Method, device and terminal for accessing a network

Abstract

The application provides a method, device and terminal for accessing a network. The method for accessing a network comprises: when a terminal finds that multiple independent standalone non-public networks (SNPNs) are available for selection, obtaining an SNPN list, wherein the SNPN list comprises access identifiers of at least two SNPN networks; selecting a target network from the at least two SNPN networks according to the access identifiers of the SNPN networks, and accessing the target SNPN network. The scheme of the application can improve the network selection efficiency of the terminal for the SNPNs providing short message services, reduce a large amount of invalid signaling interaction, and reduce network overhead.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, in particular to a method and device for accessing a network and a terminal. BACKGROUND

[0002] In the prior art, a short message service function (SMSF) discovery mechanism is discovered by a standalone networked non-public network (SNPN) mode. The SNPN is a 5G network completely independent of an operator network and provides private network resources for customers.

[0003] Currently, when an SNPN terminal selects a network to access, only the network identifier (Net ID, NID) of the network to access is used as a reference. When there are multiple SNPN networks available for the terminal to select, if the SNPN networks have different services, for example, some SNPN networks can provide short message services and some SNPN networks do not provide short message services, the terminal cannot select a suitable SNPN network according to its service capability. The terminal can only discover whether the SNPN network supports the short message service after registering to the SNPN network. If the SNPN network does not support the short message service at this time, but the terminal needs to use the short message service, the terminal needs to select other SNPN networks. In this scenario, the terminal needs to select SNPN multiple times until a suitable SNPN network is selected. This inevitably leads to low terminal network selection efficiency and a large amount of invalid signaling interaction. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a method and device for accessing a network and a terminal, which solves the problem that the terminal cannot select a suitable SNPN network according to its service capability in the prior art, leading to low terminal network selection efficiency and a large amount of invalid signaling interaction.

[0005] To solve the above technical problems, the technical solutions of the present application are as follows:

[0006] A method for accessing a network, applied to a terminal, the method comprising:

[0007] When the terminal discovers that there are multiple standalone networked non-public networks (SNPNs) available for selection, an SNPN list is obtained, the SNPN list comprising access identifiers of at least two SNPN networks;

[0008] According to the access identifiers of the SNPN networks, a target network is selected from the at least two SNPN networks, and the target SNPN network is accessed.

[0009] Optionally, the access identifiers of the SNPN networks comprise priorities of the SNPN networks that the terminal can access.

[0010] Optionally, the priority is determined by at least one of the following:

[0011] The distance between the terminal and the SNPN network accessible by the terminal;

[0012] The signal strength of the SNPN network accessible by the terminal.

[0013] Optionally, the access identifier of the SNPN network comprises a rejection identifier for rejecting the terminal access.

[0014] Optionally, the rejection identifier for rejecting the terminal access comprises at least one of the following:

[0015] An identifier composed of a public land mobile network (PLMN) and a network identifier (NID);

[0016] A specified preset identifier.

[0017] Optionally, the method for accessing a network further comprises:

[0018] The terminal sends a registration request message to an SNPN access and mobility function (AMF), wherein the registration request message carries an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages;

[0019] Receiving a first response message fed back by the SNPN AMF in response to the registration request message;

[0020] If the first response message is a rejection reason message disallowing the terminal to access the SNPN network, adding a rejection identifier for disallowing the terminal to access the SNPN network in the SNPN list.

[0021] Optionally, the method for accessing a network further comprises:

[0022] The terminal sends a registration request message to an SNPN access and mobility function (AMF), wherein the registration request message carries an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages;

[0023] Receiving a second response message fed back by the SNPN AMF in response to the registration request message;

[0024] If the second response message is a response message allowing the terminal to access the SNPN network and the SNPN list contains a network identifier of the SNPN network accessible by the terminal, keeping the SNPN list unchanged.

[0025] Optionally, the access identifier of the SNPN network comprises a priority of the SNPN network accessible by the terminal, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, comprising: the target network is selected from the at least two SNPN networks according to the priority of the SNPN network accessible by the terminal, and the target SNPN network is accessed; or,

[0026] The access identifier of the SNPN network comprises a rejection identifier of the terminal being rejected to access, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, comprising: the target network without the rejection identifier is selected from the at least two SNPN networks according to the rejection identifier of the terminal being rejected to access, and the target SNPN network is accessed; or,

[0027] The access identifier of the SNPN network comprises a priority of the SNPN network accessible by the terminal and a rejection identifier of the terminal being rejected to access, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, comprising: the target SNPN network is accessed from at least one SNPN network without the rejection identifier in the SNPN list according to the priority of the at least one SNPN network.

[0028] Embodiments of the present application also provide a device for accessing a network, applied to a terminal, the device comprising:

[0029] The acquisition module is configured to acquire an SNPN list when the terminal discovers that multiple standalone networked non-public networks (SNPNs) are available, the SNPN list comprising access identifiers of at least two SNPN networks;

[0030] The processing module is configured to select a target network from the at least two SNPN networks according to the access identifiers of the SNPN networks, and access the target SNPN network.

[0031] Embodiments of the present application also provide a terminal, comprising: a processor, a memory storing a computer program, and the computer program is executed by the processor to perform the method as described above.

[0032] Embodiments of the present application also provide a computer readable storage medium storing instructions, when the instructions are executed on a computer, the computer executes the method as described above.

[0033] The above-mentioned scheme of the present application at least has the following beneficial effects:

[0034] The method for accessing a network provided by the application, comprising: obtaining a standalone network non-public network (SNPN) list, the SNPN list comprising access identifiers of at least one SNPN network; and accessing a target SNPN network according to the access identifiers of the SNPN network. This can effectively improve the efficiency of selecting an SNPN network that provides short message services, reduce a large amount of invalid signaling interaction, and reduce network overhead. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a method flow diagram of the application embodiment for accessing a network;

[0036] Figure 2 is a specific flow diagram of the application embodiment for accessing a network;

[0037] Figure 3 is a structural diagram of the application embodiment for accessing a network. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be accurately conveyed to those skilled in the art.

[0039] As Figure 1 shown, the application embodiment provides a method for accessing a network, comprising:

[0040] Step 11: When the terminal finds that there are multiple standalone network non-public networks (SNPNs) available for selection, an SNPN list is obtained, the SNPN list comprising access identifiers of at least two SNPN networks. Here, the terminal locally maintains an SNPN list, which records the access identifiers of the SNPN networks, so that the terminal can access the corresponding SNPN network according to the access identifier when accessing the SNPN network;

[0041] Step 12: According to the access identifiers of the SNPN network, a target network is selected from the at least two SNPN networks, and the target SNPN network is accessed. Here, the terminal can identify the SNPN network in the SNPN list according to the access identifier, and accurately access the corresponding target SNPN network, thereby improving the efficiency of the terminal accessing the SNPN network.

[0042] The embodiment of the present application enables the terminal to accurately access the target SNPN network through the access identifier of the SNPN network, thereby effectively improving the network selection efficiency of the terminal for the SNPN providing the short message service, reducing a large amount of invalid signaling interaction, and reducing network overhead.

[0043] In an optional embodiment of the present application, the access identifier of the SNPN network in step 11 comprises: the priority of the SNPN network that the terminal can access and / or the rejection identifier for rejecting the terminal access.

[0044] Here, when the terminal finds that there are multiple SNPN networks to choose from, in addition to the network selection process, the SNPN list stored in the terminal needs to be checked, and then one of the target SNPN networks is selected for access.

[0045] The SNPN list carries the priority of all SNPN networks that the terminal can access, and the SNPN list carries the SNPN identifier of the SNPN that does not support the short message service and that the terminal has been rejected before, for example, the SNPN identifier formed by the public land mobile network (PLMN) + network identifier (NID).

[0046] In an optional embodiment of the present application, the priority is determined by at least one of the following: the distance between the terminal and the SNPN network that the terminal can access; and the signal strength of the SNPN network that the terminal can access. However, the priority of the SNPN network can also be determined by other information.

[0047] The rejection identifier for rejecting the terminal access comprises at least one of the following: an identifier composed of the public land mobile network (PLMN) and the wireless network identifier (NID); and a specified preset identifier.

[0048] In an optional embodiment of the present application, the method for accessing the network can further comprise: the terminal sends a registration request message to the SNPN access and mobility management function (AMF), and the registration request message carries an identifier for indicating that the terminal supports sending / receiving the non-access stratum (NAS) short message.

[0049] The first response message fed back by the SNPN AMF for the registration request message is received.

[0050] If the first response message is a rejection reason message for not allowing the terminal to access the SNPN network, a rejection identifier for not allowing the terminal to access the SNPN network is added in the SNPN list.

[0051] Here, when the SNPN AMF receives the terminal registration request message, the terminal's supported capabilities can be obtained through a standard process. Here, the registration request message carries an "SMS supported" identifier, indicating that it supports sending / receiving NAS short messages. The SNPN AMF determines whether to allow the terminal to access based on the terminal capabilities, whether the terminal is subscribed to a short message service, and whether the network supports a short message service.

[0052] In another optional embodiment of the application, the method of accessing a network can further include:

[0053] The terminal sends a registration request message to an SNPN mobile management function AMF, and the registration request message carries an identifier indicating that the terminal supports sending / receiving NAS short messages.

[0054] Receiving a second response message fed back by the SNPN AMF for the registration request message;

[0055] If the second response message is a response message allowing the terminal to access the SNPN network and the SNPN list contains the network identifier of the SNPN network accessed by the terminal, the SNPN list remains unchanged. The SNPN AMF selects an SMSF access for the terminal and provides a short message service.

[0056] As shown in Figure 2 , in a specific implementation process, the method includes:

[0057] 1. The terminal sends a registration request to an authentication management function (AMF);

[0058] 2. The AMF obtains terminal short message service subscription information and SMSF information, and interacts with the SMSF and a unified data management (UDM), and a new AMF replaces an old AMF;

[0059] 3. The terminal updates the SNPN list according to the feedback of the AMF; specifically, if the registration fails, the process ends; if the registration is successful, the subsequent process continues;

[0060] 4. SMSF selection;

[0061] 5. New AMF selects PCF;

[0062] 6. Network SMSF short message service activation request (Nsmsf_SMService_Activate_Request);

[0063] 7. Unified Data Management (UDM) Discovery;

[0064] 8a. Network UDM Registration (Nudm_UECM_Registration);

[0065] 8b. Network UDM Get Nudm_SDM_Get;

[0066] 9. Network SMSF Short Message Service Activation Response (Nsmsf_SMService_Activate Response);

[0067] 10. Registration Accept;

[0068] In an optional embodiment of the present application, the above step 12 can include:

[0069] The access identifier of the SNPN network includes a priority of the SNPN network that the terminal can access, the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: the target network is selected from the at least two SNPN networks in the order of the priority of the SNPN network that the terminal can access, and the target SNPN network is accessed; in an implementable example, 8 SNPN networks are included in the SNPN list, the priorities are arranged in descending order, and the terminal preferentially selects the SNPN network with the highest priority to access; or

[0070] The access identifier of the SNPN network includes a rejection identifier of the terminal access rejection, the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: the target network without the rejection identifier is selected from the at least two SNPN networks according to the rejection identifier of the terminal access rejection, and the target SNPN network is accessed; in an implementable example, 8 SNPN networks are included in the SNPN list, the networks with the rejection identifier are filtered out, and a target SNPN network is selected from the networks without the rejection identifier for access; or

[0071] In step 123, the access identifier of the SNPN network includes a priority of the SNPN network that the terminal can access and a rejection identifier for rejecting the terminal to access, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: according to the at least one SNPN network in the SNPN list without the rejection identifier, the target SNPN network is accessed in the order of the priority of the at least one SNPN network; in an implementable example, the SNPN list includes eight SNPN networks, the priorities are arranged in descending order, three SNPN networks have the rejection identifier, and the terminal selects the SNPN network with the highest priority from the remaining five SNPN networks according to the priority order.

[0072] The above embodiments of the present application can improve the network selection efficiency of the terminal for the SNPN providing the short message service, reduce a large amount of invalid signaling interaction, and reduce network overhead by the terminal maintaining the SNPN list.

[0073] As shown in Figure 3 The embodiments of the present application also provide a device 30 for accessing a network, the device 30 includes:

[0074] An acquisition module 31 is configured to acquire an SNPN list when the terminal finds that multiple independent networked SNPNs are available for selection, the SNPN list including access identifiers of at least two SNPN networks;

[0075] A processing module 32 is configured to select a target network from the at least two SNPN networks according to the access identifier of the SNPN network, and access the target SNPN network.

[0076] Optionally, the access identifier of the SNPN network includes a priority of the SNPN network that the terminal can access.

[0077] Optionally, the priority is determined by at least one of the following:

[0078] The distance between the terminal and the SNPN network that the terminal can access;

[0079] The signal strength of the SNPN network that the terminal can access.

[0080] Optionally, the access identifier of the SNPN network includes a rejection identifier for rejecting the terminal to access.

[0081] Optionally, the rejection identifier for rejecting the terminal to access includes at least one of the following:

[0082] An identifier composed of a public land mobile network (PLMN) and a network identifier (NID);

[0083] The specified preset identifier.

[0084] Optionally, the processing module 32 is further configured to send a registration request message to an SNPN AMF, the registration request message carrying an identifier indicating that the terminal supports sending / receiving a non-access stratum (NAS) short message.

[0085] receive a first response message fed back by the SNPN AMF for the registration request message;

[0086] If the first response message is a rejection reason message indicating that the terminal is not allowed to access the SNPN network, a rejection identifier indicating that the terminal is not allowed to access the SNPN network is added in the SNPN list.

[0087] Optionally, the processing module 32 is further configured to send a registration request message to an SNPN AMF, the registration request message carrying an identifier indicating that the terminal supports sending / receiving a non-access stratum (NAS) short message.

[0088] receive a second response message fed back by the SNPN AMF for the registration request message;

[0089] If the second response message is a response message indicating that the terminal is allowed to access the SNPN network and the SNPN list contains a network identifier of an SNPN network accessed by the terminal, the SNPN list remains unchanged.

[0090] Optionally, the access identifier of the SNPN network includes a priority of an SNPN network that the terminal can access, and the target network is selected from at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: the target network is selected from at least two SNPN networks according to the priority of the SNPN network that the terminal can access, and the target SNPN network is accessed; or,

[0091] The access identifier of the SNPN network includes a rejection identifier indicating that the terminal is rejected to access, and the target network is selected from at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: the target network without the rejection identifier is selected from at least two SNPN networks according to the rejection identifier indicating that the terminal is rejected to access, and the target SNPN network is accessed; or,

[0092] The access identifier of the SNPN network includes a priority of the SNPN network that the terminal can access and a rejection identifier for rejecting the terminal to access, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: according to at least one SNPN network in the SNPN list without the rejection identifier, the target SNPN network is accessed in the order of the priority of the at least one SNPN network.

[0093] It should be noted that the device corresponds to the above method, and all implementation manners in the above method embodiments are applicable to the embodiments of the device and can achieve the same technical effects.

[0094] Embodiments of the application also provide a terminal, comprising: a processor, a memory storing a computer program, when the computer program is executed by the processor, the method as claimed in the above is executed. All implementation manners in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0095] Embodiments of the application also provide a computer readable storage medium, storing instructions, when the instructions are executed on a computer, the computer executes the method as claimed in the above. All implementation manners in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0096] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0097] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above described system, device and unit can refer to the corresponding process in the above method embodiments, which will not be repeated here.

[0098] In the embodiments of the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the embodiments of the apparatus described above are merely schematic, and the division of the units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0099] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0100] In addition, each functional unit in the various embodiments of the present application can be integrated in one processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit.

[0101] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, and various other media that can store program codes.

[0102] Moreover, it is pointed out that in the device and method of the present application, obviously, the components or steps can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application. Also, the steps of performing the above series of processes can naturally be executed in time sequence according to the order of description, but do not need to be necessarily executed in time sequence, and some steps can be executed in parallel or independently of each other. It can be understood by those skilled in the art that all or any steps or components of the method and device of the present application can be implemented in hardware, firmware, software or a combination thereof in any computing device (including a processor, a storage medium, etc.) or a network of computing devices, using the basic programming skills of those skilled in the art upon reading the description of the present application.

[0103] Therefore, the object of the present application can also be achieved by running a program or a set of programs on any computing device. The computing device can be a commonly known general-purpose device. Therefore, the object of the present application can also be achieved only by providing a program product containing program code for implementing the method or device. That is, such a program product also constitutes the present application, and a storage medium storing such a program product also constitutes the present application. Obviously, the storage medium can be any commonly known storage medium or any storage medium developed in the future. It is also pointed out that in the device and method of the present application, obviously, the components or steps can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application. Also, the steps of performing the above series of processes can naturally be executed in time sequence according to the order of description, but do not need to be necessarily executed in time sequence. Some steps can be executed in parallel or independently of each other.

[0104] The above is the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of accessing a network, characterized by, The method applied to a terminal comprises: When the terminal finds that multiple standalone non-public networks (SNPNs) are available, obtaining an SNPN list comprising access identifiers of at least two SNPN networks; According to the access identifiers of the SNPN networks, selecting a target network from the at least two SNPN networks and accessing the target SNPN network; The method further comprises: The terminal sends a registration request message to an SNPN access and mobility function (AMF), wherein the registration request message carries an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages; Receiving a first response message fed back by the SNPN AMF in response to the registration request message; If the first response message is a rejection reason message indicating that the terminal is not allowed to access the SNPN network, adding a rejection identifier indicating that the terminal is not allowed to access the SNPN network in the SNPN list; or The method further comprises: The terminal sends a registration request message to an SNPN access and mobility function (AMF), wherein the registration request message carries an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages; Receiving a second response message fed back by the SNPN AMF in response to the registration request message; If the second response message is a response message indicating that the terminal is allowed to access the SNPN network and the SNPN list contains a network identifier of an SNPN network accessed by the terminal, keeping the SNPN list unchanged. The access identifiers of the SNPN networks comprise rejection identifiers indicating that the terminal is not allowed to access the SNPN networks; the rejection identifiers indicating that the terminal is not allowed to access the SNPN networks comprise identifiers composed of public land mobile networks (PLMNs) and network identifiers (NIDs); and the SNPN list contains SNPN identifiers that do not support short message services and that have been rejected by the terminal before.

2. The method of accessing a network of claim 1, wherein, The access identifiers of the SNPN networks comprise priorities of the SNPN networks that the terminal can access.

3. The method of accessing a network of claim 2, wherein, The priorities are determined according to at least one of the following: Distances between the terminal and the SNPN networks that the terminal can access; Signal strengths of the SNPN networks that the terminal can access.

4. The method for accessing a network according to claim 1, wherein The access identifiers of the SNPN networks comprise priorities of the SNPN networks that the terminal can access; and according to the access identifiers of the SNPN networks, selecting a target network from the at least two SNPN networks and accessing the target SNPN network comprises: selecting a target network from the at least two SNPN networks and accessing the target SNPN network in the order of the priorities of the SNPN networks that the terminal can access; or The access identifiers of the SNPN networks comprise rejection identifiers indicating that the terminal is not allowed to access the SNPN networks; and according to the access identifiers of the SNPN networks, selecting a target network from the at least two SNPN networks and accessing the target SNPN network comprises: selecting a target network from the at least two SNPN networks that do not have rejection identifiers and accessing the target SNPN network according to the rejection identifiers indicating that the terminal is not allowed to access the SNPN networks; or The access identifier of the SNPN network includes a priority of the SNPN network that the terminal can access and a rejection identifier for rejecting the terminal to access, and the target network is selected from the at least two SNPN networks according to the access identifier of the SNPN network, and the target SNPN network is accessed, including: according to at least one SNPN network in the SNPN list without the rejection identifier, the target SNPN network is accessed in the order of the priority of the at least one SNPN network.

5. An apparatus for accessing a network, the apparatus comprising: The device applied to the terminal comprises: The acquisition module is configured to acquire an SNPN list when the terminal discovers that multiple standalone networked non-public networks (SNPNs) are available for selection, the SNPN list including access identifiers of at least two SNPN networks; The processing module is configured to select a target network from the at least two SNPN networks according to the access identifiers of the SNPN networks and access the target SNPN network. The processing module is further configured to send a registration request message to an SNPN access and mobility function (AMF), the registration request message carrying an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages; A first response message fed back by the SNPN AMF is received in response to the registration request message; If the first response message is a rejection reason message disallowing the terminal to access the SNPN network, a rejection identifier disallowing the terminal to access the SNPN network is added in the SNPN list; or The processing module is further configured to send a registration request message to an SNPN access and mobility function (AMF), the registration request message carrying an identifier indicating that the terminal supports sending / receiving non-access stratum (NAS) short messages; A second response message fed back by the SNPN AMF is received in response to the registration request message; If the second response message is a response message allowing the terminal to access the SNPN network and the SNPN list contains a network identifier of the SNPN network that the terminal accesses, the SNPN list remains unchanged. The access identifier of the SNPN network includes a rejection identifier for rejecting the terminal to access; the rejection identifier for rejecting the terminal to access includes an identifier composed of a public land mobile network (PLMN) and a wireless network identifier (NID); and the SNPN list contains an SNPN identifier that does not support short message services and that the terminal has been rejected before.

6. A terminal, characterized by comprising: The device comprises: A processor and a memory storing a computer program, the computer program being executed by the processor to perform the method of any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The instructions, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 4.

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