Signal transmission method and communication apparatus

Abstract

Provided in the present application are a signal transmission method and a communication apparatus. The method comprises: a terminal device receiving a plurality of downlink reference signals; and the terminal device sending first information, the first information being used for indicating at least one delay amount, wherein one of the at least one delay amount is the difference between estimated delay values that are obtained by means of measuring two of the plurality of downlink reference signals, or one of the at least one delay amount is an estimated delay value that is obtained by means of measuring one of the plurality of downlink reference signals. Therefore, the communication performance can be improved.

Description

Signal transmission method and communication device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 20, 2023, with application number 202311553376.0 and application name “Signal Transmission Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more particularly, to a signal transmission method and a communication device. Background Art

[0003] Coherent joint transmission (CJT) involves multiple network devices using a joint channel formed by channels between them and terminal devices to calculate joint transmission weights and transmit the same data stream to the terminal device. This enables coherent superposition of signals from multiple network devices and coherent cancellation of interference at the terminal device, improving the terminal device's received signal to interference and noise ratio (SINR), thereby increasing the data transmission rate between the network devices and the terminal device.

[0004] However, achieving coherent joining requires ensuring that network devices share the same carrier frequency and synchronized signal phases. In many scenarios, different network devices do not share a common clock source, resulting in timing deviations between network devices, which can affect CJT transmission performance.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a signal transmission method and a communication device, which can improve communication performance.

[0007] In a first aspect, a signal transmission method is provided, which can be executed by a terminal device or a module (such as a chip or chip system) configured in (or used for) the terminal device. The following description takes the execution of the method by the terminal device as an example.

[0008] The method includes: a terminal device receives a plurality of downlink reference signals; the terminal device sends first information, where the first information is used to indicate at least one delay amount.

[0009] In the first embodiment, one of the at least one delay amount is a difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals.

[0010] In the second embodiment, one of the at least one delay amount is a delay estimation value obtained by measuring one downlink reference signal among the multiple downlink reference signals.

[0011] Exemplarily, the multiple downlink reference signals come from multiple TRPs, wherein one downlink reference signal is sent by one TRP.

[0012] According to the above solution, a terminal device receives multiple downlink reference signals and transmits first information indicating the delay amount obtained by measuring the multiple downlink reference signals. After the network side obtains the first information, it can compensate for the phase difference that varies between different subcarriers due to the different timing offsets between TRPs. This can improve the transmission performance of CJT, thereby increasing the data transmission rate between the network device and the terminal device, thereby improving the communication performance of the network.

[0013] With reference to the first aspect, in certain implementations of the first aspect, for embodiment 1, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N-1 delay amounts, where N is a positive integer. Alternatively, for embodiment 2, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N delay amounts.

[0014] The manner in which the first information indicates at least one delay amount may include but is not limited to the following manners:

[0015] In one embodiment, the first information is used to indicate at least one delay amount, including: the first information includes a quantization bit for each delay amount, wherein the quantization bit is obtained based on the delay amount and the quantization interval, and the quantization interval is indicated by the network device through signaling; or, the quantization interval is determined by the terminal device, and the first information is also used to indicate the quantization interval.

[0016] In another embodiment, the first information is used to indicate at least one time delay, including: the first information indicates a phase position corresponding to each time delay in the at least one time delay and a bandwidth corresponding to the phase position.

[0017] According to the above embodiment, the network and the terminal device can reach a consensus on the specific indication method for the first information, so that the terminal device can use the corresponding indication method to indicate the delay amount, and the network (such as the first TRP and / or the second TRP) can use the corresponding method to interpret the first information and obtain the delay amount. This can reduce the indication overhead and reduce the possibility of information transmission errors caused by not reaching a consensus on the indication method.

[0018] In combination with the first aspect, in certain implementations of the first aspect, one of the at least one delay amounts occupies M bits in the first information, where M is predefined or preconfigured by the network device for the terminal device through signaling.

[0019] According to the above solution, the network side and the terminal device can reach a consensus on the number of bits occupied by a delay amount in the first information, thereby reducing the situation where information transmission errors are caused by failure to reach a consensus.

[0020] In combination with the first aspect, in some implementations of the first aspect, the method further includes: the terminal device receives second information, where the second information is used to configure reporting of the at least one delay amount obtained by measuring the multiple downlink reference signals.

[0021] The second information may specifically indicate a reporting parameter reported by the terminal device to the network side. For example, for the first embodiment, the second information indicates that the reporting parameter reported by the terminal device is a delay estimation value obtained by measuring multiple downlink reference signals. For the second embodiment, the second information indicates that the reporting parameter reported by the terminal device is a difference between delay estimation values ​​obtained by measuring multiple downlink reference signals.

[0022] Exemplarily, the second information may be CSI reporting configuration information.

[0023] According to the above solution, the terminal device can determine the reporting parameters to be reported after measuring the downlink reference signal according to the instructions of the network side, so that the terminal device can report the parameters according to the requirements of the network side.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the second information is further used to indicate that the first downlink reference signal is a downlink reference signal used as a reference among the multiple downlink reference signals, and the at least one delay amount includes a difference between a delay estimation value obtained by measuring a reference signal other than the first downlink reference signal among the multiple downlink reference signals and a first delay estimation value, where the first delay estimation value is obtained by measuring the first downlink reference signal.

[0025] According to the above scheme, for implementation mode 2, the network side can notify the terminal device to use one downlink reference signal among multiple downlink reference signals as a reference to report the difference in delay estimation values, and the network side and the terminal device reach a consensus on the specific method of obtaining the difference in delay estimation values ​​carried in the first information.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: the terminal device receives data from the coherent joint transmission of the multiple TRPs, and the coherent joint transmission data is obtained by processing the at least one delay amount.

[0027] According to the above scheme, after the network side compensates for the phase difference that varies with different subcarriers due to different timing deviations between TRPs based on the first information reported by the terminal, it can improve the transmission performance of CJT and enhance the communication performance of the network.

[0028] In a second aspect, a signal transmission method is provided, which can be executed by a network device or a module (such as a chip or chip system) configured in (or used for) a network device. The following description takes the network device executing the method as an example.

[0029] The method includes: a network device sending a second downlink reference signal. The network device receives first information indicating at least one delay amount. One of the at least one delay amount is a difference between delay estimates of two downlink reference signals from a plurality of downlink reference signals. Alternatively, one of the at least one delay amount is a delay estimate of one downlink reference signal from a plurality of downlink reference signals, wherein the plurality of downlink reference signals includes the second downlink reference signal.

[0030] In combination with the second aspect, in some implementations of the second aspect, the method further includes: the network device determines the phase compensation amounts corresponding to the multiple downlink reference signals based on the at least one time delay amount.

[0031] In combination with the second aspect, in certain implementations of the second aspect, one of the at least one delay amounts is the difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N-1 delay amounts, where N is a positive integer; or, one of the at least one delay amount is the delay estimation value obtained by measuring one downlink reference signal among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N delay amounts.

[0032] In conjunction with the second aspect, in certain implementations of the second aspect, the first information is used to indicate at least one delay amount, including: the first information includes quantization bits for each delay amount. The quantization bits are obtained based on the delay amount and a quantization interval, where the quantization interval is indicated by a network device through signaling; or the quantization interval is determined by a terminal device, and the first information is further used to indicate the quantization interval.

[0033] In combination with the second aspect, in certain implementations of the second aspect, the first information is used to indicate at least one delay amount, including: the first information indicates the phase position corresponding to each delay amount in the at least one delay amount and the bandwidth corresponding to the phase position.

[0034] In combination with the second aspect, in certain implementations of the second aspect, one of the at least one delay amounts occupies M bits in the first information, where M is predefined or preconfigured by the network device for the terminal device through signaling.

[0035] 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 report the at least one delay amount obtained by measuring the multiple downlink reference signals.

[0036] In combination with the second aspect, in certain implementations of the second aspect, the second information is also used to indicate that the first downlink reference signal is a downlink reference signal used as a reference among the multiple downlink reference signals, and the at least one delay amount includes a difference between a delay estimation value obtained by measuring a reference signal other than the first downlink reference signal among the multiple downlink reference signals and a first delay estimation value, where the first delay estimation value is obtained by measuring the first downlink reference signal.

[0037] In combination with the second aspect, in certain implementations of the second aspect, the multiple downlink reference signals are reference signals sent by multiple TRPs.

[0038] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: the network device sends data that is coherently jointly transmitted with at least one TRP, and the coherently jointly transmitted data is obtained by processing the at least one delay amount.

[0039] In a third aspect, a signal transmission method is provided, which can be executed by a terminal device or a module (such as a chip or chip system) configured in (or used for) the terminal device. The following description takes the execution of the method by the terminal device as an example.

[0040] The method includes: a terminal device receiving multiple downlink reference signals; and a terminal device sending multiple uplink reference signals, wherein the multiple uplink reference signals correspond to the multiple downlink reference signals, and each uplink reference signal in the multiple uplink reference signals is determined based on a measurement value obtained by measuring the corresponding downlink reference signal.

[0041] In combination with the third aspect, in certain implementations of the third aspect, the terminal device receives third information, where the third information is used to indicate a correspondence between the multiple downlink reference signals and the multiple uplink reference signals.

[0042] In combination with the third aspect, in certain implementations of the third aspect, the multiple uplink reference signals correspond one-to-one to the multiple downlink reference signals.

[0043] In combination with the third aspect, in certain implementations of the third aspect, the measurement value is used for phase compensation or delay compensation of an uplink reference signal.

[0044] In a fourth aspect, a signal transmission method is provided, which can be executed by a network device or a module (such as a chip or chip system) configured in (or used for) a network device. The following description takes the execution of the method by a network device as an example.

[0045] The method includes: a network device sends a third downlink reference signal; and a network device receives a first uplink reference signal, wherein the first uplink reference signal is determined according to a measurement value of the downlink reference signal.

[0046] In conjunction with the fourth aspect, in certain implementations of the fourth aspect, the method further includes: the network device sending third information, where the third information is used to indicate a correspondence between multiple downlink reference signals and multiple uplink reference signals. One uplink reference signal in the correspondence is determined based on a measurement value obtained by measuring a corresponding downlink reference signal. The third downlink reference signal in the correspondence corresponds to the first uplink reference signal.

[0047] In combination with the fourth aspect, in certain implementations of the fourth aspect, the multiple uplink reference signals correspond one-to-one to the multiple downlink reference signals.

[0048] In conjunction with the fourth aspect, in certain implementations of the fourth aspect, the multiple uplink reference signals correspond to multiple transmission points, and the method further includes:

[0049] The network device determines a first delay difference based on a first uplink delay estimation value and a second uplink delay estimation value, where the first uplink delay estimation value is obtained based on an uplink reference signal corresponding to the first transmission point and received by the first transmission point, and the second uplink delay estimation value is obtained based on an uplink reference signal corresponding to the second transmission point and received by the second transmission point.

[0050] The network device determines a second delay difference based on a third uplink delay estimation value and a fourth uplink delay estimation value, where the third uplink delay estimation value is obtained based on an uplink reference signal corresponding to the second transmission point and received by the first transmission point, and the fourth uplink delay estimation value is obtained based on an uplink reference signal corresponding to the first transmission point and received by the second transmission point.

[0051] The network device determines a delay compensation amount for data coherently jointly transmitted by the first transmission point and the second transmission point according to the first delay difference and the second delay difference.

[0052] In combination with the fourth aspect, in certain implementations of the fourth aspect, the measurement value is used for phase compensation or delay compensation of an uplink reference signal.

[0053] In a fifth aspect, a signal transmission method is provided, which can be executed by a terminal device or a module (such as a chip or chip system) configured in (or used for) a terminal device. The following description takes the execution of the method by a terminal device as an example.

[0054] The method includes: a terminal device receives a downlink reference signal; the terminal device sends first information, the first information is used to indicate a delay estimation value, the delay estimation value is obtained by measuring the downlink reference signal

[0055] In a sixth aspect, a signal transmission method is provided, which can be executed by a network device or a module (such as a chip or chip system) configured in (or used for) a network device. The following description takes the execution of the method by a network device as an example.

[0056] The method includes: a network device sending a first downlink reference signal, and the network device obtaining a plurality of first information from a plurality of terminal devices. One first information is used to indicate a delay estimation value, and the delay estimation value is obtained by the terminal device sending the first information measuring the downlink reference signal received by the terminal device.

[0057] In combination with the sixth aspect, in certain implementations of the sixth aspect, the network device sends configuration information to each terminal device among a plurality of terminal devices, where the configuration information is used to configure the terminal device to receive a downlink reference signal.

[0058] Exemplarily, a terminal device receives a downlink reference signal sent by a TRP, and downlink reference signals received by different terminal devices among multiple terminal devices come from different TRPs.

[0059] In combination with the sixth aspect, in certain implementations of the sixth aspect, the network device determines the compensation amount of the timing deviation between multiple TRPs based on multiple first information.

[0060] In a seventh aspect, a communication device is provided. In one design, the device may include a module corresponding to each of the methods / operations / steps / actions described in the first aspect or any one of the embodiments of 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 for receiving multiple downlink reference signals; a processing unit for determining first information, where the first information is used to indicate at least one delay amount. The transceiver unit is also used to send the first information. One of the at least one delay amounts is the difference between the delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, or one of the at least one delay amount is the delay estimation value obtained by measuring one downlink reference signal among the multiple downlink reference signals.

[0061] In an eighth aspect, a communication device is provided. In one design, the device may include a module corresponding to the method / operation / step / action described in the second aspect or any one of the embodiments of the second 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 for sending a second downlink reference signal. The transceiver unit is also used to receive first information, and the first information is used to indicate at least one delay amount. A processing unit is used to determine at least one delay amount based on the first information. One of the at least one delay amount is the difference between the delay estimation values ​​of two downlink reference signals among a plurality of downlink reference signals; or one of the at least one delay amount is the delay estimation value of a downlink reference signal among a plurality of downlink reference signals; and the plurality of downlink reference signals include the second downlink reference signal.

[0062] In the ninth aspect, a communication device is provided. In one design, the device may include a module corresponding to the method / operation / step / action described in the third aspect or any one of the embodiments of 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 for receiving multiple downlink reference signals. A transceiver unit for receiving multiple downlink reference signals. The processing unit is used to determine each uplink reference signal in multiple uplink reference signals based on a measurement amount obtained by measuring the corresponding downlink reference signal. The transceiver unit is also used to send multiple uplink reference signals.

[0063] In a tenth aspect, a communication device is provided. In one design, the device may include a module corresponding to the method / operation / step / action described in the fourth aspect or any one of the embodiments of the fourth aspect. The module may be a hardware circuit, software, or a combination of a hardware circuit and software. In one design, the device includes: the processing unit is used to determine to send a third downlink reference signal, and the transceiver unit is used to send the third downlink reference signal. The transceiver unit is also used to receive a third uplink reference signal, wherein the first uplink reference signal is determined based on the measurement value of the third downlink reference signal.

[0064] In the eleventh aspect, a communication device is provided, comprising a processor. The processor can implement the method in any possible implementation of the first to sixth aspects and the first to sixth aspects. Optionally, the communication device further comprises a memory, the processor is coupled to the memory, and can be used to execute instructions in the memory to implement the method in any possible implementation of the first to sixth aspects and the first to sixth aspects. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface. In the embodiment of the present application, the communication interface can be a transceiver, a pin, a circuit, a bus, a module, or other types of communication interfaces, without limitation.

[0065] In one implementation, the communication apparatus is a communication device (such as a terminal device or an access network device). When the communication apparatus is a communication device, the communication interface may be a transceiver or an input / output interface.

[0066] In another implementation, 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.

[0067] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0068] In a twelfth aspect, a processor is provided, comprising: 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 a signal through the output circuit, so that the processor executes the method of any possible implementation of the first to sixth aspects and any possible implementation of the first to sixth aspects.

[0069] In a specific implementation, the 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 a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0070] In the thirteenth aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instructions), which, when run, enables the computer to execute the method in the above-mentioned first to sixth aspects and any possible implementation of the first to sixth aspects.

[0071] In the fourteenth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions) which, when run on a computer, enables the computer to execute the method in the above-mentioned first to sixth aspects and any possible implementation of the first to sixth aspects.

[0072] In a fifteenth aspect, a communication system is provided, comprising at least one terminal device and at least one network device as mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] FIG1 is a schematic diagram of a communication system applicable to an embodiment of the present application;

[0074] FIG2 is another schematic diagram of a communication system applicable to an embodiment of the present application;

[0075] FIG3 is a schematic diagram of signal delay when multiple TRPs provide CJT services to terminal devices according to an embodiment of the present application;

[0076] FIG4 is a schematic flow chart of a signal transmission method provided in an embodiment of the present application;

[0077] FIG5 is a schematic diagram of the time domain characteristics of a channel provided in an embodiment of the present application;

[0078] FIG6 is another schematic flowchart of the signal transmission method provided in an embodiment of the present application;

[0079] FIG7 is a schematic block diagram of a communication device provided in an embodiment of the present application;

[0080] FIG8 is another schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0081] The technical solution in this application will be described below with reference to the accompanying drawings.

[0082] In the embodiments of this application, " / " can indicate that the objects associated with each other are in an "or" relationship. For example, A / B can mean A or B. "And / or" can be used to describe the existence of three relationships between the associated objects. For example, "A and / or B" can mean: A exists alone, A and B exists simultaneously, and B exists alone. A and B can be singular or plural. To facilitate the description of the technical solutions of the embodiments of this application, the words "first" and "second" can be used to distinguish them in the embodiments of this application. The words "first" and "second" do not limit the quantity or order of execution, and the words "first" and "second" do not necessarily mean different. In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete way to facilitate understanding. In the embodiments of the present application, at least one (kind) can also be described as one (kind) or multiple (kinds), and multiple (kinds) can be two (kinds), three (kinds), four (kinds) or more (kinds), and this application does not limit it.

[0083] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as long-term evolution (LTE) systems, fifth-generation (5G) communication systems, and wireless fidelity (WiFi) systems. The communication method provided in this application can also be applied to sixth-generation (6G) communication systems and other communication systems evolved after 5G, future communication systems, or other communication systems. This application is not limited to this.

[0084] Figure 1 is a schematic diagram illustrating a possible, non-limiting system. As shown in Figure 1 , communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. RAN 100 includes at least one RAN node (e.g., 110a and 110b in Figure 1 , collectively referred to as 110) and at least one terminal (e.g., 120a-120j in Figure 1 , collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment (not shown in Figure 1 ). Terminal 120 is wirelessly connected to RAN node 110. Access network node (or RAN node) 110 is wirelessly or wiredly connected to core network 200. The core network equipment in core network 200 and access network node 110 in RAN 100 can be separate physical devices, or they can be a single physical device that integrates core network logical functions and radio access network logical functions.

[0085] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or a future-oriented evolutionary system (such as a 6G mobile communication system). The RAN 100 may also be an open 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.

[0086] Access network node 110, sometimes also referred to as access network equipment, RAN entity, or access node, constitutes part of the communication system and facilitates wireless access for terminals. 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 access network node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminal 120j accessing RAN 100 via network element 120i, network element 120i is a base station; however, for base station 110a, network element 120i is a terminal. Access network node 110 and terminal 120 are sometimes referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functionality, and network elements 120a-120j can be understood as communication devices with terminal functionality.

[0087] In one possible scenario, the access network node may 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 sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. The access network node may be a macro base station (such as 110a in FIG1 ), a micro base station or an indoor station (such as 110b in FIG1 ), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, the access network node may also be a server, a wearable device, a vehicle or an onboard device, etc. For example, the access network device in the vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the access network node in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The access network node in this application may also be a logical node, a logical module or software that can implement all or part of the access network node functions.

[0088] In another possible scenario, multiple access network nodes collaborate to assist the terminal in achieving wireless access, and different access network nodes respectively implement part of the functions of the base station. For example, the access network node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0089] A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, or mobile terminal. A terminal can be widely used in various communication scenarios. These scenarios include, but are not limited to, at least one of the following: 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, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, sensing terminals, integrated communication and sensing terminals, or smart cities. The terminal can be a mobile phone (such as 120a, 120j and 120e in Figure 1), a tablet computer, a computer with wireless transceiver function (such as 120g in Figure 1), customer-premises equipment (CPE), a smart point of sale (POS) machine, a wearable device, a vehicle (such as 120b in Figure 1), a drone, a helicopter, an airplane (such as 120i in Figure 1), a ship, a robot, a robotic arm, a sensor, a perception device, or a smart home device (such as 120h in Figure 1), etc.

[0090] FIG2 is another system diagram applicable to an embodiment of the present application. The system may include multiple transmission points, such as transmission point 211, transmission point 212, and transmission point 213 shown in FIG2. The transmission points may be transmission and reception points (TRPs) with information sending and receiving functions. The system may also include at least one terminal device, such as terminal device 220 shown in FIG2. The multiple TRPs shown in FIG2 can communicate with the terminal device 220 in a manner of multiple transmission point collaboration. For example, the multiple TRPs can communicate with the terminal device in a coherent joint transmission (CJT) manner. The multiple TRPs transmit the same data stream to the terminal device in a joint transmission manner, achieving coherent superposition of signals at the terminal device and coherent cancellation of interference, greatly improving the terminal device's received signal to interference and noise ratio (SINR), and thereby improving the data transmission rate between the network device and the terminal device.

[0091] In the embodiments of the present application, the TRP may be an access network node, such as a network device (such as an access network device), or the TRP may be configured in a network device, such as a baseband unit (BBU), a remote radio unit (RRU), or a distributed unit (DU) of a network device. 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 in the present application can be interchangeable.

[0092] The operations performed by the network side described in the embodiments of this application may be performed by a TRP on the network side, which may be the TRP of the CJT participating in the terminal device. Alternatively, different operations performed by the network side may be performed by different devices on the network side, such as different operations may be performed by a CU and a DU respectively, and this application does not limit this.

[0093] The following first analyzes the impact of inter-TRP timing deviation caused by non-ideal clock synchronization on CJT performance. As shown in Figure 3, the terminal device is jointly transmitted by two TRPs, namely TRP1 and TRP2. The downlink transmission from TRP1 to the terminal device will experience the transmission channel delay τ of TRP1. Tx1 , the timing deviation τ of TRP1 introduced by the non-ideal clock clock1 , and the air interface transmission delay τ from TRP1 to the terminal device OTA1 For the uplink transmission from the terminal device to TRP1, the air interface transmission delay from the terminal device to TRP1 is equal to the downlink transmission from TRP1 to the terminal device, both of which are τ OTA1 , the receiving channel delay τ of TRP1 Rx1 , and the timing deviation introduced by the non-ideal clock is -τ clock1 Among them, the delay of the receiving and sending channels is determined by the hardware characteristics of the receiving and sending channels, and changes slowly over time, while the timing deviation will continue to accumulate with the deviation of the clock frequency. Similarly, the transmission between TRP2 and the terminal device also includes the sending channel delay and the receiving channel delay, which are τ respectively. Tx2 , τ Tx1 , the air interface delay is τ OTA2 , and the uplink and downlink timing deviation τ of TRP2 introduced by the non-ideal clock clock2 and -τ clock2 .

[0094] The above air interface delay, channel delay and timing deviation can all be modeled as the delay introduced by the signal sent by TRP to the terminal device in the time domain. Specifically, for a signal x(t), after the delay τ is introduced, the signal can be expressed as x(t-τ) in the time domain and transformed into the frequency domain, it can be expressed as where f SC represents the subcarrier frequency interval, and k represents the subcarrier number. The air interface channel response from TRP i to the terminal device on subcarrier k is H i (k), when there is a delay τ between TRP i and the terminal device i When TRP i sends signal x i (t), after the terminal device receives the signal, the received signal on subcarrier k can be expressed in the frequency domain as It can be seen from this that the delay τ i The existence of is equivalent to an additional phase being introduced into the channel on subcarrier k, and the equivalent channel response can be expressed as The size of the phase rotation is related to the subcarrier identifier k, and the delay τ i Different phase rotations are introduced on different subcarriers k, making the channel more frequency selective.

[0095] According to the above analysis, any delay difference from different TRP to terminal equipment (including different timing deviations, i.e., τ clock1 -τ clock2 ≠0), the phase difference of the transmitted signals of different TRPs will be introduced, which varies with the subcarrier. For example, if the subcarrier spacing is 30kHz, the timing deviation between TRP1 and TRP2 is τ clock1 -τ clock2 =130ns, for subcarrier 1, its frequency is f SC1 =30kHz, the phase difference between TRP is 2π×f SC1 ×(τ clock1 -τ clock2 )=1.4°. For subcarrier 24, its frequency is f SC24 =24×30kHz, the phase difference between TRPs is 2π×f SC24 ×(τ clock1 -τ clock2 )=33.7°. For subcarrier 48, its frequency is f SC48 =48×30kHz, the phase difference between TRPs is 2π×f SC48 ×(τ clock1 -τ clock2 )=67.5°.

[0096] Since each resource block (RB) contains 12 subcarriers, the above three subcarriers are located in the frequency range corresponding to the four RBs, that is, the frequency range corresponding to subcarrier 1 to subcarrier 48 belongs to the four RBs. It can be seen that the phase difference between TRPs on different subcarriers of the above four RBs varies greatly. However, the precoding of the signal is usually based on the granularity of the RB group (RBG), and each RBG usually contains 4 RBs (or 48 resource elements (REs)), where one RE corresponds to one subcarrier in the frequency domain, and all REs in each RBG share the same precoding. At this time, the phase difference between TRPs on different subcarriers is different, and the precoding of the RBG granularity cannot guarantee that the signal can be coherently superimposed in each RE. Therefore, it is necessary to timely estimate the timing deviation between TRPs in order to compensate for the phase difference between TRPs on each subcarrier to ensure the coherent superposition effect.

[0097] To address the above problems, this application proposes that relevant parameters can be measured and reported by the terminal device to assist the network side in estimating and compensating for the phase difference that varies with different subcarriers due to different timing deviations between TRPs, thereby improving the CJT transmission performance.

[0098] FIG4 is a schematic flow chart of a signal transmission method 400 provided in an embodiment of the present application. The method may include but is not limited to the following S401 and S402.

[0099] S401, the terminal device receives multiple downlink reference signals.

[0100] The multiple downlink reference signals may be downlink reference signals sent by multiple reference signal ports on a downlink reference signal resource. Alternatively, the multiple downlink reference signals may be downlink reference signals respectively carried on multiple downlink reference signal resources. This application does not limit this.

[0101] Exemplarily, the downlink reference signal may be a channel state information-reference signal (CSI-RS). Accordingly, the downlink reference signal resource used to carry the downlink reference signal may be a CSI-RS resource.

[0102] The terminal device can receive the multiple downlink reference signals according to the configuration of the network side. The multiple reference signals can come from multiple TRPs, which are multiple TRPs that use (or need to use) CJT to transmit data to the terminal device.

[0103] The multiple downlink reference signals may be two downlink reference signals, which are reference signals sent by two TRPs respectively, or the multiple downlink reference signals may include more than two downlink reference signals, which are sent by different TRPs respectively.

[0104] For example, the terminal device receives reference signal resource configuration information from the network side (e.g., from one of the multiple TRPs described above), and the reference signal resource configuration information is used to configure the terminal device to receive the multiple downlink reference signals. The reference signal resource configuration information may specifically configure the sequence, time-frequency resources, etc. of each downlink reference signal in the multiple downlink reference signals. The terminal device may receive the multiple downlink reference signals according to the reference signal resource configuration information.

[0105] Exemplarily, the reference signal resource configuration information may be CSI-RS resource configuration information. The reference signal resource configuration information may be carried in a radio resource control (RRC) message.

[0106] It should be noted that the terminal device can only receive the multiple downlink reference signals and feed back corresponding parameters according to the configuration on the network side, and the terminal device does not need to know which TRP each reference signal comes from.

[0107] S402, the terminal device sends first information, where the first information is used to indicate at least one delay amount, and the at least one delay amount is obtained by measuring the multiple downlink reference signals.

[0108] The following description uses the first TRP and the second TRP as an example to illustrate CJT transmission for the terminal device. At this time, the first TRP and the second TRP each send a downlink reference signal, wherein the first TRP sends the first downlink reference signal and the second TRP sends the second downlink reference signal. It should be understood that, in a specific implementation, the terminal device can also be CJT-transmitted by more than two TRPs. At this time, each TRP sends a downlink reference signal, and accordingly, the terminal device receives downlink reference signals from the more than two TRPs. The specific scenario of more than two TRPs can be implemented with reference to the introduction of the first TRP and the second TRP below, which will not be repeated here.

[0109] The first TRP sends the first downlink reference signal, and the corresponding received signal of the terminal device can be expressed as:

[0110] in, is the equivalent channel response between the first TRP and the terminal device on subband k, where k is a subband identifier. For example, the subband may be RE. Specifically, each RB may have some or all REs used to carry downlink reference signals. 1,k is the first downlink reference signal on subband k, h 1,k is the air interface channel response between the first TRP and the terminal device, τ OTA1 is the air interface transmission delay between the first TRP and the terminal device, τ Tx1 is the transmission channel delay of the first TRP, τ clock1 is the timing deviation of the first TRP due to the non-ideal clock.

[0111] The second TRP sends the second downlink reference signal, and the corresponding received signal of the terminal device can be expressed as:

[0112] in, is the equivalent channel response between the second TRP and the terminal device on subband k, s 2,k is the second downlink reference signal on subband k, h 2,k is the air interface channel response between the second TRP and the terminal device, τ OTA2 is the air interface transmission delay between the second TRP and the terminal device, τ Tx2 is the transmission channel delay of the second TRP, τ clock2 is the timing deviation of the second TRP due to the non-ideal clock.

[0113] After receiving multiple downlink reference signals, the terminal device can measure each downlink reference signal and estimate the corresponding delay, such as estimating the first path delay or the strongest path delay. Taking the case where the terminal device estimates the first path delay based on the first downlink reference signal sent by the first TRP as an example, a specific estimation method is introduced. The method may include but is not limited to the following steps:

[0114] 1. The terminal device estimates the channel response on all subbands carrying the first downlink reference signal by the least square (LS) method. Taking the channel estimation on subband k as an example, the channel response The estimated value of can be expressed as:

[0115] 2. The terminal device arranges the channel responses on different sub-bands estimated in step 1 in order from low to high frequency to obtain the sequence Where K represents the total number of subbands for transmitting the first downlink reference signal, and a zero padding operation is performed at the end of the above sequence to fill in a total of N fft Point, get the sequence Usually take Nfft =2 P , where P is a positive integer, where N fft It can be predefined or can be indicated by the network side. The network side can directly indicate N fft Or you can indicate N by indicating P fft Optionally, multiple candidate values ​​of P can be predefined, and the network side indicates one of the P values ​​so that the terminal device can determine N. fft .

[0116] 3. The number of points of the zero-filled sequence obtained in step 2 is N fft The inverse fast Fourier transform (IFFT) is used to convert the estimated value of the frequency domain channel response to the time domain to obtain the time domain characteristics of the channel, which have different energies at different time domain sampling points. Figure 5 is a schematic diagram of the time domain characteristics of the channel;

[0117] 4. The terminal device can determine the location of the sampling point with the strongest energy in the time domain. The sampling point with the strongest energy corresponds to the sequence number I. max ∈ {0,1,…,N fft -1}, according to I max The delay estimation value corresponding to the strongest path can be obtained; further, the terminal device can set a certain threshold value and find a sampling point before the sampling point with the strongest energy whose energy difference with the strongest sampling point is not greater than the threshold value, and record the number of this sampling point as I first , according to I first The delay estimation value corresponding to the first path can be obtained.

[0118] In the above delay estimation method, the delay estimation value τ corresponding to the sequence number I of the time domain sampling point can be expressed as:

[0119] Among them, the value of I can be I max or I first , or other serial numbers, the value of I can be determined based on the delay estimation value corresponding to which path is used as the delay estimation value obtained by measuring the reference signal in the specific implementation. ref represents the frequency interval between two adjacent subbands carrying the first downlink reference signal, Δf ref It is an integer multiple of the subcarrier spacing. For example, the downlink reference signal is placed in an RE of each RB at equal intervals. Δf ref The subcarrier spacing is 12 times.

[0120] According to the above delay estimation method, the terminal device can obtain the first delay estimation value τ by measuring the first downlink reference signal DL1 , the first delay estimate τ DL1Including air interface transmission delay τ OTA1 , the first TRP transmission channel delay τ Tx1 Timing deviation τ from the first TRP clock1 , that is: τ DL1 =τ OTA1 +τ Tx1 +τ clock1 ,

[0121] Similarly, according to the above delay estimation method, the terminal device can obtain the second delay estimation value τ by measuring the second downlink reference signal. DL2 , the second delay estimate τ DL2 Including air interface transmission delay τ OTA2 , the second TRP transmission channel delay τ Tx2 and the timing deviation τ of the second TRP clock2 , that is: τ DL2 =τ OTA2 +τ Tx2 +τ clock2 .

[0122] In the first embodiment, the first information sent by the terminal device in S402 indicates at least one delay amount. The at least one delay amount may include a delay estimate value obtained by the terminal device measuring a downlink reference signal, that is, the delay amount is a delay estimate value. One of the at least one delay amount is a delay estimate value obtained by measuring one downlink reference signal among multiple downlink reference signals.

[0123] For example, the first information indicates the first delay estimation value τ obtained by the terminal device measuring the first downlink reference signal DL1 and the second delay estimation value τ obtained by measuring the second downlink reference signal DL2 If the number of downlink reference signals included in the multiple downlink reference signals received by the terminal device in S401 is N, such as N ≥ 2, then the at least one delay amount indicated by the first information includes N delay estimation values. That is, the delay amount indicated by the first information includes the delay estimation value obtained by the terminal device measuring each downlink reference signal in the N downlink reference signals.

[0124] In the second embodiment, the first information sent by the terminal device in S402 indicates at least one delay amount, and the at least one delay amount may include at least one delay estimation value difference, that is, the delay amount is a delay estimation value difference. Each delay estimation difference is a difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals.

[0125] For example, the first information indicates the difference Δτ of the delay estimation value DL21 , the difference Δτ DL21is the second delay estimation value τ obtained by the terminal device measuring the second downlink reference signal DL2 and the first delay estimation value τ obtained by measuring the first downlink reference signal DL1 The difference between the two is denoted as Δτ DL21 , Δτ DL21 =τ DL2 -τ DL1 .

[0126] Optionally, the difference of at least one delay estimation value indicated by the first information includes the difference between the first delay estimation value and the delay estimation value obtained by measuring each downlink reference signal other than the first downlink reference signal in multiple downlink reference signals, and the first delay estimation value is obtained by measuring the first downlink reference signal.

[0127] If the number N of downlink reference signals received by the terminal device is greater than 2, such as N is 3, 4, ..., etc., the network side (such as a TRP in a plurality of TRPs) can indicate to the terminal device through an indication message that one of the multiple downlink reference signals is used as a reference, such as the indication message may include a resource identifier of the reference signal used as a reference, and the indication message may include a resource identifier of the first downlink reference signal. After receiving the indication message, the terminal device determines that the first downlink reference signal is the downlink reference signal used as a reference among the multiple downlink reference signals. The terminal device uses the first delay estimation value obtained by measuring the first downlink reference signal as a reference delay estimation value, and determines the difference between the first delay estimation value and the delay estimation values ​​obtained by measuring other downlink reference signals. Exemplarily, the indication information can be carried in the reporting configuration information (i.e., the second information) introduced below.

[0128] For example, the downlink reference signal received by the terminal device also includes a third downlink reference signal, and the delay estimation value obtained by the terminal device measuring the third downlink reference signal is τ DL3 , the terminal device can determine the delay estimation value τ obtained by measuring the first downlink reference signal according to the network side configuration DL1 As a reference, the terminal device can determine the delay estimate τ DL3 and the delay estimate τ DL1 The difference Δτ between DL31 , that is, Δτ DL31 =τ DL3 -τ DL1 The difference of at least one time delay estimation value indicated by the first information also includes the difference Δτ of the time delay estimation value. DL31 If the terminal device receives a downlink reference signal in S401, the first information indicates the difference of N-1 transmission delays.

[0129] The terminal device can obtain the second information sent down by the network side, and the second information can be so-called reporting configuration information. For example, the reporting configuration information can be CSI reporting configuration information, and the reporting configuration information can be carried in the RRC message. For example, the reporting configuration information can configure reporting parameters, reference signal resource configuration associated with the reporting, etc. The terminal device can report the delay amount to the network side based on the multiple downlink reference signals received according to the reporting configuration information, so that the network side can determine the compensation amount for compensating for the phase difference that varies with the subcarrier and is caused by different timing deviations between TRPs according to the delay amount reported by the terminal device. If the reporting configuration information can indicate the reporting parameter reported by the terminal device, and if the reporting configuration information can indicate that the reporting parameter reported by the terminal device is a delay estimation value (i.e., the above-mentioned embodiment one), the terminal device can report the delay estimation value obtained by measuring each downlink reference signal in the multiple downlink reference signals through the first information according to the reporting configuration information. Alternatively, the reporting configuration information may indicate that the reporting parameter reported by the terminal device is the difference in delay estimation values ​​(i.e., the above-mentioned embodiment 2), and instruct the terminal device to use the first downlink reference signal as a reference. The terminal device may then measure each downlink reference signal in multiple uplink reference signals according to the reporting configuration information to obtain multiple delay estimation values, and use the first delay estimation value as a reference to determine the difference between other delay estimation values ​​and the first delay estimation value. The terminal device reports the difference in delay estimation values ​​determined by it through the first information.

[0130] The specific manner in which the first information indicates the delay amount is exemplarily described below.

[0131] In the first information, a delay amount occupies M bits, where M is a positive integer. M can be predefined or preconfigured by the network device for the terminal device through signaling (such as through the reported configuration information described above). After determining a delay amount, the terminal device quantizes the delay amount to obtain M quantized bits of the delay amount.

[0132] In Example 1, the terminal device quantizes the delay amount using uniform quantization. The first information can indicate the number of time units contained in each delay amount in at least one delay amount. The time unit is predefined or preconfigured for the terminal device by the network device through signaling.

[0133] For example, the terminal device uses uniform quantization to quantize the delay amount, that is, the terminal device uses equal quantization intervals to quantize the delay amount, and the quantization interval is the quantization time unit. The M quantization bits of a delay amount in the first information may include a bit for indicating that the delay amount is a positive or negative value, and the quantization bit also includes a binary representation of a first number, which is the number of quantization intervals contained in the delay amount.

[0134] After the terminal device measures the delay, it can use a certain quantization interval Δτ to calculate the delay. u The delay amount is quantized by the number of quantization bits, and the quantization bits may further include 1 bit for indicating whether the delay amount is a positive value or a negative value. For example, the highest bit of the quantization bit is used to indicate whether the delay amount is a positive / negative value, and the subsequent M-1 bits are used to indicate the binary representation of the first quantity. The first delay estimate value τ DL1 Taking the quantization of as an example, the terminal device may determine the first quantity Q as follows:

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

[0136] For example, the number of quantization bits of the first delay estimation value is M=4, where the first bit is used to indicate τ DL1 It is a positive or negative value. If the bit is 1, it indicates a positive value, and 0 indicates a negative value. If the first delay estimate is a positive value, the first bit of the quantization bit is 1. The subsequent 3 bits of the quantization bit are the binary representation of Q. For example, if Q = 6, the binary representation of Q is 110. Therefore, the first delay estimate τ in the first information is DL1 The four quantization bits of the first delay estimation value and the Q quantization interval Δτ are 1110. After receiving the first information, the network side can u , we get τ DL1 .

[0137] For another example, the terminal device may also quantize the delay amount in a non-uniform quantization manner, that is, the quantization intervals used in the quantization are not equal.

[0138] Example 2: The terminal device can report the delay based on the sequence number of the time domain sampling point.

[0139] In the first embodiment described above, the delay amount indicated by the first information is a delay estimate value obtained by measuring a downlink reference signal. The first information may indicate the delay estimate value by indicating the sequence number of the time domain sampling point corresponding to the delay estimate value. That is, the first information implicitly indicates the delay estimate value through the sequence number of the time domain sampling point.

[0140] For example, with the first delay estimate τ DL1 For example, the first delay estimation value τ DL1 The serial number of the corresponding time domain sampling point is I DL1 , I DL1 ∈{0,1,...,N fft The M bits used to indicate the first delay estimation value in the first information are the sequence number I of the time domain sampling point. DL1 The binary representation of N fft =2P , M=P. After the network side obtains the first information, it can DL1 The expression of the delay estimation value τ corresponding to the time domain sampling point number I introduced above is used to determine the first delay estimation value τ DL1 Other delay estimation values ​​indicated by the first information may be implemented with reference to the indication method of the first delay estimation value, which will not be described in detail here.

[0141] For the above-mentioned second embodiment, the delay amount indicated by the first information is the difference in the delay estimation values. The first information can implicitly indicate the difference in the delay estimation values ​​by indicating the difference in the sequence numbers of the two time domain sampling points corresponding to the difference in the delay estimation values.

[0142] For example, with the second delay estimate τ DL2 and the first delay estimate τ DL1 The difference Δτ DL21 For example, the first delay estimate τ DL1 The serial number of the corresponding time domain sampling point is I DL1 , the second delay estimate τ DL2 The serial number of the corresponding time domain sampling point is I DL2 , where I DL1 , I DL2 ∈{0,1,...,N fft -1}. The terminal device can determine the difference Δτ in the delay estimate DL21 The difference between the serial numbers of the two corresponding time domain sampling points is I DL21 =I DL2 -I DL1 The M bits used to indicate the first delay estimation value in the first information include bits used to indicate I DL21 1 bit for positive or negative value, and the M bits also include the difference I of the sequence number DL21 The binary representation of M = 1 + P. After the network side obtains the first information, it can use the difference I of the sequence number to DL21 The expression of the delay estimate τ corresponding to the time domain sampling point number I introduced above (since the sequence number I and the delay estimate τ are in a linear relationship in the expression, the difference between the two parameters still satisfies the linear relationship) is used to determine the difference τ in the delay estimate. DL1 If the terminal device also needs to report the difference of other delay estimation values, the difference of other delay estimation values ​​indicated by the first information can refer to the difference τ of the delay estimation value. DL21 The instructions are implemented and will not be described in detail here.

[0143] In Example 3, the first information includes an identifier of a phase position corresponding to each delay amount and a bandwidth corresponding to the phase position.

[0144] That is, the first information may implicitly indicate each time delay by indicating an identifier of a phase gear corresponding to each time delay and a bandwidth corresponding to the corresponding gear.

[0145] For example, the delay measured by the terminal device is 200ns. This delay can be the delay estimate in the above-mentioned embodiment 1, or can be the difference between the delay estimates in the above-mentioned embodiment 2. Multiple candidate phase positions and corresponding identifiers can be predefined. For example, multiple candidate phase positions can include π / 4, π / 2, and π, and the corresponding identifiers are 0, 1, and 2 respectively. The terminal device can determine a phase position, such as π / 2, from multiple phase change amounts based on the delay, such as the subcarrier spacing f. SC =30kHz, the terminal equipment can be based on the relationship between delay, bandwidth and phase 2π·Kf SC τ = π / 2, determine the bandwidth Kf corresponding to the phase position π / 2 SC Specifically, the terminal device can determine the bandwidth Kf SC The number of subcarriers included is K=41.66, that is, when the delay is 200ns, the phase difference changes by π / 2 after the bandwidth of 41.66 subcarriers. The first information sent by the terminal device may include an identifier of the phase position π / 2, that is, identifier 1, and an indication of the number of subcarriers K included in the bandwidth. The first information indicates the number of subcarriers K in a manner such that the first information includes a binary representation of the number of subcarriers K rounded down, or the first information includes a quantization bit of the number of subcarriers K, which is obtained based on the quantization interval of the number of subcarriers K. For the specific quantization method, reference may be made to the quantization method of the delay introduced above, which will not be repeated here.

[0146] The above describes that a terminal device can select a phase position from multiple candidate phase positions, but the present application is not limited to this. In another embodiment, a phase position can be predefined or preconfigured by the network side through signaling (such as preconfigured through CSI reporting measurement information). The terminal device can determine the number of subcarriers included in the bandwidth corresponding to the phase position based on the delay amount and the phase position, and the first information sent by the terminal device includes the number of subcarriers.

[0147] The network side (such as one or more TRPs among multiple TRPs) can receive the first information, and according to at least one delay amount indicated by the first information, the phase compensation amount on each subcarrier can be determined. The specific compensation method for the phase difference can be that the multiple TRPs perform phase compensation separately, or some of the multiple TRPs perform phase compensation of the signal. For example, when two TRPs participate in CJT, the two TRPs can perform phase compensation of the signal based on the first information respectively, or one of the TRPs can perform phase compensation of the signal based on the first information. This application does not limit this. If the first information indicates that the difference between the first delay estimate and the second delay estimate is Δτ DL21 , the phase compensation amount on subcarrier k can be determined to be 2π·kf SC ·Δτ DL21 , the first TRP compensates for the phase difference between the first and second TRPs due to different timing offsets, thereby compensating for the phase difference that varies with different subcarriers. By compensating for the phase difference on different subcarriers, the transmission performance of multiple TRPs using CJT to transmit data to terminal devices can be improved.

[0148] The embodiment shown in FIG4 above introduces a method in which the terminal device reports the delay amount to the network side after measuring multiple downlink reference signals, and assists the network side in compensating for the phase difference that varies with different subcarriers due to different timing deviations between TRPs. The following introduces another method provided by the present application in which the terminal device assists the network side in compensating for the phase difference that varies with different subcarriers due to different timing deviations between TRPs. In this method, after receiving multiple downlink reference signals, the terminal device determines the pre-compensation amount of multiple uplink reference signals based on the measured delay amount, and then the terminal device sends the multiple uplink reference signals compensated by the pre-compensation amount, so that the network side can obtain the estimated value of the timing deviation between multiple TRPs based on the received uplink reference signal, thereby determining the phase compensation amount on each subcarrier. This method can reduce the reporting overhead of the terminal device and improve the accuracy of the phase compensation amount obtained by the network side.

[0149] FIG6 is a schematic flow chart of a signal transmission method 600 provided in an embodiment of the present application. The method may include, but is not limited to, the following steps S601 and S602. It should be understood that for the same content as that in the embodiment shown in FIG6 , reference can be made to the description of the embodiment shown in FIG4 above, and no further details will be given here.

[0150] S601, the terminal device receives multiple downlink reference signals.

[0151] After receiving multiple downlink reference signals, the terminal device can measure the delay estimation value obtained by each downlink reference signal. If the multiple downlink reference signals include a first downlink reference signal and a second downlink reference signal, the terminal device can measure the first downlink reference signal to obtain the delay estimation value τ DL1 , where τ DL1 Including air interface transmission delay τ OTA1 , the first TRP transmission channel delay τ Tx1 and the timing deviation τ of the first TRP introduced by the non-ideal clock clock1 , that is: τ DL1 =τ OTA1 +τ Tx1 +τ clock1 ,

[0152] The terminal device can measure the second downlink reference signal to obtain the transmission delay τ DL2 , where τ DL2 Including air interface transmission delay τ OTA2 , the second TRP transmission channel delay τ Tx2 and the timing deviation τ of the second TRP introduced by the non-ideal clock clock2 , that is: τ DL2 =τ OTA2 +τ Tx2 +τ clock2 .

[0153] S602, the terminal device sends multiple uplink reference signals, wherein the multiple uplink reference signals correspond to the multiple downlink reference signals, and each uplink reference signal in the multiple uplink reference signals is determined according to a measurement value obtained by measuring the corresponding downlink reference signal.

[0154] Exemplarily, the uplink reference signal may be a sounding reference signal (SRS), or may be other uplink reference signals.

[0155] The multiple uplink reference signals may be multiple uplink reference signals sent through multiple reference signal ports on an uplink reference signal resource. Alternatively, the multiple uplink reference signals may be multiple uplink reference signals sent respectively on multiple uplink reference signal resources. This application does not limit this. For example, the uplink reference signal resource may be an SRS resource.

[0156] The terminal device may obtain third information from the network side (e.g., from the first TRP or the second TRP), where the third information is used to indicate the correspondence between the multiple uplink reference signals and the multiple downlink reference signals. The terminal device determines the correspondence between the multiple uplink reference signals and the multiple downlink reference signals based on the third information.

[0157] The multiple uplink reference signals correspond one-to-one with the multiple downlink reference signals sent in S602. For example, in this correspondence, the first downlink reference signal corresponds to the first uplink reference signal, and the second downlink reference signal corresponds to the second uplink reference signal. Each uplink reference signal in the multiple uplink reference signals is determined based on a measurement value obtained by measuring the corresponding downlink reference signal.

[0158] In one example, the reference signal resource configuration information of the downlink reference signal includes resource indication information of each downlink reference signal (i.e., an example of the third information), and the resource indication information is used to indicate the resource identifier of each downlink reference signal. And the resource indication information may also include the resource identifier of the uplink reference signal corresponding to the downlink reference signal. The terminal device can determine the correspondence between the downlink reference signal and the uplink reference signal based on the resource indication information of the downlink reference signal. For example, the resource indication information of the first downlink reference signal includes the resource identifier of the first uplink reference signal. The resource indication information of the second downlink reference signal includes the resource identifier of the second uplink reference signal.

[0159] In another example, the reference signal resource configuration information of the uplink reference signal includes resource indication information of each uplink reference signal (i.e., another example of the third information), and the resource indication information is used to indicate the resource identifier of each uplink reference signal. And the resource indication information may also include the resource identifier of the downlink reference signal corresponding to the uplink reference signal. The terminal device can determine the correspondence between the uplink reference signal and the downlink reference signal based on the resource indication information of the uplink reference signal. For example, the resource indication information of the first uplink reference signal includes the resource identifier of the first downlink reference signal. The resource indication information of the second uplink reference signal includes the resource identifier of the second downlink reference signal.

[0160] Specifically, the terminal device can determine the first uplink reference signal based on the measurement amount of the first downlink reference signal according to the corresponding relationship, and the measurement amount is the transmission delay τ obtained by the terminal device measuring the downlink reference signal. DL1 The terminal device can obtain the delay estimation value τ based on the measurement of the first downlink reference signal. DL1 , determine the pre-compensation amount of the first uplink reference signal on subband k Should It can be expressed as:

[0161] The terminal device uses the pre-compensation amount to compensate the uplink reference signal s carried by subband k. UL1,k Frequency domain precompensation can be performed to obtain the first uplink reference signal s′ carried by subband k UL1,k , that is, the first uplink reference signal s′ UL1,k Based on the pre-compensation For uplink reference signal s UL1,k The uplink reference signal obtained by pre-compensation. s′ UL1,k It can be expressed as:

[0162] The multiple uplink reference signals sent by the terminal device include the first uplink reference signal. Accordingly, the multiple TRPs participating in the CJT receive the first uplink reference signal from the terminal device. For the first uplink reference signal, the corresponding received signal of the first TRP on subband k can be expressed as:

[0163] The definition of each parameter in the expression in the embodiment shown in FIG6 can refer to the description in the embodiment shown in FIG4, and will not be repeated here. The first TRP can measure the received signal corresponding to the first uplink reference signal to obtain the uplink delay estimation value τ UL11 The pre-compensation of the first uplink reference signal in the frequency domain, the various delays introduced by the uplink transmission from the terminal device to the first TRP, and the uplink delay estimation value τ measured in the delay domain UL11 It can be expressed as τ UL11 =2τ OTA1 +τ Tx1 +τ Rx1 .

[0164] For the first uplink reference signal, the received signal corresponding to the second TRP on subband k can be expressed as:

[0165] The second TRP can measure the received signal corresponding to the first uplink reference signal to obtain the uplink delay estimation value τ UL21 =(τ OTA1 +τ oTA2 )+(τ Tx2 +τ Rx1 +τ clock2 -τ clock1 ).

[0166] Similarly, the terminal device can obtain the delay τ based on the measurement of the second downlink reference signal according to the corresponding relationship of the reference signal. DL2 Determine the second uplink reference signal. The terminal device can determine the pre-compensation amount of the second uplink reference signal on subband k Should It can be expressed as:

[0167] The terminal device uses the pre-compensation amount to compensate the uplink reference signal s carried by subband k. UL2,k Perform frequency domain precompensation to obtain the second uplink reference signal s′ carried by subband k UL2,k , that is, the second uplink reference signal s′UL2,k Based on the pre-compensation For uplink reference signal s UL2,k The uplink reference signal obtained by pre-compensation. s′ UL2,k It can be expressed as:

[0168] The multiple uplink reference signals sent by the terminal device include the second uplink reference signal, and the multiple TRPs providing CJT services for the terminal device receive the second uplink reference signal from the terminal device. Wherein, for the second uplink reference signal, the received signal of the second TRP on subband k can be expressed as:

[0169] The definition of each parameter in the expression in the embodiment shown in FIG6 can refer to the description in the embodiment shown in FIG4, and will not be repeated here. The second TRP can measure the received signal corresponding to the second uplink reference signal to obtain the uplink delay estimation value τ UL22 The pre-compensation of the second uplink reference signal in the frequency domain, combined with the various delays introduced by the uplink transmission from the terminal device to the second TRP, results in an estimated uplink delay value τ measured in the delay domain. UL22 It can be expressed as τ UL22 =2τ OTA2 +τ Tx2 +τ Rx2 .

[0170] For the second uplink reference signal, the received signal of the first TRP on subband k can be expressed as:

[0171] The first TRP can measure the received signal corresponding to the second uplink reference signal to obtain an uplink delay estimation value τ UL12 =(τ OTA1 +τ OTA2 )+(τ Tx1 +τ Rx2 +τ clock1 -τ clock2 ).

[0172] The above uses two TRPs (i.e., the first TRP and the second TRP) to illustrate CJT transmission for the terminal device. If the number of TRPs for CJT transmission for the terminal device exceeds two, a similar method can be used to obtain the corresponding uplink delay estimation value based on measuring the pre-compensated uplink reference signal, which will not be repeated here.

[0173] The network side (such as the first TRP and / or the second TRP) can estimate the uplink delay value τ UL22 and the estimated uplink delay τ UL11 , get the first delay difference Δτ UE , ΔτUE It can be expressed as: Δτ UE =2(τ OTA2 -τ OTA1 )+(τ Tx2 +τ Rx2 )-(τ Tx1 +τ Rx1 ),

[0174] It can be seen from the above formula that Δτ UE Contains τ OTA2 -τ OTA1 , because for different terminal devices, the air interface delay difference τ OTA2 -τ OTA1 Different, so for different terminal devices, Δτ UE The measurement results are different, Δτ UE It can be called the delay difference at the terminal device level.

[0175] The network side can also estimate the uplink delay value τ UL21 and the estimated uplink delay τ UL12 , get the second delay difference Δτ TRP , Δτ TRP It can be expressed as: Δτ TRP =(τ Tx2 -τ Rx2 )-(τ Tx1 -τ Rx1 )+2(τ clock2 -τ clock1 ),

[0176] It can be seen from the above formula that Δτ TRP Mainly includes the timing deviation τ of TRP1 and TRP2 clock2 -τ clock1 , and the delay difference τ between the receiving and transmitting channels Tx2 -τ Rx2 and τ Tx1 -τ Rx1 , therefore, Δτ TRP This can be called the TRP-level delay difference.

[0177] The network side can calculate the delay difference Δτ of the terminal device level corresponding to a terminal device. UE The delay difference Δτ with the TRP level TRP , determine the signal delay compensation amount Δτ when the first TRP and the second TRP provide CJT service for the terminal device UE +Δτ TRP : Δτ UE +Δτ TRP =2{(τ OTA2 -τ OTA1 )+(τ Tx2-τ Tx1 )+(τ clock2 -τ clock1 )}

[0178] The network side uses the delay compensation value Δτ UE +Δτ TRP The phase compensation amount corresponding to the phase difference between TRP signals on each subcarrier can be determined. By compensating the phase difference on each subcarrier, the transmission performance of CJT can be improved.

[0179] In one embodiment, for TRP-level delay, the network side can configure multiple terminal devices to execute the above S601 and S602. Each of the above terminal devices receives multiple reference signals to obtain corresponding measurement quantities, pre-compensates the corresponding multiple uplink reference signals based on the multiple measurement quantities, and sends the multiple uplink reference signals after pre-compensation. At this time, the network side can measure and obtain multiple TRP-level delays Δτ based on the uplink reference signals sent by the multiple terminal devices. TRP Estimated value, averaging the delay of multiple TRP levels can achieve the averaging of the estimation error and improve the TRP level delay difference Δτ TRP For example, if the number of terminal devices providing CJT services in the first TRP and the second TRP is L, the TRP-level delay difference measured by the network side based on multiple uplink reference signals sent by terminal device l can be recorded as Δτ TRP,l , averaging the TRP-level delay differences corresponding to L terminal devices can obtain a higher-precision TRP-level average delay difference

[0180] According to the above scheme, the terminal device receives multiple downlink reference signals and determines multiple uplink reference signals based on the delays obtained by measuring the multiple downlink reference signals. The terminal device sends the uplink reference signals to the network side, so that the network side can obtain the delay compensation amount between multiple TRPs based on the received uplink reference signals, and thus can determine the phase compensation amount corresponding to the phase difference between the TRP signals on each subcarrier. By compensating the phase difference on each subcarrier, the phase difference that varies with different subcarriers due to different timing deviations between TRPs is compensated, which can improve the transmission performance of the multiple TRPs when using CJT to transmit data to the terminal device. On the other hand, the terminal device does not need to quantize and report the measured measurement amount, which can reduce the reporting overhead of the terminal device and the quantization loss of the measurement amount, and improve the accuracy of the phase compensation amount obtained by the network side. The embodiments shown in Figures 4 and 6 above introduce that a terminal device receives multiple downlink reference signals sent from multiple TRPs, and assists the network side in compensating for the phase difference that varies with different subcarriers due to different timing deviations between TRPs by reporting the measurement amount or sending an uplink reference signal pre-compensated based on the measurement amount. In another implementation, the network side may configure multiple terminal devices to respectively receive downlink reference signals sent by different TRPs, such as one terminal device among multiple terminal devices may receive a downlink reference signal sent by one TRP. The multiple terminal devices respectively measure the received downlink reference signals, and respectively report to the network side the measurement quantities obtained by measuring the downlink reference signals they received, or send to the network side an uplink reference signal pre-compensated based on the measurement quantities. For example, a first terminal device receives a first downlink reference signal, and a second terminal device receives a second downlink reference signal. The first terminal device and the second terminal device may respectively report the measurement quantities obtained by measuring the downlink reference signals. The network side may respectively obtain the measurement quantities obtained by measuring the first downlink reference signal and the measurement quantities obtained by measuring the first downlink reference signal from the two terminal devices, thereby determining the phase compensation quantity on each subcarrier, so as to compensate for the phase difference on different subcarriers. Alternatively, the first terminal device and the second terminal device may respectively send an uplink reference signal determined based on a measurement amount obtained by measuring a downlink reference signal. For example, the first terminal device and the second terminal device may respectively send a first uplink reference signal and a second uplink reference signal. The network side may determine a phase compensation amount on each subcarrier based on the received first uplink reference signal and the second uplink reference signal, so as to compensate for the phase difference on different subcarriers. This can improve the transmission performance of CJT.

[0181] It is understandable that in order to implement the functions in the above embodiments, the TRP and the terminal on the network side include hardware structures and / or software modules corresponding to the execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0182] Figures 7 and 8 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the terminal device or TRP in the above-mentioned method embodiments, thereby also achieving the beneficial effects of the above-mentioned method embodiments. In the embodiments of the present application, the communication device can be one of the terminals 120a-120j shown in Figure 1, or it can be the network device 110a or 110b shown in Figure 1, or it can be a module (such as a chip or chip system) applied to a terminal or network device.

[0183] The communication device 700 includes a transceiver unit 720, which can be used to receive or send information. The communication device 700 can also include a processing unit 710, which can be used to process instructions or data to implement corresponding operations.

[0184] It should be understood that when the communication device 700 is a chip configured in (or used in) a communication device, the transceiver unit 720 in the communication device 700 can be the input / output interface or circuit of the chip, and the processing unit 710 in the communication device 700 can be the processor in the chip.

[0185] Optionally, the communication device 700 may further include a storage unit 730, which may be used to store instructions or data. The processing unit 710 may execute the instructions or data stored in the storage unit to enable the communication device to perform corresponding operations.

[0186] The communication device 700 can be used to implement the functions of the terminal device or TRP in the method embodiments shown in Figures 4 and 6 above.

[0187] When the communication device 700 is used to implement the functions of the terminal device in the method embodiment shown in Figure 4: the transceiver unit 720 is used to receive multiple downlink reference signals. The processing unit 710 is used to determine first information, where the first information is used to indicate at least one delay amount. The transceiver unit 720 is further used to send the first information. One of the at least one delay amount is the difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, or one of the at least one delay amount is the delay estimation value obtained by measuring one downlink reference signal among the multiple downlink reference signals.

[0188] When the communication device 700 is used to implement the functionality of the TRP in the method embodiment shown in FIG4 : the TRP transmits a second downlink reference signal; the TRP receives first information indicating at least one delay amount. One of the at least one delay amount is the difference between delay estimates of two downlink reference signals among a plurality of downlink reference signals; or one of the at least one delay amount is the delay estimate of one downlink reference signal among a plurality of downlink reference signals, wherein the plurality of downlink reference signals includes the second downlink reference signal.

[0189] For a more detailed description of the processing unit 710 and the transceiver unit 720 , reference may be made to the relevant description in the method embodiment shown in FIG. 4 .

[0190] When the communication device 700 is used to implement the functions of the terminal device in the method embodiment shown in Figure 6: the transceiver unit 720 is configured to receive multiple downlink reference signals. The transceiver unit 720 is configured to receive multiple downlink reference signals. The processing unit 710 is configured to determine each uplink reference signal from the multiple uplink reference signals based on a measurement value obtained by measuring the corresponding downlink reference signal. The transceiver unit 720 is further configured to transmit the multiple uplink reference signals.

[0191] When the communication device 700 is used to implement the TRP function in the method embodiment shown in FIG6 , the processing unit 710 is used to determine to send a third downlink reference signal, and the transceiver unit 720 is used to send the third downlink reference signal. The transceiver unit 720 is also used to receive a third uplink reference signal, wherein the first uplink reference signal is determined based on a measurement value of the third downlink reference signal.

[0192] For a more detailed description of the processing unit 710 and the transceiver unit 720 , reference may be made to the relevant description in the method embodiment shown in FIG6 .

[0193] 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 by at least one processor. The processing unit 710 in the communication device 700 can also be implemented by at least one logic circuit. Optionally, the communication device 700 also includes a storage unit, which can be implemented by a memory.

[0194] As shown in Figure 8, communication device 800 includes a processor 810 and an interface circuit 820. Processor 810 and interface circuit 820 are coupled to each other. It will be appreciated that interface circuit 820 may be a transceiver or an input / output interface. Optionally, communication device 800 may further include a memory 830 for storing instructions executed by processor 810, input data required by processor 810 to execute instructions, or data generated after processor 810 executes instructions.

[0195] In one implementation, the memory 830 may also be integrated into the processor 810 or independent of the processor 810 .

[0196] When the communication device 800 is used to implement the method shown in FIG. 4 , the processor 810 is used to implement the functions of the processing unit 710 , and the interface circuit 820 is used to implement the functions of the transceiver unit 720 .

[0197] When the communication device is a chip used in 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 in the terminal device (such as a radio frequency module or antenna), and the information is sent by the network device to the terminal device; or the terminal device chip sends information to other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the terminal device to the network device.

[0198] When the above-mentioned communication device is a module applied to a network device, the network device module can implement the function of the TRP in the above-mentioned method embodiment. The network device module receives information from other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the network device; or, the network device module sends information to other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal device. The network device module here can be a baseband chip of the network device, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

[0199] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0200] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in an access network device or a terminal device. The processor and storage medium can also exist in the access network device or the terminal device as discrete components.

[0201] According to the method provided in the embodiment of the application, the embodiment of the present application also provides a computer program product, which includes: computer program code, when the computer program code is executed by one or more processors, it enables the device including the processor to execute the method in the embodiments shown in Figures 4 and 6.

[0202] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device.

[0203] According to the method provided in the embodiments of the present application, the embodiments of the present application also provide a computer-readable storage medium, which stores the above-mentioned computer program or instructions. When the computer program or instructions are executed by one or more processors, the device including the processor executes the method in the embodiments shown in Figures 4 and 6.

[0204] As described above, the 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 via wired or wireless means. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0205] According to the method provided in the embodiment of the present application, the embodiment of the present application also provides a communication system, including one or more terminal devices mentioned above. The system may further include one or more TRPs mentioned above.

[0206] In the several embodiments provided in this 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. 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 coupling or direct coupling or communication connection between each other shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0207] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this solution based on actual needs.

[0208] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0209] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A signal transmission method, characterized in that: include: receiving a plurality of downlink reference signals; sending first information, where the first information is used to indicate at least one delay amount, One of the at least one delay amount is a difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, or, One of the at least one delay amount is a delay estimation value obtained by measuring one downlink reference signal among the multiple downlink reference signals.

2. The method according to claim 1, characterized in that One of the at least one delay amount is a difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N-1 delay amounts, where N is a positive integer; or, One of the at least one delay amount is a delay estimation value obtained by measuring a downlink reference signal among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N delay amounts.

3. The method according to claim 1 or 2, characterized in that: The first information is used to indicate at least one delay amount, including: the first information includes a quantization bit of each delay amount, The quantization bit is obtained based on the delay amount and the quantization interval, and the quantization interval is indicated by the network device through signaling; or, the quantization interval is determined by the terminal device, and the first information is also used to indicate the quantization interval.

4. The method according to claim 1 or 2, characterized in that: The first information is used to indicate at least one time delay, including: the first information indicates a phase position corresponding to each time delay in the at least one time delay and a bandwidth corresponding to the phase position.

5. The method according to any one of claims 1 to 4, characterized in that One of the at least one delay amounts occupies M bits in the first information, where M is predefined or preconfigured by the network device for the terminal device through signaling.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: Second information is received, where the second information is used to configure reporting of the at least one delay amount obtained by measuring the multiple downlink reference signals.

7. The method according to claim 6, characterized in that The second information is also used to indicate that the first downlink reference signal is a downlink reference signal used as a reference among the multiple downlink reference signals, and the at least one delay amount includes a difference between a delay estimation value obtained by measuring a reference signal other than the first downlink reference signal among the multiple downlink reference signals and a first delay estimation value, and the first delay estimation value is obtained by measuring the first downlink reference signal.

8. The method according to any one of claims 1 to 7, characterized in that The multiple downlink reference signals are reference signals from multiple TRPs.

9. The method according to claim 8, characterized in that The method further comprises: Receive data from the coherent joint transmission of the multiple TRPs, where the coherent joint transmission data is obtained by processing the at least one delay amount.

10. A signal transmission method, characterized in that: include: Sending a second downlink reference signal; receiving first information, wherein the first information is used to indicate at least one delay amount, Among them, one of the at least one delay amount is a difference between delay estimation values ​​of two downlink reference signals among the multiple downlink reference signals; or, One of the at least one delay amount is a delay estimation value of a downlink reference signal among the multiple downlink reference signals; The multiple downlink reference signals include the second downlink reference signal.

11. The method according to claim 10, characterized in that The method further comprises: Phase compensation amounts corresponding to the multiple downlink reference signals are determined according to the at least one time delay amount.

12. The method according to claim 10 or 11, characterized in that: One of the at least one delay amount is a difference between delay estimation values ​​obtained by measuring two downlink reference signals among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N-1 delay amounts, where N is a positive integer; or, One of the at least one delay amount is a delay estimation value obtained by measuring a downlink reference signal among the multiple downlink reference signals, the multiple downlink reference signals include N downlink reference signals, and the at least one delay amount includes N delay amounts.

13. The method according to any one of claims 10 to 12, characterized in that The first information is used to indicate at least one delay amount, including: the first information includes a quantization bit of each delay amount, The quantization bit is obtained based on the delay amount and the quantization interval, and the quantization interval is indicated by the network device through signaling; or, the quantization interval is determined by the terminal device, and the first information is also used to indicate the quantization interval.

14. The method according to any one of claims 10 to 12, characterized in that The first information is used to indicate at least one time delay, including: the first information indicates a phase position corresponding to each time delay in the at least one time delay and a bandwidth corresponding to the phase position.

15. The method according to any one of claims 10 to 14, characterized in that One of the at least one delay amounts occupies M bits in the first information, where M is predefined or preconfigured by the network device for the terminal device through signaling.

16. The method according to any one of claims 10 to 15, characterized in that The method further comprises: Send second information, where the second information is used to configure the terminal device to report the at least one delay amount obtained by measuring the multiple downlink reference signals.

17. The method according to claim 16, characterized in that The second information is also used to indicate that the first downlink reference signal is a downlink reference signal used as a reference among the multiple downlink reference signals, and the at least one delay amount includes a difference between a delay estimation value obtained by measuring a reference signal other than the first downlink reference signal among the multiple downlink reference signals and a first delay estimation value, and the first delay estimation value is obtained by measuring the first downlink reference signal.

18. The method according to any one of claims 10 to 17, characterized in that The multiple downlink reference signals are reference signals sent by multiple TRPs.

19. The method according to claim 18, characterized in that The method further comprises: Send data for coherent joint transmission with at least one TRP, wherein the coherent joint transmission data is obtained by processing the at least one delay amount.

20. A signal transmission method, characterized in that: include: receiving a plurality of downlink reference signals; A plurality of uplink reference signals are sent, wherein the plurality of uplink reference signals correspond to the plurality of downlink reference signals, and each uplink reference signal in the plurality of uplink reference signals is determined according to a measurement amount obtained by measuring a corresponding downlink reference signal.

21. The method according to claim 20, characterized in that The method further comprises: Third information is received, where the third information is used to indicate a correspondence between the multiple downlink reference signals and the multiple uplink reference signals.

22. The method according to claim 20 or 21, characterized in that The multiple uplink reference signals correspond one-to-one to the multiple downlink reference signals.

23. The method according to any one of claims 20 to 22, characterized in that The measurement amount is used for phase compensation or delay compensation of an uplink reference signal.

24. A signal transmission method, characterized in that: include: Sending a third downlink reference signal; A third uplink reference signal is received, wherein the third uplink reference signal is determined according to a measurement amount of the third downlink reference signal.

25. The method according to claim 24, characterized in that The method further comprises: sending third information, where the third information is used to indicate a correspondence between a plurality of downlink reference signals and a plurality of uplink reference signals, wherein an uplink reference signal in the correspondence is determined based on a measurement amount obtained by measuring a corresponding downlink reference signal, Among them, the third downlink reference signal in the corresponding relationship corresponds to the third uplink reference signal.

26. The method according to claim 25, characterized in that The multiple uplink reference signals correspond one-to-one to the multiple downlink reference signals.

27. The method according to claim 25 or 26, characterized in that The multiple uplink reference signals correspond to multiple transmission points, and the method further includes: determining a first delay difference according to a first uplink delay estimation value and a second uplink delay estimation value, wherein the first uplink delay estimation value is obtained according to an uplink reference signal corresponding to the first transmission point received by the first transmission point, and the second uplink delay estimation value is obtained according to an uplink reference signal corresponding to the second transmission point received by the second transmission point; determining a second delay difference according to a third uplink delay estimation value and a fourth uplink delay estimation value, wherein the third uplink delay estimation value is obtained according to an uplink reference signal corresponding to the second transmission point received by the first transmission point, and the fourth uplink delay estimation value is obtained according to an uplink reference signal corresponding to the first transmission point received by the second transmission point; A delay compensation amount for data coherently jointly transmitted by the first transmission point and the second transmission point is determined according to the first delay difference and the second delay difference.

28. The method according to any one of claims 24 to 27, characterized in that The measurement amount is used for phase compensation or delay compensation of an uplink reference signal.

29. A communication device, characterized in that: For implementing the method according to any one of claims 1 to 9, or for implementing the method according to any one of claims 10 to 19, or for executing the method according to any one of claims 20 to 23, or for executing the method according to any one of claims 24 to 28.

30. 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 used to execute the program or instructions so that the device implements the method as described in any one of claims 1 to 9, or implements the method as described in any one of claims 10 to 19, or implements the method as described in any one of claims 20 to 23, or implements the method as described in any one of claims 24 to 28.

31. 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 28.

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