Data interaction method and device, electronic equipment and nonvolatile storage medium

Abstract

The invention discloses a data interaction method and device, electronic equipment and a nonvolatile storage medium. The method comprises: an access and mobility management function (AMF) entity receiving a network switching request message of a next generation radio access network (NG-RAN), the network switching request message being used for indicating a user equipment (UE) to switch from a 5G network to a 4G network; the AMF entity determines a target mobility management (MME) entity, the target MME entity being an MME entity in the 4G network area to which the target MME entity is switched; and the AMF entity sends a relocation request to the target MME entity, and requests the target MME entity to establish a new connection for the UE in the 4G network. According to the method and the device, the technical problems of low switching efficiency and poor user experience caused by the fact that more interaction steps need to be carried out for switching from the 5G network to the 4G network between the AMF entity and the target MME entity are solved.

Description

Technical Field

[0001] The present application relates to the field of satellite communications, and more specifically, to a method, device, electronic device and non-volatile storage medium for data interaction. Background Art

[0002] There is integration between the 5G communication system and the 4G communication system, that is, the network architecture of the 5G communication system and the 4G communication system are integrated, and the transmission method and transmission protocol of the physical layer are also integrated. The 5G communication system and the 4G communication system are integrated into a satellite-ground integrated network, which can provide users with high-quality communication services.

[0003] The access and mobility management function (AMF) entity and the mobility management entity (MME) need to go through many interactive steps to switch from 5G network to 4G network in the satellite-ground integrated network. During the switching process of user equipment UE from 5G network to 4G network, it may be necessary to allocate resources between 5G core network and 4G core network, and quickly switch between allocated resources. In the switching process of related technologies, the switching of user equipment UE from 5G network to 4G network between AMF and MME requires many signaling interaction steps, and the network resource allocation and switching resource allocation time are long, which will increase the network resource waiting time during the switching process, and ultimately affect the network connection performance, low switching efficiency, and reduced user experience.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a method, device, electronic device and non-volatile storage medium for data interaction, so as to at least solve the technical problem that switching from 5G network to 4G network between AMF entity and target MME entity requires many interaction steps, resulting in low switching efficiency and poor user experience.

[0006] According to one aspect of an embodiment of the present application, a method for data interaction is provided, including: an access and mobility management function AMF entity receives a network switching request message of a next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; the AMF entity determines a target mobility management MME entity, wherein the target MME entity is an MME entity in a 4G network area to be switched to; the AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0007] In some embodiments of the present application, after the AMF entity sends a relocation request to the target MME entity, the method also includes: the AMF entity receives a response message sent by the target MME entity, wherein the response message is a response message of the relocation request; after receiving the response message, the AMF entity sends a session context request to the session management function SMF entity / packet data network gateway control plane PGW-C entity, and the session context request includes tunnel information on the service gateway SGW core network side obtained from the evolved universal terrestrial radio access network E-UTRAN and bearer information of the evolved packet system EPS.

[0008] In some embodiments of the present application, after the AMF entity sends a session context request to the session management function SMF entity / packet data network gateway control plane PGW-C entity, the method also includes: when the 5G core network does not establish a 5G bearer for the UE, instructing the user plane function UPF entity / user plane PGW-U entity of the packet data network gateway to allocate tunnel information through the SMF entity / PGW-C entity, wherein the tunnel information is the tunnel information used by the user plane function during data transmission.

[0009] In some embodiments of the present application, the SMF entity and the user plane function UPF entity are core network elements for allocating tunnel information in the 5G network, and the PGW-C entity and the PGW-U entity are core network elements for allocating tunnel information in the 4G network.

[0010] In some embodiments of the present application, after allocating tunnel information, the method also includes: the AMF entity receives a notification message sent by the target MME entity, wherein the notification message is used to notify the AMF entity that the switch from the 5G network to the 4G network is completed, and the notification message includes tunnel information after mapping from the 5G network to the 4G network.

[0011] In some embodiments of the present application, the AMF entity determines the target MME entity based on network load, geographic location or service quality parameters.

[0012] In another aspect of an embodiment of the present application, a method for data interaction is also provided, including: a target mobility management entity MME entity receives a relocation request sent by an access and mobility management function AMF entity; the target MME entity sends a create session request to a service gateway SGW, wherein the create session request does not carry tunnel information used by the user plane function during data transmission.

[0013] In some embodiments of the present application, the MME entity receives a network switching request message sent by an evolved universal terrestrial radio access network E-UTRAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; the MME entity sends a relocation completion notification to an AMF entity and an SGW, wherein the relocation completion notification includes tunnel information after mapping from the 5G network to the 4G network, wherein the tunnel information is tunnel information used by the user plane function during data transmission.

[0014] In another aspect of an embodiment of the present application, a data interaction device is also provided, including: a receiving module, used for an access and mobility management function AMF entity to receive a network switching request message of a next-generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; a determination module, used for the AMF entity to determine a target mobility management MME entity, wherein the target MME entity is an MME entity in a 4G network area to be switched to; a sending module, used for the AMF entity to send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0015] On the other hand, a data interaction system is provided, including: an access and mobility management function AMF entity and a target mobility management entity MME entity; the AMF entity is used to receive a network switching request message of a next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network, determine a target MME entity, wherein the target MME entity is an MME entity in a 4G network area to be switched to, and send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network; the target mobility management entity MME entity is used to receive a relocation request sent by the access and mobility management function AMF entity, and send a create session request to a service gateway SGW, wherein the create session request does not carry tunnel information used by the user plane function during data transmission.

[0016] In another aspect of an embodiment of the present application, a non-volatile storage medium is provided, in which a program is stored, wherein when the program is running, a device where the non-volatile storage medium is located is controlled to execute the above data interaction method.

[0017] In another aspect of an embodiment of the present application, an electronic device includes: a memory and a processor, the processor being configured to run a program stored in the memory, wherein the above data interaction method is executed when the program is run.

[0018] In an embodiment of the present application, an access and mobility management function AMF entity is used to receive a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; the AMF entity determines a target mobility management MME entity, wherein the target MME entity is an MME entity in the 4G network area to be switched; the AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network, and by simplifying the interaction steps between the AMF entity and the target MME entity, the technical problem that the switching from a 5G network to a 4G network between the AMF entity and the target MME entity requires many interaction steps, resulting in low switching efficiency and poor user experience is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 It is a hardware structure block diagram of a computer terminal for implementing a method for data interaction provided in an embodiment of the present application;

[0021] Figure 2 It is a flowchart of a data interaction method provided according to an embodiment of the present application;

[0022] Figure 3 is a flowchart of another data interaction method provided according to an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of a process for a user equipment UE to switch from a 5G network to a 4G network according to an embodiment of the present application;

[0024] Figure 5It is a schematic diagram of a process of switching a 5G network to a 4G network by an improved user equipment UE provided in an embodiment of the present application;

[0025] Figure 6 is a structural diagram of a data interaction system provided according to an embodiment of the present application;

[0026] Figure 7 It is a structural diagram of a data interaction device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] In order to better understand the embodiments of the present application, the technical terms involved in the embodiments of the present application are explained as follows:

[0030] Mobility Management Entity (MME): Mainly responsible for mobility management, including tracking of user location, paging and control of handover processes. In the interoperation between 5G network (5GS) and 4G network (EPS), MME is a key network element on the 4G side, responsible for interacting with the AMF entity (Access and Mobility Management Function) in the 5G core network (5GC) to ensure the continuity and service quality of users when switching between different networks. In the optimization method of switching from 5GS to EPS in the satellite-ground fusion network, the enhanced functions of MME play an important role in reducing the number of network interactions and improving handover efficiency.

[0031] Next Generation Radio Access Network (NG-RAN): It is part of the 5G network architecture and includes 5G base stations and enhanced evolved base stations, which are connected to the 5G core network (5GC) through the NG interface. The main features of NG-RAN are support for higher data rates, lower latency, greater connection density, and more flexible network deployment and management.

[0032] Session Management Function (SMF): It is one of the key network functions in the 5G core network (5GC) and is responsible for handling tasks related to session management. SMF is responsible for establishing, modifying, and releasing protocol data unit (PDU) sessions between user equipment (UE) and data network (DN). It manages session states, including session policies and charging rules; SMF selects user plane functions to handle UE traffic and determines the forwarding path for data packets. In multi-access and mobility scenarios, SMF is responsible for switching and optimizing user plane paths. Based on policies and charging rules, SMF controls the behavior of UPF to ensure that traffic follows the correct policies and charging settings.

[0033] Evolved Packet System (EPS): It is the core network part of the 4G network. EPS is mainly composed of EPC (Evolved Packet Core), including MME, Serving Gateway (SGW), Packet Data Network Gateway (PGW) and other components, which are used to provide data transmission, mobility management, session management and other functions. In the satellite-ground fusion network, EPS, as the core part of the 4G network, interacts with 5GS (5G System) to realize switching and data transmission between different networks.

[0034] Packet Data Network Gateway Control plane (PGW-C): Responsible for control plane processing, including user and session management, such as the establishment, modification and release of EPS bearers. In the scenario of switching from 5G to 4G, the role of PGW-C mainly involves the management of EPS bearer contexts and interacting with AMF and SMF in the 5G core network (5GC) to ensure the continuity of user sessions.

[0035] Serving Gateway (SGW): It is part of the Evolved Packet Core (EPC) in the Long Term Evolution (LTE) network, and is mainly responsible for routing and forwarding data packets between the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and the Evolved Packet System (EPS) bearer network. In handover and mobility management, SGW is also responsible for the management of user plane sessions, including establishing, modifying and releasing user plane tunnels to ensure the continuity of data flows.

[0036] Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is the radio access network part of the LTE (Long Term Evolution) system. It is the air interface defined by 3GPP (3rd Generation Partnership Project) to improve the existing UMTS (Universal Mobile Telecommunication System) network. E-UTRAN consists of eNodeB (evolved Node B), which are connected to each other through the X2 interface, and the connection between eNodeB and EPS is completed through the S1 interface. In E-UTRAN, radio resource management and control functions are centralized in eNodeB, which helps to simplify the network architecture, reduce latency, and improve spectrum efficiency.

[0037] Access and Mobility Management Function (AMF): A key component in the 5G core network, responsible for handling access and mobility events, including user equipment (UE) registration, connection establishment, mobility management (such as switching and reselection), and session management between UE and the network. In the satellite-ground converged network, AMF plays the role of a bridge, coordinating between the 5G system (5GS) and the 4G system (EPS) to ensure smooth switching of UE between different networks to provide uninterrupted communication services.

[0038] Packet Data Network Gateway-User Plane (PGW-U): In the 5G network architecture, it corresponds to a functional embodiment of the user plane function UPF (User Plane Function), but in the 4G network architecture, it is a part of PGW (Packet Data Gateway), which specializes in handling the forwarding of user plane data. In the 5G network, UPF is responsible for processing and forwarding data from the non-access stratum (NAS), including the routing and forwarding of data packets, the inspection of data packets, the implementation of QoS (Quality of Service) policies, and the collection of billing data. In the scenario of 5GS switching to EPS in the satellite-ground fusion network, PGW-U / UPF is responsible for establishing a user plane tunnel between the 5G system (5GS) and EPS to ensure that data packets can be seamlessly forwarded from the 5G network to the 4G network, and vice versa. This function is crucial to ensuring continuity and service quality during the switching process, especially in the satellite communication scenario, because of the delay and bandwidth limitations of the satellite link, efficient and stable user plane data transmission is the key to maintaining network performance.

[0039] In the related art, during the switching process of user equipment UE from 5G network to 4G network, it may be necessary to allocate resources between 5G core network and 4G core network, quickly switch between allocated resources, etc. In the switching process in the related art, the switching of user equipment UE from 5G network to 4G network between AMF and MME requires more signaling interaction steps, and the network resource allocation and switching resource allocation time are long, which will increase the network resource waiting time during the switching process, and ultimately affect the network connection performance, low switching efficiency, and reduce user experience. Therefore, there is a problem that the switching from 5G network to 4G network between AMF entity and target MME entity requires more interaction steps, resulting in low switching efficiency and poor user experience. In order to solve this problem, a relevant solution is provided in the embodiment of the present application, which is described in detail below.

[0040] According to an embodiment of the present application, an embodiment of a method for data interaction is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a 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.

[0041] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1FIG. 1 shows a hardware structure block diagram of a computer terminal for implementing a method for data interaction. Figure 1 As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors 102 (the processor 102 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. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The 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 shown.

[0042] It should be noted that the one or more processors 102 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).

[0043] The memory 104 can be used to store software programs and modules of application software, such as program instructions / data storage devices corresponding to the data interaction method in the embodiment of the present application. The processor 102 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 data interaction 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 examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, 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.

[0044] The transmission device 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 device 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 device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0045] 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 .

[0046] In the above operating environment, the present application embodiment provides a flow chart of a method for data interaction, such as Figure 2 As shown, the method comprises the following steps:

[0047] Step S202: The access and mobility management function AMF entity receives a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network.

[0048] The following is a specific embodiment:

[0049] The AMF entity receives a network handover request message from the source NG-RAN (i.e., the NG-RAN mentioned above). The source NG-RAN refers to the wireless access network to which the mobile device (such as a mobile phone, IoT device, etc.) is currently connected in the 5G network. The source NG-RAN decides to trigger a handover to the EPS (Evolved Packet System, i.e., the 4G network) and sends a handover request message to the AMF entity. This is the starting point of the handover process. The handover request message may include the following: UE identification information (e.g., 5G-GUTI (Global Unique Temporary Identifier) ​​or S-TMSI (Short Term Mobility Subscriber Identity), which is used to uniquely identify the UE; Handover type (Handover type): clearly indicates that this is a handover from 5G to 4G so that the AMF entity can perform subsequent processing; Handover reason: the handover may be triggered due to UE mobility, network load balancing, changes in quality of service (QoS) requirements, etc.; Target RAN information: includes the type of target RAN (e.g., EPS or 5GS) and identifier, such as the target eNB (Evolved Node B, 4G base station) or gNB (5G base station) ID, and possible N26 interface information, for subsequent core network node selection; UE capability information: such as supported handover types, whether to support N26 interface, etc., to help network decision-making. Quality of service (QoS) requirements: ensure that the network can provide service quality that meets UE requirements.

[0050] Step S204, the AMF entity determines the target mobility management MME entity, wherein the target MME entity is the MME entity in the 4G network area to be switched.

[0051] In the technical solution provided in step S204, the AMF entity determines the target MME entity based on network load, geographic location or service quality parameters.

[0052] The following is a specific embodiment:

[0053] Network Load: The AMF entity can monitor the load of the entire network, including the load status of each MME (i.e. the MME entity mentioned above). The AMF entity will analyze the MME load in the target area and select an MME with relatively low load to avoid switching to an already busy MME, thereby reducing the risk of potential switching failure or service quality degradation.

[0054] Geographical Location: The AMF entity will consider the location information of the UE and the geographical area covered by the target MME, and select the MME that is geographically closest to the UE location, which can reduce transmission delay and improve switching efficiency. It will also refer to the coverage of the satellite network to ensure that the UE still maintains a good satellite signal after switching.

[0055] Quality of Service (QoS): The AMF entity (i.e. the above-mentioned AMF entity) will evaluate the quality of service that the target MME can provide, including parameters such as bandwidth and latency. For UEs with high priority or special needs (such as emergency services, high-definition video streaming, etc.), the AMF entity may give priority to MMEs that can meet these QoS requirements. In a satellite-ground fusion network, the quality of service parameters may also consider the stability of the satellite link and the ability of the ground network to work together with the satellite network.

[0056] Implementation steps:

[0057] When the AMF entity receives the Network Handover Request message from the source NG-RAN, it evaluates the target MME based on the above parameters:

[0058] The AMF entity will query or obtain the load and location information of the target MME, as well as its QoS capabilities from other network functions (such as NRF, Network Repository Function). Based on this information, the AMF entity selects an MME whose load, distance from the UE location, and QoS capabilities are greater than the preset threshold as the target MME.

[0059] The AMF entity first selects the target MME entity instead of sending a session context request (e.g., Nsmf_PDUSessionContext request) to the SMF. The Nsmf_PDUSessionContext request is used to request or update session context information related to the user equipment (UE), including but not limited to tunnel information, QoS parameters, billing information, etc. In the 5G to 4G handover process, this request is used to ensure that the data path of the user plane is correctly established and maintained between different networks.

[0060] The following is a specific embodiment:

[0061] The AMF entity sends a relocation request to the target MME (i.e., the target MME entity mentioned above). The relocation request is a key step, which involves coordination between network nodes to ensure service continuity. When the AMF entity receives the switching request sent by NG-RAN, indicating that the UE (user equipment) is about to switch from the 5G network to the 4G network, it then sends a relocation request to the target MME. The AMF entity informs the target MME entity of the UE's location information and switching requirements through the relocation request message, so that the target MME entity can be selected to be responsible for the subsequent connection management of the UE in the EPS network. The UE information and required EPS bearer requirements contained in the relocation request enable the MME entity to prepare for the establishment of EPS bearers in advance, ensuring that the UE can seamlessly continue its data service when switching to the EPS network. The message triggers the reservation and allocation of resources in the EPS network, including but not limited to establishing a tunnel from the SGW to the PGW-U / UPF entity to prepare for the UE's data transmission in the EPS network.

[0062] In step S206, the AMF entity sends a relocation request to the target MME entity, where the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0063] In the technical solution provided in step S206, after the AMF entity sends a relocation request to the target MME entity, the AMF entity receives a response message sent by the target MME entity, wherein the response message is a response message to the relocation request.

[0064] In the response message of the relocation request message, the MME will provide the user plane configuration information used by the UE in the EPS network (such as the tunnel information of the SGW and PGW), which helps to establish the uplink and downlink data paths from the UE to the EPS network. Through the relocation request and its subsequent response, the service continuity of the UE during the switching process can be ensured, the service interruption time can be reduced, and the efficiency of network switching and user experience can be improved. In the satellite-ground integrated network, this optimization is particularly important because it can reduce the signaling interaction between the satellite and the ground network, reduce network latency, and improve the success rate of switching.

[0065] In the technical solution provided in step S206, after receiving the response message, the AMF entity sends a session context request to the session management function SMF / packet data network gateway control plane PGW-C entity, and the session context request includes the tunnel information of the service gateway SGW core network side obtained from the evolved universal terrestrial radio access network E-UTRAN and the bearer information of the evolved packet system EPS.

[0066] After the AMF entity sends a session context request to the session management function SMF / packet data network gateway control plane PGW-C entity, when the 5G core network has not established a 5G bearer for the UE, the SMF / PGW-C entity instructs the UPF entity / PGW-U to allocate tunnel information, where the tunnel information is the tunnel information used by the user plane function during data transmission. The SMF and user plane function UPF entities are the core network elements that allocate tunnel information in the 5G network, and the PGW-C entity and PGW-U are the core network elements that allocate tunnel information in the 4G network.

[0067] The following is a specific embodiment:

[0068] After receiving the response message, the AMF entity sends a session context request (for example, Nsmf_PDUSessionContext request) to the session management function SMF / packet data network gateway control plane PGW-C entity. The session context request includes the tunnel information of the service gateway SGW core network side obtained from the evolved universal terrestrial radio access network E-UTRAN and the bearer information of the evolved packet system EPS. EPS bearer information refers to the information used to describe the data transmission path and attributes in the 4G network system. In the EPS network architecture, the data transmission channel between each user equipment (UE) and the network is called a bearer. The EPS bearer is a logical connection established specifically for a specific data service between the UE and the network. It includes QoS parameters, bearer identifiers, and network tunnel information for data transmission. When the SMF entity receives the Nsmf_PDUSessionContext request sent from the MME entity, if the 5G bearer is not currently established (that is, when the 5G core network does not establish a 5G bearer for the UE as mentioned above), the PGW-C entity (equivalent to the SMF entity in the 5G network) instructs the PGW-U entity (equivalent to the UPF entity in the 5G network) to allocate tunnel information (for example, Tunnel info of the UPF entity). This tunnel information will be used to establish a user plane data path from the 5G network to the 4G network to ensure continuous data transmission. The SMF entity and the user plane function UPF entity are the core network elements for allocating tunnel information in the 5G network, and the PGW-C entity and the PGW-U entity are the core network elements for allocating tunnel information in the 4G network. This optimization reduces the interaction steps in the switching process, especially for high-latency scenarios such as satellite communications, which can significantly improve network switching efficiency.

[0069] The present application also provides a flowchart of another data interaction method, such as Figure 3 As shown, the method comprises the following steps:

[0070] Step S302: The target mobility management entity MME entity receives a relocation request sent by an access and mobility management function AMF entity.

[0071] Step S304: The target MME entity sends a session creation request to the serving gateway SGW, wherein the session creation request does not carry tunnel information used by the user plane function during data transmission.

[0072] In the technical solution provided in step S304, the MME entity receives a network switching request message sent by the evolved universal terrestrial radio access network E-UTRAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network.

[0073] When the MME entity receives the relocation request sent from the source AMF entity, it also sends a create session request to the SGW. The create session request is used to ensure that the network can provide continuous network services to the UE, but does not carry the tunnel information used by the user plane function during data transmission (for example, PGW-U entity tunnel info).

[0074] The purpose of sending a session creation request to the SGW without carrying the PGW-U entity tunnel info is to optimize and simplify the signaling interaction in the handover process, thereby improving network efficiency. In the traditional handover process, the PGW-U entity tunnel info is transmitted in multiple steps, and each transmission requires interaction between network nodes, which is particularly inefficient in high-latency environments such as satellite communications. By omitting the transmission of this information in the early stage, the MME entity can perform the session creation process more quickly, avoiding unnecessary tunnel information interaction when it is not yet certain whether to switch to EPS, thereby reducing the number of signaling interactions and handover delays. Specifically, not carrying the PGW-U entity tunnel info can avoid the complex tunnel establishment process in the early stage of the target MME selecting the SGW and establishing a connection with the E-UTRAN. The optimization of this step allows the network to establish the PGW-U entity tunnel in a more certain handover scenario, reducing unnecessary network resource consumption. Especially in the satellite-ground integrated network, due to the high latency characteristics of the satellite link, reducing the number of signaling interactions has a significant positive impact on improving the handover success rate and user experience. Finally, when the switching process advances to the point where a tunnel from the PGW-U entity to the SGW needs to be established, relevant information is exchanged, which ensures that each interaction is necessary, thereby achieving the purpose of optimizing the entire switching process.

[0075] After the UE successfully completes the handover in the target E-UTRAN cell, the MME entity sends a relocation completion notification to the AMF entity and SGW, where the relocation completion notification contains tunnel information (for example, PGW-U entity tunnel info after mapping from the 5G network to the 4G network), where the tunnel information is the tunnel information used by the user plane function during data transmission.

[0076] The following is a specific embodiment:

[0077] The MME entity sends a relocation completion notification (e.g., Relocation CompleteNotification) to the AMF entity and SGW, which is a message in the mobile communication network used to notify the AMF entity that the switching or relocation process has been completed. In the switching process between the 5G network and the 4G network, when the UE successfully connects to the target network (e.g., switching from 5GS to EPS) and completes all necessary network configurations, the control node of the target network (such as the target MME) will send a "Relocation Complete Notification" to the AMF entity, indicating that the UE has successfully switched to the target network and all context information (such as tunnel information) has been correctly set.

[0078] After the UE successfully switches, the target MME will not only notify the AMF entity of the completion of the switch, but also carry the necessary tunnel information (for example, the PGW-U entity tunnel info after mapping from the 5G network to the 4G network) for subsequent network signaling interaction and optimization of user plane data transmission.

[0079] The embodiment of the present application also provides a schematic diagram of a process for a user equipment UE to switch from a 5G network to a 4G network, such as Figure 4 As shown, N26 represents the mobility management interface between 5GS and EPS (N26 Interface for MobilityManagement between 5GS and EPS), N4 represents the interface between SMF entity and UPF entity (Interfacebetween SMF and UPF), and Nsmf_PDUSession_ContextRequest represents the SMF interface for requesting PDU session context information (SMF interface for requesting PDU session context information).

[0080] 1~2.NG-RAN decides to trigger a handover to EPS (i.e., switching from 5G network to 4G network) and sends a handover request message to the source AMF (i.e., the above-mentioned AMF entity).

[0081] 3~5. Based on the identifier of the target "RAN", the source AMF (i.e. the above-mentioned AMF entity) determines that it is a handover to the target E-UTRAN, and therefore requests PGW-C / SMF (i.e. the above-mentioned PGW-C / SMF entity) to provide the EPS connection information required by the target MME (i.e. the above-mentioned target MME entity). If the downlink data arriving at the RAN needs to be forwarded to the target E-UTRAN through PGW-U / UPF, it is necessary to obtain the tunnel information (UPF tunnel info) of its node from PGW-U / UPF in steps 4.1~4.2 and return it in step 5.

[0082] 4.1~4.2. In non-roaming or LBO roaming situations, when PGW-C / SMF receives the interface Nsmf_PDUSession_ContextRequest used by SMF to request PDU session context information, if PGW-C / SMF determines that EPS bearer information can be transmitted to EPS, and the tunnel information of the CN (core network side) of the EPS bearer has not been allocated to the UE before, PGW-C / SMF sends N4 session modification to PGW-U / UPF, establishes a CN tunnel for each EPS bearer, and provides EPS bearer information to the source AMF. At this time, PGW-U / UPF can receive uplink data packets from E-UTRAN.

[0083] 5. The source AMF receives the response of PDU session context information.

[0084] 6. The source AMF selects a target MME based on the target E-UTRAN information provided by the source NG-RAN.

[0085] 7-8.1. The source AMF sends the relocation request message to the target MME, and the target MME sends it to the SGW. According to the PGW-U entity tunnel info obtained in step 5, an EPS uplink user plane data path is established from the SGW to the PGW-U / UPF.

[0086] 8.2. The SGW returns a response to create a session to the target MME, carrying the tunnel information (tunnel info) allocated by the SGW to the E-UTRAN side (base station side).

[0087] 9.1. The target MME sends a handover request message to the target E-UTRAN, carrying the SGW base station side tunnel info in step 8.2, thereby establishing an EPS uplink user plane data path from the target E-UTRAN to the SGW.

[0088] 9.2. The target E-UTRAN returns a handover response message to the target MME, carrying the E-UTRAN tunnel info allocated by it.

[0089] 10.1-10.2. The target MME sends a request to the SGW to establish an indirect tunnel with the UPF, and carries the E-UTRAN tunnel info in step 9.2. At this point, the downlink indirect forwarding path from the SGW to the target E-UTRAN is established.

[0090] 10.2 Return the response information of step 10.1 and carry the SGW CN side tunnel info between SGW and PGW-U / UPF.

[0091] 11. The target MME sends a relocation response message to the source AMF.

[0092] 12. The source AMF sends an Nsmf_PDUSessionContext request to the SMF and carries the SGW CN side tunnel info obtained in step 10.2 above.

[0093] 13.1.SMF sends an N4 session modification request to PGW-U / UPF and informs PGW-U / UPF of the tunnel info on the SGW CN side to establish a downlink forwarding tunnel from PGW-U / UPF to SGW.

[0094] 13.2~14 return response information.

[0095] 15~17 The source NG-RAN sends a handover command to the UE, and the UE then connects to the target cell.

[0096] 18. The target E-UTRAN sends a handover Notify to the target MME, whereby the target E-UTRAN considers the handover successful.

[0097] 19.1~19.2 The target MME notifies the source AMF that the handover is complete.

[0098] 20~23.MME also provides E-UTRAN tunnel information to SGW and PGW-C / SMF to establish a downlink data path and switch the downlink user plane path to the target E-UTRAN access network.

[0099] 24~26. Finally, the UE starts the tracking area update process (the same as the S1-based switching process). The S1 interface refers to the interface between the evolved UTRAN (E-UTRAN) and the evolved packet core (EPC) in the 4G LTE network. Specifically, it is the interface connecting the eNodeB (base station) with the MME (mobility management entity) and the S-GW (serving gateway). The S1 interface is divided into two parts: the control plane (S1-MME) and the user plane (S1-U). S1-MME is used for signaling interaction on the control plane, and S1-U is used for data transmission on the user plane. In the interoperability between 5G networks and 4G networks, the S1 interface still plays an important role in the 4G network part.

[0100] If there is a request for establishing a dedicated bearer in the handover process, PGW-C / SMF also triggers the establishment of a dedicated bearer. The network also releases the indirect forwarding tunnel that is no longer needed.

[0101] The embodiment of the present application also provides a schematic diagram of an improved process of user equipment UE switching from a 5G network to a 4G network, such as Figure 5 As shown, it is Figure 4 A schematic diagram of a switching process of a 5G network switching to a 4G network after an improved switching process is performed by applying an embodiment of the present method.

[0102] 1~2. Same Figure 4 1-2, then the AMF entity first performs step 6 to select the target MME entity, and no longer performs Figure 4 In 3-5, the AMF entity first selects the target MME entity instead of sending a session context request (e.g., Nsmf_PDUSessionContext request) to the SMF. This optimization avoids unnecessary signaling interactions before the target MME is determined. Figure 4In the traditional process, AMF first sends a session context request to SMF, and then selects and relocates MME. The optimized process in the embodiment of the present application directly selects MME, which reduces the number of interactions with the core network (5GS) when the target network (EPS) has not been determined, thereby reducing signaling redundancy and improving network efficiency; in high-latency environments such as satellite communications or network-intensive interaction scenarios, reducing one signaling interaction means reducing network latency. Faster target MME selection can directly accelerate subsequent signaling processes, including requests for EPS bearer information, tunnel establishment, etc., thereby improving the overall switching speed of UE (User Equipment) from the 5GS network to the EPS network; delaying the sending of a session context request to SMF until the target MME is determined can avoid wasting resources on unnecessary MME entities. For example, when the target MME has not yet been determined, premature processing in the SMF may lead to ineffective allocation of resources, while the optimized process can ensure efficient use of resources. In a satellite-ground fusion network, satellite link resources are precious, and reducing unnecessary signaling interactions can reduce the transmission burden on satellite links, especially in high traffic or resource-constrained conditions. This optimization is particularly important for ensuring network stability and efficiency.

[0103] Therefore, by optimizing AMF to first select the target MME, not only the signaling process is streamlined and the interaction efficiency is improved, but also the network's transmission speed and resource optimization capabilities are indirectly improved, which has a significant performance improvement effect, especially for special scenarios such as satellite communications.

[0104] In steps 7 to 8, the source AMF does not carry the EPS PGW-U entity tunnel info (PGW-U entity tunnel info) mapped by 5GS when sending the relocation request and the create session request to the target MME. The target MME requests the SGW to allocate the SGW tunnel info to inform the E-UTRAN to establish a data channel from the E-UTRAN to the SGW.

[0105] In the traditional switching process, the acquisition and transmission of tunnel information are carried out in steps, which increases the number of network signaling interactions. In the optimized process, AMF does not carry PGW-U entity tunnel info in the early stage, avoiding unnecessary information transmission, reducing the number of signaling interactions, thereby reducing network load and improving switching efficiency. In the traditional switching process, the acquisition and transmission of tunnel information are carried out in steps, which increases the number of network signaling interactions. In the optimized process, AMF does not carry PGW-U entity tunnel info in the early stage, avoiding unnecessary information transmission, reducing the number of signaling interactions, thereby reducing network load and improving switching efficiency; The optimized process avoids failures caused by tunnel information errors during the switching process and improves the switching success rate. In the satellite-ground integrated network, due to the complexity of the satellite network environment, this optimization helps to reduce switching failures caused by signaling problems and ensure the high quality of user services. Before confirming whether the target network needs and can use this tunnel information, the PGW-U entity tunnel info will not be allocated and transmitted. This can avoid pre-occupancy of resources and improve the utilization efficiency of network resources. This optimization is particularly important in the satellite network environment where resource management is more stringent.

[0106] Therefore, the optimization method of EPS PGW-U entity tunnel info without 5GS mapping improves the performance and user experience of 5GS switching to EPS in the satellite-ground fusion network by reducing signaling interaction, simplifying the process, enhancing network flexibility, reducing the switching failure rate and improving resource utilization efficiency.

[0107] 9~11 Figure 4 9~11, 12. The source AMF sends an Nsmf_PDUSessionContext request to the SMF, carrying the tunnel info of the SGW CN side (core network side) obtained in the above step 10.2, and requesting PGW-C / SMF to provide the EPS connection information required by the target MME (that is, the above EPS bearer information).

[0108] 13.1 Same Figure 4 Same as 13.1 and 13.2 Figure 4 13.2, and if the user plane information has not been allocated in the current 5G network, the UPF Tunnel info carried in the optional step 4.2 is added (that is, when the 5G core network does not establish a 5G bearer for the UE, the SMF / PGW-C instructs the UPF / PGW-U to allocate tunnel information, where the tunnel information is the tunnel information used by the user plane function during data transmission).

[0109] 14. Same Figure 414, and at the same time increase the mapping of the PGW-U entity tunnelinfo described in step 13.2 above, the SMF mapping process Figure 4 4.2~4.3, 15~18. Same as Figure 4 15~18, same as 19.1 Figure 4 Same as 19.1 and 19.2 Figure 4 19.2, and add the PGW-U entity Tunnel info obtained from step 14.

[0110] 20. Same Figure 4 20, and at the same time add the PGW-U entity Tunnel info obtained from 19.2. At this point, the EPS uplink data path from SGW to PGW-U / UPF is established.

[0111] 21.~26 same Figure 4 21~26.

[0112] The present application also provides a schematic diagram of the structure of a data interaction system. Figure 6 As shown, it includes an AMF entity and a target MME entity.

[0113] The AMF entity is used to receive a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network, determine the target MME entity, wherein the target MME entity is the MME entity in the 4G network area to be switched, and send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that the user equipment UE will be switched from the 5G network to the 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0114] The target mobility management entity MME entity is used to receive the relocation request sent by the access and mobility management function AMF entity, and send a create session request to the service gateway SGW, wherein the create session request does not carry the tunnel information used by the user plane function during data transmission.

[0115] The present application embodiment provides a schematic diagram of the structure of a data interaction device, such as Figure 7 As shown, it includes a receiving module 702 , a determining module 704 , and a sending module 706 .

[0116] The receiving module 702 is used for the access and mobility management function AMF entity to receive a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network.

[0117] Determination module 704 is used for the AMF entity to determine the target mobility management MME entity, wherein the target MME entity is the MME entity in the 4G network area to be switched.

[0118] The sending module 706 is used for the AMF entity to send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0119] It should be noted that the various modules in the above-mentioned data interaction device can be program modules (for example, a set of program instructions that implement a certain specific function) or hardware modules. For the latter, it can be expressed in the following forms, but is not limited to this: the expression form of each of the above-mentioned modules is a processor, or the functions of each of the above-mentioned modules are implemented by a processor.

[0120] The embodiment of the present application also provides a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the above data interaction method. For example, an access and mobility management function AMF entity receives a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network; the AMF entity determines the target mobility management MME entity, wherein the target MME entity is the MME entity in the 4G network area to be switched; the AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from the 5G network to the 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0121] The embodiment of the present application also provides an electronic device, the electronic device includes a processor, the processor is used to run a program, wherein the above data interaction method is executed when the program is running. For example, an access and mobility management function AMF entity receives a network switching request message of a next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user device to switch from a 5G network to a 4G network; the AMF entity determines a target mobility management MME entity, wherein the target MME entity is an MME entity in a 4G network area to be switched; the AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user device UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0122] According to another aspect of the embodiment of the present application, a computer program product is also provided, including a computer program, which implements the above data interaction method when executed by a processor. For example, an access and mobility management function AMF entity receives a network switching request message of a next-generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user device to switch from a 5G network to a 4G network; the AMF entity determines a target mobility management MME entity, wherein the target MME entity is an MME entity in the 4G network area to be switched; the AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user device UE will be switched from a 5G network to a 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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, or the part that contributes to the relevant technology or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer 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, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0128] 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 data interaction method, characterized in that: include: The access and mobility management function AMF entity receives a network switching request message of the next generation radio access network NG-RAN, wherein the network switching request message is used to instruct the user equipment to switch from the 5G network to the 4G network; The AMF entity determines a target mobility management MME entity, wherein the target MME entity is an MME entity in the 4G network area switched to; The AMF entity sends a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from the 5G network to the 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

2. The method according to claim 1, characterized in that After the AMF entity sends a relocation request to the target MME entity, the method further includes: The AMF entity receives a response message sent by the target MME entity, wherein the response message is a response message of the relocation request; After receiving the response message, the AMF entity sends a session context request to the session management function SMF entity / packet data network gateway control plane PGW-C entity, and the session context request includes the tunnel information of the service gateway SGW core network side obtained from the evolved universal terrestrial radio access network E-UTRAN and the bearer information of the evolved packet system EPS.

3. The method according to claim 2, characterized in that After the AMF entity sends a session context request to the session management function SMF entity / packet data network gateway control plane PGW-C entity, the method further includes: When the 5G core network does not establish a 5G bearer for the UE, the SMF entity / PGW-C entity instructs the user plane function UPF entity of the packet data network gateway / the user plane PGW-U entity of the packet data network gateway to allocate tunnel information, wherein the tunnel information is the tunnel information used by the user plane function during data transmission.

4. The method according to claim 3, characterized in that The SMF entity and the user plane function UPF entity are core network elements that allocate the tunnel information in the 5G network, and the PGW-C entity and the PGW-U entity are core network elements that allocate the tunnel information in the 4G network.

5. The method according to claim 3, characterized in that: After allocating the tunnel information, the method also includes: the AMF entity receives a notification message sent by the target MME entity, wherein the notification message is used to notify the AMF entity that the switch from the 5G network to the 4G network is completed, and the notification message includes the tunnel information after mapping from the 5G network to the 4G network.

6. The method according to claim 1, characterized in that The AMF entity determines the target MME entity based on network load, geographic location or service quality parameters.

7. A data interaction method, characterized in that: include: The target mobility management entity MME entity receives the relocation request sent by the access and mobility management function AMF entity; The target MME entity sends a session creation request to the serving gateway SGW, wherein the session creation request does not carry tunnel information used by the user plane function during data transmission.

8. The method according to claim 7, characterized in that The method further comprises: The MME entity receives a network switching request message sent by an evolved universal terrestrial radio access network E-UTRAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; The MME entity sends a relocation completion notification to the AMF entity and the SGW, wherein the relocation completion notification includes tunnel information after mapping from the 5G network to the 4G network, wherein the tunnel information is tunnel information used by the user plane function during data transmission.

9. A data interaction device, characterized in that: include: A receiving module, configured for an access and mobility management function AMF entity to receive a network switching request message of a next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network; A determination module, used for the AMF entity to determine a target mobility management MME entity, wherein the target MME entity is an MME entity in the 4G network area to be switched; A sending module is used for the AMF entity to send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from the 5G network to the 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network.

10. A data interaction system, characterized in that: include: Access and mobility management function AMF entity, target mobility management entity MME entity; The AMF entity is used to receive a network switching request message of a next generation radio access network NG-RAN, wherein the network switching request message is used to instruct a user equipment to switch from a 5G network to a 4G network, determine a target MME entity, wherein the target MME entity is an MME entity in a 4G network area switched to, and send a relocation request to the target MME entity, wherein the relocation request is used to notify the target MME entity that a user equipment UE will be switched from the 5G network to the 4G network, and request the target MME entity to establish a new connection for the UE in the 4G network; The target mobility management entity MME entity is used to receive the relocation request sent by the access and mobility management function AMF entity, and send a create session request to the service gateway SGW, wherein the create session request does not carry the tunnel information used by the user plane function during data transmission.

11. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the data interaction method described in any one of claims 1 to 6, or the data interaction method described in any one of claims 7 to 8.

12. An electronic device, characterized in that: include: A memory and a processor, wherein the processor is used to run a program stored in the memory, wherein when the program is run, the method for data interaction described in any one of claims 1 to 6 is executed, or the method for data interaction described in any one of claims 7 to 8 is executed.

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