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

Abstract

The present application discloses an information sending method, receiving method, device, equipment and storage medium, and relates to the field of communication technology. The method comprises: when a terminal device detects that a first system is unavailable, the terminal device sends a first message to a network device in a second system; wherein the first message is used to inform the network device in the second system that the first system is unavailable. The embodiment of the present application can avoid the network device in the system where the terminal device is currently located 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, it can avoid the network device in the current system redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device from switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device accessing the communication system.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to an information sending method, receiving method, device, equipment and storage medium. Background Art

[0002] CIoT (Cellular Internet of Things) is an Internet of Things that uses NB-IoT (Narrowband Internet of Things) access technology or eMTC (Enhanced Machine Type Communication) access technology to enable CIoT terminals to access mobile communication networks.

[0003] A typical CIoT system is EPS (Evolved Packet System). To meet the needs of higher-speed services, 3GPP (3rd Generation Partnership Project) defines 5GS (5th Generation System). CIoT terminal devices that support 5GS and EPS systems can access the 5GS system or the EPS system. However, when a CIoT terminal device accesses the 5GS system, the 5GS system can redirect the CIoT terminal device to the EPS system based on the operator's policy or load balancing requirements; or, when a CIoT terminal device accesses the EPS system, the EPS system can redirect the CIoT terminal device to the 5GS system based on the operator's policy or load balancing requirements.

[0004] At present, the redirection issue of terminal devices needs further discussion. Summary of the invention

[0005] The embodiments of the present application provide an information sending method, receiving method, device, equipment and storage medium. The technical solution is as follows:

[0006] 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:

[0007] When detecting that the first system is unavailable, sending first information to a network device in the second system;

[0008] The first information is used to inform a network device in the second system that the first system is unavailable.

[0009] 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:

[0010] receiving first information sent by a terminal device, where the first information is sent by the terminal device when detecting that the first system is unavailable;

[0011] The first information is used to inform a network device in the second system that the first system is unavailable.

[0012] On the other hand, an embodiment of the present application provides an information sending device, which is applied to a terminal device, and the device includes:

[0013] A first information sending module, configured to send first information to a network device in a second system when detecting that the first system is unavailable;

[0014] The first information is used to inform a network device in the second system that the first system is unavailable.

[0015] On the other hand, 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:

[0016] A first information receiving module, configured to receive first information sent by a terminal device, wherein the first information is sent by the terminal device when detecting that the first system is unavailable;

[0017] The first information is used to inform a network device in the second system that the first system is unavailable.

[0018] In another aspect, an embodiment of the present application provides a terminal device, the terminal device comprising a processor and a transceiver connected to the processor; wherein:

[0019] The transceiver is used to send first information to the network device in the second system when detecting that the first system is unavailable;

[0020] The first information is used to inform a network device in the second system that the first system is unavailable.

[0021] In another aspect, an embodiment of the present application provides 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:

[0022] The transceiver is used to receive first information sent by a terminal device, where the first information is sent by the terminal device when detecting that the first system is unavailable;

[0023] The first information is used to inform the network device that the first system is unavailable.

[0024] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a terminal device to implement the above-mentioned information sending method.

[0025] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a network device in the second system to implement the above-mentioned information receiving method.

[0026] On the other hand, an embodiment of the present application provides a chip, which 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.

[0027] On the other hand, an embodiment of the present application provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a network device in a second system, it is used to implement the above-mentioned information receiving method.

[0028] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0029] When the terminal device detects that other systems other than the current system are unavailable, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, thereby avoiding the network device in the current system of the terminal device 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. In addition, in an embodiment of the present application, if the terminal device detects that other systems are unavailable after the network device in the current system redirects it to other systems, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, which can avoid the network device in the current system redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device accessing the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a system architecture provided by an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of an EPS system architecture provided by an embodiment of the present application;

[0032] Figure 3is a schematic diagram of a 5GS system architecture provided by an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a 5GS system architecture provided by another embodiment of the present application;

[0034] Figure 5 is a flow chart of a method for sending and receiving information provided by an embodiment of the present application;

[0035] Figure 6 is a flowchart of a method for sending and receiving information provided by another embodiment of the present application;

[0036] Figure 7 is a block diagram of an information sending device provided by an embodiment of the present application;

[0037] Figure 8 is a block diagram of an information sending device provided by another embodiment of the present application;

[0038] Fig. 9 is a block diagram of an information receiving device provided by an embodiment of the present application;

[0039] Fig.10 is a block diagram of an information receiving device provided by another embodiment of the present application;

[0040] Fig.11 is a structural block diagram of a terminal device provided by an embodiment of the present application;

[0041] Fig.12 It is a structural block diagram of a network device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0043] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0044] The technical solution provided in the embodiments of the present application can be applied to various communication systems, for example: GSM (Global System of Mobile Communication) system, CDMA (Code Division Multiple Access) system, ECDMA (Wideband Code Division Multiple Access) system, GPRS (General Packet Radio Service), LTE (Long Term Evolution) system, FDD (Frequency Division Duplex) system, TDD (Time Division Duplex) system, UMTS (Universal Mobile Telecommunication System), WiMAX (Worldwide Interoperability for Microwave Access) communication system, 5GS or New Radio (NR), etc.

[0045] Please refer to Figure 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.

[0046] 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) station, a PDA (Personal Digital Assistant), a handheld device with 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 a 5GS or a terminal device in a future evolved PLMN (Public Land Mobile Network), etc., and the embodiments of the present application are not limited to this. Optionally, the terminal device in the embodiments of the present application 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.

[0047] Access network equipment is a device deployed in the access network to provide wireless communication functions for the terminal device 10. Access network equipment may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network equipment functions may be different. For example, in the 5GS system, it is called gNodeB or gNB; in the EPS system, it is 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 equipment.

[0048] The core network device refers to a device that can provide session management, mobility management, policy management, security authentication and other functions for the terminal device 10. 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 device can be implemented as AMF (Core Access and Mobility Management Function); in the EPS system, the core network device can be implemented as MME (Mobility Management Entity).

[0049] In the embodiment of the present application, 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, wherein the first access network 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, and the embodiment of the present application is not limited to this. 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 MME, the second access network device 40 may be RAN (Radio Access Network) or one or more gNBs in RAN, and the second core network device 50 may be AMF. Of course, if the first system and the second system are other existing systems or future systems, then each network device in the present application is a corresponding network device in these systems.

[0050] Figure 2 FIG. 1 is a schematic diagram showing the system architecture of the EPS system provided in the embodiment of the present application. Figure 2 As shown, the system architecture 200 may include the following network entities:

[0051] 1. EUTRAN: A network composed of multiple eNodeBs (Evolved NodeBs) that implements wireless physical layer functions, resource scheduling and wireless resource management, wireless access control, and mobility management functions. eNodeBs can be connected to each other through the X2 interface, which can be used to transmit data during the X2-based switching process. eNodeBs are connected to SGW (Serving Gateway) through the user plane interface SI-U, and use GTP-U (General Packet Radio System General Tunneling Protocol User Plane) to transmit user data: they are connected to MME (Mobility Management Entity) through the control plane interface SI-E, and use the SI-AP protocol to implement functions such as wireless access bearer control.

[0052] 2. MME: Mainly responsible for all control plane functions of user and session management, including NAS (Non-Access-Stratum) signaling and security, management of tracking area lists, selection of P-GW (Packet Data Network Gateway) and SGW, etc.

[0053] 3. SGW: Mainly responsible for data transmission, forwarding and route switching of user equipment, and serves as the local mobility anchor point when the user equipment switches between eNodeBs (for each user equipment, there is only one SGW serving it at each time).

[0054] 4. P-GW: As the anchor point of PDN (Packet Data Network) connection, it is responsible for IP address allocation for user equipment, data packet filtering, rate control, generation of billing information, etc.

[0055] 5. SGSN (Serving GPR Supporting Node): It is the access node of 2G access network GERAN (GSM / EDGE Radio Access Network), 3G access network UTRAN (Universal Terrestrial Radio Access Network) and EPS core network EPC, responsible for establishing bearers and forwarding data from GERAN, UTRAN to EPC.

[0056] 6. HSS (Home Subscriber Server): stores the subscription data of mobile users.

[0057] 7. PCRF (Policy and Charging Rules Function): responsible for charging management and policy control, including PCC (Policy and Charging Control) rules and QoS (Quality of Service) rules.

[0058] Figure 3 FIG. 1 is a schematic diagram showing the system architecture of the 5GS system provided in the embodiment of the present application. Figure 3As shown, the system architecture 200 may include: UE, RAN, Core (core network) and DN. Among them, UE, RAN, Core are the main components of the architecture. Logically, they can be divided into two parts: user plane and control plane. 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.

[0059] UE: It is the entry point for mobile users to interact with the network. It can provide basic computing and storage capabilities, display service windows to users, and accept user operation input. UE will use the next generation air interface technology to establish signal and data connections with RAN, thereby transmitting control signals and service data to the mobile network.

[0060] RAN: Similar to the base station in the traditional network, it is deployed close to the UE, provides network access for authorized users in a specific area, and can use transmission tunnels of different qualities to transmit user data according to the user level and business requirements. RAN can manage its own resources, use them reasonably, provide access services to UE on demand, and forward control signals and user data between UE and the core network.

[0061] Core: Responsible for maintaining the subscription 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, it provides the UE with network access authentication; when the UE has a service request, it allocates network resources to the UE; when the UE moves, it updates the network resources for the UE; when the UE is idle, it provides the UE 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 the UE with data routing functions, such as forwarding uplink data to the DN; or receiving UE downlink data from the DN, forwarding it to the RAN, and then sending it to the UE.

[0062] 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 proprietary network jointly deployed by operators, such as for configuring IMS (IP Multimedia Core Network Subsystem) services.

[0063] Figure 4 is Figure 3The detailed architecture is determined based on the core network, where the core network user plane includes UPF (User Plane Function); the core network control plane includes AUSF (Authentication Server Function), AMF, SMF, NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (NF Repository Function), UDM (Unified Data Management), PCF (Policy Control Function), AF (Application Function). The functions of these functional entities are as follows:

[0064] UPF: performs user data packet forwarding according to the routing rules of SMF;

[0065] AUSF: performs security authentication of UE;

[0066] AMF: UE access management and mobility management;

[0067] SMF: UE session management;

[0068] NSSF: selects network slice for UE;

[0069] NEF: Opens network functions to third parties via northbound APIs.

[0070] NRF: Provides storage and selection functions for network function entity information for other network elements;

[0071] UDM: User contract context management;

[0072] PCF: User Policy Management;

[0073] AF: User application management.

[0074] exist Figure 4 In the architecture shown, the N1 interface is the reference point between the UE and the AMF; the N2 interface is the reference point between the RAN and the AMF, which is used for sending NAS messages, etc.; the N3 interface is the reference point between the RAN and the UPF, which is used for transmitting user plane data, etc.; the N4 interface is the reference point between the SMF and the UPF, which is used for transmitting information such as the tunnel identification information of the N3 connection, data cache indication information, and downlink data notification messages; the N6 interface is the reference point between the UPF and the DN, which is used for transmitting user plane data, etc.

[0075] It should be noted that Figure 3 and Figure 4 The interface name between the various network elements is only an example. The name of the interface in a specific implementation may be other names, and the embodiments of the present application do not specifically limit this. Figure 3 and Figure 4 The names of the various network elements (such as SMF, AF, UPF, etc.) included in are only examples and do not limit the functions of the network elements themselves. In 5GS and other future networks, the above-mentioned network elements may also have other names, and the embodiments of the present application do not specifically limit this. For example, in a 6G network, some or all of the above-mentioned network elements may use the terminology in 5G, or may use other names, etc., which are uniformly explained here and will not be repeated below. In addition, it should be understood that the name of the message (or signaling) transmitted between the above-mentioned network elements is only an example and does not constitute any limitation on the function of the message itself.

[0076] In one example, the above Figure 1 The system architecture shown can be used to perform a redirection method for a terminal device. Exemplarily, 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 carried in the registration request and the expected network behavior information in the second system when the terminal device 10 registers in the first system. The first core network device 30 can instruct the first access network device 20 to trigger the switching process through the redirection indication information. Then, the first access network device 20 can trigger the inter-system switching by sending a switching requirement message to the second core network device 50 to switch the terminal device from the first system to the second system, thereby solving the redirection problem between two different systems. However, if after redirection, the terminal device cannot find a cell that supports connection under the second system, the terminal device re-initiates a registration request to the first 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 will cause the terminal device to access the network for a long time, that is, the terminal device cannot obtain network services for a long period of time.

[0077] Based on this, the embodiment of the present application provides a method for sending and receiving information, by which, when the terminal device detects that other systems other than the current system are unavailable, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, thereby avoiding the network device in the current system of the terminal device 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. In addition, in the embodiment of the present application, if the terminal device detects that other systems are unavailable after the network device in the current system redirects it to other systems, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, which can avoid the network device in the current system redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device accessing the communication system.

[0078] The technical solution of the present application will be introduced and explained below in conjunction with several exemplary embodiments.

[0079] Please refer to Figure 5 , which shows a flowchart of a method for sending and receiving information provided by an embodiment of the present application, which can be applied to Figures 1 to 4 In the system architecture shown, the method may include the following steps:

[0080] Step 510: When the terminal device detects that the first system is unavailable, the terminal device sends first information to a network device in the second system.

[0081] 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 the communication system, and if the communication system is not reachable, it will not access the communication system. In an embodiment of the present application, the terminal device can detect the system reachability of the first system, and if it is detected that the first system is not reachable, that is, if the first system is not available, the terminal device sends the first information to the network device in the second system. Optionally, the first system is unavailable, including at least one of the following situations: 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; the terminal device does not reside in a cell supporting the first system, for example, the channel quality of the cell supporting the first system is not sufficient for the terminal device to reside, or the cell supporting the first system is prohibited from registration; the terminal device cannot successfully register in the first system, for example, the first system rejects the registration request of the terminal device, or the terminal device has no contract information; the terminal device cannot successfully initiate a service in the first system, for example, the first system does not have the service capability; the cell where the terminal device resides in the first system does not support the expected service, for example, the first system does not support the CIoT service expected by the terminal device.

[0082] The network device in the second system may be a core network device in the second system. Optionally, the network device in the second system may be a core network device in the second system for access management and mobility management of the terminal device, that is, the network device in the second system may be a mobile 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 may be implemented as a core network device with a mobile management network element function in other communication systems. In an embodiment of the present application, when the terminal device detects that the first system is unavailable, the terminal device may send a first message to the network device in the second system, and the first message is used to inform the network device in the second system that the first system is unavailable, that is, after the network device in the second system receives the first message, it can determine that the first system cannot provide network services for the terminal device according to the first message. Optionally, the first message is a registration request message, or the first message 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 by the terminal device when it 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 the terminal device initiates a registration request 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, and then the terminal device initiates a registration request to the network device in the second system for the second time when it detects that the first system is unavailable. The registration request message sent by the terminal device to the network device in the second system when the terminal device initiates the 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 the terminal device initiates the registration request to the network device in the second system for the first time, then the terminal device may carry the first information in the registration request message sent when the terminal device initiates the registration request to the network device in the second system for the first time, or the registration request message is the first information.

[0083] In one 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 the network behavior information expected by the terminal device in the first system, the second system can confirm that the terminal device does not expect to access the first system, and further, the second system can confirm that the first system is unavailable based on the first information, so as not to redirect the terminal device to the first system.

[0084] 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 to indicate whether the terminal device supports the N1 mode.

[0085] 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: whether EPS supports or does not support control plane optimization, whether EPS supports or does not support user plane optimization, whether control plane optimization is preferred or user plane optimization is preferred in EPS, whether EPS supports or does not support non-3GPP protocol data transmission, and whether EPS supports or does not support header compression of control plane optimization; 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: whether 5GS supports or does not support control plane optimization, whether 5GS supports or does not support user plane optimization, whether control plane optimization is preferred or user plane optimization is preferred in 5GS, whether 5GS supports or does not support non-3GPP protocol data transmission, and whether 5GS supports or does not support header compression of control plane optimization.

[0086] In another example, the first information includes indication information for 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 as not to redirect the terminal device to the first system. Optionally, the indication information included in the first information may include: first indication information for indicating that the terminal device does not have the ability to access 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 terminal device may not have the ability to access the first system because the first system does not support the service expected by the terminal device, or because the terminal device does not have the contract information, or because the terminal device cannot reside in the cell supporting 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 indication information by the network device in the second system and respond to the indication information of the terminal device in a timely manner, the first indication information may only clearly indicate that the terminal device does not have the ability to access the first system, without having to include the reason why the terminal device does not have the ability to access the first system, so as to avoid the network device in the second system from needing to confirm that the terminal device does not have the ability to access the first system according to the reason. Optionally, in order to improve the processing of the indication information by the network device in the second system and to respond to the indication information of the terminal device in a timely manner, the second indication information may also only clearly indicate that the terminal device does not expect the network behavior of the first system.

[0087] 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 scenario in the future, the terminal device may expect the network behavior of the first system, or the terminal device may have the ability to access the first system. If the network device in the second system to which the terminal device accesses is unclear about the network device information that the terminal device expects in the first system, then after the terminal device expects the network behavior of the first system, or the terminal device has the ability to access the first system, the terminal device needs to send indication information to the network device in the second system again to indicate the network behavior information that the terminal device expects in the first system. Based on this, an embodiment of the present application provides a method that can avoid the terminal device sending indication information to the network device in the second system multiple times and avoid redundant signaling overhead, that is, optionally, the first information also includes: the network behavior information expected by the terminal device in the first system, and / or, the network behavior information expected by the terminal device in the second system. That is, when the terminal device initiates a registration request to the network device in the second system, it can carry in the first information the indication information for indicating that the first system is unavailable, and carry the network behavior information expected by the terminal device in the first system, and / or the 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 the terminal device having to send the network behavior expected in the first system to the network device in the second system again when the second system is available.

[0088] In a possible implementation, after 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, the terminal device sends update information to the network device in the 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 network services. In the embodiment of the present application, when the terminal device accesses the second system, it may 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 may 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 the network device in the second system receives the update information, it may redirect the terminal device to the first system according to the update information. 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 indicating that the first system is available.

[0089] In summary, the technical solution provided by the embodiment of the present application is that when the terminal device detects that other systems other than the current system are unavailable, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, thereby avoiding the network device in the current system of the terminal device 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. In addition, in the embodiment of the present application, if the terminal device detects that other systems are unavailable after the network device in the current system redirects it to other systems, the network device in the current system sends information indicating that other systems are unavailable to the network device in the current system, which can avoid redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device from switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device in accessing the communication system.

[0090] In addition, an embodiment of the present application provides two types of contents included in the information for indicating that other systems are unavailable. One is that the information does not include capability information of other systems or network behavior of other systems 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 determine that other systems are unavailable or the terminal device does not expect to access other systems based on the information, so as to further determine not to redirect the terminal device to other systems; the other is that the information includes indication information indicating that other systems are unavailable, so that after the network device in the current system receives the information sent by the terminal device, it can directly determine not to redirect the terminal device to other systems, so as to facilitate the network device in the current system to determine whether to redirect the terminal device to other systems.

[0091] In addition, in the technical solution provided in the embodiment of the present application, if the terminal device is connected to the current system and detects that other systems are available, update information can be sent to the network devices in the current system to inform the network devices in the current system that other systems are available, so that the network devices in the current system can determine whether to redirect the terminal device to other systems based on the update information to meet load balancing requirements, etc.

[0092] The technical solution of this application is described below with a specific example. Figure 6 , assuming that the first system is the EPS system and the second system is the 5GS system, at this time, the network device in the second system can be implemented as AMF. The above information sending and receiving method includes the following steps:

[0093] Step 610: The terminal device sends a registration request message to the AMF. When the terminal device initiates a registration request to the AMF, the terminal device may send a registration request message to the AMF, and 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 device in the EPS system, and network behavior information expected by the terminal device in the 5GS system.

[0094] Step 620: AMF redirects the terminal device to the EPS system. After receiving the registration request message of the terminal device, AMF can redirect the terminal device from the AMF system to the EPS system according to the load balancing requirements and operator policies. At this time, AMF can instruct the access network device in the 5GS system to trigger the handover process through the redirection indication information, and then the access network device in the 5GS system sends a handover requirement message to the MME to trigger the inter-system handover process.

[0095] 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 there is a cell supporting the EPS system, whether the cell supporting the EPS system can be resident, whether the EPS system can successfully initiate a service, and whether the cell that can be resident in the EPS system supports the expected service.

[0096] Step 640: When the terminal device detects that the EPS system is unavailable, it sends a first message to the AMF. When the terminal device encounters any of the following situations during the detection process, the EPS system is considered to be unavailable: no cell supporting the EPS system is detected, the cell supporting the EPS system cannot be resident, the service cannot be successfully initiated in the EPS system, and the cell resident in the EPS system does not support the expected service. When the terminal device detects that the EPS system is unavailable, it sends a first message to the AMF, and the first message is used to inform the AMF that the EPS system to which it is redirected is unavailable.

[0097] 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 in combination with a load balancing strategy, etc.;

[0098] Step 660: AMF sends a registration response message to the terminal device if it is determined that the terminal device is not redirected to the EPS system. If the EPS system is unavailable, in order to provide network services to the terminal device in a timely manner, AMF may send a registration response message to the terminal device and also determine to connect the terminal device to the 5GS system to obtain network services.

[0099] 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.

[0100] Step 680: When the terminal device detects that the first system is available, the terminal device sends update information to the AMF; When the terminal device detects that the first system is available, the terminal device may send update information to the AMF, and the update information may include at least one of the following: capability information of the EPS system, network behavior information expected by the terminal device in the EPS system, and information indicating that the EPS system is available;

[0101] Step 690, AMF determines whether to redirect the terminal device to the EPS system based on the update information; after receiving the update information of the terminal device, AMF can determine whether to redirect the terminal device to the EPS system based on the update information and in combination with the load balancing strategy, etc.

[0102] It should be noted that in the above method embodiment, the technical solution of the present application is mainly introduced and explained from the perspective of the interaction between the terminal device and the network device in the second system. The above steps performed by the terminal device can be independently implemented as an information sending method on the terminal device side; the above steps performed by the network device in the second system can be independently implemented as an information receiving method on the network device side in the second system.

[0103] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0104] Please refer to Figure 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 implementing the method example on the terminal device side mentioned above, and the function can be implemented by hardware, or by hardware executing corresponding software. The device can be the terminal device mentioned above, or it can be set in the terminal device. Figure 7 As shown, the device 700 may include: a first information sending module 710.

[0105] The first information sending module 710 is used to send first information to the network equipment in the second system when it is detected that the first system is unavailable; wherein the first information is used to inform the network equipment in the second system that the first system is unavailable.

[0106] 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.

[0107] 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, when 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.

[0108] 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 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-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

[0109] Optionally, the first information includes indication information for indicating that the first system is unavailable.

[0110] 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 that the terminal device does not expect network behavior of the first system.

[0111] 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.

[0112] Optionally, the first system is unavailable, including at least one of the following situations: the terminal device does not detect a cell supporting the first system; the terminal device does not reside in a cell supporting 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.

[0113] Optionally, the first information is a registration request message, and the registration request message is used to request registration in the second system.

[0114] 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 detects that the first system is unavailable.

[0115] Alternatively, if Figure 8 As shown, the device 700 also includes: an update information sending module 720, which is used to send update information to the network equipment in the second system when it is detected that the first system is available; wherein the update information is used to inform the network equipment in the second system that the first system is available.

[0116] 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 indicating that the first system is available.

[0117] In summary, the technical solution provided by the embodiment of the present application is that when the terminal device detects that other systems other than the current system are unavailable, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, thereby avoiding the network device in the current system of the terminal device 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. In addition, in the embodiment of the present application, if the terminal device detects that other systems are unavailable after the network device in the current system redirects it to other systems, the network device in the current system sends information indicating that other systems are unavailable to the network device in the current system, which can avoid redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device from switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device in accessing the communication system.

[0118] 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 implementing the method example of the network device side in the second system mentioned above, and the function can be implemented by hardware, or by hardware executing corresponding software. The device can be the network device in the second system mentioned above, or it can be set in the network device in the second system. Fig. 9 As shown, the device 900 may include: a first information receiving module 910.

[0119] The first information receiving module 910 is used 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 a network device in the second system that the first system is unavailable.

[0120] 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.

[0121] 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, when 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.

[0122] 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 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-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

[0123] Optionally, the first information includes indication information for indicating that the first system is unavailable.

[0124] 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 that the terminal device does not expect network behavior of the first system.

[0125] 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.

[0126] Optionally, the first system is unavailable, including at least one of the following situations: the terminal device does not detect a cell supporting the first system; the terminal device does not reside in a cell supporting 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.

[0127] Optionally, the first information is a registration request message, and the registration request message is used to request registration in the second system.

[0128] 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 detects that the first system is unavailable.

[0129] Alternatively, if Fig.10 As shown, the device 900 also includes: an update information receiving module 920, which is used to receive update information sent by the terminal device, and 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 the network device in the second system that the first system is available.

[0130] 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 indicating that the first system is available.

[0131] In summary, the technical solution provided by the embodiment of the present application is that when the terminal device detects that other systems other than the current system are unavailable, the terminal device sends information indicating that other systems are unavailable to the network device in the current system, thereby avoiding the network device in the current system of the terminal device 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. In addition, in the embodiment of the present application, if the terminal device detects that other systems are unavailable after the network device in the current system redirects it to other systems, the network device in the current system sends information indicating that other systems are unavailable to the network device in the current system, which can avoid redirecting the terminal device to other systems again when processing the registration request of the terminal device, avoiding the terminal device from switching back and forth between the current system and other systems, reducing the delay of the terminal device in obtaining network services, and improving the efficiency of the terminal device in accessing the communication system.

[0132] One point that needs to be explained is that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0133] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0134] Please refer to Fig.11 , which shows a schematic diagram of the structure of a terminal device 110 provided in 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. Specifically, the terminal device 110 may include a processor 111, a receiver 112, a transmitter 113, a memory 114, and a bus 115.

[0135] The processor 111 includes one or more processing cores. The processor 111 executes various functional applications and information processing by running software programs and modules.

[0136] The receiver 112 and the transmitter 113 may be implemented as a transceiver 116 , which may be a communication chip.

[0137] The memory 114 is connected to the processor 111 via a bus 115 .

[0138] The memory 114 may be used to store a computer program, and the processor 111 may be used to execute the computer program to implement each step performed by the terminal device in the above method embodiment.

[0139] In addition, the memory 114 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, 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, tape cassette, magnetic tape, disk storage or other magnetic storage devices. Among them:

[0140] The transceiver 116 is used to send 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 the network device in the second system that the first system is unavailable.

[0141] 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.

[0142] 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, when 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.

[0143] 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 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-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

[0144] Optionally, the first information includes indication information for indicating that the first system is unavailable.

[0145] 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 that the terminal device does not expect network behavior of the first system.

[0146] 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.

[0147] Optionally, the first system is unavailable, including at least one of the following situations: the terminal device does not detect a cell supporting the first system; the terminal device does not reside in a cell supporting 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.

[0148] Optionally, the first information is a registration request message, and the registration request message is used to request registration in the second system.

[0149] 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 detects that the first system is unavailable.

[0150] Optionally, the transceiver 116 is further configured to send update information to a network device in the second system when detecting that the first system is available; wherein the update information is used to inform the network device in the second system that the first system is available.

[0151] 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 indicating that the first system is available.

[0152] Please refer to Fig.12 , which shows a schematic diagram of the structure of a network device 120 provided in an embodiment of the present application. For example, the network device may be the network device in the second system described above, and is used to execute the information receiving method on the network device side in the second system described above. Specifically, the network device 120 may include a processor 121, a receiver 122, a transmitter 123, a memory 124, and a bus 125.

[0153] The processor 121 includes one or more processing cores. The processor 121 executes various functional applications and information processing by running software programs and modules.

[0154] The receiver 122 and the transmitter 123 may be implemented as a transceiver 126 , which may be a communication chip.

[0155] The memory 124 is connected to the processor 121 via a bus 125 .

[0156] The memory 124 may be used to store a computer program, and the processor 121 may be used to execute the computer program to implement each step performed by the network device in the second system in the above method embodiment.

[0157] In addition, the memory 124 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, 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, tape cassettes, magnetic tapes, disk storage or other magnetic storage devices. Among them:

[0158] The transceiver 126 is used 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.

[0159] 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.

[0160] 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, when 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.

[0161] 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 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-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

[0162] Optionally, the first information includes indication information for indicating that the first system is unavailable.

[0163] 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 that the terminal device does not expect network behavior of the first system.

[0164] 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.

[0165] Optionally, the first system is unavailable, including at least one of the following situations: the terminal device does not detect a cell supporting the first system; the terminal device does not reside in a cell supporting 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.

[0166] Optionally, the first information is a registration request message, and the registration request message is used to request registration in the second system.

[0167] 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 detects that the first system is unavailable.

[0168] Optionally, the transceiver 126 is further used to receive update information sent by the terminal device, wherein 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 a network device in the second system that the first system is available.

[0169] 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 indicating that the first system is available.

[0170] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a terminal device to implement the above-mentioned information sending method.

[0171] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a network device in the second system to implement the above-mentioned information receiving method.

[0172] An embodiment of the present application also provides a chip, which 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.

[0173] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a network device in a second system, it is used to implement the above-mentioned information receiving method.

[0174] The present application also provides a computer program product. When the computer program product is run on a computer on a terminal device side, the computer is enabled to execute the above-mentioned information sending method on the terminal device side.

[0175] The present application also provides a computer program product. When the computer program product runs on a computer on the network device side of the second system, the computer executes the information receiving method on the network device side of the second system.

[0176] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0177] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for sending information, characterized in that: Applied to a terminal device, the method comprises: When detecting that the first system is unavailable, sending first information to a network device in the second system; The first information is used to inform the network device in the second system that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

2. The method according to claim 1, characterized in that 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.

3. The method according to claim 2, characterized in that In the case where 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 where 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.

4. The method according to claim 2 or 3, characterized in that: In the case where 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, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

5. The method according to claim 1, characterized in that: The instruction information includes: 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.

6. The method according to claim 1, characterized in that The first system is unavailable, including at least one of the following situations: The terminal device fails to detect a cell supporting the first system; The terminal device does not reside in a cell supporting the first system; The terminal device cannot be successfully registered 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.

7. The method according to claim 1, characterized in that The first information is a registration request message, and the registration request message is used to request registration in the second system.

8. The method according to claim 1, characterized in that The first information is sent by the terminal device when the terminal device is redirected from the second system to the first system and detects that the first system is unavailable.

9. The method according to claim 1, characterized in that: After sending the first information to the network device in the second system, the method further includes: When detecting that the first system is available, sending 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.

10. The method according to claim 9, characterized in that 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 indicating that the first system is available.

11. A method for receiving information, characterized in that: The method is applied to a network device in a second system, and comprises: receiving first information sent by a terminal device, where the first information is sent by the terminal device when detecting that the first system is unavailable; The first information is used to inform the network device in the second system that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

12. The method according to claim 11, characterized in that 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.

13. The method according to claim 12, characterized in that In the case where 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 where 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.

14. The method according to claim 12 or 13, characterized in that In the case where 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, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

15. The method according to claim 11, characterized in that The instruction information includes: 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.

16. The method according to claim 11, characterized in that The first system is unavailable, including at least one of the following situations: The terminal device fails to detect a cell supporting the first system; The terminal device does not reside in a cell supporting the first system; The terminal device cannot be successfully registered 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.

17. The method according to claim 11, characterized in that The first information is a registration request message, and the registration request message is used to request registration in the second system.

18. The method according to claim 11, characterized in that The first information is sent by the terminal device when the terminal device is redirected from the second system to the first system and detects that the first system is unavailable.

19. The method according to claim 11, characterized in that After receiving the first information sent by the terminal device, the method further includes: receiving update information sent by the terminal device, where the update information is sent by the terminal device when detecting that the first system is available; The update information is used to inform the network device in the second system that the first system is available.

20. The method according to claim 19, characterized in that 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 indicating that the first system is available.

21. An information sending device, characterized in that: Applied to a terminal device, the device comprises: A first information sending module, configured to send first information to a network device in a second system when detecting that the first system is unavailable; The first information is used to inform the network device in the second system that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

22. The device according to claim 21, characterized in that 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.

23. The device according to claim 22, characterized in that In the case where 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 where 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.

24. The device according to claim 22 or 23, characterized in that In the case where 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, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

25. The device according to claim 21, characterized in that The instruction information includes: 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.

26. The device according to claim 21, characterized in that The first system is unavailable, including at least one of the following situations: The terminal device fails to detect a cell supporting the first system; The terminal device does not reside in a cell supporting the first system; The terminal device cannot be successfully registered 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.

27. The device according to claim 21, characterized in that The first information is a registration request message, and the registration request message is used to request registration in the second system.

28. The device according to claim 21, characterized in that The first information is sent by the terminal device when the terminal device is redirected from the second system to the first system and detects that the first system is unavailable.

29. The device according to claim 21, characterized in that The device also includes: An update information sending module, configured to send update information to a network device in the second system when detecting that the first system is available; The update information is used to inform the network device in the second system that the first system is available.

30. The device according to claim 29, characterized in that 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 indicating that the first system is available.

31. An information receiving device, characterized in that: A network device applied to a second system, the device comprising: A first information receiving module, configured to receive first information sent by a terminal device, wherein the first information is sent by the terminal device when detecting that the first system is unavailable; The first information is used to inform the network device in the second system that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

32. The device according to claim 31, characterized in that 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.

33. The device according to claim 32, characterized in that In the case where 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 where 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.

34. The device according to claim 32 or 33, characterized in that In the case where 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, control plane optimization is preferred or user plane optimization is preferred in EPS, EPS supports or does not support non-3GPP protocol data transmission, and EPS supports or does not support header compression of control plane optimization; 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, control plane optimization is preferred or user plane optimization is preferred in 5GS, 5GS supports or does not support non-3GPP protocol data transmission, and 5GS supports or does not support header compression of control plane optimization.

35. The device according to claim 31, characterized in that The instruction information includes: 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.

36. The device according to claim 31, characterized in that The first system is unavailable, including at least one of the following situations: The terminal device fails to detect a cell supporting the first system; The terminal device does not reside in a cell supporting the first system; The terminal device cannot be successfully registered 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.

37. The device according to claim 31, characterized in that The first information is a registration request message, and the registration request message is used to request registration in the second system.

38. The device according to claim 31, characterized in that The first information is sent by the terminal device when the terminal device is redirected from the second system to the first system and detects that the first system is unavailable.

39. The device according to claim 31, characterized in that The device also includes: An update information receiving module, configured to receive update information sent by the terminal device, wherein the update information is sent by the terminal device when the terminal device detects that the first system is available; The update information is used to inform the network device in the second system that the first system is available.

40. The device according to claim 39, characterized in that 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 indicating that the first system is available.

41. A terminal device, characterized in that: The terminal device includes a processor and a transceiver connected to the processor; wherein: The transceiver is used to send first information to the network device in the second system when detecting that the first system is unavailable; The first information is used to inform the network device in the second system that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

42. A network device, characterized in that: The network device is in the second system, and the network device includes a processor and a transceiver connected to the processor; wherein: The transceiver is used to receive first information sent by a terminal device, where the first information is sent by the terminal device when detecting that the first system is unavailable; The first information is used to inform the network device that the first system is unavailable. The first information includes indication information for indicating that the first system is unavailable, and the first information also includes: network behavior information expected by the terminal device in the first system and network behavior information expected by the terminal device in the second system.

43. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to be executed by a processor of a terminal device to implement the information sending method according to any one of claims 1 to 10.

44. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to be executed by a processor of a network device in the second system to implement the information receiving method according to any one of claims 11 to 20.

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