WO2024037611A1

WO2024037611A1 - Registration information synchronization method and apparatus, and device and medium

Info

Publication number: WO2024037611A1
Application number: PCT/CN2023/113662
Authority: WO
Inventors: 蔡玉婷; 李馥馨
Original assignee: 展讯半导体(成都)有限公司
Priority date: 2022-08-18
Filing date: 2023-08-18
Publication date: 2024-02-22
Also published as: CN115397003A

Abstract

Provided in the present invention are a registration information synchronization method and apparatus, and a device and a medium. The method may be applied to a terminal, and comprises: when a terminal is switched from a first communication system to a second communication system, sending a first tracking-area update request message to a network device of the second communication system, wherein the first tracking-area update request message comprises a first GUTI of the terminal in the first communication system; receiving a tracking-area update acceptance message from the network device, wherein the tracking-area update acceptance message comprises a second GUTI, which is configured for the terminal; and when it is determined that the sending of a tracking-area update completion message fails, triggering a set timer to start timing until the set timer expires, and then sending a second tracking-area update request message to the network device, wherein the second tracking-area update request message comprises the second GUTI. The method is used for improving the possibility of successful registration information synchronization in a registration information synchronization scenario.

Description

Registration information synchronization method, device, equipment and media

cross reference

This application claims priority to the Chinese application with application number 2022109944075 submitted on August 18, 2022. The contents of the above application are incorporated herein by reference.

Technical field

The present application relates to the field of communication technology, and in particular, to a registration information synchronization method, device, equipment and medium.

Background technique

The current 3rd generation partner project (3GPP) agreement supports the interaction between the fourth generation (4th generation, 4G) mobile communication technology systems and the fifth generation (5th generation, 5G) mobile communication technology systems. operate. In other words, when both 5G network and 4G network exist in the network environment, the terminal can switch from the 5G network to the 4G network, or from the 4G network to the 5G network. 5G is the latest generation of mobile communication technology, which can provide higher data rates, lower latency, full connectivity of the Internet of Everything, more energy saving, lower costs, higher system capacity and large-scale device access.

When a terminal switches from a 5G system to a 4G system, it is generally necessary to initiate a Tracking Area Update (TAU) process to synchronize the registration information between the terminal and the network-side device. However, TAU failure will cause the terminal to drop the network, resulting in Unable to use 4G system services, terminal call drops and other bad experiences.

Therefore, there is an urgent need to provide a new registration information synchronization method to improve the possibility of successful TAU process, thereby improving the possibility of successful registration information synchronization in network switching scenarios.

Contents of the invention

The purpose of the present invention is to provide a registration information synchronization method, device, equipment and medium, which method is used to improve the possibility of successful registration information synchronization in a network switching scenario.

In a first aspect, the present invention provides a registration information synchronization method, which can be applied to a terminal device, including: when the terminal switches from a first communication system to a second communication system, sending a message to a network device of the second communication system. A first tracking area update request message, the first tracking area update request message includes the first GUTI of the terminal in the first communication system, wherein the first globally unique temporary identity GUTI includes the same as the first GUTI of the terminal. An identifier related to the communication system; receiving a tracking area update acceptance message from the network device, the tracking area update acceptance message including the second GUTI configured for the terminal; when it is determined that the tracking area update completion message fails to be sent, trigger Set a timer to start timing, and after the set timer times out, send a second tracking area update request message to the network device, where the second tracking area update request message includes the second GUTI, where The second GUTI is different from the first globally unique temporary identity GUTI, and the second GUTI includes an identifier related to the second communication system of the terminal.

The beneficial effect of the registration information synchronization method provided by the present invention is that after a network switch occurs in the terminal, the second GUTI assigned by the switched network is used to try the TAU process again, which helps to improve the possibility of the TAU process being successful. This method It can improve the possibility of successful synchronization of registration information in network switching scenarios without affecting the normal use of users, thereby ensuring business continuity and improving user experience.

In a possible implementation, sending a second tracking area update request message to the network device of the second communication system includes: determining the tracking area of the cell where the terminal currently camps and the area where the terminal camps when switching to the second communication system. Whether the tracking area of the remaining cell has changed; when the change occurs, send a second tracking area update request message to the network device of the second communication system. In this embodiment, since the tracking area of the terminal's cell has changed, using the second GUTI allocated by the network after the handover to try the TAU process again helps to improve the possibility of the TAU process being successful.

In another possible implementation, the method further includes: when no change occurs, communicating to the second The network device of the system sends the first tracking area update request message. In this implementation, since the tracking area of the terminal's cell has not changed, using the first GUTI to try the TAU process again helps to improve the possibility of the TAU process being successful.

In other possible implementations, the method further includes: when it is detected that the tracking area location update is successful, establishing a service link with the network device of the second communication system. In this embodiment, when the TAU process is successful, the terminal can communicate normally with the network equipment in the post-switched network.

In another possible implementation manner, when the first communication system is a 5G system, the second communication system is a 4G system.

In a second aspect, embodiments of the present application provide a registration information synchronization device. Each unit in the device can also perform other possible design methods of the above-mentioned first aspect. For details, please refer to the above-mentioned first aspect. These modules/units can be implemented by hardware, or they can be implemented by hardware executing corresponding software.

In a third aspect, embodiments of the present application provide a terminal, including a memory and a processor. The memory stores a computer program that can be run on the processor. When the computer program is executed by the processor, the electronic device performs the above-mentioned first aspect. any possible design method.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. When the computer program is executed by a processor, the electronic device causes the electronic device to execute any of the above-mentioned aspects of the first aspect. One possible design approach.

In a fifth aspect, embodiments of the present application also provide a chip or chip module, the chip is coupled to or the chip module memory, and is used to execute the computer program stored in the memory, so that the terminal device executes any one of the above-mentioned first aspects. possible design methods.

Regarding the beneficial effects of the above second to fifth aspects, please refer to the description of the above first aspect.

Description of drawings

Figure 1 is a schematic diagram of a network architecture provided by an embodiment of the present invention;

Figure 2 is a schematic diagram of a PDN connection provided by an embodiment of the present application;

Figure 3 is a schematic diagram of a PDU session provided by an embodiment of the present application;

Figure 4 is a schematic flow chart of a registration information synchronization method provided by an embodiment of the present invention;

Figure 5 is a schematic flow chart of another registration information synchronization method provided by an embodiment of the present invention;

Figure 6 is a schematic structural diagram of a registration information synchronization device provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of a terminal provided by an embodiment of the present application.

Detailed ways

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

In the description of the embodiments of the present application, the terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "the," "above," "the" and "the" are intended to also include, for example, "a "or more" unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, "at least one" and "one or more" refer to one or more than two (including two). The term "and/or" is used to describe the relationship between associated objects, indicating that there can be three relationships; for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone, Where A and B can be singular or plural. The character "/" generally indicates that the related objects are in an "or" relationship.

Reference in this specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Therefore, the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in other embodiments", etc. appearing in different places in this specification are not necessarily References are made to the same embodiment, but rather to "one or more but not all embodiments" unless specifically stated otherwise. The terms “including,” “includes,” “having,” and variations thereof all mean “including but not limited to,” unless otherwise specifically emphasized. The term "connection" Includes direct and indirect connections unless otherwise stated. “First” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features.

In the embodiments of this application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "such as" in the embodiments of the present application is not to be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a concrete manner.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), fifth generation (5th generation, 5G) system or new radio (new radio, NR), or applied to future communication systems or other similar communication systems.

The technical solution provided by the embodiments of the present application is applicable to the scenario where the terminal device switches from the first communication system to the second communication system, where the first communication system and the second communication system are systems supporting different communication standards respectively. In this way, the first communication system The communication system may also be called a first network or a first standard system, and the second communication system may also be called a second network or a second standard system. For example, the first communication system may be a 5G communication system, and the second communication system may be a 4G communication system. The 5G communication system may also be called a 5G network or simply called a 5G system. The 4G communication system may also be called an EPS network or simply called a EPS network. 4G system. It should be understood that the first communication system and the second communication system in the embodiment of the present application can also be future communication systems or other similar communication systems, which is not limited by this application. In addition, the bearer in the embodiment of the present application can also be called It is a quality of service flow, or it may be called other names in future communication systems (the function remains unchanged), and this application is not limited to this.

Refer to Figure 1, which is a schematic diagram of a possible network architecture applicable to the embodiment of the present application. In this network architecture, the 5G network and the EPS network coexist. Below, the main network elements involved in the network architecture are described.

The EPS network can include the following network elements:

1. (Radio access network, (R)AN) network element: used to provide network access functions for authorized terminal equipment in a specific area, and can use different qualities according to the level of the terminal equipment, business needs, etc. transmission tunnel.

The (R)AN network element can manage wireless resources, provide access services to terminal equipment, and then complete the forwarding of control signals and terminal equipment data between the terminal equipment and the core network. The (R)AN network element can also be understood as a traditional network base station in . In the 4G communication system, (R)AN network element can also be called evolved universal terrestrial radio access network (E-UTRAN) or evolved base station (eNB), as shown in Figure 1 Show.

It should be noted that the above-mentioned "network element" can also be called an entity, equipment, device or module, etc., and is not specifically limited in this application. Moreover, in this application, in order to facilitate understanding and explanation, the description of "network element" is omitted in some descriptions. For example, the (R)AN network element is referred to as RAN for short. In this case, the "(R)AN network element" "Element" should be understood as (R)AN network element or (R)AN entity. In the following, description of the same or similar situations will be omitted.

2. Mobility management entity (MME), used to provide mobility management functions. In addition, MME can also provide functions such as legal interception and access authorization/authentication.

3. Serving gateway (SGW), used to provide user data forwarding and other functions.

4. Packet data network gateway user function (PGW-U), used to provide the user plane function of the public data network (public data network, PDN) gateway.

5. Packet data network gateway control function (PGW-C), used to provide the control plane function of the PDN gateway.

6. Policy and charging rules function (PCRF), used to Provide a unified policy framework to guide network behavior, and provide policy rule information for control plane functional network elements.

7. Home subscriber server (HSS), including user configuration files, is used to perform user authentication and authorization, and can provide information about the user's physical location.

A 5G network can include the following network elements:

1. (R)AN network element: used to provide network access functions for authorized terminal equipment in a specific area, and can use transmission tunnels of different qualities according to the level of the terminal equipment, business requirements, etc.

In the 5G communication system, the (R)AN network element can also be called the next generation radio access network (NG-RAN, as shown in Figure 1) or the next generation base station (gNB).

2. Access and mobility management function (AMF), a function used for access management and mobility management. In addition, AMF can also provide functions such as legal interception and access authorization/authentication.

In one possible design, the AMF can communicate with the MME through the N26 interface. In Figure 1, the letters and numbers in the connection attachments between each network element represent the name of the communication interface between each network element. However, the communication interface between each network element can also have other names, and this application does not include them here. not limited.

3. User plane function (UPF), used for packet routing and forwarding and quality of service (QoS) processing or execution of user plane data.

4. Session management function (SMF), mainly used for session management, Internet protocol (IP) address allocation and management of terminal equipment, selection and management of user plane functions. In addition, SMF can also be the endpoint of policy control and charging function interfaces.

5. Policy control function (PCF), a unified policy framework used to guide network behavior and provide policy rule information for control plane functional network elements (such as AMF, SMF, etc.).

6. Unified data management (UDM) network element, used to manage contract signing data. In addition, it is also used for user service registration management, processing terminal device identification, access authentication, etc.

In the above network architecture, network elements with the same or similar functions can be set up jointly or deployed together. For example, UPF and PGW-U can be co-located in one device or deployed separately in different devices, SMF and PGW-C can be co-located in one device or deployed separately in different devices, and PCF and PCRF can be co-located. HSS and UDM can be co-located in one device or deployed separately in different devices.

It should be understood that the above network architecture applied to this application is only an example of a network architecture described from the perspective of a service-oriented architecture. The network architecture applicable to the embodiments of this application is not limited to this. Any network architecture that can realize the functions of each of the above network elements All network architectures are applicable to the embodiments of this application.

The above network elements or functions may be network elements in hardware devices, software functions running on dedicated hardware, or virtualization functions instantiated on a platform (for example, a cloud platform).

In the EPS network, user equipment or terminal (user equipment, UE) establishes a PDN connection (PDN connection) with the network. At least one bearer can be established in each PDN connection. The internal structure of the PDN connection is shown in Figure 2. The main features are as follows:

(1). The aggregate maximum bit rate corresponding to one access point name (APN) and one access point name (APN-AMBR) in a PDN connection. Among them, APN and APN AMBR are obtained by the MME from the HSS during the location request process during the UE attachment process.

(2) In a PDN connection, there is only one default Evolved Packet System bearer (default EPS bearer), which is created during the establishment process of the PDN connection. At least one service data flow (Service Data flow) can be aggregated in one default EPS bearer. SDF); a PDN connection may also include one or more non-guaranteed bit rate Evolved Packet System bearers (Non guaranteed bit rate EPS bearer, Non GBR EPS bearer), dedicated Evolved Packet System bearers initiated on the UE or network side ( Dedicated EPS bearer) is created during the establishment process. There is at least one SDF in a non-GBR EPS bearer, and it can also aggregate one or more other SDFs; a PDN connection can also include a Or multiple guaranteed bit rate evolved packet system bearers (guaranteed bit rate EPS bearer, GBR EPS bearer), created during the dedicated EPS bearer establishment process initiated by the UE or the network side. There is at least one SDF in a GBR EPS bearer, which can also be aggregated. One or more other SDFs.

Among them, each bearer in Figure 2 has corresponding QoS parameters and is used to transmit the corresponding SDF. The MME network element will allocate an EPS bearer identity (EBI) to each bearer, and send the EPS bearer identity to the UE during the bearer establishment process. For the default bearer, the EPS bearer ID (bearer ID) is sent to the UE during the establishment of the PDN connection. For the dedicated bearer, the EPS bearer ID (bearer ID) is sent to the UE during the establishment of the dedicated bearer.

Among them, the Qos parameters of the default bearer are different from the Qos parameters of the dedicated bearer. The Qos parameters corresponding to different types of EPS bearers are shown in Table 1.

Table 1

In the 5G network, the UE and the network establish a protocol data unit (PDU) session (PDU Session). At least one quality of service flow (QoS flow) can be established in each PDU session. The internal structure of the PDU session is shown in Figure 3. The main features are as follows:

(1) A PDU session corresponds to a DNN, a PDU Session ID and a session aggregate maximum bit rate (Session aggregate maximum bit rate, Session AMBR). Among them: DNN and Session AMBR are obtained by AMF from UDM during the location request process during the UE registration process; the PDU Session ID is allocated by the SMF network element during the PDUSession establishment process initiated by the UE;

(2) In a PDU session, there is only one default QoS flow (default quality of service flow), which is created during the establishment of the PDU session. At least one SDF can be aggregated in a default QoS flow. A PDU session may also contain one or more Non-Guaranteed Bit Rate Evolved Packet System Quality of Service flows (Non GBR QoS flows), which are created during the PDU Session modification process initiated by the UE or the network side. There is at least one SDF in a non-GBR QoS flow, and multiple SDFs can also be aggregated. A PDU session can also contain one or more Guaranteed Bit Rate Evolved Packet System Quality of Service flows (GBR QoS flows), which are created during the PDU Session modification process initiated by the UE or the network side. There is at least one SDF in a GBR QoS flow. , multiple SDFs can also be aggregated.

Among them, each QoS flow in Figure 3 has corresponding QoS parameters and is used to transmit the corresponding service data flow. The SMF network element will assign a quality of service flow identifier (QoS flow ID, QFI) to each QoS flow and send the QFI to the UE. For the default quality of service flow, the QFI is sent to the UE during the establishment of the PDU session. For the dedicated quality of service flow, the QFI is sent to the UE during the establishment of the dedicated quality of service flow.

Among them, the Qos parameters of the default quality of service flow and the Qos parameters of the dedicated quality of service flow are different. The Qos parameters corresponding to different types of quality of service flows are shown in Table 2.

Table 2

In the embodiments of this application, the QoS parameters in Table 1 and Table 2 are only examples. The QoS parameters may include one or more of the above parameters, which are not limited in the embodiments of this application.

To sum up, in the interoperation between Long Term Evolution (LTE) network and 5G network, PDU session corresponds to PDN connection, and EPS bearer corresponds to QoS flow. Specifically, the corresponding relationship is shown in Table 3 .

table 3

In this embodiment, user equipment (UE) may also be called terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, Wireless communications equipment, user agent or user device. The terminal device in the embodiment of this application may be a mobile phone, a tablet computer (Pad), a smart printer, a train detector, a gas station detector, a computer with wireless transceiver functions, or a virtual reality (VR) terminal. equipment, augmented reality (AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, smart grids ( Wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, etc. The embodiments of this application do not limit application scenarios.

It can be seen from the network architecture shown in Figure 1 that in the scenario where the 5G network and the EPS network coexist as shown in Figure 1, the terminal device can move (including handover or redirection) from the 4G communication system to the 5G communication system, or it can Move (including handover or redirection) from the 5G communication system to the 4G communication system.

In the LTE system (that is, the system where 4G communications are located), in order to facilitate the location management of terminals, the concept of tracking area (TA) is proposed. TA is defined as a free movement area where terminals do not need to update services. Therefore, when a terminal moves from one TA to another, it needs to re-register its location on the new TA to notify the network device to change the stored registration information of the terminal. This process It is Tracking Area Update (TAU). When the UE performs TAU, many network elements are involved, such as: evolved base station (e-Node, eNB), MME, serving gateway (Serving GateWay, SGW), home subscriber server (Home Subscriber Server, HSS) and home Location Register (Home Location Register, HLR), etc.

As shown in Figure 4, an embodiment of the present application provides a registration information synchronization method, which method includes:

S401. The terminal switches from the first communication system to the second communication system.

S402: The terminal sends a first tracking area update request message to the second communication system.

Wherein, the first Tracking Area Update Request message (Tracking Area Update Request, TAU Request) includes a first Globally Unique Temporary Identity (GUTI) of the terminal in the first communication system, wherein the first Globally Unique Temporary Identity (GUTI) The temporary identification GUTI includes an identifier associated with the first communication system of the terminal. That is, the first globally unique temporary identifier GUTI includes an identifier indicating that the terminal has successfully registered in 5G (assigned by the 5G network).

S403. The second network sends a tracking area update acceptance message to the terminal.

Wherein, the Tracking Area Update Accept message (Tracking Area Update Accept, TAU Accept) includes a second GUTI configured for the terminal, wherein the second GUTI is different from the first globally unique temporary identifier GUTI, and the The second GUTI includes an identifier associated with the terminal's second communications system. That is, the second GUTI includes an identifier indicating that the terminal is successfully registered in 4G (assigned by the 4G network).

S404: The terminal determines that the tracking area update completion message has failed to be sent, and triggers the set timer to start counting.

S405: After the set timer times out, send a second tracking area update request message to the network device, where the second tracking area update request message includes the second GUTI.

S406: The network device of the second communication system updates the network device according to the second request message. The registration information of the terminal is stored.

Optionally, before performing S403, the following judgment is also performed: when the terminal determines, through cell signal measurement, that the tracking area (Tracking Area, TA) of the cell where it is currently camped is different from the cell where it camped when switching to the second communication system. When the TA of the cell changes, the terminal sends a second tracking area update request message to the second network; when the terminal determines through cell signal measurement that the TA of the cell where it is currently camped is the same as the cell where it camped when switching to the second communication system. When the TA of the cells is the same, the terminal sends the first tracking area update request message to the second network again, and then the network device of the second network updates the network device stored in the first tracking area update request message according to the first tracking area update request message. Registration information of the terminal.

In a possible implementation, when the terminal detects that the tracking area location update is successful, the terminal establishes a service link with the network device of the second communication system, and then the terminal obtains communication services in the second communication system after switching.

In the following, taking the first communication system as a 5G system and the second communication system as a 4G system, that is, the UE switches from the 5G network to the LTE network as an example, the above registration information synchronization method is systematically explained with an example, as shown in Figure 5. The method includes the following steps:

S501, the UE switches from the 5G network to the LTE network (that is, the system where 4G communication is located).

S502. When the UE switches from the 5G network to the LTE network (that is, the system where 4G communication is located), the UE sends a first TAU request (request) message to the network device of the LTE network. The first TAU request message includes the first GUTI, where , the first globally unique temporary identity GUTI includes an identifier related to the first communication system of the terminal. That is, the first globally unique temporary identifier GUTI includes an identifier indicating that the terminal has successfully registered in 5G (assigned by the 5G network).

In this step, the TAU Request message may be sent by the UE's LTE non-access stratum (Non-Access Stratum, NAS).

S503. The network device of the LTE network returns a TAU accept message to the UE. The TAU accept message includes a second GUTI configured for the terminal, where the second GUTI is different from the first globally unique temporary identity GUTI. The second GUTI includes information related to the second communication system of the terminal. identifier. That is, the second GUTI includes an identifier indicating that the terminal is successfully registered in 4G (assigned by the 4G network).

S504: The UE sends a TAU completion (complete) message to the network device of the LTE network.

S505, the UE determines that the TAU completion message has failed to be sent, and the UE starts the T3411 timer with a duration of 10s.

After the UE fails to perform the previous TAU, the first timer will be triggered to start counting; during the first timer period, although the UE is in a state of trying to register and update the tracking area location, it suspends sending the tracking area location update request (TAU Request); After the first timer times out, the UE resends the TAU Request to perform TAU.

S506: When T3411 times out, the UE determines whether the TA of the cell where the UE is camped has changed compared with the TA of the cell where the UE is switched to the LTE network. If so, perform S507; otherwise, perform S508.

S507: If the TA of the cell where the UE camps on changes compared with the TA of the cell where the UE camps on when switching to the LTE network, the UE sends the second GUTI and tries the TAU process again.

S508: If the TA of the cell where the UE is camped has not changed compared with the TA of the cell where the UE is camped after switching to the LTE network, the UE sends the first GUTI again and tries the TAU process again.

S509: The terminal updates the registration information of the terminal stored in the network device.

Afterwards, wait for TAU to be successful and synchronize the registration information between the UE and the LTE network, so that the UE can establish a service link with the network equipment of the LTE network. The registration information at least includes the TA information of the UE, and the registration information may also include the TA assigned by the network equipment to the UE. GUTI and UE establish user plane resource requests, etc.

It should be understood that there are many reasons for UE TAU failure, such as: underlying failure, timer timeout, TAU rejection caused by EPS mobility management (Evolved Packet System-Mobility Management, EMM), etc.

It should be noted that in the existing technology, when 2/3G is switched to 4G to initiate a TAU Request, the old GUTI type carried is "mapped GUTI" (that is, a new GUTI is obtained after conversion processing). The value of GUTI is mapped from P-TMSI and RAI. That is to say, in the prior art, when switching from 2/3G to 4G, the UE sends a first TAU request (request) message to the network device of the LTE network (that is, the system where 4G communication is located). The first TAU request message includes The first GUTI mapped from P-TMSI and/or RAI.

In the embodiment of the present invention, when a TAU Request is initiated when switching from 5G to 4G, the old GUTI type carried is "native GUTI" (that is, the GUTI is obtained without conversion processing), and the value of old GUTI is mapped from 5G-GUTI At the same time, bring the UE status IE, indicating "UE is in 5GMM-REGISTERED state" (that is, the status of the terminal successfully registered in 5G).

In order to implement each function in the communication method provided by the embodiments of the present application, the terminal may include a hardware structure and/or a software module to implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is performed as a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

The same concept as the above embodiment, the embodiment of the present application also provides a registration information synchronization device. The registration information synchronization device 600 is used to implement the functions of the terminal in the above method. For example, the registration information synchronization device 600 may be a terminal or a device in a terminal device. The device may be a chip system in the terminal. In the embodiments of this application, the chip system may be composed of chips, or may include chips and other discrete devices.

In an example, as shown in FIG. 6 , the registration information synchronization device 600 includes a sending unit 601 and a receiving unit 602.

Sending unit 601, configured to send a first tracking area update request message to the network device of the second communication system when the terminal switches from the first communication system to the second communication system, where the first tracking area update request message includes The first globally unique temporary identity GUTI of the terminal in the first communication system, wherein the first globally unique temporary identity GUTI includes an identifier related to the first communications system of the terminal. That is, the first globally unique temporary identifier GUTI includes an identifier indicating that the terminal has successfully registered in 5G (assigned by the 5G network);

Receiving unit 602, configured to receive a tracking area update accept message from the network device of the second communication system, where the tracking area update accept message includes a second GUTI configured for the terminal, wherein the second GUTI is the same as the second GUTI. Different from the first globally unique temporary identifier GUTI, the second GUTI includes an identifier related to the second communication system of the terminal. That is, the second GUTI includes an identifier indicating that the terminal is successfully registered in 4G (assigned by the 4G network);

The sending unit 601 is also configured to trigger a set timer to start timing when it is determined that the tracking area update completion message fails to be sent, and until the set timer times out, send the second tracking area to the network device of the second communication system. An update request message, the second tracking area update request message includes a second GUTI of the terminal in the second communication system.

The device also includes a processing unit 603, configured to: when it is detected that the tracking area location update is successful, perform service transmission with the network equipment of the second communication system.

For the specific execution process and beneficial effects of the above units, please refer to the records in the related methods in Figure 4 above.

The division of modules in the embodiments of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. In addition, each functional module in each embodiment of the present application may be integrated into one processing unit. In the device, it can exist physically alone, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software function modules.

In yet another example, as shown in FIG. 7 , the terminal includes at least one processor 710 and a memory 720 . Among them, the computer program is stored in the memory 720 . Memory 720 and processor 710 are coupled. Coupling in the embodiments of this application is a spaced coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. As another implementation, the memory 720 may also be located outside the communication device 700. Processor 710 may cooperate with memory 720. Processor 710 may invoke computer programs stored in memory 720 . At least one of the at least one memory may be included in the processor.

In some embodiments, the communication device 700 may also include a communication interface 730 for communicating with other devices through a transmission medium, so that the devices used in the communication device 700 can communicate with other devices. Illustratively, the communication interface 730 may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces, and the other devices may be other terminals. The processor 710 uses the communication interface 730 to send and receive information, and is used to implement the methods in the above embodiments. Exemplarily, the communication interface 730 is used to receive resource indication information. As another example, the communication interface 730 is used to send data.

In the embodiment of this application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or Execute each method, step and logical block diagram disclosed in the embodiment of this application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor for execution, or can be executed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or it may be a volatile memory (volatile memory), such as Random-access memory (RAM). Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in the embodiment of the present application can also be a circuit or any other device capable of realizing a storage function, used to store computer programs and/or data.

The methods provided by the embodiments of this application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program is loaded and executed on a computer, the processes or functions described in accordance with the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless , microwave, etc.) to another website, computer, server or data center. The computer-readable storage medium may be any medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more media integrated therein. The media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, SSD), etc.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A registration information synchronization method, characterized in that it is applied to a terminal and includes:

When the terminal switches from the first communication system to the second communication system, a first tracking area update request message is sent to the network device of the second communication system, and the first tracking area update request message includes the information of the terminal in the first communication system. The first globally unique temporary identifier GUTI in communication systems;

Receive a tracking area update accept message from the network device, the tracking area update accept message including a second GUTI configured for the terminal, wherein the second GUTI is different from the first globally unique temporary identity GUTI;

When it is determined that the tracking area update completion message has failed to be sent, the set timer is triggered to start timing. After the set timer times out, a second tracking area update request message is sent to the network device. The second tracking area update request is The message includes the second GUTI.
The method according to claim 1, characterized in that sending a second tracking area update request message to the network device of the second communication system includes:

Determine whether the tracking area of the cell where the terminal is currently camped has changed compared with the tracking area of the cell where the terminal is camped when switching to the second communication system;

When the tracking area changes, a second tracking area update request message is sent to the network device of the second communication system.
The method according to claim 2, further comprising:

When the tracking area does not change, the first tracking area update request message is sent to the network device of the second communication system again.
The method according to any one of claims 1 to 3, further comprising:

When it is detected that the tracking area location update is successful, a service link is established with the network device of the second communication system.
The method according to any one of claims 1 to 3, characterized in that when the first communication system is a 5G system, the second communication system is a 4G system.
A registration information synchronization device, characterized by including:

A sending unit configured to send a first tracking area update request message to the network device of the second communication system when the terminal switches from the first communication system to the second communication system, where the first tracking area update request message includes the The first globally unique temporary identifier GUTI of the terminal in the first communication system;

A receiving unit configured to receive a tracking area update accept message from a network device of the second communication system, where the tracking area update accept message includes a second GUTI configured for the terminal, wherein the second GUTI is the same as the The first globally unique temporary identifier GUTI is different;

The sending unit is also configured to trigger a set timer to start timing when it is determined that the tracking area update completion message has failed to be sent, and until the set timer times out, send the second tracking area update to the network device of the second communication system. request message, the second tracking area update request message includes the second GUTI of the terminal in the second communication system.
The device according to claim 6, wherein the sending unit sends a second tracking area update request message to the network device of the second communication system, specifically for:

Determine whether the tracking area of the cell where the terminal is currently camped has changed compared with the tracking area of the cell where the terminal is camped when switching to the second communication system;

When the tracking area changes, a second tracking area update request message is sent to the network device of the second communication system.
The device according to claim 7, characterized in that the sending unit is also used to:

When the tracking area does not change, the first tracking area update request message is sent to the network device of the second communication system again.
The device according to any one of claims 6 to 8, characterized in that the device further includes a processing unit for:

When it is detected that the tracking area location update is successful, service transmission is performed with the network device of the second communication system.
The device according to any one of claims 6 to 8, characterized in that when the first communication system is a 5G system, the second communication system is a 4G system.
A terminal, characterized in that it includes a processor and a memory; the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory, so that the terminal executes any of claims 1 to 5. method described in one item.
A computer-readable storage medium with a computer program stored in the computer-readable storage medium, characterized in that when the computer program is executed by a processor, the method of any one of claims 1 to 5 is implemented.
A chip module, characterized in that the chip module is coupled to a memory and is used to execute a computer program stored in the memory to execute the method according to any one of claims 1 to 5.