CN115103347A

CN115103347A - Tracking area updating method and device, electronic equipment and computer readable storage medium

Info

Publication number: CN115103347A
Application number: CN202210640117.0A
Authority: CN
Inventors: 罗强
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-09-23
Anticipated expiration: 2042-06-08
Also published as: CN115103347B

Abstract

The application relates to a tracking area updating method, a tracking area updating device, an electronic device and a computer readable storage medium. The method comprises the following steps: in the process of TAU of UE, if cell switching occurs, judging whether a tracking area of a target cell is consistent with a tracking area of a 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 the TAU. By adopting the method, the updating efficiency of the tracking area can be improved, and the success rate of the called party is improved.

Description

Tracking area updating method and device, electronic equipment 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 and apparatus, an electronic device, and a computer-readable storage medium.

Background

When the location of a User Equipment (UE) is switched from an old cell to a new cell and Tracking Area information of the new cell is inconsistent with information in a Tracking Area list of the old cell, the UE sends a Tracking Area Update Request (Tracking Area Update Request) to a Mobility Management Entity (MME), and the Tracking Area Update process is completed through the MME. In the Tracking Area Update (TAU) process, if handover occurs between base stations, the TAU may fail, and the UE may not receive the paging message or the Cs Service Notification message sent by the core network.

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

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

Disclosure of Invention

The embodiment of the application provides a tracking area updating method and device, electronic equipment and a computer readable storage medium, and the tracking area updating efficiency can be improved.

A tracking area update method, the method comprising:

in the process of TAU of UE, if cell switching occurs, judging whether the tracking area of a target cell is consistent with the tracking area of a 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 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 the TAU.

A tracking area update method, the method comprising:

receiving a first tracking area updating request and a second tracking area updating request sent by UE; the first tracking area updating request is sent after the UE is subjected to cell switching in the TAU process, and the second tracking area updating request is sent when the UE triggers the TAU;

and if the content of the first tracking area updating request is the same as that of the second tracking area updating request, transmitting a tracking area updating message.

A tracking area update apparatus, the apparatus comprising:

a first judging module, configured to, in a process of a TAU performed by a UE, judge whether a tracking area of a target cell is consistent with a tracking area of a source cell if cell switching occurs;

a first sending module, configured to send a first tracking area update request to an MME if 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 a second tracking area update request, and the second tracking area update request is sent when the UE triggers the TAU.

A tracking area update apparatus, the apparatus comprising:

a third receiving module, configured to receive a first tracking area update request and a second tracking area update request sent by the UE; the first tracking area updating request is sent after the UE is subjected to cell switching in the process of TAU, and the second tracking area updating request is sent when the UE triggers TAU;

a third sending module, 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.

An electronic device comprising a memory and a processor, the memory having a computer program stored thereon, wherein the computer program, when executed by the processor, causes the processor to perform the steps of the tracking area update method according to any of the above method embodiments.

A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method steps of any one of the above-mentioned method embodiments.

A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, is adapted to carry out the steps of the method of any of the above-mentioned method embodiments.

According to the tracking area updating method, the tracking area updating device, the electronic equipment and the computer readable storage medium, in the process of TAU of the UE, if cell switching occurs, whether the tracking area of a target cell is consistent with the tracking area of a source cell is judged; 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 the TAU. In the process, the UE does not need to wait for the tracking area update message sent by the MME, and can immediately send the tracking area update request to the MME again under the condition that the tracking areas of the source cell and the target cell are consistent.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram of an application environment of a tracking area update method in one embodiment;

FIG. 2 is a flow diagram of a tracking area update method in one embodiment;

FIG. 3 is a flow diagram of a tracking area update method in one embodiment;

FIG. 4 is a flow diagram of an X2 handover process in one embodiment;

FIG. 5 is a flow diagram of an S2 handover procedure in one embodiment;

FIG. 6 is a flow diagram of an MME sending a paging message to a UE in one embodiment;

fig. 7 is a called flow diagram of an MME initiating CSFB to a UE in an embodiment;

FIG. 8 is a flow diagram of a TAU failure resulting in a paging miss in one embodiment;

FIG. 9 is a flow diagram of a tracking area update method in one embodiment;

FIG. 10 is a flow diagram of a tracking area update method in one embodiment;

FIG. 11 is a flow diagram of a tracking area update method in one embodiment;

FIG. 12 is a flow diagram of a tracking area update method in one embodiment;

FIG. 13 is a flow diagram of a tracking area update method in one embodiment;

FIG. 14 is a flow diagram of a tracking area update method in one embodiment;

FIG. 15 is a flow diagram of a tracking area update method in one embodiment;

FIG. 16 is a flow diagram of a tracking area update method in one embodiment;

FIG. 17 is a flow diagram of a tracking area update method in one embodiment;

FIG. 18 is a block diagram showing the structure of a tracking area updating apparatus according to an embodiment;

FIG. 19 is a block diagram showing the structure of a tracking area update apparatus according to an embodiment;

FIG. 20 is a block diagram showing the structure of an electronic apparatus according to an embodiment;

FIG. 21 is a block diagram showing the structure of an electronic apparatus according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

The tracking area updating method provided by the embodiment of the application can be applied to the application environment shown in fig. 1. The application environment comprises a user equipment 100, a source base station 200, a target base station 300 and a mobility management entity 400, wherein 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, the target base station 300 communicates with the mobility management entity 400 through the network. The user equipment 100 may be a wireless terminal which may be a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. The wireless terminals may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, that exchange language and/or data with a radio access network. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The source bs 200 and the target bs 300 may be Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), evolved Node B (eNodeB) in LTE, relay Station or Access point, or Base Station in 5G network, and the like, and are not limited herein.

First, before specifically describing the technical solution of the embodiment of the present application, a technical background on which the embodiment of the present application is based is described.

Fig. 2 shows a schematic diagram of a tracking area update process, and in fig. 2, the process of tracking area update may be represented as: the UE sends a Tracking Area Update Request to the MME, the MME judges the Tracking Area Update Request after receiving the Tracking Area Update Request, and sends a Tracking Area Update message or a Tracking Area Update Reject message (Tracking Area Update Request) to the UE within a preset time. After receiving a Tracking Area Update message sent by the MME, the UE sends a Tracking Area Update completion message (Tracking Area Update Request Complete) to the MME, which indicates that the Tracking Area Update process is completed; after 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 fails, and the UE needs to send a tracking area update request to the MME again, and then initiates the TAU process again.

In the prior art, in the process of TAU, when a UE is switched from a source cell to a target cell, an MME sends a tracking area update message to a source base station corresponding to the source cell, and forwards the tracking area update message to the UE through the source base station, or forwards the tracking area update message to the target base station through the source base station, and forwards the tracking area update message to the UE through the target base station. Fig. 3 is a flowchart of a Tracking Area update method in the prior art, where in fig. 3, a UE enters an a cell in an idle state, and a Tracking Area (TA) of the a cell is not in a Tracking Area list of a previous cell, the UE sends a Tracking Area update request to an MME, when the UE confirms that a Tracking Area update message is received and the UE has not sent a Tracking Area update completion to the MME, the base station initiates handover, and after the UE is handed over to a B cell, the UE sends a Tracking Area update completion to the MME, and the Tracking Area update flow is completed. When the UE does not receive the tracking area updating message, the base station initiates switching, the UE judges whether the tracking areas of the cell A and the cell B are consistent, and when the tracking areas of the cell A and the cell B are inconsistent, the UE re-initiates a TAU flow; and when the tracking areas of the cell A and the cell B are consistent, the UE judges whether the cell B immediately receives the tracking area updating message, and when the cell B immediately receives the tracking area updating message, the UE sends the tracking area updating completion to the MME in the cell B. Branch a processing flow is entered next: and when the B cell does not immediately receive the tracking area updating message and receives the tracking area updating message retransmitted by the MME after 6 seconds, the UE sends the tracking area updating completion to the MME in the B cell. When the UE does not receive the tracking area update message within 6 seconds of the cell B, the UE needs to wait 25 seconds and then sends a tracking area update request to the MME. In 25 seconds of waiting for the UE, the UE needs to wait 15 seconds to determine whether to receive the tracking area update message sent by the MME, and if the UE does not receive the tracking area update message sent by the MME within 15 seconds, the UE needs to wait 10 seconds to send the tracking area update request to the MME. The waiting time of 25 seconds for the UE and the waiting time of 6 seconds for the MME can be timed by a timer, so that the accuracy of the waiting time is ensured. Branch B is followed by the process flow: and the MME confirms whether the tracking area updating request is received, if so, the MME sends a tracking area updating message to the UE, and the UE sends the tracking area updating completion to the MME in the cell B. Branch C is followed by the process flow: if the MME confirms that the tracking area updating request is not received, the MME sends a rejection tracking area updating to the UE, and the UE initiates a registration process with the rejection reason. For example, the MME replies to the Tracking area update reject carrying a reject reason on the Tracking area update reject, which may be #10 identity deleted, for example. At this time, the UE side may cause call drop and need to reinitiate attach.

When UE is switched from a source cell to a target cell, the UE sends a measurement report to the source base station, the source base station is switched to the target base station after receiving the measurement report sent by the UE, and switching inside a system in a Long Term Evolution (LTE) network comprises two switching modes, wherein the two switching modes are X2 switching and S1 switching respectively.

Fig. 4 is a flowchart of an X2 handover process, where an X2 handover refers to a handover of a UE from a cell of a certain base station to a cell of another base station when the UE is in a connected state, and an X2 interface exists between the two base stations and is configured. The basic idea of the switching of the X2 interface is as follows: 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 according to the self-switching algorithm, the source base station performs switching judgment, and after judging switching, the source base station sends a switching Request (Handover Request) to the target base station, and after receiving the Handover Request, the target base station starts to perform L1/L2 switching preparation, and simultaneously sends a switching confirmation (Handover Request Ack) message to the source base station. After receiving the Handover Request Ack, the source base station issues a Handover Command (Handover Command) to the UE through a signaling radio resource control Connection Reconfiguration (RRC Connection Reconfiguration) message, where the Handover Command carries an RRC Connection Reconfiguration message of the mobility control information. The source base station transmits 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 acknowledgement message (Path Switch Request Ack) to the target base station to inform the target base station that the Path Switch is completed.

In the process of performing the X2 handover, the MME does not know that the UE is being handed over, and the MME normally processes the TAU procedure initiated by the UE and sends a tracking area update message to the UE. When the UE initiates the TAU procedure 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 updating message to the source base station, the source base station forwards the tracking area updating message to the UE, the UE does not successfully receive the tracking area updating message, the MME does not retransmit the tracking area updating message in the target cell by HARQ and RLC ARQ, and the MME waits for 6 seconds and then retransmits the tracking area updating message in the target cell;

(2) after the source base station sends the switching command, the source base station receives the tracking area updating message, and if the source base station can forward the tracking area updating message to the target base station, the TAU process can be normally performed. 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 overtime to retransmit the tracking area update message in the target cell;

(3) MME sends the tracking area updating message in the switching process, and the tracking area updating message can not be retransmitted, UE can only restart the tracking area updating request after the timeout of 25 seconds;

(4) in another case, the MME may not be able to process the Tracking area update request sent by the UE after the T3411 expires, the MME considers that the TAU fails, and has released the context of the UE, the MME replies a Tracking area update request carrying a reason #10 identifier, and the UE needs to initiate an attach again according to the failure reason, resulting in a call drop during the call. The reason for the rejection may be #22, #28, #65, #67, or #90, #91, etc.

Fig. 5 is a flowchart of the S2 handover process, where the S2 handover refers to a handover of a UE from a cell of a certain base station to a cell of another base station when the UE is in a connected state, and no X2 interface is configured between the two base stations. The basic idea of switching the S2 interface is as follows: after the source base station receives a measurement report of the UE, the source base station receives a measurement result reported by the UE, and according to a self-switching algorithm, switching judgment is carried out, after switching judgment, a switching Request Handover Request is sent to the MME, the MME forwards the Handover Request to the target base station, after the target base station receives the Handover Request, switching preparation of L1/L2 is started, and meanwhile, a switching confirmation Handover notice message is sent to the MME. And after the MME receives the Handover Notify, the MME sends a Handover Command to the source base station. The source base station issues a Handover Command to the UE through an RRC Connection Reconfiguration message. The UE transmits a Handover Complete message to the target base station through an RRC Connection Reconfiguration Complete message.

In the process of performing S2 handover, the MME knows that the UE has cell handover during the TAU procedure, the MME needs to perform handover negotiation with the target base station, the TAU procedure initiated by the UE occurs in the NAS layer, and the S1 handover is an S1 interface, which has the following problems:

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

(2) the MME sends a tracking area update message to a source base station, and because an X2 interface does not exist between the source base station and a target base station, the source base station cannot forward the tracking area update message to the target base station, and the MME needs to wait for 6 seconds to retransmit the tracking area update message to the target base station;

(3) the method comprises the steps that an MME sends a tracking area updating message to a source base station, the source base station cannot forward the tracking area updating message to a target base station due to the fact that an X2 interface does not exist between the source base station and the target base station, meanwhile, the MME cannot retransmit the tracking area updating message on the target cell, and UE needs to wait for 25 seconds and then sends a tracking area updating request to the MME again;

(4) in another case, the MME may not be able to process the Tracking area update request sent by the UE after the T3411 expires, the MME considers that the TAU fails, and has released the context of the UE, the MME replies to reject Tracking area update request carrying reason #10 identifier, and the UE needs to initiate attach again according to the failure reason, resulting in call drop of the UE during the call.

In the prior art, the UE does not receive the tracking area update message sent by the MME, and the MME needs to wait 6 seconds to retransmit the tracking area update message to the target base station, or the UE needs to wait 25 seconds and then re-initiate the tracking area update request, which may result in that the UE cannot receive an idle paging or a calling/called signaling (CS service notification) sent by the network within a certain time.

Fig. 6 shows a flowchart of MME sending a paging message to UE, when UE is in idle state, MME sending paging to all base stations belonging to TA registered by UE, but UE losing the paging because TA registration of UE at target base station is not successful and target base station does not receive the paging.

Fig. 7 is a called flow chart showing that an MME initiates CSFB to a UE, when the UE is in a connected state, an external called request Initial Address Message is sent to a mobile services switching center (MSC) where a Location Area Code (LAC) registered by the UE is located, and then the MSC sends the Message to a corresponding MME. When the TAU procedure fails, it may cause a registration failure in a source cell corresponding to a Tracking area code of cell served by neighbor Enb (TAC), a called request may be sent to an MSC of a TA corresponding to the TAC, and the MSC may find a previous MME, resulting in that the UE may not receive CS service notification.

Fig. 8 is a flowchart of paging loss caused by TAU failure, when the UE enters branch a or branch B in fig. 3, it is determined whether the network releases the UE, and if the network releases the UE and the UE enters an idle state, the MME already sends a tracking area update message, but the UE does not receive the tracking area update message. In the above process, since the tracking area update of the UE is unsuccessful, any paging for the UE is sent to the previous TA, and after waiting for 25 seconds, the UE resends the tracking area update request to the MME, and the UE cannot receive the paging within 25 seconds. If the network does not release the UE and a new tracking area update has a new location area code, when the UE is in a connected state and when the MME initiates a CSFB call to the UE, because the MME does not register a new LAC in the MSC, the paging message is sent to the previous tracking area, and if the UE enters the branch a in fig. 3, the MME needs to wait for 6 seconds, and then the MME retransmits the tracking area update message in the target cell, and the UE cannot receive the call of 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 25 seconds later, and the UE cannot receive the call in the CS domain within 25 seconds.

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

s901, in the process of TAU of UE, if cell switching occurs, whether the tracking area of the target cell is consistent with the tracking area of the source cell is judged.

The tracking area comprises a position area and a routing area, the tracking area is an area used for determining the position of the UE by the network, and when the UE is in an idle state, the network can know the TA where the UE is located; when a UE in idle state is paged by the network, the network must page at all cells of the TA with which the UE is registered. The tracking area update refers to a process that when the UE enters a new cell, the TA of the cell is not in the registered TA, and the UE needs to initiate a TAU to the MME to register the TA of the new cell. The cell switching refers to that the UE needs to complete the UE context switching and updating process through some signaling processes due to the movement between different cells in the connected state.

In the process of TAU of UE, before the UE receives the tracking area update message sent by MME, cell switching occurs. For example, when the a cell is used as a source cell and the B cell is used as a target cell, and when the UE enters the a cell from an idle state, and performs TAU on the a cell, the UE switches from the a cell to the B cell without receiving a tracking area update message sent by the MME, and it needs to determine whether tracking areas of the a cell and the B cell are consistent.

In the tracking area updating process, the UE may send a tracking area updating request to the base station, and forward the tracking area updating request to the MME through the base station. The MME may determine a target cell for tracking area update through the base station.

In this embodiment, in the process of performing TAU by the UE, if cell handover occurs, the UE sends measurement reports to the source base station and the target base station, after receiving the measurement reports, the source base station and the target base station send system messages to the UE, respectively, the UE may obtain, from the system messages, a tracking area message of the source cell and tracking area information of the target cell, and match the obtained tracking area message of the source cell with the tracking area information of the target cell, and determine 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 greater than a preset threshold; and if the similarity between the tracking area message of the source cell and the tracking area message of the target cell is less than or equal to a preset threshold value, determining 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, sending a first tracking area updating request to the MME; the content of the first tracking area update request is the same as that of the second tracking area update request, and the second tracking area update request is sent when the UE triggers the TAU.

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

When triggering TAU, UE sends a tracking area update request to MME, and when UE does not receive a tracking area update message corresponding to the tracking area update request, UE switches from a source cell to a target cell, and when the tracking areas of the source cell and the target cell are consistent, UE sends the tracking area update request to MME again. For example, when the B cell is used as a source cell and the C cell is used as a target cell, and the UE enters the B cell from the a cell, the UE sends a tracking area update request to the MME in the B cell, and the UE does not receive a tracking area update message corresponding to the tracking area update request. And when the UE is switched from the cell B to the cell C and the tracking area information of the cell B is consistent with that of the cell C, the UE sends a tracking area updating request to the MME again. The UE does not need to wait for the MME to send the tracking area updating message, and immediately sends the tracking area updating request again, so that the waiting time of the UE side is reduced, and the updating efficiency of the tracking area is improved.

In the above tracking area updating method, in the process of TAU performed by UE, if cell switching occurs, it is determined 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. Because the tracking areas of the source cell and the target cell are consistent, the UE can immediately send the tracking area updating request to the MME again, compared with the prior art, the UE does not need to wait for the tracking area updating message retransmitted by the MME after 6S, or the UE does not need to wait for 25S to send the tracking area updating request to the MME again, the time for sending the tracking area updating request twice is shortened, the tracking area updating efficiency is improved, the time for losing the message can be greatly shortened, and the success rate of the called party of the UE is improved.

In another embodiment, after the UE sends the tracking area update request, the UE may receive a tracking area update message sent by the MME. Therefore, on the basis of the above embodiment, the method may further include: receiving a tracking area updating message sent by an 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.

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

Because the contents of the tracking area updating requests sent by the UE twice are consistent, after the MME receives the tracking area updating requests twice and determines that the contents of the tracking area updating requests twice are consistent, the MME sends a tracking area updating message to the UE. Optionally, the MME may send the tracking area update message to the target base station, and forward the tracking area update message to the UE through the target base station, that is, the UE may receive the tracking area update message sent by the target base station. Optionally, the MME may send the tracking area update message to the source base station, forward the tracking area update message to the target base station through the source base station, and forward the tracking area update message to the UE through the target base station, that is, the UE may receive the tracking area update message sent by the target base station. In this embodiment, a manner of receiving the tracking area update message sent by the MME is not limited.

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

Fig. 10 is a flowchart illustrating a tracking area updating method according to an embodiment of the present application. The present embodiment relates to an alternative implementation of how to determine that a cell handover occurs during a TAU procedure of a UE. On the basis of the embodiment of fig. 9, as shown in fig. 10, the method may further include the following steps:

and S1001, acquiring a preset value of a first variable.

In this embodiment, since the states of a Non Access Stratum (NAS) and a Radio Resource Control (RRC) layer in the UE are not synchronized, a preset first variable (tauingogging) needs to be set, and the UE determines whether cell handover occurs during the process of TAU through the value of tauingogging. The preset value of the first variable may be a first value, and if the preset value of the first variable is the first value, the UE performs cell handover during the TAU. For example, the value of tauinggoing may be set to 1 or 0, and if the value of the first variable is 1, it indicates that the UE performs cell handover during the TAU procedure; if the value of the first variable is 0, it indicates that the UE has not performed cell handover during the TAU procedure. Or, the value of the first variable may also be True or False, where True indicates that the UE performs cell handover during the process of performing TAU, and False indicates that the UE does not perform cell handover during the process of performing TAU, which is not limited in the embodiment of the present application.

S1002, if the value of the first variable is the first value, determining that the UE performs cell handover during the TAU procedure.

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 procedure. And when the value of the first variable is the first value and the UE is determined not to receive the tracking area updating message, switching the source cell to the target cell.

In the tracking area updating method, the UE obtains a preset value of a first variable, and if the value of the first variable is the first value, it is determined that the UE performs cell switching during the TAU procedure. In the method, the UE can quickly determine whether the cell switching occurs in the process of TAU by the first variable value, the judgment time of the UE is shortened, so that the judgment speed of the UE side is faster, and the tracking efficiency of the tracking area is improved.

Fig. 11 is a flowchart illustrating a tracking area updating method according to an embodiment of the present application. The present embodiment relates to an alternative implementation of how to determine whether the tracking area of the target cell is consistent with the tracking area of the source cell. On the basis of the embodiment of fig. 9, as shown in fig. 11, 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 for indicating the source base station to switch with the target base station corresponding to the target cell.

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

The method comprises the steps that a source base station sends a measurement control message to UE, the UE generates a measurement report from the measurement control message after receiving 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 a target base station, the target base station returns a Handover confirmation message (Handover Request Ack) to the source base station, and the Handover process of the source base station and the target base station is completed.

Fig. 12 is a flowchart illustrating a tracking area updating method according to an embodiment of the present application. This embodiment relates to an alternative implementation manner of sending a measurement report to a source base station corresponding to a source cell. On the basis of the embodiment of fig. 11, as shown in fig. 12, the step S1101 may include the following steps:

s1201, acquiring a preset value of a second variable and the current rate of the UE.

In this embodiment, a preset second variable (TAUOngoing) needs to be set to determine a time when the UE sends the measurement report to the base station, and the UE determines whether the UE sends the measurement report to the base station according to a value of TAUOngoing. The preset value of the second variable may include a second value, and if the preset value of the second variable is the second value, the UE sends a measurement report to the base station. For example, the value of tauinggoing may be set to 1 or 0, and if the second value of the second variable is 1, it indicates that the UE temporarily does not send a measurement report to the base station; if the second value of the second variable is 0, the UE may send a measurement report to the base station. Alternatively, the value of the second variable may also be True or False, where True indicates that the UE temporarily does not send the measurement report to the base station, and False indicates that the UE may send the measurement report to the base station, which is not limited in this embodiment of the present invention.

Optionally, the UE may obtain the current speed of the UE through a speed measurement sensor provided in the UE. Optionally, the UE may also obtain a moving distance and a moving time of the UE, and obtain the current rate of the UE according to a rate calculation formula. The present embodiment does not limit the manner of obtaining the current rate of the UE.

And S1202, if the value of the second variable is the second value and the current rate is smaller than the preset rate threshold, modifying the value of the second variable to a third value after the TAU is finished, and sending a measurement report to the source base station.

In this embodiment, the UE compares the current rate with a preset rate threshold, and if the current rate is greater than the preset rate threshold, the UE is in a high-speed state; and if the current speed is less than or equal to the preset speed threshold, the UE is in a medium-speed or low-speed state. When the UE is in the high-speed state, the UE may cause deterioration of the radio environment by delaying reporting of the measurement report in the high-speed state.

And when the UE is in a medium-speed or low-speed state, if the TAUOngying value is 1, determining that the UE does not send a measurement report to the base station temporarily. And the UE receives the tracking area updating message sent by the MME, and then completes the TAU process after the tracking area updating completion message sent by the MME is sent to the UE, when the UE modifies the value of the TAUOnggoing to 0, the UE sends the measurement report to the source base station, and the source base station switches to the target base station after receiving the measurement report, and completes the switching from the source base station to the target base station.

In the above method for updating a tracking area, the UE modifies the value of the second variable into a third value and sends a measurement report to the source base station, by acquiring the value of a 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 smaller than a preset rate threshold value after the TAU is completed. The method determines whether the UE delays uploading of the measurement report through the value of the second variable so as to ensure that the UE is switched from the source base station to the target base station after the TAU process is finished, thereby avoiding the TAU process and the base station switching process from being carried out simultaneously and improving the updating efficiency of the tracking area.

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

In this embodiment, the tracking areas are configured at a cell level, different cells may 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 may receive tracking area information of the target cell sent by the target base station.

And S1103, judging 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.

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

In the tracking area updating method, the UE sends a measurement report for indicating the switching between the source base station and the target base station corresponding to the target cell to the source base station corresponding to the source cell, receives the tracking area information of the target cell sent by the target base station, and judges 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. In the 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; meanwhile, the UE compares the tracking area information of the source cell and the tracking area information of the target cell, whether the tracking areas of the target cell and the source cell are consistent or not can be accurately determined, and the updating efficiency of the tracking areas is improved.

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

s1301, receiving a first tracking area updating request and a second tracking area updating request sent by UE; the first tracking area updating request is sent after the UE is subjected to cell switching in the TAU process, and the second tracking area updating request is sent when the UE triggers the TAU;

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

In this embodiment, the first tracking area update request and the second tracking area update request both include an identifier of the source cell, and the MME may match identifier information carried by the first tracking area update request and the second tracking area update request, and if the two identifier information are the same, determine 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 tracking area updating method, the MME receives the first tracking area updating request and the second tracking area updating request sent by the UE, and sends a tracking area updating message if the content of the first tracking area updating request is the same as the content of the second tracking area updating request. In the method, a first tracking area updating request is sent after the UE is subjected to cell switching in the process of TAU, a second tracking area updating request is sent when the UE triggers the TAU, after the MME determines that the contents of the two tracking area updating requests are consistent, the MME can send a tracking area updating message to a target base station, the MME does not need to wait for 6s, the tracking area updating message can be sent to the target base station immediately, and the working efficiency of the MME is improved.

In an embodiment, this embodiment relates to an alternative implementation manner of sending the 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. On the basis of the embodiment of fig. 13, the step S1302 may further include the following steps: and if the MME does not send the tracking area updating message according to the second tracking area updating request before receiving the first tracking area updating request and the second tracking area updating request, the MME sends the tracking area updating message to a target base station corresponding to cell switching.

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 the tracking area update message corresponding to the second tracking area update request message to the target base station.

In the above tracking area updating 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 MME sends a tracking area update message to a target base station corresponding to cell switching. Under the condition that the contents of the two tracking area updating requests received by the MME are the same, only the previous tracking area updating request needs to be processed, the MME only needs to send the tracking area updating request to the target base station and process one tracking area updating request, and the tracking area updating message sent to one base station improves the working efficiency of the MME.

In an embodiment, this embodiment relates to an alternative implementation manner of sending the 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. On the basis of the embodiment of fig. 13, the step S1302 may further include the following steps: and if the tracking area updating message is sent to the target base station corresponding to the cell switching according to the second tracking area updating request before the first tracking area updating request is received, the tracking area updating message is sent to the target base station again after the first tracking area updating request is received.

In this embodiment, after the MME receives the second tracking area update request and before the MME does not receive the first tracking area update request, the MME already sends a tracking area update message corresponding to the second tracking area update request to the source base station, but does not receive 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 sends the tracking area update message corresponding to the second tracking area update request to the target base station again without processing the first tracking area update request message.

In the tracking area updating method, if the tracking area updating message is sent to the target base station corresponding to the cell handover according to the second tracking area updating request before the first tracking area updating request is received, the tracking area updating message is sent to the target base station again after the first tracking area updating request is received. If the MME has sent the tracking area update message to the source base station, and the contents of the two tracking area update requests received by the MME are the same, the MME repeatedly sends the tracking area update message to the target base station, and in the process, the first dirty update request does not need to be processed, and only the tracking area update message needs to be sent again to the target base station.

Further, it can be understood that the tracking area updating method is not only applicable to an LTE system, but also can solve the problem that the UE cannot be paged within a period of time by using the technical solution provided by the present application in triggering a mobility registration (registration) process when the tracking area where the UE is located changes in a global 5G standard (5G New Radio, NR) system.

In an embodiment, on the basis of the above embodiments, there is provided a tracking area updating method, as shown in fig. 14, the method includes:

s1401, in the process of TAU of UE, if take place the district to switch over, obtain the value of the first variable preserved;

s1402, if the value of the first variable is the first value, determining that the UE is subjected to cell switching in the TAU process;

s1403, if the tracking area of the target cell is consistent with the tracking area of the source cell, a first tracking area updating request is sent to the MME;

s1404, receiving a tracking area update message sent by the MME.

It should be noted that, for the descriptions in the above S1401-S1404, reference may be made to the descriptions related to the above embodiments, and the effects are similar, and the description of this embodiment is not repeated herein.

Further, the tracking area updating method provided for the present application is described in detail with reference to the flowcharts shown in fig. 15, fig. 16 and fig. 17.

In fig. 15, the UE enters an a cell in an idle state, and the TA of the a cell 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 that the tracking area update message is received and the UE does not send a tracking area update completion to the MME, the base station initiates handover, after the UE is handed over to the B cell, the UE sends a tracking area update completion to the MME, and the tracking area update flow is completed. When the UE does not receive the tracking area updating message, the base station initiates switching, the UE judges whether the tracking areas of the cell A and the cell B are consistent, and when the tracking areas of the cell A and the cell B are inconsistent, the UE re-initiates a TAU flow; and when the tracking areas of the cell A and the cell B are consistent, the UE immediately resends a tracking area updating request, and after receiving a tracking area updating message sent by the MME, the UE sends the tracking area updating completion to the MME, so that the tracking area updating process is completed.

Fig. 16 is a schematic flowchart of a tracking area update method, where fig. 16 is a flowchart of a method for determining a location of a TAU on going value, where, when a base station initiates handover when a UE is in a TAU process, the UE determines whether TAs of a cell a and a cell B are consistent according to system messages returned by different base stations, and if the TAs of the cell a and the cell B are consistent and the value of the TAU on going is 1, the UE sends a tracking area update request to an MME again; and if the TA of the cell A is inconsistent with the TA of the cell B, the UE initiates a new TAU flow.

Fig. 17 is a schematic flowchart of a tracking area updating method, and fig. 17 is another embodiment of the tracking area updating method, in which a UE enters a new cell in an idle state, and a TA of the new cell is not in a tracking area list of a previous cell, the UE sends a tracking area updating request to an MME, a tracking area updating process starts, and at this time, a value of tauingogogogogong 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 in a TAU process, the value of the TAUOnggoing is 1, the UE does not upload a measurement report to the base station temporarily, after waiting for the completion of the TAU process, the value of the TAUOnggoing is 0, and the measurement report is uploaded to the source base station to complete the switching from the source base station to the target base station. It can be understood that, in this process, the TAU procedure and the base station handover procedure are independently completed, and only the TAU procedure or the base station handover procedure can be completed within the same time period.

In the tracking area updating method, in the process of TAU of the UE, if cell switching occurs, a preset value of a first variable is obtained, if the value of the first variable is the first value, the cell switching of the UE in the process of TAU is determined, if the tracking area of a target cell is consistent with the tracking area of a source cell, a first tracking area updating request is sent to an MME, and a tracking area updating message sent by the MME is received. In the process, the UE does not need to wait for the tracking area update message sent by the MME, and can immediately send the tracking area update request to the MME again under the condition that the tracking areas of the source cell and the target cell are consistent.

It should be understood that, although the steps in the flowcharts related to the embodiments are shown in sequence as indicated by the arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order unless explicitly stated herein, and may be performed in other orders. Moreover, at least a part of the steps in the flowcharts related to the above embodiments may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately 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 further provides a tracking area updating apparatus for implementing the above-mentioned tracking area updating method. The implementation scheme for solving the problem provided by the apparatus is similar to the implementation scheme described in the above method, so the specific limitations in one or more embodiments of the tracking area updating apparatus provided below may refer to the limitations on the tracking area updating method in the foregoing, and are not described herein again.

In one embodiment, as shown in fig. 18, there is provided a tracking area updating apparatus including: a first judging module 11 and a first sending module 12, wherein:

a first determining module 11, configured to determine, in a process of a TAU performed by a UE, whether a tracking area of a target cell is consistent with a tracking area of a source cell if cell switching occurs;

a first sending module 12, configured to send a first tracking area update request to the MME under a condition that a tracking area of the target cell is consistent with a 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 the TAU.

The tracking area updating apparatus provided in this embodiment may implement the method embodiments described above, and the implementation principle and technical effect are similar, which are not described herein again.

In one embodiment, on the basis of the above embodiment, the above apparatus further includes: a first receiving module, wherein:

a first receiving module, configured to receive a tracking area update message sent by an 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.

In one embodiment, on the basis of the above embodiment, the above apparatus further includes: an acquisition module and a determination module, wherein:

the acquisition module is used for acquiring the value of a preset first variable;

and a determining module, configured to determine that cell handover occurs in a process of performing TAU by the UE when the value of the first variable is the first value.

In one embodiment, on the basis of the above embodiment, the above apparatus further includes: second sending module, second receiving module and second judgement module, wherein:

a second sending module, configured to send a measurement report to a source base station corresponding to a source cell; the measurement report is used for indicating the source base station to switch with a target base station corresponding to the target cell;

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

and the second judgment module is used for judging whether the tracking area of the target cell is consistent with the tracking area of the source cell or not according to the tracking area information of the source cell and the tracking area information of the target cell.

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

the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for receiving a first tracking area updating request and a second tracking area updating request sent by UE; the first tracking area updating request is sent after cell switching occurs to the UE in the process of TAU, and the second tracking area updating request is sent when the UE triggers the TAU;

a first sending unit, 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.

In one embodiment, as shown in fig. 19, there is provided a tracking area updating apparatus including: a third receiving module 21 and a third transmitting module 22, wherein:

a third receiving module 21, configured to receive the first tracking area update request and the second tracking area update request sent by the UE; the first tracking area updating request is sent after the UE is subjected to cell switching in the TAU process, and the second tracking area updating request is sent when the UE triggers the TAU;

a third sending module 22, 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 updating apparatus provided in this embodiment may perform the method embodiments, and the implementation principle and technical effects thereof are similar, which are not described herein again.

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

and a second sending unit, configured to send the tracking area update message to a target base station corresponding to cell handover if no tracking area update message is sent according to the second tracking area update request before the first tracking area update request and the second tracking area update request are received.

In an embodiment, on the basis of the above embodiment, the third sending module 22 further includes: a third transmitting unit, wherein:

and a third sending unit, configured to send a tracking area update message 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, and resend the tracking area update message to the target base station after receiving the first tracking area update request.

The various modules in the tracking area update apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent of a processor in the electronic device, or can be stored in a memory in the electronic device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, an electronic device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 20. The electronic device includes a processor, a memory, an Input/Output (I/O) interface, and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the electronic device is configured 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 operating system and the computer program to run in the non-volatile storage medium. The database of the electronic device is used for storing tracking area update data. The input/output interface of the electronic device is used for exchanging information between the processor and an external device. The communication interface of the electronic device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a tracking area update method.

In one embodiment, an electronic device is provided, which may be a terminal, and an internal structure thereof may be as shown in fig. 21. 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 by a system bus, and the communication interface, the display unit and the input device are connected by the input/output interface to the system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile 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 operating system and the running of the computer program in the non-volatile storage medium. The input/output interface of the electronic device is used for exchanging information between the processor and an external device. The communication interface of the electronic device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a tracking area update method. The display unit of the electronic equipment is used for forming a visual picture and can 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 equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.

It will be understood by those skilled in the art that the configurations shown in fig. 20 and 21 are only block diagrams of some configurations relevant to the present application, and do not constitute a limitation on the electronic devices to which the present application is applied, and a particular electronic device may include more or less components than those shown in the drawings, or may combine some components, or have a different arrangement of components.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the tracking area update method.

Embodiments of the present application also provide a computer program product containing instructions that, when run on a computer, cause the computer to perform a tracking area update method.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A tracking area update method, the method comprising:

in the process of updating TAU of a tracking area by user equipment UE, if cell switching occurs, judging whether the tracking area of a target cell is consistent with the tracking area of a 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 updating request to a Mobile Management Entity (MME); the content of the first tracking area update request is the same as the content of a second tracking area update request, and the second tracking area update request is sent when the UE triggers the TAU.

2. The method of claim 1, further comprising:

receiving a tracking area update message sent by the MME; and 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.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

acquiring a value of a preset first variable;

and if the value of the first variable is a first value, determining that the UE is subjected to cell switching in the TAU process.

4. The method of claim 1, further comprising:

sending a measurement report to a source base station corresponding to the source cell; the measurement report is used for indicating 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;

and judging whether the tracking area of the target cell is consistent with the tracking area of the source cell or not according to the tracking area information of the source cell and the tracking area information of the target cell.

5. The method of claim 4, wherein the sending the measurement report to the source base station corresponding to the source cell comprises:

acquiring a value of a preset second variable and the current rate of the UE;

if the value of the second variable is a second value and the current rate is smaller than a 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.

6. A tracking area update method, the method comprising:

receiving a first tracking area updating request and a second tracking area updating request sent by UE; the first tracking area update request is sent after the UE is subjected to cell switching in the process of TAU, and the second tracking area update request is sent when the UE triggers TAU;

and if the content of the first tracking area updating request is the same as the content of the second tracking area updating request, sending a tracking area updating message.

7. The method according to claim 6, wherein the first tracking area update request and the second tracking area update request each include an identifier of a source cell, and wherein if the content of the first tracking area update request and the content of the second tracking area update request are the same, sending a tracking area update message includes:

and if the tracking area updating message is not sent according to the second tracking area updating request before the first tracking area updating request and the second tracking area updating request are received, sending the tracking area updating message to a target base station corresponding to the cell switching.

8. The method according to claim 7, wherein the first tracking area update request and the second tracking area update request both include an identifier of a source cell, and wherein if the content of the first tracking area update request and the content of the second tracking area update request are the same, sending a tracking area update message includes:

and if the tracking area updating message is sent to the target base station corresponding to the cell handover according to the second tracking area updating request before the first tracking area updating request is received, the tracking area updating message is sent to the target base station again after the first tracking area updating request is received.

9. A tracking area update apparatus, comprising:

a first determining module, configured to determine whether a tracking area of a target cell is consistent with a tracking area of a source cell if cell handover occurs in a process of updating a TAU of the tracking area by a user equipment UE;

a first sending module, configured to send a first tracking area update request to a mobility management entity MME under a condition that a tracking area of the target cell is consistent with a tracking area of the source cell; the content of the first tracking area update request is the same as the content of a second tracking area update request, and the second tracking area update request is sent when the UE triggers the TAU.

10. A tracking area update apparatus, comprising:

a third receiving module, configured to receive the first tracking area update request and the second tracking area update request sent by the UE; the first tracking area update request is sent after the UE is subjected to cell switching in the process of TAU, and the second tracking area update request is sent when the UE triggers TAU;

11. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, wherein the computer program, when executed by the processor, causes the processor to carry out the steps of the tracking area update method according to any of claims 1 to 8.

12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.

13. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 8 when executed by a processor.