Session creation method, device and AMF

Abstract

The present invention provides a session creation method, device and AMF, the method comprising: before the session is created, obtaining slice information corresponding to the session; selecting a session management function SMF according to the slice information, and sending a first session creation request message to the selected SMF; in an embodiment of the present invention, the AMF obtains the slice information corresponding to the session before the session is created, so that the AMF can select the SMF and create the session according to the correct slice information, avoiding the process of inserting the SMF twice, shortening the switching delay, and improving the user service experience; at the same time, the AMF does not need to configure interoperability dedicated slices, reducing the local data workload.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a session creation method, device and AMF. Background Art

[0002] The current solution for slice interoperability is: when a user switches back to 5G from 4G with a multi-slice session, if there is no need to cross the Session Management Function (SMF) service area, the signaling message sent by the Access and Mobility Management Function (AMF) to the anchor SMF does not need to carry session switching information, and the anchor SMF does not need to determine whether the slice information carried by the AMF is consistent with the session slice information stored in itself; when crossing the SMF service area, AMF supports visiting SMF (V-SMF) or intermediate SMF (I-SMF) reselection based on the topology enhancement technology (Enhancing Topology of SMF and UPF in5G Networks, ETSUN) mechanism, that is, AMF needs to configure the single network slice selection assistance information (Single Network Slice Selection Assistance Information, S-NSSAI) dedicated to interoperability to select V-SMF or I-SMF, and carry interoperability-specific slices in the relevant signaling messages sent to them. AMF also needs to support reselection of AMF and V-SMF or I-SMF according to the slice ID corresponding to the session returned by the anchor SMF.

[0003] The defects of the above slice interoperability solution are:

[0004] If the user roams across provinces, AMF needs to select I-SMF with the S-NSSAI of the interoperable dedicated slice, and send the session creation message to the anchor SMF through I-SMF. When the session message returned by the anchor SMF carries the correct slice S-NSSAI, AMF needs to trigger the reselection of I-SMF because the S-NSSAI of the two are inconsistent, resulting in the need to insert I-SMF twice in the entire switching process. The process is cumbersome and the switching time is long, affecting the end-user's service experience. Moreover, the interoperable dedicated slice S-NSSAI configured by AMF can only serve the scenario of slice interoperability, which has limited effect and requires full network planning and configuration, and the workload of local data is large. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a session creation method, device and AMF to solve the problem that the slice interoperability solution in the prior art may cause the insertion of two I-SMF processes to be cumbersome and require full network planning and configuration.

[0006] In order to solve the above problem, an embodiment of the present invention provides a session creation method, which is performed by an access and mobility management function AMF, including:

[0007] Before creating a session, obtain the slice information corresponding to the session;

[0008] According to the slice information, a session management function SMF is selected, and a first session creation request message is sent to the selected SMF.

[0009] Before a session is created, the slice information corresponding to the session is obtained, including:

[0010] Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information;

[0011] or,

[0012] Before a session is created, the slice information corresponding to the session is obtained from the anchor SMF.

[0013] Before the session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information, including:

[0014] Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user;

[0015] According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session;

[0016] Among them, the first session creation request message includes: slice information corresponding to the session.

[0017] Among them, in the contract information, the mapping relationship between the network identifier signed by the user and the slice information is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

[0018] Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF, including:

[0019] Before the session is created, sending a second session creation request message to the anchor SMF;

[0020] Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session;

[0021] According to the second session creation response message, determine the slice information corresponding to the session.

[0022] Before sending the second session creation request message to the anchor SMF, the method further includes:

[0023] Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF;

[0024] According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

[0025] The embodiment of the present invention further provides a session creation device, which is applied to an access and mobility management function AMF, including:

[0026] The acquisition module is used to obtain the slice information corresponding to the session before the session is created;

[0027] The session creation module is used to select a session management function SMF according to the slice information and send a first session creation request message to the selected SMF.

[0028] The embodiment of the present invention further provides an access and mobility management function AMF, including a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, and the processor is used to perform the following operations:

[0029] Before creating a session, obtain the slice information corresponding to the session;

[0030] According to the slice information, a session management function SMF is selected, and a first session creation request message is sent to the selected SMF.

[0031] The processor is further configured to perform the following operations:

[0032] Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information;

[0033] or,

[0034] Before a session is created, the slice information corresponding to the session is obtained from the anchor SMF.

[0035] The processor is further configured to perform the following operations:

[0036] Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user;

[0037] According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session;

[0038] Among them, the first session creation request message includes: slice information corresponding to the session.

[0039] Among them, in the contract information, the mapping relationship between the network identifier signed by the user and the slice information is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

[0040] The processor is further configured to perform the following operations:

[0041] Before the session is created, sending a second session creation request message to the anchor SMF;

[0042] Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session;

[0043] According to the second session creation response message, determine the slice information corresponding to the session.

[0044] The processor is further configured to perform the following operations:

[0045] Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF;

[0046] According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

[0047] An embodiment of the present invention further provides an AMF, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor implements the session creation method as described above when executing the program.

[0048] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the session creation method described above are implemented.

[0049] The above technical solution of the present invention has at least the following beneficial effects:

[0050] In the session creation method, device and AMF of the embodiment of the present invention, AMF obtains the slice information corresponding to the session before the session is created, so that AMF can select SMF and create the session according to the correct slice information, avoiding the process of inserting SMF twice, shortening the switching delay, and improving the user service experience; at the same time, AMF does not need to configure interoperability dedicated slices, reducing the local data workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A flowchart showing the steps of a method for establishing a session provided by an embodiment of the present invention;

[0052] Figure 2 A schematic diagram showing the structure of a session creation device provided by an embodiment of the present invention;

[0053] Figure 3 A schematic diagram showing the structure of the AMF provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0055] like Figure 1 As shown, an embodiment of the present invention provides a session creation method, which is performed by an access and mobility management function AMF, including:

[0056] Step 101, before a session is created, obtain slice information corresponding to the session;

[0057] Step 102: Select a session management function SMF according to the slice information, and send a first session creation request message to the selected SMF.

[0058] It should be noted that the above-mentioned slice information includes: S-NSSAI of the slice. The SMF selected by AMF is V-SMF or I-SMF, that is, step 102 is: AMF selects a suitable V-SMF or I-SMF according to the obtained slice information and TA (Tracking Area), and sends a first session creation request message to the selected V-SMF or I-SMF.

[0059] In the embodiment of the present invention, before the session is created, AMF obtains the slice information corresponding to the session, so there is no need to plan the S-NSSAI of the interoperable dedicated slices for the entire network, which saves local data configuration, reduces operation and maintenance pressure, and can achieve isolation between slices. And because AMF obtains the slice information corresponding to the session before the session is created, it avoids AMF's secondary insertion into the V / I-SMF process, shortens the switching delay, and improves the user service experience. In the embodiment of the present invention, only AMF needs to add some functions, and there is no need to change other network elements, which has little impact on the existing network.

[0060] In at least one embodiment of the present invention, two solutions are provided for obtaining slice information corresponding to a session before the session is created, namely:

[0061] Solution 1: Before the session is created, AMF obtains the slice information corresponding to the session based on the network identifier corresponding to the session and the user contract information.

[0062] Solution 2: Before the session is created, AMF obtains the slice information corresponding to the session from the anchor SMF.

[0063] For solution 1, before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information, including:

[0064] Before the session is created, AMF obtains the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user;

[0065] According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session;

[0066] Among them, the first session creation request message includes: slice information corresponding to the session.

[0067] As an optional embodiment, AMF obtains the network identifier corresponding to the session from MME (Mobility Management Entity) through a context request message and a context response message, and the network identifier may specifically be: Access Point Name (APN). Optionally, the context response message also includes: Fully Qualified Domain Name (FQDN) of the anchor SMF or PGW-C (Packet data network Gateway-controlplane function, PDN gateway control plane).

[0068] As another optional embodiment, AMF obtains user contract information from the unified data manager (UDM) through the "Nudm_SDM_Get message", where the network identifier signed by the user can specifically be: data network name (Data Network Name, DNN); that is, AMF obtains the mapping relationship between the DNN signed by the user and the slice information from the UDM.

[0069] Among them, DNN and APN are both network identifiers, which can be considered to be consistent. Then AMF infers the mapping relationship between the APN and slice information of the session through the network identifier corresponding to the session and the user contract information, and can obtain the slice information corresponding to the session.

[0070] Furthermore, AMF selects a suitable V-SMF or I-SMF based on the obtained slice information and TA (Tracking Area), and sends a first session creation request message to the selected V-SMF or I-SMF, and carries the slice information corresponding to the session in the first session creation request message.

[0071] Continuing with the above example, in the contract information, the mapping relationship between the network identifier signed by the user and the slice information is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

[0072] In other words, the first solution is applicable to the scenario where the mapping between slices and DNN is "1:N", in which case, a unique corresponding slice can be determined based on one DNN. In other scenarios, such as the scenario where the mapping between slices and DNN is "M:1", a unique corresponding slice cannot be obtained based on one DNN; M is greater than 1.

[0073] Solution 1 does not require additional configuration of interoperable dedicated slices for the entire network, and can meet the needs of different slice isolation scenarios; it does not require AMF to initiate the secondary insertion process of V / I-SMF, which shortens the switching delay; and is suitable for scenarios where the slice and DNN are 1:N. Under this solution, there is no need for AMF and SMF networks to communicate with each other in the entire network, and the requirements for AMF functions are relatively low.

[0074] For solution 2, before the session is created, AMF obtains the slice information corresponding to the session from the anchor SMF, including:

[0075] Before the session is created, sending a second session creation request message to the anchor SMF;

[0076] Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session;

[0077] According to the second session creation response message, determine the slice information corresponding to the session.

[0078] Before sending the second session creation request message to the anchor SMF, the method further includes:

[0079] Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF;

[0080] According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

[0081] In other words, when AMF determines that the user is a 4 / 5G interoperable user and is not in the service area of ​​the anchor SMF and needs to insert V / I-SMF, it does not directly select and insert V / I-SMF, but directly initiates a session creation request (i.e., the second session creation request message) to the anchor SMF. The anchor SMF directly sends the slice information corresponding to the correct session to AMF, and AMF initiates the V / I-SMF insertion process after obtaining the slice information corresponding to the correct session.

[0082] For example, AMF obtains the IP address of the anchor SMF by obtaining the FQDN of SMF / PGW-C from MME, and determines that it is a 4 / 5G interoperable user, but the user is not within the TA range of the anchor SMF and needs to be inserted into V / I-SMF. AMF does not initiate a request to insert V / I-SMF, but directly initiates a second session creation request message to the anchor SMF without carrying the corresponding slice information of the session. After receiving the second session creation request message from AMF, the anchor SMF directly sends the session information previously created by the user (including slice information and DNN corresponding to the session, etc.) to AMF through the second session creation response message. After AMF receives the slice information corresponding to the session sent by the anchor SMF, it selects a suitable V / I-SMF according to the slice information and TA information, and sends the first session creation request message to the selected V / I-SMF. V / I-SMF transparently transmits the first session creation request message to the anchor SMF, and after receiving the first session creation response message returned by the anchor SMF, it transparently transmits it to AMF.

[0083] Solution 2 does not require additional configuration of interoperable dedicated slices for the entire network, and can meet different slice isolation scenarios; it does not require AMF to initiate the secondary insertion process of V / I-SMF, shortening the switching delay; and there are no additional requirements for the mapping relationship between slices and DNN. However, this solution requires the intercommunication between the AMF and SMF networks of the entire network, and has high requirements for the functions of AMF.

[0084] It should be noted that in actual applications, technical personnel in this field may choose to obtain the slice information corresponding to the session through Solution 1 or Solution 2 based on different business requirements, different networking solutions, etc.; no specific limitation is made here.

[0085] In summary, AMF obtains the slice information corresponding to the session before the session is created, so that AMF can select SMF and create the session according to the correct slice information, avoiding the process of inserting SMF twice, shortening the switching delay, and improving the user service experience; at the same time, AMF does not need to configure interoperability dedicated slices, reducing the workload of the bureau data.

[0086] like Figure 2 As shown, an embodiment of the present invention further provides a session creation device, which is applied to an access and mobility management function AMF, including:

[0087] The acquisition module 201 is used to acquire the slice information corresponding to the session before the session is created;

[0088] The session creation module 202 is used to select a session management function SMF according to the slice information, and send a first session creation request message to the selected SMF.

[0089] As an optional embodiment, the acquisition module 201 includes:

[0090] The first acquisition submodule is used to acquire the slice information corresponding to the session according to the network identifier corresponding to the session and the user subscription information before the session is created;

[0091] and / or,

[0092] The second acquisition submodule is used to obtain the slice information corresponding to the session from the anchor SMF before the session is created.

[0093] As an optional embodiment, the first acquisition submodule includes:

[0094] The first unit is used to obtain a network identifier and user subscription information corresponding to a session before the session is created, where the user subscription information includes a mapping relationship between a network identifier and slice information subscribed by the user;

[0095] The second unit is used to query the user subscription information according to the network identifier corresponding to the session, and determine that the slice information that has a mapping relationship with the network identifier is the slice information corresponding to the session;

[0096] Among them, the first session creation request message includes: slice information corresponding to the session.

[0097] As an optional embodiment, in the contract information, the mapping relationship between the network identifier signed by the user and the slice information is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

[0098] As an optional embodiment, the second sub-acquisition module includes:

[0099] The third unit is used to send a second session creation request message to the anchor SMF before the session is created;

[0100] The fourth unit is used to receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session;

[0101] The fifth unit is used to determine the slice information corresponding to the session based on the second session creation response message.

[0102] As an optional embodiment, the device further includes:

[0103] An address determination module, used to determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF;

[0104] The determination module is used to determine whether the user is a 4G or 5G interoperability user according to the IP address of the anchor SMF, and the user is not within the tracking area of ​​the anchor SMF.

[0105] In an embodiment of the present invention, AMF obtains the slice information corresponding to the session before the session is created, so that AMF can select SMF and create the session according to the correct slice information, avoiding the process of inserting SMF twice, shortening the switching delay, and improving the user service experience; at the same time, AMF does not need to configure interoperability dedicated slices, reducing the local data workload.

[0106] It should be noted that the session creation device provided in the embodiment of the present invention is a device capable of executing the above-mentioned session creation method, and all embodiments of the above-mentioned session creation method are applicable to the device and can achieve the same or similar beneficial effects.

[0107] like Figure 3 As shown, the embodiment of the present invention further provides an access and mobility management function AMF, including a processor 300 and a transceiver 310, wherein the transceiver 310 receives and sends data under the control of the processor 300, and is characterized in that the processor is used to perform the following operations:

[0108] Before creating a session, obtain the slice information corresponding to the session;

[0109] According to the slice information, a session management function SMF is selected, and a first session creation request message is sent to the selected SMF.

[0110] As an optional embodiment, the processor 300 is further configured to perform the following operations:

[0111] Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information;

[0112] or,

[0113] Before a session is created, the slice information corresponding to the session is obtained from the anchor SMF.

[0114] As an optional embodiment, the processor 300 is further configured to perform the following operations:

[0115] Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user;

[0116] According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session;

[0117] Among them, the first session creation request message includes: slice information corresponding to the session.

[0118] As an optional embodiment, in the contract information, the mapping relationship between the network identifier signed by the user and the slice information is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

[0119] As an optional embodiment, the processor 300 is further configured to perform the following operations:

[0120] Before the session is created, sending a second session creation request message to the anchor SMF;

[0121] Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session;

[0122] According to the second session creation response message, determine the slice information corresponding to the session.

[0123] As an optional embodiment, the processor 300 is further configured to perform the following operations:

[0124] Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF;

[0125] According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

[0126] In an embodiment of the present invention, AMF obtains the slice information corresponding to the session before the session is created, so that AMF can select SMF and create the session according to the correct slice information, avoiding the process of inserting SMF twice, shortening the switching delay, and improving the user service experience; at the same time, AMF does not need to configure interoperability dedicated slices, reducing the local data workload.

[0127] It should be noted that the AMF provided in the embodiment of the present invention is an AMF capable of executing the above-mentioned session creation method, so all embodiments of the above-mentioned session creation method are applicable to the AMF and can achieve the same or similar beneficial effects.

[0128] An embodiment of the present invention further provides an AMF, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the various processes in the session creation method embodiment as described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0129] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, each process in the embodiment of the session creation method described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not described here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0130] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0131] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A device that specifies functions in one or more processes and / or one or more blocks.

[0132] 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 work in a specific manner, so that the instructions stored in the computer-readable storage medium produce a paper product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0133] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that the computer or other programmable device executes a series of operating steps to produce a computer-implemented process, thereby providing instructions executed on the computer or other programmable device for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0134] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A session creation method, performed by an access and mobility management function AMF, characterized in that: include: Before creating a session, obtain the slice information corresponding to the session; Select a session management function SMF according to the slice information, and send a first session creation request message to the selected SMF; Before the session is created, the slice information corresponding to the session is obtained, including: Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information; Before the session is created, obtaining the slice information corresponding to the session according to the network identifier corresponding to the session and the user subscription information includes: Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user; According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session; The first session creation request message includes: slice information corresponding to the session; or, Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF; Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF, including: Before the session is created, sending a second session creation request message to the anchor SMF; Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session; According to the second session creation response message, determine the slice information corresponding to the session.

2. The method according to claim 1, characterized in that In the contract information, the mapping relationship between the network identifier and the slice information signed by the user is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

3. The method according to claim 1, characterized in that Before sending the second session creation request message to the anchor SMF, the method further includes: Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF; According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

4. A session creation device, applied to an access and mobility management function AMF, characterized in that: include: The acquisition module is used to obtain the slice information corresponding to the session before the session is created; A session creation module, configured to select a session management function SMF according to the slice information, and send a first session creation request message to the selected SMF; The acquisition module is further used for: Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information; Before the session is created, obtaining the slice information corresponding to the session according to the network identifier corresponding to the session and the user subscription information includes: Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user; According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session; The first session creation request message includes: slice information corresponding to the session; or, Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF; Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF, including: Before the session is created, sending a second session creation request message to the anchor SMF; Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session; According to the second session creation response message, determine the slice information corresponding to the session.

5. An access and mobility management function AMF, comprising a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, characterized in that: The processor is configured to perform the following operations: Before creating a session, obtain the slice information corresponding to the session; Select a session management function SMF according to the slice information, and send a first session creation request message to the selected SMF; The processor is further configured to perform the following operations: Before a session is created, the slice information corresponding to the session is obtained according to the network identifier corresponding to the session and the user subscription information; The processor is further configured to perform the following operations: Before creating a session, obtain the network identifier and user subscription information corresponding to the session, where the user subscription information includes: a mapping relationship between the network identifier and the slice information subscribed by the user; According to the network identifier corresponding to the session, query in the user contract information to determine that the slice information having a mapping relationship with the network identifier is the slice information corresponding to the session; The first session creation request message includes: slice information corresponding to the session; or, Before the session is created, the slice information corresponding to the session is obtained from the anchor SMF; The processor is further configured to perform the following operations: Before the session is created, sending a second session creation request message to the anchor SMF; Receive a second session creation response message sent by the anchor SMF, where the second session creation response message includes: slice information corresponding to the session and a network identifier corresponding to the session; According to the second session creation response message, determine the slice information corresponding to the session.

6. The AMF according to claim 5, characterized in that In the contract information, the mapping relationship between the network identifier and the slice information signed by the user is: N network identifiers correspond to 1 slice information, where N is an integer greater than or equal to 1.

7. The AMF according to claim 5, characterized in that The processor is further configured to perform the following operations: Determine the IP address of the anchor SMF according to the fully qualified domain name FQDN of the anchor SMF; According to the IP address of the anchor SMF, it is determined that the user is a 4G or 5G interoperability user and that the user is not within the tracking area of ​​the anchor SMF.

8. An AMF comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the session creation method according to any one of claims 1 to 3 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps in the session creation method according to any one of claims 1 to 3 are implemented.

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