "8.1.2, Frequency Offset" in the preamble of the specific implementation. Description will not be repeated here.

Optionally, in this embodiment of the present application, the frequency offset information between the first terminal device and the second terminal device includes the frequency offset between the first terminal device and the second terminal device obtained by the first terminal device measuring the first SRS. .

Optionally, in this embodiment of the present application, the second terminal device may send the first SRS at multiple times. Correspondingly, the first terminal device can receive the first SRS from the second terminal device at multiple times, and measure the first SRS at the multiple times to obtain the relationship between the first terminal device and the second terminal device corresponding to different times. phase difference and/or frequency offset between them. That is to say, in the embodiment of the present application, the phase difference information between the first terminal device and the second terminal device may include the phase difference between the first terminal device and the second terminal device corresponding to different sending times of the first SRS. , the frequency offset information between the first terminal device and the second terminal device includes the frequency offset between the first terminal device and the second terminal device corresponding to different sending times of the first SRS.

For example, taking the two different moments of sending the first SRS shown in Figure 10 as the third moment and the fourth moment, and the third moment being before the fourth moment, as an example, between the first terminal device and the second terminal device The phase difference information between includes the phase difference between the first terminal device and the second terminal device corresponding to the third moment, which is Δψ _{c_s} (t3), and the phase difference between the first terminal device and the second terminal device corresponding to the fourth moment. The difference is Δψ _{c_s} (t4), and the frequency offset between the first terminal device and the second terminal device between the third time and the fourth time is Δf _{c_s} . Among them, _t3 represents the third moment, and _t4 represents the fourth moment.

Illustratively, in the embodiment of the present application, Δf _{c_s} , Δψ _{c_s} (t ₃ ), and Δψ _{c_s} (t ₄ ) can be obtained in the following manner. The specific methods are as follows:

The first terminal device uses channel estimation (such as SVD) based on receiving the first SRS from the second terminal device at times _t3 and _t4 . The total phase θ _{c_s} (t ₃ ) at time t ₃ and the total phase θ _{c_s} (t ₄ ) at time t ₄ are obtained. Among them, θ _{c_s} (t ₃ ) can be expressed by formula (9), θ _{c_s} (t ₄ ) can be expressed by formula (10), and θ _{c_s} (t ₃ ) and θ _{c_s} (t ₄ ) are known quantities.
θ _{c_s} (t ₃ )=2πΔf _{c_s} ·t ₃ +Δψ _{c_s} (t ₃ ) Formula (9)
θ _{c_s} (t ₄ )＝2πΔf _{c_s} ·t ₄ +Δψ _{c_s} (t ₃ ) Formula (10)

Δf _{c_s} can be obtained by subtracting formula (9) and formula (10) simultaneously, and Δf _{c_s} can be calculated from formula (11).
Δf _{c_s} =(θ _{c_s} (t ₄ )-θ _{c_s} (t ₃ ))/(2π(t ₄ -t ₃ ))) Formula (11)

According to formula (11) and formula (9) or formula (10), Δψ _{c_s} (t ₃ ) can be calculated. Among them, when Δψ _{c_s} (t ₃ ) and Δf _{c_s} are known, Δψ _{c_s} (t ₄ ) can be calculated according to formula (12).
Δψ _{c_s} (t ₄ )=2π(Δf _{c_s} ·(t ₄ -t ₃ ))+Δψ _{c_s} (t ₃ ) Formula (12)

In formula (12), 2π(Δf _{c_s} ·(t ₄ -t ₃ )) represents the corresponding phase between the fourth time and the third time caused by the frequency offset between the first terminal device and the second terminal device. Difference.

It should be understood that, referring to FIG. 10 again, the fourth moment may be earlier than the second moment, and the first moment may be earlier than the third moment. Alternatively, the third moment may be equal to the first moment; or the first moment and the fourth moment may be the same; or the first moment may be after the fourth moment, which is not specifically limited in the embodiments of the present application.

Optionally, in this embodiment of the present application, the first terminal device may determine the phase difference between the first terminal device and the second terminal device corresponding to the two different times based on the first SRS received at two different times. and/or frequency offset, and based on the phase difference and/or frequency offset between the first terminal equipment and the second terminal equipment corresponding to the two different times, it is estimated that the first terminal equipment and the second terminal equipment send the first signal corresponding phase difference.

The following describes the method in which the first terminal device estimates the corresponding phase difference when the first terminal device and the second terminal device send the first signal in conjunction with the third moment and the fourth moment shown in FIG. 10 .

Method 1: The first terminal device can estimate the corresponding phase difference when the first terminal device and the second terminal device send the first signal according to formula (13).
Δψ _{c_s} (t ₂ )=2π(Δf _{c_s} ·(t ₂ -t ₄ ))+Δψ _{c_s} (t ₄ ) Formula (13)

In formula (13), t ₂ represents the second time, Δψ _{c_s} (t ₂ ) represents the corresponding phase difference when the first terminal device and the second terminal device send the first signal, 2π(Δf _{c_s} ·(t ₂ +t ₄ )) represents the corresponding phase difference between the second time and the fourth time caused by the frequency offset between the first terminal device and the second terminal device. Among them, Δψ _{c_s} (t ₄ ) can be determined by formula (12).

Formula (14) can be obtained from formula (13) and formula (12). Among them, Δψ _{c_s} (t ₂ ) can be obtained through formula (14). That is to say, the phase difference and/or frequency offset information between the first terminal device and the second terminal device can be used to compensate for the corresponding phase difference and/or frequency when the first terminal device and the second terminal device send the first signal. Partial.
Δψ _{c_s} (t ₂ )=2π(Δf _{c_s} ·(t ₂ -t ₃ ))+Δψ _{c_s} (t ₃ ) Formula (14)

It can be understood that formula (14) can be used in coherent aggregation transmission mode 2 to compensate for the corresponding phase difference when the first terminal device and the second terminal device send the first signal.

Method 2: Since in the coherent aggregation transmission method 1, the phase difference corresponding to the first moment has been compensated by the precoding matrix, the first terminal device can only compensate the phase difference corresponding to when the first terminal device and the second terminal device send the first signal. Phase difference caused by frequency offset. Wherein, the first terminal device can estimate the corresponding frequency when the first terminal device and the second terminal device send the first signal based on the frequency offset Δf _{c_s} between the first terminal device and the second terminal device obtained at the third moment and the fourth moment. Phase difference caused by frequency offset. The phase difference caused by the corresponding frequency offset when the first terminal device and the second terminal device transmit the first signal can be obtained according to formula (15).
Δψ _{c_s} (t ₂ )=2π(Δf _{c_s} ·(t ₂ -t ₁ )) Formula (15)

In formula (15), t ₁ represents the first time, and 2π(Δf _{c_s} ·(t ₂ -t ₁ )) represents the relationship between the first terminal device and the second terminal device corresponding to the second time and the first time. The phase difference caused by the frequency offset between.

It can be understood that in coherent aggregation transmission mode 1, when the first terminal device and the second terminal device use codebook transmission to send the first signal, the first time represented by t ₁ is the time when the SRS is sent (for example, the first The second SRS sent by the terminal device, or the third SRS sent by the second terminal device). When the first terminal device and the second terminal device send the first signal using a non-codebook transmission method, the first time indicated by t ₁ is the time when the network device sends the CSI-RS.

It can be understood that Δψ _{c_s} (t ₂ ) in Formula (14) or Formula (15) can be calculated through the phase difference information and/or frequency offset information between the first terminal device and the second terminal device, that is, the first terminal device can be compensated. The corresponding phase difference and/or frequency offset when a terminal device and a second terminal device send the first signal.

Among them, the actions of the network device in the above steps S901 to S904 can be executed by the processor 601 in the communication device 600 shown in FIG. 6 by calling the application code stored in the memory 603 to instruct the network device to execute. The action of the first terminal device can be executed by the processor 601 in the communication device 600 shown in FIG. 6 by calling the application code stored in the memory 603 to instruct the first terminal device. This embodiment of the present application does not impose any limitation on this.

Optionally, in this embodiment of the present application, before the network device sends the first indication information to the first terminal device (step S902), it also includes:

The network device sends third indication information to the first terminal device. Correspondingly, the first terminal device receives the third indication information from the network device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M. That is to say, the first terminal device can obtain multiple SRS resources for phase calibration between the first terminal device and other terminal devices according to the third indication information, and then the first terminal device can receive signals on multiple time-frequency resources. Multiple different SRSs are used for phase calibration, thereby improving the efficiency of phase calibration.

Optionally, the SRS resource configuration information for which the M pieces of SRS resource configuration information are candidates may mean that the first terminal device receives the triggering signaling of one or more SRS resource configuration information among the M pieces of SRS resource configuration information. , the first terminal device performs phase calibration according to the one or more SRS resource configuration information. That is to say, the first indication information can be used to trigger N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information, so that the first terminal device performs phase calibration according to the N pieces of SRS resource configuration information.

For example, the third indication information may be high-layer signaling, such as RRC signaling. The third indication information may include the M pieces of SRS resource configuration information; or the third indication information may include index information of the M pieces of SRS resource configuration information.

Optionally, the first indication information may be MAC layer signaling or DCI signaling, which is not specifically limited in this embodiment of the present application.

Optionally, in this embodiment of the present application, after the first terminal device measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device (step S904), include:

The first terminal device compensates the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal according to the phase difference information and/or the frequency offset information, and sends the compensated first signal to the network device. , and the second terminal device sends the first signal to the network device. Correspondingly, the network device receives the compensated first signal from the first terminal device and receives the first signal from the second terminal device. Wherein, the first terminal device compensates the first signal according to the phase difference information and/or the frequency offset information.

For example, taking the first signal before precoding as x ₁ , the precoding matrix as V, and the phase difference as Δψ _{c_s} (t ₂ )=ψ in the above-mentioned method one or method two, the compensated first signal A signal can be expressed as e ^-jψ Vx ₁ or e ^jψ Vx ₁ . The precoding matrix is indicated by the network device, and the precoding matrix is the precoding matrix corresponding to the first moment. The implementation of the network device indicating the precoding matrix may include: when the first terminal device uses the codebook transmission mode to send the first signal, the network device indicates the precoding matrix through TPMI; or, when the first terminal device is not codebook When the first signal is sent in the transmission mode, the network device indicates the precoding matrix through the SRI. For this implementation, please refer to the description in the preamble of the specific embodiments, which will not be described again here.

It should be understood that when the first terminal device compensates the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal according to the phase difference information and/or the frequency offset information, the second terminal device There is no need to compensate the first signal.

It should be understood that in the codebook transmission mode, the precoding matrix corresponding to the first moment may refer to the precoding matrix determined by the network device based on the CSI measurement based on the SRS sent by the terminal device. In non-codebook transmission mode, the precoding moment corresponding to the first moment The matrix may refer to a precoding matrix determined by CSI measurement performed by the terminal device based on the CSI-RS sent by the network device.

It can be understood that according to codebook transmission, non-codebook transmission, coherent aggregation transmission mode 1, and coherent aggregation transmission mode 2, the phase calibration method provided by the embodiment of the present application can be applied to the following four scenarios.

Scenario 1. Using codebook transmission and coherent aggregation transmission method 1

In scenario one, the first terminal device needs to send the SRS for channel measurement to the network device before receiving the first SRS (step S903), or between step S903 and the first terminal device sending the compensated first signal. . Correspondingly, the network device may perform channel measurement based on the SRSs sent by the first terminal device and the second terminal device respectively, jointly determine the precoding matrices corresponding to the first terminal device and the second terminal device at the first time, and provide the information to the first terminal device. The terminal device sends uplink scheduling permission information. Wherein, the network device indicates the precoding matrix corresponding to the first terminal device through the TPMI in the uplink scheduling grant information, and then the first terminal device can send the compensated first signal.

Scenario 2: Using codebook transmission and coherent aggregation transmission method 2

Scenario 2 is similar to scenario 1. The difference is that the network device performs channel measurement based on the SRS sent by the first terminal device and the second terminal device respectively, and independently determines the corresponding SRS of the first terminal device and the second terminal device at the first moment. precoding matrix. Wherein, the precoding matrix corresponding to the first terminal device and the precoding matrix corresponding to the second terminal device are independently determined, and the first phase difference and/or the first frequency offset caused by the first terminal device and the second terminal device are not compensated. phase difference.

Scenario 3: Using non-codebook transmission and coherent aggregation transmission method 2

In scenario three, the network device needs to send CSI-RS to the first terminal device and the second terminal device respectively. Correspondingly, the first terminal device and the second terminal device respectively receive the CSI-RS from the network device, and according to the non-codebook transmission process, respectively send the SRS precoded by the precoding matrix to the network device to obtain their corresponding precoding. Vector, for details, please refer to the relevant description of "7.2. Non-codebook transmission" in the preamble of the specific implementation.

It can be understood that in scenario three, the network device may send the CSI-RS to the first terminal device and the second terminal device before step S903, or between step S903 and the first terminal device sending the compensated first signal.

Scenario 4: Using non-codebook transmission and coherent aggregation transmission method 1

Scenario 4 is similar to scenario 3, except that the first terminal device and the second terminal device need to share channel information to jointly determine the precoding matrix.

The specific implementation of scenario four is introduced below.

Optionally, as shown in Figure 11, the phase calibration method provided by the embodiment of the present application further includes the following steps after step S904:

Step S905: The network device sends third instruction information to the second terminal device. Correspondingly, the second terminal device receives the third indication information from the network device. The third instruction information is used to instruct the second terminal device to send the first channel information to the first terminal device. Wherein, the first channel information includes a channel matrix obtained by measuring CSI-RS by the second terminal device. The first channel matrix is a channel matrix of a downlink channel between the second terminal device and the network device.

For example, the second terminal device may receive the CSI-RS from the network device and measure the CSI-RS to obtain the first channel information. Wherein, the first channel information includes a first channel matrix obtained by measuring CSI-RS by the second terminal device.

It can be understood that the second terminal device can receive the CSI-RS from the network device through the CSI-RS resource configuration information configured by high-layer signaling.

Optionally, in this embodiment of the present application, the third indication information includes first resource configuration information for transmitting information between the first terminal device and the second terminal device. The resource configuration information includes time-frequency resources, modulation mode, code rate, or RV.

Optionally, in this embodiment of the present application, the third indication information also includes second resource configuration information, and the second resource configuration information is used to instruct the second terminal device to send the first channel information to the first terminal device at a granularity. The granularity of the first channel information refers to the granularity of frequency domain resources corresponding to the channel matrix obtained by measuring the CSI-RS by the second terminal device. The granularity of frequency domain resources can be configured as broadband (ie, the entire bandwidth), subbands, and subcarriers. It can be understood that when the granularity of the frequency domain resources corresponding to the channel matrix is configured as wideband, the first channel information includes a channel matrix corresponding to the entire bandwidth. When the granularity of the frequency domain resources corresponding to the channel matrix is configured as subbands, the first channel information may include the channel matrix corresponding to each subband in the entire bandwidth. When the granularity of the frequency domain resources corresponding to the channel matrix is configured as subcarriers, the first channel information may include the channel matrix corresponding to each subcarrier in the entire bandwidth.

S906. The network device sends the second instruction information to the first terminal device. Correspondingly, the first terminal device receives the message from the network device Second instruction information for the device. The second instruction information is used to instruct the first terminal device to send the first precoding matrix to the second terminal device. The first precoding matrix is a precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal.

Optionally, in this embodiment of the present application, the second indication information may also include third resource configuration information and fourth resource configuration information. The third resource configuration information is similar to the first resource configuration information and is used for transmission resource configuration between the first terminal device and the second terminal device. The fourth resource configuration information is similar to the second resource configuration information and is used to indicate the granularity of the frequency domain resources corresponding to the channel matrix. For details, please refer to the relevant description of the first resource configuration information and the second resource configuration information, which will not be described again here. .

It should be understood that in this embodiment of the present application, there is no necessary order of execution between step S905 and step S906. Step S905 may be executed first, and then step S906 may be executed; step S906 may be executed first, and then step S905 may be executed; or step S905 may be executed first, and then step S905 may be executed. The above step S905 and step S906 are executed at the same time, and this is not specifically limited in the embodiment of the present application.

S907. The second terminal device sends the first channel information to the first terminal device according to the third instruction information. Correspondingly, the first terminal device receives the first channel information from the second terminal device. That is to say, by sending the first channel information to the first terminal device, the second terminal device can share the channel matrix of the downlink channel between the second terminal device and the network device between the first terminal device and the second terminal device.

S908. The first terminal device determines the first precoding matrix according to the first channel information and the second channel information obtained by measuring the CSI-RS by the first terminal device. Wherein, the first terminal device may receive the CSI-RS from the network device, and measure the CSI-RS to obtain the second channel information. The second channel information may include a second channel matrix, and the second channel matrix is a channel matrix of a downlink channel between the first terminal device and the network device.

Optionally, in this embodiment of the present application, the first terminal device may combine the first channel matrix and the second channel matrix to jointly determine the first precoding matrix in a CJT manner.

Optionally, in this embodiment of the present application, the first precoding matrix includes a precoding matrix corresponding to the first terminal device and a precoding matrix corresponding to the second terminal device.

Optionally, in this embodiment of the present application, after the first terminal device measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device (step S903), A terminal device determines the first precoding matrix according to the first channel information and the second channel information obtained by measuring the CSI-RS by the first terminal device (step S908), including: the first terminal device determines the first precoding matrix according to the phase difference information and/or frequency The bias information, the first channel information and the second channel information determine the first precoding matrix. That is to say, when determining the first precoding matrix, the first terminal device may compensate the phase difference information and/or frequency offset information obtained in step S903 in the first precoding matrix.

Optionally, in this embodiment of the present application, the first terminal device compensates the phase difference information and/or frequency offset information on the second channel matrix, and based on the first channel matrix in the first channel information and the compensated second The channel matrix determines the compensated first precoding matrix.

Or, optionally, the first terminal device determines the first precoding matrix according to the first channel information and the second channel information, and compensates the first terminal device in the first precoding matrix with the phase difference information and/or frequency offset information. on the corresponding precoding matrix. Exemplarily, the first precoding matrix includes a precoding matrix V ₁ corresponding to the first terminal device and a precoding matrix V ₂ corresponding to the second terminal device. The first terminal device converts Δψ _{c_s} ( t ₂ )=ψ compensation is on the precoding matrix V ₁ and can be expressed as e ^-jψ V ₁ or e ^jψ V ₁ .

S909. The first terminal device sends the first precoding matrix to the second terminal device according to the second instruction information. Correspondingly, the second terminal device receives the first precoding matrix from the first terminal device. That is to say, the first terminal device sends the first precoding matrix to the second terminal device, so that the first terminal device and the second terminal device can share the first precoding matrix.

It can be understood that after the first terminal device and the second terminal device respectively determine the corresponding precoding matrix, the SRS can be precoded according to the corresponding precoding matrix, and the precoded SRS can be sent to the network device, and then the network The device indicates the corresponding precoding vectors of the first terminal device and the second terminal device by sending respective corresponding SRIs to the first terminal device and the second terminal device. For details, please refer to "7.1.2. The relevant instructions for "non-codebook transmission" will not be repeated here.

Optionally, in this embodiment of the present application, steps S905 to S909 may also be executed before step S903.

Optionally, as shown in Figure 11, in this embodiment of the present application, after step S909, it also includes:

S910. The first terminal device precodes the first signal according to the precoding matrix corresponding to the first terminal device in the first precoding matrix, and according to the phase difference information between the first terminal device and the second terminal device and/or The frequency offset information is applied to the first signal compensation, and sends the precoded and compensated first signal to the network device. Correspondingly, the network device receives the precoded and compensated first signal from the first terminal device.

It can be understood that if the first terminal device performs phase compensation on the first precoding matrix in step S908, then in step S910, the first terminal device may not need to perform phase compensation according to the phase difference between the first terminal device and the second terminal device. The first signal is compensated by the information and/or the frequency offset information.

S911. The second terminal device precodes the first signal according to the precoding matrix corresponding to the second terminal device in the first precoding matrix, and sends the precoded first signal to the network device. Correspondingly, the network device receives the first signal from the second terminal device.

Since in the embodiment of the present application, the first indication information indicates that the first SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices, the first terminal device can receive the first SRS resource configuration information from the second terminal device. The first SRS of the terminal equipment, and measuring the first SRS to obtain the phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, through which the phase difference information and/or the frequency offset information can be Compensating for the phase difference caused by inconsistent phase changes and/or frequency offset changes between the first terminal device and the second terminal device when the first terminal device and the second terminal device transmit the first signal at the same time, thereby improving the performance of the first terminal device and the second terminal device to aggregate the coherence between the transmitted signals to improve the power gain of co-directional superposition of multi-channel signals. Therefore, based on the phase calibration method provided by the embodiments of the present application, when the phase changes and/or frequency offset changes among multiple terminal devices are inconsistent, the coherence of the aggregated and transmitted multi-channel signals can be improved to improve the co-directional superposition of the multi-channel signals. Power gain.

Among them, the actions of the network device in the above steps S901 to S911 can be executed by the processor 601 in the communication device 600 shown in FIG. 6 by calling the application code stored in the memory 603 to instruct the network device to execute. The action of the first terminal device can be executed by the processor 601 in the communication device 600 shown in FIG. 6 by calling the application code stored in the memory 603 to instruct the first terminal device. This embodiment of the present application does not impose any limitation on this.

It should be understood that the above solution only takes the aggregation transmission of the first terminal device and the second terminal device as an example to illustrate the phase calibration method of the present application. The above solution is also applicable to the scenario where three or more terminal devices perform aggregation transmission.

For example, taking three terminal devices including a first terminal device, a second terminal device, and a third terminal device, the first terminal device receives indication information from the network device, and the indication information indicates the third terminal device received by the first terminal device. An SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices; and the second terminal device receives indication information from the network device, the indication information is used to indicate the second SRS resource received by the second terminal device The configuration information is used for phase calibration between the second terminal equipment and other terminal equipment; and the third terminal equipment receives indication information from the network equipment, the indication information indicates that the third SRS resource configuration information received by the third terminal equipment is used for the third Phase calibration between the terminal equipment and other terminal equipment, and then the first terminal equipment, the second terminal equipment, or the third terminal equipment respectively receive their respective SRS, and measure and obtain the relationship between the first terminal equipment, the second terminal equipment, and the third terminal equipment. phase difference information and/or frequency offset information between Wherein, the phase difference information and/or frequency offset information between the first terminal equipment, the second terminal equipment and the third terminal equipment are used to compensate the phase between the first terminal equipment, the second terminal equipment and the third terminal equipment. difference and/or frequency offset.

It can be understood that in the above embodiments, the methods and/or steps implemented by the network device can also be implemented by components (such as chips or circuits) that can be used in the network device; the methods and/or steps implemented by the terminal device, It can also be implemented by components (such as chips or circuits) that can be used in terminal devices.

The above mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various network elements. Correspondingly, embodiments of the present application also provide a communication device, which is used to implement the above various methods. The communication device may be the terminal device in the above method embodiment, or a device including the above terminal device, or a component that can be used in the terminal device; or the communication device may be a network device in the above method embodiment, or include the above It can be understood that the device of a network device, or a component that can be used in a network device, is that in order to implement the above functions, the communication device includes corresponding hardware structures and/or software modules that perform each function. Persons skilled in the art should easily realize that, with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

Embodiments of the present application can divide the communication device into functional modules according to the above method embodiments. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integration The modules can be implemented in the form of hardware or software function modules. It should be understood that the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.

For example, taking the communication device as the first terminal device in the above method embodiment, FIG. 12 shows a schematic structural diagram of the first terminal device 120. The first terminal device 120 includes a transceiver module 1201 and a processing module 1202. The transceiver module 1201, which may also be called a transceiver unit, is used to implement the transceiver function. For example, it may be a transceiver circuit, a transceiver, a transceiver, or a communication interface.

Among them, the transceiver module 1201 is used to receive first indication information from the network device. The first indication information is used to instruct the first terminal device to receive the first SRS resource configuration information for use between the first terminal device and other terminal devices. phase calibration; the transceiver module 1201 is also configured to receive the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information; the processing module 1202 is configured to perform the first SRS Measurement is performed to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device. The phase difference information and/or frequency offset information are used to compensate the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal.

In some embodiments, the corresponding phase difference and/or frequency offset when the first terminal device and the second terminal device send the first signal include the difference between the first phase difference and the second phase difference, and the first phase difference is The phase difference between the first terminal device and the second terminal device at the first time, and the second phase difference is the phase difference between the first terminal device and the second terminal device at the second time. The first time is the CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device.

In some embodiments, the corresponding frequency offset when the first terminal device and the second terminal device send the first signal includes a difference between the first frequency offset and the second frequency offset. The first frequency offset is the frequency offset between the first terminal device and the second terminal device at the first time, and the second frequency offset is the frequency offset between the first terminal device and the second terminal device at the second time. The first time is the CSI measurement time determined by the first terminal device, and the second time is the time when the first terminal device sends the first signal to the network device.

In some embodiments, the first indication information includes first SRS resource configuration information, and the first SRS resource configuration information includes usage. Wherein, usage indicates that the first SRS resource configuration information is used for the first terminal device to receive SRS; or usage indicates that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices.

In some embodiments, the first indication information includes first SRS resource configuration information, and the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol.

In some embodiments, when the first terminal device determines to use a non-codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is the time when the first terminal device receives the CSI-RS from the network device. .

In some embodiments, the transceiver module 1201 is also configured to receive second indication information from the network device. The second indication information is used to instruct the first terminal device to send the first precoding matrix to the second terminal device. The first The precoding matrix is the precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal; the transceiver module 1201 is also used to receive the first channel information from the second terminal device, The first channel information includes a channel matrix obtained by measuring the CSI-RS by the second terminal device; the processing module 1202 is also used to obtain the second channel information based on the first channel information and the first terminal device by measuring the CSI-RS. Determine the first precoding matrix; the transceiving module 1201 is also used to send the first precoding matrix to the second terminal device.

In some embodiments, when the first terminal device determines to use the codebook transmission method to send the first signal, the CSI measurement time determined by the first terminal device is the time when the first terminal device sends the second SRS to the network device. The second SRS is used for CSI measurement of the uplink channel; or, the CSI measurement time determined by the first terminal device is the time when the second terminal device sends the third SRS to the network device. Wherein, the time when the second terminal device sends the third SRS to the network device is instructed by the network device to the first terminal device, and the third SRS is used for CSI measurement of the uplink channel.

In some embodiments, the transceiver module 1201 is also configured to send capability information to the network device before receiving the first indication information from the network device. The capability information is used to indicate that the first terminal device is capable of obtaining the first terminal device and the third terminal device. Capability of phase difference information and/or frequency offset information between two terminal devices.

In some embodiments, the transceiving module 1201 is also configured to receive third indication information from the network device before receiving the first indication information from the network device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.

All relevant content of each step involved in the above method embodiments can be quoted from the functional description of the corresponding functional module, and will not be described again here.

In this embodiment of the present application, the first terminal device 120 is presented in the form of dividing various functional modules in an integrated manner. A "module" here may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that may provide the above functions. In a simple embodiment, those skilled in the art can imagine that the first terminal device 120 may take the form of the communication device 600 shown in FIG. 6 .

For example, the processor 601 in the communication device 600 shown in FIG. 6 can cause the communication device 600 to execute the phase calibration method in the above method embodiment by calling the computer execution instructions stored in the memory 603.

Specifically, the functions/implementation processes of the transceiver module 1201 and the processing module 1202 in Figure 12 can be implemented by the processor 601 in the communication device 600 shown in Figure 6 calling the computer execution instructions stored in the memory 603. Alternatively, the function/implementation process of the processing module 1202 in Figure 12 can be realized by the processor 601 in the communication device 600 shown in Figure 6 calling the computer execution instructions stored in the memory 603. The function of the transceiver module 1201 in Figure 12 /The implementation process can be implemented through the communication interface 604 in the communication device 600 shown in FIG. 6 .

Since the first terminal device 120 provided by the embodiment of the present application can perform the above-mentioned phase calibration method, the technical effect it can obtain can be referred to the above-mentioned method embodiment, which will not be described again here.

Or, for example, taking the communication device as the network device in the above method embodiment, FIG. 13 shows a schematic structural diagram of a network device 130. The network device 130 includes a transceiver module 1301 and a processing module 1302. The transceiver module 1301, which may also be called a transceiver unit, is used to implement the transceiver function. For example, it may be a transceiver circuit, a transceiver, a transceiver, or a communication interface.

Among them, the processing module 1302 is used to obtain the first indication information, which indicates that the first SRS source configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices; the transceiver module 1301, used to send first indication information to the first terminal device.

In some embodiments, the transceiver module 1301 is also configured to send second indication information to the first terminal device. The second indication information is used to instruct the first terminal device to send the first precoding matrix to the second terminal device. A precoding matrix is a precoding matrix corresponding to the first time when the first terminal device determines to use a non-codebook transmission method to send the first signal. The first time is when the first terminal device receives the CSI-RS from the network device. time.

In some embodiments, the processing module 1302 is used to obtain the first indication information including: receiving capability information from the first terminal device through the transceiver module 1301. The capability information is used to indicate that the first terminal device is capable of obtaining the first terminal device and the first terminal device. The capability of the phase difference information and/or frequency offset information between the two terminal devices; the first indication information is determined based on the capability information.

Exemplarily, the transceiving module 1301 is also configured to send third indication information to the first terminal device before sending the first indication information to the first terminal device. The third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidate SRS resource configuration information for phase calibration between the first terminal device and other terminal devices, and M is a positive integer greater than 1. . The first indication information is also used to indicate that the N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.

In this embodiment of the present application, the network device 130 is presented in the form of dividing various functional modules in an integrated manner. A "module" here may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that may provide the above functions. In a simple embodiment, those skilled in the art can imagine that the network device 130 may take the form of the communication device 600 shown in FIG. 6 .

Specifically, the functions/implementation processes of the transceiver module 1301 and the processing module 1302 in Figure 13 can be implemented by the processor 601 in the communication device 600 shown in Figure 6 calling the computer execution instructions stored in the memory 603. Alternatively, the function/implementation process of the processing module 1302 in Figure 13 can be used to call the memory 603 through the processor 601 in the communication device 600 shown in Figure 6 The function/implementation process of the transceiver module 1301 in Figure 13 can be implemented through the communication interface 604 in the communication device 600 shown in Figure 6 .

Since the network device 130 provided in this embodiment can perform the above-mentioned phase calibration method, the technical effects it can obtain can be referred to the above-mentioned method embodiments, which will not be described again here.

It should be understood that one or more of the above modules or units may be implemented in software, hardware, or a combination of both. When any of the above modules or units is implemented in software, the software exists in the form of computer program instructions and is stored in the memory. The processor can be used to execute the program instructions and implement the above method flow. The processor can be built into an SoC (System on a Chip) or ASIC, or it can be an independent semiconductor chip. In addition to the core used to execute software instructions for calculation or processing, the processor can further include necessary hardware accelerators, such as field programmable gate array (FPGA), PLD (programmable logic device) , or a logic circuit that implements dedicated logic operations.

When the above modules or units are implemented in hardware, the hardware can be a CPU, a microprocessor, a digital signal processing (DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, Any one or any combination of SoC, FPGA, PLD, dedicated digital circuits, hardware accelerators or non-integrated discrete devices, which can run the necessary software or not rely on software to perform the above method flow.

Optionally, the embodiment of the present application also provides a communication device (for example, the communication device may be a chip or a chip system). The communication device includes a processor and is used to implement the method in any of the above method embodiments. In a possible design, the communication device further includes a memory. The memory is used to store necessary program instructions and data. The processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the above method embodiments. Of course, the memory may not be in the communication device. When the communication device is a chip system, it may be composed of a chip or may include a chip and other discrete devices, which is not specifically limited in the embodiments of the present application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it 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 computer program instructions are loaded and executed on a computer, processes or functions according to embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., computer instructions may be transmitted from a website, computer, server or data center via a wired (e.g. Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or include one or more data storage devices such as servers and data centers that can be integrated with the media. Available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (SSD)), etc.

Although the present application has been described herein in connection with various embodiments, in practicing the claimed application, those skilled in the art can understand and implement the disclosure by reviewing the drawings, the disclosure, and the appended claims. Other variations of the embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may perform several of the functions recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not mean that a combination of these measures cannot be combined to advantageous effects.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations may be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are intended to be merely illustrative of the application as defined by the appended claims and are to be construed to cover any and all modifications, variations, combinations or equivalents within the scope of the application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A phase calibration method, characterized in that the method includes:

The first terminal device receives first indication information from the network device. The first indication information indicates that the first sounding reference signal SRS resource configuration information received by the first terminal device is used for the first terminal device and other terminal devices. phase calibration between;

The first terminal device receives the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and measures the first SRS to obtain the result. Phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, the phase difference information and/or frequency offset information are used to compensate the first terminal equipment and the second terminal equipment. The corresponding phase difference and/or frequency offset when the terminal device sends the first signal.
The method of claim 1, wherein the phase difference corresponding to when the first terminal device and the second terminal device send the first signal includes the difference between the first phase difference and the second phase difference. , the first phase difference is the phase difference between the first terminal device and the second terminal device at the first moment, and the second phase difference is the phase difference between the first terminal device and the second terminal device. The phase difference between devices at a second time, wherein the first time is the channel state information CSI measurement time determined by the first terminal device, and the second time is the first terminal device transmitting data to the network The moment when the device sends the first signal.
The method according to claim 1 or 2, characterized in that, when the first terminal device and the second terminal device send the first signal, the corresponding frequency offset includes the difference between the first frequency offset and the second frequency offset. The difference value, the first frequency offset is the frequency offset between the first terminal equipment and the second terminal equipment at the first moment, the second frequency offset is the frequency offset between the first terminal equipment and the second terminal equipment The frequency offset between devices at a second time, wherein the first time is the CSI measurement time determined by the first terminal device, and the second time is the time the first terminal device sends to the network device. The moment of the first signal.
The method according to any one of claims 1 to 3, characterized in that the first indication information includes the first SRS resource configuration information, the first SRS resource configuration information includes a usage indication, and the usage Indicate that the first SRS resource configuration information is used for the first terminal device to receive SRS; or, the usage indicates that the first SRS resource configuration information is used for the phase between the first terminal device and other terminal devices. calibration.
The method according to any one of claims 1 to 3, characterized in that the first indication information includes the first SRS resource configuration information, and the first SRS resource configuration information includes time domain resource information corresponding to The symbol type is descending symbol.
The method according to any one of claims 2 to 5, characterized in that, when the first terminal device determines to use a non-codebook transmission method to send the first signal, the first terminal device determines The CSI measurement time is the time when the first terminal device receives the channel state information reference signal CSI-RS from the network device.
The method according to any one of claims 1-6, characterized in that the method further includes:

The first terminal device receives second indication information from the network device, and the second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device. A precoding matrix is a precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to transmit the first signal;

The first terminal device receives first channel information from the second terminal device, where the first channel information includes a channel matrix obtained by measuring CSI-RS by the second terminal device;

The first terminal device determines the first precoding matrix according to the first channel information and the second channel information obtained by measuring the CSI-RS by the first terminal device;

The first terminal device sends the first precoding matrix to the second terminal device.
The method according to any one of claims 2 to 5, characterized in that, when the first terminal device determines to use a codebook transmission method to send the first signal, the CSI determined by the first terminal device The measurement time is the time when the first terminal device sends the second SRS to the network device, and the second SRS is used for CSI measurement of the uplink channel; or, the CSI measurement time determined by the first terminal device is the The moment when the second terminal device sends the third SRS to the network device, wherein the moment when the second terminal device sends the third SRS to the network device is indicated by the network device to the first terminal equipment, the third SRS is used for CSI measurement of the uplink channel.
The method according to any one of claims 1 to 8, characterized in that, before the first terminal device receives the first indication information from the network device, the method further includes:

The first terminal device receives third indication information from the network device, and the third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidates for the first terminal device. SRS resource configuration information for phase calibration with other terminal equipment, M is a positive integer greater than 1;

The first indication information is also used to indicate that N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.
The method according to any one of claims 1 to 9, characterized in that, before the first terminal device receives the first indication information from the network device, the method further includes:

The first terminal device sends capability information to the network device, where the capability information is used to indicate that the first terminal device is capable of obtaining phase difference information and/or frequency between the first terminal device and other terminal devices. The ability to bias information.
A phase calibration method, characterized in that the method includes:

The network device obtains first indication information, the first indication information indicates that the first sounding reference signal SRS resource configuration information received by the first terminal device is used for phase calibration between the first terminal device and other terminal devices;

The network device sends the first indication information to the first terminal device.
The method of claim 11, wherein the first indication information includes the first SRS resource configuration information, the first SRS resource configuration information includes a usage indication, and the usage indicates the first The SRS resource configuration information is used for the first terminal device to receive SRS; or the usage indicates that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices.
The method according to claim 11, characterized in that the first indication information includes the first SRS resource configuration information, and the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol. .
The method according to any one of claims 11-13, characterized in that the method further includes:

The network device sends second indication information to the first terminal device. The second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device. The first precoding matrix The matrix is the precoding matrix corresponding to the first moment when the first terminal device determines to use a non-codebook transmission method to send the first signal, and the first moment is when the first terminal device receives a signal from the network device. The time of the channel state information reference signal CSI-RS.
The method according to any one of claims 11-14, characterized in that the network device obtains the first indication information, including:

The network device receives capability information from the first terminal device, and the capability information is used to indicate that the first terminal device is capable of obtaining phase difference information between the first terminal device and other terminal devices and/or Capability of frequency offset information;

The network device determines the first indication information according to the capability information.
The method according to any one of claims 11 to 15, characterized in that, before the network device sends the first indication information to the first terminal device, the method further includes:

The network device sends third indication information to the first terminal device, and the third indication information indicates that the M pieces of SRS resource configuration information received by the first terminal device are candidates for use between the first terminal device and the first terminal device. SRS resource configuration information for phase calibration between other terminal devices, M is a positive integer greater than 1;

The first indication information is also used to indicate that N pieces of SRS resource configuration information among the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer less than or equal to M.
A communication device, characterized in that the communication device is used to perform the phase calibration method according to any one of claims 1-10.
A communication device, characterized in that the communication device is configured to perform the phase calibration method according to any one of claims 11-16.
A communication device, characterized by including:

a processor coupled to a memory;

The processor is configured to execute a computer program stored in the memory, so that the communication device executes the phase calibration method as claimed in any one of claims 1-10, or the communication device executes the phase calibration method as claimed in any one of the claims. The phase calibration method described in any one of 11-16.
A communication device, characterized by including:

Processor and interface circuit; where,

The interface circuit is used to receive code instructions and transmit them to the processor;

The processor is configured to run the code instructions, so that the communication device performs the phase calibration method according to any one of claims 1-10, or causes the communication device to perform the phase calibration method according to any one of claims 11-16. The phase calibration method described in the item.
A communication device, characterized in that the communication device includes a processor and a transceiver, the transceiver is used for information exchange between the communication device and other communication devices, and the processor executes program instructions so that the The communication device performs the phase calibration method according to any one of claims 1-10, or causes the communication device to perform the phase calibration method according to any one of claims 11-16.
A computer-readable storage medium, characterized in that the computer-readable storage medium includes a computer program or instructions, and when the computer program or instructions are run on a computer, the computer is caused to execute as claimed in claims 1-10 The phase calibration method according to any one of claims 11-16, or causing the computer to perform the phase calibration method according to any one of claims 11-16.
A computer program product, characterized in that the computer program product includes a computer program or instructions that, when the computer program or instructions are run on a computer, cause the computer to execute the steps as claimed in any one of claims 1-10. or causing the computer to perform the phase calibration method as described in any one of claims 11-16.
A communication method, characterized in that the method includes:

The network device obtains the first instruction information;

The network device sends the first indication information to the first terminal device, and the first indication information indicates that the first sounding reference signal SRS resource configuration information received by the first terminal device is used for the first terminal device and the first terminal device. Phase calibration between other end devices;

The first terminal device receives first indication information from the network device;

The first terminal device receives the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and measures the first SRS to obtain the result. Phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, the phase difference information and/or frequency offset information are used to compensate the first terminal equipment and the second terminal equipment. The corresponding phase difference and/or frequency offset when the terminal device sends the first signal.
A communication system, characterized in that the communication system includes: a first terminal device and a network device; wherein the first terminal device is used to perform the phase calibration method according to any one of claims 1-10 , the network device is configured to perform the phase calibration method according to any one of claims 11-16.