Communication method and communication device

Abstract

The invention provides a communication method and a communication device. The method comprises the following steps: receiving a first downlink reference signal and a second downlink reference signal, wherein the first downlink reference signal and the second downlink reference signal are both carried on resources at a plurality of moments; first information is transmitted, the first information indicating a first phase. Wherein the first phase is obtained according to at least one of the first downlink reference signal and the second downlink reference signal.

Description

Technical Field

[0001] This application relates to the field of communications, and in particular, to a communication method and a communication device. Background Art

[0002] Coherent joint transmission (CJT) means that, according to a joint channel composed of channels between multiple network devices and a terminal device, a joint transmission weight is calculated and the same data stream is transmitted to the terminal device, so that signals from multiple network devices are coherently superimposed at the terminal device, and interference is coherently cancelled, thereby improving the received signal-to-interference-and-noise ratio (SINR) of the terminal device, and further improving the data transmission rate between the network device and the terminal device.

[0003] However, the prerequisite for realizing coherent joint is to ensure that the carrier frequencies between network devices are the same and the transmission signal phases are synchronized. There are many scenarios where different network devices do not share a common clock source. Since all signal processing, sampling, and carrier generation are carried out under clock control, there are frequency and phase differences between stations, resulting in the inability to achieve coherence in the phases of signals transmitted between stations and the inability to ensure the CJT transmission effect. Summary of the Invention

[0004] Embodiments of this application provide a communication method and a communication device, which can improve communication performance.

[0005] In a first aspect, a communication method is provided. This method may be executed by a terminal device or a module (such as a chip or a chip system) configured in (or for) the terminal device. Hereinafter, the case where the terminal device executes this method is taken as an example for description.

[0006] The method includes: The terminal device receives a first downlink reference signal and a second downlink reference signal, and both the first downlink reference signal and the second downlink reference signal are carried on resources at multiple moments. The terminal device sends a first piece of information, and the first piece of information indicates a first phase. Wherein, the first phase is obtained according to at least one of the first downlink reference signal or the second downlink reference signal.

[0007] Exemplarily, the first downlink reference signal comes from a first transmission and reception point (TRP), and the second downlink reference signal comes from a second TRP.

[0008] According to the above solution, the terminal device receives multiple downlink reference signals and sends first information indicating the phase obtained by measuring the multiple downlink reference signals. After the network side obtains the first information, it can determine the phase compensation amount of the signal between the first TRP that sends the first reference signal and the second TRP that sends the second reference signal. The first TRP and the second TRP are the TRPs that transmit data for the terminal device using the CJT method. After the first TRP and the second TRP perform phase compensation on the signal based on the phase compensation amount, the transmission performance of CJT can be improved, thereby improving the data transmission rate between the network device and the terminal device. The communication performance of the network is improved.

[0009] In one implementation, the first phase is obtained based on at least one of the first downlink reference signal or the second downlink reference signal, including: the first phase is obtained based on the difference between the first phase change amount and the second phase change amount. Wherein, the first phase change amount is obtained based on the first downlink reference signal, and the second phase change amount is obtained based on the second downlink reference signal.

[0010] In another implementation, the first phase is obtained based on at least one of the first downlink reference signal or the second downlink reference signal, including: the first phase is the first phase change amount or the second phase change amount.

[0011] Exemplarily, the first phase change amount is the phase change amount obtained by measuring the first downlink reference signal at different times, and the second phase change amount is the phase change amount obtained by measuring the second downlink reference signal at different times.

[0012] According to the two implementations, the terminal device can specifically report the first information to the network side, and the first information indicates the phase change amount or the difference of the phase change amount obtained by measuring the downlink reference signal, so that the network side can determine the phase compensation amount according to the first information, thereby improving the transmission performance of CJT.

[0013] Combined with the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device receives a third downlink reference signal, and the third downlink reference signal is carried on the resources at the multiple times. Wherein, the first information further indicates a second phase, and the second phase is obtained based on the third downlink reference signal.

[0014] In one example, the first information includes a first phase change amount, a second phase change amount, and a third phase change amount. The first phase is the first phase change amount or the second phase change amount, the second phase is the third phase change amount, and the third phase change amount is obtained based on the third downlink reference signal. Among them, the first phase change amount is obtained based on the first downlink reference signal, the second phase change amount is obtained based on the second downlink reference signal, and the third phase change amount is obtained based on the third downlink reference signal.

[0015] In another example, the first phase is obtained based on the difference between the first phase change amount and the second phase change amount, and the second phase is obtained based on the difference between the first phase change amount and the third phase change amount.

[0016] According to the above solution, more than two TRPs can provide CJT services for the terminal device. For example, in addition to the first TRP and the second TRP, the third TRP also provides CJT services for the terminal device together with the first TRP and the second TRP. Then, the terminal device can also receive the third downlink reference signal transmitted by the third TRP and report the second phase obtained based on the third downlink reference signal to the network side. This enables the network side to determine the phase compensation amount between the three TRPs. After performing phase compensation on the signal, the transmission performance of CJT is improved.

[0017] Combined with the first aspect, in some implementation manners of the first aspect, the first information includes the quantization bits of the first phase, and the quantization bits are obtained based on the first phase and the quantization interval. Among them, the quantization interval is indicated by the third information from the network device; or, the quantization interval is determined by the terminal device, and the first information further includes the fourth information, and the fourth information is used to indicate the quantization interval.

[0018] Combined with the first aspect, in some implementation manners of the first aspect, the first information further indicates the phase level corresponding to the first phase and the first duration, and the phase level and the first duration are used to determine the first phase.

[0019] According to the above solution, the network side and the terminal device can reach a consensus on the specific indication manner of the first information, so that the terminal device can indicate the first phase using the corresponding indication manner, and the network side (such as the first TRP and / or the second TRP) can interpret the first information in the corresponding manner to obtain the first phase. This can reduce the situation of information transmission errors caused by failure to reach a consensus on the indication manner.

[0020] Combined with the first aspect, in some implementation manners of the first aspect, the first information includes the second quantity, and the second quantity is the number of unit times included in the first duration; or, the first information includes the second identifier, and the second identifier corresponds to the first duration.

[0021] In combination with the first aspect, in some implementations of the first aspect, before receiving the first downlink reference signal and the second downlink reference signal, the method further includes: the terminal device sends an uplink reference signal, and the first downlink reference signal and the second downlink reference signal are related to the uplink reference signal.

[0022] Exemplarily, the uplink reference signal is used to determine a pre-compensation coefficient, and the first downlink reference signal and the second downlink reference signal are reference signals compensated according to the pre-compensation coefficient.

[0023] According to the above solution, the network side determines a pre-compensation coefficient for the downlink reference signal based on the compensation amount obtained by measuring the uplink reference signal of the terminal device. After sending the pre-compensation coefficient to the terminal device to compensate the downlink reference signal, it enables the terminal device to improve the accuracy of the first phase (such as the phase change amount or the difference of the phase change amount) obtained by the terminal device measuring the downlink reference signal.

[0024] In combination with the first aspect, in some implementations of the first aspect, the time interval between any one of the first downlink reference signal and the second downlink reference signal and the uplink reference signal is less than or equal to a preset time interval.

[0025] According to the above solution, the minimum transmission interval between the downlink reference signal and its associated uplink reference signal can be specified, reducing the situation where the pre-compensation coefficient is inaccurate due to too long an interval time.

[0026] In combination with the first aspect, in some implementations of the first aspect, after the terminal device sends the first information, the method further includes: the terminal device receives data jointly coherently transmitted from the first TRP and the second TRP, and the jointly coherently transmitted data is processed according to the first phase.

[0027] In a second aspect, a communication method is provided. This method can be executed by a network device or a module (such as a chip or a chip system) configured in (or for) the network device. The following takes the network device executing this method as an example for illustration.

[0028] The method includes: the network device sends a first downlink reference signal, the first downlink reference signal is carried on resources at multiple moments, and the first downlink reference signal is used to obtain a first phase. The network device receives first information, and the first information indicates the first phase.

[0029] In combination with the second aspect, in some implementations of the second aspect, the method further includes: The network device sends second information, where the second information is used to configure the terminal device to receive the first downlink reference signal and the second downlink reference signal, the second downlink reference signal is carried on the resources at the multiple moments, and the first downlink reference signal and the second downlink reference signal are used to obtain the first phase.

[0030] In combination with the second aspect, in some implementations of the second aspect, the first phase is the difference between a first phase change amount and a second phase change amount, or the first phase is the first phase change amount or the second phase change amount. Wherein, the first phase change amount is obtained according to the first downlink reference signal, and the second phase change amount is obtained according to the second downlink reference signal.

[0031] In combination with the second aspect, in some implementations of the second aspect, the second phase is the difference between the first phase change amount and a third phase change amount; or the second phase is the third phase change amount. Wherein, the third phase change amount is obtained according to a third downlink reference signal, and the third downlink reference signal is a downlink reference signal configured for the terminal device and carried on the resources at the multiple moments.

[0032] In combination with the second aspect, in some implementations of the second aspect, the first information includes quantization bits of the first phase, and the quantization bits are obtained according to the first phase and a quantization interval. Wherein, the quantization interval is indicated by third information from the network device; or the quantization interval is determined by the terminal device, and the first information further includes fourth information, where the fourth information is used to indicate the quantization interval.

[0033] In combination with the second aspect, in some implementations of the second aspect, the first information further indicates a phase range corresponding to the first phase and a first duration, and the phase range and the first duration are used to determine the first phase.

[0034] In combination with the second aspect, in some implementations of the second aspect, the first information includes a second quantity, where the second quantity is the number of unit times included in the first duration; or the first information includes a second identifier, and the second identifier corresponds to the first duration.

[0035] In combination with the second aspect, in some implementations of the second aspect, before the network device sends the first downlink reference signal, the method further includes: The network device receives an uplink reference signal, and the first downlink reference signal is correlated with the uplink reference signal.

[0036] In combination with the second aspect, in some implementations of the second aspect, the method further includes: The network device determines a pre-compensation coefficient according to the uplink reference signal, and the first downlink reference signal is a reference signal pre-compensated according to the pre-compensation coefficient.

[0037] In combination with the second aspect, in some implementations of the second aspect, the time interval between the first downlink reference signal and the uplink reference signal is less than or equal to a preset time interval.

[0038] In combination with the second aspect, in some implementations of the second aspect, the method is performed by a first TRP. After sending the first information, the method further includes: the network device sending data for joint coherent transmission with a second TRP, and the data for joint coherent transmission is obtained according to the first phase processing.

[0039] In a third aspect, a communication method is provided, and the method can be performed by a terminal device or a module (such as a chip or a chip system) configured in (or for) the terminal device. The following takes the terminal device performing the method as an example for illustration.

[0040] The method includes: the terminal device receiving a first downlink reference signal and a second downlink reference signal, where both the first downlink reference signal and the second downlink reference signal are carried on resources at multiple moments. The terminal device sends first information, and the first information indicates a first frequency. Wherein, the first frequency is obtained according to at least one of the first downlink reference signal or the second downlink reference signal.

[0041] In a fourth aspect, a communication method is provided, and the method can be performed by a network device or a module (such as a chip or a chip system) configured in (or for) the network device. The following takes the network device performing the method as an example for illustration.

[0042] The method includes: the network device sending a first downlink reference signal, where the first downlink reference signal is carried on resources at multiple moments, and the first downlink reference signal is used to obtain a first frequency. The network device receives first information, and the first information indicates a first frequency.

[0043] In a fifth aspect, a communication method is provided, and the method can be performed by a terminal device or a module (such as a chip or a chip system) configured in (or for) the terminal device. The following takes the terminal device performing the method as an example for illustration.

[0044] The method includes: the terminal device receiving a first downlink reference signal, where the first downlink reference signal is carried on resources at multiple moments. The terminal device sends first information, and the first information indicates a first phase (or a first frequency). Wherein, the first phase (or the first frequency) is obtained according to the first downlink reference signal.

[0045] Sixth aspect, a communication device is provided. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in any implementation manner of the first aspect, the third aspect, or the first aspect and the third aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. In one design, the device includes: a transceiver unit, configured to receive a first downlink reference signal and a second downlink reference signal, where both the first downlink reference signal and the second downlink reference signal are carried on resources at multiple moments. The terminal device sends first information, where the first information indicates a first phase (or a first frequency). Wherein, the first frequency (or the first frequency) is obtained according to at least one of the first downlink reference signal or the second downlink reference signal.

[0046] Seventh aspect, a communication device is provided. In one design, the device may include modules corresponding one by one to the methods / operations / steps / actions described in any implementation manner of the first aspect or the first aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. In one design, the device includes: a transceiver unit, configured to send a first downlink reference signal, where the first downlink reference signal is carried on resources at multiple moments, and the first downlink reference signal is used to obtain a first frequency. The transceiver unit is further configured to receive first information, where the first information indicates a first phase (or a first frequency). A processing unit, configured to determine the first phase (or the first frequency) according to the first information.

[0047] Eighth aspect, a communication device is provided, including a processor. The processor may implement the methods in any possible implementation manner of the above first aspect to the fifth aspect and the first aspect to the fifth aspect. Optionally, the communication device further includes a memory, and the processor is coupled to the memory and may be configured to execute instructions in the memory to implement the methods in any possible implementation manner of the above first aspect to the fifth aspect and the first aspect to the fifth aspect. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface. In the embodiments of the present application, the communication interface may be a transceiver, a pin, a circuit, a bus, a module, or other types of communication interfaces, without limitation.

[0048] In one implementation manner, the communication device is a communication device (such as a terminal device or an access network device). When the communication device is a communication device, the communication interface may be a transceiver, or an input / output interface.

[0049] In another implementation manner, the communication device is a chip configured in a communication device. When the communication device is a chip configured in a communication device, the communication interface may be an input / output interface.

[0050] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0051] In a ninth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit the signal through the output circuit, so that the processor executes the methods in the first aspect to the fifth aspect and any possible implementation manner in the first aspect to the fifth aspect.

[0052] In a specific implementation process, the foregoing processor may be one or more chips. The input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be transistors, gate circuits, flip-flops, and various logic circuits, etc. The input signal received by the input circuit may be received and input by, for example but not limited to, a receiver. The signal output by the output circuit may be output to, for example but not limited to, a transmitter and transmitted by the transmitter. Moreover, the input circuit and the output circuit may be the same circuit, which is used as the input circuit and the output circuit at different times respectively. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

[0053] In a tenth aspect, a computer program product is provided, including: a computer program (which may also be referred to as code or instruction). When the computer program is run, it causes the computer to execute the methods in the first aspect to the fifth aspect and any possible implementation manner in the first aspect to the fifth aspect.

[0054] In an eleventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program (which may also be referred to as code or instruction). When it runs on a computer, it causes the computer to execute the methods in the first aspect to the fifth aspect and any possible implementation manner in the first aspect to the fifth aspect.

[0055] In a twelfth aspect, a communication system is provided, including at least one of the foregoing terminal devices and at least one of the foregoing TRPs. Description of the Drawings

[0056] Figure 1 is a schematic diagram of a communication system applicable to the embodiments of the present application;

[0057] Figure 2 is another schematic diagram of a communication system applicable to the embodiments of the present application;

[0058] Figure 3 is a schematic flowchart of the communication method provided by the present application;

[0059] Figure 4It is a schematic diagram of downlink reference signal resource mapping provided by this application;

[0060] Figure 5 It is another schematic flowchart of the communication method provided by the embodiments of this application;

[0061] Figure 6 It is a schematic diagram of an application scenario of the embodiments of this application;

[0062] Figure 7 It is a schematic block diagram of the communication device provided by the embodiments of this application;

[0063] Figure 8 It is another schematic structural diagram of the communication device provided by the embodiments of this application. Detailed implementation manners

[0064] Next, the technical solutions in this application will be described with reference to the accompanying drawings.

[0065] In the embodiments of this application, " / " may indicate that the objects associated before and after are an "or" relationship. For example, A / B may indicate A or B; "and / or" can be used to describe three relationships of associated objects. For example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B can be singular or plural. For the convenience of describing the technical solutions of the embodiments of this application, in the embodiments of this application, words such as "first" and "second" can be used for distinction. These words such as "first" and "second" do not limit the quantity and execution order, and these words such as "first" and "second" do not necessarily limit to be different. In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. Using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way for easy understanding. In the embodiments of this application, at least one (kind) can also be described as one (kind) or more than one (kind). More than one (kind) can be two (kinds), three (kinds), four (kinds) or more, and this application does not make limitations.

[0066] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, 5th generation (5G) communication systems, Wireless Fidelity (WiFi) systems, and the communication method provided by the present application can also be applied to communication systems evolved after 5G, such as 6th generation (6G) communication systems, future communication systems or other communication systems, etc. The present application does not limit this.

[0067] Figure 1 To illustrate a possible and non-limiting system schematic diagram. As Figure 1 shown, the communication system 10 includes a Radio Access Network (RAN) 100 and a Core Network (CN) 200. The RAN 100 includes at least one RAN node (such as Figure 1 110a and 110b in Figure 1 collectively referred to as 110) and at least one terminal (such as Figure 1 120a - 120j in

[0068] collectively referred to as 120). The RAN 100 may also include other RAN nodes, for example, wireless relay devices and / or wireless backhaul devices ( Figure 1 not shown in

[0068] ). The terminal 120 is connected to the RAN node 110 in a wireless manner. The access network node (or referred to as RAN node) 110 is connected to the core network 200 in a wireless or wired manner. The core network devices in the core network 200 and the access network nodes 110 in the RAN 100 may be different physical devices respectively, or may be the same physical device integrating the core network logic function and the radio access network logic function.

[0068] The RAN 100 may be a cellular system related to the 3rd Generation Partnership Project (3GPP), such as 4G, 5G mobile communication systems, or an evolved system for the future (such as 6G mobile communication systems). The RAN 100 may also be an Open Radio Access Network (O-RAN or ORAN), a Cloud Radio Access Network (CRAN), or a Wireless Fidelity (WiFi) system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0069] The access network node 110, sometimes also referred to as an access network device, a RAN entity, or an access node, etc., forms part of a communication system and is used to assist a terminal in achieving wireless access. Multiple access network nodes 110 in the communication system 10 can be of the same type or different types. In some scenarios, the roles of the access network node 110 and the terminal 120 are relative. For example, Figure 1 the network element 120i can be a helicopter or a drone, which can be configured as a mobile base station. For the terminals 120j accessing the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal. The access network node 110 and the terminal 120 are sometimes both referred to as communication devices. For example, Figure 1 the network elements 110a and 110b in the figure can be understood as communication devices with base station functions, and the network elements 120a - 120j can be understood as communication devices with terminal functions.

[0070] In a possible scenario, the access network node can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc. The access network node can be a macro base station (such as Figure 1 110a in the figure), a micro base station or an indoor station (such as Figure 1 110b in the figure), a relay node or a donor node, or a radio controller in a CRAN scenario. Optionally, the access network node can also be a server, a wearable device, a vehicle or an in-vehicle device, etc. For example, the access network device in vehicle to everything (V2X) technology can be a road side unit (RSU). All or part of the functions of the access network node in this application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform). The access network node in this application can also be a logical node, a logical module or software that can implement all or part of the access network node functions.

[0071] In another possible scenario, multiple access network nodes cooperate to assist a terminal in achieving wireless access, and different access network nodes respectively implement partial functions of a base station. For example, the access network node can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be set separately, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as included in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0072] The terminal can also be referred to as a terminal device, a user equipment (UE), a mobile station, a mobile terminal, etc. The terminal can be widely used in various scenarios for communication. Such scenarios include, for example, but are not limited to at least one of the following scenarios: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communications (mMTC), D2D, V2X, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart grid, smart furniture, smart office, smart wearables, smart transportation, sensing terminals, terminals for communication and sensing integration, or smart cities, etc. The terminal can be a mobile phone (such as Figure 1 120a, 120j, and 120e in Figure 1 ), a tablet computer, a computer with wireless transceiver function (such as Figure 1 120g in Figure 1 ), a customer-premises equipment (CPE), a smart point of sale (POS) machine, a wearable device, a vehicle (such asFigure 1 such as 120h) in

[0073] Figure 2 is another system schematic diagram applicable to the embodiments of the present application. The system may include multiple transmission points, such as Figure 2 the transmission points 211, 212, and 213 shown in the figure. The transmission point may be a transmission and reception point (TRP) with information sending and receiving functions. The system may further include at least one terminal device, such as Figure 2 the terminal device 220 shown in the figure. As Figure 2 shown in the figure, multiple TRPs may communicate with the terminal device 220 in a manner of cooperation among multiple transmission points. For example, the multiple TRPs may communicate with the terminal device in a manner of coherent joint transmission (CJT). The multiple TRPs transmit the same data stream to the terminal device through joint transmission, so as to achieve coherent superposition of signals at the terminal device and interference coherent cancellation, greatly improving the signal-to-interference-and-noise ratio (SINR) of the terminal device, and further improving the data transmission rate between the network device and the terminal device.

[0074] In the embodiments of the present application, the TRP may be an access network node. For example, the TRP may be a network device (such as an access network device), or the TRP may be configured in a network device. For example, the TRP may be a baseband unit (BBU), a remote radio unit (RRU), or a distributed unit (DU) of a network device, etc. Alternatively, the TRP may also be an antenna panel or an antenna port group of a network device. The present application does not limit the specific form of the TRP. It should be understood that the TRP and the network device may be mutually replaced in the present application.

[0075] In the embodiments of the present application, the operations performed by the network side may be performed by a single TRP on the network side, and this TRP may be a TRP participating in the CJT of the terminal device. Alternatively, different operations performed by the network side may also be performed by different devices on the network side. For example, different operations may be performed by a CU and a DU respectively, etc. The present application does not limit this.

[0076] Regarding the problem of non-ideal clock synchronization between TRPs, it is currently solved by the method of reciprocal calibration between TRPs. Specifically, calibration pilots are mutually sent between TRPs to estimate the calibration coefficients between TRPs. The above calibration coefficients are used to compensate the amplitude, phase, and time delay of the receive channel or transmit channel between TRPs, ensuring that the ratio of the response of each transmit channel and receive channel between TRPs is a constant, thereby compensating for the impact of non-ideal clock synchronization.

[0077] The following is a simple analysis of this method. Consider the scenario where TRP1 and TRP2 do not share a common clock source. Reciprocal calibration is performed between the two TRPs by mutually sending pilots. Denote the calibration pilot symbols mutually sent by TRP1 and TRP2 as s. Then, for the calibration pilot sent from TRP1 to TRP2, the received signal at TRP2 is

[0078]

[0079] Similarly, for the calibration pilot sent from TRP2 to TRP1, the received signal at TRP1 is

[0080]

[0081] where k is the sub-band identifier, t is the time identifier, and,

[0082] Δτ syn1 and Δτ syn2 respectively represent the timing deviations of TRP1 and TRP2 from a certain standard time.

[0083] Δf 1 and Δf 2 respectively represent the deviations of the carrier frequencies generated by TRP1 and TRP2 from a certain standard frequency.

[0084] η 1,r and η 2,r respectively represent the receive channel responses of TRP1 and TRP2, including the amplitude, phase, and time delay of the receive channel; correspondingly, η 1,t and η 2,t respectively represent the transmit channel responses of TRP1 and TRP2, including the amplitude, phase, and time delay of the transmit channel. The above parameters are caused by the hardware characteristics of the transceiver channels and thus change slowly over time.

[0085] h 1→2 and h 2→1 respectively represent the air interface channel responses from TRP1 to TRP2 and from TRP2 to TRP1. Due to the reciprocity of the channel, h 1→2 and h 2→1 are equal.

[0086] At this time, the calibration coefficient can be obtained by dividing the calibration pilot received signals of TRP2 and TRP1, and is given by the following formula

[0087]

[0088] After the above calibration coefficient compensation, the ratio of the transceiver channel responses of TRP1 and TRP2 is equal, that is, the following characteristics are satisfied

[0089]

[0090] Analyzing Equation (1), it can be seen that if we want to ensure that the characteristics given by Equation (2) are satisfied at every moment, the calibration coefficient C needs to change with time, mainly due to the in Equation (1) above. That is, the frequency deviation will cause a phase difference between TRPs that accumulates over time. However, by the method of mutual pilot transmission between TRPs, only the calibration coefficient C corresponding to a certain calibration moment can be obtained, and the calibration coefficient obtained at the previous calibration moment is used for channel compensation between two calibration moments, and the phase difference accumulated over time due to frequency deviation cannot be compensated in real time, especially when the interval between two calibrations is relatively long and the phase difference accumulated over time exceeds 180°. In response to the above problem, this application proposes that the terminal device measures and reports relevant parameters to assist the network side in obtaining the frequency deviation Δf 2 -Δf 1 estimation to compensate for the accumulated phase difference caused by frequency deviation.

[0091] If TRP1 and TRP2 do not share a clock source, the reference carrier frequencies of TRP1 and TRP2 are f c , and the carriers generated by TRP1 and TRP2 have frequency deviations of Δ 1 and Δ 2 respectively. At this time, the carrier frequencies of TRP1 and TRP2 are f c TRP1 = f c ×(1 + Δ 1 ) and f c TRP2 = f c ×(1 + Δ 2 ), respectively. Correspondingly, Δf 1 = Δ 1 × f c and Δf 2 = Δ 2 × f c . When TRP1 and TRP2 complete the above mutual pilot transmission calibration, it can be ensured that the signals of the transmission channels of TRP1 and TRP2 have the same phase. After time t, the accumulated phase difference between the transmission signals of TRP1 and TRP2 is 2π × f c ×(Δ 1 - Δ2 )×t, i.e., 2π×(Δf 1 -Δf 2 )×t. Exemplarily, if f c = 3.5 GHz, considering the clock accuracy index Δ 1 -Δ 2 is of the order of 1×10 -10 In this case, within 20 ms, the cumulative phase difference between TRPs caused by frequency offset is 50°. At this time, even if the air interface channel does not change, the transmitted signals of TRP1 and TRP2 cannot be coherently superimposed at the terminal device due to the phase difference, and the interference cannot be completely eliminated, resulting in a decline in CJT transmission performance.

[0092] If it is necessary to compensate the phase difference of the transmitted signals between the above-mentioned TRPs in a timely manner, frequent mutual transmission of pilot signals for calibration is required between the TRPs. However, due to limited air interface resources and to avoid interference from calibration pilot signals, etc., for any pair of TRPs, the interval of mutual transmission of pilot signals in the air interface is generally on the order of seconds, and a typical value is 3.3 s. However, the cumulative phase difference caused by frequency offset will have a large flip in about dozens of milliseconds. Therefore, relying only on calibration between TRPs to correct the impact of non-ideal clocks cannot guarantee CJT transmission performance.

[0093] To address the above problems, the present application proposes that the terminal device can measure and report relevant parameters to assist the network side in compensating the phase difference between TRPs that accumulates over time due to the frequency offset between TRPs, thereby improving CJT transmission performance.

[0094] Figure 3 It is a schematic flowchart of a communication method 300 provided by an embodiment of the present application. The method may include but is not limited to the following S301 and S302.

[0095] S301, the terminal device receives a first downlink reference signal and a second downlink reference signal, and both the first downlink reference signal and the second downlink reference signal are carried on resources at multiple moments.

[0096] Exemplarily, the multiple moments carrying each of the first downlink reference signal and the second downlink reference signal may refer to different orthogonal frequency division multiplexing (OFDM) symbols in one or more time slots. For example, the multiple moments may be different OFDM symbols in one time slot. Or the multiple moments may be multiple OFDM symbols in multiple time slots. For example, the multiple moments may be OFDM symbols in different time slots, that is, one moment is an OFDM symbol in one time slot, and different moments are OFDM symbols in different time slots. For another example, at least two of the multiple moments may be different OFDM symbols in the same time slot, and at least two of the multiple moments may be OFDM symbols in different time slots. This application does not make any limitation in this regard.

[0097] Exemplarily, the first downlink reference signal and / or the second downlink reference signal may be a channel state information-reference signal (CSI-RS) or a tracking reference signal (TRS).

[0098] For example, the first downlink reference signal and the second downlink reference signal may be TRSs, and the TRSs may be carried on multiple OFDM symbols. For example, the TRSs may be carried on two OFDM symbols in the same time slot.

[0099] For another example, each of the first downlink reference signal and the second downlink reference signal may include CSI-RSs carried on multiple CSI-RS resources. The multiple CSI-RS resources may be located on adjacent or close multiple time slots, and the mapping positions of the multiple CSI-RS resources in the frequency domain are the same.

[0100] As Figure 4 shown, on the resources carrying the first downlink reference signal and the second downlink reference signal at multiple moments, the multiple moments include moment t 1 and moment t 2 , and the multiple moments may further include Figure 4Other moments not shown. Exemplarily, the resources at the multiple moments may be resources on different OFDM symbols of one or more time slots. The first downlink reference signal and the second downlink reference signal may also be distributed on multiple subbands, such as subband k, subband k-1, and subband k-2, and the multiple subbands may also include other subbands. A subband is a different frequency-domain resource for carrying a reference signal. Exemplarily, a subband may be a resource element (RE), and each resource block (RB) may have some or all of the REs for carrying the downlink reference signal. The specific frequency-domain position for carrying the reference signal may be determined according to the configuration of the network side (such as the frequency-domain resources configured according to the above second information).

[0101] The first downlink reference signal and the second downlink reference signal received by the terminal device are from the first transmission and reception point (TRP) and the second TRP respectively, and the first TRP and the second TRP are TRPs that use (or need to use) the CJT method to transmit data to the terminal. The terminal device may receive the second information from the network side (such as the first TRP or the second TRP), and the second information is used to configure the terminal device to receive the first downlink reference signal and the second downlink reference signal.

[0102] Exemplarily, the second information may be reference signal resource configuration information, such as CSI-RS resource configuration information. Optionally, the second information may be carried in a radio resource control (RRC) message.

[0103] Specifically, the second information may configure the sequence, time-frequency resources, etc. of each of the first downlink reference signal and the second downlink reference signal. The terminal device may receive the first downlink reference signal and the second downlink reference signal according to the second information.

[0104] The first downlink reference signal and the second downlink reference signal configured by the second information may be reference signals carried on different reference signal resources, or reference signals carried on different reference signal resource sets, or the first downlink reference signal and the second downlink reference signal may be reference signals sent from different reference signal ports and carried on the same reference signal resource. The terminal device may specifically receive the first downlink reference signal and the second downlink reference signal respectively according to the configuration of the second information. This application does not limit the specific transmission method of the first downlink reference signal and the second downlink reference signal.

[0105] Optionally, the second information may further include CSI reporting configuration information. For example, the CSI reporting configuration information may configure reporting parameters, reference signal resource configuration associated with CSI reporting, etc. The terminal device may, according to the CSI reporting configuration information and based on the received multiple downlink reference signals, report relevant parameters to the network side for compensating the time-varying phase difference caused by frequency deviation between multiple TRPs.

[0106] The network side configures the terminal device to measure the downlink reference signals sent by multiple TRPs, so that the network side can obtain relevant parameters to compensate the time-varying phase difference caused by frequency deviation between multiple TRPs, improve the transmission performance of CJT, and thus increase the data transmission rate between the network side and the terminal device.

[0107] It should be understood that the terminal device may receive the downlink reference signals and feedback corresponding parameters only according to the configuration of the network side, and the terminal device does not need to know which TRP each reference signal comes from.

[0108] S302, the terminal device sends first information, where the first information indicates a first phase, and the first phase is obtained based on at least one of a first downlink reference signal or a second downlink reference signal.

[0109] The terminal device measures the received first downlink reference signal and second downlink reference signal, and may obtain the first phase.

[0110] In Embodiment 1, the first phase is a first phase change amount or a second phase change amount, where the first phase change amount is obtained based on the first downlink reference signal, and the second phase change amount is obtained based on the second downlink reference signal.

[0111] Specifically, the first phase change amount is the phase change amount obtained by measuring the first downlink reference signals received at different times. For example Figure 4 in the shown example, the terminal device measures the first downlink reference signals received at time t 1 and time t 2 respectively, and obtains the first phase change amount Δθ 1 , which can be expressed as:

[0112]

[0113] where is the phase obtained by measuring the first downlink reference signal received at measurement time t 1 , is the phase obtained by measuring the first downlink reference signal received at measurement time t 2 . This phase change amount Δθ 1 may be the first phase change amount. Similarly, the second phase change amount Δθ2 is the phase change amount obtained by measuring the second downlink reference signal received at different times. The terminal device measures the second downlink reference signal received at time t 1 and time t 2 respectively, and obtains the second phase change amount Δθ 2 , which can be expressed as:

[0114]

[0115] wherein, is the phase obtained by measuring the second downlink reference signal received at time t 1 , is the phase obtained by measuring the second downlink reference signal received at time t 2 . This phase change amount Δθ 2 may be the second phase change amount. It should be understood that this application is not limited thereto. The downlink reference signal (such as the first downlink reference signal, the second downlink reference signal) may also be carried at times other than time t 1 and time t 2 , and the time interval between two adjacent times is equal. The phase change amount (such as the first phase change amount, the second phase change amount) measured according to the corresponding downlink reference signal may be the average value of the phase change amounts obtained by measuring the downlink reference signal (such as the first downlink reference signal, the second downlink reference signal) between each adjacent time among multiple adjacent times. In addition, the phase change amount (such as the first phase change amount, the second phase change amount) may also be the average value of the phase change amounts obtained by measuring the corresponding downlink reference signal (such as the first downlink reference signal, the second downlink reference signal) on multiple subbands. For example, if the downlink reference signal is carried on M subbands, the terminal device may measure the downlink reference signal on these M subbands respectively to obtain the corresponding phase change amount. Taking the second downlink reference signal as an example, at time t 1 , the terminal device measures the second downlink reference signal on subband m and obtains the phase At time t 2 , the terminal device measures the second downlink reference signal on subband m and obtains the phase Then, the phase change amount measured by the terminal device on subband m through the second downlink reference signal is Then, the terminal device may average the phase change amounts measured on the M subbands to obtain the second phase change amount The first phase change amount can also be obtained in the same way.

[0116] Figure 4 In the example shown, both the first downlink reference signal and the second downlink reference signal are carried at time t 1 and time t 2Above, that is, the multiple moments carrying the first downlink reference signal and the second downlink reference signal are completely overlapped. However, the present application is not limited thereto. In one implementation manner, the multiple moments carrying the first downlink reference signal and the multiple moments carrying the second downlink reference signal may be partially overlapped or completely non - overlapped. For example, the first downlink reference signal may be carried at moment t 1 and moment t 2 , while the second downlink reference signal may be carried at moment t 3 and moment t 4 .

[0117] In the first embodiment, the first information sent by the terminal device may indicate the first phase change amount and the second phase change amount. The network side (such as the first TRP and / or the second TRP) receives the first information and determines the signal phase compensation amount between the first TRP and the second TRP according to the first information reported by the terminal device. This phase compensation amount is used to compensate for the phase difference that accumulates over time caused by the frequency deviation between the TRPs. After the first TRP and / or the second TRP perform phase compensation on the signal, the transmission performance of CJT can be improved. The specific way to perform phase compensation may be that the first TRP and the second TRP respectively perform signal phase compensation according to the first phase change amount and the second phase change amount reported by the terminal device. Or one of the first TRP or the second TRP may perform signal phase compensation. For example, one TRP may determine the difference between the first phase change amount and the second phase change amount based on the first phase reported by the terminal device, and perform signal phase compensation based on this difference. Taking one of the TRPs performing signal phase compensation as an example, the TRP performing signal phase compensation may determine the frequency deviation Δf between the two TRPs based on the difference between the first phase change amount and the second phase change amount, and then perform phase compensation. For example, for moment t, the phase compensation amount of the corresponding TRP is 2π×Δf×t.

[0118] The terminal device may obtain the CSI reporting configuration information sent by the network side. As introduced above, this CSI reporting configuration information may be included in the second information, but the present application is not limited thereto. This CSI reporting configuration information may also not be included in the second information and be sent to the terminal device by the network side. For example, the CSI reporting configuration information and the second information may be respectively sent to the terminal device by the network side. Or the CSI reporting configuration information is included in other information. Exemplarily, this CSI reporting configuration information may be carried in the RRC message. This CSI reporting configuration information may indicate the reporting parameters reported by the terminal device to the network side. For example, in the first embodiment, this CSI reporting configuration information may indicate that the terminal device reports the phase change amount obtained by measuring the downlink reference signal. Then the terminal device may determine that the first information sent to the network side includes the first phase change amount and the second phase change amount according to this CSI reporting configuration information.

[0119] Optionally, if, in addition to the first TRP and the second TRP, a third TRP is included to provide CJT services for the terminal device, the terminal device also receives a third downlink reference signal, which is carried on resources at multiple moments. The terminal device can measure the third downlink reference signal to obtain a third phase change amount. Specifically, reference can be made to the implementation manners in which the terminal device obtains the first phase change amount and the second phase change amount above, which will not be elaborated here. The first information sent by the terminal device also indicates the third phase change amount, that is, the first information indicates the first phase change amount, the second phase change amount, and the third phase change amount. The network side can determine the signal phase compensation amount between the first TRP and the second TRP according to the first information reported by the terminal device. This phase compensation amount is used to compensate for the phase difference that accumulates over time due to the frequency deviation between the three TRPs. The transmission performance of the CJT mode can be improved.

[0120] In Embodiment 2, the first phase is obtained according to the difference between the first phase change amount and the second phase change amount. As can be referred to the previous description, the terminal device can measure the first downlink reference signal and the second downlink reference signal respectively to obtain the first phase change amount Δθ 1 and the second phase change amount Δθ 2 . Furthermore, the difference Δθ 21 =Δθ 2 -Δθ 1 between the second phase change amount and the first phase change amount can be determined. The first phase in the first information reported by the terminal device is the difference Δθ 21 of this phase change amount. The network side (such as the first TRP and / or the second TRP) receives this first information and determines the signal phase compensation amount between the first TRP and the second TRP according to this first information. This phase compensation amount is used to compensate for the phase difference that accumulates over time due to the frequency deviation between the TRPs. After the first TRP and / or the second TRP perform phase compensation on the signal, data is transmitted to the terminal device in the CJT manner, and the transmission performance of the CJT can be improved. The specific compensation method can refer to the introduction in the previous text, which will not be elaborated here.

[0121] The terminal device can obtain the CSI reporting configuration information sent by the network side. The CSI reporting configuration information can indicate the type of measurement results reported by the terminal device to the network side. For example, in this embodiment, the CSI reporting configuration information can indicate that the terminal device reports the difference of the phase change amount. Then, the terminal device can determine that the first information sent to the network side includes the difference between the second phase change amount and the first phase change amount according to the CSI reporting configuration information.

[0122] Optionally, the terminal device further receives a third downlink reference signal, which is carried on resources at multiple moments. The multiple moments may be the same as the multiple moments carrying the first downlink reference signal and the second downlink reference signal. The first information further indicates a second phase, which is obtained based on the third downlink reference signal.

[0123] Exemplarily, the terminal device is provided with CJT services by three TRPs, which include a first TRP, a second TRP, and a third TRP. Therefore, in order to assist the network side in performing phase compensation, the terminal device receives a third downlink reference signal in addition to the first downlink reference signal and the second downlink reference signal, and the third downlink reference signal is sent by the third TRP. The network side may configure the terminal device to receive a corresponding number of downlink reference signals according to the number of TRPs participating in the terminal device's CJT as required.

[0124] Exemplarily, the first phase is the first phase change amount Δθ 1 and the second phase change amount Δθ 2 The difference between them, and the second phase is the first phase change amount Δθ 1 and the third phase change amount Δθ 3 The difference between them. Among them, the third phase change amount is obtained based on the third downlink reference signal. For example, the third phase change amount is the phase change amount obtained by measuring the third downlink reference signal at different moments.

[0125] When multiple TRPs (such as the above three TRPs) provide CJT services for the terminal device, the network side configures the terminal device to measure multiple downlink reference signals sent by the multiple TRPs, and the network side may notify the terminal device to use the phase change amount measured based on one of the multiple downlink reference signals as a reference to report the difference in the phase change amount. Exemplarily, the network device may send indication information to the terminal device, and the indication information is used to indicate which one of the multiple downlink reference signals is the reference downlink signal. The indication information may be included in the CSI reporting configuration information introduced above, but this application is not limited thereto, and the indication information may also be included in other information.

[0126] For example, in the implementation of this application, the indication information may indicate that the first downlink reference signal is the reference signal, and the indication information may include the resource identifier of the first downlink reference signal. According to the indication information, the terminal device may determine that the phase change amount measured from the first downlink reference signal is used as the reference phase change amount among the multiple downlink reference signals. Specifically, after the terminal device determines the corresponding multiple phase change amounts measured from the multiple downlink reference signals, the first phase change amount Δθ 1As a reference phase change amount, the difference in the phase change amount is obtained after comparing it with other phase change amounts respectively. For example, the terminal device can obtain the second phase change amount Δθ 2 and the first phase change amount Δθ 1 The difference between them is the first phase. The terminal device can also obtain the third phase change amount Δθ 3 and the first phase change amount Δθ 1 The difference between them is the second phase. The first information sent by the terminal device to the network device indicates the first phase and the second phase.

[0127] According to the above two implementation manners, the terminal device receives multiple downlink reference signals and sends the first information, where the first information indicates the phase change amount obtained based on measuring the multiple downlink reference signals (such as in the first implementation manner above) or the difference in the phase change amount obtained (such as in the second implementation manner above). After the network side obtains the first information, it can determine the signal phase compensation amount between the multiple TRPs corresponding to the multiple reference signals. In order to compensate for the phase difference that accumulates over time due to the frequency deviation between TRPs based on the phase compensation amount, the transmission performance of CJT can be improved.

[0128] Next, the specific manner in which the first information indicates the first phase will be exemplarily described.

[0129] In the first example, the first information includes the quantization bits of the first phase.

[0130] The number of bits occupied by the first phase in the first information can be predefined or preconfigured by signaling (such as configured through the CSI reporting configuration information in the foregoing text), and this number of bits is the quantization bit number of the first phase. After the terminal device measures the first phase, it can quantize the first phase according to this number of bits to obtain the quantization bits of the first phase and report them to the network side through the first information.

[0131] Specifically, the terminal device can quantize the first phase in a uniform quantization manner or a non-uniform quantization manner.

[0132] For example, the terminal device quantizes the first phase in a uniform quantization manner, that is, quantizes the first phase with an equal quantization interval, and this quantization interval is the unit phase of quantization. This quantization interval can be predefined. The quantization bits of the first phase in the first information include the bit for indicating whether the first phase is positive or negative, and the quantization bits also include the binary representation of the first quantity, where the first quantity is the number of quantization intervals included in the first phase.

[0133] After the terminal device measures the first phase, it can quantize the first phase according to a certain determined quantization interval Δθ uQuantize it according to the quantization number of bits, and the quantization bits may further include 1 bit for indicating whether the first phase is positive or negative. For example, the highest bit of the quantization bits is used to indicate the sign of the first phase, and the subsequent bits are used to indicate the binary representation of the above-mentioned first quantity. Taking the quantization of the first phase change amount Δθ 1 as an example, the terminal device can determine the first quantity K in the following way:

[0134]

[0135] In the above formula, the symbol |·| represents taking the absolute value, represents rounding down.

[0136] For example, Δθ 1 If the number of quantization bits is 4, then the first bit is used to indicate whether Δθ 1 is positive or negative. If this bit is 1, it means Δθ 1 is positive, and if it is 0, it means Δθ 1 is negative. The subsequent 3 bits are the binary representation of K. If Δθ 1 is positive and K = 6, then the quantization bits of the first phase are 1110. After receiving this first information, the network side can obtain the quantization interval Δθ u according to the first quantity K, and can get Δθ 1 = K × Δθ u .

[0137] Exemplarily, the terminal device can specifically adopt but is not limited to the following three methods (Method 1 to Method 3) to determine the quantization interval Δθ u .

[0138] Method 1: The protocol predefines the quantization interval as Δθ u , and after determining the first phase, the terminal device can quantize the first phase according to the predefined quantization interval.

[0139] Method 2: The protocol predefines multiple candidate quantization intervals. The network side (such as the first TRP and / or the second TRP) can send the third information to the terminal device. This third information is used to indicate one quantization interval among the multiple candidate quantization intervals, and notify the terminal device to use this quantization interval to quantize the first phase. For example, the third information includes the identifier of this quantization interval, and the terminal device determines the quantization interval Δθ u corresponding to this identifier among the predefined multiple candidate quantization intervals according to the identifier included in the third information, and the terminal device uses this quantization interval to quantize the first phase. Exemplarily, this third information can be carried in the CSI reporting configuration information mentioned above, or this third information can be carried in other information sent by the network side to the terminal device. This application does not make any limitations in this regard.

[0140] Method 3: The protocol pre - defines multiple candidate quantization intervals, and the terminal device determines a quantization interval Δθ for quantization from the pre - defined multiple candidate quantization intervals. u , the terminal device quantizes the first phase using this quantization interval, and the terminal device also sends the fourth information to the network device, where the fourth information is used to indicate the quantization interval Δθ. u , so that the network side can determine the quantization interval adopted by the terminal device according to the fourth information. Exemplarily, the fourth information can be included in the above - mentioned first information.

[0141] For another example, the terminal device can also quantize the first phase in a non - uniform quantization manner, that is, the quantization intervals used for quantization are not equal.

[0142] In Example 2, the first information includes the identifier of the phase gear corresponding to the first phase and the quantization bits of the first duration.

[0143] For the above - mentioned Embodiment 1, taking the first phase as the first phase change amount Δθ 1 as an example, the first phase change amount is the phase change amount obtained by the terminal device from the first downlink reference signal at the measurement time t 1 and the time t 2 . The frequency deviation corresponding to the first phase change amount is Δf 1 =Δθ 1 / 2π(t 2 -t 1 ). Multiple candidate phase gears and corresponding identifiers can be pre - defined. For example, multiple candidate phase gears can include π / 4, π / 2, π, and the corresponding identifiers are 0, 1, 2 in sequence. The terminal device can determine a phase gear, such as π / 2, from multiple phase change amounts according to the first phase change amount Δθ 1 , and the terminal device can determine that when Δθ 1 is scaled to π / 2, the time change amount t 1 -t 2 is scaled to the first duration Δt 1 , that is: 1

[0144]

[0145] The first information sent by the terminal device can include the identifier of the phase gear π / 2, that is, identifier 1, and the quantization bits of the first duration Δt 1 . The specific quantization method can refer to the quantization method of the first phase in Example 1, which will not be elaborated here. The number of quantization bits and / or quantization interval of the first duration can be pre - defined or indicated by the network device through signaling (such as CSI reporting configuration information). Exemplarily, Δf 1 ​= 0.2 Hz, the terminal device can determine that the phase change amount after a duration of 1250 ms (i.e., an example of the first duration) is π / 2. Then, the terminal device can use the quantization interval corresponding to the duration (such as the quantization interval is 100 ms) to quantize the first duration of 1250 ms to obtain 12, and convert it to binary representation, which is the quantization bit of the first duration. The first information sent by the terminal device includes identifier 1 and the quantization bit of the first duration.

[0146] For the above Embodiment 2, the first phase is the difference Δθ between the second phase change amount and the first phase change amount 21 , that is, the measurement time t of the terminal device 1 and the first reference signal and the second reference signal at time t 2 The difference in the phase change amount obtained. The frequency deviation corresponding to the difference in the phase change amount is The terminal device can determine a phase gear among multiple candidate phase gears, and according to Determine the duration (i.e., another example of the first duration) passed when the phase change amount is at this phase gear. The terminal device can quantize this duration to obtain the quantization bit of this duration. The first information sent by the terminal device can include the identifier of the phase gear determined by the terminal device and the quantization bit of this duration.

[0147] The above introduced that the terminal device can select a phase gear from multiple candidate phase gears, but the present application is not limited thereto. In another way, a phase gear can be predefined or preconfigured by the network side through signaling (such as preconfigured by reporting measurement information through CSI). After measurement, the terminal device can determine the frequency deviation, and according to this frequency deviation, determine the duration to which the corresponding time change amount shrinks / releases when the phase change amount shrinks / releases to this phase gear, that is, the first duration. The first information sent by the terminal device includes the quantization bit of the first duration.

[0148] If the first information further includes the second phase and / or other phases, the same indication method as that for the first phase can be used for indication, which will not be elaborated here.

[0149] The network side and the terminal device can reach a consensus on the specific indication method of the first information, so that the terminal device uses the corresponding indication method to indicate the first phase, and the network side (such as the first TRP and / or the second TRP) can use the corresponding method to interpret the first information and obtain the first phase. This can reduce the situation of information transmission errors caused by the lack of consensus on the indication method.

[0150] The duration corresponding to the first phase can be predefined. For example, this duration can be the above time t 1 to time t 2The duration. Alternatively, the first information further indicates a first duration, and the first phase is specifically the amount of change in phase within the first duration, or the difference in the amount of change in phase within the first duration.

[0151] For example, the specific way in which the first information indicates the first duration may be that the first information includes the quantization bits of the first duration. For example, the first information may include a second quantity, and the second quantity is the number of unit times included in the first duration. Exemplarily, the unit time may be the duration of a time domain symbol, milliseconds, seconds, etc. Alternatively, the first information may include a second identifier corresponding to the first duration. Enabling the network device and the terminal device to reach a consensus on the specific indication method of the first information can reduce the situation of information transmission errors caused by failure to reach a consensus on the indication method.

[0152] It should be noted that the above has introduced that after the terminal device receives the first downlink reference signal and the second downlink reference signal, it reports the first phase (the first phase may be the amount of change in phase or the difference in the amount of change in phase) to the network side. The network side can determine the phase compensation amount according to the first phase to compensate for the phase difference that accumulates over time due to the frequency deviation between TRPs. This application also provides another embodiment. The terminal device receives the first downlink reference signal and the second downlink reference signal, and the terminal device sends the first information, and the first information indicates the first frequency. The first frequency is determined according to at least one of the first downlink reference signal or the second downlink reference signal.

[0153] In one way, the first frequency may be the first frequency deviation or the second frequency deviation. The first frequency deviation is obtained according to the first downlink reference signal. The first frequency deviation is an estimated value of the deviation between the carrier frequency of the first TRP and a certain standard frequency. That is, according to the method introduced above, the first frequency deviation can be expressed as:

[0154]

[0155] The second frequency deviation is obtained according to the second downlink reference signal. The second frequency deviation is an estimated value of the deviation between the carrier frequency of the second TRP and a certain standard frequency. The second frequency deviation can be expressed as:

[0156]

[0157] In another way, the first frequency may be the difference between the first frequency deviation and the second frequency deviation The can be obtained through the following method:

[0158]

[0159] The terminal device can report the first frequency to the network side. After the network side obtains the first frequency, it can compensate for the time-varying phase difference caused by the frequency deviation between multiple TRPs. Specifically, the terminal device can obtain the CSI reporting configuration information sent by the network side, and the CSI reporting configuration information can indicate the reporting parameters of the terminal device. For example, if the CSI reporting configuration information indicates that the terminal device reports the frequency deviation, the first information sent by the terminal device includes the first frequency deviation and the second frequency deviation. Alternatively, the CSI reporting configuration information can indicate that the terminal device reports the difference in frequency deviation, and the first information sent by the terminal device includes the difference between the first frequency deviation and the second frequency deviation.

[0160] The first information may include the quantization bits of the first frequency. The terminal device can determine the quantization interval of the frequency, quantize the first frequency, and send it to the network side through the first information. Specifically, the manner in which the terminal device determines the quantization bits of the first frequency can be implemented by referring to the manner in which the terminal device determines the quantization bits of the first phase introduced in Example 1 in the foregoing text, and will not be elaborated herein.

[0161] It should be understood that in this application, the same or similar parts in each embodiment can be referred to and implemented with each other, and will not be elaborated one by one.

[0162] In one implementation manner, the first downlink reference signal and the second downlink reference signal received by the terminal device can be pre-compensated reference signals. The following is combined with Figure 5 for description. Figure 5 FIG. 500 is a schematic flowchart of a communication method provided by an embodiment of the present application. The method may include but is not limited to the following S501 to S503.

[0163] S501, the terminal device sends an uplink reference signal.

[0164] Exemplarily, the uplink reference signal may be a sounding reference signal (SRS), or other uplink reference signals.

[0165] Correspondingly, the first TRP and the second TRP respectively receive the uplink reference signal from the terminal device. The uplink reference signal is used to determine the pre-compensation coefficient. The first TRP receives the received signal Y 0 at time t UE→1 for the uplink reference signal, and exemplarily, Y UE→1 can be expressed as:

[0166]

[0167] where h 1 is the air interface channel response between the terminal device and the first TRP, and η1 , r represents the receiving channel response of the first TRP, including the amplitude, phase and delay of the receiving channel, Δf 1 represents the frequency deviation of the carrier frequency of the first TRP compared to the standard frequency, Δτsyn 1 indicates the deviation of the timing of the first TRP from the standard time. k is the subband identifier. It should be noted that the expressions of the received / transmitted signals of the reference signal in this application are all based on the signal on subband k as an example to illustrate the scheme, and the symbols representing the received / transmitted signals, channel response, etc. all omit the subband identifier k. In addition, other subbands can be implemented with subband k as a reference.

[0168] The second TRP at time t 0 The received signal obtained by receiving the uplink reference signal is Y UE→2 , for example, Y UE→2 can be expressed as:

[0169]

[0170] where h 2 is the air interface channel response between the terminal device and the second TRP, η 2 , r represents the response of the second TRP receiving channel, including the amplitude, phase and delay of the receiving channel, Δf 2 Indicates the frequency deviation of the carrier frequency of the second TRP compared to the standard frequency, Δτsyn 2 Indicates the deviation of the timing of the second TRP compared to the standard time.

[0171] After the first TRP and the second TRP receive the uplink reference signal, the pre-compensation coefficient C can be determined UL , the pre-compensation coefficient can be used to pre-compensate the downlink reference signal sent in S502 below. Exemplarily, the compensation coefficient C UL can be expressed as:

[0172]

[0173] To determine the pre-compensation coefficient, the first TRP can receive the received signal Y through the return link UE→1 Interact with the second TRP, which calculates the pre-compensation coefficient, or the second TRP can receive the received signal Y through the return link UE→2 The first TRP is used to calculate the pre-compensation coefficient, which is not limited in this application.

[0174] S502, the first TRP and the second TRP send a first downlink reference signal and a second downlink reference signal to the terminal device respectively.

[0175] The first TRP (and / or the second TRP) can perform pre-compensation on the first downlink reference signal (and / or the second downlink reference signal) according to the pre-compensation coefficient C UL and the calibration coefficient C between the TRPs, where the calibration coefficient C between the first TRP and the second TRP can be obtained by the method of mutually transmitting calibration pilots (or reference signals) through the air interface as introduced above. For specific details, please refer to the relevant technical introduction in the previous text and will not be elaborated here.

[0176] The specific pre-compensation method for the downlink reference signal can be that the first TRP compensates the first downlink reference signal according to the calibration coefficient C UL and C, or it can be that the second TRP compensates the first downlink reference signal according to the calibration coefficient C UL and C, or it can be that the first TRP and the second TRP negotiate and then compensate the first downlink reference signal and the second downlink reference signal respectively. This application does not make any limitations in this regard.

[0177] Taking the second TRP compensating the second downlink reference signal based on the pre-compensation coefficient C UL and the calibration coefficient C as an example.

[0178] The second downlink reference signal sent by the second TRP can be expressed as

[0179]

[0180] The corresponding received signal of the terminal device is

[0181]

[0182] where η 2 ,t represents the transmit channel response of the second TRP, including the amplitude, phase, and delay of the transmit channel. The terminal device determines the second phase change amount Δθ corresponding to the second downlink reference signal based on the moment t 2 (i.e., t = t in the above formula 2 ) and the moment t 1 (i.e., t = t in the above formula 1 ) of the received signal. 2 .

[0183] The first downlink reference signal sent by the first TRP is s DL-RS1 , and the corresponding received signal of the terminal device is

[0184]

[0185] The terminal device is based on the moment t 2 (i.e., t = t in the above formula 2 ) and the moment t 1 (i.e., t = t in the above formula 1The received signal can determine the second phase change amount Δθ 1 .

[0186] For the above received signals Y 1→UE and Y 2→UE Performing the following processing can obtain:

[0187]

[0188] where t TRP is the time for calibration between TRPs and obtaining the calibration coefficient C. It can be seen from the above formula that according to multiple times, such as time t 2 and time t 1 , the difference in the phase change amount measured from the received first downlink reference signal and the second downlink reference signal is Δθ 21 = 2π·(Δf 2 -Δf 1 )·(t 2 -t 1 ). The terminal device can report the difference in the phase change amount to the network side through the first information in S503, or the terminal device can report the first phase change amount and the second phase change amount to the network side through the first information in S503, and the network side determines the difference in the phase change amount. So that the network side can determine the signal phase compensation amount between the first TRP and the second TRP according to the first information reported by the terminal device, and this phase compensation amount is used to compensate for the phase difference that accumulates over time caused by the frequency deviation between TRPs. After the first TRP and / or the second TRP perform phase compensation on the signal, the transmission performance of the CJT mode can be improved.

[0189] In S503, the terminal device sends the first information, and the first information includes the first phase.

[0190] This S503 can specifically refer to Figure 3 S302 in the illustrated embodiment for implementation, which will not be elaborated here.

[0191] In one implementation, the first information includes the first phase change amount Δθ 1 reported by the terminal device to the network side and the second phase change amount Δθ 2 . The network side can determine the difference between the first phase change amount Δθ 1 and the second phase change amount Δθ 2 , Δθ 21 = Δθ 2 -Δθ 1 . The network side can perform phase compensation on the signals of TRP1 and / or TRP2 based on the difference in the phase change amount. Exemplarily, the network side can obtain an estimated value of the frequency deviation based on the difference in the phase change amount Exemplarily, can be expressed as:

[0192]

[0193] Based on the estimated value of the frequency deviation, the network side can perform phase compensation on the signal of TRP1 and / or TRP2. Taking the phase compensation on TRP1 as an example, at time t, the phase that needs to be compensated for TRP1 is 2π×Δf×t.

[0194] In another implementation, the terminal device may report the difference Δθ between the first phase change amount and the second phase change amount to the network side through the first information 21 , the network side performs phase compensation on the signal of TRP1 and / or TRP2 based on the difference. Exemplarily, the network side estimates the frequency deviation based on the difference Phase compensation is performed on the signal of TRP1 and / or TRP2 based on the estimated value of the frequency deviation. After the phase compensation of the signal, when the first TRP and the second TRP use CJT to transmit data to the terminal device, the transmission performance of CJT can be improved.

[0195] In one implementation, the time interval between any one of the first downlink reference signal and the second downlink reference signal and the uplink reference signal is less than or equal to a preset time interval. In other words, the minimum transmission interval between the downlink reference signal and its associated uplink reference signal can be specified to avoid the situation where the pre-compensation coefficient is inaccurate due to a too long interval time.

[0196] In one embodiment, if Figure 6 As shown in the figure, the network side can configure the terminal equipment to measure the downlink reference signals sent by multiple TRPs and report relevant information between two adjacent inter-TRP time calibration operations of multiple TRPs participating in CJT, so that the terminal equipment can assist TRP in clock synchronization, so as to compensate for the signal phase difference between TRPs caused by the time-varying inter-TRP calibration coefficients between two adjacent inter-TRP calibrations, thereby improving the transmission performance and reliability of CJT.

[0197] Above Figure 3 and Figure 5The described embodiment introduces that a terminal device receives multiple downlink reference signals sent by multiple TRPs, and by measuring and reporting the phase change amount or the difference of the phase change amounts, it assists the network side to compensate for the phase difference that accumulates over time due to the frequency deviation between TRPs. In another implementation manner, the network side can configure multiple terminal devices to respectively receive the downlink reference signals sent by different TRPs. These multiple terminal devices respectively measure the received downlink reference signals and respectively report to the network side the phase change amounts obtained by measuring the received downlink reference signals. For example, the first terminal device receives the first downlink reference signal and reports the first phase change amount obtained by measuring the first downlink reference signal, and the second terminal device receives the second downlink reference signal and reports the second phase change amount obtained by measuring the second downlink reference signal. After the network side obtains the first phase change amount and the second phase change amount, it determines the phase compensation amount to compensate for the phase difference that accumulates over time due to the frequency deviation between the first TRP that sends the first downlink reference signal and the second TRP that sends the second downlink reference signal, so as to improve the transmission performance of CJT.

[0198] It can be understood that, in order to implement the functions in the above embodiment, the TRP and the terminal on the network side include the corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should easily realize that, combining the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application scenario and design constraint conditions of the technical solution.

[0199] Figure 7 and Figure 8 FIG. is a schematic structural diagram of a possible communication device provided by the embodiment of the present application. These communication devices can be used to implement the functions of the terminal device or the TRP in the above method embodiment, and thus can also achieve the beneficial effects possessed by the above method embodiment. In the embodiment of the present application, the communication device can be one of the terminals 120a - 120j shown in Figure 1 FIG., or can be the network device 110a or 110b shown in Figure 1 FIG., or can also be a module (such as a chip or a chip system) applied to the terminal or the network device.

[0200] The communication device 700 includes a transceiver unit 720, and the transceiver unit 720 can be used to receive or send information. The communication device 700 can also include a processing unit 710, and the processing unit 710 can be used to process instructions or data to implement corresponding operations.

[0201] It should be understood that when the communication device 700 is a chip configured in (or for) a communication device, the transceiver unit 720 in the communication device 700 can be an input / output interface or circuit of the chip, and the processing unit 710 in the communication device 700 can be a processor in the chip.

[0202] Optionally, the communication device 700 may further include a storage unit, which can be used to store instructions or data, and the processing unit 710 can execute the instructions or data stored in the storage unit to enable the communication device to perform corresponding operations.

[0203] The communication device 700 can be used to implement the functions of the terminal device or the TRP in the method embodiments described above Figure 3 , Figure 5 as shown.

[0204] When the communication device 700 is used to implement Figure 3 the functions of the terminal device in the method embodiments shown: The transceiver unit 720 is used to receive a first downlink reference signal and a second downlink reference signal, and both the first downlink reference signal and the second downlink reference signal are carried on resources at multiple moments. The processing unit 710 is used to determine first information, and the first information indicates a first phase. Wherein, the first phase is obtained according to at least one of the first downlink reference signal or the second downlink reference signal. The transceiver unit 720 is further used to send the first information.

[0205] When the communication device 700 is used to implement Figure 3 the functions of the TRP in the method embodiments shown: The transceiver unit 720 is used to send a first downlink reference signal, and the first downlink reference signal is carried on resources at multiple moments, and the first downlink reference signal is used to obtain a first phase. The transceiver unit 720 is further used to receive first information, and the first information indicates a first phase. The processing unit 720 is used to determine the first phase according to the first information.

[0206] For a more detailed description of the above processing unit 710 and transceiver unit 720, reference can be made to the relevant descriptions in the method embodiments shown Figure 3 as shown.

[0207] It should be understood that the transceiver unit 720 in the communication device 700 can be implemented through a communication interface (such as a transceiver, a transceiver circuit, an input / output interface, or a pin, etc.). When the communication interface is a transceiver, the transceiver can be composed of a receiver and / or a transmitter. The processing unit 710 in the communication device 700 can be implemented through at least one processor, and the processing unit 710 in the communication device 700 can also be implemented through at least one logic circuit. Optionally, the communication device 700 further includes a storage unit, and the storage unit can be implemented by a memory.

[0208] As Figure 8 shown, the communication device 800 includes a processor 810 and an interface circuit 820. The processor 810 and the interface circuit 820 are coupled to each other. It can be understood that the interface circuit 820 can be a transceiver or an input / output interface. Optionally, the communication device 800 may further include a memory 830 for storing instructions executed by the processor 810 or input data required for the processor 810 to run instructions or data generated after the processor 810 runs instructions.

[0209] In one implementation, the memory 830 may also be integrated in the processor 810 or independent of the processor 810.

[0210] When the communication device 800 is used to implement Figure 3 the method shown, the processor 810 is used to implement the functions of the above-mentioned processing unit 710, and the interface circuit 820 is used to implement the functions of the above-mentioned transceiver unit 720.

[0211] When the above communication device is a chip applied to a terminal device, the terminal device chip can implement the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, and this information is sent by the network device to the terminal device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device, and this information is sent by the terminal device to the network device.

[0212] When the above communication device is a module applied to a network device, the network device module can implement the functions of the TRP in the above method embodiments. The network device module receives information from other modules (such as a radio frequency module or an antenna) in the network device, and this information is sent by the terminal device to the network device; or, the network device module sends information to other modules (such as a radio frequency module or an antenna) in the network device, and this information is sent by the network device to the terminal device. Here, the network device module can be a baseband chip of the network device, or a DU or other module, and here the DU can be a DU under an open radio access network (O-RAN) architecture.

[0213] It can be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), 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.

[0214] The method steps in the embodiments of the present application may be implemented in hardware or in software instructions executable by a processor. The software instructions may be composed of corresponding software modules, and the software modules may be stored in a 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 disks, removable hard disks, CD-ROMs, 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 may also be a component of the processor. The processor and the storage medium may be located in an ASIC. Additionally, the ASIC may be located in an access network device or a terminal device. The processor and the storage medium may also exist as discrete components in the access network device or the terminal device.

[0215] According to the method provided by the embodiments of the application, the embodiments of the present application also provide a computer program product, which includes: computer program code, when the computer program code is executed by one or more processors, it causes a device including the processor to execute Figure 3 、 Figure 5 the method in the illustrated embodiments.

[0216] In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer 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 executed 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 devices.

[0217] According to the method provided by the embodiments of the present application, the embodiments of the present application further provide a computer-readable storage medium, which stores the above computer program or instructions. When the computer program or instructions are run by one or more processors, the device including the processor is caused to execute Figure 3 , Figure 5 the method in the embodiments shown.

[0218] For example, the above computer program or instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center integrating one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0219] According to the method provided by the embodiments of the present application, the embodiments of the present application further provide a communication system, including one or more of the foregoing terminal devices. The system can further include one or more of the foregoing TRPs.

[0220] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the devices described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0221] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of this solution.

[0222] In various embodiments of the present application, without special instructions and logical conflicts, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0223] As described above, the above are only specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: receiving a first downlink reference signal and a second downlink reference signal, where the first downlink reference signal and the second downlink reference signal are both carried on resources at multiple time instants; Sending first information, wherein the first information indicates a first phase; The first phase is obtained according to at least one of the first downlink reference signal or the second downlink reference signal.

2. The method according to claim 1, characterized in that The first phase is obtained according to at least one of the first downlink reference signal or the second downlink reference signal, including: The first phase is obtained according to the difference between the first phase change amount and the second phase change amount, or, The first phase is a first phase change amount or a second phase change amount, The first phase change amount is obtained according to the first downlink reference signal, and the second phase change amount is obtained according to the second downlink reference signal.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: receiving a third downlink reference signal, where the third downlink reference signal is carried on resources at the multiple time instants; The first information further indicates a second phase, and the second phase is obtained according to the third downlink reference signal.

4. The method according to claim 3, characterized in that The first phase is obtained according to the difference between the first phase change amount and the second phase change amount, and the second phase is obtained according to the difference between the first phase change amount and the third phase change amount, The first phase change amount is obtained according to the first downlink reference signal, the second phase change amount is obtained according to the second downlink reference signal, and the third phase change amount is obtained according to the third downlink reference signal.

5. The method according to any one of claims 1 to 4, characterized in that The first information includes quantization bits of the first phase, where the quantization bits are obtained according to the first phase and the quantization interval. The quantization interval is indicated by third information from a network device; or, The quantization interval is determined by a terminal device, and the first information further includes fourth information, and the fourth information is used to indicate the quantization interval.

6. The method according to any one of claims 1 to 5, characterized in that The first information further indicates a phase position and a first duration corresponding to the first phase, and the phase position and the first duration are used to determine the first phase.

7. The method according to any one of claims 1 to 6, characterized in that Before receiving the first downlink reference signal and the second downlink reference signal, the method further includes: An uplink reference signal is sent, wherein the first downlink reference signal and the second downlink reference signal are related to the uplink reference signal.

8. The method according to claim 7, characterized in that The uplink reference signal is used to determine a pre-compensation coefficient, and the first downlink reference signal and the second downlink reference signal are reference signals pre-compensated according to the pre-compensation coefficient.

9. The method according to claim 7 or 8, characterized in that: A time interval between any one of the first downlink reference signal and the second downlink reference signal and the uplink reference signal is less than or equal to a preset time interval.

10. The method according to any one of claims 1 to 9, characterized in that The first downlink reference signal comes from the first transmitting and receiving point TRP, and the second downlink reference signal comes from the second TRP.

11. The method according to claim 10, characterized in that After sending the first information, the method further includes: Receive data from the first TRP and the second TRP jointly coherently transmitted, and the data of the joint coherent transmission is obtained according to the first phase processing.

12. A communication method, characterized in that: include: Sending a first downlink reference signal, where the first downlink reference signal is carried on resources at multiple time instants, and the first downlink reference signal is used to obtain a first phase; First information is received, the first information indicating a first phase.

13. The method according to claim 12, characterized in that The method further comprises: Send second information, where the second information is used to configure the terminal device to receive the first downlink reference signal and a second downlink reference signal, where the second downlink reference signal is carried on resources at the multiple time moments, and the first downlink reference signal and the second downlink reference signal are used to obtain the first phase.

14. The method according to claim 13, characterized in that The first phase is the difference between the first phase change amount and the second phase change amount, or, The first phase is a first phase change amount or a second phase change amount, The first phase change amount is obtained according to the first downlink reference signal, and the second phase change amount is obtained according to the second downlink reference signal.

15. The method according to claim 14, characterized in that The first information further indicates a second phase, The second phase is the difference between the first phase change amount and the third phase change amount; or, The second phase is a third phase variation, The third phase change amount is obtained according to a third downlink reference signal, and the third downlink reference signal is a downlink reference signal configured for the terminal device and carried on the resources at the multiple time moments.

16. The method according to any one of claims 12 to 15, characterized in that The first information includes quantization bits of the first phase, where the quantization bits are obtained according to the first phase and the quantization interval. The quantization interval is indicated by third information from a network device; or, The quantization interval is determined by a terminal device, and the first information further includes fourth information, and the fourth information is used to indicate the quantization interval.

17. The method according to any one of claims 12 to 16, characterized in that The first information further indicates a phase position and a first duration corresponding to the first phase, and the phase position and the first duration are used to determine the first phase.

18. The method according to any one of claims 12 to 17, characterized in that Before sending the first downlink reference signal, the method further includes: An uplink reference signal is received, wherein the first downlink reference signal is related to the uplink reference signal.

19. The method according to claim 18, characterized in that The method further comprises: A pre-compensation coefficient is determined according to the uplink reference signal, wherein the first downlink reference signal is a reference signal pre-compensated according to the pre-compensation coefficient.

20. The method according to claim 18 or 19, characterized in that The time interval between the first downlink reference signal and the uplink reference signal is less than or equal to a preset time interval.

21. The method according to claim 20, characterized in that The method is performed by the first TRP, and after sending the first information, the method further includes: Send data for joint coherent transmission with the second TRP, wherein the data for joint coherent transmission is obtained based on the first phase processing.

22. A communication method, characterized in that: include: receiving a first downlink reference signal and a second downlink reference signal, where the first downlink reference signal and the second downlink reference signal are both carried on resources at multiple time instants; Sending first information, wherein the first information indicates a first frequency; The first frequency is obtained according to at least one of the first downlink reference signal or the second downlink reference signal.

23. A communication method, characterized in that: include: Sending a first downlink reference signal, where the first downlink reference signal is carried on resources at multiple time instants, and the first downlink reference signal is used to acquire a first frequency; First information is received, the first information indicating a first frequency.

24. A communication device, characterized in that: Used to implement the method according to any one of claims 1 to 11 and 22.

25. The device according to claim 24, characterized in that The device includes a terminal device or a chip.

26. A communication device, characterized in that: Used to implement the method according to any one of claims 12 to 21 and 23.

27. The device according to claim 26, characterized in that The device includes a network device or a chip.

28. A communication device, characterized in that: comprising at least one processor coupled to a memory; The memory is used to store programs or instructions; The at least one processor is configured to execute the program or instruction so that the apparatus implements the method according to any one of claims 1 to 11 and 22, or so that the apparatus implements the method according to any one of claims 12 to 21 and 23.

29. A computer-readable storage medium comprising a computer program which, when executed by one or more processors, causes an apparatus comprising the processor to perform the method according to any one of claims 1 to 23.

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