CN111866842B - Tracking area updating method and device, terminal equipment and storage medium - Google Patents

Tracking area updating method and device, terminal equipment and storage medium Download PDF

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Publication number
CN111866842B
CN111866842B CN202010871378.4A CN202010871378A CN111866842B CN 111866842 B CN111866842 B CN 111866842B CN 202010871378 A CN202010871378 A CN 202010871378A CN 111866842 B CN111866842 B CN 111866842B
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tac
ping
forbidden
target
pong
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CN111866842A (en
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谢桂
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to CN202010871378.4A priority Critical patent/CN111866842B/en
Publication of CN111866842A publication Critical patent/CN111866842A/en
Priority to PCT/CN2021/107946 priority patent/WO2022042153A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the application discloses a tracking area updating method, a tracking area updating device, terminal equipment and a storage medium, and belongs to the technical field of communication. The method comprises the following steps: if the TAC changes, triggering a TAU flow; if the terminal equipment is in a TAC ping-pong state, adding a target TAC into the TAC forbidden list, wherein the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC except the current TAC in the TAC ping-pong state; if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list, the TAU flow triggered by the current TAC change event is forbidden. By adopting the scheme provided by the embodiment of the application, frequent updating of the tracking area in the TAC ping-pong state can be avoided, and the power consumption of the terminal equipment can be reduced and the transmission performance of the terminal equipment can be improved under the condition that the terminal equipment is positioned at the juncture of at least two tracking areas.

Description

Tracking area updating method and device, terminal equipment and storage medium
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a tracking area updating method, a device, terminal equipment and a storage medium.
Background
In a long term evolution (Long Term Evolution, LTE) system, tracking Area (TA) is a basic unit of location update and paging.
When the terminal equipment is attached, the mobile management node (Mobility Management Entity, MME) functional entity issues a tracking area identifier (Tracking Area Identity, TAI) list to the terminal equipment, and the tracking area identifier (Tracking Area Identity, TAI) list is stored by the terminal equipment. When a terminal device needs to be paged, the network initiates paging in all cells contained in the TAI list. When the terminal equipment moves in the cell included in the TAI list, the tracking area update (Tracking Area Update, TAU) process is not required to be triggered, and when the terminal equipment moves to a certain TA and the TA does not belong to the TAI list, the terminal equipment is required to trigger the TAU process so as to enable the MME to issue the TAI list to the terminal equipment again.
Disclosure of Invention
The embodiment of the application provides a tracking area updating method, a device, terminal equipment and a storage medium. The technical scheme is as follows:
in one aspect, an embodiment of the present application provides a method for updating a tracking area, which is applied to a terminal device, where the method includes:
if the tracking area code (Tracking Area Code, TAC) changes, triggering a TAU flow;
If the terminal equipment is in a TAC ping-pong state, adding a target TAC into a TAC forbidden list, wherein the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC except the current TAC in the TAC ping-pong state;
and if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list, forbidding a TAU flow triggered by the current TAC change event.
On the other hand, an embodiment of the present application provides an apparatus for updating a tracking area, which is applied to a terminal device, and the apparatus includes:
the updating module is used for triggering a TAU flow if the TAC changes;
the adding module is used for adding a target TAC to the TAC forbidden list if the terminal equipment is in a TAC ping-pong state, wherein the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC except the current TAC in the TAC ping-pong state;
and the holding module is used for prohibiting a TAU flow triggered by the current TAC change event if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list.
In another aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a processor and a memory; the memory stores at least one instruction for execution by the processor to implement the tracking area updating method as described in the above aspect.
In another aspect, a computer readable storage medium is provided, the storage medium storing at least one instruction for execution by a processor to implement the tracking area updating method as described in the above aspect.
In another aspect, embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the tracking area updating method provided in the above aspect.
In the embodiment of the application, the terminal equipment identifies whether the TAC is in the TAC ping-pong state currently according to the TAC change condition in the TAU process triggering process, and adds the target TAC in at least two TACs which are repeatedly changed to the TAC forbidden list when the TAC in the TAC forbidden list is identified, and when the TAC needs to be switched to the TAC in the TAC forbidden list again later, the terminal equipment can inhibit the TAU process, so that frequent updating of the tracking area in the TAC ping-pong state is avoided, and the terminal equipment is beneficial to reducing the power consumption of the terminal equipment and improving the transmission performance of the terminal equipment under the condition that the terminal equipment is positioned at the junction position of at least two tracking areas.
Drawings
FIG. 1 illustrates a block diagram of a communication system provided by an exemplary embodiment of the present application;
fig. 2 is a block diagram showing a structure of a terminal device according to an exemplary embodiment of the present application;
FIG. 3 is a schematic diagram illustrating the relationship between tracking areas in a tracking area list in accordance with an exemplary embodiment of the present application;
FIG. 4 is a flow chart illustrating a method for updating a tracking area according to an exemplary embodiment of the present application;
FIG. 5 is a flow chart illustrating a tracking area update method according to another exemplary embodiment of the present application;
FIG. 6 is a flowchart of a tracking area update method according to another exemplary embodiment of the present application;
FIG. 7 is a schematic diagram of an implementation of a tracking area update procedure provided by an exemplary embodiment of the present application;
FIG. 8 is a flowchart of a tracking area update procedure provided by an exemplary embodiment of the present application;
fig. 9 is a block diagram of a tracking area updating apparatus according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
References herein to "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Fig. 1 shows a block diagram of a communication system provided by an exemplary embodiment of the present application, which may include: access network device 12 and terminal device 13.
Access network device 12 includes a number of network devices 120 therein. The network device 120 may be a base station, which is a means deployed in an access network to provide wireless communication functionality for terminal devices. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different radio access technologies, the names of devices with base station functions may be different, for example, in LTE systems, called evolved Node bs (enodebs) or enbs; in a 5G NR-U system, it is called gNodeB or gNB. As communication technology evolves, the description of "base station" may change. For convenience, the above-mentioned devices for providing the terminal device 13 with the wireless communication function are collectively referred to as network devices.
The terminal device 13 may include various handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user devices, mobile Stations (MSs), terminal devices (terminal devices), and the like, having wireless communication functions. For convenience of description, the above-mentioned devices are collectively referred to as terminal devices. The network device 120 and the terminal device 13 communicate with each other via some kind of air interface technology, e.g. Uu interface.
The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD) system, long term evolution advanced (Advanced Long Term Evolution, LTE-a) system, new Radio (NR) system, evolution system of NR system, LTE (LTE-based access to Unlicensed spectrum, LTE-U) system on unlicensed frequency band, NR-U system, universal mobile telecommunication system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication system, wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, wiFi), next generation communication system or other communication system, etc.
The method for updating the tracking area provided by the embodiment of the present application is used for the terminal device 13 in the communication system shown in fig. 1, and the method provided by the embodiment of the present application may be used for a communication system that is further evolved even in a 3G system, a 4G system, and a 5G system, which is not limited in the embodiment of the present application.
Referring to fig. 2, a block diagram of a terminal device according to an exemplary embodiment of the present application is shown. The terminal device 13 in the present application may comprise one or more of the following components: processor 131, memory 132, receiver 133, and transmitter 134.
Processor 131 may include one or more processing cores. The processor 131 connects various parts within the entire terminal device 13 using various interfaces and lines, performs various functions of the terminal device 13 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 132, and invoking data stored in the memory 132. Alternatively, the processor 131 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 131 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processing unit (Graphics Processing Unit, GPU), a Neural network processing unit (Neural-network Processing Unit, NPU), a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the touch display screen; the NPU is used to implement artificial intelligence (Artificial Intelligence, AI) functionality; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 131 and may be implemented by a single chip.
The Memory 132 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (ROM). Optionally, the memory 132 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 132 may be used to store instructions, programs, code sets, or instruction sets. The memory 132 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described below, etc.; the storage data area may store data (such as audio data, phonebook) created according to the use of the terminal device 13, and the like.
The receiver 133 and the transmitter 134 may be implemented as one communication component, which may be a communication chip.
Optionally, the terminal device 13 may also include a display screen. The display screen is a display component for displaying a user interface. Optionally, the display screen also has a touch function, through which a user can perform a touch operation on the display screen using any suitable object such as a finger, a touch pen, or the like.
In addition to this, it will be appreciated by those skilled in the art that the structure of the terminal device 13 shown in the above-described drawings does not constitute a limitation of the terminal device, and the terminal device may include more or less components than illustrated, or may combine some components, or may be arranged in different components. For example, the terminal device 13 further includes a camera component, a radio frequency circuit, an input unit, a sensor (such as an acceleration sensor, an angular velocity sensor, a light sensor, etc.), an audio circuit, a wireless fidelity (Wireless Fidelity, wiFi) module, a power supply, a bluetooth module, etc., which are not described herein.
The TAI list issued by the MME functional entity to the terminal device includes at least one TAI, and there may or may not be an intersection between different TAI lists. Illustratively, as shown in FIG. 3, there is an intersection TA between TAI list 31 and TAI list 32, there is no intersection between TAI list 32 and TAI list 33, and there is no intersection between TAI list 31 and TAI list 33.
Correspondingly, the terminal equipment determines whether the tracking area update is needed or not based on the stored TAI list in the moving process. If the entered TA is in the TAI list, the terminal equipment does not need to trigger a TAU flow; if the incoming TA is located outside the TAI list, the terminal device does not need to trigger the TAU procedure. As shown in fig. 3, the terminal device is first located in TA3 and stores the TAI list 31 allocated by the MME functional entity. When moving from TA3 to TA6, since TA6 is located in the TAI list 31, the terminal device does not need to trigger the TAU procedure; when the terminal device moves further from TA6 to TA8, since TA8 does not belong to the TAI list 31, the terminal device needs to trigger the TAU procedure and the MME functional entity allocates the TAI list 32.
However, in some cases, when the terminal device is located in the border area of the cell corresponding to at least two TAs and at least two TAs belong to different TAI lists, a cell ping-pong reselection may occur to the terminal device (possibly caused by unreasonable network reselection parameter setting), and each cell ping-pong reselection triggers a TAU procedure.
Schematically, as shown in fig. 3, the terminal device is located between cells corresponding to TA8 and TA11, if the current serving cell is a cell corresponding to TA8, the terminal device switches to a cell corresponding to TA11 through cell reselection, and since TA11 does not belong to the TAI list 32, the terminal device needs to trigger a TAU procedure; if the current serving cell is the cell corresponding to TA11, the terminal device switches to the cell corresponding to TA8 through cell reselection, and since TA8 does not belong to the TAI list 33, the terminal device needs to trigger the TAU procedure.
Obviously, in the above case, cell ping-pong reselection may result in frequent updating of the TAU. In a standby state, frequent execution of TAU by the terminal device may cause a modem (modem) to fail to sleep, thereby increasing power consumption; for the dual-card single-pass terminal equipment, the data transmission performance of the main card can be affected when the auxiliary card frequently executes TAU.
In order to reduce the influence on the power consumption and the transmission performance of terminal equipment caused by frequent triggering of a TAU flow in the cell ping-pong reselection process, the embodiment of the application introduces the concept of a TAC forbidden list. By adopting the method provided by the embodiment of the application, when the TAC changes and triggers the TAU flow, the terminal equipment identifies the change condition of the TAC. When the TAC is identified to be in a TAC ping-pong state, that is, the TAC repeatedly changes between at least two TACs, the terminal equipment determines a target TAC different from the current TAC from the at least two repeatedly changed TACs and adds the target TAC into a TAC forbidden list, and when the subsequent TAC changes again and the TAC to be switched belongs to the TAC forbidden list, the terminal equipment cannot trigger a TAU flow, so that the terminal equipment can remain to reside in one stable TAC when the TAC is changed in a ping-pong manner, frequent execution of the TAU flow is avoided, power consumption of the terminal equipment is reduced, and transmission performance of the terminal equipment is improved. The following description uses exemplary embodiments.
Referring to fig. 4, a flowchart of a tracking area updating method according to an exemplary embodiment of the present application is shown. This embodiment is illustrated by way of example in which the method is performed by the terminal device 13 shown in fig. 1, the process comprising the steps of:
in step 401, if the TAC changes, the TAU procedure is triggered.
In one possible implementation, when a cell reselection occurs and the TAI of the reselected cell does not belong to the stored TAI list, the terminal device triggers a TAU procedure to update the locally stored TAI list and complete the cell reselection.
Schematically, as shown in fig. 3, when the terminal equipment reselects from the cell corresponding to TA8 to the cell corresponding to TA11, the TAC changes, and the changed TAC does not belong to the TAI list 32, so that the terminal equipment triggers the TAU procedure, acquires the TAI list 33, and reselects to the cell corresponding to TA 11.
Step 402, if the terminal device is in the TAC ping-pong state, adding a target TAC to the TAC forbidden list, where the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC other than the current TAC in the TAC ping-pong state.
In one possible implementation manner, when the TAC changes and triggers a TAU procedure, the terminal device records TAC before and after the change, so as to determine the TAC change condition according to a recorded series of TACs, and further identify whether the TAC is in a ping-pong state or not based on the TAC change condition.
It should be noted that, the terminal device only detects whether the TAC ping-pong state is in the case that the TAC changes and triggers the TAU procedure, and if the TAC changes but does not trigger the TAU procedure (for example, repeatedly switches between two TAs in the same TAI list), the terminal device does not need to perform TAC ping-pong state identification.
The ping-pong state of TACs is a state in which TACs are repeatedly changed (switched back and forth) between at least two TACs, and when a terminal device is located in a border area of a cell corresponding to a TA, if cell ping-pong reselection occurs, a phenomenon that TACs are repeatedly changed occurs. Schematically, as shown in fig. 3, when the terminal device is located in the border area of the cells corresponding to TA8 and TA11 and cell ping-pong reselection occurs, the terminal device is in a TAC ping-pong state, that is, switches back and forth between TACs corresponding to TA8 and TA 11.
Of course, if the terminal device is in the boundary area of the cells corresponding to three or more TAs, and performs ping-pong reselection between the three or more cells, the terminal device will also be in the TAC ping-pong state, which is not limited in the embodiment of the present application.
In the embodiment of the application, a TAC forbidden list is introduced, and when the TAC table tennis state is identified based on the change condition of the TAC, in order to avoid the follow-up frequent execution of TAU flow, the terminal equipment determines the target TAC from at least two TACs which are repeatedly changed, and adds the target TAC to the TAC forbidden list. Wherein the target TAC is the other TAC except the current TAC of the at least two repeatedly changed TACs.
Schematically, as shown in fig. 3, TAC a corresponding to TA8 and TAC B corresponding to TA11, when the terminal device is located in the boundary area between the cells corresponding to TA8 and TA11, if a cell ping-pong reselection occurs, the terminal device recognizes that the TAC will switch between TAC a and TAC B. If the current serving cell is the cell corresponding to TA8, the terminal device determines the TAC B as the target TAC, and adds the TAC B to the TAC forbidden list.
It should be noted that the above embodiment is described only by taking the case where a single TAC is added to the TAC disabled list, and when the terminal device repeatedly changes between three or more TACs, the terminal device adds at least two target TACs to the TAC disabled list. For example, when it is recognized that there is a repeated change among TAC a, TAC B, TAC C, and the terminal device currently resides in a cell corresponding to TAC a, the terminal device adds TAC B and TAC C to the TAC disabled list.
In step 403, if the TAC changes again and the TAC to be switched belongs to the TAC disabling list, the TAU procedure triggered by the current TAC change event is disabled.
After adding the target TAC to the TAC disabled list, when the subsequent TAC changes again, the terminal device detects whether the TAC to be switched (at this time, the TAC does not actually change) belongs to the TAC disabled list. If the TAU belongs to the TAC, determining that the TAC is still in the TAC ping-pong state, further prohibiting the TAU flow triggered by the current TAC change event, and keeping the TAC. Optionally, when the TAC changes during cell reselection and the TAC to be switched belongs to the TAC forbidden list, the terminal device will continue to reside in the current serving cell by prohibiting the TAU procedure, but cell reselection will not be performed.
It should be noted that, the above-mentioned TAU prohibiting procedure is only applicable to the current TAC changing event, if the subsequent TAC changes again, the terminal device needs to re-detect whether the TAC to be switched belongs to the TAC prohibiting list, and re-trigger the TAU procedure when the TAC does not belong.
Schematically, as shown in fig. 3, the current TAC is TAC a, and TAC B is added to the TAC disabling list, and when TAC changes again due to cell reselection, since the TAC B to be switched belongs to the TAC disabling list, the terminal device maintains the current TAC a, and disables the TAU procedure, thereby maintaining to reside in the cell corresponding to the TAC a.
Obviously, compared with the TAU triggered according to the normal flow when the TAC ping-pong change occurs in the related art, the TAU is triggered according to the normal flow in the embodiment of the application, the TAC ping-pong state is identified, and the TAC forbidden list is set, so that the TAC forbidden list is used for forbidden repeated change among TACs, and the power consumption of the terminal equipment can be reduced in the standby state; for the double-card single-standby terminal equipment, reducing the TAU frequency of the auxiliary card can improve the transmission performance of the main card.
In summary, in the embodiment of the present application, the terminal device identifies whether the terminal device is currently in the TAC ping-pong state according to the TAU change condition in the TAU procedure triggering process, and adds the target TAC in at least two TACs that are repeatedly changed to the TAC disabling list when the terminal device identifies the TAC in the TAC ping-pong state, and when the terminal device needs to switch to the TAC in the TAC disabling list again subsequently, the terminal device can inhibit the TAU procedure, so that frequent update of the tracking area in the TAC ping-pong state is avoided, and the power consumption of the terminal device is reduced and the transmission performance of the terminal device is improved when the terminal device is located at the boundary position of at least two tracking areas.
In order to avoid that when the ping-pong state of the TAC disappears due to the fact that the target TAC is located in the TAC forbidden list for a long time, the terminal equipment cannot switch to the TA corresponding to the target TAC. The following description uses exemplary embodiments.
Referring to fig. 5, a flowchart of a tracking area updating method according to another exemplary embodiment of the present application is shown. This embodiment is illustrated by way of example in which the method is performed by the terminal device 13 shown in fig. 1, the process comprising the steps of:
in step 501, if the TAC changes, a TAU procedure is triggered.
The implementation of this step may refer to step 401 described above, and this embodiment is not described herein again.
Step 502, acquiring a TAC change sequence within a predetermined time period, where the TAC change sequence is used to characterize TAC change conditions.
In one possible implementation manner, the terminal device stores and maintains a TAC change sequence, and when the TAC changes and triggers a TAU procedure, the terminal device adds the changed TAC to the TAC change sequence so as to identify the change condition of the TAC in the TAU procedure based on the TAC change sequence. Optionally, the TAC change sequence further includes TAC change moments corresponding to the TACs.
Correspondingly, when the TAU flow is triggered, the terminal equipment adds the changed TAU into the TAC change sequence, and identifies whether the TAC change sequence contains repeated TACs.
In step 503, if the TAC change sequence includes repeated TACs and the TAC repetition number is greater than the number threshold, it is determined that the terminal device is in the TAC ping-pong state.
In one possible scenario, when the user moves back and forth between cells corresponding to different TAs, at least two TACs will also change repeatedly, and accordingly, the TAC change sequence will also include repeated TACs. However, since such a TAC repeated change is not caused by cell ping-pong reselection but by normal cell reselection triggered by normal movement of the terminal device, this situation should not be regarded as a TAC ping-pong change.
In order to distinguish between the repeated change of the normal TAC and the repeated change of the TAC caused by the ping-pong reselection of the cell, in one possible implementation manner, the terminal device identifies whether the repeated TAC is contained in the TAC change sequence within a predetermined time period, and whether the number of repeated TACs within the predetermined time period is greater than a number threshold.
If the TAC change sequence includes repeated TACs and the TAC repetition number in the predetermined time period is greater than the number threshold, it indicates that the TAC repetition change is caused by cell ping-pong reselection (because the frequency of cell ping-pong reselection is higher compared with cell reselection triggered by normal movement of the terminal device), and then it is determined that the current TAC is in the TAC ping-pong state.
If the TAC change sequence includes repeated TACs and the TAC repetition number in the predetermined time period is smaller than the number threshold, it indicates that the TAC repetition change is not caused by cell ping-pong reselection, and further it is determined that the TAC is not in the current TAC ping-pong state, and further it is not necessary to execute subsequent procedures.
In an illustrative example, the predetermined time period is 30 seconds, and the threshold number of times is 4, that is, when the number of times of occurrence of the TAC of the first TAC within 30 seconds is greater than 4 times, the terminal device determines that the TAC is in the ping-pong state.
In one possible implementation, as shown in fig. 6, this step may include the following steps, with respect to the manner in which whether the TAC sequence contains repeated TACs, and the number of TACs that occur are determined.
In step 503A, if repeated TAC appears in the TAC change sequence for the first time, a first timer is started, and the TAC repetition number is initialized, where the timer duration of the first timer is a predetermined duration.
In one possible implementation, after completing the TAU procedure and adding a new TAC to the TAC change sequence, the terminal detects whether the new TAC is repeated with the historical TAC in the TAC change sequence. If the newly added TAC is repeated with the historical TAC, the occurrence of the repeated TAC is determined (the newly added TAC is the repeated TAC). When detecting that repeated TAC appears for the first time in the TAC change sequence, the terminal equipment starts a first timer and initializes the TAC repetition number, wherein the timer duration of the first timer is a preset duration, and the initialized TAC repetition number is 1.
In order to avoid that when the newly added TAC is consistent with the history TAC that is far away from each other (possibly because the TAC changes due to movement of the terminal), it is determined that the TAC ping-pong occurs by mistake, in another possible implementation manner, after finishing the TAU procedure and adding the TAC to the TAC change sequence, the terminal device detects whether the newly added TAC is repeated with the history TAC in the TAC change sequence, if the newly added TAC is detected to be repeated with the history TAC, it further detects whether the TAC change time interval between the newly added TAC and the history TAC is smaller than the interval threshold, if the TAC change time interval is smaller than the interval threshold, the first timer is started, and if the TAC change time interval is larger than the interval threshold, the first timer is not started. For example, the interval threshold is 20s.
Schematically, as shown in fig. 7, the terminal device enters the tracking area a at 10:00:00 and triggers the TAU procedure, thereby adding TAC a to the TAC change sequence 71; the terminal equipment enters a tracking area B at a ratio of 10:00:03 and triggers a TAU flow, so that TAC B is added to a TAC change sequence 71; the terminal re-enters the tracking area a at 10:00:06 and triggers the TAU procedure to add TAC a to the TAC change sequence 71. Since the repeated TACs (i.e., TAC a) occur in the TAC change sequence 71, the interval (i.e., 6 s) between the repeated TACs is smaller than the interval threshold, the terminal starts the first timer 72 (the timer duration is 30 s) and initializes the TAC repetition number to 1.
In step 503B, if the repeated TAC appears again in the TAC change sequence, the TAC repetition number is updated.
And in the timing duration of the first timer, if the TAC changes again and triggers the TAU flow, the terminal equipment acquires the repeated TAC (different from the repeated TAC at last time) and updates the repeated times of the TAC. For example, the terminal device performs an operation of adding one to the TAC repetition number.
Schematically, as shown in fig. 7, when the terminal device reenters the tracking area a at 10:00:12 and triggers the TAU, the terminal device adds the TAC a to the TAC change sequence 71, and determines that the TAC a is a repeated TAC because the TAC change sequence 71 already includes the TAC a, so as to update the TAC repetition number to 2 (at this time, the first timer is 6 s).
When the terminal device reenters the tracking area B at 10:00:09 and triggers the TAU, the terminal device adds the TAC B to the TAC change sequence 71, and determines that the TAC B is a repeated TAC because the TAC change sequence 71 already contains the TAC B, so that the TAC repetition number is updated to 3 (at this time, the first timer is 3 s).
Similarly, when the first timer reaches 9s, the terminal device adds TAC B to the TAC change sequence 71 and updates the TAC repetition number to 4.
In step 503C, if the TAC repetition number in the timer duration of the first timer is greater than the number threshold, it is determined that the mobile device is in the TAC ping-pong state.
In a possible implementation manner, after updating the TAC repetition number each time, the terminal device detects that the TAC repetition number is greater than the number threshold, and if so, determines that the TAC is in a ping-pong state; or when the first timer reaches the time length of the timer, the terminal equipment detects whether the repeated times of the TAC are larger than a time threshold, and if so, the terminal equipment determines that the terminal equipment is in a TAC ping-pong state.
Schematically, as shown in fig. 7, when the count threshold is set to 3 times, since the TAC repetition count reaches 4 times when the timer duration of the first timer reaches 9s, the terminal device determines that it is in the TAC ping-pong state.
Step 504, determining a target TAC from the repeated TACs, and adding the target TAC to the TAC forbidden list.
Further, the terminal device determines the target TAC from the repeated TACs, so that the target TAC is added to the TAC forbidden list. The repeated TAC can be determined from the TAC change sequence by the terminal equipment.
In one possible embodiment, when the repeated TACs are at least two, the terminal device determines the repeated TACs other than the current TAC as the target TAC.
Schematically, as shown in fig. 7, when it is determined that the TAC is in the ping-pong state, since the repeated TAC includes TAC a and TAC B and the current TAC is TAC B, the terminal determines TAC a as the target TAC and adds the target TAC to the TAC disable list 73.
It should be noted that, in this embodiment, only two TACs are taken as an example to be switched back and forth, and in other possible embodiments, when switching back and forth between at least three TACs, the terminal device adds at least two TACs except the current TAC to the TAC disabling list, which is not limited in this embodiment.
In step 505, a disable time period is set for the target TAC.
In one possible embodiment, the terminal device sets a fixed disable period for the target TAC, for example, the disable period is set to 5 minutes.
However, if the ping-pong state of the TAC is still sustained, frequent TAU may still occur after the target TAC is removed from the TAC disable list. Therefore, in order to further reduce the situation of frequent TAU caused by cell ping-pong reselection, in another possible implementation, the terminal device sets a dynamically increasing disabling duration for the target TAC according to the occurrence number of the TAC ping-pong states.
In one possible embodiment, as shown in fig. 6, this step may include the following steps.
In step 505A, if the terminal device is in the TAC ping-pong state, the number of TAC ping-pong state wheels is updated, where the number of TAC ping-pong state wheels is used to characterize the occurrence number of TAC ping-pong states.
In one possible implementation, the terminal device stores and maintains a TAC ping-pong state number (round), and updates the TAC ping-pong state number each time the TAC ping-pong state is identified. For example, the number of the ping-pong state wheels of the TAC is added by one.
Schematically, as shown in fig. 7, when the number of times of repeating the TAC reaches 4, the terminal device determines that the TAC ping-pong state occurs, so that the number of wheels of the TAC ping-pong state is added by one, and the current number of wheels of the TAC ping-pong state is 1.
Step 505B, determining the disabling duration according to the number of ping-pong state rounds of the TAC.
For the manner of determining the forbidden duration based on the number of TAC ping-pong state rounds, in one possible implementation manner, the terminal device first determines a candidate forbidden duration according to the number of TAC ping-pong state rounds, and then determines the minimum value of the candidate forbidden duration and the forbidden duration upper limit as the forbidden duration, where the candidate forbidden duration and the TAC ping-pong state rounds are in positive correlation, that is, as the number of TAC ping-pong state rounds increases, the longer the holding duration of the target TAC in the TAC forbidden list is, and correspondingly, the longer the duration of the terminal device for prohibiting the TAU is.
In one illustrative example, the candidate disable duration is exponentially related to the number of TAC ping-pong state rounds. For example, candidate disabled duration=2 round Wherein round is the number of TAC ping-pong state wheels.
For example, when the number of the current TAC ping-pong state rounds is 1, the candidate disabling duration is 2min; when the number of the current TAC ping-pong state rounds is 4, the candidate disabling duration is 16min.
In order to avoid unlimited increase of the forbidden duration and influence on normal TAU of the terminal equipment, the terminal equipment is provided with an forbidden duration upper limit, and when the candidate forbidden duration is smaller than the forbidden duration upper limit, the terminal equipment determines the candidate forbidden duration as the forbidden duration; and when the candidate forbidden time length is greater than the forbidden time length upper limit, the terminal equipment determines the forbidden time length upper limit as the forbidden time length.
For example, when the upper limit of the disabling period is 720min, the disabling period determined according to the number of TAC ping-pong state rounds may be expressed as min (2 round ，720)。
Of course, the terminal device may also determine the incremental candidate disabling time periods in other manners, and the embodiment of the present application is only schematically illustrated by way of example in the above manner, but is not limited thereto.
In step 505C, a second timer is set for the target TAC according to the disabling duration, where the timer duration of the second timer is the disabling duration.
Further, the terminal device sets a second timer for the target TAC according to the determined disabling time length, so as to trigger the removal operation of the target TAC through the second timer.
Illustratively, as shown in fig. 7, the terminal device determines that the disabling time period of the TAC a is 2min.
If the disable duration is reached, the target TAC is removed from the TAC disable list, step 506.
Optionally, if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list in the timer duration (i.e. forbidden duration) of the second timer, the terminal device keeps the current TAC; when the second timer reaches the timer duration, the terminal device removes the target TAC from the TAC disable list.
In one possible implementation manner, the number of the TAC ping-pong state rounds is not reset when the disabling duration is reached, that is, when the TAC ping-pong state is recognized again later, the terminal device continues to accumulate the number of the current TAC ping-pong state rounds, so that the disabling time of the TAC is prolonged.
Optionally, after removing the target TAC from the TAC disable list, the terminal device performs TAC update on the original TAC change sequence, or regenerates a new TAC change sequence and updates the TAC change sequence, which is not limited in this embodiment.
In step 507, if the TAC changes again and the TAC to be switched belongs to the TAC disabling list, the TAU procedure triggered by the current TAC change event is disabled.
The implementation of this step may refer to step 403, and this embodiment is not described herein.
In this embodiment, the terminal device communicates by constructing the TAC change sequence, and determines whether TAC ping-pong occurs by identifying repeated TACs in the TAC change sequence, thereby improving the accuracy of identifying the TAC ping-pong state; in addition, in this embodiment, the terminal device determines the incremental TAC disabling duration according to the number of TAC ping-pong state rounds, and prolongs the removing duration of TAC in the TAC disabling list in the TAC ping-pong state, so as to further reduce the TAU frequency in the TAC ping-pong state, reduce the power consumption of the terminal device, and improve the transmission performance.
In an illustrative example, the flow of tracking area update by the terminal device is shown in fig. 8.
Step 801 camping on a 4G cell.
Step 802, cell ping-pong reselection.
Step 803, detect if TAC changes. If the TAC changes, go to step 804; if the TAC is unchanged, step 802 is performed.
Step 804, trigger TAU procedure.
In step 805, it is detected whether the number of repeated TACs (count) is 0. If 0, step 806 is performed, and if not 0, step 807 is performed.
In step 806, a timer T1 is started, and the duration of the timer T1 is 30s.
Step 807, the number of repeated TACs is incremented by one.
Step 808, detect if the number of repeated TACs within 30s reaches 4. If so, step 809 is performed, and if not, step 802 is performed.
Step 809, add one to the TAC ping-pong state number (round).
Step 810, adding the repeated TAC to the TAC disabled list, and setting a timer T2 for the repeated TAC, the timer duration of the timer T2 being min (2 round ，720)。
In the above embodiment, taking the disabling time period as the removal trigger condition as an example, the TAC removing process in the TAC disabling list is described. However, in some special cases, the terminal device needs to remove the TAC in the TAC disabling list in time, so as to avoid the influence of TAC disabling on the normal updating of the tracking area of the terminal device.
In one possible implementation, when the removal condition is satisfied, the terminal device removes the target TAC from the TAC disable list.
Wherein the removal conditions include at least one of:
1. the TAC changes and the TAC to be switched does not belong to the TAC disabled list.
When the terminal equipment moves and cell reselection is caused by the movement, and then a TAU flow is triggered, in order to ensure normal execution of cell reselection, the terminal equipment needs to remove the target TAC from the TAC list. Optionally, when the TAC changes, the terminal device detects whether the TAC to be switched belongs to the TAC forbidden list, and if not, triggers a removal flow of the target TAC.
In other possible embodiments, the terminal device may also determine, according to the geographical location information or the sensor data, whether the TAC change is caused by the movement of the terminal device, which is not limited in this embodiment.
2. The cell signal strength of the current serving cell is less than the signal strength threshold.
During the target TAC disabling period, if the signal strength of the cell in the current serving cell is poor, the cell remaining in the current serving cell may cause network drop, so in one possible implementation manner, the terminal device continuously measures the signal strength of the cell, for example, the reference signal received strength (Reference Signal Receiving Power, RSRP) in the process of remaining in the current serving cell, and removes the target TAC from the TAC disabling list when the signal strength of the cell in the current serving cell is less than the signal strength threshold, so that the terminal device can reselect the cell corresponding to the target TAC through the cell, thereby avoiding the network drop condition. For example, when the RSRP of the current serving cell is less than-115 dbm, the terminal device removes the target TAC from the TAC disable list.
3. Re-accessing the network.
Optionally, the terminal device re-accessing to the network may be implemented by switching on/off the terminal device, switching on/off the flight mode, or plugging in/out the SIM card (all network attachment needs to be re-performed), i.e. when detecting that the terminal device is switching on/off the terminal device, switching on/off the flight mode, or plugging in/out the SIM card, the terminal device removes the target TAC from the TAC disable list.
4. The network system changes.
Because the terminal device can support multiple network modes at the same time, and when the TAC ping-pong occurs under the current network mode, the situation of TAC ping-pong may not exist under other network modes, when the network mode changes, the terminal device also removes the target TAC from the TAC forbidden list.
For example, when the ping-pong state of the TAC is identified in the 4G network system and the target TAC is added to the TAC disable list, if the terminal device is switched from the 4G network system to the 3G network system, the terminal device will remove the TAC in the TAC disable list.
Optionally, when the removal condition is met, the terminal device resets the number of TAC ping-pong state rounds while removing the target TAC from the TAC disable list, so as to avoid that TAC added to the TAC disable list later is disabled for too long time due to the number of TAC ping-pong state rounds not being reset.
In this embodiment, the terminal device sets the removal condition, and when the removal condition is satisfied, removes the TAC in the TAC disabling list in time, and on the premise of alleviating the ping-pong state of the TAC, avoids the influence of TAC disabling on the normal use of the terminal device.
Referring to fig. 9, a block diagram of a tracking area updating apparatus according to an embodiment of the application is shown. The apparatus may be implemented as all or part of the terminal device 13 in fig. 1 by software, hardware or a combination of both. The device comprises:
The updating module 901 is configured to trigger a TAU procedure if the TAC changes;
an adding module 902, configured to add, if the terminal device is in a TAC ping-pong state, a target TAC to a TAC forbidden list, where the TAC ping-pong state refers to a state that a change between at least two TACs is repeated, and the target TAC is a TAC other than the current TAC in the TAC ping-pong state;
the maintaining module 903 is configured to prohibit a TAU procedure triggered by a current TAC change event if the TAC changes again and the TAC to be switched belongs to the TAC prohibition list.
Optionally, the adding module 902 includes:
the sequence acquisition unit is used for acquiring a TAC change sequence in a preset time length, wherein the TAC change sequence is used for representing the TAC change condition;
the state determining unit is used for determining that the terminal equipment is in the TAC ping-pong state if the TAC change sequence contains repeated TACs and the number of times of TAC repetition is greater than a number threshold;
and the adding unit is used for determining the target TAC from the repeated TACs and adding the target TAC to the TAC forbidden list.
Optionally, the state determining unit is configured to:
if repeated TAC appears in the TAC change sequence for the first time, a first timer is started, the TAC repetition number is initialized, and the timer duration of the first timer is the preset duration;
If repeated TACs appear in the TAC change sequence again, updating the TAC repetition times;
and if the TAC repetition number is greater than the number threshold in the timer duration of the first timer, determining that the TAC is in the TAC ping-pong state.
Optionally, the apparatus includes:
a time length setting module, configured to set a forbidden time length for the target TAC;
and the first removing module is used for removing the target TAC from the TAC forbidden list if the forbidden duration is reached.
Optionally, the duration setting module includes:
the number of wheels updating unit is used for updating the number of wheels of the TAC ping-pong state if the terminal equipment is in the TAC ping-pong state, wherein the number of wheels of the TAC ping-pong state is used for representing the occurrence number of the TAC ping-pong state, and the number of wheels of the TAC ping-pong state is not reset when the forbidden duration is reached;
a time length determining unit for determining the forbidden time length according to the number of the TAC ping-pong state wheels;
and the time length setting unit is used for setting a second timer for the target TAC according to the forbidden time length, wherein the timer time length of the second timer is the forbidden time length.
Optionally, the duration determining unit is configured to:
Determining candidate forbidden duration according to the TAC ping-pong state number of rounds, wherein the candidate forbidden duration and the TAC ping-pong state number of rounds are in positive correlation;
and determining the minimum value of the candidate forbidden duration and the forbidden duration upper limit as the forbidden duration.
Optionally, the apparatus further includes:
and the second removing module is used for removing the target TAC from the TAC forbidden list if the removing condition is met.
Optionally, the removal condition includes at least one of:
the TAC changes, and the TAC to be switched does not belong to the TAC forbidden list;
the signal intensity of the cell of the current serving cell is smaller than a signal intensity threshold value;
re-accessing the network;
the network system changes.
Optionally, the second removing module is configured to:
and if the removal condition is met, removing the target TAC from the TAC forbidden list, and resetting the number of TAC ping-pong state rounds.
In summary, in the embodiment of the present application, the terminal device identifies whether the terminal device is currently in the TAC ping-pong state according to the TAU change condition in the TAU procedure triggering process, and adds the target TAC in at least two TACs that are repeatedly changed to the TAC disabling list when the terminal device identifies the TAC in the TAC ping-pong state, and when the terminal device needs to switch to the TAC in the TAC disabling list again later, the terminal device can inhibit the TAU procedure and keep the current TAC, so that frequent update of the tracking area in the TAC ping-pong state is avoided, and the terminal device is facilitated to reduce power consumption of the terminal device and improve transmission performance of the terminal device when the terminal device is located at the junction position of at least two tracking areas.
In this embodiment, the terminal device communicates by constructing the TAC change sequence, and determines whether TAC ping-pong occurs by identifying repeated TACs in the TAC change sequence, thereby improving the accuracy of identifying the TAC ping-pong state; in addition, in this embodiment, the terminal device determines the incremental TAC disabling duration according to the number of TAC ping-pong state rounds, and prolongs the removing duration of TAC in the TAC disabling list in the TAC ping-pong state, so as to further reduce the TAU frequency in the TAC ping-pong state, reduce the power consumption of the terminal device, and improve the transmission performance.
In this embodiment, the terminal device sets the removal condition, and when the removal condition is satisfied, removes the TAC in the TAC disabling list in time, and on the premise of alleviating the ping-pong state of the TAC, avoids the influence of TAC disabling on the normal use of the terminal device.
Embodiments of the present application also provide a computer readable medium storing at least one instruction that is loaded and executed by a processor to implement the tracking area updating method described in the above embodiments.
Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the tracking area updating method provided in the above aspect.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but rather, the application is to be construed as limited to the appended claims.

Claims (10)

1. A method for updating a tracking area, applied to a terminal device, the method comprising:
if the tracking area code TAC changes, triggering a tracking area updating TAU flow;
if the terminal equipment is in a TAC ping-pong state, adding a target TAC into a TAC forbidden list, wherein the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC except the current TAC in the TAC ping-pong state;
If the terminal equipment is in the TAC ping-pong state, updating the number of TAC ping-pong state wheels, wherein the number of TAC ping-pong state wheels is used for representing the occurrence times of the TAC ping-pong state;
setting a forbidden duration for the target TAC according to the TAC table tennis state number, wherein the TAC table tennis state number is not reset when the forbidden duration is reached;
setting a second timer for the target TAC according to the forbidden duration, wherein the timer duration of the second timer is the forbidden duration; if the forbidden duration is reached, removing the target TAC from the TAC forbidden list;
and if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list, forbidding a TAU flow triggered by the current TAC change event.
2. The method of claim 1, wherein adding the target TAC to the TAC disable list if the terminal device is in a TAC ping-pong state, comprises:
acquiring a TAC change sequence in a preset time length, wherein the TAC change sequence is used for representing the TAC change condition;
if the TAC change sequence contains repeated TAC and the number of repeated TAC is greater than a number threshold, determining that the terminal equipment is in the TAC ping-pong state;
And determining the target TAC from the repeated TACs, and adding the target TAC to the TAC forbidden list.
3. The method of claim 2, wherein if the TAC variation sequence includes repeated TACs and the TAC repetition number is greater than a number threshold, determining that the terminal device is in the TAC ping-pong state includes:
if the repeated TAC appears in the TAC change sequence for the first time, a first timer is started, the TAC repetition number is initialized, and the timer duration of the first timer is the preset duration;
if the repeated TAC appears in the TAC change sequence again, updating the repeated times of the TAC;
and if the TAC repetition number is greater than the number threshold in the timer duration of the first timer, determining that the terminal equipment is in the TAC ping-pong state.
4. The method of claim 1, wherein the determining the disabling time period from the TAC ping-pong state number of rounds comprises:
determining candidate forbidden duration according to the TAC ping-pong state number of rounds, wherein the candidate forbidden duration and the TAC ping-pong state number of rounds are in positive correlation;
and determining the minimum value of the candidate forbidden duration and the forbidden duration upper limit as the forbidden duration.
5. A method according to any one of claims 1 to 3, wherein after adding the target TAC to the TAC disable list, the method further comprises:
and if the removal condition is met, removing the target TAC from the TAC forbidden list.
6. The method of claim 5, wherein the removal conditions include at least one of:
the TAC changes, and the TAC to be switched does not belong to the TAC forbidden list;
the signal intensity of the cell of the current serving cell is smaller than a signal intensity threshold value;
re-accessing the network;
the network system changes.
7. The method of claim 6, wherein the removing the target TAC from the TAC disable list if a removal condition is met comprises:
and if the removal condition is met, removing the target TAC from the TAC forbidden list, and resetting the number of TAC ping-pong state rounds.
8. An updating device of a tracking area, applied to a terminal device, characterized in that the device comprises:
the updating module is used for triggering the tracking area updating TAU flow if the tracking area code TAC changes;
the adding module is used for adding a target TAC to the TAC forbidden list if the terminal equipment is in a TAC ping-pong state, wherein the TAC ping-pong state refers to a state in which at least two TACs repeatedly change, and the target TAC is a TAC except the current TAC in the TAC ping-pong state;
The time length setting module is used for updating the number of TAC ping-pong state wheels if the terminal equipment is in the TAC ping-pong state, wherein the number of TAC ping-pong state wheels is used for representing the occurrence times of the TAC ping-pong state;
the time length setting module is further configured to set a forbidden time length for the target TAC according to the TAC ping-pong state number of wheels, where the TAC ping-pong state number of wheels is not reset when the forbidden time length is reached;
the time length setting module is further configured to set a second timer for the target TAC according to the forbidden time length, where the timer time length of the second timer is the forbidden time length;
the first removing module is used for removing the target TAC from the TAC forbidden list if the forbidden duration is reached;
and the holding module is used for prohibiting a TAU flow triggered by the current TAC change event if the TAC changes again and the TAC to be switched belongs to the TAC forbidden list.
9. A terminal device, characterized in that the terminal device comprises a processor and a memory; the memory stores at least one instruction for execution by the processor to implement the tracking area updating method of any one of claims 1 to 7.
10. A computer readable storage medium storing at least one instruction for execution by a processor to implement the tracking area updating method of any one of claims 1 to 7.
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