A 5G session establishment processing method, device, server, system and medium

Abstract

The application provides a 5G session establishment processing method, device, server, system and medium. The method comprises: an AMF acquires a PDU session establishment request initiated by a 5G terminal, and identifies whether a DNN and a network slice are carried in the PDU session establishment request; if the AMF identifies that the DNN is carried in the PDU session establishment request, the AMF confirms whether a network slice matched with the DNN can be acquired according to terminal identification corresponding to UDM subscription information in the PDU session establishment request; if the AMF confirms that the network slice matched with the DNN cannot be acquired, the AMF selects a default slice with the smallest serial number from default slices in the UDM subscription information as a most preferred slice, and performs session establishment processing according to the most preferred slice and a default DNN in a plurality of DNNs corresponding to the most preferred slice. The application solves the session establishment failure in the prior art, reduces the consumption of network resources, and improves user experience.

Description

Technical Field

[0001] This application relates to communication technology, and more particularly to a 5G session establishment processing method, device, server, system, and medium. Background Technology

[0002] Currently, 5G (5th Generation Mobile Communication Technology) has been commercially available for over three years, with network construction proceeding rapidly and smart applications emerging daily. As of the end of September 2022, my country had a total of 2.22 million 5G base stations and 510 million 5G mobile users. 5G is playing a vital role in various industries, including manufacturing, healthcare, education, and transportation, covering 40 of the 97 major categories of the national economy. With the development of 5G, to further stimulate new models in vertical industries and enhance the segmentation capabilities of the mass network, existing technologies have added 5G network slicing functionality to the 5G network architecture to provide more complete, isolated, differentiated, efficient, and user-friendly network capabilities.

[0003] Specifically, under the existing 5G network architecture, after a 5G terminal successfully registers, when establishing a session, due to limitations in the performance of the 5G terminal, such as limitations in the operating system, baseband chip, and application functions, it can generally only carry the Data Network Name (DNN) and cannot report the slice. As a result, the Access and Mobility Management Function (AMF) can only select the slice from the data based on the matching Session Management Function (SMF), which leads to the inability to successfully match the slice, and thus the session establishment fails.

[0004] Therefore, there is an urgent need for a way to effectively improve the establishment of sessions on 5G terminals. Summary of the Invention

[0005] This application provides a 5G session establishment processing method, device, server, system, and medium to address the problem of how to improve session success rate.

[0006] In a first aspect, this application provides a 5G session establishment processing method, including:

[0007] The Access and Mobility Management Function (AMF) acquires Protocol Data Unit (PDU) session establishment requests initiated by 5G terminals and identifies whether the PDU session establishment request carries DNN and network slices.

[0008] If AMF detects that a DNN is carried in the PDU session establishment request, it will determine whether a network slice matching the DNN can be obtained based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request.

[0009] If AMF confirms that it cannot obtain a network slice that matches the DNN, it selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0010] In one possible implementation, if the AMF detects that a network slice is carried in the PDU session establishment request, it determines whether to obtain the DNN corresponding to the network slice based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request.

[0011] If AMF confirms that it has not obtained a DNN corresponding to the network slice, it selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0012] In one possible implementation, if the AMF recognizes that the PDU session establishment request carries network slices and DNN, it obtains the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request.

[0013] If AMF determines that network slices and DNNs exist in the UDM subscription information, it confirms that the PDU session establishment request is a legitimate request and performs session establishment processing based on the network slices and DNNs.

[0014] In one possible implementation, if the AMF determines that there is no network slice and DNN in the UDM subscription information, it confirms that the PDU session establishment request is an invalid request, selects the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0015] In one possible implementation, if the AMF detects that the PDU session establishment request does not carry a network slice and a DNN, it selects the default slice with the smallest sequence number from the default slices in the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0016] Secondly, this application provides a session establishment processing apparatus, comprising:

[0017] The acquisition module is used to acquire Protocol Data Unit (PDU) session establishment requests initiated by 5G terminals.

[0018] The processing module is also used to identify whether the PDU session establishment request carries a DNN and network slices.

[0019] The processing module is also used to determine whether a network slice matching the DNN can be obtained based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request if a DNN is detected in the PDU session establishment request.

[0020] The processing module is also used to select the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice if it is confirmed that a network slice matching the DNN cannot be obtained, and to perform session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0021] The processing module is further configured to, if it is detected that the PDU session establishment request carries a network slice, determine whether to obtain the DNN corresponding to the network slice identifier based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request.

[0022] The processing module is further configured to, if it is confirmed that no DNN corresponding to the network slice has been obtained, select the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice, and perform session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0023] Thirdly, a server includes a memory and a processor; wherein,

[0024] The memory is used to store computer programs.

[0025] The processor is configured to read the computer program stored in the memory and execute the session establishment processing method described in the first aspect according to the computer program in the memory.

[0026] Fourthly, a communication system includes a 5G terminal, an AMF, and a UDM; wherein the AMF is used to perform the session establishment processing method described in the first aspect.

[0027] Fifthly, a computer-readable storage medium storing computer-executable instructions, wherein when a processor executes the computer-executable instructions, the session establishment processing method described in the first aspect is implemented.

[0028] This application provides a 5G session establishment processing method, device, server, system, and medium. The AMF obtains a Protocol Data Unit (PDU) session establishment request initiated by a 5G terminal and identifies whether the PDU session establishment request carries a Data Name Node (DNN) and a network slice. If the PDU session establishment request carries a DNN, it determines whether a network slice matching the DNN can be obtained based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request. If it is determined that a network slice matching the DNN cannot be obtained, the default slice with the smallest sequence number is selected from the default slices in the UDM subscription information as the highest priority slice, and session establishment processing is performed based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. Compared to existing technologies that fail to obtain matching slices when only a DNN is carried, leading to session establishment failure, this application can select the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice. Based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice, the session establishment is successfully achieved. Therefore, this application effectively improves the success rate of terminal session establishment, reduces network resource consumption, and enhances user experience. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating a 5G session establishment process provided in this embodiment;

[0031] Figure 2 This is a schematic diagram of another 5G session establishment process provided in this embodiment;

[0032] Figure 3 This is a schematic diagram of a 5G session establishment processing device provided in this embodiment;

[0033] Figure 4 This is a structural diagram of a 5G session establishment and processing communication system provided in this embodiment. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] First, let me explain the terms used in this application:

[0036] Default slice: This refers to the fact that, according to the operator's policy, one or more UDM subscription slices may be set as the default slice. If the UE does not carry slice information in the registration request message, the network will use the default S-NSSAI to provide services to the terminal.

[0037] Non-default slices: These are slices other than the default slices in a user's UDM contract.

[0038] Network slicing: Network slicing is a key feature of 5G networks, enabling the construction of dedicated logical networks on shared infrastructure. 5G network slicing represents a network architecture that allows independent and virtualized logical networks to reuse the same physical network infrastructure. Each slice is an independent end-to-end network designed to meet the diverse needs of specific applications.

[0039] Access and Mobility Management Function (AMF): This is a very important network function in 5G. It directly manages 5G radio access requests and performs functions such as registration management, connection management, reachability management, and mobility management.

[0040] User Plane Function (UPF) is one of the important network functions in 5G. It includes packet routing and forwarding, packet inspection, and enforcement of user plane policies and rules.

[0041] Session Management Function (SMF): Session management, such as session establishment, modification and release, including channel maintenance between UPF and AN nodes, UE IP address allocation and management, etc.

[0042] Data Network Name (DNN): Its main function is to distinguish access from different data networks. Based on the DNN, sessions are routed and aggregated to different SMFs / UPFs to enable targeted access for clients.

[0043] Unified Data Management (UDM): By generating 3GPPAKA authentication credentials and storing and managing SUPI, it identifies and verifies the legitimacy of users.

[0044] Protocol Data Unit (PDU): In a layered network architecture, each layer of the transport system establishes a PDU. A PDU contains information from the upper layer and additional information about the entity in the current layer. This PDU is then transmitted to the next lower layer. The physical layer actually transmits these PDUs as a framed bit stream, which are constructed by higher layers of the protocol stack. The receiving system transmits these packets from bottom to top through the protocol stack, extracting relevant information from the PDU at each layer of the stack.

[0045] In existing technologies, when a 5G terminal establishes a session, due to limitations in the performance of the 5G terminal, such as the limitations of the operating system, baseband chip, and application functions, it can generally only send a session establishment request carrying a DNN to the base station, which then sends it to the AMF. Since it cannot report slices, the AMF can only select slices from the data based on the SMF, which leads to the inability to successfully match slices and thus causes the session establishment to fail.

[0046] Based on this, in order to solve the above-mentioned technical problems, the technical concept of this application lies in how to effectively improve the success rate of 5G terminal session establishment when 5G terminals are restricted.

[0047] The following is a detailed description of a 5G session establishment scheme of this application.

[0048] Figure 1 This is a flowchart illustrating a 5G session establishment process provided in this embodiment. Figure 1 As shown, the execution entity of this method is AMF. Specifically, this method includes:

[0049] S101, AMF obtains the PDU session establishment request initiated by the terminal.

[0050] S102, AMF recognizes that the PDU session establishment request carries a DNN.

[0051] S103, AMF determines whether it can obtain a network slice that matches the DNN based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request.

[0052] In this embodiment, before initiating a PDU session establishment request, the 5G terminal typically performs a registration operation. Specifically, the 5G terminal sends a registration request carrying its terminal identifier to the AMF. The AMF processes the registration based on this request and, upon successful registration, allocates multiple default slices to the terminal identifier. Each default slice corresponds to multiple DNNs. Then, the multiple default slices allocated to the terminal identifier and the multiple DNNs corresponding to each default slice are stored in the UDM (User Dedicated Store) as UDM subscription information; each default slice has a unique sequence number. Furthermore, a default slice and a default DNN under that default slice are selected from the UDM subscription information and sent to the 5G terminal. The 5G terminal, based on its own performance, sends a session establishment request carrying the selected network slice (the default slice) and / or the selected DNN (the default DNN under the default slice) to the AMF to request session establishment.

[0053] Therefore, when the AMF receives the session establishment request, it can query the UDM to obtain the UDM subscription information corresponding to the terminal identifier, based on the terminal identifier, in order to confirm whether it can obtain the network slice that matches the DNN.

[0054] In addition, optionally, the UDM subscription information may include, in addition to the default slice and DNN mentioned above, session information, subscription QoS, and uplink and downlink bandwidth, etc.

[0055] S104. If the AMF confirms that a network slice matching the DNN can be obtained, then a session is established between the AMF and the DNN using that network slice. End.

[0056] S105. If the AMF cannot obtain a network slice that matches the DNN, it selects the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. End.

[0057] In this embodiment, if the AMF cannot obtain a network slice that matches the DNN, it selects the default slice with the smallest sequence number from the multiple allocated default slices in the UDM subscription information corresponding to the terminal identifier stored in the UDM during registration, based on the sequence number corresponding to the default slice, and establishes session processing based on the default DNN among the multiple DNNs corresponding to the default DNN.

[0058] In this embodiment, the AMF acquires a Protocol Data Unit (PDU) session establishment request initiated by a 5G terminal and identifies whether the PDU session establishment request carries a Data Name Node (DNN) and a network slice. If a DNN is identified in the PDU session establishment request, the AMF determines whether a network slice matching the DNN can be obtained based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request. If it is determined that a network slice matching the DNN cannot be obtained, the default slice with the smallest sequence number in the default slices in the UDM subscription information is selected as the highest priority slice, and session establishment is performed based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. Compared with the prior art, which fails to obtain a matching slice when only a DNN is carried, directly leading to session establishment failure, this application can select the default slice with the smallest sequence number in the default slices in the UDM subscription information as the highest priority slice, and achieve successful session establishment based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. Therefore, this application effectively improves the success rate of terminal session establishment, reduces network resource consumption, and enhances user experience.

[0059] Figure 2 This is a schematic diagram of another 5G session establishment process provided in this embodiment. Figure 2 As shown, the method includes:

[0060] S201. The AMF receives the PDU session request and identifies whether the terminal carries a network slice and a DNN. If the terminal only carries a DNN, proceed to step S203; if the terminal only carries a network slice, proceed to step S207; if the terminal does not carry either a network slice or a DNN, proceed to step S211; if the terminal carries both a network slice and a DNN, proceed to step S212.

[0061] In this embodiment, due to the limitations of its own performance, the 5G terminal may carry a DNN and / or network slice when sending a PDU session request, or it may not be able to carry either.

[0062] S203. The AMF, based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request, confirms whether a network slice matching the DNN can be obtained; if it is confirmed that a network slice matching the DNN can be obtained, then S204 is executed. If it is confirmed that a network slice matching the DNN cannot be obtained, then S205 is executed.

[0063] S204, AMF establishes a session with the DNN and its matching network slices. End.

[0064] S205. AMF selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. End.

[0065] S207. The AMF, based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request, confirms whether a DNN matching the slice can be obtained. If it is confirmed that a DNN matching the network slice can be obtained, then proceed to S208. If it is not confirmed that a DNN matching the slice can be obtained, then proceed to S209.

[0066] S208, AMF establishes a session using this network slice and its matching DNN. End.

[0067] S209. AMF selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. End.

[0068] S211. AMF selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. End.

[0069] S212. AMF determines whether the network slice and DNN are valid from the UDM signing information. If valid, proceed to step S213; if invalid, proceed to step S214.

[0070] S213. The AMF confirms that the PDU session establishment request is a legitimate request and processes the session establishment based on the network slice and DNN. End.

[0071] S214. AMF selects the default slice with the smallest sequence number from the default slices in the UDM contract information as the highest priority slice, and performs session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice. End.

[0072] In this embodiment, due to the inherent performance limitations of the 5G terminal, various scenarios arise when establishing a session request, such as: a scenario carrying only a DNN, a scenario carrying only a network slice, a scenario without a network slice and DNN, and a scenario carrying a network slice and DNN but potentially invalid. However, regardless of the scenario, the improved session information matching rules of this application can obtain a suitable network slice and DNN to establish a session request, thereby effectively improving the success rate of session establishment. Furthermore, compared to the prior art where session establishment fails due to the lack of a matching slice, leading to repeated session establishment requests and consuming significant network resources, this application effectively reduces network resource consumption and significantly improves network performance.

[0073] Figure 3 This is a schematic diagram of a 5G session establishment processing device provided in this embodiment. Figure 3 As shown, the device includes: an acquisition module 301 and a processing module 302. Among them,

[0074] The acquisition module 301 is used to acquire the Protocol Data Unit (PDU) session establishment request initiated by the 5G terminal.

[0075] The processing module 302 is used to identify whether the PDU session establishment request carries a DNN and a network slice; the processing module 302 is also used to, if the PDU session establishment request is found to carry a DNN, determine whether a network slice matching the DNN can be obtained based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request; the processing module 302 is also used to, if it is determined that a network slice matching the DNN cannot be obtained, select the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice, and perform session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0076] Based on the above embodiments, the processing module 302 can also be used to, if it is recognized that the PDU session establishment request carries a network slice, determine whether the DNN corresponding to the network slice has been obtained according to the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request; if it is determined that the DNN corresponding to the network slice has not been obtained, select the default slice with the smallest sequence number from the default slices in the UDM subscription information as the highest priority slice, and perform session establishment processing according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

[0077] The 5G session establishment processing device provided in this application embodiment can execute the technical solution shown in the above method embodiment. Its implementation principle and beneficial effects are similar, and will not be described again here.

[0078] This embodiment also provides a server, which includes a memory and a processor. The memory is used to store computer programs; the processor is used to read the computer programs stored in the memory and execute the method embodiment shown above according to the computer programs in the memory, which will not be described again here.

[0079] Figure 4 This embodiment provides a structural diagram of a 5G session establishment and processing communication system. Figure 4 As shown. The system includes: a 5G terminal 401, an AMF 402, and a UDM 403, wherein the AMF 402 is used to perform the embodiment of the method described above, which will not be described again here.

[0080] This embodiment also provides a computer-readable storage medium storing computer-executable instructions. When the processor executes the computer-executable instructions, it implements the embodiment of the method described above, which will not be repeated here.

[0081] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A session establishment processing method, characterized in that, include: The Access and Mobility Management Function (AMF) acquires Protocol Data Unit (PDU) session establishment requests initiated by 5G terminals and identifies whether the PDU session establishment request carries a Data Network Name (DNN) and a network slice. If the AMF identifies that the PDU session establishment request carries a DNN but not a network slice, it determines whether a network slice matching the DNN can be obtained based on the Unified Data Management (UDM) subscription information corresponding to the terminal identifier in the PDU session establishment request. If the AMF confirms that it cannot obtain a network slice that matches the DNN, it selects the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information as the highest priority slice. Each default network slice has a unique sequence number, and PDU session establishment processing is performed according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

2. The session establishment processing method according to claim 1, characterized in that, Also includes: If the AMF detects that the PDU session establishment request carries a network slice, it determines whether to obtain the DNN corresponding to the network slice based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request. If the AMF confirms that no DNN corresponding to the network slice has been obtained, it selects the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information as the highest priority slice. Each default network slice has a unique sequence number, and PDU session establishment processing is performed according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

3. The session establishment processing method according to claim 1, characterized in that, Also includes: If the AMF recognizes that the PDU session establishment request carries network slices and DNN, it obtains the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request. If the AMF determines that the network slice and DNN exist in the UDM subscription information, it confirms that the PDU session establishment request is a legitimate request and performs PDU session establishment processing based on the network slice and DNN.

4. The session establishment processing method according to claim 3, characterized in that, Also includes: If the AMF determines that the network slice and DNN do not exist in the UDM subscription information, it confirms that the PDU session establishment request is an invalid request, and selects the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information as the highest priority slice. Each default network slice has a unique sequence number, and performs PDU session establishment processing according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

5. The session establishment processing method according to claim 1, characterized in that, Also includes: If the AMF detects that the PDU session establishment request does not carry a network slice and a DNN, it selects the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request as the highest priority slice. Each default network slice has a unique sequence number, and the PDU session establishment process is performed according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

6. A session establishment processing device, characterized in that, include: The acquisition module is used to acquire Protocol Data Unit (PDU) session establishment requests initiated by 5G terminals; The processing module is used to identify whether the PDU session establishment request carries the data network name (DNN) and network slice. The processing module is further configured to, if it is detected that the PDU session establishment request carries a DNN but does not carry a network slice, determine whether a network slice matching the DNN can be obtained based on the Unified Data Management (UDM) subscription information corresponding to the terminal identifier in the PDU session establishment request. The processing module is further configured to, if it is confirmed that a network slice matching the DNN cannot be obtained, select the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information as the highest priority slice, each default network slice having a unique sequence number, and perform PDU session establishment processing based on the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

7. The session establishment processing device according to claim 6, characterized in that: The processing module is further configured to, if it is detected that the PDU session establishment request carries a network slice, determine whether to obtain the DNN corresponding to the network slice based on the UDM subscription information corresponding to the terminal identifier in the PDU session establishment request. The processing module is further configured to, if it is confirmed that no DNN corresponding to the network slice is obtained, select the default network slice with the smallest sequence number from the multiple default network slices configured in the UDM subscription information as the highest priority slice, each default network slice having a unique sequence number, and perform PDU session establishment processing according to the highest priority slice and the default DNN among the multiple DNNs corresponding to the highest priority slice.

8. A server, characterized in that, Includes memory and processor; among which, The memory is used to store computer programs; The processor is configured to read the computer program stored in the memory and execute the method according to any one of claims 1-5 based on the computer program in the memory.

9. A communication system, characterized in that, It includes a 5G terminal, an AMF, and a UDM; wherein the AMF is used to perform the method described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement the method described in any one of claims 1-5.

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