CN115397003A

CN115397003A - Registration information synchronization method, device, equipment and medium

Info

Publication number: CN115397003A
Application number: CN202210994407.5A
Authority: CN
Inventors: 蔡玉婷; 李馥馨
Original assignee: Spreadtrum Semiconductor Chengdu Co Ltd
Current assignee: Spreadtrum Semiconductor Chengdu Co Ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-11-25
Also published as: WO2024037611A1

Abstract

The invention provides a registration information synchronization method, a device, equipment and a medium, wherein the method can be applied to a terminal and comprises the following steps: when a terminal is switched from a first communication system to a second communication system, sending a first tracking area updating request message to a network device of the second communication system, wherein the first tracking area updating request message comprises a first GUTI of the terminal in the first communication system; receiving a tracking area update accept message from the network device, the tracking area update accept message including a second GUTI configured for the terminal; when it is determined that the tracking area update completion message is unsuccessfully sent, triggering a set timer to start timing, and sending a second tracking area update request message to the network device after the set timer is overtime, wherein the second tracking area update request message comprises the second GUTI.

Description

Registration information synchronization method, device, equipment and medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a medium for synchronizing registration information.

Background

Current third generation partnership project (3 gpp) protocols support interoperability between fourth generation (4 g) and fifth generation (5 g) mobile communication technology systems. That is, when there are both a 5G network and a 4G network in the network environment, the terminal may switch from the 5G network to the 4G network or from the 4G network to the 5G network. 5G is a latest generation of mobile communication technology, and can provide higher data rate, lower delay, full connectivity for everything interconnection, more energy saving, lower cost, higher system capacity and large-scale device access.

When a terminal is switched from a 5G system to a 4G system, a Tracking Area Update (TAU) process generally needs to be initiated to synchronize registration information between the terminal and a network side device, but a TAU failure may cause a network drop of the terminal, which brings adverse use experiences such as incapability of using 4G system services, terminal call drop, and the like.

Therefore, it is desirable to provide a new method for synchronizing registration information to improve the probability of success of TAU procedure, so as to improve the probability of success of synchronizing registration information in a network handover scenario.

Disclosure of Invention

The invention aims to provide a method, a device, equipment and a medium for synchronizing registration information, wherein the method is used for improving the possibility of successful synchronization of the registration information in a network switching scene.

In a first aspect, the present invention provides a registration information synchronization method, which may be applied to a terminal device, and includes: when a terminal is switched from a first communication system to a second communication system, sending a first tracking area updating request message to a network device of the second communication system, wherein the first tracking area updating request message comprises a first GUTI of the terminal in the first communication system; receiving a tracking area update accept message from the network device, the tracking area update accept message including a second GUTI configured for the terminal; and when the tracking area updating completion message is determined to be failed to be sent, triggering a set timer to start timing, and sending a second tracking area updating request message to the network equipment after the set timer is overtime, wherein the second tracking area updating request message comprises the second GUTI.

The registration information synchronization method provided by the invention has the beneficial effects that: when the terminal has network switching, the terminal tries the TAU flow again by using the second GUTI allocated by the switched network, which is beneficial to improving the success possibility of the TAU flow.

In one possible implementation, the sending the second request message to the network device of the second communication system includes: determining whether a tracking area of a cell where the terminal currently resides is changed compared with a tracking area of a cell where the terminal resides when being switched to a second communication system; when the change occurs, a second request message is sent to the network device of the second communication system. In this embodiment, since the tracking area of the cell of the terminal is changed, the second GUTI allocated by the network after handover is used to try the TAU procedure again, which helps to improve the possibility of success of the TAU procedure.

In another possible embodiment, the method further comprises: and when the change does not occur, sending the first tracking area updating request message to the network equipment of the second communication system again. In this embodiment, since the tracking area of the cell of the terminal has not changed, the first GUTI is used to try the TAU procedure again, which helps to improve the possibility of success of the TAU procedure.

In other possible embodiments, the method further comprises: and when the tracking area position is detected to be updated successfully, establishing a service link with the network equipment of the second communication system. In this embodiment, when the TAU procedure is successful, the terminal may communicate with the network device in the network after handover normally.

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

In a second aspect, an embodiment of the present application provides a registration information synchronization apparatus, where each unit in the apparatus may further perform other possible design methods of the first aspect, and specifically, refer to the first aspect. These modules/units may be implemented by hardware or by hardware executing corresponding software.

In a third aspect, an embodiment of the present application provides a terminal, including a memory and a processor, where the memory stores a computer program executable on the processor, and when the computer program is executed by the processor, the electronic device is caused to perform any one of the possible design methods of the first aspect.

In a fourth aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, causes an electronic device to perform any one of the possible design methods of the first aspect.

In a fifth aspect, an embodiment of the present application further provides a chip or a chip module, where the chip is coupled to an or chip module memory, and is configured to execute a computer program stored in the memory, so that a terminal device executes any one of the possible design methods of the first aspect.

As for the advantageous effects of the above second to fifth aspects, reference may be made to the description of the above first aspect.

Drawings

Fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a PDN connection according to an embodiment of the present application;

fig. 3 is a schematic diagram of a PDU session provided in an embodiment of the present application;

fig. 4 is a schematic flowchart of a registration information synchronization method according to an embodiment of the present invention;

fig. 5 is a schematic flowchart of another registration information synchronization method according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a registration information synchronization apparatus according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

In order to make the objects, 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 describing embodiments of the present application, the terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" means one or more than two (including two). The term "and/or" is used to describe the association relationship of the associated objects, and means that there may be three relationships; for example, a and/or B, may represent: a exists singly, A and B exist simultaneously, and B exists singly, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Reference throughout 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 present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise. The term "coupled" includes both direct and indirect connections, unless otherwise noted. "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a fifth generation (5 th generation,5 g) system, or a New Radio (NR) system, or may be applied to a future communication system or other similar communication systems.

The technical scheme provided by the embodiment of the application is suitable for a scene that the terminal device is switched from the first communication system to the second communication system, wherein the first communication system and the second communication system are systems supporting different communication systems respectively, so that the first communication system can also be called a first network or a first system, and the second communication system can also be called a second network or a second system. For example, the first communication system may be a 5G communication system, and the second communication system may be a 4G communication system, where the 5G communication system may also be referred to as a 5G network or simply as a 5G system, and the 4G communication system may also be referred to as an EPS network or simply as a 4G system. It should be understood that the first communication system and the second communication system in the embodiment of the present application may also be a future communication system or other similar communication systems, and the present application is not limited thereto, and in addition, the bearer in the embodiment of the present application may also be referred to as a quality of service flow, or may be referred to by other names (unchanged functions) in the future communication system, and the present application is not limited thereto.

Referring to fig. 1, a schematic diagram of a possible network architecture in which a 5G network and an EPS network coexist is shown. The main network elements involved in the network architecture are explained below.

The EPS network may include the following network elements:

1. (radio access network, (R) AN) network element: the method and the device are used for providing a network access function for authorized terminal equipment in a specific area, and can use transmission tunnels with different qualities according to the grade of the terminal equipment, the service requirement and the like.

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

It should be noted that the "network element" may also be referred to as an entity, a device, an apparatus, a module, or the like, and the present application is not particularly limited. Also, in the present application, for convenience of understanding and explanation, a description of "network element" is omitted in some descriptions, for example, AN (R) AN network element is abbreviated as RAN, in which case the "(R) AN network element" is understood as AN (R) AN network element or AN (R) AN entity, and explanation of the same or similar cases is omitted below.

2. A Mobility Management Entity (MME) for providing mobility management functions. In addition, the MME may also provide functions such as lawful interception and access authorization/authentication.

3. A Serving Gateway (SGW) is used for providing functions such as user data forwarding.

4. A packet data network gateway user plane function (PGW-U) for providing a user plane function of a Public Data Network (PDN) gateway.

5. A packet data network gateway control plane function (PGW-C) for providing a control plane function of the PDN gateway.

6. A Policy and Charging Rules Function (PCRF) for providing a unified policy framework for guiding network behavior, providing policy and charging rules information for a control plane function network element, and the like.

7. A Home Subscriber Server (HSS) includes a subscriber profile for performing authentication and authorization of a subscriber and may provide information about the physical location of the subscriber.

The 5G network may include the following network elements:

1. (R) AN network element: the method and the device are used for providing a network access function for authorized terminal equipment in a specific area, and can use transmission tunnels with different qualities according to the grade of the terminal equipment, the service requirement and the like.

In a 5G communication system, the (R) AN network element may also be referred to as a next generation access network (NG-RAN, as shown in fig. 1) or a next generation base station (gNB).

2. Access and mobility management function (AMF), functions for access management and mobility management. In addition, the AMF may also provide functions such as lawful interception and access authorization/authentication.

In one possible design, the AMF may communicate with the MME over an N26 interface. In fig. 1, letters and numbers of the line attachments between the network elements indicate names of communication interfaces between the network elements, however, the communication interfaces between the network elements may have other names, and the present application is not limited thereto.

3. User Plane Functions (UPFs) are used for routing and forwarding packets, and quality of service (QoS) processing or execution of user plane data.

4. A Session Management Function (SMF), which is mainly used for session management, and network Interconnection Protocol (IP) address allocation and management, selection, and user plane management functions of a terminal device. The SMF may also be the termination point of the policy control and charging function interface.

5. A Policy Control Function (PCF), a unified policy framework for guiding network behavior, providing policy rule information for control plane function network elements (e.g., AMFs, SMFs, etc.), and the like.

6. A Unified Data Management (UDM) network element for managing subscription data. In addition, the method is also used for user service registration management, terminal equipment identification processing, access authentication and the like.

In the network architecture, network elements with the same or similar functions may be jointly configured or jointly deployed. For example, the UPF and the PGW-U may be combined in one device or separately deployed in different devices, the SMF and the PGW-C may be combined in one device or separately deployed in different devices, the PCF and the PCRF may be combined in one device or separately deployed in different devices, and the HSS and the UDM may be combined in one device or separately deployed in different devices.

It should be understood that the network architecture applied to the present application is only an exemplary network architecture described in the service architecture, and the network architecture to which the embodiments of the present application are applied is not limited thereto, and any network architecture capable of implementing the functions of the network elements described above is applicable to the embodiments of the present application.

The network element or the function may be a network element in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (e.g., a cloud platform).

In an EPS network, a User Equipment (UE) establishes a PDN connection (PDN connection) with the network. At least one bearer (bearer) can be established in each PDN connection, and the internal structure of the PDN connection is as shown in fig. 2, and the main features are as follows:

(1) An Access Point Name (APN) and an aggregated maximum bit rate for an access point name (APN-AMBR) in a PDN connection. The APN and the APNAMBR are obtained from the HSS by the MME in the position request process in the UE attachment process.

(2) One PDN connection is established in the process of establishing the PDN connection, and one default EPS bearer can aggregate at least one Service Data Flow (SDF); one PDN connection may also include one or more Non-guaranteed bit rate evolved packet system bearers (Non-GBR EPS bearers) created in a dedicated evolved packet system bearer (dedicated EPS bearer) establishment procedure initiated by the UE or the network side, where at least one SDF is in one Non-GBR EPS bearer, and may also aggregate one or more other SDFs; one PDN connection may also include one or more guaranteed bit rate evolved packet system bearers (GBR EPS bearers), which are created in a dedicated EPS bearer establishment procedure initiated by the UE or the network side, where at least one SDF in one GBR EPS bearer may also be aggregated with one or more other SDFs.

Where each bearer in fig. 2 has corresponding QoS parameters and is used to transport a corresponding SDF. The MME network element may allocate an EPS Bearer Identity (EBI) to each bearer, and send the EPS bearer identity to the UE in the bearer establishment process. For the default bearer, the EPS bearer identity (bearer ID) is sent to the UE during the PDN connection establishment, and for the dedicated bearer, the EPS bearer identity (bearer ID) is sent to the UE during the dedicated bearer establishment.

The Qos parameters of the default bearer and the dedicated bearer are different, and the Qos parameters corresponding to different types of EPS bearers are shown in table 1.

TABLE 1

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

(1) A corresponding DNN in a PDU Session, a PDU Session identity (PDU Session ID), and a Session aggregation maximum bit rate (Session AMBR). Wherein: DNN and SessionaMBR are obtained from UDM in the process of UE registration and AMF in the process of location request; the PDU Session ID is distributed by the SMF network element in the process of establishing the PDUSESS initiated by the UE;

(2) One and only one default QoS flow (default QoS flow) is created in the PDU session establishment process, and at least one SDF can be aggregated in one default QoS flow. One 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 in the PDU Session modification process initiated by the UE or network side. There is at least one SDF in a non-GBR QoS flow, or multiple SDFs can be aggregated. One PDU Session may also contain one or more guaranteed bit rate evolution packet system quality of service flows (GBR QoS flows), which are created in a PDU Session modification process initiated by the UE or the network side, where one GBR QoS flow has at least one SDF, or multiple SDFs may be aggregated.

Each QoS flow in fig. 3 has a corresponding QoS parameter and is used for transmitting a corresponding traffic data flow. The SMF network element will assign a quality of service flow identification (QoS flow ID, QFI) to each QoS flow and send the QFI to the UE. For the default quality of service flow, QFI is sent to the UE during PDU session establishment, and for the dedicated quality of service flow, QFI is sent to the UE during dedicated quality of service flow establishment.

The Qos parameters of the default Qos flows are different from the Qos parameters of the dedicated Qos flows, and the Qos parameters corresponding to different types of Qos flows are shown in table 2.

TABLE 2

In the embodiments of the present application, the QoS parameters in table 1 and table 2 are merely illustrative. The QoS parameters may include one or more of the above parameters, and the embodiments of the present application are not limited thereto.

In summary, in the interworking between a Long Term Evolution (LTE) network and a 5G network, a PDU session corresponds to a PDN connection, and an EPS bearer corresponds to a QoS flow, and specifically, the correspondence is as shown in table 3.

TABLE 3

In this embodiment, a User Equipment (UE) may also be referred to as a terminal equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a smart printer, a train detector, a gas station detector, a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios.

As can be seen from the network architecture shown in fig. 1, in the scenario where the 5G network and the EPS network coexist as shown in fig. 1, the terminal device may move (including handover or redirection) from the 4G communication system to the 5G communication system, or may also move (including handover or redirection) from the 5G communication system to the 4G communication system.

In the LTE system, a concept of a Tracking Area (TA) is proposed in order to facilitate location management of a terminal. TA is defined as a free mobility area where the terminal does not need to update the service. Therefore, when the terminal moves from one TA to another TA, the location registration needs to be performed again on the new TA to notify the network device to change the stored registration information of the terminal, which is Tracking Area Update (TAU). In the process of the UE performing TAU, there are many involved network elements, for example: an evolved Node b (e-Node, eNB), an MME, a Serving GateWay (SGW), a Home Subscriber Server (HSS), a Home Location Register (HLR), and the like.

As shown in fig. 4, a registration information synchronization method is provided for the embodiment of the present application, and the method includes:

s401, the terminal is switched from the first communication system to the second communication system.

S402, the terminal sends a first tracking area updating request message to the second communication system.

Wherein the first Tracking Area Update Request message (TAU Request) includes a first Globally unique temporary identifier (Globally unique identifier, GUTI) of the terminal in the first communication system.

S403, the second network sends a tracking area update accept message to the terminal.

Wherein, the Tracking Area Update Accept message (TAU Accept) includes a second GUTI configured for the terminal.

S404, the terminal determines that the transmission of the tracking area updating completion message fails, and triggers a set timer to start timing.

S405, after the timer expires, sending 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 registration information of the terminal stored in the network device according to the second request message.

Optionally, before executing S403, the following determination is also executed: when the terminal determines that a Tracking Area (TA) of a cell where the terminal resides currently changes compared with a TA of the cell where the terminal resides when the terminal is switched to the second communication system through cell signal measurement, the terminal sends a second request message to a second network; and when the terminal determines through cell signal measurement that the TA of the cell which resides at present is the same as the TA of the cell which resides when the terminal is switched to the second communication system, the terminal sends the first request message to the second network again, and then the network equipment of the second network updates the registration information of the terminal, which is stored by the network equipment, according to the first request message.

In a possible implementation manner, when the terminal detects that the location of the tracking area is updated successfully, the terminal establishes a service link with the network device of the second communication system, and then the terminal obtains a communication service in the switched second communication system.

Hereinafter, taking an example that the first communication system is a 5G system and the second communication system is a 4G system, that is, the UE is switched from the 5G network to the LTE network, the registration information synchronization method is systematically illustrated, as shown in fig. 5, the method includes the following steps:

s501, the UE is switched to the LTE network from the 5G network.

S502, when the UE switches from the 5G network to the LTE network, the UE sends a first TAU request (request) message to a network device of the LTE network, where the first TAU request message includes a first GUTI.

In this step, the TAU Request message may be transmitted from a Non-Access Stratum (NAS) of the LTE of the UE.

S503, the network device of the LTE network returns a TAU accept (accept) message to the UE, where the TAU accept message includes the second GUTI configured for the terminal.

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

S505, the UE determines that the sending of the TAU completion message fails, and the UE starts a T3411 timer with the duration of 10S.

After the UE fails the TAU for the previous time, triggering a first timer to start timing; during the timing of the first timer, the UE is in a state of trying to register and update the tracking area position, but stops sending a tracking area position update Request (TAU Request); after the first timer is overtime, the UE retransmits the TAU Request to perform TAU.

S506, when T3411 is overtime, the UE determines whether the TA of the cell where the UE camps changes compared with the TA of the cell where the UE camps handed over to the LTE network, if yes, S507 is executed, otherwise S508 is executed.

S507, if the TA of the cell where the UE resides is changed from the TA of the cell where the UE resides when the UE is switched to the LTE network, the UE sends a second GUTI to try the TAU procedure again.

S508, if the TA of the cell where the UE resides is not changed compared with the TA of the cell where the LTE network resides, 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.

And then, waiting for the TAU to be successful, realizing the synchronization of the UE and the registration information of the LTE network, and enabling the UE to establish a service link with the network equipment of the LTE network, wherein the registration information at least comprises TA information of the UE, and the registration information also comprises a GUTI allocated to the UE by the network equipment, a request for establishing user plane resources by the UE and the like.

It should be appreciated that there are numerous reasons for failure of the UETAU, such as: failure of the bottom layer, timeout of a timer, TAU rejection caused by EPS Mobility Management (Evolved Packet System-Mobility Management, EMM), and the like.

In order to implement each function in the communication method provided in the embodiment of the present application, the terminal may include a hardware structure and/or a software module, and implement each function in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.

The same concept as that of the foregoing embodiments, the embodiments of the present application further provide a registration information synchronization apparatus, where the registration information synchronization apparatus 600 is configured to implement the function of the terminal in the foregoing method. The registration information synchronization apparatus 600 may be a terminal, or an apparatus in a terminal device. The apparatus may be a system-on-chip in a terminal. In the embodiment of the present application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.

In one example, as shown in fig. 6, the registration information synchronization apparatus 600 includes a transmitting unit 601 and a receiving unit 602.

A sending unit 601, configured to send a first tracking area update request message to a network device of a second communication system when a terminal is handed over from a first communication system to the second communication system, where the first tracking area update request message includes a first globally unique temporary identifier GUTI of the terminal in the first communication system;

a receiving unit 602, 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;

the sending unit 601 is further 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 send a second tracking area update request message to the network device of the second communication system after the set timer expires, where the second tracking area update request message includes a second GUTI of the terminal in the second communication system.

The apparatus further comprises a processing unit 603 for: and when the tracking area position is detected to be updated successfully, carrying out service transmission with the network equipment of the second communication system.

For the specific implementation and beneficial effects of the above units, see the description in the method related to fig. 4 above.

The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

In yet another example, as shown in fig. 7, the terminal includes at least one processor 710 and memory 720. The memory 720 stores therein a computer program. A memory 720 is coupled to the processor 710. The coupling in the embodiments of the present application is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, and is used for information interaction between the devices, units or modules. As another implementation, the memory 720 may also be located outside of the communication device 700. The processor 710 may operate in conjunction with the 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, communications apparatus 700 may also include a communications interface 730 for communicating with other devices over a transmission medium, such that the apparatus used in communications apparatus 700 may communicate with other devices. Illustratively, the communication interface 730 may be a transceiver, circuit, bus, module, or other type of communication interface, which may be other terminals. The processor 710 utilizes the communication interface 730 to send and receive information and is used to implement the methods in the embodiments described above. Illustratively, communication interface 730 is configured to receive resource indicator information. Also exemplary, communication interface 730 is used for transmitting data.

In the embodiments of the present 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, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example. The memory is 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, but is not limited to such. The memory in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function for storing a computer program and/or data.

The method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, 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. The procedures or functions according to the embodiments of the present invention are wholly or partially generated when the computer program is loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any medium that can be accessed by a computer or a data storage device, including one or more media integrated servers, data centers, and the like. The medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disc (DVD), for short), or a semiconductor medium (e.g., an SSD), etc.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A registration information synchronization method is applied to a terminal and comprises the following steps:

when a terminal is switched from a first communication system to a second communication system, sending a first tracking area updating request message to a network device of the second communication system, wherein the first tracking area updating request message comprises a first Global Unique Temporary Identifier (GUTI) of the terminal in the first communication system;

receiving a tracking area update accept message from the network device, the tracking area update accept message including a second GUTI configured for the terminal;

and when the tracking area updating completion message is determined to be failed to be sent, triggering a set timer to start timing, and sending a second tracking area updating request message to the network equipment after the set timer is overtime, wherein the second tracking area updating request message comprises the second GUTI.

2. The method of claim 1, wherein sending the second request message to the network device of the second communication system comprises:

determining whether a tracking area of a cell in which the terminal currently resides is changed compared with a tracking area of a cell in which the terminal resides when being switched to a second communication system;

when the tracking area changes, a second request message is sent to the network device of the second communication system.

3. The method of claim 2, further comprising:

and when the tracking area is not changed, sending the first tracking area updating request message to the network equipment of the second communication system again.

4. The method of any of claims 1 to 3, further comprising:

and when the tracking area position is detected to be updated successfully, establishing a service link with the network equipment of the second communication system.

5. The method according to any one of claims 1 to 3, wherein when the first communication system is a 5G system, the second communication system is a 4G system.

6. A registration information synchronization apparatus, comprising:

a sending unit, configured to send a first tracking area update request message to a network device of a second communication system when a terminal is handed over from a first communication system to the second communication system, where the first tracking area update request message includes a first global 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;

the sending unit is further 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 send a second tracking area update request message to the network device of the second communication system until the set timer expires, where the second tracking area update request message includes a second GUTI of the terminal in the second communication system.

7. The apparatus according to claim 6, wherein the sending unit sends the second request message to the network device of the second communication system, specifically to:

8. The apparatus of claim 7, wherein the sending unit is further configured to:

9. The apparatus according to any of claims 6 to 8, further comprising a processing unit for:

and when the tracking area position is detected to be updated successfully, carrying out service transmission with the network equipment of the second communication system.

10. The apparatus according to any one of claims 6 to 8, wherein when the first communication system is a 5G system, the second communication system is a 4G system.

11. A terminal comprising a processor and a memory; the memory is used for storing a computer program; the processor is configured to execute the computer program stored in the memory to cause the terminal to perform the method of any one of claims 1 to 5.

12. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 5.

13. A chip module, characterized in that the chip module is coupled with a memory for executing a computer program stored in the memory for performing the method according to any of claims 1 to 5.