Communication method, terminal, communication device and network device

Abstract

The invention provides a communication method, a terminal, communication equipment and network equipment. The communication method comprises the following steps: a first terminal receives first information; wherein the first information is used for indicating first link information between the second communication equipment and the third terminal. When the first terminal performs relay selection or reselection, the first link information may facilitate the first terminal to determine whether to select the second communication device as a relay device from the first terminal to the second terminal. Namely, when the first terminal selects the relay equipment, the link condition between the candidate relay equipment and the target remote terminal can be considered, so that the link between the relay equipment and the target remote terminal is prevented from causing service forwarding failure of sidewalk communication.

Description

Communication methods, terminals, communication equipment, and network equipment Technical Field This application relates to the field of communication technology, and more specifically, to a communication method, terminal, communication device, and network device. Background Technology In terminal-to-terminal relaying, a relay selection process is required to choose a suitable relay device (e.g., a relay terminal). In related technologies, the source and remote terminals can determine whether to select a device as a relay based on the link quality between the source / remote terminal and a candidate relay device. However, based on this method, if the link between the selected relay device and the target remote terminal is abnormal (e.g., poor link quality), it may lead to service forwarding failure. Summary of the Invention This application provides a communication method, a terminal, a communication device, and a network device. This application will be described in terms of the following aspects. In a first aspect, a communication method is provided, the communication method comprising: a first terminal receiving first information; wherein the first information is used to indicate first link information between a second communication device and a third terminal. In a second aspect, a communication method is provided, the communication method comprising: a second communication device sending first information to a first terminal; wherein the first information is used to indicate first link information between the second communication device and a third terminal. Thirdly, a communication method is provided, the communication method comprising: a third terminal acquiring first link information between the third terminal and a second communication device; wherein the first link information is used by a first terminal to determine whether the second communication device is a relay terminal. Fourthly, a communication method is provided, the communication method comprising: a network device sending third information to a first terminal; wherein the third information is used to indicate first configuration information, and whether to select a second communication device as a relay terminal is determined based on the first configuration information and first link information, the first link information being the link information between the second communication device and the third terminal. Fifthly, a terminal is provided, the terminal being a first terminal, the terminal comprising: a first receiving unit for receiving first information; wherein the first information is used to indicate first link information between a second communication device and a third terminal. In a sixth aspect, a communication device is provided, the communication device being a second communication device, the terminal comprising: a first transmitting unit, configured to transmit first information to a first terminal; wherein the first information is configured to indicate first link information between the second communication device and a third terminal. In a seventh aspect, a terminal is provided, the terminal being a third terminal, the terminal comprising: a first acquisition unit, configured to acquire first link information between the third terminal and a second communication device; wherein the first link information is used by the first terminal to determine whether the second communication device is a relay terminal. Eighthly, a network device is provided, the network device comprising: a third transmitting unit, configured to transmit third information to a first terminal; wherein the third information is configured to indicate first configuration information, and whether to select a second communication device as a relay terminal is determined based on the first configuration information and first link information, the first link information being information about the link between the second communication device and the third terminal. A ninth aspect provides a terminal device, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the terminal device to execute the method described in the first aspect or the third aspect. In a tenth aspect, a communication device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the terminal device to execute the method described in the second aspect. Eleventhly, a network device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the network device to perform the method of the fourth aspect. In a twelfth aspect, embodiments of this application provide a communication system that includes at least one of the terminal device, communication device, and network device described above. In another possible design, the system may further include other devices that interact with the terminal, communication device, or network device as provided in the embodiments of this application. In a thirteenth aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a terminal device to perform some or all of the steps in the methods described in the first or third aspects above. In a fourteenth aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a terminal device to perform some or all of the steps in the method described in the second aspect. In a fifteenth aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a network device to perform some or all of the steps in the method described in the fourth aspect. In a sixteenth aspect, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a terminal to perform some or all of the steps in the methods of the first or third aspect described above. In some implementations, the computer program product may be a software installation package. In a seventeenth aspect, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a terminal to perform some or all of the steps in the method of the second aspect described above. In some implementations, the computer program product may be a software installation package. In an eighteenth aspect, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a network device to perform some or all of the steps in the method of the fourth aspect described above. In some implementations, the computer program product may be a software installation package. In a nineteenth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to call and run a computer program from the memory to implement some or all of the steps described in the methods of the first, second, third, or fourth aspects above. In a twentieth aspect, a computer program product is provided, comprising a program that causes a computer to perform the methods described in the first, second, or third aspects. In a twentieth aspect, a computer program product is provided, comprising a program that causes a computer to perform the method described in the fourth aspect. In a twenty-second aspect, a computer program is provided that causes a computer to perform the methods described in the first, second, or third aspect. In a twentieth aspect, a computer program is provided that causes a computer to perform the method described in the fourth aspect. When the first terminal performs relay selection or reselection, the first link information can help the first terminal determine whether to select the second communication device as the relay device from the first terminal to the second terminal. In other words, when selecting a relay device, the first terminal can consider the link situation between the candidate relay device and the target remote terminal, thereby preventing the link between the relay device and the target remote terminal from causing the service forwarding failure of the side-by-side communication. Attached Figure Description Figure 1 shows the wireless communication system 100 used in an embodiment of this application. Figure 2 shows an example of a side-to-side communication scenario within network coverage. Figure 3 shows an example of a side-by-side communication scenario with partial network coverage. Figure 4 shows an example of a scenario for side-to-side communication outside network coverage. Figure 5 shows an example of a terminal-to-terminal relay scenario. Figure 6 is a schematic flowchart of a communication method provided in an embodiment of this application. Figure 7 is a schematic flowchart of another communication method provided in an embodiment of this application. Figure 8 is a schematic flowchart of another communication method provided in an embodiment of this application. Figure 9 is a schematic flowchart of another communication method provided in an embodiment of this application. Figure 10 is a schematic diagram of a scenario applicable to the embodiments of this application. Figure 11 is a schematic structural diagram of a terminal provided in an embodiment of this application. Figure 12 is a schematic structural diagram of a communication device provided in an embodiment of this application. Figure 13 is a schematic structural diagram of another terminal provided in an embodiment of this application. Figure 14 is a schematic structural diagram of a network device provided in an embodiment of this application. Figure 15 is a schematic structural diagram of a communication device provided in an embodiment of this application. Detailed Implementation The technical solutions in this application will now be described with reference to the accompanying drawings. Communication system Figure 1 illustrates a wireless communication system 100 according to an embodiment of this application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographical area and may communicate with the terminal device 120 located within that coverage area. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other terminal devices within its coverage area; this application embodiment does not limit this. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment. It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, satellite communication systems, and so on. The terminal device in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in this application embodiment can be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, smart homes, etc. Optionally, the terminal device can act as a base station. For example, the terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices can communicate without relaying communication signals through base stations. Optionally, the terminal device can be used to act as a base station. The network device in this application embodiment can be a device for communicating with a terminal device. This network device can also be called an access network device or a wireless access network device, such as a base station. In this application embodiment, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master MeNB, secondary SeNB, multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. Base stations can also be mobile switching centers, devices that perform base station functions in D2D, vehicle-to-vehicle (V2V), V2X, and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or device forms used in the network equipment. Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station. In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU. Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located. It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform). Side-to-side communication under different network coverage conditions Sidelink communication refers to communication technology based on sidelinks. Sidelink communication supports direct data transmission between terminal devices. Direct data transmission between terminal devices can achieve higher spectral efficiency and lower transmission latency. For example, vehicle-to-everything (V2X) systems employ sidelink communication technology. In side-by-side communication, depending on the network coverage of the terminal device, side-by-side communication can be divided into side-by-side communication within network coverage, side-by-side communication with partial network coverage, and side-by-side communication outside network coverage. Figure 2 illustrates a scenario of lateral communication within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage area of ​​network device 110. Therefore, both terminal devices 120a can receive configuration signaling from network device 110 (configuration signaling in this application can also be replaced with configuration information), and determine the lateral configuration based on the configuration signaling from network device 110. After both terminal devices 120a have performed lateral configuration, lateral communication can be performed on the lateral link. Figure 3 illustrates a scenario of sidelink communication within partial network coverage. In the scenario shown in Figure 3, terminal device 120a and terminal device 120b engage in sidelink communication. Terminal device 120a is located within the coverage area of ​​network device 110, therefore it can receive configuration signaling from network device 110 and determine its sidelink configuration based on this signaling. Terminal device 120b is located outside the network coverage area and cannot receive configuration signaling from network device 110. In this case, terminal device 120b can determine its sidelink configuration based on pre-configuration information and / or information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a, which is located within the network coverage area. After both terminal devices 120a and 120b have performed sidelink configuration, sidelink communication can then commence on the sidelink link. Figure 4 illustrates a scenario of lateral communication outside network coverage. In the scenario shown in Figure 4, both terminal devices 120b are located outside network coverage. In this case, both terminal devices 120b can determine their lateral configuration based on pre-configuration information. After both terminal devices 120b have performed lateral configuration, lateral communication can be performed on the lateral link. D2D D2D can be implemented based on side-by-side communication. The research phases of D2D can include proximity-based services (ProSe), V2X, wearable devices (further enhancements to LTE device-to-device, FeD2D), and multi-carrier communication. These will be discussed in detail below. In some communication protocols (such as the 3rd Generation Partnership Project (3GPP) Rel-12 / 13), ProSe scenarios have been studied, with ProSe primarily targeting public safety services. In ProSe, by configuring the time-domain position of the resource pool (e.g., making the resource pool discontinuous in the time domain), the terminal can send and / or receive data discontinuously on the sidelink, thereby achieving power saving. In some communication protocols (such as 3GPP Rel-14 / 15), V2X has been studied for vehicle-to-vehicle communication scenarios, mainly targeting vehicle-to-vehicle and vehicle-to-person communication services that are moving at relatively high speeds. In V2X, since the on-board system has a continuous power supply, power efficiency is not the main issue; rather, data transmission latency is the primary concern. Therefore, the system design requires terminal devices to perform continuous sending and receiving. In some communication protocols (such as 3GPP Rel-14), the FeD2D scenario has been studied for wearable devices accessing the network via mobile phones, primarily targeting scenarios with low mobility and low power access. In FeD2D, the base station can configure the discontinuous reception (DRX) parameters of remote terminals through a relay terminal. In some communication protocols (such as 3GPP Rel-15), a multi-carrier mechanism has been introduced. This mechanism manifests in the following ways: terminals can support packet segmentation, transmitting packets using multiple carriers to improve data transmission rates; terminals can support packet duplication, copying an identical packet twice and transmitting it on two carriers to improve transmission reliability; and the receiving end experiences enhanced multi-carrier reception. Regarding packet duplication: V2X sidelink communication supports sidelink packet duplication, which is executed at the terminal's Packet Data Convergence Protocol (PDCP) layer. For sidelink packet duplication used for transmission, PDCP protocol data units (PDUs) can be duplicated at the PDCP entity. Duplicate PDCP PDUs from the same PDCP entity can be submitted to two different radio link control (RLC) entities and associated with two different sidelink logical channels. Duplicate PDCP PDUs from the same PDCP entity are only allowed to be transmitted on different sidelink carriers. Terminals can activate or deactivate sidelink packet duplication based on (pre)configuration. Sidechain packet replication is not applicable to devices with certain transport profiles (e.g., TS 23.285 for Rel-14).

[0072] The transmission of data using this method is described. The proseper-packet reliability (PPPR) value for near-field service supporting sidechain packet replication can be (pre-)configured via a PPPR threshold. For terminal-autonomous resource selection and scheduling, the terminal should perform sidechain packet replication on data with configured PPPR values ​​until packet replication configuration for those PPPR values ​​is deconfigured. For scheduled resource allocation, the terminal can associate the amount of data and the destination of the data with one or more PPPR values ​​via a sidechain buffer status report (BSR). The mapping of PPPR values ​​to logical channel groups can be configured by the network device, and the PPPR values ​​are reflected by the associated logical channel group IDs included in the sidechain BSR. A list of one or more PPPR values ​​can be reported by a terminal connected via radio resource control (RRC) in the sidechain terminal information. Side-line communication mode Some standards or protocols (such as 3GPP standards) define two modes of side-by-side communication (or transmission modes): mode 1 (or mode A) and mode 2 (or mode B). In the first mode, the resources for the terminal device are allocated by the network device. The terminal device can transmit data on the downlink according to the resources allocated by the network device. The network device can allocate resources for a single transmission or for semi-static transmission. For example, in the scenario shown in Figure 2, the network device can grant resources to the terminal device 120a through the downlink (DL). In the second mode, the terminal device can autonomously select one or more resources from the resource pool (RP). Then, the terminal device can perform side-going transmission based on the selected resources. For example, in the scenario shown in Figure 4, terminal device 120b is located outside the cell coverage area. Therefore, terminal device 120b can autonomously select resources from the pre-configured resource pool for side-going transmission. Alternatively, in the scenario shown in Figure 2, terminal device 120a can also autonomously select resources from the resource pool configured by network device 110 for side-going transmission. Optionally, in some communication systems (e.g., NR systems), the terminal can be in a hybrid mode. In hybrid mode, the terminal can acquire resources using either a first mode or a second mode. This resource acquisition can be indicated through sidelink grants, specifically by indicating the time-frequency location of the corresponding physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) resources. UE-to-UE relay In some communication protocols (such as Rel-18), research on end-to-end relay is part of the study of sidelinks. Terminal-to-terminal relay can extend the coverage of side-by-side communication between terminals and also save power. The device that implements terminal-to-terminal relay can be called a relay device. The relay device can be a terminal, in which case it can be called a relay UE. A relay UE can act as a relay between a source UE and a destination UE. Once a PC5 link is established between the source terminal, the relay terminal, and the target terminal, data relay can be performed between the source terminal and the target terminal. The coverage scenarios for terminal-to-terminal relays can include the following situations: 1) All terminals (including source remote terminals, target remote terminals, and relay terminals) are within the coverage area; 2) All terminals (including source remote terminals, target remote terminals, and relay terminals) are outside the coverage area; 3) In the case of partial coverage, at least one terminal (including the source remote terminal, the target remote terminal and the relay terminal) is within the coverage area, and at least one terminal is outside the coverage area. Some communication standards organizations (such as RAN2) are dedicated to providing universal solutions for both in-coverage and out-of-coverage scenarios. For terminal-to-terminal relays, it is possible to support scenarios where the terminal is covered by different cells. Figure 5 is an example of a terminal-to-terminal relay scenario. The scenario shown in Figure 5 may include a source remote terminal 510, a target remote terminal 520, and a relay terminal 530. In Figure 5, the coverage area can be defined as the source remote terminal 510, the target remote terminal 520, and / or the relay terminal being within the coverage area and able to access the network on Uu. In some communication systems (such as NR systems), a sidelink may include a PC5 link between one or more remote UEs and a relay terminal. The remote UE may include a source remote UE and a target remote UE. In some cases, the Cross-RAT configuration or control of the source remote terminal, relay terminal, and destination remote terminal can be disregarded; that is, network devices (eNB / ng-eNB) may not need to control or configure the source remote terminal, relay terminal, and destination remote terminal. In some cases, it can be assumed that the remote terminal has an active end-to-end connection through only a single relay terminal at a given time. It should be noted that there are no restrictions on the RRC status of terminals participating in terminal-to-terminal relays. The service continuity requirement applies only to terminal-to-network relays, not to terminal-to-terminal relays. In terminal-to-terminal relaying, a relay selection process is required to choose a suitable relay device (e.g., a relay terminal). In related technologies, the source and remote terminals can determine whether to select a device as a relay based on the link quality between the source / remote terminal and a candidate relay device. However, based on this method, if the link between the selected relay device and the target remote terminal is abnormal (e.g., poor link quality), it may lead to service forwarding failure. Figure 6 is a schematic flowchart of a communication method provided in an embodiment of this application to solve the problem of inappropriate relay terminal selection. The embodiment shown in Figure 6 can be executed by a first terminal. The method shown in Figure 6 may include step S610. In step S610, the first terminal receives the first information. The first information can be used to indicate the first link information between the second communication device and the third terminal. The second communication device can be a terminal or a network device. If the second communication device is a terminal, it can be referred to as the second terminal. The first link information could be, for example, the link quality information between the second communication device and the third terminal. Link quality information can be represented, for example, by the sidelink discovery reference signal received power (SD-RSRP) and / or the sidelink reference signal received power (SL-RSRP). For instance, if a PC5-RRC link is established between the second communication device and the third terminal, the link quality information can be obtained by measuring SL-RSRP. If no PC5-RRC link is established between the second communication device and the third terminal, the link quality information can be obtained by measuring SD-RSRP. The first information may include one or more of the following: the identifier of the second communication device, the identifier of the third terminal, the parameters of the first link between the second communication device and the third terminal, and the type of the parameters of the first link. The type of the parameters of the first link can be used to indicate the type to which the parameters of the first link belong. Taking link quality information as an example, the type of the parameters of the first link may include, for example, SD-RSRP and / or SL-RSRP. Accordingly, the parameters of the first link may be, for example, quality parameters, which may include the measurement results of SD-RSRP and / or SL-RSRP. The first information may include not only the first link information between the second communication device and the third terminal, but also link information between the second communication device and one or more other terminals. When the first information includes information about multiple links, it may include one or more of the following: identifiers of multiple terminals, types of multiple link information, quality parameters of multiple links, etc. As one possible implementation, the identifiers of the multiple terminals may be represented in the form of a list. The first terminal can be a source remote terminal. The third terminal can be a target remote terminal. Side-by-side communication can occur between the first terminal and the third terminal. The first terminal can also communicate side-by-side with the third terminal through a second communication device. In other words, the second communication device can act as a relay (e.g., a relay terminal) between the first terminal and the third terminal. Before selecting the second communication device as the relay device, it can be a candidate relay device. Based on the first information, the first terminal can obtain the first link information between the second communication device and the third terminal. When the first terminal performs the selection or reselection of a relay device, the first link information can help the first terminal determine whether to select the second communication device as the relay device. That is, when selecting a relay device, the first terminal can consider the link situation between the candidate relay device and the target remote terminal, thereby preventing the link between the relay device and the target remote terminal from causing the service forwarding failure of the side-by-side communication. Taking link quality information as an example, when the first terminal performs relay terminal selection or reselection, it can consider the link quality between the second communication device and the third terminal to determine whether to select the second communication device as the relay device from the first terminal to the third terminal. For example, the first terminal can consider the link quality of two side links simultaneously. The link quality of the two side links can include: the link quality between the first terminal and the second communication device, and the link quality between the second communication device and the third terminal. This approach can prevent service forwarding failures caused by poor link quality between the relay device and the target remote terminal. This application does not limit the device that sends the first information. The first information can be sent through one or more of a second communication device, a third terminal, and a network device. For example, the second communication device can send the first information to the first terminal. Alternatively, the third terminal can send the first information to the second communication device, and the second communication device can send the received first information to the first terminal. Or, the third terminal can send the first information to the network device, and the network device can send the first information to the first terminal. The following description uses Figure 7 as an example to illustrate how the second communication device sends the first information. Figure 7 is a schematic flowchart of a communication method provided in an embodiment of this application. The method shown in Figure 7 can be executed by a second communication device. The method shown in Figure 7 may include step S710. In step S710, the second communication device sends the first information. The second communication device can directly send the first information to the first terminal, or it can forward the first information to the first terminal through other devices. The second communication device can receive first information determined by other devices and send the first information to the first terminal. That is, the second communication device can forward the first information to the first terminal. For example, after receiving the first information, the second communication device can send the first information directly to the first terminal without performing any processing on the first information. Alternatively, the second communication device can process the received first information and send the processed first information to the first terminal. The processing of the first information by the second communication device may include, for example, confirming the first information. The second communication device can forward the first information to the first terminal after confirming the first information. The first information can be carried in one or more of the following messages: discovery message, discovery response message, PC5-RRC message, sidelike media access control element (SL MACCE), and sidelike control information (SCI). For example, the second communication device can send the first information to the first terminal by broadcasting a discovery message. If the second communication device and the first terminal have established a PC5-RRC link, the second communication device can send the first information to the first terminal via one or more of the following messages: PC5-RRC message, SL MACCE, and SCI. The first link information can be obtained by the second communication device and / or the third terminal. The second communication device and / or the third terminal can obtain the first link information in a manner determined by themselves. Alternatively, the second communication device and / or the third terminal can obtain the first link information by receiving information determined by other devices. The method by which the third terminal obtains the first link information is illustrated below using Figure 8 as an example. Figure 8 is a schematic flowchart of a communication method provided in an embodiment of this application. The method shown in Figure 8 can be executed by a third terminal. The method shown in Figure 8 may include step S810. In step S810, the third terminal obtains the first link information. As one implementation method, the third terminal can determine the first link information. Taking the first link information as link quality information as an example, the third terminal can measure the link quality with the second communication device. For example, the third terminal can perform SD-RSRP measurement or SL-RSRP measurement. The third terminal can feed back the first link information to the second communication device via second information. The second information can be carried in one or more of the following messages: discovery response message, PC5-RRC message, SL MACCE, and SCI. If no PC5-RRC link is established between the second communication device and the third terminal, the second information can be transmitted to the second communication device via a discovery response message. If a PC5-RRC link is established between the second communication device and the third terminal, the second information can be fed back to the second communication device via one or more of the following methods: PC5-RRC message, SL MACCE, and SCI. As another implementation, the third terminal can receive first link information determined by other devices to obtain the first link information. For example, the third terminal can receive first link information determined by a second communication device. As mentioned above, the first link information can be determined by the third terminal, or by a third device and / or other devices. The method for the second communication device to determine the first link information will be described in detail below. In one implementation, the first link information can be determined by the second communication device. Taking link quality information as an example, the second communication device can measure the link between itself and the third terminal to determine the first link information. For example, the second communication device can perform SD-RSRP measurement and / or SL-RSRP measurement. If a PC5-RRC link is established between the second communication device and the third terminal, the second communication device can perform SL-RSRP. If no PC5-RRC link is established between the second communication device and the third terminal, the second communication device can perform SD-RSRP measurement. In one embodiment, the second communication device can obtain the first link information by measuring the discovery message and / or discovery response message sent by the third terminal. Taking the first link information as link quality information as an example, the second communication device can obtain the first link information by measuring the link quality corresponding to the discovery message and / or the link quality corresponding to the discovery response message sent by the third terminal. As mentioned above, whether to select the second communication device as a relay terminal can be determined based on the first link information. The relay terminal can be used to relay data from the first terminal to the third terminal. In other words, when the second communication device is the relay terminal, the first terminal can use the second communication device to achieve terminal-to-terminal relay, thereby enabling side-by-side communication with the third terminal. The selection of a relay terminal can also be determined based on the first configuration information. That is, the first terminal can determine whether to select the second communication device as a relay terminal based on the first link information and the first configuration information. The first link information can be used to indicate the quality parameters of the first link between the second communication device and the third terminal. The first configuration information may include, for example, one or more of the following: a first threshold, a second threshold, and a third threshold. The first threshold can be a threshold value for the quality parameters of the first link. The quality parameters of the first link can be compared with the first threshold to determine whether to select the second communication device as a relay terminal. The second threshold can be a threshold value for the quality parameters of the second link. The second link can be the link between the second communication device and the first terminal. The quality parameters of the second link can be compared with the second threshold to determine whether to select the second communication device as a relay terminal. The third threshold can be the threshold value obtained by performing a first calculation on the quality parameters of the first link and the quality parameters of the second link. The first calculation can be performed on the quality parameters of the first and second links to obtain the calculation result, and then compared with the third threshold to determine whether to select the second communication device as the relay terminal. This application does not limit the specific calculation process or method of the first calculation. For example, the first calculation can be an average value calculation. The average value can be calculated as (quality parameter of the first link + quality parameter of the second link) / 2. It should be noted that this application does not limit the method of obtaining the quality parameters of the second link. The second link information can be determined by the first terminal and / or the second communication device. In some implementations, the second link information can be determined by measuring the link SD-RSRP of discovery messages and / or discovery response messages. For example, the first terminal can obtain the quality parameters of the second link by measuring the SD-RSRP of discovery messages sent by the second communication device. When the first terminal and the second communication device have established a PC5-RRC link, the quality parameters of the second link can be determined by measuring the SL-RSRP. For example, the first terminal can determine the quality parameters of the second link by measuring the SL-RSRP between itself and the second communication device. The second communication device may be a relay terminal when one or more of the following conditions are met: when the first configuration information includes a first threshold, the quality parameter of the first link is greater than or equal to the first threshold; when the first configuration information includes a second threshold, the quality parameter of the second link is greater than or equal to the second threshold; and when the first configuration information includes a third threshold, the value of the quality parameter of the first link and the quality parameter of the second link after a first calculation is greater than or equal to the third threshold. It should be noted that the selection of a second communication device as a relay terminal can also be determined based on other conditions or information. Understandably, in some cases, if the above conditions are met, a second communication device can be selected as a relay terminal. Alternatively, a second communication device can be identified as a candidate relay terminal, and based on other conditions or information, it can be selected as the relay terminal from one or more candidate relay terminals. Optionally, the first configuration information can be predefined by the communication protocol, pre-configured, or dynamically configured. For example, if the first terminal is outside the coverage area of ​​the network device, the first configuration information can be pre-configured. In one implementation, the first terminal can receive third information. This third information can be used to indicate the first configuration information. This application does not limit the sender of the third information. For example, the third information can be sent by a network device or a second communication device. The following uses Figure 9 as an example to illustrate the sending of the third information by a network device. Figure 9 is a flowchart illustrating a communication method provided in an embodiment of this application. The method shown in Figure 9 can be executed by a network device. The method shown in Figure 9 includes step S910. In step S910, the network device sends third information. The third information can be carried in RRC signaling and / or system broadcast messages. For example, when the first terminal is in RRC connected state, the third information can be carried in RRC proprietary signaling. Alternatively, when the first terminal is in RRC idle state or RRC inactive state, the third information can be carried in the network device's system broadcast message. When the third information is sent by the second communication device, the third information may be carried in one or more of the following messages: PC5-RRC message, SL MACCE, SCI. It is understood that when the third information is sent by the second communication device, the second communication device can have established a PC5-RRC link with the first terminal, and the second communication device can be located within the coverage area of ​​the network device. Figure 10 is a schematic diagram of a scenario applicable to an embodiment of this application. The scenario shown in Figure 10 includes a first terminal 1010, a second communication device 1020, a terminal 1031, a terminal 1032, a terminal 1033, and a network device 1040. The coverage area of ​​the network device can be 1045. The third terminal can be terminal 1031, terminal 1032, or terminal 1033. As shown in Figure 10, a PC5 link is established between the first terminal 1010 and the second communication device 1020, and the second communication device 1020 is located within the coverage area 1045. Therefore, in the scenario shown in Figure 10, the third information can be sent by the second communication device. As mentioned above, a PC5-RRC link can be established between the second communication device and the third terminal. The establishment of the PC5-RRC link can be triggered by a first condition. The first condition may include, for example, that the quality parameter of the first link is greater than or equal to the fourth threshold. It is understood that a PC5-RRC link can be established between the second communication device and the third terminal if the quality parameter of the first link between them is greater than or equal to the fourth threshold. The quality parameter of the first link information can be obtained, for example, through SD-RSRP measurement. A PC5-RRC link can be established between the second communication device and the third terminal if the SD-RSRP measurement result between them is greater than the fourth threshold. The fourth threshold can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, and configuration via broadcast discovery messages. The following example, using a third terminal, illustrates the configuration method for the fourth threshold. Network devices can configure a fourth threshold for third terminals. For example, when the third terminal is in RRC connected state, the network device can configure the fourth threshold through proprietary RRC signaling. Alternatively, when the third terminal is within the coverage area of ​​the network device and is in RRC idle or inactive state, the network device can broadcast the fourth threshold. The fourth threshold can be pre-configured. For example, when the third terminal is outside the coverage area of ​​the network device, the third terminal can obtain the fourth threshold through pre-configuration. The second communication device can configure a fourth threshold for the third terminal. For example, when broadcasting a discovery message, the second communication device can send this fourth threshold in the discovery message. The method embodiments of this application have been described in detail above with reference to Figures 1 to 10. The apparatus embodiments of this application will be described in detail below with reference to Figures 11 to 15. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments. Figure 11 is a schematic structural diagram of a terminal 1100 provided in an embodiment of this application. The terminal 1100 can be a first terminal. The terminal 1100 may include a first receiving unit 1110. The first receiving unit 1110 is used to receive first information; wherein the first information is used to indicate the first link information between the second communication device and the third terminal. Optionally, the first link information is link quality information. Optionally, the first link information is determined by the third terminal. Optionally, the first link information is indicated to the second communication device via second information. Optionally, the second information is carried in one or more of the following messages: discovery response message, PC5 radio resource control (PC5-RRC) message, sidelink media access control unit (SL MACCE) message, and sidelink control information (SCI). Optionally, the first link information is determined by the second communication device. Optionally, the first link information is obtained by measuring the received power SD-RSRP of the side link discovery reference signal corresponding to the discovery message or discovery response message. Optionally, the terminal 1100 is further configured to: determine whether to select the second communication device as a relay terminal based on the first link information. Optionally, the selection of the relay terminal is also determined based on the first configuration information. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal. The first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; wherein the first threshold is a threshold value of the quality parameters of the first link, the second threshold is a threshold value of the quality parameters of the second link between the second communication device and the first terminal, and the third threshold is a threshold value of the quality parameters of the first link and the second link after a first calculation. Optionally, the first calculation is an average value calculation. Optionally, the second communication device can be a relay terminal when one or more of the following conditions are met: when the first configuration information includes the first threshold, the quality parameter of the first link is greater than or equal to the first threshold; when the first configuration information includes the second threshold, the quality parameter of the second link is greater than or equal to the second threshold; and when the first configuration information includes the third threshold, the value of the quality parameter of the first link and the quality parameter of the second link after a first calculation is greater than or equal to the third threshold. Optionally, the terminal 1100 further includes: a second receiving unit, configured to receive third information; wherein the third information is used to indicate the first configuration information. Optionally, the third information is sent by a network device. Optionally, the third information is carried in RRC signaling and / or system broadcast messages. Optionally, the third information is sent by the second communication device. Optionally, the third information is carried in one or more of the following messages: PC5-RRC message, SL MACCE, SCI. Optionally, the first configuration information is pre-configured. Optionally, a PC5-RRC link is established between the second communication device and the third terminal, and the establishment of the PC5-RRC link is triggered by a first condition. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first condition includes: the quality parameters of the first link are greater than or equal to a fourth threshold. Optionally, the fourth threshold can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, or configuration via broadcast discovery message. Optionally, the first information includes one or more of the following: the identifier of the third terminal; the parameters of the first link between the second communication device and the third terminal; and the type of the parameters of the first link. Optionally, the first information is carried in one or more of the following messages: discovery message, discovery response message, PC5-RRC message, SL MACCE, and SCI. Optionally, the first link information includes the received power SD-RSRP of the side link discovery reference signal and / or the received power SL-RSRP of the side link reference signal. Figure 12 is a schematic structural diagram of another communication device 1200 provided in an embodiment of this application. The communication device 1200 can be a second communication device. The communication device 1200 may include a first transmitting unit 1212. The first sending unit 1210 is used to send first information to the first terminal; wherein the first information is used to indicate the first link information between the second communication device and the third terminal. Optionally, the first link information is link quality information. Optionally, the first link information is determined by the third terminal. Optionally, the first link information is indicated to the second communication device via second information. Optionally, the second information is carried in one or more of the following messages: discovery response message, PC5 radio resource control (PC5-RRC) message, sidelink media access control unit (SL MACCE) message, and sidelink control information (SCI). Optionally, the first link information is determined by the second communication device. Optionally, the first link information is obtained by measuring the received power SD-RSRP of the side link discovery reference signal corresponding to the discovery message or discovery response message. Optionally, whether to select the second communication device as the relay terminal is determined based on the first link information. Optionally, the selection of the relay terminal is also determined based on the first configuration information. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal. The first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; wherein the first threshold is a threshold value of the quality parameters of the first link, the second threshold is a threshold value of the quality parameters of the second link between the second communication device and the first terminal, and the third threshold is a threshold value of the quality parameters of the first link and the second link after a first calculation. Optionally, the first calculation is an average value calculation. Optionally, the second communication device can be a relay terminal when one or more of the following conditions are met: when the first configuration information includes the first threshold, the quality parameter of the first link is greater than or equal to the first threshold; when the first configuration information includes the second threshold, the quality parameter of the second link is greater than or equal to the second threshold; and when the first configuration information includes the third threshold, the value of the quality parameter of the first link and the quality parameter of the second link after a first calculation is greater than or equal to the third threshold. Optionally, the communication device further includes: a second transmitting unit, configured to transmit third information to the first terminal; The third information is used to indicate the first configuration information. Optionally, the third information is carried in one or more of the following messages: PC5-RRC message, SL MACCE, SCI. Optionally, a PC5-RRC link is established between the second communication device and the third terminal, and the establishment of the PC5-RRC link is triggered by a first condition. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first condition includes: the quality parameters of the first link are greater than or equal to a fourth threshold. Optionally, the fourth threshold can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, or configuration via broadcast discovery message. Optionally, the first information includes one or more of the following: the identifier of the third terminal; the parameters of the first link between the second communication device and the third terminal; and the type of the parameters of the first link. Optionally, the first information is carried in one or more of the following messages: discovery message, discovery response message, PC5-RRC message, SL MACCE, and SCI. Optionally, the first link information is SD-RSRP and / or side link reference signal received power SL-RSRP. Figure 13 is a schematic structural diagram of another terminal 1300 provided in an embodiment of this application. Terminal 1300 can be a third terminal. Terminal 1300 may include a first acquisition unit 1310. The first acquisition unit 1310 is used to acquire first link information between the third terminal and the second communication device; wherein, the first link information is used by the first terminal to determine whether the second communication device is a relay terminal. Optionally, the first link information is link quality information. Optionally, the first link information is measured by the third terminal. Optionally, the first chain information is sent to the second communication device via second information. Optionally, the second information is carried in one or more of the following messages: discovery response message, PC5 radio resource control (PC5-RRC) message, sidelink media access control unit (SL MACCE) message, and sidelink control information (SCI). Optionally, a PC5-RRC link is established between the second communication device and the third terminal, and the establishment of the PC5-RRC link is triggered by a first condition. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first condition includes: the quality parameters of the first link are greater than or equal to a fourth threshold. Optionally, the fourth threshold can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, or configuration via broadcast discovery message. Optionally, the first link information includes: the received power of the side link discovery reference signal SD-RSRP and / or the received power of the side link reference signal SL-RSRP. Figure 14 is a schematic structural diagram of a network device 1400 provided in an embodiment of this application. The network device 1400 may include a third transmitting unit 1410. The third sending unit 1410 is used to send third information to the first terminal; wherein the third information is used to indicate the first configuration information, and whether to select the second communication device as the relay terminal is determined based on the first configuration information and the first link information, wherein the first link information is the information of the link between the second communication device and the third terminal. Optionally, the first link information is link quality information. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal. The first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; wherein the first threshold is a threshold value of the quality parameters of the first link, the second threshold is a threshold value of the quality parameters of the second link between the second communication device and the first terminal, and the third threshold is a threshold value of the quality parameters of the first link and the second link after a first calculation. Optionally, the first calculation is an average value calculation. Optionally, the second communication device can be a relay terminal when one or more of the following conditions are met: when the first configuration information includes the first threshold, the quality parameter of the first link is greater than or equal to the first threshold; when the first configuration information includes the second threshold, the quality parameter of the second link is greater than or equal to the second threshold; and when the first configuration information includes the third threshold, the value of the quality parameter of the first link and the quality parameter of the second link after a first calculation is greater than or equal to the third threshold. Optionally, a PC5 Radio Resource Control (PC5-RRC) link is established between the second communication device and the third terminal, and the establishment of the PC5-RRC link is triggered by a first condition. Optionally, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first condition includes: the quality parameters of the first link are greater than or equal to a fourth threshold. Optionally, the fourth threshold can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, or configuration via broadcast discovery message. Figure 15 is a schematic structural diagram of a communication device according to an embodiment of this application. The dashed lines in Figure 15 indicate that the unit or module is optional. This device 1500 can be used to implement the methods described in the above method embodiments. Device 1500 can be a chip, a terminal device, or a network device. Apparatus 1500 may include one or more processors 1510. The processor 1510 may support apparatus 1500 in implementing the methods described in the preceding method embodiments. The processor 1510 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The apparatus 1500 may further include one or more memories 1520. The memories 1520 store a program that can be executed by the processor 1510, causing the processor 1510 to perform the methods described in the preceding method embodiments. The memories 1520 may be independent of the processor 1510 or integrated into the processor 1510. The device 1500 may also include a transceiver 1530. The processor 1510 can communicate with other devices or chips via the transceiver 1530. For example, the processor 1510 can send and receive data with other devices or chips via the transceiver 1530. This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application. This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application. This application also provides a computer program. This computer program can be applied to the terminal or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal or network device in various embodiments of this application. It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B. In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information. In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured. In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol. In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this. In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application. In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that... The communication method includes: The first terminal receives the first information; The first information is used to indicate the first link information between the second communication device and the third terminal. 。 2. The communication method according to claim 1, wherein... The characteristic is that the first link information is link quality. information.

3. The communication method according to claim 1 or 2, The characteristic is that the first link information is provided by the third... Terminal confirmed.

4. The communication method according to claim 3 The method is characterized in that the first link information is indicated to the second information. Second communication equipment.

5. The method according to claim 4 The information delivery method is characterized in that the second information is carried in one or more of the following messages: discovery response message, PC5 radio resource control (PC5-RRC) message, sidelink media access control unit (SL MACCE) message, and sidelink... Road control information (SCI).

6. As described in claim 1 or 2 The communication method is characterized in that the first link information is provided by The second communication device is determined.

7. According to claim 6 The communication method is characterized in that the first link information is obtained by measuring the side link discovery reference signal corresponding to the discovery message or discovery response message. Power is obtained from SD-RSRP.

8. Any of the claims 1-7 One of the aforementioned The communication method, characterized in that it further includes: Based on the first link information, the first terminal determines whether to select... The second communication device serves as a relay terminal.

9. According to the right The communication method according to claim 8, characterized in that the relay The selection of the terminal is also determined based on the first configuration information.

10. According to the communication method of claim 9, the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; Wherein, the first threshold is a threshold value for the quality parameters of the first link, the second threshold is a threshold value for the quality parameters of the second link between the second communication device and the first terminal, and the third threshold is a threshold value for the quality parameters of the first link and the first... The quality parameters of the two links are the threshold values ​​after the first calculation. 1 1. The communication device according to claim 10 The information method is characterized in that the first calculation is an average value calculation. 1 2. The communication method according to claim 10 or 11, characterized in that, under the following condition... When one or more of the following conditions are met, the second communication device can be a relay terminal: When the first configuration information includes the first threshold In this case, the quality parameter of the first link is greater than or equal to the first threshold; The first configuration information includes the second threshold. In this case The quality parameter of the second link is greater than or equal to the second threshold; and When the first configuration information includes the third threshold, the quality parameters of the first link and the second link... The quality parameter, after the first calculation, is greater than or equal to the third threshold. 1 3. The communication method according to any one of claims 9-12, characterized in that the communication method further comprises: The first terminal connects Receive third-party information; The third information is used to indicate the First configuration information.

14. According to rights The communication method of claim 13, characterized in that the third The information is sent by network devices.

15. The claim 14 The communication method is characterized in that the third information is carried on RR. C signaling and / or system broadcast messages.

16. According to The communication method according to claim 13, characterized in that, the The third message is sent by the second communication device.

17. The communication method according to claim 16, characterized in that the first... The three pieces of information are carried in one or more of the following messages: PC5-RRC message, SL MACCE, SCI. 1 8. The communication method according to any one of claims 9-12, characterized in that... Therefore, the first configuration information is pre-configured.

19. The communication method according to any one of claims 1-18, characterized in that the second communication... A PC5-RRC connection is established between the communication device and the third terminal. The establishment of the PC5-RRC link is triggered by a first condition.

20. The communication method according to claim 19, wherein the first link information is used to indicate the second communication device. The quality parameters of the first link between the device and the third terminal, the The first condition includes: the quality parameter of the first link is greater than or equal to the fourth threshold.

21. The communication method according to claim 20, characterized in that, The fourth threshold is configured in one or more of the following ways: pre-configured, via proprietary... Signaling configuration, system broadcast configuration, and broadcast message discovery configuration.

22. The communication method according to any one of claims 1-21, characterized in that the first information includes one or more of the following information. item: The identifier of the third terminal; The second communication device and the third terminal Parameters of the first link between the ends; and The type of the parameters of the first link.

23. The communication method according to any one of claims 1-22, characterized in that... The first information is carried in one or more of the following messages: discovery message Discover response messages, PC5-RRC messages, SL MACCE, SCI.

24. According to claims Communication as described in any one of 1-23 The method is characterized in that the first link information includes SD-RSRP and / or side link reference signal received power SL-RSRP.

25. A communication method, characterized in that, The communication method includes: The second communication device sends a message to the first terminal. Send the first message; Wherein, the first information is used Indicating the first link information between the second communication device and the third terminal 。 26. The communication method according to claim 25 The method is characterized in that the first link information is link quality information. interest.

27. The communication method according to claim 25 or 26, wherein... The characteristic is that the first link information is determined by the third terminal.

28. The communication method according to claim 27, wherein the first link information is indicated to the second communication device through second information.

29. The communication method according to claim 28, wherein the second information Carried in one or more of the following messages: discovery response message, PC5 Radio Resource Control (RRC) PC5-RRC messages, side link media Body access control unit SL MACCE and side chain Road control information (SCI).

30. The communication method according to claim 25 or 26, characterized in that the first link information is generated by the second... The communication equipment has been determined.

31. The communication method according to claim 30, wherein... The characteristic is that the first link information is obtained by measuring the side link corresponding to the discovery message or discovery response message. The received power of the reference signal is obtained by SD-RSRP.

32. The device according to any one of claims 25-31 The communication method is characterized by whether or not the second communication device is selected. The relay terminal is determined based on the first link information.

33. The communication method according to claim 32, wherein the selection of the relay terminal is further determined based on the first configuration information.

34. The communication method according to claim 33, wherein the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; Wherein, the first threshold is the first link The threshold value of the quality parameter, the second threshold is the second passage The first communication device and the first terminal The quality parameter thresholds for the two links, wherein the third threshold is the first link The quality parameters of the road and the quality parameters of the second link are threshold values ​​after the first calculation. 3 5. The communication method according to claim 34, wherein the first calculation is an average value calculation.

36. According to the rights The communication method described in claim 34 or 35 is characterized in that the second communication device can achieve the following when one or more of the following conditions are met: Enough for the middle Following the terminal: When the first configuration information includes the first threshold, the quality parameter of the first link is greater than or equal to the first threshold. The first configuration information includes the second door Under certain conditions, the quality parameter of the second link is greater than or equal to the second threshold; as well as When the first configuration information includes the third threshold, the quality parameters of the first link and the quality parameters of the second link are calculated as follows: Greater than or equal to the third threshold.

37. According to claims The communication method according to any one of 33-36, characterized in that the communication method further includes: The second communication device sends to the The first terminal sends the third message; The third information is used to indicate the first Configuration information.

38. The communication method according to claim 37, wherein the third information is carried in one or more of the following messages: P C5-RRC message, SL MACCE, SCI.

39. The communication method according to any one of claims 25-38, characterized in that a PC5-RRC link is established between the second communication device and the third terminal, wherein the PC5-RRC link... The establishment of an RC link is triggered by the first condition.

40. According to the right The communication method of claim 39, characterized in that the first link information is used to indicate the quality of the first link between the second communication device and the third terminal. The quality parameters, the first condition including: the quality parameter of the first link is greater than or equal to The fourth threshold.

41. The communication method according to claim 40, wherein the fourth threshold is configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, or via... Broadcast discovery message configuration.

42. The claim 25-41 The communication method described above is characterized in that the first information includes one or more of the following: The identifier of the third terminal; The second communication device and the first The parameters of the first link between the three terminals; and The type of parameters of the first link 。 43. The communication method according to any one of claims 25-42, characterized in that the first information Carried in one or more of the following messages Items: Discovery message, Discovery response message, PC5-RRC message, SL MACCE, SCI.

44. The communication method according to any one of claims 25-43, characterized in that the first link Information for SD-RSRP and / or side link reference signal connection SL-RSRP power reception.

45. A kind A communication method, characterized in that the communication method includes: Third terminal Obtain the first... Link information; Wherein, the first link information is used for the first The terminal determines whether the second communication device is a relay terminal.

46. ​​According to the right The communication method according to claim 45, characterized in that the first One link information is link quality information.

47. The communication method according to claim 45 or 46, wherein the first link information is measured by the third terminal.

48. The communication method according to claim 47, characterized in that... Therefore, the first chain information is sent to the second communication device through the second information.

49. The communication method according to claim 48, wherein the second information is carried in one or more of the following messages: discovery response message, PC5 Wireless Resource Control (CRC) messages, sidechain The media access control unit (SL MACCE) and the side link control information (SCI) are included.

50. The communication method according to any one of claims 45-49, characterized in that the second A PC5-RR communication connection is established between the communication device and the third terminal. The establishment of the PC5-RRC link is triggered by a first condition.

51. The communication method according to claim 50, characterized in that, the The first link information is used to indicate the first link between the second communication device and the third terminal. The link quality parameters, the first condition including: the quality parameters of the first link are greater than or equal to the fourth threshold.

52. The communication method according to claim 51 The method, characterized in that the fourth gate It can be configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, and configuration via broadcast discovery messages.

53. The communication method according to any one of claims 45-52, characterized in that the first link information includes: the received power SD-RSRP of the side link discovery reference signal and / or Side link reference signal received power SL-RSRP. 5 4. A communication method, characterized in that, the Communication methods include: The network device sends third information to the first terminal; The third information is used to indicate the first configuration information. Whether to select the second communication device as the relay terminal is determined based on the first configuration information and the first link information. The first link information is the link information between the second communication device and the third terminal.

55. The communication method according to claim 54, wherein the first link information is link quality information.

56. The communication method according to claim 54 or 55, wherein the first link information is used to indicate the second communication device and the third terminal. The quality parameters of the first link between them, the first configuration information includes One or more of the following information: First Threshold, second threshold, and third threshold; Wherein, the first threshold is the The threshold values ​​for the quality parameters of the first link, wherein the second threshold is the threshold between the second communication device and the... The third threshold is a threshold value for the quality parameters of the second link between the first terminals, wherein the third threshold is the quality parameters of the first link and the second link. The quality parameters of the road are the threshold values ​​after the first calculation.

57. The communication method according to claim 56, characterized in that, First The calculation is based on the average value.

58. The communication method according to claim 56 or 57, characterized in that the second communication device is capable of being a relay when one or more of the following conditions are met. terminal: When the first configuration information includes the first threshold, the first... The quality parameter of a link is greater than or equal to the first threshold; When the first configuration information includes the second threshold, the quality parameter of the second link is greater than or equal to the second threshold. Threshold; and The first configuration information includes the third door. Under certain conditions, the quality parameters of the first link and the quality parameters of the second link, after the first calculation, are greater than or equal to the third threshold.

59. The claim 54-58 The communication method described above is characterized in that the second communication device and A PC5 Radio Resource Control (CRC) link is established between the third terminals, and the establishment of the PC5-RRC link is triggered by a first condition.

60. According to claim 59 The communication method is characterized in that the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first condition includes: the quality of the first link. The quantity parameter is greater than or equal to the fourth threshold.

61. According to the right The communication method of claim 60 is characterized in that... The fourth threshold is configured in one or more of the following ways: pre- Configuration, configuration via dedicated signaling, configuration via system broadcast Configure the message to be discovered via broadcast.

62. A kind of end The terminal is characterized in that it is a first terminal, and the terminal includes: No. A receiving unit is used to receive the first information; Among them, The first information is used to indicate the first link information between the second communication device and the third terminal.

63. The terminal according to claim 62, wherein the first link information is link quality information.

64. According to claim 62 or 6 The terminal described in 3 is characterized in that the first link information is provided by the... The third terminal is determined.

65. According to claim 64 The terminal described above is characterized in that the first link information is transmitted... The second information is then sent to the second communication device.

66. The terminal according to claim 65, wherein the second information is carried on a... One or more of the following messages: Discovery Response Message, PC5 Radio Resource Control PC5-RRC messages, sidelink media access control unit SL MACCE, and sidelink control information SCI. 6 7. The terminal according to claim 62 or 63, wherein The characteristic is that the first link information is provided by the second communication device. Sure.

68. The terminal according to claim 67 The first link information is obtained by measuring the received power SD-RSRP of the side link discovery reference signal corresponding to the discovery message or discovery response message.

69. The terminal according to any one of claims 62-68, characterized in that the terminal is further configured to: Based on the first link information, the first terminal determines whether to select the second communication device as a relay terminal.

70. The terminal according to claim 69, wherein the selection of the relay terminal is further determined based on the first configuration information.

71. According to The terminal according to claim 70, characterized in that, the The first link information is used to indicate the second... The quality parameters of the first link between the communication device and the third terminal The first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold. Three thresholds; Wherein, the first threshold is the threshold value of the quality parameter of the first link, and the second threshold is the threshold value of the second communication device. The third threshold is the quality parameter threshold of the second link between the first terminal and the first terminal, wherein the third threshold is the quality parameter of the first link and the threshold of the second link. The second The quality parameters of the link are the threshold values ​​after the first calculation.

72. The terminal according to claim 71, wherein the first calculation is an average value calculation.

73. According to claim 7 The terminal described in 1 or 72 is characterized in that it satisfies one of the following conditions When there are multiple types, the second communication device can be a relay terminal: If the first configuration information includes the first threshold, then the first chain The quality parameters of the road are greater than or equal to the first threshold; exist The first configuration information includes the second gate Under limited conditions, the quality parameters of the second link are greater than or equal to Equal to the second threshold; and The first configuration information includes the In the case of the third threshold, the quality parameters of the first link After the quality parameters of the second link are calculated in the first step The value is greater than or equal to the third threshold.

74. According to The terminal according to any one of claims 70-73, characterized in that the terminal further comprises: The second receiving unit is used to receive... Third information; The third information is used to indicate the first configuration information. 。 75. The claim 74 The terminal is characterized in that the third information is sent by a network device. 76 The terminal according to claim 75, wherein the third information is carried in RRC signaling and / or system broadcast messages.

77. According to the rights The terminal of claim 74, characterized in that the third The information is sent by the second communication device.

78. The terminal according to claim 77, wherein the third information is carried in one or more of the following messages: PC5-RRC message, SL message, etc. MACCE, SCI.

79. According to the rights The terminal described in any one of 70-73 is characterized in that the first configuration information is pre-configured.

80. The claim 62-79 The terminal described in the item is characterized in that the second communication device and the third terminal A PC5-RRC link is established between the terminals, and the establishment of the PC5-RRC link is triggered by a first condition.

81. The terminal according to claim 80, wherein the first link information is used to indicate the... The quality parameters of the first link between the second communication device and the third terminal, The first condition includes: the quality parameter of the first link is greater than or equal to the fourth threshold.

82. The terminal according to claim 81, characterized in that the first... The four thresholds can be configured in one or more of the following ways: pre-configuration, via dedicated signaling. Configuration, configuration via system broadcast, configuration via broadcast discovery message.

83. The terminal according to any one of claims 62-82, characterized in that... The first information includes the following information: One or more: The identifier of the third terminal; The parameters of the first link between the second communication device and the third terminal; and The type of the parameters of the first link.

84. The final product according to any one of claims 62-83 The terminal is characterized in that the first information is carried in the following message. One or more of the following: Discover message, Discover response message Information, PC5-RRC messages, SL MACCE, SCI.

85. The claim 62-84 The terminal, characterized in that the first link information includes Received power of sidelink discovery reference signal SD-RSRP and / or sidelink SL-RSRP (Side Reference Signal Received Power).

86. One A communication device, characterized in that the communication device is a second communication device, the communication device comprising: The first sending unit is used to send first information to the first terminal; The first information is used to instruct the second communication device and the third terminal. The first link information between them.

87. The claim 86 The communication device is characterized in that the first link information is a chain Road quality information.

88. According to claim 86 or 87 The communication device described above is characterized in that the first link information is determined by the third terminal.

89. According to the rights The communication device of claim 88, characterized in that the first link information is transmitted through the first... The second information is sent to the second communication device.

90. The communication device according to claim 89 The equipment is characterized in that the second information is carried in the following message. One or more of the following: Discovery response message, PC5 wireless resource control Control PC5-RRC messages, side link media access control The control unit SL MACCE and the side link control information SCI.

91. The communication device according to claim 86 or 87, wherein the first link information is determined by the second communication device.

92. The communication device according to claim 91, wherein the received power SD-RSRP of the sidelink discovery reference signal corresponding to the discovery message or discovery response message is obtained.

93. The communication device according to any one of claims 86-92, characterized in that, whether the second communication device is selected as a relay. The terminal is determined based on the first link information.

94. Root The communication device according to claim 93 The feature is that the selection of the relay terminal is also based on the first configuration information. Sure.

95. The communication device according to claim 94, characterized in that, the first Link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal, and the first configuration information includes... One or more of the following information: first threshold, second threshold, and third threshold; Wherein, the first threshold is the quality of the first link. Quantity parameters The threshold values ​​are defined as follows: the second threshold is a quality parameter threshold value for the second link between the second communication device and the first terminal; the third threshold is a quality parameter threshold value for the first link and the threshold value for the second link between the second communication device and the first terminal. The quality parameters of the two links are the threshold values ​​after the first calculation.

96. According to the rights The communication device described in claim 95 is characterized in that the first calculation is an average value calculation.

97. The communication device according to claim 95 or 96, characterized in that... The second passage is valid when one or more of the following conditions are met. The communication equipment can provide relay terminals with: When the first configuration information includes the first threshold, the quality parameters of the first link Greater than or equal to the first threshold; The first configuration information includes the second door Under certain conditions, the quality parameter of the second link is greater than or equal to the second threshold; and When the first configuration information includes the third threshold. The quality parameters of the first link and the quality parameters of the second link The value after the first calculation is greater than or equal to the third threshold.

98. The communication device according to any one of claims 94-97, characterized in that the communication device further comprises: Second dispatch order Yuan is used to send third information to the first terminal; Among them, The third information is used to indicate the first configuration information.

99. The communication device according to claim 98, wherein the third information is carried on a carrier... One or more of the following messages: PC5-RRC message, SL MACCE, SCI.

100. The communication device according to any one of claims 96-99, characterized in that a PC5-RRC link is established between the second communication device and the third terminal, wherein the PC5- The establishment of an RRC link is triggered by the first condition.

101. According to claim 100 The communication device is characterized in that the first link information is used to indicate the quality parameters of the first link between the second communication device and the third terminal. The conditions include: the quality parameter of the first link is greater than or equal to the fourth threshold. 102 According to the communication device of claim 101, the fourth threshold is determined by one or more of the following methods: Pre-configured: pre-configured, via dedicated There are signaling configurations, system broadcast configurations, and broadcast discovery message configurations.

103. The communication device according to any one of claims 86-102, characterized in that the first information includes one or more of the following: The third terminal Logo; Between the second communication device and the third terminal The parameters of the first link; and The first chain The type of parameters for the path.

104. According to claims 86-103 The communication device described in any one of the following descriptions is characterized in that... The first piece of information is carried in one or more of the following messages: [Send] Current message, discovery response message, PC5-RRC message, SL MAC CE, SCI.

105. According to claim 86- The communication device according to any one of 104 is characterized in that the first link information is SD-RSRP and / or side link reference signal received power SL-RSRP.

106. A terminal, characterized in that the terminal is a third terminal. The terminal includes: The first acquisition unit is used to acquire the connection between the third terminal and the first... First link information between the two communication devices; The first link information is used by the first terminal to determine whether the second communication device is a relay terminal. 1 07. The terminal according to claim 106, characterized in that... The key point is that the first link information is link quality information.

108. The terminal according to claim 106 or 107, wherein the first link information is measured by the third terminal. 10 9. The terminal according to claim 108, characterized in that... Therefore, the first chain information is sent to the second communication device through the second information.

110. The terminal according to claim 109, characterized in that, The second information is carried in one or more of the following messages: discovery response message, P C5 Radio Resource Control (PC5-RRC) messages, Sidelink Media Access Control (SL) MACCE messages, and Sidelink Control Information (SCI) messages. 1 11. According to claim 106- The terminal as described in any one of 110, characterized in that a PC5-RRC link is established between the second communication device and the third terminal, and the establishment of the PC5-RRC link is triggered by a first condition.

112. The terminal according to claim 111, wherein the first link information is used to indicate the second communication device and the first... The quality parameters of the first link between the three terminals, the first condition including The quality parameter of the first link is greater than or equal to The fourth threshold.

113. The terminal according to claim 112, wherein its features The fourth threshold is configured in one or more of the following ways: pre-configuration, configuration via dedicated signaling, configuration via system broadcast, and configuration via broadcast discovery message.

114. The terminal according to any one of claims 106-113, wherein the first link information includes: the received power SD-RSRP of the side link discovery reference signal and / or the received power SL-RSRP of the side link reference signal.

115. A network device, characterized in that the network device comprises: The third transmitting unit is used to send to the first The terminal sends third information; The third information is used to indicate First configuration information: Whether to select the second channel. The communication device is a relay terminal based on the first configuration information and the first link information. The first link information is defined as the link information between the second communication device and the third terminal. 。 116. The network device according to claim 115, wherein the first link information is link quality information.

117. The network device according to claim 115 or 116, wherein the first link information is used to indicate the Second call The quality parameters of the first link between the communication device and the third terminal, wherein the first configuration information includes one or more of the following: a first threshold, a second threshold, and a third threshold; Wherein, the first The threshold is the threshold value of the quality parameter of the first link, and the second threshold is the threshold value of the second link. The third threshold is the quality parameter threshold of the second link between the communication device and the first terminal, wherein the quality parameter of the first link and the quality parameter of the second link are obtained after passing through the first... The calculated threshold value.

118. According to claim 117 The network device described above is characterized in that the first calculation is an average value calculation.

119. The network device according to claim 117 or 118, characterized in that, satisfying one or more of the following conditions In the case of multiple scenarios, the second communication device can be a relay terminal: Residence When the first configuration information includes the first threshold, the quality parameter of the first link is greater than or equal to the first threshold; In the first configuration information package Including the second threshold The quality parameter of the second link is greater than or equal to the second threshold; and When the first configuration information includes the third threshold, the quality parameters of the first link and the quality parameters of the second link are... The value of the number after the first calculation is greater than or It equals the third threshold.

120. The network device according to any one of claims 115-119, characterized in that an established communication relationship is formed between the second communication device and the third terminal. PC5 Wireless Resource Control PC5- The establishment of the PC5-RRC link is triggered by a first condition.

121. The network device according to claim 120, wherein the first link information is used... Instructing the second communication device The quality parameters of the first link between the first link and the third terminal, wherein the first condition includes: the quality parameters of the first link are greater than or equal to a fourth threshold. 。 122. According to the rights The network device described in claim 121 is characterized in that the fourth threshold is configured in one or more of the following ways: pre-configuration, Through dedicated signaling configuration, through System broadcast configuration, and message discovery configuration via broadcast.

123. A terminal, characterized in that it includes a memory and a processing unit. The memory is used to store... The processor is configured to invoke a program in the memory to perform the method as described in any one of claims 1-24 and 45-53.

124. A kind Communication equipment, characterized in that, It includes a memory and a processor, the memory being used to store a program, and the processor being used to invoke the program in the memory to perform as claimed in claim 25- The method described in any one of the 44 。 125. A network device, characterized in that it includes a memory and a processor, the memory being used to store a program, and the processor being used to call the program. The program in memory, to execute as claimed in claim 54 The method described in any one of the following -61.

126. An apparatus, characterized in that it includes a processor for calling a program from a memory. To perform as claimed in claims 1-24 and 45- The method described in any one of the 53.

127. An apparatus, characterized in that it includes a processor for retrieving data from a memory. The program is invoked to perform the operation as described in claims 25-4. The method described in any one of the following 4.

128. An apparatus, characterized in that it includes a processor for retrieving data from a memory. Invoke the program to perform as described in claim 54- The method as described in any one of 61.

129. A chip, characterized in that it includes a processor for calling programs from memory. The sequence enables the device equipped with the chip to perform... The method as described in any one of claims 1-24 and 45-53.

130. A chip, whose The feature is that it includes a processor for processing data from storage. The device invokes a program to cause the device equipped with the chip to perform any one of claims 25-44. method.

131. A chip, wherein The feature is that it includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform as claimed in claim 1. The method described in any one of 54-61 。 132. A computer-readable storage medium, characterized in that a program is stored thereon, the program... The sequence causes the computer to execute as claimed in claim 1. The method described in any one of -24 and 45-53.

133. A computer-readable storage device The medium is characterized in that it stores a program thereon, the program causing a computer to perform the method as described in any one of claims 25-44.

134. A computer-readable storage medium, characterized in that it stores a program thereon, the program causing a computer to perform the method as described in any one of claims 54-61.

135. A computer program product, characterized in that it comprises a program that causes a computer to perform the method as described in any one of claims 1-24 and 45-53.

136. A computer program product, characterized in that it comprises a program that causes a computer to perform the method as described in any one of claims 25-44.

137. A computer program product, characterized in that it includes a program that causes a computer to perform the method as described in any one of claims 54-61.

138. A computer program, characterized in that the computer program causes a computer to perform the method as described in any one of claims 1-24 and 45-53.

139. A computer program, characterized in that the computer program causes a computer to perform the method as described in any one of claims 25-44.

140. A computer program, characterized in that the computer program causes a computer to perform the method as described in any one of claims 54-61.

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