WO2021163855A1

WO2021163855A1 - Information sending method, receiving method, apparatus, device, and storage medium

Info

Publication number: WO2021163855A1
Application number: PCT/CN2020/075589
Authority: WO
Inventors: 刘建华; 杨皓睿
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2021-08-26
Also published as: CN114747254A

Abstract

The present application relates to the technical field of communications, and disclosed therein are an information sending method, a receiving method, an apparatus, a device, and a storage medium. The information sending method comprises: in the situation in which a terminal device detects that a first system cannot be used, the terminal device sends first information to a network device in a second system, the first information being used for informing the network device in the second system that the first system cannot be used. The embodiments of the present application can prevent a network device in the system in which a terminal device is currently located from redirecting the terminal device to another system after receiving a registration request of the terminal device, such that the terminal device promptly acquires a network service. Furthermore, in the embodiments of the present application, the network device in the current system can be prevented from redirecting the terminal device again to another system when processing the registration request of the terminal device, preventing the terminal device from switching back and forth between the current system and another system, reducing the delay of the terminal device acquiring a network service, and improving the efficiency of the terminal device accessing a communication system.

Description

Information sending method, receiving method, device, equipment and storage medium

Technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to an information sending method, receiving method, device, device, and storage medium.

Background technique

CIoT (Cellular Internet of Things) is a kind of CIoT terminal connection through NB-IoT (Narrowband Internet of Things) access technology or eMTC (Enhanced Machine Type Communication) access technology. The Internet of Things into the mobile communication network.

A typical CIoT system is EPS (Evolved Packet System). In order to meet the needs of higher-speed services, 3GPP (3rd Generation Partnership Project) defines 5GS (5th Generation System, the fifth generation mobile communication system). CIoT terminal equipment supporting 5GS system and EPS system can be connected to 5GS system or EPS system. However, when CIoT terminal equipment is connected to the 5GS system, the 5GS system can redirect the CIoT terminal equipment to the EPS system according to the operator’s policy or load balancing requirements; or, when the CIoT terminal equipment is connected to the EPS system, according to the operator’s policy or For load balancing requirements, the EPS system can redirect CIoT terminal devices to the 5GS system.

At present, the issue of redirection of terminal devices needs further discussion.

Summary of the invention

The embodiments of the present application provide an information sending method, receiving method, device, equipment, and storage medium. The technical solution is as follows:

On the one hand, an embodiment of the present application provides an information sending method, which is applied to a terminal device, and the method includes:

In the case of detecting that the first system is unavailable, sending the first information to the network device in the second system;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.

On the other hand, an embodiment of the present application provides an information receiving method, which is applied to a network device of a second system, and the method includes:

Receiving first information sent by a terminal device, where the first information is sent when the terminal device detects that the first system is unavailable;

In still another aspect, an embodiment of the present application provides an information sending device, which is applied to a terminal device, and the device includes:

The first information sending module is configured to send the first information to the network device in the second system when it is detected that the first system is unavailable;

In another aspect, an embodiment of the present application provides an information receiving device, which is applied to a network device of a second system, and the device includes:

The first information receiving module is configured to receive first information sent by a terminal device, where the first information is sent when the terminal device detects that the first system is unavailable;

In another aspect, an embodiment of the present application provides a terminal device, the terminal device including a processor and a transceiver connected to the processor; wherein:

The transceiver is configured to send first information to a network device in the second system when it is detected that the first system is unavailable;

In yet another aspect, an embodiment of the present application provides a network device. The network device is in a second system, and the network device includes a processor and a transceiver connected to the processor; wherein:

The transceiver is configured to receive first information sent by a terminal device, where the first information is sent by the terminal device when it detects that the first system is unavailable;

Wherein, the first information is used to inform the network device that the first system is unavailable.

In another aspect, an embodiment of the present application provides a computer-readable storage medium in which a computer program is stored, and the computer program is configured to be executed by a processor of a terminal device to implement the foregoing information sending method.

In yet another aspect, an embodiment of the present application provides a computer-readable storage medium in which a computer program is stored, and the computer program is configured to be executed by a processor of a network device in a second system to implement the above Information receiving method.

In another aspect, an embodiment of the present application provides a chip including a programmable logic circuit and/or program instructions, and when the chip runs on a terminal device, it is used to implement the above-mentioned information sending method.

In yet another aspect, an embodiment of the present application provides a chip that includes a programmable logic circuit and/or program instructions, and when the chip is running on a network device in a second system, it is used to implement the above-mentioned information Receiving method.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

When the terminal device detects that other systems other than the current system are unavailable, it sends information indicating that other systems are unavailable to the network device in the current system, so as to avoid the terminal device's current system. After receiving the registration request of the terminal device, the network device redirects the terminal device to other systems so that the terminal device can obtain network services in time. Moreover, in the embodiment of the present application, if the terminal device detects that the other system is unavailable after being redirected to another system by the network device in the current system, the terminal device sends to the network device in the current system Information used to indicate that other systems are unavailable, which can prevent the network device in the current system from redirecting the terminal device to other systems again when processing the registration request of the terminal device, and avoid the terminal device in the current system and other systems Switch back and forth between them, reducing the time delay for terminal equipment to obtain network services, and improving the efficiency of terminal equipment accessing the communication system.

Description of the drawings

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

FIG. 2 is a schematic diagram of an EPS system architecture provided by an embodiment of the present application;

Figure 3 is a schematic diagram of a 5GS system architecture provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a 5GS system architecture provided by another embodiment of the present application;

FIG. 5 is a flowchart of an information sending and receiving method provided by an embodiment of the present application;

FIG. 6 is a flowchart of a method for sending and receiving information according to another embodiment of the present application;

Fig. 7 is a block diagram of an information sending device provided by an embodiment of the present application;

FIG. 8 is a block diagram of an information sending device provided by another embodiment of the present application;

FIG. 9 is a block diagram of an information receiving device provided by an embodiment of the present application;

FIG. 10 is a block diagram of an information receiving device provided by another embodiment of the present application;

FIG. 11 is a structural block diagram of a terminal device provided by an embodiment of the present application;

Fig. 12 is a structural block diagram of a network device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions, and advantages of the present application clearer, the implementation manners of the present application will be described in further detail below in conjunction with the accompanying drawings.

The network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation to the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network architecture The evolution of and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

The technical solutions provided by the embodiments of this application can be applied to various communication systems, such as: GSM (Global System of Mobile Communication) system, CDMA (Code Division Multiple Access, code division multiple access) system, ECDMA (Wideband Code) Division Multiple Access, Broadband Code Division Multiple Access) system, GPRS (General Packet Radio Service, General Packet Radio Service), LTE (Long Term Evolution) system, FDD (Frequency Division Duplex, LTE Frequency Division Duplex) system, TDD (Time Division Duplex, LTE Time Division Duplex) system, UMTS (Universal Mobile Telecommunication System), WiMAX (Worldwide Interoperability for Microwave Access) communication system, 5GS or New Radio (New Radio) , NR) and so on.

Please refer to FIG. 1, which shows a schematic diagram of a system architecture provided by an embodiment of the present application. The system architecture may include: a terminal device 10, a first access network device 20, a first core network device 30, a second access network device 40, and a second core network device 50.

The terminal device 10 may refer to a UE, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user device. Optionally, the terminal device may also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop, wireless local loop) station, a PDA (Personal Digital Assistant, personal digital processing) , Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5GS or future evolution of PLMN (Pub1ic Land Mobile Network, public land mobile communication network) This is not limited in this embodiment of the present application. Optionally, the terminal device in the embodiment of the present application may be a CIoT terminal. CIoT terminals have the application characteristics of low cost, simple functions, low power consumption, and infrequent user data transmission.

The access network device is a device deployed in the access network to provide the terminal device 10 with a wireless communication function. The access network equipment may include various forms of macro base stations, micro base stations, relay stations, access points, and so on. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5GS system, they are called gNodeB or gNB; in the EPS system, they are called eNodeB. With the evolution of communication technology, the name "access network equipment" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 10 are collectively referred to as access network devices.

The core network device refers to a device that can provide the terminal device 10 with functions such as session management, mobility management, policy management, and security authentication. In the embodiment of the present application, the core network device is responsible for the access management and mobility management of the terminal device 10. Optionally, in the 5GS system, the core network equipment can be implemented as AMF (Core Access and Mobility Management Function, core network access and mobility management functions); in the EPS system, the core network equipment can be implemented as MME (Mobility Management Function). Entity, mobility management entity).

In the embodiment of the present application, the access network equipment includes a first access network equipment 20 and a second access network equipment 40, and the core network equipment includes a first core network equipment 30 and a second core network equipment 50, wherein the first access network equipment The network access device 20 and the first core network device 30 are network devices of the first system, and the second access network device 40 and the second core network device 50 are network devices of the second system. The first system and the second system are different systems. Optionally, the first system may be 5GS and the second system may be EPS; or, the first system may be EPS and the second system may be 5GS. It should be understood that the first system and the second system may also be other systems, which are not limited in the embodiment of the present application. In the scenario where the first system is EPS and the second system is 5GS, the first access network device 20 may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) or one or more eNodeBs in EUTRAN , The first core network device 30 may be an MME, the second access network device 40 may be a RAN (Radio Access Network, radio access network) or one or more gNBs in the RAN, and the second core network device 50 may be an AMF . Of course, if the first system and the second system are other existing systems or future systems, each network device in this application is a corresponding network device in these systems.

Fig. 2 shows a schematic diagram of the system architecture of the EPS system provided by an embodiment of the present application. As shown in Figure 2, the system architecture 200 may include the following network entities:

1. EUTRAN: A network composed of multiple eNodeBs (Evolved NodeBs), which implements wireless physical layer functions, resource scheduling and wireless resource management, wireless access control, and mobility management functions. The eNodeBs can be connected through the X2 interface, which can be used to transmit data during the X2-based handover process. The eNodeB is connected to the SGW (Serving Gateway) through the user plane interface SI-U, and uses GTP-U (General Packet Radio System General Tunneling Protocol User Plane, General Packet Radio System Tunneling Protocol User Plane) to transmit user data: The control plane interface SI-E is connected to the MME (Mobility Management Entity, mobility management entity), and the SI-AP protocol is used to implement functions such as radio access bearer control.

2. MME: Mainly responsible for all control plane functions of user and session management, including NAS (Non-Access-Stratum) signaling and security, tracking area list management (Tracking Area List) management, P- Selection of GW (Packet Date Network Gateway) and SGW, etc.

3. SGW: It is mainly responsible for data transmission, forwarding and routing switching of user equipment, and serves as a local mobility anchor point for user equipment switching between eNodeBs (set for each user, and only one SGW is used at each moment. Service).

4. P-GW: As the anchor point of the PDN (Packet Date Network) connection, it is responsible for the IP address allocation of the user equipment, the data packet filtering of the user equipment, the rate control, and the generation of charging information.

5. SGSN (Serving GPR Supporting Node, Serving GPRS Support Node): 2G access network GERAN (GSM/EDGE Radio Access Network, GSM/EDGE wireless access network), 3G access network UTRAN (Universal Terrestrial Radio Access Network, Universal Terrestrial Radio Access) and the access node of the EPS core network EPC are responsible for the establishment and data forwarding of the bearer from GERAN, UTRAN to EPC.

6. HSS (Home Subscriber Server): stores the subscription data of mobile users.

7. PCRF (Policy and Charging Rules Function): responsible for charging management and policy control, including PCC (Policy and Charging Control) rules, QoS (Quality of Service, quality of service) )rule.

Fig. 3 shows a schematic diagram of the system architecture of the 5GS system provided by an embodiment of the present application. As shown in FIG. 3, the system architecture 200 may include: UE, RAN, Core (core network) and DN. Among them, UE, RAN, and Core are the main components of the architecture. Logically, they can be divided into two parts: the user plane and the control plane. The control plane is responsible for the management of the mobile network, and the user plane is responsible for the transmission of business data. In the figure, the NG2 reference point is between the RAN control plane and the Core control plane, the NG3 reference point is between the RAN user plane and the Core user plane, and the NG6 reference point is between the Core user plane and the data network.

UE: It is the portal for mobile users to interact with the network. It can provide basic computing and storage capabilities, display service windows to users, and accept user input. The UE will adopt the next-generation air interface technology to establish a signal connection and data connection with the RAN, thereby transmitting control signals and service data to the mobile network.

RAN: Similar to a base station in a traditional network, it is deployed close to the UE to provide network access for authorized users in a specific area, and can use transmission tunnels of different quality to transmit user data according to the user's level and service requirements. The RAN can manage its own resources, make reasonable use of it, provide access services for the UE on demand, and forward control signals and user data between the UE and the core network.

Core: Responsible for maintaining the contract data of the mobile network, managing the network elements of the mobile network, and providing the UE with functions such as session management, mobility management, policy management, and security authentication. When the UE is attached, the UE is provided with network access authentication; when the UE has a service request, the UE is allocated network resources; when the UE is moving, the UE is updated with network resources; when the UE is idle, the UE is provided with a fast recovery mechanism: When the UE is detached, it releases network resources for the UE; when the UE has service data, it provides data routing functions for the UE, such as forwarding uplink data to the DN: or receiving the UE downlink data from the DN, forwarding it to the RAN, and then sending it to the UE .

DN: It is a data network that provides business services to users. Generally, the client is located in the UE and the server is located in the data network. The data network can be a private network, such as a local area network, or an external network that is not controlled by the operator, such as the Internet, or a private network jointly deployed by the operator. For example, to configure IMS (IP Multimedia Core Network Subsystem, IP multimedia) Network subsystem) services.

Figure 4 is a detailed architecture determined on the basis of Figure 3. The user plane of the core network includes UPF (User Plane Function); the control plane of the core network includes AUSF (Authentication Server Function), AMF, and SMF. , NSSF (Network Slice Selection Function), NEF (Network Exposure Function, Network Opening Function), NRF (NF Repository Function, Network Function Storage Function), UDM (Unified Data Management, Unified Data Management), PCF ( Policy Control Function, Policy Control Function), AF (Application Function, Application Function). The functions of these functional entities are as follows:

UPF: Perform user data packet forwarding according to SMF routing rules;

AUSF: Perform UE safety certification;

AMF: UE access management and mobility management;

SMF: UE session management;

NSSF: select network slice for UE;

NEF: Open network functions to third parties through the northbound API interface;

NRF: Provide storage function and selection function of network function entity information for other network elements;

UDM: User contracting context management;

PCF: User policy management;

AF: User application management.

In the architecture shown in Figure 4, the N1 interface is the reference point between UE and AMF; the N2 interface is the reference point between RAN and AMF, used for sending NAS messages, etc.; the N3 interface is the reference point between RAN and UPF, It is used to transmit user plane data, etc.; the N4 interface is the reference point between SMF and UPF, used to transmit information such as tunnel identification information of the N3 connection, data buffer indication information, and downlink data notification messages; the N6 interface is UPF and The reference point between DNs is used to transmit user plane data.

It should be noted that the name of the interface between the various network elements in FIG. 3 and FIG. 4 is only an example, and the name of the interface in a specific implementation may be other names, which is not specifically limited in the embodiment of the present application. The names of the various network elements (such as SMF, AF, UPF, etc.) included in FIG. 3 and FIG. 4 are only an example, and do not limit the functions of the network elements themselves. In 5GS and other networks in the future, the aforementioned network elements may also have other names, which are not specifically limited in the embodiment of the present application. For example, in a 6G network, some or all of the above-mentioned network elements may use the terminology in 5G, or may adopt other names, etc., which are uniformly explained here, and will not be repeated in the following. In addition, it should be understood that the name of the message (or signaling) transmitted between the various network elements described above is only an example, and does not constitute any limitation on the function of the message itself.

In an example, the above-mentioned system architecture shown in FIG. 1 may be used to execute the redirection method of the terminal device. Exemplarily, the first core network device 30 in the first system determines according to the capability information of the second system and the network behavior information expected in the second system carried in the registration request when the terminal device 10 registers in the first system The terminal device 10 is redirected to the second system. The first core network device 30 may instruct the first access network device 20 to trigger the handover process through the redirection indication information. Then, the first access network device 20 can trigger the inter-system handover by sending a handover demand message to the second core network device 50, so as to switch the terminal device from the first system to the second system, so that it can solve the problem between the two different systems. Redirection problem between. However, if after redirection, the terminal device cannot find a cell that supports connection in the second system, the terminal device re-initiates a registration request to the first system. At this time, the first system may re-register the terminal device according to the registration request of the terminal device. The device is redirected to the second system, which will cause a long delay for the terminal device to access the network, that is, the terminal device cannot obtain network services for a long period of time.

Based on this, the embodiments of the present application provide a method for sending and receiving information. When a terminal device detects that other systems other than the current system are unavailable, it sends instructions to the network device in the current system. Information that is unavailable to other systems, so as to prevent the network device in the system where the terminal device is currently located from redirecting the terminal device to other systems after receiving the terminal device's registration request, so that the terminal device can obtain network services in time. Moreover, in the embodiment of the present application, if the terminal device detects that the other system is unavailable after being redirected to another system by the network device in the current system, the terminal device sends to the network device in the current system Information used to indicate that other systems are unavailable, which can prevent the network device in the current system from redirecting the terminal device to other systems again when processing the registration request of the terminal device, and avoid the terminal device in the current system and other systems Switch back and forth between them, reducing the time delay for terminal equipment to obtain network services, and improving the efficiency of terminal equipment accessing the communication system.

In the following, the technical solution of the present application will be introduced and explained in combination with several exemplary embodiments.

Please refer to FIG. 5, which shows a flowchart of an information sending and receiving method provided by an embodiment of the present application. The method can be applied to the system architecture shown in FIG. 1 to FIG. 4. The method may include the following steps:

Step 510: When the terminal device detects that the first system is unavailable, it sends the first information to the network device in the second system.

When a terminal device accesses a communication system, it can first detect the system reachability of the communication system, that is, the terminal device can first detect whether the communication system is reachable, and if the communication system is reachable, it can access Enter the communication system and do not access the communication system if the communication system is unreachable. In the embodiment of the present application, the terminal device can detect the system reachability of the first system, and in the case of detecting that the first system is unreachable, that is, when the first system is unavailable, send it to the second system The network device sends the first message. Optionally, the above-mentioned first system is unavailable, including at least one of the following situations: the terminal device does not detect a cell that supports the first system, for example, the system information of the cell detected by the terminal device indicates that the first system cannot be connected The terminal equipment does not camp on the cell supporting the first system, for example, the channel quality of the cell supporting the first system is not sufficient for the terminal equipment to camp on, or the cell supporting the first system is prohibited from registering, etc.; the terminal equipment is in the first system A system cannot successfully register, for example, the first system rejects the registration request of the terminal device, or the terminal device does not have subscription information, etc.; the terminal device cannot successfully initiate a service in the first system, for example, the first system does not have business capabilities, etc.; The cell where the device resides in the first system does not support the desired service, for example, the first system does not support the CIoT service expected by the terminal device.

The network equipment in the second system may be the core network equipment in the second system. Optionally, the network equipment in the second system may be the core responsible for the access management and mobility management of terminal equipment in the second system. The network equipment, that is, the network equipment in the second system, can manage the network elements in the second system by mobility. When the second system is implemented as a 5GS system, the network equipment in the second system may be implemented as an AMF, and when the second system is implemented as an EPS system, the network equipment in the second system may be implemented as an MME. It should be understood that the second system may also be implemented as other communication systems, and the network devices in the second system are correspondingly implemented as core network devices with mobility management network element functions in other communication systems. In the embodiment of the present application, when the terminal device detects that the first system is unavailable, it may send first information to the network device in the second system. The first information is used to inform the network device in the second system of the first information. A system is unavailable, that is, after the network device in the second system receives the first information, it can be determined based on the first information that the first system cannot provide network services for the terminal device. Optionally, the first information is a registration request message, or the first information may be carried in a registration request message, and the registration request message is used to request registration in the second system. Optionally, the first information is sent when the terminal device is redirected from the second system to the first system and detects that the first system is unavailable, that is, the terminal device initiates a registration request to the second system twice , When a registration request is initiated to a network device in the second system for the first time, the network device in the second system redirects the terminal device to the first system, and then the terminal device detects that the first system is unavailable. A registration request is initiated to the network device in the second system for the second time. When the terminal device initiates the registration request for the second time, the registration request message sent to the network device in the second system can carry the first information, or the registration request message is The first information. Optionally, if the terminal device detects that the first system is unavailable before initiating a registration request to the network device in the second system for the first time, then the terminal device can send the first registration request to the network device in the second system. The registration request message sent when the registration request is initiated carries the first information, or the registration request message is the first information.

In an example, the first information does not include the capability information of the first system and/or the network behavior information expected by the terminal device in the first system. When the first information received by the second system does not include the capability information of the first system, the second system can confirm that the first system cannot provide network services for the terminal device; when the first information received by the second system does not include When the terminal device expects the network behavior information in the first system, the second system can confirm that the terminal device does not expect to access the first system. Furthermore, the second system can confirm that the first system is unavailable based on the first information, so that the The terminal device is redirected to the first system.

Exemplarily, when the first system is EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode; or, when the first system is 5GS, the capability information of the first system is used for Indicates whether the terminal device supports N1 mode.

Exemplarily, when the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS supports or does not support control plane optimization, EPS supports or does not support user plane optimization, In EPS, control plane optimization is the first choice or user plane optimization is the first choice, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression; or, when the first system is 5GS , The network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, in 5GS, control plane optimization is the first choice or user plane optimization is First choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.

In another example, the first information includes indication information used to indicate that the first system is unavailable. At this time, the network device in the second system can directly confirm that the first system is unavailable after receiving the first information, so that the terminal device is not redirected to the first system. Optionally, the indication information included in the first information may include: first indication information, used to indicate that the terminal device does not have the ability to access the first system; and/or, second indication information, used to indicate that the terminal device does not have the ability to access the first system Look forward to the network behavior of the first system. The terminal device’s inability to access the first system may be because the first system does not support the services expected by the terminal device, or because the terminal device does not have subscription information, or because the terminal device cannot reside in a cell that supports the first system. The embodiment of the present application does not limit the reason why the terminal device does not have the ability to access the first system. Optionally, in order to improve the processing of the instruction information by the network device in the second system and promptly respond to the instruction information of the terminal device, the first instruction information may only explicitly indicate that the terminal device does not have the ability to access the first system, It is not necessary to include the reason why the terminal device does not have the ability to access the first system, so as to avoid that the network device in the second system needs to confirm that the terminal device does not have the ability to access the first system based on this reason. Optionally, in order to improve the processing of the instruction information by the network device in the second system and respond to the instruction information of the terminal device in a timely manner, the second instruction information may only explicitly indicate that the terminal device does not expect the network behavior of the first system.

Although in the current scenario, the terminal device may not expect the network behavior of the first system, or the current terminal device does not have the ability to access the first system, but in a certain future scenario, the terminal device may expect the network of the first system Behavior, or the terminal device may have the ability to access the first system. If the network device in the second system that the terminal device accesses is not clear about the network device information that the terminal device expects in the first system, then the terminal device expects the network behavior of the first system, or the terminal device has access to the first system After the ability of the terminal device, the terminal device also needs to send instruction information to the network device in the second system again to indicate the network behavior information expected by the terminal device in the first system. Based on this, the embodiments of the present application provide a way to prevent the terminal device from sending instruction information to the network device in the second system multiple times, and avoid redundant signaling overhead. That is, optionally, the first information also includes : Network behavior information expected by the terminal device in the first system, and/or network behavior information expected by the terminal device in the second system. That is, when a terminal device initiates a registration request to a network device in the second system, it may carry indication information used to indicate that the first system is unavailable in the first information, and at the same time carry the terminal device's expectations in the first system. Network behavior information, and/or network behavior information expected by the terminal device in the second system. After receiving the first information, the network device in the second system can store the content in the first information to avoid When the second system becomes available later, the terminal device needs to send the network behavior expected in the first system to the network device in the second system again.

In a possible implementation manner, after the above-mentioned sending the first information to the network device in the second system, the method further includes: when the terminal device detects that the first system is available, sending an update to the network device in the second system Information; where the update information is used to inform the network equipment in the second system that the first system is available. After the terminal device sends the first information to the network device in the second system, the network device in the second system may send a registration response message to the terminal device, so that the terminal device can access the second system and receive the network service. In the embodiment of the present application, when the terminal device is connected to the second system, it can continue to detect the first system to determine whether the first system is available. When the terminal device detects that the first system is available, it can Send update information to the network device in the second system. The update information is used to inform the network device in the second system that the first system is available. After receiving the update information, the network device in the second system can update The terminal device is redirected to the first system. Optionally, the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and information used to indicate that the first system is available.

In summary, the technical solution provided by the embodiments of the present application sends a terminal device to the network device in the current system to indicate that the other system is not available when it detects that other systems other than the current system are unavailable. Therefore, the network device in the system where the terminal device is currently located is prevented from redirecting the terminal device to other systems after receiving the registration request of the terminal device, so that the terminal device can obtain network services in time. Moreover, in the embodiment of the present application, if the terminal device detects that the other system is unavailable after being redirected to another system by the network device in the current system, the terminal device sends to the network device in the current system Information used to indicate that other systems are unavailable, which can prevent the network device in the current system from redirecting the terminal device to other systems again when processing the registration request of the terminal device, and avoid the terminal device in the current system and other systems Switch back and forth between them, reducing the time delay for terminal equipment to obtain network services, and improving the efficiency of terminal equipment accessing the communication system.

In addition, the embodiment of the present application provides two kinds of content contained in the information used to indicate that other systems are unavailable. One is that the information does not contain the capability information of other systems or the network behaviors of other systems expected by the terminal device. After the network device in the current system receives the information sent by the terminal device, it can determine that other systems are unavailable according to the information, or the terminal device does not expect to access other systems, so as to further determine not to redirect the terminal device to other systems; The other is to include indication information indicating that other systems are unavailable in the information, so that the network device in the current system can directly determine not to redirect the terminal device to other systems after receiving the information sent by the terminal device. The network device in the current system judges whether to redirect the terminal device to another system.

In addition, in the technical solution provided by the embodiments of the present application, if the terminal device detects that other systems are available after accessing the current system, it can send update information to the network device in the current system to inform the current system. The network equipment in the current system is available to other systems, so the network equipment in the current system can determine whether to redirect the terminal equipment to other systems according to the update information, so as to meet the load balancing requirements.

The technical solution of the present application will be described below in conjunction with a specific example. Refer to Fig. 6, assuming that the first system is an EPS system and the second system is a 5GS system. At this time, the network equipment in the second system can be implemented as an AMF. The above information sending and receiving method includes the following steps:

Step 610: The terminal device sends a registration request message to the AMF; when the terminal device initiates a registration request to the AMF, it can send a registration request message to the AMF. The registration request message includes at least one of the following: capability information of the EPS system, 5GS system The ability information of the terminal equipment, the network behavior information expected by the terminal equipment in the EPS system, and the network behavior information expected by the terminal equipment in the 5GS system;

In step 620, the AMF redirects the terminal device to the EPS system; after receiving the registration request message of the terminal device, the AMF can redirect the terminal device from the AMF system to the EPS system according to load balancing requirements and operator policies. , AMF can instruct the access network equipment in the 5GS system to trigger the handover process through the redirection indication information, and then the access network equipment in the 5GS system sends a handover demand message to the MME to trigger the inter-system handover process;

In step 630, the terminal device detects the EPS system; after the AMF redirects the terminal device to the EPS system, the terminal device needs to first detect the EPS system to determine whether the EPS system is available. Optionally, the terminal device can detect whether the EPS system is available. There are cells supporting the EPS system, detecting whether the cells supporting the EPS system can be camped on, detecting whether the EPS system can successfully initiate services, and detecting whether the cells that can be camped in the EPS system support the desired service, etc.;

In step 640, when the terminal device detects that the EPS system is unavailable, it sends the first information to the AMF; when the terminal device encounters any of the following conditions during the detection process, it can be considered that the EPS system is unavailable: no EPS system support is detected The cell cannot be camped on to the cell that supports the EPS system, the service cannot be successfully initiated in the EPS system, and the cell that resides in the EPS system does not support the desired service. When the terminal device detects that the EPS system is unavailable, it sends first information to the AMF, where the first information is used to inform the AMF that the EPS system redirected to is unavailable;

In step 650, the AMF determines whether to redirect the terminal device to the EPS system based on the first information; after the AMF receives the first information of the terminal device, it can determine whether to redirect the terminal device according to the first information in combination with the load balancing strategy, etc. Redirect to EPS system;

In step 660, when the AMF determines not to redirect the terminal device to the EPS system, it sends a registration response message to the terminal device; when the EPS system is unavailable, in order to provide network services to the terminal device in time, the AMF can provide the terminal device Send a registration response message, and also confirm that the terminal device is connected to the 5GS system to obtain network services;

In step 670, the terminal device detects the EPS system; after the terminal device accesses the 5GS system and obtains network services, it can also continue to detect the first system so as to switch to the EPS system at any time in the future;

Step 680: When the terminal device detects that the first system is available, it sends update information to the AMF; when the terminal device detects that the first system is available, it can send update information to the AMF. The update information may include at least the following: One item of content: the capability information of the EPS system, the network behavior information expected by the terminal equipment in the EPS system, and the information used to indicate the availability of the EPS system;

In step 690, the AMF determines whether to redirect the terminal device to the EPS system according to the update information; after the AMF receives the update information of the terminal device, it can determine whether to redirect the terminal device to the EPS system based on the update information and combined with the load balancing strategy. EPS system.

It should be noted that, in the foregoing method embodiment, the technical solution of the present application is introduced and explained mainly from the perspective of interaction between the terminal device and the network device in the second system. The steps performed by the terminal device described above can be separately implemented as the information sending method on the terminal device side; the steps performed by the network device in the second system described above can be implemented separately as the information receiving method on the network device side of the second system.

The following are device embodiments of this application, which can be used to implement the method embodiments of this application. For details that are not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

Please refer to FIG. 7, which shows a block diagram of an information sending device provided by an embodiment of the present application. The device has the function of realizing the above-mentioned method example on the terminal device side, and the function can be realized by hardware, or by hardware executing corresponding software. The device can be the terminal device described above, or it can be set in the terminal device. As shown in FIG. 7, the apparatus 700 may include: a first information sending module 710.

The first information sending module 710 is configured to send first information to a network device in the second system when it is detected that the first system is unavailable; wherein, the first information is used to send first information to the second system The network device at informs that the first system is unavailable.

Optionally, the first information does not include capability information of the first system and/or network behavior information expected by the terminal device in the first system.

Optionally, when the first system is an evolved packet system EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode; or, in the first system, it is the fifth In the case of the mobile communication system 5GS, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.

Optionally, when the first system is an EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS support or non-support of control plane optimization, EPS support, or Does not support user plane optimization, control plane optimization is preferred in EPS, or user plane optimization is preferred, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression; or When the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, and In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.

Optionally, the first information includes indication information used to indicate that the first system is unavailable.

Optionally, the indication information includes: first indication information, used to indicate that the terminal device does not have the ability to access the first system; and/or, second indication information, used to indicate the terminal device The network behavior of the first system is not expected.

Optionally, the first information further includes: network behavior information expected by the terminal device in the first system, and/or network behavior information expected by the terminal device in the second system .

Optionally, the unavailability of the first system includes at least one of the following situations: the terminal device does not detect a cell that supports the first system; the terminal device does not camp on a cell that supports the first system Cell; the terminal device cannot successfully register in the first system; the terminal device cannot successfully initiate a service in the first system; the cell where the terminal device resides in the first system does not support Expected business.

Optionally, the first information is a registration request message, and the registration request message is used to request registration in the second system.

Optionally, the first information is sent when the terminal device is redirected from the second system to the first system, and it is detected that the first system is unavailable.

Optionally, as shown in FIG. 8, the apparatus 700 further includes: an update information sending module 720, configured to send an update to a network device in the second system when it is detected that the first system is available. Information; wherein the update information is used to inform network devices in the second system that the first system is available.

Optionally, the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and information used to indicate that the first system is available information.

Please refer to FIG. 9, which shows a block diagram of an information receiving device provided by an embodiment of the present application. The device has the function of realizing the example of the method on the network device side in the second system, and the function can be realized by hardware, or by hardware executing corresponding software. The device may be the network device in the second system described above, or may be set in the network device in the second system. As shown in FIG. 9, the device 900 may include: a first information receiving module 910.

The first information receiving module 910 is configured to receive first information sent by a terminal device, where the first information is sent by the terminal device when it detects that the first system is unavailable; where the first information is used Informing the network equipment in the second system that the first system is unavailable.

Optionally, when the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS support or non-support of control plane optimization, EPS support, or Does not support user plane optimization, control plane optimization is preferred in EPS, or user plane optimization is preferred, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression; or When the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, and In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.

Optionally, as shown in FIG. 10, the apparatus 900 further includes: an update information receiving module 920, configured to receive update information sent by the terminal device, where the update information is when the terminal device detects the first Sent when a system is available; wherein the update information is used to inform network devices in the second system that the first system is available.

It should be noted that, when the device provided in the above embodiment realizes its functions, only the division of the above-mentioned functional modules is used as an example for illustration. In actual applications, the above-mentioned functions can be allocated by different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.

Regarding the device in the foregoing embodiment, the specific manner in which each module performs operation has been described in detail in the embodiment of the method, and detailed description will not be given here.

Please refer to FIG. 11, which shows a schematic structural diagram of a terminal device 110 provided by an embodiment of the present application. For example, the terminal device may be the terminal device described above, and is used to execute the information sending method on the terminal device side described above. Specifically, the terminal device 110 may include: a processor 111, a receiver 112, a transmitter 113, a memory 114, and a bus 115.

The processor 111 includes one or more processing cores, and the processor 111 executes various functional applications and information processing by running software programs and modules.

The receiver 112 and the transmitter 113 may be implemented as a transceiver 116, and the transceiver 116 may be a communication chip.

The memory 114 is connected to the processor 111 through a bus 115.

The memory 114 may be used to store a computer program, and the processor 111 is used to execute the computer program to implement each step executed by the terminal device in the foregoing method embodiment.

In addition, the memory 114 may be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile or non-volatile storage device includes but is not limited to: RAM (Random-Access Memory, random access memory) And ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory) Memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cartridges, magnetic tapes, disks Storage or other magnetic storage devices. in:

The transceiver 116 is configured to send first information to a network device in the second system when it is detected that the first system is unavailable; wherein, the first information is used to send first information to the network device in the second system The network device informs that the first system is unavailable.

Optionally, the transceiver 116 is further configured to send update information to a network device in the second system when it is detected that the first system is available; wherein, the update information is used to send update information to the network device in the second system. The network device in the second system informs that the first system is available.

Please refer to FIG. 12, which shows a schematic structural diagram of a network device 120 provided by an embodiment of the present application. For example, the network device may be a network device in the second system described above for executing The method of receiving information on the network device side. Specifically, the network device 120 may include: a processor 121, a receiver 122, a transmitter 123, a memory 124, and a bus 125.

The processor 121 includes one or more processing cores, and the processor 121 executes various functional applications and information processing by running software programs and modules.

The receiver 122 and the transmitter 123 may be implemented as a transceiver 126, and the transceiver 126 may be a communication chip.

The memory 124 is connected to the processor 121 through the bus 125.

The memory 124 may be used to store a computer program, and the processor 121 is used to execute the computer program to implement each step executed by the network device in the second system in the foregoing method embodiment.

In addition, the memory 124 may be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile or non-volatile storage device includes but is not limited to: RAM (Random-Access Memory, random access memory) And ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory) Memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cartridges, magnetic tapes, disks Storage or other magnetic storage devices. in:

The transceiver 126 is configured to receive first information sent by a terminal device, the first information being sent by the terminal device when it detects that the first system is unavailable; wherein, the first information is used for Notifying the network device that the first system is unavailable.

Optionally, the transceiver 126 is further configured to receive update information sent by the terminal device, where the update information is sent by the terminal device upon detecting that the first system is available; where The update information is used to inform network devices in the second system that the first system is available.

An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is used to be executed by a processor of a terminal device to implement the above-mentioned information sending method.

The embodiment of the present application also provides a computer-readable storage medium in which a computer program is stored, and the computer program is used to be executed by a processor of a network device in a second system to implement the above-mentioned information receiving method .

An embodiment of the present application also provides a chip. The chip includes a programmable logic circuit and/or program instructions. When the chip runs on a terminal device, it is used to implement the above-mentioned information sending method.

An embodiment of the present application also provides a chip, which includes a programmable logic circuit and/or program instructions, and when the chip runs on a network device in a second system, it is used to implement the above-mentioned information receiving method.

This application also provides a computer program product, which when the computer program product runs on the terminal device side computer, causes the computer to execute the above-mentioned terminal device side information sending method.

This application also provides a computer program product, when the computer program product runs on the computer on the network device side in the second system, it causes the computer to execute the method for receiving information on the network device side in the second system.

Those skilled in the art should be aware that, in one or more of the foregoing examples, the functions described in the embodiments of the present application may be implemented by hardware, software, firmware, or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium. The computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

The above are only exemplary embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims

An information sending method, characterized in that it is applied to a terminal device, and the method includes:

In the case of detecting that the first system is unavailable, sending the first information to the network device in the second system;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.
The method according to claim 1, wherein the first information does not include capability information of the first system and/or network behavior information expected by the terminal device in the first system.
The method of claim 2, wherein:

In the case that the first system is an evolved packet system EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode;

or,

In the case that the first system is the fifth generation mobile communication system 5GS, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.
The method according to claim 2 or 3, wherein:

In the case that the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS supports or does not support control plane optimization, and EPS supports or does not support user plane Optimization, control plane optimization in EPS is the first choice or user plane optimization is the first choice, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression;

or,

In the case that the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane Optimization. In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.
The method according to any one of claims 1 to 4, wherein the first information includes indication information used to indicate that the first system is unavailable.
The method according to claim 5, wherein the indication information comprises:

The first indication information is used to indicate that the terminal device does not have the ability to access the first system;

and / or,

The second indication information is used to indicate that the terminal device does not expect the network behavior of the first system.
The method according to claim 5 or 6, wherein the first information further includes: network behavior information expected by the terminal device in the first system, and/or, the terminal device is in Network behavior information expected in the second system.
The method according to any one of claims 1 to 7, wherein the unavailability of the first system includes at least one of the following situations:

The terminal device does not detect a cell that supports the first system;

The terminal device does not camp on a cell that supports the first system;

The terminal device cannot successfully register in the first system;

The terminal device cannot successfully initiate a service in the first system;

The cell where the terminal device resides in the first system does not support the desired service.
The method according to any one of claims 1 to 8, wherein the first information is a registration request message, and the registration request message is used to request registration in the second system.
The method according to any one of claims 1 to 9, wherein the first information is that the terminal device is being redirected from the second system to the first system, and the Sent when the first system is unavailable.
The method according to any one of claims 1 to 10, wherein after the sending the first information to the network device in the second system, the method further comprises:

In the case of detecting that the first system is available, sending update information to the network device in the second system;

Wherein, the update information is used to inform network devices in the second system that the first system is available.
The method according to claim 11, wherein the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and To indicate the information available for the first system.
An information receiving method, characterized in that it is applied to a network device in a second system, and the method includes:

Receiving first information sent by a terminal device, where the first information is sent when the terminal device detects that the first system is unavailable;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.
The method according to claim 13, wherein the first information does not include capability information of the first system and/or network behavior information expected by the terminal device in the first system.
The method of claim 14, wherein:

In the case that the first system is an evolved packet system EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode;

or,

In the case that the first system is the fifth generation mobile communication system 5GS, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.
The method according to claim 14 or 15, characterized in that:

In the case that the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS supports or does not support control plane optimization, and EPS supports or does not support user plane Optimization, control plane optimization is the first choice in EPS or user plane optimization is the first choice, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression;

or,

In the case that the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane Optimization. In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.
The method according to any one of claims 13 to 16, wherein the first information includes indication information used to indicate that the first system is unavailable.
The method according to claim 17, wherein the indication information comprises:

The first indication information is used to indicate that the terminal device does not have the ability to access the first system;

and / or,

The second indication information is used to indicate that the terminal device does not expect the network behavior of the first system.
The method according to claim 17 or 18, wherein the first information further includes: network behavior information expected by the terminal device in the first system, and/or, the terminal device is in Network behavior information expected in the second system.
The method according to any one of claims 13 to 19, wherein the unavailability of the first system includes at least one of the following situations:

The terminal device does not detect a cell that supports the first system;

The terminal device does not camp on a cell that supports the first system;

The terminal device cannot successfully register in the first system;

The terminal device cannot successfully initiate a service in the first system;

The cell where the terminal device resides in the first system does not support the desired service.
The method according to any one of claims 13 to 20, wherein the first information is a registration request message, and the registration request message is used to request registration in the second system.
The method according to any one of claims 13 to 21, wherein the first information is that the terminal device is being redirected from the second system to the first system, and the Sent when the first system is unavailable.
The method according to any one of claims 13 to 22, wherein after the receiving the first information sent by the terminal device, the method further comprises:

Receiving update information sent by the terminal device, where the update information is sent by the terminal device upon detecting that the first system is available;

Wherein, the update information is used to inform network devices in the second system that the first system is available.
The method according to claim 23, wherein the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and To indicate the information available for the first system.
An information sending device, characterized in that it is applied to terminal equipment, and the device includes:

The first information sending module is configured to send the first information to the network device in the second system when it is detected that the first system is unavailable;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.
The apparatus according to claim 25, wherein the first information does not include capability information of the first system and/or network behavior information expected by the terminal device in the first system.
The device of claim 26, wherein:

In the case that the first system is an evolved packet system EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode;

or,

In the case that the first system is the fifth generation mobile communication system 5GS, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.
The device according to claim 26 or 27, wherein:

In the case that the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS supports or does not support control plane optimization, and EPS supports or does not support user plane Optimization, control plane optimization is the first choice in EPS or user plane optimization is the first choice, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression;

or,

In the case that the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane Optimization. In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.
The device according to any one of claims 25 to 28, wherein the first information includes indication information used to indicate that the first system is unavailable.
The device according to claim 29, wherein the indication information comprises:

The first indication information is used to indicate that the terminal device does not have the ability to access the first system;

and / or,

The second indication information is used to indicate that the terminal device does not expect the network behavior of the first system.
The apparatus according to claim 29 or 30, wherein the first information further includes: network behavior information expected by the terminal device in the first system, and/or, the terminal device is in Network behavior information expected in the second system.
The device according to any one of claims 25 to 31, wherein the unavailability of the first system includes at least one of the following situations:

The terminal device does not detect a cell that supports the first system;

The terminal device does not camp on a cell that supports the first system;

The terminal device cannot successfully register in the first system;

The terminal device cannot successfully initiate a service in the first system;

The cell where the terminal device resides in the first system does not support the desired service.
The device according to any one of claims 25 to 32, wherein the first information is a registration request message, and the registration request message is used to request registration in the second system.
The apparatus according to any one of claims 25 to 33, wherein the first information is that the terminal device is being redirected from the second system to the first system and detects that the Sent when the first system is unavailable.
The device according to any one of claims 25 to 34, wherein the device further comprises:

An update information sending module, configured to send update information to a network device in the second system when it is detected that the first system is available;

Wherein, the update information is used to inform network devices in the second system that the first system is available.
The device according to claim 35, wherein the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and To indicate the information available for the first system.
An information receiving device, characterized in that it is applied to a network device in a second system, and the device includes:

The first information receiving module is configured to receive first information sent by a terminal device, where the first information is sent when the terminal device detects that the first system is unavailable;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.
The apparatus according to claim 37, wherein the first information does not include capability information of the first system and/or network behavior information expected by the terminal device in the first system.
The device of claim 38, wherein:

In the case that the first system is an evolved packet system EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode;

or,

In the case that the first system is the fifth generation mobile communication system 5GS, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.
The device according to claim 38 or 39, wherein:

In the case that the first system is EPS, the network behavior information expected by the terminal device in the first system includes at least one of the following: EPS supports or does not support control plane optimization, and EPS supports or does not support user plane Optimization, control plane optimization is the first choice in EPS or user plane optimization is the first choice, EPS supports or does not support non-3GPP protocol data transmission, EPS supports or does not support control plane optimization header compression;

or,

In the case that the first system is 5GS, the network behavior information expected by the terminal device in the first system includes at least one of the following: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane Optimization. In 5GS, control plane optimization is the first choice or user plane optimization is the first choice, 5GS supports or does not support non-3GPP protocol data transmission, 5GS supports or does not support control plane optimization header compression.
The apparatus according to any one of claims 37 to 40, wherein the first information includes indication information used to indicate that the first system is unavailable.
The device according to claim 41, wherein the indication information comprises:

The first indication information is used to indicate that the terminal device does not have the ability to access the first system;

and / or,

The second indication information is used to indicate that the terminal device does not expect the network behavior of the first system.
The apparatus according to claim 41 or 42, wherein the first information further includes: network behavior information expected by the terminal device in the first system, and/or, the terminal device is in Network behavior information expected in the second system.
The device according to any one of claims 37 to 43, wherein the first system is unavailable, including at least one of the following situations:

The terminal device does not detect a cell that supports the first system;

The terminal device does not camp on a cell that supports the first system;

The terminal device cannot successfully register in the first system;

The terminal device cannot successfully initiate a service in the first system;

The cell where the terminal device resides in the first system does not support the desired service.
The apparatus according to any one of claims 37 to 44, wherein the first information is a registration request message, and the registration request message is used to request registration in the second system.
The apparatus according to any one of claims 37 to 45, wherein the first information is that the terminal device is being redirected from the second system to the first system and detects that the Sent when the first system is unavailable.
The device according to any one of claims 37 to 46, wherein the device further comprises:

An update information receiving module, configured to receive update information sent by the terminal device, where the update information is sent by the terminal device when it detects that the first system is available;

Wherein, the update information is used to inform network devices in the second system that the first system is available.
The apparatus according to claim 47, wherein the update information includes at least one of the following: capability information of the first system, network behavior information expected by the terminal device in the first system, and To indicate the information available for the first system.
A terminal device, characterized in that the terminal device includes a processor and a transceiver connected to the processor; wherein:

The transceiver is configured to send first information to a network device in the second system when it is detected that the first system is unavailable;

Wherein, the first information is used to inform network devices in the second system that the first system is unavailable.
A network device, wherein the network device is in a second system, and the network device includes a processor and a transceiver connected to the processor; wherein:

The transceiver is configured to receive first information sent by a terminal device, where the first information is sent by the terminal device when it detects that the first system is unavailable;

Wherein, the first information is used to inform the network device that the first system is unavailable.
A computer-readable storage medium, characterized in that a computer program is stored in the storage medium, and the computer program is used to be executed by a processor of a terminal device to implement the method according to any one of claims 1 to 12 Information delivery method.
A computer-readable storage medium, characterized in that a computer program is stored in the storage medium, and the computer program is used to be executed by a processor of a network device in a second system to implement any of claims 13 to 24. The information receiving method described in one item.