EAS DISCOVERY METHOD, APPARATUS AND NETWORK DEVICE

Abstract

The present disclosure provides an EAS discovery method, apparatus, and network device, the method including a step of the first network function sending a first message to a second network function, or the method including a step of sending reselection network indication information to a terminal based on first information during EAS search or EAS relocation.

Description

Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. 202210326264.0, filed in China on March 29, 2022, the entire contents of which are incorporated herein by reference. [Technical field]

[0002] The present disclosure relates to the field of wireless technology, and in particular to EAS discovery methods, apparatus and network devices. [Background technology]

[0003] In current wireless communication technology, a third-party application platform (Operator Platform, OP) for unified operator control is proposed, and a simple search process for users to directly interact with the OP is proposed, and after the OP is introduced, an Edge Application Server (EAS) is required to solve the problems that occur between operators. Currently, when a user's location is in the network of Operator 1, but there is no OP of Home Operator 1, and there is only a 5G Core Network 2 (5GC2) and OP coverage of Home Operator 2, when User Equipment (UE) needs to access an access edge application, how to realize EAS discovery between operators (networks) and how to relocate the EAS when the user moves, no relevant solutions have been presented at present. Summary of the Invention

[0004] The objective of the present disclosure is to provide an EAS discovery method, apparatus and network device to realize EAS inter-network discovery and access.

[0005] An embodiment of the present disclosure provides a method for implementing an edge application server (EAS), the method being performed by a first network function, the method comprising: The first network function sends a first message to a second network function.

[0006] Optionally, in the method, the step of the first network function sending the first message to the second network function comprises: During EAS search or EAS relocation, the first network function sends a first message to a second network function based on the first information.

[0007] Optionally, in the method, after the first network function has sent the first message to a second network function, the method further comprises: receiving a second message sent from the second network function; The second message includes EAS information.

[0008] Optionally, the method further comprises: The method further includes receiving, during the EAS search, a third message sent from a third network function.

[0009] Optionally, the method further comprises: The method further includes a step of the third network function receiving a fourth message, the fourth message matching a first rule, and sending the third message to the first network function.

[0010] Optionally, in the method, the first rule is a DNS message processing rule.

[0011] Optionally, in the method, the step of the first network function sending a first message to a second network function comprises: The first network function sends the first message to the second network function based on the third message.

[0012] Optionally, in the method, the first rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and The application of the fourth message request is a cooperative application; and the second network providing edge application services.

[0013] Optionally, in the method, during EAS relocation, the step of the first network function sending a first message to a second network function comprises: During EAS relocation, if a second rule is satisfied, the first network function sends a first message to a second network function.

[0014] Optionally, in the method, the second rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and the second network providing edge application services.

[0015] Optionally, the method further comprises: The method further includes filtering networks during an EAS search based on the first information to select an EAS that can provide service to the terminal.

[0016] Optionally, in the method, the first message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0017] Optionally, in the method, the first information is: Federal information and A Federal Capability Identifier for the terminal; and A service network; and a latency list of the operator.

[0018] Optionally, the method further comprises: The method further includes acquiring the service network and / or the federal capability identifier during establishment of a PDU session of the terminal.

[0019] Optionally, the method further comprises: The method further includes the step of the first network function receiving the federal information sent by a second network function via a fifth message.

[0020] Optionally, in the method, the federal information comprises: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information "latency" and a supported access method.

[0021] Optionally, in said method, said federal information is provided to said second network function NEF by an AF.

[0022] Optionally, in the method, after receiving a second message sent from the second network function during EAS search or relocation, the method further comprises: The method further includes inserting a local PDU session anchor L-PSA as necessary during a PDU session change.

[0023] Optionally, in the method, after receiving a second message sent from the second network function during EAS search or relocation, the method further comprises: The method includes carrying EAS information in a PDU session modification command.

[0024] Optionally, in the method, the second message comprises: EAS IP address, EAS Fully Qualified Domain Name (FQDN) and at least one of the following:

[0025] An embodiment of the present disclosure further provides a method of an edge application server (EAS), performed by a second network function NEF1, the method comprising: receiving a first message sent from a first network function; and / or obtaining address information of a fourth network function; and / or sending a sixth message to the fourth network function, the sixth message being used to request obtaining EAS information.

[0026] Optionally, the method further comprises: The method further includes receiving a seventh message sent from the fourth network function, the seventh message including EAS information.

[0027] Optionally, the method further comprises: The method further includes sending a second message to the first network function, the second message including EAS information.

[0028] Optionally, in the method, the step of obtaining address information of the fourth network function comprises: The method includes obtaining address information of a fourth network function based on the second information.

[0029] Optionally, in the method, the second information is network pre-configured information and is used to retrieve address information of an inter-network NEF.

[0030] Optionally, the method further comprises: sending an eighth message to a fifth network function; And / or further comprising the step of receiving a ninth message sent from the fifth network function.

[0031] Optionally, in the method, the ninth message includes address information of the fourth network function.

[0032] Optionally, in the method, the first message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0033] Optionally, in the method, the seventh message comprises: EAS IP address, and at least one of the EAS FQDN.

[0034] Optionally, in the method, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0035] An embodiment of the present disclosure further provides an edge application server (EAS) method, performed by a fourth network function, the method comprising: receiving a sixth message sent from a second network function, the sixth message being used to request obtaining EAS information; and / or sending a tenth message to a sixth network function, the tenth message being used to request obtaining EAS information.

[0036] Optionally, the method further comprises: The method further includes receiving an eleventh message sent from the sixth network function, the eleventh message including EAS information.

[0037] Optionally, the method further comprises: The method further includes a step of transmitting the seventh message to the second network function NEF1, the seventh message including EAS information.

[0038] Optionally, in the method, the sixth message and the tenth message each include: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0039] Optionally, in the method, the eleventh message comprises: EAS IP address, and at least one of the following:

[0040] An embodiment of the present disclosure further provides an implementation method for an edge application server (EAS), the implementation method being performed by a sixth network function, the method comprising: receiving a tenth message sent from a fourth network function, the tenth message being used to request obtaining EAS information; And / or the step of obtaining EAS information based on the tenth message.

[0041] Optionally, the method further comprises: The method further includes the step of sending an eleventh message to the fourth network function, the eleventh message including EAS information.

[0042] Optionally, in the method, the step of obtaining EAS information based on the tenth message further comprises: The method includes a step of obtaining the EAS information after making a DNS query to a DNS server by a seventh network function based on the tenth message.

[0043] Optionally, the method further comprises: The sixth network function further includes determining the DNS server based on third information.

[0044] Optionally, in the method, the third information is The terminal location, Application representation and An external group identifier; and edge application server deployment information (EAS deployment information, EDI) information.

[0045] Optionally, in the method, the tenth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0046] An embodiment of the present disclosure further provides an implementation method of an edge application server (EAS), which is performed by a fifth network function, the method comprising: receiving an eighth message sent from the second network function; and / or sending a ninth message to the second network function.

[0047] Optionally, in the method, the ninth message includes address information of a fourth network function.

[0048] Optionally, in the method, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0049] Optionally, the method is performed by a first network function, the method comprising: During the EAS search or EAS relocation, sending reselection network indication information to the terminal based on the first information.

[0050] Optionally, in the method, during the EAS search, the method further comprises: The method further includes receiving the first message sent from the second network function.

[0051] Optionally, in the method, during the EAS search, the method further comprises: The method further includes the step of the second network function receiving a second message, matching the second message to a first rule, and sending the first message to the first network function.

[0052] Optionally, in the method, during the EAS search, the step of the first network function sending reselection network indication information to the terminal based on the first information includes: The method includes a step of sending reselection network indication information to the terminal based on the first information after the first network function receives the first message.

[0053] Optionally, in the method, the first rule is: The first network does not provide an edge application service based on the location of the terminal; and The requesting application of the second message is a federated application, and the second network provides an edge application service.

[0054] Optionally, the method further comprises sending reselection network indication information to the terminal based on the first information during EAS relocation.

[0055] During EAS relocation, send reselection network indication information to the terminal based on the first information under a condition that the second rule is satisfied.

[0056] Optionally, in the method, the second rule is: AF triggers EAS redirection, The terminal moves.

[0057] Optionally, the method further comprises: The method further includes filtering the network list to select the EAS based on the first information.

[0058] Optionally, in the method, the first information is: Federal information and A Federal Capability Identifier for the terminal; and A service network; and a latency list of the operator.

[0059] Optionally, the method further comprises: The method further includes acquiring the service network and / or the federal capability identifier during establishment of a PDU session of the terminal.

[0060] Optionally, the method further comprises: The method further includes the step of the first network function receiving the federal information transmitted by a third network function via a third message.

[0061] Optionally, in the method, the federal information comprises: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information latency, and a supported access method.

[0062] Optionally, in the method, the federation information is provided to the second network function by an AF.

[0063] An embodiment of the present disclosure further provides a method for implementing an edge application server (EAS), the method being executed by a terminal, the method comprising: The method includes receiving reselection network indication information sent from the first network function during the EAS search or EAS relocation.

[0064] Optionally, the method further comprises: The method further includes establishing a PDU session in a network indicated by the reselection network indication information and performing EAS access.

[0065] An embodiment of the present disclosure further provides a network device, the network device being a first network function, the network device including a transceiver; The transceiver is A first message is sent to a second network function.

[0066] An embodiment of the present disclosure further provides a network device, the network device being a second network function, the network device including a transceiver; The transceiver is receiving a first message sent from a first network function; and / or acquiring address information of a fourth network function; and / or sending a sixth message to the fourth network function, the sixth message being used to request obtaining EAS information.

[0067] An embodiment of the present disclosure further provides a network device, the network device being a fourth network function, the network device including a transceiver; The transceiver is receiving a sixth message sent from the second network function, the sixth message being used to request retrieval of the EAS information; and / or sending a tenth message to the sixth network function, the tenth message being used to request obtaining the EAS information.

[0068] An embodiment of the present disclosure further provides a network device, the network device being a sixth network function, the network device including a transceiver; The transceiver is receiving a tenth message sent from the fourth network function, the tenth message being used to request retrieval of the EAS information; And / or obtain EAS information based on the tenth message.

[0069] An embodiment of the present disclosure further provides a network device, the network device being a fifth network function, the network device including a transceiver; The transceiver is receiving an eighth message sent from the second network function; and / or transmitting a ninth message to the second network function.

[0070] An embodiment of the present disclosure further provides a network device, the network device being a first network function, the network device including a transceiver; The transceiver is During the EAS search or EAS relocation, based on the first information, send reselection network indication information to the terminal.

[0071] An embodiment of the present disclosure further provides a terminal, the terminal including a transceiver; The transceiver is Receive reselection network indication information sent from the first network function during EAS search or EAS relocation.

[0072] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a first network function, the device comprising: A first transceiver unit for transmitting a first message to a second network function.

[0073] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a second network function, comprising: receiving a first message sent from a first network function; and / or acquiring address information of a fourth network function; and / or sending a sixth message to the fourth network function, the sixth message including a second transceiver unit used to request obtaining EAS information.

[0074] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a fourth network function, and the device includes: receiving a sixth message sent from the second network function, the sixth message being used to request retrieval of the EAS information; and / or sending a tenth message to the sixth network function, the tenth message including the third transceiver unit used to request obtaining the EAS information.

[0075] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a sixth network function, and the device includes: receiving a tenth message sent from the fourth network function, the tenth message being used to request retrieval of the EAS information; and / or a fourth transceiver unit for obtaining EAS information based on the tenth message.

[0076] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a fifth network function, and the device includes: receiving an eighth message sent from the second network function; and / or a fifth transceiver unit for transmitting a ninth message to the second network function.

[0077] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a first network function, the device comprising: and a first transceiver unit for sending reselection network indication information to the terminal based on the first information during EAS search or EAS relocation.

[0078] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a terminal, and includes: and a second transceiver unit for receiving reselection network indication information sent from the first network function during EAS search or EAS relocation.

[0079] An embodiment of the present disclosure further provides a network device including a transceiver, a processor, a memory, and a program or instructions stored in the memory and executable by the processor, which implements any of the discovery methods described above when the processor executes the program or instructions.

[0080] An embodiment of the present disclosure further provides a readable storage medium having stored thereon a program or instruction, which, when executed by a processor, implements the steps in any of the discovery methods described above.

[0081] The above technical proposal of the present disclosure has the following beneficial effects. In the manifestation method described in the embodiments of the present disclosure, during EAS search or EAS relocation, a first network function can use first information to send a first message to a second network function to request an EAS between networks, and realize the manifestation and access of the EAS between networks. [Brief description of the drawings]

[0082] [Figure 1] FIG. 2 is a schematic diagram of a system architecture using the method of the embodiment of the present disclosure. [Diagram 2] 1 is a schematic flowchart of embodiment 1 described in Example 1 of the present disclosure. [Diagram 3] FIG. 1 is a schematic diagram of embodiment 1 of using the method according to the embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of embodiment 2 of the method of the present disclosure. [Diagram 5] 1 is a schematic flow chart transmitted by Federal Information. [Figure 6] 1 is a schematic flowchart of embodiment 2 of the method according to example 1 of the present disclosure. [Figure 7] 1 is a schematic flowchart of embodiment 3 of the method according to example 1 of the present disclosure. [Figure 8] 1 is a schematic flowchart of embodiment 4 of the method according to example 1 of the present disclosure. [Figure 9] 1 is a schematic flowchart of embodiment 5 of the method according to example 1 of the present disclosure. [Figure 10] 1 is a schematic flowchart of embodiment 1 of the method according to example 2 of the present disclosure. [Figure 11] 1 is a schematic flowchart of embodiment 2 of the method according to example 2 of the present disclosure. [Figure 12] FIG. 1 is a schematic diagram of embodiment 3 of the method according to the examples of the present disclosure. [Figure 13] FIG. 1 is a schematic diagram of embodiment 4 of the method according to the examples of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0083] In order to make the technical problems, technical solutions and advantages solved by the present disclosure clearer, the present disclosure will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0084] It should be understood that the references "in one embodiment" or "one example" throughout the specification mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of "in one embodiment" or "in one example" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0085] In various embodiments of the present disclosure, it should be understood that the magnitude of the numbers of each process below does not imply the order of execution, and the order of execution of each process should not constitute any limitation on the implementation process of the embodiments of the present disclosure, but should be determined by its function and inherent logic.

[0086] In order to realize inter-network emergence and access of EAS, an embodiment of the present disclosure provides an EAS emergence method, in which during EAS search or EAS relocation, a first network device can send a first message to a second network function to request inter-network EAS, and realize inter-network emergence and access of EAS.

[0087] Figure 1 shows an application system using the EAS discovery method according to the embodiment of the present disclosure. The application system includes at least two networks, and can be referred to as including at least two operator networks. The core network of each operator network includes a number of network functions, such as an Application Function (AF), an Access and Mobility Management Function (AMF), a Session Management Function (SMF), a Network Exposure Function (NEF), a User plane Function (UPF), an Edge Application Server Discovery Function (EASDF), a Data network (DN) and an EAS, and the terminal UE is connected to the network function of the core network by a Radio Access Network (RAN).

[0088] Using the expression method described in the embodiments of the present disclosure, in one embodiment, a UE in a first network can search for or express an EAS in a second network through a network function of the first network, or relocate an EAS in the second network through a network function of the first network, thereby realizing inter-network expression and access of an EAS.

[0089] Example 1 In the method for developing an edge application server (EAS) described in Example 1 of the present disclosure, one embodiment is performed by a first network function, and as shown in FIG. 2, the method includes the following step S210.

[0090] At S210, the first network function SMF1 sends a first message to a second network function NEF1.

[0091] In one embodiment, optionally, the step of the first network function SMF1 sending the first message to the second network function NEF1 comprises: The method includes a step of the first network function SMF1 sending a first message to a second network function NEF1 based on first information during EAS search or EAS relocation.

[0092] Using the manifestation method described in this Example 1, a first network function can use the first information to send a first message to a second network function to request inter-network EAS, and realize inter-network manifestation and access of EAS.

[0093] In the first embodiment of the present disclosure, the first network function and the second network function are respectively network functions of a first network. Optionally, the first network function is an SMF and the second network function is an NEF. In order to easily distinguish from the network function of the second network, the first network function can be represented as an SMF1 and the second network function can be represented as an NEF1.

[0094] In an embodiment of the present disclosure, optionally, the first information is: Federal Information A terminal Federation Capability Identifier; and a serving network, which may be a serving Public Land Mobile Network (PLMN) or a serving network; and a latency list of the operator.

[0095] Alternatively, the operator latency list may be provided by an application, whose end-to-end latency from the server to the terminal in each network is used by the SMF to make the selection and decision.

[0096] In one embodiment thereof, optionally, during the EAS search, the first network function SMF1 filters the network based on the first information and selects an EAS capable of providing services to the terminal, and optionally selects an optimal EAS capable of providing services to the terminal.

[0097] In the first embodiment of the present disclosure, optionally, the first message includes: The terminal location, An application identifier; a public land mobile network (PLMN) identifier; and an External Group Identifier.

[0098] In one embodiment thereof, optionally, the PLMN identifier in the first message is a network identifier of the requested second network, such that the first message can be sent by the first network function SMF1 to the second network function NEF1, and the second network function NEF1 can send a request message to a network function of the second network (e.g. a NEF of the second network) to search for or reveal an EAS of the second network or to relocate an EAS in the second network.

[0099] In the expression method described in Example 1 of the present disclosure, after step S210, the method further comprises: The method further includes a step of receiving a second message sent from the second network function NEF1, the second message including EAS information.

[0100] Optionally, this second message is a reply message to the first message.

[0101] In an embodiment of the present disclosure, optionally, the first message is a Federation event exposure request message (Nnef_FederationEventExposure request) and the second message is a Federation event exposure response message (Nnef_FederationEventExposure response).

[0102] In an embodiment of the present disclosure, optionally, during an EAS search, the method further comprises: receiving a third message sent from a third network function; said third network function receiving a fourth message, matching the fourth message with a first rule, and sending said third message to said first network function SMF1; The method further includes a step of transmitting the first message to the second network function NEF1 based on the first information after the first network function SMF1 receives the third message.

[0103] Optionally, the first rule is a DNS message processing rule.

[0104] Optionally, the first rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and The application of the fourth message request is a cooperative application; and the second network providing edge application services.

[0105] In Example 1 of the present disclosure, optionally, the third network function may be an EASDF, and in order to easily distinguish it from the network function of the second network, this third network function may be represented as EASDF1.

[0106] Optionally, the fourth message is a domain name system DNS query request message and the third message is a DNS message.

[0107] In the manifestation method described in the embodiments of the present disclosure, in one embodiment thereof, during an EAS search, the terminal sends a fourth message (DNS query request) to the third network function EASDF1, which performs rule matching and sends a third message (DNS request) to the first network function SMF1, whereby the first network function SMF1 sends a first message to the second network function NEF1 based on this third message (DNS request) and the first information, i.e., sends a federation event exposure request Nnef_FederationEventExposure request.

[0108] In another embodiment, optionally, during EAS relocation, the step of sending a first message to the second network function NEF1 comprises: During EAS relocation, if a second rule is satisfied, the first network function SMF1 sends a first message to a second network function NEF1.

[0109] The second rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and the second network providing edge application services.

[0110] Optionally, the method includes a step of triggering L-PSA insertion and EAS redirection when the first network function SMF1 determines UE mobility, and / or a step of triggering EAS redirection by the AF, for example when the AF detects that the service state of the terminal UE does not meet the requirements.

[0111] Using this embodiment, after initiating EAS redirection based on the above conditions, the first network function SMF1 determines based on the location of the terminal that there is no EAS in the first network that can provide edge application services, and / or determines based on pre-acquired information that there is an EAS in the second network that can provide edge application services to the terminal, and sends a first message to the second network function NEF1 based on the first information, i.e., sends a federation event exposure request Nnef_FederationEventExposure request, to request inter-network EAS, and realizes inter-network exposure and access of EAS.

[0112] 3 and 4 together below illustrate specific embodiments of using the expression methods described in the Examples of this disclosure during EAS search and EAS rearrangement.

[0113] Referring to FIG. 3, during EAS search, a process of realizing inter-network expression and access of EAS using the expression method described in the embodiments of the present disclosure includes the following steps S301 to S309.

[0114] In S301, the terminal UE completes the establishment of a PDU session in a first network, and optionally, during the PDU session establishment, a serving network and / or a federal capability identifier of the terminal is carried in the SM context information of the PDU session establishment process. Optionally, the serving network may include, but is not limited to include, only a PLMN ID. A PDU, i.e., a Protocol Data Unit, is a protocol data unit.

[0115] Alternatively, the EASDF selection is performed after the PDU session is established.

[0116] At S302, the terminal UE sends a fourth message (DNS query request) to the third network function EASDF1.

[0117] In S303, the third network function EASDF1 matches the fourth message to the first rule based on the fourth message and sends a third message to the first network function SMF1, the third message being a DNS message; Optionally, the first rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and The application of the fourth message request is a cooperative application; and the second network providing edge application services.

[0118] In S304, the first network function SMF1 sends a first message, ie, a federation event exposure request Nnef_FederationEventExposure request, to the second network function NEF1 based on the first information. Specifically, the first network function SMF1 filters a network list of other operators that can provide a service to the terminal based on at least one of the federation information in the first information, the terminal's federation capability identifier, and the service network, and selects an operator network (second network) with the shortest latency from the network list of other operators to provide a service to the terminal based on the latency list of each operator fed back from the AF. If it finds that the optimal EAS2 of the second network is accessible by the first network, it invokes a federation event exposure request Nnef_FederationEventExposure request and sends the federation event exposure request Nnef_FederationEventExposure request to the second network function NEF1.

[0119] In an embodiment of the present disclosure, optionally, the Federal Event Exposure Request (first message) includes: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0120] Using the expression method described in the embodiments of the present disclosure, the second network function NEF1 obtains the address information of the fourth network function based on this first message.

[0121] In an embodiment of the present disclosure, the fourth network function is a network function of a second network, and optionally, this fourth network function is a NEF, and to facilitate distinction from the network function of the first network, this fourth network function may be represented as NEF2.

[0122] In one of the embodiments, optionally, the second network function NEF1 can obtain address information of the fourth network function NEF2 in the following steps S305 and S306.

[0123] In S305, the second network function NEF1 sends an eighth message to the fifth network function, which is used to request a query for address information of the fourth network function NEF2.

[0124] Alternatively, as shown in FIG. 1, the fifth network function may be a Federation NRF connected between NEF1 of the first network and NEF2 of the second network, and used for querying address information between NEFs of multiple networks.

[0125] In one embodiment of the present disclosure, optionally, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0126] In S306, the second network function NEF1 receives a ninth message transmitted from the fifth network function, the ninth message being a response message to the eighth message; This ninth message includes the address information of the fourth network function NEF2.

[0127] In this step, the fifth network function Federation NRF retrieves the address information of the NEF of the corresponding network based on the PLMN identifier requested in the eighth message, i.e. determines the address information of the fourth network function NEF2, and sends a third response message to the second network function NEF1, which is used to carry the address information of the fourth network function NEF2.

[0128] In the embodiment of the present disclosure, in another embodiment, optionally, the second network function NEF1 does not need to obtain the address information of the fourth network function NEF2 through the fifth network function Federation NRF, and obtains the address information of the fourth network function NEF2 based on the second information; The second information is network pre-configured information, which is used to search for the address information of an inter-network NEF.

[0129] Specifically, address information of an NEF in a network other than the first network can be preset in an NEF in the first network, i.e., preset in the second network function NEF1, and in such an execution situation, based on the preset information, the second network function NEF1 can directly obtain address information of the fourth network function NEF2.

[0130] In S307, the second network function NEF1 sends a sixth message to the fourth network function NEF2, where the sixth message is used to request obtaining accessible EAS information.

[0131] Optionally, the second network function NEF1 sends a sixth message by calling an event exposure request Nnef_EventExposure request, and optionally the sixth message includes: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0132] In S308, the fourth network function NEF2 receives the sixth message, and determines based on the external group identifier in the sixth message that the sixth message is an integrated application access request sent from the first network, and sends a tenth message to the sixth network function, where the tenth message is used to request obtaining EAS information. Optionally, this sixth network function is an SMF of the second network, and to distinguish it from the network functions of the first network, the sixth network function may optionally be represented as SMF2. In an embodiment of the present disclosure, optionally, the fourth network function NEF2 sends a tenth message by calling an event exposure request Nsmf_EventExposure request, and the tenth message includes: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0133] In S309, the sixth network function SMF2 obtains the accessible EAS information based on the tenth message; Alternatively, the sixth network function SMF2 obtains the accessible EAS information after making a DNS query to a DNS server via a seventh network function.

[0134] Optionally, the sixth network function SMF2 determines the DNS server based on the third information; The third piece of information is The terminal location, Application representation and An external group identifier; and EDI information.

[0135] In an embodiment of the present disclosure, the seventh network function is an EASDF of the second network, and to distinguish it from the network function of the first network, the seventh network function may be represented as EASDF2.

[0136] In this execution step, the sixth network function SMF2 queries EDI information and determines a DNS server based on at least one of the terminal location, application identifier, PLMN identifier and external group identifier in the tenth message, and then performs a DNS query to the DNS server determined by the seventh network function EASDF2, and then obtains accessible EAS information.

[0137] At S310, the sixth network function SMF2 sends an eleventh message to the fourth network function NEF2, the eleventh message including EAS information; The eleventh message is a response message to the tenth message, and optionally, the EAS information includes an IP address and / or an FQDN.

[0138] Optionally, this eleventh message is an event exposure response Nsmf_EventExposure response message.

[0139] In S311, the fourth network function NEF2 sends a seventh message to the second network function NEF1, and the seventh message includes the EAS information.

[0140] Optionally, this seventh message is a response message to the sixth message.

[0141] Alternatively, the seventh message is an event exposure response Nnef_EventExposure response message, which the fourth network function NEF2 invokes to transmit the accessible EAS information to the second network function NEF1.

[0142] In S312, after the second network function NEF1 receives the seventh message, it sends a second message to the first network function SMF1, where the second message is a response message to the first message and includes the EAS information.

[0143] Alternatively, if the first message is a Nnef_FederationEventExposure request, the second message is a Nnef_FederationEventExposure response.

[0144] At S313, the first network function SMF1 sends a twelfth message to the third network function EASDF1, where the twelfth message includes the EAS message.

[0145] Optionally, this twelfth message is a response message to the third message. The first network function SMF1 also triggers the ULCL / BP insertion process when necessary, Optionally, the twelfth message is a DNS context notify response Neasdf_DNSContext_Notify Response message.

[0146] In S314, the third network function EASDF1 sends accessible EAS information to the terminal so that the terminal performs EAS access of the second network based on the EAS information.

[0147] In the above execution process of the EAS expression method described in Example 1 of the present disclosure, during the EAS search, the first network function can use the first information to send a first request message to the second network function to request an EAS between networks, and realize the expression and access of the EAS between networks.

[0148] Referring to FIG. 4, during EAS relocation, a process of achieving inter-network deployment and access of EAS using the deployment method described in the embodiments of the present disclosure includes the following steps S401 to S411.

[0149] In S401, an EAS redirect event is triggered, for example, a first network function SMF1 triggers L-PSA insertion and EAS redirection when it determines that the UE is moving, and / or an EAS redirection is triggered by an AF, for example, the AF triggers an EAS redirection when the AF detects that the service state of the terminal UE does not meet the requirements.

[0150] At S402, the first network function SMF1 transmits a first message to the second network function NEF1 based on the first information.

[0151] Optionally, during EAS relocation, if a second rule is satisfied, the first network function SMF1 sends a first message to a second network function NEF1. The second rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and the second network providing edge application services.

[0152] It should be noted that the reason why the first network does not provide edge application services and does not provide edge application services for this application at this location is that it may not deploy an EAS and the IP may be unreachable.

[0153] Specifically, the first message is a federation event exposure request (Nnef_FederationEventExposure request), and the first network function SMF1 calls the federation event exposure request (Nnef_FederationEventExposure request) to request an update of the EAS.

[0154] Optionally, the Federal Event Service Request message (first message) may include: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0155] Using the expression method described in the embodiments of the present disclosure, the second network function NEF1 obtains the address information of the fourth network function based on this first message.

[0156] In an embodiment of the present disclosure, the fourth network function is a network function of a second network, and optionally, this fourth network function is a NEF, and to facilitate distinction from the network function of the first network, this fourth network function may be represented as NEF2.

[0157] In one of the embodiments, optionally, the second network function NEF1 can obtain address information of the fourth network function NEF2 in the following steps S403 and S404.

[0158] In S403, the second network function NEF1 sends an eighth message to the fifth network function, which is used to request a query for address information of the fourth network function NEF2.

[0159] Alternatively, as shown in FIG. 1, the fifth network function may be a Federation NRF connected between NEF1 of the first network and NEF2 of the second network, and used for querying address information between NEFs of multiple networks.

[0160] In one embodiment of the present disclosure, optionally, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0161] In S404, the second network function NEF1 receives a ninth message transmitted from the fifth network function, the ninth message being a response message to the eighth message; This ninth message includes the address information of the fourth network function NEF2.

[0162] In this step, the fifth network function Federation NRF retrieves the address information of the NEF of the corresponding network based on the PLMN identifier requested in the eighth message, i.e. determines the address information of the fourth network function NEF2, and sends a third response message to the second network function NEF1, which is used to carry the address information of the fourth network function NEF2.

[0163] In the embodiment of the present disclosure, in another embodiment, optionally, the second network function NEF1 does not need to obtain the address information of the fourth network function NEF2 through the fifth network function Federation NRF, and obtains the address information of the fourth network function NEF2 based on the second information; The second information is network pre-configured information, which is used to search for the address information of an inter-network NEF.

[0164] Specifically, address information of an NEF in a network other than the first network can be preset in an NEF in the first network, i.e., preset in the second network function NEF1, and in such an execution situation, based on the preset information, the second network function NEF1 can directly obtain address information of the fourth network function NEF2.

[0165] In S405, the second network function NEF1 sends a sixth message to the fourth network function NEF2, where the sixth message is used to request obtaining accessible EAS information.

[0166] Optionally, the second network function NEF1 sends a sixth message by calling an event exposure request Nnef_EventExposure request, and optionally the sixth message includes: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0167] In S406, the fourth network function NEF2 receives the sixth message, and determines based on the external group identifier in the sixth message that the sixth message is an integrated application access request sent from the first network, and sends a tenth message to the sixth network function, where the tenth message is used to request obtaining EAS information.

[0168] Optionally, this sixth network function is an SMF of the second network, and to distinguish it from the network functions of the first network, the sixth network function may optionally be represented as SMF2. In an embodiment of the present disclosure, optionally, the fourth network function NEF2 sends a tenth message by calling an event exposure request Nsmf_EventExposure request, and the tenth message includes: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0169] In S407, the sixth network function SMF2 obtains accessible EAS information based on the tenth message. Alternatively, the sixth network function SMF2 obtains the accessible EAS information after making a DNS query to a DNS server via a seventh network function.

[0170] Optionally, the sixth network function SMF2 determines the DNS server based on the third information; The third piece of information is The terminal location, Application representation and An external group identifier; and EDI information.

[0171] In an embodiment of the present disclosure, the seventh network function is an EASDF of the second network, and to distinguish it from the network function of the first network, the seventh network function may be represented as EASDF2.

[0172] In this execution step, the sixth network function SMF2 queries EDI information and determines a DNS server based on at least one of the terminal location, application identifier, PLMN identifier and external group identifier in the tenth message, and then performs a DNS query to the DNS server determined by the seventh network function EASDF2, and then obtains accessible EAS information.

[0173] In S408, the sixth network function SMF2 sends an eleventh message to the fourth network function NEF2, the eleventh message including EAS information; The eleventh message is a response message to the tenth message, and optionally, the EAS information includes an IP address and / or an FQDN.

[0174] Optionally, this eleventh message is an event exposure response Nsmf_EventExposure response message.

[0175] At S409, the fourth network function NEF2 sends a seventh message to the second network function NEF1, and the seventh message includes the EAS information.

[0176] Optionally, this seventh message is a response message to the sixth message.

[0177] Alternatively, the seventh message is an event exposure response Nnef_EventExposure response message, and the fourth network function NEF2 invokes this Nnef_EventExposure response message to transmit accessible EAS information to the second network function NEF1.

[0178] In S410, after the second network function NEF1 receives the seventh message, it sends a second message to the first network function SMF1, where the second message is a response message to the first message and includes the EAS information.

[0179] Alternatively, if the first message is a Nnef_FederationEventExposure request, the second message is a Nnef_FederationEventExposure response.

[0180] In S411, the first network function SMF1 executes a PDU session modification step based on the EAS information in the second message, creates a new L-PSA2 based on the terminal's location information, and conveys the EAS information returned from the second message in the PDU session modification command PDU Session Modification Command.

[0181] In S412, the AF completes information synchronization between the source EAS and the target EAS, and performs context transfer.

[0182] Specifically, the Source EAS is the EAS accessed before the EAS redirection event is triggered, and the Target EAS is the EAS corresponding to the EAS information returned by the first response message.

[0183] In the expression method described in the examples of the present disclosure, the method includes: The method further includes acquiring the service network and / or the federal capability identifier during establishment of a PDU session of the terminal.

[0184] Optionally, in the expression method, the method further comprises: The method further includes a step of the first network function SMF1 receiving the federal information sent by the second network function via a fifth message.

[0185] Optionally, in the expression method, the Federal information is An application identifier; A Data Network Access Identifier (DN Access Identifier, DNAI); a public land mobile network PLMN identifier; Delay information "latency" and a supported access method.

[0186] Optionally, in said expression method, said federal information is provided by the AF to said second network function NEF.

[0187] As shown in FIG. 5, the process of the SMF acquiring federal information using the method according to the embodiment of the present disclosure includes the following steps S510 to S540.

[0188] In S510, the AF provides federal information to the NEF, where the federal information refers to information provided by operators in the federal platform, and may be the address, configuration information, and edge application list and its location information of the NEF supported within each operator. Optionally, the federal information is: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information latency, and a supported access method.

[0189] At S520, the NEF transmits the federal information to the SMF, optionally by invoking a federal provision message, a federal parameter provision message, a federal information provision message, or the like.

[0190] At S530, the SMF stores the federation information and returns a first response message to the NEF.

[0191] At S540, the NEF sends a second response message to the AF.

[0192] An embodiment of the present disclosure further provides a method of an edge application server (EAS), which is executed by a second network function NEF1, and as shown in FIG. 6, the method includes the following step S610.

[0193] At S610, a first message sent from a first network function SMF1 is received; and / or obtaining address information of a fourth network function NEF2; and / or sending a sixth message to the fourth network function NEF2, the sixth message being used to request obtaining EAS information.

[0194] Optionally, the method further comprises: The method further includes the step of receiving a seventh message sent from the fourth network function NEF2, the seventh message including EAS information.

[0195] Optionally, the method further comprises: The method further includes the step of sending a second message to the first network function SMF1, wherein the second message includes EAS information.

[0196] Optionally, in the method, the step of obtaining address information of the fourth network function NEF2 comprises: The method includes the step of obtaining address information of the fourth network function NEF2 based on the second information.

[0197] Optionally, in the method, the second information is network pre-configured information and is used to retrieve address information of an inter-network NEF.

[0198] Optionally, the method further comprises: sending an eighth message to a fifth network function federation NRF; And / or further includes a step of receiving a ninth message sent from the fifth network function federation NRF.

[0199] Optionally, in said method, said ninth message includes address information of said fourth network function NEF2.

[0200] Optionally, in the method, the first message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0201] Optionally, in the method, the seventh message comprises: EAS IP address, and at least one of the following:

[0202] Optionally, in the method, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0203] An embodiment of the present disclosure further provides a method of an edge application server (EAS), which is performed by a fourth network function NEF2, and as shown in FIG. 7, the method includes the following step S710.

[0204] At S710, receiving a sixth message sent from a second network function NEF1, the sixth message being used to request obtaining EAS information; and / or sending a tenth message to a sixth network function SMF2, the tenth message being used to request obtaining EAS information.

[0205] Optionally, the method further comprises: The method further includes a step of receiving an eleventh message sent from the sixth network function SMF2, the eleventh message including EAS information.

[0206] Optionally, the method further comprises: The method further includes a step of transmitting the seventh message to the second network function NEF1, the seventh message including EAS information.

[0207] Optionally, in the method, the sixth message and the tenth message each include: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0208] Optionally, in the method, the eleventh message comprises: EAS IP address, and at least one of the following:

[0209] An embodiment of the present disclosure further provides an edge application server (EAS) implementation method, which is performed by a sixth network function SMF2, and as shown in FIG. 8, the method includes the following step S810.

[0210] At S810, receiving a tenth message sent from a fourth network function NEF2, the tenth message being used to request obtaining EAS information; And / or obtain EAS information based on the tenth message.

[0211] Optionally, the method further comprises: The method further includes the step of transmitting an eleventh message to the fourth network function NEF2, the eleventh message including EAS information.

[0212] Optionally, in the method, the step of obtaining EAS information based on the tenth message further comprises: The method includes obtaining the EAS information after making a DNS query to a DNS server by a seventh network function EASDF2 based on the tenth message.

[0213] Optionally, the method further comprises: The method further includes a step in which the sixth network function SMF2 determines the DNS server based on third information.

[0214] Optionally, in the method, the third information is The terminal location, Application representation and An external group identifier; and EDI information.

[0215] Optionally, in the method, the tenth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0216] An embodiment of the present disclosure further provides an implementation method of an edge application server (EAS), which is performed by a fifth network function federation NRF, and as shown in FIG. 9, the method includes the following step S910.

[0217] At S910, receiving an eighth message sent from the second network function SMF1; And / or sending a ninth message to the second network function SMF1.

[0218] Optionally, in said method, said ninth message includes address information of a fourth network function NEF2.

[0219] Optionally, in the method, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0220] In addition, in the expression method described in the examples of the present disclosure, for specific embodiments and processes applied to the second network function, fourth network function, sixth network function, and fifth network function, reference may be made to the detailed description of the case where the method is applied to the first network function in conjunction with Figures 3 and 4, and the description will be omitted here.

[0221] Example 2 In the expression method described in Example 2 of the present disclosure, during EAS search or EAS relocation, the first network function uses the first information to send a reselection network instruction to the terminal, instructing the terminal to access other networks in a reselection network manner, so as to realize inter-network expression and access of EAS.

[0222] In the expression method described in the embodiment 2 of the present disclosure, in one embodiment thereof, which is performed by the first network function SMF1, as shown in FIG. 10, the method includes the following step S1010.

[0223] In S1010, during EAS search or EAS relocation, send reselection network indication information to the terminal based on the first information.

[0224] Optionally, the reselection network indication information includes network information of the reselection network. Optionally, the reselection network indication information is used to indicate related information of a network to be reaccessed by the terminal, and may be at least one of a PLMN Identifier (ID), Single Network Slice Selection Assistance Information (S-NSSAI), Network Slice Selection Assistance Information (NSSAI), and a Data Network Name (DNN).

[0225] Using the expression method described in this embodiment, the first network function uses the first information to send reselection network instruction information to the terminal, instructing the terminal to access other networks in a reselection network manner, thereby realizing inter-network expression and access of EAS.

[0226] In the first embodiment of the present disclosure, the first network function is a network function of a first network, and optionally, the first network function is an SMF. In order to easily distinguish from the network function of a second network, this first network function can be indicated as SMF1.

[0227] In one embodiment thereof, during the EAS search, the method comprises: The method further includes receiving the first message sent from the second network function.

[0228] The second network function receives a second message, matches the second message with a first rule, and sends the first message to the first network function SMF1.

[0229] Optionally, during the EAS search, the step of the first network function SMF1 sending reselection network indication information to the terminal based on the first message includes: The method includes a step of sending reselection network indication information to the terminal based on the first information after the first network function SMF1 receives the first message.

[0230] Optionally, the first rule is: The first network does not provide an edge application service based on the location of the terminal; and The requesting application of the second message is a federated application, and the second network provides an edge application service.

[0231] In Example 2 of the present disclosure, optionally, the second network function may be an EASDF, and this second network function may be represented as EASDF1 to easily distinguish it from the network function of the second network.

[0232] Alternatively, the first message and the second message may each be a DNS query message.

[0233] In the embodiment of the method described in the present disclosure, in one embodiment, during an EAS search, the terminal sends a second message (DNS query message) to a second network function EASDF1, and the second network function EASDF1 performs rule matching, matches the second message to a first rule, and sends a first message to a first network function SMF1, whereby the first network function SMF1 sends reselection network indication information to the UE based on the first message and the first information.

[0234] In the method according to the embodiment 2 of the present disclosure, in another embodiment, optionally, during EAS relocation, the step of sending a reselection network instruction to the terminal based on the first information includes: During EAS relocation, on the condition that the second rule is satisfied, reselection network indication information is sent to the terminal based on the first information. The second rule is: AF triggers EAS redirection, The terminal moves.

[0235] Specifically, when the above second rule is detected, the first network function SMF1 transmits reselection network instruction information to the terminal based on the first information.

[0236] Optionally, in an embodiment of the present disclosure, the method further comprises: If an EAS redirection condition is met, the method further includes obtaining redirectable EAS information and / or a PLMN ID list sent from the AF.

[0237] Optionally, the first information is: Federal information and A Federal Capability Identifier for the terminal; and A service network; and a latency list of the operator.

[0238] Optionally, the method further comprises: The method further includes acquiring the service network and / or the federal capability identifier during establishment of a PDU session of the terminal.

[0239] Optionally, the method further comprises: The method further includes a step of the first network function SMF1 receiving the federal information sent by a third network function via a third message.

[0240] Optionally, in the method, the federal information comprises: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information latency, and a supported access method.

[0241] Optionally, in said method, said federal information is provided to said second network function NEF by an AF.

[0242] In the embodiment of the present disclosure, the specific implementation process of providing federal information to the second network function NEF by the AF and providing the federal information to the SMF by the NEF can refer to FIG. 5, and the description is omitted here.

[0243] 12 and 13 together below illustrate a specific embodiment of using the expression method described in Example 2 of the present disclosure during EAS search and EAS rearrangement.

[0244] Referring to FIG. 12, the process of realizing inter-network expression and access of EAS during EAS search using the expression method described in the second embodiment of the present disclosure includes the following steps S1201 to S1205.

[0245] In S1201, the terminal UE completes the establishment of a PDU session in a first network, and optionally, during the PDU session establishment, a serving network and / or a federal capability identifier of the terminal is carried in the SM context information of the PDU session establishment process. Optionally, the serving network may include, but is not limited to include, only a PLMN ID.

[0246] In S1202, after performing EASDF1 (second network function) selection of the first network, the terminal UE sends a second message to the second network function EASDF1, optionally, the second message is a DNS query request.

[0247] In S1203, the second network function EASDF1 matches the second message to a first rule based on the second message and sends a first message to the first network function SMF1, the first message being a DNS message, and the SMF sends a response to the first message to the second network function EASDF1; Optionally, the first rule is: The first network does not provide an edge application service based on the location of the terminal; and The requesting application of the second message is a federated application, and the second network provides an edge application service.

[0248] In S1204, the first network function SMF1 sends reselection network indication information to the terminal through the first information based on the first message, and optionally, the reselection network indication information includes network information of the reselection network.

[0249] Specifically, the first network function SMF1 filters a network list of other operators that can provide services to the terminal based on at least one of the federal information in the first information, the federal capability identifier of the terminal, and the serving network, and also selects an operator network (second network) with the shortest latency from the network list of other operators based on the latency list of each operator fed back from the AF to provide services to the terminal.

[0250] According to the above filtering process, if it is determined that the network to which the optimal EAS2 capable of providing service to the terminal belongs only supports access via a second network (e.g., 5GC2), i.e., there is no direct information connection between the first network (e.g., 5GC1) and the EAS2, a reselection network indication is sent to the terminal, and the reselection network indication includes network information of the reselection network, for example, including the PLMN ID of the reselection network, so that the terminal can establish a PDU session in the network corresponding to the network information (the second network) and search for or express an appropriate EAS by the EASDF2 of the second network.

[0251] In S1205, the terminal establishes a PDU session in a network (second network) corresponding to the network information phase, and searches for or expresses an appropriate EAS by the EASDF2 of the second network.

[0252] Alternatively, the terminal can send a DNS request message to the EASDF2 to search for or express an appropriate EAS through the EASDF2, and the specific implementation process is not described here.

[0253] Using the above execution process, during EAS search, the first network function SMF1 filters second networks that can provide EAS services to the terminal based on the first information, and sends a reselection network instruction to the terminal, instructing the terminal to establish a PDU session in the network corresponding to the network information phase indicated by the reselection network instruction so as to search for or express EAS, thereby realizing EAS expression or access between networks.

[0254] Referring to FIG. 13, during EAS relocation, a process for achieving inter-network expression and access of EAS using the expression method described in Example 2 of the present disclosure includes the following steps S1301 to S1305.

[0255] In S1301, an EAS redirect event is triggered, where a first network function SMF1 detects a UE's movement and / or an EAS redirect is triggered by an AF, for example, when the AF detects that the service state of the terminal UE does not satisfy the requirements. The AF triggers an EAS redirect. Optionally, when an EAS redirect event is triggered, the AF sends first notification information to a first network function SMF1, where the first notification information includes accessible EAS information and / or a PLMN ID list.

[0256] In one embodiment thereof, optionally, if the first network function SMF1 detects the movement of the UE, the method further comprises: The method may further include a step of the first network function SMF1 sending location report information to the AF to report the current location of the terminal. The AF transmits first notification information to the first network function SMF1 based on this location report information transmitted from the first network function SMF1.

[0257] In S1302, the first network function SMF1 sends reselected network indication information to the terminal based on the first information, and optionally, the reselected network indication information includes network information of the reselected network.

[0258] Specifically, the first network function SMF1 filters a network list of other operators that can provide services to the terminal based on at least one of the federal information in the first information, the federal capability identifier of the terminal, and the serving network, and also selects an operator network (second network) with the shortest latency from the network list of other operators based on the latency list of each operator fed back from the AF to provide services to the terminal.

[0259] According to the above filtering process, if it is determined that the network to which the optimal EAS2 capable of providing service to the terminal belongs only supports access via a second network (e.g., 5GC2), i.e., no direct information can be connected between the first network (e.g., 5GC1) and the EAS2, a reselection network indication is sent to the terminal, and the reselection network indication includes network information of the reselection network, for example, including the PLMN ID of the reselection network, so that the terminal can establish a PDU session in the network corresponding to the network information (the second network) and access the corresponding EAS.

[0260] In S1303, the terminal attaches to the second network based on the reselection network indication information.

[0261] At S1304, the terminal establishes a PDU session in the second network.

[0262] At S1305, the terminal accesses the EAS of the second network through the PDU session established in the second network.

[0263] Using the above execution process, during EAS search or EAS relocation, the first network function uses the first information to send a reselection network instruction to the terminal, instructing the terminal to access other networks in a reselection network manner, and realizing inter-network emergence and access of EAS.

[0264] An embodiment of the present disclosure further provides a method for implementing an edge application server (EAS), which is executed by a terminal, and as shown in FIG. 11, the method includes the following step S1110.

[0265] In S1110, during EAS search or EAS relocation, reselection network instruction information sent from the first network function SMF1 is received.

[0266] Optionally, the method further comprises: The method further includes establishing a PDU session in a network indicated by the reselection network indication information and performing EAS access.

[0267] In the implementation method described in the embodiments of the present disclosure, the specific execution process applied to the terminal can be combined with FIG. 12 and FIG. 13, and the description is omitted here.

[0268] It should be noted that the specific names of messages or information (e.g., the first message to the fourteenth message, e.g., the first information to the third information, e.g., the federal information, etc.) listed in the embodiments of the present disclosure are merely some examples. In practical situations, those skilled in the art can also give other names to the information or messages, and the present disclosure is not specifically limited thereto.

[0269] An embodiment of the present disclosure further provides a network device, the network device being a first network function, the network device including a transceiver; The transceiver is A first message is sent to a second network function.

[0270] Optionally, in the network device, the step of the first network function sending the first message to the second network function NEF1 comprises: During EAS search or EAS relocation, the first network function sends a first message to a second network function based on the first information.

[0271] Optionally, in the network device, after the first network function transmits the first message to a second network function, the transceiver further comprises: receiving a second message sent from the second network function; The second message includes EAS information.

[0272] Optionally, in the network device, the transceiver further comprises: During the EAS search, a third message sent from a third network function is received.

[0273] Optionally, in the network device, the transceiver further comprises: The third network function receives a fourth message, the fourth message matches a first rule, and sends the third message to the first network function.

[0274] Optionally, in said network device, said first rule is a DNS message processing rule.

[0275] Optionally, in the network device, the first network function sending a first message to a second network function comprises: The first network function sends the first message to the second network function based on the third message.

[0276] Optionally, in the network device, the first rule comprises: Based on the location of the terminal, an edge application service is not provided in a first network; and The application of the fourth message request is a cooperative application; and the second network providing edge application services.

[0277] Optionally, in the network device, during EAS relocation, the first network function sending a first message to a second network function includes: During EAS relocation, if a second rule is satisfied, the first network function sends a first message to a second network function.

[0278] Optionally, in the network device, the second rule comprises: Based on the location of the terminal, an edge application service is not provided in a first network; and the second network providing edge application services.

[0279] Optionally, in the network device, the transceiver further comprises: During an EAS search, networks are filtered based on the first information to select an EAS that can provide service to the terminal.

[0280] Optionally, in the network device, the first message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0281] Optionally, in the network device, the first information is: Federal information and A Federal Capability Identifier for the terminal; and A service network; and a latency list of the operator.

[0282] Optionally, in the network device, the transceiver further comprises: The service network and / or the federal capability identifier is obtained during establishment of a PDU session of the terminal.

[0283] Optionally, in the network device, the method further comprises: The method further includes the step of the first network function receiving the federal information sent by a second network function via a fifth message.

[0284] Optionally, in the network device, the federal information comprises: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information "latency" and a supported access method.

[0285] Optionally, in said network device, said federal information is provided by an AF to said second network function NEF.

[0286] Optionally, in the network device, after receiving a second message transmitted from the second network function during EAS search or relocation, the transceiver further comprises: During PDU session changes, insert L-PSA if necessary.

[0287] Optionally, in the network device, after receiving a second message transmitted from the second network function during EAS search or relocation, the transceiver further comprises: The EAS information is carried in the PDU Session Modify command.

[0288] Optionally, in the network device, the second message comprises: EAS IP address, EAS FQDN and at least one of the following:

[0289] An embodiment of the present disclosure further provides a network device, the network device being a second network function, the network device including a transceiver; The transceiver is receiving a first message sent from a first network function; and / or acquiring address information of a fourth network function; and / or sending a sixth message to the fourth network function, the sixth message being used to request obtaining EAS information.

[0290] Optionally, in the network device, the transceiver further comprises: A seventh message sent from the fourth network function is received, the seventh message including EAS information.

[0291] Optionally, in the network device, the transceiver further comprises: A second message is sent to the first network function, the second message including the EAS information.

[0292] Optionally, in the network device, obtaining address information of a fourth network function includes: and obtaining address information of a fourth network function based on the second information.

[0293] Optionally, in the network device, the second information is network pre-configured information, which is used to search for address information of an inter-network NEF.

[0294] Optionally, in the network device, the transceiver further comprises: Sending an eighth message to the fifth network function; And / or receiving a ninth message sent from the fifth network function.

[0295] Optionally, in said network device, said ninth message includes address information of said fourth network function.

[0296] Optionally, in the network device, the first message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0297] Optionally, in the network device, the seventh message comprises: EAS IP address, and at least one of the following:

[0298] Optionally, in the network device, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0299] An embodiment of the present disclosure further provides a network device, the network device being a fourth network function, the network device including a transceiver; The transceiver is receiving a sixth message sent from the second network function, the sixth message being used to request retrieval of the EAS information; and / or sending a tenth message to the sixth network function, the tenth message being used to request obtaining the EAS information.

[0300] Optionally, in the network device, the transceiver further comprises: An eleventh message sent from the sixth network function is received, and the eleventh message includes EAS information.

[0301] Optionally, in the network device, the transceiver further comprises: The seventh message is sent to the second network function NEF1, and the seventh message includes EAS information.

[0302] Optionally, in the network device, the sixth message and the tenth message each include: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0303] Optionally, in the network device, the eleventh message comprises: EAS IP address, and at least one of the following:

[0304] An embodiment of the present disclosure further provides a network device, the network device being a sixth network function, the network device including a transceiver; The transceiver is receiving a tenth message sent from the fourth network function, the tenth message being used to request retrieval of the EAS information; And / or obtain EAS information based on the tenth message.

[0305] Optionally, in the network device, the transceiver further comprises: An eleventh message is sent to the fourth network function, the eleventh message including the EAS information.

[0306] Optionally, in the network device, obtaining EAS information based on the tenth message includes: The method includes obtaining the EAS information after making a DNS query to a DNS server by a seventh network function based on the tenth message.

[0307] Optionally, in the network device, the transceiver further comprises: The sixth network function determines the DNS server based on the third information.

[0308] Optionally, in the network device, the third information is: The terminal location, Application representation and An external group identifier; and EDI information.

[0309] Optionally, in the network device, the tenth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0310] An embodiment of the present disclosure further provides a network device, the network device being a fifth network function, the network device including a transceiver; The transceiver is receiving an eighth message sent from the second network function; and / or transmitting a ninth message to the second network function.

[0311] Optionally, in said network device, said ninth message includes address information of a fourth network function.

[0312] Optionally, in the network device, the eighth message comprises: The terminal location, An application identifier; a public land mobile network PLMN identifier; and an external group identifier.

[0313] An embodiment of the present disclosure further provides a network device, the network device being a first network function, the network device including a transceiver; The transceiver is During the EAS search or EAS relocation, based on the first information, send reselection network indication information to the terminal.

[0314] Optionally, in the network device, during EAS searching, the transceiver further comprises: A first message sent from a second network function is received.

[0315] Optionally, in the network device, during EAS searching, the transceiver further comprises: The second network function receives a second message, matches the second message to a first rule, and sends the first message to the first network function.

[0316] Optionally, in the network device, during the EAS search, the first network function sends reselection network instruction information to the terminal based on the first information; After the first network function receives the first message, the first network function sends reselection network indication information to the terminal based on the first information.

[0317] Optionally, in the network device, the first rule comprises: The first network does not provide an edge application service based on the location of the terminal; and The requesting application of the second message is a federated application, and the second network provides an edge application service.

[0318] Optionally, in the network device, during EAS relocation, based on the first information, sending reselection network indication information to the terminal.

[0319] During EAS relocation, send reselection network indication information to the terminal based on the first information under a condition that the second rule is satisfied.

[0320] Optionally, in the network device, the second rule comprises: AF triggers EAS redirection, The terminal moves.

[0321] Optionally, in the network device, the transceiver further comprises: The network list is filtered to select the EAS based on the first information.

[0322] Optionally, in the network device, the first information is: Federal information and A Federal Capability Identifier for the terminal; and A service network; and a latency list of the operator.

[0323] Optionally, in the network device, the transceiver further comprises: The service network and / or the federal capability identifier is obtained during establishment of a PDU session of the terminal.

[0324] Optionally, in the network device, the transceiver further comprises: The first network function receives the federal information transmitted by a third network function via a third message.

[0325] Optionally, in the network device, the federal information comprises: An application identifier; DNAI and a public land mobile network PLMN identifier; Delay information "latency" and a supported access method.

[0326] Optionally, in said network device, said federation information is provided to said second network function by an AF.

[0327] An embodiment of the present disclosure further provides a terminal, the terminal including a transceiver; The transceiver is Receive reselection network indication information sent from the first network function during EAS search or EAS relocation.

[0328] Optionally, the terminal further comprises a processor, A PDU session is established in the network indicated by the reselection network indication information, and EAS access is performed.

[0329] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a first network function, the device comprising: A first transceiver unit for transmitting a first message to a second network function.

[0330] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment when the discovering method is applied to a first network function, and the description is omitted here.

[0331] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a second network function, comprising: receiving a first message sent from a first network function; and / or acquiring address information of a fourth network function; and / or sending a sixth message to the fourth network function, the sixth message including a second transceiver unit used to request obtaining EAS information.

[0332] In the embodiment of the present disclosure, the discovery device corresponds to a specific embodiment when the discovery method is applied to a second network function, and the description is omitted here.

[0333] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a fourth network function, and the device includes: receiving a sixth message sent from the second network function, the sixth message being used to request retrieval of the EAS information; and / or sending a tenth message to the sixth network function, the tenth message including the third transceiver unit used to request obtaining the EAS information.

[0334] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment in which the discovering method is applied to a fourth network function, and the description is omitted here.

[0335] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a sixth network function, and the device includes: receiving a tenth message sent from the fourth network function, the tenth message being used to request retrieval of the EAS information; and / or a fourth transceiver unit for obtaining EAS information based on the tenth message.

[0336] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment when the discovering method is applied to a sixth network function, and the description is omitted here.

[0337] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a fifth network function, and the device includes: receiving an eighth message sent from the second network function; and / or a fifth transceiver unit for transmitting a ninth message to the second network function.

[0338] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment when the discovering method is applied to a fifth network function, and the description is omitted here.

[0339] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, adapted for a first network function, the device comprising: and a first transceiver unit for sending reselection network indication information to the terminal based on the first information during EAS search or EAS relocation.

[0340] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment when the discovering method is applied to the first network function in the second embodiment, and the description is omitted here.

[0341] An embodiment of the present disclosure further provides an edge application server (EAS) implementation device, which is applied to a terminal, and includes: and a second transceiver unit for receiving reselection network indication information sent from the first network function during EAS search or EAS relocation.

[0342] In the embodiment of the present disclosure, the discovering device corresponds to a specific embodiment in which the discovering method is applied to the terminal of embodiment 2, and the description is omitted here.

[0343] An embodiment of the present disclosure further provides a network device including a transceiver, a processor, a memory, and a program or instructions stored in the memory and executable by the processor, whereby when the processor executes the program or instructions, it realizes any of the discovery methods described above.

[0344] Alternatively, the network device may be any of the network functions or terminals described above, and the specific implementation process when the corresponding processor executes the discovery method may refer to the above detailed description, and the description will be omitted here.

[0345] An embodiment of the present disclosure further provides a readable storage medium on which a program or instruction is stored, which, when executed by a processor, realizes the steps in the above-mentioned EAS discovery method and can achieve the same technical effect, and in order to avoid duplication, the description will be omitted here.

[0346] The processor is the processor in the network device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a computer read-only memory (abbreviated as ROM), a random access memory (abbreviated as RAM), a magnetic disk, or an optical disk.

[0347] Further, the terminals described in this specification include, but are not limited to, smartphones, tablets, etc., and many of the functional components described are referred to as modules to more specifically emphasize their implementation independence.

[0348] In embodiments of the present disclosure, modules can be implemented in software to be executed by various types of processors. For example, an executable code module of an identifier can include one or more physical or logical blocks of computer instructions and can be configured as, for example, an object, a process, or a function. Nevertheless, the executable code of an identified module need not be physically located together and can include different instructions stored in different bits that, when logically combined, constitute a module and can realize the module's predetermined purpose.

[0349] In practice, an executable code module may be a single or multiple instructions and may be distributed across multiple different code segments, across different programs, and across multiple memory devices. Similarly, operational data may be identified in a module and implemented according to any suitable format and may be incorporated into any suitable type of data structure. The operational data may be collected as a single data set or may be distributed in different locations (contained in different storage devices), and may exist at least partially only as electronic signals on a system or network.

[0350] When a module can be realized using software, considering the level of existing hardware processes, for a module that can be realized by software, a person skilled in the art can build a corresponding hardware circuit to realize the corresponding function without considering the cost, and the hardware circuit includes a conventional very large scale integrated (VLSI) circuit or gate array, and existing semiconductors such as logic chips, transistors or other discrete elements. The module can also be realized by a programmable hardware device such as a field programmable gate array, a programmable array logic, a programmable logic device, etc.

[0351] The above exemplary embodiments are described with reference to these drawings, and many different configurations and embodiments may be implemented without departing from the spirit and teachings of the present disclosure, and therefore the present disclosure should not be construed as a limitation of the exemplary embodiments proposed herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will convey the scope of the present disclosure to those skilled in the art. In these diagrams, the dimensions and relative dimensions of the components may be exaggerated for clarity. The terminology used herein is intended to describe specific exemplary embodiments, and is not limiting. As used herein, the singular forms "a," "one," and "the" are intended to incorporate these plural forms unless the context clearly indicates otherwise. It is further understood that the terms "include" and / or "comprises," as used herein, refer to the presence of said features, integers, steps, operations, members, and / or components, but do not exclude the presence or increase of one or more other features, integers, steps, operations, members, components, and / or families thereof. Unless otherwise indicated, a stated range of values ​​includes the upper and lower limits of the range, and any subranges therebetween.

[0352] It should be noted that what has been described above is the preferred embodiment of the present disclosure, and those skilled in the art may make some improvements and modifications without departing from the principles described in the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.

Claims

1. 1. A method for Edge Application Server (EAS) manifestation performed by a first network function, comprising: A method of developing an edge application server (EAS), comprising the step of the first network function sending a first message to a second network function.

2. The step of transmitting a first message from a first network function to a second network function includes:

2. The method of claim 1, further comprising the step of the first network function sending a first message to a second network function based on first information during EAS search or EAS relocation.

3. After the first network function transmits the first message to a second network function, the method further comprises: receiving a second message sent from the second network function; The method for implementing an edge application server (EAS) according to claim 1 or 2, wherein the second message includes EAS information.

4. The method of claim 1 , further comprising receiving a third message sent from a third network function during an EAS search.

5. 5. The method of claim 4, further comprising the step of the third network function receiving a fourth message, the fourth message matching a first rule, and sending the third message to the first network function.

6. The method of claim 5 , wherein the first rule is a DNS message processing rule.

7. The step of transmitting a first message from the first network function to a second network function includes:

5. The method of claim 4, further comprising the step of the first network function sending the first message to the second network function based on the third message.

8. The first rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and the application of the fourth message request is a cooperative application; and The second network provides an edge application service; and The method of claim 5 , further comprising at least one of:

9. During EAS relocation, the first network function sending a first message to a second network function includes:

3. The method of claim 2, further comprising the step of the first network function sending a first message to a second network function during EAS relocation if a second rule is satisfied.

10. The second rule is: Based on the location of the terminal, an edge application service is not provided in a first network; and The second network provides an edge application service; and 10. The method of claim 9, further comprising at least one of:

11. The method of claim 2, further comprising: during EAS search, filtering a network based on the first information to select an EAS that can provide services to the terminal.

12. The first message comprises: The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; The method of claim 1 , further comprising at least one of:

13. The first information is Federal information and A Federal Capability Identifier for the terminal; and A service network; 3. The method of claim 2, further comprising at least one of: a. a latency list of operators; and b. a latency list of operators.

14. The method of claim 13, further comprising obtaining the service network and / or the federal capability identifier during a PDU session establishment of a terminal.

15. 14. The method of claim 13, further comprising the step of the first network function receiving the federation information sent by a second network function via a fifth message.

16. The Federal Information states: An application identifier; A Data Network Access Identifier (DNAI); A public land mobile network (PLMN) identifier; Delay information "latency" and Supported access methods, 16. The method of claim 15, further comprising at least one of:

17. The method of claim 15, wherein the federation information is provided to the second network function (NEF) by an AF.

18. After receiving a second message transmitted from the second network function during EAS search or relocation, the method includes: The method for developing an Edge Application Server (EAS) according to claim 3, further comprising the step of inserting a Local PDU Session Anchor (L-PSA) as necessary during modification of a PDU session.

19. After receiving a second message transmitted from the second network function during EAS search or relocation, the method includes: The method of claim 3, further comprising carrying EAS information in a PDU session modification command.

20. The second message comprises: EAS IP address; EAS Full Domain Name FQDN, The method of claim 3 , further comprising at least one of:

21. An edge application server (EAS) method executed by a second network function NEF1, comprising: receiving a first message sent from a first network function; and / or obtaining address information of a fourth network function; And / or a method of an edge application server (EAS) including a step of sending a sixth message to the fourth network function, the sixth message being used to request acquisition of EAS information.

22. 22. The edge application server (EAS) method of claim 21, further comprising the step of receiving a seventh message sent from the fourth network function, the seventh message including EAS information.

23. 22. The edge application server (EAS) method of claim 21, further comprising the step of sending a second message to the first network function, the second message including EAS information.

24. The step of acquiring address information of the fourth network function includes:

22. The edge application server (EAS) method of claim 21, further comprising obtaining address information of a fourth network function based on the second information.

25. 25. The method of claim 24, wherein the second information is network pre-configured information and is used to search for address information of an inter-network NEF.

26. sending an eighth message to a fifth network function; and / or a ninth message sent from the fifth network function.

27. 27. The edge application server (EAS) method of claim 26, wherein the ninth message includes address information of the fourth network function.

28. The twenty-first message includes: The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; 22. The edge application server (EAS) method of claim 21, comprising at least one of:

29. The seventh message may include: EAS IP address; EAS Fully Qualified Domain Name (FQDN); 23. The edge application server (EAS) method of claim 22, further comprising at least one of the following information:

30. The eighth message is The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; 27. The edge application server (EAS) method of claim 26, comprising at least one of:

31. 16. An edge application server (EAS) method performed by a fourth network function, comprising: receiving a sixth message transmitted from a second network function, the sixth message being used to request acquisition of EAS information; and / or a step of sending a tenth message to a sixth network function, the tenth message being used to request acquisition of EAS information.

32. 32. The edge application server (EAS) method of claim 31, further comprising the step of receiving an eleventh message sent from the sixth network function, the eleventh message including EAS information.

33. 32. The edge application server (EAS) method of claim 31, further comprising the step of: sending the seventh message to the second network function (NEF1), the seventh message including EAS information.

34. The sixth message and the tenth message each include: The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; 32. The edge application server (EAS) method of claim 31, further comprising at least one of the following information:

35. The eleventh message includes: EAS IP address; 33. The Edge Application Server (EAS) method of claim 32, further comprising at least one of the following information: an EAS fully qualified domain name (FQDN);

36. A method for implementing an edge application server (EAS) performed by a sixth network function, comprising: receiving a tenth message transmitted from a fourth network function, the tenth message being used to request acquisition of EAS information; And / or a method for implementing an edge application server (EAS), comprising the step of obtaining EAS information based on the tenth message.

37. 37. The method of claim 36, further comprising the step of sending an eleventh message to the fourth network function, the eleventh message including EAS information.

38. The step of acquiring EAS information based on the tenth message includes:

37. The method of claim 36, further comprising: obtaining the EAS information after making a DNS query to a DNS server by a seventh network function based on the tenth message.

39. 40. The method of claim 38, further comprising the sixth network function determining the DNS server based on third information.

40. The third information is The terminal location, Application representation and An external group identifier; 40. The method of claim 39, further comprising at least one of: a.

41. The tenth message is: The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; 37. The method of claim 36, comprising at least one of:

42. A method for implementing an edge application server (EAS) performed by a fifth network function. receiving an eighth message sent from the second network function; and / or a step of transmitting a ninth message to the second network function.

43. 43. The method of claim 42, wherein the ninth message includes address information of a fourth network function.

44. The eighth message may include: The terminal location, An application identifier; A public land mobile network (PLMN) identifier; An external group identifier; 43. The method of claim 42, further comprising at least one of:

45. 1. A method for Edge Application Server (EAS) manifestation performed by a first network function, comprising: A method for implementing an edge application server (EAS), comprising: sending reselection network instruction information to a terminal based on first information during EAS search or EAS relocation.

46. During EAS search, the expression method comprises:

46. ​​The method of claim 45, further comprising receiving the first message sent from the second network function.

47. During EAS search, the expression method comprises:

47. The method of claim 46, further comprising the step of the second network function receiving a second message, matching the second message to a first rule, and sending the first message to the first network function.

48. During the EAS search, the first network function sends reselection network indication information to the terminal based on the first information, 47. The method of claim 46, further comprising the step of: after a first network function receives the first message, sending reselection network instruction information to a terminal based on the first information.

49. The first rule is: Based on the location of the terminal, the first network does not provide an edge application service; and The request application of the second message is a cooperative application, and a second network provides an edge application service; and 48. The method of claim 47, comprising at least one of:

50. During EAS relocation, the step of sending reselection network indication information to the terminal based on the first information includes:

46. ​​The method of claim 45, further comprising the step of: sending reselection network instruction information to the terminal based on the first information, under a condition that the second rule is satisfied, during EAS relocation.

51. The second rule is: AF triggers EAS redirection; and The device moves, 51. The method of claim 50, comprising at least one of:

52. 46. ​​The method of claim 45, further comprising filtering the network list to select an EAS based on the first information.

53. The first information is Federal information and A Federal Capability Identifier for the terminal; and A service network; A latency list of operators; 53. The method of claim 45 or 52, comprising at least one of:

54. 54. The method of claim 53, further comprising obtaining the service network and / or the federal capability identifier during a terminal PDU session establishment.

55. 54. The method of claim 53, further comprising the step of the first network function receiving the federation information sent by a third network function via a third message.

56. The Federal Information states: An application identifier; DNAI and A public land mobile network (PLMN) identifier; Delay information "latency" and Supported access methods, 56. The method of claim 55, comprising at least one of:

57. 56. The method of claim 55, wherein the federation information is provided to the second network function by an AF.

58. A method for implementing an edge application server (EAS) executed by a terminal, comprising: A method for developing an edge application server (EAS) includes receiving reselection network indication information sent from a first network function during an EAS search or EAS relocation.

59. 59. The method of claim 58, further comprising: establishing a PDU session in a network indicated by the reselection network indication information and performing EAS access.

60. A network device, the network device being a first network function and including a transceiver; The network device, wherein the transceiver transmits a first message to a second network function.

61. a network device, the network device being a second network function and including a transceiver; The transceiver includes: receiving a first message sent from a first network function; and / or obtaining address information of a fourth network function; and / or a network device that transmits a sixth message to the fourth network function, the sixth message being used to request obtaining EAS information.

62. a network device, the network device being a fourth network function and including a transceiver; The transceiver includes: receiving a sixth message sent from a second network function, the sixth message being used to request acquisition of EAS information; and / or a network device that transmits a tenth message to a sixth network function, the tenth message being used to request acquisition of EAS information.

63. a network device, the network device being a sixth network function and including a transceiver; The transceiver includes: receiving a tenth message sent from a fourth network function, the tenth message being used to request acquisition of EAS information; And / or a network device that obtains EAS information based on the tenth message.

64. A network device, the network device being a fifth network function, the network device including a transceiver; The transceiver includes: receiving an eighth message sent from the second network function; And / or a network device sending a ninth message to the second network function.

65. A network device, the network device being a first network function and including a transceiver; The transceiver includes: A network device that transmits reselection network instruction information to a terminal based on the first information during EAS search or EAS relocation.

66. A terminal including a transceiver; The transceiver includes: A terminal that receives reselection network instruction information sent from a first network function during EAS search or EAS relocation.

67. An edge application server (EAS) implementation device for a first network function, comprising: An edge application server (EAS) manifestation device including a first transceiver unit for transmitting a first message to a second network function.

68. An edge application server (EAS) implementation device for a second network function, comprising: a second transceiver unit; The second transceiver unit comprises: receiving a first message sent from a first network function; and / or obtaining address information of a fourth network function; and / or an edge application server (EAS) manifestation device for sending a sixth message to the fourth network function, the sixth message being used to request obtaining EAS information.

69. A device for realizing an edge application server (EAS) applied to a fourth network function, a third transceiver unit; The third transceiver unit comprises: receiving a sixth message sent from the second network function to request obtaining the EAS information; and / or an edge application server (EAS) manifestation device that transmits a tenth message to a sixth network function, the tenth message being used to request obtaining EAS information.

70. A sixth network function is applied to an edge application server (EAS) realization device, a fourth transceiver unit; The fourth transceiver unit comprises: receiving a tenth message sent from a fourth network function, the tenth message being used to request acquisition of EAS information; And / or an edge application server (EAS) expression device that obtains EAS information based on the tenth message.

71. A fifth network function is applied to an edge application server (EAS) realization device, a fifth transceiver unit; The fifth transceiver unit comprises: receiving an eighth message sent from the second network function; And / or an edge application server (EAS) manifestation device that sends a ninth message to the second network function.

72. An edge application server (EAS) implementation device for a first network function, comprising: An edge application server (EAS) manifestation device, comprising: a first transceiver unit for sending reselection network instruction information to a terminal based on first information during EAS search or EAS relocation.

73. An edge application server (EAS) implementation device applied to a terminal, comprising: An edge application server (EAS) manifestation device including a second transceiver unit for receiving reselection network instruction information sent from the first network function during EAS search or EAS relocation.

74. 1. A network device, comprising:

60. A network device comprising a transceiver, a processor, a memory, and a program or instructions stored in the memory and executable by the processor, the program or instructions implementing the discovery method of any one of claims 1 to 59 when the processor executes the program or instructions.

75. A readable storage medium on which a program or instruction is stored, A readable storage medium, the program or instructions which, when executed by a processor, implement the steps in the discovery method of any one of claims 1 to 59.

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