Information sending method, apparatus, system, and storage medium

Abstract

The present disclosure provides an information sending method, device, system and storage medium, and relates to the field of wireless communication. The method comprises the following steps: after a first network SEPP receives a service message, identifying a destination identifier carried in a target domain name in the service message; and sending the service message to a second network SEPP corresponding to the destination according to a PLMN identifier and the destination identifier. In the present disclosure, when the SEPP forwards the service message, the destination identifier is identified, and then the service message can be forwarded to the SEPP corresponding to the destination in the corresponding network according to the PLMN identifier and the destination identifier, so that the routing detour is reduced, and the constraint that the number of deployed SEPPs is affected by the opposite operator is eliminated.

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication, and more particularly to an information transmission method, apparatus, system, and storage medium. Background Technology

[0002] In the 5G core network inter-network roaming architecture, operators use SEPP (Security Edge Protection Proxy) to achieve 5G signaling interconnection and security protection. SEPP is based on PLMN (Public Lands Mobile Network) ID for addressing. When two operators roam together, each usually has only one PLMN ID. If the two operators have more than one SEPP or they are different, based on the PLMN ID, the data can only be forwarded to the fixed-configuration SEPP. Flexible routing is not possible, and the data cannot be forwarded to the SEPP in the region / province where the target NF (Network Function) is located. This results in routing detours, increases the difficulty of operation and maintenance, and makes the networking scheme less flexible. Summary of the Invention

[0003] One technical problem this disclosure aims to solve is to provide an information transmission method, apparatus, system, and storage medium that can reduce routing detours and overcome the constraint of the number of SEPP deployments being affected by the counterpart operator.

[0004] According to one aspect of this disclosure, an information transmission method is proposed, comprising: after receiving a service message, a first network security edge protection agent (SEPP) identifies the destination identifier carried by the target domain name in the service message; and sends the service message to a second network SEPP corresponding to the destination based on the public land mobile network (PLMN) identifier and the destination identifier.

[0005] In some embodiments, the service message includes a service discovery message sent by a first network storage function (NRF) network element, and the information sending method further includes: a first network SEPP receiving a service discovery response message returned by a second network SEPP, wherein the service discovery response message includes a destination identifier of the target NF; and sending the service discovery response message to a first network function (NF) network element through the first network NRF network element.

[0006] In some embodiments, the service message further includes a service request message sent by a first network NF element, the service request message including a destination identifier of the target NF, wherein the first network SEPP sends the service request message to the corresponding second network SEPP based on the PLMN identifier and the destination identifier.

[0007] In some embodiments, the second network SEPP sends a service request message to the target NF based on the destination identifier of the target NF.

[0008] In some embodiments, when configuring the information of the second network NRF element, the first network NRF element adds a destination identifier to the domain name information of the second network NRF element.

[0009] In some embodiments, the second network NF element carries a destination identifier when registering with the second network NRF element.

[0010] In some embodiments, the destination identifier includes at least one of a region identifier and a province identifier.

[0011] According to another aspect of this disclosure, an information transmission apparatus is also proposed, comprising: an identifier identification module configured to identify a destination identifier carried by a target domain name in a service message after receiving a service message; and a message sending and receiving module configured to send the service message to a second network security edge protection agent (SEPP) corresponding to the destination based on a Public Land Mobile Network (PLMN) identifier and a destination identifier.

[0012] In some embodiments, the service message includes a service discovery message sent by a first network storage function (NRF) network element, wherein the message transceiver module is further configured to receive a service discovery response message returned by a second network SEPP, wherein the service discovery response message includes a destination identifier of the target NF, and the service discovery response message is sent to the first network function (NF) network element through the first network NRF network element.

[0013] In some embodiments, the service message further includes a service request message sent by a first network NF element, the service request message including a destination identifier of the target NF, wherein the message sending and receiving module is configured to send the service request message to the corresponding second network SEPP according to the PLMN identifier and the destination identifier.

[0014] In some embodiments, the destination identifier includes at least one of a region identifier and a province identifier.

[0015] According to another aspect of this disclosure, an information transmission apparatus is also proposed, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the information transmission method as described above based on instructions stored in the memory.

[0016] According to another aspect of this disclosure, an information transmission system is also proposed, comprising: the aforementioned information transmission device; and a second network SEPP configured to receive service messages transmitted by the information transmission device.

[0017] In some embodiments, a second network NRF element is configured to receive a registration request from a second network NF element, the registration request including a destination identifier, and to return a service discovery response message to the second network SEPP, wherein the service discovery response message includes the destination identifier of the target NF; and a first network NRF element is configured to add the destination identifier to the domain name information of the second network NRF element when configuring the information of the second network NRF element.

[0018] According to another aspect of this disclosure, a non-transitory computer-readable storage medium is also proposed, on which computer program instructions are stored, which, when executed by a processor, implement the information transmission method as described above.

[0019] In the embodiments of this disclosure, when forwarding service messages, SEPP adds the identification of the destination identifier, thereby enabling it to forward service messages to the corresponding SEPP of the corresponding network and destination based on the PLMN identifier and the destination identifier, reducing routing detours and freeing it from the constraint that the number of SEPPs deployed is affected by the peer operator.

[0020] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0022] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 A flowchart illustrating some embodiments of the information transmission method disclosed herein;

[0024] Figure 2 Flowcharts of other embodiments of the information transmission method of this disclosure;

[0025] Figure 3 Flowcharts of other embodiments of the information transmission method of this disclosure;

[0026] Figure 4 Flowcharts of other embodiments of the information transmission method of this disclosure;

[0027] Figure 5 Flowcharts of other embodiments of the information transmission method of this disclosure;

[0028] Figure 6 Flowcharts of other embodiments of the information transmission method of this disclosure;

[0029] Figure 7 This is a schematic diagram of the structure of some embodiments of the information transmission device of this disclosure;

[0030] Figure 8 This is a schematic diagram of the structure of some other embodiments of the information transmission device of this disclosure; and

[0031] Figure 9 This is a schematic diagram of the structure of some embodiments of the information transmission system disclosed herein. Detailed Implementation

[0032] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0033] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0034] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0038] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] Figure 1 This is a flowchart illustrating some embodiments of the information transmission method disclosed herein.

[0040] In step 110, after receiving the service message, the first network SEPP identifies the destination identifier carried by the target domain name in the service message.

[0041] In some embodiments, the service message includes a service discovery message sent by a first network NRF (Network Repository Function) element, or a service request message sent by a first network NF element.

[0042] The destination identifier may include a region identifier or a province identifier.

[0043] In some embodiments, the first network is either a visited network or a home network. For example, when a home network NF element registers with an NRF element, it adds a region identifier or a province identifier to the domain name. When a visited network NRF element configures home network NRF element information, it adds a region identifier or a province identifier to the domain name information.

[0044] In step 120, the service message is sent to the second network SEPP corresponding to the destination based on the PLMN identifier and the destination identifier.

[0045] If the first network is a visiting network, then the second network is a home network; if the first network is a home network, then the second network is a visiting network.

[0046] The PLMN identifier can be used to determine the network receiving the service message, and the destination identifier can be used to determine the region or province where the SEPP receiving the service message is located.

[0047] In the above embodiments, when forwarding service messages, the identification of the destination identifier is added, so that the service message can be forwarded to the corresponding SEPP of the corresponding network and destination according to the PLMN identifier and the destination identifier, reducing routing detours and getting rid of the constraint that the number of SEPPs deployed is affected by the peer operator.

[0048] Figure 2 This is a flowchart illustrating some other embodiments of the information transmission method disclosed herein. In this embodiment, the first network is a visited network and the second network is a home network, for example.

[0049] In step 210, the visited network NF element initiates a service discovery request to the visited network NRF element.

[0050] In step 220, if the visited network NRF element determines that the service discovery request needs to be sent to the user's home network NRF, then the service discovery request is sent to the visited network SEPP.

[0051] In some embodiments, the visited network NRF element determines whether to send the service discovery request to the user's home network NRF based on information such as the number segment or DNN (Data Network Name).

[0052] Based on the current inter-network roaming pilot program, visited network NRF elements can forward information destined for external network NRF elements to designated SEPPs within the network by configuring their own network's SEPP routing information.

[0053] In step 230, the visiting network SEPP determines whether the target domain name of the service discovery request carries a regional identifier or a province identifier. If so, proceed to step 240; otherwise, proceed to step 250.

[0054] The target domain name is the domain name of the NRF network element to which it belongs.

[0055] In step 240, the visited network SEPP forwards the service discovery request to the home network SEPP of the corresponding region or province based on the PLMN identifier and the region identifier or province identifier, and then proceeds to step 260.

[0056] For example, such as Figure 3 The signaling flow shown, in SEPP1 of the VPLMN (Visited Public Land Mobile Network), a Service Request is received. The signaling is, for example, (request URI = <nf-id>.nf.region-name / province_name.5gc.mnc <mnc>.mcc <mcc>(3gppnetwork.org). The message is sent to SEPP2 of HPLMN (Home Public Land Mobile Network) based on region-name=north (region identifier is North), or to SEPP3 of HPLMN based on region-name=south (region identifier is South).

[0057] In step 250, proceed according to the existing process.

[0058] In step 260, the visited network SEPP receives a service discovery response message returned by the home network SEPP, wherein the service discovery response message includes the destination identifier of the target NF.

[0059] In some embodiments, the home network SEPP forwards the service discovery request to the home network NRF element. After receiving the request, the home network NRF element returns an NF profile containing a region identifier or province identifier in the FQDN (Fully Qualified Domain Name) field.

[0060] In the existing process, the FQDN field in the NF profile returned by the home network NRF element does not contain the area identifier or province identifier.

[0061] In step 270, the visited network SEPP sends the service discovery response message to the visited network NF element through the visited network NRF element.

[0062] like Figure 4 The signaling flow shown involves the NRF located in the serving PLMN querying parameters from the NRF located in the home PLMN through each network element. The signaling could be something like GET... / nf-instances?<query parameters> The NRF located in the home PLMN returns a 200 OK (FQDN=) response to the NRF located in the serving PLMN. <nf-id>.nf.region-name / province_name.5gc.mnc <mnc>.mcc <mcc>.3gppnetwork.org), where the FQDN field includes either region-name or Province-name (province identifier).

[0063] In the above embodiments, the routing method of SEPP is enhanced in the service discovery process to enable the forwarding of signaling messages by province or region, thereby making the 5G core network inter-network roaming interconnection scheme more flexible and reducing the difficulty of operation and maintenance.

[0064] Figure 5 This is a flowchart illustrating some other embodiments of the information transmission method disclosed herein. In this embodiment, the first network is a visited network and the second network is a home network, for example.

[0065] In step 510, the visited network NF sends a service request message to the visited network SEPP, which includes the destination identifier of the target NF.

[0066] Because the FQDN field in the NF profile returned by the service discovery process contains a region identifier or a province identifier, the target address domain name in the service request initiated by the visited network NF contains a region identifier or a province identifier.

[0067] In step 520, the visited network SEPP sends the service request message to the corresponding home network SEPP based on the PLMN identifier and the destination identifier.

[0068] In step 530, the home network SEPP sends a service request message to the target NF network element.

[0069] In the above embodiments, by adding regional and provincial identifiers in the service request process, the SEPP of the visited network can send the service request message to the SEPP of the corresponding destination network, and then forward it to the target NF network element. This reduces routing detours, lowers the difficulty of operation and maintenance, and frees the SEPP deployment number from the constraint of the peer operator.

[0070] Figure 6 This is a flowchart illustrating some other embodiments of the information transmission method disclosed herein, including a service discovery process and a service request process. In this embodiment, vNRF represents the visited network NRF, vSEPP represents the visited network SEPP, hSEPP identifies the home network SEPP, hNRF represents the home network NRF, NF Service Consumer represents an NF service user, and NF service Producer represents an NF service provider.

[0071] In step 610, when the NF service Producer registers with hNRF located in the North region, it adds a region identifier and a province identifier to the domain name.

[0072] For example, the NF service producer sends a Registration signaling message to the NRF (FQDN = <nf-id>.nf.region_name / province_name.5gc.

[0073] mnc <mnc>.mcc <mcc>.3gppnetwork.org).

[0074] In step 620, the NF Service Consumer initiates a service discovery request to vNRF. The signaling is, for example, Nnrf_NFDiscovery_Request.

[0075] In step 630, vNRF receives a service discovery request and determines, based on information such as the number segment / DNN, that it needs to be sent to the external hNRF. It then forwards the service discovery request to vSEPP, with the target URI (Uniform Resource Identifier) ​​domain name carrying the region / province identifier.

[0076] The signaling is, for example, Nnrf_NFDiscovery_Request(target domain name = <hnrf-nf-id>.nf.region-name / province_name.5gc.mnc <mnc>.mcc <mcc>.3gppnetwork.org).

[0077] In step 640, vSEPP determines that the target domain name carries region_name / province_name, and forwards the service discovery request to the corresponding region / province hSEPP based on the PLMN ID + region_name / province_name. For example, it sends the request to the hSEPP located in the Northern region.

[0078] The signaling could be, for example, Nnrf_NFDiscovery_Request(region_name = north).

[0079] In step 650, hSEPP forwards the service discovery request to the target hNRF.

[0080] The signaling could be, for example, Nnrf_NFDiscovery_Request(region_name = north).

[0081] In step 660, the target hNRF returns the target NF information to hSEPP, namely the domain name of the NF service Producer, which contains the region / province identifier.

[0082] The signaling is, for example, Nnrf_NFDiscovery_Response(NF's FQDN = <nf-id>.nf.region-name / province_name.5gc.

[0083] mnc <mnc>.mcc <mcc>.3gppnetwork.org).

[0084] In step 670, hSEPP returns a service discovery response to vSEPP, carrying the region / province identifier of the NF service Producer.

[0085] The signaling could be, for example, Nnrf_NFDiscovery_Response.

[0086] In step 680, vSEPP returns a service discovery response to vNRF, carrying the region / province identifier of the NF service Producer.

[0087] The signaling could be, for example, Nnrf_NFDiscovery_Response.

[0088] When configuring peer NRF information for this vNRF, add a region / province identifier to the domain name information.

[0089] In step 690, vNRF returns a service discovery response to the NF Service Consumer.

[0090] The signaling could be, for example, Nnrf_NFDiscovery_Response.

[0091] In step 6100, the NF Service Consumer sends a service request to vSEPP, with the target address being an NF on a different network.

[0092] The signaling is, for example, Service Request(target domain= <nf-id>.nf.region-name / province_name.5gc.mnc.mcc.3gppnetwork.org).

[0093] In step 6110, vSEPP forwards the service request message to the hSEPP of the corresponding region / province based on the PLMN ID + region_name / province_name of the target domain name.

[0094] The signaling could be, for example, a Service Request (region-name=north).

[0095] In step 6120, hSEPP sends a service request message to the target NF service Producer, i.e., sends a Service Request.

[0096] In step 6130, the target NF service Producer returns a service response ServiceResponse to hSEPP.

[0097] In step 6140, hSEPP returns a Service Response to vSEPP.

[0098] In step 6150, vSEPP returns a Service Response to the NF Service Consumer.

[0099] In the above embodiments, when the NF registers with the NRF, a region / province identifier is added to the domain name information. When the visited NRF configures the home network NRF information, a region / province identifier is added to the domain name information. When the number of SEPPs on both sides of the roaming operator is more than one or different, the SEPP adds the identification of the region / province identifier when forwarding signaling. Based on the PLMN ID + region / province identifier, the signaling is forwarded to the SEPP closest to the target NF, reducing path detours, reducing operation and maintenance complexity, and making the 5G core network inter-network roaming interconnection scheme more flexible.

[0100] Figure 7 This is a schematic diagram of the structure of some embodiments of the information transmission device of this disclosure. The device is located in the SEPP of the first network and includes an identification module 710 and a message sending and receiving module 720.

[0101] The identifier recognition module 710 is configured to identify the destination identifier carried by the target domain name in the service message after receiving the service message.

[0102] In some embodiments, the service message includes a service discovery message sent by a first network NRF element or a service request message sent by a second network NF element.

[0103] In some embodiments, the destination identifier includes a region identifier or a province identifier.

[0104] The message sending and receiving module 720 is configured to send service messages to the corresponding destination's second network SEPP based on the PLMN identifier and the destination identifier.

[0105] In some embodiments, if the service message is a service discovery message sent by a first network NRF element, the message transceiver module 720 is further configured to receive a service discovery response message returned by a second network SEPP, wherein the service discovery response message includes a destination identifier of the target NF, and the service discovery response message is sent to the first network NF element through the first network NRF element.

[0106] In some embodiments, if the service message is a service request message sent by a first network NF element, and the service request message includes a destination identifier of the target NF, then the message sending and receiving module 720 is configured to send the service request message to the corresponding second network SEPP according to the PLMN identifier and the destination identifier.

[0107] In the above embodiments, if the first network is a visited network, then the second network is a home network; if the first network is a home network, then the second network is a visited network.

[0108] In the above embodiments, by adding the identification of the destination identifier, the service message can be forwarded to the corresponding SEPP of the corresponding network and destination based on the PLMN identifier and the destination identifier. This makes the routing function of SEPP more flexible, reduces routing detours, and gets rid of the constraint that the number of SEPP deployments is affected by the peer operator.

[0109] Figure 8 The diagram below illustrates the structure of another embodiment of the information transmission apparatus of this disclosure. The apparatus 800 includes a memory 810 and a processor 820. The memory 810 can be a disk, flash memory, or any other non-volatile storage medium. The memory is used to store instructions from the above embodiments. The processor 820 is coupled to the memory 810 and can be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 820 is used to execute the instructions stored in the memory.

[0110] In some embodiments, the processor 820 is coupled to the memory 810 via a BUS bus 830. The device 800 can also be connected to an external storage system 850 via a storage interface 840 to access external data, and can also be connected to a network or another computer system (not shown) via a network interface 860. Further details are omitted here.

[0111] In this embodiment, by storing data instructions in a memory and then processing the instructions by a processor, the SEPP routing can be enhanced, reducing routing detours.

[0112] Figure 9 This is a schematic diagram illustrating the structure of some embodiments of the information transmission system disclosed herein. The system includes the information transmission device located in the first network SEPP 910 and the second network SEPP 920 as described in the above embodiments. The information transmission device has been described in detail in the above embodiments and will not be further elaborated here.

[0113] The second network SEPP 920 is configured to receive service messages sent by the first network SEPP 910. These service messages can be either service discovery messages or service request messages. The second network SEPP 920 returns a service discovery response or a service request response to the first network SEPP 910.

[0114] The system also includes a second network NRF element 930 and a first network NRF element 940.

[0115] The second network NRF element 930 is configured to receive a registration request from a second network NF element. The registration request includes a destination identifier and a service discovery response message returned to the second network SEPP, wherein the service discovery response message includes the destination identifier of the target NF.

[0116] The first network NRF element 940 is configured to add a destination identifier to the domain name information of the second network NRF element when configuring the information of the second network NRF element. When the first network NRF element 940 receives a service discovery request, it determines whether the request needs to be sent to the user's second network NRF based on information such as the number segment / DNN, and then sends the service discovery request to the SEPP of its own network.

[0117] In the above embodiments, if the first network is a visited network, then the second network is a home network; if the first network is a home network, then the second network is a visited network.

[0118] The above embodiments enable the forwarding of signaling messages by province / region, making the 5G core network inter-network roaming interconnection scheme more flexible, reducing routing detours, lowering operation and maintenance difficulty, and freeing it from the constraint of the number of SEPP deployments being affected by the counterpart operator.

[0119] In other embodiments, a computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the steps of the methods described above. Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0121] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0122] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0123] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0124] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims. < / mcc> < / mnc> < / mcc> < / mnc> < / mcc> < / mnc> < / mcc> < / mnc> < / mcc> < / mnc>

Claims

1. A method for sending information, comprising: After receiving a service message, the First Network Security Edge Protection Agent (SEPP) identifies the destination identifier carried by the target domain name in the service message. The destination identifier includes at least one of a region identifier and a province identifier, and the destination identifier is located in the fully qualified domain name field. as well as The service message is sent to the second network SEPP corresponding to the destination based on the Public Land Mobile Network (PLMN) identifier and the destination identifier. The service message includes a service discovery message sent by the first network storage function (NRF) network element, and the information sending method further includes: The first network SEPP receives a service discovery response message returned by the second network SEPP, wherein the service discovery response message includes the destination identifier of the target NF; and The service discovery response message is sent to the first network function (NF) element via the first network NRF element.

2. The information sending method according to claim 1, wherein, The service message also includes a service request message sent by the first network NF element, wherein the service request message includes the destination identifier of the target NF, wherein... The first network SEPP sends the service request message to the corresponding second network SEPP based on the PLMN identifier and the destination identifier.

3. The information sending method according to claim 2 further includes: The second network SEPP sends a service request message to the target NF based on the destination identifier of the target NF.

4. The information transmission method according to claim 1 further includes: When configuring the information of the second network NRF element, the first network NRF element adds a destination identifier to the domain name information of the second network NRF element.

5. The information sending method according to claim 1, further comprising: When a second network NF element registers with a second network NRF element, it carries a destination identifier.

6. An information transmitting device, comprising: The identifier recognition module is configured to, upon receiving a service message, identify the destination identifier carried by the target domain name in the service message, wherein the destination identifier includes at least one of a region identifier and a province identifier, and the destination identifier is located in the fully qualified domain name field; as well as The message transceiver module is configured to send the service message to the second network security edge protection agent (SEPP) corresponding to the destination based on the Public Land Mobile Network (PLMN) identifier and the destination identifier. The service message includes a service discovery message sent by the first network storage function (NRF) element. The message transceiver module is further configured to receive a service discovery response message returned by the second network SEPP, wherein the service discovery response message includes a destination identifier of the target NF, and to send the service discovery response message to the first network function NF element through the first network NRF element.

7. The information transmitting device according to claim 6, wherein, The service message also includes a service request message sent by the first network NF element, wherein the service request message includes the destination identifier of the target NF, wherein... The message sending and receiving module is configured to send the service request message to the corresponding second network SEPP based on the PLMN identifier and the destination identifier.

8. An information transmitting device, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the information transmission method as described in any one of claims 1 to 5 based on instructions stored in the memory.

9. An information transmission system, comprising: The information transmitting device according to any one of claims 6 to 8; The second network, SEPP, is configured to receive service messages sent by the information sending device.

10. The information transmission system according to claim 9, further comprising: A second network NRF element is configured to receive a registration request from a second network NF element, the registration request including a destination identifier, and to return a service discovery response message to the second network SEPP, wherein the service discovery response message includes the destination identifier of the target NF; and The first network NRF element is configured to add a destination identifier to the domain name information of the second network NRF element when configuring the information of the second network NRF element.

11. A non-transitory computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the information transmission method as described in any one of claims 1 to 5.

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