CN115103347B - Tracking area updating method, device, electronic equipment and computer readable storage medium - Google Patents

Abstract

The application relates to a tracking area updating method, a tracking area updating device, electronic equipment and a computer readable storage medium. The method comprises the following steps: in the process of performing TAU by the UE, if cell switching occurs, judging whether the tracking area of the target cell is consistent with the tracking area of the source cell; and if the tracking area of the target cell is consistent with the tracking area of the source cell, sending a first tracking area updating request to the MME. The content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU. The method can improve the updating efficiency of the tracking area and the success rate of the called party.

Description

Tracking area updating method, device, electronic device and computer readable storage medium

Technical Field

The present application relates to the field of communications, and in particular to a tracking area updating method, device, electronic device and computer-readable storage medium.

Background technique

When the location of the user equipment (UE) is switched from the old cell to the new cell, and the tracking area information of the new cell is inconsistent with the information in the tracking area list of the old cell, the UE sends a Tracking Area Update Request to the Mobility Management Entity (MME) to complete the Tracking Area Update process through the MME. During the Tracking Area Update (TAU) process, if a handover occurs between base stations, the TAU will fail, which may cause the UE to be unable to receive the paging message or CsService Notification message sent by the core network.

In the related technology, during the TAU process through the MME, if a handover occurs between base stations and the UE does not receive the tracking area update request sent by the MME, the MME can only wait for a period of time (6S) before retransmitting the tracking area update message in the target cell, or the UE needs to wait for a longer time (25s) before resending the TAUR to the mobile management entity.

However, the related art method results in low tracking area update efficiency.

Summary of the invention

Embodiments of the present application provide a tracking area update method, device, electronic device, and computer-readable storage medium, which can improve the tracking area update efficiency.

A tracking area updating method, the method comprising:

During the UE TAU process, if a cell handover occurs, determine whether the tracking area of the target cell is consistent with the tracking area of the source cell;

If the tracking area of the target cell is consistent with the tracking area of the source cell, a first tracking area update request is sent to the MME; the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU.

A tracking area updating method, the method comprising:

receiving a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell switch occurs during a TAU, and the second tracking area update request is sent when the UE triggers a TAU;

If the content of the first tracking area update request is the same as the content of the second tracking area update request, a tracking area update message is sent.

A tracking area updating device, the device comprising:

A first judgment module is used to judge whether the tracking area of the target cell is consistent with the tracking area of the source cell if a cell handover occurs during the UE performing TAU;

The first sending module is used to send a first tracking area update request to the MME when the tracking area of the target cell is consistent with the tracking area of the source cell; the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU.

A tracking area updating device, the device comprising:

The third receiving module is used to receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell switch occurs during a TAU, and the second tracking area update request is sent when the UE triggers a TAU;

The third sending module is used to send a tracking area update message if the content of the first tracking area update request is the same as the content of the second tracking area update request.

An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the computer program is executed by the processor, the processor executes the steps of the tracking area update method described in any one of the above method embodiments.

A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of any one of the methods described in the above method embodiments are implemented.

A computer program product includes a computer program, wherein when the computer program is executed by a processor, the steps of any one of the methods described in the above method embodiments are implemented.

The above-mentioned tracking area update method, device, electronic device, and computer-readable storage medium, during the process of UE performing TAU, if a cell handover occurs, determine whether the tracking area of the target cell is consistent with the tracking area of the source cell; if the tracking area of the target cell is consistent with the tracking area of the source cell, send a first tracking area update request to the MME. The content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU. In this process, the UE does not need to wait for the tracking area update message sent by the MME. When the tracking areas of the source cell and the target cell are consistent, the UE can immediately resend the tracking area update request to the MME. Compared with the prior art, the UE does not need to wait for 25 seconds to resend the tracking area update request to the MME, which shortens the time of sending the tracking area update request twice, improves the tracking area update efficiency, can greatly shorten the time of message loss, and improves the UE's call success rate.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a diagram showing an application environment of a tracking area update method according to an embodiment;

FIG2 is a flow chart of a tracking area update method according to an embodiment;

FIG3 is a flow chart of a tracking area update method in one embodiment;

FIG4 is a flow chart of an X2 handover process in one embodiment;

FIG5 is a flow chart of an S2 switching process in one embodiment;

FIG6 is a flowchart of an MME sending a paging message to a UE in one embodiment;

FIG. 7 is a flow chart of a called party initiating CSFB from an MME to a UE in one embodiment;

FIG8 is a flow chart showing a TAU failure causing paging loss in one embodiment;

FIG9 is a flow chart of a tracking area update method according to an embodiment;

FIG10 is a flow chart of a tracking area update method according to an embodiment;

FIG11 is a flow chart of a tracking area update method according to an embodiment;

FIG12 is a flow chart of a tracking area update method according to an embodiment;

FIG13 is a flow chart of a tracking area update method according to an embodiment;

FIG14 is a flow chart of a tracking area update method according to an embodiment;

FIG15 is a flow chart of a tracking area update method according to an embodiment;

FIG16 is a flow chart of a tracking area update method according to an embodiment;

FIG17 is a flow chart of a tracking area update method according to an embodiment;

FIG18 is a block diagram of a tracking area update apparatus according to an embodiment;

FIG19 is a block diagram of a tracking area update apparatus according to an embodiment;

FIG20 is a block diagram of an electronic device according to an embodiment;

FIG. 21 is a block diagram of the structure of an electronic device in one embodiment.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

The tracking area update method provided in the embodiment of the present application can be applied in the application environment shown in FIG1. The application environment includes a user equipment 100, a source base station 200, a target base station 300 and a mobile management entity 400. The user equipment 100 communicates with the source base station 200 and the target base station 300 through a network, and the source base station 200 and the target base station 300 communicate with the mobile management entity 400 through a network. The user equipment 100 can be a wireless terminal, which can be a device that provides voice and/or other business data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The wireless terminal can be a mobile terminal, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device, which exchanges language and/or data with a wireless access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA) and other devices. The source base station 200 and the target base station 300 can be base stations (Base Transceiver Station, BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA), or base stations (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), or evolutionary Node B (eNodeB) in LTE, or relay stations or access points, or base stations in 5G networks, etc., which are not limited here.

First of all, before specifically introducing the technical solution of the embodiments of the present application, the technical background based on the embodiments of the present application is introduced.

FIG2 is a schematic diagram of the tracking area update process. In FIG2, the tracking area update process can be represented as follows: the UE sends a tracking area update request to the MME. After receiving the tracking area update request, the MME judges the tracking area update request and sends a tracking area update message to the UE within a preset time or rejects the tracking area update message (Tracking Area Update Request Reject). After the UE receives the tracking area update message sent by the MME, the UE sends a tracking area update complete message (Tracking Area Update Request Complete) to the MME, indicating that the tracking area update process has been completed; when the UE receives the tracking area update rejection message sent by the MME, the UE does not need to send a message to the MME, indicating that the tracking area update process has failed, and the UE needs to resend the tracking area update request to the MME and initiate the TAU process again.

In the prior art, during the TAU process, when the UE switches from the source cell to the target cell, the MME sends a tracking area update message to the source base station corresponding to the source cell, and forwards it to the UE through the source base station, or forwards it to the target base station through the source base station, and forwards it to the UE through the target base station. Figure 3 is a flow chart of the tracking area update method in the prior art. In Figure 3, the UE enters a cell A in an idle state, and the tracking area (Tracking Area, TA) of the cell A is not in the tracking area list of the previous cell. The UE sends a tracking area update request to the MME. When the UE confirms receipt of the tracking area update message, the UE has not sent a tracking area update completion to the MME. The base station initiates a handover. After the user equipment switches to the B cell, the UE sends a tracking area update completion to the MME, and the tracking area update process is completed. When the UE does not receive the tracking area update message, the base station initiates a handover, and the UE determines whether the tracking areas of the A cell and the B cell are consistent. When the tracking areas of the A cell and the B cell are inconsistent, the UE re-initiates the TAU process; when the tracking areas of the A cell and the B cell are consistent, the UE determines whether the B cell immediately receives the tracking area update message. When the B cell immediately receives the tracking area update message, the UE sends a tracking area update completion message to the MME in the B cell. Next, enter the processing flow of branch A: When the B cell does not receive the tracking area update message immediately, and receives the tracking area update message retransmitted by the MME after 6 seconds, the UE sends a tracking area update completion message to the MME in the B cell. When the UE does not receive the tracking area update message in the B cell within 6 seconds, the UE needs to wait for 25 seconds before sending a tracking area update request to the MME. Among them, the UE needs to wait for 15 seconds to determine whether it has received the tracking area update message sent by the MME. If the UE does not receive the tracking area update message sent by the MME within 15 seconds, the UE needs to wait for 10 seconds before sending a tracking area update request to the MME. The 25 seconds that the UE waits and the 6 seconds that the MME waits can be timed by a timer to ensure the accuracy of the waiting time. Next, enter the processing flow of branch B: MME confirms whether the tracking area update request is received. If so, MME sends a tracking area update message to the UE, and the UE sends a tracking area update completion message to the MME in cell B. Next, enter the processing flow of branch C: If the MME confirms that it has not received the tracking area update request, the MME sends a tracking area update rejection to the UE, and carries the rejection reason, and the UE initiates the registration process. For example, the MME replies Tracking area update reject, and carries the rejection reason in Tracking area update reject. For example, the rejection reason can be #10 Implicitly detached. At this time, the UE side will cause the call to drop, and it is necessary to re-initiate the attach.

When the UE switches from the source cell to the target cell, the UE sends a measurement report to the source base station. After receiving the measurement report sent by the UE, the source base station switches to the target base station. The switching within the system in the Long Term Evolution (LTE) network includes two switching modes, namely X2 switching and S1 switching.

FIG4 is a flowchart of the X2 handover process. X2 handover means that when the UE is in a connected state, the UE switches from a cell of a certain base station to a cell of another base station, and an X2 interface exists and is configured between the two base stations. The basic idea of X2 interface handover is: after the source base station receives the measurement report of the UE, the source base station receives the measurement result reported by the UE, and makes a handover decision according to its own handover algorithm. After the handover decision is made, a handover request (Handover Request) is sent to the target base station. After the target base station receives the Handover Request, it starts the L1/L2 handover preparation and sends a handover confirmation (Handover Request Ack) message to the source base station. After the source base station receives the Handover Request Ack, it sends a handover command (Handover Command) to the UE through a signaling radio resource control connection reconfiguration (RRC Connection Reconfiguration) message. The handover command carries an RRC connection reconfiguration message containing mobility control information. The source base station sends a sequence number status transfer message (Sequence Number Status Transfer) to the target base station. The target base station sends a path switch request message (Path Switch Request) to the MME to inform the MME that the UE has changed cells, and the MME sends a path switch confirmation message (Path Switch Request Ack) to the target base station to inform the target base station that the path switch is completed.

During the X2 handover process, the MME does not know that the UE is handing over. The MME normally processes the TAU process initiated by the UE and sends a tracking area update message to the UE. When the UE initiates the TAU process before receiving the Handover Command and receives the Handover Command before the MME successfully sends the Tracking Area Update message, the following problems exist:

(1) When the MME sends the tracking area update message to the source base station, and the source base station forwards the tracking area update message to the UE, if the UE fails to receive the tracking area update message, the MME will not retransmit the tracking area update message in the target cell through HARQ and RLC ARQ. The MME needs to wait for 6 seconds before retransmitting the tracking area update message in the target cell.

(2) After sending the handover command, the source base station receives the tracking area update message. If the source base station can forward the tracking area update message to the target base station, the TAU process can proceed normally. If the source base station cannot forward the tracking area update message to the target base station, the MME can only wait for 6 seconds to time out and retransmit the tracking area update message in the target cell;

(3) The MME sends a tracking area update message during the handover process and cannot retransmit the tracking area update message. The UE can only re-initiate a tracking area update request after a 25-second timeout.

(4) In another case, the MME may not be able to process the tracking area update request sent by the UE after T3411 times out. The MME considers that the TAU has failed and has released the UE context. The MME replies with Tracking area update reject with reason #10 Implicitly detached. The UE needs to re-initiate attach according to the failure reason, resulting in the UE dropping the call during the call. The above rejection reasons can be #22, #28, #65, #67, or #90, #91, etc.

Figure 5 is a flowchart of the S2 handover process. S2 handover means that when the UE is in a connected state, the UE switches from a cell of a certain base station to a cell of another base station, and no X2 interface is configured between the two base stations. The basic idea of S2 interface handover is: after the source base station receives the measurement report of the UE, the source base station receives the measurement results reported by the UE, and makes a handover decision based on its own handover algorithm. After the handover decision is made, a handover request Handover Request is sent to the MME, and the MME forwards the Handover Request to the target base station. After the target base station receives the Handover Request, it starts the L1/L2 handover preparation and sends a handover confirmation Handover Notify message to the MME. After the MME receives the Handover Notify, the MME sends a Handover Command to the source base station. The source base station sends a handover command Handover Command to the UE through an RRC Connection Reconfiguration message. The UE sends a Handover Complete message to the target base station through an RRC Connection Reconfiguration Complete message.

During the S2 handover process, the MME knows that the UE has undergone a cell handover during the TAU process. The MME needs to negotiate the handover with the target base station. The TAU process initiated by the UE occurs at the NAS layer. The S1 handover occurs at the S1 interface. The following problems exist:

(1) After the S1 handover is completed, the MME sends a tracking area update message to the target base station, and the process can be processed normally;

(2) The MME sends a tracking area update message to the source base station. Since there is no X2 interface between the source base station and the target base station, the source base station cannot forward the tracking area update message to the target base station. The MME needs to wait for 6 seconds to retransmit the tracking area update message to the target base station.

(3) The MME sends a tracking area update message to the source base station. Since there is no X2 interface between the source base station and the target base station, the source base station cannot forward the tracking area update message to the target base station. At the same time, the MME cannot resend the tracking area update message on the target cell. The UE needs to wait for 25 seconds and then resend the tracking area update request to the MME.

(4) In another case, the MME may not be able to process the tracking area update request sent by the UE after T3411 times out. The MME considers that the TAU has failed and has released the UE context. The MME replies with a Tracking area update reject with the reason #10 Implicitly detached. The UE needs to re-initiate attach based on the failure reason, resulting in the UE dropping the call during the call.

In the prior art, if the UE does not receive the tracking area update message sent by the MME, the MME needs to wait for 6 seconds to retransmit the tracking area update message to the target base station, or the UE needs to wait for 25 seconds to re-initiate the tracking area update request. This process may cause the UE to be unable to receive the idle paging or calling call signaling (CS service noification) sent by the network within a certain period of time.

FIG6 is a flowchart showing the MME sending a paging message to the UE. When the UE is in an idle state, the MME will send a paging message to all base stations belonging to the TA registered by the UE. However, because the UE has not successfully registered with the TA of the target base station, the target base station will not receive the paging and the UE will lose the paging.

Figure 7 shows the called process flow chart of MME initiating CSFB to UE. When UE is in connected state, the external called request Initial Address Message will be sent to the mobile service switching center (Master of Science, MSC) where the location area code (LAC) registered by UE is located, and then MSC sends it to the corresponding MME. When the TAU process fails, it will cause the registration failure of the source cell corresponding to the tracking area code (Tracking area code of cell served by neighbor Enb, TAC), and the called request will be sent to the MSC of the TA corresponding to the previous TAC. The MSC will find the previous MME, resulting in the UE not receiving the CS service notification.

FIG8 is a flowchart of paging loss caused by TAU failure. When the UE enters branch A or branch B in FIG3, it is determined whether the network releases the UE. If the network releases the UE and the UE enters the idle state, the MME has sent a tracking area update message, but the UE has not received the tracking area update message. In the above process, since the tracking area update of the UE is unsuccessful, any paging of the UE will be sent to the previous TA. After the UE waits for 25 seconds, it resends the tracking area update request to the MME. The UE cannot receive paging within 25 seconds. If the network does not release the UE, and the new tracking area update has a new location area code, when the UE is in the connected state, when the MME initiates a CSFB call to the UE, since it is not registered in the new LAC of the MSC, the paging message will be sent to the previous tracking area. If the UE enters branch A in FIG3, the MME needs to wait for 6 seconds, and the MME resends the tracking area update message in the target cell. The UE cannot receive calls in the CS domain within 6 seconds. If the UE enters branch B from branch A in FIG. 3 , the UE re-initiates a new TAU after 25 seconds, and the UE cannot receive a call in the CS domain within 25 seconds.

In one embodiment, as shown in FIG. 9 , a tracking area update method is provided, which is described by taking the method applied to the UE in FIG. 1 as an example, including the following steps:

S901: When a cell handover occurs during a UE TAU, it is determined whether the tracking area of the target cell is consistent with the tracking area of the source cell.

Among them, the tracking area includes the location area and the routing area. The tracking area refers to the area used by the network to determine the location of the UE. When the UE is in an idle state, the network can know the TA where the UE is located; when the UE in an idle state is paged by the network, the network must page in all cells of the TA registered by the UE. Tracking area update refers to the process when the UE enters a new cell and the TA of the cell is not in the registered TA. The UE needs to initiate a TAU to the MME to register the TA of the new cell. The above-mentioned cell switching means that when the UE is in a connected state, due to moving between different cells, the UE needs to complete the UE context switching and update process through a series of signaling processes.

During the UE TAU process, cell switching occurs before the UE receives the tracking area update message sent by the MME. For example, take cell A as the source cell and cell B as the target cell. When the UE enters cell A from the idle state, during the TAU process of cell A, cell A does not receive the tracking area update message sent by the MME, and the UE switches from cell A to cell B. It is necessary to determine whether the tracking areas of cell A and cell B are consistent.

During the tracking area update process, the UE can send a tracking area update request to the base station, and the base station forwards the tracking area update request to the MME. The MME can determine the target cell for the tracking area update through the base station.

In this embodiment, during the process of UE performing TAU, if cell switching occurs, the UE sends measurement reports to the source base station and the target base station respectively. After the source base station and the target base station receive the measurement reports, the source base station and the target base station respectively send system messages to the UE. The UE can obtain the tracking area message of the source cell and the tracking area information of the target cell from the system message, and match the obtained tracking area message of the source cell with the tracking area information of the target cell. If the similarity between the tracking area message of the source cell and the tracking area information of the target cell is greater than a preset threshold, it is determined that the tracking area of the target cell is consistent with the tracking area of the source cell; if the similarity between the tracking area message of the source cell and the tracking area information of the target cell is less than or equal to the preset threshold, it is determined that the tracking area of the target cell is inconsistent with the tracking area of the source cell.

S902: If the tracking area of the target cell is consistent with the tracking area of the source cell, a first tracking area update request is sent to the MME; the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU.

In this embodiment, the tracking area update request carries the identification information of the cell before the handover, and the source cell of the tracking area update can be determined by the identification information in the tracking area update request. The identification information can be the location area identification information, routing area identification information or keyword identification information of the source cell.

When the TAU is triggered, the UE sends a tracking area update request to the MME. If the UE does not receive the tracking area update message corresponding to the tracking area update request, and the UE switches from the source cell to the target cell, and the tracking areas of the source cell and the target cell are consistent, the UE sends a tracking area update request to the MME again. For example, with cell B as the source cell and cell C as the target cell, when the UE enters cell B from cell A, the UE sends a tracking area update request to the MME in cell B, and the UE does not receive the tracking area update message corresponding to the tracking area update request. When the UE switches from cell B to cell C again, and the tracking area information of cell B and cell C are consistent, the UE sends a tracking area update request to the MME again. The UE does not need to wait for the MME to send the tracking area update message, and immediately sends the tracking area update request again, which reduces the waiting time on the UE side and improves the tracking area update efficiency.

In the above tracking area update method, when the UE performs TAU, if a cell handover occurs, it is determined whether the tracking area of the target cell is consistent with the tracking area of the source cell; if the tracking area of the target cell is consistent with the tracking area of the source cell, a first tracking area update request is sent to the MME. Since the tracking areas of the source cell and the target cell are consistent, the UE can immediately resend the tracking area update request to the MME. Compared with the prior art, the UE does not need to wait for the tracking area update message resent by the MME after 6S, or the UE does not need to wait for 25s to resend the tracking area update request to the MME, which shortens the time of sending the tracking area update request twice, improves the tracking area update efficiency, can greatly shorten the time of message loss, and improves the UE's call success rate.

In another embodiment, after the UE sends the tracking area update request, it can receive a tracking area update message sent by the MME. Therefore, based on the above embodiment, the above method can also include: receiving a tracking area update message sent by the MME; the tracking area update message is sent by the MME after determining that the content of the first tracking area update request is the same as the content of the second tracking area update request.

The tracking area update message refers to a response message of the MME to the tracking area update request after the MME receives the tracking area update request sent by the UE.

Since the contents of the tracking area update requests sent twice by the UE are consistent, after receiving the two tracking area update requests, the MME determines that the contents of the two tracking area update requests are consistent, and then sends a tracking area update message to the UE. Optionally, the MME can send the tracking area update message to the target base station, and forward it to the UE through the target base station, that is, the UE can receive the tracking area update message sent by the target base station. Optionally, the MME can send the tracking area update message to the source base station, and forward it to the target base station through the source base station, and then the target base station forwards the tracking area update message to the UE, that is, the UE can receive the tracking area update message sent by the target base station. This embodiment does not limit the method for receiving the tracking area update message sent by the MME.

In the above tracking area update method, if a cell handover occurs during the TAU process, the UE sends a tracking area update request to the MME, receives a tracking area update message sent by the MME, and determines that the TAU process of the target cell has been completed according to the tracking area update message. During the TAU process, after the UE sends a tracking area update request twice, if the MME determines that the contents of the two tracking area update requests are the same, it sends a tracking area update message to the UE. The MME only needs to process one tracking area update request during the process, so that the UE can quickly receive the tracking area update message corresponding to the tracking area update request, thereby improving the efficiency of the TAU process.

FIG10 is a flow chart of a tracking area update method provided in an embodiment of the present application. This embodiment relates to an optional implementation method of how to determine that a cell switching occurs during a TAU of a UE. Based on the embodiment of FIG9 above, as shown in FIG10, the method may further include the following steps:

S1001, obtaining a value of a preset first variable.

In this embodiment, since the states of the non-access stratum (NAS) and the radio resource control layer (RRC) in the UE are not synchronized, it is necessary to set a preset first variable (TAUOngoing), and the UE determines whether a cell switch occurs during the TAU process of the UE through the value of TAUOngoing. Among them, the value of the preset first variable can be a first value. If the value of the preset first variable is the first value, the UE undergoes a cell switch during the TAU process. For example, the value of TAUOngoing can be set to 1 or 0. If the value of the first variable is 1, it indicates that a cell switch occurs during the TAU process of the UE; if the value of the first variable is 0, it indicates that no cell switch occurs during the TAU process of the UE. Alternatively, the value of the first variable can also be True or False, True indicates that a cell switch occurs during the TAU process of the UE, and False indicates that no cell switch occurs during the TAU process of the UE, which is not limited in the embodiments of the present application.

S1002: If the value of the first variable is the first value, it is determined that a cell switching occurs during the TAU process of the UE.

In this embodiment, when the value of the first variable is the first value, the UE enters the source cell from the idle state, the TA of the source cell is not in the TA of the previous cell, the UE sends a tracking area update request to the MME, and the UE performs a TAU process. When the value of the first variable is the first value, it is determined that the UE has not received the tracking area update message, and the source cell switches to the target cell.

In the above tracking area update method, the UE obtains the value of the preset first variable, and if the value of the first variable is the first value, it is determined that the UE has a cell switch during the TAU process. In this method, the UE can quickly determine whether the UE has a cell switch during the TAU process through the value of the first variable, shortening the judgment time of the UE, so that the judgment speed on the UE side is faster, and improving the tracking efficiency of the tracking area.

FIG11 is a flow chart of a tracking area update method provided in an embodiment of the present application. This embodiment relates to an optional implementation of how to determine whether the tracking area of the target cell is consistent with the tracking area of the source cell. Based on the embodiment of FIG9 above, as shown in FIG11, the method may further include the following steps:

S1101, sending a measurement report to a source base station corresponding to a source cell; the measurement report is used to instruct the source base station to switch with a target base station corresponding to a target cell.

In this embodiment, since the switching between base stations is triggered by the measurement report, the switching between base stations is triggered when the UE sends the measurement report, and the switching between base stations is not triggered when the UE does not send the measurement report. The UE can also delay sending the measurement report to delay triggering the switching between base stations.

The source base station sends a measurement control message to the UE. After receiving the measurement control message, the UE generates a measurement report based on the measurement control message. The UE sends the measurement report to the source base station. The source base station executes the H0 decision process. The source base station sends a handover request message (Handover Request) to the target base station. The target base station returns a handover confirmation message (Handover Request Ack) to the source base station. The handover process between the source base station and the target base station is completed.

FIG12 is a flow chart of a tracking area update method provided in an embodiment of the present application. This embodiment relates to an optional implementation method of sending a measurement report to a source base station corresponding to a source cell. Based on the embodiment of FIG11 above, as shown in FIG12, the above S1101 may include the following steps:

S1201, obtain the value of a preset second variable and the current rate of the UE.

In this embodiment, it is necessary to set a preset second variable (TAUOngoing) to determine the timing when the UE sends a measurement report to the base station, and the UE determines whether the UE sends a measurement report to the base station through the value of TAUOngoing. Among them, the value of the preset second variable may include a second value, and if the value of the preset second variable is the second value, the UE sends a measurement report to the base station. For example, the value of TAUOngoing can be set to 1 or 0. If the second value of the second variable is 1, it means that the UE does not send a measurement report to the base station temporarily; if the second value of the second variable is 0, the UE can send a measurement report to the base station. Alternatively, the value of the second variable can also be True or False, True indicates that the UE does not send a measurement report to the base station temporarily, and False indicates that the UE can send a measurement report to the base station, which is not limited in the embodiments of the present application.

Optionally, the UE may obtain the current speed of the UE through a built-in speed sensor. Optionally, the UE may also obtain the moving distance and moving time of the UE, and obtain the current speed of the UE according to a speed calculation formula. This embodiment does not limit the method for obtaining the current speed of the UE.

S1202: If the value of the second variable is the second value and the current rate is less than the preset rate threshold, after the TAU is completed, the value of the second variable is modified to a third value, and a measurement report is sent to the source base station.

In this embodiment, the UE compares the current rate with the preset rate threshold. If the current rate is greater than the preset rate threshold, the UE is in a high-speed state; if the current rate is less than or equal to the preset rate threshold, the UE is in a medium-speed or low-speed state. When the UE is in a high-speed state, the UE delays reporting the measurement report in the high-speed state, which will cause the deterioration of the wireless environment. The solution provided in this embodiment cannot be applied to the high-speed state, but only to the medium-speed or low-speed state.

When the UE is in medium or low speed state, if the value of TAUOngoing is 1, it is determined that the UE will not send measurement reports to the base station temporarily. After the UE receives the tracking area update message sent by the MME and then sends the tracking area update completion message to the MME, the TAU process is completed. When the UE changes the value of TAUOngoing to 0, the UE sends the measurement report to the source base station. After receiving the measurement report, the source base station switches to the target base station, completing the switch from the source base station to the target base station.

In the above tracking area update method, the UE obtains the value of the preset second variable and the current rate of the UE. If the value of the second variable is the second value and the current rate is less than the preset rate threshold, the value of the second variable is modified to the third value after the TAU is completed, and a measurement report is sent to the source base station. The method determines whether the UE delays uploading the measurement report by the value of the second variable to ensure that after the TAU process is completed, it switches from the source base station to the target base station, avoids the TAU process and the base station switching process from being performed simultaneously, and improves the tracking area update efficiency.

S1102, receiving tracking area information of a target cell sent by a target base station.

In this embodiment, the tracking area is a cell-level configuration, different cells can be configured with the same tracking area information, and one cell belongs to one tracking area. The base station corresponding to the target cell is the target base station, and the UE can receive the tracking area information of the target cell sent by the target base station.

S1103: Determine whether the tracking area of the target cell is consistent with the tracking area of the source cell based on the tracking area information of the source cell and the tracking area information of the target cell.

In this embodiment, the UE may match the tracking area information of the source cell with the tracking area information of the target cell. If the tracking area information of the source cell matches the tracking area information of the target cell successfully, it is determined that the tracking area of the target cell is consistent with the tracking area of the source cell; if the tracking area information of the source cell does not match the tracking area information of the target cell successfully, it is determined that the tracking area of the target cell is inconsistent with the tracking area of the source cell.

In the above tracking area update method, the UE sends a measurement report to the source base station corresponding to the source cell to indicate that the source base station is switching with the target base station corresponding to the target cell, receives the tracking area information of the target cell sent by the target base station, and determines whether the tracking area of the target cell is consistent with the tracking area of the source cell based on the tracking area information of the source cell and the tracking area information of the target cell. In this method, the UE can quickly obtain the tracking area information of the target cell sent by the target base station by sending a measurement report to the source base station; at the same time, the UE compares the tracking area information of the source cell with the tracking area information of the target cell, and can accurately determine whether the tracking area of the target cell is consistent with that of the source cell, thereby improving the tracking area update efficiency.

In one embodiment, as shown in FIG. 13 , a tracking area update method is provided, which is described by taking the method applied to the MME in FIG. 1 as an example, including the following steps:

S1301, receiving a first tracking area update request and a second tracking area update request sent by a UE; the first tracking area update request is sent by the UE after a cell handover occurs during a TAU process, and the second tracking area update request is sent by the UE when a TAU is triggered;

In this embodiment, the UE may send a second tracking area update request to the source base station, and the source base station may send the second tracking area update message to the MME, that is, the MME receives the second tracking area update request forwarded by the source base station. Also, the UE may send a first tracking area update request to the target base station, and the target base station may send the first tracking area update message to the MME, that is, the MME receives the first tracking area update request forwarded by the target base station.

S1302: If the content of the first tracking area update request is the same as the content of the second tracking area update request, a tracking area update message is sent.

In this embodiment, the first tracking area update request and the second tracking area update request both include the identifier of the source cell. The MME can match the identifier information carried by the first tracking area update request and the second tracking area update request. If the two identifier information are the same, it is determined that the content of the first tracking area update request is the same as the content of the second tracking area update request.

In the above tracking area update method, the MME receives the first tracking area update request and the second tracking area update request sent by the UE. If the content of the first tracking area update request and the content of the second tracking area update request are the same, a tracking area update message is sent. The first tracking area update request in the method is sent by the UE after a cell switch occurs during the TAU process, and the second tracking area update request is sent when the UE triggers the TAU. After the MME determines that the contents of the two tracking area update requests are consistent, the tracking area update message can be sent to the target base station. The MME does not need to wait for 6 seconds and can immediately send the tracking area update message to the target base station, thereby improving the working efficiency of the MME.

In one embodiment, this embodiment relates to an optional implementation method of sending a tracking area update message if the content of the first tracking area update request is the same as the content of the second tracking area update request. Based on the embodiment of Figure 13 above, the above S1302 may also include the following steps: if the MME does not send a tracking area update message according to the second tracking area update request before receiving the first tracking area update request and the second tracking area update request, then send a tracking area update message to the target base station corresponding to the cell handover.

In this embodiment, after the MME receives the second tracking area update request and the first tracking area update request, the MME does not send a tracking area update message corresponding to the second tracking area update request to the source base station. In this case, the content of the first tracking area update request is the same as the content of the second tracking area update request, and the MME only needs to process the second tracking area update request message and send a tracking area update message corresponding to the second tracking area update request message to the target base station.

In the above tracking area update method, if the MME does not send a tracking area update message according to the second tracking area update request before receiving the first tracking area update request and the second tracking area update request, the tracking area update message is sent to the target base station corresponding to the cell handover. When the two tracking area update requests received by the MME have the same content, only the previous tracking area update request needs to be processed, and the MME only needs to send a tracking area update request to the target base station, thereby improving the working efficiency of the MME.

In one embodiment, this embodiment relates to an optional implementation method of sending a tracking area update message if the content of the first tracking area update request is the same as the content of the second tracking area update request. Based on the embodiment of Figure 13 above, the above S1302 may also include the following steps: if a tracking area update message has been sent to a target base station corresponding to a cell handover according to the second tracking area update request before receiving the first tracking area update request, then after receiving the first tracking area update request, the tracking area update message is resent to the target base station.

In this embodiment, after the MME receives the second tracking area update request and before receiving the first tracking area update request, the MME has sent a tracking area update message corresponding to the second tracking area update request to the source base station, but has not received a tracking area update completion message sent by the UE. In this case, the content of the first tracking area update request is the same as the content of the second tracking area update request, and the MME does not need to process the first tracking area update request message, and sends a tracking area update message corresponding to the second tracking area update request to the target base station again.

In the above tracking area update method, if a tracking area update message has been sent to the target base station corresponding to the cell handover according to the second tracking area update request before receiving the first tracking area update request, the tracking area update message is resent to the target base station after receiving the first tracking area update request. If the MME has sent a tracking area update message to the source base station, and the two tracking area update requests received by the MME have the same content, the MME repeatedly sends the tracking area update message to the target base station. This process does not need to process the first tracking area update request, but only needs to resend the tracking area update message to the target base station. Compared with the prior art, there is no need to wait for 6 seconds before resending the tracking area update message to the target base station, thereby improving the working efficiency of the MME.

Furthermore, it can be understood that the above-mentioned tracking area update method is not only applicable to the LTE system. In the global 5G standard (5G New Radio, NR) system, when the tracking area of the user equipment changes and triggers the mobility registration process, if switching occurs between base stations, the problem can also be solved by the technical solution provided in this application, which can avoid the problem that the UE cannot be paged for a period of time.

In one embodiment, based on the above embodiment, a tracking area update method is provided, as shown in FIG14 , the method includes:

S1401, when the UE performs TAU, if a cell handover occurs, obtain a value of a preset first variable;

S1402, if the value of the first variable is the first value, determining that a cell handover occurs during the TAU process of the UE;

S1403: If the tracking area of the target cell is consistent with the tracking area of the source cell, send a first tracking area update request to the MME;

S1404: Receive a tracking area update message sent by the MME.

It should be noted that for the description in the above S1401-S1404, reference may be made to the relevant description in the above embodiment, and the effects are similar, which will not be repeated in this embodiment.

Furthermore, the tracking area update method provided in the present application is described in detail in conjunction with the flowcharts shown in Figures 15, 16 and 17.

In Figure 15, the UE enters a cell A in the idle state, and the TA of the cell A is not in the tracking area list of the previous cell. The UE sends a tracking area update request to the MME. When the UE confirms receipt of the tracking area update message, the UE has not sent a tracking area update completion message to the MME, and the base station initiates a handover. After the user equipment switches to the B cell, the UE sends a tracking area update completion message to the MME, and the tracking area update process is completed. When the UE does not receive the tracking area update message, the base station initiates a handover, and the UE determines whether the tracking areas of the A cell and the B cell are consistent. When the tracking areas of the A cell and the B cell are inconsistent, the UE re-initiates the TAU process; when the tracking areas of the A cell and the B cell are consistent, the UE immediately resends the tracking area update request. After receiving the tracking area update message sent by the MME, the UE sends a tracking area update completion message to the MME, and the tracking area update process is completed.

Figure 16 is a flow chart of the tracking area update method. Figure 16 is for determining the position of the TAUOngoing value. When the UE is in the TAU process and the base station initiates a handover, the UE determines whether the TA of cell A and cell B are consistent based on the system messages returned by different base stations. If the TA of cell A and cell B are consistent, the value of TAUOngoing is 1, and the UE resends a tracking area update request to the MME; if the TA of cell A and cell B are inconsistent, the UE initiates a new TAU process.

Figure 17 is a flow chart of the tracking area update method. Figure 17 is another implementation method of the tracking area update method. When the UE enters a new cell in an idle state, and the TA of the new cell is not in the tracking area list of the previous cell, the UE sends a tracking area update request to the MME, and the tracking area update process begins. At this time, the value of TAUOngoing is set to 1; when the tracking area update is completed or fails, the value of TAUOngoing is set to 0. When the UE is in a medium-speed or low-speed state and is in the TAU process, the value of TAUOngoing is 1, and the UE does not upload the measurement report to the base station temporarily. It is necessary to wait until the TAU process is completed, and the value of TAUOngoing is 0, and then the measurement report is uploaded to the source base station to complete the switching of the source base station to the target base station. It can be understood that in this process, the TAU process and the base station switching process are completed independently, and only the TAU process or the base station switching process can be completed in the same time period.

In the above tracking area update method, during the process of UE performing TAU, if a cell handover occurs, the value of the preset first variable is obtained, and if the value of the first variable is the first value, it is determined that the UE has a cell handover during the TAU process, and if the tracking area of the target cell is consistent with the tracking area of the source cell, a first tracking area update request is sent to the MME, and a tracking area update message sent by the MME is received. In this process, the UE does not need to wait for the tracking area update message sent by the MME. When the tracking areas of the source cell and the target cell are consistent, the UE can immediately resend the tracking area update request to the MME. Compared with the prior art, the UE does not need to wait for 25 seconds to resend the tracking area update request to the MME, which shortens the time of sending the tracking area update request twice, improves the tracking area update efficiency, and can greatly shorten the time of message loss.

It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the present application also provides a tracking area update device for implementing the tracking area update method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more tracking area update device embodiments provided below can refer to the limitations on the tracking area update method above, and will not be repeated here.

In one embodiment, as shown in FIG. 18 , a tracking area update device is provided, comprising: a first determination module 11 and a first sending module 12, wherein:

The first judgment module 11 is used to judge whether the tracking area of the target cell is consistent with the tracking area of the source cell if a cell handover occurs during the UE performing TAU;

The first sending module 12 is used to send a first tracking area update request to the MME when the tracking area of the target cell is consistent with the tracking area of the source cell; the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the above device further includes: a first receiving module, wherein:

The first receiving module is used to receive a tracking area update message sent by the MME; the tracking area update message is sent after the MME determines that the content of the first tracking area update message is the same as the content of the second tracking area update message.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the above device further includes: an acquisition module and a determination module, wherein:

An acquisition module, used for acquiring a value of a preset first variable;

The determination module is used to determine that a cell switching occurs during the TAU process of the UE when the value of the first variable is a first value.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the above device further includes: a second sending module, a second receiving module and a second judging module, wherein:

A second sending module is used to send a measurement report to a source base station corresponding to a source cell; the measurement report is used to instruct the source base station to switch with a target base station corresponding to a target cell;

A second receiving module is used to receive the tracking area information of the target cell sent by the target base station;

The second judgment module is used to judge whether the tracking area of the target cell is consistent with the tracking area of the source cell according to the tracking area information of the source cell and the tracking area information of the target cell.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the second sending module 16 includes: an acquisition unit and a first sending unit, wherein:

An acquisition unit is used to receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell handover occurs during a TAU, and the second tracking area update request is sent when the UE triggers a TAU;

The first sending unit is configured to send a tracking area update message when the content of the first tracking area update request is the same as the content of the second tracking area update request.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, as shown in FIG. 19 , a tracking area update device is provided, including: a third receiving module 21 and a third sending module 22, wherein:

The third receiving module 21 is used to receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell switch occurs during a TAU process, and the second tracking area update request is sent when the UE triggers a TAU;

The third sending module 22 is configured to send a tracking area update message if the content of the first tracking area update request is the same as the content of the second tracking area update request.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the third sending module 22 includes: a second sending unit, wherein:

The second sending unit is used to send a tracking area update message to a target base station corresponding to the cell switching if no tracking area update message is sent according to the second tracking area update request before receiving the first tracking area update request and the second tracking area update request.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

In one embodiment, based on the above embodiment, the third sending module 22 further includes: a third sending unit, wherein:

The third sending unit is used to send a tracking area update message to the target base station corresponding to the cell switching according to the second tracking area update request before receiving the first tracking area update request, and then resend the tracking area update message to the target base station after receiving the first tracking area update request.

The tracking area update device provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

Each module in the above tracking area update device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in an electronic device in the form of software, so that the processor can call and execute operations corresponding to each module.

In one embodiment, an electronic device is provided, which may be a server, and its internal structure diagram may be shown in FIG20. The electronic device includes a processor, a memory, an input/output interface (Input/Output, referred to as I/O) and a communication interface. The processor, the memory and the input/output interface are connected via a system bus, and the communication interface is connected to the system bus via the input/output interface. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store tracking area update data. The input/output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a tracking area update method is implemented.

In one embodiment, an electronic device is provided, which may be a terminal, and its internal structure diagram may be shown in FIG21. The electronic device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input/output interface are connected via a system bus, and the communication interface, the display unit, and the input device are connected to the system bus via the input/output interface. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input/output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner may be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a tracking area update method is implemented. The display unit of the electronic device is used to form a visually visible picture, which may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the electronic device housing, or an external keyboard, touchpad or mouse.

Those skilled in the art will understand that the structures shown in Figures 20 and 21 are merely block diagrams of partial structures related to the scheme of the present application, and do not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figures, or combine certain components, or have a different arrangement of components.

The embodiment of the present application also provides a computer-readable storage medium. One or more non-volatile computer-readable storage media containing computer-executable instructions, when the computer-executable instructions are executed by one or more processors, the processors execute the steps of the tracking area update method.

The embodiment of the present application also provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute a tracking area update method.

Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims (12)

1. A tracking area update method, characterized in that the method comprises: During the process of tracking area update TAU of the user equipment UE, if a cell handover occurs, it is determined whether the tracking area of the target cell is consistent with the tracking area of the source cell; If the tracking area of the target cell is consistent with the tracking area of the source cell, sending a first tracking area update request to a mobility management entity MME; Receive a tracking area update message sent by the MME; the tracking area update message is sent after the MME determines that the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU. 2. The method according to claim 1, characterized in that the method further comprises: Get the value of the preset first variable; If the value of the first variable is the first value, it is determined that a cell switch occurs to the UE during the TAU process. 3. The method according to claim 1, characterized in that the method further comprises: Sending a measurement report to a source base station corresponding to the source cell; the measurement report is used to instruct the source base station to switch with a target base station corresponding to the target cell; Receiving tracking area information of the target cell sent by the target base station; According to the tracking area information of the source cell and the tracking area information of the target cell, it is determined whether the tracking area of the target cell is consistent with the tracking area of the source cell. 4. The method according to claim 3, characterized in that the sending of the measurement report to the source base station corresponding to the source cell comprises: Obtaining a value of a preset second variable and a current rate of the UE; If the value of the second variable is the second value and the current rate is less than the preset rate threshold, after the TAU is completed, the value of the second variable is modified to a third value, and the measurement report is sent to the source base station. 5. A tracking area update method, characterized in that the method comprises: Receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell switch occurs during a TAU, and the second tracking area update request is sent when the UE triggers a TAU; If the content of the first tracking area update request is the same as the content of the second tracking area update request, a tracking area update message is sent. 6. The method according to claim 5, wherein the first tracking area update request and the second tracking area update request both include an identifier of a source cell, and if the content of the first tracking area update request is the same as the content of the second tracking area update request, sending the tracking area update message comprises: If the tracking area update message is not sent according to the second tracking area update request before receiving the first tracking area update request and the second tracking area update request, the tracking area update message is sent to the target base station corresponding to the cell switching. 7. The method according to claim 6, wherein the first tracking area update request and the second tracking area update request both include an identifier of a source cell, and if the content of the first tracking area update request is the same as the content of the second tracking area update request, sending the tracking area update message comprises: If the tracking area update message has been sent to the target base station corresponding to the cell switching according to the second tracking area update request before receiving the first tracking area update request, then after receiving the first tracking area update request, the tracking area update message is resent to the target base station. 8. A tracking area updating device, comprising: A first judgment module is used to judge whether the tracking area of the target cell is consistent with the tracking area of the source cell if a cell handover occurs during the process of the user equipment UE performing the tracking area update TAU; A first sending module, configured to send a first tracking area update request to a mobility management entity MME when the tracking area of the target cell is consistent with the tracking area of the source cell; The first receiving module is used to receive a tracking area update message sent by the MME; the tracking area update message is sent after the MME determines that the content of the first tracking area update request is the same as the content of the second tracking area update request, and the second tracking area update request is sent when the UE triggers TAU. 9. A tracking area update device, comprising: The third receiving module is used to receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area update request is sent by the UE after a cell switch occurs during a TAU, and the second tracking area update request is sent when the UE triggers a TAU; The third sending module is used to send a tracking area update message if the content of the first tracking area update request is the same as the content of the second tracking area update request. 10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, the processor executes the steps of the tracking area update method as described in any one of claims 1 to 7. 11. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented. 12. A computer program product, comprising a computer program, characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.