CN117640312A

CN117640312A - Phase calibration method and communication device

Info

Publication number: CN117640312A
Application number: CN202211021005.3A
Authority: CN
Inventors: 余健; 许华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2024-03-01
Also published as: WO2024041171A1

Abstract

The embodiment of the application provides a phase calibration method and a communication device, which can improve the coherence of a multi-channel signal transmitted in an aggregation way when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent so as to improve the power gain of the co-directional superposition of the multi-channel signal. The method comprises the following steps: the first terminal equipment receives first indication information from the network equipment, receives a first SRS from the second terminal equipment on a time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. 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 the frequency offset information is used for compensating phase difference and/or frequency offset corresponding to the first terminal equipment and the second terminal equipment when the first terminal equipment sends the first signal.

Description

Phase calibration method and communication device

Technical Field

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

Background

In a wireless communication system, a terminal device transmits information to a network device called Uplink (UP) communication. In uplink communication, a single terminal device is limited by uplink transmission power, and the transmission rate is generally low, so that the requirement of high-rate service cannot be met.

At present, through multi-terminal device cooperative transmission, data to be transmitted can be aggregated and transmitted by multiple paths of signals corresponding to a plurality of terminal devices, so that the multiple paths of signals of the aggregated and transmitted form homodromous superposition to obtain power gain when reaching network devices, and further, the uplink transmission rate is improved. However, in some scenarios, the multiple signals transmitted in an aggregate manner cannot form a co-directional superposition when reaching the network device, which may result in a failure to obtain a power gain.

Disclosure of Invention

According to the phase calibration method and the communication device, when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent, the coherence of the multi-channel signals transmitted in an aggregation mode can be improved, and the power gain of the co-directional superposition of the multi-channel signals can be improved.

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

in a first aspect, a phase calibration method is provided, which may be performed by a first terminal device, or a component of the first terminal device, for example, a processor, a chip, or a chip system of the first terminal device, or a logic module or software capable of implementing all or part of the functions of the first terminal device. The following description will be made on the case where the method is executed by the first terminal apparatus. The method comprises the following steps: the first terminal equipment receives first indication information from the network equipment, receives a first SRS from the second terminal equipment on a time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. 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 the frequency offset information is used for compensating phase difference and/or frequency offset corresponding to the first terminal equipment and the second terminal equipment when the first terminal equipment sends the first signal. In the embodiment of the present application, the first indication information indicates that the first SRS resource allocation 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 may receive the first SRS from the second terminal device, and measure the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device, and by using the phase difference information and/or frequency offset information, a phase difference caused by that a phase change and/or a frequency offset change between the first terminal device and the second terminal device are inconsistent when the first terminal device and the second terminal device send the first signal at the same time can be compensated, so that coherence between signals transmitted by aggregation of the first terminal device and the second terminal device can be improved, and power gain of the multi-channel signal co-directional superposition can be improved. Therefore, based on the phase calibration method provided by the embodiment of the application, the coherence of the multi-channel signal transmitted in an aggregation manner can be improved when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent, so that the power gain of the co-directional superposition of the multi-channel signal can be improved.

With reference to the first aspect, in one possible implementation manner, the phase difference corresponding to 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 a phase difference between the first terminal device and the second terminal device at a first moment, and the second phase difference is a phase difference between the first terminal device and the second terminal device at a second moment. The first moment is a Channel State Information (CSI) measurement moment determined by the first terminal equipment. The second time is when the first terminal device sends the first signal to the network device.

With reference to the first aspect, in one possible implementation manner, the frequency offset corresponding to 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 of the first terminal equipment and the second terminal equipment at a first moment, and the second frequency offset is the frequency offset of the first terminal equipment and the second terminal equipment at a second moment. The first time is the CSI measurement time determined by the first terminal equipment, and the second time is the time when the first terminal equipment sends the first signal to the network equipment.

With reference to the first aspect, in a possible implementation manner, the first indication information includes first SRS resource configuration information. The first SRS resource configuration information comprises a usage indication user, wherein the usage indication user indicates that the first SRS resource configuration information is used for receiving SRS by the first terminal equipment; 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. That is, the first indication information may be information in which a user is configured to be "received" in the first SRS resource configuration information, so that the first SRS resource configuration information may be implicitly indicated for phase calibration between the first terminal device and the other terminal devices. Moreover, since the SRS resource configuration information itself is used for the terminal device to transmit the SRS, in the case where the SRS resource configuration information is used for phase calibration, it may be implicitly indicated that the SRS resource configuration information is used for the terminal device to receive the SRS.

With reference to the first aspect, in one possible implementation manner, the first indication information includes first SRS resource configuration information, and a symbol type corresponding to time domain resource information included in the first SRS resource configuration information is a downlink symbol. That is, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, the first SRS resource configuration information may be indicated to be used for receiving the SRS. That is, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, the first SRS resource configuration information may be indicated to be used for receiving the SRS, and further, the first SRS resource configuration information is implicitly indicated to be used for phase calibration between the first terminal device and other terminal devices.

With reference to the first aspect, in one possible implementation manner, in a case where the first terminal device determines to send the first signal using a non-codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device receives a channel state information reference signal CSI-RS from the network device.

With reference to the first aspect, in one possible implementation manner, the method further includes: the first terminal equipment receives second indication information from the network equipment, wherein the second indication information is used for indicating the first terminal equipment to send a first precoding matrix to the second terminal equipment, and the first precoding matrix determines a precoding matrix corresponding to a first moment when the first terminal equipment sends a first signal by using a non-codebook transmission mode; the method comprises the steps that first terminal equipment receives first channel information from second terminal equipment, wherein the first channel information comprises a channel matrix obtained by measuring the CSI-RS by the second terminal equipment; the first terminal equipment determines a first precoding matrix according to the first channel information and second channel information obtained by the first terminal equipment for measuring the CSI-RS; the first terminal device sends a first precoding matrix to the second terminal device. That is, the second terminal device may enable sharing of a channel matrix of a downlink channel between the second terminal device and the network device between the first terminal device and the second terminal device by transmitting the first channel information to the first terminal device. Moreover, the first terminal device sends the first precoding matrix to the second terminal device, so that the first precoding matrix can be shared between the first terminal device and the second terminal device.

In combination with the first method, in one possible implementation manner, when the first terminal device determines that the first signal is sent by using the codebook transmission manner, 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, where 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. 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.

With reference to the first aspect, in one possible implementation manner, 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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M. That is, the first terminal device may acquire a plurality of SRS resources for phase calibration between the first terminal device and other terminal devices according to the third indication information, and further the first terminal device may receive a plurality of different SRS on a plurality of time-frequency resources to perform phase calibration, thereby improving efficiency of phase calibration.

With reference to the first aspect, in one possible implementation manner, 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, wherein the capability information is used for indicating that the first terminal device has the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

In a second aspect, a phase calibration method is provided, which may be performed by a network device, or by a component of the network device, such as a processor, a chip, or a system-on-chip of the network device, or by a logic module or software that is capable of implementing all or part of the functions of the network device. The following description is made by taking this method as an example by the network device. The method comprises the following steps: the network equipment acquires the first indication information and sends the first indication information to the first terminal equipment. 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. In the embodiment of the present application, the first indication information indicates that the first SRS resource allocation 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 may receive the first SRS from the second terminal device, and measure the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device, and by using the phase difference information and/or frequency offset information, a phase difference caused by that a phase change and/or a frequency offset change between the first terminal device and the second terminal device are inconsistent when the first terminal device and the second terminal device send the first signal at the same time can be compensated, so that coherence between signals transmitted by aggregation of the first terminal device and the second terminal device can be improved, and power gain of the multi-channel signal co-directional superposition can be improved. Therefore, based on the phase calibration method provided by the embodiment of the application, the coherence of the multi-channel signal transmitted in an aggregation manner can be improved when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent, so that the power gain of the co-directional superposition of the multi-channel signal can be improved.

With reference to the second aspect, in a possible implementation manner, the first indication information includes first SRS resource configuration information. The first SRS resource configuration information comprises a usage indication user, wherein the usage indication user indicates that the first SRS resource configuration information is used for receiving SRS by the first terminal equipment; 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. That is, the first indication information may be information in which a user is configured to be "received" in the first SRS resource configuration information, so that the first SRS resource configuration information may be implicitly indicated for phase calibration between the first terminal device and the other terminal devices. Moreover, since the SRS resource configuration information itself is used for the terminal device to transmit the SRS, in the case where the SRS resource configuration information is used for phase calibration, it may be implicitly indicated that the SRS resource configuration information is used for the terminal device to receive the SRS.

With reference to the second aspect, in one possible implementation manner, the first indication information includes first SRS resource configuration information, and a symbol type corresponding to time domain resource information included in the first SRS resource configuration information is a downlink symbol. That is, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, the first SRS resource configuration information may be indicated to be used for receiving the SRS. That is, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, the first SRS resource configuration information may be indicated to be used for receiving the SRS, and further, the first SRS resource configuration information is implicitly indicated to be used for phase calibration between the first terminal device and other terminal devices.

With reference to the second aspect, in one possible implementation manner, the method further includes: the network device sends second indication information to the first terminal device, wherein the second indication information is used for indicating the first terminal device to send a first precoding matrix to the second terminal device, the first precoding matrix determines a precoding matrix corresponding to a first moment when the first terminal device sends a first signal by using a non-codebook transmission mode, and the first moment is the moment when the first terminal device receives a channel state information reference signal (CSI-RS) from the network device. That is, the network device may also be the first terminal device transmitting the first precoding matrix to the second terminal device such that the first precoding matrix may be shared between the first terminal device and the second terminal device.

With reference to the second aspect, in one possible implementation manner, the network device obtains the first indication information may include: the network device receives capability information from the first terminal device, wherein the capability information is used for indicating that the first terminal device has the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

With reference to the second aspect, in one possible implementation manner, the third indication information is sent to the first terminal device at 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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M. That is, the network device may provide the first terminal device with a plurality of SRS resources for phase calibration between the first terminal device and other terminal devices through the third indication information, and further the first terminal device may receive a plurality of different SRS on a plurality of time-frequency resources to perform phase calibration, thereby improving efficiency of phase calibration.

In a third aspect, a communication device is provided for implementing the above methods. The communication means may be the first terminal device of the first aspect, or a device comprising the first terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device. The communication device comprises corresponding modules, units or means (means) for realizing the method, and the modules, units or means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

In some possible designs, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be referred to as a transceiver unit, is configured to implement the transmitting and/or receiving functions of any of the above aspects and any possible implementation thereof. The transceiver module may be formed by a transceiver circuit, transceiver or communication interface. The processing module may be configured to implement the processing functions of any of the aspects described above and any possible implementation thereof.

The transceiver module is configured to receive first indication information from a network device, where the first indication information is used to indicate that first sounding reference signal SRS resource configuration information received by a first terminal device is used for phase calibration between the first terminal device and other terminal devices; the receiving and transmitting module is further configured to receive, according to the first indication information, a first SRS from the second terminal device on a time-frequency resource indicated by the first SRS resource allocation information; and the processing module is used for measuring the first SRS 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 the frequency offset information are used for compensating the phase difference and/or the frequency offset corresponding to the first signal transmitted by the first terminal equipment and the second terminal equipment.

The phase difference and/or the frequency offset corresponding to the first signal transmitted by the first terminal device and the second signal transmitted by the second terminal device include a difference between a first phase difference and a second phase difference, where the first phase difference is a phase difference between the first terminal device and the second terminal device at a first time, and the second phase difference is a phase difference between the first terminal device and the second terminal device at a second time. The first time is the time of measuring the Channel State Information (CSI) determined by the first terminal equipment, and the second time is the time of transmitting the first signal to the network equipment by the first terminal equipment.

Illustratively, the frequency offset corresponding to when the first terminal device and the second terminal device transmit the first signal includes a difference between the first frequency offset and the second frequency offset. The first frequency offset is the frequency offset of the first terminal equipment and the second terminal equipment at a first moment, and the second frequency offset is the frequency offset of the first terminal equipment and the second terminal equipment at a second moment. The first time is the CSI measurement time determined by the first terminal equipment, and the second time is the time when the first terminal equipment sends the first signal to the network equipment.

Illustratively, the first indication information includes first SRS resource configuration information including a usage indication usage. The user indicates that the first SRS resource configuration information is used for the first terminal equipment 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.

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

In an exemplary embodiment, in a case where the first terminal device determines to transmit the first signal using the non-codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device receives the channel state information reference signal CSI-RS from the network device.

The transceiver module is further configured to receive second indication information from the network device, where the second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device, and the first precoding matrix determines, for the first terminal device, a precoding matrix corresponding to a first time when the first signal is sent by using a non-codebook transmission mode; the receiving and transmitting module is further used for receiving first channel information from the second terminal equipment, wherein the first channel information comprises a channel matrix obtained by the second terminal equipment for measuring the CSI-RS; the processing module is further used for determining a first precoding matrix according to the first channel information and second channel information obtained by measuring the CSI-RS by the first terminal equipment; and the receiving and transmitting module is also used for transmitting the first precoding matrix to the second terminal equipment.

In an exemplary embodiment, when the first terminal device determines that the first signal is transmitted by using the codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device transmits a second SRS to the network device, where 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. 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.

The transceiver module is further configured to send capability information to the network device before receiving the first indication information from the network device, where the capability information is used to indicate that the first terminal device has a capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M.

Optionally, the transceiver module of the third aspect may include a receiving module and a transmitting module. The specific implementation manner of the transceiver module is not specifically limited in the present application.

Optionally, the communication device according to the third aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by a processing module, enable the communication device of the third aspect to perform the method of the first aspect.

In addition, the technical effects of the communication device according to the third aspect may refer to the technical effects of the communication method according to any possible implementation manner of the first aspect, which are not described herein.

In a fourth aspect, there is provided a communication device for performing the method of the second aspect or any of the possible implementations of the second aspect. The communication means may be a network device as in the second aspect, or an apparatus comprising the network device, or an apparatus, such as a chip, comprised in the network device. The communication device comprises corresponding modules, units or means (means) for realizing the method, and the modules, units or means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

With reference to the fourth aspect, in a possible implementation manner, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be referred to as a transceiver unit, is configured to implement the transmitting and/or receiving functions of the second aspect and any possible implementation thereof. The transceiver module may be formed by a transceiver circuit, transceiver or communication interface. The processing module may be adapted to implement the processing functions of the second aspect and any possible implementation thereof.

The processing module is configured to obtain first indication information, where the first indication information indicates that 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; and the receiving and transmitting module is used for transmitting the first indication information to the first terminal equipment.

The transceiver module is further configured to send second indication information to the first terminal device, where the second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device, where the first precoding matrix determines, for the first terminal device, a precoding matrix corresponding to a first time when the first terminal device receives the channel state information reference signal CSI-RS from the network device when the first terminal device uses the non-codebook transmission mode to send the first signal.

Exemplary, the processing module is configured to obtain the first indication information includes: receiving capability information from the first terminal equipment through the transceiver module, wherein the capability information is used for indicating that the first terminal equipment has the capability of acquiring phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment; first indication information is determined based on the capability information.

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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M.

Optionally, the transceiver module of the fourth aspect may include a receiving module and a transmitting module. The specific implementation manner of the transceiver module is not specifically limited in the present application.

Optionally, the communication device according to the fourth aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by a processing module, enable the communications device of the fourth aspect to perform the method of the second aspect.

In addition, the technical effects of the communication device according to the fourth aspect may refer to the technical effects of the communication method according to any one of the possible implementation manners of the second aspect, which are not described herein.

In some possible designs, the transceiver module includes a transmitting module and a receiving module for implementing the transmitting and receiving functions in any of the above aspects and any possible implementation thereof, respectively.

In a fifth aspect, there is provided a communication apparatus comprising: a processor and a memory; the memory is configured to store computer instructions that, when executed by the processor, cause the communication device to perform the method of any of the above aspects. The communication means may be the first terminal device of the first aspect, or a device comprising the first terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device.

In a sixth aspect, there is provided a communication apparatus comprising: a processor and a communication interface; the communication interface is used for communicating with a module outside the communication device; the processor is configured to execute a computer program or instructions to cause the communication device to perform the method of any of the above aspects. The communication means may be the first terminal device of the first aspect, or a device comprising the first terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device.

In a seventh aspect, there is provided a communication apparatus comprising: at least one processor; the processor is configured to execute a computer program or instructions stored in the memory to cause the communication device to perform the method of any of the above aspects. The memory may be coupled to the processor or may be separate from the processor. The communication means may be the first terminal device of the first aspect, or a device comprising the first terminal device, such as a chip; alternatively, the communication means may be the network device of the second aspect, or an apparatus comprising the network device, or an apparatus, such as a chip, comprised in the network device.

In an eighth aspect, there is provided a computer readable storage medium having stored therein a computer program or instructions which, when run on a communication device, enable the communication device to perform the method of any one of the above aspects.

In a ninth aspect, there is provided a computer program product comprising instructions which, when run on a communications apparatus, cause the communications apparatus to perform the method of any of the above aspects.

In a tenth aspect, there is provided a communications device (e.g. which may be a chip or a system of chips) comprising a processor for carrying out the functions referred to in any of the above aspects.

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

In some possible designs, the device may be a system-on-chip, may be formed from a chip, or may include a chip and other discrete devices.

It will be appreciated that when the communication apparatus provided in any one of the third to tenth aspects is a chip, the above-described transmitting action/function may be understood as output, and the above-described receiving action/function may be understood as input.

The technical effects caused by any one of the third aspect to the tenth aspect may be referred to the technical effects caused by the different design manners in the first aspect or the second aspect, and will not be described herein.

An eleventh aspect provides a communication system comprising the first terminal device of the above aspect and the network device of the above aspect.

Drawings

Fig. 1 is a schematic diagram of a MIMO system channel model according to an embodiment of the present application;

Fig. 2 is a schematic flow chart of transmitting an uplink signal based on codebook transmission according to an embodiment of the present application;

fig. 3 is a schematic diagram of a non-codebook transmission procedure according to an embodiment of the present application;

fig. 4 is a schematic diagram of a process for determining a precoding matrix according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

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

fig. 8 is a schematic structural diagram of a base station according to an embodiment of the present application;

fig. 9 is a schematic flow chart of a phase calibration method according to an embodiment of the present application;

fig. 10 is a schematic measurement timing diagram of aggregate transmission between a first terminal device and a second terminal device provided in an embodiment of the present application;

fig. 11 is a schematic flow chart of a phase calibration method according to the second embodiment of the present application;

fig. 12 is a schematic structural diagram of a first terminal device provided in an embodiment of the present application;

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

Detailed Description

For the convenience of understanding the technical solutions provided in the embodiments of the present application, a brief description of the related technology of the present application is first given. Briefly described as follows:

First, multiple input multiple output (multiple input multiple output, MIMO) technology

MIMO technology refers to a technology for transmitting and receiving signals using multiple antennas in the field of wireless communication. Among them, the network device and the terminal device can obtain a power gain, a spatial diversity (spatial diversity) gain, a spatial multiplexing (spatial multiplexing) gain, and the like using the MIMO technology. Spatial diversity may refer to introducing signal redundancy in space for diversity purposes. For example, the terminal device transmits two data streams orthogonal to each other through two antennas, thereby obtaining diversity gain. Spatial multiplexing may refer to transmitting multiple independent data streams on the same time-frequency resource at each antenna for the purpose of improving spectral efficiency without increasing spectral resources. For example, the terminal device may map (layer map) an uplink data layer into two independent data streams and send the two independent data streams simultaneously through multiple antennas, so that the spatial resources on the same time-frequency resource may be multiplexed.

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 is generally described herein, and will not be described in detail.

Second, antenna port (antenna port)

An antenna port defines a channel on a certain symbol. The antenna port is a logical concept, and one antenna port may correspond to one transmitting antenna or may correspond to multiple antennas. The antenna ports may be distinguished by Reference Signals (RSs) (also referred to as pilots): in the downlink (the link where the network device sends signals to the terminal device), the downlink and the downlink reference signals are in one-to-one correspondence; in the uplink, uplink and uplink reference signals are in one-to-one correspondence, and if one reference signal is transmitted through multiple antennas, the multiple antennas correspond to the same antenna port; if two different reference signals are transmitted through the same antenna, the antenna corresponds to two independent antenna ports.

For example, an antenna port corresponding to the demodulation reference signal (de-modulation reference signal, DMRS) may be referred to as a DMRS port, an antenna port corresponding to the downlink channel state information reference signal (channel state information reference signal, CSI-RS) may be referred to as a CSI-RS port, and an antenna port corresponding to the uplink sounding reference signal (sounding reference signal, SRS) may be referred to as an SRS port. The CSI-RS is used for channel state information (channel state information, CSI) measurement of the downlink channel, and the SRS is used for CSI measurement of the uplink channel.

Alternatively, in the embodiment of the present application, the channel experienced by the signal sent through the antenna port may be estimated by the reference signal corresponding to the antenna port. Wherein table one exemplarily shows a correspondence between a part of reference signals and antenna port index values in a New Radio (NR) system. It is to be understood that the antenna port index values in table one are merely exemplary, and may be other index values, which are not particularly limited in this embodiment of the present application.

List one

Referring to table one, PDSCH DMRS can support 12 antenna ports in an NR system. The number of layers of PDSCH transmitted by the network device is the same as the number of ports of PDSCH DMRS. That is, the network device supports transmission of up to 12 PDSCH DMRS symbol streams.

Optionally, in the embodiment of the present application, PDSCH is mainly used for downlink data transmission, and may also be used for 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 allocation information is used for receiving the CSI-RS from the network equipment by the terminal equipment, and the SRS resource allocation information is used for sending the SRS to the network equipment by the terminal equipment.

Referring again to table one, in an NR system, PDCCH DMRS can support 1 antenna port. The PDCCH is used for transmitting downlink control information (downlink control information, DCI). The DCI includes scheduling information of PDSCH received by the terminal device and uplink scheduling grant information obtained by SRS measurement by the network device. For example, the uplink scheduling grant information may include a PUSCH resource allocation, a transmission precoding matrix indicator (transmission precoding matrix indicator, TPMI), a number of layers transmitted, an SRS resource indicator (SRS resource indicator, SRI), or DMRS port indicator information, etc.

Optionally, in the embodiment of the present application, the TPMI is used in a transmission scheme in which the terminal device uses a codebook (codebook) transmission mode to send the uplink signal. Wherein the TPMI corresponds to one precoding matrix in the codebook set. The SRI is used in a transmission scheme in which the terminal device uses a non-codebook transmission mode to transmit an uplink signal. SRI may be associated with a non-quantized precoding matrix.

It should be understood that the related concepts of "codebook", "precoding matrix", "codebook transmission scheme", and "non-codebook transmission scheme" are specifically described in the following related term descriptions, which are not further described herein.

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

Referring again to table one, PUSCH DMRS and SRS may each support 4 antenna ports (including 1, 2, or 4). That is, the terminal device may support transmission of 4 independent SRS symbol streams or PUSCH DMRS symbol streams.

Fourth, channel matrix

Taking the MIMO system shown in fig. 1 as an example, as shown in fig. 1, the network device has Nt transmitting antennas, and the terminal device has Nr receiving antennas. Wherein, the transmission signal is X, and the reception signal is Y, the relationship shown in formula (1) can be satisfied between the reception signal Y and the transmission signal X.

Y=hx+n formula (1)

Wherein 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. Illustratively, the channel matrix H may be a matrix shown in equation (2).

H of the ith row and jth column of the channel matrix H as shown in formula (2) _ij The channel gain from the jth transmit antenna to the ith receive antenna may be represented.

Fifth, precoding matrix

In a wireless communication system, a transmission signal may be preprocessed according to channel information (e.g., channel matrix H) obtained by CSI measurement. By way of example, part or all of interference between the multiple independent symbol streams after layer mapping can be eliminated in advance at the network device, so as to realize link adaptation of data transmission, that is, different data transmission modes are adopted according to different channel conditions, and the interference between the symbol streams of the multiple layers of spatial multiplexing streams is reduced as much as possible. The matrix used in the precoding process when the network device or the terminal device sends the signal is the precoding matrix. In the case of neglecting the additive gaussian noise N, the relationship between the received signal Y and the transmitted signal X can be determined by the formula (3) after the network device adopts the precoding process.

Y= HVX formula (3)

In formula (3), matrix V is a precoding matrix. It will be appreciated that to cancel interference in the channel matrix H, V may be the inverse of H ^-1 . Since H is multiplied by V to form a unitary matrix, i.e., y=hh ^-1 X=x so that interference of the channel can be cancelled.

It can be understood that multiplying V on the right of the channel matrix H corresponds to multiplying V on the left of the data corresponding to the transmission signal X. In other words, precoding the channel matrix H can be achieved by precoding the data corresponding to the transmission signal X.

Alternatively, in the embodiment of the present application, in the case where the channel matrix H is irreversible, the precoding matrix V may be obtained by decomposing the channel matrix H and performing channel estimation. The channel matrix H may be decomposed by singular value decomposition (singular value decomposition, SVD), eigenvalue decomposition (eigen value decomposition, EVD), or other matrix decomposition, which is not specifically limited in the embodiment of the present application.

The process of obtaining the precoding matrix V by the channel matrix H is described below by taking SVD as an example.

5.1、SVD

In this embodiment of the present application, SVD decomposition is performed on the channel matrix H, so that equation (4) may be obtained.

H＝USV ^H Formula (4)

In formula (4), the matrix U is a unitary matrix of Nr×Nr elements, and the matrix V ^H The matrix S is a diagonal matrix of Nr×Nt elements. The column vector of the matrix U is the channel matrix H and the transposed matrix H thereof ^T Product HH of (2) ^T Is described. Matrix V ^H Is HH ^T Is described.

It should be understood that in the embodiment of the present application, the matrix S may not be a square matrix. Illustratively, the matrix S may be a matrix as shown in equation (5).

Optionally, in this embodiment of the present application, the number of elements with a value greater than or equal to the first threshold corresponding to the elements on the diagonal of the matrix S is the rank (rank) of the channel matrix H. Wherein the first threshold may be 0,0.1, or 0.2, etc.; alternatively, the first threshold may also be a condition number (condition number) corresponding to an S matrix for measuring the sensitivity of the matrix to a change, which is not specifically limited in the embodiment of the present application.

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, the number of layers is 1; if the rank of the channel matrix H is 2, the number of layers is 2, which is generally described herein, and will not be described in detail.

5.2 precoding

Since the product of the unitary matrix itself and its conjugate transpose matrix is an identity matrix, equation (3) can be expressed as equation (6) after the channel matrix H is right multiplied by the precoding matrix V.

Y＝USV ^H Vx=usx formula (6)

It will be appreciated that US in equation (6) indicates that the MIMO channel is not completely decomposed into a plurality of channels independent of each other, but the transmission process has been improved according to the actual channel. Wherein matrix V ^H Is the conjugate transpose of the precoding matrix. That is, by performing SVD decomposition on the signal matrix H, not only the rank of the channel matrix H but also V can be obtained ^H A precoding matrix V is obtained.

Alternatively, in the embodiment of the present application, the multiple symbol streams (symbol streams corresponding to DMRS ports) obtained through layer mapping may be transmitted by spreading the multiple symbol streams onto each antenna port (for example, CSI-RS port or SRS port) through precoding (i.e. multiplying the precoding matrix by the left). Illustratively, the description will be given with reference to the formula (7) taking the example that the number of antenna ports is 4, the number of layers is 2, and the number of symbols in each symbol stream is 1.

In equation (7), the matrix L is a matrix corresponding to a plurality of symbol streams. Wherein the number of row vectors of the 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 (i.e., the number of DMRS ports). The column vectors of the precoding matrix V are precoding vectors, each precoding vector corresponding to one symbol stream. After multiplying the precoding matrix V with the matrix L, each symbol stream (L ₁ Or l ₂ ) Is spread to each antenna port by a corresponding precoding vector (e.g., vector v ₁₁ l ₁ ,v ₂₁ l ₁ ,v ₃₁ l ₁ ,v ₄₁ l ₁ ] ^T Representing a symbol stream l ₁ Are spread over the individual antenna ports) and each antenna port carries the sum of a plurality of precoded symbol streams.

Optionally, in the embodiment of the present application, each element in the precoding vector may represent a weight of a symbol stream corresponding to the precoding vector sent by each antenna port. The signals sent by the antenna ports are linearly overlapped based on weights of symbol streams corresponding to the precoding vectors sent by the antenna ports represented by the elements in the precoding vectors, so that a region with stronger signals can be formed in a certain direction in space. That is, the precoding vector may indicate beam (beam) information of the transmitted symbol stream.

It should be appreciated that in the embodiments of the present application, the "precoding vector" may also be referred to as an "antenna weight vector", "angle vector", "digital beam (digital beam) vector", "spatial beam basis vector", or "spatial basis vector", etc. In other words, the "precoding vector", "antenna weight vector", "angle vector", "digital beam vector", "spatial beam basis vector", and "spatial basis vector" may be expressed interchangeably, and are described in detail herein, and will not be repeated herein.

In the embodiment of the present application, a beam may be understood as a spatial resource, and may refer to a transmission or reception precoding vector having energy transmission directivity. In addition, the transmitting or receiving precoding vector can be identified by index information, where the index information may correspond to a resource Identifier (ID) of the configured terminal device, for example, the index information may correspond to an identifier or a resource of the configured CSI-RS; or may be an identification or resource of the correspondingly configured SRS. Alternatively, the index information may also be index information that is displayed or implicitly carried through a signal or channel carried by the beam. The energy transmission directivity may mean that the signal to be transmitted is precoded by the precoding vector, the precoded signal has a certain spatial directivity, and the signal received by the precoding vector has better receiving power, for example, the signal to noise ratio of receiving demodulation is satisfied; the energy transmission directivity may also refer to the same signal transmitted from different spatial locations received with the precoding vector having different received powers. Alternatively, the same communication device (e.g., a terminal device or a network device) may have different precoding vectors, and different devices may also have different precoding vectors, i.e., corresponding to different beams. One communication device may use one or more of a plurality of different precoding vectors at the same time, i.e. may form one beam or multiple beams at the same time, for the configuration or capabilities of the communication device.

Sixth, codebook

A codebook is a set comprising a plurality of precoding matrices. Wherein the plurality of precoding matrices may be predefined. Codebooks may be divided into different types, such as type I (type I) codebooks and type II (type II) codebooks specified by the third generation partnership project (3rd generation partnership project,3GPP) in technical specification (technical specification, TS) 38.214. The type I codebook may be divided into a type I single-panel codebook and a type II multi-panel codebook, and the type II codebook may be divided into a type II single-panel codebook and a type II multi-panel codebook, and specific design and implementation of the codebook may refer to the description of the TS38.214, which is not repeated herein.

Seventh, NR system uplink transmission scheme

The terminal device can transmit the uplink signal through the MIMO technology, so as to obtain the multi-antenna processing gain. The uplink transmission scheme of the NR system includes a transmission scheme for transmitting an uplink signal using a codebook transmission scheme or a transmission scheme for transmitting an uplink signal using a non-codebook transmission scheme.

7.1 codebook Transmission

In the scheme based on codebook transmission, a precoding matrix used by the terminal equipment is taken from a fixed codebook. As shown in fig. 2, the process of transmitting an uplink signal by the NR system based on codebook transmission includes the following steps:

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

S202, the network equipment measures SRS from the terminal equipment to obtain uplink scheduling grant information, and sends the uplink scheduling grant information to the terminal equipment. Accordingly, the terminal device receives the uplink scheduling grant information from the network device. The uplink scheduling grant information may include information such as TPMI, the number of layers transmitted, or SRI.

And S203, the terminal equipment sends an uplink signal to the network equipment according to the uplink scheduling grant information. Accordingly, the network device receives the uplink signal from the terminal device.

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

For example, the uplink scheduling grant information is illustrated by using the network device as an example of configuring two SRS resources for the terminal device. The two SRS resources contain the same number of SRS ports. The network device selects an optimal uplink precoding matrix and the number of transmission layers by measuring channels corresponding to the two SRS resources (for example, performing SVD decomposition on SRS ports), and indicates the SRS resources corresponding to the selected precoding matrix to the terminal device through the SRI in the DCI.

Alternatively, in step S201, the terminal device may transmit SRS corresponding to the plurality of SRS resources with different beams (e.g., analog beams), respectively. Accordingly, the network device selects the SRS resource (e.g., the SRS resource selected by the SRI indication), i.e., corresponds to the selection of the uplink transmission beam. It may be appreciated that, in the case where 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 further, in step 202, the uplink scheduling grant information sent by the network device to the terminal device may not include the SRI.

Alternatively, in the embodiment of the present application, the uplink signal may be carried by the PUSCH. The DMRS of PUSCH and the data of PSUCH are precoded by using the same precoding matrix. For example, the terminal device may precode PUSCH data in the manner of formula (8).

See equation (8) [ y ] ⁰ (i),y ¹ (i),…,y ^v-1 (i)] ^T The matrix corresponding to the symbol of the PUSCH data, V represents the number of layers of transmission indicated by the network device (i.e., the number of layers of the PUSCH data), i represents the ith data symbol of the PUSCH data, and the precoding matrix V is the precoding matrix corresponding to the TPMI. Wherein, precoding matrix V and [ y ] ⁰ (i),y ¹ (i),…,y ^v-1 (i)] ^T Multiplication, i.e., precoding, of PUSCH data. Representation mapped to port p after precoding _n Data above, n=0, 1, … k-1.

It can be understood that the DMRS of PUSCH may also be precoded by adopting the precoding manner of equation (8), that is, precoding by adopting the same precoding matrix, and mapping the DMRS symbol stream after precoding to the same antenna port. If the SRS transmitted by the terminal device itself performs precoding (or analog beamforming), the terminal device performs precoding on the PUSCH and the DMRS of the PUSCH according to equation (8), and then further processes the DMRS according to the SRS precoding method.

7.2 non-codebook Transmission

The non-codebook transmission scheme differs from the codebook transmission scheme in that the precoding matrix of the non-codebook transmission scheme is no longer defined within a limited candidate set of the fixed codebook. Wherein the terminal device determines the uplink precoding matrix based on channel reciprocity, such as channel reciprocity of a time division duplex (time division duplex, TDD) system. If the reciprocity of the uplink and downlink channels exists, the terminal device can estimate the uplink channel by using a downlink reference signal (for example, CSI-RS), and acquire an uplink precoding matrix by adopting an SVD algorithm and the like on the estimated channel.

Taking the flow of transmitting an uplink signal based on codebook transmission as an example in the NR system shown in fig. 2, the NR system is different from transmitting an uplink signal based on non-codebook transmission in that:

(1) In step S201, the terminal device measures CSI-RS from the network device to obtain an uplink precoding matrix, and the terminal device precodes SRS according to a plurality of precoding vectors in the uplink precoding matrix, respectively. That is, the terminal device transmits the precoded SRS to the network device;

(2) In step S202, the uplink scheduling grant information does not include TPMI, and in step S203, the terminal device determines a precoding matrix for transmitting the uplink signal using the precoding matrix corresponding to the SRI in the uplink scheduling grant information.

The determination of the precoding matrix of the signal on transmission by the terminal equipment is illustrated by way of example with reference to the non-codebook transmission procedure schematic shown in fig. 3. As shown in fig. 3, it is assumed that an uplink precoding matrix obtained by a terminal device according to CSI-RS includes four precoding vectors, and a network device configures four SRS resources for the terminal device, and the terminal device may perform precoding on the four SRS resources respectively and then send the four SRS resources. Accordingly, the network device receives the SRS transmitted from the terminal device. The four SRS resources are in one-to-one correspondence with the four precoding vectors, for example, a precoding vector #0 corresponding to SRS resource #0, a precoding vector #1 corresponding to SRS resource #1, a precoding vector #2 corresponding to SRS resource #2, and a precoding vector #3 corresponding to SRS resource #3. If the network device measures the SRS transmitted by the terminal device and selects the SRS resource #0 and the SRS resource #1, the SRI in the uplink scheduling grant information transmitted by the network device indicates the SRS resource #0 and the SRS resource #1, and the terminal device may determine that the precoding matrix for transmitting the uplink signal includes the precoding vector #0 and the precoding vector #1 according to the SRS indication.

The contents included in the SRS resource configuration information are described below by taking an NR system as an example.

In the NR system, an SRS resource set (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. Wherein one SRS resource set may include one or more SRS resources. An SRS resource may include one or more of the following:

1. usage indication (usage): in the NR system, the usage indication may be configured as "beam management", "codebook", "non-codebook", or "antenna switching"; the method comprises the steps that beam management is used for uplink beam management, a codebook is used for uplink channel information acquisition of a codebook transmission scheme, a non-codebook is used for uplink channel information acquisition of a non-codebook transmission scheme, and antenna switching is used for downlink channel information acquisition based on SRS antenna switching;

2. number of antenna ports: in an NR system, one SRS resource can be configured with 1, 2 or 4 antenna ports;

3. time domain position: in an NR system, the time domain position includes an index, a start position, and the like of an occupied orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol. Wherein, the OFDM symbol index may indicate the number of OFDM symbols occupied by SRS resources, one SRS resource may configure 1, 2, 4, 8 or 12 OFDM symbols, and the starting position may be given by a field startPosition;

4. Resource type: in an NR system, SRS resources can be classified into periodic (periodic), semi-persistent (semi-persistent), or aperiodic (aperiodic) types; for semi-persistent or periodic SRS resources, one SRS resource may include a period designated for the terminal device and a slot offset index (slot offset);

5. occupied resource element (RB) index: in an NR system, one SRS resource may occupy 4-272 RBs.

Eighth, multi-terminal device cooperative transmission

Multi-terminal device cooperative transmission is a communication technology focusing on cooperative transmission by a plurality of terminal devices in a group of terminal devices. The multi-terminal device cooperative transmission can be used for improving the throughput of a system, expanding the coverage range and increasing the capacity, and can also improve the communication reliability and reduce the communication delay. The multi-terminal device cooperative transmission may facilitate V2X and other scenarios such as enhanced mobile broadband (enhanced mobile broadband, eMBB) and ultra-high reliability ultra-low latency communication (URLLC).

Optionally, in the embodiment of the present application, a plurality of terminal devices in a group of terminal devices may interact with each other through a Side Link (SL) technology and/or a near field communication technology (such as bluetooth, wireless fidelity (wireless fidelity, wi-Fi), or near field communication (near field communication, NFC). Wherein the group of terminal devices may be divided into source user devices (source user equipment, SUE) and the other terminal devices may be referred to as cooperating user devices (cooperative user equipment, CUE). For example, the SUE may send the collaboration data to be sent and the sending time to one or more CUEs through SL, and then the SUE and the one or more CUEs may send the collaboration data at the same time, so as to implement collaboration transmission.

It should be understood that in the embodiment of the present application, the collaboration data that are sent by the SUE and the CUE simultaneously may be the same; alternatively, when the SUE and the CUE cooperatively transmit, the same Transport Block (TB) is transmitted. In NR, the uplink transmission may be data transmission in a basic unit of TB, where the TB may refer to data before encoding, that is, original data to be transmitted by each terminal device.

It can be understood that, in the embodiments of the present application, the meanings of "cooperative transmission", "aggregate transmission", and "joint transmission" are the same, and may be expressed interchangeably, and are described in detail herein, and are not described in detail herein.

8.1 coherent addition

The coherent superposition may refer to the homodromous superposition of multiple signals, and increase the power of a signal received by equipment, so as to obtain a power gain. The strong coherence indicates that the signal power of the multipath signals after superposition is strong, and the weak coherence indicates that the signal power of the multipath signals after superposition is weak.

8.1.1 phase differences

The phase difference may refer to a phase difference value between signals transmitted by the terminal device. In other words, the phase difference in the embodiment of the present application may refer to a phase difference value between terminal devices. Wherein the phase difference can be used to represent the strength of the coherence. Illustratively, taking the example of terminal device #1 transmitting signal #1 and terminal device #2 transmitting signal #2, strong coherence means that the phase difference between signal #1 and signal #2 is located near an integer multiple of 2π. For example, the difference between the signal #1 and the signal #2 minus an integer multiple of 2pi is within a first range, which may be [ -10 °,10 ° ], 20 ° ], or (-40 °,40 ° ], or the like, to which the embodiment of the present application is not particularly limited. It can be understood that the closer the phase difference between the signal #1 and the signal #2 is to an integer multiple of 2pi, the stronger the coherence between the signal #1 and the signal #2 is, in the case where the phase difference between the signal #1 and the signal #2 is an integer multiple of 2pi, the stronger the coherence between the signal #1 and the signal #2 is, and the power gain obtained after the signal #1 and the signal #2 are superimposed in the same direction is the largest.

Accordingly, weak coherence means that the phase difference between the signal #1 and the signal #2 is located near an odd multiple of pi, such as the difference between the phase difference between the signal #1 and the signal #2 minus an integer multiple of 2pi is located outside the first range. It will be appreciated that the closer the phase difference between the signal #1 and the signal #2 is to an odd multiple of pi, the weaker the coherence between the signal #1 and the signal #2 is, and in the case where the phase difference between the signal #1 and the signal #2 is an odd multiple of pi, the coherence between the signal #1 and the signal #2 is the weakest, and the signal #1 and the signal #2 are mutually offset after being superimposed in the same direction, so that not only is the power gain not obtained, but also the power after the signal #1 and the signal #2 are superimposed is reduced.

8.1.2 frequency offset

The frequency offset may refer to a difference in frequency between signals transmitted by the terminal device. In other words, the frequency offset in the embodiments of the present application may refer to a difference in frequency between terminal devices. Where the frequency offset causes a phase difference between the two signals, which is the accumulation of the frequency offset over time. That is, the phase difference between the two signals includes a phase difference caused by 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 includes not only the phase difference caused by the frequency offset between the terminal devices, but also the phase difference caused by other factors (such as random initial phase, channel delay, and non-ideal factors such as synchronization error). Wherein the precoding matrix may change a state (e.g., amplitude, frequency, phase, etc.) of the signal in combination with the above description regarding the precoding matrix, and thus the phase difference and/or frequency offset between the terminal devices may be compensated for by 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, the precoding matrix only compensates for the frequency offset between the terminal devices, but does not compensate for the phase difference between the terminal devices.

It can be appreciated that in the embodiment of the present application, the terminal device may compensate the frequency offset by compensating the phase difference caused by the frequency offset between the terminal devices through the precoding matrix.

8.2 Power consistency

The 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. Wherein, the first threshold may be 1dB, 2dB, or 3dB, which is not particularly limited in the embodiments of the present application.

8.3 phase continuity

Phase continuity may refer to the amount of phase change of the terminal device transmit signal at different times being less than or equal to the second threshold. Wherein, the second threshold value may be 10 °, 20 °, or 40 °, which is not particularly limited in the embodiments of the present application.

Optionally, in the embodiment of the present application, the first threshold value and the second threshold value may be preconfigured by the terminal device; alternatively, the first threshold and the second threshold may be protocol-contracted; alternatively, the first threshold and the second threshold may be indicated by the network device, which is not specifically limited in the embodiments of the present application.

Alternatively, in the embodiment of the present application, the aggregate transmission may be divided into incoherent joint transmission (non-coherent joint transmission, NCJT) and coherent joint transmission (coherent joint transmission, cqt) according to whether to compensate for phase differences and/or frequency offsets between signals transmitted by a plurality of terminal devices during uplink transmission, and NCJT and cqt are described below, respectively.

8.4、NCJT

NCJT may refer to the effect that in aggregate transmissions, the signals sent by each terminal device do not need to be coherently superimposed (i.e., co-directionally superimposed) when arriving at the network device. In the NCJT, the network device determines a precoding matrix corresponding to each terminal device according to CSI obtained by CSI measurement of each terminal device. That is, in NCJT, the precoding matrix determined by the network device is determined according to CSI information of the terminal device itself, CSI information of other terminal devices is not considered, and thus the precoding matrix determined by the network device does not compensate for a phase difference between the terminal devices.

Illustratively, the precoding matrix determined by the NCJT does not compensate for the phase difference between the terminal equipments, taking the aggregate transmission of the two terminal equipments (terminal equipment #1 and terminal equipment # 2) shown in fig. 4 as an example. As shown in fig. 4, CSI measurement is performed between the network device and the terminal device #1, so as to obtain CSI of the terminal device #1 at the CSI measurement time, and then the network device determines a precoding matrix #1 according to the CSI, and indicates the precoding matrix #1 to the terminal device #1. Likewise, CSI measurement is performed between the network device and the terminal device #2 to obtain a precoding matrix #2 corresponding to the terminal device #2, and the precoding matrix #2 is indicated to the terminal device #2. Wherein, for NCJT, since the precoding matrices are determined independently, it is not necessary to ensure that the phases between terminal device #1 and terminal device #2 are aligned, i.e., the precoding matrix #1 and precoding matrix #2 do not compensate for the phase difference between terminal device #1 and terminal device #2.

It should be understood that in the embodiment of the present application, in the NCJT, the data before or after channel coding transmitted by each terminal device may be different; or, each terminal device transmits a different transport block TB; alternatively, each terminal device transmits the same TB, but the redundancy versions (redundancy version, RV) transmitted by each terminal device may not be the same. In NR, the TB includes basic data and multiple pieces of redundant data after channel coding, where the basic data and multiple pieces of redundant data are sequentially stored in a buffer, and RV is used to indicate a position where a terminal device reads data in the buffer, that is, RV may be used to indicate coded data to be transmitted by each terminal device.

8.5、CJT

Cqt may refer to the effect that in aggregate transmission, the signals sent by each terminal device need to be coherently superimposed (i.e. co-directionally superimposed) when reaching the network device. In the cqt, the network device jointly determines a precoding matrix corresponding to each terminal device according to CSI obtained by CSI measurement of each terminal device. That is, the precoding matrix determined in the CJT is a precoding matrix comprehensively determined after combining CSI information of each terminal equipment, and thus compensates for phase differences between the plurality of terminal equipments.

Illustratively, the precoding matrix determined by cqt is described with reference to the aggregate transmissions of two terminal equipments (terminal equipment #1 and terminal equipment # 2) to compensate for the phase difference between the terminal equipments. 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 according to the channel matrix #1 of the terminal device #1 and the channel matrix #2 of the terminal device #2, and indicate the precoding matrix #3 to the terminal device #1 and the precoding matrix #4 to the terminal device #2, so as to ensure coherence between the signal sent by the terminal device #1 and the signal sent by the terminal device #2, so as to improve the power gain of the co-directional superposition of multiple signals.

It should be understood that in the above example, the channel matrix #1 is obtained by CSI measurement of an uplink channel between the network device and the terminal device #1, and the channel matrix #2 is obtained by CSI measurement of an uplink channel between the network device and the terminal device # 2. The CSI measurement time corresponding to the channel matrix #1 is the same as the CSI measurement time corresponding to the channel matrix #2 or the difference between the two is smaller than the third threshold. The third threshold may be 0.2ms, 0.3ms, or 1ms, as embodiments of the present application are not specifically limited.

It may be appreciated that in the embodiment of the present application, CSI may include not only a channel matrix, but also interference information, i.e. the precoding matrix may be determined according to the channel matrix and/or the interference information, which is not specifically limited in the embodiment of the present application.

Alternatively, in the embodiment of the present application, the third threshold may be preconfigured; alternatively, it may be agreed that embodiments of the present application are not particularly limited.

Alternatively, in the embodiment of the present application, in cqt, the data before channel coding transmitted by each terminal device may be the same; alternatively, the TB transmitted by each terminal device is the same; alternatively, the RV of each terminal device is the same. That is, in cqt, the cooperative data transmitted by each terminal device may be the same.

At present, through CJT aggregation transmission, signals sent by each terminal device in a plurality of terminal devices can be aggregated together to perform data transmission, and when the signals reach network devices, multipath signals of the aggregation transmission form homodromous superposition to obtain power gain, so that the effect of improving uplink transmission rate is achieved.

However, the phase and/or frequency offset of the terminal equipment at different moments is changed, and even if the phase difference and/or frequency offset between multiple paths of signals at the CSI measurement moment is compensated through a precoding matrix in the aggregation transmission process of multiple terminal equipment, when the phase change and/or frequency offset change between multiple paths of signals are inconsistent, the phase difference and/or frequency offset between multiple paths of signals at the transmission moment cannot meet the coherence requirement of co-directional superposition, which can cause that the multiple terminal equipment cannot obtain power gain in the aggregation transmission process.

In view of this, the embodiments of the present application provide a phase calibration method, which can improve coherence of multiple signals transmitted in an aggregate when phase changes and/or frequency offset changes are inconsistent among a plurality of terminal devices, so as to improve power gain of co-stacking of the multiple signals.

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. Wherein, in the description of the present application, "/" means that the related objects are in a "or" relationship, unless otherwise specified, for example, a/B may mean a or B; the term "and/or" in this application is merely an association relation describing an association object, and means that three kinds of relations may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. Also, in the description of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", and the like are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not 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 fashion that may be readily understood.

In the embodiment of the application, the "indication" may include a direct indication and an indirect indication, and may also include an explicit indication and an implicit indication. The information indicated by a certain information (for example, the first sounding reference signal SRS resource configuration information received by the first terminal device is indicated to be used by the first terminal device to receive the SRS) is called to-be-indicated information, and in a specific implementation process, there are various ways to indicate to-be-indicated information, for example, but not limited to, the to-be-indicated information may be directly indicated, for example, the to-be-indicated information itself or an index of the to-be-indicated information, etc. The information to be indicated can also be indicated indirectly by indicating other information, wherein the other information and the information to be indicated have an association relation. 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 the specific information may also be achieved by means of a pre-agreed (e.g., protocol-specified) arrangement sequence of the respective information, thereby reducing the indication overhead to some extent.

The technical scheme of the embodiment of the application can be applied to various communication systems. For example: orthogonal frequency division multiple access (orthogonal frequency-division multiple access, OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems, among others. The term "system" may be used interchangeably with "network". OFDMA systems may implement wireless technologies such as evolved universal wireless terrestrial access (evolved universal terrestrial radio access, E-UTRA), ultra mobile broadband (ultra mobile broadband, UMB), and the like. E-UTRA is an evolved version of the universal mobile telecommunications system (universal mobile telecommunications system, UMTS). Various versions of 3GPP in long term evolution (long term evolution, LTE) and LTE-based evolution are new versions using E-UTRA. The 5G communication system is the next generation communication system under study. The 5G communication system includes a non-independent Networking (NSA) 5G mobile communication system, an independent networking (SA) 5G mobile communication system, or an NSA 5G mobile communication system and an SA 5G mobile communication system. In addition, the communication system can be also suitable for future communication technologies, and the technical scheme provided by the embodiment of the application is applicable. The above-mentioned communication system to which the present application is applied is merely illustrative, and the communication system to which the present application is applied is not limited thereto, and is generally described herein, and will not be described in detail.

In addition, the communication architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and as a person of ordinary skill in the art can know, with evolution of the communication architecture and appearance of a new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

As shown in fig. 5, a communication system according to an embodiment of the present application is provided, where the communication system includes one or more network devices 50 (fig. 5 illustrates that the communication system includes one network device 50 as an example), and a plurality of terminal devices 60 connected to each network device 50. Wherein transmissions may be aggregated among a plurality of terminal devices 60.

In a possible implementation manner, the network device obtains first indication information, and sends the first indication information to the first terminal device, where the first indication information indicates that 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. Correspondingly, the first terminal equipment receives first indication information from the network equipment, receives the first SRS from the second terminal equipment 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 phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment. The phase difference information and/or the frequency offset information are used for compensating the phase difference and/or the frequency offset corresponding to the first signal transmitted by the first terminal equipment and the second terminal equipment.

Specific implementations of the above schemes will be described in detail in the following embodiments, which are not described herein.

In the embodiment of the present application, the first indication information indicates that the first SRS resource allocation 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 may receive the first SRS from the second terminal device, and measure the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device, and by using the phase difference information and/or frequency offset information, a phase difference caused by that a phase change and/or a frequency offset change between the first terminal device and the second terminal device are inconsistent when the first terminal device and the second terminal device send the first signal at the same time can be compensated, so that coherence between signals transmitted by aggregation of the first terminal device and the second terminal device can be improved, and power gain of the multi-channel signal co-directional superposition can be improved. Therefore, based on the phase calibration method provided by the embodiment of the application, the coherence of the multi-channel signal transmitted in an aggregation manner can be improved when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent, so that the power gain of the co-directional superposition of the multi-channel signal can be improved.

Alternatively, the terminal device 60 in the embodiment of the present application may be a device for implementing a wireless communication function, such as a terminal or a chip or the like that may be used in the terminal. The terminal may be a User Equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a terminal agent, a terminal apparatus, or the like in a 5G network or a future evolved public land mobile network (public land mobile network, PLMN). An access terminal may be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, vehicle-mounted device or wearable device, virtual Reality (VR) terminal device, augmented reality (augmented reality, AR) terminal device, wireless terminal in industrial control (industrial control), wireless terminal in self-driving (self-driving), wireless terminal in telemedicine (remote medium), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), etc. Alternatively, the terminal device may be mobile or fixed.

Alternatively, 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 reception point (transmission and reception point, TRP), a base station, a remote radio unit (remote radio unit, RRU) or baseband unit (BBU) of a separate base station, which may also be referred to as a Digital Unit (DU), a broadband network service gateway (broadband network gateway, BNG), an aggregation switch, a non-3 GPP access device, a relay station, or an access point, etc. In fig. 5, a network device is taken as an example of a base station, which is generally described herein, and will not be described in detail. In addition, the base station in the embodiment of the present application may be a base transceiver station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communication, GSM) or code division multiple access (code division multiple access, CDMA) network, an NB (NodeB) in wideband code division multiple access (wideband code division multiple access, WCDMA), an eNB or eNodeB (evolutional NodeB) in LTE, a radio controller in a cloud radio access network (cloud radio access network, CRAN) scenario, a base station in a 5G communication system, or a base station in a future evolution network, etc., which is not particularly limited herein.

Alternatively, in the 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. Further, the network device 50 and the terminal device 60 may support single-user MIMO (SU-MIMO) technology, and may support multi-user MIMO (MU-MIMO). Among other things, MU-MIMO technology may be implemented based on spatial division multiple access (space division Multiple access, SDMA) technology. Because of the multiple antennas configured, network device 50 and terminal device 60 may also flexibly support single-in single-out (Single Input Single Output, SISO) techniques, single-in multiple-out (Single Input Multiple Output, SIMO) and multiple-in single-out (Multiple Input Single Output, MISO) techniques to implement various diversity (e.g., without limitation, transmit diversity and receive diversity) and multiplexing techniques, which may include, without limitation, transmit diversity (transmit diversity, TD) techniques and receive diversity (receive diversity, RD) techniques, which may be spatial multiplexing (spatial multiplexing) techniques. And the various techniques described above may also include a variety of implementations, for example, transmit diversity techniques may include, but are not limited to: space-time transmit diversity (STTD), space-frequency transmit diversity (space-frequency transmit diversity, SFTD), time-switched transmit diversity (time switched transmit diversity, TSTD), frequency-switched transmit diversity (frequency switch transmit diversity, FSTD), orthogonal transmit diversity (orthogonal transmit diversity, OTD), cyclic delay diversity (cyclic delay diversity, CDD), and the like, and diversity obtained by deriving, evolving, and combining the above diversity methods. For example, currently, the LTE standard adopts a transmit diversity scheme such as space-time block coding (space time block coding, STBC), space-frequency block coding (space frequency block coding, SFBC), and CDD. The transmit diversity has been generally described above by way of example. It will be appreciated by those skilled in the art that transmit diversity includes a variety of other implementations in addition to the examples described above. Therefore, the above description should not be construed as limiting the technical solutions provided by the embodiments of the present application, which should be construed as being applicable to various possible transmit diversity schemes.

Optionally, the network device 50 and/or the terminal device 60 in the embodiments of the present application have a function of processing baseband signals, for example, may have one or more functions of coding (encoding), rate matching (rate matching), scrambling (scrambling), modulation (layer mapping); the upstream direction may have one or more of decoding (coding), rate de-matching (rate de-scrambling), de-scrambling (de-modulation), demodulation (de-modulation), channel estimation (channel estimation)/equalization (equalization).

Optionally, the network device 50 and/or the terminal device 60 in the embodiments of the present application have processing functions for processing intermediate frequency signals and/or radio frequency signals, and providing a part of baseband signals, for example, may have one or more functions of resource mapping (resource element mapping), digital beamforming (digital beam forming, DBF), inverse fast fourier transform (inverse fast fourier transformation, IFFT) and cyclic prefix addition (cyclic prefix addition), analog beamforming (analog beam forming, ABF), analog-to-digital conversion (analog to digital) in the downlink direction; the upstream direction may have one or more of fast fourier transform (fast fourier transformation, FFT) and band cyclic prefix removal (cyclic prefix removal), analog beamforming, analog-to-digital conversion, digital beamforming, resource demapping (resource element de-mapping).

Alternatively, the network device 50 and the terminal device 60 in the embodiments of the present application may also be referred to as a communication device, which may be a general-purpose device or a special-purpose device, which is not specifically limited in the embodiments of the present application.

Alternatively, the related functions of the terminal device 50 or the network device 60 in the embodiments of the present application may be implemented by one device, or may be implemented by multiple devices together, or may be implemented by one or more functional modules in one device, which is not specifically limited in the embodiments of the present application. It will be appreciated that the above described functionality may be either a network element in a hardware device, or a software functionality running on dedicated hardware, or a combination of hardware and software, or a virtualized functionality instantiated on a platform (e.g., a cloud platform).

For example, the related functions of the terminal device 60 or the network device 50 in the embodiment of the present application may be implemented by the communication apparatus 600 in fig. 6. Fig. 6 is a schematic structural diagram of a communication device 600 according to 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 (shown in fig. 6 as exemplary only including communication interface 604, and one processor 601, for example), and optionally memory 603.

The processor 601 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application.

The communication line 602 may include a passageway for connecting between the various components.

The communication interface 604, which may be a transceiver module, is used to communicate with other devices or communication networks, such as ethernet, RAN, wireless local area network (wireless local area networks, WLAN), etc. For example, the transceiver module may be a device such as a transceiver or a transceiver. Alternatively, the communication interface 604 may be a transceiver circuit located in the processor 601, so as to implement signal input and signal output of the processor.

The memory 603 may be a device having a memory function. For example, but not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via communication line 602. The memory may also be integrated with the processor.

The memory 603 is used for storing computer-executable instructions for executing the embodiments of the present application, and is controlled by the processor 601 to execute the instructions. The processor 601 is configured to execute computer-executable instructions stored in the memory 603, thereby implementing the phase calibration method provided in the embodiments of the present application.

Alternatively, in the embodiment of the present application, the processor 601 may perform the functions related to the processing of the phase calibration method provided in the embodiment described below, where the communication interface 604 is responsible for communicating with other devices or communication networks, and the embodiment of the present application is not limited in detail.

Optionally, the memory 603 in the embodiment of the present application may also be used to store information or parameters described in the following embodiments, for example, the first SRS resource configuration information, the first indication information, the codebook, and phase difference information and/or frequency offset information. The phase difference information and/or the frequency offset information comprise phase differences and/or frequency offsets among a plurality of terminal devices. Illustratively, taking an example in which the plurality of terminal devices includes a first terminal device and a second terminal device, the phase difference information and/or the frequency offset information includes a phase difference and/or a frequency offset between the first terminal device and the second terminal device. Taking an example in which the plurality of terminal devices includes a first terminal device, a second terminal device, and a third terminal device, the phase difference information includes a phase difference and/or a frequency offset between the first terminal device, the second terminal device, and the third terminal device.

Computer-executable instructions in embodiments of the present application may also be referred to as application code, which embodiments of the present application are not particularly limited.

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

In a particular implementation, as one embodiment, the communications apparatus 600 can include a plurality of processors, such as processor 601 and processor 608 in FIG. 6. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

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

The communication device 600 may be a general-purpose device or a special-purpose device. For example, the communication apparatus 600 may be a desktop computer, a portable computer, a web server, a palm-top computer (personal digital assistant, PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device having a similar structure as in fig. 6. The embodiments of the present application are not limited to the type of communication device 600.

In connection with the schematic structural diagram of the communication apparatus 600 shown in fig. 6, taking the communication apparatus 600 as the terminal device 60 in fig. 5 as an example, fig. 7 is a specific structural form of the terminal device 60 provided in the embodiment of the present application.

Wherein in some embodiments the functionality of processor 601 in fig. 6 may be implemented by processor 710 in fig. 7.

In some embodiments, the functionality of the communication interface 604 in fig. 6 may be implemented by the antenna 1, the antenna 2, the mobile communication module 750, the wireless communication module 760, etc. in fig. 7.

Wherein the antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in terminal device 60 may be configured to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 750 may provide a solution including 2G/3G/4G/5G wireless communication applied on the terminal device 60. The mobile communication module 750 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 750 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 750 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 750 may be disposed in the processor 710. In some embodiments, at least some of the functional modules of the mobile communication module 750 may be disposed in the same device as at least some of the modules of the processor 710.

The wireless communication module 760 may be one or more devices that integrate 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 transmits the processed signals to the processor 710. The wireless communication module 760 may also receive signals to be transmitted from the processor 710, frequency modulate them, amplify them, and convert them to electromagnetic waves for radiation via the antenna 2.

In some embodiments, antenna 1 and mobile communication module 750 of terminal device 60 are coupled, and antenna 2 and wireless communication module 760 are coupled, such that terminal device 60 may communicate with a network and other devices via wireless communication techniques.

In some embodiments, the functionality of memory 603 in fig. 6 may be implemented by an external memory (e.g., micro SD card) connected by internal memory 721 or external memory interface 720 in fig. 7, or the like.

In some embodiments, the functionality of the output device 605 in fig. 6 may be implemented through the display 794 in fig. 7. The display 794 includes a display panel.

In some embodiments, the functionality of the input device 606 in FIG. 6 may be implemented by a mouse, a keyboard, a touch screen device, or the sensor module 780 in FIG. 7. In some embodiments, as shown in fig. 7, the terminal device 60 may further include one or more of an audio module 770, a camera 793, an indicator 792, a motor 791, keys 790, a SIM card interface 795, a USB interface 730, a charge management module 740, a power management module 741, and a battery 742, which is not particularly limited in this embodiment.

It will be appreciated 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, terminal device 60 may include more or fewer components than shown, or certain components may be combined, certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Alternatively, in connection with the schematic structural diagram of the communication apparatus 600 shown in fig. 6, taking the communication apparatus 600 as the network device 50 in fig. 5, the network device 50 is exemplified as a base station, and fig. 8 is an exemplary structural form of the base station 80 according to the embodiment of the present application.

Wherein the base station 80 includes one or more radio frequency units (e.g., RRU 801), and one or more BBUs 802.

RRU801 may be referred to as a transceiver unit, transceiver circuitry, or transceiver, etc., which may include at least one antenna feed system (i.e., antenna) 811 and a radio frequency unit 812. The RRU801 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals. In some embodiments, the functionality of the communication interface 604 in fig. 6 may be implemented by the RRU801 in fig. 8.

The BBU802 is a control center of a network device, and may also be referred to as a processing unit, and is mainly configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on.

In some embodiments, the BBU802 may be formed by one or more single boards, where the multiple single boards may support a single access indicated radio access network (such as an LTE network), or may support radio access networks of different access schemes (such as an LTE network, a 5G network, or other networks). The BBU802 also includes a memory 821 and a processor 822, the memory 821 for storing necessary instructions and data. The processor 822 is configured to control the network device to perform the necessary actions. The memory 821 and processor 822 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits. In some embodiments, the functions of the processor 601 in fig. 6 may be implemented by the processor 822 in fig. 8, and the functions of the memory 603 in fig. 6 may be implemented by the memory 821 in fig. 8.

Alternatively, the RRU801 and the BBU802 in fig. 8 may be physically disposed together or may be physically disposed separately, for example, a distributed base station, which is not specifically limited in the embodiment of the present application.

Optionally, the network device 50 in embodiments 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.

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

Next, a description will be given of a phase calibration method provided in the embodiment of the present application with reference to fig. 9.

It should be understood that the names of signals between the devices or the names of parameters in the signals in the embodiments described below are only an example, and other names may be used in the specific implementation, which is not specifically limited in the embodiments of the present application.

Taking the interaction between the network device 50 shown in fig. 5 and the first terminal device and the second terminal device respectively as an example, as shown in fig. 9, a phase calibration method provided in an embodiment of the present application includes the following steps:

s901, the network equipment acquires first indication information. 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 phase calibration between the first terminal device and the other terminal devices may refer to: under the condition that the first terminal equipment and other terminal equipment carry out coherent aggregation transmission, the first terminal equipment compensates phase difference and/or frequency offset corresponding to the condition that the first terminal equipment and other terminal equipment send signals simultaneously.

For example, aggregation transmission is performed between the first terminal device and the second terminal device, where the second terminal device is another terminal device. The phase calibration between the first terminal device and the second terminal device may refer to that the first terminal device compensates a phase difference and/or a frequency offset corresponding to when the first terminal device and the second terminal device simultaneously transmit signals. It may be appreciated that the aggregate transmission between the first terminal device and the second terminal device may be the aggregate transmission between the first terminal device and the second terminal device using CJT, and the description of the CJT in the preamble of the embodiment may be referred to, which is not repeated herein.

Optionally, in an implementation of the present application, the network device acquires the first indication information (step S901), which may include: the first terminal device sends capability information to the network device, wherein the capability information is used for indicating that the first terminal device has the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and other terminal devices. Accordingly, the network device receives the capability information from the first terminal device and determines the first indication information according to the capability information. That is, if the first terminal device has the capability of obtaining 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 according to the capability information of the first terminal device; if the first terminal equipment does not have the function of acquiring the phase difference information and/or the frequency offset information between the first terminal equipment and other terminal equipment, the network equipment gives up acquiring 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 interaction caused by sending the first indication information exceeding the capability of the first terminal device to the first terminal device, thereby improving the efficiency of phase calibration.

Alternatively, in the embodiment of the present application, the capability information may be carried in signaling of the radio resource control (radio resource control, RRC) capability report. The signaling for reporting the RRC capability may include an additional cell for phase calibration capability.

Or, alternatively, the capability information may be information of the terminal device aggregate coherent transmission capability. That is, in the case that the first terminal device sends the network device that the terminal device has the capability of aggregate coherent transmission, the first terminal device defaults to have the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

Or, alternatively, the capability information may be information of a coherence time window size. The coherence time window may indicate that the terminal device may ensure power consistency and/or phase continuity in the time window, so as to perform aggregate coherent transmission. That is, in the case that the first terminal device transmits information of the coherence time window size to the network device, the first terminal device is provided with the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device by default.

Or optionally, in the embodiment of the present application, the network device may acquire the first indication information under a condition that it is determined that the first terminal device and the second terminal device perform aggregate transmission. That is, in the case that the first terminal device performs aggregation transmission, the protocol agrees that the default first terminal device has the capability of obtaining phase difference information and/or frequency offset information between the first terminal device and other terminal devices, and thus the network device can determine the first indication information without the need of the first terminal device to send the capability information.

Or, alternatively, the network device may obtain the first indication information when it is determined that the first terminal device performs coherent aggregation with the second terminal device. Wherein, the coherent aggregate transmission may refer to cqt. That is, in the case that the first terminal device performs CJT, the protocol agrees with the capability of the default first terminal device to specifically obtain phase difference information and/or frequency offset information between the first terminal device and other terminal devices, so that the network device may determine the first indication information without the need for the first terminal device to send the capability information.

S902, the network equipment sends first indication information to the first terminal equipment. Accordingly, the first terminal device receives the first indication information from the network device.

Optionally, in the embodiment of the present application, the first indication information may include first SRS resource configuration information, where the first SRS resource configuration information is used to indicate 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 the embodiment of the present application, after the first terminal device receives the first SRS resource configuration information for receiving the SRS, the first terminal device may receive the first SRS from the second terminal device according to the first SRS resource configuration information, and measure the first SRS to obtain phase difference information and/or frequency offset information before the first terminal device and the second terminal device. That is, in the embodiment of the present application, the first SRS resource configuration information for the first terminal device to receive the 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 one possible implementation manner, the first SRS resource configuration information includes a user indicating that the first SRS resource configuration information is used for the first terminal device to receive the SRS. The user may be a new user type in the SRS resource configuration information. For example, in a case where a user in the first SRS resource configuration information is configured to "transmit", the first SRS resource configuration information is used to transmit the SRS. In the case where the user in the first SRS resource configuration information is configured to "receive", the first SRS resource configuration information is used to receive the SRS. That is, the first indication information may be information in which a user is configured to be "received" in the first SRS resource configuration information, so that the first SRS resource configuration information may be implicitly indicated for phase calibration between the first terminal device and the other terminal devices.

Or, alternatively, the usage indicates that the first SRS resource configuration information is used for phase calibration between the first terminal device and the other terminal device. That is, since the SRS resource configuration information itself is used for the terminal device to transmit the SRS, in the case where the SRS resource configuration information is used for phase calibration, it may be implicitly indicated that the SRS resource configuration information is used for the terminal device to receive the 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 one OFDM symbol may include 3 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, when the symbol type corresponding to the time domain resource information included in the first SRS resource configuration information is a downlink symbol, the first SRS resource configuration information may be indicated to be used for receiving the SRS, and further, the first SRS resource configuration information is implicitly indicated to be used for phase calibration between the first terminal device and other terminal devices.

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

Or, alternatively, in the embodiment of the present application, the first indication information may be used to activate the first terminal device to receive the SRS on the time-frequency resource indicated by the first SRS resource configuration information. For example, 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, so that the first terminal device may be activated to receive the SRS on the time-frequency resource indicated by the first SRS resource configuration information.

It should be appreciated that the first indication information indicates that the first terminal device receives SRS on the time-frequency resources indicated by the first SRS resource configuration information may implicitly indicate that the first SRS resource configuration information is used for phase calibration between the first terminal device and other terminal devices.

Alternatively, in the embodiment of the present application, the signaling carrying the first indication information may include first RRC signaling, or first medium access control (media access control, MAC) layer signaling, or first DCI signaling, which is not specifically limited in the embodiment of the present application.

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

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

Alternatively, in the embodiment of the present application, the first indication information may be sent together as a whole, or may be sent separately by being divided into a plurality of sub-information, and the sending periods and/or sending timings of the sub-information may be the same or different. The specific transmission method is not limited in this application. The transmission period and/or the transmission timing of the sub-information may be predefined, for example, predefined according to a protocol, or may be configured by the network device by transmitting configuration information to the terminal device.

Alternatively, in the embodiment of the present application, the first indication information may be sent through one message, or may be sent 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 three types of signaling involved in the transmission of the first indication information: physical layer signaling, also known as layer1 (L1) signaling, may be carried generally by a control portion in a physical layer frame. A typical example of L1 signaling is DCI carried in PDCCH defined in LTE standard. In some cases, L1 signaling may also be carried by the data portion in the physical layer frame. It will be appreciated that the transmission period or signaling period of L1 signaling is typically the period of the physical layer frame, and thus such signaling is typically used to implement some dynamic control to convey some information that changes frequently, e.g., the first signaling in the embodiments of the present application may be conveyed by physical layer signaling. MAC layer signaling belongs to layer2 (L2) signaling, which may typically be carried by, for example, but not limited to, a frame header of a layer two frame. The frame header may also carry information such as, but not limited to, source address and destination address. The second layer frames typically contain a frame body in addition to the frame header. In some cases, L2 signaling may also be carried by the frame body of the second layer frame. Typical examples of the second layer signaling are the signaling carried in the frame control (frame control) field in the frame header of a MAC frame in the 802.11 series of standards, or a MAC control entity (MAC-CE) defined in some communication protocols. The second layer frame may typically carry the data portion of the physical layer frame. RRC signaling belongs to layer 3 signaling, which is typically some control messages, and L3 signaling may be typically carried in the frame body of the layer two frame. The present section describes only the principle descriptions of the physical layer signaling, the MAC layer signaling, the RRC signaling, the first layer signaling, the second layer signaling, and the third layer signaling, and specific details regarding the three signaling may refer to the prior art and are not described herein again.

It may be appreciated that in the embodiment of the present application, the first SRS resource configuration information includes a time-frequency domain location of an SRS, where the time-frequency domain location of the SRS may be a time-frequency domain location where the SRS sent by other terminal devices to the network device is located. For example, taking aggregation transmission of the first terminal device and the second terminal device as an example, the time-frequency domain position of the SRS in the first SRS resource configuration information may be the time-frequency domain position where the first SRS sent by the second terminal device to the network device is located. That is, the first terminal device may determine the time-frequency domain position of the first SRS transmitted to the network device by the second terminal device according to the time-frequency domain position of the SRS in the first SRS resource configuration information.

Optionally, in the embodiment of the present application, the network device may send SRS resource configuration information about the first SRS to the second terminal device through a system message or RRC signaling. Accordingly, 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. Wherein the SRS resource configuration information regarding the first SRS may include one or more SRS resource sets. One SRS resource set may include one or more SRS resources. The one or more SRS resources are used for the second terminal device to transmit the one or more SRS. The one or more SRS may include a first SRS. The second terminal device may transmit the first SRS according to SRS resource configuration information about the first SRS from the network device.

Alternatively, in the 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), which is not specifically limited in the embodiment of the present application.

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

It can be appreciated that in the embodiment of the present application, the second terminal device may also send the first SRS to the network device. Accordingly, the network device receives the first SRS from the second terminal device. The network device may perform CSI measurement according to the first SRS to obtain CSI corresponding to the second terminal device at the time of transmitting the first SRS.

S904, the first terminal equipment measures the first SRS 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 the frequency offset information are used for compensating the phase difference and/or the frequency offset corresponding to the first signal transmitted by the first terminal equipment and the second terminal equipment.

It should be understood that the first signal is a signal for simultaneously transmitting the cooperative data when the first terminal device performs coherent aggregation transmission with the second terminal device. The data or TB carried by the first signal and sent by the first terminal device may be the same as the data or TB carried by the first signal and sent by the second terminal device, and specific reference may be made to the related description in the preamble of the third embodiment "eighth, multi-terminal device cooperative transmission", which is not described herein again.

Alternatively, in the embodiment of the present application, the first terminal device may send the collaboration data to the second terminal device. Accordingly, the second terminal device receives the collaboration data from the first terminal device. Wherein the first terminal device may be referred to as a SUE and the second terminal device may be referred to as a CUE.

Or, alternatively, the second terminal device sends the collaboration data to the first terminal device. Accordingly, the first terminal device receives the collaboration data from the second terminal device. Wherein the first terminal device may be referred to as a CUE and the second terminal device may be referred to as a SUE.

The following describes a coherent aggregation transmission mode in the embodiment of the present application.

It should be understood that, based on the description of the cqt in the preamble of the detailed description, in the embodiments of the present application, coherent aggregation transmission may be divided into two modes according to whether the precoding matrix at the CSI measurement time compensates for the phase difference and/or the frequency offset. Before describing two coherent aggregation transmission modes in the embodiments of the present application, a "first time" and a "second time" related to coherent aggregation transmission are first described.

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

Optionally, in the embodiment of the present application, the first terminal device may determine to send the first signal using a codebook transmission manner according to the usage in the SRS resource configuration information, or send the first signal using a non-codebook transmission manner. For example, referring to the description of the usages of the SRS resources in the preamble of the specific embodiment, in the case that the usages in the SRS configuration information are configured as "codebooks", the SRS resources are configured for uplink channel information acquisition in the codebook transmission scheme; in the case that the usage in the SRS resource configuration information is configured as a "non-codebook", the SRS resource configuration information is used for obtaining uplink channel information of the non-codebook transmission scheme; alternatively, the first terminal device may further determine whether to send the first signal by using a codebook transmission manner through the higher layer parameter txconfig, which is not specifically limited in the embodiment of the present application.

Alternatively, in the embodiment of the present application, the coherent aggregation transmission may be two ways.

Coherent aggregation transmission mode one: in case the precoding matrix determined at the first time instant has compensated for a phase difference and/or a frequency offset between the first terminal device and the second terminal device at the first time instant (e.g. the jointly determined precoding matrix in cqt), the phase difference and/or the frequency offset between the first terminal device and the second terminal device at the second time instant and the first time instant is compensated for.

Optionally, in an embodiment of the present application, the phase difference corresponding to 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 a phase difference between the first terminal device and the second terminal device at a first moment, and the second phase difference is a phase difference between the first terminal device and the second terminal device at a second moment. That is, the first terminal device compensates for a difference between the first phase difference and the second phase difference when the first terminal device transmits the first signal using the phase difference information and/or the frequency offset information.

It may be appreciated that in the first coherent aggregation transmission mode, the first terminal device already compensates the first phase difference when transmitting the first signal using the precoding matrix determined at the first time, however, when the phase changes between the first terminal device and the second terminal device are inconsistent, the second phase difference is different from the first phase difference, and further 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. By way of example, assuming that the first phase difference is 10 ° at the first time and the second phase difference is 30 ° at the second time, the first terminal device also needs to compensate for the phase difference of 20 ° since the precoding matrix determined at the first time has already compensated for the phase difference of 10 °.

Optionally, in the embodiment of the present application, the frequency offset corresponding to 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 equipment and the second terminal equipment at a first moment, and the second frequency offset is the frequency offset between the first terminal equipment and the second terminal equipment at a second moment. It will be appreciated that the first terminal device has compensated for the first phase difference, i.e. the phase difference caused by the first frequency offset, when transmitting the first signal using the precoding matrix determined at the first time. 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 then the first terminal device needs to compensate the difference between the first frequency offset and the second frequency offset according to the frequency offset information. By way of example, assuming that the phase difference caused by the first frequency offset is 10 ° at the first time and the phase difference caused by the second frequency offset is 30 ° at the second time, the first terminal apparatus also needs to compensate for the phase difference of 20 ° since the precoding matrix determined at the first time has already compensated for the phase difference of 10 °.

And a coherent aggregation transmission mode II: and compensating the phase difference and/or the frequency offset between the first terminal equipment and the second terminal equipment at the second moment under the condition that the pre-coding matrix determined at the first moment does not compensate the phase difference and/or the frequency offset between the first terminal equipment and the second terminal equipment at the first moment.

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

It can be appreciated that in the second coherent aggregation transmission mode, the first terminal device does not compensate the first phase difference when transmitting the first signal using the precoding matrix determined at the first time, and thus the first terminal device only needs to compensate the second phase difference according to the phase difference information and/or the frequency offset information. By way of example, assuming that the first phase difference is 10 ° at the first time and the second phase difference is 30 ° at the second time, since the precoding matrix determined at the first time does not compensate for the phase difference of 10 °, the first terminal device needs to compensate for the phase difference of 30 °.

It should be understood that in the embodiment of the present application, the "time instant" 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 manner, the first time may be a first symbol corresponding to a time domain resource of the SRS used for CSI measurement sent by the terminal device; or, in the non-codebook transmission mode, the first time may be a first symbol corresponding to a time domain resource of the CSI-RS transmitted by the network device. The second time instant may be a first symbol of a time domain resource that transmits the first signal.

Since the first time is related to CSI measurement, the CSI measurement may be divided into measurement of SRS in a codebook transmission manner and measurement of CSI-RS in a non-codebook transmission manner, and the first time is described below according to the transmission time of SRS and the transmission time of CSI-RS.

Optionally, in the embodiment of the present application, when the first terminal device determines that the first signal is sent by using the codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device sends the second SRS to the network device, where 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 a time when the second terminal device sends the third SRS to the network device, where 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 appreciated that in the embodiment of the present application, the time when the first terminal device transmits the second SRS may be earlier than the time when the second terminal device transmits the third SRS. Alternatively, the first terminal device may transmit the second SRS at a time later than the time at which the second terminal device transmits the third SRS. In the case where the time when the first terminal device transmits the second SRS is different from the time when the second terminal device transmits the third SRS, the first terminal device may select the maximum value or the minimum value of the two as the CSI measurement time, which is not specifically limited in the embodiment of the present application.

For example, taking a schematic measurement time diagram of the first terminal device and the second terminal device shown in fig. 10 when performing aggregate transmission by using a codebook transmission manner as an example, as shown in fig. 10, the first time is a time when the first terminal device sends a second SRS, and the second SRS is used for CSI measurement of an uplink channel; or the first moment is the moment when the second terminal equipment sends the third SRS, and the third SRS is used for measuring the CSI of the uplink channel. It may be appreciated that the time at which the second terminal device transmits the third SRS may be before or after the time at which the second terminal device transmits the first SRS; alternatively, the third SRS may be the first SRS; alternatively, the time when the first terminal device transmits the second SRS may be before or after the time when the second terminal device transmits the first SRS, which is not specifically limited in the embodiments of the present application.

It should be understood that in the embodiment of the present application, the second terminal device may send one or more SRS to the network device before or after sending the first SRS to the network device; alternatively, the second terminal device may not have transmitted the SRS to the network device before transmitting the first SRS to the network device, which is not specifically limited in the embodiments of the present application.

It is understood that the third SRS may be the first SRS in a case where the second terminal device has not transmitted the SRS to the network device before transmitting the first SRS to the network device. That is, the CSI measurement time determined by the first terminal device is a time when the third SRS is transmitted.

Optionally, in the embodiment of the present application, when the first terminal device determines to send the first signal by using the non-codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device receives the CSI-RS from the network device. That is, in case the first terminal device determines to transmit the first signal using the non-codebook transmission, the first time instant is a time instant 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 transmits the first SRS, which is not specifically limited in the embodiments of the present application.

The phase difference information, the frequency offset information and the calculation method in the implementation of the present application are described below.

Optionally, in the embodiment of the present application, the phase difference information between the first terminal device and the second terminal device includes a 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 a phase difference caused by frequency offset between the first terminal device and the second terminal device and a phase difference caused by other factors, and specific reference may be made to the relevant description of "8.1.2 and frequency offset" in the preamble of the specific embodiment, which is not repeated herein.

Optionally, in the embodiment of the present application, the frequency offset information between the first terminal device and the second terminal device includes a frequency offset between the first terminal device and the second terminal device, where the first terminal device measures a first SRS.

Alternatively, in the embodiment of the present application, the second terminal device may send the first SRS at multiple times. Accordingly, the first terminal device may receive the first SRS from the second terminal device at multiple times, and measure the first SRS at the multiple times to obtain a phase difference and/or a frequency offset between the first terminal device and the second terminal device corresponding to different times. That is, in the embodiment of the present application, the phase difference information between the first terminal device and the second terminal device may include a phase difference between the first terminal device and the second terminal device corresponding to different times of transmitting the first SRS, and the frequency offset information between the first terminal device and the second terminal device includes a frequency offset between the first terminal device and the second terminal device corresponding to different times of transmitting the first SRS.

Illustratively, taking two different moments of transmitting the first SRS as a third moment and a fourth moment as shown in fig. 10, and taking the example that the third moment is before the fourth moment, the phase difference information between the first terminal device and the second terminal device includes that the phase difference between the first terminal device and the second terminal device corresponding to the third moment is Δψ _{c_s} (t ₃ ) The phase difference between the first terminal device and the second terminal device corresponding to the fourth time is delta phi _{c_s} (t ₄ ) The frequency offset between the first terminal device and the second terminal device at the third time and the fourth time is delta f _{c_s} . Wherein t is ₃ Indicating a third time, t ₄ Indicating a fourth time.

Exemplary embodimentsIn the embodiment of the present application, Δf may be obtained by _{c_s} 、Δψ _{c_s} (t ₃ ) And Deltapsi _{c_s} (t ₄ ). The specific mode is as follows:

the first terminal device is according to t ₃ And t ₄ The first SRS from the second terminal equipment is received at the moment, and t is obtained through channel estimation (such as SVD) ₃ Total phase θ of time _{c_s} (t ₃ ) And t ₄ Total phase θ of time _{c_s} (t ₄ ). Wherein 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 theta _{c_s} (t ₄ ) Is a known quantity.

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)

The simultaneous subtraction of equation (9) and equation (10) yields Δf _{c_s} ，Δf _{c_s} Can be calculated from equation (11).

Δf _{c_s} ＝(θ _{c_s} (t ₄ )-θ _{c_s} (t ₃ ))/(2π(t ₄ -t ₃ ) Formula (11))

According to the formula (11) and the formula (9) or the formula (10), delta phi can be calculated _{c_s} (t ₃ ). Wherein at Deltapsi _{c_s} (t ₃ ) And Δf _{c_s} In the known case, Δψ can be calculated according to equation (12) _{c_s} (t ₄ )。

Δψ _{c_s} (t ₄ )＝2π(Δf _{c_s} ·(t ₄ -t ₃ ))+Δψ _{c_s} (t ₃ ) Formula (12)

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

It should be appreciated that referring again to fig. 10, the fourth time may be earlier than the second time and the first time may be earlier than the third time. Alternatively, the third time may be equal to the first time; alternatively, the first time and the fourth time may be the same; alternatively, the first time may also be after the fourth time, which is not specifically limited in the embodiments of the present application.

Optionally, in the embodiment of the present application, the first terminal device may determine, according to the first SRS received at two different times, a phase difference and/or a frequency offset between the first terminal device and the second terminal device, which respectively correspond to the two different times, respectively, and estimate, according to the phase difference and/or the frequency offset between the first terminal device and the second terminal device, which respectively correspond to the two different times, a phase difference corresponding to when the first terminal device and the second terminal device send the first signal.

Next, a mode in which the first terminal device estimates a phase difference corresponding to when the first terminal device and the second terminal device transmit the first signal will be described with reference to the third time and the fourth time shown in fig. 10.

Mode one: the first terminal device may estimate a phase difference corresponding to when the first terminal device and the second terminal device transmit the first signal according to equation (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 ) Indicating the phase difference, 2 pi (Δf), corresponding to the first signal transmitted by the first terminal device and the second terminal device _{c_s} ·(t ₂ -t ₄ ) A phase difference caused by a frequency offset between the first terminal device and the second terminal device corresponding between the second time instant and the fourth time instant. Wherein Deltapsi is _{c_s} (t ₄ ) Can be determined by equation (12).

Equation (14) can be obtained from equation (13) and equation (12). Wherein Δψ can be obtained by the formula (14) _{c_s} (t ₂ ). That is to say by a phase between a first terminal device and said second terminal deviceThe bit difference information and the frequency offset information can compensate phase difference and/or frequency offset corresponding to the first signal sent by the first terminal device and the second terminal device.

Δψ _{c_s} (t ₂ )＝2π(Δf _{c_s} ·(t ₂ -t ₃ ))+Δψ _{c_s} (t ₃ ) Formula (14)

It can be appreciated that equation (14) may be used to compensate for a phase difference corresponding to when the first terminal device and the second terminal device transmit the first signal in the second coherent combining transmission mode.

In the second mode, in the first coherent aggregation transmission mode, the phase difference corresponding to the first time is already compensated by the precoding matrix, so that the first terminal device can only compensate the phase difference caused by the frequency offset corresponding to the first signal when the first terminal device and the second terminal device send the first signal. Wherein the first terminal device may obtain the frequency offset Δf between the first terminal device and the second terminal device according to the third time and the fourth time _{c_s} And estimating a phase difference caused by the corresponding frequency offset when the first terminal equipment and the second terminal equipment send the first signal. The phase difference caused by the frequency offset corresponding to the first signal transmitted by the first terminal device and the second terminal device 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 Indicating the first time, 2pi (Δf _{c_s} ·(t ₂ -t ₁ ) A phase difference caused by a frequency offset between the first terminal device and the second terminal device corresponding to the second time and the first time.

It can be understood that in the coherent aggregation transmission mode one, in the case that the first terminal device and the second terminal device transmit the first signal by using the codebook transmission mode, t ₁ The first time indicated is the time at which the SRS was transmitted (e.g., the second SRS transmitted by the first terminal device or the third SRS transmitted by the second terminal device). In the case that the first terminal device and the second terminal device transmit the first signal by using a non-codebook transmission mode, t ₁ The first moment of presentation is the network deviceTime of transmitting CSI-RS.

It will be appreciated that Δψ in equation (14) or equation (15) may be calculated from the phase difference information and/or frequency offset information between the first terminal device and the second terminal device _{c_s} (t ₂ ) The phase difference and/or the frequency offset corresponding to the first signal sent by the first terminal device and the second terminal device can be compensated.

The actions of the network device in the steps S901 to S904 may be performed by the processor 601 in the communication apparatus 600 shown in fig. 6 by calling the application program code stored in the memory 603 to instruct the network device, and the actions of the first terminal device in the steps S901 to S904 may be performed by the processor 601 in the communication apparatus 600 shown in fig. 6 by calling the application program code stored in the memory 603 to instruct the first terminal device, which is not limited in the embodiment of the present application.

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

the network device sends third indication information to the first terminal device. Accordingly, 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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M. That is, the first terminal device may acquire a plurality of SRS resources for phase calibration between the first terminal device and other terminal devices according to the third indication information, and further the first terminal device may receive a plurality of different SRS on a plurality of time-frequency resources to perform phase calibration, thereby improving efficiency of phase calibration.

Alternatively, the SRS resource configuration information for which the M SRS resource configuration information is a candidate may refer to: after receiving the trigger signaling of one or more SRS resource configuration information in the M SRS resource configuration information, the first terminal equipment performs phase calibration according to the one or more SRS resource configuration information. That is, the first indication information may be used to trigger N SRS resource configuration information in the M SRS resource configuration information, so that the first terminal device performs phase calibration according to the N SRS resource configuration information.

The third indication information may be, for example, higher layer signaling, such as RRC signaling. Wherein the third indication information may include the M SRS resource configuration information; alternatively, the third indication information may include index information of the M SRS resource configuration information.

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

Optionally, in the 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), the method further includes:

The first terminal equipment compensates the phase difference and/or the frequency offset corresponding to the first signal sent by the first terminal equipment and the second terminal equipment according to the phase difference information and/or the frequency offset information, sends the compensated first signal to the network equipment, and sends the first signal to the network equipment by the second terminal equipment. Accordingly, the network device receives the compensated first signal from the first terminal device and receives the first signal from the second terminal device. The first terminal equipment compensates the first signal according to the phase difference information and/or the frequency offset information.

Illustratively, the first signal before precoding is x ₁ The precoding matrix is V, and the phase difference is Δψ in the first or second mode _{c_s} (t ₂ ) For example, =ψ, the compensated first signal may be denoted as e ^-jψ Vx ₁ Or e ^jψ Vx ₁ . The precoding matrix is indicated by the network equipment, and the precoding matrix is the precoding matrix corresponding to the first moment. The implementation of the network device indication precoding matrix may include: under the condition that a first terminal device sends a first signal by using a codebook transmission mode, indicating the precoding matrix by network equipment through a TPMI; or, in the case that the first terminal device sends the first signal in a non-codebook transmission manner, the network device indicates the precoding matrix through the SRI, and the implementation manner may refer to the description of the preamble of the specific embodiment, which is not repeated herein.

It should be appreciated that the second terminal device may not need to compensate for the first signal in the case where the first terminal device compensates for a phase difference and/or frequency offset corresponding to when the first signal is transmitted by the first terminal device and the second terminal device according to the phase difference information and/or frequency offset information.

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

It can be appreciated that, according to codebook transmission, non-codebook transmission, coherent aggregation transmission mode one, and coherent aggregation transmission mode two, the phase calibration method provided in the embodiments of the present application may be applied to the following four scenarios.

Scene one, codebook transmission and coherent aggregation transmission mode one

In scenario one, the first terminal device needs to transmit 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 transmitting the compensated first signal. Correspondingly, the network device may perform channel measurement according to the SRS transmitted by the first terminal device and the second terminal device, jointly determine precoding matrices corresponding to the first terminal device and the second terminal device at the first moment, and transmit uplink scheduling grant information to the first terminal device. The network device indicates a precoding matrix corresponding to the first terminal device through the TPMI in the uplink scheduling grant information, and then the first terminal device may send the compensated first signal.

Scene two, codebook transmission and coherent aggregation transmission mode two

The second scenario is similar to the first scenario, in that the network device performs channel measurement according to SRS transmitted by the first terminal device and the second terminal device, and determines precoding matrices corresponding to the first terminal device and the second terminal device at the first moment respectively and independently. The method comprises the steps of determining a precoding matrix corresponding to first terminal equipment and a precoding matrix corresponding to second terminal equipment respectively and independently, wherein the first phase difference between the first terminal equipment and the second terminal equipment and/or the phase difference caused by first frequency offset are not compensated.

Scene three, transmission mode two using non-codebook and coherent aggregation

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 respectively send the SRS precoded by the precoding matrix to the network device according to the non-codebook transmission procedure to obtain the corresponding precoding vectors, which can be see the relevant description of the preamble section "7.2 and the non-codebook transmission" of the specific embodiment.

It may be appreciated that in the third scenario, the network device may send 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.

Scene four, one mode of transmission by using non-codebook and coherent aggregation

Scene four is similar to scene three except that the first terminal device and the second terminal device need to share channel information to implement joint determination of the precoding matrix.

The following describes a specific embodiment of scenario four.

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

step S905, the network device transmits third instruction information to the second terminal device. Accordingly, the second terminal device receives the third indication information from the network device. The third indication information is used for indicating the second terminal equipment to send the first channel information to the first terminal equipment. The first channel information comprises a channel matrix obtained by measuring the CSI-RS by the second terminal equipment. 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. The first channel information comprises a first channel matrix obtained by measuring the CSI-RS by the second terminal equipment.

It may be appreciated that the second terminal device may receive CSI-RS from the network device through CSI-RS resource configuration information configured by higher layer signaling.

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

Optionally, in the embodiment of the present application, the third indication information further includes second resource configuration information, where the second resource configuration information is used to indicate granularity of sending the first channel information to the first terminal device by the second terminal device. The granularity of the first channel information refers to the granularity of frequency domain resources corresponding to a channel matrix obtained by measuring the CSI-RS by the second terminal device. The granularity of the frequency domain resources may be configured as wideband (i.e., entire bandwidth), sub-band, and sub-carrier. It will be appreciated that in the case where the granularity of the frequency domain resource to which the channel matrix corresponds is configured to be broadband, the first channel information includes one channel matrix corresponding to the entire bandwidth. In the case that granularity of the frequency domain resource corresponding to the channel matrix is configured as a subband, the first channel information may include a channel matrix corresponding to each subband in the entire bandwidth. In the case where the granularity of the frequency domain resource corresponding to the channel matrix is configured as a subcarrier, the first channel information may include a channel matrix corresponding to each subcarrier in the entire bandwidth.

S906, the network equipment sends second indication information to the first terminal equipment. Accordingly, the first terminal device receives the second indication information from the network device. The second indication information is used for indicating the first terminal equipment to send the first precoding matrix to the second terminal equipment. The first precoding matrix determines a precoding matrix corresponding to a first moment when the first terminal equipment sends the first signal by using a non-codebook transmission mode.

Optionally, in the embodiment of the present application, the second instruction information may further 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 configuring transmission resources between the first terminal equipment and the second terminal equipment. The fourth resource configuration information is similar to the second resource configuration information, and is used for indicating granularity of the frequency domain resource corresponding to the channel matrix, and specifically, reference may be made to related descriptions about the first resource configuration information and the second resource configuration information, which are not described herein.

It should be understood that, in the embodiment of the present application, there is no necessary execution sequence between the step S905 and the step S906, and the step S905 may be executed first and then the step S906 may be executed. Step S906 may be performed first, and then step S905 may be performed; the above step S905 and step S906 may also be performed simultaneously, which is not particularly limited in the embodiment of the present application.

S907, the second terminal equipment sends the first channel information to the first terminal equipment according to the third indication information. Accordingly, the first terminal device receives the first channel information from the second terminal device. That is, the second terminal device may enable sharing of a channel matrix of a downlink channel between the second terminal device and the network device between the first terminal device and the second terminal device by transmitting the first channel information to the first terminal device.

S908, the first terminal equipment determines a first precoding matrix according to the first channel information and second channel information obtained by the first terminal equipment measuring the CSI-RS. 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, which is a channel matrix of a downlink channel between the first terminal device and the network device.

Optionally, in the 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 cqt manner.

Optionally, in the 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 the 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), the first terminal device determines a first precoding matrix according to the first channel information and second channel information obtained by the first terminal device measuring the CSI-RS (step S908), including: the first terminal equipment determines a first precoding matrix according to the phase difference information and/or the frequency offset information, the first channel information and the second channel information. That is, the first terminal device may compensate the phase difference information and/or the frequency offset information obtained in step S903 in the first precoding matrix when determining the first precoding matrix.

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

Or optionally, the first terminal device determines a first precoding matrix according to the first channel information and the second channel information, and compensates the phase difference information and/or the frequency offset information on the precoding matrix corresponding to the first terminal device in the first precoding matrix. The first precoding matrix includes a precoding matrix V corresponding to the first terminal device ₁ Precoding matrix V corresponding to second terminal equipment ₂ The first terminal device uses the delta phi in the first mode or the second mode _{c_s} (t ₂ ) =ψ is compensated in precoding matrix V ₁ Can be expressed as e ^-jψ V ₁ Or e ^jψ V ₁ 。

S909, the first terminal equipment sends the first precoding matrix to the second terminal equipment according to the second indication information. Accordingly, the second terminal device receives the first precoding matrix from the first terminal device. That is, the first terminal device transmits the first precoding matrix to the second terminal device, and the first precoding matrix may be shared between the first terminal device and the second terminal device.

It may be appreciated that after the first terminal device and the second terminal device determine the corresponding precoding matrices respectively, the SRS may be precoded according to the corresponding precoding matrices respectively, and the precoded SRS may be sent to the network device, and then the network device indicates the precoding vectors corresponding to the first terminal device and the second terminal device by sending the corresponding SRIs to the first terminal device and the second terminal device respectively, which may be specifically referred to the relevant description of "7.1.2 and non-codebook transmission" in the preamble section of the specific embodiment, and will not be described herein.

Alternatively, in the embodiment of the present application, steps S905 to S909 may also be performed before step S903.

Optionally, as shown in fig. 11, in the embodiment of the present application, after step S909, the method further includes:

s910, the first terminal equipment performs precoding on the first signal according to the precoding matrix corresponding to the first terminal equipment in the first precoding matrix, compensates the first signal according to the phase difference information and/or the frequency offset information between the first terminal equipment and the second terminal equipment, and sends the first signal subjected to precoding and compensation to the network equipment. Accordingly, the network device receives the precoded and compensated first signal from the first terminal device.

It may be appreciated that if the first terminal device performs phase compensation on the first precoding matrix in step S908, the first terminal device may not need to compensate the first signal according to the phase difference information and/or the frequency offset information between the first terminal device and the second terminal device in step S910.

S911, the second terminal equipment performs precoding on the first signals according to the precoding matrix corresponding to the second terminal equipment in the first precoding matrix, and sends the precoded first signals to the network equipment. Accordingly, the network device receives the first signal from the second terminal device.

In the embodiment of the present application, the first indication information indicates that the first SRS resource allocation 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 may receive the first SRS from the second terminal device, and measure the first SRS to obtain phase difference information and/or frequency offset information between the first terminal device and the second terminal device, and by using the phase difference information and/or frequency offset information, a phase difference caused by that a phase change and/or a frequency offset change between the first terminal device and the second terminal device are inconsistent when the first terminal device and the second terminal device send the first signal simultaneously may be compensated, so that coherence between signals transmitted by aggregation between the first terminal device and the second terminal device may be improved, so as to improve power gain of the multi-channel signal co-directional superposition. Therefore, based on the phase calibration method provided by the embodiment of the application, the coherence of the multi-channel signal transmitted in an aggregation manner can be improved when the phase change and/or the frequency offset change among a plurality of terminal devices are inconsistent, so that the power gain of the co-directional superposition of the multi-channel signal can be improved.

The actions of the network device in the steps S901 to S911 may be performed by the processor 601 in the communication apparatus 600 shown in fig. 6 by calling the application program code stored in the memory 603 to instruct the network device, and the actions of the first terminal device in the steps S901 to S911 may be performed by the processor 601 in the communication apparatus 600 shown in fig. 6 by calling the application program code stored in the memory 603 to instruct the first terminal device, which is not limited in the embodiment of the present application.

It should be understood that the above solution only uses the aggregate transmission of the first terminal device and the second terminal device as an example for the phase calibration method of the present application, and the above solution is also applicable to a scenario in which three or more terminal devices perform aggregate transmission.

For example, taking three terminal devices including a first terminal device, a second terminal device and a third terminal device as an example, the first terminal device receives indication information from a network device, where the indication information indicates that 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 second terminal equipment receives indication information from the network equipment, wherein the indication information is used for indicating the second SRS resource configuration information received by the second terminal equipment to be used for phase calibration between the second terminal equipment and other terminal equipment; and the third terminal equipment receives the indication information of the network equipment, the indication information indicates that the third SRS resource allocation information received by the third terminal equipment is used for phase calibration between the third terminal equipment and other terminal equipment, and then the first terminal equipment or the second terminal equipment or the third terminal equipment respectively receive the SRS and measure and obtain phase difference information and/or frequency offset information among the first terminal equipment, the second terminal equipment and the third terminal equipment. The phase difference information and/or the frequency offset information among the first terminal equipment, the second terminal equipment and the third terminal equipment are used for compensating the phase difference and/or the frequency offset among the first terminal equipment, the second terminal equipment and the third terminal equipment.

It will be appreciated that in the various embodiments above, the methods and/or steps implemented by the network device may also be implemented by components (e.g., chips or circuits) that may be used in the network device; the methods and/or steps implemented by the terminal device may also be implemented by components (e.g., chips or circuits) available to the terminal device.

The above description has been presented mainly from the point of interaction between the network elements. Correspondingly, the embodiment of the application also provides a communication device which is used for realizing the various methods. The communication device may be a terminal device in the above method embodiment, or a device including the above terminal device, or a component that may be used for the terminal device; alternatively, the communication device may be a network device in the foregoing method embodiment, or an apparatus including the foregoing network device, or may be a component that may be used in the network device, where, in order to implement the foregoing function, the communication device includes a corresponding hardware structure and/or a software module that performs each function. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the functional modules of the communication device may be divided according to the above embodiment of the method, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be understood that the division of the modules in the embodiments of the present application is illustrative, and is merely a logic function division, and other division manners may be implemented in practice.

For example, taking the communication apparatus as the first terminal device in the above method embodiment as an example, fig. 12 shows a schematic structural diagram of the first terminal device 120. The first terminal device 120 comprises a transceiver module 1201 and a processing module 1202. The transceiver module 1201 may also be referred to as a transceiver unit for implementing a transceiver function, and may be, for example, a transceiver circuit, a transceiver, or a communication interface.

The transceiver module 1201 is configured to receive first indication information from a network device, where the first indication information is used to indicate that first SRS resource configuration information received by a first terminal device is used for phase calibration between the first terminal device and other terminal devices; the transceiver module 1201 is further configured to receive, according to the first indication information, the first SRS from the second terminal device on the time-frequency resource indicated by the first SRS resource configuration information; and the processing module 1202 is configured to measure 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 the frequency offset information are used for compensating the phase difference and/or the frequency offset corresponding to the first signal transmitted by the first terminal equipment and the second terminal equipment.

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

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

In some embodiments, the first indication information includes first SRS resource configuration information including a user. The user indicates that the first SRS resource configuration information is used for the first terminal equipment 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.

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

In some embodiments, in a case where the first terminal device determines to transmit the first signal using the non-codebook transmission mode, the CSI measurement time determined by the first terminal device is a time when the first terminal device receives the CSI-RS from the network device.

In some embodiments, the transceiver module 1201 is further configured to receive second indication information from the network device, where the second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device, and the first precoding matrix determines, for the first terminal device, a precoding matrix corresponding to a first time when the first signal is sent using a non-codebook transmission mode; the transceiver module 1201 is further configured to receive first channel information from a second terminal device, where the first channel information includes a channel matrix obtained by the second terminal device measuring CSI-RS; the processing module 1202 is further configured to determine a first precoding matrix according to the first channel information and second channel information obtained by measuring the CSI-RS by the first terminal device; the transceiver module 1201 is further configured to send the first precoding matrix to the second terminal equipment.

In some embodiments, when the first terminal device determines to send the first signal by using the codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device sends a second SRS to the network device, where 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. 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.

In some embodiments, the transceiver module 1201 is further configured to, before receiving the first indication information from the network device, send capability information to the network device, where the capability information is used to indicate that the first terminal device has a capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device.

In some embodiments, the transceiver module 1201 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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M.

All relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

In the embodiment of the present application, the first terminal device 120 is presented in a form of dividing each functional module in an integrated manner. A "module" herein may refer to a particular ASIC, an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that can provide the described functionality. In a simple embodiment, it will be appreciated by those skilled in the art that the first terminal device 120 may take the form of the communication apparatus 600 shown in fig. 6.

For example, the processor 601 in the communication apparatus 600 shown in fig. 6 may cause the communication apparatus 600 to execute the phase calibration method in the above-described method embodiment by calling the computer-executable instructions stored in the memory 603.

Specifically, the functions/implementation of the transceiver module 1201 and the processing module 1202 in fig. 12 may be implemented by the processor 601 in the communication apparatus 600 shown in fig. 6 invoking computer executable instructions stored in the memory 603. Alternatively, the functions/implementation of the processing module 1202 in fig. 12 may be implemented by the processor 601 in the communication apparatus 600 shown in fig. 6 calling computer-executable instructions stored in the memory 603, and the functions/implementation of the transceiver module 1201 in fig. 12 may be implemented by the communication interface 604 in the communication apparatus 600 shown in fig. 6.

Since the first terminal device 120 provided in the embodiment of the present application may perform the phase calibration method, the technical effects that can be obtained by the first terminal device may refer to the method embodiment described above, and will not be described herein.

Or, for example, taking a communication apparatus as an example of 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 may also be referred to as a transceiver unit for implementing a transceiver function, and may be, for example, a transceiver circuit, a transceiver, or a communication interface.

The processing module 1302 is configured to obtain first indication information, where the first indication information indicates that 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 is configured to send first indication information to a first terminal device.

In some embodiments, the transceiver module 1301 is further configured to send second indication information to the first terminal device, where the second indication information is used to instruct the first terminal device to send a first precoding matrix to the second terminal device, where the first precoding matrix determines, for the first terminal device, a precoding matrix corresponding to a first time when the first terminal device receives the CSI-RS from the network device in the case of sending the first signal using the non-codebook transmission mode.

In some embodiments, the processing module 1302 for obtaining the first indication information includes: receiving capability information from the first terminal device through the transceiver module 1301, where the capability information is used to instruct the first terminal device to have a capability of obtaining phase difference information and/or frequency offset information between the first terminal device and the second terminal device; first indication information is determined based on the capability information.

The transceiver module 1301 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, where M is a positive integer greater than 1. The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M.

In the present embodiment, the network device 130 is presented in a form that divides the respective functional modules in an integrated manner. A "module" herein may refer to a particular ASIC, an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that can provide the described functionality. In a simple embodiment, one skilled in the art will appreciate that the network device 130 may take the form of the communications apparatus 600 shown in fig. 6.

Specifically, the functions/implementation procedures of the transceiver module 1301 and the processing module 1302 in fig. 13 may be implemented by the processor 601 in the communication apparatus 600 shown in fig. 6 calling computer-executable instructions stored in the memory 603. Alternatively, the functions/implementation of the processing module 1302 in fig. 13 may be implemented by the processor 601 in the communication apparatus 600 shown in fig. 6 calling computer-executable instructions stored in the memory 603, and the functions/implementation of the transceiver module 1301 in fig. 13 may be implemented by the communication interface 604 in the communication apparatus 600 shown in fig. 6.

Since the network device 130 provided in this embodiment can execute the phase calibration method, the technical effects obtained by the method can be referred to the method embodiments described above, and will not be described herein.

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 are implemented in software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flows. The processor may be built in a SoC (system on a chip) or ASIC, or may be a separate semiconductor chip. The processor may further include necessary hardware accelerators, such as field programmable gate arrays (field programmable gate array, FPGAs), PLDs (programmable logic devices), or logic circuits implementing dedicated logic operations, in addition to the cores for executing software instructions for operation or processing.

When the above modules or units are implemented in hardware, the hardware may be any one or any combination of a CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, micro control unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, soC, FPGA, PLD, special purpose digital circuitry, hardware accelerator, or non-integrated discrete devices that may run the necessary software or that do not rely on software to perform the above method flows.

Optionally, embodiments of the present application further provide a communication device (for example, the communication device may be a chip or a chip system), where the communication device includes a processor, and the method is used to implement any of the method embodiments described above. In one possible design, the communication device further includes a memory. The memory for storing the necessary program instructions and data, and the processor may invoke the program code stored in the memory to instruct the communication device to perform the method of any of the method embodiments described above. Of course, the memory may not be in the communication device. When the communication device is a chip system, the communication device may be formed by 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 the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, a website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Although the present application has been described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the present application. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of phase calibration, the method comprising:

a first terminal device receives first indication information from a network device, wherein the first indication information indicates that 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 first terminal equipment receives a first SRS from the second terminal equipment on a time-frequency resource indicated by the first SRS resource configuration information according to the first indication information, and measures the first SRS to obtain phase difference information and/or frequency offset information between the first terminal equipment and the second terminal equipment, wherein the phase difference information and/or the frequency offset information is used for compensating phase difference and/or frequency offset corresponding to the first terminal equipment and the second terminal equipment when the first terminal equipment and the second terminal equipment send first signals.

2. The method of claim 1, wherein the phase difference between the first terminal device and the second terminal device when transmitting the first signal comprises a difference between a first phase difference and a second phase difference, the first phase difference being a phase difference between the first terminal device and the second terminal device at a first time, the second phase difference being a phase difference between the first terminal device and the second terminal device at a second time, wherein the first time is a channel state information CSI measurement time determined by the first terminal device, and the second time is a time when the first terminal device transmits the first signal to the network device.

3. The method according to claim 1 or 2, wherein the frequency offset corresponding to the time when the first terminal device and the second terminal device send the first signal includes a difference between a first frequency offset and a second frequency offset, the first frequency offset being a frequency offset between the first terminal device and the second terminal device at a first time, the second frequency offset being a frequency offset between the first terminal device and the second terminal device at a second time, wherein the first time is a CSI measurement time determined by the first terminal device, and the second time is a time when the first terminal device sends the first signal to the network device.

4. A method according to any of claims 1-3, wherein the first indication information comprises the first SRS resource configuration information, the first SRS resource configuration information comprising a usage indication user indicating that the first SRS resource configuration information is 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.

5. A method according to any one of claims 1-3, wherein the first indication information includes the first SRS resource configuration information, and a symbol type corresponding to time domain resource information included in the first SRS resource configuration information is a downlink symbol.

6. The method according to any of claims 2-5, wherein in case the first terminal device determines to send the first signal using a non-codebook transmission scheme, the CSI measurement instant determined by the first terminal device is the instant when the first terminal device receives a channel state information reference signal CSI-RS from the network device.

7. The method according to any one of claims 1-6, further comprising:

the first terminal equipment receives second indication information from the network equipment, wherein the second indication information is used for indicating the first terminal equipment to send a first precoding matrix to the second terminal equipment, and the first precoding matrix determines a precoding matrix corresponding to the first moment when the first terminal equipment sends the first signal by using a non-codebook transmission mode;

the first terminal equipment receives first channel information from the second terminal equipment, wherein the first channel information comprises a channel matrix obtained by measuring the CSI-RS by the second terminal equipment;

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

And the first terminal equipment sends the first precoding matrix to the second terminal equipment.

8. The method according to any one of claims 2-5, wherein, in a case where the first terminal device determines to transmit the first signal using a codebook transmission manner, the CSI measurement time determined by the first terminal device is a time when the first terminal device transmits a second SRS to the network device, where the second SRS is used for CSI measurement of an uplink channel; or the CSI measurement time determined by the first terminal device is a time when the second terminal device sends a third SRS to the network device, where 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 an uplink channel.

9. The method according to any of claims 1-8, wherein before the first terminal device receives the first indication information from the network device, the method further comprises:

the first terminal equipment receives third indication information from the network equipment, wherein the third indication information indicates that M pieces of SRS resource configuration information received by the first terminal equipment are candidate SRS resource configuration information used for phase calibration between the first terminal equipment and other terminal equipment, and M is a positive integer greater than 1;

The first indication information is further used for indicating that N pieces of SRS resource configuration information in the M pieces of SRS resource configuration information are the first SRS resource configuration information, and N is a positive integer smaller than or equal to M.

10. The method according to any of claims 1-9, wherein before the first terminal device receives the first indication information from the network device, the method further comprises:

the first terminal equipment sends capability information to the network equipment, wherein the capability information is used for indicating that the first terminal equipment has the capability of acquiring phase difference information and/or frequency offset information between the first terminal equipment and other terminal equipment.

11. A method of phase calibration, the method comprising:

the network equipment acquires first indication information, wherein the first indication information indicates that 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 network equipment sends the first indication information to the first terminal equipment.

12. The method of claim 11, wherein the first indication information comprises the first SRS resource configuration information including a usage indication user indicating that the first SRS resource configuration information is 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.

13. The method of claim 11, wherein the first indication information comprises the first SRS resource configuration information, and wherein a symbol type corresponding to time domain resource information included in the first SRS resource configuration information is a downlink symbol.

14. The method according to any one of claims 11-13, further comprising:

the network device sends second indication information to the first terminal device, where the second indication information is used to indicate the first terminal device to send a first precoding matrix to the second terminal device, where the first precoding matrix determines, for the first terminal device, a precoding matrix corresponding to a first time when the first terminal device sends a first signal by using a non-codebook transmission mode, and the first time is a time when the first terminal device receives a channel state information reference signal CSI-RS from the network device.

15. The method according to any of claims 11-14, wherein the network device obtaining the first indication information comprises:

the network equipment receives capability information from the first terminal equipment, wherein the capability information is used for indicating that the first terminal equipment has the capability of acquiring phase difference information and/or frequency offset information between the first terminal equipment and other terminal equipment;

The network device determines the first indication information according to the capability information.

16. The method according to any of claims 11-15, wherein before the network device sends the first indication information to the first terminal device, the method further comprises:

the network device sends third indication information to the first terminal device, wherein the third indication information indicates that 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;

17. A communication device for performing the phase calibration method according to any of claims 1-10.

18. A communication device for performing the phase calibration method according to any of claims 11-16.

19. A communication device, comprising:

A processor coupled to the memory;

the processor configured to execute a computer program stored in the memory to cause the communication device to perform the phase calibration method according to any one of claims 1-16.

20. A communication device, comprising:

a processor and interface circuit; wherein,

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor is configured to execute the code instructions to perform the phase calibration method of any one of claims 1-16.

21. A communication device comprising a processor and a transceiver for information interaction between the communication device and other communication devices, the processor executing program instructions for performing the phase calibration method of any of claims 1-16.

22. A computer readable storage medium, characterized in that the computer readable storage medium comprises a computer program or instructions which, when run on a computer, cause the computer to perform the phase calibration method according to any one of claims 1-16.