CN114747254A

CN114747254A - Information sending method, receiving method, device, equipment and storage medium

Info

Publication number: CN114747254A
Application number: CN202080082807.8A
Authority: CN
Inventors: 刘建华; 杨皓睿
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2022-07-12
Also published as: WO2021163855A1

Abstract

The application discloses an information sending method, an information receiving method, an information sending device, an information receiving device, information receiving equipment and a storage medium, and relates to the technical field of communication. The method comprises the following steps: the method comprises the steps that when a terminal device detects that a first system is unavailable, first information is sent to network equipment in a second system; wherein the first information is used to inform the network device in the second system that the first system is unavailable. The embodiment of the application can prevent the network equipment in the system where the terminal equipment is located from redirecting the terminal equipment to other systems after receiving the registration request of the terminal equipment, so that the terminal equipment can acquire the network service in time. In addition, according to the embodiment of the application, the terminal device can be prevented from being redirected to other systems again when the network device in the current system processes the registration request of the terminal device, the terminal device is prevented from being switched back and forth between the current system and other systems, the time delay of the terminal device for acquiring the network service is reduced, and the efficiency of the terminal device for accessing the communication system is improved.

Description

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

Technical Field

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

Background

CIoT (Cellular Internet of Things) is an Internet of Things that enables a CIoT terminal to access a mobile Communication network through NB-IoT (Narrowband Internet of Things) access technology or eMTC (Enhanced Machine Communication) access technology.

A typical CIoT System is EPS (Evolved Packet System). To accommodate higher speed traffic demands, 3GPP (3rd Generation Partnership Project) defines 5GS (5th Generation System, fifth Generation mobile communication System). The CIoT terminal equipment supporting the 5GS system and the EPS system can be accessed to the 5GS system and can also be accessed to the EPS system. However, when the CIoT terminal device accesses the 5GS system, the 5GS system may redirect the CIoT terminal device to the EPS system according to an operator policy or a load balancing requirement; or, when the CIoT terminal device accesses the EPS system, the EPS system may redirect the CIoT terminal device to the 5GS system according to an operator policy or a load balancing requirement.

Currently, the problem of redirection of terminal devices needs to be discussed further.

Disclosure of Invention

The embodiment of the application provides an information sending method, an information receiving method, a device, equipment and a storage medium. The technical scheme is as follows:

in one aspect, 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 first information to a network device in a second system;

wherein the first information is used to inform a network device 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, wherein the first information is sent by the terminal device under the condition that a first system is detected to be unavailable;

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

the first information sending module is used for sending first information to network equipment in a second system under the condition that the first system is detected to be unavailable;

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

the first information receiving module is used for receiving first information sent by terminal equipment, wherein the first information is sent by the terminal equipment under the condition that a first system is detected to be unavailable;

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

the transceiver is used for sending first information to the network equipment in the second system under the condition that the first system is detected to be unavailable;

In a further aspect, an embodiment of the present application provides a network device, where 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 used for receiving first information sent by a terminal device, wherein the first information is sent by the terminal device under the condition that a first system is detected to be unavailable;

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

In a further aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a terminal device to implement the above information sending method.

In a further aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a network device in a second system, so as to implement the above information receiving method.

In a further aspect, an embodiment of the present application provides a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a terminal device, the chip is configured to implement the information sending method.

In a further aspect, an embodiment of the present application provides a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a network device in a second system, the chip is configured to implement the information receiving method as described above.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

the terminal equipment sends information for indicating that other systems are unavailable to the network equipment in the system where the terminal equipment is located under the condition that the terminal equipment detects that other systems except the system where the terminal equipment is located are unavailable, so that the terminal equipment is prevented from being redirected to other systems after the network equipment in the system where the terminal equipment is located receives a registration request of the terminal equipment, and the terminal equipment can acquire network services in time. In addition, in the embodiment of the application, if the terminal device detects that the other system is unavailable after the network device in the current system redirects the terminal device to the other system, the terminal device sends the information indicating that the other system is unavailable to the network device in the current system, so that the terminal device can be prevented from being redirected to the other system again when the network device in the current system processes the registration request of the terminal device, the terminal device is prevented from being switched back and forth between the current system and the other system, the time delay of acquiring the network service by the terminal device is reduced, and the efficiency of accessing the terminal device to the communication system is improved.

Drawings

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

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

fig. 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 according to an embodiment of the present application;

fig. 6 is a flowchart of an information transmitting and receiving method according to another embodiment of the present application;

fig. 7 is a block diagram of an information transmitting apparatus according to an embodiment of the present application;

fig. 8 is a block diagram of an information transmitting apparatus according to another embodiment of the present application;

fig. 9 is a block diagram of an information receiving apparatus provided in an embodiment of the present application;

fig. 10 is a block diagram of an information receiving apparatus according to another embodiment of the present application;

fig. 11 is a block diagram of a terminal device according to an embodiment of the present application;

fig. 12 is a block diagram of a network device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

The technical scheme provided by the embodiment of the application can be applied to various communication systems, such as: a GSM (Global System for Mobile communications) System, a CDMA (Code Division Multiple Access) System, an ECDMA (Wideband Code Division Multiple Access) System, a GPRS (General Packet Radio Service), an LTE (Long Term Evolution ) System, an FDD (Radio Division Duplex, LTE Duplex) System, a TDD (Time Division Duplex, LTE Time Division Duplex) System, an UMTS (Universal Mobile telecommunications System ), a WiMAX (world Interoperability for Microwave Access), a Global interconnect Microwave Access (Worldwide Interoperability for Microwave Access) Communication System, a 5GS or New Radio, NR, and the like.

Referring to fig. 1, a schematic diagram of a system architecture provided in an embodiment of the present application is shown. 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.

Terminal equipment 10 may refer to a UE, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user device. Alternatively, the terminal device may also be a cellular phone, a cordless phone, an SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with a Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in 5GS (public Land Mobile Network, Pub1ic Land Mobile Network), or a terminal device in PLMN for future evolution, and the like, which is not limited in this embodiment of the present application. Optionally, the terminal device in this embodiment may be a CIoT terminal. The CIoT terminal has the application characteristics of low cost, simple function, low power consumption and infrequent user data transmission.

An access network device is a device deployed in an access network to provide wireless communication functions for terminal device 10. Access network devices may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with access network device functions may be different, for example, in a 5GS system, called nodeb or gNB; in EPS systems, it is referred to as eNodeB. As communication technology evolves, the name "access network equipment" may change. For convenience of description, in the embodiment of the present application, the above-mentioned apparatuses providing the terminal device 10 with the wireless communication function are collectively referred to as an access network device.

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

In this embodiment, the access network device includes a first access network device 20 and a second access network device 40, and the core network device includes a first core network device 30 and a second core network device 50, where the first access network device 20 and the first core network device 30 are network devices of a first system, and the second access network device 40 and the second core network device 50 are network devices of a second system. The first system and the second system are different systems, alternatively the first system may be a 5GS and the second system may be an EPS; alternatively, the first system may be EPS and the second system may be 5 GS. It should be understood that the first system and the second system may be other systems, and the embodiments of the present application do not limit this. In a scenario where the first system is an EPS and the second system is a 5GS, the first Access Network device 20 may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) or one or more enodebs in the EUTRAN, the first core Network device 30 may be an MME, the second Access Network device 40 may be a RAN (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 the present application is a corresponding network device in these systems.

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

1. and (3) EUTRAN: a network consisting of a plurality of enodebs (Evo1ved nodebs, evolved base stations) implements wireless physical layer functions, resource scheduling and wireless resource management, radio access control, and mobility management functions. The enodebs may be connected via an X2 interface and may be used to transmit data during an X2-based handover. The eNodeB is connected to an SGW (Serving Gateway) through a User Plane interface SI-U, and uses a GTP-U (General Packet Radio System General Tunneling Protocol User Plane) to transmit User data: the Mobile Management Entity (MME) is connected with a control plane interface (SI-E), and functions such as wireless access bearing control and the like are realized by adopting an SI-AP protocol.

2. MME: all control plane functions mainly responsible for user, i.e., session management, include NAS (Non-Access-Stratum) signaling and security, Tracking Area List management (Tracking Area List) management, P-GW (Packet data Network Gateway) and SGW selection, etc.

3. SGW: the local mobility anchor point is mainly responsible for data transmission, forwarding, route switching and the like of the user equipment, and is used as the local mobility anchor point when the user equipment is switched between eNodeBs (each user is provided with only one SGW serving each time).

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

5. SGSN (Serving GPR Supporting Node, Serving GPRs support Node): the Access node is an Access node of a 2G Access Network GERAN (GSM/EDGE Radio Access Network ), a 3G Access Network UTRAN (Universal Terrestrial Radio Access Network) and an EPS core Network EPC, and is responsible for establishing a load from the GERAN, the UTRAN and the EPC and forwarding data.

6. HSS (Home Subscriber Server): and storing the subscription data of the mobile user.

7. PCRF (Policy and Charging Rules Function): and is responsible for Charging management and Policy Control, including PCC (Policy and Charging Control) rules and QoS (Quality of Service) rules.

Fig. 3 shows a schematic diagram of a system architecture of the 5GS system provided by the embodiment of the present application. As shown in fig. 3, the system architecture 200 may include: UE, RAN, Core (Core network) and DN. The UE, RAN, and Core are the main components constituting the architecture, and logically they can be divided into two parts, namely a user plane and a control plane, where the control plane is responsible for the management of the 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 Core control plane, the NG3 reference point is located between the RAN user plane and the Core user plane, and the NG6 reference point is located between the Core user plane and the data network.

The UE: the method is an entrance for interaction between a mobile user and a network, can provide basic computing capacity and storage capacity, displays a business window for the user, and accepts operation input of the user. The UE establishes signal connection and data connection with the RAN using a next generation air interface technology, thereby transmitting a control signal and service data to the mobile network.

RAN: similar to a base station in a traditional network, the base station is deployed at a position close to the UE, provides a network access function for authorized users in a specific area, and can transmit user data by using transmission tunnels with different qualities according to the level of the users, the service requirements and the like. RAN can manage its own resources, make reasonable use of the resources, provide access services for UE as required, and forward control signals and user data between UE and a core network.

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

DN: the data network is a data network providing service for users, and generally, a client is located in a UE, and a server is located in the data network. The data Network may be a private Network, such as a local area Network, an external Network that is not controlled by an operator, such as the Internet, or a private Network that is co-deployed by an operator, such as in order to configure an IMS (IP Multimedia Network Subsystem) service.

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

UPF: executing user data packet forwarding according to the routing rule of the SMF;

AUSF: performing security authentication of the UE;

AMF: UE access management and mobility management;

SMF: UE session management;

NSSF: selecting a network slice for the UE;

NEF: opening a network function to a third party in a northbound API interface mode;

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

UDM: user subscription context management;

PCF: managing user strategies;

AF: and managing the user application.

In the architecture shown in fig. 4, the N1 interface is the reference point between the UE and the AMF; the N2 interface is a reference point of RAN and AMF, and is used for sending NAS messages and the like; the N3 interface is a reference point between RAN and UPF, used for transmitting user plane data, etc.; the N4 interface is a reference point between the SMF and the UPF, and is used to transmit information such as tunnel identification information, data cache indication information, and downlink data notification message connected to N3; the N6 interface is a reference point between the UPF and DN for transmitting user plane data, etc.

It should be noted that the name of the interface between each network element in fig. 3 and fig. 4 is only an example, and the name of the interface in the specific implementation may be other names, which is not specifically limited in this embodiment of the present application. The names of the respective network elements (such as SMF, AF, UPF, etc.) included in fig. 3 and 4 are also only examples, and the functions of the network elements themselves are not limited. In 5GS and other future networks, the network elements may also be named otherwise, and this is not specifically limited in this embodiment of the present application. For example, in a 6G network, some or all of the above network elements may use the terminology in 5G, and may also use other names, and so on, which are described herein in a unified manner and will not be described again below. Furthermore, it should be understood that the name of the transmitted message (or signaling) between the network elements is only an example, and the function of the message itself is not limited in any way.

In one example, the system architecture shown in fig. 1 described above may be used to perform a redirection method for a terminal device. Illustratively, the first core network device 30 in the first system determines to redirect the terminal device 10 to the second system according to the capability information of the second system and the network behavior information expected in the second system, which are carried in the registration request when the terminal device 10 is registered in the first system. The first core network device 30 may instruct the first access network device 20 to trigger the handover procedure through the redirection indication information. Then, the first access network device 20 may trigger an intersystem handover by sending a handover required message to the second core network device 50 to handover the terminal device from the first system to the second system, so that the redirection problem between two different systems can be solved. However, if the terminal device initiates a registration request to the first system again after redirection when the terminal device cannot find a cell supporting connection in the second system, at this time, the first system may redirect the terminal device to the second system again according to the registration request of the terminal device, which may result in an excessively long time delay for the terminal device to access the network, that is, the terminal device cannot obtain network service for a long period of time.

Based on this, the embodiment of the present application provides an information sending and receiving method, where when detecting that a system other than the current system is unavailable, a terminal device sends information indicating that the system is unavailable to a network device in the current system, so as to prevent the network device in the system where the terminal device is currently located from redirecting the terminal device to the other system after receiving a registration request of the terminal device, so that the terminal device can obtain a network service in time. In addition, in the embodiment of the application, if the terminal device detects that the other system is unavailable after the network device in the current system redirects the terminal device to the other system, the terminal device sends the information indicating that the other system is unavailable to the network device in the current system, so that the terminal device can be prevented from being redirected to the other system again when the network device in the current system processes the registration request of the terminal device, the terminal device is prevented from being switched back and forth between the current system and the other system, the time delay of acquiring the network service by the terminal device is reduced, and the efficiency of accessing the terminal device to the communication system is improved.

The technical solution of the present application will be described below with reference to several exemplary embodiments.

Referring to fig. 5, a flowchart of an information sending and receiving method provided in an embodiment of the present application is shown, where the method is applicable to the system architectures shown in fig. 1 to fig. 4, and the method may include the following steps:

step 510, the terminal device sends first information to a network device in a second system when detecting that the first system is unavailable.

When accessing a communication system, the terminal device may first detect the system accessibility of the communication system, that is, the terminal device may first detect whether the communication system is accessible, and may access the communication system if the communication system is accessible, and may not access the communication system if the communication system is not accessible. In this embodiment, the terminal device may detect system reachability of the first system, and send the first information to the network device in the second system when detecting that the first system is unreachable, that is, when the first system is unavailable. Optionally, the first system is not available, including at least one of: the terminal device does not detect a cell supporting the first system, for example, the system information of the cell detected by the terminal device indicates that the first system cannot be connected, and the like; the terminal device does not camp on the cell supporting the first system, for example, the channel quality of the cell supporting the first system is not enough to cause the terminal device to camp on, or the cell supporting the first system is prohibited from registering, etc.; the terminal device cannot be successfully registered in the first system, for example, the first system rejects a registration request of the terminal device, or the terminal device has no subscription information, and the like; the terminal equipment can not successfully initiate the service in the first system, for example, the first system does not have the service capability and the like; the cell in which the terminal device resides in the first system does not support the desired service, for example, the first system does not support the CIoT service desired by the terminal device.

The network device in the second system may be a core network device in the second system, and optionally, the network device in the second system may be a core network device in the second system, which is responsible for access management and mobility management of the terminal device, that is, the network device in the second system may be a mobility management network element in the second system. When the second system is implemented as a 5GS system, the network device in the second system may be implemented as an AMF, and when the second system is implemented as an EPS system, the network device 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 device in the second system is implemented as a core network device having the function of the mobility management network element in the other communication systems accordingly. In the embodiment of the application, when detecting that the first system is unavailable, the terminal device may send first information to the network device in the second system, where the first information is used to notify the network device in the second system that the first system is unavailable, that is, after receiving the first information, the network device in the second system may determine, according to the first information, that the first system is unavailable to provide network services for the terminal device. Optionally, the first information is a registration request message, or the first information may be carried in the registration request message, where 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 the first system is detected to be unavailable, that is, the terminal device initiates a registration request to the second system twice, when the registration request is initiated to the 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, then the terminal device initiates a registration request to the network device in the second system for the second time when the first system is detected to be unavailable, the registration request message sent to the network device in the second system when the terminal device initiates a registration request for the second time may 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 the registration request to the network device in the second system for the first time, the terminal device may carry the first information in a registration request message sent when initiating the registration request to the network device in the second system for the first time, or the registration request message is the first information.

In one example, 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. 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 service for the terminal equipment; when the first information received by the second system does not include the network behavior information expected by the terminal device in the first system, the second system may confirm that the terminal device does not desire to access the first system, and further, the second system may confirm that the first system is unavailable according to the first information, so that the terminal device is not redirected to the first system.

Exemplarily, in the case that the first system is an EPS, the capability information of the first system is used to indicate whether the terminal device supports the S1 mode; alternatively, in the case where the first system is the 5GS system, the capability information of the first system is used to indicate whether the terminal device supports the N1 mode.

Exemplarily, in the case that 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 supports or does not support control plane optimization, EPS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3 GPP protocol data transmission, EPS supports or does not support control plane optimization; or, in the case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.

In another example, the first information includes indication information indicating 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: the first indication information is used for indicating that the terminal equipment does not have the capacity of accessing the first system; and/or second indication information for indicating that the terminal device does not expect the network behavior of the first system. The reason why the terminal device does not have the capability of accessing the first system may be that the first system does not support a service expected by the terminal device, or the terminal device does not have subscription information, or the terminal device cannot reside in a cell supporting the first system. Optionally, in order to improve the processing of the indication information by the network device in the second system, and respond to the indication information of the terminal device in time, the first indication information may only explicitly indicate that the terminal device does not have the capability of accessing the first system, and does not need to include a reason that the terminal device does not have the capability of accessing the first system, so as to avoid that the network device in the second system further needs to confirm that the terminal device does not have the capability of accessing the first system according to the reason. Optionally, in order to promote the processing of the indication information by the network device in the second system, and respond to the indication information of the terminal device in time, the second indication information may also only explicitly indicate that the terminal device does not expect the network behavior of the first system.

Although the terminal device may not expect the network behavior of the first system in the current scenario or the current terminal device may not have the capability of accessing the first system, the terminal device may expect the network behavior of the first system in a future scenario or the terminal device may have the capability of accessing the first system. If the network device in the second system to which the terminal device is connected does not clearly know the network device information expected by the terminal device in the first system, after the terminal device expects the network behavior of the first system or the terminal device has the capability of connecting to the first system, the terminal device needs to send the indication 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, an embodiment of the present application provides a method, which can avoid that the terminal device sends the indication information to the network device in the second system for multiple times, and avoid redundant signaling overhead, that is, 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. That is, when initiating the registration request to the network device in the second system, the terminal device may carry indication information for indicating that the first system is unavailable in the first information, and at the same time carry network behavior information expected by the terminal device in the first system, and/or carry network behavior information expected by the terminal device in the second system, and after receiving the first information, the network device in the second system may store the content in the first information, so as to avoid that, when the second system is available subsequently, the terminal device needs to send the network behavior expected by the terminal device in the first system to the network device in the second system again.

In a possible implementation manner, after the sending the first information to the network device in the second system, the method further includes: the method comprises the steps that when a terminal device detects that a first system is available, update information is sent to network devices in a second system; wherein the update information is used to inform the network device 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 accesses the second system and receives the network service. In this embodiment of the application, when the terminal device accesses the second system, the terminal device may further continue to detect the first system to determine whether the first system is available, and when the terminal device detects that the first system is available, the terminal device may send update information to the network device in the second system, where the update information is used to notify the network device in the second system that the first system is available, and after receiving the update information, the network device in the second system may redirect the terminal device to the first system according to the update information. Optionally, the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, information indicating availability of the first system.

In summary, according to the technical scheme provided in the embodiment of the present application, when detecting that a system other than the system where the terminal device is currently located is unavailable, the terminal device sends information indicating that the system is unavailable to the network device in the system where the terminal device is currently located, so that the terminal device is prevented from being redirected to the other system after receiving a registration request of the terminal device by the network device in the system where the terminal device is currently located, and the terminal device can obtain network services in time. In addition, in the embodiment of the application, if the terminal device detects that the other system is unavailable after the network device in the current system redirects the terminal device to the other system, the terminal device sends the information indicating that the other system is unavailable to the network device in the current system, so that the terminal device can be prevented from being redirected to the other system again when the network device in the current system processes the registration request of the terminal device, the terminal device is prevented from being switched back and forth between the current system and the other system, the time delay of acquiring the network service by the terminal device is reduced, and the efficiency of accessing the terminal device to the communication system is improved.

In addition, the embodiment of the present application provides two kinds of contents included in information for indicating that another system is unavailable, one is that the information does not include capability information of the other system or network behavior of the other system that is expected by the terminal device, so that after the network device in the current system receives the information sent by the terminal device, it can be determined that the other system is unavailable according to the information, or the terminal device does not desire to access the other system, so as to further determine that the terminal device is not redirected to the other system; the other is that the information includes indication information indicating that the other system is unavailable, so that after receiving the information sent by the terminal device, the network device in the current system can directly determine not to redirect the terminal device to the other system, which is convenient for the network device in the current system to determine whether to redirect the terminal device to the other system.

In addition, in the technical solution provided in this embodiment, if the terminal device is connected to the current system and detects that another system is available, the update information may be sent to the network device in the current system to notify that the other system is available to the network device in the current system, so that the network device in the current system may determine whether to redirect the terminal device to another system according to the update information to meet the load balancing requirement.

The technical solution of the present application is described below with reference to a specific example. Referring to fig. 6, it is assumed that the first system is an EPS system and the second system is a 5GS system, and at this time, the network device in the second system may be implemented as an AMF. The information sending and receiving method comprises the following steps:

step 610, the terminal equipment sends a registration request message to the AMF; when initiating a registration request to the AMF, the terminal device may send a registration request message to the AMF, where the registration request message includes at least one of the following: capability information of the EPS system, capability information of the 5GS system, network behavior information expected by the terminal equipment in the EPS system, and network behavior information expected by the terminal equipment in the 5GS system;

step 620, the AMF redirects the terminal equipment to the EPS system; after receiving a registration request message of a terminal device, the AMF can redirect the terminal device from the AMF system to the EPS system according to load balancing requirements, operator strategies and the like, at the moment, the AMF can instruct an access network device in the 5GS system to trigger a switching process through redirection indicating information, and then the access network device in the 5GS system sends a switching requirement message to an MME to trigger an intersystem switching process;

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 detect the EPS system first to determine whether the EPS system is available, and optionally, the terminal device may detect whether there is a cell supporting the EPS system, detect whether the cell supporting the EPS system can reside, detect whether the EPS system can successfully initiate a service, detect whether the cell that can reside in the EPS system supports an expected service, and the like;

step 640, the terminal device sends first information to the AMF when detecting that the EPS system is unavailable; when the terminal equipment encounters any of the following conditions in the detection process, the EPS system can be considered to be unavailable: the method comprises the steps of detecting that a cell supporting an EPS system is not detected, the cell can not reside in the cell supporting the EPS system, the cell can not successfully initiate service in the EPS system, and the cell residing in the EPS system can not support expected service. The method comprises the steps that when detecting that an EPS system is unavailable, a terminal device sends first information to an AMF, wherein the first information is used for informing that the EPS system redirected by the AMF is unavailable;

step 650, the AMF determines whether to redirect the terminal device to the EPS system according to the first information; after receiving the first information of the terminal device, the AMF may determine whether to redirect the terminal device to the EPS system according to the first information and by combining a load balancing policy, etc.;

step 660, the AMF sends a registration response message to the terminal device under the condition that the terminal device is determined not to be redirected to the EPS system; under the condition that the EPS system is unavailable, in order to provide network service for the terminal equipment in time, the AMF can send a registration response message to the terminal equipment and also determine to access the terminal equipment to the 5GS system to acquire the network service;

step 670, the terminal equipment detects the EPS system; after the terminal equipment is accessed to the 5GS system and acquires the network service, the first system can be continuously detected so as to be convenient for switching the EPS system at any time in the subsequent process;

step 680, the terminal device sends update information to the AMF when detecting that the first system is available; the terminal device may send update information to the AMF, in case it detects that the first system is available, where the update information may include at least one of the following: the method comprises the steps of obtaining capability information of an EPS system, network behavior information expected by terminal equipment in the EPS system and information used for indicating the EPS system to be available;

690, the AMF determines whether to redirect the terminal device to the EPS system according to the update information; after receiving the update information of the terminal device, the AMF may determine whether to redirect the terminal device to the EPS system according to the update information and by combining a load balancing policy and the like.

It should be noted that, in the above method embodiment, the technical solution of the present application is described mainly from the perspective of interaction between the terminal device and the network device in the second system. The steps executed by the terminal equipment can be independently realized to become the information sending method of the terminal equipment side; the above-described steps performed with respect to the network device in the second system may be implemented separately as an information receiving method on the network device side in the second system.

The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.

Referring to fig. 7, a block diagram of an information sending apparatus according to an embodiment of the present application is shown. The device has the function of realizing the method example of the terminal equipment side, and the function can be realized by hardware or by executing corresponding software by hardware. The apparatus may be the terminal device described above, or may be provided in the terminal device. As shown in fig. 7, the apparatus 700 may include: a first information sending module 710.

A first information sending module 710, configured to send first information to a network device in a second system if it is detected that the first system is unavailable; wherein the first information is used to inform a network device in the second system 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, in a 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 a 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.

Optionally, in a case that the first system is an EPS, the network behavior information expected by the terminal device in the first system includes at least one of: EPS supports or does not support control plane optimization, EPS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3 GPP protocol data transmission, EPS supports or does not support control plane optimization; or, in a case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.

Optionally, the first information includes indication information for indicating that the first system is unavailable.

Optionally, the indication information includes: first indication information, which is used for indicating that the terminal equipment does not have the capability of accessing the first system; and/or second indication information for indicating that the terminal device does not expect the network behavior of the first system.

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 first system is unavailable, including at least one of: the terminal device does not detect a cell supporting the first system; the terminal device does not camp on a cell supporting the first system; the terminal equipment cannot be successfully registered in the first system; the terminal equipment can not successfully initiate a service in the first system; the cell in which the terminal device resides in the first system does not support the desired service.

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 by the terminal device when the terminal device is redirected from the second system to the first system and the first system is detected to be unavailable.

Optionally, as shown in fig. 8, the apparatus 700 further includes: an update information sending module 720, 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.

Optionally, the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, information indicating availability of the first system.

In summary, according to the technical solution provided in the embodiment of the present application, when detecting that a system other than the system where the terminal device is located is unavailable, the terminal device sends information indicating that the system is unavailable to the network device in the system where the terminal device is located, so as to prevent the network device in the system where the terminal device is located from redirecting the terminal device to the other system after receiving the registration request of the terminal device, so that the terminal device can obtain the network service in time. In addition, in the embodiment of the application, if the terminal device detects that the other system is unavailable after the network device in the current system redirects the terminal device to the other system, the terminal device sends the information indicating that the other system is unavailable to the network device in the current system, so that the terminal device can be prevented from being redirected to the other system again when the network device in the current system processes the registration request of the terminal device, the terminal device is prevented from being switched back and forth between the current system and the other system, the time delay of acquiring network service by the terminal device is reduced, and the efficiency of accessing the terminal device to the communication system is improved.

Referring to fig. 9, a block diagram of an information receiving apparatus according to an embodiment of the present application is shown. The apparatus has a function of implementing the method example on the network device side in the second system, and the function may be implemented by hardware or by hardware executing corresponding software. The apparatus may be the network device in the second system described above, or may be provided in the network device in the second system. As shown in fig. 9, the apparatus 900 may include: a first information receiving module 910.

A first information receiving module 910, configured to receive first information sent by a terminal device, where the first information is sent by the terminal device when detecting that a first system is unavailable; wherein the first information is used to inform a network device in the second system that the first system is unavailable.

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

Optionally, the first system is not available, including at least one of: the terminal device does not detect a cell supporting the first system; the terminal device does not camp on a cell supporting the first system; the terminal equipment cannot be successfully registered in the first system; the terminal equipment can not successfully initiate a service in the first system; the cell in which the terminal device resides in the first system does not support the desired service.

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 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.

Optionally, the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.

It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of each functional module is illustrated, and in practical applications, the above functions may be distributed by different functional modules according to actual needs, that is, the content structure of the device may be divided into different functional modules to implement all or part of the functions described above.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Please refer to fig. 11, which illustrates a schematic structural diagram of a terminal device 110 according to an embodiment of the present application, for example, the terminal device may be the terminal device described above, and is configured to execute the information sending method on the terminal device side. Specifically, the method comprises the following steps: 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 executing 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 via a bus 115.

The memory 114 may be used for storing a computer program, which the processor 111 is used for executing in order to implement the various steps performed by the terminal device in the above-described method embodiments.

Further, the memory 114 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash Memory or other solid state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc) or other optical storage, magnetic tape cartridge, magnetic tape, magnetic disk storage or other magnetic storage devices. Wherein:

the transceiver 116, configured to send first information to a network device in a second system if the first system is detected to be unavailable; wherein the first information is used to inform a network device in the second system 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 if 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.

Please refer to fig. 12, which shows a schematic structural diagram of a network device 120 according to an embodiment of the present application, for example, the network device may be the network device in the second system described above, and is configured to execute the information receiving method on the network device side in the second system described above. Specifically, the method comprises the following steps: 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 executing 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 via a bus 125.

The memory 124 may be used for storing a computer program, which the processor 121 is used for executing to implement the respective steps performed by the network device in the second system in the above-described method embodiments.

Further, memory 124 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash Memory or other solid state Memory technologies, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc), or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. Wherein:

the transceiver 126 is configured to receive first information sent by a terminal device, where the first information is sent by the terminal device when detecting that a first system is unavailable; wherein the first information is used to inform 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 if 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.

Optionally, the update information includes at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a terminal device, so as to implement the above information sending method.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a network device in a second system, so as to implement the above information receiving method.

The embodiment of the application further provides a chip, which comprises a programmable logic circuit and/or a program instruction, and when the chip runs on the terminal device, the chip is used for realizing the information sending method.

The embodiment of the present application further provides a chip, where the chip includes a programmable logic circuit and/or a program instruction, and when the chip runs on a network device in a second system, the chip is configured to implement the information receiving method.

The application also provides a computer program product, which enables a computer to execute the information sending method of the terminal equipment side when the computer program product runs on the computer of the terminal equipment side.

The present application also provides a computer program product, which, when running on a computer on the network device side in the second system, causes the computer to execute the information receiving method on the network device side in the second system.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

An information sending method is applied to a terminal device, and the method comprises the following steps:

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

wherein the first information is used to inform a network device 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,

in the case that the first system is an Evolved Packet System (EPS), the capability information of the first system is used for indicating whether the terminal device supports an S1 mode;

or,

in the case where the first system is a 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,

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

or,

in the case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.
The method according to any one of claims 1 to 4, wherein the first information includes indication information for indicating that the first system is not available.
The method of claim 5, wherein the indication information comprises:

first indication information, which is used for indicating that the terminal equipment does not have the capability of accessing the first system;

and/or the presence of a gas in the gas,

second indication information for indicating 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 comprises: 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.
The method of any of claims 1 to 7, wherein the first system is unavailable, including at least one of:

the terminal device does not detect a cell supporting the first system;

the terminal device does not camp on a cell supporting the first system;

the terminal equipment cannot be successfully registered in the first system;

the terminal equipment can not successfully initiate a service in the first system;

the cell in which 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 for requesting registration in the second system.
The method according to any of claims 1 to 9, wherein the first information is sent by the terminal device if it is redirected from the second system to the first system and the first system is detected as being unavailable.
The method according to any one of claims 1 to 10, wherein after sending the first information to the network device in the second system, further comprising:

in the case that the first system is detected to be available, sending update information to the network equipment 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 of claim 11, wherein the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.
An information receiving method, applied to a network device in a second system, the method comprising:

receiving first information sent by a terminal device, wherein the first information is sent by the terminal device under the condition that a first system is detected to be unavailable;

wherein the first information is used to inform a network device 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,

in the case that the first system is an Evolved Packet System (EPS), the capability information of the first system is used for indicating whether the terminal device supports an S1 mode;

or,

in the case where the first system is a 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,

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

or,

in the case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.
The method according to any one of claims 13 to 16, wherein the first information includes indication information for indicating that the first system is not available.
The method of claim 17, wherein the indication information comprises:

first indication information, which is used for indicating that the terminal equipment does not have the capability of accessing the first system;

and/or the presence of a gas in the gas,

second indication information for indicating 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 comprises: 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.
The method of any of claims 13 to 19, wherein the first system is unavailable, including at least one of:

the terminal device does not detect a cell supporting the first system;

the terminal device does not camp on a cell supporting the first system;

the terminal equipment cannot be successfully registered in the first system;

the terminal equipment can not successfully initiate a service in the first system;

the cell in which the terminal device resides in the first system does not support the desired service.
The method according to any of claims 13 to 20, wherein the first information is a registration request message, the registration request message requesting registration in the second system.
The method according to any of claims 13 to 21, characterized in that the first information is sent by the terminal device if it is redirected from the second system to the first system and it is detected that the first system is not available.
The method according to any one of claims 13 to 22, wherein the receiving the first information sent by the terminal device further comprises:

receiving update information sent by the terminal equipment, wherein the update information is sent by the terminal equipment under the condition that the first system is detected to be available;

wherein the update information is used to inform network devices in the second system that the first system is available.
The method of claim 23, wherein the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.
An information transmission apparatus, applied to a terminal device, the apparatus comprising:

the first information sending module is used for sending first information to network equipment in a second system under the condition that the first system is detected to be unavailable;

wherein the first information is used to inform a network device 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 apparatus of claim 26,

in the case that the first system is an Evolved Packet System (EPS), the capability information of the first system is used for indicating whether the terminal device supports an S1 mode;

or,

in the case where the first system is a 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 apparatus of claim 26 or 27,

in the case that 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 EPS supports or does not support control plane optimization, the EPS supports or does not support user plane optimization, the control plane optimization is preferred or the user plane optimization is preferred in the EPS, the EPS supports or does not support non-3 GPP protocol data transmission, and the EPS supports or does not support header compression of the control plane optimization;

or,

in the case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.
The apparatus according to any one of claims 25 to 28, wherein the first information comprises indication information for indicating that the first system is not available.
The apparatus of claim 29, wherein the indication information comprises:

first indication information, which is used for indicating that the terminal equipment does not have the capability of accessing the first system;

and/or the presence of a gas in the gas,

second indication information for indicating 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 comprises: 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.
The apparatus of any one of claims 25 to 31, wherein the first system is unavailable, including at least one of:

the terminal device does not detect a cell supporting the first system;

the terminal device does not camp on a cell supporting the first system;

the terminal equipment cannot be successfully registered in the first system;

the terminal equipment can not successfully initiate a service in the first system;

the cell in which the terminal device resides in the first system does not support the desired service.
The apparatus 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 of claims 25 to 33, wherein the first information is sent by the terminal device if it is redirected from the second system to the first system and the first system is detected as being unavailable.
The apparatus of any one of claims 25 to 34, further comprising:

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 apparatus of claim 35, wherein the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.
An information receiving apparatus, applied to a network device in a second system, the apparatus comprising:

the first information receiving module is used for receiving first information sent by terminal equipment, wherein the first information is sent by the terminal equipment under the condition that a first system is detected to be unavailable;

wherein the first information is used to inform a network device 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 apparatus of claim 38,

in the case that the first system is an Evolved Packet System (EPS), the capability information of the first system is used for indicating whether the terminal device supports an S1 mode;

or,

in the case where the first system is a 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 apparatus of claim 38 or 39,

in the case that 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 EPS supports or does not support control plane optimization, the EPS supports or does not support user plane optimization, the control plane optimization is preferred or the user plane optimization is preferred in the EPS, the EPS supports or does not support non-3 GPP protocol data transmission, and the EPS supports or does not support header compression of the control plane optimization;

or,

in the case that the first system is a 5GS system, the network behavior information expected by the terminal device in the first system includes at least one of: 5GS supports or does not support control plane optimization, 5GS supports or does not support user plane optimization, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3 GPP protocol data transport, 5GS supports or does not support control plane optimized header compression.
The apparatus according to any of claims 37 to 40, wherein the first information comprises indication information for indicating that the first system is not available.
The apparatus of claim 41, wherein the indication information comprises:

first indication information, which is used for indicating that the terminal equipment does not have the capability of accessing the first system;

and/or the presence of a gas in the gas,

second indication information for indicating 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 comprises: 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.
The apparatus of any one of claims 37 to 43, wherein the first system is unavailable, including at least one of:

the terminal device does not detect a cell supporting the first system;

the terminal device does not camp on a cell supporting the first system;

the terminal equipment cannot be successfully registered in the first system;

the terminal equipment can not successfully initiate a service in the first system;

the cell in which the terminal device resides in the first system does not support the desired service.
The apparatus according to any of claims 37 to 44, wherein the first information is a registration request message, the registration request message requesting registration in the second system.
The apparatus of any of claims 37 to 45, wherein the first information is sent by the terminal device if redirected from the second system to the first system and the first system is detected as unavailable.
The apparatus of any one of claims 37 to 46, further comprising:

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 the terminal device 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 of claim 47, wherein the update information comprises at least one of: capability information of the first system, network behavior information expected by the terminal device in the first system, and information indicating availability of the first system.
A terminal device, comprising a processor and a transceiver coupled to the processor; wherein:

the transceiver is used for transmitting first information to network equipment in a second system under the condition that the first system is detected to be unavailable;

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

the transceiver is used for receiving first information sent by a terminal device, wherein the first information is sent by the terminal device under the condition that a first system is detected to be 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 the storage medium has stored therein a computer program for execution by a processor of a terminal device to implement the information transmission method according to any one of claims 1 to 12.
A computer-readable storage medium, characterized in that a computer program is stored in the storage medium, which computer program is to be executed by a processor of a network device in a second system to implement the information receiving method according to any one of claims 13 to 24.