CN117479268A - Allowed NSSAI acquisition methods, terminals and network-side devices - Google Patents

Abstract

This application discloses a method, terminal and network side device for obtaining allowed NSSAI, which belongs to the field of wireless communications. The method for obtaining allowed network slice selection auxiliary information in the embodiment of this application includes: the terminal sends the first network slice selection auxiliary information to the first network element. A registration request, wherein the first registration request carries the NSSAI requested by the terminal; after successfully registering to the network, the terminal receives the first information sent by the first network element; wherein the third One piece of information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI for on-demand registration, and the first identification information is used to indicate the allowed NSSAI for on-demand registration.

Description

Allowed NSSAI acquisition methods, terminals and network-side devices

Technical field

The present application belongs to the field of wireless communication technology, and specifically relates to a method for obtaining allowed Network Slice Selection Assistance Information (NSSAI), a terminal and a network side device.

Background technique

In related technologies, when a terminal accesses the network, it carries the requested NSSAI (Requested NSSAI). After receiving the request from the terminal, the network side returns the allowed NSSAI (Allowed NSSAI).

In related technologies, the network side statically configures access control information and session control information for the terminal. When the terminal initiates a registration request and a session request, it needs to determine multi-dimensional restriction information and finally select RequestedNSSAI for registration as needed. That is to say, the terminal needs to identify the service attributes when it is powered on and register, and determine the single network slice selection auxiliary information (Single network slice selection auxiliary information, S-NSSAI) list contained in the Request NSSAI under different regional scopes and different service requirements ( list). Therefore, in related technologies, there is a strong reliance on the terminal to identify different network slice service types and requirements. The terminal is required to identify on-demand registration slices and perform corresponding operations when registering, and the terminal processes the information obtained from the network side in the above operations, which is complex. The requirements for the terminal are relatively high, which increases the complexity of the terminal.

Contents of the invention

Embodiments of the present application provide a permitted NSSAI acquisition method, terminal and network-side device, which can solve the problem in related technologies that relies heavily on the terminal to identify different network slicing service types and requirements for the terminal.

In a first aspect, a method for obtaining allowed network slice selection assistance information is provided, including: a terminal sending a first registration request to a first network element, wherein the first registration request carries the NSSAI requested by the terminal. ; After successfully registering to the network, the terminal receives the first information sent by the first network element; wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: On-demand registration NSSAI, the first identification information is used to indicate the allowed on-demand registration NSSAI.

In a second aspect, a device for obtaining allowed network slice selection auxiliary information is provided, including: a first sending module, configured to send a first registration request to the first network element, wherein the first registration request carries NSSAI requested by the terminal; a first receiving module, configured to receive the first information sent by the first network element; wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include : On-demand registration NSSAI, the first identification information is used to indicate the allowed on-demand registration NSSAI.

In a third aspect, a method for obtaining allowed network slice selection auxiliary information is provided, including: a first network element receiving a first registration request sent by a terminal, wherein the first registration request carries the information requested by the terminal. NSSAI; the first network element determines at least one allowed NSSAI corresponding to the terminal based on the first target information; the first network element sends first information to the terminal, wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI includes NSSAI in the at least one allowed NSSAI except the NSSAI corresponding to the network slice registered on demand, and the first identification information is used to indicate that the at least one allowed NSSAI An on-demand registered NSSAI within an allowed NSSAI.

In a fourth aspect, a device for obtaining allowed network slice selection assistance information is provided, including: a second receiving module configured to receive a first registration request sent by a terminal, wherein the first registration request carries the NSSAI requested by the terminal; a second determination module, configured to determine at least one allowed NSSAI corresponding to the terminal based on the first target information; a second sending module, configured to send the first information to the terminal, wherein the The first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI includes NSSAI in the at least one allowed NSSAI except the NSSAI corresponding to the network slice registered on demand, and the first identification information is NSSAI indicating on-demand registration among the at least one allowed NSSAI.

In a fifth aspect, a method for obtaining a control policy is provided, including: the first network element sending a first request to a second network element, wherein the first request is used for a network control policy corresponding to terminal behavior information, The first request carries the terminal behavior information; the first network element receives at least one network control policy sent by the second network element, wherein the network control policy includes S-NSSAI and registration Correspondence between timers.

In a sixth aspect, a device for obtaining a control policy is provided, including: a third sending module configured to send a first request to a second network element, wherein the first request is used for a network control policy corresponding to terminal behavior information , the first request carries the terminal behavior information; a third receiving module is used to receive at least one network control policy sent by the second network element, wherein the network control policy includes S-NSSAI Correspondence with registration timer.

In a seventh aspect, a method for sending a control policy is provided, including: a second network element receiving a first request sent by a first network element, wherein the first request is used for a network control policy corresponding to terminal behavior information of a terminal ; The second network element determines at least one network control strategy based on the second target information, wherein the network control strategy includes the corresponding relationship between S-NSSAI and the registration timer; the second network element reports to the The first network element sends the at least one network control policy.

In an eighth aspect, a device for sending a control policy is provided, including: a fourth receiving module configured to receive a first request sent by a first network element, wherein the first request is used for terminal behavior information of a corresponding terminal. Network control strategy; the third determination module is used to determine at least one network control strategy according to the second target information, wherein the network control strategy includes the corresponding relationship between S-NSSAI and the registration timer; the fourth sending module, Used to send the at least one network control policy to the first network element.

In a ninth aspect, a method for controlling a PDU session is provided, including: a third network element receiving a PDU session establishment request sent by a terminal, the PDU session establishment request being used to request the establishment of a second PDU session; the third network element Send a second request to the second network element, where the second request is used for a session control policy corresponding to the terminal behavior information of the terminal; the third network element receives at least one item sent by the second network element Session control policy, wherein the session control policy includes the corresponding relationship between S-NSSAI and session timer; after determining that the second PDU session is established, the third network element starts a session corresponding to the second S-NSSAI The first session timer, the second S-NSSAI is the S-NSSAI corresponding to the second PDU session; when the first session timer times out, the third network element releases the third Two PDU sessions, wherein the first session timer is suspended when the user plane function UPF connection corresponding to the second PDU session is active or a new UPF connection corresponding to the second PDU session is established. , when the UPF connection corresponding to the second PDU session is released, the first session timer counts.

In a tenth aspect, a control device for a PDU session is provided, including: a fifth receiving module, configured to receive a PDU session establishment request sent by a terminal, where the PDU session establishment request is used to request the establishment of a second PDU session; a fifth sending module A module configured to send a second request to a second network element, where the second request is used for a session control policy corresponding to terminal behavior information of the terminal; the fifth receiving module is further configured to receive the third At least one session control policy sent by the two network elements, wherein the session control policy includes the corresponding relationship between S-NSSAI and session timer; the second control module is used to: after determining that the second PDU session is established , start the first session timer corresponding to the second S-NSSAI, and the second S-NSSAI is the S-NSSAI corresponding to the second PDU session; when the first session timer times out, Release the second PDU session, wherein when the user plane function UPF connection corresponding to the second PDU session is in an active state or a new UPF connection corresponding to the second PDU session is established, the first The session timer is suspended, and when the UPF connection corresponding to the second PDU session is released, the first session timer counts.

In an eleventh aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following is implemented: The steps of the method described in the first aspect.

In a twelfth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the first aspect, and the communication interface is used to communicate with an external device.

In a thirteenth aspect, a network side device is provided. The network side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are used by the processor. When executed, the steps of the method described in the third aspect, or the steps of the method described in the fifth aspect, or the steps of the method described in the seventh aspect, or the method described in the ninth aspect are realized. A step of.

In a fourteenth aspect, a network side device is provided, including a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the third aspect, or to implement the method described in the fifth aspect. The communication interface is used to communicate with an external device.

In a fifteenth aspect, a system for obtaining allowed network slice selection auxiliary information is provided, including: a terminal and a network side device. The terminal can be used to perform the steps of the method described in the first aspect. The network side device Can be used to perform the steps of the method described in the third aspect, or implement the steps of the method described in the fifth aspect, or implement the steps of the method described in the seventh aspect, or implement the method described in the ninth aspect A step of.

In a sixteenth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented. The steps of the method described in the third aspect, or the steps of implementing the method described in the fifth aspect, or the steps of the method described in the seventh aspect, or the steps of the method described in the ninth aspect.

In a seventeenth aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. The steps of the method, or the steps of realizing the method as described in the third aspect, or the steps of realizing the method as described in the fifth aspect, or the steps of realizing the method as described in the seventh aspect, or the steps of realizing the method as described in the ninth aspect steps of the method described.

In an eighteenth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement as described in the first aspect The steps of the method, or the steps of realizing the method described in the third aspect, or the steps of realizing the method described in the fifth aspect, or the steps of realizing the method described in the seventh aspect, or realizing the steps of the ninth aspect steps of the method.

In the embodiment of this application, when the terminal initiates registration, it only needs to carry the NSSAI requested by the terminal. The network side identifies the NSSAI allowed by the terminal and the NSSAI registered on demand among the NSSAI allowed by the terminal, thereby returning the allowed NSSAI and The first identification information. The returned allowed NSSAI does not include the NSSAI for on-demand registration, but indicates the allowed NSSAI for on-demand registration through the first identification information, so that the terminal can learn the NSSAI for on-demand registration without the need for the terminal to identify different Network slicing service types and requirements reduce the requirements for terminals.

Description of the drawings

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable;

Figure 2a shows a schematic flowchart of a method for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application;

Figure 2b shows another schematic flowchart of a method for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application;

Figure 3 shows a schematic flowchart of a method for obtaining a control policy provided by an embodiment of the application;

Figure 4 shows a schematic flowchart of a method for sending a control policy provided by an embodiment of the present application;

Figure 5 shows a schematic flow chart of the PDU session control method provided by the embodiment of the present application;

Figure 6 shows another schematic flow chart of the PDU session control method provided by the embodiment of the present application;

Figure 7 shows a schematic flow chart of a policy update method in an embodiment of the present application;

Figure 8 shows a schematic flow chart of another policy update method in the embodiment of the present application;

Figure 9 shows a schematic structural diagram of a device for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application;

Figure 10 shows another structural schematic diagram of an apparatus for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application;

Figure 11 shows a schematic structural diagram of a device for obtaining a control strategy provided by an embodiment of the present application;

Figure 12 shows a schematic structural diagram of a control strategy sending device provided by an embodiment of the present application;

Figure 13 shows a schematic structural diagram of a PDU session control device provided by an embodiment of the present application;

Figure 14 shows a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 15 shows a schematic diagram of the hardware structure of a terminal provided by an embodiment of the present application;

Figure 16 shows a schematic diagram of the hardware structure of a network-side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

It is worth pointing out that the technology described in the embodiments of this application is not limited to Long Term Evolution (Long Term Evolution, LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) , Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these techniques can also be applied to applications other than NR system applications, such as ^6th Generation , 6G) communication system.

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer ( ultra-mobile personalcomputer (UMPC), mobile Internet Device (MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (WearableDevice), vehicle-mounted equipment ( VUE), pedestrian terminal (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (PC), teller machines or self-service machines and other terminal sides Equipment, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, Smart clothing, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network side device 12 may include an access network device and/or a core network device, where the access network device 12 may also be called a radio access network device, a radio access network (Radio Access Network, RAN), or a radio access network. function or radio access network unit. The access network device 12 may include a base station, a WLAN access point or a WiFi node, etc. The base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (BTS), a radio Base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B, Home Evolved Node B, Transmitting Receiving Point (TRP) or in the above mentioned fields Other suitable terms can be used as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only the base station in the NR system is used as an example for introduction, and the base station is not limited. specific type. Core network equipment may include but is not limited to at least one of the following: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions ( Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Service Discovery Function (EdgeApplicationServerDiscoveryFunction, EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC) , Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (LocalNEF, or L-NEF), Binding Support Function (BSF), Application Function (AF )wait. Among them, PCF may include access management PCF (Access Management PCF, AM-PCF) and session management PCF (Session Management PCF, SM-PCF). It should be noted that in the embodiment of this application, only the core network equipment in the NR system is used as an example for introduction, and the specific type of the core network equipment is not limited.

The allowed network slice selection auxiliary information acquisition scheme provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios.

Figure 2a shows a schematic flowchart of a method for obtaining allowed network slice selection assistance information in an embodiment of the present application. The method 200a can be executed by a terminal. In other words, the method may be performed by software or hardware installed on the terminal. As shown in Figure 2a, the method may include the following steps.

S210: The terminal sends a first registration request to the first network element, where the first registration request carries the NSSAI requested by the terminal.

In this embodiment of the present application, the first registration request can be used to register the network slice corresponding to the normal service, but not to register the network slice registered on demand. That is to say, in the embodiment of the present application, the terminal does not need to distinguish the service requirements of different network slices during initial registration to register only the network slice corresponding to the normal service, and for the network slice registered on demand (only when there is (Initiate registration and session requests when the session is repaired) Do not register temporarily, and ensure that the network slice registered on demand will not be rejected. Subsequent registration and session requests can be flexibly initiated according to business needs.

In this embodiment of the present application, the first registration request may be a request for the terminal to access the network. For example, the first registration request may be an attach request (Attach Request) or a registration request (Registration Request) to register to the network.

In this embodiment of the present application, the first network element may include an AMF.

In a possible implementation, the first registration request may also carry first indication information indicating that the terminal behavior is supported. For example, if the terminal itself has requirements for power saving, customized access, etc., the terminal may indicate the terminal requirements through the first indication information.

In S210, the requested NSSAI carried in the first registration request is requested by the terminal according to the normal business process, without the terminal needing to identify which services perform on-demand registration and session processes. For example, the requested NSSAI carried in the first registration request may be the NSSAI configured in the current Public Land Mobile Network (Public Land Mobile Network, PLMN).

S212: The terminal receives the first information sent by the first network element.

Wherein, the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI for on-demand registration, and the first identification information is used to indicate the allowed NSSAI for on-demand registration.

Among them, Allowed NSSAI is used to indicate the S-NSSAIs values the UE could use in the Serving PLMN in the current Registration Area.

When the first registration request is an attach request or a registration request to register to the network, the first network element, after receiving the first registration request from the terminal, can execute the normal registration process, together with the authentication service function (Authentication Server Function, AUSF) and UDM, etc. interact to complete the registration process. In addition, the first network element can determine the value of the NSSAI allowed by the terminal. For network slices registered on demand, this NSSAI will not be added to the returned allowed NSSAI, and there will be no rejected NSSAI in the returned allowed NSSAI. (Rejected NSSAI). In addition, the first network element may also return a first identifier to indicate the allowed on-demand registered NSSAI. Therefore, the first identifier may also be called an on-demand allowed (On-demand Allowed) NSSAI. logo.

In the embodiment of this application, when the terminal initiates registration, it only needs to carry the NSSAI requested by the terminal. The network side identifies the NSSAI allowed by the terminal and the NSSAI registered on demand among the NSSAI allowed by the terminal, thereby returning the allowed NSSAI and The first identification information. The returned allowed NSSAI does not include the NSSAI for on-demand registration, but indicates the allowed NSSAI for on-demand registration through the first identification information, so that the terminal can learn the NSSAI for on-demand registration without the need for the terminal to identify different Network slicing service types and requirements reduce the load on terminals and reduce requirements on terminals.

In a possible implementation, after the terminal receives the first information sent by the network side device, the method may further include the following steps:

Step 1: Based on the user equipment routing option policy (UE Route Selection Policy, URSP) rules, the terminal obtains the single network slice selection auxiliary information (Single Network) corresponding to the protocol data unit (Protocol Data Unit, PDU) session that transmits the service to be transmitted. Slice Selection AssistanceInformation, S-NSSAI).

For example, after the terminal matches the traffic of an application based on URSP rules, it obtains the matching traffic descriptor. The traffic descriptor describes a set of attributes of the PDU session (that is, the attributes of the PDU session that transmits the service to be transmitted). This set of attributes It generally includes information such as S-NSSAI, data network name (DNN), and access type. The S-NSSAI corresponding to the PDU session in step 1 is the S-NSSAI in the attributes of the PDU session determined based on the URSP rules.

Step 2: Determine that the S-NSSAI corresponding to the PDU session matches an allowed on-demand registration NSSAI indicated by the first identification information.

In this step, the terminal discovers that the S-NSSAI corresponding to the PDU session is an allowed on-demand registration NSSAI.

Step 3: The terminal sends a second registration request, where the second registration request is used to request registration to the network slice corresponding to the S-NSSAI.

Since the S-NSSAI corresponding to the PDU session is an NSSAI registered on demand, before establishing the PDU session, the terminal sends a second registration request to request registration to the network slice corresponding to the S-NSSAI.

Step 4: After receiving the registration success response, the terminal sends a PDU session establishment request, where the PDU session establishment request is used to request the establishment of the PDU session.

In response to the needs of diversified services, when a terminal signs a contract at the same time and can obtain multiple network slice services, for the purpose of power saving or differentiated operation and maintenance, some network slices may require the terminal to not need to register when there is no session request. In network slicing, registration and PDU session requests are only initiated when there is a session requirement. Through the above possible implementation, the terminal can only register to the NSSAI when it needs to establish a PDU session corresponding to the NSSAI registered on demand. This can reduce the unnecessary registration process of the terminal and meet the needs of power saving or differentiated operation and maintenance.

Figure 2b shows another schematic flowchart of a method for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application. As shown in Figure 2b, the method 200b mainly includes the following steps.

S220. The first network element receives the first registration request sent by the terminal, where the first registration request carries the NSSAI requested by the terminal.

The first registration request is the same as the first registration request in method 200. For details, please refer to the description in method 200.

In this embodiment of the present application, the first network element may include an AMF.

S222: The first network element determines at least one allowed NSSAI corresponding to the terminal based on the first target information.

In a possible implementation, the first target information includes but is not limited to at least one of the following:

(1) Operator side policy; for example, the operator side specifies the terminal types applicable to each network slice, etc., and can determine the allowed NSSAI corresponding to the terminal.

(2) Location information of the terminal. Different network slices may be applicable to different location ranges. Therefore, the allowed NSSAI corresponding to the terminal's current location can be determined based on the location information of the terminal.

(3) User subscription information of the terminal. For example, some special network slices may require the terminal to subscribe to certain special services before they can be used. Therefore, based on the user subscription information of the terminal, the allowed NSSAI corresponding to the user subscription information of the terminal can be obtained.

(4) The load condition of network slicing. In order to balance the load of various network slices, some network slices with higher load can be excluded from the allowed NSSAI of the terminal.

Through the above possible implementation methods,

S224: The first network element sends first information to the terminal, where the first information includes allowed NSSAI and first identification information, where the allowed NSSAI includes the at least one allowed NSSAI except NSSAI other than the NSSAI registered on demand, the first identification information is used to indicate the NSSAI registered on demand among the at least one allowed NSSAI.

In this embodiment of the present application, the first network element determines at least one allowed NSSAI corresponding to the terminal, returns the NSSAI other than the NSSAI registered on demand to the terminal, and indicates the at least one allowed NSSAI through the first identification information. The on-demand registration of NSSAI in NSSAI allows the terminal to register only the network slices corresponding to normal services without distinguishing the business needs of different network slices during initial registration. For on-demand registration network slices (only when there are (Initiate registration and session requests when the session is repaired) Do not register temporarily, and ensure that the network slice registered on demand will not be rejected. Subsequent registration and session requests can be flexibly initiated according to business needs.

Figure 3 shows a schematic flowchart of a control policy acquisition method provided by an embodiment of the present application. As shown in Figure 3, the method 300 mainly includes the following steps.

S310: The first network element sends a first request to the second network element, where the first request is used for the network control policy corresponding to the terminal behavior information of the terminal, and the first registration request carries the terminal behavioral information.

In this embodiment of the present application, the second network element may include PCF, or if the PCF includes AM-PCF and SM-PCF, the second network element may include AM-PCF.

The terminal behavior information may include one or more of the terminal's power saving requirements, customized access requirements, etc.

The first network element may send the first request to the second network element when the terminal initially registers, for example, after the terminal successfully registers to the network slice for the first time. For example, the first network element may send the first registration request after receiving the first registration request in methods 200a and 200b and after the terminal successfully registers with the network.

S312: The first network element receives at least one network control policy sent by the second network element, where the network control policy includes the corresponding relationship between S-NSSAI and registration timer.

Through this possible implementation, the first network element can obtain the network control policy from the second network element, so that the first network element can control the registration duration according to the network control policy to save resources.

In a possible implementation, the method may further include the following steps:

Step 1: The first network element executes a registration process for the terminal to register in the first network slice corresponding to the first S-NSSAI.

Optionally, the first S-NSSAI may be an NSSAI corresponding to a normal business process, for example, an allowed (allowed) NSSAI included in the first information in methods 200a and 200b, or may be an on-demand registration (on- demand), for example, the NSSAI identified by the first identification information contained in the first information in methods 200a and 200b.

In step 1, the first network element may register the terminal with the first network slice corresponding to the first S-NSSAI after receiving a registration request initiated by the terminal to register with the first network slice corresponding to the first S-NSSAI. Registration process in the first network slice. For example, after successfully registering with the network, the terminal obtains the first S-NSSAI corresponding to the PDU session that transmits the service to be transmitted based on the URSP rules, and determines that the first NSSAI is the NSSAI registered on demand based on the first identification information. , then a second registration request is sent. The second registration request is used to request registration to the first network slice corresponding to the first S-NSSAI. After receiving the second registration request, the first network element executes the terminal Registration process in the first network slice corresponding to the first S-NSSAI. Of course, it is not limited to this. The first network element may perform registration of the terminal with the first S-NSSAI after receiving a registration request from the terminal to the first network slice other than the on-demand registration network slice. The corresponding registration process in the first network slice.

Step 1 may be performed after S312 or before S310. For example, the terminal registering to the first network slice corresponding to the first S-NSSAI may be the first time the terminal registers to the network slice. The step may be to perform S310 after the terminal successfully registers with the first network slice.

Step 2: When the terminal successfully registers with the first network slice, the first network element starts the first registration corresponding to the first S-NSSAI according to the at least one network control policy. timer.

Step 3: If the PDU session establishment request of the first PDU session corresponding to the first S-NSSAI is not received before the first registration timer expires, the first network element executes the terminal operation. The deregistration process of the first network slice. Through the deregistration process, the terminal's registration in the first network slice can be deregistered, and the terminal is in an unregistered state in the first network slice again.

In the above possible implementation manner, the first network element performs monitoring of the registration duration according to the at least one network control policy. After the terminal registers to the network slice corresponding to the first S-NSSAI, if no targeting is initiated within a certain period of time, The establishment process of the first PDU session corresponding to the S-NSSAI triggers the deregistration process of the terminal in the network slice corresponding to the first S-NSSAI, and deregisters the terminal in the network slice corresponding to the first S-NSSAI to save resources. .

In a possible implementation, the network control policy may also include a corresponding relationship between the S-NSSAI and the session timer. For example, when only one type of PCF is deployed on the network side, the PCF can decide the corresponding relationship between S-NSSAI and the registration timer (Reg_Timer) and the corresponding relationship between the S-NSSAI and the session timer (PDU_Timer). That is, the PCF can Determine access control policies and session control policies.

In a possible implementation, after the first network element receives at least one network control policy sent by the second network element, the method may further include the following steps:

Step 1: The first network element receives a PDU session establishment request initiated by the terminal, where the PDU session establishment request is used to request the establishment of a second PDU session corresponding to the second S-NSSAI.

For example, before the registration timer corresponding to the second S-NSSAI expires, the first network element receives a PDU session establishment request initiated by the terminal. The PDU session establishment request is used to request the establishment of a second session corresponding to the second S-NSSAI. PDU session.

Step 2: After determining that the second PDU session is successfully established, the first network element starts the first session timer corresponding to the second S-NSSAI.

Step 3: When the first session timer times out, the first network element releases the second PDU session, wherein the UPF connection corresponding to the second PDU session is active or established with the In the case of a new UPF connection corresponding to the second PDU session, the first session timer is suspended; in the case of a UPF connection corresponding to the second PDU session being released, the first session timer counts.

Through the above possible implementation manner, the first network element can control the session duration, and when the first session timer corresponding to the second S-NSSAI times out, release the second PDU session to save PDU session resources.

In a possible implementation, after the first network element receives at least one network control policy sent by the second network element, the method may further include the following steps:

Step 1: The first network element receives a session release message sent by a third network element, where the session release message is used to indicate releasing the second PDU session.

Among them, the third network element may be SMF.

For example, in the case where the PCF includes AM-PCF and SM-PCF, the AM-PCF sends the network control policy to the first network element, and the SMF sends a PDU session establishment request to the SM after receiving the PDU session establishment request requesting to establish the second PDU session. -PCF sends a policy acquisition request to obtain the session control policy from SM-PCF. After the second PDU session establishment request, SMF determines to release the second PDU session according to the session control policy, and then initiates the release process of the second PDU session and sends the request to the second PDU session. A network element sends the session release message.

Step 2: The first network element releases the second PDU session. The first network element releases the second PDU session based on the session release message.

In one or more possible implementations, after releasing the second PDU session, the method may further include: the first network element starting a second registration timer corresponding to the second S-NSSAI, and If the PDU session establishment request corresponding to the second S-NSSAI is not received before the second registration timer expires, the first network element executes the terminal operation corresponding to the second S-NSSAI. The deregistration process of the second network slice, wherein the second S-NSSAI corresponds to the second PDU session. In this possible implementation, after releasing the second PDU session, the first network element starts the second registration timer corresponding to the second S-NSSAI, and monitors the registration time for the terminal to register to the second S-NSSAI. If the PDU session establishment request corresponding to the second S-NSSAI is not received before the second registration timer times out, the deregistration process of the terminal in the second network slice may be triggered to save resources.

In one or more possible implementations, after the first network element receives at least one network control policy sent by the second network element, the method may further include the following steps:

Step 1: The first network element receives the updated at least one network control policy sent by the second network element;

Step 2: The first network element saves and uses the updated at least one network control policy.

Through the above possible implementation methods, the second network element can update the network control strategy and send the updated network control strategy to the first network element for use, thereby avoiding network control decisions caused by changes in the network environment and other factors. When the strategy is not applicable, differentiated business strategies can be implemented.

Figure 4 shows a schematic flowchart of a control policy sending method provided by an embodiment of the present application. As shown in Figure 4, the method 400 mainly includes the following steps.

S410. The second network element receives the first request sent by the first network element, where the first request is used for the network control policy corresponding to the terminal behavior information of the terminal.

The first network element may send the first request as described in method 300.

In this embodiment of the present application, the second network element may be a PCF. For example, the PCF may include AM-PCF and SM-PCF.

S412: The second network element determines at least one network control policy based on the second target information, where the network control policy includes a corresponding relationship between the S-NSSAI and the registration timer.

In a possible implementation of the embodiment of this application, the second target information includes at least one of the following:

(1) User subscription information of the terminal; for example, the user can sign a contract in advance. For a certain type of service, the terminal can be deregistered after the terminal does not perform transmission of the service for a certain period of time.

(2) Location information of the terminal; for example, for network slices of certain service types registered by the terminal, the terminal may not transmit the service for a long time in certain locations. Therefore, when the terminal is located in these locations, the terminal may After a certain period of time without performing the transmission of this service, the terminal will be deregistered.

(3) External application of AF; wherein, the external application of AF may include the corresponding application server and application information external to AF. For example, in the case of a game server, the game provider will inform the operator of the access strategy when signing a contract with the operator network. For example, in order to meet the usage rate of the game server, the user can be deregistered after the user does not use the game for more than a certain period of time.

(4) The load condition of network slicing. For example, when the load of a network slice exceeds a certain threshold, in order to allow other terminals to obtain the services provided by the network slice, the terminal can be deregistered after the user has not performed service transmission corresponding to the network slice for a long time.

S414: The second network element sends the at least one network control policy to the first network element.

In a possible implementation, the network control policy further includes a correspondence between S-NSSAI and session timers. For example, when PCF does not distinguish between AM-PCF and SM-PCF and only one type of PCF is deployed in the network, the second network element can provide S-NSSAI to the first network element at the same time after receiving the first request. Corresponding registration timer and session timer.

In a possible implementation, after the second network element sends the at least one network control policy to the first network element, the method may further include the following steps:

Step 1: The second network element determines to update the at least one network control policy;

Step 2: The second network element obtains at least one updated network control policy;

Step 3: The second network element sends the updated at least one network control policy to the first network element. Wherein, the network control policy includes an identification list of on-demand network slices (one or more S-NSSAI) and a corresponding control duration Reg_Timer.

Wherein, optionally, the second network element may determine to update the at least one network control policy under at least one of the following conditions:

(1) The second network element receives the trigger information of the external AF, and the trigger information is used to indicate updating the at least one network control policy; for example, the game company can negotiate with the operator to update the network control policy, for example, Update the corresponding relationship between the registration timer and S-NSSAI, that is, update the control duration corresponding to one or more S-NSSAI.

(2) The second network element receives a notification from the UDR, and the notification indicates that the subscription information of the terminal has changed. For example, for a certain type of service, the terminal may update its subscription information.

(3) The second network element obtains analysis information from NWDAF. Among them, the second network element can obtain the analysis information obtained by NWDAF by evaluating and calculating the current and historical network operating status, and based on the analysis information, determine that the network control policy needs to be updated.

Through the above possible implementation methods, the second network element can update the network control strategy, so that different network control strategies can be formulated according to different situations.

In another possible implementation, after the second network element sends the at least one network control policy to the first network element, the method may further include the following steps:

Step 1: The second network element receives a second request sent by a third network element, where the second request is used for a session control policy corresponding to the terminal behavior information.

Among them, the third network element may be SMF. For example, in the case where the PCF includes AM-PCF and SM-PCF, AM-PCF sends a network control policy to the first network element, and SMF sends a PDU session establishment request to the first network element after receiving a PDU session establishment request requesting to establish a second PDU session. SM-PCF sends a second request to request the session control policy corresponding to the terminal behavior information.

Step 2: The second network element determines at least one session control policy based on the second target information, where the session control policy includes the corresponding relationship between S-NSSAI and session timer.

For example, the second network element may determine the at least one session control policy based on at least one of the user subscription information of the terminal, the location information of the terminal, the external application of the AF, and the load condition of the network slice.

Step 3: The second network element sends the at least one session control policy to the third network element.

The second network element sends at least one session control policy to the third network element, and the third network element controls the session duration of the terminal based on the at least one session control policy,

In a possible implementation, after the second network element sends the at least one session control policy to the third network element, the method may further include at least one of the following:

Step 1: The second network element determines to update the at least one session control policy;

Step 2: The second network element obtains at least one updated session control policy;

Step 3: The second network element sends the updated at least one session control policy to the third network element. The session control policy includes an identification list of on-demand network slices (one or more S-NSSAI) and the corresponding session control duration PDU_Timer.

Optionally, the second network element may determine to update the at least one session control policy under at least one of the following conditions:

(1) The second network element receives trigger information from the external AF, where the trigger information is used to indicate updating the at least one session control policy;

(2) The second network element receives a notification from the unified data warehousing UDR, and the notification indicates that the subscription information of the terminal has changed;

(3) The second network element obtains analysis information from the network data analysis function NWDAF.

Through the above possible implementation manner, the second network element can update the session control policy, so that different session control policies can be formulated according to different situations.

Figure 5 shows a schematic flowchart of a PDU session control method provided by an embodiment of the present application. As shown in Figure 5, the method 500 mainly includes the following steps.

S510. The third network element receives a PDU session establishment request sent by the terminal, where the PDU session establishment request is used to request the establishment of a second PDU session.

For example, the terminal can initiate a PDU session establishment request. The PDU session establishment request can carry terminal behavior information, such as the terminal's power saving requirements, the terminal's customized access requirements, etc. After completing the session SMF selection, the third network element (for example, SMF) receives the PDU session establishment request sent by the terminal.

S512. The third network element sends a second request to the second network element, where the second request is used for the session control policy corresponding to the terminal behavior information of the terminal;

For example, the third network element may send the second request to the second network element in the policy process.

S514: The third network element receives at least one session control policy sent by the second network element, where the session control policy includes the corresponding relationship between S-NSSAI and session timer.

The second network element may obtain and send the at least one session control policy in the manner described in the above method 400. For details, please refer to the relevant description in the method 400, which will not be described again here.

S516: After determining that the second PDU session is established, the third network element starts the first session timer corresponding to the second S-NSSAI, and the second S-NSSAI is corresponding to the second PDU session. S-NSSAI;

S518: When the first session timer times out, the third network element releases the second PDU session, wherein the UPF connection corresponding to the second PDU session is active or established with the second PDU session. In the case of a new UPF connection corresponding to the second PDU session, the first session timer is suspended. When the UPF connection corresponding to the second PDU session is released, the first session timer counts.

Through the above method provided by the embodiments of this application, the third network element can control the duration of the PDU session based on the session control policy to save resources.

In a possible implementation, after the third network element releases the second PDU session, the method further includes: the third network element sends a session release message to the first network element, wherein: The session release message is used to indicate releasing the second PDU session. Through this possible implementation, after the third network element releases the second PDU session, the first network element is notified, so that the first network element can learn that the second PDU session is released and start the second S corresponding to the second PDU session. -NSSAI registration timer. If the terminal does not receive a request from the terminal to initiate a PDU session corresponding to the second S-NSSAI before the registration timer of the second S-NSSAI expires, the terminal is triggered to respond to the second S-NSSAI. The deregistration process of the network slice.

Figure 6 shows another schematic flow chart of the PDU session control method provided by the embodiment of the present application. As shown in Figure 6, the method mainly includes the following steps:

Step 601: The UE initiates a registration request.

Optionally, if the UE itself has requirements such as power saving and customized access, the network can be required to provide request information of the UE Behavior policy to the AMF.

Among them, the Request NSSAI initiated by the UE here is requested according to the normal business process, and there is no need to identify which services require on-demand registration and session processes.

Among them, if the UE does not carry UE behavior information, then whether to distribute the corresponding policy is completely determined by the network, for example, based on PLMN, subscription, network load, service characteristics, etc.

Step 602: AMF performs the normal registration process and the interactive registration process with AUSF and UDM. If you need to perform network slice reselection, you need to interact with NSSF and so on. Here, AMF determines the value of Allowed NSSAI based on operator policy, terminal current location information, user subscription, current network slice load, etc. For network slices registered on demand, this NSSAI is not added to the returned Allowed NSSAI, but Similarly, it does not exist in Rejected NSSAI, and a new On-demand Allowed NSSAI flag is added and finally passed to the terminal.

When the terminal subsequently has a business request for PDU session connection, it matches the URSP. When the S-NSSAI corresponding to the matching PDU session is consistent with the On-demand Allowed NSSAI, the terminal first initiates registration and then initiates a PDU Sessionrequest. For normal Allowed NSSAI, the normal process is executed. In this case, the UE does not need to perform too many operations to perform corresponding registration request differentiation, reducing the load of the UE. In addition, the modification of the network policy is more flexible and can focus on multiple aspects. Factors such as load, tracking area (TA) information, external policies, etc.

Steps 603-605: AMF initiates an Npcf_AMPlicyControl_Create Request to PCF/AM-PCF, requesting the response strategy supported by the corresponding UE Behavior. PCF determines one or more of the following conditions based on the terminal's contract, AF external application, terminal's current location, network current load, etc. Customize the network control strategy, return the registration management timer (Reg_Timer) and the corresponding S-NSSAI, so that AMF can perform access control on the responding S-NSSAI.

Step 606, the rest of the registration process is completed.

Step 607: After receiving the Reg_Timer, the AMF monitors the current registration status of the corresponding S-NSSAI. If the AMF continues to not receive the terminal's PDU Session Establishment Request request for S-NSSAI, after the Reg_timer expires, the AMF triggers the deregistration operation of the terminal.

Among them, when the Reg_Timer has not expired, optionally, the AMF can accept two different types of timers at the same time during the first terminal registration. In this case, the PCF does not distinguish between AM-PCF and SM-PCF, and only one type is deployed in the network. type of PCF, and then perform the corresponding operation. PDU_Timer can be sent to AMF at the same time as registration, and AMF can also trigger PDUSession Release. In this case, steps 608-613 can be skipped.

Step 608: The terminal initiates a PDU session establishment request (PDUSession Establishment Request) and carries a UE Behavior support request.

Step 609: Complete session SMF selection and PDU Session authentication and authentication

Steps 610-612, in the policy (Policy) process, the SMF selects the PCF and initiates an Npcf_SMPlicyControl_Create Request to the selected PCF, requesting the response policy supported by the corresponding UE Behavior. The PCF determines the response policy based on the terminal's contract, AF external application, terminal's current location, and network. One or more customized session control policies based on current load and other conditions, including PDU_timer and corresponding S-NSSAI, are returned to SMF for SMF to perform access control on the responding S-NSSAI.

Step 613, the rest of the PDU session establishment process.

Step 614: SMF starts the received PDU_Timer and monitors the current PDU session status.

Step 615: If the current UPF connection is active or there is a new UPF connection, the PDU_timer does not work, the UPF connection is released, and the PDU_Timer starts timing. If the PDU_Timer expires, SMF triggers the related operations of PDU Session Release (PDU SessionRelease).

Step 616: SMF sends a PDU connection release message to AMF, triggering AMF to start the corresponding Reg_Timer. If the Reg_Timer expires and there is no new PDU session request, AMF triggers the terminal deregistration process.

Figure 7 shows a schematic flow chart of a policy update method in the embodiment of the present application. As shown in Figure 7, the method mainly includes the following steps:

Step 701: After AM-PCF formulates and sends the control strategy (for example, the above-mentioned network control strategy), it decides to update the control strategy. The updated information may be triggered by one or more of the following situations (including but not limited to) a) Triggered by external AF b) UDR notification c) Analysis information obtained from NWDAF

Step 702: AM-PCF formulates a policy.

Step 703, AM-PCF sends the corresponding RPRM policy to AMF under Npcf_AMPolicyControl_UpdateNotify. In this solution, the control policy includes the on-demand network slice identification list (one or more S-NSSAI) and the corresponding control duration Reg_Timer.

Step 704: AMF deploys and saves the received policy.

Figure 8 shows a schematic flow chart of another policy update method in the embodiment of the present application. As shown in Figure 8, the method mainly includes the following steps:

Step 801: After SM-PCF formulates and sends a control policy (for example, the above-mentioned session control policy), SM-PCF decides to update the policy. The updated information may consist of one or more of the following (including but not limited to) Situation trigger a) Triggered by external AF b) UDR notification c) Analysis information obtained from NWDAF

Step 802: SM-PCF formulates strategy.

Step 803: PCF sends the corresponding policy to SMF under Npcf_SMPolicyControl_UpdateNotify. In this solution, the policy includes the on-demand network slice identification list (one or more S-NSSAI) and the corresponding control duration PDU_Timer.

Step 804: SMF deploys and saves the received policy.

The embodiments of the present application provide the above method, and the execution subject may be a virtual device. In the embodiment of the present application, a virtual device is used as an example to perform the above method to describe each device provided by the embodiment of the present application.

Figure 9 shows a schematic structural diagram of a device for obtaining allowed network slice selection assistance information provided by an embodiment of the present application. As shown in Figure 9, the device mainly includes: a first sending module 901 and a first receiving module 902.

In this embodiment of the present application, the first sending module 901 is configured to send a first registration request to the first network element, where the first registration request carries the NSSAI requested by the terminal; the first receiving module 902 is configured to Receive the first information sent by the first network element; wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI registered on demand, the first identification information Information used to indicate the NSSAI allowed for on-demand registration.

In a possible implementation, as shown in Figure 9, the device may further include: a first obtaining module 903 and a first determining module 904; wherein the first obtaining module 903 is used to obtain, based on URSP rules, Transmit the S-NSSAI corresponding to the PDU session of the service to be transmitted; the first determination module 904 is used to determine the S-NSSAI corresponding to the PDU session and an allowed on-demand registration NSSAI indicated by the first identification information Matching; the first sending module 901 is also used to send a second registration request, wherein the second registration request is used to request registration to the network slice corresponding to the S-NSSAI identifier; the first receiving module, It is also configured to receive a registration success response; the first sending module 902 is also configured to send a PDU session establishment request, where the PDU session establishment request is used to request the establishment of the PDU session.

In a possible implementation, the first registration request also carries first indication information indicating that the terminal behavior is supported.

The device for obtaining the allowed network slice selection assistance information in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip. The electronic device may be a terminal or other devices other than the terminal. For example, terminals may include but are not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in this embodiment of the application.

The device for obtaining the allowed network slice selection auxiliary information provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 2a and achieve the same technical effect. To avoid duplication, it will not be described again here.

Figure 10 shows another structural schematic diagram of an apparatus for obtaining allowed network slice selection auxiliary information provided by an embodiment of the present application. As shown in Figure 10, the apparatus 1000 mainly includes a second receiving module 1001, a second determining module 1002 and The second sending module 1003.

In this embodiment of the present application, the second receiving module 1001 is used to receive the first registration request sent by the terminal, wherein the first registration request carries the NSSAI requested by the terminal; the second determining module 1002 is used to Based on the first target information, determine at least one allowed NSSAI corresponding to the terminal; the second sending module 1003 is used to send the first information to the terminal, wherein the first information includes the allowed NSSAI and a first identification Information, wherein the allowed NSSAI includes the NSSAI in the at least one allowed NSSAI except the NSSAI corresponding to the network slice registered on demand, and the first identification information is used to indicate the at least one allowed NSSAI. NSSAI registered on demand.

In a possible implementation, the first target information includes at least one of the following:

Operational strategy;

The location information of the terminal;

User subscription information of the terminal;

The load of the network slice.

The device for obtaining the allowed network slice selection auxiliary information provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 2b and achieve the same technical effect. To avoid duplication, it will not be described again here.

Figure 11 shows a schematic structural diagram of a device for obtaining a control strategy provided by an embodiment of the present application. As shown in Figure 11, the device 1100 mainly includes: a third sending module 1101 and a third receiving module 1102.

In this embodiment of the present application, the third sending module 1101 is configured to send a first request to the second network element, where the first request is used for the network control policy corresponding to the terminal behavior information of the terminal, and the first request carries the terminal behavior information; the third receiving module 1102 is configured to receive at least one network control policy sent by the second network element, wherein the network control policy includes S-NSSAI and registration timer Correspondence.

In a possible implementation, as shown in Figure 11, the device may also include: a first control module 1103, used for:

Execute the registration process for the terminal to register in the first network slice corresponding to the first NSSAI;

If the terminal successfully registers with the first network slice, start a first registration timer corresponding to the first S-NSSAI according to the at least one network control policy;

If the PDU session establishment request of the first PDU session corresponding to the first S-NSSAI is not received before the first registration timer expires, perform deregistration of the terminal in the first network slice process.

In a possible implementation, the network control policy also includes the corresponding relationship between S-NSSAI and session timer; the third receiving module 1101 is also used to receive a PDU session establishment request initiated by the terminal, where , the PDU session establishment request is used to request the establishment of a second PDU session corresponding to the second S-NSSAI; the first control module 1103 is also used to start the connection with the second PDU session after determining that the second PDU session is successfully established. The first session timer corresponding to the second S-NSSAI; when the first session timer times out, release the second PDU session, wherein the UPF connection corresponding to the second PDU session is active state or establish a new UPF connection corresponding to the second PDU session, the first session timer is suspended, and when the UPF connection corresponding to the second PDU session is released, the first session The timer counts.

In a possible implementation, the third receiving module 1101 is further configured to receive a session release message sent by the third network element after receiving at least one network control policy returned by the second network element, wherein, The session release message is used to indicate releasing the second PDU session; the first control module 1103 is also used to release the second PDU session.

In a possible implementation, the first control module 1103 is also configured to start a second registration timer corresponding to the second S-NSSAI after releasing the second PDU session. If the PDU session establishment request corresponding to the second S-NSSAI is not received before the timer expires, execute the deregistration process of the terminal in the second network slice corresponding to the second S-NSSAI, wherein, The second S-NSSAI corresponds to the second PDU session.

In a possible implementation, the third receiving module 1102 is further configured to receive the updated at least one network control policy sent by the second network element.

The control strategy acquisition device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 3 and achieve the same technical effect. To avoid duplication, the details will not be described here.

Figure 12 shows a schematic structural diagram of a control strategy sending device provided by an embodiment of the present application. As shown in Figure 12, the device 1200 mainly includes: a fourth receiving module 1201, a third determining module 1202 and a fourth sending module 1203 .

In this embodiment of the present application, the fourth receiving module 1201 is used to receive the first request sent by the first network element, where the first request is used for the network control policy corresponding to the terminal behavior information of the terminal; the third determining module 1202, configured to determine at least one network control strategy based on the second target information, wherein the network control strategy includes a corresponding relationship between S-NSSAI and the registration timer; a fourth sending module 1203, configured to send the A network element sends the at least one network control policy.

In a possible implementation, the fourth receiving module 1201 is also configured to receive a second request sent by a third network element, where the second request is used for a session control policy corresponding to the terminal behavior information; The third determination module 1202 is further configured to determine at least one session control policy according to the second target information, wherein the session control policy includes a corresponding relationship between a single NSSAI and a session timer; the fourth The sending module 1203 is also configured to send the at least one session control policy to the third network element.

In a possible implementation, the third determining module 1202 is also used to determine to update the at least one session control policy, and obtain the updated at least one session control policy; the fourth sending module 1203, It is also used to send the updated at least one session control policy to the third network element.

In a possible implementation, the third determining module 1202 determines to update the at least one session control policy under at least one of the following circumstances:

Receive trigger information from an external AF, where the trigger information is used to indicate updating the at least one session control policy;

Receive a notification from the UDR, the notification indicating that the subscription information of the terminal has changed;

Obtain analysis information from the network data analysis function NWDAF.

In a possible implementation, the third determining module 1202 is also used to determine to update the at least one network control policy, and obtain the updated at least one network control policy; the fourth sending module 1203, It is also used to send the updated at least one session control policy to the first network element.

In a possible implementation, the third determining module 1202 determines to update the at least one network control policy under at least one of the following conditions:

Receive trigger information from an external AF, where the trigger information is used to indicate updating the at least one network control policy;

Receive a notification from the UDR, the notification indicating that the subscription information of the terminal has changed;

Get analysis information from NWDAF.

The control strategy sending device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 4 and achieve the same technical effect. To avoid duplication, details will not be described here.

Figure 13 shows a schematic structural diagram of a PDU session control device provided by an embodiment of the present application. As shown in Figure 13, the device 1300 mainly includes: a fifth receiving module 1301, a fifth sending module 1302 and a second control module 1303 .

In this embodiment of the present application, the fifth receiving module 1301 is used to receive a PDU session establishment request sent by the terminal, and the PDU session establishment request is used to request the establishment of a second PDU session; the fifth sending module 1302 is used to send a request to the second PDU session. The network element sends a second request, where the second request is used for a session control policy corresponding to the terminal behavior information of the terminal; the fifth receiving module 1301 is also used to receive at least A session control policy, wherein the session control policy includes the corresponding relationship between S-NSSAI and session timer; the second control module 1303 is configured to: after determining that the second PDU session is established, start the communication with the second PDU session. The first session timer corresponding to S-NSSAI, the second S-NSSAI is the S-NSSAI corresponding to the second PDU session; when the first session timer times out, release the second PDU session, wherein the first session timer is suspended when the user plane function UPF connection corresponding to the second PDU session is active or a new UPF connection corresponding to the second PDU session is established, When the UPF connection corresponding to the second PDU session is released, the first session timer counts.

In a possible implementation, the fifth sending module 1302 is further configured to send a session release message to the first network element, where the session release message is used to indicate releasing the second PDU session.

The PDU session control device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 5 and achieve the same technical effect. To avoid duplication, the details will not be described here.

Optionally, as shown in Figure 14, this embodiment of the present application also provides a communication device 1400, which includes a processor 1401 and a memory 1402. The memory 1402 stores programs or instructions that can be run on the processor 1401, such as , when the communication device 1400 is a terminal, when the program or instruction is executed by the processor 1401, each step of the above-mentioned allowed network slice selection assistance information acquisition method 200a embodiment can be achieved, and the same technical effect can be achieved. When the communication device 1400 is a network-side device, when the program or instruction is executed by the processor 1401, the steps of the method 200b for obtaining the allowed network slice selection auxiliary information are implemented, or the method 300 for obtaining the control policy is implemented. Each step, or implement each step of the above control policy sending method 400 embodiment, or implement each step of the above PDU session control method 500 embodiment, and can achieve the same technical effect, to avoid duplication, will not be repeated here. .

An embodiment of the present application also provides a terminal, including a processor and a communication interface. The processor is used to implement each step of the above-mentioned allowed network slice selection assistance information acquisition method 200b embodiment, and the communication interface is used to communicate with external devices. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 15 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 1500 includes but is not limited to: a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, a processor 1510, etc. At least some parts.

Those skilled in the art can understand that the terminal 1500 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 1510 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 15 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in this embodiment of the present application, the input unit 1504 may include a graphics processing unit (GPU) 15041 and a microphone 15042, and the graphics processor 15041 is responsible for the processing by an image capture device (such as Process the image data of still pictures or videos obtained by the camera). The display unit 1506 may include a display panel 15061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1507 includes a touch panel 15071 and at least one of other input devices 15072 . Touch panel 15071, also known as touch screen. The touch panel 15071 may include two parts: a touch detection device and a touch controller. Other input devices 15072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1501 can transmit it to the processor 1510 for processing; in addition, the radio frequency unit 1501 can send uplink data to the network side device. Generally, the radio frequency unit 1501 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.

Memory 1509 may be used to store software programs or instructions as well as various data. The memory 1509 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. Additionally, memory 1509 may include volatile memory or nonvolatile memory, or memory 1509 may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (ProgrammableROM, PROM), erasable programmable read-only memory (ErasablePROM, EPROM), electrically erasable read-only memory (EPROM), Programming read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM) , SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (Direct RambusRAM, DRRAM). Memory 1509 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1510 may include one or more processing units; optionally, the processor 1510 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 1510.

The radio frequency unit 150 is configured to send a first registration request to the first network element, where the first registration request carries the NSSAI requested by the terminal; receive the first information sent by the first network element; wherein, The first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI for on-demand registration, and the first identification information is used to indicate the allowed NSSAI for on-demand registration.

Embodiments of the present application also provide a network-side device, including a processor and a communication interface. The processor is used to implement each step of the above-mentioned method 200b for obtaining the allowed network slice selection auxiliary information, or to implement the above-mentioned method 300 for obtaining the control strategy. Each step of the embodiment, or each step of the above-mentioned control policy sending method 400 embodiment, or each step of the above-mentioned PDU session control method 500 embodiment, is implemented, and the communication interface is used to communicate with external devices. This network-side device embodiment corresponds to the above-mentioned network-side device method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in Figure 16, the network side device 1600 includes: a processor 1601, a network interface 1602, and a memory 1603. The network interface 1602 is, for example, a common public radio interface (CPRI).

Specifically, the network side device 1600 in this embodiment of the present invention also includes: instructions or programs stored in the memory 1603 and executable on the processor 1601. The processor 1601 calls the instructions or programs in the memory 1603 to execute the instructions shown in Figures 10 to 13. It shows the execution method of each module and achieves the same technical effect. To avoid duplication, it will not be repeated here.

Embodiments of the present application also provide a readable storage medium on which a program or instructions are stored. When the program or instructions are executed by a processor, the above allowed network slice selection auxiliary information acquisition method 200a is implemented. Each process, or implement each process of the above-mentioned allowed network slice selection auxiliary information acquisition method 200b embodiment, or implement each process of the above-mentioned control policy acquisition method 300 embodiment, or implement the above-mentioned control policy sending method 400 embodiment Each process, or each process of the above-mentioned PDU session control method 500 embodiment, can achieve the same technical effect. To avoid duplication, it will not be described again here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions. The above-mentioned allowed network slice selection auxiliary information Each process of the obtainment method 200a embodiment, or implement each process of the above allowed network slice selection auxiliary information acquisition method 200b embodiment, or implement each process of the above control strategy acquisition method 300 embodiment, or implement the above control strategy The various processes of the embodiment of the sending method 400, or the various processes of the embodiment of the above-mentioned PDU session control method 500, can achieve the same technical effect. To avoid duplication, they will not be described again here.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the above allowed network slice selection. The various processes of the method 200a for obtaining auxiliary information, or the various processes of the method 200b for obtaining auxiliary information for allowing network slice selection, or the various processes of the method 300 for obtaining the control policy, or the above Each process of the control policy sending method 400 embodiment, or each process of the above PDU session control method 500 embodiment, can achieve the same technical effect, and will not be described again here to avoid duplication.

The embodiment of the present application also provides a system for obtaining allowed network slice selection auxiliary information, including: a terminal and a network side device. The terminal can be used to perform the above-mentioned method 200a for obtaining allowed network slice selection auxiliary information. The network side device may be used to perform the various processes of the above-mentioned embodiment of the method 200b for obtaining the allowed network slice selection assistance information, or perform the various processes of the above-mentioned embodiment of the method 300 for obtaining the control policy, or Execute each process of the above-mentioned control policy sending method 400 embodiment, or execute each process of the above-mentioned PDU session control method 500 embodiment.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk , CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims (40)

1. An allowed method for obtaining auxiliary information for network slice selection, which is characterized by including: The terminal sends a first registration request to the first network element, wherein the first registration request carries the network slice selection assistance information NSSAI requested by the terminal; The terminal receives the first information sent by the first network element; Wherein, the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI for on-demand registration, and the first identification information is used to indicate the allowed NSSAI for on-demand registration. 2. The method according to claim 1, characterized in that, after the terminal receives the first information sent by the network side device, the method further includes: The terminal obtains the single network slice selection auxiliary information S-NSSAI corresponding to the protocol data unit PDU session that transmits the service to be transmitted based on the user equipment routing option policy URSP rule; Determine that the S-NSSAI corresponding to the PDU session matches an allowed on-demand registration NSSAI indicated by the first identification information; The terminal sends a second registration request, where the second registration request is used to request registration to the network slice corresponding to the S-NSSAI; After receiving the registration success response, the terminal sends a PDU session establishment request, where the PDU session establishment request is used to request establishment of the PDU session. 3. The method according to claim 1 or 2, characterized in that the first registration request also carries first indication information indicating that the terminal behavior is supported. 4. A method for obtaining allowed network slice selection auxiliary information, which is characterized by including: The first network element receives the first registration request sent by the terminal, wherein the first registration request carries the NSSAI requested by the terminal; The first network element determines at least one allowed NSSAI corresponding to the terminal based on the first target information; The first network element sends first information to the terminal, wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI includes the at least one allowed NSSAI except on-demand NSSAI other than the registered NSSAI, the first identification information is used to indicate the NSSAI registered on demand among the at least one allowed NSSAI. 5. The method according to claim 4, characterized in that the first target information includes at least one of the following: Operational strategy; The location information of the terminal; User subscription information of the terminal; The load of the network slice. 6. A method for obtaining a control strategy, which is characterized by including: The first network element sends a first request to the second network element, where the first request is used for a network control policy corresponding to the terminal behavior information of the terminal, and the first request carries the terminal behavior information; The first network element receives at least one network control policy sent by the second network element, wherein the network control policy includes a correspondence between S-NSSAI and a registration timer. 7. The method according to claim 6, characterized in that the method further comprises: The first network element executes a registration process for the terminal to register in the first network slice corresponding to the first S-NSSAI; If the terminal successfully registers with the first network slice, the first network element starts a first registration timer corresponding to the first S-NSSAI according to the at least one network control policy; If the PDU session establishment request of the first PDU session corresponding to the first S-NSSAI is not received before the first registration timer expires, the first network element executes the terminal operation in the first PDU session. The deregistration process of a network slice. 8. The method according to claim 6, wherein the network control policy further includes a corresponding relationship between S-NSSAI and session timer. 9. The method according to claim 8, characterized in that, after the first network element receives at least one network control policy sent by the second network element, the method further includes: The first network element receives a PDU session establishment request initiated by the terminal, wherein the PDU session establishment request is used to request the establishment of a second PDU session corresponding to the second S-NSSAI; After determining that the second PDU session is successfully established, the first network element starts the first session timer corresponding to the second S-NSSAI; When the first session timer times out, the first network element releases the second PDU session, wherein the user plane function UPF connection corresponding to the second PDU session is active or established with the In the case of a new UPF connection corresponding to the second PDU session, the first session timer is suspended; in the case of a UPF connection corresponding to the second PDU session being released, the first session timer counts. 10. The method according to claim 6, characterized in that, after the first network element receives at least one network control policy sent by the second network element, the method further includes: The first network element receives a session release message sent by the third network element, wherein the session release message is used to indicate releasing the second PDU session; The first network element releases the second PDU session. 11. The method according to claim 9 or 10, characterized in that, after releasing the second PDU session, the method further includes: The first network element starts the second registration timer corresponding to the second S-NSSAI and does not receive the PDU session establishment request corresponding to the second S-NSSAI before the second registration timer times out. Next, the first network element performs a deregistration process of the terminal in the second network slice corresponding to the second S-NSSAI, where the second S-NSSAI corresponds to the second PDU session. 12. The method according to any one of claims 6 to 11, characterized in that, after the first network element receives at least one network control policy sent by the second network element, the method further includes: The first network element receives the updated at least one network control policy sent by the second network element; The first network element saves and uses the updated at least one network control policy. 13. A method for sending a control policy, characterized by including: The second network element receives the first request sent by the first network element, wherein the first request is used for the network control policy corresponding to the terminal behavior information of the terminal; The second network element determines at least one network control strategy based on the second target information, wherein the network control strategy includes a corresponding relationship between S-NSSAI and registration timer; The second network element sends the at least one network control policy to the first network element. 14. The method of claim 13, wherein the second target information includes at least one of the following: User subscription information of the terminal; The location information of the terminal; External application of application function AF; The load of the network slice. 15. The method according to claim 13, wherein the network control policy further includes a corresponding relationship between S-NSSAI and session timer. 16. The method of claim 13, wherein after the second network element sends the at least one network control policy to the first network element, the method further includes: The second network element receives a second request sent by a third network element, wherein the second request is used for a session control policy corresponding to the terminal behavior information; The second network element determines at least one session control policy based on the second target information, wherein the session control policy includes a corresponding relationship between S-NSSAI and session timer; The second network element sends the at least one session control policy to the third network element. 17. The method according to claim 16, wherein after the second network element sends the at least one session control policy to the third network element, the method further includes: The second network element determines to update the at least one session control policy; The second network element obtains at least one updated session control policy; The second network element sends the updated at least one session control policy to the third network element. 18. The method according to claim 17, characterized in that the second network element determines to update the at least one session control policy under at least one of the following circumstances: The second network element receives trigger information from the external AF, where the trigger information is used to indicate updating the at least one session control policy; The second network element receives a notification from the unified data warehousing UDR, and the notification indicates that the subscription information of the terminal has changed; The second network element obtains analysis information from the network data analysis function NWDAF. 19. The method according to any one of claims 13 to 17, characterized in that, after the second network element sends the at least one network control policy to the first network element, the method further include: The second network element determines to update the at least one network control policy; The second network element obtains at least one updated network control policy; The second network element sends the updated at least one network control policy to the first network element. 20. The method according to claim 19, characterized in that the second network element determines to update the at least one network control policy under at least one of the following conditions: The second network element receives trigger information from the external AF, where the trigger information is used to indicate updating the at least one network control policy; The second network element receives a notification from the UDR, and the notification indicates that the subscription information of the terminal has changed; The second network element obtains analysis information from NWDAF. 21. A PDU session control method, characterized by including: The third network element receives the PDU session establishment request sent by the terminal, and the PDU session establishment request is used to request the establishment of the second PDU session; The third network element sends a second request to the second network element, where the second request is used for a session control policy corresponding to terminal behavior information of the terminal; The third network element receives at least one session control policy sent by the second network element, wherein the session control policy includes the corresponding relationship between S-NSSAI and session timer; After determining that the second PDU session is established, the third network element starts the first session timer corresponding to the second S-NSSAI, and the second S-NSSAI is the S corresponding to the second PDU session. -NSSAI; When the first session timer times out, the third network element releases the second PDU session, wherein the user plane function UPF connection corresponding to the second PDU session is active or established with the In the case of a new UPF connection corresponding to the second PDU session, the first session timer is suspended; in the case of a UPF connection corresponding to the second PDU session being released, the first session timer counts. 22. The method according to claim 21, characterized in that, after the third network element releases the second PDU session, the method further includes: The third network element sends a session release message to the first network element, where the session release message is used to indicate releasing the second PDU session. 23. A device for obtaining permitted network slice selection auxiliary information, characterized in that it includes: The first sending module is configured to send a first registration request to the first network element, wherein the first registration request carries the NSSAI requested by the terminal; A first receiving module, configured to receive the first information sent by the first network element; Wherein, the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI does not include: NSSAI for on-demand registration, and the first identification information is used to indicate the allowed NSSAI for on-demand registration. 24. The device according to claim 23, characterized in that the device further comprises: a first acquisition module and a first determination module; wherein, The first acquisition module is used to acquire the S-NSSAI corresponding to the PDU session that transmits the service to be transmitted based on the URSP rules; The first determination module is configured to determine that the S-NSSAI corresponding to the PDU session matches an allowed on-demand registration NSSAI indicated by the first identification information; The first sending module is also configured to send a second registration request, wherein the second registration request is used to request registration to the network slice corresponding to the S-NSSAI identifier; The first receiving module is also used to receive a successful registration response; The first sending module is further configured to send a PDU session establishment request, where the PDU session establishment request is used to request establishment of the PDU session. 25. A device for obtaining permitted network slice selection auxiliary information, characterized in that it includes: The second receiving module is configured to receive the first registration request sent by the terminal, wherein the first registration request carries the NSSAI requested by the terminal; A second determination module, configured to determine at least one allowed NSSAI corresponding to the terminal based on the first target information; The second sending module is configured to send first information to the terminal, wherein the first information includes allowed NSSAI and first identification information, wherein the allowed NSSAI includes the at least one allowed NSSAI except for NSSAI other than the NSSAI corresponding to the network slice that needs to be registered, and the first identification information is used to indicate the NSSAI registered on demand in the at least one allowed NSSAI. 26. A device for controlling policy acquisition, characterized by comprising: The third sending module is configured to send a first request to the second network element, where the first request is used for the network control policy corresponding to the terminal behavior information of the terminal, and the first request carries the terminal behavior information. ; The third receiving module is configured to receive at least one network control policy sent by the second network element, wherein the network control policy includes the corresponding relationship between the S-NSSAI and the registration timer. 27. The device of claim 26, further comprising: The first control module is used for: Execute the registration process for the terminal to register in the first network slice corresponding to the first S-NSSAI; If the terminal successfully registers with the first network slice, start a first registration timer corresponding to the first S-NSSAI according to the at least one network control policy; If the PDU session establishment request of the first PDU session corresponding to the first S-NSSAI is not received before the first registration timer expires, perform deregistration of the terminal in the first network slice process. 28. The device according to claim 27, wherein the network control policy further includes the corresponding relationship between S-NSSAI and session timer; The third receiving module is also configured to receive a PDU session establishment request initiated by the terminal, wherein the PDU session establishment request is used to request the establishment of a second PDU session corresponding to the second S-NSSAI; The first control module is also configured to start a first session timer corresponding to the second S-NSSAI after determining that the second PDU session is successfully established; when the first session timer times out, Next, release the second PDU session, wherein, in the case where the UPF connection corresponding to the second PDU session is active or a new UPF connection corresponding to the second PDU session is established, the first session The timer is paused, and when the UPF connection corresponding to the second PDU session is released, the first session timer counts. 29. The device according to claim 27, characterized in that, The third receiving module is further configured to receive a session release message sent by the third network element after receiving at least one network control policy returned by the second network element, wherein the session release message is used to indicate release. Second PDU session; The first control module is also used to release the second PDU session. 30. The device according to claim 28 or 29, characterized in that, The first control module is also configured to start a second registration timer corresponding to the second S-NSSAI after releasing the second PDU session. If no registration timer corresponding to the second S-NSSAI is received before the second registration timer expires, In the case of a PDU session establishment request corresponding to the second S-NSSAI, execute the deregistration process of the terminal in the second network slice corresponding to the second S-NSSAI, wherein the second S-NSSAI and the The second PDU session corresponds to the above. 31. The device according to any one of claims 26 to 30, characterized in that the third receiving module is further configured to receive the updated at least one network control sent by the second network element. Strategy. 32. A control strategy sending device, characterized in that it includes: The fourth receiving module is configured to receive the first request sent by the first network element, wherein the first request is used for the network control policy corresponding to the terminal behavior information of the terminal; The third determination module is configured to determine at least one network control strategy according to the second target information, wherein the network control strategy includes the corresponding relationship between the S-NSSAI and the registration timer; The fourth sending module is configured to send the at least one network control policy to the first network element. 33. The device according to claim 32, characterized in that, The fourth receiving module is further configured to receive a second request sent by a third network element, where the second request is used for a session control policy corresponding to the terminal behavior information; The third determination module is further configured to determine at least one session control policy based on the second target information, wherein the session control policy includes a corresponding relationship between a single NSSAI and a session timer; The fourth sending module is also configured to send the at least one session control policy to the third network element. 34. The device according to claim 33, characterized in that, The third determining module is also configured to determine to update the at least one session control policy, and obtain the updated at least one session control policy; The fourth sending module is also configured to send the updated at least one session control policy to the third network element. 35. The device according to any one of claims 32 to 34, characterized in that, The third determining module is also configured to determine to update the at least one network control policy, and obtain the updated at least one network control policy; The fourth sending module is also configured to send the updated at least one session control policy to the first network element. 36. A PDU session control device, characterized by including: The fifth receiving module is used to receive a PDU session establishment request sent by the terminal, where the PDU session establishment request is used to request the establishment of a second PDU session; A fifth sending module, configured to send a second request to the second network element, where the second request is used for a session control policy corresponding to the terminal behavior information of the terminal; The fifth receiving module is also configured to receive at least one session control policy sent by the second network element, wherein the session control policy includes the corresponding relationship between S-NSSAI and session timer; The second control module is used for: After determining that the second PDU session is established, start the first session timer corresponding to the second S-NSSAI, where the second S-NSSAI is the S-NSSAI corresponding to the second PDU session; When the first session timer times out, release the second PDU session, wherein the user plane function UPF connection corresponding to the second PDU session is active or established corresponding to the second PDU session. In the case of a new UPF connection, the first session timer is suspended, and in the case of the UPF connection corresponding to the second PDU session is released, the first session timer counts. 37. The device according to claim 36, wherein the fifth sending module is further configured to send a session release message to the first network element, wherein the session release message is used to indicate releasing the second PDU session. . 38. A terminal, characterized in that it includes a processor and a memory, the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the implementation of claim 1 Go to the steps of the method for obtaining the allowed network slice selection auxiliary information described in any one of 3. 39. A network-side device, characterized in that it includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following implementations are implemented: The steps of obtaining the allowed network slice selection auxiliary information according to any one of claims 4 to 5, or the steps of realizing the control policy obtaining method according to any one of claims 6 to 12, or realizing the steps of claim 13 The steps of the control policy sending method as described in any one of claims 20 to 20, or the steps of implementing the PDU session control method as described in any one of claims 21 to 22. 40. A readable storage medium, characterized in that programs or instructions are stored on the readable storage medium, and when the programs or instructions are executed by a processor, the allowed functions as described in any one of claims 4 to 5 are realized. The steps of obtaining the network slice selection auxiliary information, or the steps of implementing the control policy obtaining method as described in any one of claims 6 to 12, or implementing the allowed network slicing as described in any one of claims 4 to 12 The step of selecting the acquisition method of auxiliary information, or the step of implementing the sending method of the control policy as described in any one of claims 13 to 20, or the step of implementing the PDU session control method as described in any one of claims 21 to 22 A step of.