Communication method and communication apparatus

Abstract

The present application provides a communication method and a communication apparatus. In the method, a first apparatus can acquire one or more first phase differences between downlink measurement channels of a first TRP and a second TRP by receiving a first channel state information report reported by a terminal; and then, determine a second phase difference between the uplink measurement channels of the first TRP and the second TRP, and determine a phase calibration coefficient between the first TRP and the second TRP on the basis of the first phase differences and the second phase difference. Thus, when each TRP next transmits a downlink reference signal or receives an uplink reference signal, the transmission or reception phase of the TRP is adjusted on the basis of the phase calibration coefficient, thereby facilitating achievement of reciprocity correction between the TRPs without imposing constraints on TRP hardware specifications, helping to improve data transmission performance. Moreover, the first channel state information report reported by the terminal only needs to carry phase-related information (such as the first phase differences), helping to reduce feedback overhead.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on April 3, 2024, with application number 202410407164.X, and priority to the Chinese patent application entitled “A Communication Method and Communication Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a communication method and a communication device. Background Art

[0003] In a coherent joint transmission (CJT) scenario, multiple transmission reception points (TRPs) can jointly transmit the physical downlink shared channel (PDSCH) to a terminal (e.g., user equipment (UE)). For example, assuming two stations (e.g., TRP1 and TRP2) collaborate, to ensure reciprocity of the uplink and downlink channels, TRP1 and TRP2 must not only perform reciprocity calibration for each antenna port within the TRP, but also perform reciprocity calibration for each antenna port between TRPs. However, the channel dimensions between different stations are usually different. For example, assume that the channels through which TRP1 and TRP2 send PDSCH include H1 and H2; among them, the channel dimension of H1 corresponding to TRP1 to UE is Tx1*Rx, and the channel dimension of H2 corresponding to TRP2 to UE is Tx2*Rx, while the channel dimension of the equivalent channel H for sending PDSCH by multiple stations is (Tx1+Tx2)*Rx. Due to the different multiplicative coefficients between different stations, how to support joint reciprocity correction between TRPs in the scenario of CJT collaboration among multiple TRPs becomes a problem to be solved. Summary of the Invention

[0004] The present application provides a communication method and a communication device, which assist the base station in performing reciprocity correction between multiple TRPs through terminal measurement feedback, which is beneficial to improving data transmission performance and reducing feedback overhead.

[0005] In a first aspect, the present application provides a communication method, which is applied to a first device. For example, the first device can be a network device (such as a satellite, a base station, a TRP, etc.), or a component of a network device (such as a processor, a chip, or a chip system, etc.), or a logic module that can implement all or part of the network device functions. The first device receives a first channel state information report, which includes a first phase difference between a first downlink measurement channel of a first TRP and a second downlink measurement channel of a second TRP; the first downlink measurement channel is determined by a first downlink reference signal, and the first downlink reference signal corresponds to the first TRP; the second downlink measurement channel is determined by a second downlink reference signal, and the second downlink reference signal corresponds to the second TRP. The first device determines a second phase difference between a first uplink measurement channel of the first TRP and a second uplink measurement channel of the second TRP; the first uplink measurement channel is determined by an uplink reference signal received by the first TRP; the second uplink measurement channel is determined by an uplink reference signal received by the second TRP. The first device determines a phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference.

[0006] In this method, the first device can obtain the first phase difference between the downlink measurement channels of the first TRP and the second TRP by receiving the first channel state information report reported by the terminal; then determine the second phase difference between the uplink measurement channels of the first TRP and the second TRP, and determine the phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference, so that when the TRP sends a downlink reference signal or receives an uplink reference signal next time, the phase of the TRP sent or received is adjusted based on the phase calibration coefficient, which is conducive to achieving reciprocity correction between TRPs without limiting the hardware specifications of the TRP, and is conducive to improving data transmission performance. In addition, the first channel state information report reported by the terminal only needs to carry phase-related information (such as the first phase difference), which is conducive to reducing feedback overhead.

[0007] In one possible implementation, the antenna port for sending the first downlink reference signal by the first TRP is the same as the antenna port for receiving the uplink reference signal.

[0008] In one possible implementation, the resources of the first downlink reference signal are associated with the resources of the uplink reference signal, and the resources of the second downlink reference signal are associated with the resources of the uplink reference signal. For example, the resource identifier (e.g., ResourceSet ID) of the first downlink reference signal is associated with the ResourceSet ID of the uplink reference signal.

[0009] In the above embodiment, the resources of the downlink reference signal sent by the TRP are associated with the resources of the received uplink reference signal, which is beneficial for the first device to perform terminal-assisted uplink and downlink reciprocity calibration.

[0010] In a possible implementation, the first channel state information report is associated with an uplink reference signal resource.

[0011] In this embodiment, the first device can also configure the first channel state information report to be associated with the resources of the uplink reference signal, for example, configuring the antenna port for the terminal to receive the first downlink reference signal to be the same as the antenna port for sending the uplink reference signal, which is beneficial for the first device to perform terminal-assisted uplink and downlink reciprocity calibration.

[0012] In one possible implementation, the second TRP is a reference TRP.

[0013] In this embodiment, the reference TRP may be predefined, for example, the base station pre-designates the second TRP among multiple TRPs as the reference TRP, thereby determining the phase difference between the reference TRP and the other TRPs based on the reference TRP. Alternatively, the reference TRP may be determined by the terminal, for example, the terminal may receive downlink reference signals from multiple TRPs and select the TRP with the largest reference signal receiving power (RSRP) as the reference TRP, which is beneficial for the terminal to determine the phase difference between the reference TRP and the other TRPs based on the reference TRP.

[0014] In one possible implementation, the first channel state information report is a wideband report, and the first channel state information report corresponds to a first phase difference. For example, the first channel state information report is wideband reporting, has low reporting overhead, and the reporting amount itself is independent of the frequency of the reference signal. For example, the reference signal may correspond to multiple frequency domain units, but the multiple frequency domain units correspond to the same channel state information report.

[0015] In one possible implementation, the first channel state information report is a subband report, and the first channel state information report corresponds to multiple first phase differences. For example, the reference signal may correspond to multiple frequency domain units, each frequency domain unit corresponding to a first phase difference, or the first channel state information report may include multiple first phase differences, each first phase difference corresponding to a frequency domain unit.

[0016] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold, wherein the quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; and the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

[0017] In a possible implementation, the first threshold is 2π, and the second threshold is π.

[0018] In the above embodiment, the first phase difference can be quantized using different thresholds and quantization ranges corresponding to different thresholds. For example, if the first threshold is used, the quantized value of the first phase difference can be within the range of 0 to 2π, or if the second threshold is used, the quantized value of the first phase difference can be within the range of -π to π, which is beneficial for the first device to perform phase adjustment.

[0019] For example, the first threshold is denoted as φ MAX , the number of quantization bits is M, then the quantization step size is The quantization range is [0,φ MAX ), the decimal representation of the M bits contained in the first channel state information report is m, m∈{0,1,…,2 M -1}, if and only if the first phase difference φ n satisfy That is, it falls into the quantitative range For another example, the second threshold is expressed as φ MAX , the number of quantization bits is M, then the quantization step size is The quantization range is [-φ MAX ,φ MAX ), the decimal representation of the M bits contained in the first channel state information report is m, m∈{0,1,…,2 M -1}, if and only if the first phase difference φ n satisfy For example, assuming that the first threshold φ MAX =2π, when M=3, we can find that the quantization range is divided into 2 3 = 8 intervals, and the quantization step size is 2π / 8 = π / 4. Then the 8 quantization intervals are [0, π / 4), [π / 4, π / 2), …, [7π / 4, 2π). Optionally, each quantization interval can correspond to M bits. For example, the quantization interval [0, π / 4) corresponds to bits 000 (corresponding to decimal 0), the bits corresponding to [π / 4, π / 2) are 001 (corresponding to decimal 1), and so on. The bits corresponding to [7π / 4, 2π) are 111 (corresponding to decimal 8). Using different bit values ​​can indicate different quantization intervals, thereby indicating the corresponding phase difference.

[0020] In the second aspect, the present application provides a communication method, which is applied to a second device. For example, the second device can be a terminal, or a terminal or a communication module in the terminal, or a circuit or chip in the terminal responsible for the communication function (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system in package (SIP) chip containing a modem core). The second device receives a first downlink reference signal and a second downlink reference signal, and estimates the first downlink measurement channel of the first TRP based on the first downlink reference signal, and estimates the second downlink measurement channel of the second TRP based on the second downlink reference signal. The second device sends a first channel state information report to the first TRP, and the first channel state information report includes a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0021] In this method, a second device can receive downlink reference signals from different TRPs and perform channel estimation based on the downlink reference signals of the different TRPs to obtain downlink measurement channels of the different TRPs, thereby obtaining a first phase difference between the downlink measurement channels of the different TRPs. Furthermore, the second device can report the first phase difference to the base station, which helps assist the base station in performing reciprocity correction between TRPs and improves data transmission performance.

[0022] In one possible implementation, the second TRP is a reference TRP.

[0023] In one possible implementation, the second device receives N downlink reference signals and determines a TRP with the largest RSRP among the N downlink reference signals as a reference TRP. Optionally, the N downlink reference signals may include a first downlink reference signal and a second downlink reference signal, or may not include the first downlink reference signal or the second downlink reference signal.

[0024] In the above embodiment, the reference TRP may be determined by the terminal. For example, the terminal may receive N downlink reference signals from multiple TRPs and select the TRP with the largest RSRP as the reference TRP, which is beneficial for the terminal to determine the phase difference between the reference TRP and other TRPs based on the reference TRP. Optionally, the reference TRP may also be predefined by the base station. For example, the base station pre-designates the second TRP among multiple TRPs as the reference TRP, and the predefined information is known to both the base station and the terminal (it may be pre-configured or indicated by the base station to the terminal, which is not limited in this application).

[0025] In one possible implementation, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal; the antenna port through which the terminal receives the second downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal.

[0026] In a possible implementation manner, resources of the first downlink reference signal are associated with resources of the uplink reference signal; and resources of the second downlink reference signal are associated with resources of the uplink reference signal.

[0027] In the above embodiment, the resources of the downlink reference signal received by the terminal are associated with the resources of the uplink reference signal sent. For example, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the uplink reference signal is sent, which is beneficial for the terminal to assist the base station in performing uplink and downlink reciprocity calibration.

[0028] In a possible implementation, the first channel state information report is associated with an uplink reference signal resource.

[0029] In this implementation, the base station may further configure the terminal to associate the first channel state information report with uplink reference signal resources, which is beneficial for the terminal to assist the base station in performing uplink and downlink reciprocity calibration.

[0030] In a possible implementation, the first channel state information report is a broadband report, and the first channel state information report corresponds to a first phase difference.

[0031] In a possible implementation, the first channel state information report is a sub-band report, and the first channel state information report corresponds to multiple first phase differences.

[0032] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold, wherein the quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; and the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

[0033] In a possible implementation, the first threshold is 2π, and the second threshold is π.

[0034] In the above embodiment, the first phase difference can be quantized using different thresholds and quantization ranges corresponding to different thresholds. For example, if the first threshold is used, the quantized value of the first phase difference can be within the range of 0 to 2π, or if the second threshold is used, the quantized value of the first phase difference can be within the range of -π to π, which is beneficial for the terminal to assist the base station in phase adjustment.

[0035] In a third aspect, the present application provides a communication method, which is applied to a second device. For example, the second device can be a terminal, or a terminal or a communication module in the terminal, or a circuit or chip in the terminal responsible for the communication function (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system in package (SIP) chip containing a modem core). The second device sends an uplink reference signal; the uplink reference signal is used for the first TRP to determine the first uplink measurement channel, or the uplink reference signal is used for the second TRP to determine the second uplink measurement channel; the first uplink measurement channel is used to precode the first downlink reference signal; the second uplink measurement channel is used to precode the second downlink reference signal. The second device receives the first downlink reference signal and the second downlink reference signal, and estimates the first downlink measurement channel of the first TRP based on the first downlink reference signal; and estimates the second downlink measurement channel of the second TRP based on the second downlink reference signal. The second device sends a first channel state information report to the first TRP, and the first channel state information report includes a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0036] In this method, the second device can send an uplink reference signal to different TRPs, so that different TRPs can estimate their own uplink measurement channels based on the uplink reference signal. Different TRPs can precode the downlink reference signal based on their own uplink measurement channels, which is beneficial for the second device to determine the reference TRP based on the precoded first downlink reference signal and / or second downlink reference signal. In addition, the second device performs channel estimation based on the downlink reference signals of different TRPs to obtain downlink measurement channels of different TRPs, thereby obtaining the first phase difference between the downlink measurement channels of different TRPs. The second device can report the first phase difference to the base station, which is beneficial for assisting the base station to perform reciprocity correction between TRPs and improve data transmission performance.

[0037] In one possible implementation, the second TRP is a reference TRP.

[0038] In one possible implementation, the second device receives N downlink reference signals and determines a TRP with the largest RSRP among the N downlink reference signals as a reference TRP. Optionally, the N downlink reference signals may include a first downlink reference signal and a second downlink reference signal, or may not include the first downlink reference signal or the second downlink reference signal.

[0039] In the above embodiment, the reference TRP may be determined by the terminal. For example, the terminal may receive N downlink reference signals from multiple TRPs and select the TRP with the largest RSRP as the reference TRP, which is beneficial for the terminal to determine the phase difference between the reference TRP and other TRPs based on the reference TRP. Optionally, the reference TRP may also be predefined by the base station. For example, the base station pre-designates the second TRP among multiple TRPs as the reference TRP, and the predefined information is known to both the base station and the terminal (it may be pre-configured or indicated by the base station to the terminal, which is not limited in this application).

[0040] In one possible implementation, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal; the antenna port through which the terminal receives the second downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal.

[0041] In a possible implementation manner, resources of the first downlink reference signal are associated with resources of the uplink reference signal; and resources of the second downlink reference signal are associated with resources of the uplink reference signal.

[0042] In the above embodiment, the resources of the downlink reference signal received by the terminal are associated with the resources of the uplink reference signal sent. For example, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the uplink reference signal is sent, which is beneficial for the terminal to assist the base station in performing uplink and downlink reciprocity calibration.

[0043] In a possible implementation, the first channel state information report is associated with an uplink reference signal resource.

[0044] In this implementation, the base station may further configure the terminal to associate the first channel state information report with uplink reference signal resources, which is beneficial for the terminal to assist the base station in performing uplink and downlink reciprocity calibration.

[0045] In a possible implementation, the first channel state information report is a broadband report, and the first channel state information report corresponds to a first phase difference.

[0046] In a possible implementation, the first channel state information report is a sub-band report, and the first channel state information report corresponds to multiple first phase differences.

[0047] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold, wherein the quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; and the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

[0048] In a possible implementation, the first threshold is 2π, and the second threshold is π.

[0049] In the above embodiment, the first phase difference can be quantized using different thresholds and quantization ranges corresponding to different thresholds. For example, if the first threshold is used, the quantized value of the first phase difference can be within the range of 0 to 2π, or if the second threshold is used, the quantized value of the first phase difference can be within the range of -π to π, which is beneficial for the terminal to assist the base station in phase adjustment.

[0050] In a fourth aspect, the present application provides a communication device. The communication device is a network-side device, for example, a network device, or a component of a network device (such as a processor, a chip, or a chip system, etc.), or a device that can be used in conjunction with a network device. In one possible implementation, the communication device has the function of implementing the above-mentioned first aspect. For example, the communication device includes a module or unit or means corresponding to the operation involved in the above-mentioned first aspect. The module or unit or means can be implemented specifically through software, or through hardware, or through a combination of software and hardware.

[0051] In one possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is configured to receive a first channel state information report, the first channel state information report including a first phase difference between a first downlink measurement channel of a first TRP and a second downlink measurement channel of a second TRP; the first downlink measurement channel is determined by a first downlink reference signal, the first downlink reference signal corresponds to the first TRP; the second downlink measurement channel is determined by a second downlink reference signal, the second downlink reference signal corresponds to the second TRP. The processing unit is configured to determine a second phase difference between a first uplink measurement channel of the first TRP and a second uplink measurement channel of the second TRP; the first uplink measurement channel is determined by an uplink reference signal received by the first TRP; the second uplink measurement channel is determined by an uplink reference signal received by the second TRP. The processing unit is further configured to determine a phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference.

[0052] In this embodiment, the communication device can obtain the first phase difference between the downlink measurement channels of the first TRP and the second TRP by receiving the first channel state information report reported by the terminal; then determine the second phase difference between the uplink measurement channels of the first TRP and the second TRP, and determine the phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference, so that when the TRP sends a downlink reference signal or receives an uplink reference signal next time, the phase of the TRP sent or received is adjusted based on the phase calibration coefficient, which is conducive to achieving reciprocity correction between TRPs without limiting the hardware specifications of the TRP, and is conducive to improving data transmission performance.

[0053] Optionally, other possible implementations in the fourth aspect can refer to the corresponding descriptions of other possible implementations in the first aspect, and will not be repeated here.

[0054] In a fifth aspect, the present application provides a communication device. The communication device is a terminal-side device, for example, a terminal, or a component of a terminal (such as a processor, a chip, or a chip system, etc.), or a device that can be used in conjunction with a terminal. In one possible implementation, the communication device has the function of implementing the second or third aspect above. For example, the communication device includes a module or unit or means corresponding to the operation involved in the second or third aspect above. The module or unit or means can be implemented by software, or by hardware, or by a combination of software and hardware.

[0055] In one possible embodiment, the communication device includes a communication unit and a processing unit. The communication unit is configured to receive a first downlink reference signal and a second downlink reference signal. The processing unit is configured to estimate a first downlink measurement channel for a first TRP based on the first downlink reference signal, and to estimate a second downlink measurement channel for a second TRP based on the second downlink reference signal. The communication unit is further configured to send a first channel state information report to the first TRP, the first channel state information report including a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0056] In this embodiment, the communication device can receive downlink reference signals from different TRPs and perform channel estimation based on the downlink reference signals of the different TRPs to obtain downlink measurement channels of the different TRPs, thereby obtaining a first phase difference between the downlink measurement channels of the different TRPs. Furthermore, the communication device can report the first phase difference to the base station, which is beneficial for assisting the base station in performing reciprocity correction between TRPs and improving data transmission performance.

[0057] Optionally, other possible implementations can refer to the corresponding descriptions of other possible implementations in the second aspect, which will not be repeated here.

[0058] In one possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is used to send an uplink reference signal; the uplink reference signal is used for the first TRP to determine a first uplink measurement channel, or the uplink reference signal is used for the second TRP to determine a second uplink measurement channel; the first uplink measurement channel is used to precode the first downlink reference signal; and the second uplink measurement channel is used to precode the second downlink reference signal. The communication unit is also used to receive the first downlink reference signal and the second downlink reference signal. The processing unit is used to estimate the first downlink measurement channel of the first TRP based on the first downlink reference signal; and to estimate the second downlink measurement channel of the second TRP based on the second downlink reference signal. The communication unit is also used to send a first channel state information report to the first TRP, the first channel state information report including a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0059] In this embodiment, the communication device can send uplink reference signals to different TRPs, so that different TRPs can estimate their own uplink measurement channels based on the uplink reference signals. Different TRPs can precode downlink reference signals based on their own uplink measurement channels, which is conducive to determining the reference TRP based on the precoded first downlink reference signal and / or second downlink reference signal. In addition, the communication device performs channel estimation based on the downlink reference signals of different TRPs to obtain downlink measurement channels of different TRPs, thereby obtaining a first phase difference between the downlink measurement channels of different TRPs. The communication device can report the first phase difference to the base station, which is conducive to assisting the base station in performing reciprocity correction between TRPs and improving data transmission performance.

[0060] Optionally, other possible implementations can refer to the corresponding descriptions of other possible implementations in the third aspect, which will not be repeated here.

[0061] In a sixth aspect, the present application provides a communication device comprising: a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices and transmit them to the processor or to send signals from the processor to other communication devices, the processor being used to implement at least one of the following through logic circuits or execution code instructions: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect, and the method in the third aspect and any possible implementation of the third aspect.

[0062] In a seventh aspect, the present application provides a communication device comprising a memory and one or more processors. The memory is used to store part or all of the necessary computer programs or instructions for implementing the functions involved in at least one of the first aspect, the second aspect, or the third aspect. One or more processors can execute the computer program or instructions. When the computer program or instructions are executed, the communication device implements at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect, and the method in the third aspect and any possible implementation of the third aspect. Optionally, the memory and the processor are decoupled.

[0063] In one possible design, the communication device may further include an interface circuit, wherein the processor is configured to communicate with other devices or components through the interface circuit.

[0064] In one possible design, the communication device may further include a memory.

[0065] In one possible design, the communication device may be a terminal, or a communication module in a terminal, or a chip in the terminal responsible for communication functions such as a modem chip or a SoC or SIP chip including a modem module.

[0066] In an eighth aspect, the present application provides a communication system, which includes at least one device or equipment among the fourth to seventh aspects above, so that the at least one device or equipment above performs at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect, and the method in the third aspect and any possible implementation of the third aspect.

[0067] In a ninth aspect, the present application provides a computer-readable storage medium storing instructions, which, when executed on a computer, causes the computer to execute at least one of the following: the method of the first aspect and any possible implementation of the first aspect, the method of the second aspect and any possible implementation of the second aspect, and the method of the third aspect and any possible implementation of the third aspect.

[0068] In a tenth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, cause the computer to execute at least one of the following: the method of the first aspect and any possible implementation of the first aspect, the method of the second aspect and any possible implementation of the second aspect, and the method of the third aspect and any possible implementation of the third aspect.

[0069] In the eleventh aspect, the present application provides a chip, which includes a processor (or logic circuit). Optionally, the chip may also include a communication interface (or interface) for implementing at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect. In one possible implementation, if the chip is the smallest processing unit in the entire machine, the chip may be a processor, or may include a processor and a memory, or may include a processor, a memory and a transceiver, for implementing at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect, the method in the third aspect and any possible implementation of the third aspect.

[0070] In a twelfth aspect, the present application provides a chip system. The chip system includes a processor and an interface. Optionally, it may also include a memory for implementing at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect, and the method in the third aspect and any possible implementation of the third aspect. The chip system may be composed of a chip, or may include a chip and other discrete components. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a network architecture provided by this application;

[0072] FIG2 is a schematic diagram of an uplink channel and a downlink channel of a single TRP serving a UE;

[0073] FIG3 is a schematic diagram of multiple uplink channels and downlink channels of a multi-TRP serving UE;

[0074] FIG4 is a flow chart of a communication method provided by the present application;

[0075] FIG5 is a flow chart of another communication method provided by the present application;

[0076] FIG6 is a schematic diagram of a communication device provided by the present application;

[0077] FIG7 is a schematic diagram of another communication device provided in this application. DETAILED DESCRIPTION

[0078] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0079] For ease of understanding, the following is a detailed introduction to the definitions of relevant terms involved in this application:

[0080] 1. Network architecture: For example, the communication method provided in this application can be applied to the network architecture shown in Figure 1. The network architecture 100 shown in Figure 1 includes network devices (network devices 110a-110c as shown in Figure 1) and terminals (terminals 120a-120g as shown in Figure 1). It will be understood that Figure 1 is only an example and only shows some devices (for example, more terminals and / or network devices may be included, and the form of the terminal and / or network device may not be limited to the form shown in the figure, etc.). This application does not limit the network architecture to which the communication method is applied.

[0081] Among them, the communication method provided in this application can be applied to the integration of traditional mobile communication systems. For example, the mobile communication system can be a fourth-generation (4G) communication system (for example, a long-term evolution (LTE) system), a world-wide interoperability for microwave access (WiMAX) communication system, a fifth-generation (5G) communication system (for example, a new radio (NR) system), and future mobile communication systems; it can also be applied to satellite communication systems, high altitude platform station (HAPS) communications, UAVs and other NTN systems, such as integrated communication and navigation (IcaN) systems, global navigation satellite systems (GNSS) and ultra-dense low-orbit satellite communication systems.

[0082] Among them, the network device is a device with wireless transceiver functions, which is used to communicate with the terminal device. For example, the network device is a radio access network (RAN) node that connects the terminal device to the wireless network. The network device in this application may include but is not limited to: an evolved node B (eNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission reception point (TRP), etc. The network device can also be a gNB or TRP or TP in a 5G system, or one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system, or a network controlled repeater (NCR), or an integrated access and backhaul (IAB) node. In addition, the network device can also be a network node constituting a gNB or TP, such as a BBU, or a distributed unit (DU), etc. Alternatively, the network device may also be a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT), an Internet of Vehicles communication system, or a device or satellite that performs network-side functions in other communication systems.

[0083] A terminal is a device with wireless transceiver capabilities that can send signals to network devices or receive signals from network devices. The terminals mentioned in this application include various handheld devices with wireless communication capabilities, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. Specifically, they can refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in telemedicine (remote medical), a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a 5G network or a future communication network, etc.

[0084] Network devices and terminals can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; and on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of network devices and terminals.

[0085] In this application, the functions of the network device can also be performed by a module (such as a chip) in the network device, or by a control subsystem that includes the network device function. The control subsystem that includes the network device function here can be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal can also be performed by a module (such as a chip or modem) in the terminal, or by a device that includes the terminal function.

[0086] In this application, a network device sends downlink signals or downlink information to a terminal, and the downlink information is carried on a downlink channel. The terminal sends uplink signals or uplink information to the network device, and the uplink information is carried on an uplink channel. In order to communicate with the network device, the terminal needs to establish a wireless connection to the cell controlled by the network device. The cell with which the terminal has established a wireless connection is called the serving cell of the terminal. When the terminal communicates with the serving cell, it will also be subject to interference from signals in neighboring cells.

[0087] 2. Uplink and downlink channel reciprocity: Assuming that in a scenario where a single TRP serves a UE, the uplink signal generated by the UE will experience a multiplication coefficient when it is sent to the transmission medium (such as air) on the UE side. After the signal has undergone the channel response, it will experience the multiplication coefficient at the base station side. The downlink signal generated by the base station is sent to the transmission medium at the base station side and undergoes a multiplication coefficient. After experiencing the channel response, the UE side will experience the multiplication coefficient Among them, according to the reciprocity principle, the uplink and downlink channel responses can be obtained by Direct transformation is obtained, but if and Different, the channel will not have reciprocity, that is: there is a deviation in the amplitude and phase of the uplink and downlink, resulting in the inability to directly obtain the downlink (DL) channel through the uplink (UL). and Different channels will also lead to the lack of reciprocity. In order to ensure the reciprocity of the channel, the UE and the base station need to perform reciprocity calibration to ensure that and Same as and same.

[0088] For example, Figure 2 is a schematic diagram of the uplink channel and downlink channel of a single TRP serving UE. For UL transmission, the channel response needs to be multiplied by the UE side transmission coefficient, such as They correspond to the transmission coefficients of each transmitting antenna of the UE, and also need to be multiplied by the base station side receiving coefficients, such as They correspond to the receiving coefficients of each receiving antenna of the base station. Similarly, for DL ​​transmission, the channel response needs to be multiplied by the UE side receiving coefficient on the left and the base station side sending coefficient on the right. In order to ensure the reciprocity of the uplink and downlink channels, and The difference is solved by terminal-side reciprocity correction; and The difference is solved by TRP self-calibration, that is, the base station side needs to obtain its own The base station side can take the value of The value of is used to adjust the amplitude and phase of the received channel to ensure reciprocity.

[0089] However, if the scenario of multiple TRPs performing CJT is considered, multiple TRPs can jointly send PDSCH to the UE. For example, Figure 3 is a schematic diagram of multiple uplink channels and downlink channels of a UE served by multiple TRPs. Assuming that two stations (such as TRP1 and TRP2) collaborate, the channel experienced by PDSCH can be understood as: H = [H1 H2]; among them, H1 corresponds to the channel dimension from TRP1 to UE is Tx1*Rx, H2 corresponds to the channel dimension from TRP2 to UE is Tx2*Rx, and the channel dimension of the equivalent channel H for sending PDSCH by multiple stations is (Tx1+Tx2)*Rx. Usually, the multiplication coefficients between different stations are different, and the impact on reciprocity includes: correction within TRP (such as TRP1 to obtain its own The value of TRP2 is to obtain its own Based on the value of ), additional TRP correction is required (such as obtaining and relative relationship), so the reciprocity is also valid for H; therefore, how to support the joint reciprocity correction between TRPs in the scenario where multiple TRPs perform CJT collaboration becomes a problem to be solved. In order to solve the above problems, the present application provides a communication method, which assists the base station in performing reciprocity correction between multiple TRPs by means of terminal measurement feedback, which is beneficial to improving data transmission performance and reducing feedback overhead.

[0090] For example, Figure 4 is a flow chart of a communication method provided by this application. The method is implemented by interaction between a first device and a second device. For example, the first device can be a network-side device, such as a base station, TRP, etc., or a component thereof, and the second device can be a terminal-side device, such as a terminal or chip. The method includes the following steps:

[0091] S101, the second device sends a first channel state information report, the first channel state information report includes one or more first phase differences between the first downlink measurement channel of the first TRP and the second downlink measurement channel of the second TRP; correspondingly, the first device receives the first channel state information report.

[0092] In one possible implementation, the first downlink measurement channel is determined by a first downlink reference signal, and the first downlink reference signal corresponds to a first TRP. For example, the first downlink reference signal corresponds to the first TRP, indicating that the first downlink reference signal comes from the first TRP, that is, the first TRP sends the first downlink reference signal to the second device. The first downlink measurement channel is determined by the first downlink reference signal, which means that after the second device receives the first downlink reference signal, it can perform channel estimation based on the first downlink reference signal, and obtain a channel estimation result including the first downlink measurement channel. Optionally, the first downlink measurement channel may include parameters such as the amplitude and phase of the downlink RF link of the first TRP, and the amplitude and phase of the downlink channel between the first TRP and the terminal.

[0093] In one possible implementation, the second downlink measurement channel is determined by a second downlink reference signal, and the second downlink reference signal corresponds to a second TRP. For example, similar to the definition of the first downlink reference signal, the second downlink reference signal corresponds to the second TRP, indicating that the second downlink reference signal comes from the second TRP, that is, the second TRP sends the second downlink reference signal to the second device. The second downlink measurement channel is determined by the second downlink reference signal, which means that after the second device receives the second downlink reference signal, it can perform channel estimation based on the second downlink reference signal, and the channel estimation result obtained includes the second downlink measurement channel. Optionally, the second downlink measurement channel may include parameters such as the amplitude and phase of the downlink RF link of the second TRP, and the amplitude and phase of the channel between the second TRP and the terminal.

[0094] Optionally, the first downlink reference signal or the second downlink reference signal is a downlink reference signal such as a channel state information reference signal (CSI-RS) or a tracking reference signal (TRS).

[0095] In one possible implementation, the second device may receive N downlink reference signals from N TRPs, which may include a first TRP and a second TRP. Furthermore, the N TRPs include a reference TRP and other N-1 TRPs. The reference TRP is used for other TRPs to analyze the phase difference of the uplink measurement channel or the phase difference of the downlink measurement channel between the reference TRP, thereby facilitating phase calibration of other TRPs, thereby achieving reciprocity calibration between TRPs. The reference TRP may be predefined, for example, the base station pre-designates the second TRP among multiple TRPs as the reference TRP, thereby determining the phase difference between the reference TRP and other TRPs (such as the first phase difference between the first TRP and the second TRP) based on the reference TRP. For example, the terminal may receive N downlink reference signals from N TRPs, which include N-1 downlink reference signals of N-1 TRPs, and a downlink reference signal of the reference TRP. The terminal can perform channel estimation based on the N-1 downlink reference signals of the N-1 TRPs and the downlink reference signals of the reference TRP to obtain the downlink measurement channels of the N-1 TRPs and the downlink measurement channels of the reference TRP. Assume that the i-th downlink measurement channel (the i-th downlink measurement channel is any one of the downlink measurement channels of the N-1 TRPs) is as shown in formula (1), and the downlink measurement channel of the reference TRP is as shown in formula (2):

[0096] in, Indicates the downlink measurement channel of the i-th TRP, 0 <i≤N,i≠nref; represents the amplitude of the downlink RF link of the i-th TRP, represents the phase of the downlink RF link of the i-th TRP, |h i | represents the amplitude of the downlink channel between the i-th TRP and the terminal, Represents the phase of the downlink channel between the i-th TRP and the terminal. Indicates the downlink measurement channel of the reference TRP, represents the amplitude of the downlink RF link referenced to TRP, represents the phase of the downlink RF link referenced to TRP, |h nref | represents the amplitude of the channel between the reference TRP and the terminal, Indicates the phase of the channel between the reference TRP and the terminal.

[0097] Optionally, the second device receives N downlink reference signals, which may not include the first downlink reference signal and the second downlink reference signal. For example, the second device first receives N downlink reference signals, then receives the first downlink reference signal and the second downlink reference signal, and then performs channel estimation based on the first downlink reference signal or the second downlink reference signal to obtain the first downlink measurement channel or the second downlink measurement channel.

[0098] In one possible implementation, the second device can obtain the phase difference between the downlink measurement channels of N-1 TRPs and the downlink measurement channel of the reference TRP based on the downlink measurement channels of N-1 TRPs and the downlink measurement channel of the reference TRP, as shown in formula (3):

[0099] Among them, α i Represents the phase difference between the downlink measurement channel of the i-th TRP and the downlink measurement channel of the reference TRP.

[0100] Optionally, the second device determines the first phase difference between the first downlink measurement channel of the first TRP and the second downlink measurement channel of the second TRP, and may also adopt the method shown in formula (3). For example, assuming that the first TRP is the first TRP, that is, i=1, and the second TRP is the reference TRP, then the first phase difference can be obtained according to formula (3):

[0101] In one possible implementation, the first channel state information report includes one or more first phase differences. For example, the first channel state information report can be expressed as CSI-report(α1), including the first phase difference α1. Optionally, if the first device receives downlink reference signals of N TRPs, multiple channel state information reports can be generated, each channel state information report carries a corresponding phase difference; or a channel state information report can be generated, and the channel state information report includes the phase difference between the downlink measurement channel of N-1 TRPs and the downlink measurement channel of the reference TRP. For example, assuming that the terminal sends a channel state information report, the channel state information report can be expressed as CSI-report(α1,α2,…,α i ), i≠nref, where α1, α2,…,α i Indicates the phase difference between the downlink measurement channel of N-1 TRPs and the downlink measurement channel of the reference TRP.

[0102] In one possible implementation, the first channel state information report is a wideband report. For example, the first channel state information report is wideband reporting, with low reporting overhead, and the reporting amount itself is independent of the frequency of the reference signal. For example, the reference signal may correspond to multiple frequency domain units, each frequency domain unit being one or more resource elements (RE), or one or more resource blocks (RB), but multiple frequency domain units correspond to the same channel state information report, or the first channel state information report contains a first phase difference, and the first phase difference corresponds to multiple frequency domain units. In one possible implementation, the terminal device calculates the phase difference based on the average measured channel information measured by multiple frequency domain units; in one possible implementation, the terminal device obtains the first phase difference based on the average of multiple phase differences measured by multiple frequency domain units.

[0103] In one possible implementation, the first channel state information report is subband reporting. For example, the first channel state information report is subband reporting, and the multiple reporting quantities contained in the first channel state information report correspond to different results for different frequency domain units. For example, the reference signal may correspond to multiple frequency domain units, each frequency domain unit being one or more REs, or one or more RBs, wherein each frequency domain unit corresponds to a first phase difference, or the first channel state information report contains multiple first phase differences, and the first phase difference corresponds to a frequency domain unit. In one possible implementation, the terminal device calculates the corresponding first phase difference based on the channel information measured by a frequency domain unit.

[0104] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold. The quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; the quantization range corresponding to the second threshold is greater than or equal to the opposite of the second threshold and less than or equal to the second threshold. Optionally, the first threshold is 2π and the second threshold is π. That is, the first phase difference can be quantized using different thresholds and quantization ranges corresponding to different thresholds. For example, if the first threshold is used, the quantized value of the first phase difference can be between 0 and 2π, or if the second threshold is used, the quantized value of the first phase difference can be between -π and π, which is beneficial for the first device to perform phase adjustment.

[0105] For example, the first threshold is denoted as φ MAX , the number of quantization bits is M, then the quantization step size is The quantization range is [0,φ MAX ), the decimal representation of the M bits contained in the first channel state information report is m, m∈{0,1,…,2 M-1}, if and only if the first phase difference φ n satisfy That is, it falls into the quantitative range For another example, the second threshold is expressed as φ MAX , the number of quantization bits is M, then the quantization step size is The quantization range is [-φ MAX ,φ MAX ), the decimal representation of the M bits contained in the first channel state information report is m, m∈{0,1,…,2 M -1}, if and only if the first phase difference φ n satisfy For example, assuming that the first threshold φ MAX =2π, when M=3, we can find that the quantization range is divided into 2 3 = 8 intervals, and the quantization step size is 2π / 8 = π / 4. Then the 8 quantization intervals are [0, π / 4), [π / 4, π / 2), …, [7π / 4, 2π]. Optionally, each quantization interval can correspond to M bits. For example, the quantization interval [0, π / 4) corresponds to bits 000 (corresponding to decimal 0), the bits corresponding to [π / 4, π / 2) are 001 (corresponding to decimal 1), and so on. The bits corresponding to [7π / 4, 2π) are 111 (corresponding to decimal 8). Different bit values ​​can be used to indicate different quantization intervals, thereby indicating the corresponding phase difference.

[0106] Optionally, the first threshold or the second threshold may also be other values, such as other phase values ​​between 0 and 2π, which can realize the quantization of the first phase difference, and this application does not limit this. Optionally, α1, α2, ..., α i The phase difference between the downlink measurement channel of N-1 TRPs and the downlink measurement channel of the reference TRP can be quantified using the first threshold or the second threshold. The specific quantization implementation method is similar to the quantization method of the first phase value and will not be repeated here.

[0107] S102: The first device determines a second phase difference between a first uplink ranging channel of a first TRP and a second uplink ranging channel of a second TRP.

[0108] In one possible implementation, the first uplink measurement channel is determined by an uplink reference signal received by the first TRP, or in other words, the first uplink measurement channel corresponds to the first TRP. The uplink reference signal corresponds to the terminal. For example, the terminal sends an uplink reference signal, and the first TRP can receive the uplink reference signal. The first TRP can perform channel estimation on the uplink reference signal, and the channel estimation result obtained includes the first uplink measurement channel. Optionally, the first uplink measurement channel may include parameters such as the amplitude and phase of the uplink RF link of the first TRP, and the amplitude and phase of the uplink channel between the first TRP and the terminal.

[0109] In one possible implementation, the second uplink measurement channel is determined by an uplink reference signal received by the second TRP, or in other words, the second uplink measurement channel corresponds to the second TRP. The uplink reference signal corresponds to the terminal. For example, the terminal sends an uplink reference signal, and the second TRP can receive the uplink reference signal. The second TRP can perform channel estimation on the uplink reference signal, and the channel estimation result obtained includes the second uplink measurement channel. Optionally, the second uplink measurement channel may include parameters such as the amplitude and phase of the uplink RF link of the second TRP, and the amplitude and phase of the uplink channel between the second TRP and the terminal.

[0110] Optionally, the uplink reference signal sent by the terminal may be a single-port uplink reference signal sent by the terminal. For example, the terminal sends the uplink reference signal through the same antenna port, and both the first TRP and the second TRP can receive the uplink reference signal, but the uplink measurement channels obtained by the first TRP and the second TRP through channel estimation based on the uplink reference signal may be different (for example, the first uplink measurement channel and the second uplink measurement channel, respectively). Optionally, the uplink reference signal is, for example, a sounding reference signal (SRS).

[0111] In one possible implementation, N TRPs can exchange information about uplink measurement channels, so that N-1 TRPs can determine the second phase difference from the uplink measurement channel of the reference TRP. For example, the terminal sends an uplink reference signal, and the N TRPs receive the uplink reference signal respectively, and perform channel estimation to obtain the downlink measurement channels of the N-1 TRPs and the downlink measurement channel of the reference TRP. Assume that the i-th uplink measurement channel (the i-th uplink measurement channel is any one of the uplink measurement channels of the N-1 TRPs) is as shown in formula (4), and the uplink measurement channel of the reference TRP is as shown in formula (5):

[0112] in, Indicates the uplink measurement channel of the i-th TRP, 0 <i≤N,i≠nref; represents the amplitude of the uplink RF link of the i-th TRP, represents the phase of the uplink RF link of the i-th TRP, |h i | represents the amplitude of the channel between the i-th TRP and the terminal, Represents the phase of the channel between the i-th TRP and the terminal. Indicates the uplink measurement channel of the reference TRP. represents the amplitude of the uplink RF link referenced to TRP, represents the phase of the uplink RF link referenced to TRP, |h nref | represents the amplitude of the channel between the reference TRP and the terminal, h nref Indicates the phase of the channel between the reference TRP and the terminal.

[0113] In one possible implementation, the first device can obtain the phase difference between the uplink measurement channels of N-1 TRPs and the uplink measurement channel of the reference TRP based on the uplink measurement channels of N-1 TRPs and the uplink measurement channel of the reference TRP, as shown in formula (3):

[0114] Among them, β i Represents the phase difference between the uplink measurement channel of the i-th TRP and the uplink measurement channel of the reference TRP.

[0115] Optionally, the first device determines the second phase difference between the first uplink measurement channel of the first TRP and the second uplink measurement channel of the second TRP, and may also adopt the method shown in formula (6). For example, assuming that the first TRP is the first TRP, that is, i=1, and the second TRP is the reference TRP, then the second phase difference can be obtained according to formula (6):

[0116] In one possible implementation, the resources of the first downlink reference signal are associated with the resources of the uplink reference signal; and the resources of the second downlink reference signal are associated with the resources of the uplink reference signal (resource associate). For example, the resource identifier (ResourceSet ID#1) of the first downlink reference signal is associated with the ResourceSet ID of the uplink reference signal. For another example, the ResourceSet ID#2 of the second downlink reference signal is associated with the ResourceSet ID of the uplink reference signal. Optionally, N sets of downlink reference signal resources are pre-configured, and the N sets of downlink reference signal resources are associated with the uplink reference signal resources. For example, N TRPs are pre-configured with N sets of downlink reference signal resources (such as one TRP pre-configured with one set of downlink reference signal resources), and the resources for sending the downlink reference signal by the i-th TRP among the N TRPs are associated with the resources for receiving the uplink reference signal by the i-th TRP.

[0117] In one possible implementation, the resources of N sets of downlink reference signals are associated with the resources of uplink reference signals. Specifically, the transmitting antenna ports of the N sets of downlink reference signals are the same as the receiving antenna ports of the uplink reference signals. For example, the antenna port through which the first TRP sends the first downlink reference signal is the same as the antenna port through which the uplink reference signal is received. The antenna port through which the second TRP sends the second downlink reference signal is the same as the antenna port through which the uplink reference signal is received. Optionally, the resources of the N sets of downlink reference signals may be CSI-RS resources, and the resources of the uplink reference signal may be SRS resources.

[0118] In one possible implementation, the resources of N sets of downlink reference signals are associated with the resources of uplink reference signals. Specifically, the receiving antenna ports of the N sets of downlink reference signals are the same as the transmitting antenna ports of the uplink reference signals. For example, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the uplink reference signal is transmitted; the antenna port through which the terminal receives the second downlink reference signal is the same as the antenna port through which the uplink reference signal is transmitted. Optionally, the antenna port through which the terminal sends the uplink reference signal may be a single port. For example, the terminal sends a single-port SRS to N TRPs, that is, the SRS is sent to N TRPs through the same antenna port.

[0119] Optionally, the receiving antenna port or transmitting antenna port described in the above two embodiments refers to a physical antenna (such as a hardware port) that receives a reference signal or transmits a reference signal. The actual number of physical antennas may be greater than the number of reference signal ports, and there is no fixed mapping relationship between reference signal ports and physical antennas. Reference signal ports refer to the number of ports capable of performing channel estimation and resolution, and are directly related to reference signals. For example, a reference signal port may correspond to a channel measurement result, and the terminal needs to perform channel estimation and data demodulation based on the reference signal corresponding to the port.

[0120] In one possible implementation, the first channel state information report is associated with the resources of the uplink reference signal. For example, the first channel state information report can be represented as CSI-report(α1), including a first phase difference α1. The CSI-report(α1) is associated with the resources of the uplink reference signal, and the antenna port through which the terminal sends the CSI-report(α1) may be the same as the antenna port through which the uplink reference signal is sent; or the antenna port through which the first TRP receives the CSI-report(α1) may be the same as the antenna port through which the uplink reference signal is received.

[0121] S103: The first device determines a phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference.

[0122] The phase calibration coefficient between the first TRP and the second TRP is used to adjust the transmit phase of the first TRP when a downlink reference signal is next transmitted, or to adjust the receive phase of the first TRP when an uplink reference signal is next received. In one possible implementation, the phase calibration coefficient between the first TRP and the second TRP is the difference between the first phase difference and the second phase difference. For example, assuming that the phase calibration coefficient between the first TRP and the second TRP is represented by γ1, then γ1 = α1 - β1.

[0123] In one possible implementation, the i-th TRP may determine a phase calibration coefficient between the i-th TRP and the reference TRP based on a first phase difference of the i-th TRP (e.g., a phase difference between a downlink measurement channel of the i-th TRP and a downlink measurement channel of a reference TRP) and a second phase difference of the i-th TRP (e.g., a phase difference between an uplink measurement channel of the i-th TRP and an uplink measurement channel of the reference TRP). For example, assuming that the phase calibration coefficient between the i-th TRP and the reference TRP is as shown in formula (7):

[0124] Among them, γ i represents the phase calibration coefficient between the i-th TRP and the reference TRP, α irepresents the phase difference between the downlink measurement channel of the i-th TRP and the downlink measurement channel of the reference TRP, β i represents the phase difference between the uplink measurement channel of the i-th TRP and the uplink measurement channel of the reference TRP. Based on the method in formula (7), the i-th TRP can determine the corresponding phase calibration coefficient, thereby adjusting the transmit phase the next time it sends a downlink reference signal or adjusting the receive phase the next time it receives an uplink reference signal, which is beneficial for phase calibration.

[0125] Optionally, the above steps may be performed by a base station, for example, the first device is a base station, the base station receives the channel state information report, and the base station may send the channel state information report corresponding to the TRP to the corresponding TRP, for example, sending the CSI-report (α i ). For another example, the base station obtains the phase difference between the uplink measurement channel of N-1 TRPs and the uplink measurement channel of the reference TRP, and can send the phase difference β between the uplink measurement channel of the TRP and the uplink measurement channel of the reference TRP to the i-th TRP. i Alternatively, the above steps may be performed by a TRP, for example, the first device is the first TRP, and the first TRP receives the first channel state information report; or the first device is the i-th TRP, and the i-th TRP receives the CSI-report (α i ), the i-th TRP determines the phase difference β between the uplink measurement channel of the TRP and the uplink measurement channel of the reference TRP i , thereby determining the phase calibration coefficient γ of the i-th TRP i =α i -β i Alternatively, the above steps may be performed with reference to the TRP. For example, the first device is the reference TRP, and the reference TRP may exchange information with other TRPs to obtain the CSI-report corresponding to the other TRPs, thereby determining the phase calibration coefficient between the other TRPs and the reference TRP.

[0126] In this embodiment, the first device can obtain the first phase difference between the downlink measurement channels of the first TRP and the second TRP by receiving the first channel state information report reported by the terminal; then determine the second phase difference between the uplink measurement channels of the first TRP and the second TRP, and determine the phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference, so that when the TRP sends a downlink reference signal or receives an uplink reference signal next time, the phase of the TRP sent or received is adjusted based on the phase calibration coefficient, which is conducive to achieving reciprocity correction between TRPs without limiting the hardware specifications of the TRP, and is conducive to improving data transmission performance. In addition, the first channel state information report reported by the terminal only needs to carry phase-related information (such as the first phase difference), which is conducive to reducing feedback overhead.

[0127] For example, FIG5 is a flow chart of another communication method provided by the present application. The method is implemented by interaction between the terminal and N TRPs. The difference from the embodiment of FIG4 is that the terminal in the embodiment of FIG5 can determine the reference TRP based on the multiple downlink reference signals received, thereby facilitating the reciprocity calibration between TRPs. Among them, the N TRPs include the i-th TRP and the reference TRP, i≠nref. The method includes the following steps:

[0128] S201, the terminal sends an uplink reference signal; correspondingly, N TRPs receive the uplink reference signal.

[0129] For example, the terminal sends a single-port SRS to N TRPs; correspondingly, the N TRPs receive the single-port SRS. When the N TRPs include a first TRP and a second TRP, the terminal sends an uplink reference signal to the first TRP and the second TRP.

[0130] S202: N TRPs perform channel estimation on uplink reference signals respectively to obtain N uplink measurement channels.

[0131] For example, the i-th TRP receives a single-port SRS and performs channel estimation on the SRS. The channel estimation result is expressed as h i The channel estimation result can be used to precode the downlink reference signal when the i-th TRP sends the downlink reference signal next time. For example, the i-th TRP precodes the CSI-RS, and the precoding can be maximum ratio transmission (MRT) precoding, that is, the precoding can be expressed as Optionally, the precoded downlink reference signal of the i-th TRP can be called a beamformed downlink reference signal, such as Beamformed CSI-RS i.

[0132] Optionally, when the N TRPs include a first TRP and a second TRP, the first TRP performs channel estimation on the uplink reference signal to obtain a first uplink measurement channel; the second TRP performs channel estimation on the uplink reference signal to obtain a second uplink measurement channel.

[0133] S203, the N TRPs send N downlink reference signals; correspondingly, the terminal receives the N downlink reference signals.

[0134] For example, the terminal receives N precoded downlink reference signals (Beamformed CSI-RS). Optionally, when the N TRPs include a first TRP and a second TRP, the terminal receives a first downlink reference signal from the first TRP and a second downlink reference signal from the second TRP.

[0135] S204, the terminal determines the TRP with the largest RSRP among the N downlink reference signals as the reference TRP.

[0136] For example, the terminal receives N Beamformed CSI-RS, selects the TRP corresponding to the CSI-RS with the largest RSRP as the reference TRP, then TRP i = TRP nref. The other N - 1 TRPs are the TRPs other than the reference TRP, then i ≠ nref.

[0137] In a possible implementation, the resources of the N downlink reference signals are associated with the resources of the uplink reference signals. For example, the N TRPs are preconfigured with N sets of resources for downlink reference signals (such as one TRP is preconfigured with one set of resources for downlink reference signals), and the resources of the downlink reference signals sent by the i-th TRP among the N TRPs are associated with the resources of the uplink reference signals received by the i-th TRP. The association between the N sets of resources of the downlink reference signals and the resources of the uplink reference signals can specifically be that the transmit antenna ports of the N sets of downlink reference signals are the same as the receive antenna ports of the uplink reference signals, or that the receive antenna ports of the N sets of downlink reference signals are the same as the transmit antenna ports of the uplink reference signals. The specific implementation method can refer to the corresponding description in S102 and will not be elaborated here.

[0138] S205, the terminal performs channel estimation based on the N downlink reference signals to obtain the downlink measurement channels of the N TRPs, and determines the phase difference between the downlink measurement channels of the N - 1 TRPs and the downlink measurement channel of the reference TRP.

[0139] For example, according to the formulas (1) to (3) described above, the terminal can perform channel estimation based on the N downlink reference signals to obtain the downlink measurement channel of the i-th TRP 0 < i ≤ N, i ≠ nref, and the downlink measurement channel of the reference TRP Furthermore, according to the formula (3) described above, the terminal can determine the phase difference α between the downlink measurement channel of N-1 TRPs and the downlink measurement channel of the reference TRP i For specific implementation methods and examples, please refer to the example description corresponding to the above formula, which will not be repeated here.

[0140] Optionally, when the N TRPs include a first TRP and a second TRP, the terminal performs channel estimation on the first downlink reference signal to obtain a first downlink measurement channel; and performs channel estimation on the second downlink reference signal to obtain a second downlink measurement channel.

[0141] S206: The terminal sends corresponding channel state information reports to N-1 TRPs.

[0142] For example, the terminal has determined that the phase differences between the downlink measurement channels of N-1 TRPs and the downlink measurement channels of the reference TRP include α1, α2, ..., α i , then the terminal can send a channel state information report, which can be expressed as CSI-report(α1,α2,…,α i ), i≠nref.

[0143] Optionally, the first channel state information report includes a first phase difference α1 between the first downlink sounding channel and the second downlink sounding channel.

[0144] In a possible implementation, the first channel state information report is a broadband report. For an example of this implementation, reference may be made to the corresponding description in S101 and will not be repeated here.

[0145] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold. The quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold. Optionally, the first threshold is 2π, and the second threshold is π. For an example of this implementation, please refer to the corresponding description in S101 and will not be repeated here.

[0146] Optionally, the terminal may send a corresponding channel state information report to the reference TRP. The channel state information report corresponding to the reference TRP includes the phase difference between the reference TRP and the downlink measurement channel of N-1 TRPs. For example, the channel state information report corresponding to the reference TRP may be expressed as CSI-report(α nref ).

[0147] Optionally, this embodiment may further include the following process:

[0148] S207, N-1 TRPs determine the phase difference between the uplink measurement channel and the reference TRP.

[0149] For example, according to the formulas (4) to (6) described above, the i-th TRP can determine the uplink measurement channel of the i-th TRP Reference TRP can determine the uplink measurement channel of reference TRP And the uplink measurement channel information can be exchanged between TRPs (for example, the reference TRP can send the uplink measurement channel of the reference TRP to the i-th TRP). ), so that the i-th TRP determines the phase difference β between the uplink measurement channel of the i-th TRP and the uplink measurement channel of the reference TRP i .

[0150] Optionally, the reference TRP can interact with N-1 TRPs to obtain information about the uplink measurement channels corresponding to the N-1 TRPs, thereby determining the phase difference between the reference TRP and the uplink measurement channels of the N-1 TRPs.

[0151] S208, determine the phase calibration coefficient between the N-1 TRPs and the reference TRP.

[0152] For example, according to the formula (7) described above, the i-th TRP can determine the phase calibration coefficient γ between the i-th TRP and the reference TRP i , thereby adjusting the transmission phase when sending a downlink reference signal next time, or adjusting the reception phase when receiving an uplink reference signal next time, which is conducive to phase calibration.

[0153] Optionally, the reference TRP may determine a phase calibration coefficient between the reference TRP and the N-1 TRPs based on the phase difference between the reference TRP and the downlink measurement channels of the N-1 TRPs, as well as the phase difference between the reference TRP and the uplink measurement channels of the N-1 TRPs. It is understood that the specific implementation of S206 to S208 for the reference TRP is similar to that for the i-th TRP, for example, as described in formulas (4) to (7), and is not limited in this application.

[0154] In this embodiment, the terminal can send an uplink reference signal to N TRPs, so that different TRPs can estimate their own uplink measurement channels based on the uplink reference signal. The N TRPs can precode the downlink reference signal based on their own uplink measurement channels, so that the terminal determines the reference TRP based on the precoded downlink reference signal, which is beneficial for the terminal to assist the base station in performing reciprocity correction between TRPs.

[0155] It is understood that in order to implement the functions of the above-mentioned device embodiments, the base station and the terminal include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in conjunction with the various exemplary units and method steps described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application scenario and design constraints of the technical solution.

[0156] Figures 6 and 7 are schematic diagrams of possible communication devices provided in this application. These communication devices can be used to implement the functions of the first device (such as a network-side device, such as a base station, TRP) or the second device (such as a terminal-side device) in the above method embodiment, and thus can also achieve the beneficial effects of the above method embodiment. In the embodiment of the present application, the communication device can be a terminal as shown in Figure 1, or an access network device as shown in Figure 1, or a module (such as a chip) applied to the terminal side or the terminal side.

[0157] As shown in Figure 6, communication device 600 includes a processing unit 610 and a transceiver unit 620. Communication device 600 is used to implement the functions of a terminal or base station in the method embodiments shown in Figures 4 and 5 above. Optionally, transceiver unit 620 includes a transmitting unit and a receiving unit, and transceiver unit 620 can also be referred to as a communication unit.

[0158] When the communication device 600 is used to implement the functions of the network device in the method embodiment shown in Figure 4: the transceiver unit 620 is used to receive a first channel state information report, where the first channel state information report includes a first phase difference between a first downlink measurement channel of a first transmission resource planning (TRP) and a second downlink measurement channel of a second transmission resource planning (TRP); the first downlink measurement channel is determined by a first downlink reference signal, which corresponds to the first transmission resource planning (TRP); the second downlink measurement channel is determined by a second downlink reference signal, which corresponds to the second transmission resource planning (TRP). The processing unit 610 is used to determine a second phase difference between a first uplink measurement channel of the first transmission resource planning (TRP) and a second uplink measurement channel of the second transmission resource planning (TRP); the first uplink measurement channel is determined by an uplink reference signal received by the first transmission resource planning (TRP); the second uplink measurement channel is determined by an uplink reference signal received by the second transmission resource planning (TRP). The processing unit 610 is also used to determine a phase calibration coefficient between the first transmission resource planning (TRP) and the second transmission resource planning (TRP) based on the first phase difference and the second phase difference.

[0159] In one possible implementation, the antenna port for sending the first downlink reference signal by the first TRP is the same as the antenna port for receiving the uplink reference signal.

[0160] In a possible implementation manner, resources of the first downlink reference signal are associated with resources of the uplink reference signal; and resources of the second downlink reference signal are associated with resources of the uplink reference signal.

[0161] In a possible implementation, the first channel state information report is associated with an uplink reference signal resource.

[0162] In one possible implementation, the second TRP is a reference TRP.

[0163] In a possible implementation, the first channel state information report is a broadband report.

[0164] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold, wherein the quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; and the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

[0165] In a possible implementation, the first threshold is 2π, and the second threshold is π.

[0166] It can be seen that when the communication device 600 is used to implement the function of the network device in the method embodiment shown in Figure 4, the communication device 600 can obtain the first phase difference between the downlink measurement channels of the first TRP and the second TRP by receiving the first channel state information report reported by the terminal; then determine the second phase difference between the uplink measurement channels of the first TRP and the second TRP, and determine the phase calibration coefficient between the first TRP and the second TRP based on the first phase difference and the second phase difference, so that when the TRP sends a downlink reference signal or receives an uplink reference signal next time, the phase of the TRP sent or received is adjusted based on the phase calibration coefficient, which is conducive to achieving reciprocity correction between TRPs without limiting the hardware specifications of the TRP, and is conducive to improving data transmission performance. In addition, the first channel state information report reported by the terminal only needs to carry phase-related information, which is conducive to reducing feedback overhead.

[0167] When the communication device 600 is used to implement the functions of the terminal in the method embodiment shown in Figure 4: the transceiver unit 620 is used to receive a first downlink reference signal and a second downlink reference signal. The processing unit 610 is used to estimate a first downlink measurement channel for a first TRP based on the first downlink reference signal, and to estimate a second downlink measurement channel for a second TRP based on the second downlink reference signal. The transceiver unit 620 is also used to send a first channel state information report to the first TRP, where the first channel state information report includes a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0168] In one possible implementation, the second TRP is a reference TRP.

[0169] In a possible implementation, the transceiver unit 620 is further configured to receive N downlink reference signals. The processing unit 610 is further configured to determine a TRP with the largest RSRP among the N downlink reference signals as a reference TRP.

[0170] In one possible implementation, the antenna port through which the terminal receives the first downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal; the antenna port through which the terminal receives the second downlink reference signal is the same as the antenna port through which the terminal sends the uplink reference signal.

[0171] In a possible implementation manner, resources of the first downlink reference signal are associated with resources of the uplink reference signal; and resources of the second downlink reference signal are associated with resources of the uplink reference signal.

[0172] In a possible implementation, the first channel state information report is associated with an uplink reference signal resource.

[0173] In a possible implementation, the first channel state information report is a broadband report.

[0174] In one possible implementation, the first phase difference is quantized using a first threshold or a second threshold, wherein the quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; and the quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

[0175] In a possible implementation, the first threshold is 2π, and the second threshold is π.

[0176] As can be seen, when the communication device 600 is used to implement the functions of the terminal in the method embodiment shown in Figure 4, the communication device 600 can receive downlink reference signals from different TRPs and perform channel estimation based on the downlink reference signals of different TRPs to obtain downlink measurement channels of different TRPs, thereby obtaining a first phase difference between the downlink measurement channels of different TRPs. In addition, the second device can report the first phase difference to the base station, which is beneficial for assisting the base station in performing reciprocity correction between TRPs and improving data transmission performance.

[0177] When the communication device 600 is used to implement the functions of the terminal in the method embodiment shown in Figure 5: the transceiver unit 620 is used to send an uplink reference signal; the uplink reference signal is used for the first TRP to determine the first uplink measurement channel, or the uplink reference signal is used for the second TRP to determine the second uplink measurement channel; the first uplink measurement channel is used to precode the first downlink reference signal; and the second uplink measurement channel is used to precode the second downlink reference signal. The transceiver unit 620 is also used to receive the first downlink reference signal and the second downlink reference signal. The processing unit 610 is used to estimate the first downlink measurement channel of the first TRP based on the first downlink reference signal; and to estimate the second downlink measurement channel of the second TRP based on the second downlink reference signal. The transceiver unit 620 is also used to send a first channel state information report to the first TRP, and the first channel state information report includes a first phase difference between the first downlink measurement channel and the second downlink measurement channel.

[0178] Optionally, other possible implementations may refer to the corresponding description when the communication device 600 is used to implement the functions of the terminal, which will not be repeated here.

[0179] For a more detailed description of the processing unit 610 and the transceiver unit 620 , reference may be made to the relevant descriptions in the method embodiments shown in FIG. 4 and FIG. 5 .

[0180] As shown in Figure 7, the communication device 700 includes a processor 710 and an interface circuit 720. The processor 710 and the interface circuit 720 are coupled to each other. It is understood that the interface circuit 720 can be a transceiver or an input / output interface. Optionally, the communication device 700 may also include a memory 730 for storing instructions executed by the processor 710, or storing input data required by the processor 710 to execute instructions, or storing data generated after the processor 710 executes instructions. Sometimes, the interface circuit 720 can also be understood as a part of the processor 710, in which case the communication device 700 includes the processor 710. Optionally, the transceiver includes a transmitter and a receiver.

[0181] When the communication device 700 is used to implement the method embodiments shown in FIG. 4 and FIG. 5 , the processor 710 is used to implement the functions of the processing unit 610 , and the interface circuit 720 is used to implement the functions of the transceiver unit 620 .

[0182] When the above-mentioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. When the terminal chip receives information from the base station, it can be understood that the information is first received by other modules in the terminal (such as a radio frequency module or antenna) and then sent to the terminal chip by these modules. When the terminal chip sends information to the base station, it can be understood that the information is first sent to other modules in the terminal (such as a radio frequency module or antenna) and then sent to the base station by these modules.

[0183] When the above-mentioned communication device is a chip applied to a base station, the base station chip implements the functions of the base station in the above-mentioned method embodiment. When the base station chip receives information from the terminal, it can be understood that the information is first received by other modules in the base station (such as a radio frequency module or antenna) and then sent to the base station chip by these modules. When the base station chip sends information to the terminal, it can be understood that the information is sent to other modules in the base station (such as a radio frequency module or antenna) and then sent to the terminal by these modules.

[0184] In this application, when entity A sends information to entity B, it can be done directly from A to B or indirectly through another entity. Similarly, when entity B receives information from entity A, it can be done directly from entity B or indirectly through another entity. Entities A and B herein can be RAN nodes or terminals, or modules within a RAN node or terminal. The sending and receiving of information can be information exchange between a RAN node and a terminal, for example, between a base station and a terminal; the sending and receiving of information can also be information exchange between two RAN nodes, for example, between a CU and a DU; the sending and receiving of information can also be information exchange between different modules within a device, for example, between a terminal chip and other modules in the terminal, or between a base station chip and other modules within the base station.

[0185] In other words, sending and receiving can be performed between devices, for example, between a network device and a terminal device, or can be performed within a device, for example, sending or receiving between components, modules, chips, software modules or hardware modules within the device through a bus, wiring or interface.

[0186] It is understandable that information may be processed between the source and destination of information transmission, such as coding, modulation, etc., but the destination can understand the valid information from the source. Similar expressions in this application can be understood similarly and will not be repeated.

[0187] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0188] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and storage medium can also exist in a base station or a terminal as discrete components.

[0189] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0190] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0191] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0192] In this application, words such as "first" and "second" can be used to distinguish technical features with the same or similar functions. The words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit them to be different. In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or design. The use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0193] In the embodiments of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information (such as the indication information described below) is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated; it is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance, for example, the indication of specific information can be achieved with the help of the arrangement order of each information agreed in advance (such as predefined by the protocol), thereby reducing the indication overhead to a certain extent. The present application does not limit the specific method of indication. It is understandable that, for the sender of the indication information, the indication information can be used to indicate the information to be indicated, and for the receiver of the indication information, the indication information can be used to determine the information to be indicated.

[0194] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: The method comprises: receiving a first channel state information report, the first channel state information report including one or more first phase differences between a first downlink sounding channel of a first transmission reception point (TRP) and a second downlink sounding channel of a second TRP; the first downlink sounding channel being determined by a first downlink reference signal, the first downlink reference signal corresponding to the first TRP; and the second downlink sounding channel being determined by a second downlink reference signal, the second downlink reference signal corresponding to the second TRP; determining one or more second phase differences between a first uplink ranging channel of the first TRP and a second uplink ranging channel of the second TRP, wherein the first uplink ranging channel is determined by an uplink reference signal received by the first TRP, and the second uplink ranging channel is determined by an uplink reference signal received by the second TRP; Based on the first phase difference and the second phase difference, a phase calibration coefficient between the first TRP and the second TRP is determined.

2. The method according to claim 1, characterized in that The antenna port through which the first TRP sends the first downlink reference signal is the same as the antenna port through which the uplink reference signal is received; The antenna port for sending the second downlink reference signal by the second TRP is the same as the antenna port for receiving the uplink reference signal.

3. The method according to claim 1, characterized in that The resource of the first downlink reference signal is associated with the resource of the uplink reference signal; The resource of the second downlink reference signal is associated with the resource of the uplink reference signal.

4. The method according to claim 1, wherein The first channel state information report is associated with a resource of the uplink reference signal.

5. The method according to any one of claims 1 to 4, characterized in that The second TRP is a reference TRP.

6. The method according to any one of claims 1 to 4, characterized in that The first channel state information report is a broadband report, and the first channel state information report corresponds to a first phase difference.

7. The method according to any one of claims 1 to 4, characterized in that The first channel state information report is a sub-band report, and the first channel state information report corresponds to multiple first phase differences.

8. The method according to any one of claims 1 to 4, characterized in that The first phase difference is quantified using a first threshold or a second threshold; The quantization range corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; The quantization range corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

9. The method according to claim 8, characterized in that The first threshold is 2π, and the second threshold is π.

10. A communication method, characterized in that: The method comprises: receiving a first downlink reference signal and a second downlink reference signal; Estimating based on the first downlink reference signal to obtain a first downlink measurement channel of the first TRP; Estimating a second downlink ranging channel of the second TRP based on the second downlink reference signal; A first channel state information report is sent to the first TRP, where the first channel state information report includes one or more first phase differences between the first downlink measurement channel and the second downlink measurement channel.

11. A communication method, characterized in that: The method comprises: Sending an uplink reference signal; the uplink reference signal is used for a first TRP to determine a first uplink sounding channel, or the uplink reference signal is used for a second TRP to determine a second uplink sounding channel; the first uplink sounding channel is used to precode a first downlink reference signal; the second uplink sounding channel is used to precode a second downlink reference signal; receiving the first downlink reference signal and the second downlink reference signal; Estimating based on the first downlink reference signal to obtain a first downlink measurement channel of the first TRP; Estimating a second downlink ranging channel of the second TRP based on the second downlink reference signal; A first channel state information report is sent to the first TRP, where the first channel state information report includes one or more first phase differences between the first downlink measurement channel and the second downlink measurement channel.

12. The method according to claim 10 or 11, characterized in that The second TRP is a reference TRP.

13. The method according to claim 10 or 11, characterized in that The method further comprises: N downlink reference signals are received, and a TRP having the largest reference signal received power (RSRP) among the N downlink reference signals is determined as the reference TRP.

14. The method according to claim 10 or 11, characterized in that The antenna port for receiving the first downlink reference signal is the same as the antenna port for sending the uplink reference signal; The antenna port for receiving the second downlink reference signal is the same as the antenna port for sending the uplink reference signal.

15. The method according to claim 10 or 11, characterized in that The resource of the first downlink reference signal is associated with the resource of the uplink reference signal; The resource of the second downlink reference signal is associated with the resource of the uplink reference signal.

16. The method according to claim 10 or 11, characterized in that The first channel state information report is associated with a resource of the uplink reference signal.

17. The method according to claim 10 or 11, characterized in that The first channel state information report is a broadband report, and the first channel state information report corresponds to a first phase difference.

18. The method according to claim 10 or 11, characterized in that The first channel state information report is a sub-band report, and the first channel state information report corresponds to multiple first phase differences.

19. The method according to claim 10 or 11, characterized in that The phase difference of the first phase calibration coefficient is quantified using a first threshold or a second threshold; The quantization range of the phase calibration coefficient corresponding to the first threshold is greater than or equal to 0 and less than or equal to the first threshold; The quantization range of the phase calibration coefficient corresponding to the second threshold is greater than or equal to the inverse of the second threshold and less than or equal to the second threshold.

20. The method according to claim 19, characterized in that The first threshold is 2π, and the second threshold is π.

21. A communication device, characterized in that: The method comprises a module or unit for executing the method according to any one of claims 1 to 9, or comprises a module or unit for executing the method according to any one of claims 10 to 20.

22. A communication device, characterized in that: The communication device comprises a memory and one or more processors, wherein the memory is used to store a computer program; the one or more processors are used to execute the computer program in the memory, so that the communication device performs the method according to any one of claims 1 to 9 or claims 10 to 20.

23. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 9 or claims 10 to 20 is implemented.

24. A computer program product, characterized in that The method comprises instructions which, when executed on a computer, cause the computer to perform the method according to any one of claims 1 to 9 or claims 10 to 20.

25. A communication system, characterized in that: The communication system includes an apparatus for executing the method according to any one of claims 1 to 9, and an apparatus for executing the method according to any one of claims 10 to 20.

26. A chip or a chip system, characterized in that: comprising a processor for performing the method of any one of claims 1 to 9 or claims 10 to 20.

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