Configuration information acquisition method, configuration information forwarding method and terminal equipment

Abstract

Provided are a configuration information acquisition method, a configuration information forwarding method and a terminal device, the configuration information acquisition method comprising: receiving first indication information sent by a first network device, the first indication information indicating whether the first network device supports terminal-to-terminal relay; according to the embodiment of the invention, the first indication information is introduced, and the first indication information is designed to indicate whether the first network equipment supports the terminal-to-terminal relay or not, so that the terminal-to-terminal relay configuration information is obtained. That is, the first indication information can indicate whether the first network device has the capability of configuring the first terminal device to perform the terminal-to-terminal relay, equivalently, the first indication information can be used for guiding the first terminal device to obtain the relay configuration information of the first terminal device for the terminal-to-terminal relay. Therefore, the communication performance of the first terminal device during terminal-to-terminal relay can be improved.

Description

Configuration information acquisition method, configuration information forwarding method and terminal device Technical Field Embodiments of the present application relate to the field of communications, and more specifically, to a configuration information acquisition method, a configuration information forwarding method, and a terminal device. Background Art For terminal-to-terminal relay, the source remote terminal accesses the target remote terminal through a relay terminal with relay function. The source remote terminal, the relay terminal and the target remote terminal are connected through a side link, and the relay terminal transmits data between the source remote terminal and the target remote terminal. However, the related art does not involve a detailed solution of how the relay terminal and the remote terminal implement terminal-to-terminal relay. For example, the related art does not involve a solution of how the relay terminal and the remote terminal obtain relay configuration information for terminal-to-terminal relay. Summary of the invention The present application provides a configuration information acquisition method, a configuration information forwarding method and a terminal device, which can improve the communication performance of terminal-to-terminal relay. In a first aspect, an embodiment of the present application provides a method for obtaining configuration information, including: receiving first indication information sent by a first network device, where the first indication information indicates whether the first network device supports terminal-to-terminal relay; Relay configuration information for the terminal-to-terminal relay is acquired based on the first indication information. In a second aspect, an embodiment of the present application provides a configuration information forwarding method, including: receiving a first request sent by a first terminal device, where the first request is used to request to obtain relay configuration information for terminal-to-terminal relay; Execute a reselection operation of the relay terminal or send the relay configuration information or a rejection response message to the first terminal device, wherein the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device. In a third aspect, an embodiment of the present application provides a first terminal device for executing the method in the first aspect or its respective implementations mentioned above. Specifically, the first terminal device includes a functional module for executing the method in the first aspect or its respective implementations mentioned above. In one implementation, the first terminal device may include a processing unit, and the processing unit is used to perform functions related to information processing. For example, the processing unit may be a processor. In one implementation, the first terminal device may include a sending unit and / or a receiving unit. The sending unit is used to perform functions related to sending, and the receiving unit is used to perform functions related to receiving. For example, the sending unit may be a transmitter or a transmitter, and the receiving unit may be a receiver or a receiver. For another example, the first terminal device is a communication chip, the sending unit may be an input circuit or an interface of the communication chip, and the sending unit may be an output circuit or an interface of the communication chip. In a fourth aspect, an embodiment of the present application provides a second terminal device for executing the method in the second aspect or its respective implementations mentioned above. Specifically, the second terminal device includes a functional module for executing the method in the second aspect or its respective implementations mentioned above. In one implementation, the second terminal device may include a processing unit, which is used to perform functions related to information processing. For example, the processing unit may be a processor. In one implementation, the second terminal device may include a sending unit and / or a receiving unit. The sending unit is used to perform functions related to sending, and the receiving unit is used to perform functions related to receiving. For example, the sending unit may be a transmitter or a transmitter, and the receiving unit may be a receiver or a receiver. For another example, the second terminal device is a communication chip, the receiving unit may be an input circuit or an interface of the communication chip, and the sending unit may be an output circuit or an interface of the communication chip. In a fifth aspect, an embodiment of the present application provides a first terminal device, including a transceiver, a processor, and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the transceiver and / or the processor executes the method in the first aspect or its various implementations involved above. In one implementation, the number of the processor is one or more, and the number of the memory is one or more. In one implementation, the memory may be integrated with the processor, or the memory may be provided separately from the processor. In one implementation, the transceiver includes a transmitter (transmitter) and a receiver (receiver). In a sixth aspect, an embodiment of the present application provides a second terminal device, including a transceiver, a processor, and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the transceiver and / or the processor executes the method in the second aspect or its various implementations involved above. In one implementation, the number of the processor is one or more, and the number of the memory is one or more. In one implementation, the memory may be integrated with the processor, or the memory may be provided separately from the processor. In one implementation, the transceiver includes a transmitter (transmitter) and a receiver (receiver). In a seventh aspect, an embodiment of the present application provides a chip for implementing the method in any one of the first to second aspects or their respective implementations mentioned above. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the method in any one of the first to second aspects or their respective implementations mentioned above. In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium for storing a computer program, which enables a computer to execute the method of any aspect of the first to second aspects mentioned above or any of their implementations. In a ninth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which enable a computer to execute the method of any one of the first to second aspects mentioned above or any of their implementations. In a tenth aspect, an embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the method in any one of the first to second aspects mentioned above or in each of their implementations. In an embodiment of the present application, first indication information is introduced and designed to indicate whether the first network device supports terminal-to-terminal relay, that is, the first indication information can indicate whether the first network device has the ability to configure the first terminal device to perform terminal-to-terminal relay, which is equivalent to that the first indication information can be used to guide the first terminal device to obtain the relay configuration information of the first terminal device for terminal-to-terminal relay, thereby improving the communication performance of the first terminal device when performing terminal-to-terminal relay. BRIEF DESCRIPTION OF THE DRAWINGS FIG1 is a schematic diagram of mode A provided in the present application. FIG. 2 is a schematic diagram of mode B provided in the present application. FIG3 is a schematic diagram of unicast transmission provided by the present application. FIG. 4 is a schematic diagram of multicast transmission provided by the present application. FIG5 is a schematic diagram of broadcast transmission provided by the present application. FIG6 is a schematic diagram of a side feedback provided by the present application. FIG. 7 is an example of a system framework of terminal-to-network relay provided in the present application. FIG8 is a schematic flowchart of the configuration information acquisition method provided in the present application. FIG. 9 is another schematic flowchart of the configuration information forwarding method provided in the present application. FIG10 is a schematic block diagram of the first terminal device provided in the present application. FIG. 11 is a schematic block diagram of a second terminal device provided in the present application. FIG12 is a schematic block diagram of a communication device provided in the present application. FIG13 is a schematic block diagram of the chip provided in the present application. DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be noted that the terms used in the implementation method section of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. For example, the terms "predefined" or "preset" involved in the embodiments of this application can be implemented by pre-saving corresponding codes, tables or other methods that can indicate relevant information in a device (for example, including a terminal device and a network device), and this application does not limit its specific implementation method. For example, the preset may refer to a definition in a protocol. Optionally, "protocol" may refer to a standard protocol in the field of communications, such as LTE protocols, NR protocols, and related protocols used in future communication systems, and this application does not specifically limit this. In addition, the term "indication" can be a direct indication, an indirect indication, or an indication of an associated relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an associated relationship between A and B. The term "correspondence" can mean that there is a direct or indirect correspondence relationship between the two, or it can mean that there is an associated relationship between the two, or it can mean that there is an indication and being indicated, configuration and being configured, etc. In addition, the description "at..." involved in the embodiments of the present application can be interpreted as "if" or "if" or "when..." or "in response to". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)". In addition, in the embodiments of the present application, the term "and / or" is only a description of the associated relationship of associated objects, indicating that there can be three relationships. Specifically, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", etc. in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to illustrate non-exclusive inclusions. The technical solutions of the embodiments of the present application can be applied to various communication systems. Exemplarily, the communication systems to which the technical solutions of the embodiments of the present application can be applied include but are not limited to: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-based access to unlicensed spectrum, LTE-U) system, NR on unlicensed spectrum (NR-based access to unlicensed spectrum, NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity) system. Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc. The embodiments of the present application may be applicable to any terminal device to terminal device communication framework. Exemplarily, the embodiments of the present application may be applicable to communication frameworks such as device to device (D2D) communication, machine to machine (M2M) communication, machine type communication (MTC), vehicle to vehicle (V2V) communication, or vehicle to everything (V2X). The communication system to which the embodiments of the present application are applicable can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) networking scenario. The communication system of the present application may also be applied to unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; or, the communication system of the present application may also be applied to licensed spectrum, where the licensed spectrum may also be considered as an unshared spectrum. The present application describes various embodiments in conjunction with network devices and terminal devices. Exemplarily, the terminal device involved in the present application may be any device or apparatus configured with a physical layer and a media access control layer. For example, the terminal device involved in the present application may also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc. For another example, the terminal device involved in the present application may be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other linear processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolving Public Land Mobile Network (PLMN) network, etc. Wearable devices can also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. A wearable device is not only a hardware device, but also a function implemented through software support. In a broad sense, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring. For another example, the terminal device involved in the present application may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc. It is worth noting that the terminal equipment involved in this application can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (for example, on airplanes, balloons and satellites, etc.). Exemplarily, the network device involved in the present application may be a device for communicating with a terminal device. For example, the network equipment involved in the present application can provide services for a cell, that is, the terminal equipment communicates with the network equipment through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell may be a cell corresponding to the network equipment (for example, a base station). The cell may belong to a macro base station or a base station corresponding to a small cell. The small cell may include: a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services. For example, the network device can be an access point (AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device or base station (gNB) in an NR network, or a network device in a future evolved PLMN network, or a network device in an NTN network, etc. It is worth noting that the network device involved in the present application may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water. It should be understood that the terms "system" and "network" are often used interchangeably herein. To facilitate the understanding of the solution provided by the present application, the following is an exemplary description of the contents related to sideline communication. 1. LTE D2D / V2X. LTE D2D / V2X is a device-to-device sidelink (SL) communication technology. It is different from the way communication data is received or sent by network devices in traditional cellular systems. Since sidelink communication adopts terminal-to-terminal direct communication, it has higher spectrum efficiency and lower transmission delay. Exemplarily, LTE D2D / V2X may include the following two transmission modes: Mode A and Mode B. Mode A: The transmission resources of the terminal are allocated by the network device, and the terminal transmits data on the sidelink according to the resources allocated by the network device. For example, the network device may allocate resources for a single transmission to the terminal, or may allocate resources for a semi-static transmission to the terminal. FIG1 is a schematic diagram of mode A provided in the present application. As shown in Figure 1, terminal 1 and terminal 2 are located within the coverage of the network device, and the network device can allocate transmission resources to terminal 1 and terminal 2 respectively, that is, terminal 1 can send data on the side link according to the resources allocated by the network device to terminal 1, and terminal 2 can send data on the side link according to the resources allocated by the network device to terminal 2. Mode B: The terminal selects a resource in the resource pool for data transmission. For example, the terminal can autonomously select a transmission resource from a resource pool configured by the network for side transmission, or autonomously select a transmission resource from a pre-configured resource pool for side transmission. FIG. 2 is a schematic diagram of mode B provided in the present application. As shown in FIG. 2 , terminal 1 and terminal 2 are located within the coverage of the network device, and terminal 1 or terminal 2 can select a resource in the resource pool to transmit data. For example, LTE D2D / V2X can be divided into Proximity based Service (ProSe), Vehicle to everything (V2X), and Wearable Devices (FeD2D) based on application scenarios. ProSe: Mainly for public safety services. In ProSe, by configuring the location of resource pools in the time domain, for example, resource pools are discontinuous in the time domain, the terminal can send / receive data discontinuously on the sidelink, thereby achieving power saving. V2X: It is mainly aimed at the business of relatively high-speed vehicle-to-vehicle and vehicle-to-pedestrian communication. In V2X, since the on-board system has continuous power supply, power efficiency is not the main problem, but the delay of data transmission is the main problem. Therefore, the system design requires terminal devices to send and receive continuously. FeD2D: It is mainly aimed at scenarios where wearable devices access the network through mobile phones, and is mainly aimed at scenarios with low mobile speeds and low power access. In FeD2D, the base station can configure the discontinuous reception (DRX) parameters of the remote terminal through a relay terminal. Exemplarily, a multi-carrier mechanism may also be introduced in LTE V2X. Specifically, the multi-carrier mechanism is reflected in the fact that the terminal can support data packet segmentation and transmit data packets using multiple carriers, thereby improving the data transmission rate; accordingly, the receiving end can also be enhanced by using multi-carrier reception of data packets. For example, an identical data packet can be copied twice by means of data packet replication and sent using two carriers to improve transmission reliability. Specifically, for data packet replication: V2X sidelink communication supports sidelink packet replication and is executed at the Packet Data Convergence Protocol (PDCP) layer of the UE. For sidelink packet replication, the PDCP protocol data unit (PDU) is replicated at the PDCP entity. The replicated PDCP PDU of the same PDCP entity is submitted to two different Radio Link Control (RLC) entities and associated with two different sidelink logical channels respectively. The replicated PDCP PDU of the same PDCP entity is only allowed to be transmitted on different sidelink carriers. The terminal can activate or deactivate sidelink packet replication based on (pre) configuration. Sidelink packet replication is not applicable to devices with Rel-14 transmission profile (TS 23.285

[0072] ) transmission. PPPR values ​​supporting sidelink packet replication can be (pre-)configured via PPPR thresholds. For UE autonomous resource selection and scheduled resource allocation, the UE shall perform sidelink packet replication for data with configured PPPR values ​​until sidelink packet replication is deactivated for these PPPR values. For scheduled resource allocation, the UE reports the amount of data associated with one or more PPPR values ​​and the destination to which the data belongs via a sidelink Buffer Status Report (BSR). The mapping of PPPR values ​​to logical channel groups can be configured by the eNB and the PPPR value is reflected by the associated logical channel group ID included in the sidelink BSR. A list of one or more PPPR values ​​can be reported by a Radio Resource Control (RRC) connected UE in the sidelink UE information. 2. NR V2X. Based on LTE V2X, NR V2X is not limited to broadcast scenarios, but is further expanded to unicast and multicast scenarios. That is to say, in LTE-V2X, broadcast transmission mode is supported, and in NR-V2X, unicast and multicast transmission modes are introduced. For unicast transmission, there is only one receiving terminal. Figure 3 is a schematic diagram of unicast transmission provided by the present application. As shown in Figure 3, unicast transmission is performed between terminal 1 and terminal 2. For multicast transmission, the receiving end is all terminals in a communication group, or all terminals within a certain transmission distance. Figure 4 is a schematic diagram of multicast transmission provided by the present application. As shown in Figure 4, terminal 1, terminal 2, terminal 3 and terminal 4 constitute a communication group, in which terminal 1 sends data, and other terminal devices in the group are receiving terminals. For broadcast transmission, the receiving end is any terminal around the sending terminal. Figure 5 is a schematic diagram of broadcast transmission provided by the present application. As shown in Figure 5, terminal 1 is the sending terminal, and the other terminals around it, namely terminal 2-terminal 6, are all receiving terminals. Similar to LTE V2X, NR V2X can also define two resource authorization modes: Mode 1 and Mode 2. Furthermore, the terminal may also be in a mixed mode, that is, it can use mode 1 to acquire resources and mode 2 to acquire resources at the same time. The resource acquisition is indicated by a sidelink grant, that is, the sidelink grant indicates the time-frequency position of the corresponding physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) resources. In addition, similar to LTE V2X, in NR V2X, since the on-board system has continuous power supply, power efficiency is not the main issue, but the delay of data transmission is the main issue, so the system design requires the terminal equipment to perform continuous transmission and reception. In addition, in NR-V2X, a side feedback channel is introduced to improve reliability. Exemplarily, the side feedback can be activated or deactivated by pre-configuration information or network configuration information, and can also be activated or deactivated by the transmitting terminal. If the side feedback is activated, the receiving end receives the side data sent by the transmitting end, and feeds back ACK or NACK to the transmitting end according to the detection result; accordingly, the transmitting end decides to send retransmitted data or new data based on the feedback information of the receiving end; if the side feedback is deactivated, the receiving end does not need to send feedback information, and the transmitting end usually sends data in a blind retransmission manner. For example, the transmitting terminal repeats each side data K times, instead of deciding whether to send retransmitted data based on the feedback information of the receiving end. The use scenarios of side feedback are not limited to unicast communication, but also include multicast communication. FIG6 is a schematic diagram of a side feedback provided by the present application. As shown in Figure 6, for unicast transmission, the transmitter sends sidelink data (including physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH)) to the receiving terminal, and the receiving terminal sends hybrid automatic repeat request (HARQ) feedback information (including positive acknowledgment (ACK) or negative acknowledgment (NACK)) to the transmitting terminal, and the transmitting terminal determines whether retransmission is required based on the feedback information of the receiving terminal. Among them, the HARQ feedback information is carried in the sidelink feedback channel, such as PSFCH. Exemplarily, the terminal triggers the sidelink RRC reconfiguration process in the following scenarios: releasing sidelink data bearers in unicast communications; Establishing a sidelink data bearer in unicast communication; Modifying the configuration of the sidelink data bearer in unicast communication; In the terminal-to-network relay scenario, release the PC5 relay RLC channel between the relay terminal and the remote terminal; In the terminal-to-network relay scenario, a PC5 relay RLC channel is established between the relay terminal and the remote terminal; In the terminal-to-network relay scenario, modify the configuration parameters related to the PC5 relay RLC channel between the relay terminal and the remote terminal; Reconfiguration of NR sidelink measurement reporting related parameters; Reconfiguration of sidelink channel state information (CSI) reference signal resources and CSI reporting delay boundaries; Reconfiguration of line link DRX on the opposite terminal side. It should be understood that the relay terminal involved in the present application can be implemented as a layer 2 relay or a layer 3 relay terminal. Among them, layer 2 uses the link of layer 1 to complete the transmission of application data of layer 3. Layer 3 is used to transmit control messages; for example, layer 3 may include the Internet Protocol (IP) layer and the Radio Resource Control (RRC) layer, as well as the Non-Access Stratum (NAS). Layer 2 is used to provide correct transmission and reception of signaling messages, as well as partial duplication detection; for example, layer 2 may include the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer, etc. Layer 1 is used to provide a transmission and reception wireless link between a base station and a terminal device; for example, layer 1 may include a physical layer. Among them, the PDCP layer can be used to process RRC messages on the control plane and Internet Protocol (IP) packets on the user plane; on the user plane, after the PDCP layer obtains the IP data packet from the upper layer, it can compress and encrypt the IP data packet header and then submit it to the RLC layer. The RLC layer can be used to provide segmentation and retransmission services for user and control data, and then submit it to the MAC layer; the functions of the RLC layer can be implemented by the RLC entity, and an RLC entity can be configured in any of the following three modes: Transparent Mode (TM), Unacknowledged Mode (UM) and Acknowledged Mode (AM). Among them, the AM mode provides all RLC functions and can effectively improve the reliability of data transmission through error detection and retransmission. The MAC layer is mainly responsible for the mapping between logical channels and transport channels; when sending data, the MAC layer can determine in advance whether the data can be sent. If it can be sent, it will add some control information to the data, and finally send the data and control information to the physical layer in a specified format. The physical layer is used to transmit all information from the MAC transport channel through the air interface. It is mainly responsible for: link adaptation (AMC) that requires care, power control, cell search (for the purpose of initial synchronization and handover), and other measurements of the radio resource control layer. 3. Terminal to network relay. For terminal-to-network relay, the remote terminal accesses the network through a relay terminal with relay function, the remote terminal and the relay terminal are connected through a side link, and the relay terminal transmits data between the remote terminal and the network. FIG. 7 is an example of a system framework 100 of a terminal-to-network relay provided by the present application. As shown in Fig. 7, the system framework 100 may include a remote terminal 110, a relay terminal 120, an access network device 130, a core network device 140, and an application server (AS) 150. The remote terminal 110 may be connected to the relay terminal 120 via a PC5 interface, and the relay terminal 120 may be connected to the access network device 130 via a Uu interface, thereby being connected to the core network device 140, and the core network device 140 may be connected to the AS 150 via an N6 interface. Among them, the remote terminal 110 and the relay terminal 120 may be terminal devices that have been authenticated by the network when there is network coverage. The remote terminal 110 may be a terminal device that is authenticated as being able to access the wireless network through the relay terminal. In other words, the remote terminal 110 is authorized to be a remote user equipment (Remote UE). The relay terminal 120 may be a terminal device that is authenticated as being able to work as a relay node. Both the remote terminal 110 and the relay terminal 120 may be authorized to send and receive messages related to relay discovery, and the messages related to relay discovery may include discovery messages and discovery request messages. Before transmitting data, the remote terminal 110 needs to use the discovery process to discover a suitable relay terminal (such as the relay terminal 120) and establish a PC5 connection with it. After the discovery process, a PC5 connection is established between the relay terminal and the remote terminal. The relay discovery process may include a discovery process of Model A or Model B. In the discovery process of Model A, the relay terminal 120 actively broadcasts the relay service code (RSC) supported by the relay terminal 120, and the remote terminal 110 does not need to feedback a response message. RSC can be used to determine whether the relay terminal 120 can provide relay services. In the discovery process of Model B, the remote terminal 110 first broadcasts the RSC required by the remote terminal 110. If there are relay terminals (such as the relay terminal 120) around that can support the RSC required by the remote terminal 110, the relay terminal (such as the relay terminal 120) that can support the RSC required by the remote terminal 110 replies to the remote terminal 110 response message. Exemplarily, the remote terminal 110 may support an end-to-end protocol stack, which may include a Packet Data Convergence Protocol (PDCP) layer of a 3GPP PC5 interface and an upper protocol layer above the PDCP layer, and the upper protocol layer may include a user plane protocol layer and a control plane protocol layer. The user plane protocol layer includes, but is not limited to, a Service Data Adaptation Protocol (SDAP) layer and an Internet Protocol (IP) layer, and the control plane protocol layer includes, but is not limited to, a Radio Resource Control (RRC) layer and a Non-Access Stratum (NAS). In addition, the remote terminal 110 and the relay terminal 120 may support a point-to-point protocol stack, which may include: a Layer 2 (L2) protocol stack and a Layer 1 (L1) protocol stack of a 3GPP PC5 interface. The layer 2 protocol stack is used to provide correct transmission and reception of signaling messages, as well as partial duplication detection; for example, the layer 2 protocol stack may include a packet data convergence protocol (PDCP) layer, a radio link layer control protocol (RLC) layer, and a media access control (MAC) layer, etc. The layer 1 protocol stack is used to provide a transmission and reception wireless link between a base station and a terminal device; for example, the layer 1 protocol stack may include a physical layer. In addition, the relay terminal 120 may be provided with a relay protocol layer. The function of the relay protocol layer may be used to transmit data packets and related control information between remote terminals through the relay terminal. Exemplarily, the relay protocol layer can be implemented as a terminal-to-network relay function of a layer 2 relay, and layer 2 is used to provide correct transmission and reception of signaling messages, including partial duplication detection. For example, layer 2 may include a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer, a radio link layer control protocol (Radio Link Control, RLC) layer, and a media access control (Media Access Control, MAC) layer, etc. That is, the remote terminal accesses the network through a relay terminal with a layer 2 relay function, and the relay terminal carries the functions below the access layer (Access Stratum, AS) and the RLC layer. The relay terminal with a layer 2 relay function transmits data between the remote terminal and the network, and the remote terminal and the relay terminal are connected via a side link. Exemplarily, the relay protocol layer can be implemented as a terminal-to-network relay function of a layer 3 relay, and layer 3 is used to transmit control messages. For example, layer 3 may include an Internet Protocol (IP) layer and a Radio Resource Control (RRC) layer, as well as a non-access layer (NAS). The remote terminal accesses the network through a relay terminal with a layer 3 relay function, for example, the relay terminal assumes the function of an IP layer relay. Specifically, the relay terminal with a layer 3 relay function transmits data between the remote terminal and the network, and the remote terminal and the relay terminal are connected via a side link. It should be understood that the remote terminal 110 and the relay terminal 120 involved in the present application can be the terminal devices involved above, the access network device 130 can be the network device involved above, and the core network device 140 includes but is not limited to: Access and Mobility Management Function (AMF), Authentication Server Function (AUSF), User Plane Function (UPF) Session Management Function (SMF). For example, the core network device 140 can be a 5G core network (5G Core, 5GC) device, or it can be an Evolved Packet Core (EPC) device of an LTE network. It should be understood that in other alternative embodiments, a new network entity can also be formed by dividing the network elements in the core network device 140, and this embodiment of the present application is not limited to this. Of course, the system framework 100 can also be applicable to other 3GPP communication systems, such as 4G communication systems, or future 3GPP communication systems, and AS 150 can also be other terminal devices or external public safety Internet. Exemplarily, the remote terminal 110 may be used to measure the sideline reporting information and report it. The sidelink reporting information may include information such as the identifier of the relay terminal, the identifier of the serving cell, and the reference signal receiving power (RSRP) measurement value. When the remote terminal 110 performs a link switch from a non-direct path to a direct path, for the relay terminal, the sidelink reference signal receiving power (SL-RSRP) is preferentially used for sidelink measurement; when the remote terminal performs a link switch from a direct path to a non-direct path, the sidelink data reference signal receiving power (SD-RSRP) is preferentially used for sidelink measurement. In addition, when the remote terminal 110 performs measurement reporting, two new measurement reporting triggering events may be defined for the relay switching from the terminal to the network. For the measurement reporting triggered based on event 1, when the link quality of the relay terminal is lower than the configured threshold value, the remote terminal 110 performs measurement reporting. For example, when the link quality of the relay terminal is lower than the configured threshold value and the link quality of the neighboring cell is higher than the configured threshold value, the remote terminal 110 performs measurement reporting. For measurement reporting triggered based on event 2, the remote terminal performs measurement reporting when the link quality of the serving cell is lower than the configured threshold value. For example, when the link quality of the serving cell is lower than the configured threshold value and the link quality of the relay terminal is higher than the configured threshold value, the remote terminal 110 performs measurement reporting. Exemplarily, in order to assist the remote terminal in performing the switch from the direct link to the non-direct link, a new timer can also be introduced. When the remote terminal receives an RRC reconfiguration message indicating the switch from the direct link to the non-direct link, the remote terminal starts the timer; if the timer times out, the remote terminal performs RRC re-establishment. Exemplarily, for the terminal-to-network relay, the system broadcast message sent by the network device may include a layer 2 relay / layer 3 relay capability indication. Specifically, for the terminal-to-network relay, sl-L2U2N-Relay may be used to indicate whether the network device supports layer 2 relay, sl-NonRelayDiscovery may be used to indicate whether the network device supports the terminal device to send non-relay discovery messages, and sl-L3U2N-RelayDiscovery may be used to indicate whether the network device supports the terminal device to send layer 3 relay or relay discovery messages. The format of the layer 2 relay / layer 3 relay capability indication may be as follows: It is worth noting that for terminal-to-terminal relay and terminal-to-network relay, the source remote terminal accesses the target remote terminal through a relay terminal with relay function, the source remote terminal, the relay terminal and the target remote terminal are connected through a side link, and the relay terminal transmits data between the source remote terminal and the target remote terminal. However, how the relay terminal and the remote terminal implement terminal-to-terminal relay, for example, how the relay terminal and the remote terminal obtain relay configuration information for terminal-to-terminal relay, is a technical problem that needs to be solved in this field. In view of this, the present application provides a configuration information acquisition method, a configuration information forwarding method and a terminal device, which can improve the communication performance of terminal-to-terminal relay. FIG8 is a schematic flow chart of a configuration information acquisition method 200 provided in the present application. The configuration information acquisition method 200 may be executed by a first terminal device. The first terminal device may be a remote terminal or a relay terminal. For example, the configuration information acquisition method 200 may be executed by a remote terminal or a relay terminal for terminal-to-terminal communication. As shown in FIG8 , the configuration information acquisition method 200 may include: S210, a first terminal device receives first indication information sent by a first network device, where the first indication information indicates whether the first network device supports terminal-to-terminal relay. Exemplarily, the first indication information indicating whether the first network device supports terminal-to-terminal relay can be understood as: the first indication information can indicate whether the first network device has the ability to configure the first terminal device for terminal-to-terminal relay, which is equivalent to that the first indication information can be used to guide the first terminal device to obtain the relay configuration information of the first terminal device for terminal-to-terminal relay. For example, when the first indication information indicates that the first network device supports terminal-to-terminal relay, the first indication information instructs the first terminal device to obtain the relay configuration information from the first network device. For another example, when the first indication information indicates that the first network device does not support terminal-to-terminal relay, the first indication information is used to guide the first terminal device to obtain the relay configuration information from other devices other than the first network device (for example, a second terminal device that establishes a relay connection with the first terminal device). S220: The first terminal device obtains relay configuration information for the terminal-to-terminal relay based on the first indication information. Exemplarily, the relay configuration information may be layer 2 relay configuration information, that is, the relay configuration information may be used for terminal-to-terminal relay at layer 2, and layer 2 is used to provide correct transmission and reception of signaling messages, including partial duplication detection. For example, layer 2 may include a packet data convergence protocol (PDCP) layer, a radio link layer control protocol (RLC) layer, and a media access control (MAC) layer, etc. That is, the remote terminal accesses the network through a relay terminal with a layer 2 relay function, and the relay terminal carries functions below the access stratum (AS) and the RLC layer. The remote terminal (including the source remote terminal and the target remote terminal) and the relay terminal are connected via a side link, and the relay terminal with a layer 2 relay function transfers data between the source remote terminal and the target remote terminal. Exemplarily, the relay configuration information may be layer 3 relay configuration information, that is, the relay configuration information may be used for terminal-to-terminal relay at layer 3, and layer 3 is used to transmit control messages. For example, layer 3 may include the Internet Protocol (IP) layer and the Radio Resource Control (RRC) layer, as well as the non-access layer (NAS). The remote terminal accesses the network through a relay terminal with a layer 3 relay function, for example, the relay terminal assumes the function of an IP layer relay. Specifically, the remote terminal (including the source remote terminal and the target remote terminal) and the relay terminal are connected via a side link, and the relay terminal with a layer 3 relay function transmits data between the source remote terminal and the target remote terminal. Exemplarily, the relay configuration information may include configuration information of resources used for terminal-to-terminal relay. For example, configuration information of a resource pool used for terminal-to-terminal relay. Of course, other configuration information for terminal-to-terminal relay may also be included, and this application does not specifically limit this. In an embodiment of the present application, first indication information is introduced and designed to indicate whether the first network device supports terminal-to-terminal relay, that is, the first indication information can indicate whether the first network device has the ability to configure the first terminal device to perform terminal-to-terminal relay, which is equivalent to that the first indication information can be used to guide the first terminal device to obtain the relay configuration information of the first terminal device for terminal-to-terminal relay, thereby improving the communication performance of the first terminal device when performing terminal-to-terminal relay. In some embodiments, the first indication information indicates that the first network device supports the terminal-to-terminal relay, and S220 may include: The relay configuration information is obtained from the first network device. Exemplarily, when the first indication information indicates that the first network device supports terminal-to-terminal relay, it means that the first indication information indicates that the first network device has the ability to configure the first terminal device to perform terminal-to-terminal relay. At this time, the first terminal device can obtain the relay configuration information of the first terminal device for terminal-to-terminal relay from the first network device. In some embodiments, the first indication information indicates that the first network device does not support the terminal-to-terminal relay, and S220 may include: The relay configuration information is obtained from a second terminal device that establishes a relay connection with the first terminal device. Exemplarily, when the first indication information indicates that the first network device does not support terminal-to-terminal relay, it means that the first indication information indicates that the first network device does not have the ability to configure the first terminal device for terminal-to-terminal relay. At this time, the first terminal device can obtain the relay configuration information of the first terminal device for terminal-to-terminal relay from other devices other than the first network device (for example, a second terminal device that establishes a relay connection with the first terminal device). In some embodiments, when the first indication information indicates that the first network device supports the terminal-to-terminal relay, the first indication information also indicates at least one of the following: the relay service type supported by the first network device, and the terminal type supported by the first network device for the terminal-to-terminal relay. Exemplarily, when the first indication information indicates that the first network device supports the terminal-to-terminal relay, it means that the first indication information indicates that the first network device has the ability to configure the first terminal device to perform terminal-to-terminal relay. At this time, the first indication information can also indicate the relay service type supported for configuration and the terminal type supported for configuration of the terminal-to-terminal relay. The relay service type supported by the first network device can be understood as: the relay service type supported by the first network device for configuration, and the terminal type supported by the first network device for the terminal-to-terminal relay can be understood as: the terminal type supported by the first network device for configuration of the terminal-to-terminal relay. In some embodiments, the terminal type of the first terminal device is a terminal type supported by the first network device for the terminal-to-terminal relay, and the type of the relay service that the first terminal device expects to transmit is a relay service type supported by the first network device, and S220 may include: The first terminal device obtains the relay configuration information from the first network device. Exemplarily, if the terminal type of the first terminal device is a terminal type supported by the first network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is a relay service type supported by the first network device, it means that the first network device has the ability to configure the relay configuration information for the first terminal device. At this time, the first terminal device can obtain the relay configuration information from the first network device. In some embodiments, the terminal type of the first terminal device is different from the terminal type supported by the first network device for the terminal-to-terminal relay, and / or the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the first network device; S220 may include: The first terminal device obtains the relay configuration information from a second terminal device that establishes a connection with the first terminal device. Exemplarily, the terminal type of the first terminal device is different from the terminal type supported by the first network device for the terminal-to-terminal relay, and / or the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the first network device; indicating that the first network device does not have the ability to configure the relay configuration information for the first terminal device. At this time, the first terminal device can obtain the relay configuration information from a second terminal device that establishes a connection with the first terminal device. In some embodiments, the relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service. Exemplarily, the layer 2 terminal-to-terminal relay service may refer to a service that uses layer 2 to perform terminal-to-terminal relay. Exemplarily, the layer 3 terminal-to-terminal relay service may refer to a service that uses layer 3 to perform terminal-to-terminal relay. Exemplarily, the relay discovery service may refer to a service for relay discovery, including but not limited to sending and receiving discovery messages and discovery request messages for relay discovery. Exemplarily, the non-relay discovery service may refer to a service not used for relay discovery, including, for example, but not limited to, sending and receiving discovery messages and discovery request messages not used for relay discovery. In some embodiments, the relay discovery service includes at least one of the following: a layer 2 relay discovery service, a layer 3 relay discovery service. Exemplarily, the layer 2 relay discovery service may refer to a service for layer 2 relay discovery, including but not limited to sending and receiving a discovery message and a discovery request message for layer 2 relay discovery. Exemplarily, the layer 3 relay discovery service may refer to a service for layer 3 relay discovery, including but not limited to sending and receiving discovery messages and discovery request messages for layer 3 relay discovery. In some embodiments, the terminal types supported by the first network device for the terminal-to-terminal relay include at least one of the following: a remote terminal, a relay terminal. Exemplarily, if the terminal type supported by the first network for the terminal-to-terminal relay is a remote terminal, then when the first terminal device is a remote terminal, it means that the first network device has the ability to configure the relay configuration information for the first terminal device, and the first terminal device can obtain the relay configuration information from the first network device; if the terminal type supported by the first network for the terminal-to-terminal relay does not include a remote terminal, then when the first terminal device is a remote terminal, it means that the first network device does not have the ability to configure the relay configuration information for the first terminal device, and the first terminal device can obtain the relay configuration information from a second terminal device that establishes a connection with the first terminal device. Exemplarily, if the terminal type supported by the first network for the terminal-to-terminal relay is a relay terminal, then when the first terminal device is a relay terminal, it means that the first network device has the ability to configure the relay configuration information for the first terminal device, and the first terminal device can obtain the relay configuration information from the first network device; if the terminal type supported by the first network for the terminal-to-terminal relay does not include a relay terminal, then when the first terminal device is a relay terminal, it means that the first network device does not have the ability to configure the relay configuration information for the first terminal device, and the first terminal device can obtain the relay configuration information from a second terminal device that has established a connection with the first terminal device. In some embodiments, the remote terminal includes at least one of the following: a source remote terminal, a target remote terminal. In some embodiments, when the first terminal device obtains the relay configuration information from a second terminal device that establishes a relay connection with the first terminal device, it can first send a first request to the second terminal device, where the first request is used to request to obtain the relay configuration information; and then receive the relay configuration information or a rejection response message sent by the second terminal device, where the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device. Exemplarily, if the first indication information indicates that the first network device does not support terminal-to-terminal relay, the first terminal device may first establish a relay connection with the second terminal device, and then send the first request to the second terminal device. Of course, the first terminal device may also establish a relay connection with the second terminal device before receiving the first indication information. Based on this, when the first terminal device receives the first indication information and the first indication information indicates that the first network device does not support terminal-to-terminal relay, the first terminal device sends the first request to the second terminal device. In some embodiments, the first request is carried in at least one of the following messages: a PC5 Radio Resource Control (RRC) message, a PC5 sideline message, a sideline (SL) Media Access Control (MAC) control element (CE). Exemplarily, the first request may be carried in a broadcast message, a unicast message, or a multicast message. In some embodiments, the relay configuration information or the rejection response message is carried in at least one of the following messages: PC5RRC message, PC5 sideline message, SL MAC CE. Exemplarily, the relay configuration information or the rejection response message may be carried in a broadcast message, a unicast message, or a multicast message. In some embodiments, the first request includes a reason value indicating the reason for requesting the relay configuration information. Exemplarily, the reason value in the first request may indicate that the first terminal device cannot obtain the relay configuration information from the first network device to which it belongs, or the reason value in the first request may indicate that the first network device does not support terminal-to-terminal relay, or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for the first terminal device; or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for a terminal device whose terminal type is the first terminal device; or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for a relay service type whose relay service type is the first terminal device. In some embodiments, the second terminal device includes at least one of the following terminals: a source remote terminal, a target remote terminal, and a relay terminal. In some embodiments, the first terminal device includes at least one of the following terminals: a source remote terminal, a target remote terminal, and a relay terminal. Exemplarily, if the second terminal device is a source remote terminal or a target remote terminal, the first terminal device is a relay terminal. Exemplarily, if the second terminal device is a relay terminal, the first terminal device is a source remote terminal or a target remote terminal. In some embodiments, the first terminal device is in an RRC idle state or an RRC deactivated state, and the first terminal device can obtain the relay configuration information from a system message sent by the first network device. In some embodiments, the first terminal device is in an RRC connected state, and the first terminal device can obtain the relay configuration information from the RRC configuration information sent by the first network device. Exemplarily, the system message may be referred to as a broadcast message or system information (SI). Exemplarily, the system message includes, but is not limited to: a system information block (System Information Block, SIB), a master information block (Master Information Block, MIB), or remaining system information (Remaining System Information, RMSI). It is worth noting that the Radio Resource Control (RRC) state of the first terminal device may include: RRC deactivation (RRC_INACTIVE) state, RRC idle (RRC_IDLE) state and RRC connected (RRC_CONNECTED) state. RRC deactivation may also be referred to as RRC inactive state. Among them, for the RRC_CONNECTED state, there is an RRC connection between the first network device and the first terminal device, and there is a UE AS context between the first network device and the first terminal device, that is, the first network device knows that the location of the first terminal device is at a specific cell level, and the mobility of the first terminal device is controlled by the first network device, and unicast data can be transmitted between the first network device and the first terminal device. For the RRC_IDLE state, there is no UE access stratum (Access Stratum, AS) context on the first network device side, and there is no RRC connection. The mobility of the first terminal device is based on cell selection and reselection. The paging of the first terminal device is initiated by the core network (Core Network, CN), and its paging area is configured by CN. For the RRC_INACTIVE state, there is a connection between CN-NR, the UE AS context exists on a certain base station, the mobility of the first terminal device is based on cell selection and reselection, the paging of the first terminal device is triggered by the radio access network (Radio Access Network, RAN), and its paging area is managed by RAN. The first network device knows that the location of the first terminal device is based on the paging area level of RAN. In addition, the first terminal device can switch or convert between various RRC states. For example, a UE in the RRC_CONNECTED state can enter the RRC_IDLE state by releasing the RRC connection; a UE in the RRC_IDLE state can enter the RRC_CONNECTED state by establishing an RRC connection; a UE in the RRC_CONNECTED state can enter the RRC_INACTIVE state by suspending (Release with Suspend) the RRC connection; a UE in the RRC_INACTIVE state can enter the RRC_CONNECTED state by resuming (Resume) the RRC connection, and of course, it can also enter the RRC_IDLE state by releasing the RRC connection. In some embodiments, the first indication information includes a Boolean type parameter. Exemplarily, the value of the Boolean type parameter includes only two values, one of which may indicate that the condition is met, and the other may indicate that the condition is not met. In conjunction with this embodiment, one of the values ​​may indicate that the first network device supports terminal-to-terminal relay, and the other may indicate that the first network device does not support terminal-to-terminal relay. In some embodiments, the method 200 may further include: The first terminal device receives the second indication information sent by the first network device, and the second indication information indicates whether the first network device supports the first terminal device to forward the relay configuration information to the opposite terminal. In other words, the second indication information indicates whether the first network device allows the first terminal device to forward the relay configuration information to the opposite terminal. Exemplarily, when the second indication information indicates that the first network device supports the first terminal device forwarding the relay configuration information to the opposite terminal, the first terminal device can forward the relay configuration information to the terminal device that establishes a relay connection with the first terminal device; when the second indication information indicates that the first network device does not support the first terminal device forwarding the relay configuration information to the opposite terminal, the first terminal device is prohibited from forwarding the relay configuration information to the terminal device that establishes a relay connection with the first terminal device. In some embodiments, the counterpart terminal includes at least one of the following: a relay terminal, a remote terminal. In some embodiments, the second indication information includes a Boolean type parameter. Exemplarily, the value of the Boolean type parameter includes only two values, one of which may indicate that the condition is met, and the other may indicate that the condition is not met. In conjunction with this embodiment, one of the values ​​may indicate that the first network device supports the first terminal device to forward the relay configuration information to the opposite terminal, and the other value may indicate that the first network device does not support the first terminal device to forward the relay configuration information to the opposite terminal. The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the embodiments mentioned above. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present application. For example, the various specific technical features described in the specific embodiments mentioned above can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further explain various possible combinations. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the ideas of the present application, they should also be regarded as the contents disclosed in the present application. It should also be understood that in the various method embodiments of the present application, the size of the serial numbers of the processes involved above does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above describes in detail the configuration information acquisition method provided according to the embodiment of the present application from the perspective of the first terminal device. The following will describe the configuration information forwarding method provided according to the embodiment of the present application from the perspective of the second terminal device in combination with Figure 9. FIG9 is a schematic flow chart of a configuration information forwarding method 300 provided in the present application. The configuration information forwarding method 300 may be executed by a second terminal device. The second terminal device may be a remote terminal or a relay terminal. For example, the configuration information forwarding method 300 may be executed by a remote terminal or a relay terminal for terminal-to-terminal communication. As shown in FIG. 9 , the configuration information forwarding method 300 may include: S310, the second terminal device receives a first request sent by the first terminal device, where the first request is used to request to obtain relay configuration information for terminal-to-terminal relay; S320, the second terminal device performs a reselection operation of the relay terminal or sends the relay configuration information or a rejection response message to the first terminal device, and the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device. In this embodiment, the second terminal device can trigger the reselection operation of the relay terminal of the second terminal device by responding to the first request sent by the first terminal device, or trigger the second terminal device to send the relay configuration information or the rejection response message to the first terminal device, thereby improving the communication process of the terminal-to-terminal relay and further improving the communication performance of the terminal-to-terminal relay. In some embodiments, the relay configuration information or the rejection response message is carried in at least one of the following messages: PC5RRC message, PC5 sideline message, SL MAC CE. Exemplarily, the relay configuration information or the rejection response message may be carried in a broadcast message, a unicast message, or a multicast message. In some embodiments, the first terminal device is a relay terminal; or when the first terminal device is not a relay terminal, the second terminal device sends the relay configuration information or the rejection response message to the first terminal device. Exemplarily, if the first terminal device is a relay terminal, the second terminal device performs a relay terminal reselection operation or sends the relay configuration information or a rejection response message to the first terminal device; otherwise, the second terminal device sends the relay configuration information or the rejection response message to the first terminal device. Exemplarily, if the first terminal device is a relay terminal, it means that the second terminal device can use the first terminal device as the relay terminal of the second terminal device, or select other terminal devices as the relay terminal of the second terminal device. If other terminal devices are selected as the relay terminal of the second terminal device, the relay terminal reselection operation can be performed; if the first terminal device continues to be used as the relay terminal of the second terminal device, the relay configuration information or the rejection response message can be sent to the first terminal device. Exemplarily, if the first terminal device is a remote terminal, it means that the second terminal device is a relay terminal. At this time, in order to cooperate with the relay communication of the first terminal device, the second terminal device can send the relay configuration information or the rejection response message to the first terminal device. In some embodiments, before S320, the method 300 may further include: The second terminal device receives third indication information sent by the second network device, where the third indication information indicates whether the second network device supports terminal-to-terminal relay; wherein S320 may include: The second terminal device sends the relay configuration information or the rejection response message to the first terminal device based on the third indication information. Exemplarily, the third indication information indicating whether the second network device supports terminal-to-terminal relay can be understood as follows: the third indication information can indicate whether the second network device has the ability to configure the second terminal device for terminal-to-terminal relay, which is equivalent to that the third indication information can be used to guide the second terminal device to obtain the relay configuration information of the second terminal device for terminal-to-terminal relay. For example, when the third indication information indicates that the second network device supports terminal-to-terminal relay, the third indication information instructs the second terminal device to obtain the relay configuration information from the second network device. For another example, when the third indication information indicates that the second network device does not support terminal-to-terminal relay, the third indication information is used to guide the second terminal device to obtain the relay configuration information from other devices other than the first network device (for example, a terminal device that establishes a relay connection with the second terminal device). In some embodiments, the third indication information indicates that the second network device supports the terminal-to-terminal relay, and the second terminal device sends the relay configuration information to the first terminal device. Exemplarily, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, it means that the third indication information indicates that the second network device has the ability to configure the second terminal device to perform terminal-to-terminal relay. At this time, the second terminal device can obtain the relay configuration information from the second network device and forward it to the first terminal device. In some embodiments, the third indication information indicates that the second network device does not support the terminal-to-terminal relay, and the second terminal device sends the rejection response message to the first terminal device. Exemplarily, when the third indication information indicates that the second network device does not support the terminal-to-terminal relay, it means that the third indication information indicates that the second network device does not have the ability to configure the second terminal device to perform terminal-to-terminal relay. At this time, the second terminal device can directly send the rejection response message to the first terminal device. In some embodiments, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, the third indication information also indicates at least one of the following: the relay service type supported by the second network device, and the terminal type supported by the second network device for the terminal-to-terminal relay. Exemplarily, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, it means that the third indication information indicates that the second network device has the ability to configure the second terminal device to perform terminal-to-terminal relay. At this time, the third indication information can also indicate the relay service type supported for configuration and the terminal type supported for configuration of the terminal-to-terminal relay. The relay service type supported by the second network device can be understood as: the relay service type supported by the second network device for configuration, and the terminal type supported by the second network device for the terminal-to-terminal relay can be understood as: the terminal type supported by the second network device for configuration of the terminal-to-terminal relay. In some embodiments, the terminal type of the first terminal device is the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is the relay service type supported by the second network device, and the second terminal device sends the relay configuration information to the first terminal device. Exemplarily, if the terminal type of the first terminal device is the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is the relay service type supported by the second network device, it means that the second network device has the ability to configure the relay configuration information for the first terminal device. At this time, the second terminal device can obtain the relay configuration information from the second network device and forward it to the first terminal device. In some embodiments, the terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the second network device; the second terminal device sends the rejection response message to the first terminal device. Exemplarily, the terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the second network device, indicating that the second network device does not have the ability to configure the relay configuration information for the first terminal device. At this time, the second terminal device can directly send the rejection response message to the first terminal device. In some embodiments, the relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service. Exemplarily, the layer 2 terminal-to-terminal relay service may refer to a service that uses layer 2 to perform terminal-to-terminal relay. Exemplarily, the layer 3 terminal-to-terminal relay service may refer to a service that uses layer 3 to perform terminal-to-terminal relay. Exemplarily, the relay discovery service may refer to a service for relay discovery, including but not limited to sending and receiving discovery messages and discovery request messages for relay discovery. Exemplarily, the non-relay discovery service may refer to a service not used for relay discovery, including, for example, but not limited to, sending and receiving discovery messages and discovery request messages not used for relay discovery. In some embodiments, the relay discovery service includes at least one of the following: a layer 2 relay discovery service, a layer 3 relay discovery service. Exemplarily, the layer 2 relay discovery service may refer to a service for layer 2 relay discovery, including but not limited to sending and receiving a discovery message and a discovery request message for layer 2 relay discovery. Exemplarily, the layer 3 relay discovery service may refer to a service for layer 3 relay discovery, including but not limited to sending and receiving discovery messages and discovery request messages for layer 3 relay discovery. In some embodiments, the terminal types supported by the second network device for the terminal-to-terminal relay include at least one of the following: a remote terminal, a relay terminal. Exemplarily, if the terminal type supported by the second network for the terminal-to-terminal relay is a remote terminal, then when the first terminal device is a remote terminal, it means that the second network device has the ability to configure the relay configuration information for the first terminal device, and the second terminal device can obtain the relay configuration information from the second network device and forward it to the first terminal device; if the terminal type supported by the second network for the terminal-to-terminal relay does not include a remote terminal, then when the first terminal device is a remote terminal, it means that the second network device does not have the ability to configure the relay configuration information for the first terminal device, and the second terminal device can directly send the rejection response message to the first terminal device. Exemplarily, if the terminal type supported by the second network for the terminal-to-terminal relay is a relay terminal, then when the first terminal device is a relay terminal, it means that the second network device has the ability to configure the relay configuration information for the first terminal device, and the second terminal device can obtain the relay configuration information from the second network device and forward it to the first terminal device; if the terminal type supported by the second network for the terminal-to-terminal relay does not include a relay terminal, then when the first terminal device is a relay terminal, it means that the second network device does not have the ability to configure the relay configuration information for the first terminal device, and the second terminal device can directly send the rejection response message to the first terminal device. In some embodiments, the remote terminal includes at least one of the following: a source remote terminal, a target remote terminal. In some embodiments, before S320, the method 300 may further include: The second terminal device obtains fourth indication information sent by the second network device, where the fourth indication information indicates whether the second network device supports the second terminal device to forward the relay configuration information to the opposite terminal; wherein S320 may include: The second terminal device sends the relay configuration information or the rejection response message to the first terminal device based on the fourth indication information. In other words, the fourth indication information indicates whether the second network device allows the second terminal device to forward the relay configuration information to the opposite terminal. In some embodiments, when the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the relay configuration information to the first terminal device; when the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the rejection response message to the first terminal device. Exemplarily, when the fourth indication information indicates that the second network device supports the second terminal device to forward the relay configuration information to the opposite terminal, it means that the second network device has the ability to configure terminal-to-terminal relay to other terminals (for example, the first terminal device) through the second terminal device. At this time, the second terminal device can obtain the relay configuration information from the second network device and forward it to the first terminal device. Of course, in other alternative embodiments, the second terminal device may also send the relay configuration information or the rejection response message to the first terminal device based on the third indication information and the fourth indication information mentioned above. For example, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, and the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the relay configuration information to the first terminal device. For another example, when the third indication information indicates that the second network device does not support the terminal-to-terminal relay, and / or the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the rejection response message to the first terminal device. For example, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, the third indication information also indicates at least one of the following: the relay service type supported by the second network device, and the terminal type supported by the second network device for the terminal-to-terminal relay. In this case, the second terminal device sends the relay configuration information to the first terminal device when the following conditions are met: the terminal type of the first terminal device is the terminal type supported by the second network device for the terminal-to-terminal relay, the type of relay service that the first terminal device expects to transmit is the relay service type supported by the second network device, and the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal; the second terminal device sends the rejection response message to the first terminal device when at least one of the following conditions is met: the terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, the type of relay service that the first terminal device expects to transmit is different from the relay service type supported by the second network device, and the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal. In some embodiments, the second terminal device is in a radio resource control RRC idle state or an RRC deactivated state, and the second terminal device obtains the fourth indication information from a system message sent by the second network device. In some embodiments, the second terminal device is in an RRC connected state, and the second terminal device obtains the fourth indication information by sending a request message to the second network device. In some embodiments, the second terminal device is in a radio resource control RRC idle state or an RRC deactivated state, and the relay configuration information is carried in a system message sent by a second network device to which the second terminal device belongs; or, the second terminal device is in an RRC connected state, and the relay configuration information is carried in the RRC configuration information sent by the second network device. Exemplarily, the system message may be referred to as a broadcast message or system information (SI). Exemplarily, the system message includes, but is not limited to: a system information block (System Information Block, SIB), a master information block (Master Information Block, MIB), or remaining system information (Remaining System Information, RMSI). It is worth noting that the Radio Resource Control (RRC) state of the second terminal device may include: RRC_INACTIVE state, RRC_IDLE state and RRC_CONNECTED state. RRC_INACTIVE state may also be referred to as RRC inactive state. Among them, for the RRC_CONNECTED state, there is an RRC connection between the second network device and the second terminal device, and there is a UE AS context between the second network device and the second terminal device, that is, the second network device knows that the location of the second terminal device is at a specific cell level, and the mobility of the second terminal device is controlled by the second network device, and unicast data can be transmitted between the second network device and the second terminal device. For the RRC_IDLE state, there is no UE access stratum (Access Stratum, AS) context on the second network device side, and there is no RRC connection. The mobility of the second terminal device is based on cell selection and reselection. The paging of the second terminal device is initiated by the core network (Core Network, CN), and its paging area is configured by CN. For the RRC_INACTIVE state, there is a connection between CN-NR, the UE AS context exists on a certain base station, the mobility of the second terminal device is based on cell selection and reselection, the paging of the second terminal device is triggered by the radio access network (Radio Access Network, RAN), and its paging area is managed by RAN. The second network device knows that the location of the second terminal device is based on the paging area level of RAN. In addition, the second terminal device can switch or convert between various RRC states. For example, a UE in the RRC_CONNECTED state can enter the RRC_IDLE state by releasing the RRC connection; a UE in the RRC_IDLE state can enter the RRC_CONNECTED state by establishing an RRC connection; a UE in the RRC_CONNECTED state can enter the RRC_INACTIVE state by suspending (Release with Suspend) the RRC connection; a UE in the RRC_INACTIVE state can enter the RRC_CONNECTED state by resuming (Resume) the RRC connection, and of course, it can also enter the RRC_IDLE state by releasing the RRC connection. In some embodiments, the first request is carried in at least one of the following messages: PC5RRC message, PC5 sideline message, SL-MAC CE. In some embodiments, the first request includes a reason value indicating the reason for requesting the relay configuration information. Exemplarily, the reason value in the first request may indicate that the first terminal device cannot obtain the relay configuration information from the first network device to which it belongs, or the reason value in the first request may indicate that the first network device does not support terminal-to-terminal relay, or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for the first terminal device; or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for a terminal device whose terminal type is the first terminal device; or the reason value in the first request may indicate that the first network device does not have the ability to configure the relay configuration information for a relay service type whose relay service type is the first terminal device. In some embodiments, the second terminal device includes at least one of the following terminals: a source remote terminal, a target remote terminal, and a relay terminal. In some embodiments, the first terminal device includes at least one of the following terminals: a source remote terminal, a target remote terminal, and a relay terminal. Exemplarily, if the second terminal device is a source remote terminal or a target remote terminal, the first terminal device is a relay terminal. Exemplarily, if the second terminal device is a relay terminal, the first terminal device is a source remote terminal or a target remote terminal. It should be understood that the steps in the configuration information forwarding method 300 may refer to the corresponding steps in the configuration information obtaining method 200, and for the sake of brevity, they will not be repeated here. The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 9 , and the device embodiment of the present application is described in detail below in conjunction with Figures 10 to 13 . FIG. 10 is a schematic block diagram of a first terminal device 400 according to an embodiment of the present application. As shown in FIG. 10 , the first terminal device 400 may include: The receiving unit 410 is configured to receive first indication information sent by a first network device, where the first indication information indicates whether the first network device supports terminal-to-terminal relay; The acquiring unit 420 is configured to acquire relay configuration information used for the terminal-to-terminal relay based on the first indication information. In some embodiments, the first indication information indicates that the first network device supports the terminal-to-terminal relay; The acquisition unit 420 is specifically used for: The relay configuration information is obtained from the first network device. In some embodiments, the first indication information indicates that the first network device does not support the terminal-to-terminal relay; The acquisition unit 420 is specifically used for: The relay configuration information is obtained from a second terminal device that establishes a relay connection with the first terminal device. In some embodiments, when the first indication information indicates that the first network device supports the terminal-to-terminal relay, the first indication information also indicates at least one of the following: the relay service type supported by the first network device, and the terminal type supported by the first network device for the terminal-to-terminal relay. In some embodiments, the terminal type of the first terminal device is a terminal type supported by the first network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is a relay service type supported by the first network device; The acquisition unit 420 is specifically used for: The relay configuration information is obtained from the first network device. In some embodiments, the terminal type of the first terminal device is different from the terminal type supported by the first network device for the terminal-to-terminal relay, and / or the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the first network device; The acquisition unit 420 is specifically used for: The relay configuration information is obtained from a second terminal device that establishes a connection with the first terminal device. In some embodiments, the relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service. In some embodiments, the relay discovery service includes at least one of the following: a layer 2 relay discovery service, a layer 3 relay discovery service. In some embodiments, the terminal types supported by the first network device for the terminal-to-terminal relay include at least one of the following: a remote terminal, a relay terminal. In some embodiments, the remote terminal includes at least one of the following: a source remote terminal, a target remote terminal. In some embodiments, the acquisition unit 420 is specifically used to: Sending a first request to the second terminal device, where the first request is used to request to obtain the relay configuration information; The relay configuration information or a rejection response message sent by the second terminal device is received, where the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device. In some embodiments, the first request is carried in at least one of the following messages: a PC5 radio resource control RRC message, a PC5 sideline message, and a sideline media access control element SL-MAC CE. In some embodiments, the first request includes a reason value indicating the reason for requesting the relay configuration information. In some embodiments, when the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal. In some embodiments, the first terminal device is in a radio resource control RRC idle state or an RRC deactivated state; The acquisition unit 420 is specifically used for: The relay configuration information is obtained from a system message sent by the first network device. In some embodiments, the first terminal device is in a radio resource control RRC connected state; The acquisition unit 420 is specifically used for: The relay configuration information is acquired from the RRC configuration information sent by the first network device. In some embodiments, the first indication information includes a Boolean type parameter. In some embodiments, the receiving unit 410 is further configured to: Second indication information sent by the first network device is received, where the second indication information indicates whether the first network device supports the first terminal device to forward the relay configuration information to the opposite terminal. In some embodiments, the counterpart terminal includes at least one of the following: a relay terminal, a remote terminal. In some embodiments, the second indication information includes a Boolean type parameter. It should be understood that the device embodiment and the method embodiment may correspond to each other, and similar descriptions may refer to the method embodiment. Specifically, the first terminal device 400 shown in FIG. 10 may correspond to the corresponding subject in the method 200 for executing the embodiment of the present application, and the aforementioned and other operations and / or functions of each unit in the first terminal device 400 are respectively for implementing the corresponding processes in each method provided in the embodiment of the present application, and for the sake of brevity, they will not be repeated here. FIG. 11 is a schematic block diagram of a second terminal device 500 according to an embodiment of the present application. As shown in FIG. 11 , the second terminal device 500 may include: A receiving unit 510 is configured to receive a first request sent by a first terminal device, where the first request is used to request to obtain relay configuration information for terminal-to-terminal relay; The sending unit 520 is used to perform a reselection operation of the relay terminal or send the relay configuration information or a rejection response message to the first terminal device, where the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device. In some embodiments, the first terminal device is a relay terminal; or when the first terminal device is not a relay terminal, the second terminal device sends the relay configuration information or the rejection response message to the first terminal device. In some embodiments, before the sending unit 520 sends the relay configuration information or the rejection response message to the first terminal device, the receiving unit 510 is further configured to: receiving third indication information sent by the second network device, where the third indication information indicates whether the second network device supports terminal-to-terminal relay; The sending unit 520 is specifically used for: Based on the third indication information, the relay configuration information or the rejection response message is sent to the first terminal device. In some embodiments, the third indication information indicates that the second network device supports the terminal-to-terminal relay; The sending unit 520 is specifically used for: The relay configuration information is sent to the first terminal device. In some embodiments, the third indication information indicates that the second network device does not support the terminal-to-terminal relay; The sending unit 520 is specifically used for: The rejection response message is sent to the first terminal device. In some embodiments, when the third indication information indicates that the second network device supports the terminal-to-terminal relay, the third indication information also indicates at least one of the following: the relay service type supported by the second network device, and the terminal type supported by the second network device for the terminal-to-terminal relay. In some embodiments, the terminal type of the first terminal device is a terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is a relay service type supported by the second network device; The sending unit 520 is specifically used for: The relay configuration information is sent to the first terminal device. In some embodiments, the terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the second network device; The sending unit 520 is specifically used for: Send the rejection response message to the first terminal device. In some embodiments, the relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service. In some embodiments, the relay discovery service includes at least one of the following: a layer 2 relay discovery service, a layer 3 relay discovery service. In some embodiments, the terminal types supported by the second network device for the terminal-to-terminal relay include at least one of the following: a remote terminal, a relay terminal. In some embodiments, the remote terminal includes at least one of the following: a source remote terminal, a target remote terminal. In some embodiments, before the sending unit 520 sends the relay configuration information or the rejection response message to the first terminal device, the receiving unit 510 is further configured to: Acquire fourth indication information sent by the second network device, where the fourth indication information indicates whether the second network device supports the second terminal device to forward the relay configuration information to the opposite terminal; The sending unit 520 is specifically used for: Based on the fourth indication information, the relay configuration information or the rejection response message is sent to the first terminal device. In some embodiments, when the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the relay configuration information to the first terminal device; when the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the rejection response message to the first terminal device. In some embodiments, the second terminal device is in a radio resource control RRC connected state; The sending unit 520 is specifically used for: The fourth indication information is obtained from a system message sent by the second network device. In some embodiments, the second terminal device is in a radio resource control RRC idle state or an RRC deactivated state; The sending unit 520 is specifically used for: The fourth indication information is obtained by sending a request message to the second network device. In some embodiments, the second terminal device is in a radio resource control RRC idle state or an RRC deactivated state, and the relay configuration information is carried in a system message sent by a second network device to which the second terminal device belongs; or, the second terminal device is in an RRC connected state, and the relay configuration information is carried in the RRC configuration information sent by the second network device. In some embodiments, the first request is carried in at least one of the following messages: a PC5 radio resource control RRC message, a PC5 sideline message, and a sideline media access control element SL-MAC CE. In some embodiments, the first request includes a reason value indicating the reason for requesting the relay configuration information. In some embodiments, when the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal. It should be understood that the device embodiment and the method embodiment may correspond to each other, and similar descriptions may refer to the method embodiment. Specifically, the second terminal device 500 shown in FIG. 11 may correspond to the corresponding subject in the method 300 for executing the embodiment of the present application, and the aforementioned and other operations and / or functions of each unit in the second terminal device 500 are respectively for implementing the corresponding processes in each method provided in the embodiment of the present application, and for the sake of brevity, they will not be repeated here. The communication device of the embodiment of the present application is described above from the perspective of the functional module in conjunction with the accompanying drawings. It should be understood that the functional module can be implemented in hardware form, can be implemented by instructions in software form, and can also be implemented by a combination of hardware and software modules. Specifically, the steps of the method embodiment in the embodiment of the present application can be completed by the hardware integrated logic circuit and / or software form instructions in the processor, and the steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or a combination of hardware and software modules in the decoding processor to perform. Optionally, the software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory, and completes the steps in the method embodiment involved above in conjunction with its hardware. For example, the receiving unit and the sending unit mentioned above may be implemented by a transceiver, and the acquiring unit mentioned above may be implemented by a processor. FIG. 12 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. As shown in FIG. 12 , the communication device 600 may include a processor 610 . The processor 610 may call and run a computer program from the memory to implement the method in the embodiment of the present application. As shown in FIG. 12 , the communication device 600 may further include a memory 620 . The memory 620 may be used to store indication information, and may also be used to store codes, instructions, etc. executed by the processor 610. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application. The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610. As shown in FIG. 12 , the communication device 600 may further include a transceiver 630 . The processor 610 may control the transceiver 630 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices. The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of antennas may be one or more. It should be understood that the various components in the communication device 600 are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus. It should also be understood that the communication device 600 may be the first terminal device of the embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the first terminal device in each method of the embodiment of the present application, that is, the communication device 600 of the embodiment of the present application may correspond to the first terminal device 400 in the embodiment of the present application, and may correspond to the corresponding subject in the method 200 according to the embodiment of the present application, for the sake of brevity, it will not be repeated here. Similarly, the communication device 600 may be the second terminal device of the embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the second terminal device in each method of the embodiment of the present application. That is to say, the communication device 600 of the embodiment of the present application may correspond to the second terminal device 500 in the embodiment of the present application, and may correspond to the corresponding subject in the method 300 according to the embodiment of the present application, for the sake of brevity, it will not be repeated here. In addition, a chip is also provided in an embodiment of the present application. For example, the chip may be an integrated circuit chip with signal processing capabilities, and can implement or execute the methods, steps, and logic diagrams disclosed in the embodiments of the present application. The chip can also be called a system-level chip, a system chip, a chip system, or a system-on-chip chip. Optionally, the chip can be applied to various communication devices, so that the communication device equipped with the chip can execute the methods, steps, and logic diagrams disclosed in the embodiments of the present application. FIG. 13 is a schematic structural diagram of a chip 700 according to an embodiment of the present application. As shown in FIG. 13 , the chip 700 includes a processor 710 . The processor 710 may call and run a computer program from the memory to implement the method in the embodiment of the present application. As shown in FIG. 13 , the chip 700 may further include a memory 720 . The processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application. The memory 720 may be used to store indication information, and may also be used to store codes, instructions, etc. executed by the processor 710. The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710. As shown in FIG. 13 , the chip 700 may further include an input interface 730 . The processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips. As shown in FIG. 13 , the chip 700 may further include an output interface 740 . The processor 710 may control the output interface 740 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips. It should be understood that the chip 700 can be applied to the first terminal device or the second terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the first terminal device or the second terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here. It should also be understood that the various components in the chip 700 are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus. The processors mentioned above may include but are not limited to: General purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete component gate or transistor logic device, discrete hardware components, etc. The processor can be used to implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The steps of the methods disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in a decoding processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the method involved above in combination with its hardware. The memory mentioned above includes but is not limited to: Volatile memory and / or non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory described herein is intended to include these and any other suitable types of memory. A computer-readable storage medium is also provided in an embodiment of the present application for storing a computer program. The computer-readable storage medium stores one or more programs, and the one or more programs include instructions, which, when executed by a portable electronic device including multiple applications, can enable the portable electronic device to perform the method provided in the present application. Optionally, the computer-readable storage medium can be applied to a first terminal device in an embodiment of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the first terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity. Optionally, the computer-readable storage medium can be applied to a second terminal device in an embodiment of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the second terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity. A computer program product is also provided in the embodiment of the present application, including a computer program. Optionally, the computer program product can be applied to the first terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the first terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity. Optionally, the computer program product can be applied to the second terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the second terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity. A computer program is also provided in the embodiment of the present application. When the computer program is executed by a computer, the computer can execute the method provided in the present application. Optionally, the computer program can be applied to the first terminal device in the embodiment of the present application. When the computer program is run on the computer, the computer executes the corresponding process implemented by the first terminal device in each method of the embodiment of the present application. For the sake of brevity, it is not repeated here. Optionally, the computer program can be applied to the second terminal device in the embodiment of the present application. When the computer program is run on the computer, the computer executes the corresponding process implemented by the second terminal device in each method of the embodiment of the present application. For the sake of brevity, it is not repeated here. The present application also provides a communication system, which may include the first terminal device and the second terminal device mentioned above, which will not be described in detail for the sake of brevity. It should be noted that the term "system" in this article may also be referred to as "network management architecture" or "network system". It should also be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms "a", "the", "above", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It can be appreciated by those skilled in the art that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware or in combination with computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiments of the present application. If implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiment of the present application is essentially or part of the prior art that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps in the method provided in the embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk. Those skilled in the art may also realize that, for the convenience and simplicity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the division of units or modules or components in the device embodiment described above is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or modules or components can be combined or integrated into another system, or some units or modules or components can be ignored or not executed. For another example, the unit / module / component described as a separation / display component may or may not be physically separated, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units / modules / components may be selected according to actual needs to achieve the purpose of the embodiment of the present application. Finally, it should be noted that the coupling or direct coupling or communication connection between each other shown or discussed above may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms. The above contents are only specific implementation methods of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the embodiments of the present application, which should be included in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be based on the protection scope of the claims.

Claims

1. A method for obtaining configuration information, characterized in that: The method is applicable to a first terminal device, and the method includes: receiving first indication information sent by a first network device, where the first indication information indicates whether the first network device supports terminal-to-terminal relay; Relay configuration information for the terminal-to-terminal relay is acquired based on the first indication information.

2. The method according to claim 1, characterized in that The first indication information indicates that the first network device supports the terminal-to-terminal relay; The acquiring, based on the first indication information, relay configuration information for the terminal-to-terminal relay includes: The relay configuration information is obtained from the first network device.

3. The method according to claim 1, characterized in that The first indication information indicates that the first network device does not support the terminal-to-terminal relay; The acquiring, based on the first indication information, relay configuration information for the terminal-to-terminal relay includes: The relay configuration information is obtained from a second terminal device that establishes a relay connection with the first terminal device.

4. The method according to claim 1, characterized in that: When the first indication information indicates that the first network device supports the terminal-to-terminal relay, the first indication information also indicates at least one of the following: a relay service type supported by the first network device, and a terminal type supported by the first network device for the terminal-to-terminal relay.

5. The method according to claim 4, characterized in that The terminal type of the first terminal device is a terminal type supported by the first network device for the terminal-to-terminal relay, and the type of the relay service that the first terminal device expects to transmit is a relay service type supported by the first network device; The acquiring, based on the first indication information, relay configuration information for the terminal-to-terminal relay includes: The relay configuration information is obtained from the first network device.

6. The method according to claim 4, characterized in that The terminal type of the first terminal device is different from the terminal type supported by the first network device for the terminal-to-terminal relay, and / or the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the first network device; The acquiring, based on the first indication information, relay configuration information for the terminal-to-terminal relay includes: The relay configuration information is obtained from a second terminal device that establishes a connection with the first terminal device.

7. The method according to any one of claims 4 to 6, characterized in that The relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service.

8. The method according to claim 7, characterized in that The relay discovery service includes at least one of the following: a layer 2 relay discovery service and a layer 3 relay discovery service.

9. The method according to any one of claims 4 to 8, characterized in that The terminal types supported by the first network device for the terminal-to-terminal relay include at least one of the following: a remote terminal and a relay terminal.

10. The method according to claim 9, characterized in that The remote terminal includes at least one of the following: a source remote terminal and a target remote terminal.

11. The method according to claim 3 or 6, characterized in that: The acquiring the relay configuration information from the second terminal device that establishes a relay connection with the first terminal device includes: Sending a first request to the second terminal device, where the first request is used to request to obtain the relay configuration information; The relay configuration information or a rejection response message sent by the second terminal device is received, where the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device.

12. The method according to claim 11, characterized in that The first request is carried in at least one of the following messages: PC5 radio resource control RRC message, PC5 sideline message, sideline media access control element SL-MAC CE.

13. The method according to claim 11 or 12, characterized in that: The first request includes a reason value indicating the reason for requesting the relay configuration information.

14. The method according to any one of claims 11 to 13, characterized in that When the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal.

15. The method according to any one of claims 2 or 5, characterized in that The first terminal device is in a radio resource control RRC idle state or an RRC deactivated state; The acquiring the relay configuration information from the first network device includes: The relay configuration information is obtained from a system message sent by the first network device.

16. The method according to any one of claims 2 or 5, characterized in that The first terminal device is in a radio resource control RRC connected state; The acquiring the relay configuration information from the first network device includes: The relay configuration information is acquired from the RRC configuration information sent by the first network device.

17. The method according to any one of claims 1 to 16, characterized in that The first indication information includes a Boolean type parameter.

18. The method according to any one of claims 1 to 17, characterized in that The method further comprises: Receive second indication information sent by the first network device, where the second indication information indicates whether the first network device supports the first terminal device to forward the relay configuration information to the opposite terminal.

19. The method according to claim 18, characterized in that The opposite terminal includes at least one of the following: a relay terminal and a remote terminal.

20. The method according to claim 18 or 19, characterized in that The second indication information includes a Boolean type parameter.

21. A configuration information forwarding method, characterized in that: The method is applicable to a second terminal device, and the method includes: Receiving a first request sent by a first terminal device, where the first request is used to request to obtain relay configuration information for terminal-to-terminal relay; Execute a reselection operation of the relay terminal or send the relay configuration information or a rejection response message to the first terminal device, wherein the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device.

22. The method according to claim 21, characterized in that When the first terminal device is a relay terminal; or when the first terminal device is not a relay terminal, the second terminal device sends the relay configuration information or the rejection response message to the first terminal device.

23. The method according to claim 21 or 22, characterized in that Before sending the relay configuration information or the rejection response message to the first terminal device, the method further includes: receiving third indication information sent by the second network device, where the third indication information indicates whether the second network device supports terminal-to-terminal relay; The sending of the relay configuration information or the rejection response message to the first terminal device includes: Based on the third indication information, the relay configuration information or the rejection response message is sent to the first terminal device.

24. The method according to claim 23, characterized in that The third indication information indicates that the second network device supports the terminal-to-terminal relay; The sending the relay configuration information or the rejection response message to the first terminal device based on the third indication information includes: Send the relay configuration information to the first terminal device.

25. The method according to claim 23, characterized in that The third indication information indicates that the second network device does not support the terminal-to-terminal relay; The sending the relay configuration information or the rejection response message to the first terminal device based on the third indication information includes: Send the rejection response message to the first terminal device.

26. The method according to claim 23, characterized in that When the third indication information indicates that the second network device supports the terminal-to-terminal relay, the third indication information also indicates at least one of the following: the relay service type supported by the second network device, and the terminal type supported by the second network device for the terminal-to-terminal relay.

27. The method according to claim 26, characterized in that The terminal type of the first terminal device is a terminal type supported by the second network device for the terminal-to-terminal relay, and the type of the relay service that the first terminal device expects to transmit is a relay service type supported by the second network device; The sending the relay configuration information or the rejection response message to the first terminal device based on the third indication information includes: Send the relay configuration information to the first terminal device.

28. The method according to claim 26, characterized in that The terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the second network device; The sending the relay configuration information or the rejection response message to the first terminal device based on the third indication information includes: Send the rejection response message to the first terminal device.

29. The method according to any one of claims 26 to 28, characterized in that The relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service.

30. The method according to claim 29, characterized in that The relay discovery service includes at least one of the following: a layer 2 relay discovery service and a layer 3 relay discovery service.

31. The method according to any one of claims 26 to 30, characterized in that The terminal types supported by the second network device for the terminal-to-terminal relay include at least one of the following: a remote terminal and a relay terminal.

32. The method according to claim 31, characterized in that The remote terminal includes at least one of the following: a source remote terminal and a target remote terminal.

33. The method according to claim 21 or 22, characterized in that Before sending the relay configuration information or the rejection response message to the first terminal device, the method further includes: Acquire fourth indication information sent by the second network device, where the fourth indication information indicates whether the second network device supports the second terminal device to forward the relay configuration information to the opposite terminal; The sending of the relay configuration information or the rejection response message to the first terminal device includes: Based on the fourth indication information, the relay configuration information or the rejection response message is sent to the first terminal device.

34. The method according to claim 33, characterized in that When the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the relay configuration information to the first terminal device; when the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the rejection response message to the first terminal device.

35. The method according to claim 33 or 34, characterized in that The second terminal device is in a radio resource control RRC connected state; The obtaining of the fourth indication information sent by the second network device includes: The fourth indication information is obtained from a system message sent by the second network device.

36. The method according to claim 33 or 34, characterized in that The second terminal device is in a radio resource control RRC idle state or an RRC deactivated state; The obtaining of the fourth indication information sent by the second network device includes: The fourth indication information is obtained by sending a request message to the second network device.

37. The method according to any one of claims 21 to 25, characterized in that The second terminal device is in a radio resource control RRC idle state or an RRC deactivated state, and the relay configuration information is carried in a system message sent by a second network device to which the second terminal device belongs; or, the second terminal device is in an RRC connected state, and the relay configuration information is carried in the RRC configuration information sent by the second network device.

38. The method according to any one of claims 21 to 37, characterized in that The first request is carried in at least one of the following messages: PC5 radio resource control RRC message, PC5 sideline message, sideline media access control element SL-MAC CE.

39. The method according to any one of claims 21 to 38, characterized in that The first request includes a reason value indicating the reason for requesting the relay configuration information.

40. The method according to any one of claims 21 to 39, characterized in that When the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal.

41. A first terminal device, characterized in that: include: A receiving unit, configured to receive first indication information sent by a first network device, where the first indication information indicates whether the first network device supports terminal-to-terminal relay; An acquiring unit is configured to acquire relay configuration information used for the terminal-to-terminal relay based on the first indication information.

42. The first terminal device according to claim 41, characterized in that: The first indication information indicates that the first network device supports the terminal-to-terminal relay; The acquisition unit is specifically used for: The relay configuration information is obtained from the first network device.

43. The first terminal device according to claim 41, characterized in that: The first indication information indicates that the first network device does not support the terminal-to-terminal relay; The acquisition unit is specifically used for: The relay configuration information is obtained from a second terminal device that establishes a relay connection with the first terminal device.

44. The first terminal device according to claim 41, characterized in that: When the first indication information indicates that the first network device supports the terminal-to-terminal relay, the first indication information also indicates at least one of the following: a relay service type supported by the first network device, and a terminal type supported by the first network device for the terminal-to-terminal relay.

45. The first terminal device according to claim 44, characterized in that: The terminal type of the first terminal device is a terminal type supported by the first network device for the terminal-to-terminal relay, and the type of the relay service that the first terminal device expects to transmit is a relay service type supported by the first network device; The acquisition unit is specifically used for: The relay configuration information is obtained from the first network device.

46. ​​The first terminal device according to claim 44, characterized in that: The terminal type of the first terminal device is different from the terminal type supported by the first network device for the terminal-to-terminal relay, and / or the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the first network device; The acquisition unit is specifically used for: The relay configuration information is obtained from a second terminal device that establishes a connection with the first terminal device.

47. The first terminal device according to any one of claims 44 to 46, characterized in that: The relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service.

48. The first terminal device according to claim 47, characterized in that: The relay discovery service includes at least one of the following: a layer 2 relay discovery service and a layer 3 relay discovery service.

49. The first terminal device according to any one of claims 44 to 48, characterized in that: The terminal types supported by the first network device for the terminal-to-terminal relay include at least one of the following: a remote terminal and a relay terminal.

50. The first terminal device according to claim 49, characterized in that: The remote terminal includes at least one of the following: a source remote terminal and a target remote terminal.

51. The first terminal device according to claim 43 or 46, characterized in that: The acquisition unit is specifically used for: Sending a first request to the second terminal device, where the first request is used to request to obtain the relay configuration information; The relay configuration information or a rejection response message sent by the second terminal device is received, where the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device.

52. The first terminal device according to claim 51, characterized in that: The first request is carried in at least one of the following messages: PC5 radio resource control RRC message, PC5 sideline message, sideline media access control element SL-MAC CE.

53. The first terminal device according to claim 51 or 52, characterized in that: The first request includes a reason value indicating the reason for requesting the relay configuration information.

54. The first terminal device according to any one of claims 51 to 53, characterized in that: When the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal.

55. The first terminal device according to any one of claims 42 or 45, characterized in that: The first terminal device is in a radio resource control RRC idle state or an RRC deactivated state; The acquisition unit is specifically used for: The relay configuration information is obtained from a system message sent by the first network device.

56. The first terminal device according to any one of claims 42 or 45, characterized in that: The first terminal device is in a radio resource control RRC connected state; The acquisition unit is specifically used for: The relay configuration information is acquired from the RRC configuration information sent by the first network device.

57. The first terminal device according to any one of claims 41 to 56, characterized in that: The first indication information includes a Boolean type parameter.

58. The first terminal device according to any one of claims 41 to 57, characterized in that: The receiving unit is also used for: Receive second indication information sent by the first network device, where the second indication information indicates whether the first network device supports the first terminal device to forward the relay configuration information to the opposite terminal.

59. The first terminal device according to claim 58, characterized in that: The opposite terminal includes at least one of the following: a relay terminal and a remote terminal.

60. The first terminal device according to claim 58 or 59, characterized in that: The second indication information includes a Boolean type parameter.

61. A second terminal device, characterized in that: include: A receiving unit, configured to receive a first request sent by a first terminal device, wherein the first request is used to request to obtain relay configuration information for terminal-to-terminal relay; A sending unit is used to perform a reselection operation of the relay terminal or send the relay configuration information or a rejection response message to the first terminal device, wherein the rejection response message indicates that the second terminal device refuses to send the relay configuration information to the first terminal device.

62. The second terminal device according to claim 61, characterized in that: When the first terminal device is a relay terminal; or when the first terminal device is not a relay terminal, the second terminal device sends the relay configuration information or the rejection response message to the first terminal device.

63. The second terminal device according to claim 61 or 62, characterized in that: Before the sending unit sends the relay configuration information or the rejection response message to the first terminal device, the receiving unit is further used to: receiving third indication information sent by the second network device, where the third indication information indicates whether the second network device supports terminal-to-terminal relay; Wherein, the sending unit is specifically used for: Based on the third indication information, the relay configuration information or the rejection response message is sent to the first terminal device.

64. The second terminal device according to claim 63, characterized in that: The third indication information indicates that the second network device supports the terminal-to-terminal relay; Wherein, the sending unit is specifically used for: Send the relay configuration information to the first terminal device.

65. The second terminal device according to claim 63, characterized in that: The third indication information indicates that the second network device does not support the terminal-to-terminal relay; Wherein, the sending unit is specifically used for: Send the rejection response message to the first terminal device.

66. The second terminal device according to claim 63, characterized in that: When the third indication information indicates that the second network device supports the terminal-to-terminal relay, the third indication information also indicates at least one of the following: the relay service type supported by the second network device, and the terminal type supported by the second network device for the terminal-to-terminal relay.

67. The second terminal device according to claim 66, characterized in that: The terminal type of the first terminal device is a terminal type supported by the second network device for the terminal-to-terminal relay, and the type of the relay service that the first terminal device expects to transmit is a relay service type supported by the second network device; Wherein, the sending unit is specifically used for: Send the relay configuration information to the first terminal device.

68. The second terminal device according to claim 66, characterized in that: The terminal type of the first terminal device is different from the terminal type supported by the second network device for the terminal-to-terminal relay, and the type of relay service that the first terminal device expects to transmit is different from the type of relay service supported by the second network device; Wherein, the sending unit is specifically used for: Send the rejection response message to the first terminal device.

69. The second terminal device according to any one of claims 66 to 68, characterized in that: The relay service type includes at least one of the following: layer 2 terminal-to-terminal relay service, layer 3 terminal-to-terminal relay service, relay discovery service, and non-relay discovery service.

70. The second terminal device according to claim 69, characterized in that: The relay discovery service includes at least one of the following: a layer 2 relay discovery service and a layer 3 relay discovery service.

71. The second terminal device according to any one of claims 66 to 70, characterized in that: The terminal types supported by the second network device for the terminal-to-terminal relay include at least one of the following: a remote terminal and a relay terminal.

72. The second terminal device according to claim 71, characterized in that: The remote terminal includes at least one of the following: a source remote terminal and a target remote terminal.

73. The second terminal device according to claim 61 or 62, characterized in that: Before the sending unit sends the relay configuration information or the rejection response message to the first terminal device, the receiving unit is further used to: Acquire fourth indication information sent by the second network device, where the fourth indication information indicates whether the second network device supports the second terminal device to forward the relay configuration information to the opposite terminal; Wherein, the sending unit is specifically used for: Based on the fourth indication information, the relay configuration information or the rejection response message is sent to the first terminal device.

74. The second terminal device according to claim 73, characterized in that: When the fourth indication information indicates that the second network device supports the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the relay configuration information to the first terminal device; when the fourth indication information indicates that the second network device does not support the second terminal device forwarding the relay configuration information to the opposite terminal, the second terminal device sends the rejection response message to the first terminal device.

75. The second terminal device according to claim 73 or 74, characterized in that: The second terminal device is in a radio resource control RRC connected state; Wherein, the sending unit is specifically used for: The fourth indication information is obtained from a system message sent by the second network device.

76. The second terminal device according to claim 73 or 74, characterized in that: The second terminal device is in a radio resource control RRC idle state or an RRC deactivated state; Wherein, the sending unit is specifically used for: The fourth indication information is obtained by sending a request message to the second network device.

77. The second terminal device according to any one of claims 61 to 75, characterized in that: The second terminal device is in a radio resource control RRC idle state or an RRC deactivated state, and the relay configuration information is carried in a system message sent by a second network device to which the second terminal device belongs; or, the second terminal device is in an RRC connected state, and the relay configuration information is carried in the RRC configuration information sent by the second network device.

78. The second terminal device according to any one of claims 61 to 77, characterized in that: The first request is carried in at least one of the following messages: PC5 radio resource control RRC message, PC5 sideline message, sideline media access control element SL-MAC CE.

79. The second terminal device according to any one of claims 61 to 78, characterized in that: The first request includes a reason value indicating the reason for requesting the relay configuration information.

80. The second terminal device according to any one of claims 61 to 79, characterized in that: When the first terminal device is a source remote terminal or a target remote terminal, the second terminal device is a relay terminal; when the first terminal device is a relay terminal, the second terminal device is a source remote terminal or a target remote terminal.

81. A first terminal device, characterized in that: include: A transceiver, a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the transceiver and / or the processor executes the method according to any one of claims 1 to 20.

82. A second terminal device, characterized in that: include: A transceiver, a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the transceiver and / or the processor executes the method according to any one of claims 21 to 40.

83. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method according to any one of claims 1 to 20 or a method according to any one of claims 21 to 40.

84. A computer-readable storage medium, characterized in that Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 20 or the method according to any one of claims 21 to 40.

85. A computer program product, characterized in that Comprising computer program instructions which cause a computer to perform the method according to any one of claims 1 to 20 or the method according to any one of claims 21 to 40.

86. A computer program, characterized in that The computer program causes a computer to perform the method according to any one of claims 1 to 20 or the method according to any one of claims 21 to 40.

Images