User terminal switching method and device and communication equipment

Abstract

The invention discloses a user terminal switching method and device and communication equipment. The method comprises the steps that the signal strength of a user terminal is acquired, and the user terminal is registered to a 5G core network; when the signal strength of the user terminal is lower than the first preset strength, directly sending an attachment request to a non-ground network core network of the Internet of Things; and receiving an attachment receiving message sent by the non-ground core network of the Internet of Things, and switching from the 5G core network to the non-ground core network of the Internet of Things. According to the method and the device, the technical problem of relatively long switching delay of the user terminal in a non-ground network scene in related technologies is solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a user terminal switching method, device and communication equipment. Background Art

[0002] After the user accesses the ground 5GC (5G Core Network) network, due to the large signal attenuation, the ground 5G base station cannot provide reliable data transmission capabilities. The UE accesses the satellite IoT NTN (Internet of Things Non-terrestrial Network) network covered by the signal, that is, the satellite-to-ground switching process is performed. In the early stage of network construction, IoT NTN and the ground provincial network are deployed independently. Since the N26 interface between the IoT NTN private network MME (Mobility Management Entity) and the ground provincial network AMF (Access and Mobility Function) has a significant impact on the ground network, and at the same time, the current terminal is generally in single registration mode. To implement the dual registration mode of terminal upgrade, the terminal must be upgraded, and the transformation is large. In the related technology, the UE that supports single registration needs to first send a TAU (Tracking Area Update) request to the 4G base station and MME, resulting in waste of satellite-to-ground interaction resources and interaction delays. Summary of the invention

[0003] The embodiments of the present application provide a user terminal switching method, apparatus and communication equipment to at least solve the technical problem of long user terminal switching delay in non-terrestrial network scenarios in the related art.

[0004] According to one aspect of an embodiment of the present application, a user terminal switching method is provided, including: obtaining the signal strength of the user terminal, wherein the user terminal has been registered with a 5G core network; when the signal strength of the user terminal is lower than a first preset strength, directly sending an attachment request to an Internet of Things non-terrestrial network core network; receiving an attachment acceptance message sent by the Internet of Things non-terrestrial network core network, and switching from the 5G core network to the Internet of Things non-terrestrial network core network.

[0005] Optionally, directly sending an attachment request to the Internet of Things non-terrestrial network core network includes: detecting the signal strength of the Internet of Things non-terrestrial network, and obtaining the configuration information of the user terminal when the signal strength of the Internet of Things non-terrestrial network is higher than a second preset strength; and sending an attachment request to the Internet of Things non-terrestrial network core network when the configuration information of the user terminal meets preset conditions.

[0006] Optionally, the method further includes: when the configuration information of the user terminal indicates that the user terminal is a satellite access terminal and the user terminal is in a single registration mode, determining that the configuration information meets the preset condition.

[0007] Optionally, sending an attachment request to the Internet of Things non-terrestrial network core network includes: generating the attachment request message, the attachment request message including at least: identity information of the user terminal and the type of the user terminal, wherein the type of the user terminal is a satellite access terminal; sending the attachment request message to the Internet of Things non-terrestrial network core network.

[0008] Optionally, the method also includes: receiving an attachment acceptance message sent by the Internet of Things non-terrestrial network core network, wherein the attachment acceptance message is sent to the user terminal after the Internet of Things non-terrestrial network core network determines that the user terminal is in single registration mode and the user terminal is a satellite access terminal.

[0009] Optionally, before receiving the attachment acceptance message sent by the IoT non-terrestrial network core network, the method also includes: sending a session release request to the 5G core network, wherein the session release request is used to release the protocol data unit session between the user terminal and the 5G core network.

[0010] Optionally, the method also includes: receiving a session release confirmation message sent by the 5G core network, wherein the session release confirmation message is used to indicate that the protocol data unit session between the user terminal and the 5G core network has been released.

[0011] According to another aspect of an embodiment of the present application, a user terminal switching device is also provided, including: an acquisition module for acquiring the signal strength of the user terminal, wherein the user terminal has been registered with the 5G core network; a sending module for directly sending an attachment request to the Internet of Things non-terrestrial network core network when the signal strength of the user terminal is lower than a first preset strength; a receiving module for receiving an attachment acceptance message sent by the Internet of Things non-terrestrial network core network, and switching from the 5G core network to the Internet of Things non-terrestrial network core network.

[0012] According to another aspect of an embodiment of the present application, a communication device is also provided, including: a memory and a processor, wherein the memory is used to store program instructions; and the processor is connected to the memory and is used to execute the above-mentioned user terminal switching method.

[0013] According to another aspect of the embodiments of the present application, a non-volatile storage medium is provided, which includes a stored computer program, wherein the device where the non-volatile storage medium is located executes the above-mentioned user terminal switching method by running the computer program.

[0014] According to another aspect of the embodiments of the present application, a communication system is also provided, including computer instructions, which implement the above-mentioned user terminal switching method when executed by a processor.

[0015] In an embodiment of the present application, by obtaining the signal strength of a user terminal, wherein the user terminal has been registered with a 5G core network; when the signal strength of the user terminal is lower than a first preset strength, directly sending an attachment request to the IoT non-terrestrial network core network; receiving an attachment acceptance message sent by the IoT non-terrestrial network core network, switching from the 5G core network to the IoT non-terrestrial network core network is achieved, thereby avoiding the user terminal initiating a TAU process first and then initiating an attachment request after being rejected, thereby achieving the technical effect of reducing the switching delay, and further solving the technical problem of long switching delay of user terminals in non-terrestrial network scenarios in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a hardware structure block diagram of a computer terminal for implementing a user terminal switching method according to an embodiment of the present application;

[0018] Figure 2 is a flow chart of a user terminal switching method according to an embodiment of the present application;

[0019] Figure 3 is a flow chart of another user terminal switching method according to an embodiment of the present application;

[0020] Figure 4 It is a structural diagram of a user terminal switching device according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The information collected in the embodiments of the present application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with the relevant laws, regulations and standards of the relevant regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or reject automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0024] In the related art, the process of switching a user terminal from a terrestrial 5G core network to an IoT non-terrestrial network core network is as follows:

[0025] Step 1, UE registers to the ground 5GC; Step 2, based on UE capabilities, in single registration mode, UE triggers the TAU process for MME. After receiving the TAU process, MME cannot obtain user context information because there is no N26 interface between 5GC and MME, and then MME sends TAU Reject to UE, instructing UE to attach to EPC first; Step 3, if MME determines that the old node is AMF based on the UE GUTI mapped from 5G-GUTI (Globally Unique Temporary UE Identity, an identifier that is unique and temporarily assigned to user equipment globally), and MME is configured to support 5GS-EPS interoperability and does not interact through the N26 interface, then MME sends TAU Reject to UE; Step 4, UE attachment process to EPC; Step 5, in the single registration scenario, 5GC PDU Session (protocol data unit session) is mapped to EPC APN Connectivity (APN connection under EPC network); Step 5, PGW+C+SMF (a combined entity of PDN gateway, control plane and SMF) releases PDUSession of 5GC. As a result, the UE supporting single registration needs to send a TAU request to the 4G base station and MME first. For satellite access (including transparent transmission and base station satellite architecture) (i.e. access to the IoT NTN network), steps 2 to 3 result in a waste of satellite-ground interaction resources and interaction delay.

[0026] In order to solve the problems existing in the related art, the embodiment of the present application provides a user terminal switching method, which can be operated on Figure 1 In the computer terminal shown, the computer terminal is explained below.

[0027] The user terminal switching method embodiment provided in the embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 FIG. 1 shows a hardware structure block diagram of a computer terminal for implementing a user terminal switching method. Figure 1 As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data, and a transmission module 106 for communication functions connected via a wired and / or wireless network. In addition, it may also include: a display, a keyboard, a cursor control device, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the I / O interface), a network interface, and a BUS bus. Those skilled in the art can understand that Figure 1The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0028] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0029] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the user terminal switching method in the embodiment of the present application. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, realizing the above-mentioned user terminal switching method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0030] The transmission module 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the computer terminal 10. In one example, the transmission module 106 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission module 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0031] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0032] It should be noted that, in some optional embodiments, the above Figure 1The computer terminal shown may include hardware elements (including circuits), software elements (including computer code stored on a computer-readable medium), or a combination of hardware elements and software elements. It should be noted that Figure 1 This is merely one example of a particular embodiment and is intended to illustrate the types of components that may be present in the computer terminal described above.

[0033] In the above-mentioned operating environment, an embodiment of the present application provides an embodiment of a user terminal switching method. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 2 is a flow chart of a user terminal switching method according to an embodiment of the present application, such as Figure 2 As shown, the method comprises the following steps:

[0035] Step S202, obtaining the signal strength of the user terminal, wherein the user terminal has been registered with the 5G core network;

[0036] Step S204, when the signal strength of the user terminal is lower than the first preset strength, directly sending an attachment request to the Internet of Things non-terrestrial network core network;

[0037] In step S204, sending an attachment request directly to the IoT non-terrestrial network core network means that the user terminal does not need to send a TAU request to the 4G base station and MME first, and directly sends an attachment request to the IoT non-terrestrial network core network when switching.

[0038] Step S206, receiving an attachment acceptance message sent by the IoT non-terrestrial network core network, and switching from the 5G core network to the IoT non-terrestrial network core network.

[0039] Through the above steps S202 to S206, by obtaining the signal strength of the user terminal, wherein the user terminal has been registered with the 5G core network; when the signal strength of the user terminal is lower than the first preset strength, directly sending an attachment request to the IoT non-terrestrial network core network; receiving the attachment acceptance message sent by the IoT non-terrestrial network core network, the 5G core network is switched to the IoT non-terrestrial network core network, thereby achieving the purpose of avoiding the user terminal from initiating a TAU process that is rejected first and then initiating an attachment request, thereby achieving the technical effect of reducing the switching delay, and further solving the technical problem of the long switching delay of the user terminal in the non-terrestrial network scenario in the related technology. The following is a detailed description.

[0040] In step S204, the process of directly sending an attachment request to the core network of the non-terrestrial network of the Internet of Things is as follows: detecting the signal strength of the non-terrestrial network of the Internet of Things, and when the signal strength of the non-terrestrial network of the Internet of Things is higher than a second preset strength, obtaining the configuration information of the user terminal; when the configuration information of the user terminal meets the preset conditions, sending an attachment request to the core network of the non-terrestrial network of the Internet of Things.

[0041] Wherein, when the configuration information of the user terminal indicates that the user terminal is a satellite access terminal and the user terminal is in a single registration mode, it is determined that the configuration information meets the preset condition.

[0042] When it is determined that the configuration information of the user terminal meets the preset conditions, the attachment request message is generated, and the attachment request message includes at least: the identity information of the user terminal and the type of the user terminal, wherein the type of the user terminal is a satellite access terminal; the attachment request message is sent to the Internet of Things non-terrestrial network core network.

[0043] The UE registered with the 5G network can access the satellite IoT NTN network with better signal based on signal measurement and base station broadcast decision. If the UE confirms satellite access based on the above content and is in single registration mode, it will directly send an attachment request to the IoT NTN EPC network. The UE accessing the IoT NTN satellite network does not need to perform the TAU process to the IoT NTN base station and IoT NTNMME via satellite, but directly sends the attachment process to the IoT NTN EPC, saving the switching process from the ground network to the satellite network, saving satellite resources, and reducing the overall delay of signaling interaction.

[0044] In some embodiments of the present application, an attachment acceptance message sent by the Internet of Things non-terrestrial network core network is received, wherein the attachment acceptance message is sent to the user terminal after the Internet of Things non-terrestrial network core network determines that the user terminal is in single registration mode and the user terminal is a satellite access terminal.

[0045] It should be noted that before receiving the attachment acceptance message sent by the IoT non-terrestrial network core network, the user terminal also needs to send a session release request to the 5G core network, and the session release request is used to release the protocol data unit session between the user terminal and the 5G core network. Then, a session release confirmation message sent by the 5G core network is received, and the session release confirmation message is used to indicate that the protocol data unit session between the user terminal and the 5G core network has been released.

[0046] Figure 3 Another user terminal switching method is shown, such as Figure 3As shown, it includes: step 0, UE registers to 5GC; step 1, UE establishes PDU session; step 2, UE decides to access satellite network based on signal strategy / base station broadcast. At this time, UE has accessed to ground 5GC based on its own single registration mode and has not registered with IoT NTN EPC, so it decides that there is no need to perform TAU process; step 3, attach to EPC (i.e. IoT NTN network) and release 5GC session according to existing technology.

[0047] It should be noted that the UE does not need to initiate a TAU and initiate EPC registration after being rejected by the network.

[0048] It can be understood that the steps for UE to register with 5GC include: Initial Registration Request: When the UE attempts to access the 5G network for the first time or re-registers after not interacting with the network for a long time, the UE will send an initial registration request (Registration Request) to the gNodeB of the RAN (Radio Access Network). The request contains the identity information of the UE, usually a temporary identity identifier, such as 5G-GUTI. RAN processing and transmission: After receiving the registration request, the gNodeB will forward the request to the AMF (Access and Mobility Management Function) through the N2 interface. AMF is a key component in 5GC and is responsible for handling the access and mobility management of the UE. AMF authentication and security: AMF verifies the identity of the UE, which usually includes UE authentication through the authentication server function (AUSF) and establishing a security association with the UE. After successful authentication, AMF will establish an encrypted secure channel with the UE. UE context establishment: AMF will create or update UE context information, including UE location information, network access control information, mobility management status, etc. Network slice selection: The UE may specify the required service type in the registration request, and the AMF will select the appropriate network slice based on this information. SMF selection and PDU session establishment: If the UE needs to establish or update a PDU Session (i.e., data connection), the AMF will select an SMF (session management function) to handle the PDU Session establishment request. The SMF will negotiate session parameters with the UE, including QoS (quality of service), data network name (DNN), etc., and establish a data path with the UPF (user plane function). Registration request processing result: After the AMF processes the registration request, it will send a Registration Accept message to the UE through the gNodeB to confirm that the UE has successfully registered with the network. The message may contain a new 5G-GUTI, as well as parameters configured on the network side, such as TAC (tracking area code), etc. UE response: After receiving the registration accept message, the UE will send a confirmation to the network to complete the registration process. At this point, the UE is considered to have successfully registered with the 5GC and can start using the data and services provided by the network.

[0049] The steps of UE initiating a PDU session establishment request include: UE initiates a PDU session establishment request to the network, which usually occurs when the UE needs to access a specific data network service. The request contains parameters such as DNN (Data Network Name) and S-NSSAI (Single-NAS Slice Selection Assistance Information) to identify the data network and network slice for which the session establishment is requested. AMF processing: After receiving the request from the UE, the RAN (Radio Access Network) forwards the request to the AMF (Access and Mobility Management Function) through the N2 interface. The AMF is responsible for processing the UE's registration request and mobility management, but during the PDU session establishment process, it is mainly responsible for forwarding the request to the appropriate SMF (Session Management Function). SMF receives and processes the PDU session establishment request: When the SMF receives the PDU session establishment request from the AMF, it selects the appropriate data network and network slice based on the DNN and S-NSSAI parameters in the request. The SMF may also need to interact with other core network functional entities such as UDM (Unified Data Management) to obtain the UE's subscription information. SMF negotiates session parameters with UE: SMF sends a PDU Session Establishment Accept message to UE, which contains session parameters such as PDU session ID, QoS (Quality of Service) rules, charging characteristics, UPF (User Plane Function) information, etc. UE must confirm these parameters. UPF selection and configuration: SMF selects or assigns a UPF to establish the data plane path of the PDU session. UPF is responsible for data packet forwarding and policy execution. SMF notifies UPF of information about UE and PDU session, including IP address allocation, QoS policy and charging rules. Establishing data plane connection: After parameter negotiation and UPF configuration are completed, a data plane connection between UE and UPF is established through the N3 interface (interface between RAN and UPF). UE will obtain an IP address for subsequent data communication. UE confirms PDU session establishment: After receiving the PDU Session Establishment Accept message, UE sends a PDU Session Establishment Complete message to SMF to confirm that the session is successfully established. The core network completes the PDU session establishment: Finally, SMF will notify AMF and RAN that the session establishment is complete, AMF will then notify RAN, and RAN will inform UE to confirm that the entire PDU session establishment process has been completed.

[0050] Figure 4 A user terminal switching device according to an embodiment of the present application includes:

[0051] An acquisition module 40 is configured to acquire a signal strength of a user terminal, wherein the user terminal has been registered with a 5G core network;

[0052] A sending module 42, configured to directly send an attachment request to the Internet of Things non-terrestrial network core network when the signal strength of the user terminal is lower than a first preset strength;

[0053] The receiving module 44 is used to receive the attachment acceptance message sent by the Internet of Things non-terrestrial network core network, and switch from the 5G core network to the Internet of Things non-terrestrial network core network.

[0054] Through the above-mentioned user terminal switching device, by obtaining the signal strength of the user terminal, wherein the user terminal has been registered with the 5G core network; when the signal strength of the user terminal is lower than the first preset strength, directly sending an attachment request to the Internet of Things non-terrestrial network core network; receiving the attachment acceptance message sent by the Internet of Things non-terrestrial network core network, switching from the 5G core network to the Internet of Things non-terrestrial network core network, thereby achieving the purpose of avoiding the user terminal initiating a TAU process first and then initiating an attachment request after being rejected, thereby achieving the technical effect of reducing the switching delay, and further solving the technical problem of the long switching delay of the user terminal in the non-terrestrial network scenario in the related technology.

[0055] The sending module 42 includes a first sending submodule, which is used to send an attachment request directly to the Internet of Things non-terrestrial network core network, including: detecting the signal strength of the Internet of Things non-terrestrial network, and when the signal strength of the Internet of Things non-terrestrial network is higher than a second preset strength, obtaining the configuration information of the user terminal; when the configuration information of the user terminal meets the preset conditions, sending an attachment request to the Internet of Things non-terrestrial network core network.

[0056] The sending submodule includes: a determining unit, which is used to determine that the configuration information meets the preset condition when the configuration information of the user terminal indicates that the user terminal is a satellite access terminal and the user terminal is in a single registration mode.

[0057] The sending module 42 also includes a second sending submodule, which is used to send an attachment request to the non-terrestrial network core network of the Internet of Things, including: generating the attachment request message, the attachment request message including at least: the identity information of the user terminal and the type of the user terminal, wherein the type of the user terminal is a satellite access terminal; sending the attachment request message to the non-terrestrial network core network of the Internet of Things.

[0058] The receiving module 44 includes: a receiving submodule and a releasing submodule, wherein the receiving submodule is used to receive an attachment acceptance message sent by the Internet of Things non-terrestrial network core network, wherein the attachment acceptance message is sent to the user terminal after the Internet of Things non-terrestrial network core network determines that the user terminal is in a single registration mode and the user terminal is a satellite access terminal.

[0059] The release submodule sends a session release request to the 5G core network before receiving the attachment acceptance message sent by the IoT non-terrestrial network core network, wherein the session release request is used to release the protocol data unit session between the user terminal and the 5G core network.

[0060] The release submodule includes: a release unit, used to receive a session release confirmation message sent by the 5G core network, and the session release confirmation message is used to indicate that the protocol data unit session between the user terminal and the 5G core network has been released.

[0061] It should be noted that Figure 4 The user terminal switching device shown is used to perform Figure 2 The user terminal switching method shown, therefore the relevant explanations in the above user terminal switching method are also applicable to the user terminal switching device, and will not be repeated here.

[0062] An embodiment of the present application also provides a communication device, including: a memory and a processor, wherein the memory is used to store program instructions; the processor is connected to the memory and is used to execute the above-mentioned user terminal switching method.

[0063] An embodiment of the present application further provides a non-volatile storage medium, which includes a stored computer program, wherein the device where the non-volatile storage medium is located executes the above-mentioned user terminal switching method by running the computer program.

[0064] An embodiment of the present application also provides a communication system, including computer instructions, which, when executed by a processor, implement the steps of the user terminal switching method in the present application.

[0065] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0066] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0067] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0068] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0069] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0070] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a communication device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0071] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A user terminal switching method, characterized in that: include: Obtaining a signal strength of a user terminal, wherein the user terminal has been registered with a 5G core network; When the signal strength of the user terminal is lower than a first preset strength, directly sending an attachment request to the Internet of Things non-terrestrial network core network; Receive an attachment acceptance message sent by the IoT non-terrestrial network core network, and switch from the 5G core network to the IoT non-terrestrial network core network.

2. The method according to claim 1, characterized in that Sending an attachment request directly to the IoT non-terrestrial network core network includes: Detecting the signal strength of the Internet of Things non-terrestrial network, and acquiring the configuration information of the user terminal when the signal strength of the Internet of Things non-terrestrial network is higher than a second preset strength; When the configuration information of the user terminal meets the preset conditions, an attachment request is sent to the Internet of Things non-terrestrial network core network.

3. The method according to claim 2, characterized in that The method further comprises: In a case where the configuration information of the user terminal indicates that the user terminal is a satellite access terminal and the user terminal is in a single registration mode, it is determined that the configuration information meets the preset condition.

4. The method according to claim 1, characterized in that: Send an attachment request to the IoT non-terrestrial network core network, including: generating the attachment request message, wherein the attachment request message includes at least: identity information of the user terminal and the type of the user terminal, wherein the type of the user terminal is a satellite access terminal; Send the attachment request message to the Internet of Things non-terrestrial network core network.

5. The method according to claim 1, characterized in that The method further comprises: Receive an attachment acceptance message sent by the Internet of Things non-terrestrial network core network, wherein the attachment acceptance message is sent to the user terminal after the Internet of Things non-terrestrial network core network determines that the user terminal is in single registration mode and the user terminal is a satellite access terminal.

6. The method according to claim 1, characterized in that Before receiving the attachment acceptance message sent by the Internet of Things non-terrestrial network core network, the method further includes: Send a session release request to the 5G core network, where the session release request is used to release the protocol data unit session between the user terminal and the 5G core network.

7. The method according to claim 6, characterized in that The method further comprises: Receive a session release confirmation message sent by the 5G core network, where the session release confirmation message is used to indicate that the protocol data unit session between the user terminal and the 5G core network has been released.

8. A user terminal switching device, characterized in that: include: An acquisition module is used to acquire a signal strength of a user terminal, wherein the user terminal has been registered with a 5G core network; A sending module, configured to directly send an attachment request to the Internet of Things non-terrestrial network core network when the signal strength of the user terminal is lower than a first preset strength; The receiving module is used to receive the attachment acceptance message sent by the non-terrestrial network core network of the Internet of Things, and switch from the 5G core network to the non-terrestrial network core network of the Internet of Things.

9. A communication device, characterized in that: include: A memory and a processor, wherein the memory is used to store program instructions; The processor is connected to the memory and is used to execute the user terminal switching method described in any one of claims 1 to 7.

10. A communication system comprising computer instructions, characterized in that When the computer instructions are executed by the processor, the user terminal switching method described in any one of claims 1 to 7 is implemented.

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