A collaborative transmission method and communication device

Abstract

A collaborative transmission method and communication device can be applied to vehicle networks, such as V2X, LTE‑V, V2V, etc. The method includes: a first terminal device receives a first reference signal from a network device to obtain a measurement value of the first reference signal, receives a second reference signal from a second terminal device to obtain a measurement value of the second reference signal, determines a comprehensive channel quality parameter based on the measurement value of the first reference signal and / or the measurement value of the second reference signal, and sends the comprehensive channel quality parameter to the network device or the second terminal device, and the comprehensive channel quality parameter is used to determine at least one terminal device for collaborative transmission with the second terminal device. Since the comprehensive channel quality parameter can comprehensively reflect the comprehensive channel quality between the first terminal device and the network device and the second terminal device, a more suitable collaborative terminal device can be selected to effectively improve the collaborative transmission performance.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a collaborative transmission method and a communication device. Background Art

[0002] In the vehicle to everything (V2X) communication system, the terminal device and the network device can communicate through the Uu interface, and the communication links used include uplink and downlink. At the same time, the terminal devices can also communicate directly through the PC5 interface, and the communication link used is called the side-link. The side-link between the terminal devices can be used for user collaborative communication.

[0003] User cooperative communication is an effective means to improve system capacity and network coverage. For a target user equipment (TUE), the TUE can form a user cooperation group with at least one cooperation user equipment (CUE). The base station can send data to the TUE and the related CUE, and then the CUE forwards the correctly received data to the TUE through the side link. The TUE performs joint decoding based on the data directly received from the base station and the data received from the CUE, thereby improving the reception performance. Alternatively, the TUE may not receive data from the base station, but only receive data from the CUE and decode it.

[0004] In the prior art, there is no solution for determining the CUE for user collaboration. If the CUE is not properly selected, the transmission performance of the TUE will be affected. Summary of the invention

[0005] The embodiments of the present application provide a collaborative transmission method and a communication device for determining a CUE for user collaboration and improving the transmission performance of a TUE.

[0006] In a first aspect, an embodiment of the present application provides a collaborative transmission method, which can be applied to a first terminal device, and the method includes: the first terminal device receives a first reference signal from a network device, and obtains a measurement value of the first reference signal; the first terminal device receives a second reference signal from a second terminal device, and obtains a measurement value of the second reference signal; the first terminal device determines a comprehensive channel quality parameter based on the measurement value of the first reference signal and / or the measurement value of the second reference signal, and the comprehensive channel quality parameter is used to determine at least one terminal device for collaborative transmission with the second terminal device; the first terminal device sends the comprehensive channel quality parameter to the network device or the second terminal device.

[0007] By adopting the technical solution provided in the embodiment of the present application, the first terminal device can send a comprehensive channel quality parameter to the network device or the second terminal device, and the network device or the second terminal device determines at least one terminal device for cooperative transmission with the second terminal device based on the comprehensive channel quality parameter. Since the comprehensive channel quality parameter is determined based on the measurement value of the first reference signal sent by the network device and the measurement value of the second reference signal sent by the second terminal device, when determining the cooperative terminal device of the second terminal device, the two factors of the channel quality between the first terminal device and the network device and the channel quality between the first terminal device and the second terminal device can be comprehensively considered, thereby improving the effectiveness of the selection of the cooperative terminal device and enhancing the transmission performance and reliability of the second terminal device.

[0008] In one possible design, the second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method also includes: the first terminal device receives first configuration information or indication information of the first configuration information from the second terminal device, and the first configuration information indicates parameters used to transmit the SL CSI-RS; the first terminal device receives the second reference signal from the second terminal device, including: the first terminal device receives the SL CSI-RS according to the first configuration information.

[0009] In one possible design, the second reference signal is a sounding reference signal SRS, which is sent by the second terminal device to the network device; the method also includes: the first terminal device receives second configuration information or indication information of the second configuration information from the network device, and the second configuration information indicates parameters for transmitting the SRS; the first terminal device receives the second reference signal from the second terminal device, including: the first terminal device receives the SRS according to the second configuration information.

[0010] In one possible design, the second configuration information includes an identifier of the second terminal device.

[0011] In one possible design, the first reference signal is a channel state information reference signal CSI-RS; the method also includes: the first terminal device receives third configuration information or indication information of the third configuration information from a network device, and the third configuration information indicates parameters used to transmit CSI-RS; the first terminal device receives the first reference signal from the network device, including: the first terminal device receives the CSI-RS according to the third configuration information.

[0012] By adopting the technical solution provided in the embodiment of the present application, the first reference signal and the second reference signal may have multiple possible implementation methods. For example, the first reference signal may be a CSI-RS sent by a network device through a downlink, and the second reference signal may be an SL CSI-RS sent by a second terminal device through a sidelink. In this way, the first terminal device may determine the channel quality on the downlink and the sidelink respectively according to the received CSI-RS and SL CSI-RS, thereby helping to decide whether the first terminal device can serve as a cooperative terminal device for the second terminal device.

[0013] For another example, the first reference signal can be the CSI-RS sent by the network device through the downlink, and the second reference signal can reuse the SRS sent by the second terminal device to the network device through the uplink. In this way, the second terminal device does not need to send the SL CSI-RS to the first terminal device on the side link, and does not even need to configure the SL CSI-RS additionally, thereby further reducing the signaling overhead of the side link. In this scenario, since the first terminal device needs to listen to the SRS sent by the second terminal device to the network device, the network device can also carry the identifier of the second terminal device in the configuration information when notifying the first terminal device of the configuration of the SRS of the second terminal device, so that the first terminal device can listen to the SRS sent by the second terminal device instead of the SRS of other terminal devices, thereby improving the efficiency of collaborative transmission.

[0014] In one possible design, before the first terminal device sends the comprehensive channel quality parameter to the network device or the second terminal device, it also includes: the first terminal device determines that the measurement value of the first reference signal is greater than or equal to the first threshold, and\or the measurement value of the second reference signal is greater than or equal to the second threshold; and\or, the first terminal device determines that the comprehensive channel quality parameter is greater than or equal to a third threshold.

[0015] By adopting the technical solution provided in the embodiment of the present application, the measured value of the first reference signal, the measured value of the second reference signal, and the comprehensive channel quality parameter may all have corresponding thresholds, and the first terminal device may not send the comprehensive channel quality parameter when the measured value of the first reference signal or the measured value of the second reference signal is less than the corresponding threshold, or when the determined comprehensive channel quality parameter is less than the corresponding threshold. In this way, if the first terminal device sends the comprehensive channel quality parameter to the network device or the second terminal device, it means that the channel quality between the first terminal device and the network device and the second terminal device is good, which can make the comprehensive channel quality parameter sent by the first terminal device more valuable for reference. This can improve the effectiveness of determining the cooperative terminal device.

[0016] In one possible design, the method also includes: the first terminal device receives first indication information from the network device, and the first indication information indicates the difference between the transmit power of the first reference signal and the transmit power of the second reference signal; in this way, the first terminal device determines the comprehensive channel quality parameter based on the measured value of the first reference signal and / or the measured value of the second reference signal, which may include: the first terminal device determines the comprehensive channel quality parameter based on the measured value of the first reference signal, the measured value of the second reference signal and the difference.

[0017] By adopting the technical solution provided in the embodiment of the present application, when determining the comprehensive channel quality parameter, the first terminal device may also consider the difference between the transmit power of the first reference signal sent by the network device and the transmit power of the second reference signal sent by the second terminal device, so that the comprehensive channel quality parameter determined by the first terminal device is more accurate, thereby determining a more suitable cooperative terminal device for the second terminal device and improving the cooperative transmission performance. Moreover, the network device can indicate the difference in transmit power to the first terminal device, which can also enable the embodiment of the present application to be applicable to the scenario where there is a difference in transmit power between the first reference signal and the second reference signal, making the embodiment of the present application more adaptable.

[0018] In one possible design, the method also includes: the first terminal device receives second indication information from the network device, and the second indication information instructs the first terminal device to send a comprehensive channel quality parameter to the network device or the second terminal device.

[0019] By adopting the technical solution provided in the embodiment of the present application, the network device can decide whether the first terminal device can be a cooperative terminal device of the second terminal device, or the second terminal device can decide whether the first terminal device can be a cooperative terminal device of the second terminal device. Therefore, the network device can indicate to the first terminal device: to whom the comprehensive channel quality parameters need to be sent. That is, when the network device is responsible for making decisions on cooperative terminal devices, the first terminal device can send the comprehensive channel quality parameters to the network device, and when the second terminal device is responsible for making decisions on cooperative terminal devices, the first terminal device can send the comprehensive channel quality parameters to the second terminal device.

[0020] In one possible design, the comprehensive channel quality parameter is a function of the measured value of the first reference signal and / or the measured value of the second reference signal; thus, the first terminal device determines the comprehensive channel quality parameter, which may include: the first terminal device determines the comprehensive channel quality parameter based on the measured value of the first reference signal and / or the measured value of the second reference signal and the function.

[0021] In one possible design, the function satisfies the following relationship: i =min{α i , S_α i}, or β i =(1-γ i )α i +γ i S_α i}. Among them, β i is the comprehensive channel quality parameter, α i is the measured value of the first reference signal, S_α i is the measured value of the second reference signal, γ i is the weight and 0≤γ i ≤1.

[0022] In one possible design, the measurement value is any one of the reference signal received power RSRP, the received signal strength indication RSSI, the reference signal received quality RSSQ, and the channel noise and interference ratio SINR, thereby improving the applicability of the embodiments of the present application.

[0023] In one possible design, the first terminal device may also send the measurement value of the first reference signal and / or the measurement value of the second reference channel directly to the network device or the second terminal device, and the network device or the second terminal device may determine the comprehensive channel quality parameter by itself based on the measurement value of the first reference signal and / or the measurement value of the second reference channel using the above method, and then determine the terminal device for collaborative transmission with the second terminal device.

[0024] In a second aspect, an embodiment of the present application provides another collaborative transmission method, which can be applied to a network device, and the method includes: the network device sends a first reference signal to a first terminal device; the network device receives a comprehensive channel quality parameter from the first terminal device, and the comprehensive channel quality parameter is determined by the first terminal device based on a measurement value of the first reference signal and / or a measurement value of a second reference signal, and the second reference signal is a reference signal received by the first terminal device from the second terminal device; the network device determines at least one terminal device for collaborative transmission with the second terminal device based on the comprehensive channel quality parameter.

[0025] By adopting the technical solution provided in the embodiment of the present application, since the comprehensive channel quality parameter is determined by the first terminal device based on the measurement value of the first reference signal sent by the network device and the measurement value of the second reference signal sent by the second terminal device, when the network device determines at least one terminal device for collaborative transmission with the second terminal device based on the comprehensive channel quality parameter, it can comprehensively consider the two factors of the channel quality between the first terminal device and the network device and the channel quality between the first terminal device and the second terminal device, thereby improving the effectiveness of the selection of the collaborative terminal device and enhancing the transmission performance and reliability of the second terminal device.

[0026] In one possible design, the second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method also includes: the network device sends first configuration information or indication information of the first configuration information to the second terminal device, and the first configuration information indicates parameters for transmitting the SL CSI-RS.

[0027] In one possible design, the second reference signal is a sounding reference signal SRS; the method also includes: the network device sends second configuration information or indication information of the second configuration information to the first terminal device and the second terminal device, and the second configuration information indicates parameters for transmitting the SRS.

[0028] In one possible design, the second configuration information includes an identifier of the second terminal device.

[0029] In one possible design, the first reference signal is a channel state information reference signal CSI-RS; the method also includes: the network device sends third configuration information or indication information of the third configuration information to the first terminal device, and the third configuration information indicates parameters used to transmit CSI-RS.

[0030] By adopting the technical solution provided in the embodiment of the present application, the first reference signal and the second reference signal may have multiple possible implementation methods. For example, the first reference signal may be a CSI-RS sent by a network device through a downlink, and the second reference signal may be an SL CSI-RS sent by a second terminal device through a sidelink. In this way, the first terminal device may determine the channel quality on the downlink and the sidelink respectively according to the received CSI-RS and SL CSI-RS, thereby helping to decide whether the first terminal device can serve as a cooperative terminal device for the second terminal device.

[0031] For another example, the first reference signal can be the CSI-RS sent by the network device through the downlink, and the second reference signal can reuse the SRS sent by the second terminal device to the network device through the uplink. In this way, the second terminal device does not need to send the SL CSI-RS to the first terminal device on the side link, and does not even need to configure the SL CSI-RS additionally, thereby further reducing the signaling overhead of the side link. In this scenario, since the first terminal device needs to listen to the SRS sent by the second terminal device to the network device, the network device can also carry the identifier of the second terminal device in the configuration information when notifying the second terminal device of the configuration of the SRS, so that the first terminal device can listen to the SRS sent by the second terminal device instead of the SRS of other terminal devices, thereby improving the efficiency of collaborative transmission.

[0032] In one possible design, the method also includes: the network device sends first indication information to the first terminal device, where the first indication information is used to indicate a deviation between a transmit power of the first reference signal and a transmit power of the second reference signal.

[0033] By adopting the technical solution provided in the embodiment of the present application, when determining the comprehensive channel quality parameter, the first terminal device may also consider the difference between the transmit power of the first reference signal sent by the network device and the transmit power of the second reference signal sent by the second terminal device, so that the comprehensive channel quality parameter determined by the first terminal device is more accurate, thereby determining a more suitable cooperative terminal device for the second terminal device and improving the cooperative transmission performance. Moreover, the network device can indicate the difference in transmit power to the first terminal device, which can also enable the embodiment of the present application to be applicable to the scenario where there is a difference in transmit power between the first reference signal and the second reference signal, making the embodiment of the present application more adaptable.

[0034] In one possible design, the method also includes: the network device sends second indication information to the first terminal device, and the second indication information instructs the first terminal device to send a comprehensive channel quality parameter to the network device or the second terminal device.

[0035] By adopting the technical solution provided in the embodiment of the present application, the network device can decide whether the first terminal device can be a cooperative terminal device of the second terminal device, or the second terminal device can decide whether the first terminal device can be a cooperative terminal device of the second terminal device. Therefore, the network device can indicate to the first terminal device: to whom the comprehensive channel quality parameters need to be sent. That is, when the network device is responsible for making decisions on cooperative terminal devices, the first terminal device can send the comprehensive channel quality parameters to the network device, and when the second terminal device is responsible for making decisions on cooperative terminal devices, the first terminal device can send the comprehensive channel quality parameters to the second terminal device.

[0036] In one possible design, the composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

[0037] In one possible design, the function satisfies the following relationship: i =min{α i , S_α i}, or β i =(1-γ i )α i +γ i S_α i}. Among them, β i is the comprehensive channel quality parameter, α i is the measured value of the first reference signal, S_α i is the measured value of the second reference signal, γi is the weight and 0≤γ i ≤1.

[0038] In one possible design, the measurement value is any one of the reference signal received power RSRP, the received signal strength indication RSSI, the reference signal received quality RSSQ, and the channel noise and interference ratio SINR, thereby improving the applicability of the embodiments of the present application.

[0039] In one possible design, the network device may also receive the measurement value of the first reference signal and / or the measurement value of the second reference channel directly sent by the first terminal device, and then determine the comprehensive channel quality parameter by itself based on the measurement value of the first reference signal and / or the measurement value of the second reference channel using the above method, and then determine the terminal device for collaborative transmission with the second terminal device.

[0040] In a third aspect, an embodiment of the present application provides another collaborative transmission method, which can be applied to a second terminal device, and the method includes: the second terminal device sends a second reference signal to the first terminal device; the second terminal device receives a comprehensive channel quality parameter from the first terminal device, and the comprehensive channel quality parameter is determined by the first terminal device based on a measurement value of the first reference signal and / or a measurement value of the second reference signal, and the first reference signal is a reference signal received by the first terminal device from a network device; the second terminal device determines at least one terminal device for collaborative transmission with the second terminal device based on the comprehensive channel quality parameter.

[0041] By adopting the technical solution provided in the embodiment of the present application, since the comprehensive channel quality parameter is determined by the first terminal device based on the measurement value of the first reference signal sent by the network device and the measurement value of the second reference signal sent by the second terminal device, when the second terminal device determines at least one terminal device for collaborative transmission with the second terminal device based on the comprehensive channel quality parameter, the two factors of the channel quality between the first terminal device and the network device and the channel quality between the first terminal device and the second terminal device can be comprehensively considered, thereby improving the effectiveness of the selection of the collaborative terminal device and enhancing the transmission performance and reliability of the second terminal device.

[0042] In one possible design, the second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method also includes: the second terminal device receives first configuration information or indication information of the first configuration information from the network device, and the first configuration information indicates parameters for transmitting the SL CSI-RS.

[0043] In one possible design, the second reference signal is an uplink sounding reference signal SRS; the method also includes: the network device sends second configuration information or indication information of the second configuration information to the second terminal device, and the second configuration information indicates parameters for transmitting the SRS.

[0044] In one possible design, the second configuration information includes an identifier of the second terminal device.

[0045] In one possible design, the first reference signal is a channel state information reference signal CSI-RS.

[0046] By adopting the technical solution provided in the embodiment of the present application, the first reference signal and the second reference signal may have multiple possible implementation methods. For example, the first reference signal may be a CSI-RS sent by a network device through a downlink, and the second reference signal may be an SL CSI-RS sent by a second terminal device through a sidelink. In this way, the first terminal device may determine the channel quality on the downlink and the sidelink respectively according to the received CSI-RS and SL CSI-RS, thereby helping to decide whether the first terminal device can serve as a cooperative terminal device for the second terminal device.

[0047] For another example, the first reference signal can be the CSI-RS sent by the network device through the downlink, and the second reference signal can reuse the SRS sent by the second terminal device to the network device through the uplink. In this way, the second terminal device does not need to send the SL CSI-RS to the first terminal device on the side link, and does not even need to configure the SL CSI-RS additionally, thereby further reducing the signaling overhead of the side link. In this scenario, since the first terminal device needs to listen to the SRS sent by the second terminal device to the network device, the network device can also carry the identifier of the second terminal device in the configuration information when notifying the second terminal device of the configuration of the SRS, so that the first terminal device can listen to the SRS sent by the second terminal device instead of the SRS of other terminal devices, thereby improving the efficiency of collaborative transmission.

[0048] In one possible design, the composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

[0049] In one possible design, the function satisfies the following relationship: i =min{α i , S_α i}, or β i =(1-γ i )α i +γ i S_α i}. Among them, β i is the comprehensive channel quality parameter, αi is the measured value of the first reference signal, S_α i is the measured value of the second reference signal, γ i is the weight and 0≤γ i ≤1.

[0050] In one possible design, the measurement value is any one of the reference signal received power RSRP, the received signal strength indication RSSI, the reference signal received quality RSSQ, and the channel noise and interference ratio SINR, thereby improving the applicability of the embodiments of the present application.

[0051] In one possible design, the second terminal device may also receive the measurement value of the first reference signal and / or the measurement value of the second reference channel directly sent by the first terminal device, and then determine the comprehensive channel quality parameter by itself based on the measurement value of the first reference signal and / or the measurement value of the second reference channel using the above method, and then determine the terminal device for collaborative transmission with the second terminal device.

[0052] In a fourth aspect, an embodiment of the present application provides a communication device, which has the function of implementing the first aspect or any possible design of the first aspect, or has the function of implementing the third aspect or any possible design of the third aspect. The communication device can be a terminal device, such as a handheld terminal device, a vehicle-mounted terminal device, etc., or it can be a device included in the terminal device, such as a chip, or it can be a device including the terminal device. The functions of the above-mentioned terminal devices can be implemented by hardware, or they can be implemented by hardware executing corresponding software, and the hardware or software includes one or more modules corresponding to the above-mentioned functions.

[0053] The communication device may also have the function of implementing the second aspect or any possible design of the second aspect. The communication device may be a network device, such as a base station, or a device included in the network device, such as a chip. The functions of the above network device may be implemented by hardware, or by hardware executing corresponding software, and the hardware or software includes one or more modules corresponding to the above functions.

[0054] In one possible design, the structure of the communication device includes a processing module and a transceiver module, wherein the processing module is configured to support the communication device to perform the corresponding functions in the above-mentioned first aspect or any one of the designs of the first aspect, or to perform the corresponding functions in the above-mentioned second aspect or any one of the designs of the second aspect, or to perform the corresponding functions in the above-mentioned third aspect or any one of the designs of the third aspect. The transceiver module is used to support the communication between the communication device and other communication devices. For example, when the communication device is a first terminal device, it can receive a first reference signal from a network device and a second reference signal from a second terminal device. The communication device may also include a storage module, which is coupled to the processing module and stores program instructions and data necessary for the communication device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory. The memory may be integrated with the processor or may be separately provided from the processor, which is not limited in the present application.

[0055] In another possible design, the structure of the communication device includes a processor and may also include a memory. The processor is coupled to the memory and can be used to execute computer program instructions stored in the memory so that the communication device executes the method in the first aspect or any possible design of the first aspect, or executes the method in the second aspect or any possible design of the second aspect, or executes the method in the third aspect or any possible design of the third aspect. Optionally, the communication device also includes a communication interface, and the processor is coupled to the communication interface. When the communication device is a terminal device, the communication interface can be a transceiver or an input / output interface; when the communication device is a chip included in the terminal device, the communication interface can be an input / output interface of the chip. Optionally, the transceiver can be a transceiver circuit, and the input / output interface can be an input / output circuit.

[0056] In a fifth aspect, an embodiment of the present application provides a chip system, comprising: a processor, the processor being coupled to a memory, the memory being used to store programs or instructions, and when the programs or instructions are executed by the processor, the chip system implements any possible method in a design of the first aspect, or implements any possible method in a design of the second aspect, or implements any possible method in a design of the third aspect.

[0057] Optionally, the processor in the chip system may be one or more. The processor may be implemented by hardware or by software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc. When implemented by software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

[0058] Optionally, the memory in the chip system may be one or more. The memory may be integrated with the processor or may be separately provided with the processor, which is not limited in the present application. Exemplarily, the memory may be a non-transient processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip or may be provided on different chips. The present application does not specifically limit the type of memory and the arrangement of the memory and the processor.

[0059] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-readable instructions are stored. When a computer reads and executes the computer-readable instructions, the computer executes a method in any possible design of the first aspect, or executes a method in any possible design of the second aspect, or executes a method in any possible design of the third aspect.

[0060] In the seventh aspect, an embodiment of the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes a method in any possible design of the first aspect, or executes a method in any possible design of the second aspect, or executes a method in any possible design of the third aspect.

[0061] In an eighth aspect, an embodiment of the present application provides a communication system, which includes the network device, the first terminal device and the second terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1a and Figure 1b A schematic diagram of a network architecture of a communication system applicable to an embodiment of the present application;

[0063] Figure 2 A schematic diagram of a process flow of a collaborative transmission method provided in an embodiment of the present application;

[0064] Figure 3 This is a schematic diagram of a collaborative transmission process when the first reference signal is CSI-RS and the second reference signal is SL CSI-RS in an embodiment of the present application;

[0065] Figure 4 This is a schematic diagram of a collaborative transmission process when the first reference signal is a CSI-RS and the second reference signal is an SRS in an embodiment of the present application;

[0066] Figure 5 These are multiple potential CUEs in the user collaboration group provided in the embodiments of the present application.

[0067] Figure 6 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0068] Figure 7 Another structural schematic diagram of a communication device provided in an embodiment of the present application;

[0069] Figure 8 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0070] Fig. 9 Another structural schematic diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0072] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WIMAX) communication system, fifth generation (5G) system or new radio (NR) system, or applied to future communication systems or other similar communication systems.

[0073] Furthermore, the embodiments of the present application may also be applied to an evolved universal mobile telecommunications system terrestrial radio access network (E-UTRAN) system, or a next generation (NG)-RAN system, or may also be applied to a next generation communication system or a similar communication system.

[0074] Please refer to Figure 1a and Figure 1b , is a schematic diagram of a network architecture of a communication system applicable to an embodiment of the present application. The communication system includes a network device 110, a terminal device 120, a terminal device 130, and a terminal device 140. Among them, the terminal device 120, the terminal device 130, and the terminal device 140 belong to a user collaboration group, the terminal device 120 is a TUE in the user collaboration group, and the terminal device 130 and the terminal device 140 are CUEs in the user collaboration group.

[0075] exist Figure 1a In the scenario shown, collaborative transmission includes two stages. In the first stage, the network device 110 sends data to the terminal device 120, the terminal device 130 and the terminal device 140, for example, in the form of multicast. In the second stage, the terminal device 130 and the terminal device 140 respectively send the received data to the terminal device 120 via the side link. Before sending the received data to the terminal device 120, the terminal device 130 and the terminal device 140 may also amplify, decode, compress, etc. the data, which is not limited in this application. In this way, the terminal device 120 can jointly decode the data received from the network device 110 in the first stage and the data received from the terminal device 130 and the terminal device 140 in the second stage, thereby improving the receiving performance.

[0076] exist Figure 1b In the scenario shown, the cooperative transmission also includes two phases. In the first phase, the network device 110 sends data to the terminal device 130 and the terminal device 140. Because the terminal device 120 is out of the cell coverage or the channel quality of the terminal device 120 is too poor, the terminal device 120 does not receive data from the network device 110 in the first phase. Only in the second phase, the forwarded data is received from the terminal device 130 and the terminal device 140 for joint decoding.

[0077] Figure 1a and Figure 1bThe network device in the system may be an access network device, such as a base station. The access network device corresponds to different devices in different systems. For example, in the fourth generation mobile communication technology (the 4 th In a 4G generation (4G) system, it can correspond to an evolved base station (Evolutional Node B, eNB), and in a 5G system, it can correspond to an access network device in 5G, such as a gNB.

[0078] Figure 1a and Figure 1b The user cooperation group in the may include terminal device 120, terminal device 130 and terminal device 140, or may only include terminal device 120 and terminal device 130. That is to say, in a user cooperation group, a TUE may have one or more CUEs serving it. In a cell, there may be multiple different user cooperation groups. For a terminal device, it may be a TUE of a user cooperation group centered on itself, or it may be a CUE of one or more other user cooperation groups.

[0079] It should be understood that Figure 1a and Figure 1b The terminal devices 120, 130 and 140 shown in the figure are only examples. The network device can provide services for multiple terminal devices. The present application does not specifically limit the number of terminal devices in the communication system. Figure 1a and Figure 1b The terminal device in the example is a mobile phone, but the present application is not limited thereto, and the terminal device may also be other types of terminal devices, such as a vehicle-mounted terminal device or a vehicle, etc. It should also be understood that the embodiments of the present application are not limited to 4G or 5G systems, but are also applicable to subsequently evolved communication systems.

[0080] Below, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0081] 1) Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice and / or data connectivity to users. The terminal equipment can communicate with the core network via the radio access network (RAN) and exchange voice and / or data with the RAN. For example, the terminal equipment can be a handheld device, a vehicle-mounted device, etc. with a wireless connection function. At present, some examples of terminal equipment are: mobile phones, tablet computers, laptops, PDAs, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. The terminal device in the embodiment of the present application can also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit that is built into the vehicle as one or more components or units. The vehicle can implement the method provided in the embodiment of the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit.

[0082] 2) Network equipment is a device in the network used to connect terminal devices to the wireless network. The network equipment can be a node in the wireless access network, which can also be called a base station, or a radio access network (RAN) node (or device). The network equipment can be used to convert received air frames to and from Internet Protocol (IP) packets, and act as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The network equipment can also coordinate the attribute management of the air interface. For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or may also include a next generation node B (next generation node B, gNB) in a fifth generation mobile communication technology (5th generation, 5G) new radio (new radio, NR) system, or may also include a transmission reception point (transmission reception point, TRP), a home base station (for example, home evolved NodeB, or home Node B, HNB), a base band unit (base band unit, BBU), or a WiFi access point (access point, AP), etc., or may also include a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) in a cloud access network (cloud radio access network, CloudRAN) system, and the embodiments of the present application are not limited. For another example, a network device in a V2X technology is a road side unit (RSU). The RSU may be a fixed infrastructure entity that supports V2X applications and may exchange messages with other entities that support V2X applications.

[0083] 3) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" means two or more than two. In view of this, in the embodiments of the present application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C can be included. Similarly, the understanding of descriptions such as "at least one" is similar. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previously associated objects are in an "or" relationship.

[0084] Unless otherwise specified, the embodiments of the present application mention ordinal numbers such as "first" and "second" for distinguishing between multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects, and the descriptions of "first" and "second" do not limit the objects to be different.

[0085] Please refer to Figure 2 , is a flow chart of a collaborative transmission method provided in an embodiment of the present application, the method comprising the following steps S201 to S206:

[0086] Step S201: A network device sends a first reference signal to a first terminal device.

[0087] The first terminal device is a potential cooperative terminal device CUE. The network device may send a first reference signal to the first terminal device so that the first terminal device reports the channel quality between itself and the network device. The channel quality between the first terminal device and the network device may be used to determine whether the first terminal device can serve as a cooperative terminal device for the second terminal device.

[0088] The first reference signal may be a channel state information reference signal (CSI-RS). In an embodiment of the present application, the network device may configure the first reference signal for the first terminal device. For example, the network device may send first configuration information or indication information of the first configuration information to the first terminal device, and the first configuration information indicates parameters for transmitting CSI-RS, so that the first terminal device may receive CSI-RS from the network device according to the first configuration information. The parameters for transmitting CSI-RS may include, for example, the time-frequency resources occupied by CSI-RS, etc.

[0089] Step S202: The first terminal device receives the first reference signal from the network device and obtains a measurement value of the first reference signal.

[0090] The first terminal device may receive and measure a first reference signal from the network device, and the measured value of the first reference signal may reflect the channel quality between the first terminal device and the network device. The measured value may be any one of a reference signal received power (RSRP), a received signal strength indicator (RSSI), a reference signal received quality (RSSQ), a channel noise and interference ratio (SINR), and a path loss. The higher the RSRP of the CSI-RS, the better the channel quality between the first terminal device and the network device, and the same is true for RSSI, RSSQ, and SINR.

[0091] Step S203: The second terminal device sends a second reference signal to the first terminal device.

[0092] The second terminal device is a target terminal device TUE, that is, a terminal device that needs other terminal devices to cooperate for data transmission. The second terminal device can send a second reference signal to the first terminal device so that the first terminal device reports the channel quality between itself and the second terminal device. The channel quality between the first terminal device and the second terminal device can be used to determine whether the first terminal device can serve as a cooperative terminal device of the second terminal device.

[0093] In one possible implementation, the second reference signal may be a sidelink channel state information reference signal (SL CSI-RS). The network device may configure the SL CSI-RS for the second terminal device. For example, the network device may send first configuration information or indication information of the first configuration information to the second terminal device, where the first configuration information is used to indicate parameters for transmitting the SL CSI-RS so that the second terminal device sends the second reference signal. Subsequently, the second terminal device may forward the first configuration information or the first configuration information to the first terminal device so that the first terminal device receives the second reference signal sent by the second terminal device. The parameters for transmitting the SL CSI-RS may, for example, include the time-frequency resources occupied by the SL CSI-RS, etc.

[0094] In another possible implementation, the second reference signal may be a sounding reference signal (SRS). Normally, the SRS is sent by the second terminal device to the network device, and is used by the network device to measure the reference signal of the uplink channel, and the network device may configure the SRS for the second terminal device. In order to enable the first terminal device to also receive the SRS, in an embodiment of the present application, the network device may also notify the first terminal device of the SRS configured for the second terminal device. For example, the network device may send second configuration information or indication information of the second configuration information to the first terminal device and the second terminal device, and the second configuration information indicates the parameters used to transmit the SRS. The parameters for transmitting the SRS may include, for example, the time-frequency resources occupied by the SRS. Furthermore, the second configuration information may also include an identifier of the second terminal device, and the identifier of the second terminal device may be a cell radio network temporary identifier (C-RNTI) of the second terminal device, which is used by the first terminal device to identify that the SRS received according to the aforementioned second configuration information is from the second terminal device.

[0095] Step S204: The first terminal device receives a second reference signal from the second terminal device, and obtains a measurement value of the second reference signal.

[0096] The first terminal device may receive and measure a second reference signal from the second terminal device, and the measured value of the second reference signal may reflect the channel quality between the first terminal device and the second terminal device. Similarly, the measured value may be any one of RSRP, RSSI, RSSQ, and SINR. The higher the RSRP of the SL CSI-RS, the better the channel quality between the first terminal device and the second terminal device, and the same is true for RSSI, RSSQ, and SINR.

[0097] Step S205: The first terminal device determines a comprehensive channel quality parameter based on the measured value of the first reference signal and / or the measured value of the second reference signal, where the comprehensive channel quality parameter is used to determine at least one terminal device for collaborative transmission with the second terminal device.

[0098] The comprehensive channel quality parameter is a function of the measured value of the first reference signal and / or the measured value of the second reference signal, and therefore can reflect the comprehensive channel quality between the first terminal device and the network device, and between the first terminal device and the second terminal device. Determining the cooperative terminal device of the second terminal device based on the comprehensive channel quality parameter can ensure that both the cooperative terminal device and the network device and the second terminal device have good channel quality, thereby effectively improving the transmission performance of user collaboration.

[0099] In an embodiment of the present application, the network device may configure the functional relationship between the comprehensive channel quality parameter and the measured value of the first reference signal and the measured value of the second reference signal, so that the first terminal device can calculate the comprehensive channel quality parameter according to the functional relationship. For example, the network device may send fourth configuration information to the first terminal device, and the fourth configuration information is used to indicate the functional relationship between the comprehensive channel quality parameter and the measured value of the first reference signal and the measured value of the second reference signal. The fourth configuration information may be a physical layer configuration signaling or a medium access control layer control (medium access control, MAC) signaling, or a radio resource control (radio resource control, RRC) control signaling, which is not limited by the present application. The functional relationship between the comprehensive channel quality parameter and the measured value of the first reference signal and the measured value of the second reference signal may also be predefined in the communication system, which is also not limited by the present application.

[0100] If the comprehensive channel quality parameter is positively correlated with the measured value of the first reference signal and the measured value of the second reference signal, then the larger the comprehensive channel quality parameter determined by the first terminal device is, the more suitable the first terminal device is as a cooperative terminal device of the second terminal device. Conversely, if the comprehensive channel quality parameter is negatively correlated with the measured value of the first reference signal and the measured value of the second reference signal, then the smaller the comprehensive channel quality parameter determined by the first terminal device is, the more suitable the first terminal device is as a cooperative terminal device of the second terminal device.

[0101] In a specific example, the function may satisfy the following relationship: i =min{α i , S_α i}, or β i =(1-γ i )α i +γ i S_α i}, where β i is the comprehensive channel quality parameter, α i is the measured value of the first reference signal, S_α i is the measured value of the second reference signal, γ i is the weight and 0≤γ i ≤1.

[0102] Since the transmission power of the first reference signal sent by the network device and the transmission power of the second reference signal sent by the second terminal device may be different, in order to obtain a more accurate comprehensive channel quality parameter, the network device may notify the first terminal device of the difference between the transmission power of the first reference signal and the transmission power of the second reference signal. For example, the network device may send a first indication message to the first terminal device, and the first indication message indicates the difference between the transmission power of the first reference signal and the transmission power of the second reference signal. For another example, the network device may notify the first terminal device of the transmission power of the first reference signal, and the second terminal device may notify the first terminal device of the transmission power of the second reference signal, and the first terminal device may determine the difference between the transmission power of the first reference signal and the transmission power of the second reference signal by itself.

[0103] Furthermore, the first terminal device may correct the measured value of the first reference signal and the measured value of the second reference signal according to the difference between the transmit power of the first reference signal and the transmit power of the second reference signal, and then determine the comprehensive channel quality parameter according to the measured value of the first reference signal and the measured value of the second reference signal after correction. If the measured value of the first reference signal is η and the measured value of the second reference signal is η s , the difference between the transmit power of the first reference signal and the transmit power of the second reference signal is A, which means that the transmit power of the second reference signal is A less than the transmit power of the first reference signal. Then, after correction, the measured value of the first reference signal is η, and the measured value of the second reference signal is η s +A. The first terminal device can convert η and η s Substitute A into the above function relationship to obtain the comprehensive channel quality parameter.

[0104] In one possible design, the network device may configure corresponding thresholds for the measured value of the first reference signal, the measured value of the second reference signal, and the comprehensive channel quality parameter, respectively, wherein the threshold corresponding to the measured value of the first reference signal is the first threshold, the threshold corresponding to the measured value of the second reference signal is the second threshold, and the threshold corresponding to the comprehensive channel quality parameter is the third threshold. In the case where a larger measured value of the reference signal indicates better channel quality, and a larger comprehensive channel quality parameter indicates more suitable as a cooperative terminal device, the first terminal device may also determine that the measured value of the first reference signal is greater than or equal to the first threshold, and / or the measured value of the second reference signal is greater than or equal to the second threshold before sending the comprehensive channel quality parameter to the network device or the second terminal device; and\or, the first terminal device determines that the comprehensive channel quality parameter is greater than or equal to the third threshold.

[0105] That is, the first terminal device may send the comprehensive channel quality parameter to the network device or the second terminal device when the measured value of the first reference signal is greater than or equal to the first threshold, and the measured value of the second reference signal is greater than or equal to the second threshold. Alternatively, the first terminal device may send the comprehensive channel quality parameter to the network device or the second terminal device when the determined comprehensive channel quality parameter is greater than or equal to the third threshold. Alternatively, the first terminal device may send the comprehensive channel quality parameter to the network device or the second terminal device when the measured value of the first reference signal is greater than or equal to the first threshold, the measured value of the second reference signal is greater than or equal to the second threshold, and the determined comprehensive channel quality parameter is greater than or equal to the third threshold. Alternatively, the first terminal device may determine the comprehensive channel quality parameter according to the above functional relationship only when the measured value of the first reference signal is greater than or equal to the first threshold, and the measured value of the second reference signal is greater than or equal to the second threshold, otherwise the comprehensive channel quality parameter is not calculated, and the comprehensive channel quality parameter is not sent to the network device or the second terminal device.

[0106] It should be noted that, in the embodiment of the present application, the measured value may also be the path loss, but the path loss is negatively correlated with the channel quality. That is, the smaller the path loss of the CSI-RS, the better the channel quality between the first terminal device and the network device. In the case where the smaller the measured value of the reference signal, the better the channel quality, and the larger the comprehensive channel quality parameter, the more suitable it is as a collaborative terminal device, the first terminal device may also determine that the measured value of the first reference signal is less than or equal to the first threshold, and / or the measured value of the second reference signal is less than or equal to the second threshold before sending the comprehensive channel quality parameter to the network device or the second terminal device; and / or, the first terminal device determines that the comprehensive channel quality parameter is greater than or equal to the third threshold.

[0107] Step S206: The first terminal device sends the comprehensive channel quality parameter to the network device or the second terminal device.

[0108] The first terminal device may send the integrated channel quality parameter via physical layer signaling, or may send the integrated channel quality parameter via MAC layer signaling or RRC layer signaling, which is not limited in this application. Moreover, any indication information or any configuration process involved in the embodiments of this application may be sent or configured via physical layer signaling, MAC layer signaling or RRC layer signaling, which will not be described in detail below.

[0109] As mentioned above, the second terminal device is a TUE, and the first terminal device is a potential CUE of the second terminal device. Figure 3 As shown in FIG. 1 , there may be multiple potential cooperative terminal devices CUE around TUE, such as Figure 3Each potential CUE can be used as the first terminal device. Figure 2 The method shown in receives CSI-RS from a network device, receives SL CSI-RS from a TUE, and then calculates a comprehensive channel quality parameter based on the measured RSRP of the CSI-RS and the RSRP of the SLCSI-RS, and sends the comprehensive channel quality parameter to the network device or the second terminal device.

[0110] The network device can select the final CUE from one or more potential CUEs for the TUE, and the TUE itself can also select the final CUE from one or more potential CUEs. Therefore, in step S206, the comprehensive channel quality parameter determined by the first terminal device can be sent to the network device or to the second terminal device.

[0111] It can also be understood that, for each potential CUE, taking the first terminal device as an example, the network device can decide whether the first terminal device can serve as the CUE of the TUE, or the TUE can decide whether the first terminal device can serve as its own CUE. Therefore, the network device can send second indication information to each potential CUE, indicating in the second indication information whether to send the comprehensive channel quality parameter to the network device or to the TUE.

[0112] For example, if the network device is responsible for deciding whether each potential CUE can be used as the CUE of the TUE, then each potential CUE can send a comprehensive channel quality parameter to the network device, and then the network device selects one or more CUEs from each potential CUE based on the comprehensive channel quality parameter of each potential CUE and the number of CUEs that need to be determined. If the larger the value of the comprehensive channel quality parameter, the better the channel quality between the potential CUE and the network device and the TUE, and the network device needs to select n final CUEs, then the network device can select the first n UEs with larger comprehensive channel quality parameters from each potential CUE as the final CUE.

[0113] See also Figure 4, which is an example of a collaborative transmission process when the first reference signal is CSI-RS and the second reference signal is SL CSI-RS. In this example, the network device can configure CSI-RS resources for the first terminal device, and the functional relationship for the first terminal device to calculate the comprehensive channel quality parameter. The network device can also configure resources for sending SLCSI-RS for the second terminal device. Furthermore, the network device sends CSI-RS to the first terminal device, the second terminal device sends SL CSI-RS to the first terminal device, and the first terminal device determines and sends the comprehensive channel quality parameter to the network device based on the functional relationship configured by the network device.

[0114] See also Figure 5 , which is an example of a collaborative transmission process when the first reference signal is CSI-RS and the second reference signal is SRS. In this example, the network device can configure SRS for the second terminal device, the network device can configure CSI-RS for the first terminal device, configure a function of comprehensive channel quality parameters for the first terminal device, and send the configuration of the SRS of the second terminal device to the first terminal device. This enables the first terminal device to intercept the SRS sent by the second terminal device to the network device, and determine the channel quality between the first terminal device and the second terminal device based on the SRS sent by the intercepted second terminal device. Furthermore, the network device sends CSI-RS to the first terminal device, the second terminal device sends SRS to the network device, and the first terminal device listens to the SRS sent by the second terminal device based on the SRS configuration of the second terminal device sent by the network device, thereby determining and sending the comprehensive channel quality parameter to the network device.

[0115] It should be noted that the embodiment of the present application does not specifically limit the order in which the first terminal device receives the first reference signal from the network device and the first terminal device receives the second reference signal from the second terminal device. The first terminal device may first receive and measure the first reference signal to obtain a measurement value of the first reference signal, or may first receive and measure the second reference signal to obtain a measurement value of the second reference signal.

[0116] In a possible design, the first terminal device may also directly send the measured value of the first reference signal and / or the measured value of the second reference signal obtained in step S202 and step S204 to the network device or the second terminal device, and the network device or the second terminal device may determine the comprehensive channel quality parameter by itself in the above manner, and then determine the cooperative terminal device of the second terminal device. It can be understood that the second indication information may also be used to indicate whether the first terminal device sends the measured value of the first reference signal and / or the measured value of the second reference signal to the network device or to the second terminal device, thereby reducing the processing load of the first terminal device and improving the efficiency of cooperative transmission.

[0117] By adopting the technical solution provided in the embodiment of the present application, the first terminal device can send a comprehensive channel quality parameter to the network device or the second terminal device, and the network device or the second terminal device determines at least one terminal device for cooperative transmission with the second terminal device according to the comprehensive channel quality parameter. Since the comprehensive channel quality parameter is determined based on the measured value of the first reference signal sent by the network device and the measured value of the second reference signal sent by the second terminal device, it is possible to consider two factors, namely, the channel quality between the first terminal device and the network device and the channel quality between the first terminal device and the second terminal device, to determine the cooperative terminal device of the second terminal device, thereby improving the effectiveness of the selection of the cooperative terminal device and enhancing the transmission performance and reliability of the second terminal device.

[0118] The present application provides a communication device, please refer to Figure 6 , is a structural diagram of a communication device provided in an embodiment of the present application, the communication device 600 includes: a transceiver module 610 and a processing module 620. The communication device can be used to implement the functions of the first terminal device or the second terminal device involved in any of the above method embodiments. For example, the communication device can be a terminal device, such as a handheld terminal device or a vehicle-mounted terminal device; the communication device can be a chip included in the terminal device, or a device including the terminal device, such as various types of vehicles; the communication device can also be other combined devices, components, etc. with the functions of the above terminal devices. When the communication device is a terminal device, the transceiver module can be a transceiver, which can include an antenna and a radio frequency circuit, etc., and the processing module can be a processor, such as a central processing unit (CPU). When the communication device is a component with the functions of the above terminal device, the transceiver module can be a radio frequency unit, and the processing module can be a processor. When the communication device is a chip system, the transceiver module can be an input and output interface of the chip system, and the processing module can be a processor of the chip system.

[0119] When the communication device is used as the first terminal device, executing Figure 2 In the method embodiment shown in , the transceiver module 610 is used to perform operations of receiving a first reference signal from a network device to obtain a measurement value of the first reference signal, and receiving a second reference signal from a second terminal device to obtain a measurement value of the second reference signal; the processing module 620 is used to perform operations of determining a comprehensive channel quality parameter based on the measurement value of the first reference signal and / or the measurement value of the second reference signal.

[0120] When the communication device is used as the second terminal device, executing Figure 2In the method embodiment shown in , the transceiver module 610 is used to execute the operation of sending a second reference signal to the first terminal device and receiving the comprehensive channel quality parameter sent by the first terminal device; the processing module 620 is used to execute the operation of determining whether the first terminal device can be a cooperative terminal device of the second terminal device based on the received comprehensive channel quality parameter.

[0121] The processing module 620 involved in the communication device can be implemented by a processor or a processor-related circuit component, and the transceiver module 610 can be implemented by a transceiver or a transceiver-related circuit component. The operations and / or functions of each module in the communication device are respectively to achieve Figure 2 , Figure 3 , Figure 4 The corresponding process of the method shown in Figure 2 In the embodiment, if the communication device is the first terminal device, the transceiver module 610 can be used to execute step S202, step S203 and step S206, and the processing module 610 can be used to execute step S205. For the sake of brevity, they are not listed one by one here.

[0122] Please refer to Figure 7 , is another structural diagram of a communication device provided in an embodiment of the present application. The communication device may be a terminal device. For ease of understanding and illustration, Figure 7 In the example, a mobile phone is used as the terminal device. Figure 7 As shown, the terminal device includes a processor and may also include a memory. Of course, it may also include a radio frequency circuit, an antenna, and input and output devices. The processor is mainly used to process communication protocols and communication data, as well as to control the terminal device, execute software programs, and process software program data. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.

[0123] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Figure 7Only one memory and processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device. The memory may be set independently of the processor or may be integrated with the processor, and the embodiments of the present application do not limit this.

[0124] In the embodiments of the present application, the antenna and the radio frequency circuit having transceiver functions may be regarded as the transceiver unit of the terminal device, and the processor having the processing function may be regarded as the processing unit of the terminal device. Figure 7 As shown, the terminal device includes a transceiver unit 710 and a processing unit 720. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. The processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, the device used to implement the receiving function in the transceiver unit 710 may be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 710 may be regarded as a sending unit, that is, the transceiver unit 710 includes a receiving unit and a sending unit. The transceiver unit may sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit, etc. The receiving unit may sometimes be referred to as a receiver, a receiver, or a receiving circuit, etc. The sending unit may sometimes be referred to as a transmitter, a transmitter, or a transmitting circuit, etc. It should be understood that the transceiver unit 710 is used to perform the sending operation and the receiving operation on the terminal device side in the above method embodiment, and the processing unit 720 is used to perform other operations on the terminal device in addition to the sending operation in the above method embodiment.

[0125] The present application embodiment also provides another communication device, please refer to Figure 8 , is a structural diagram of another communication device provided in an embodiment of the present application, and the communication device 800 includes: a transceiver module 810 and a processing module 820. The communication device can be used to implement the functions of the network device involved in any of the above method embodiments. For example, the communication device can be a network device or a chip included in the network device, and the communication device can also be other combined devices, components, etc. with the functions of the above network devices. When the communication device is a network device, the transceiver module can be a transceiver, which can include an antenna and a radio frequency circuit, etc., and the processing module can be a processor, such as a central processing unit (CPU). When the communication device is a component with the functions of the above network device, the transceiver module can be a radio frequency unit, and the processing module can be a processor. When the communication device is a chip system, the transceiver module can be the input and output interface of the chip system, and the processing module can be the processor of the chip system.

[0126] When the communication device is used as a network device, executing Figure 2In the method embodiment shown in , the transceiver module 810 is used to execute the operation of sending a second reference signal to the first terminal device and receiving the comprehensive channel quality parameter sent by the first terminal device; the processing module 820 is used to determine whether the first terminal device can be a cooperative terminal device of the second terminal device based on the received comprehensive channel quality parameter.

[0127] It should be understood that the processing module 820 involved in the communication device can be implemented by a processor or a processor-related circuit component, and the transceiver module 810 can be implemented by a transceiver or a transceiver-related circuit component. The operations and / or functions of each module in the communication device are respectively to achieve Figure 2 , Figure 3 and Figure 4 The corresponding process of the method shown in Figure 2 In the embodiment, the communication device serves as a network device, and the transceiver module 810 can be used to execute step S201 and step S206, which are not listed one by one here for the sake of brevity.

[0128] Please refer to Fig. 9 1 is another structural diagram of another communication device provided in an embodiment of the present application. The communication device may be specifically a network device, such as a base station, for implementing the functions of the network device involved in any of the above method embodiments.

[0129] The network device 900 includes: one or more radio frequency units, such as a remote radio unit (RRU) 901 and one or more baseband units (BBU) (also called digital unit, digital unit, DU) 902. The RRU 901 can be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 9011 and a radio frequency unit 9012. The RRU 901 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals. The BBU 902 part is mainly used for baseband processing, controlling the base station, etc. The RRU 901 and BBU 902 can be physically set together or physically separated, that is, a distributed base station.

[0130] The BBU 902 is the control center of the base station, which can also be called a processing unit, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU (processing unit) 902 can be used to control the base station to execute the operation process of the network device in the above method embodiment.

[0131] In one example, the BBU 902 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network with a single access indication (such as an LTE network), or may respectively support wireless access networks with different access standards (such as an LTE network, a 5G network, or other networks). The BBU 902 may also include a memory 9021 and a processor 9022, and the memory 9021 is used to store necessary instructions and data. The processor 9022 is used to control the base station to perform necessary actions, for example, to control the base station to perform the sending operation in the above method embodiment. The memory 9021 and the processor 9022 may serve one or more single boards. In other words, a memory and a processor may be separately set on each single board. It is also possible that multiple single boards share the same memory and processor. In addition, necessary circuits may be set on each single board.

[0132] An embodiment of the present application also provides a chip system, including: a processor, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the chip system implements the method in any of the above method embodiments.

[0133] Optionally, the processor in the chip system may be one or more. The processor may be implemented by hardware or by software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc. When implemented by software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

[0134] Optionally, the memory in the chip system may be one or more. The memory may be integrated with the processor or may be separately provided with the processor, which is not limited in the present application. Exemplarily, the memory may be a non-transient processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip or may be provided on different chips. The present application does not specifically limit the type of memory and the arrangement of the memory and the processor.

[0135] Exemplarily, the chip system can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD) or other integrated chips.

[0136] It should be understood that each step in the above method embodiment can be completed by an integrated logic circuit of hardware in a processor or by instructions in the form of software. The method steps disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware processor, or by a combination of hardware and software modules in a processor.

[0137] An embodiment of the present application further provides a computer-readable storage medium, in which computer-readable instructions are stored. When a computer reads and executes the computer-readable instructions, the computer executes a method in any of the above method embodiments.

[0138] The embodiment of the present application also provides a computer program product. When a computer reads and executes the computer program product, the computer executes the method in any of the above method embodiments.

[0139] An embodiment of the present application also provides a communication system, which includes a network device and at least one terminal device.

[0140] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0141] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0142] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor.

[0143] It should be noted that the memory described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0144] It should be understood that in various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0145] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0146] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0147] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments 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, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0148] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0149] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0150] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0151] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A collaborative transmission method, characterized in that: The method comprises: The first terminal device receives a first reference signal from the network device, and obtains a measurement value of the first reference signal; The first terminal device receives a second reference signal from the second terminal device, and obtains a measurement value of the second reference signal; The first terminal device determines a comprehensive channel quality parameter according to the measured value of the first reference signal and the measured value of the second reference signal, wherein the comprehensive channel quality parameter is used to determine at least one terminal device for cooperative transmission with the second terminal device; The first terminal device sends the integrated channel quality parameter to the network device or the second terminal device; The method further comprises: The first terminal device receives first indication information from the network device, where the first indication information indicates a difference between a transmit power of the first reference signal and a transmit power of the second reference signal; The first terminal device determines a comprehensive channel quality parameter according to a measurement value of the first reference signal and a measurement value of the second reference signal, including: The first terminal device determines the comprehensive channel quality parameter based on the measurement value of the first reference signal, the measurement value of the second reference signal and the difference.

2. The method according to claim 1, characterized in that: The second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method further includes: The first terminal device receives first configuration information or indication information of the first configuration information from the second terminal device, where the first configuration information indicates parameters for transmitting the SL CSI-RS; The first terminal device receiving a second reference signal from a second terminal device includes: The first terminal device receives the SL CSI-RS according to the first configuration information.

3. The method according to claim 1, characterized in that The first reference signal is a channel state information reference signal CSI-RS; the method further includes: The first terminal device receives third configuration information or indication information of the third configuration information from the network device, where the third configuration information indicates parameters used to transmit the CSI-RS; The first terminal device receiving a first reference signal from the network device includes: The first terminal device receives the CSI-RS according to the third configuration information.

4. The method according to any one of claims 1 to 3, characterized in that The integrated channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal; The first terminal device determines the comprehensive channel quality parameter, including: The first terminal device determines the comprehensive channel quality parameter based on the measured value of the first reference signal, the measured value of the second reference signal and the function.

5. The method according to any one of claims 1 to 3, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

6. A collaborative transmission method, characterized in that: The method comprises: The network device sends a first reference signal to the first terminal device; The network device receives a comprehensive channel quality parameter from the first terminal device, where the comprehensive channel quality parameter is determined by the first terminal device according to a measured value of the first reference signal and a measured value of a second reference signal and a difference between a transmit power of the first reference signal and a transmit power of the second reference signal, where the second reference signal is a reference signal received by the first terminal device from a second terminal device; The network device determines, according to the comprehensive channel quality parameter, at least one terminal device for collaborative transmission with the second terminal device; The method further comprises: The network device sends first indication information to the first terminal device, where the first indication information is used to indicate a difference between a transmit power of the first reference signal and a transmit power of the second reference signal.

7. The method according to claim 6, characterized in that The second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method further includes: The network device sends first configuration information or indication information of the first configuration information to the second terminal device, where the first configuration information indicates parameters used to transmit the SL CSI-RS.

8. The method according to claim 6, characterized in that The first reference signal is a channel state information reference signal CSI-RS; the method further includes: The network device sends third configuration information or indication information of the third configuration information to the first terminal device, where the third configuration information indicates parameters used to transmit the CSI-RS.

9. The method according to any one of claims 6 to 8, characterized in that The composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

10. The method according to any one of claims 6 to 8, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

11. A collaborative transmission method, characterized in that: The method comprises: The second terminal device sends a second reference signal to the first terminal device; The second terminal device receives a comprehensive channel quality parameter from the first terminal device, where the comprehensive channel quality parameter is determined by the first terminal device according to a measured value of a first reference signal and a measured value of the second reference signal and a difference between a transmit power of the first reference signal and a transmit power of the second reference signal, wherein the first reference signal is a reference signal received by the first terminal device from a network device; The second terminal device determines at least one terminal device for collaborative transmission with the second terminal device based on the comprehensive channel quality parameter.

12. The method according to claim 11, characterized in that The second reference signal is a sidelink channel state information reference signal SL CSI-RS; the method further includes: The second terminal device receives first configuration information or indication information of the first configuration information from the network device, where the first configuration information indicates parameters used to transmit the SL CSI-RS.

13. The method according to claim 11, characterized in that The first reference signal is a channel state information reference signal CSI-RS.

14. The method according to any one of claims 11 to 13, characterized in that The composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

15. The method according to any one of claims 11 to 13, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

16. A communication device, characterized in that: The device comprises: A transceiver module, configured to receive a first reference signal from a network device and obtain a measurement value of the first reference signal; The transceiver module is further used to receive a second reference signal from a second terminal device to obtain a measurement value of the second reference signal; a processing module, configured to determine a comprehensive channel quality parameter according to a measurement value of the first reference signal and a measurement value of the second reference signal, wherein the comprehensive channel quality parameter is used to determine at least one terminal device for cooperative transmission with the second terminal device; The transceiver module is further used to send the comprehensive channel quality parameter to the network device or the second terminal device; The transceiver module is also used for: receiving first indication information from the network device, where the first indication information indicates a difference between a transmit power of the first reference signal and a transmit power of the second reference signal; The processing module is specifically used for: The comprehensive channel quality parameter is determined according to the measured value of the first reference signal, the measured value of the second reference signal and the difference.

17. The device according to claim 16, characterized in that The second reference signal is a sidelink channel state information reference signal SL CSI-RS; The transceiver module is further used to receive first configuration information or indication information of the first configuration information from the second terminal device, where the first configuration information indicates parameters for transmitting the SL CSI-RS; The SL CSI-RS is received according to the first configuration information.

18. The device according to claim 16, characterized in that The first reference signal is a channel state information reference signal CSI-RS; The transceiver module is further used to receive third configuration information or indication information of the third configuration information from the network device, where the third configuration information indicates parameters used to transmit the CSI-RS; The CSI-RS is received according to the third configuration information.

19. The device according to any one of claims 16 to 18, characterized in that The integrated channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal; The processing module is specifically used for: The comprehensive channel quality parameter is determined according to the measured value of the first reference signal, the measured value of the second reference signal and the function.

20. The device according to any one of claims 16 to 18, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

21. A communication device, characterized in that: The device comprises: A transceiver module, used to send a first reference signal to a first terminal device; The transceiver module is further configured to receive a comprehensive channel quality parameter from the first terminal device, where the comprehensive channel quality parameter is determined by the first terminal device according to a measured value of the first reference signal and a measured value of a second reference signal and a difference between a transmit power of the first reference signal and a transmit power of the second reference signal, where the second reference signal is a reference signal received by the first terminal device from a second terminal device; A processing module, configured to determine, according to the comprehensive channel quality parameter, at least one terminal device for cooperative transmission with the second terminal device; The transceiver module is also used for: First indication information is sent to the first terminal device, where the first indication information is used to indicate a difference between a transmit power of the first reference signal and a transmit power of the second reference signal.

22. The device according to claim 21, characterized in that The second reference signal is a sidelink channel state information reference signal SL CSI-RS; The transceiver module is also used for: Send first configuration information or indication information of the first configuration information to the second terminal device, where the first configuration information indicates parameters used to transmit the SL CSI-RS.

23. The device according to claim 21, characterized in that The first reference signal is a channel state information reference signal CSI-RS; The transceiver module is also used for: Send third configuration information or indication information of the third configuration information to the first terminal device, wherein the third configuration information indicates parameters used to transmit the CSI-RS.

24. The device according to any one of claims 21 to 23, characterized in that The composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

25. The device according to any one of claims 21 to 23, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

26. A communication device, characterized in that: The device comprises: A transceiver module, used to send a second reference signal to the first terminal device; The transceiver module is further configured to receive a comprehensive channel quality parameter from the first terminal device, where the comprehensive channel quality parameter is determined by the first terminal device according to a measured value of a first reference signal and a measured value of the second reference signal and a difference between a transmit power of the first reference signal and a transmit power of the second reference signal, wherein the first reference signal is a reference signal received by the first terminal device from a network device; A processing module is used to determine at least one terminal device for cooperative transmission with the communication device based on the comprehensive channel quality parameter.

27. The device according to claim 26, characterized in that The second reference signal is a sidelink channel state information reference signal SL CSI-RS; The transceiver module is also used for: First configuration information or indication information of the first configuration information is received from the network device, where the first configuration information indicates parameters used to transmit the SL CSI-RS.

28. The device according to claim 26, characterized in that The first reference signal is a channel state information reference signal CSI-RS.

29. The device according to any one of claims 26 to 28, characterized in that The composite channel quality parameter is a function of a measured value of the first reference signal and a measured value of the second reference signal.

30. The device according to any one of claims 26 to 28, characterized in that The measurement value is any one of a reference signal received power RSRP, a received signal strength indicator RSSI, a reference signal received quality RSSQ, and a channel to noise and interference ratio SINR.

31. A communication device, characterized in that: The apparatus comprises at least one processor coupled to at least one memory: The at least one processor is used to execute a computer program or instruction stored in the at least one memory so that the device performs the method as described in any one of claims 1 to 5, or the method as described in any one of claims 6 to 10, or the method as described in any one of claims 11 to 15.

32. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or instructions. When a computer reads and executes the computer program or instructions, the computer executes the method as described in any one of claims 1 to 5, or executes the method as described in any one of claims 6 to 10, or executes the method as described in any one of claims 11 to 15.

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