A session creation method, network element and computer-readable storage medium

Abstract

Disclosed herein are a session creation method, a network element, and a computer-readable storage medium. The method includes: a first session exists between a first access and mobility management function (AMF) network element and a session management function (SMF) network element; a second AMF network element obtains first information, the first information including identification information of the SMF network element, a data network name (DNN) of the first session, and single network slice selection auxiliary information (SNSSAI) of the first session; and the second AMF network element creates a second session for a terminal device.

Description

Technical Field

[0001] The present application relates to a wireless communication network, for example, to a session creation method, a network element, and a computer-readable storage medium. Background Art

[0002] During the Protocol Data Unit (PDU) session creation process, the Access and Mobility Management Function (AMF) selects a Session Management Function (SMF) based on the device's subscription information. However, there is currently no detailed discussion of how the AMF obtains the data corresponding to the device's subscription information. Summary of the Invention

[0003] The present application provides a session creation method, a network element, and a computer-readable storage medium, which can ensure the normal creation of a session and improve the transmission efficiency and stability of the system.

[0004] An embodiment of the present application provides a session creation method, wherein a first session exists between a first access and mobility management function (AMF) network element and a session management function (SMF) network element, the method comprising:

[0005] The second AMF network element obtains the first information, where the first information includes the identification information of the SMF network element, the data network name DNN of the first session, and the single network slice selection auxiliary information SNSSAI of the first session;

[0006] The second AMF network element creates a second session for the terminal device.

[0007] An embodiment of the present application provides a session creation method, wherein a first session exists between a first access and mobility management function (AMF) network element and a session management function (SMF) network element, the method comprising:

[0008] The unified data management UDM network element sends the first information to the second AMF, where the first information includes the identification information of the SMF network element, the data network name DNN of the first session, and the single network slice selection auxiliary information SNSSAI of the first session.

[0009] An embodiment of the present application provides an access and mobility management function AMF network element, including: a processor, the processor being used to implement the method of any of the above embodiments when executing a computer program.

[0010] An embodiment of the present application provides a unified data management (UDM) network element, including: a processor, configured to implement the method of any of the above embodiments when executing a computer program.

[0011] An embodiment of the present application further provides a computer-readable storage medium storing a computer program, which implements the method of any of the above embodiments when the computer program is executed by a processor.

[0012] With respect to the above embodiments and other aspects of the present application and their implementation, further description is provided in the accompanying drawings, detailed description and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A network architecture diagram of a mobile communication network provided by an embodiment;

[0014] Figure 2 A flowchart of a session creation method provided by an embodiment;

[0015] Figure 3 A flowchart of another session creation method provided by an embodiment;

[0016] Figure 4 An interactive diagram of a session creation method provided by an embodiment;

[0017] Figure 5 An interactive diagram of another session creation method provided by an embodiment;

[0018] Figure 6 An interactive diagram of another session creation method provided by an embodiment;

[0019] Figure 7 An interactive diagram of another session creation method provided by an embodiment;

[0020] Figure 8 An interactive diagram of another session creation method provided by an embodiment;

[0021] Figure 9 A schematic diagram of the structure of a session creation device provided by an embodiment;

[0022] Figure 10 A schematic diagram of the structure of another session creation device provided by an embodiment;

[0023] Figure 11 A schematic diagram of the structure of an AMF network element provided in one embodiment;

[0024] Figure 12 A schematic diagram of the structure of a UDM network element provided in an embodiment. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the process of creating a PDU session, when the AMF network element selects the SMF network element, if the subscription information of the user equipment (UE) indicates that at least two sessions with the same data network name (DNN) and the same single network slice selection assistance information (SNSSAI) use the same SMF network element, then the AMF network element will select the SMF network element based on the DNN and SNSSAI carried by the UE in the PDU session creation request message. If there are already other PDU sessions (also called existing PDU sessions) under the DNN and SNSSAI carried by the UE in the PDU session creation request message, the AMF network element selects the same SMF network element as the existing PDU session for the new PDU session; if there are no other PDU sessions under the DNN and SNSSAI carried by the UE in the PDU session creation request message, the AMF network element selects the SMF network element normally.

[0027] Assume that a UE registers with AMF1 through the 3rd Generation Partnership Project (3GPP) and creates PDU Session 1 under DNN1 and SNSSAI1. AMF1 selects SMF1 for PDU Session 1. Subsequently, the UE registers with AMF2 through a non-3GPP (non-3GPP) protocol and requests AMF2 to create PDU Session 2, also based on DNN1 and SNSSAI1. Because the UE's subscription information indicates that at least two sessions with the same DNN and SNSSAI use the same SMF network element, AMF2 attempts to obtain information about the SMF network element used by the existing PDU session from the Unified Data Management (UDM) network element. However, the existing UDM network element only returns information about the association between SMF1 and DNN1, without information about the SNSSAI. This makes it impossible for AMF2 to determine whether SMF1 is associated with both DNN1 and SNSSAI1, and therefore cannot guarantee that SMF1 will also be selected for PDU Session 2.

[0028] Figure 1 1 is a network architecture diagram of a mobile communication network provided by an embodiment, and the mobile communication network includes but is not limited to the fifth generation mobile communication network (5th-Generation, 5G). Figure 1As shown, the network architecture of the network may include a core network device 110, a wireless access network device 120 and at least one terminal device (such as Figure 1 The terminal device 130 and the terminal device 140 in the figure are connected to the wireless access network device via wireless means, and the wireless access network device is connected to the core network device via wireless or wired means. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated into the same physical device, or a physical device can integrate some functions of the core network device and some functions of the wireless access network device. The terminal device can be fixed or movable. It is understandable that Figure 1 This is just a schematic diagram of the network. The mobile communication network may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 The embodiments of the present application do not limit the number of core network devices, wireless access network devices, and terminal devices included in the mobile communication network.

[0029] A radio access network device may be one or more types of base stations, an evolved node B (base station), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), a transmission and reception point (TRP), a Universal Terrestrial Radio Access (UTRA), or an Evolved Universal Terrestrial Radio Access (EUTRA). It may also be a gNB in ​​a New Radio Access Technology (NR) system, or a component or part of a base station, such as a central unit (CU), a distributed unit (DU), or a baseband unit (BBU). A terminal device may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), user equipment data card, or relay. The terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a computer with wireless transceiver function, and can also be a wireless terminal used in scenarios such as virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, transportation safety, smart city, and smart home.

[0030] In an embodiment of the present application, a session creation method, network element, and computer-readable storage medium are provided that can be run on the above-mentioned network architecture, which can ensure the normal establishment of the session and improve the transmission efficiency and stability of the system. The operating environment of the above-mentioned session creation method provided in the embodiment of the present application is not limited to the above-mentioned network architecture.

[0031] The following describes the session creation method, network elements, and technical effects thereof.

[0032] Figure 2 This is a flow chart of a session creation method provided by an embodiment. Figure 2 As shown, the method provided in this embodiment is applicable to AMF network elements. When there is a first session between the first AMF network element and the SMF network element, the method includes the following steps.

[0033] S110. The second AMF network element obtains the first information, where the first information includes the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0034] In one embodiment, the second AMF network element obtains the first information, including:

[0035] The second AMF network element receives a first request message sent by the terminal device, where the first request message is used to instruct the terminal device to register on the second AMF network element. The second AMF network element sends a second request message to the UDM network element based on the first request message, where the second request message is used to request data from the UDM network element. The second AMF network element receives the first information sent by the UDM network element. The first information also includes second information, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0036] In one embodiment, the second AMF network element obtains the first information, including:

[0037] The second AMF network element receives a first request message sent by the terminal device, where the first request message is used to indicate that the terminal device is registered on the second AMF network element; the second AMF network element sends a second request message to the UDM network element based on the first request message, where the second request message is used to request data from the UDM network element; the second AMF network element receives the first information sent by the UDM network element, and receives the second information sent by the UDM network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0038] In one embodiment, before the first session, the method further includes:

[0039] The second AMF network element receives a first request message sent by the terminal device, and the first request message is used to instruct the terminal device to register on the second AMF network element; the second AMF network element sends a second request message to the UDM network element based on the first request message, and the second request message is used to request data from the UDM network element; the second AMF network element receives the second information sent by the UDM network element, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element; the second AMF network element sends a third request message to the UDM network element, and the third request message is used to request subscription to the first information. In this way, after receiving the first information sent by the SMF network element, the UDM network element can send the first information to the second AMF network element.

[0040] In one embodiment, before the first session, the method further includes:

[0041] The second AMF network element receives a first request message sent by the terminal device, and the first request message is used to instruct the terminal device to register on the second AMF network element; the second AMF network element sends a second request message to the UDM network element based on the first request message, and the second request message is used to request data from the UDM network element; the second AMF network element receives the second information sent by the UDM network element, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element. In this way, after receiving the fourth request message sent by the terminal device, the second AMF network element sends a fifth request message to the UDM network element, and the fourth request message is used to request the creation of a second session, and the fifth request message is used to request data from the UDM network element; the second AMF network element receives the first information sent by the UDM network element.

[0042] S120. The second AMF network element creates a second session for the terminal device.

[0043] In one embodiment, the method for the second AMF network element to create a second session for the terminal device may include:

[0044] Step 1) The second AMF network element receives a fourth request message sent by the terminal device, where the fourth request message is used to request the creation of a second session. The fourth request message includes the DNN of the second session and the SNSSAI of the second session.

[0045] Step 2) The second AMF network element creates a second session for the terminal device based on the DNN of the second session and the SNSSAI of the second session.

[0046] In one embodiment, step 2) may specifically include: the second AMF network element determines that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session; the second AMF network element creates a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element; the second AMF network element sends a feedback message to the terminal device, and the feedback message is used to indicate that the creation of the second session is completed.

[0047] Figure 3 This is a flow chart of another session creation method provided by an embodiment. Figure 3 As shown, the method provided in this embodiment is applicable to UDM network elements. When there is a first session between the first AMF network element and the SMF network element, the method includes the following steps.

[0048] S210. The UDM network element receives the first information sent by the SMF network element.

[0049] S220. The UDM network element sends the first information to the second AMF. The first information includes the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0050] In one embodiment, the UDM network element sends the first information to the second AMF, including:

[0051] The UDM network element receives a second request message sent by the second AMF network element and sends a first information to the second AMF network element. The second request message is used to request data from the UDM network element. The first information also includes second information, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0052] In one embodiment, the UDM network element sends the first information to the second AMF, including:

[0053] The UDM network element receives a second request message sent by the second AMF network element, sends first information to the second AMF network element, and sends second information to the second AMF network element, where the second request message is used to request data from the UDM network element, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0054] In one embodiment, before the first session, the method further includes:

[0055] The UDM network element receives a second request message sent by the second AMF network element, where the second request message is used to request data from the UDM network element. The UDM network element sends second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element. The UDM network element receives a third request message sent by the second AMF network element, where the third request message is used to request subscription to the first information. In this way, after receiving the first information sent by the SMF network element, the UDM network element can send the first information to the second AMF network element.

[0056] In one embodiment, before the first session, the method further includes:

[0057] The UDM network element receives a second request message sent by the second AMF network element, where the second request message is used to request data from the UDM network element. The UDM network element sends second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element. In this way, after receiving the fourth request message sent by the terminal device, the second AMF network element sends a fifth request message to the UDM network element, where the fourth request message is used to request the creation of a second session, and the fifth request message is used to request data from the UDM network element, so that the UDM network element sends the first information to the second AMF network element.

[0058] Here are some interactive implementation methods to illustrate Figure 2 and Figure 3 The following interaction implementation methods can be executed separately or in combination with each other, and the present application embodiment does not impose any specific restrictions on this.

[0059] Figure 4 This is an interactive diagram of a session creation method provided by an embodiment, such as Figure 4 As shown, the method includes the following steps.

[0060] S300. The UE successfully registers on the first AMF network element through 3GPP.

[0061] S301. The UE sends a first session creation request message to the first AMF network element. The first session creation request message is used to request the creation of a first session. The first session creation request message includes the DNN of the first session and the SNSSAI of the first session.

[0062] S302. The first AMF network element receives a first session creation request message sent by the UE and selects an SMF network element for the first session.

[0063] S303. Create a first session between the first AMF network element and the selected SMF network element.

[0064] S304. The first AMF network element sends a first session creation completion message to the UE. The first session creation completion message is used to indicate that the first session creation is complete.

[0065] S305. The UE receives a first session creation completion message sent by the first AMF network element.

[0066] S306. The SMF network element sends an SMF registration request message to the UDM network element. The SMF registration request message includes first information, namely, the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0067] S307. The UDM network element receives the SMF registration request message sent by the SMF network element.

[0068] It should be noted that the above steps S300-S307 apply to the following scenarios: 1) the UE creates a session for the first time; 2) the UE creates a session and the session is released before another session is created. In other words, the above steps S300-S307 apply to the scenario where no session exists on the UE at the current moment.

[0069] S308. The UE sends a first request message to the second AMF network element through Non-3GPP. The first request message is used to instruct the UE to register on the second AMF network element.

[0070] S309. The second AMF network element receives the first request message sent by the UE.

[0071] S310. The second AMF network element sends a second request message to the UDM network element. The second request message is used to request data from the UDM network element.

[0072] It should be noted that the data requested by the second AMF network element to the UDM network element may be at least one of the UE's subscription information and information related to the SMF.

[0073] S311. The UDM network element receives the second request message sent by the second AMF network element, and sends the first information to the second AMF network element.

[0074] When the data requested by the second AMF network element to the UDM network element is the UE's subscription information and information related to the SMF, the first information also includes second information, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0075] S312. The second AMF network element receives the first information sent by the UDM network element.

[0076] S313. The second AMF network element sends a registration completion message to the UE. The registration completion message is used to indicate that the UE is registered on the second AMF network element.

[0077] S314. The UE receives a registration completion message sent by the second AMF network element.

[0078] S315. The UE sends a fourth request message to the second AMF network element. The fourth request message is used to request the creation of a second session. The fourth request message includes the DNN of the second session and the SNSSAI of the second session.

[0079] S316. The second AMF network element receives the fourth request message sent by the UE, and determines that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session.

[0080] S317. The second AMF network element creates a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element.

[0081] S318. The second AMF network element sends a feedback message to the UE, where the feedback message is used to indicate that the second session creation is complete.

[0082] S319. The UE receives a feedback message sent by the second AMF network element.

[0083] In this way, in a scenario where the UE has signed up for at least two sessions with the same DNN and SNSSAI using the same SMF network element, the UE first registers with the first AMF network element through 3GPP and creates the first session; then registers with the second AMF network element through Non-3GPP and requests to create the second session. Since the second AMF network element can directly request the UDM network element to obtain the SMF network element's identification information, the DNN of the first session, and the SNSSAI of the first session, the second AMF network element can successfully select the same SMF network element as the first session for the second session. This ensures the normal creation of sessions and improves the transmission efficiency and stability of the system.

[0084] Figure 5 This is an interactive diagram of another session creation method provided by an embodiment, such as Figure 5 As shown, the method includes the following steps.

[0085] S400. The UE successfully registers on the first AMF network element through 3GPP.

[0086] S401. The UE sends a first session creation request message to the first AMF network element. The first session creation request message is used to request creation of a first session. The first session creation request message includes the DNN of the first session and the SNSSAI of the first session.

[0087] S402. The first AMF network element receives a first session creation request message sent by the UE and selects an SMF network element for the first session.

[0088] S403. Create a first session between the first AMF network element and the selected SMF network element.

[0089] S404. The first AMF network element sends a first session creation completion message to the UE. The first session creation completion message is used to indicate that the first session creation is complete.

[0090] S405. The UE receives a first session creation completion message sent by the first AMF network element.

[0091] S406. The SMF network element sends an SMF registration request message to the UDM network element. The SMF registration request message includes first information, namely, the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0092] S407. The UDM network element receives the SMF registration request message sent by the SMF network element.

[0093] It should be noted that the above steps S400-S407 apply to the following scenarios: 1) the UE creates a session for the first time; 2) the UE creates a session and the session is released before another session is created. In other words, the above steps S400-S407 apply to the scenario where no session exists on the UE at the current moment.

[0094] S408. The UE sends a first request message to the second AMF network element through Non-3GPP. The first request message is used to instruct the UE to register on the second AMF network element.

[0095] S409. The second AMF network element receives the first request message sent by the UE.

[0096] S410. The second AMF network element sends a second request message to the UDM network element. The second request message is used to request data from the UDM network element.

[0097] It should be noted that the data requested by the second AMF network element to the UDM network element may be at least one of the UE's subscription information and information related to the SMF.

[0098] S411. The UDM network element receives the second request message sent by the second AMF network element, and sends the first information to the second AMF network element.

[0099] S412. The UDM network element sends the second information to the second AMF network element.

[0100] When the data requested by the second AMF network element from the UDM network element is information related to the SMF, the UDM network element sends the first information to the second AMF network element. In addition, the second AMF network element also needs to request the UE's subscription information from the UDM network element, so that the UDM network element sends the second information to the second AMF network element. That is, the second request message in step S410 is sent twice, once for requesting information related to the SMF, and the UDM network element executes step S411, and once for requesting the UE's subscription information, and the UDM network element executes step S412.

[0101] S413. The second AMF network element receives the first information sent by the UDM network element, and the second AMF network element receives the second information sent by the UDM network element.

[0102] It should be noted that there is no time sequence between the first and second messages sent by the UDM network element. That is, the UDM network element may send the first message first and then the second message; it may send the second message first and then the first message; or it may send the first and second messages simultaneously. Similarly, there is no time sequence between the first and second messages received by the second AMF network element. This application does not impose any specific restrictions on this.

[0103] S414. The second AMF network element sends a registration completion message to the UE. The registration completion message is used to indicate that the UE is registered on the second AMF network element.

[0104] S415. The UE receives a registration completion message sent by the second AMF network element.

[0105] S416. The UE sends a fourth request message to the second AMF network element. The fourth request message is used to request creation of a second session. The fourth request message includes the DNN of the second session and the SNSSAI of the second session.

[0106] S417. The second AMF network element receives the fourth request message sent by the UE, and determines that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session.

[0107] S418. The second AMF network element creates a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element.

[0108] S419. The second AMF network element sends a feedback message to the UE, where the feedback message is used to indicate that the second session creation is complete.

[0109] S420. The UE receives a feedback message sent by the second AMF network element.

[0110] and Figure 4The difference between the session creation method shown is that the second information used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element is no longer integrated in the first information, but is sent from the UDM network element to the second AMF network element as two pieces of information separately from the first information.

[0111] Figure 6 This is an interactive diagram of another session creation method provided by an embodiment, such as Figure 6 As shown, the method includes the following steps.

[0112] S500. The UE successfully registers on the first AMF network element through Non-3GPP.

[0113] S501. The UE sends a first request message to the second AMF network element through 3GPP. The first request message is used to instruct the UE to register on the second AMF network element.

[0114] S502. The second AMF network element receives the first request message sent by the UE.

[0115] S503. The second AMF network element sends a second request message to the UDM network element. The second request message is used to request data from the UDM network element.

[0116] It should be noted that the data requested by the second AMF network element to the UDM network element may be at least one of the UE's subscription information and information related to the SMF.

[0117] S504. The UDM network element receives the second request message sent by the second AMF network element and sends second information to the second AMF network element.

[0118] Since there is no session on the UE at the current moment, the UDM network element will not send SMF-related information to the second AMF network element, but only send the second information. The second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0119] S505. The second AMF network element receives the second information sent by the UDM network element.

[0120] S506. The second AMF network element sends a registration completion message to the UE. The registration completion message is used to indicate that the UE is registered on the second AMF network element.

[0121] S507. The UE receives a registration completion message sent by the second AMF network element.

[0122] S508. The UE sends a first session creation request message to the first AMF network element. The first session creation request message is used to request creation of a first session. The first session creation request message includes the DNN of the first session and the SNSSAI of the first session.

[0123] S509. The first AMF network element receives the first session creation request message sent by the UE and selects an SMF network element for the first session.

[0124] S510. Create a first session between the first AMF network element and the selected SMF network element.

[0125] S511. The first AMF network element sends a first session creation completion message to the UE, where the first session creation completion message is used to indicate that the first session creation is complete.

[0126] S512. The UE receives a first session creation completion message sent by the first AMF network element.

[0127] S513. The SMF network element sends an SMF registration request message to the UDM network element. The SMF registration request message includes the first information, namely, the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0128] S514. The UDM network element receives the SMF registration request message sent by the SMF network element.

[0129] S515. The UE sends a fourth request message to the second AMF network element. The fourth request message is used to request the creation of a second session. The fourth request message includes the DNN of the second session and the SNSSAI of the second session.

[0130] S516. The second AMF network element receives the fourth request message sent by the UE.

[0131] S517. The second AMF network element sends a fifth request message to the UDM network element. The fifth request message is used to request data from the UDM network element.

[0132] Since the second AMF network element only received the second information from the UDM network element in step S505, and the UE has created the first session at the current moment, in order to satisfy the UE's contracted at least two sessions with the same DNN and the same SNSSAI using the same SMF network element, the second AMF network element requests data from the UDM network element again.

[0133] S518. The UDM network element receives the fifth request message sent by the second AMF network element, and sends the first information to the second AMF network element.

[0134] S519. The second AMF network element receives the first information sent by the UDM network element.

[0135] S520. The second AMF network element determines that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session.

[0136] S521. The second AMF network element creates a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element.

[0137] S522. The second AMF network element sends a feedback message to the UE, where the feedback message is used to indicate that the second session creation is complete.

[0138] S523. The UE receives a feedback message sent by the second AMF network element.

[0139] In this way, in the scenario where the UE has signed at least two sessions with the same DNN and the same SNSSAI using the same SMF network element, the UE registers with the first AMF network element and the second AMF network element through Non-3GPP and 3GPP respectively. Subsequently, the first session is created between the first AMF network element and the SMF network element, and then a request is made to create the second session. Since the second AMF network element can directly request the UDM network element to obtain the identification information of the SMF network element, the DNN of the first session and the SNSSAI of the first session, the second AMF network element can successfully select the same SMF network element as the first session for the second session. This ensures the normal creation of the session and improves the transmission efficiency and stability of the system.

[0140] Figure 7 This is an interactive diagram of another session creation method provided by an embodiment, such as Figure 7 As shown, the method includes the following steps.

[0141] S600. The UE successfully registers on the first AMF network element through Non-3GPP.

[0142] S601. The UE sends a first request message to the second AMF network element through 3GPP. The first request message is used to instruct the UE to register on the second AMF network element.

[0143] S602. The second AMF network element receives the first request message sent by the UE.

[0144] S603. The second AMF network element sends a second request message to the UDM network element. The second request message is used to request data from the UDM network element.

[0145] It should be noted that the data requested by the second AMF network element to the UDM network element may be at least one of the UE's subscription information and information related to the SMF.

[0146] S604. The UDM network element receives the second request message sent by the second AMF network element and sends second information to the second AMF network element.

[0147] Since there is no session on the UE at the current moment, the UDM network element will not send SMF-related information to the second AMF network element, but only send the second information. The second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0148] S605. The second AMF network element receives the second information sent by the UDM network element.

[0149] S606. The second AMF network element sends a third request message to the UDM network element, where the third request message is used to request subscription to the first information.

[0150] Among them, the third request message can be actively triggered by the second AMF network element based on the second information, or it can be triggered by the second AMF network element after failing to obtain the first information.

[0151] S607. The UDM network element receives the third request message sent by the second AMF network element.

[0152] S608. The second AMF network element sends a registration completion message to the UE. The registration completion message is used to indicate that the UE is registered on the second AMF network element.

[0153] S609. The UE receives a registration completion message sent by the second AMF network element.

[0154] S610. The UE sends a first session creation request message to the first AMF network element. The first session creation request message is used to request creation of a first session. The first session creation request message includes the DNN of the first session and the SNSSAI of the first session.

[0155] S611. The first AMF network element receives a first session creation request message sent by the UE and selects an SMF network element for the first session.

[0156] S612. Create a first session between the first AMF network element and the selected SMF network element.

[0157] S613. The first AMF network element sends a first session creation completion message to the UE. The first session creation completion message is used to indicate that the first session creation is complete.

[0158] S614. The UE receives a first session creation completion message sent by the first AMF network element.

[0159] S615. The SMF network element sends an SMF registration request message to the UDM network element. The SMF registration request message includes first information, namely, the identification information of the SMF network element, the DNN of the first session, and the SNSSAI of the first session.

[0160] S616. The UDM network element receives the SMF registration request message sent by the SMF network element.

[0161] S617. The UDM network element sends the first information to the second AMF network element.

[0162] Since in the above step S607, the UDM network element received the third request message for requesting to subscribe to the first information, when the UDM network element receives the first information sent by the SMF network element, it actively sends the first information to the second AMF network element.

[0163] S618. The UE sends a fourth request message to the second AMF network element. The fourth request message is used to request the creation of a second session. The fourth request message includes the DNN of the second session and the SNSSAI of the second session.

[0164] S619. The second AMF network element receives the fourth request message sent by the UE.

[0165] S620. The second AMF network element determines that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session.

[0166] S621. The second AMF network element creates a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element.

[0167] S622. The second AMF network element sends a feedback message to the UE, where the feedback message is used to indicate that the second session creation is complete.

[0168] S623. The UE receives a feedback message sent by the second AMF network element.

[0169] In this way, in the scenario where the UE has signed at least two sessions with the same DNN and the same SNSSAI using the same SMF network element, the UE registers with the first AMF network element and the second AMF network element through Non-3GPP and 3GPP respectively. After the first session is created between the first AMF network element and the SMF network element, the SMF sends information related to the SMF (first information) to the UDM network element. Since the second AMF network element has subscribed to the first information to the UDM network element, it can obtain the identification information of the SMF network element, the DNN of the first session and the SNSSAI of the first session issued by the UDM network element. Therefore, when the UE requests to create a second session, the second AMF network element can successfully select the same SMF network element as the first session for the second session. This ensures the normal creation of the session and improves the transmission efficiency and stability of the system.

[0170] Figure 8 This is an interactive diagram of another session creation method provided by an embodiment, such as Figure 8 As shown, the method includes the following steps.

[0171] S700. The UE successfully registers on the first AMF network element through 3GPP.

[0172] Among them, the first AMF network element is located in the visited public land mobile network (VPLMN).

[0173] S701. The UE sends a first session creation request message to the first AMF network element. The first session creation request message is used to request creation of a first session. The first session creation request message includes the DNN of the first session and the SNSSAI of the first session.

[0174] Among them, the SNSSAI of the first session includes the visited single network slice selection assistance information (vSNSSAI) of the first session and the local single network slice selection assistance information (hSNSSAI) of the first session.

[0175] S702. The first AMF network element receives the first session creation request message sent by the UE, determines to create the first session in home-routed roaming mode, and selects an SMF network element for the first session.

[0176] Among them, the SMF network elements include the visited session management function (vSMF) network element and the local session management function (hSMF) network element.

[0177] S703. Create a first session between the first AMF network element, the vSMF network element and the hSMF network element.

[0178] S704. The first AMF network element sends a first session creation completion message to the UE. The first session creation completion message is used to indicate that the first session creation is complete.

[0179] S705. The UE receives a first session creation completion message sent by the first AMF network element.

[0180] S706. The hSMF network element sends an SMF registration request message to the UDM network element. The SMF registration request message includes first information, namely, the identification information of the hSMF network element, the DNN of the first session, and the hSNSSAI of the first session.

[0181] S707. The UDM network element receives the SMF registration request message sent by the hSMF network element.

[0182] S708. The UE sends a first request message to the second AMF network element through Non-3GPP. The first request message is used to instruct the UE to register on the second AMF network element.

[0183] Among them, the second AMF network element is located in the Home Public Land Mobile Network (HPLMN).

[0184] S709. The second AMF network element receives the first request message sent by the UE.

[0185] S710. The second AMF network element sends a second request message to the UDM network element, where the second request message is used to request data from the UDM network element.

[0186] It should be noted that the data requested by the second AMF network element to the UDM network element may be at least one of the UE's subscription information and information related to the SMF.

[0187] S711. The UDM network element receives the second request message sent by the second AMF network element, and sends the first information to the second AMF network element.

[0188] The first information also includes second information, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0189] S712. The second AMF network element receives the first information sent by the UDM network element.

[0190] S713. The second AMF network element sends a registration completion message to the UE. The registration completion message is used to indicate that the UE is registered on the second AMF network element.

[0191] S714. The UE receives a registration completion message sent by the second AMF network element.

[0192] S715. The UE sends a fourth request message to the second AMF network element. The fourth request message is used to request creation of a second session. The fourth request message includes the DNN of the second session and the hSNSSAI of the second session.

[0193] S716. The second AMF network element receives the fourth request message sent by the UE, and determines that the DNN of the first session is the same as the DNN of the second session, and the hSNSSAI of the first session is the same as the hSNSSAI of the second session.

[0194] S717. The second AMF network element creates a second session between the second AMF network element and the hSMF network element based on the identification information of the hSMF network element.

[0195] S718. The second AMF network element sends a feedback message to the UE, where the feedback message is used to indicate that the second session creation is complete.

[0196] S719. The UE receives a feedback message sent by the second AMF network element.

[0197] It can be seen that the session creation method provided in this application is also applicable to the UE roaming scenario.

[0198] Figure 9 This is a structural diagram of a session creation device provided by an embodiment. The session creation device can be configured in an AMF network element, such as Figure 9 As shown, it includes a communication module 10 and a processing module 11;

[0199] The communication module 10 is configured to obtain first information, where the first information includes identification information of the SMF network element, a data network name DNN of the first session, and single network slice selection auxiliary information SNSSAI of the first session;

[0200] The processing module 11 is configured to create a second session for the terminal device.

[0201] The session creation device provided in this embodiment is for implementing the session creation method of the above embodiment. The implementation principle and technical effects of the session creation device provided in this embodiment are similar to those of the above embodiment and will not be repeated here.

[0202] In one embodiment, the communication module 10 is configured to receive a first request message sent by a terminal device, where the first request message is used to instruct the terminal device to register on a second AMF network element; send a second request message to a unified data management (UDM) network element based on the first request message, where the second request message is used to request data from the UDM network element; and receive the first information sent by the UDM network element.

[0203] In one embodiment, the first information also includes second information, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0204] In one embodiment, the communication module 10 is further configured to receive second information sent by the UDM network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0205] In one embodiment, the communication module 10 is further configured to receive a first request message sent by a terminal device, where the first request message is used to instruct the terminal device to register on a second AMF network element; send a second request message to the UDM network element based on the first request message, where the second request message is used to request data from the UDM network element; and receive second information sent by the UDM network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0206] In one embodiment, the communication module 10 is further configured to send a third request message to the UDM network element, where the third request message is used to request subscription to the first information;

[0207] The communication module 10 is configured to receive first information sent by the UDM network element.

[0208] In one embodiment, the communication module 10 is configured to receive a fourth request message sent by a terminal device, where the fourth request message is used to request the creation of a second session; send a fifth request message to a UDM network element, where the fifth request message is used to request data from the UDM network element; and receive the first information sent by the UDM network element.

[0209] In one embodiment, the processing module 11 is configured to receive a fourth request message sent by a terminal device, where the fourth request message is used to request the creation of a second session, and the fourth request message includes the DNN of the second session and the SNSSAI of the second session; based on the DNN of the second session and the SNSSAI of the second session, a second session is created for the terminal device.

[0210] In one embodiment, the processing module 11 is configured to determine that the DNN of the first session is the same as the DNN of the second session, and the SNSSAI of the first session is the same as the SNSSAI of the second session; create a second session between the second AMF network element and the SMF network element based on the identification information of the SMF network element; and send a feedback message to the terminal device, where the feedback message is used to indicate that the creation of the second session is complete.

[0211] Figure 10 This is a structural diagram of another session creation device provided by an embodiment. The session creation device can be configured in a UDM network element, such as Figure 10 As shown, it includes a communication module 20;

[0212] The communication module 20 is configured to send first information to the second AMF, where the first information includes identification information of the SMF network element, the data network name DNN of the first session, and single network slice selection auxiliary information SNSSAI of the first session.

[0213] The session creation device provided in this embodiment is for implementing the session creation method of the above embodiment. The implementation principle and technical effects of the session creation device provided in this embodiment are similar to those of the above embodiment and will not be repeated here.

[0214] In one embodiment, the communication module 20 is further configured to receive first information sent by the SMF network element.

[0215] In one embodiment, the communication module 20 is configured to receive a second request message sent by a second AMF network element and send first information to the second AMF network element, where the second request message is used to request data from the UDM network element.

[0216] In one embodiment, the first information also includes second information, and the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0217] In one embodiment, the communication module 20 is further configured to send second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0218] In one embodiment, the communication module 20 is further configured to receive a second request message sent by a second AMF network element, where the second request message is used to request data from the UDM network element; and send second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

[0219] In one embodiment, the communication module 20 is further configured to receive a third request message sent by the second AMF network element, where the third request message is used to request subscription to the first information.

[0220] In one embodiment, the communication module 20 is further configured to receive a fifth request message sent by the second AMF network element, where the fifth request message is used to request data from the UDM network element.

[0221] Figure 11 A schematic diagram of the structure of an AMF network element provided in an embodiment is shown as follows: Figure 11 As shown, the AMF network element includes a processor 60, a memory 61 and a communication interface 62; the number of processors 60 in the AMF network element can be one or more, Figure 11 AMF network element processor 60, memory 61, communication interface 62 can be connected by bus or other means, Figure 11 The term "bus" refers to one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures.

[0222] The memory 61, as a computer-readable storage medium, can be configured to store software programs, computer executable programs, and modules, such as program instructions / modules corresponding to the method in the embodiment of the present application. The processor 60 executes at least one functional application and data processing of the AMF network element by running the software programs, instructions, and modules stored in the memory 61, that is, implements the above-mentioned session creation method.

[0223] Memory 61 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the terminal's usage. Furthermore, memory 61 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some instances, memory 61 may include memory remote from processor 60, and such remote memory may be connected to an AMF network element via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a network, a mobile communication network, and combinations thereof.

[0224] The communication interface 62 may be configured to receive and send data.

[0225] Figure 12 A schematic diagram of the structure of a UDM network element provided in an embodiment, such as Figure 12 As shown, the UDM network element includes a processor 70, a memory 71 and a communication interface 72; the number of processors 70 in the UDM network element can be one or more. Figure 12In the example of a processor 70; the processor 70, the memory 71, and the communication interface 72 in the UDM network element can be connected by a bus or other means, Figure 12 The term "bus" refers to one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures.

[0226] Memory 71, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the methods in the embodiments of the present application. Processor 70 executes the software programs, instructions, and modules stored in memory 71 to execute at least one functional application and data processing of the UDM network element, thereby implementing the above-mentioned session creation method.

[0227] Memory 71 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the terminal's usage. Furthermore, memory 71 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some instances, memory 71 may include memory remote from processor 70, and such remote memory may be connected to a UDM network element via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a network, a mobile communication network, and combinations thereof.

[0228] The communication interface 72 can be configured to receive and send data.

[0229] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method provided in any embodiment of the present application is implemented.

[0230] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. Computer-readable storage media include (a non-exhaustive list): an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0231] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, the data signal carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0232] The program code embodied on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0233] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination of multiple programming languages, including object-oriented programming languages ​​such as Java, Smalltalk, C++, Ruby, Go, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0234] It will be appreciated by those skilled in the art that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a vehicle-mounted mobile station.

[0235] In general, various embodiments of the present application may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0236] Embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

[0237] Any block diagram of a logical flow in the drawings of this application may represent program steps, or may represent interconnected logical circuits, modules and functions, or may represent a combination of program steps and logical circuits, modules and functions. A computer program may be stored on a memory. The memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical memory devices and systems (digital versatile discs DVD or CD), etc. Computer-readable media may include non-transitory storage media. A data processor may be of any type suitable for the local technical environment, such as, but not limited to, a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (FPGA) and a processor based on a multi-core processor architecture.

Claims

1. A session creation method, characterized in that: A first session exists between a first access and mobility management function AMF network element and a session management function SMF network element, and the method includes: The second AMF network element receives a first request message sent by the terminal device, where the first request message is used to instruct the terminal device to register on the second AMF network element; The second AMF network element sends a second request message to the unified data management UDM network element according to the first request message, where the second request message is used to request data from the UDM network element; The second AMF network element receives the first information sent by the UDM network element, where the first information includes identification information of the SMF network element, the data network name DNN of the first session, and single network slice selection auxiliary information SNSSAI of the first session; The second AMF network element creates a second session for the terminal device.

2. The method according to claim 1, characterized in that The first information also includes second information, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

3. The method according to claim 1, characterized in that Also includes: The second AMF network element receives second information sent by the UDM network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

4. The method according to claim 1, wherein Before the first session, the following is also included: The second AMF network element receives a first request message sent by the terminal device, where the first request message is used to instruct the terminal device to register on the second AMF network element; The second AMF network element sends a second request message to the UDM network element according to the first request message, where the second request message is used to request data from the UDM network element; The second AMF network element receives second information sent by the UDM network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

5. The method according to claim 4, characterized in that Also includes: The second AMF network element sends a third request message to the UDM network element, where the third request message is used to request subscription to the first information; The second AMF network element obtains the first information, including: The second AMF network element receives the first information sent by the UDM network element.

6. The method according to claim 4, characterized in that The second AMF network element obtains the first information, including: The second AMF network element receives a fourth request message sent by the terminal device, where the fourth request message is used to request creation of a second session; The second AMF network element sends a fifth request message to the UDM network element, where the fifth request message is used to request data from the UDM network element; The second AMF network element receives the first information sent by the UDM network element.

7. The method according to claim 1, characterized in that The second AMF network element creates a second session for the terminal device, including: The second AMF network element receives a fourth request message sent by the terminal device, where the fourth request message is used to request creation of a second session, and the fourth request message includes the DNN of the second session and the SNSSAI of the second session; The second AMF network element creates the second session for the terminal device based on the DNN of the second session and the SNSSAI of the second session.

8. The method according to claim 7, characterized in that The second AMF network element creates the second session for the terminal device according to the DNN of the second session and the SNSSAI of the second session, including: The second AMF network element determines that the DNN of the first session and the DNN of the second session are the same, and the SNSSAI of the first session and the SNSSAI of the second session are the same; The second AMF network element creates the second session between the second AMF network element and the SMF network element according to the identification information of the SMF network element; The second AMF network element sends a feedback message to the terminal device, where the feedback message is used to indicate that the creation of the second session is complete.

9. A method for establishing a session, characterized in that: A first session exists between a first access and mobility management function AMF network element and a session management function SMF network element, and the method includes: The unified data management UDM network element receives a second request message sent by the second AMF network element and sends first information to the second AMF network element. The second request message is used to request data from the UDM network element. The first information includes the identification information of the SMF network element, the data network name DNN of the first session, and the single network slice selection auxiliary information SNSSAI of the first session.

10. The method according to claim 9, characterized in that Also includes: The UDM network element receives the first information sent by the SMF network element.

11. The method according to claim 9, characterized in that The first information also includes second information, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

12. The method according to claim 9, characterized in that Also includes: The UDM network element sends second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

13. The method according to claim 9, characterized in that Before the first session, the following is also included: The UDM network element receives a second request message sent by the second AMF network element, where the second request message is used to request data from the UDM network element; The UDM network element sends second information to the second AMF network element, where the second information is used to indicate that at least two sessions with the same DNN and the same SNSSAI use the same SMF network element.

14. The method according to claim 13, characterized in that Also includes: The UDM network element receives a third request message sent by the second AMF network element, where the third request message is used to request subscription to the first information.

15. The method according to claim 13, characterized in that Before the UDM network element sends the first information to the second AMF, the method further includes: The UDM network element receives a fifth request message sent by the second AMF network element, where the fifth request message is used to request data from the UDM network element.

16. An access and mobility management function (AMF) network element, characterized in that: include: A processor, wherein the processor is configured to implement the session creation method according to any one of claims 1 to 8 when executing a computer program.

17. A unified data management (UDM) network element, characterized in that: include: A processor, wherein the processor is configured to implement the session creation method according to any one of claims 9 to 15 when executing a computer program.

18. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the session creation method according to any one of claims 1 to 15 is implemented.

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