WO2021022428A1

WO2021022428A1 - Wireless communication method, terminal device and network device

Info

Publication number: WO2021022428A1
Application number: PCT/CN2019/099139
Authority: WO
Inventors: 许阳; 杨宁
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2021-02-11
Also published as: CN113574936A

Abstract

A wireless communication method, a terminal device and a network device. The method comprises: a terminal device determining a preferred core network type according to first information or second information, wherein the first information is information configured by a network device and used for core network selection, and the second information is history information about the core network selection of the terminal device; and the terminal device preferentially selecting to initiate a registration procedure to a core network of the preferred core network type.

Description

Wireless communication method, terminal equipment and network equipment

Technical field

The embodiments of the present application relate to the field of communications, and in particular to a wireless communication method, terminal device, and network device.

Background technique

In the New Radio (NR) system, both standalone (SA) networking and non-standalone (NSA) networking are supported. Among them, for SA networks, the core network is the 5G core Network (5G Core, 5GC). For NSA networks, the core network is Evolved Packet Core (EPC).

When the area where the terminal device is located includes both SA and NSA networks, that is, the network device is covered by 5GC and EPC, it is an urgent problem that the terminal device chooses which core network to connect to to register to increase the probability of successful registration.

Summary of the invention

The embodiments of the present application provide a wireless communication method, terminal equipment, and network equipment, which are beneficial to improve the probability of successful core network registration.

In a first aspect, a wireless communication method is provided, including: a terminal device determines a preferred core network type according to first information or second information, where the first information is information configured by the network device for core network selection, The second information is historical information of the core network selection of the terminal device; the terminal device preferentially selects to initiate a registration process to the core network of the preferred core network type.

In a second aspect, a wireless communication method is provided, including: a network device sends first information to a terminal device, the first information is used by the terminal device to determine a preferred core network type, and the first information is the network device Information configured for core network selection.

In a third aspect, a terminal device is provided, which is configured to execute the foregoing first aspect or any possible implementation of the first aspect. Specifically, the terminal device includes a unit for executing the foregoing first aspect or any possible implementation of the first aspect.

In a fourth aspect, a network device is provided, which is configured to execute the foregoing second aspect or any possible implementation of the second aspect. Specifically, the network device includes a unit for executing the foregoing second aspect or the method in any possible implementation manner of the second aspect.

In a fifth aspect, a terminal device is provided. The terminal device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned first aspect or each of its implementation modes.

In a sixth aspect, a network device is provided. The network device includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned second aspect or each of its implementation modes.

In a seventh aspect, a chip is provided for implementing any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

Specifically, the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes any one of the above-mentioned first aspect to the second aspect or any of the implementations thereof method.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program that enables a computer to execute any one of the first aspect to the second aspect or the method in each implementation manner thereof.

In a ninth aspect, a computer program product is provided, including computer program instructions, which cause a computer to execute any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

In a tenth aspect, a computer program is provided, which when running on a computer, causes the computer to execute any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

Based on the above technical solution, the terminal device can register the core network according to the historical information of the network device configuration or core network selection, which is beneficial to reduce the probability of core network registration failure and improve user experience.

Description of the drawings

Fig. 1 is a schematic diagram of an application scenario provided by an embodiment of the present application.

Figure 2 is a schematic diagram of a connection mode of SA and NAS networking.

Fig. 3 is a schematic flowchart of core network registration performed by a terminal device.

FIG. 4 is a schematic diagram of a wireless communication method provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of another wireless communication method provided by an embodiment of the present application.

Fig. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a network device provided by an embodiment of the present application.

Fig. 8 is a schematic block diagram of a communication device according to another embodiment of the present application.

FIG. 9 is a schematic block diagram of a chip provided by an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication system according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, and Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 1. The communication system 100 may include an access network device 110, and the access network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or a terminal). The access network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area. Optionally, the access network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolution in the LTE system Type base station (Evolutional Node B, eNB or eNodeB), or a wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, or a vehicle Devices, wearable devices, hubs, switches, bridges, routers, network side devices in 5G networks, or network devices in the future evolution of public land mobile networks (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage area of the access network device 110. The "terminal equipment" used here includes but is not limited to connection via wired lines, such as via public switched telephone networks (PSTN), digital subscriber lines (Digital Subscriber Line, DSL), digital cables, and direct cable connections ; And/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM- FM broadcast transmitter; and/or another terminal device that is set to receive/send communication signals; and/or Internet of Things (IoT) equipment. A terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.

Optionally, direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.

Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Optionally, in some scenarios, the communication system 100 may further include an access network device 130, and the access network device 130 may also provide network services for the terminal device 120. For example, the access network device 120 and the access network device 130 may provide services for terminal devices through dual connection (DC). As an example, the access network device 120 may be the main access network device. The network access device 130 may be a secondary access network device. Optionally, the communication system may also include more auxiliary access network devices. The terminal device can establish a connection with the main access network device and the auxiliary access network device at the same time. The connection established between the terminal equipment and the primary access network equipment is the primary connection, and the connection established between the terminal equipment and the secondary access network equipment is the secondary connection. The control signaling of the terminal device can be transmitted through the main connection, and the data of the terminal device can be transmitted through the main connection and the auxiliary connection at the same time, or only through the auxiliary connection.

As an example, the access network device 120 may be an LTE network access network device, for example, an evolved UMTS terrestrial radio access network (Evolution-UMTS Terrestrial Radio Access Network, E-UTRAN), the access network device 130 It can be the access network equipment of the NR network. As another example, the access network device 120 may be an access network device of an NR network, and the access network device 130 may be an access network device of an LTE network. Or, both the access network device 120 and the access network device 130 are access network devices of the NR network, or both are access network devices of the LTE network, and so on.

In other embodiments, the access network equipment 120 and the access network equipment 130 may also be access network equipment in a 2G or 3G network. For example, the access network equipment 120 may be an access network equipment in a GSM network. The access network equipment of a CDMA network, etc., the access network equipment 130 may also be an access network equipment of a GSM network, or an access network equipment of a CDMA network.

In some embodiments, the communication system may further include a core network device 140. The core network device 140 may be, for example, the core network of an LTE network, that is, Evolved Packet Core (EPC), for example, a mobility management entity. (Mobility Management Entity, MME), for example, Serving Gateway (SGW), etc.

In some embodiments, the communication system may further include a core network device 150. The core network device 150 may be, for example, a 5G Core Network (5G Core Network, 5GC), for example, access and mobility management functions (Access and Mobility Management). Management Function (AMF), for example, authentication server function (Authentication Server Function, AUSF), for example, user plane function (User Plane Function, UPF), etc.

Figure 1 exemplarily shows four network devices and one terminal device. Optionally, the communication system 100 may include more network devices and the coverage of each network device may include other numbers of terminal devices. The application embodiment does not limit this.

In some scenarios, network deployment may include standalone (SA) networking and non-standalone (Non-standalone, NSA) networking. Figure 2 shows a schematic diagram of a connection mode of SA networking and NAS networking.

As for the SA networking mode, as an example, the Next Generation Radio Access Network (NG-RAN) is connected to the core network of the 5G network, namely 5GC. The NR-RAN may include E-UTRAN (ie, LTE The access network equipment of the network) and the access network equipment of the NR network, E-UTRAN and 5GC can communicate through N2/N3 messages, and NR and 5GC can communicate through N2/N3 messages. The terminal device can use the N1 Non-Access Stratum (NAS) message to initiate a registration process to the 5GC.

In the SA network, the terminal equipment that uses the 5GC network can be called N1UE. The N1UE can transmit control information or data only through E-UTRAN, or it can transmit control information or data only through the NR access network, or through E-UTRAN and NR access networks transmit control information or data.

For the NSA networking mode, as an example, E-UTRAN can be used as the primary access network device (or anchor node) to connect to the EPC, and the access network device of the NR network can be used as the auxiliary access network device to provide air interface data transmission , E-UTRAN and EPC can communicate through S1 message, and NR and E-UTRAN can communicate through X2 interface. The terminal device can use the EPC NAS message to initiate the registration process to the EPC.

In the NSA network, terminal equipment using the EPC network can be called EPC UE. The EPC UE can transmit control plane and user plane data only through E-UTRAN, or transmit user plane data through E-UTRAN and NR access networks.

Optionally, in the SA network and NSA network, the EPC and 5GC can also be connected to the home subscriber server (Home Subscriber Server, HSS) and unified data management (Unified Data Management, UDM) combined network element, that is, the combined network element The network element of the house has the functions of both HSS and UDM. The combined network element of the HSS and UDM can be used for authentication management of user identity and storage and management of user authentication data.

For different operators, there are differences in network deployment. For example, in the initial stage of 5G network deployment, different networks may support different services. For example, some services do not have the ability to support SA networks, and terminal equipment still needs to be implemented on LTE networks These services, for example, the 5G SA network may only support Enhanced Mobile Broadband (eMBB) services, while for other services, for example, Cellular Internet of Things (CIoT), vehicles to other devices ( Vehicle to Everything (V2X) and Device to Device (D2D) services still need to be executed under the EPC network.

When the area where the terminal device is located includes both SA and NSA networks, that is, the network device is covered by 5GC and EPC, the terminal device can initiate the registration process to the 5GC or the attachment process to the EPC, but the core network may be arbitrarily selected to access Will cause access failure. Fig. 3 is a schematic flowchart of a scenario in which a terminal device performs core network registration.

Step 21: The UE selects a core network for registration by itself, for example, the terminal device chooses to send a registration request to 5GC;

Correspondingly, 5GC receives the registration request and determines that the terminal device is not allowed to use 5GC.

Further in step 22, the 5GC sends a registration request rejection message to the UE. The registration request rejection message includes a specific reason value, for example, 5GC should not be used.

In step 23, the UE initiates a registration request to another core network after receiving the specific cause value. For example, the terminal device may initiate a registration request to the EPC. For the EPC network, the registration request may also be referred to as an attachment request.

In step 24, the EPC sends an attach request reply message to the UE. The attach request reply message indicates that the UE has successfully attached the EPC.

In other embodiments, the UE may also first choose to initiate a registration request to the EPC. After the registration fails, it may further initiate a registration request to the 5GC. If the registration is successful, the terminal device can use the 5GC to communicate.

The core network registration failure may cause multiple interactions, bring unnecessary signaling overhead, increase the time for the UE to access the network, and affect user experience.

In view of this, the embodiment of the present application provides a wireless communication method. The terminal device can register the core network according to the historical information of the network device configuration or core network selection, which is beneficial to reduce the probability of core network registration failure and improve users Experience.

It should be understood that the embodiments of the present application do not limit the application scenarios of the technical solutions, and can be applied to scenarios where multiple networking modes coexist. The multiple networking modes include but are not limited to the networking mode shown in FIG. 2, or may also It is applied to other scenarios where the coexistence of multiple core networks requires core network selection, for example, the scenario where the core network is selected for session connection establishment.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include an access network device with a communication function, a terminal device and a core network device, the access network device, the terminal device and the core network device may be the above-mentioned The specific equipment will not be repeated here.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

FIG. 4 is a schematic flowchart of a wireless communication method according to an embodiment of the application. The method 200 may be executed by the terminal device in the communication system shown in FIG. 1. As shown in FIG. 4, the method 200 may include at least part of the following content:

S210: The terminal device determines a preferred core network type according to the first information or the second information, the first information is information configured by the network device for core network selection, and the second information is the core network of the terminal device Selected historical information;

S220: The terminal device preferentially selects to initiate a registration process to the core network of the preferred core network type.

It should be understood that the embodiments of this application can be applied to core network selection during core network registration, or can also be applied to other scenarios that require core network selection, such as session establishment scenarios. It should be understood that session establishment in a 5G network can also be called It is the establishment of a protocol data unit (Protocol Data Unit, PDU) connection or the establishment of a PDU session.

Therefore, in the embodiment of the present application, after determining the preferred core network type, the terminal device can preferably perform subsequent NAS behaviors with the core network of the preferred core network type, for example, can report to the core network of the preferred core network type. The core network initiates the registration process, or may initiate a session establishment process to the core network of the preferred core network type. The following takes the core network registration scenario as an example for description, but the application is not limited to this.

It should be understood that in the embodiments of the present application, there may be multiple core network types, and the multiple core network types may include core networks of different networks, such as at least two of the following, the core network (ie EPC) in the LTE network, The core network in the NR network (ie 5GC), the core network in the 2G or 3G network, the core network in the SA network (ie EPC), and the core network (5GC) in the NSA network are not limited in the embodiment of the present application.

It should be noted that in the embodiments of this application, the EPC can be the core network in a single LTE network or the core network in the NSA. The EPC can be connected to only the LTE base station, or it can be a dual LTE base station and an NR base station. The connection method is connected to EPC.

Optionally, in the embodiments of the present application, preferentially selecting to initiate a registration process to the core network of the preferred core network type may refer to preferentially selecting to initiate a registration process to the core network of the preferred core network type, and initiating a registration process to the preferred core network In the case that the registration of the core network of the type fails, the registration process can be initiated to the core network of the other core network type. Or, preferentially selecting to initiate the registration process to the core network of the preferred core network type may also mean that the registration process can only be initiated to the core network of the preferred core network type.

It should be noted that in the embodiment of the present application, the terminal device may also determine the type of NAS message preferably used for core network registration according to the first information or the second information, and further, may preferably use the NAS message The type initiates the core network registration process. In the case of registration failure, other NAS message types can be used to initiate the core network registration process. The method of determining the NAS message type can refer to the specific implementation of determining the preferred core network type below.

In the following, the method for determining the preferred core network type will be described in conjunction with specific embodiments.

Embodiment 1: The terminal device can determine the preferred core network type among multiple core networks according to the first information configured by the network device.

Optionally, in some embodiments, the first information is used to indicate at least one of the following:

1. Priority ranking of core network types, in other words, the use priority ranking of core network types, that is, which core network type is preferentially used, or priority information of the core network type.

Taking core network types including 5GC and EPC as an example, the priority of the core network types can be arranged in descending order, for example, 5GC, EPC, which means that the priority of 5GC is higher than EPC, and for example, you can EPC, 5GC, it means that the priority of EPC is higher than 5GC; or it can be arranged in descending order, so I won’t repeat them here.

As an example, the priority information of the core network type may be that the priority of 5GC is the first priority, and the priority of EPC is the second priority, where the first priority may be higher than the second priority, or , The first priority can also be lower than the second priority;

2. The use priority ordering of non-access stratum NAS message types, in other words, the use priority ordering of NAS message types, that is, which NAS message type is preferentially used, or the priority information of the NAS message type.

Taking NAS message types including N1NAS message and EPC NAS message as an example, the priority of the NAS message type can be arranged in descending order. For example, it can be N1NAS message, EPC NAS message, which means that the priority of N1NAS message is high. In the EPC NAS message, for example, it may also be an EPC NAS message or a N1NAS message, indicating that the priority of the EPC NAS message is higher than that of the N1NAS message; or it may be arranged in descending order, which will not be repeated here.

As an example, the priority information of the NAS message type may be that the priority of the N1NAS message is the first priority, and the priority of the EPC NAS message is the second priority, where the first priority may be higher than the second priority Alternatively, the first priority may be lower than the second priority.

3. Priority ranking of access to SA network and NSA network, or the priority ranking of the use of different networking methods, that is, the core network of which networking method is preferred, or the priority information of the networking method .

The priority of accessing SA network and NSA network can be arranged in descending order. For example, it can be SA network or NSA network, which means that the priority of accessing SA network is higher than NSA network. For example, it can also be NSA network and SA network indicate that the priority of accessing the NSA network is higher than that of the SA network; or it can be arranged in descending order, which will not be repeated here.

As an example, the priority information of the networking mode may be that the priority of the SA network is the first priority, and the priority of the NSA network is the second priority, where the first priority may be higher than the second priority Or, the first priority can also be lower than the second priority.

4. Specific core network type, for example, 5GC or EPC;

Optionally, the specific core network type may be a core network type that allows the terminal device to register, or a core network type that is expected to be accessed by the terminal device, or a core network type that the terminal device can access, or a terminal device only The type of core network that can or must be accessed,

5. Specific NAS message type, for example, N1NAS or EPC NAS;

Optionally, the specific NAS message type may be a NAS message type allowed to be used by the terminal device, a NAS message type expected to be used by a terminal device, or a NAS message type that a terminal device can use, or a terminal device can only use or must Type of NAS message used, etc.

6. Specific networking methods, such as SA or NSA.

Optionally, the specific networking method may be a networking method that allows the terminal device to use, a networking method that is expected to be used by the terminal device, or a networking method that can be used by the terminal device, or the terminal device can only use or must The networking mode used, etc.

It should be understood that in this embodiment of the application, the NAS message type may have a corresponding relationship with the core network type. For example, the core network type corresponding to the N1NAS message is 5GC, and the core network type corresponding to EPC NAS is EPC.

Optionally, in some embodiments, the network device is based on the business conditions supported by the core network, the subscription information of the terminal device, the business information supported by the terminal device, the current network congestion, and the number of users supported by the core network. And other information to determine the first information.

Specific description is given by taking as an example the determination of the preferred core network type in the first core network type and the second core network type.

For example, if the terminal device does not subscribe to the first core network type and subscribes to a second core network type, the first information may indicate that the priority of the second core network type is higher than that of the first core network type. Type, or the priority of the NAS message of the second core network type is higher than the priority of the NAS message of the first core network type.

For another example, if the terminal device supports the first service, the first core network type supports the first service, and the second core network type does not support the first service, the first information may indicate the first service The priority of a core network type is higher than the priority of the second core network type, or the priority of the NAS message type corresponding to the first core network type is higher than the priority of the NAS message type of the second core network type.

For another example, if the number of users supported by the first core network type is large, the number of users supported by the second core network type is small, that is, the first core network type supports the access of more terminal devices, The first information may indicate that the priority of the first core network type is higher than the priority of the second core network type, or the priority of the NAS message type corresponding to the first core network type is higher than the NAS message corresponding to the second core network type The priority of the type.

As an embodiment, if the first information indicates the use priority ranking of core network types, the terminal device may determine the core network type with the highest priority as the preferred core according to the use priority ranking of the core network types. Net type.

For example, if the first information indicates that the priority of 5GC is higher than EPC, the terminal device may determine that 5GC is the target core network type.

As another embodiment, if the first information indicates the priority ordering of the NAS message types, the terminal device may order the NAS message types according to the priority order, and sort the core corresponding to the NAS message type with the highest priority. The network type is determined as the preferred core network type.

For example, if the first information indicates that the priority of the N1NAS message is higher than the EPCNAS message, the terminal device may determine that the core network type corresponding to the N1NAS message is the preferred core network type. Or if the first information indicates that the priority of the N1NAS message is higher than the EPCNAS message, the terminal device may directly use the N1NAS message to initiate a registration process to the 5GC.

As another embodiment, if the first information indicates the priority ranking of access to the SA network and the NAS network, the terminal device may determine the core network type corresponding to the networking mode with the highest priority as the preferred core network type.

For example, if the priority of accessing the SA network is higher than the priority of accessing the NSA network, the terminal device determines the core network type of the SA network as the preferred core network type; for another example, if the priority of accessing the SA network The priority is lower than the priority of accessing the NSA network, and the terminal device determines the core network type of the NSA network as the preferred core network type.

As another embodiment, if the first information indicates the core network type that allows the terminal device to register, the terminal device may determine the core network type that allows the terminal device to register as the preferred core network type.

As another embodiment, if the first information indicates the type of NAS message allowed to be used by the terminal device, the terminal device may determine the core network type corresponding to the type of NAS message allowed to be used by the terminal device as the preferred core network Types of. Or the terminal device can directly use the NAS message type to initiate the registration process.

As another embodiment, if the first information indicates the networking mode that allows the terminal device to access, the terminal device may determine the core network type corresponding to the networking mode that allows the terminal device to access as a preferred Core network type.

For example, if the terminal device is allowed to access the SA network, the terminal device may determine the core network type of the SA network as the preferred core network type; for another example, if the terminal device is allowed to access the NSA network, the terminal device The core network type of the NSA network is determined as the preferred core network type.

Hereinafter, the configuration of the first information will be described in conjunction with specific embodiments.

As an embodiment, the first information may be sent by a core network device. For example, the core network device may send the first information to a terminal device through a downlink NAS message. Specifically, the NAS of the terminal device may receive the NAS message sent by the NAS of the core network device, and the NAS message may include the first information.

Optionally, the core network device is a core network device registered by the terminal device. As an example, the core network device may be the core network device that the terminal device registered last time.

For example, the core network device may send the first information to the terminal device during the registration process of the terminal device, and the registration process may be an initial registration process, or may also be a registration caused by a location update of the terminal device. process. For example, the core network device may carry the first information through a registration request reply message or a location update request reply message.

For another example, the core network device may send a first message to the terminal device after the terminal device is successfully registered. In this case, the first message may be transmitted through any downlink NAS message.

As another embodiment, the first information may be sent by an access network device. For example, the access network device may send the first information to the terminal device through an RRC message or a broadcast message or other downlink messages or downlink channels. information. Specifically, the access stratum (Access Stratum, AS) of the terminal device may receive the first information sent by the AS of the access network device.

Optionally, the access network device is an access network device where the terminal device resides. As an example, the access network device may be the access network device where the terminal device resided last time.

For example, the access network device may send the first information to the terminal device during a radio resource control (Radio Resource Control, RRC) connection establishment process. For example, the access network device may establish through an RRC connection ( The ConnectionSetup message carries the first information. Optionally, the RRC connection setup message may also be referred to as an RRC setup (Setup) message.

For another example, the access network device may send a first message to the terminal device after the RRC connection is successfully established. In this case, the first message may be transmitted through any downlink RRC message.

Further, after the AS of the terminal device receives the first information sent by the access network device, the AS of the terminal device may also send the first information to the NAS of the terminal device. Further, The NAS of the terminal device may determine the preferred core network type according to the first information, and the specific determination method may refer to the relevant description above.

Embodiment 2: The historical information of the core network selection saved by the terminal device, that is, the second information, determines the preferred core network type among multiple core network types.

In some embodiments, the second information is used to indicate at least one of the following:

The core network type for which registration is successful or the NAS message type corresponding to the core network type;

The number of successful registrations to the core network type for which the registration is successful;

The core network type for which registration failed or the NAS message type corresponding to the core network type;

The core network type that failed to register for the first time but successfully registered again;

The number of failed registrations to the core network type for which registration failed;

The reason for the failure to register with the core network type that failed to register;

The network type corresponding to the successfully registered core network type, such as SA network or NAS network;

The networking type corresponding to the core network type that failed to register.

Optionally, in some embodiments, if the terminal device first initiates a registration process to the core network of the first core network type, if the registration fails, then initiates the registration process to the core network of the second core network type, and if the registration is successful , The core network type whose first registration fails but the re-registration succeeds may be the second core network type. For example, for the example shown in FIG. 3, if the terminal device fails to register with the 5GC, then the registration with the EPC succeeds, Then the second information may include the EPC information, or if the terminal device fails to register with the EPC first and then successfully registers with the 5GC, the second information may include the 5GC information.

It should be noted that here, the successfully registered core network types may include the successfully registered core network types in the SA network and the NAS network, that is, the successfully registered core network types in the scenario where multiple networking modes coexist, or it can be multiple types. In the case of network coexistence (different networks are independent), the core network type that is successfully registered. Similarly, the core network type that fails to register may also include the core network type that fails to register in a scenario where multiple networking modes coexist.

Specifically, after the terminal device registers with the core network, it may save the registration result to obtain the second information, which may include the type information of the registered core network and the registration result of the core network type , That is, whether the registration is successful or not, optionally, it may also include the number of successful registrations, or the number of failed registrations, and the reason for the registration failure. For example, the reason may be that the UE cannot use the core network type.

Optionally, as an embodiment, if the second information indicates that the core network type successfully registered is the first core network type, the terminal device determines the first core network type as the preferred core network type.

Optionally, as another embodiment, if the number of successful registrations with the first core network type indicated by the second information is greater than or equal to a first threshold, the terminal device determines the first core network type Is the preferred core network type.

Optionally, as yet another embodiment, the terminal device may also determine the core network type that fails the first registration but succeeds in the re-registration as the preferred core network type.

Further, in some embodiments, the terminal device may also update the second information according to the result of registration with the core network of the preferred core network type, that is, whether the registration is successful or not.

In the embodiment of this application, if the preferred core network type is EPC for Packet Core, the NAS of the terminal device may preferably use the EPC NAS message to initiate a registration request to the EPC; or

If the preferred core network type is 5GC, the NAS of the terminal device preferably uses a N1NAS message to send a registration request to the 5GC.

In some embodiments, the terminal device using the EPC NAS message to initiate a registration request to the EPC can trigger the terminal device to only establish a connection with the LTE base station. In other embodiments, the terminal device uses the EPC NAS message to The registration request initiated by the EPC may trigger the establishment of dual connections between the terminal device and the LTE base station and the NR base station.

It should be understood that the foregoing embodiment 1 and embodiment 2 can be implemented separately or combined with the embodiments. For example, when the first information indicates that the priority of EPC is higher than 5GC, but the second information indicates that the number of 5GC registration failures is higher The terminal device may determine that the preferred core network type is EPC, and may further initiate a registration process to EPC.

Therefore, according to the wireless communication method of the embodiment of the present application, the terminal device can register the core network according to the historical information of the network device configuration or core network selection, which is beneficial to reduce the probability of core network registration failure and improve user experience.

The wireless communication method according to an embodiment of the present application is described in detail above in conjunction with FIG. 4 from the perspective of a terminal device, and the wireless communication method according to another embodiment of the present application is described in detail below in conjunction with FIG. 5 from the perspective of a network device. It should be understood that the description on the network device side and the description on the terminal device side correspond to each other, and similar descriptions can be referred to above. To avoid repetition, details are not repeated here.

5 is a schematic flowchart of a wireless communication method 300 according to another embodiment of the present application. The method 300 may be executed by a network device in the communication system shown in FIG. 1. As shown in FIG. 5, the method 300 includes The following content:

S310: The network device sends first information to the terminal device, where the first information is used by the terminal device to determine a preferred core network type, and the first information is information configured by the network device for core network selection.

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

Prioritization of access to independent SA networks and non-independent NSA networks;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.

Optionally, in some embodiments, the network device is a core network device, and the network device sending the first information to the terminal device includes:

The core network device sends a NAS message to the terminal device, and the NAS message includes the first information.

Optionally, in some embodiments, the core network device is a core network device registered by the terminal device.

Optionally, in some embodiments, the NAS message is a registration request reply message or a location update request reply message.

Optionally, in some embodiments, the network device is an access network device, and the network device sending the first information to the terminal device includes:

The access network device sends the first information to the terminal device.

Optionally, in some embodiments, the access network device is an access network device where the terminal device resides.

Optionally, in some embodiments, the first information is included in a radio resource control RRC message or a broadcast message.

The method embodiments of the present application are described in detail above with reference to FIGS. 4 to 5, and the apparatus embodiments of the present application are described in detail below in conjunction with FIGS. 6 to 10. It should be understood that the apparatus embodiments and the method embodiments correspond to each other and are similar The description can refer to the method embodiment.

FIG. 6 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. As shown in FIG. 6, the terminal device 400 includes:

The processing module 410 is configured to determine a preferred core network type according to the first information or the second information, the first information is information configured by a network device for core network selection, and the second information is information of the terminal device Historical information of core network selection;

The communication module 420 is configured to preferentially select and initiate a registration process to the core network of the preferred core network type.

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.

Optionally, in some embodiments, the processing module 410 is specifically configured to:

According to the use priority ranking of the core network types, the core network type with the highest priority is determined as the preferred core network type.

According to the use priority ranking of the NAS message types, the core network type corresponding to the NAS message type with the highest priority is determined as the preferred core network type.

If the priority of accessing the SA network is higher than the priority of accessing the NSA network, determine the core network type of the SA network as the preferred core network type; or

If the priority of accessing the SA network is lower than the priority of accessing the NSA network, the core network type of the NSA network is determined as the preferred core network type.

The core network type that allows the terminal device to register is determined as the preferred core network type.

The core network type corresponding to the NAS message type allowed to be used by the terminal device is determined as the preferred core network type.

If access to the SA network is allowed, determine the core network type of the SA network as the preferred core network type; or

If access to the NSA network is allowed, the core network type of the NSA network is determined as the preferred core network type.

Optionally, in some embodiments, the communication module 420 is further configured to:

A NAS message sent by a NAS of a core network device is received at the NAS, where the NAS message includes the first information.

Optionally, in some embodiments, the communication module 420 is specifically configured to:

The first information sent by the AS of the access network device is received at the access layer AS.

Optionally, in some embodiments, the processing module 410 is further configured to:

The AS sends the first information to the NAS of the terminal device, where the first information is used by the NAS of the terminal device to determine the preferred core network type.

Optionally, in some embodiments, the second information is used to indicate at least one of the following:

The number of failed registrations to the core network type for which registration failed.

If the second information indicates that the core network type successfully registered is the first core network type, determining the first core network type as the preferred core network type; or

If the second information indicates that the number of successful registrations with the first core network type is greater than or equal to a first threshold, the first core network type is determined as the preferred core network.

The second information is updated according to whether the registration with the target core network type is successful.

Optionally, in some embodiments, the communication module 410 is further configured to:

If the target core network type is EPC Packet Core Evolution, preferably use an EPC NAS message to initiate a registration request to the EPC; or

If the target core network is a 5G core network 5GC, it is preferable to use a N1NAS message to send a registration request to the 5GC.

It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the terminal device 400 are to implement the method shown in FIG. 2 respectively. For the sake of brevity, the corresponding process of the terminal equipment in 200 will not be repeated here.

Fig. 7 is a schematic block diagram of a network device according to an embodiment of the present application. The network device 500 of FIG. 7 includes:

The communication module 510 is configured to send first information to a terminal device, where the first information is used by the terminal device to determine a preferred core network type, and the first information is information configured by the network device for core network selection.

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.

Optionally, the network device is a core network device, and the communication module 510 is specifically configured to send a NAS message from the NAS to the NAS of the terminal device, and the NAS message includes the first information.

Optionally, in some embodiments, the network device is an access network device, and the communication module 510 is specifically configured to send the first information in the AS to the AS of the terminal device.

It should be understood that the network device 500 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above and other operations and/or functions of each unit in the network device 500 are to implement the method shown in FIG. 5 respectively. For the sake of brevity, the corresponding process of the network equipment in 300 will not be repeated here.

FIG. 8 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application. The communication device 600 shown in FIG. 8 includes a processor 610, and the processor 610 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 8, the communication device 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Optionally, as shown in FIG. 8, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of antennas may be one or more.

Optionally, the communication device 600 may specifically be a network device in an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, details are not repeated here. .

Optionally, the communication device 600 may specifically be a mobile terminal/terminal device of an embodiment of the application, and the communication device 600 may implement the corresponding processes implemented by the mobile terminal/terminal device in each method of the embodiment of the application. For the sake of brevity , I won’t repeat it here.

FIG. 9 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 700 shown in FIG. 9 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 9, the chip 700 may further include a memory 720. Wherein, the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in the various methods of the embodiment of the present application. For brevity, details are not described herein again.

Optionally, the chip can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application. For brevity, here is No longer.

It should be understood that the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip, etc.

FIG. 10 is a schematic block diagram of a communication system 900 according to an embodiment of the present application. As shown in FIG. 10, the communication system 900 includes a terminal device 910 and a network device 920.

Wherein, the terminal device 910 can be used to implement the corresponding function implemented by the terminal device in the above method, and the network device 920 can be used to implement the corresponding function implemented by the network device in the above method. For brevity, it will not be repeated here. .

It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM) ) And Direct Rambus RAM (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

It should be understood that the foregoing memory is exemplary but not restrictive. For example, the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiment of the present application is intended to include but not limited to these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application , For the sake of brevity, I will not repeat it here.

The embodiments of the present application also provide a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it is not here. Repeat it again.

Optionally, the computer program product can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, For brevity, I won't repeat them here.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity , I won’t repeat it here.

Optionally, the computer program can be applied to the mobile terminal/terminal device in the embodiment of the present application. When the computer program runs on the computer, the computer executes each method in the embodiment of the present application. For the sake of brevity, the corresponding process will not be repeated here.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A wireless communication method, characterized in that it comprises:

The terminal device determines the preferred core network type according to the first information or the second information, the first information is information configured by the network device for core network selection, and the second information is selected by the core network of the terminal device history information;

The terminal device preferentially selects to initiate a registration process to the core network of the preferred core network type.
The method according to claim 1, wherein the first information is used to indicate at least one of the following:

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

Prioritization of access to independent SA networks and non-independent NSA networks;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

The terminal device determines the core network type with the highest priority as the preferred core network type according to the use priority ranking of the core network types.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

The terminal device determines the core network type corresponding to the NAS message type with the highest priority as the preferred core network type according to the priority ranking of the use of the NAS message types.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

If the priority of accessing the SA network is higher than the priority of accessing the NSA network, the terminal device determines the core network type of the SA network as the preferred core network type; or

If the priority of accessing the SA network is lower than the priority of accessing the NSA network, the terminal device determines the core network type of the NSA network as the preferred core network type.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

The terminal device determines the core network type that allows the terminal device to register as the preferred core network type.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

The terminal device determines the core network type corresponding to the NAS message type allowed to be used by the terminal device as the preferred core network type.
The method according to claim 2, wherein the terminal device determining the preferred core network type according to the first information or the second information comprises:

If the terminal device is allowed to access the SA network, the terminal device determines the core network type of the SA network as the preferred core network type; or

If the terminal device is allowed to access the NSA network, the terminal device determines the core network type of the NSA network as the preferred core network type.
The method according to any one of claims 1 to 8, wherein the method further comprises:

The terminal device receives a NAS message sent by a core network device, where the NAS message includes the first information.
The method according to claim 9, wherein the core network device is a core network device registered by the terminal device.
The method according to claim 9 or 10, wherein the NAS message is a registration request reply message or a location update request reply message.
The method according to any one of claims 1 to 8, wherein the method further comprises:

The terminal device receives the first information sent by the access network device.
The method according to claim 12, wherein the access network device is an access network device where the terminal device resides.
The method according to claim 12 or 13, wherein the first information is included in a radio resource control RRC message or a broadcast message.
The method according to any one of claims 1 to 14, wherein the second information is used to indicate at least one of the following:

The core network type for which registration is successful or the NAS message type corresponding to the core network type;

The number of successful registrations to the core network type for which the registration is successful;

The core network type for which registration failed or the NAS message type corresponding to the core network type;

The core network type that failed to register for the first time but successfully registered again;

The number of failed registrations to the core network type for which registration failed.
The method according to claim 15, wherein the terminal device determines the preferred core network type according to the first information or the second information, comprising:

If the second information indicates that the successfully registered core network type is the first core network type, the terminal device determines the first core network type as the preferred core network type; or

If the second information indicates that the number of successful registrations with the first core network type is greater than or equal to a first threshold, the terminal device determines the first core network type as the preferred core network.
The method according to any one of claims 1 to 16, wherein the method further comprises:

The second information is updated according to whether the registration with the target core network type is successful.
The method according to any one of claims 1 to 17, wherein the terminal device preferentially selects to initiate a registration process to the core network of the preferred core network type, comprising:

If the target core network type is EPC Packet Core, the terminal device preferably uses an EPC NAS message to initiate a registration request to the EPC; or

If the target core network is a 5G core network 5GC, the terminal device preferably uses a N1NAS message to send a registration request to the 5GC.
A wireless communication method, characterized in that it comprises:

The network device sends first information to the terminal device, where the first information is used by the terminal device to determine a preferred core network type, and the first information is information configured by the network device for core network selection.
The method according to claim 19, wherein the first information is used to indicate at least one of the following:

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

Prioritization of access to independent SA networks and non-independent NSA networks;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.
The method according to claim 19 or 20, wherein the network device is a core network device, and sending the first information to the terminal device by the network device comprises:

The core network device sends a NAS message to the terminal device, and the NAS message includes the first information.
The method according to claim 21, wherein the core network device is a core network device registered by the terminal device.
The method according to claim 21 or 22, wherein the NAS message is a registration request reply message or a location update request reply message.
The method according to claim 19 or 20, wherein the network device is an access network device, and sending the first information to the terminal device by the network device comprises:

The access network device sends the first information to the terminal device.
The method according to claim 24, wherein the access network device is an access network device where the terminal device resides.
The method according to claim 24 or 25, wherein the first information is included in a radio resource control RRC message or a broadcast message.
A terminal device, characterized in that it comprises:

The processing module is configured to determine the preferred core network type according to the first information or the second information, the first information is information configured by a network device for core network selection, and the second information is the core of the terminal device Historical information of network selection;

The communication module is used to preferentially select the core network of the preferred core network type to initiate a registration process.
The terminal device according to claim 27, wherein the first information is used to indicate at least one of the following:

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

Prioritization of access to independent SA networks and non-independent NSA networks;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

According to the use priority ranking of the core network types, the core network type with the highest priority is determined as the preferred core network type.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

According to the priority ranking of the NAS message types, the core network type corresponding to the NAS message type with the highest priority is determined as the preferred core network type.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

If the priority of accessing the SA network is higher than the priority of accessing the NSA network, determine the core network type of the SA network as the preferred core network type; or

If the priority of accessing the SA network is lower than the priority of accessing the NSA network, the core network type of the NSA network is determined as the preferred core network type.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

The core network type that allows the terminal device to register is determined as the preferred core network type.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

The core network type corresponding to the NAS message type allowed to be used by the terminal device is determined as the preferred core network type.
The terminal device according to claim 28, wherein the processing module is specifically configured to:

If access to the SA network is allowed, determine the core network type of the SA network as the preferred core network type; or

If access to the NSA network is allowed, the core network type of the NSA network is determined as the preferred core network type.
The terminal device according to any one of claims 27 to 34, wherein the communication module is further configured to:

A NAS message sent by a NAS of a core network device is received at the NAS, where the NAS message includes the first information.
The terminal device according to claim 35, wherein the core network device is a core network device registered by the terminal device.
The terminal device according to claim 35 or 36, wherein the NAS message is a registration request reply message or a location update request reply message.
The terminal device according to any one of claims 27 to 34, wherein the communication module is specifically configured to:

The first information sent by the AS of the access network device is received at the access layer AS.
The terminal device according to claim 38, wherein the access network device is an access network device where the terminal device resides.
The terminal device according to claim 38 or 39, wherein the first information is included in a radio resource control RRC message or a broadcast message.
The terminal device according to any one of claims 38 to 40, wherein the processing module is further configured to:

The AS sends the first information to the NAS of the terminal device, where the first information is used by the NAS of the terminal device to determine the preferred core network type.
The terminal device according to any one of claims 27 to 41, wherein the second information is used to indicate at least one of the following:

The core network type for which registration is successful or the NAS message type corresponding to the core network type;

The number of successful registrations to the core network type for which the registration is successful;

The core network type for which registration failed or the NAS message type corresponding to the core network type;

The core network type that failed to register for the first time but successfully registered again;

The number of failed registrations to the core network type for which registration failed.
The terminal device according to claim 42, wherein the processing module is specifically configured to:

If the second information indicates that the core network type successfully registered is the first core network type, determining the first core network type as the preferred core network type; or

If the second information indicates that the number of successful registrations with the first core network type is greater than or equal to a first threshold, the first core network type is determined as the preferred core network.
The terminal device according to any one of claims 27 to 43, wherein the processing module is further configured to:

The second information is updated according to whether the registration with the target core network type is successful.
The terminal device according to any one of claims 27 to 44, wherein the communication module is further configured to:

If the target core network type is EPC Packet Core Evolution, preferably use an EPC NAS message to initiate a registration request to the EPC; or

If the target core network is a 5G core network 5GC, it is preferable to use a N1NAS message to send a registration request to the 5GC.
A network device, characterized in that it comprises:

The communication module is configured to send first information to the terminal device, where the first information is used by the terminal device to determine a preferred core network type, and the first information is information configured by the network device for core network selection.
The network device according to claim 46, wherein the first information is used to indicate at least one of the following:

Prioritize the use of core network types;

Prioritization of the use of non-access stratum NAS message types;

Prioritization of access to independent SA networks and non-independent NSA networks;

The core network type that allows the terminal device to register;

NAS message type allowed to be used by the terminal device;

Allow access to SA network or NSA network.
The network device according to claim 46 or 47, wherein the network device is a core network device, and the communication module is specifically configured to:

The NAS sends a NAS message to the NAS of the terminal device, where the NAS message includes the first information.
The network device according to claim 48, wherein the core network device is a core network device registered by the terminal device.
The network device according to claim 48 or 49, wherein the NAS message is a registration request reply message or a location update request reply message.
The network device according to claim 46 or 47, wherein the network device is an access network device, and the communication module is specifically configured to:

Send the first information in the AS to the AS of the terminal device.
The network device according to claim 51, wherein the access network device is an access network device where the terminal device resides.
The network device according to claim 51 or 52, wherein the first information is included in a radio resource control RRC message or a broadcast message.
A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any one of claims 1 to 18 The method described in one item.
A network device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any of claims 19 to 26 The method described in one item.
A chip, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 18, or The method of any one of claims 19 to 26.
A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 1 to 18, or any one of claims 19 to 26 The method described in the item.
A computer program product, characterized by comprising computer program instructions that cause a computer to execute the method according to any one of claims 1 to 18, or the method according to any one of claims 19 to 26 Methods.
A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 18 or the method according to any one of claims 19 to 26.