Communication method, network device, terminal, communication system, and storage medium

Abstract

Embodiments of the present disclosure provide a communication method, a first core network device, a second core network device, a terminal, a communication system, and a storage medium. The method is executed by a first core network device, and the method comprises: sending first information to a second core network device, wherein the first information comprises a proximity service (ProSe) strategy, and the ProSe strategy indicates at least one of the following: whether the discovery communication between terminals supports communication for executing multi-hop relay; and a maximum hop count of the multi-hop relay. In this way, a method for configuring a ProSe strategy in UE-to-UE discovery communication is clarified.

Description

Communication method, network device, terminal, communication system and storage medium Technical Field The present disclosure relates to the field of communication technology, and in particular to a communication method, a first core network device, a second core network device, a terminal, a communication system and a storage medium. Background Art In the field of communication technology, terminal-to-terminal (UE-to-UE) discovery communication has been introduced. In UE-to-UE discovery communication, it is necessary to configure the Proximity Services (ProSe) policy. After the introduction of UE-to-UE discovery communication in relay communication, how to configure the ProSe policy is an issue that needs to be considered. Summary of the invention In UE-to-UE discovery communication, it is not clear how to configure the ProSe policy. The embodiments of the present disclosure provide a communication method, a first core network device, a second core network device, a terminal, a communication system and a storage medium. According to a first aspect of an embodiment of the present disclosure, a communication method is provided, the method being performed by a first core network device, the method comprising: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a second aspect of an embodiment of the present disclosure, a communication method is provided, the method being performed by a second core network device, the method comprising: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a third aspect of an embodiment of the present disclosure, a communication method is provided, the method being executed by a terminal, the method comprising: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a fourth aspect of an embodiment of the present disclosure, a communication method is provided, the method comprising: The first core network device sends first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a fifth aspect of an embodiment of the present disclosure, a first core network device is provided, wherein the first core network device includes: The transceiver module is configured as follows: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a sixth aspect of an embodiment of the present disclosure, a second core network device is provided, wherein the second core network device includes: The transceiver module is configured as follows: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to a seventh aspect of an embodiment of the present disclosure, a terminal is provided, the terminal including: The transceiver module is configured as follows: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. According to the eighth aspect of an embodiment of the present disclosure, a communication system is provided, wherein the communication system includes a first core network device, a second core network device and a terminal; the first core network device is configured to implement the method described in the first aspect, the second core network device is configured to implement the method described in the second aspect, and the terminal is configured to implement the method described in the third aspect. According to a ninth aspect of an embodiment of the present disclosure, a first core network device is provided, wherein the first core network device includes: one or more processors; The first core network device is used to execute the method described in the first aspect. According to a tenth aspect of an embodiment of the present disclosure, a second core network device is provided, wherein the second core network device includes: one or more processors; The second core network device is used to execute the method described in the second aspect. According to an eleventh aspect of an embodiment of the present disclosure, a terminal is provided, the terminal including: one or more processors; The terminal is used to execute the method described in the third aspect. According to the twelfth aspect of an embodiment of the present disclosure, a storage medium is provided, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method provided by the first aspect, the second aspect or the third aspect. The technical solution provided by the embodiments of the present disclosure clarifies the method for configuring ProSe policy in UE-to-UE discovery communication. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention. FIG. 1a is a schematic diagram showing an architecture of a communication system according to an exemplary embodiment; FIG2a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 3a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 3b is a schematic flow chart of a communication method according to an exemplary embodiment; FIG4a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 4b is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 5a is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 5b is a schematic flow chart of a communication method according to an exemplary embodiment; Fig. 6a is a schematic flow chart showing a communication method according to an exemplary embodiment; FIG7a is a schematic flow chart of a communication method according to an exemplary embodiment; FIG8a is a schematic structural diagram of a first core network device according to an exemplary embodiment; FIG8b is a schematic structural diagram of a second core network device according to an exemplary embodiment; Fig. 8c is a schematic diagram showing the structure of a terminal according to an exemplary embodiment; FIG9a is a schematic diagram showing the structure of a UE according to an exemplary embodiment; Fig. 9b is a schematic structural diagram of a communication device according to an exemplary embodiment. DETAILED DESCRIPTION The embodiments of the present disclosure provide a communication method, a first core network device, a second core network device, a terminal, a communication system and a storage medium. In a first aspect, an embodiment of the present disclosure provides a communication method, the method being performed by a first core network device, the method comprising: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In the above embodiment, since the first information sent to the second core network device includes the ProSe policy indicating support for discovery or communication between terminals through multi-hop relays and the maximum number of hops of the multi-hop relays, a ProSe policy involving multi-hop relays between terminals is provided, and discovery communication in a scenario involving multi-hop relays between terminals can be reliably performed based on the ProSe policy. In combination with some embodiments of the first aspect, in some embodiments, sending the first information to the second core network device includes: Determine to update the ProSe policy, and send the first information to the second core network device. In the above embodiment, when the ProSe policy needs to be updated, the first core network device is sent in a timely manner. information. In combination with some embodiments of the first aspect, in some embodiments, the method further includes one of the following: Determine that a first request sent by a terminal is received, and determine to update the ProSe policy; wherein the first request is used to request to update the ProSe policy; Determine that the network triggers a ProSe policy update of the terminal, and determine to update the ProSe policy. In the above embodiment, when the first request is received or the network triggers the terminal to update the ProSe policy, it is determined to update the ProSe policy. In combination with some embodiments of the first aspect, in some embodiments, the method further includes: Receiving second information sent by the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy. In the above embodiment, after sending the first information, second information sent by the first core network device indicating whether the terminal has successfully or failed to update the ProSe policy stored in the terminal based on the ProSe policy can be received, so that it can be clearly determined whether the update of the ProSe policy stored in the terminal based on the ProSe policy has succeeded or failed. In a second aspect, an embodiment of the present disclosure provides a communication method, the method being performed by a second core network device, the method comprising: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: The first information is sent to the terminal. In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: receiving second information sent by the terminal; wherein the second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy; Send the second information to the first core network device. In a third aspect, an embodiment of the present disclosure provides a communication method, which is executed by a terminal, and includes: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In conjunction with some embodiments of the second aspect, the method further includes: The ProSe policy stored in the terminal is updated based on the ProSe policy. In conjunction with some embodiments of the second aspect, the method further includes: Sending second information to the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy. In a fourth aspect, an embodiment of the present disclosure provides a communication method, the method comprising: The first core network device sends first information to the second core network device; The second core network device sends the first information to the terminal; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In a fifth aspect, an embodiment of the present disclosure provides a first core network device, wherein the first core network device includes: The transceiver module is configured as follows: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In a sixth aspect, an embodiment of the present disclosure provides a second core network device, where the second core network device includes: The transceiver module is configured as follows: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In a seventh aspect, an embodiment of the present disclosure provides a first core network device, wherein the first core network device includes: The transceiver module is configured as follows: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In the eighth aspect, the embodiment of the present disclosure provides that the communication system includes a first core network device, a second core network device and a terminal; the first core network device is configured to implement the method described in the first aspect, the second core network device is configured to implement the method described in the second aspect, and the terminal is configured to implement the method described in the third aspect. In a ninth aspect, an embodiment of the present disclosure provides a first core network device, the first core network device including: one or more processors; Among them, the first core network device is used to execute the method provided by the first aspect. In a tenth aspect, an embodiment of the present disclosure provides a second core network device, the second core network device including: one or more processors; Among them, the second core network device is used to execute the method provided by the second aspect. In an eleventh aspect, an embodiment of the present disclosure provides a terminal, the terminal including: one or more processors; Among them, the terminal is used to execute the method provided by the third aspect. In the twelfth aspect, an embodiment of the present disclosure provides a storage medium, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first aspect, the second aspect and the third aspect. In a thirteenth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation manner of the first aspect, the second aspect and the third aspect. In a fourteenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first aspect, the second aspect, and the third aspect. In a fifteenth aspect, an embodiment of the present disclosure provides a chip or a chip system. The chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first aspect, the second aspect, and the third aspect. It can be understood that the first core network device, the second core network device, the terminal, the communication system, the storage medium, the program product, the computer program, the chip or the chip system are all used to execute the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method, and will not be repeated here. The embodiments of the present disclosure provide a communication method, a first core network device, a second core network device, a terminal, a communication system, and a storage medium. In some embodiments, the communication method and the information indication method, the information processing method, the information transmission method and other terms can be replaced with each other, and the communication system, the information processing system and other terms can be replaced with each other. The embodiments of the present disclosure are not exhaustive, but are only illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined, for example, some or all of the steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments. In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships. The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun after the article may be understood as a singular expression or a plural expression. In the embodiments of the present disclosure, “plurality” refers to two or more. In some embodiments, "at least one", "one or more", The terms "a plurality of", "multiple" and the like are interchangeable. In some embodiments, "at least one of A and B", "A and / or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc., may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). When there are more branches such as A, B, C, etc., the above is also similar. In some embodiments, the recording method of "A or B" may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). When there are more branches such as A, B, C, etc., the above is also similar. The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute unnecessary restrictions due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields", and the "first" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number, and can be one or more. Taking the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different. In some embodiments, “including A”, “comprising A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A. In some embodiments, terms such as "in response to ...", "in response to determining ...", "in the case of ...", "at the time of ...", "when ...", "if ...", "if ...", etc. can be used interchangeably. In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "no more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other. In some embodiments, devices and equipment may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc. In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc. In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station (radio base station)", "fixed station (fixed station)", and in some embodiments may also be understood as "node (node)", "access point (access point)", "transmission point (TP)", "reception point (reception point, RP)", "transmission and / or reception point (transmission / reception point, TRP)" "panel (panel)", "antenna panel (antenna panel)", "antenna array (antenna array)" "cell (cell)", "macro cell (macro cell)", "small cell (small cell)", "femto cell (femto cell)", "pico cell (pico cell)", "sector (sector)", "cell group (cell group)", "serving cell (serving cell)", "carrier (carrier)", "component carrier (component carrier)", "bandwidth part (bandwidth part, BWP)" and the like. In some embodiments, "terminal" or "terminal device" can be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. In some embodiments, acquisition of data, information, etc. may comply with the laws and regulations of the country where the data is obtained. In some embodiments, data, information, etc. may be obtained with the user's consent. In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment. Any combination of elements, rows, or columns may also be implemented as independent embodiments. FIG. 1 a is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG. 1 a , a communication system 100 includes a terminal 101 and a network device 102 . In some embodiments, the network device 102 may include at least one of an access network device and a core network device. The core network device may include a first core network device 1021 and a second core network device 1022 . In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer (Pad), 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 surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited to these. In some embodiments, the access network device may be, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto. In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure may become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs. In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be referred to as a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this. In some embodiments, the core network device may be a device including one or more network elements, or may be a plurality of devices or a group of devices, each including all or part of the one or more network elements. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC). It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. A person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems. The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG. 1a, or part of the subject, but are not limited thereto. The subjects shown in FIG. 1a are examples, and the communication system may include all or part of the subjects in FIG. 1a, or may include other subjects other than FIG. 1a, and the number and form of the subjects are arbitrary, and the connection relationship between the subjects is an example, and the subjects may be connected or disconnected, and the connection may be in any manner, which may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection. The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine-to-Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), systems using other communication methods, and next-generation systems based on them. In addition, multiple systems can also be combined (for example, LTE Or a combination of LTE-A and 5G, etc.) applications. In some embodiments, authorization and configuration of 5G ProSe UE-to-UE relay are provided. For policy / parameter configuration of 5G ProSe UE-to-UE relay, the following information is provided in the UE to support the UE to assume the role of 5G ProSe UE-to-UE relay: In some embodiments, when the UE is "served by NG-RAN", the authorization policy as a 5G ProSe Layer 3 and / or Layer 2 UE-to-UE relay: In land mobile network communications (PLMNs, Public Land Mobile Networks), the UE is authorized to relay the traffic of the 5G ProSe Layer 3 and / or Layer 2 end UE accessing the 5G ProSe UE-to-UE relay through the PC5 reference point. The authorization of the UE to act as a 5G ProSe UE-to-UE relay also authorizes 5G ProSe UE-to-UE relay discovery using Model A and Model B. NOTE 1 It is up to the UE and application implementation to choose the discovery model, or whether to perform both models simultaneously. In some embodiments, the ProSe relay discovery strategy or parameters of the 5G ProSe UE-to-UE relay: Includes parameters that enable the UE to perform 5GproSe UE-to-UE relay discovery when provided by the Policy Control Function (PCF) or provided in the mobile equipment (ME) or configured in the Universal Integrated Circuit Card (UICC): 5G ProSe UE-to-UE relay discovery parameters (user information ID, relay service code, UE-to-UE relay layer indicator). The UE-to-UE relay layer indicator indicates whether the associated relay service code (RSC, RelayService Code) provides 5G ProSe layer 2 or layer 3 UE-to-UE relay service. The default destination layer 2 ID for sending relay discovery announcement messages and receiving relay discovery request messages; Default destination Layer 2 ID for sending or receiving direct communication request messages for ProSe UE-to-UE relay communication with integrated discovery; For 5G ProSe Layer 3 UE-to-UE relays, the traffic type (IP, Ethernet, unstructured) used by each relay service code relay traffic; Includes security related content for relay discovery for each relay service code. NOTE 2: SA WG3 will determine the security related aspects of UE-to-UE relay for 5G proximity services. In some embodiments, the validity time represents the expiration time of the policy / parameters for 5G proximity service UE-to-UE relay discovery and communication. In some embodiments, the following information is provided in the UE to support the UE to assume the role of a 5G ProSe end UE, so that 5G ProSe UE-to-UE relay can be used: In some embodiments, authorization policy for using 5G ProSe Layer 3 and / or Layer 2 UE-to-UE relay: Whether the UE is authorized to use 5G ProSe Layer 3 and / or Layer 2 UE-to-UE relay. Authorization of the UE to act as a 5G ProSe Terminal UE also authorizes the use of 5G ProSe UE-to-UE relay discovery with Model A and Model B. NOTE 3: It is up to the UE and application implementation to choose the discovery model, or whether to perform both models simultaneously. In some embodiments, policies / parameters for 5G proximity service UE-to-UE relay discovery: Includes parameters for discovery of a 5G ProSe UE-to-UE relay as a 5G ProSe end UE, and parameters for enabling a UE to connect to a 5G ProSe UE-to-UE relay after discovery when provided by the PCF or provided in the ME or configured in the UICC: 5G ProSe UE-to-UE relay discovery parameters (user information ID, relay service code, UE-to-UE relay layer indicator). The UE-to-UE relay layer indicator indicates whether the associated RSC provides 5G ProSe Layer 2 or Layer 3 UE-to-UE relay service. The default destination layer 2 ID for sending relay discovery request messages and receiving relay discovery announcement messages; Default destination Layer 2 ID for sending / receiving direct communication request messages for ProSe UE-to-UE relay communication with integrated discovery; For 5G ProSe Layer 3 UE-to-UE relays, the traffic type (IP, Ethernet, unstructured) used by each relay service code relay traffic; Includes security related content for relay discovery for each relay service code. NOTE 4: SA WG3 will determine the security related aspects of 5G ProSe UE-to-UE relay. In some embodiments, the validity time represents the expiration time of the policy / parameters of 5G ProSe UE-to-UE relay discovery and communication. The following information is provided in the UE to support the UE to assume the role of 5G ProSe UE-to-UE relay and the following information is provided in the UE to support the UE to assume the role of 5G ProSe end UE to enable the use of 5G ProSe UE-to-UE relay: In some embodiments, when the UE is not "served by NG-RAN", the radio parameters for 5G ProSe UE-to-UE relay discovery: Includes radio parameters NR PC5 with geographical areas and an indication of whether they are "operator managed" or "non-operator managed". The UE uses the radio parameters to perform 5G ProSe direct discovery over the PC5 reference point when "NG-RAN not serving" only if the UE can reliably locate itself in the corresponding geographical area. Otherwise, the UE is not authorized to send. -Default PC5DRX configuration (see TS 38.331

[0016] ). Note 5: RAN WG2 will determine the default PC5 discontinuous reception (DRX) configuration for 5G ProSe UE-to-UE relay scenarios. NOTE 6: The radio parameters used for 5G ProSe UE-to-UE relay discovery when the UE is not “served by NG-RAN” and the radio parameters used for 5G ProSe direct discovery in clause 5.1.2.1 when the UE is “not served by NG-RAN” are expected to be adjusted for direct and relay discovery for UE-to-UE communication. In some embodiments, when the UE is not "served by NG-RAN", the radio parameters for 5G ProSe UE-to-UE relay communications: Includes radio parameters NR PC5 with geographical areas and an indication of whether they are "operator managed" or "non-operator managed". The UE uses the radio parameters to perform 5G ProSe direct communication over the PC5 reference point when "not served by NG-RAN" only if the UE can reliably locate itself in the corresponding geographical area. Otherwise, the UE is not authorized to send. NOTE 7: For 5G ProSe direct communication in clause 5.1.3.1, the radio parameters for 5G ProSe UE-UE relay communication when the UE is not “served by NG-RAN” and the radio parameters when the UE is “not served by NG-RAN” are expected to be aligned for direct and relayed UE-to-UE communication. In some embodiments, in the UE-triggered ProSe policy provision procedure, when the UE determines that the 5G ProSe policy or parameters are invalid, the UE initiates the UE-triggered policy provision procedure to request the PCF for the ProSe policy or parameters: If the validity timer indicated in the 5G ProSe policy or parameters expires; If there are no valid parameters, for example, for the 5G ProSe identifier that the UE wants to use, for the current area, or due to an abnormal situation. In some embodiments, a policy configuration process is provided, including: Step S11, the UE sends an uplink (UL) non-access stratum (NAS) transmission message carrying a UE policy container (UE policy provision request requesting 5G ProSe policy) to the access and mobility management function (AMF). Step S12: AMF sends a NAMF_COMMICTION_N1MessageNotify request to PCF, where the request includes the UE policy container received from the UE. Step S13: The PCF receives a UE policy container indicating a UE policy provisioning request to request a 5G ProSe policy. If the 5G ProSe policy is authorized based on the AMF input, the PCF performs the UE policy delivery procedure defined in clause 4.2.4.3 of TS 23.502 [5]. However, the current procedure does not include new parameters to support multi-hop U2U relay services. FIG2a is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2a, the present disclosure embodiment relates to a communication method, which is used in a communication system 100, and the method includes: Step S2101: The first core network device determines a ProSe policy; In some embodiments, the first core network device may be a PCF. In some embodiments, the ProSe policy indicates support for discovery or communication between terminals via multi-hop relays. It should be noted that discovery may be a process in which a terminal determines a communication counterpart before communication. In some embodiments, the ProSe policy indicates: supporting discovery or communication between terminals via a multi-hop relay; and a maximum number of hops of the multi-hop relay. In some embodiments, the ProSe policy indicates whether discovery communication between terminals supports communication performing multi-hop relay. Exemplarily, the ProSe policy indicates that the discovery communication between the terminals supports the communication with multi-hop relay; or, the ProSe policy indicates that the discovery communication between the terminals does not support the communication with multi-hop relay. In some embodiments, the ProSe policy indicates a maximum number of hops for the multi-hop relay. In some embodiments, the ProSe policy indicates: whether discovery communication between terminals supports communication with multi-hop relay; and the maximum number of hops of the multi-hop relay. In some embodiments, discovery communication may be: in communication between terminals (e.g., between a discovery terminal and a discovered terminal), a communication mechanism in which user terminals discover other user terminals or communicate with the other user terminals directly or indirectly through relays without the intervention of a wireless base station. In some embodiments, the multi-hop may include at least two relays between the terminals for discovery communication. In some embodiments, the number of relay hops between the terminals that are found to be communicating may be less than the maximum number of hops. is 5, and the number of relay hops between the terminals in communication can be 3. In some embodiments, the multi-hop relay may be at least two relays included between the terminals. Exemplarily, the multi-hop relay may be at least two relays included between the discoverer terminal and the discovered terminal. In some embodiments, the communication of the multi-hop relay in the present disclosure may be the communication between the discoverer terminal and the discoverer terminal performed by the discoverer terminal through the at least two relays. In some embodiments, the ProSe strategy may further include at least one of the following: ProSe policies or parameters discovered directly by ProSe; ProSe policies or parameters for ProSe direct communication; ProSe policies or parameters for ProSe Layer 2 and / or Layer 3 terminals to network relays; ProSe Layer 2 and / or Layer 3 remote UE ProSe policy or parameters; ProSe policies or parameters for ProSe Layer 2 and / or Layer 3 UE-to-UE relay; ProSe policies or parameters of ProSe layer 2 and / or layer 3 terminals. In some embodiments, the first core network device determines to update the ProSe policy after receiving a first request sent by the terminal. In some embodiments, the terminal sends a first request to the first core network device through the access network device. In some embodiments, the first core network device determines that a first request sent by the terminal through the access network device is received, and determines to update the ProSe policy. In some embodiments, the first request is used to request the ProSe policy. In some embodiments, the first request is used to request to update the ProSe policy. In some embodiments, the first request is a terminal policy provisioning request. In some embodiments, the first core network device may receive the first request at an initial registration request device. In some embodiments, the first core network device may receive the first request through a terminal policy container. In some embodiments, the first core network device determines that the network triggers a ProSe policy update of the terminal, and determines to update the ProSe policy. In some embodiments, it is determined that the location of the terminal has changed, it is determined that the network triggers a ProSe policy update of the terminal, and it is determined to update the ProSe policy. In some embodiments, it is determined that the ProSe subscription data has changed, it is determined that the network triggers a ProSe policy update of the terminal, and it is determined to update the ProSe policy. Step S2102: The first core network device sends first information to the second core network device. In some embodiments, the second core network device may be an AMF. In some embodiments, the second core network device receives the first information sent by the first core network device. In some embodiments, the first information includes a ProSe policy. In some embodiments, the first information includes an updated ProSe policy. In some embodiments, the first core network device sends a Namf_Communication_N1MessageTransfer to the second core network device using a terminal policy container. In some embodiments, the terminal policy container includes the first information. In some embodiments, the first core network device determines to update the ProSe policy, and the first core network device sends the first information to the second core network device. In some embodiments, the first core network device determines that it has received a first request sent by the terminal, the first core network device determines to update the ProSe policy, and the first core network device sends first information to the second core network device; wherein, the first request is used to request the ProSe policy or the first request is used to request to update the ProSe policy. In some embodiments, the first core network determines that the network triggers a ProSe policy update for the terminal, the first core network device determines to update the ProSe policy, and the first core network device sends first information to the second core network device. In some embodiments, the first core network device determines that the location of the terminal has changed, the first core network device determines that the network triggers a ProSe policy update for the terminal, the first core network device determines to update the ProSe policy, and the first core network device sends first information to the second core network device. In some embodiments, the first core network device determines that the ProSe subscription data changes, the first core network device determines that the network triggers a ProSe policy update for the terminal, the first core network device determines to update the ProSe policy, and the first core network device sends first information to the second core network device. Step S2103: The second core network device sends the first information to the terminal. In some embodiments, the terminal receives first information sent by the second core network device. In some embodiments, the terminal completes registration and the second core network device is able to access the terminal, and the second core network device sends a First information. It should be noted that if the terminal has not completed registration or the first core network device cannot access the terminal, the second core network device cannot send the first information to the terminal. The second core network device can report to the first core network device that the first information cannot be transmitted. In some embodiments, the second core network device sends the first information to the terminal via transparent transmission. In some embodiments, when the terminal is in a connection management idle state (CM-IDLE), the second core network device triggers a network triggered service request process to establish a connection between the terminal and the network. In some embodiments, the second core network device sends the first information to the terminal via a wireless access network device (eg, a base station) in a transparent transmission manner. Step S2104: The terminal updates the ProSe policy. In some embodiments, after receiving the first information sent by the second core network device, the terminal updates the ProSe policy. In some embodiments, the terminal updates the ProSe policy stored in the terminal based on the ProSe policy. Step S2105: The terminal sends second information to the second core network device. In some embodiments, the second core network device receives the second information sent by the terminal. In some embodiments, the second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy. In some embodiments, the terminal determines that updating of the ProSe policy is successful, and the second information indicates that the terminal successfully updates the ProSe policy stored in the terminal based on the ProSe policy. In some embodiments, the terminal determines that updating of the ProSe policy fails, and the second information indicates that the terminal fails to update the ProSe policy stored in the terminal based on the ProSe policy. Step S2106: The second core network device sends second information to the first core network device. In some embodiments, the first core network device receives second information sent by the second core network device. In some embodiments, the second core network device sends the first information to the first core network device using Namf_Conmmunication_N1MessageNotify. In some embodiments, the term "information" can be interchangeably with terms such as "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "field", and "data". In some embodiments, the term "send" can be interchangeable with terms such as "transmit", "report", and "transmit". The information indication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2106. For example, step S2101 can be implemented as an independent embodiment, step S2102 can be implemented as an independent embodiment, step S2103 can be implemented as an independent embodiment, step S2104 can be implemented as an independent embodiment, step S2105 can be implemented as an independent embodiment, and step S2106 can be implemented as an independent embodiment. For example, step S2101 can be implemented as an independent embodiment in combination with step S2102 and step S2103, step S2101 can be implemented as an independent embodiment in combination with step S2102, step S2103 and step S2104 as an independent embodiment, and step S2101 can be implemented as an independent embodiment in combination with step S2102, step S2103, step S2104, step S2105 and step S2106, but is not limited thereto. FIG3a is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3a, the present disclosure embodiment relates to a communication method, which is executed by a first core network device, and the method includes: Step S3101: Determine the ProSe strategy. In some embodiments, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S3102: Send the first information. In some embodiments, the optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S3103: Receive the second information. In some embodiments, the optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. The information indication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3103. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, and step S3103 may be implemented as an independent embodiment. For example, step S3101 combined with step S3102 may be implemented as an independent embodiment, and step S3101 combined with step S3102 and step S3103 may be implemented as independent embodiments, but is not limited thereto. FIG3b is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3b, the present disclosure embodiment relates to a communication method, which is executed by a first core network device, and the method includes: Step S3201: Send first information to the second core network device. In some embodiments, the first information includes a ProSe policy for a proximity service; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In some embodiments, the optional implementation of step S3201 can refer to the optional implementation of step S2102 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. In some embodiments, sending the first information to the second core network device includes: Determine to update the ProSe policy, and send the first information to the second core network device. In some embodiments, the method further comprises one of the following: Determine that a first request sent by a terminal is received, and determine to update the ProSe policy; wherein the first request is used to request to update the ProSe policy; Determine that the network triggers a ProSe policy update of the terminal, and determine to update the ProSe policy. In some embodiments, the method further comprises: Receiving second information sent by the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy. FIG4a is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4a, the present disclosure embodiment relates to a communication method, which is executed by a second core network device, and the method includes: Step S4101: Obtain first information. In some embodiments, first information sent by a first core network device is received. In some embodiments, the second core network device receives the first information sent by the first core network device, but is not limited to this, and can also receive the first information sent by other entities. In some embodiments, the second core network device obtains first information specified by the protocol. In some embodiments, the second core network device obtains the first information from an upper layer(s). In some embodiments, the second core network device performs processing to obtain the first information. In some embodiments, the optional implementation of step S4101 can refer to the optional implementation of step S2102 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S4102: Send first information to the terminal. In some embodiments, the optional implementation of step S4102 can refer to the optional implementation of step S2103 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S4103: receiving the second information sent by the terminal. In some embodiments, the optional implementation of step S4103 can refer to the optional implementation of step S2105 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S4104: Send second information to the first core network device. In some embodiments, the optional implementation of step S4104 can refer to the optional implementation of step S2106 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. The information indication method involved in the embodiments of the present disclosure may include at least one of steps S4101 to S4104. For example, step S4101 may be implemented as an independent embodiment, step S4102 may be implemented as an independent embodiment, step S4103 may be implemented as an independent embodiment, and step S4104 may be implemented as an independent embodiment. For example, step S4101 combined with step S4102 may be implemented as an independent embodiment, and step S4101 combined with step S4102, step S4103, and step S4104 may be implemented as an independent embodiment, but is not limited thereto. FIG4b is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4b, the present disclosure embodiment relates to a communication method, which is executed by a second core network device, and the method includes: Step S4201: Receive first information sent by a first core network device. In some embodiments, the first information includes a ProSe policy for a proximity service; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In some embodiments, the optional implementation of step S4201 can refer to the optional implementation of step S2102 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. In some embodiments, the method further comprises: The first information is sent to the terminal. In some embodiments, the method further comprises: receiving second information sent by the terminal; wherein the second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy; Send the second information to the first core network device. FIG5a is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG5a, the present disclosure embodiment relates to a communication method, which is executed by a terminal, and the method includes: Step S5101: Obtain first information; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay. In some embodiments, first information sent by a second core network device is received. In some embodiments, first information sent by the second core network device is received, but not limited to this, and first information sent by other entities may also be received. In some embodiments, first information specified by a protocol is obtained. In some embodiments, the first information is obtained from an upper layer(s). In some embodiments, processing is performed to obtain the first information. In some embodiments, the optional implementation of step S5101 can refer to the optional implementation of step S2103 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S5102: Update the ProSe policy. In some embodiments, the optional implementation of step S5102 can refer to the optional implementation of step S2104 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. Step S5103: Send second information to the second core network device. In some embodiments, the optional implementation of step S5103 can refer to the optional implementation of step S2105 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. The information indication method involved in the embodiments of the present disclosure may include at least one of steps S5101 to S5103. For example, step S5101 may be implemented as an independent embodiment, step S5102 may be implemented as an independent embodiment, and step S5103 may be implemented as an independent embodiment. For example, step S5101 combined with step S5102 may be implemented as an independent embodiment, and step S5101 combined with step S5102 and step S5103 may be implemented as independent embodiments, but the present invention is not limited thereto. FIG5b is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG5b, the present disclosure embodiment relates to a communication method, which is executed by a terminal, and the method includes: Step S5201: Receive the first information sent by the second core network device. In some embodiments, the first information includes a ProSe policy for a proximity service; the ProSe policy indicates at least one of the following: Whether discovery communication between terminals supports multi-hop relay communication; The maximum number of hops of the multi-hop relay. In some embodiments, the optional implementation of step S5201 can refer to the optional implementation of step S2103 in Figure 2a and other related parts of the embodiment involved in Figure 2a, which will not be repeated here. In some embodiments, the method further comprises: The ProSe policy stored in the terminal is updated based on the ProSe policy. In some embodiments, the method further comprises: Sending second information to the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy. FIG6a is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG6a, the present disclosure embodiment relates to a communication method, which is used in a communication system 100, and the method includes one of the following steps: Step S6101: The first core network device sends first information to the second core network device. The optional implementation of step S6101 can refer to the optional implementation of steps S2101 to S2106 in FIG2a and other related parts in the embodiment involved in FIG2a, which will not be described in detail here. Step S6102: The first core network device sends first information to the second core network device. The optional implementation of step S6002 can refer to the optional implementation of steps S2101 to S2106 in FIG. 2a and other related parts in the embodiment involved in FIG. 2a, which will not be described in detail here. In some embodiments, the above method may include the methods of the above-mentioned communication system side, first core network device side, second core network device side, terminal, etc., which will not be repeated here. In order to better understand the embodiments of the present disclosure, some exemplary embodiments are further described below: Example 1: Referring to FIG. 7a , the communication method provided includes: Step S7101: PCF determines to update the ProSe policy. In some embodiments, the PCF determines to update the ProSe policy of UE1 based on at least one of the following triggers: The PCF receives a UE policy provisioning request in a UE policy container, e.g., requesting 5G ProSe policy during an initial registration request; UE policy updates triggered by the network, such as changes in UE location or changes in ProSe subscription data; In some embodiments, the UE policy container includes at least one of the following: Indication of whether multi-hop is supported; Maximum allowed number of hops; And, the following other parameters: ProSe policies or parameters discovered directly by ProSe; ProSe policies or parameters for ProSe direct communication; ProSe policies or parameters for ProSe Layer 2 and / or Layer 3 terminals to network relays; ProSe Layer 2 and / or Layer 3 remote UE ProSe policy or parameters; ProSe policies or parameters for ProSe Layer 2 and / or Layer 3 UE-to-UE relay; ProSe policies or parameters of ProSe Layer 2 and / or Layer 3 terminals. Step S7102: PCF sends Namf_Communication_N1MessageTransfer to AMF using the UE policy container, where the UE policy container includes a new parameter [support of multi-hop indication, or / and the maximum allowed number of hops MaxAllowedHops] (corresponding to the first information in this disclosure). Step S7103: Network-triggered service request. If UE1 is registered with AMF and AMF is reachable, AMF will transparently transmit the UE policy container to UE via the registered and reachable access. Otherwise, AMF reports to PCF that the UE policy container cannot be delivered to UE. In some embodiments, when UE1 is in CM-IDLE state, AMF triggers the "Network Triggered Service Request Procedure" to establish a connection between UE1 and the network. Step S7104: Terminal policy distribution: The AMF transparently transmits (corresponding to the transparent transmission mode) the UE policy container (including new parameters, corresponding to the first information in the present disclosure) to the UE via the radio access network (R)AN. Step S7105: Send policy distribution result. The UE updates the UE policy provided by the PCF based on the ProSe policy, and sends the update result to the AMF through a response message (corresponding to the second information in this disclosure). Step S7106: AMF uses Namf_Conmmunication_N1MessageNotify to forward the UE's response information to PCF. In the embodiments of the present disclosure, part or all of the steps and their optional implementations may be arbitrarily combined with part or all of the steps in other embodiments, or may be arbitrarily combined with optional implementations of other embodiments. The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step performed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step performed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods. It should be understood that the division of the units or modules in the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the units or modules in the device can be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the units or modules of the above device. The processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory in the device or a memory outside the device. Alternatively, the unit or module in the device can be implemented in the form of a hardware circuit, and the functions of some or all of the units or modules can be realized by designing the hardware circuit. The above hardware circuit can be understood as one or more processors; for example, in one implementation, the above hardware circuit is an application-specific integrated circuit (ASIC), and the functions of some or all of the above units or modules are realized by designing the logical relationship of the components in the circuit; for example, in another implementation, the above hardware circuit can be realized by a programmable logic device (PLD), taking a field programmable gate array (FPGA) as an example, which can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to realize the functions of some or all of the above units or modules. All units or modules of the above device can be realized in the form of a processor calling software, or in the form of a hardware circuit, or in part by a processor calling software, and the remaining part is realized in the form of a hardware circuit. In the disclosed embodiment, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may realize certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the processor loads a configuration document to implement the process of hardware circuit configuration, which may be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it may also be a hardware circuit designed for artificial intelligence, which may be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc. Figure 8a is a schematic diagram of the structure of the first core network device proposed in the embodiment of the present disclosure. As shown in Figure 8a, the first core network device 7100 may include: at least one of a transceiver module 7101, a processing module 7102, etc. In some embodiments, the above-mentioned transceiver module is used to send and receive information. Optionally, the above-mentioned transceiver module is used to execute at least one of the communication steps such as sending and / or receiving performed by the first core network device in any of the above methods, which will not be repeated here. Optionally, the above-mentioned processing module is used to execute at least one of the other steps performed by the first core network device in any of the above methods, which will not be repeated here. Figure 8b is a schematic diagram of the structure of the second core network device proposed in the embodiment of the present disclosure. As shown in Figure 8b, the second core network device 7200 may include: at least one of a transceiver module 7201, a processing module 7202, etc. In some embodiments, the above-mentioned transceiver module is used to send and receive information. Optionally, the above-mentioned transceiver module is used to execute at least one of the communication steps such as sending and / or receiving performed by the second core network device in any of the above methods, which will not be repeated here. Optionally, the above-mentioned processing module is used to execute at least one of the other steps performed by the second core network device in any of the above methods, which will not be repeated here. FIG8c is a schematic diagram of the structure of the terminal proposed in the embodiment of the present disclosure. As shown in FIG8c, the terminal 7300 may include: at least one of a transceiver module 7301, a processing module 7302, etc. In some embodiments, the transceiver module is used to send and receive information. Optionally, the transceiver module is used to perform at least one of the communication steps such as sending and / or receiving performed by the terminal in any of the above methods, which will not be repeated here. Optionally, the processing module is used to perform at least one of the other steps performed by the terminal in any of the above methods, which will not be repeated here. In some embodiments, the processing module can be a module or include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be replaced with the processor. FIG9a is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. The communication device 8100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. The communication device 8100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment. As shown in FIG9a, the communication device 8100 includes one or more processors 8101. The processor 8101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to The central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a program, and process the data of the program. The communication device 8100 is used to execute any of the above methods. In some embodiments, the communication device 8100 further includes one or more memories 8102 for storing instructions. Optionally, all or part of the memory 8102 may also be outside the communication device 8100. In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the transceiver 8103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S3101, but not limited thereto), and the processor 8101 performs at least one of the other steps (for example, step S2102, step S3102, but not limited thereto). In some embodiments, the transceiver may include a receiver and / or a transmitter, and the receiver and the transmitter may be separate or integrated. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, etc. may be replaced with each other, the terms such as transmitter, transmission unit, transmitter, transmission circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other. In some embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8102, and the interface circuit 8104 may be used to receive signals from the memory 8102 or other devices, and may be used to send signals to the memory 8102 or other devices. For example, the interface circuit 8104 may read instructions stored in the memory 8102 and send the instructions to the processor 8101. The communication device 8100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 9a. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc. Fig. 9b is a schematic diagram of the structure of the chip 8200 proposed in the embodiment of the present disclosure. In the case where the communication device 8100 may be a chip or a chip system, reference may be made to the schematic diagram of the structure of the chip 8200 shown in Fig. 9b, but the present invention is not limited thereto. The chip 8200 includes one or more processors 8201, and the chip 8200 is used to execute any of the above methods. In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the interface circuit 8202 is connected to the memory 8203. The interface circuit 8202 can be used to receive signals from the memory 8203 or other devices, and the interface circuit 8202 can be used to send signals to the memory 8203 or other devices. For example, the interface circuit 8202 can read instructions stored in the memory 8203 and send the instructions to the processor 8201. In some embodiments, the interface circuit 8202 executes at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S3101, but not limited to this), and the processor 8201 executes at least one of the other steps (for example, step S2102, step S3102, but not limited to this). In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably. In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Optionally, all or part of the memory 8203 may be outside the chip 8200. The present disclosure also proposes a storage medium, on which instructions are stored, and when the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium. The present disclosure also proposes a program product, and when the program product is executed by the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the program product is a computer program product. The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to execute any one of the above methods.

Claims

1. A communication method, characterized in that: The method is performed by a first core network device, and the method includes: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

2. The method according to claim 1, characterized in that The sending the first information to the second core network device includes: Determine to update the ProSe policy, and send the first information to the second core network device.

3. The method according to claim 2, characterized in that The method further comprises one of the following: Determine that a first request sent by a terminal is received, and determine to update the ProSe policy; wherein the first request is used to request to update the ProSe policy; Determine that the network triggers a ProSe policy update of the terminal, and determine to update the ProSe policy.

4. The method according to claim 1, characterized in that: The method further comprises: Receiving second information sent by the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy.

5. A communication method, characterized in that: The method is performed by a second core network device, and the method includes: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

6. The method according to claim 5, characterized in that The method further comprises: The first information is sent to the terminal.

7. The method according to claim 6, characterized in that The method further comprises: receiving second information sent by the terminal; wherein the second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy; Send the second information to the first core network device.

8. A communication method, characterized in that: The method is executed by a terminal, and includes: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

9. The method according to claim 8, characterized in that The method further comprises: The ProSe policy stored in the terminal is updated based on the ProSe policy.

10. The method according to claim 9, characterized in that The method further comprises: Sending second information to the second core network device; The second information indicates whether the terminal succeeds or fails in updating the ProSe policy stored in the terminal based on the ProSe policy.

11. A communication method, characterized in that: The method comprises: The first core network device sends first information to the second core network device; The second core network device sends the first information to the terminal; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

12. A first core network device, characterized in that: The first core network device includes: The transceiver module is configured as follows: Sending first information to the second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

13. A second core network device, characterized in that: The second core network device includes: The transceiver module is configured as follows: Receiving first information sent by a first core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

14. A terminal, characterized in that: The terminal comprises: The transceiver module is configured as follows: Receiving first information sent by a second core network device; The first information includes a proximity service ProSe policy; the ProSe policy indicates at least one of the following: Support discovery or communication between terminals through multi-hop relays; The maximum number of hops of the multi-hop relay.

15. A communication system, characterized in that: The communication system includes a first core network device, a second core network device and a terminal; the first core network device is configured to implement the method described in any one of claims 1 to 4, and the second core network device is configured to implement the method described in any one of claims 5 to 7; the terminal is configured to implement the method described in any one of claims 8 to 10.

16. A first core network device, characterized in that: The first core network device includes: one or more processors; The first core network device is used to execute the method according to any one of claims 1 to 4.

17. A second core network device, characterized in that: The second core network device includes: one or more processors; The second core network device is used to execute the method described in any one of claims 5 to 7.

18. A terminal, characterized in that: The terminal comprises: one or more processors; The terminal is used to execute the method according to any one of claims 8 to 10.

19. A storage medium, characterized in that: The storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the method according to any one of claims 1 to 4, claims 5 to 7, or claims 8 to 10.

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