CN117641472A

CN117641472A - Communication method and device

Info

Publication number: CN117641472A
Application number: CN202210957570.4A
Authority: CN
Inventors: 李文正; 朱强华; 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2024-03-01

Abstract

The embodiment of the application provides a communication method and device, wherein the method comprises the following steps: a mobility management network element in a first network receives first information from a terminal device, wherein the first information comprises first indication information and access state information, the first indication information indicates whether the terminal device detects an access network of a second network, and the access state information comprises whether the terminal device accesses a core network of the second network through the first network; the mobility management network element sends second indication information to the terminal equipment according to the first information, and the second indication information indicates the time when the terminal equipment sends signaling to the network element of the second network. The method can reasonably distribute the indication information of the time for sending the signaling to the second network for the terminal equipment, and ensure the reliability of the communication of the terminal equipment.

Description

Communication method and device

Technical Field

The embodiment of the application relates to the field of communication, and more particularly relates to a communication method and device.

Background

Non-public network (non-p)ublic network, NPN) is a non-public fifth generation (the 5) ^th generation, 5G) networks, which may be implemented depending on network functions of a public land mobile network (public land mobile network, PLMN), such as a public network integrated NPN (public network integrated NPN, PNI-NPN), or may be implemented independent of network functions of a PLMN, such as a stand alone NPN (SNPN).

In some NPN network coverage areas (such as stadiums, concerts, parks, etc.), service network operators of the areas may provide differentiated specific services to User Equipment (UE) with specific service subscription information according to service scenario requirements. When the UE with the subscription information of the specific service enters the coverage area of the service network, the UE can find and select to access the NPN network providing the specific service, and obtain the specific network service.

When a particular service provided by the NPN network ends (e.g., concert, sports event ends), a large number of UEs accessing the NPN network will be returned by the NPN network to its home network (public network). Returning the UE from the NPN network to its home network initiates signaling to the home network, possibly resulting in a timely response to the UE's signaling request.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which can ensure the reliability of communication of terminal equipment by indicating the time for the terminal equipment to send signaling to a home network.

In a first aspect, a communication method is provided, the method comprising: a mobility management network element in a first network receives first information from a terminal device, wherein the first information comprises first indication information and access state information, the first indication information indicates whether the terminal device detects an access network of a second network, and the access state information comprises whether the terminal device accesses a core network of the second network through the first network; the mobility management network element sends second indication information to the terminal equipment according to the first information, and the second indication information indicates the time when the terminal equipment sends signaling to the network element of the second network.

In this scenario, the first network may be a network where the terminal device is currently residing, and the second network may be a home network of the terminal device.

Based on the above scheme, the mobility management network element can reasonably distribute the indication information of the time for sending the signaling to the second network for the terminal device according to whether the terminal device detects the second network and whether the terminal device accesses the second network through the first network, so as to ensure the reliability of the communication of the terminal device.

With reference to the first aspect, in some implementations of the first aspect, the mobility management network element sends third indication information to the terminal device, where the third indication information indicates service information of a first service, and the first service includes a service that is about to end in the first network.

Based on the above scheme, the mobile management network element sends the service information of the service to be ended in the first network to the terminal device, so that the terminal device can determine whether the service of the first network accessed by the terminal device is all ended or all to be ended based on the service information.

With reference to the first aspect, in certain implementations of the first aspect, the service information includes at least one of: service identification, service type identification, service provider identification, data network DNN information, network slicing and traffic type.

With reference to the first aspect, in some implementations of the first aspect, the mobility management network element determines duration indication information according to the first information, where the duration indication information is used to instruct the terminal device to send signaling to the network element of the second network after the duration; the mobility management network element sends the second indication information to the terminal device, wherein the second indication information comprises the duration indication information.

Based on the above scheme, the mobility management network element can allocate duration indication information to the terminal device according to whether the terminal device detects the second network and whether the terminal device accesses the second network through the first network, so that the terminal device can send signaling to the network element of the second network after the duration indicated by the duration indication information, and the reliability of communication of the terminal device is ensured.

With reference to the first aspect, in some implementations of the first aspect, the mobility management network element determines, according to the first information, that the terminal device accesses a core network of the second network through the first network, and the terminal device detects an access network of the second network, where the duration indication information is first duration indication information; or the mobility management network element determines that the terminal equipment does not access the core network of the second network through the first network according to the first information, and the terminal equipment detects the access network of the second network, wherein the duration indication information is second duration indication information; or the mobility management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first information, the terminal equipment does not detect the access network of the second network, and the duration indication information is third duration indication information; or the mobility management network element determines that the terminal equipment does not access the core network of the second network through the first network according to the first information, the terminal equipment does not detect the access network of the second network, and the duration indication information is fourth duration indication information; wherein the first time period is less than the second time period, the second time period is less than the third time period, and the third time period is less than the fourth time period.

Based on the above scheme, the mobility management network element can allocate different duration indication information to the terminal devices in different access states according to whether the terminal device detects the second network and whether the terminal device accesses the second network through the first network, so that the terminal devices with different priorities can send signaling to the network element of the second network at different occasions, and the reliability of the communication of the terminal devices is ensured.

With reference to the first aspect, in certain implementation manners of the first aspect, the first information further includes an identification of the second network on condition that the terminal device satisfies a core network accessing the second network through the first network and detects at least one of the access networks of the second network.

With reference to the first aspect, in some implementations of the first aspect, the mobility management network element obtains a set of duration indication information corresponding to the second network according to the identifier of the second network, where the duration indication information is used to instruct the terminal device to send signaling to the network element of the second network after the duration; the mobility management network element determines one duration indication information in the set of duration indication information according to the first indication information and the access state information; the mobility management network element sends the second indication information to the terminal device, wherein the second indication information comprises the duration indication information.

Based on the above scheme, the mobility management network element can determine a set of duration indication information corresponding to the second network according to the identifier of the second network, and allocate one duration indication information in the set of duration indication information to the terminal device, so that the terminal device can send signaling to the network element of the second network at a proper time.

With reference to the first aspect, in some implementations of the first aspect, the set of duration indication information corresponding to the second network includes first duration indication information, second duration indication information, third duration indication information and fourth duration indication information, where the first duration is less than the second duration, the second duration is less than the third duration, the third duration is less than the fourth duration, the mobility management network element determines, according to the first indication information and the access status information, that the terminal device accesses a core network of the second network through the first network, and the terminal device detects an access network of the second network, and the one duration indication information is the first duration indication information; or the mobility management network element determines that the terminal equipment does not access the core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment detects the access network of the second network, wherein the one duration indication information is the second duration indication information; or the mobility management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first indication information and the access state information, the terminal equipment does not detect an access network of the second network, and the duration indication information is the third duration indication information; or the mobility management network element determines that the terminal equipment does not access the core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment does not detect the access network of the second network, wherein the duration indication information is the fourth duration indication information.

With reference to the first aspect, in certain implementations of the first aspect, the first network is a non-public network that is deployed independently.

With reference to the first aspect, in certain implementations of the first aspect, the second network is a public land mobile network or a non-public network deployed independently.

In a second aspect, a communication method is provided, the method comprising: the method comprises the steps that a terminal device sends first information to a mobile management network element in a first network, wherein the first information comprises first indication information and access state information, the first indication information indicates whether the terminal device detects an access network of a second network, and the access state information comprises whether the terminal device accesses a core network of the second network through the first network; the terminal device receives second indication information from the mobility management network element, the second indication information being sent according to the first information, the second indication information indicating a timing at which the terminal device sends signaling to the network element of the second network.

Based on the above scheme, the terminal device can report to the mobility management network element whether the second network is detected or not and whether the terminal device accesses the information of the second network through the first network, so that the mobility management network element can determine the time when the terminal device sends signaling to the second network based on the information, and the reliability of the communication of the terminal device is ensured.

With reference to the second aspect, in some implementations of the second aspect, the terminal device determines whether an access network of the second network is detected according to a signal quality of a current area; the terminal equipment determines whether to access the core network of the second network through the first network according to the access state of the terminal equipment.

With reference to the second aspect, in some implementations of the second aspect, if the terminal device determines that the access network of the second network is detected according to the signal quality of the current area, and/or the terminal device determines that the core network of the second network is accessed through the first network according to the access state of the terminal device, the first information further includes an identifier of the second network.

With reference to the second aspect, in some implementations of the second aspect, the terminal device receives third indication information from the mobility management element, where the third indication information indicates service information of a first service, and the first service includes a service that is about to end in the first network; and the terminal equipment determines that the second service is completely ended according to the third indication information, wherein the second service comprises the service in the first network which is accessed by the terminal equipment currently.

Based on the above scheme, the terminal device can determine that all the services in the first network accessed by the terminal device are ended based on the third indication information sent by the mobility management network element, and under the condition that all the services accessed by the terminal device are ended, the terminal device can report the first information to the mobility management network element, so that the services accessed by the terminal device at present can be ensured not to be affected.

With reference to the second aspect, in certain implementations of the second aspect, the service information includes at least one of: service identification, service type identification, service provider identification, data network DNN information, network slicing and traffic type.

With reference to the second aspect, in some implementations of the second aspect, if the terminal device determines that the service information of the first service includes the service information of the second service according to the third indication information, the terminal device determines that the second service is all ended.

With reference to the second aspect, in some implementations of the second aspect, the second indication information includes duration indication information, where the duration indication information is used to instruct the terminal device to send signaling to a network element of the second network after the duration.

Based on the scheme, the terminal equipment can send the signaling to the network element of the second network after the duration indicated by the duration indication information, so that the signaling overload of the second network caused by the sent signaling is avoided.

With reference to the second aspect, in some implementations of the second aspect, the first information includes a core network of the terminal device accessing the second network through the first network, and the terminal device detects an access network of the second network, where the duration indication information is first duration indication information; and/or the first information comprises a core network of the second network which is not accessed by the terminal equipment through the first network, the terminal equipment detects the access network of the second network, and the duration indication information is second duration indication information; and/or the first information comprises a core network of the second network accessed by the terminal equipment through the first network, the access network of the second network is not detected by the terminal equipment, and the duration indication information is third duration indication information; and/or the first information comprises a core network of the second network which is not accessed by the terminal equipment through the first network, the access network of the second network is not detected by the terminal equipment, and the duration indication information is fourth duration indication information; wherein the first time period is less than the second time period, the second time period is less than the third time period, and the third time period is less than the fourth time period.

Based on the scheme, according to whether the second network is detected and whether the second network is accessed through the first network, the terminal equipment with different priorities can receive different duration indication information, so that the terminal equipment with different priorities can send signaling to the network element of the second network at different occasions, and the reliability of the communication of the terminal equipment is ensured.

With reference to the second aspect, in certain implementations of the second aspect, the first network is a non-public network that is deployed independently.

With reference to the second aspect, in certain implementations of the second aspect, the second network is a public land mobile network or a non-public network deployed independently.

In a third aspect, a communication apparatus is provided, the apparatus comprising a transceiver unit configured to receive first information from a terminal device, the first information including first indication information indicating whether the terminal device detects an access network of a second network and access state information including whether the terminal device accesses a core network of the second network through the first network; the transceiver unit is further configured to send second indication information to the terminal device, where the second indication information indicates a timing at which the terminal device sends signaling to a network element of the second network.

With reference to the third aspect, in some implementations of the first aspect, the transceiver unit is further configured to send third indication information to the terminal device, where the third indication information indicates service information of a first service, and the first service includes a service that is about to end in the first network.

With reference to the third aspect, in certain implementations of the third aspect, the service information includes at least one of: service identification, service type identification, service provider identification, data network DNN information, network slicing and traffic type.

With reference to the third aspect, in some implementations of the third aspect, the communication apparatus further includes a processing unit, where the processing unit is configured to determine duration indication information according to the first information, where the duration indication information is configured to instruct the terminal device to send signaling to a network element of the second network after the duration; the transceiver unit is specifically configured to send the second indication information to the terminal device, where the second indication information includes the duration indication information.

With reference to the third aspect, in some implementations of the third aspect, the processing unit is specifically configured to determine, according to the first information, that the terminal device accesses a core network of the second network through the first network, and the terminal device detects an access network of the second network, where the duration indication information is first duration indication information; or the processing unit is specifically configured to determine, according to the first information, that the terminal device does not access the core network of the second network through the first network, and that the terminal device detects the access network of the second network, where the duration indication information is second duration indication information; or the processing unit is specifically configured to determine, according to the first information, that the terminal device accesses the core network of the second network through the first network, and the terminal device does not detect the access network of the second network, where the duration indication information is third duration indication information; or the processing unit is specifically configured to determine, according to the first information, that the terminal device does not access the core network of the second network through the first network, and that the terminal device does not detect the access network of the second network, where the duration indication information is fourth duration indication information.

Wherein the first time period is less than the second time period, the second time period is less than the third time period, and the third time period is less than the fourth time period.

With reference to the third aspect, in some implementations of the third aspect, the first information further includes an identification of the second network on condition that the terminal device satisfies a core network accessing the second network through the first network, and detects at least one of the access networks of the second network.

With reference to the third aspect, in some implementations of the third aspect, the processing unit is specifically configured to obtain, according to an identifier of the second network, a set of duration indication information corresponding to the second network, where the duration indication information is used to instruct the terminal device to send signaling to a network element of the second network after the duration; determining one duration indication information in the set of duration indication information according to the first indication information and the access state information; the transceiver unit is specifically configured to send the second indication information to the terminal device, where the second indication information includes the one duration indication information.

With reference to the third aspect, in some implementations of the third aspect, the set of duration indication information corresponding to the second network includes first duration indication information, second duration indication information, third duration indication information and fourth duration indication information, where the first duration is less than the second duration, the second duration is less than the third duration, the third duration is less than the fourth duration, the processing unit determines, according to the first indication information and the access status information, that the terminal device accesses a core network of the second network through the first network, and the terminal device detects an access network of the second network, and the one duration indication information is the first duration indication information; or the processing unit determines that the terminal equipment does not access the core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment detects the access network of the second network, wherein the one duration indication information is the second duration indication information; or the processing unit determines that the terminal equipment accesses the core network of the second network through the first network according to the first indication information and the access state information, the terminal equipment does not detect the access network of the second network, and the duration indication information is the third duration indication information; or the processing unit determines that the terminal equipment does not access the core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment does not detect the access network of the second network, wherein the duration indication information is the fourth duration indication information.

With reference to the third aspect, in some implementations of the third aspect, the first network is a non-public network that is deployed independently.

With reference to the third aspect, in some implementations of the third aspect, the second network is a public land mobile network or a non-public network deployed independently.

In a fourth aspect, a communication device is provided, the device comprising a transceiver unit configured to send first information to a mobility management element in a first network, the first information including first indication information indicating whether the communication device detects an access network of a second network and access state information including whether the communication device accesses a core network of the second network through the first network; the transceiver unit is further configured to receive second indication information from the mobility management element, where the second indication information is sent according to the first information, and the second indication information indicates a timing at which the terminal device sends signaling to the element of the second network.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the communication device further includes a processing unit, where the processing unit is configured to determine whether an access network of the second network is detected according to a signal quality of a current area; the processing unit is further configured to determine whether to access the core network of the second network through the first network according to the access state of the processing unit.

With reference to the fourth aspect, in some implementations of the fourth aspect, if the processing unit determines that the access network of the second network is detected according to the signal quality of the current area, and/or the processing unit determines, according to its access state, a core network that accesses the second network through the first network, the first information further includes an identifier of the second network.

With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver unit is specifically configured to receive third indication information from the mobility management element, where the third indication information indicates service information of a first service, and the first service includes a service that is about to end in the first network; the processing unit is further configured to determine that all second services are finished according to the third indication information, where the second services include services in the first network that the terminal device is currently accessed to.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the service information includes at least one of: service identification, service type identification, service provider identification, data network DNN information, network slicing and traffic type.

With reference to the fourth aspect, in some implementations of the fourth aspect, the processing unit is specifically configured to determine whether the service information of the first service includes the service information of the second service, and if the service information of the first service includes the service information of the second service, the processing unit determines that the second service is all ended.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second indication information includes duration indication information, where the duration indication information is used to instruct the communication device to send signaling to a network element of the second network after the duration.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first information includes a core network of the terminal device accessing the second network through the first network, and the terminal device detects an access network of the second network, where the duration indication information is first duration indication information; or,

the first information comprises a core network of the second network which is not accessed by the communication device through the first network, the communication device detects an access network of the second network, and the duration indication information is second duration indication information; or the first information comprises a core network of the second network accessed by the communication device through the first network, the communication device does not detect the access network of the second network, and the duration indication information is third duration indication information; or the first information includes that the communication device does not access the core network of the second network through the first network, and the communication device does not detect the access network of the second network, and the duration indication information is fourth duration indication information; wherein the first time period is less than the second time period, the second time period is less than the third time period, and the third time period is less than the fourth time period.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first network is a non-public network deployed independently.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second network is a public land mobile network or a non-public network deployed independently.

In a fifth aspect, there is provided a communications device having functionality to implement the method of any one of the first and second aspects, or any one of the possible implementations of these aspects. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a sixth aspect, a communication device is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program and the processor is for invoking and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in any one of the first and second aspects, or in any one of the possible implementations of these aspects.

In a seventh aspect, there is provided a communication device comprising a processor and a communication interface for receiving and transmitting data and/or information received to the processor, the processor processing the data and/or information, and the communication interface further being for outputting the data and/or information after processing by the processor, such that the method as in any one of the first and second aspects, or in any one of the possible implementations of these aspects, is performed.

In an eighth aspect, there is provided a computer readable storage medium having stored therein computer instructions which, when run on a computer, cause the method as in any one of the first and second aspects, or in any one of the possible implementations of these aspects, to be performed.

A ninth aspect provides a computer program product comprising computer program code which, when run on a computer, causes the method as in any one of the first and second aspects, or any one of the possible implementations of these aspects, to be performed.

In a tenth aspect, there is provided a communication system comprising communication means for performing the method as in the first aspect, and communication means for performing the method as in the second aspect.

An eleventh aspect provides a communication system comprising a mobility management network element for performing the method as in the first aspect and a terminal device for performing the method as in the second aspect.

Drawings

Fig. 1 shows a 5G mobile communication system architecture diagram suitable for use in embodiments of the present application.

Fig. 2 shows a schematic diagram of a system architecture to which the present application is applicable.

Fig. 3 shows a schematic diagram of a non-public network as applied to an embodiment of the present application.

Fig. 4 shows a schematic diagram of a system architecture to which the present application is applicable.

Fig. 5 shows a schematic diagram of another system architecture to which the present application is applicable.

Fig. 6 is a schematic flow chart diagram of a communication method 600 provided by an embodiment of the present application.

Fig. 7 is a schematic view of a scenario in which the present application is applicable.

Fig. 8 is a schematic flow chart diagram of a communication method 800 provided in an embodiment of the present application.

Fig. 9 is a schematic block diagram of a communication apparatus 900 provided in an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application.

Fig. 11 is a schematic block diagram of a chip system 1100 provided by an embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: a long term evolution (long term evolution, LTE) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD), a universal mobile telecommunications system (universal mobile telecommunication system, UMTS), a fifth generation (5th generation,5G) system, or a New Radio (NR) or other evolving communication system, etc.

The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system and the like, and the application is not limited to the above.

The technical solutions provided herein may also be applied to machine-type communication (machine type communication, MTC), inter-machine communication long term evolution technology (long term evolution-machine, LTE-M), device-to-device (D2D) networks, machine-to-machine (machine to machine, M2M) networks, internet of things (internet of things, ioT) networks, or other networks. The IoT network may include, for example, an internet of vehicles. The communication modes in the internet of vehicles system are generally called as vehicle to other devices (V2X, X may represent anything), for example, the V2X may include: vehicle-to-vehicle (vehicle to vehicle, V2V) communication, vehicle-to-infrastructure (vehicle to infrastructure, V2I) communication, vehicle-to-pedestrian communication (vehicle to pedestrian, V2P) or vehicle-to-network (vehicle to network, V2N) communication, etc.

Fig. 1 is a system architecture diagram to which embodiments of the present application are applicable. As shown in fig. 1, the system architecture is composed of a terminal device, a radio access network device (radio access network, RAN), a Core Network (CN), and a Data Network (DN). The terminal equipment, RAN and CN are the main components forming the architecture, and can be logically divided into a user plane and a control plane, wherein the control plane is responsible for the management of a mobile network, and the user plane is responsible for the transmission of service data. In the figure, the NG2 reference point is located between the RAN control plane and the CN control plane, the NG3 reference point is located between the RAN user plane and the CN user plane, and the NG6 reference point is located between the CN user plane and the data network.

Terminal equipment: the method is an entrance for interaction between the mobile user and the network, can provide basic computing capacity and storage capacity, displays a service window for the user, and receives the user operation input terminal equipment to establish signal connection and data connection with the RAN by adopting a new air interface technology, thereby transmitting control signals and service data to the mobile network.

RAN: similar to the base station in the traditional network, the network access function is provided for authorized users in a specific area by being deployed at a position close to the terminal equipment, and the user data can be transmitted by using transmission tunnels with different qualities according to the level of the users, the service requirements and the like. The RAN can manage own resources, reasonably utilize, provide access service for the terminal equipment according to the requirement, and forward control signals and user data between the terminal equipment and the core network.

CN: and the system is responsible for maintaining subscription data of the mobile network, managing network elements of the mobile network, and providing session management, mobility management, policy management, security authentication and other functions for the terminal equipment. Providing network access authentication for the terminal equipment when the terminal equipment is attached; when the terminal equipment has a service request, network resources are allocated to the terminal equipment; updating network resources for the terminal equipment when the terminal equipment moves; providing a quick recovery mechanism for the terminal equipment when the terminal equipment is idle; releasing network resources for the terminal equipment when the terminal equipment is detached; when the terminal equipment has service data, providing a data routing function for the terminal equipment, such as forwarding uplink data to DN; or receiving the downlink data of the terminal equipment from the DN, forwarding the downlink data to the RAN, and sending the downlink data to the terminal equipment.

DN: is a data network for providing business services for users, and generally, a client is located in a terminal device, and a server is located in the data network. The data network may be a private network, such as a local area network, or an external network not under the control of an operator, such as the Internet, or a proprietary network co-deployed by an operator, such as for configuration of IP multimedia network subsystem (IP multimedia core network subsystem, IMS) services.

Fig. 2 is a detailed architecture determined based on fig. 1, in which a core network control plane adopts a service architecture, and interactions between control plane network elements adopt a service call manner. Under the architecture, the control plane network element can open services to other control plane network elements for other control plane network elements to call. The following describes each part involved in the network architecture shown in fig. 2:

1. user Equipment (UE): may include various handheld devices, vehicle mount devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of terminals, mobile Stations (MSs), terminals, or soft terminals, etc. Such as water meters, electricity meters, sensors, etc.

By way of example, a user equipment in embodiments of the present application may refer to an access terminal, subscriber unit, subscriber station, mobile station, relay station, remote terminal, mobile device, user terminal (user terminal), terminal (terminal equipment), wireless communication device, user agent, or user equipment. The user equipment may also be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, user equipment in a 5G network or user equipment in a future evolved public land mobile network (public land mobile network, PLMN), or user equipment in a future internet of vehicles, etc., as the embodiments of the application are not limited in this regard.

As an example and not by way of limitation, in the embodiments of the present application, the wearable device may also be referred to as a wearable smart device, which is a generic term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, apparel, shoes, and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the user equipment can be user equipment in an internet of things (internet of Things, ioT) system, and the IoT is an important component of future information technology development, and the main technical characteristic of the IoT is that the article is connected with a network through a communication technology, so that man-machine interconnection and an intelligent network for internet of things are realized. In the embodiment of the application, the IOT technology can achieve mass connection, deep coverage and terminal power saving through a Narrowband (NB) technology, for example. In addition, in the embodiment of the application, the user equipment may further include sensors such as an intelligent printer, a train detector, and a gas station, and the main functions include collecting data (part of the user equipment), receiving control information and downlink data of the access network equipment, and transmitting electromagnetic waves to the access network equipment to transmit uplink data.

2. (radio) access network device (radio access network, (R) AN): the system is used for providing network access functions for authorized user equipment in a specific area and can use transmission tunnels with different qualities according to the level of the user equipment, the service requirements and the like.

The (R) AN can manage radio resources, provide access services for the ue, and further complete forwarding of control signals and ue data between the ue and the core network.

The access network device in the embodiments of the present application may be any communication device with a wireless transceiver function for communicating with a user device. The access network device includes, but is not limited to: an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home evolved Node B, heNB, or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, such as NR, a gNB in a system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or may also be a network Node constituting a gNB or a transmission point, such as a distributed unit (BBU), or a distributed unit (BBU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the access network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into access network devices in an access network (radio access network, RAN), or may be divided into access network devices in a Core Network (CN), which is not limited in this application.

3. User plane network element: quality of service (quality of service, qoS) handling for packet routing and forwarding, user plane data, etc.

In a 5G communication system, the user plane network element may be a user plane function (user plane function, UPF) network element. In future communication systems, the user plane network element may still be a UPF network element, or may have other names, which is not limited in this application.

4. Data network element: for providing a network for transmitting data.

In the 5G communication system, the data network element may be a Data Network (DN) element. In future communication systems, the data network element may still be a DN network element, or may have other names, which are not limited in this application.

5. Session management network element: the method is mainly used for session management, network interconnection protocol (internet protocol, IP) address allocation and management of terminals, selecting a termination point of manageable user plane functions, policy control and charging function interfaces, downlink data notification and the like.

In a 5G communication system, the session management function network element may be a session management function (session management function, SMF) network element. In future communication systems, the session management function element may still be an SMF element, or may have other names, which is not limited in this application.

6. Access management network element: the method is mainly used for mobility management, access management and the like, and can be used for realizing other functions besides session management in the functions of a mobility management entity (mobility management entity, MME), such as legal interception, access authorization/authentication and the like.

In a 5G communication system, the access management network element may be an access and mobility management function (access and mobility management function, AMF) network element. In future communication systems, the access management network element may still be an AMF network element, or may have other names, which is not limited in this application.

7. The authentication server: the method is used for realizing the bidirectional authentication of the terminal by the authentication service and the generation of the secret key, and supports a unified authentication framework.

In a 5G communication system, the authentication server may be an authentication server function (authentication server function, AUSF) network element. In future communication systems, the authentication server function network element may still be an AUSF network element, or may have other names, which is not limited in this application.

8. Network slice selection network element: for looking up policy control function (policy control function, PCF) network elements associated with the session.

In a 5G communication system, the network slice selection network element may be a network slice selection function (network slice selection function, NSSF) network element. In future communication systems, the network slice selection network element may still be an NSSF network element, or may have other names, which are not limited in this application.

9. Network opening network element: the network functions are opened to third parties in the manner of a northbound API interface.

In a 5G communication system, the network opening network element may be a network opening function (network exposure function, NEF) network element. In future communication systems, the network element may be a NEF network element, or may have other names, which is not limited in this application.

10. Network storage network element: for maintaining real-time information for all network function services in the network.

In a 5G communication system, the network storage element may be a network registration function (network repository function, NRF) element. In future communication systems, the network storage network element may still be an NRF network element, or may have other names, which is not limited in this application.

It will be appreciated that the network elements or functions described above may be either network elements in a hardware device, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform).

Of course, the network architecture of fig. 1 may further include other network elements, such as a unified data repository (unified data repository, UDR) or network storage function (network repository function, NRF), and the like, which are not limited in particular.

11. Policy control network element: a unified policy framework for guiding network behavior, providing policy rule information for control plane function network elements (e.g., AMFs, SMFs, etc.), and the like.

In a 4G communication system, the policy control network element may be a policy and charging rules function (policy and charging rules function, PCRF) network element. In a 5G communication system, the policy control network element may be a policy control function (policy control function, PCF) network element. In future communication systems, the policy control network element may still be a PCF network element, or may have other names, which are not limited in this application.

12. Data management network element: the method is used for processing terminal identification, access authentication, registration, mobility management and the like.

In a 5G communication system, the data management network element may be a unified data management (unified data management, UDM) network element. In future communication systems, the unified data management may still be a UDM network element, or may have other names, which are not limited in this application.

13. Application network element: the method is used for carrying out data routing of application influence, accessing network elements with open functions of the network, interacting with a policy framework to carry out policy control and the like.

In a 5G communication system, the application network element may be an application function (application function, AF) network element. In future communication systems, the application network element may still be an AF network element, or may have other names, which are not limited in this application.

It will be appreciated that the network elements or functions described above may be either network elements in a hardware device, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). As a possible implementation method, the network element or the function may be implemented by one device, or may be implemented by a plurality of devices together, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.

In the architecture shown in fig. 2, devices may communicate through an interface shown in the figure. As shown in fig. 1, a Next generation Network (NG) 1 interface (abbreviated as N1 interface) is a reference point between a terminal device and a mobility management network element; the N2 interface is a reference point of the (R) AN and the mobility management network element, and is used for sending non-access stratum (NAS) messages; the N3 interface is a reference point between (R) AN and UPF, and is used for transmitting data of user plane, etc.; the N4 interface is a reference point between the SMF and the UPF, and is used for transmitting information such as tunnel identification information, data buffer indication information, downlink data notification message, and the like of the N3 connection; the N6 interface is a reference point between the UPF and the DN, and is used for transmitting data of the user plane, etc.

The architecture to which the embodiment of the present application shown in fig. 2 can be applied is merely an example, and the architecture to which the embodiment of the present application is applied is not limited to this, and any architecture capable of implementing the functions of the respective devices described above is applicable to the embodiment of the present application.

It should also be understood that the above designations are merely defined to facilitate distinguishing between different functions and should not be construed as limiting the present application in any way. The present application does not exclude the possibility of employing other naming in 5G networks as well as other networks in the future. For example, in a 6G network, some or all of the above devices may follow the terminology in 5G, other names may also be used, etc. The names of interfaces between the devices in fig. 1 are only an example, and the names of interfaces in the specific implementation may be other names, which are not specifically limited in this application. Furthermore, the names of the transmitted messages (or signaling) between the above-described respective devices are also merely an example, and do not constitute any limitation on the functions of the messages themselves.

Fig. 3 shows a schematic diagram of a non-public network as applied to an embodiment of the present application. The Non-public network (NPN) shown in fig. 3 is a Non-public 5G network, and can be divided into a public network integrated NPN (public network integrated NPN) and an independent deployment NPN (SNPN) according to whether it relies on the network functions of the public land mobile network (Public Land Mobile Network, PLMN). PNI-NPN and SNPN are described in sequence below.

Fig. 3 (a) shows a PNI-NPN, which can be implemented using network slices in a PLMN. To prevent unauthorized UEs from accessing and selecting PNI-NPN, closed access group (closed access group, CAG) functionality may be additionally used. The CAG identifies a set of users that are allowed to access a cell associated with the CAG (CAG cell). To prevent terminal devices that are not allowed to access the CAG cell from automatically selecting and accessing the CAG cell, the CAG cell broadcasts one or more CAG IDs. Secondly, an available CAG list (list) and an indication (indicating whether the terminal device is only allowed to access 5GS through the CAG cell) are configured on the terminal device, and the UE subscription data on the UDM includes the available CAG list and the indication. That is, access to the terminal device is restricted by broadcasting the CAG ID and configuring the CAG ID available to the terminal device.

When the terminal equipment is switched within 5GS, if the Target cell is a CAG cell and the CAG ID supported by the CAG cell is not the CAG ID in the CAG list available to the UE, the Source (Source) RAN (S-RAN) should not switch the UE to the Target (Target) RAN (T-RAN) or the T-RAN should reject the N2-based switching process; if the target cell is a non-CAG cell and the UE is only allowed to access 5GS through the CAG cell, the S-RAN should not handover the UE to the non-CAG cell or the T-RAN of the non-CAG cell should reject the N2 based handover procedure.

Fig. 3 (b) shows an SNPN, which does not depend on the PLMN network. The SNPN is identified using a PLMN ID+network identifier (network identifier, NID). The PLMN ID may be an intrinsic value reserved for the third party operator, or may be a specific value of the PLMN operator deploying the SNPN. In the SNPN, a cell broadcasts PLMN ID+NID, and terminal equipment selects an accessed NPN according to broadcast information and configured network selection information. If the terminal device finds that the configured network selection information (PLMN id+nid1) is different from the PLMN ID or PLMN id+nid2 broadcasted by the network, the terminal device will not select its access, i.e. let the terminal device correctly select the cell and network by broadcasting PLMN ID and NID.

Fig. 4 is a schematic diagram of a system architecture to which the present application is applicable.

Fig. 4 shows a roaming scenario of local breakout, i.e. network access service of a terminal device through a visited place (visited domain). Wherein the VPLMN is a network of the visited domain and the HPLMN is a network of the home domain. A secure edge protection proxy (security edge protection proxy, SEPP) acts as a border gateway between the control planes of the operators' core networks for user roaming, communication interworking between operators, and is responsible for message filtering and policy management on the control plane interfaces between operators. VSEPP is the SEPP of the visited domain, and HSEPP is the SEPP of the home domain. The network element on the left side of the dotted line is the control plane core network element of the visited domain, and the network element on the right side of the dotted line is the control plane core network element of the home domain. When the terminal device needs to perform authentication through the third party server, an authentication and authorization function (NSSAAF) network element selected by the network slice is responsible for communicating authentication messages with the third party server, and functions of other core network elements are described in fig. 1, and are not described herein.

Fig. 5 is a schematic diagram of another system architecture to which the present application is applicable.

Fig. 5 shows a roaming scenario of home routing, i.e. a terminal device accesses a service through a network of a home location (home domain), where VPLMN is a network of a visited domain, HPLMN is a network of a home domain, VSEPP is SEPP of the visited domain, and HSEPP is SEPP of the home domain. The network element on the left side of the dotted line is the control plane core network element of the visited domain, and the network element on the right side of the dotted line is the control plane core network element of the home domain. The function of the specific core network element is described with reference to fig. 1, and will not be described in detail herein.

It should be appreciated that the method provided by the embodiments of the present application may be applied to any of the above scenarios.

In some non-public network NPN coverage areas (e.g., stadiums, concerts, parks, etc.), NPN network operators of the areas will provide differentiated specific services to users with specific subscription information according to corresponding service scenario requirements. When such a user with specific subscription information enters the NPN network coverage area, it is possible to discover and select to access the NPN network providing the specific service and obtain a specific network service.

A user accessing the NPN network generally has subscription information of a home network (e.g., china mobile, china telecom, etc.) at the same time, and the user generally has a need to access public services (e.g., voice services and short message services) provided by the home network (e.g., the user needs to normally perform voice services while watching live video provided by the NPN network) while accessing specific network services provided by the NPN network, where the home network is generally a public network, or the home network may be a non-public network.

When a particular service provided by the NPN network ends (e.g., concert, sports event ends), a large number of UEs accessing the NPN network will be returned by the NPN network to its home network. Therefore, the home network of the UE may receive a large amount of signaling requests, such as registration request signaling, in a short time, which easily causes signaling overload of the home network, so that the UE cannot respond to the signaling requests timely, and thus may cause adverse consequences such as service interruption and even call drop of the UE, especially serious influence on the UE performing important services such as voice call.

In view of this, the present application provides a communication method and apparatus, which can avoid the problem that when a large number of UEs return to the home network from the NPN network, the signaling response of the terminal device is not timely due to the signaling overload of the home network.

The communication method provided in the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The communication method provided in the present application may be applied to the network architecture shown in any one of fig. 4 and fig. 5, and is not limited.

To facilitate an understanding of the embodiments of the present application, the following description is made:

(1) In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

(2) In the present application, "first" and "second" are merely for convenience of description, and are used for distinguishing objects, and are not used to limit the scope of the embodiments of the present application. Rather than to describe a sequence or order of features. It is to be understood that the objects so described may be interchanged where appropriate to enable description of aspects other than those of the embodiments of the application.

In the embodiment of the application, the terminal device accesses the service provided by the access network through the access network, and the access network can be an NPN, and the access network can be located in a theme park, a sports stadium, an international conference room, a playing place, and the like. The user/device accessing the service of the visited network may return to the home network, which may be a public network or a non-public network, after the end of the service provided by the visited network.

Fig. 6 shows a schematic diagram of a communication method 600 provided in an embodiment of the present application. The method 600 may include the following steps.

And S610, the mobile management network element in the first network sends third indication information to the terminal equipment.

Correspondingly, the terminal device receives the third indication information from the mobility management element.

Wherein the first network is a visited network; the third indication information may be used to indicate service information of a first service in the first network, where the first service includes a service that is about to end in the first network.

The service information may include a service description. The service description may be at least one of: service identification (service ID), service category (service category ID), service provider (service provider ID).

The service identifier may be, for example, a code corresponding to the service, and different codes may be used to identify different services.

The service category may be a voice service, a video service, a game service, a teleconference service, etc.

The provider of the service may be a code corresponding to the name of the vendor that identifies that the current network can support the service provided by the vendor.

Optionally, the service information may further include a service parameter. The service parameter indicates a related network parameter of the service.

Illustratively, the traffic parameter may include at least one of a data network name (data network name, DNN), single network slice selection assistance information (single network slice selection assistance information, S-nsai), and traffic type (traffic type).

It will be appreciated that there may be more than one service to be terminated in the first network, and thus the third indication information may be a list (list) of service information. For example, the list of service information is a service identifier list, and the service identifier list includes at least one service identifier; similarly, the list of service information may also be a list including at least one of the above service information.

And S620, the terminal equipment determines whether the second service is completely ended according to the third indication information and the service information of the second service.

The second service may be a service in the first network to which the terminal device accesses.

Specifically, the terminal device may determine, according to the third indication information, whether the service information of the first service includes service information of the second service, and if so, determine that all of the second service ends or all of the second service is about to end; otherwise, the terminal device determines that all or part of the second service is not ended.

In the case that the service information is a service description, taking the service information as a service identifier as an example, assuming that the service information of the first service indicated by the third indication information includes a service identifier #1, a service identifier #2 and a service identifier #3, if the terminal device determines that the service information of the second service is at least one of the service identifier #1 to the service identifier #3, the terminal device determines that the second service is all ended.

Taking the service information as DNN as an example when the service information is a service parameter, the terminal device can determine whether the DNN corresponding to the first service includes the DNN corresponding to the second service according to the third indication information, and if so, the terminal device determines that the second service is all ended; otherwise, the terminal device determines that all or part of the second service is not ended.

It will be appreciated that in case the terminal device determines that the second service is not all ended, the terminal device may continue to access the first network and subsequent steps may not be performed. Thereby ensuring that the unfinished service accessed by the terminal equipment currently is not affected.

In the case that the terminal device determines that the second service is all ended, the method further includes:

s630, the terminal equipment sends the first information to the mobile management network element.

Accordingly, the mobility management element receives the first information from the terminal device.

The first information may include first indication information and access status information. Wherein the first indication information indicates whether the terminal device detects an access network of the second network; the access status information includes whether the terminal device accesses the second network through the first network.

Optionally, before sending the first information to the mobility management element, the terminal device may determine whether the second network is detected and whether to access the second network through the first network.

Specifically, the terminal device may determine whether the second network is detected or whether there is coverage of the second network by detecting the signal quality of the second network in the area where the terminal device is located.

Illustratively, if the terminal device detects that the signal quality of the second network is greater than a threshold in the current area, the terminal device determines that the second network is detected; otherwise, the terminal device is considered to not detect the second network.

It will be appreciated that detecting the second network may also be understood as detecting the access network of the second network, since the signal quality is that of the access network of the second network.

The terminal device may determine whether to access the second network through the first network according to its access status information.

The terminal device may be configured to store registration information for the terminal device, and determine to access the second network via the first network if the registration information includes access to the second network via the first network.

The registration information of the terminal device is information that the terminal device registers to the core network, so it can be understood that the second network is accessed through the first network can be understood as the core network accessing the second network through the first network.

According to the access state information of the terminal device and the coverage condition of the second network of the current area detected by the terminal device, the current state of the terminal device can comprise four conditions.

In the first case, the terminal device accesses to a second network through the first network, and detects the second network.

In this case, the access status information of the terminal device and the network coverage of the second network are as shown in fig. 7 (a).

And in the second case, the terminal equipment is not accessed to a second network through the first network, and the second network is detected.

In this case, the access status information of the terminal device and the network coverage of the second network are as shown in (b) of fig. 7.

And thirdly, the terminal equipment accesses a second network through the first network, and the second network is not detected.

In this case, the access status information of the terminal device and the network coverage of the second network are as shown in (c) of fig. 7.

And in the fourth case, the terminal equipment does not access the second network through the first network, and the second network is not detected.

In this case, the access status information of the terminal device and the network coverage of the second network are as shown in (d) of fig. 7.

According to the current access state and the detected coverage condition of the second network, the terminal device can report first information indicating any one of the four conditions. Alternatively, the first information may have four forms according to the access status of the terminal device itself and the detected coverage of the second network. The four forms of the first information correspond to the four cases, and are not described in detail.

Optionally, if the current access state of the terminal device and the detected coverage situation of the second network are any one or more of the first to third cases, the first information reported by the terminal device may further include an identifier of the second network.

Illustratively, where the second network is a PLMN, the identity of the second network may be a PLMN ID; in the case where the second network is a SNPN, the identity of the second network may be PLMN id+nid.

And S640, the mobile management network element sends second indication information to the terminal equipment according to the first information.

Correspondingly, the terminal device receives the second indication information from the mobility management network element.

The second indication information may be used to indicate an opportunity for the terminal device to send signaling to the second network.

It may be understood that the terminal device sends signaling to the second network, that is, sends signaling to a network element in the second network. For example, the terminal device sends signaling to a mobility management network element in the second network. Alternatively, the terminal device may send signaling to the access network device in the second network. The signaling sent by the terminal device may be, for example, a registration request, a packet data unit (protocol data unit, PDU) session establishment request, etc.

The second indication information may be duration indication information, where the duration indication information indicates that the terminal device sends signaling to the second network after the duration indicated by the duration indication information. For example, the duration indication information is a configuration value of the timer, and after receiving the configuration value, the terminal device may send signaling to the second network after the timer indicated by the configuration value finishes counting.

Specifically, according to the difference of the first information reported by the terminal device, the mobility management network element allocates duration indication information indicating different durations to the terminal device.

If the mobility management network element determines that the terminal equipment accesses the second network through the first network according to the first information, and the terminal equipment detects the second network, the mobility management network element allocates first time length indication information for the terminal equipment, wherein the first time length indication information indicates the first time length;

if the mobility management network element determines that the terminal device does not access the second network through the first network according to the first information, and the terminal device detects the second network, the mobility management network element allocates second duration indication information to the terminal device, where the second duration indication information indicates the second duration.

If the mobility management network element determines that the terminal device accesses the second network through the first network according to the first information, and the terminal device does not detect the second network, the mobility management network element allocates third duration indication information to the terminal device, where the third duration indication information indicates the third duration.

If the mobility management network element determines that the terminal device does not access the second network through the first network according to the first information and the terminal device does not detect the second network, the mobility management network element allocates fourth time length indication information to the terminal device, wherein the fourth time length indication information indicates the fourth time length.

For example, the mobility management network element may configure the terminal device of the second network coverage that detects different conditions for different access states to allocate different duration value intervals. For example, for a terminal device accessing a second network through a first network and detecting the second network, the duration value interval is a first interval; aiming at terminal equipment which is not accessed to a second network through a first network and detects the second network, the duration value interval is a second interval; aiming at terminal equipment which accesses a second network through a first network and does not detect the second network, the duration value interval is a third interval; the time length value interval is a fourth interval aiming at the terminal equipment which accesses the second network through the first network and does not detect the second network.

The maximum value of the first section may be less than or equal to the minimum value of the second section, the maximum value of the second section may be less than or equal to the minimum value of the third section, and the maximum value of the third section may be less than or equal to the minimum value of the fourth section. The first duration, the second duration, the third duration, and the fourth duration may be random values in the first interval, the second interval, the third interval, and the fourth interval, respectively.

Optionally, if the first information includes an identifier of the second network, the mobility management element may obtain a set of duration indication information corresponding to the second network according to the identifier of the second network. The duration indicated by the duration indication information may be from a set of duration value intervals corresponding to the second network identifier.

For example, the set of duration indicating information corresponding to the second network may include the first duration indicating information, the second duration indicating information, the third duration indicating information, and the fourth duration indicating information.

That is, in the case that the first information includes the identifier of the second network, the duration indication information allocated by the mobility management network element to the terminal device is duration indication information corresponding to the identifier of the second network. Or, the mobility management network element may configure or acquire duration indication information corresponding to different second networks, and the mobility management network element may acquire the duration indication information corresponding to the second networks according to the identifier of the second network included in the first information.

Optionally, S650, the terminal device sends signaling to the network element in the second network according to the second indication information.

Specifically, the terminal device may send signaling to a network element in the second network, for example, a mobility management network element, after the duration indicated by the duration indication information.

Based on the above scheme, the mobility management network element can allocate different duration indication information to the terminal device based on the access state of the terminal device and the condition of the home network, so that the terminal device can send signaling to the home network at a proper time, and the communication reliability of the terminal device is ensured.

It can be appreciated that, based on the above scheme, the mobility management network may allocate different duration indication information to different terminal devices according to different access states of different terminal devices and the situation that the home network is detected. Therefore, when a large number of terminal devices return to the home network, signaling can be initiated to the home network at different times, and the problem of untimely signaling response of the terminal devices caused by signaling overload of the home network is avoided.

Furthermore, based on the scheme, the terminal equipment with high priority can be guaranteed to return to the home network preferentially. A terminal device with a high priority may be understood as a terminal device that needs to access the home network more timely, for example, if the terminal device detects the home network, the terminal device may access the home network preferentially, and the terminal device may be considered as a terminal device with a high priority compared to a terminal device that does not detect the home network.

Fig. 8 shows a schematic diagram of a communication method 800 according to an embodiment of the present application. As shown in fig. 8, the method includes the following steps.

S801, amf#1 transmits instruction information #1 to ue#1.

Accordingly, the UE receives the indication information #1 from AMF #1.

Wherein, the AMF#1 is AMF in SNPN, and the UE#1 is any UE accessing the SNPN.

The indication information #1 (an example of the third indication information) may indicate a service to be terminated in the SNPN.

Illustratively, the indication information includes service information of the service to be ended. The service information may refer to the description in S610.

S802, the UE #1 determines whether all the accessed SNPN services are ended according to the indication information #1.

Specifically, the ue#1 determines whether the service to be ended in the SNPN includes all the services of the SNPN accessed by the ue#1 according to the received indication information #1 from the amf#1, and if so, the ue#1 determines that all the services of the accessed SNPN are ended or all the services are to be ended.

For example, the services of the SNPN network accessed by the current UE #1 include a service #1 and a service #2, and the indication information #1 indicates that the service #1, the service #2, and the service #2 in the SNPN network are about to end, and the UE #1 determines that the services in the SNPN network accessed by the current UE #1 are all ended or all about to end.

In the case that the accessed SNPN network service is determined to be completely ended or is completely about to be ended, the method further comprises:

s803, ue#1 determines its own access state information and the detected coverage of the home network.

The home network of ue#1 may be PLMN or SNPN. Hereinafter, a PLMN will be described as an example of the home network of ue#1.

Specifically, the access status information of ue#1 includes whether ue#1 accesses PLMN through SNPN; the coverage situation of the home network detected by ue#1 includes whether ue#1 detects the home network.

Illustratively, ue#1 may determine whether to access the PLMN through the SNPN through its own registration information. Whether ue#1 accesses the PLMN through the SNPN may be understood as whether ue#1 accesses the core network of the PLMN through the SNPN.

UE #1 may determine whether PLMN coverage exists in the current area by detecting signal quality of the PLMN network of the current area. For example, if ue#1 detects that the signal quality of the current PLMN is greater than a threshold, ue#1 determines that PLMN coverage exists for the current area, or that ue#1 detects the PLMN.

It will be appreciated that the signal quality of the PLMN detected by UE #1 is the signal quality of the PLMN access network, and that UE #1 detects a PLMN may be understood as the access network of the PLMN detected by UE # 1.

S804, ue#1 transmits information #1 to amf#1.

Accordingly, amf#1 receives information#1 from ue#1.

Specifically, ue#1 is in different access states, and whether PLMN is detected, information#1 reported by ue#1 may be different.

Illustratively, the information #1 includes information that the UE #1 accesses the PLMN through the SNPN and detects the PLMN.

Alternatively, the information #1 includes information that the UE #1 does not access the PLMN through the SNPN and detects the PLMN.

Alternatively, the information #1 includes information that the UE #1 accesses the PLMN through the SNPN and the PLMN is not detected.

Alternatively, the information #1 includes information that the UE #1 does not access the PLMN network through the SNPN network and does not detect the PLMN.

Optionally, in case ue#1 accesses the PLMN through the SNPN and/or detects the PLMN, the information#1 may further include a PLMN ID.

S805, amf#1 transmits a random value #1 to ue#1 according to information #1.

Accordingly, ue#1 receives the random value #1 from amf#1.

The random value #1 is an example of the duration instruction information in S640. The random value #1 may be a configuration value of a back-off timer (back-off timer). Alternatively, the random value #1 indicates the back-off timer timing. After the back-off timer expires, ue#1 may send signaling to a network element (e.g., AMF) in the PLMN.

According to the difference of the information #1 reported by the UE #1, the value ranges of the back-off timer configuration values sent to the UE #1 by the AMF #1 are different. Alternatively, according to the difference of the information #1, the AMF #1 assigns the random value #1 to the UE #1 from different value ranges.

Specifically, if the information #1 reported by the UE #1 includes that the UE #1 accesses the PLMN through the SNPN, and the UE #1 detects the PLMN, the AMF #1 allocates the random value #1 to the UE #1 from the section #1.

If the information #1 reported by the UE #1 includes that the UE #1 does not access to the PLMN through the SNPN, and the UE #1 detects the PLMN, the AMF #1 allocates the random value #1 to the UE #1 from the section # 2.

If the information #1 reported by the UE #1 includes that the UE #1 accesses the PLMN through the SNPN, and the UE #1 does not detect the PLMN, the AMF #1 allocates the random value #1 to the UE #1 from the section # 3.

If the information #1 reported by the UE #1 includes that the UE #1 does not access to the PLMN through the SNPN and the UE #1 does not detect the PLMN, the AMF #1 allocates the random value #1 to the UE #1 from the section # 4.

The maximum value of the section #1 may be smaller than the minimum value of the section #2, the maximum value of the section #2 may be smaller than the minimum value of the section #3, and the maximum value of the section #3 may be smaller than the minimum value of the section # 4.

Optionally, when the information #1 includes a PLMN ID, the section #1, the section #2, the section #3, and the section #4 are a set of random value valued sections corresponding to the PLMN ID. After receiving the information #1, the AMF #1 may obtain the set of random value intervals according to the PLMN ID; AMF#1 assigns the random value #1 to UE#1 from one of the set of random value valued intervals based on information whether the UE#1 accesses the PLMN through SNPN and whether UE#1 detects the PLMN.

Optionally, at S806, ue#1 sends signaling to the network element in the PLMN after the back-off timer is over.

This step is described with reference to S650, and will not be described again.

Based on the scheme, the AMF in the SNPN can allocate different random values for the UE based on the access state information of the UE and the condition of the home network, and the random values indicate the timing of the back-off timer, so that the terminal equipment can send signaling to the home network after the back-off timer is finished, and the communication reliability of the terminal equipment is ensured.

It can be understood that based on the above scheme, the AMF may allocate different random values to different UEs according to different access states of different UEs and the situation of detecting the home network, so that when a large number of UEs return to the home network, signaling can be initiated to the home network at different times, and the problem of untimely signaling response of the UE caused by signaling overload of the home network is avoided.

Fig. 9 shows a schematic diagram of a communication device 900 according to an embodiment of the present application.

The apparatus 900 comprises a transceiver unit 910 and a processing unit 920, where the transceiver unit 910 may be configured to implement corresponding communication functions, the transceiver unit 910 may also be referred to as a communication interface or a communication unit, and the processing unit 920 may be configured to perform data processing.

Optionally, the apparatus 900 further includes a storage unit, where the storage unit may be configured to store instructions and/or data, and the processing unit 920 may read the instructions and/or data in the storage unit, so that the apparatus implements actions of different devices in the foregoing method embodiments, for example, actions of a mobility management network element or a terminal device.

In one possible design, the apparatus 900 may be a mobility management element in the foregoing embodiment, or may be a component (e.g., a chip) of the mobility management element. The apparatus 900 may implement steps or procedures performed by a mobility management network element corresponding to the above method embodiments. The transceiver unit 910 may be configured to perform operations related to the transceiver of the mobility management network element in the above method embodiment, for example, operations related to the transceiver of the mobility management network element in the embodiment shown in fig. 6, and operations related to the transceiver of the amf#1 in the embodiment shown in fig. 8; the processing unit 920 may be configured to perform operations related to processing by the mobility management element in the method embodiment described above, such as operations related to processing by the mobility management element in the embodiment shown in fig. 6, and operations related to processing by the amf#1 in the embodiment shown in fig. 8.

In another possible design, the apparatus 900 may be a terminal device in the foregoing embodiment, or may be a component (such as a chip) of the terminal device. The apparatus 900 may implement steps or procedures performed by a terminal device corresponding to the above method embodiments. The transceiver unit 910 may be configured to perform the operations related to the transceiving of the terminal device in the above method embodiment, for example, the operations related to the transceiving of the terminal device in the embodiment shown in fig. 6, and for example, the operations related to the transceiving of the ue#1 in the embodiment shown in fig. 8; the processing unit 920 may be configured to perform the operations related to the processing of the terminal device in the above method embodiment, such as the operations related to the processing of the terminal device in the embodiment shown in fig. 6, and such as the operations related to the processing of the ue#1 in the embodiment shown in fig. 8.

Fig. 10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. The apparatus 1000 includes a processor 1010, the processor 1010 being coupled to a memory 1020. Optionally, a memory 1020 is further included for storing computer programs or instructions and/or data, and the processor 1010 is configured to execute the computer programs or instructions stored in the memory 1020 or to read the data stored in the memory 1020 to perform the methods in the method embodiments above.

Optionally, the processor 1010 is one or more.

Optionally, the memory 1020 is one or more.

Alternatively, the memory 1020 may be integral with the processor 1010 or separate therefrom.

Optionally, as shown in fig. 10, the apparatus 1000 further comprises a transceiver 1030, the transceiver 1030 being configured to receive and/or transmit signals. For example, the processor 1010 is configured to control the transceiver 1030 to receive and/or transmit signals.

As an alternative, the apparatus 1000 is configured to implement the operations performed by the mobility management network element in the method embodiments above.

For example, the processor 1010 is configured to execute computer programs or instructions stored in the memory 1020 to implement the operations associated with the mobility management network element in the method embodiments above. For example, the method performed by the mobility management element in the embodiment shown in fig. 6, or the method performed by amf#1 in the embodiment shown in fig. 8.

Alternatively, the apparatus 1000 is configured to implement the operations performed by the terminal device in the above method embodiments.

For example, the processor 1010 is configured to execute a computer program or instructions stored in the memory 1020 to implement the operations associated with the terminal device in the above respective method embodiments. For example, the method performed by the terminal device in the embodiment shown in fig. 6; as another example, the method performed by ue#1 in the embodiment shown in fig. 8.

In implementation, the steps of the methods described above may be performed by integrated logic circuitry in hardware in processor 1010 or by instructions in software. The method disclosed in connection with the embodiments of the present application may be embodied directly in hardware processor execution or in a combination of hardware and software modules in a processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 1020 and the processor 1010 reads information from the memory 1020 and performs the steps of the method described above in conjunction with its hardware. To avoid repetition, a detailed description is not provided herein.

It should be appreciated that in the embodiments of the present application, the processor may be one or more integrated circuits configured to execute related programs to perform the embodiments of the methods of the present application.

A processor (e.g., processor 1010) may include one or more processors and be implemented as a combination of computing devices. The processor may each include one or more of the following: microprocessors, microcontrollers, digital signal processors (digital signal processor, DSPs), digital signal processing devices (digital signal processing device, DSPD), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA), programmable logic devices (programmable logic device, PLD), gate logic, transistor logic, discrete hardware circuits, processing circuits, or other suitable hardware, firmware and/or combinations of hardware and software for executing the various functions described in this disclosure. The processor may be a general purpose processor or a special purpose processor. For example, the processor 1010 may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data. The central processor may be used to cause the device to execute a software program and process data in the software program. In addition, a portion of the processor may also include nonvolatile random access memory. The processor may also store information of the device type, for example.

The procedure in this application is used in a broad sense to represent software. Non-limiting examples of software include: program code, program, subroutine, instructions, instruction set, code segments, software modules, applications, or software applications, or the like. The program may run in a processor and/or a computer. Such that the apparatus performs the various functions and/or processes described herein.

The memory (e.g., memory 1020) may store data required by a processor (e.g., processor 1010) when executing software. The memory may be implemented using any suitable memory technology. For example, memory may be any available storage media that can be accessed by a processor and/or computer. Non-limiting examples of storage media include: random access memory (random access memory, RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), compact Disc-ROM (CD-ROM), static RAM, dynamic RAM, DRAM, synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM, DRAM), synchronous DRAM (DRAM), removable media, optical disk storage media, magnetic storage devices, flash memory, registers, state memory, remote mount memory, local or remote memory components, or any other medium capable of carrying or storing software, data, or information and being accessed by a processor/computer. It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory (e.g., memory 1020) and the processor (e.g., processor 1010) may be provided separately or integrated together. The memory may be used in connection with the processor such that the processor can read information from, store information in, and/or write information to the memory. The memory may be integrated in the processor. The memory and processor may be provided in an integrated circuit (e.g., the integrated circuit may be provided in a UE or other network node).

Fig. 11 is a schematic block diagram of a chip system 1100 provided by an embodiment of the present application. The system-on-chip 1100 (or may also be referred to as a processing system) includes logic 1110 and input/output interface 1120.

Logic 1110 may be a processing circuit in system-on-chip 1100. Logic 1110 may be coupled to a memory unit to invoke instructions in the memory unit so that system-on-chip 1100 may implement the methods and functions of embodiments of the present application. The input/output interface 1120 may be an input/output circuit in the chip system 1100, and outputs information processed by the chip system 1100, or inputs data or signaling information to be processed into the chip system 1100 for processing.

As an option, the system on a chip 1100 is configured to implement the operations performed by the mobility management network element in the various method embodiments above.

For example, the logic circuit 1110 is configured to implement the operations related to the processing performed by the mobility management element in the method embodiment, for example, the operations related to the processing performed by the mobility management element in the embodiment shown in fig. 6, or the operations related to the processing performed by the amf#1 in the embodiment shown in fig. 8; the input/output interface 1120 is configured to implement the operations related to transmission and/or reception performed by the mobility management element in the above method embodiment, for example, the operations related to transmission and/or reception performed by the mobility management element in the embodiment shown in fig. 6, or the operations related to transmission and/or reception performed by the amf#1 in the embodiment shown in fig. 8.

Alternatively, the chip system 1100 is used to implement the operations performed by the terminal device in the above method embodiments.

For example, the logic circuit 1110 is configured to implement the processing-related operations performed by the terminal device in the above method embodiment, for example, the processing-related operations performed by the terminal device in the embodiment shown in fig. 6, and for example, the processing-related operations performed by the ue#1 in the embodiment shown in fig. 8; the input/output interface 1120 is configured to implement the operations related to transmission and/or reception performed by the terminal device in the above method embodiment, for example, the operations related to transmission and/or reception performed by the terminal device in the embodiment shown in fig. 6, and the operations related to transmission and/or reception performed by the UE #1 in the embodiment shown in fig. 8.

The embodiments of the present application also provide a computer readable storage medium having stored thereon computer instructions for implementing the method performed by the communication device (e.g., the mobility management element, and also e.g., the terminal device) in the above method embodiments.

Embodiments of the present application also provide a computer program product containing instructions that, when executed by a computer, implement a method performed by a communication device (e.g., a mobility management element, also e.g., a terminal device) in the above method embodiments.

The embodiment of the application also provides a communication system, which comprises the mobile management network element and the terminal equipment in each embodiment.

The explanation and beneficial effects of the related content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described division of units is merely a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Furthermore, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to implement the solution provided in the present application.

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

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

When implemented in software, 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 program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. For example, the computer may be a personal computer, a server, or a network device, etc. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. With respect to computer readable storage media, reference may be made to the description above.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

a mobility management network element in a first network receives first information from a terminal device, wherein the first information comprises first indication information and access state information, the first indication information indicates whether the terminal device detects an access network of a second network, and the access state information comprises whether the terminal device accesses a core network of the second network through the first network;

and the mobile management network element sends second indication information to the terminal equipment according to the first information, wherein the second indication information indicates the time when the terminal equipment sends signaling to the network element of the second network.

2. The method according to claim 1, characterized in that before the mobility management network element in the first network receives the first information from the terminal device, the method further comprises:

The mobile management network element sends third indication information to the terminal equipment, wherein the third indication information indicates service information of a first service, and the first service comprises a service to be ended in the first network.

3. The method of claim 2, wherein the traffic information comprises at least one of:

service identification, service type identification, service provider identification, data network DNN information, network slicing and traffic type.

4. A method according to any one of claims 1 to 3, wherein the mobile management network element sending second indication information to the terminal device according to the first information, comprising:

the mobility management network element determines duration indicating information according to the first information, wherein the duration indicating information is used for indicating the terminal equipment to send signaling to the network element of the second network after the duration;

and the mobile management network element sends the second indication information to the terminal equipment, wherein the second indication information comprises the duration indication information.

5. The method of claim 4, wherein the determining, by the mobility management network element, duration indication information based on the first information comprises:

The mobile management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first information, the terminal equipment detects an access network of the second network, and the duration indication information is first duration indication information; or,

the mobile management network element determines that the terminal equipment does not access a core network of the second network through the first network according to the first information, the terminal equipment detects an access network of the second network, and the duration indication information is second duration indication information; or,

the mobile management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first information, the terminal equipment does not detect an access network of the second network, and the duration indication information is third duration indication information; or,

the mobile management network element determines that the terminal equipment does not access a core network of the second network through the first network according to the first information, the terminal equipment does not detect an access network of the second network, and the duration indication information is fourth duration indication information;

The first time period is smaller than the second time period, the second time period is smaller than the third time period, and the third time period is smaller than the fourth time period.

6. A method according to any one of claims 1 to 3, characterized in that the first information further comprises an identification of the second network on condition that the terminal device satisfies a core network accessing the second network through the first network, at least one of the access networks of the second network is detected.

7. The method according to claim 6, wherein the mobile management network element sending second indication information to the terminal device according to the first information, comprises:

the mobile management network element obtains a group of duration indication information corresponding to the second network according to the identifier of the second network, wherein the duration indication information is used for indicating the terminal equipment to send signaling to the network element of the second network after the duration;

the mobility management network element determines one duration indication information in the group of duration indication information according to the first indication information and the access state information;

8. The method of claim 7, wherein the set of duration indication information corresponding to the second network includes a first duration indication information, a second duration indication information, a third duration indication information, and a fourth duration indication information, wherein the first duration is less than the second duration, the second duration is less than the third duration, the third duration is less than the fourth duration, and the mobility management element determines one duration indication information of the set of duration indication information according to the first indication information and the access state information, and comprises:

the mobile management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment detects the access network of the second network, wherein the one duration indication information is the first duration indication information; or,

the mobile management network element determines that the terminal equipment does not access a core network of the second network through the first network according to the first indication information and the access state information, and the terminal equipment detects the access network of the second network, wherein the one duration indication information is the second duration indication information; or,

The mobile management network element determines that the terminal equipment accesses a core network of the second network through the first network according to the first indication information and the access state information, the terminal equipment does not detect the access network of the second network, and the one duration indication information is the third duration indication information; or,

the mobile management network element determines that the terminal equipment does not access the core network of the second network through the first network according to the first indication information and the access state information, the terminal equipment does not detect the access network of the second network, and the duration indication information is the fourth duration indication information.

9. The method of any one of claims 1 to 8, wherein the first network is a non-public network deployed independently.

10. The method according to any of claims 1 to 9, wherein the second network is a public land mobile network or a non-public network deployed independently.

11. A method of communication, comprising:

the method comprises the steps that terminal equipment sends first information to a mobile management network element in a first network, wherein the first information comprises first indication information and access state information, the first indication information indicates whether the terminal equipment detects an access network of a second network, and the access state information comprises whether the terminal equipment accesses a core network of the second network through the first network;

The terminal equipment receives second indication information from the mobile management network element, wherein the second indication information is sent according to the first information, and the second indication information indicates the time when the terminal equipment sends signaling to the network element of the second network.

12. The method according to claim 11, characterized in that before the terminal device sends the first information to a mobility management network element in the first network, the method further comprises:

the terminal equipment determines whether an access network of the second network is detected according to the signal quality of the current area;

and the terminal equipment determines whether to access the core network of the second network through the first network according to the access state of the terminal equipment.

13. The method according to claim 12, wherein the first information further comprises an identification of the second network if the terminal device determines that an access network of the second network is detected according to the signal quality of the current area, and/or the terminal device determines that a core network of the second network is accessed through the first network according to its access status.

14. The method according to claim 11, characterized in that before the terminal device sends the first information to a mobility management network element in the first network, the method further comprises:

The terminal equipment receives third indication information from the mobile management network element, wherein the third indication information indicates service information of a first service, and the first service comprises a service to be ended in the first network;

and the terminal equipment determines that the second service is completely ended according to the third indication information, wherein the second service comprises the service in the first network which is accessed by the terminal equipment currently.

15. The method of claim 14, wherein the traffic information comprises at least one of:

16. The method according to claim 15, wherein the terminal device determining that the second service is all ended according to the third indication information comprises:

and if the terminal equipment determines that the service information of the first service comprises the service information of the second service according to the third indication information, the terminal equipment determines that the second service is completely ended.

17. The method according to any of claims 11 to 16, wherein the second indication information comprises duration indication information for indicating that the terminal device sends signaling to a network element of the second network after the duration.

18. The method of claim 17, wherein the step of determining the position of the probe is performed,

the first information comprises a core network of the second network accessed by the terminal equipment through the first network, the terminal equipment detects the access network of the second network, and the duration indication information is first duration indication information; and/or the number of the groups of groups,

the first information comprises a core network of the second network which is not accessed by the terminal equipment through the first network, the terminal equipment detects the access network of the second network, and the duration indication information is second duration indication information; and/or the number of the groups of groups,

the first information comprises a core network of the second network accessed by the terminal equipment through the first network, the access network of the second network is not detected by the terminal equipment, and the duration indication information is third duration indication information; and/or the number of the groups of groups,

the first information comprises a core network of the second network which is not accessed by the terminal equipment through the first network, the access network of the second network is not detected by the terminal equipment, and the duration indication information is fourth duration indication information;

19. The method of any one of claims 11 to 18, wherein the first network is a non-public network deployed independently.

20. The method according to any of claims 11 to 19, wherein the second network is a public land mobile network or a non-public network deployed independently.

21. A communication device, comprising:

a unit or module comprising means for performing the method of any one of claims 1 to 20.

22. A communication device, comprising:

at least one processor configured to execute a computer program stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 10 or any one of claims 11 to 20.

23. The apparatus of claim 22, further comprising the memory and/or a communication interface coupled with the processor,

the communication interface is used for inputting and/or outputting information.

24. A communication system is characterized by comprising a mobile management network element and a terminal device,

the mobility management network element being adapted to perform the method of any one of claims 1 to 10, the terminal device being adapted to perform the method of any one of claims 11 to 20.

25. A computer-readable storage medium comprising,

the computer readable storage medium having stored thereon a computer program which, when run on a computer, causes the computer to perform the method of any of claims 1 to 10 or any of claims 11 to 20.

26. A computer program product, characterized in that,

the computer program product comprising instructions for performing the method of any one of claims 1 to 10, or of any one of claims 11 to 20.