WO2022267872A1

WO2022267872A1 - Network slice selection method and related apparatus

Info

Publication number: WO2022267872A1
Application number: PCT/CN2022/097210
Authority: WO
Inventors: 韩耀辉; 宋平; 赵志华
Original assignee: 华为技术有限公司
Priority date: 2021-06-21
Filing date: 2022-06-06
Publication date: 2022-12-29
Also published as: CN115580919A

Abstract

Provided in the present application are a network slice selection method and a related apparatus. The method comprises: a terminal device acquiring a UE route selection policy (URSP) code stream which is sent by a network device; according to a first parameter and a slice or service type (SST) field, determining, from a plurality of network slices which are associated with the URSP code stream, a network slice that is used for establishing a protocol data unit (PDU) session; and establishing the PDU session on the basis of the network slice which is used for establishing the PDU session, wherein the SST field is a field in the URSP code stream that is used for identifying the type of each of the plurality of network slices which are associated with the URSP code stream; and the first parameter is a pre-configured parameter which is associated with the terminal device, and the first parameter is used for identifying a network slice type which is applicable to the terminal device. By means of the method, resource waste caused by a terminal device establishing a PDU session by using an inappropriate network slice can be avoided.

Description

A network slice selection method and related device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China on June 21, 2021, with application number 202110686904.4, and application title "A Method for Selecting Network Slices and Related Devices", the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the field of communication technologies, and in particular to a network slice selection method and related devices.

Background technique

Currently, under the standalone (SA) network, network slicing has become a mandatory feature of the fifth-generation mobile communication (5th-generation, 5G) network. Network slicing refers to the integration of 5G networks into different functional requirements (such as billing, policy control, security, mobility, etc.) and different performance requirements (such as delay, mobility, reliability, etc.) Multiple logical subnets with different characteristics and isolated from each other are virtualized on a set of physical devices.

Terminal equipment (user equipment, UE) can access network slices with different characteristics according to the terminal routing selection policy (UE route selection policy, URSP) code stream issued by the network equipment. Specifically, the terminal device establishes a protocol data unit session (protocol data unit session, PDU session) according to the URSP code stream, so as to access one of the multiple network slices associated with the URSP code stream.

However, when a terminal device establishes a PDU session in the above manner, the network slice used may not be suitable for the terminal device, and even if the PDU session is successfully established, the terminal device cannot use the network slice, thereby causing waste of resources.

Contents of the invention

Embodiments of the present application provide a method for selecting a network slice and a related device, which can avoid resource waste caused by terminal equipment using inappropriate network slices to establish a PDU session.

In a first aspect, the embodiments of the present application provide a network slice selection method. In this method, the terminal device obtains the routing strategy (URSP) code stream sent by the network device; according to the first parameter and the slice or service type (SST) field, from multiple network slices associated with the URSP code stream, determine the A network slice of a protocol data unit PDU session is established, and a PDU session is established based on the network slice used for establishing the PDU session. The SST field is a field used in the URSP code stream to identify the type of each network slice in the multiple network slices associated with the URSP code stream. The first parameter is a pre-configured parameter associated with the terminal device, and the first parameter is used to identify a network slice type applicable to the terminal device.

Since the first parameter is used to identify the type of network slice applicable to the terminal device, the network slice determined by the terminal device based on the first parameter and the SST field is a suitable network slice for the terminal device itself, that is, the terminal device adopts a suitable Network slicing to establish PDU sessions can avoid resource waste caused by terminal devices using inappropriate network slicing to establish PDU sessions.

In an optional implementation manner, the above-mentioned URSP code stream includes URSP rules with different priorities, and each URSP rule includes routing options with different priorities; the terminal device, according to the first parameter and the slice or service type (SST) field, From the multiple network slices associated with the URSP code stream, determine the network slice used to establish the PDU session. Among the multiple network slices associated with the URSP stream, select the first network slice; if the SST field of the first network slice matches the first parameter, determine the first network slice as the network used to establish the PDU session slice.

It can be seen that the terminal device first selects the first network slice according to the rules stipulated in the protocol (that is, the priority of URSP code stream and URSP rules). When the network slice type indicated by the SST field of the network slice is the same as the network slice identified by the first parameter , determining the first network slice as a network slice for establishing the PDU session, so that the determined network slice is a network slice applicable to the terminal device itself.

In an optional implementation, the terminal device can also configure a dialing factor for each group of routings associated with the URSP code stream, and the initial value of the dialing factor is the first value; the first value is a real number; Based on the first routing selection corresponding to the network slice used to establish the PDU session, in the case that each second network slice fails to establish the PDU session, the dialing factor of the first routing selection is subtracted from the second value that is not zero ; The second network slice is a network slice whose SST field matches the first parameter in the first routing selection.

It can be seen that the terminal device is configured with a dialing factor for each group of routing, and when all the network slices in a routing that are applicable to the terminal device fail to establish a PDU session, the dialing factor of the routing is subtracted by a value that is not equal to A second value of zero to mark the routing to use when establishing a PDU session fails. Therefore, when the terminal device re-establishes the PDU session, the route selection used when the previous establishment of the PDU session fails, is beneficial to improve the efficiency of the terminal device in establishing the PDU session.

In another optional implementation manner, the terminal device may also configure a dialing factor for the network slice whose SST field matches the first parameter among the multiple network slices associated with the URSP, and the initial value of the dialing factor is the first value; the first The value is a real number; if the PDU session establishment fails based on the network slice used to establish the PDU session, the dialing factor of the network slice used to establish the PDU session is subtracted from a second value that is not zero.

It can be seen that the terminal device configures the dialing factor for the network slice applicable to the terminal device among multiple network slices, and when the terminal device fails to establish a PDU session using one of the network slices, the dialing factor of the network slice is subtracted by a value that is not equal to The second value of zero is used to mark the network slice used when the terminal device fails to establish the PDU session. Therefore, when the terminal device re-establishes the PDU session, the network slicing used when the PDU session fails to be established before is beneficial to improve the efficiency of the terminal device in establishing the PDU session.

In yet another optional implementation manner, when the terminal device successfully establishes the PDU session based on the network slice used to establish the PDU session, it configures the dialing factor for the network slice used to establish the PDU session, and the initial value of the dialing factor is the first A value; the first value is a real number.

It can be seen that in this embodiment, the terminal device configures the dial factor for the network slice used when the PDU session is established successfully, so as to mark the network slice used by the terminal device when the PDU session is successfully established. Therefore, it is beneficial for the terminal device to directly use the network slice configured with the dialing factor when re-establishing the PDU session, thereby improving the success rate of establishing the PDU session for the terminal device.

In an optional implementation, the terminal device can also determine whether the network where the terminal device is located changes, or the URSP code stream used to establish the PDU session at the current moment when the established PDU session is disconnected and reconnected to the network Whether there is a change; when the network where the terminal device is located or the URSP code stream used to establish the PDU session currently does not change, according to the dialing factor of the routing rule associated with the URSP code stream, or the dialing factor of the associated network slice, from the URSP Determine the network slice used to establish the PDU session among the multiple network slices associated with the code stream; establish the PDU session based on the network slice used to establish the PDU session.

It can be seen that when the terminal device disconnects the established PDU session and reconnects to the network, if the network where the terminal device is located or the URSP code stream used to establish the PDU session currently does not change, the terminal device is based on the dialing factor of the routing rule. Or the dialing factor of the network slice to determine the network slice used to establish the PDU session. This method can prevent the terminal device from using the routing or network slicing used when the PDU session failed to be established before, thereby improving the success rate of the terminal device to establish the PDU session.

In an optional implementation manner, when the above-mentioned second value is a positive number, and the terminal device establishes a PDU session when initially accessing the network, the dialing factor is configured for each group of routing selections in the multiple routing selections associated with the URSP code stream . Then, when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the dialing factor of the routing rule associated with the URSP code stream, multiple networks associated with the URSP code stream The network slice used to establish the PDU session in the slice can refer to: when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the priority of the URSP rule and the priority of routing selection level, select the second route selection in order of priority from high to low; when the dialing factor of the second route selection is greater than the first threshold, select the third network slice from the plurality of network slices associated with the second route selection; If the SST field of the third network slice matches the first parameter, the third network slice is determined as the network slice for establishing the PDU session.

It can be seen that when the above-mentioned second value is a positive number and the terminal device establishes a PDU session when initially accessing the network, a dialing factor is configured for each group of multiple routings associated with the URSP code stream. Then, the value of the dialing factor of the routing selection is greater than the first threshold, which can indicate that the number of times the terminal device fails to establish a PDU session using the network slice in the routing selection is within a certain range before the PDU session is disconnected, and the terminal device uses the routing selection. The network slice in the route selection has a higher probability of successfully establishing a PDU session, and the terminal device can still use the network slice in the routing selection to establish a PDU session, which is beneficial to improve the success rate of the terminal device in establishing a PDU session.

In another optional implementation manner, when the terminal device is in the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the dialing factor of the routing rule associated with the URSP code stream, the URSP Determining the network slice used to establish a PDU session among the multiple network slices associated with the code stream can also refer to: when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the URSP rule The priority of the route selection and the priority of the route selection, select the second route selection in order of priority from high to low; when the dial factor of the second route selection is equal to the first value, select the associated multiple network slices from the second route , select the third network slice; if the SST field of the third network slice matches the first parameter, determine the third network slice as the network slice for establishing the PDU session.

This is because the routing factor whose value is the first value is the routing selection that the terminal device has not used before. When the terminal device establishes a PDU session again, it can use the network slices in these routing selections to establish a PDU session, which can also improve the terminal device. The success rate of establishing a PDU session.

In another optional implementation manner, the second value is a positive number, and the terminal device is configured with a dialing factor for the network slice applicable to the terminal device among multiple network slices; then, the terminal device is in the network where the terminal device is located Or when the URSP code stream used to establish the PDU session at the current moment has not changed, according to the dialing factor of the network slice associated with the URSP code stream, determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, It can refer to: when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the priority of the URSP rule and the priority of routing selection, select according to the order of priority from high to low A third network slice configured with a dialing factor; when the dialing factor of the third network slice is greater than a first threshold or equal to a first value, determine the third network slice as a network slice for establishing a PDU session.

In yet another optional implementation manner, if the terminal device configures the dialing factor for the network slice used when the PDU session is established successfully, then the URSP code used by the terminal device to establish the PDU session on the network where the terminal device is located or at the current moment When the flow does not change, according to the dialing factor of the network slice associated with the URSP code stream, determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream. It can also refer to: the network slice where the terminal device is located Or when the URSP code stream used to establish the PDU session at the current moment does not change, determine the network slice configured with the dial factor as the network slice used to establish the PDU session.

It can be seen that the terminal device directly uses the network slice configured with the dial factor to establish the PDU session, which can make the terminal device successfully establish the PDU session, that is, the success rate of the terminal device to establish the PDU session is improved.

In an optional implementation, when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment changes, it indicates that the previously used URSP code stream is no longer applicable to the establishment of the current PDU session , so the terminal device clears the value of each dialing factor, and executes the first parameter, and the slice or service type (SST) field, from the multiple network slices associated with the URSP code stream, to determine the protocol data unit PDU session used to establish The steps of network slicing.

In a second aspect, the present application further provides a communication device. The communication device is capable of realizing some or all functions of the terminal device described in the first aspect above. For example, the function of the communication device may have the functions of some or all embodiments of the terminal device described in the first aspect of the present application, or may have the function of independently implementing any one of the embodiments of the present application. The functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

In a possible design, the structure of the communication device may include a processing unit and a communication unit, and the processing unit is configured to support the communication device to perform corresponding functions in the foregoing method. The communication unit is used to support communication between the communication device and other communication devices. The communication device may further include a storage unit, which is used to be coupled with the processing unit and the transceiver unit, and stores necessary program instructions and data of the communication device.

In one embodiment, the communication device includes:

A processing unit, configured to acquire a routing policy (URSP) code stream sent by a network device;

The processing unit is further configured to determine the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, wherein, The first parameter is a pre-configured parameter associated with the terminal device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is used in the URSP code stream to identify A field of the type of each network slice in the multiple network slices associated with the URSP code stream;

The processing unit is further configured to establish a PDU session based on the network slice used for establishing the PDU session.

In addition, in this aspect, for other optional implementation manners of the uplink communication device, reference may be made to the relevant content of the first aspect above, which will not be described in detail here.

As an example, the transceiver unit may be a transceiver or a communication interface, the storage unit may be a memory, and the processing unit may be a processor.

In one embodiment, the communication device includes:

A processor, configured to obtain a routing policy (URSP) code stream sent by a network device;

The processor is further configured to determine the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, wherein, The first parameter is a pre-configured parameter associated with the terminal device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is used in the URSP code stream to identify A field of the type of each network slice in the multiple network slices associated with the URSP code stream;

The processor is further configured to establish a PDU session based on the network slice used for establishing the PDU session.

In another implementation manner, the communication device is a chip or a chip system. The processing unit may also be embodied as a processing circuit or a logic circuit; the transceiver unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system.

During implementation, the processor may be used to perform, for example but not limited to, baseband related processing, and the transceiver may be used to perform, for example but not limited to, radio frequency transceiving. The above-mentioned devices may be respectively arranged on independent chips, or at least partly or all of them may be arranged on the same chip. For example, processors can be further divided into analog baseband processors and digital baseband processors. Wherein, the analog baseband processor can be integrated with the transceiver on the same chip, and the digital baseband processor can be set on an independent chip. With the continuous development of integrated circuit technology, more and more devices can be integrated on the same chip. For example, a digital baseband processor can be integrated with various application processors (such as but not limited to graphics processors, multimedia processors, etc.) on the same chip. Such a chip can be called a system chip (System on a Chip, SoC). Whether each device is independently arranged on different chips or integrated and arranged on one or more chips often depends on the needs of product design. The embodiments of the present application do not limit the implementation forms of the foregoing devices.

In a third aspect, the present application further provides a processor configured to execute the above various methods. In the process of executing these methods, the process of sending the above information and receiving the above information in the above method can be understood as the process of outputting the above information by the processor and the process of receiving the input of the above information by the processor. When outputting the above information, the processor outputs the above information to the transceiver for transmission by the transceiver. After the above information is output by the processor, other processing may be required before reaching the transceiver. Similarly, when the processor receives the above-mentioned input information, the transceiver receives the above-mentioned information and inputs it to the processor. Furthermore, after the transceiver receives the above information, the above information may need to be processed before being input to the processor.

Based on the above principles, for example, the acquisition of the URSP code stream mentioned in the foregoing method can be understood as the processor inputting the URSP code stream.

For the transmitting, sending and receiving operations involved in the processor, if there is no special description, or if it does not conflict with its actual function or internal logic in the relevant description, it can be understood more generally as the processor output and Operations such as receiving and inputting, rather than transmitting, sending and receiving operations directly performed by radio frequency circuits and antennas.

During implementation, the above-mentioned processor may be a processor dedicated to performing these methods, or may be a processor that executes computer instructions in a memory to perform these methods, such as a general-purpose processor. The above-mentioned memory can be a non-transitory (non-transitory) memory, such as a read-only memory (Read Only Memory, ROM), which can be integrated with the processor on the same chip, or can be respectively arranged on different chips. The embodiment does not limit the type of the memory and the arrangement of the memory and the processor.

In a fourth aspect, the present application further provides a communication system, where the system includes at least one terminal device and at least one network device according to the above aspect. In another possible design, the system may further include other devices that interact with the terminal device and the network device in the solution provided by the present application.

In a fifth aspect, the present application provides a computer-readable storage medium for storing computer software instructions, and when the instructions are executed by a communication device, the method described in the above-mentioned first aspect is implemented.

In a sixth aspect, the present application further provides a computer program product including instructions, which, when run on a communication device, cause the communication device to execute the method described in the first aspect above.

In a seventh aspect, the present application provides a chip system, which includes a processor and a communication interface, the communication interface is used to input and/or output information, and the processor is used to execute a computer executable program, so that the installed The terminal device of the chip system executes the functions involved in the first aspect. For example, at least one of the data and information involved in the above methods is determined or processed. In a possible design, the chip system further includes a memory, and the memory is configured to store necessary program instructions and data of the terminal. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

Description of drawings

FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a URSP code stream provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of network slice selection auxiliary information for a single network slice provided by an embodiment of the present application;

FIG. 4 is a schematic flow diagram of establishing a PDU session provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a network slice selection method provided in an embodiment of the present application;

FIG. 6 is a schematic flowchart of another network slice selection method provided by an embodiment of the present application;

FIG. 7 is a block diagram of an implementation of establishing a PDU session provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another network slice selection method provided by an embodiment of the present application;

FIG. 9 is another implementation block diagram of establishing a PDU session provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Fig. 11 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a chip provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

First, in order to better understand the method for selecting a network slice disclosed in the embodiment of the present application, the communication system to which the embodiment of the present application is applicable is described.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application. The communication system may include but not limited to a network device and a terminal device. The number and form of devices shown in FIG. 1 are for example and do not constitute a limitation to the embodiment of the present application. In practical applications, two or more network devices and two or more terminal devices may be included. The communication system shown in FIG. 1 is described by taking one network device and one terminal device, and the network device can provide services for the terminal device as an example. Wherein, the network equipment in FIG. 1 is an example of a base station, and the terminal equipment is an example of a customer premise equipment (CPE) product. Understandably, the terminal device is not limited to CPE products, and may also be any user equipment capable of communicating with network devices, such as mobile phones and tablets.

The technical solutions of the embodiments of the present application can be applied to various communication systems. For example, the fourth-generation mobile communication (4th-generation, 4G) system, the fifth-generation mobile communication (5th-generation, 5G) system, the sixth-generation mobile communication (6th-generation, 6G) system and with the continuous development of communication technology Development, the technical solution of the embodiment of the present application can also be used in a subsequent evolved communication system, such as a seventh-generation mobile communication (7th-generation, 7G) system and so on.

In the embodiment of the present application, the network device is a CN device in a core network (core network, CN). The CN may include one or more CN devices. Taking the 5G communication system as an example, the CN may include access and mobility management function (access and mobility management function, AMF) network elements, session management function (session management function, SMF) ) network element, user plane function (UPF) network element, policy control function (PCF) network element, unified data management (unified data management, UDM) network element, application function (application function, AF) ) Network elements, etc.

The AMF network element is a control plane network element provided by the operator network, responsible for access control and mobility management of terminal equipment accessing the operator network, such as including mobility status management, assigning temporary user IDs, authenticating and authorizing users, etc. .

The SMF network element is a control plane network element provided by the operator network, and is responsible for managing the protocol data unit (protocol data unit, PDU) session of the terminal device. A PDU session is a channel for transmitting PDUs, and terminal devices need to transmit PDUs to and from a data network (DN) through the PDU session. The PDU session is established, maintained and deleted by the SMF network element. SMF network elements include session management (such as session establishment, modification and release, including tunnel maintenance between UPF and RAN), selection and control of UPF network elements, service and session continuity (service and session continuity, SSC) mode selection, Session-related functions such as roaming.

The UPF network element is the gateway provided by the operator, and is the gateway for communication between the operator's network and the DN. The UPF network element includes functions related to the user plane such as data packet routing and transmission, packet detection, quality of service (QoS) processing, uplink packet detection, and downlink data packet storage.

The PCF network element is a control plane function provided by the operator, and is used to provide the policy of the PDU session to the SMF network element. Policies may include accounting-related policies, QoS-related policies, and authorization-related policies.

The AF network element is a functional network element that provides various capability exposure services. It provides an interface for an external third-party server to interact with the core network, and can interact with the core network through it, including interacting with the policy management framework for policy management.

In addition, although not shown, CN may also include other possible network elements, such as network exposure function (network exposure function, NEF) network element, unified data repository (unified data repository, UDR) network element, network data analysis function ( network data analytics function, NWDAF) network element.

In this embodiment of the present application, the terminal device includes a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via the wireless access network, and the terminal equipment can include user equipment (user equipment, UE), wireless terminal equipment, mobile terminal equipment, and device-to-device communication (device-to-device, D2D) Terminal equipment, vehicle to everything (V2X) terminal equipment, machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) ) terminal equipment, subscriber unit, subscriber station, mobile station, remote station, access point (access point, AP), remote terminal, access terminal, user terminal, user agent, or user equipment, etc. For example, it may include mobile phones (or "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer built-in mobile devices, and the like. For example, personal communication service (PCS) telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), and other devices; it can also include limited devices, such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities. In this application, UE is used to refer to terminal equipment in the following text.

This embodiment of the present application is applicable to a terminal device assigned a network slice type, for example, a mobile broadband (mobile broadband, MBB) product, or a CPE product included in an MBB product, and so on.

In order to facilitate understanding of the embodiments disclosed in the present application, the following two points are explained.

(1) The scenario in the embodiments disclosed in the present application is described by taking the scenario of the 5G new air interface (new radio, NR) network in the wireless communication network as an example. It should be pointed out that the solutions in the embodiments disclosed in the present application can also be applied In other wireless communication networks, corresponding names may also be replaced by names of corresponding functions in other wireless communication networks.

(2) Embodiments disclosed in the application will present various aspects, embodiments or features of the application around a system including a plurality of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. In addition, combinations of these schemes can also be used.

Secondly, a brief introduction is given to related concepts involved in the embodiments of the present application.

1. Network slicing.

Network slicing refers to the integration of 5G networks into different functional requirements (such as billing, policy control, security, mobility, etc.) and different performance requirements (such as delay, mobility, reliability, etc.) Multiple logical subnets with different characteristics and isolated from each other are virtualized on a set of physical devices. Thus, terminal devices can access network slices with different characteristics.

2. Terminal routing selection policy (UE route selection policy, URSP) code stream.

The URSP code stream is the code stream that the network device sends to the UE through signaling when the UE completes network registration, and is used for the UE to establish a protocol data unit session (protocol data unit session, PDU session).

As shown in Figure 2, a URSP code stream includes one or more URSP rules (URSP rule), each URSP rule includes a precedence value (precedence value), the precedence value of the URSP rule is used to indicate the order in which the UE uses the URSP rule , UE can determine the priority of URSP rule according to the precedence value of URSP rule. In addition, each URSP rule also includes a triplet information, and one or more sets of route selection (route selection). The triplet information includes an Internet Protocol (Internet Protocol, IP) address, protocol type, and port number. Each group of route selection includes a precedence value. The precedence value of the route selection is used to indicate the order in which the UE uses the route selection. The UE can determine the priority of the route selection according to the precedence value of the route selection. Each group of route selection also includes a network slice selection assistance information (NSSAI), a data network name (data network name, DNN)/Internet Protocol type (Internet Protocol type, IP_type). Each NSSAI includes one or more single network slice network slice selection assistance information (S-NSSAI).

Wherein, the S-NSSAI is shown in Figure 3, the S-NSSAI includes a first field for representing the type or service type (slice/service type, SST) of a single network slice, and the first field is 1 byte ( byte). At present, when the value of the first field is 1, it means that the network slice type or service type is enhanced mobile broadband (eMBB) type, and at this time, the first field can also correspond to 1 byte binary 00000001 ; When the value of the first field is 2, it means that the network slice type or service type is low-latency high-reliability communication (ultra-reliable&low-latency communication, URLLC) type, and the first field can also correspond to 1 byte at this time The binary value is 00000010; when the value of the first field is 3, it means that the network slice type or service type is a massive machine type communication (mMTC) type, and the first field can also correspond to 1byte binary 00000011.

In addition, the S-NSSAI also includes a second field for identifying a slice differentiator (slice differentiator, SD), the second field includes 3 bytes, and the SD is used to distinguish multiple network slices of the same SST. The SD is optional in the URSP code stream, that is, SD is included or not included in the URSP code stream.

Again, briefly describe the technical problem to be solved in this application.

At present, the establishment process of a PDU session based on network slicing is shown in Figure 4. The terminal device initiates a registration request to the network device, that is, requests to register with the network; Through CPOLICYRPT signaling, the URSP code stream is notified to the terminal device; thus, the terminal device parses out the triplet information and traffic descriptor (traffic descriptor) carried in the URSP code stream according to the protocol standard, and according to the URSP code stream in the URSP code stream The priority value of the rule and the priority value of the route selection sort the URSP rule and the route selection; the terminal device then selects the appropriate network slice in the order of high priority first and then low priority (that is, carrying the S- NSSAI network slicing) to establish a PDU session; after the terminal device uses a certain network slice to successfully establish a PDU session (that is, the dial-up is successful), it will send the triplet information corresponding to the network slice used to establish the PDU session to the routing process of the terminal device , in order to configure the network card information. In addition, after the terminal device parses the URSP code stream, the upper layer application of the terminal device obtains various types of NSSAI from the modem through the AT (Attention) command and the C5GNSSAIRDP command. The network slice selection auxiliary information configured by the terminal device (configure NSSAI), and the network slice selection auxiliary information rejected by the terminal device (reject NSSAI). The S-NSSAI parsed by the subsequent terminal device from the URSP code stream must be included in the allowed NSSAI.

When a terminal device establishes a PDU session using the above-mentioned network slice determined according to the priority of URSP rule and rote selection in the URSP code stream, the network slice used may not be suitable for the terminal device. Even if the PDU session is established successfully, the terminal device The problem that the network slicing cannot be used also causes waste of resources of the established PDU sessions. For example, the terminal device is an MBB product, the MBB product is a product of a specified service type, and only supports network slices of type eMBB. If the terminal device follows the protocol standard, the highest priority determined in the highest priority URSP stream The URSP rule and the network slice type corresponding to the rote selection with the highest priority in the URSP rule are uRLLC types, that is, the network slice corresponding to the rote selection with the highest priority in the URSP rule with the highest priority is not suitable for this MBB product. That is to say, even if the MBB product uses this network slice to successfully establish a PDU session, but the MBB product cannot use this network slice, or the communication efficiency is low when using this network slice for network communication, then the established PDU session will be blocked. Waste, that is, the waste of the PDU session resources.

The embodiment of the present application provides a network slice selection method 100 . In the network slice selection method 100, when the terminal device establishes a PDU session, it obtains the routing policy URSP code stream sent by the network device, and according to the first parameter and the corresponding SST field (first field), from the plurality of network slices, determine a network slice for establishing a PDU session, and establish a PDU session based on the determined network slice. The first parameter is a pre-configured parameter used to identify the network slice type applicable to the terminal device, so the network slice determined by the terminal device according to the first parameter and the SST field is a suitable network slice for the terminal device itself, that is, the terminal The device uses an appropriate network slice to establish a PDU session, which can avoid the waste of resources caused by the terminal device using an inappropriate network slice to establish a PDU session.

The embodiment of the present application also proposes a network slice selection method 200 when a terminal device initially registers successfully on a network and establishes a PDU session. The network slice selection method 200 is different from the network slice selection method 100 in that, before the terminal device initially establishes a PDU session based on the determined network slice, it can also configure dialing for each of the multiple routing options associated with the URSP Factor (dialup factor). Therefore, in the case where the first routing selection corresponding to the network slice used to establish the PDU session fails to establish a PDU session for all the second network slices, the terminal device subtracts the dialing factor corresponding to the first routing selection, which is not zero The second value of , wherein each second network slice is a network slice whose SST field matches the first parameter in the first routing selection. This method marks the first routing selection in which the terminal device fails to establish a PDU session using all the network slices applicable to the terminal device in the first routing selection, so that the dialing factor corresponding to the routing selection corresponding to the network slice that fails to establish a PDU session is different. The dialing factor corresponding to the route selection corresponding to the network slice where the PDU session is successfully established or the PDU session has not been established. Therefore, it is beneficial to improve the success rate of establishing a PDU session by selecting a network slice for establishing a PDU session according to the dialing factor selected by each route when the terminal device disconnects the established PDU session and establishes the PDU session again.

In addition, the embodiment of the present application also proposes a network slice selection method 300 for the terminal device when the established PDU session is disconnected, the network re-registration succeeds, and the PDU session is established. In the network slice selection method 300, when the terminal device disconnects the established PDU session and reconnects to the network, and the network where the terminal device is located has not changed, or the URSP code stream used to establish the PDU session has not changed, it is Based on the dialing factor corresponding to the route selection associated with the URSP code stream, or based on the dialing factor corresponding to the network slice associated with the URSP code stream, the network slice used to establish the PDU session is determined from multiple network slices. This method can prevent the terminal device from establishing a PDU session by using a failed route selection or network slicing before the established PDU session is disconnected, thereby improving the efficiency of the terminal device in establishing a PDU session.

The embodiment of this application proposes a network slice selection method 100 . FIG. 5 is a schematic flowchart of the network slice selection method 100 . The network slice selection method 100 is described from the perspective of a terminal device. The network slice selection method 100 includes but not limited to the following steps:

S101. The terminal device obtains the routing policy (URSP) code stream sent by the network device.

S102. The terminal device determines the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field. The first parameter is the network slice with the terminal The pre-configured parameters associated with the device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is used in the URSP code stream to identify the type of each network slice in the multiple network slices associated with the URSP code stream field.

As can be seen from the above and Figure 2, the URSP code stream includes multiple URSP rules, each URSP rule includes multiple groups of routing options, each group of routing options includes an NSSAI, and the NSSAI includes one or more S-NSSAI, so the NSSAI Corresponds to one or more network slices, so the URSP code stream is associated with multiple network slices.

In an optional embodiment, the URSP code stream includes multiple URSP rules with different priorities, and each URSP rule includes multiple routing options with different priorities, and the priority of each URSP rule is based on the priority of each URSP rule. The value is determined, and the priority of each route selection is determined according to the priority value of each route selection. Therefore, the terminal device determines the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, specifically, the terminal device According to the priority of the URSP rule and the priority of routing selection, the first network slice is selected from the multiple network slices associated with the URSP code stream in order of priority from high to low; the SST field of the first network slice and the first If the parameters match, the first network slice is determined as the network slice used to establish the PDU session.

Understandably, according to the priority of the URSP rule and the priority of the routing selection, the terminal device determines the multiple network slices corresponding to the routing selection with the highest priority in the URSP rule with the highest priority. If the routing selection with the highest priority corresponds to The SST field of the first network slice in the multiple network slices matches the first parameter, that is, the network slice type indicated by the SST field of the first network slice is the same as the network slice type identified by the first parameter, then the first network slice is Network slice used by end devices to establish PDU sessions.

In addition, when the SST field of the first network slice does not match the first parameter, the terminal device checks whether the SST field of the fourth network slice after the first network slice matches the first parameter in order of priority from high to low. A parameter matching, when the SST field of the fourth network slice matches the first parameter, determine the SST field of the fourth network slice as the network slice for establishing the PDU session.

When the SST field of each network slice corresponding to the route with the highest priority does not match the first parameter, the terminal device determines the multiple networks corresponding to the route with the second highest priority in the URSP rule with the highest priority slice, if the SST field of the fifth network slice among the multiple network slices corresponding to the route with the second highest priority matches the first parameter, then the fifth network slice is the network slice used by the terminal device to establish the PDU session. When the SST field of each network slice corresponding to the route with the second highest priority does not match the first parameter, the terminal device continues to determine the route with lower priority in the URSP rule with the highest priority For the corresponding multiple network slices, until the SST field of a certain network slice in the multiple network slices matches the first parameter, determine the network slice for establishing the PDU session.

When the terminal device traverses all the network slices corresponding to the route selection in the URSP rule with the highest priority, and none of the network slices used to establish the PDU session is determined, the terminal device continues to follow the priority in the URSP rule with the second highest priority. Traverse each routing selection in the URSP rule with the second highest priority from high to low until the network slice used to establish the PDU session is determined.

Wherein, the terminal device determines whether the SST field matches the first parameter according to the above byte (ie, the first field) used to represent the SST field. That is to say, after the terminal device determines a plurality of network slices corresponding to a route selection, if the network slice type indicated by the SST field of the first network slice among the multiple network slices is the same as the network slice type identified by the first parameter , then the first network slice is a network slice used to establish a PDU session.

Exemplarily, the URSP code stream received by the terminal device includes URSP rule#1 with priority A and URSP rule#2 with priority B. URSP rule#1 includes route selection#1 with priority A, route selection#2 with priority B, route selection#3 with priority C, route selection#1 includes network slice A, and route selection#2 includes network Slice B and network slice C. URSP rule#2 with priority B includes route selection#4 with priority B and route selection#5 with priority C. The priority of A is higher than the priority of B, and the priority of B is higher than the priority of C. When the terminal device establishes a PDU session, it determines that the URSP rule with the highest priority in the URSP code stream is URSP rule#1, and the route selection with the highest priority in URSP rule#1 is route selection#1, then determine the route selection#1 The SST field of the network slice A is used to indicate whether the network slice type is the same as the network slice type identified by the first parameter. For example, if the network slice type identified by the first parameter is eMBB type, and the value of the SST field of network slice A is 2, then the network slice type corresponding to network slice A is uRLLC type, that is, the SST field of network slice A is the same as the first The parameters do not match, and network slice A is not the network slice for establishing the PDU session. Then, the terminal device continues to judge whether the SST field of each network slice in route selection#2 with the second highest priority in URSP rule#1 matches the first parameter. If the value of the SST field of network slice C is 1, the network The network slice type of slice C is eMBB type, that is, the SST field of network slice C matches the first parameter, then network slice C is a network slice applicable to terminal devices, and is also a network slice used to establish a PDU session.

In an optional implementation manner, the terminal device obtains the routing policy (URSP) code stream sent by the network device, which may specifically include: the terminal device initiates a registration request to the network device, and when the registration is successful, receives the URSP code stream from the network device flow. Thereby, the terminal device parses the URSP code stream, and obtains the priority of each URSP rule in the URSP code stream and the priority of the route selection included in each URSP rule.

S103. The terminal device establishes a PDU session based on the network slice used to establish the PDU session.

In an optional implementation manner, when the terminal device successfully establishes the PDU based on the network slice used to establish the PDU session, it sends the triplet information corresponding to the network slice to the routing process of the terminal device, so that the routing process Configure the network card information so that the terminal device can use the network slice.

In the embodiment of this application, when the terminal device establishes the PDU session, it is established based on the network slice determined by the first parameter used to identify the network slice type applicable to itself and the SST fields corresponding to the multiple network slices associated with the URSP code stream. . Therefore, end devices are PDU sessions established with appropriate network slices. When the PDU session is established successfully, the terminal device can use the network slice, thereby avoiding resource waste caused by the terminal device establishing a PDU session by using an inappropriate network slice.

The embodiment of the present application also proposes a network slice selection method 200 when a terminal device initially registers successfully on a network and establishes a PDU session. FIG. 6 is a schematic flowchart of a network slice selection method 200 . The network slice selection method 200 includes but not limited to:

S201. When the terminal device completes network registration for the first time, acquires a routing policy (URSP) code stream sent by the network device.

S202. The terminal device determines the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field. The first parameter is the network slice with the terminal The pre-configured parameters associated with the device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is used in the URSP code stream to identify the type of each network slice in the multiple network slices associated with the URSP code stream field.

For the implementation manners of S201 and S202, reference may be made to the above implementation manners of S101 and S102, and details are not repeated here.

S203a. The terminal device configures a dialing factor for each of the multiple routings associated with the URSP code stream, and the initial value of the dialing factor is a first value; the first value is a real number.

Understandably, the embodiment of the present application does not limit the execution order of S203a, S201, and S202. That is to say, S203a may also be executed before S201, or may also be executed between S201 and S202.

It can be known from the above that the URSP code stream includes multiple sets of routing options, so the URSP code stream is associated with multiple sets of routing options.

The terminal device will pre-configure a dial factor for each group of routing, and the initial value of each dial factor is the first value. The first value may be any value, for example, the first value is 0, 1, and so on. That is, there is a dialing factor for each group of routing options in the URSP code stream.

S204. The terminal device establishes a PDU session based on the network slice used to establish the PDU session.

S205. In the first routing selection corresponding to the network slice used to establish the PDU session, if all the second network slices fail to establish the PDU session, the terminal device subtracts the dialing factor of the first routing selection from zero the second value of . The second network slice is a network slice whose SST field matches the first parameter in the first routing selection.

The second value is any value that is not zero, for example, the second value is -1, 0, 2, and so on.

It can be understood that the routing selection to which the network slice used to establish the PDU session belongs is the first routing selection. When the terminal device fails to establish a PDU session based on the first network slice corresponding to the first routing, continue to use the network slice corresponding to the first routing whose SST field matches the first parameter to establish a PDU session. When the terminal device fails to establish a PDU session for all network slices whose SST field matches the first parameter based on the first route selection, it subtracts the second value from the dialing factor of the first route selection, that is, the terminal device selects the first route based on the first parameter. In this method, when all network slices applicable to the terminal device fail to establish PDU sessions, the dialing factor selected by the first route is subtracted from the second value.

This method is beneficial to improve the success rate of establishing the PDU session according to the dialing factor selected by each route when the terminal device disconnects the established PDU session and establishes the PDU session again. For example, the terminal device does not determine the network slice used to establish the PDU session from the routing with the dial factor being the third value, and the third value is the value obtained by subtracting the second value from the first value, that is, the terminal device does not determine the network slice used to establish the PDU session from the When the PDU session is established before the PDU session is disconnected, the network slice for re-establishing the PDU session is determined in the routing selection of the unsuccessful PDU session establishment, so that the success rate of the PDU session establishment can be improved.

Exemplarily, the terminal device determines that the URSP rule with the highest priority is URSP rule#1 according to the priority of the URSP rule and the priority of routing selection, and the routing selection with the highest priority in URSP rule#1 is routing #a, Routing #a includes network slice A, network slice B, and network slice C. The network slice types indicated by the SST field of network slice A and network slice C are the same as the network slice type identified by the first parameter, and the network slice type indicated by the SST field of network slice B is different from the network slice type identified by the first parameter. Then, the terminal device first determines that network slice A is a network slice for establishing a PDU session. When the terminal device fails to establish the PDU session by using the network slice A, it determines that the network slice C is a network slice for establishing the PDU session. If the terminal device fails to establish a PDU session using network slice C, it means that the terminal device fails to establish a PDU session using the network slice applicable to the terminal device in routing #a. At this time, the terminal device subtracts the dialing factor of routing #a from the first binary value.

In an optional implementation manner, after executing S201, the terminal device further includes: the terminal device parses the URSP code stream, and obtains the priority of each URSP rule in the URSP code stream and the priority of the route selection included in each URSP rule .

Refer to FIG. 7 for an implementation block diagram of the embodiment of the present application. As shown in Figure 7, when the terminal device completes the network registration for the first time, it parses the URSP code stream from the network device, and determines the priority of each URSP rule and the priority of each route selection in the URSP code stream. The terminal device configures a dialing factor for each route associated with the URSP code stream, and the initial value of the dialing factor is the first value. The terminal device then determines the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, that is, according to the applicable network of the terminal device The slice type determines the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream. If the terminal device uses the determined network slice to successfully establish the PDU, the dial factor of the route selection corresponding to the network slice is stored locally, that is, the dial factor of the route selection corresponding to the network slice is not processed; if the terminal device adopts the determined If the PDU fails to be established for the network slice, the second value is subtracted from the value of the dialing factor of the route selection corresponding to the network slice, and again according to the first parameter and the slice or service type (SST) field, from the associated URSP stream Among multiple network slices, determine the network slice used to establish the protocol data unit PDU session until the terminal device successfully establishes the PDU session.

In another implementation manner, the terminal device does not process the initial configuration value (first value) of the dialing factor of the route selection corresponding to the route selection corresponding to the network slice adopted when the PDU session is established successfully. For an unused network slice, the value of the dialing factor of the route selection corresponding to the network slice is also an initial value (first value).

In the embodiment of the present application, when the terminal device completes network registration for the first time, it obtains the routing policy (URSP) code stream sent by the network device; according to the first parameter used to identify the network slice type applicable to the terminal device, and the URSP code stream The SST fields corresponding to the associated multiple network slices determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP stream; and configure a dial factor for each routing associated with the URSP stream ; Therefore, in the first routing selection corresponding to the network slice used to establish the PDU session, if the second network slice applicable to the terminal device fails to establish the PDU session, the dialing factor of the first routing selection is reduced by Go to the second value that is not zero. Therefore, it is beneficial for the terminal device to establish the PDU session according to the dialing factor selected by the route when the established PDU session fails and to establish the PDU session again, thereby improving the success rate of the terminal device for re-establishing the PDU session.

Exemplarily, it is assumed that the URSP code stream received by the terminal device is associated with five routing options, such as routing #a, routing #b, routing #c, routing #d, and routing #e. The terminal device configures a dialing factor for each of the five routing options associated with the URSP. The initial value (ie, the first value) of the dialing factor is preset as 1, and the second value is preset as 1. Then, when the terminal device adopts the route selection #a among the 5 routes, all network slices whose SST matches the first parameter fail to establish a PDU session, the dial factor corresponding to the route selection #a will be set in the initial configuration value (that is, the first value, which is 1), the second value is subtracted, so that the dialing factor of the routing #a becomes 1-1=0. However, the dial factors corresponding to routing #b, routing #c, routing #d, and routing #e are still the initial configuration values (ie, the first value, which is 1). Therefore, it is beneficial for the terminal device to establish a PDU session again after the established PDU session is disconnected. According to the value of each dial factor, it can select the route from the network slice corresponding to the network slice that failed to establish the PDU session before the PDU session was disconnected# a (i.e., from the routing selection whose dialing factor is 1), that is, from routing #b, routing #c, routing #d, routing #e, select a network slice suitable for the terminal device, Re-establishing the PDU session can prevent the terminal device from re-establishing the PDU session by using the routing #a of the network slice that failed to establish the PDU session before, thereby improving the efficiency of the terminal device in establishing the PDU session.

In addition, the terminal device will not attempt to establish a PDU session multiple times using the route selection corresponding to the network slice that failed to establish a PDU session before, so that the network device will not reject the terminal device to establish a PDU session multiple times for the unsuccessful network slice, and then There is no risk of network devices detaching terminal devices, that is, there is no network device that considers a terminal device that has repeatedly attempted to establish a PDU session with unsuccessful network slicing to be an untrusted terminal device, thereby marking the terminal device as a dangerous terminal device, and thus the terminal device cannot request registration from the network device.

In an optional implementation manner, if the terminal device successfully establishes a PDU by using a determined network slice, add a third value to the dialing factor of the route selection corresponding to the network slice, that is, add the first value corresponding to the route selection to The third value, the third value is any value that is not zero; if the terminal device is based on the first route selection corresponding to the network slice used to establish the PDU session, all the second network slices fail to establish the PDU session, The dial factor selected by the first route is stored locally, that is, the dial factor selected by the first route is not processed. The embodiment of the present application does not limit the specific processing operation performed on the dialing factor of the route selection corresponding to the network slice when the terminal device succeeds or fails to establish the PDU by using the determined network slice.

In another optional implementation manner, the above S203a may be replaced by the following S203b.

S203b: The terminal device configures a dialing factor for the network slice whose SST field matches the first parameter among the multiple network slices associated with the URSP code stream. The initial value of each dialing factor is the first value, and the first value is a real number.

It can be understood that the network slice whose SST field matches the first parameter belongs to the network slice applicable to the terminal device. That is to say, the terminal device configures the dialing factor for the network slice whose network slice type is a network slice type applicable to the terminal device. The dialing factor is used to mark the network slice applicable to the terminal device in the network slice associated with the URSP code stream. However, the terminal device does not configure the dialing factor for the network slices whose network slice type does not belong to the network slice type applicable to the terminal device among the multiple network slices associated with the above URSP code stream.

Exemplarily, the network slices associated with the URSP stream include network slice A, network slice B, network slice C, and network slice D. The network slice types indicated by the SST fields of network slice A, network slice C, and network slice D are the same as the first If the types of network slices identified by the parameters are the same, the terminal device configures a dialing factor for each network slice in network slice A, network slice C, and network slice D, and the initial value of the dialing factor is 2.

Then, when the terminal device disconnects the established PDU session and re-establishes the PDU session, and the network where the terminal device is located or the URSP code stream for establishing the PDU has not changed, the terminal device will follow the priority of the URSP rule and the priority of the route selection Select the third network slice configured with the dialing factor in order of priority from high to low, and determine whether the third network slice is a network slice for establishing a PDU session according to the dialing factor of the third network slice. It can be seen that the terminal device does not need to judge again whether the SST field of the third network slice matches the first parameter, thereby improving the efficiency of re-establishing the PDU session of the terminal device.

In yet another optional implementation manner, the above S203a and S205 are not executed, and the following S206 is executed after S204.

S206: When the terminal device successfully establishes the PDU session based on the network slice used to establish the PDU session, configure a dialing factor for the adopted network slice, where the value of the dialing factor is a first value, and the first value is a real number.

In this method, the dialing factor is used to mark the network slice associated with the URSP code stream, the network slice that is applicable to the terminal device and the network slice that successfully establishes the PDU session, that is, the network slice configured with the dialing factor is not only a network slice applicable to the terminal device, It is also a network slice where the terminal device successfully establishes a PDU session. A network slice that is not configured with a dial factor is a network slice that is not applicable to the terminal device, or a network slice that is applicable to the terminal device, but it is also a network slice that the terminal device uses when it fails to establish a PDU session.

It can be understood that in this embodiment, the terminal device only adds a dialing factor to the network slice when the network slice determined according to the first parameter and the SST field is used to successfully establish a PDU session, that is, the dialing factor is marked by the dialing factor A network slice is a network slice applicable to a terminal device, and it is also a network slice for a terminal device to successfully establish a PDU session. Then, when the terminal device disconnects the established PDU session and establishes the PDU session again, and the network where the terminal device is located or the code stream for establishing the PDU has not changed, the terminal device can directly use the network slice marked with the dial factor to establish PDU session. When the terminal device uses the network slice to establish a PDU session, the PDU session can be successfully established, thereby preventing the terminal device from establishing a PDU session using the previously unsuccessful network slice, thereby significantly improving the probability of the terminal device successfully establishing a PDU session again.

When the location of the terminal device changes or the network of the terminal device is unstable, the terminal device may be disconnected from the network device, that is, the established PDU session of the terminal device is disconnected. At this point, the terminal device needs to re-initiate the network registration request, and re-initiate the establishment of the PDU session when the network registration is successful. Therefore, the embodiment of the present application proposes a network slice selection method 300 for establishing a PDU session when the established PDU session is disconnected and the network re-registration succeeds. FIG. 8 is a schematic flowchart of the network slice selection method 300. The network slice selection method 300 includes but is not limited to:

S301. When the terminal device disconnects the established PDU session and reconnects to the network, determine whether the network where the terminal device is located changes, or whether the URSP code stream used to establish the PDU session changes.

After the PDU session is disconnected, the geographic location of the terminal device changes, which may cause the network where the terminal device is located to change, for example, the cell where the terminal device is located changes, and the base station accessed changes. When the network of the terminal device changes, the terminal device will receive the URSP code stream from the network device again, and the URSP code stream may be the same as or different from the URSP code stream of the terminal device before the disconnection of the established PDU session .

In an optional implementation manner, the terminal device determines whether the network where the terminal device is located changes according to the IP address of the network to which the terminal device is connected. When the IP address of the network that the terminal device can connect to has not changed, it indicates that the network where the terminal device is located has not changed; when the IP address that the terminal device can connect to changes, it indicates that the network where the terminal device is located has changed.

In an optional implementation, the terminal device receives the URSP code stream from the network device when the established PDU session is disconnected and reconnects to the network. At this time, the terminal device combines the URSP code stream with the established PDU session Compare the URSP code stream used before disconnection. If the received URSP code stream is the same as the URSP code stream used before the established PDU session was disconnected, the terminal device determines that the URSP code stream used to re-establish the PDU session has not changed; if the received URSP code stream is the same as If the URSP code stream used before the disconnection of the established PDU session is different, the terminal device determines that the URSP code stream used when establishing the PDU session again changes.

In another optional implementation, the terminal device does not receive the URSP code stream from the network device when the established PDU session is disconnected and reconnected to the network. At this time, the terminal device determines the URSP code stream of the currently established PDU session There is no change, that is, the terminal device can continue to use the URSP code stream used before the disconnection of the established PDU session to re-establish the PDU session.

S302. When the network where the terminal device is located or the URSP code stream used to establish the PDU session does not change, the terminal device selects the route associated with the URSP code stream or the dialing factor of the associated network slice from the URSP code stream associated Among the multiple network slices, the network slice used to establish the PDU session is determined.

Understandably, if the network where the terminal device is located or the URSP code stream used to establish the PDU session has not changed, the URSP code stream used by the terminal device before the established PDU session is disconnected can continue to be used, and the terminal device The network slice used to establish the PDU session can be determined from multiple network slices associated with the URSP according to the dialing factor of the routing selection associated with the URSP code stream, or the dialing factor of the associated network slice. That is to say, when the terminal device establishes a PDU again, it no longer only determines the network slice used to establish the PDU session from multiple network slices according to the priority of each URSP rule and the priority of each route selection in the URSP code stream. It also refers to the dialing factor of each route selection, or the dialing factor of each network slice, so that the routing or network slicing used by the terminal device when establishing a PDU session before can be referred to, which is beneficial to the terminal device not using the previous PDU session establishment. The route selection or network slicing used to establish the PDU session when successful can improve the efficiency of the terminal device successfully establishing the current PDU session.

In the following, several implementations of determining the network slice used to establish the PDU session from multiple network slices according to the routing selection associated with the URSP code stream or the dialing factor of the network slice are described below in conjunction with different situations of the above-mentioned second value.

1. The second value is a positive number.

1.1, Case 1.

The above-mentioned second value is a positive number, and when the terminal device initially accesses the network to establish a PDU session, it configures the dialing factor for each group of routing selections in the multiple routings associated with the URSP code stream, then the above-mentioned terminal device is associated with the URSP code stream The dialing factor of routing selection, the network slice used to establish the PDU session is determined from the multiple network slices associated with the URSP code stream, which refers to the URSP code stream used to establish the PDU session on the network where the terminal device is located or at the current moment When there is no change, according to the priority of the URSP rule and the priority of the route selection, determine the second route selection in order of priority from high to low. When the dial factor of the second route selection is greater than the first threshold, start from the second Selecting a third network slice among the plurality of network slices associated with routing; in the case where the SST field of the third network slice matches the first parameter, determining the third network slice as the network slice used to establish the PDU session .

Wherein, the first threshold may be preset by the terminal device. The second value is a positive number and the value of the dialing factor of the routing selection is greater than the first threshold, which can indicate that the number of times the terminal device fails to establish a PDU session using the network slice in the routing selection is within a certain range before the PDU session is disconnected. The device adopts the network slice in the route selection to establish a PDU session with a higher probability of success, and the terminal device can still use the network slice in the route selection to establish the PDU session. Therefore, when the dialing factor of the second routing selection is greater than the first threshold, the terminal device selects a network slice for establishing a PDU session from multiple network slices associated with the second routing selection.

When the value of the dialing factor of the route selection is less than the first threshold, it indicates that the number of times the terminal device fails to establish a PDU session using the network slice associated with the route selection exceeds a certain range before the established PDU session is disconnected, that is, the number of failures If there are too many, it may be considered as an untrustworthy terminal device by the network device. If the terminal device uses the network slice associated with the routing to establish a PDU session again, there will be a risk of being detach by the network device, that is, the terminal device will no longer be able to access In the network corresponding to the network slice in the route selection. Therefore, when the value of the dialing factor of a routing is smaller than the first threshold, the terminal device will not use the network slice associated with the routing to establish a PDU session.

For example, the first value is 2 and the second value is 1. If the terminal device fails to establish a PDU session using all network slices applicable to itself in routing #a when initially establishing a PDU session, then the value of the dialing factor of routing #a is the first value minus the second value, that is 2-1 equals 1. Then, when the terminal device establishes a PDU session again, it determines the network slice used to establish the PDU session according to the priority of the URSP rule, the priority of routing selection, and the dialing factor of routing selection. Understandably, the terminal device determines the highest priority routing in the highest priority URSP rule, and in the case that the dialing factor of the highest priority routing is greater than 1 (first threshold), it is determined that the highest priority The network slice used to establish the PDU session is determined in the route selection of the route, that is, among the network slices included in the route selection with the highest priority, the network slice whose SST field matches the first parameter is the network slice used to establish the PDU session. Therefore, the terminal device does not establish a PDU session by using the network slice in the routing selection (routing #a) used when the PDU session failed to be established before, which can improve the success rate of the terminal device to establish a PDU session again.

1.2, Case 2.

The above-mentioned second value is a positive number, and when the terminal device initially accesses the network to establish a PDU session, among the network slices associated with the URSP code stream, the network slice type belongs to the network slice type applicable to the terminal device. dialing factor, the above-mentioned terminal device selects the network slice used to establish a PDU session from multiple network slices according to the dialing factor of multiple network slices associated with the URSP code stream, which means: the network where the terminal device is located or the current When the URSP code stream used to establish the PDU session has not changed at all times, according to the priority of the URSP rule and the priority of routing selection, select the third network slice configured with the dial factor in the order of priority from high to low; When the dialing factor of the third network slice is greater than the first threshold, the third network slice is determined as the network slice for establishing the PDU session.

2. The second value is a negative number.

2.1, Case 3.

The above-mentioned second value is a negative number, and when the terminal device initially accesses the network to establish a PDU session, each group of routing selections associated with the URSP code stream is configured with a dialing factor, then the above-mentioned terminal device configures the dialing factor according to the route associated with the URSP code stream The selected dialing factor determines the network slice used to establish the PDU session from multiple network slices, which means: when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, according to The priority of the URSP rule and the priority of the route selection, determine the second route selection according to the order of priority from high to low, when the dial factor of the second route selection is less than the first threshold, select the multiple associated routes from the second route In the network slice, select the third network slice; if the SST field of the third network slice matches the first parameter, determine the third network slice as the network slice for establishing the PDU session.

When the second value is a negative number, and the terminal device fails to establish a PDU session using a network slice applicable to a certain routing selection, the dialing factor of the routing selection used is subtracted from the second value, and the obtained value is a positive value, That is, the routing selection corresponding to the dialing factor whose value of the dialing factor is greater than the initial value at this time is the routing selection adopted when the PDU session failed to be established before. Then, only the value less than the first value minus the second value is the route not used by the terminal device or the route adopted when the PDU session is established successfully. Therefore, the terminal device determines that the network slice whose SST field matches the first parameter is the network slice used to establish the PDU session among the multiple network slices associated with the second routing whose dialing factor value is less than the first threshold.

For example, the first value is 2, and the first value is -1. If the terminal device fails to establish a PDU session using all applicable network slices in routing #a when initially establishing a PDU session, then the value of the dialing factor of routing #a is the first value minus the second value, which is 2 -(-1) is equal to 3, then when the terminal device establishes a PDU session again, first determine the second route selection according to the priority of the URSP rule and the priority of the route selection, and when the dialing factor of the determined second route selection is less than 3 In the case of (the first threshold value), the network slice used to establish the PDU session is determined from the multiple network slices in the second routing selection, so that the terminal device does not use the routing selection used when the previous establishment of the PDU session failed, It can improve the success rate of re-establishing the PDU session of the terminal device.

2.2, Case 4.

The above-mentioned second value is a negative number, and when the terminal device initially accesses the network to establish a PDU session, among the network slices associated with the URSP code stream, the network slice type belongs to the network slice type applicable to the terminal device. Add a dial factor, the above-mentioned terminal device selects the network slice for establishing a PDU session from multiple network slices according to the dialing factor of multiple network slices associated with the URSP code stream, which means: in the network where the terminal device is located or at the current moment When the URSP code stream used to establish the PDU session has not changed, according to the priority of the URSP rule and the priority of routing selection, select the third network slice configured with the dial factor in the order of priority from high to low; When the dialing factor of the three network slices is smaller than the first threshold, the third network slice is determined as the network slice for establishing the PDU session.

3. Regardless of whether the second value is positive or negative.

3.1, Case 5.

Regardless of whether the above-mentioned second value is a positive number or a negative number, if the terminal device configures a dialing factor for each group of multiple routing selections associated with the URSP code stream when it initially accesses the network to establish a PDU session, the above-mentioned terminal device configures the dialing factor according to the URSP The dialing factor of the routing selection associated with the code stream determines the network slice used to establish the PDU session from multiple network slices. When a change occurs, according to the priority of the URSP rule and the priority of the routing, determine the second routing according to the order of priority from high to low. When the dialing factor of the second routing is equal to the first value, the second routing Selecting a third network slice among multiple associated network slices; in the case that the SST field of the third network slice matches the first parameter, determining the third network slice as the network slice for establishing the PDU session.

3.2, Case 6.

Regardless of whether the above-mentioned second value is a positive number or a negative number, if the terminal device initially accesses the network to establish a PDU session, among the network slices associated with the URSP code stream, the network slice type belongs to the network slice type applicable to the terminal device If a dialing factor is added, the above-mentioned terminal device determines the network slice used to establish a PDU session from multiple network slices according to the dialing factor of multiple network slices associated with the URSP code stream. When the network or the URSP code stream used to establish the PDU session at the current moment does not change, according to the priority of the URSP rule and the priority of routing selection, select the third network configured with the dial factor in the order of priority from high to low Slicing: when the dialing factor of the third network slice is equal to the first value, determine the third network slice as the network slice for establishing the PDU session.

Since the terminal device uses the dialing factor to mark the network slices associated with the URSP stream before the established PDU session is disconnected, it is suitable for the network slice of the terminal device, so the network slice with the dialing factor of the first value is the network slice that the terminal device does not The network slice that is used and applicable to the terminal device, or the network slice that successfully establishes the PDU session and is applicable to the terminal device. Therefore, the terminal device selects the network slice for establishing the PDU session from the network slices whose dialing factor is the first value according to the priority of the URSP rule and the priority of routing selection, so that the terminal device can use the network slice that is suitable for the terminal device. The network slicing also establishes the PDU session for the network slice that has not failed to establish the PDU session before, so that the success rate of re-establishing the PDU session for the terminal device can be improved.

In another optional implementation manner, if the terminal device initially accesses the network to establish a PDU session, a dialing factor is added to the network slice used when the PDU session is established successfully, and the URSP code stream of the terminal device does not change. , when the PDU session is established again, the network slice configured with the dial factor can be directly used to establish the PDU session, thereby improving the success rate of the terminal device establishing the PDU session, and preventing the terminal device from repeatedly establishing the PDU session using the previously unsuccessful network slice.

S303. The terminal device establishes a PDU session based on the network slice.

In an optional implementation manner, when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment changes, the terminal device clears the value of each dial factor, and executes according to the first parameter, and The slice or service type (SST) field determines the steps for establishing the network slice for the protocol data unit PDU session from the multiple network slices associated with the URSP code stream.

That is to say, when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment changes, the terminal device will not use the established PDU session when it connects to the network again after the PDU session is disconnected. If the routing or network slicing is adopted, the network slice marked with the dialing factor by the terminal device is not applicable, so the terminal device needs to clear the value of the dialing factor of each routing or network slice, so that the terminal device uses the new A PDU session is established between the URSP code stream and the network slice associated with the URSP code stream.

In addition, reference may be made to FIG. 9 for an implementation block diagram of the embodiment of the present application. It can be seen from Figure 9 that when the established PDU session is disconnected and the network registration is completed again, the terminal device parses the URSP code stream from the network device, and then determines the location of the terminal device after parsing the URSP code stream. Whether the network changes, or whether the URSP code stream used to establish the PDU session changes. If the terminal device determines that the network where it is located has not changed, or the URSP used to establish the PDU session has not changed, then determine the priority of each URSP rule and the priority of each route selection in the URSP code stream used to establish the PDU session, According to the priority of each URSP rule, the priority of each route selection, and the dialing factor of routing selection or network slice, determine the network slice used to establish the PDU session, and use the determined network slice to establish the PDU session. When the PDU session is successfully established, the terminal device stores the adopted network slice or the dialing factor of the routing to which the adopted network slice belongs, that is, does not process the dialing factor of the network slice or the dialing factor of the routing to which the network slice belongs ; When the terminal device adopts a route selection and all network slices applicable to the terminal device fail to establish PDU sessions, the value of the dialing factor of the route selection used is subtracted from the second value to record that the failure to establish the PDU session is the route adopted choose.

If the terminal device determines that the network it is in has changed, or the URSP used to establish the PDU session has changed, the terminal device will clear all the dialing factor values, and perform the determination of the priority of each URSP rule and each route selection in the URSP code stream priority steps.

In the implementation of this application, when the terminal device disconnects the established PDU session and reconnects to the network, and the network where the terminal device is located has not changed, or the URSP code stream used to establish the PDU session has not changed, it is based on network slicing The dialing factor of the routing selection associated with the URSP code stream, or the dialing factor of the associated network slice, determines the network slice used to establish the PDU session from multiple network slices, which can prevent the terminal device from disconnecting the established PDU session The previously adopted failed route selection or network slicing establishes the PDU session, thereby improving the efficiency of the terminal device in establishing the PDU session.

In order to realize the various functions in the method provided by the above embodiments of the present application, the terminal device may include a hardware structure and/or a software module, and realize the above-mentioned functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

As shown in FIG. 10 , the embodiment of the present application provides a communication device 1000 . The communication apparatus 1000 may be a component of a terminal device (for example, an integrated circuit, a chip, etc.). The communication device 1000 may also be another communication unit, configured to implement the method in the method embodiment of the present application. The communication device 1000 may include: a communication unit 1001 and a processing unit 1002 . Optionally, a storage unit 1003 may also be included.

In a possible design, one or more units in Figure 10 may be implemented by one or more processors, or by one or more processors and memory; or by one or more processors and a transceiver; or by one or more processors, memories, and a transceiver, which is not limited in this embodiment of the present application. The processor, memory, and transceiver can be set independently or integrated.

The communication device 1000 has the function of realizing the terminal device described in the embodiment of this application. For example, the communication device 1000 includes a terminal device that executes the modules or units or means (means) corresponding to the steps involved in the terminal device described in the embodiments of this application, and the functions, units or means (means) can be implemented by software, or by Hardware implementation may also be implemented by executing corresponding software through hardware, or may also be implemented through a combination of software and hardware. For details, further reference may be made to the corresponding descriptions in the aforementioned corresponding method embodiments.

In a possible design, the communication device 1000 may include:

The processing unit 1002 is configured to obtain the routing policy (URSP) code stream sent by the network device;

The processing unit 1002 is further configured to determine the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field , wherein the first parameter is a pre-configured parameter associated with the terminal device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is the A field for identifying the type of each network slice in the multiple network slices associated with the URSP code stream;

The processing unit 1002 is further configured to establish a PDU session based on the network slice used for establishing the PDU session.

In an optional implementation manner, the URSP code stream includes URSP rules with different priorities, and each of the URSP rules includes routing options with different priorities; the processing unit 1002 according to the first parameter, and slice or service The type (SST) field, from the multiple network slices associated with the URSP code stream, determines the network slice used to establish the PDU session, specifically for: according to the priority of the URSP rule and the priority of the routing selection , selecting a first network slice from the plurality of network slices associated with the URSP code stream in order of priority from high to low; when the SST field of the first network slice matches the first parameter , determining the first network slice as the network slice used to establish the PDU session.

In an optional implementation manner, the processing unit 1002 is further configured to: configure a dialing factor for each group of routings in the multiple groups of routings associated with the URSP code stream, and the initial value of the dialing factor is the first A value; the first value is a real number; in the first routing selection corresponding to the network slice used to establish the PDU session, if each second network slice fails to establish a PDU session, the first A dialing factor of routing, minus a second value that is not zero; the second network slice is a network slice in the first routing whose SST field matches the first parameter.

In another optional implementation manner, the processing unit 1002 is further configured to: among the multiple network slices associated with the URSP, configure a dialing factor for the network slice whose SST field matches the first parameter, The initial value of the dialing factor is a first value; the first value is a real number; in the case of failure to establish a PDU session based on the network slice used to establish a PDU session, use the The dialing factor of the network slice, minus a second non-zero value.

In yet another optional implementation manner, the processing unit 1002 is further configured to: if the establishment of the PDU session based on the network slice used for establishing the PDU session succeeds, for the network slice used for establishing the PDU session The dialing factor is configured for the network slice, and the initial value of the dialing factor is a first value; the first value is a real number.

In an optional implementation manner, the processing unit 1002 is further configured to: when the established PDU session is disconnected and the network is reconnected, determine whether the network where the processing unit is located changes, or the current Whether the URSP code stream used to establish the PDU session changes at any time; when the network where the terminal device is located or the URSP code stream used to establish the PDU session currently does not change, according to the routing rules associated with the URSP code stream The dial factor, or the dial factor of the associated network slice, determines the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream; establishes the PDU based on the network slice used to establish the PDU session session.

In an optional implementation manner, the second numerical value is a positive number; when the network where the processing unit is located or the URSP code stream used to establish the PDU session at the current moment does not change, the processing unit 1002, according to The dialing factor of the routing rule associated with the URSP code stream is used to determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, specifically for: the network where the processing unit is located or When the URSP code stream used to establish the PDU session at the current moment has not changed, according to the priority of the URSP rule and the priority of the routing, select the second routing according to the order of priority from high to low; When the dialing factor of the second routing selection is greater than the first threshold, select a third network slice from the plurality of network slices associated with the second routing selection; the SST field of the third network slice and the first If the parameters match, determine the third network slice as the network slice used to establish the PDU session.

In another optional implementation manner, when the network where the processing unit is located or the URSP code stream used to establish the PDU session at the current moment has not changed, the processing unit 1002, according to the route associated with the URSP code stream The regular dialing factor, which is used to determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, is specifically used for: the network where the terminal device is located or the current time used to establish the PDU session When the URSP code stream does not change, according to the priority of the URSP rule and the priority of the routing, select the second routing in the order of priority from high to low; the dialing factor of the second routing When it is equal to the first value, select a third network slice from the plurality of network slices associated with the second routing; when the SST field of the third network slice matches the first parameter, Determining the third network slice as the network slice used to establish the PDU session.

In another optional implementation manner, the second value is a positive number; when the processing unit 1002 does not change the network where the processing unit is located or the URSP code stream used to establish the PDU session at the current moment, According to the dial factor of the network slice associated with the URSP code stream, determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, specifically for: in the network where the terminal device is located Or when the URSP code stream used to establish the PDU session at the current moment has not changed, according to the priority of the URSP rule and the priority of the routing selection, select the URSP configured with the dial factor in order of priority from high to low. A third network slice; when the dialing factor of the third network slice is greater than a first threshold, or equal to the first value, determine the third network slice as the network slice used to establish the PDU session .

In yet another optional implementation manner, when the network where the processing unit is located or the URSP code stream used to establish the PDU session at the current moment has not changed, the processing unit 1002, according to the network associated with the URSP code stream The dialing factor of the slice, which is used to determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, specifically used for: the network where the terminal device is located or the current moment used to establish the PDU session When the URSP code stream does not change, it is determined that the network slice configured with the dialing factor is the network slice used to establish the PDU session.

In yet another optional implementation manner, the processing unit 1002 may also set the value of each dialing factor to Clearing, and performing the step of determining the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field.

The embodiments of the present application and the method embodiments shown above are based on the same idea, and the technical effects brought about by them are also the same. For specific principles, please refer to the description of the above-mentioned embodiments, and details will not be repeated here.

The embodiment of the present application also provides a communication device 1100 , and FIG. 11 is a schematic structural diagram of the communication device 1100 . The communication apparatus 1100 may be a terminal device, or may be a chip, a chip system, or a processor that supports the terminal device to implement the above method. The device can be used to implement the methods described in the above method embodiments, and for details, refer to the descriptions in the above method embodiments.

The communication device 1100 may include one or more processors 1101 . The processor 1101 may be a general-purpose processor or a special-purpose processor. For example, it may be a baseband processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or a central processing unit (Central Processing Unit, CPU). The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, and process Data for Software Programs.

Optionally, the communication device 1100 may include one or more memories 1102, on which instructions 1104 may be stored, and the instructions may be executed on the processor 1101, so that the communication device 1100 executes the above method Methods described in the Examples. Optionally, data may also be stored in the memory 1102 . The processor 1101 and the memory 1102 can be set separately or integrated together.

The memory 1102 may include but not limited to hard disk (hard disk drive, HDD) or solid-state drive (solid-state drive, SSD) and other non-volatile memory, random access memory (Random Access Memory, RAM), erasable and programmable Read-only memory (Erasable Programmable ROM, EPROM), read-only memory (Read-Only Memory, ROM) or portable read-only memory (Compact Disc Read-Only Memory, CD-ROM), etc.

Optionally, the communication device 1100 may further include a transceiver 1105 . The transceiver 1105 may be called a transceiver unit, a transceiver, or a transceiver circuit, etc., and is used to realize a transceiver function. The transceiver 1105 may include a receiver and a transmitter, and the receiver may be called a receiver or a receiving circuit, etc., for realizing a receiving function; the transmitter may be called a transmitter, or a sending circuit, for realizing a sending function.

The communication device 1100 is a terminal device: the processor 1101 is used to execute S101, S102, and S103 in the network slice selection method 100, and to execute S201-S204 in the network slice selection method 200, and to execute the network slice selection method 300 S301-S303 in.

In another possible design, the processor 1101 may include a transceiver for implementing receiving and sending functions. For example, the transceiver may be a transceiver circuit, or an interface, or an interface circuit. The transceiver circuits, interfaces or interface circuits for realizing the functions of receiving and sending can be separated or integrated together. The above-mentioned transceiver circuit, interface or interface circuit can be used for code/data reading and writing, or the above-mentioned transceiver circuit, interface or interface circuit can be used for signal transmission or transfer.

In yet another possible design, optionally, the processor 1101 may store instructions 1103, and the instructions 1103 run on the processor 1101, and may cause the communication device 1100 to execute the methods described in the foregoing method embodiments. The instruction 1103 may be fixed in the processor 1101, in this case, the processor 1101 may be implemented by hardware.

In yet another possible design, the communication device 1100 may include a circuit, and the circuit may implement the function of sending or receiving or communicating in the foregoing method embodiments. The processor and the transceiver described in the embodiment of the present application can be implemented in integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit RFIC, mixed signal IC, application specific integrated circuit (application specific integrated circuit, ASIC), printed circuit board (printed circuit board, PCB), electronic equipment, etc. The processor and transceiver can also be fabricated using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), P-type Metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The communication device described in the above embodiments may be the first communication device or the second communication device, but the scope of the communication device described in the embodiment of the present application is not limited thereto, and the structure of the communication device may not be limited by FIG. 11 . A communication device may be a stand-alone device or may be part of a larger device. For example the communication device may be:

(1) Stand-alone integrated circuits ICs, or chips, or chip systems or subsystems;

(2) A set of one or more ICs, optionally, the set of ICs may also include storage components for storing data and instructions;

(3) ASIC, such as a modem (modulator);

(4) Modules that can be embedded in other devices;

(5) Receivers, terminals, smart terminals, cellular phones, wireless devices, handsets, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

(6) Others and so on.

For the case where the communication device may be a chip or a chip system, refer to the schematic structural diagram of the chip shown in FIG. 12 . The chip 1200 shown in FIG. 12 includes a processor 1201 and a communication interface 1202 . Wherein, the number of processors 1201 may be one or more, and the number of communication interfaces 1202 may be more than one. The chip 1200 may further include a memory 1203 .

In one design, for the case where the chip is used to implement the functions of the terminal device in the embodiment of the present application:

The processor 1201 is configured to acquire a routing policy (URSP) code stream sent by a network device;

The processor 1201 is further configured to determine the network slice used to establish the protocol data unit PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field , wherein the first parameter is a pre-configured parameter associated with the terminal device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is the A field for identifying the type of each network slice in the multiple network slices associated with the URSP code stream;

The processor 1201 is further configured to establish a PDU session based on the network slice used for establishing the PDU session.

In the embodiment of the present application, the communication device 1100 and the chip 1200 may also execute the implementation described in the communication device 1000 above. Those skilled in the art can also understand that various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functions are implemented by hardware or software depends on the specific application and overall system design requirements. Those skilled in the art can use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the protection scope of the embodiments of the present application.

The embodiment of the present application and the method embodiments shown in the network slice selection method 100 to the network slice selection method 300 above are based on the same idea, and the technical effects they bring are also the same. For specific principles, please refer to the above network slice selection method 100 to the network slice selection method. The description of the embodiment shown in 300 is not repeated here.

Those skilled in the art can also understand that various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functions are implemented by hardware or software depends on the specific application and overall system design requirements. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the protection scope of the embodiments of the present application.

The present application also provides a computer-readable storage medium for storing computer software instructions, and when the instructions are executed by a communication device, the functions of any one of the above method embodiments are realized.

The present application also provides a computer program product, which is used for storing computer software instructions, and when the instructions are executed by a communication device, the functions of any one of the above method embodiments are realized.

The present application also provides a computer program, which, when running on a computer, can realize the functions of any one of the above method embodiments.

In the above embodiments, all or part may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) etc.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A method for selecting a network slice, applied to a terminal device, characterized in that the method comprises:

Obtain the routing policy (URSP) code stream sent by the network device;

According to the first parameter and the slice or service type (SST) field, from the plurality of network slices associated with the URSP stream, determine the network slice used to establish the protocol data unit PDU session, wherein the first parameter is Preconfigured parameters associated with the terminal device, the first parameter is used to identify the network slice type applicable to the terminal device, and the SST field is used in the URSP code stream to identify the URSP code stream association A field for the type of each network slice in multiple network slices;

Establishing a PDU session based on the network slice used for establishing the PDU session.
The method according to claim 1, wherein the URSP code stream includes URSP rules of different priorities, and each of the URSP rules includes routing selections of different priorities;

According to the first parameter and the slice or service type (SST) field, from the plurality of network slices associated with the URSP stream, determine the network slice used to establish the PDU session, including:

According to the priority of the URSP rule and the priority of the routing selection, select a first network slice from a plurality of network slices associated with the URSP code stream in order of priority from high to low;

If the SST field of the first network slice matches the first parameter, determine the first network slice as the network slice for establishing the PDU session.
The method according to claim 1 or 2, characterized in that the method further comprises:

Configure a dialing factor for each group of routing in the multiple groups of routing associated with the URSP stream, and the initial value of the dialing factor is a first value; the first value is a real number;

In the first routing selection corresponding to the network slice used to establish the PDU session, if each second network slice fails to establish a PDU session, the dialing factor of the first routing selection is subtracted by not being A second value of zero; the second network slice is a network slice whose SST field matches the first parameter in the first routing selection.
The method according to claim 1 or 2, characterized in that the method further comprises:

Among the multiple network slices associated with the URSP, the network slice whose SST field matches the first parameter is configured with a dialing factor, and the initial value of the dialing factor is a first value; the first value is a real number;

If the establishment of the PDU session based on the network slice used to establish the PDU session fails, subtract a second value that is not zero from the dialing factor of the network slice used to establish the PDU session.
The method according to claim 1 or 2, characterized in that the method further comprises:

In the case where the PDU session is successfully established based on the network slice used to establish the PDU session, a dialing factor is configured for the network slice used to establish the PDU session, and the initial value of the dialing factor is a first value; The first numerical value is a real number.
The method according to any one of claims 3 to 5, wherein the method further comprises:

When the established PDU session is disconnected and reconnected to the network, determine whether the network where the terminal device is located changes, or whether the URSP code stream used to establish the PDU session at the current moment changes;

When the network where the terminal device is located or the URSP code stream used to establish the PDU session currently does not change, according to the dialing factor of the routing rule associated with the URSP code stream, or the dialing factor of the associated network slice, from the Determine the network slice used to establish the PDU session among the multiple network slices associated with the URSP code stream;

Establishing the PDU session based on the network slice used for establishing the PDU session.
The method according to claim 3, wherein the second value is a positive number; when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, According to the dialing factor of the routing rule associated with the URSP code stream, determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, including:

When the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, according to the priority of the URSP rule and the priority of the route selection, the priority is from high to low The order of selection of the second routing;

Selecting a third network slice from multiple network slices associated with the second route selection when the dialing factor of the second route selection is greater than a first threshold;

If the SST field of the third network slice matches the first parameter, determine the third network slice as the network slice for establishing the PDU session.
The method according to claim 3, wherein when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, according to the route associated with the URSP code stream The dialing factor of the rule determines the network slice used to establish the PDU session from the multiple network slices associated with the URSP stream, including:

When the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, according to the priority of the URSP rule and the priority of the route selection, the priority is from high to low The order of selection of the second routing;

When the dialing factor of the second routing is equal to the first value, selecting a third network slice from a plurality of network slices associated with the second routing;

If the SST field of the third network slice matches the first parameter, determine the third network slice as the network slice for establishing the PDU session.
The method according to claim 4, wherein the second value is a positive number; when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, According to the dial factor of the network slice associated with the URSP code stream, determine the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream, including:

When the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, according to the priority of the URSP rule and the priority of the route selection, the priority is from high to low selecting a third network slice configured with a dialing factor in an order of ;

When the dialing factor of the third network slice is greater than a first threshold or equal to the first value, determining the third network slice as the network slice for establishing the PDU session.
The method according to claim 5, wherein when the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment has not changed, according to the network associated with the URSP code stream The dialing factor of the slice determines the network slice used to establish the PDU session from the multiple network slices associated with the URSP stream, including:

When the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment does not change, determine the network slice configured with the dialing factor as the network slice used to establish the PDU session.
The method according to any one of claims 6 to 10, further comprising:

When the network where the terminal device is located or the URSP code stream used to establish the PDU session at the current moment changes, the values of the dialing factors are cleared, and the first parameter and slice or service type ( SST) field, from the multiple network slices associated with the URSP code stream, determine the step of establishing the network slice for the protocol data unit PDU session.
A communication device, characterized in that the communication device includes:

A processing unit, configured to acquire a routing policy (URSP) code stream sent by a network device;

The processing unit is further configured to determine a network slice for establishing a protocol data unit PDU session from among multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, Wherein, the first parameter is a pre-configured parameter associated with the terminal device, the first parameter is used to identify the type of network slice applicable to the terminal device, and the SST field is used in the URSP code stream A field for identifying the type of each network slice among the multiple network slices associated with the URSP code stream;

The processing unit is further configured to establish a PDU session based on the network slice used for establishing the PDU session.
The communication device according to claim 12, wherein the URSP code stream includes URSP rules with different priorities, and each of the URSP rules includes routing options with different priorities;

The processing unit determines the network slice used to establish the PDU session from the multiple network slices associated with the URSP code stream according to the first parameter and the slice or service type (SST) field, specifically for:

According to the priority of the URSP rule and the priority of the routing selection, select a first network slice from a plurality of network slices associated with the URSP code stream in order of priority from high to low;

If the SST field of the first network slice matches the first parameter, determine the first network slice as the network slice for establishing the PDU session.
The communication device according to claim 12 or 13, characterized in that,

The processing unit is also configured to configure a dialing factor for each group of routings associated with the URSP code stream, and the initial value of the dialing factor is a first value; the first value is a real number;

In the first routing selection corresponding to the network slice used to establish the PDU session, if each second network slice fails to establish a PDU session, the dialing factor of the first routing selection is subtracted by not being A second value of zero; the second network slice is a network slice whose SST field matches the first parameter in the first routing selection.
A communication device, characterized in that it includes a processor and a communication interface, the communication interface is used to communicate with other communication devices; the processor is used to run a program, so that the communication device implements any one of claims 1 to 11. one of the methods described.
A computer-readable storage medium, the computer-readable storage medium is used to store computer software instructions, when the above computer software instructions are run on a computer, the method described in any one of claims 1 to 11 is executed .
A computer program product comprising instructions which, when run on a computer, cause the method of any one of claims 1 to 11 to be performed.
A system on a chip, characterized in that it comprises:

communication interface for input and/or output of information;

A processor, configured to execute a computer-executable program, so that the device installed with the system-on-a-chip executes the method according to any one of claims 1-11.