CN107567091B - Location area updating method and mobile station - Google Patents
Location area updating method and mobile station Download PDFInfo
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- CN107567091B CN107567091B CN201610511674.7A CN201610511674A CN107567091B CN 107567091 B CN107567091 B CN 107567091B CN 201610511674 A CN201610511674 A CN 201610511674A CN 107567091 B CN107567091 B CN 107567091B
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Abstract
The embodiment of the invention provides a location area updating method and a mobile station. The location area updating method comprises the following steps: after the mobile station fails to establish the radio resource control connection for four times continuously, the mobile station starts a periodic location updating timer, wherein the periodic location updating timer is set according to the duration of the periodic location updating timer which is broadcast and sent by a base station and received by the mobile station; if the mobile station detects a trigger event during the time period that the periodic location update timer is not overtime, the mobile station triggers a location area update process. Therefore, the CS service of the mobile station is recovered in time under the condition of not increasing the extra power consumption of the mobile station, so that the mobile station can normally receive the short message or the telephone in time, and the problem that the RRC connection is recovered to be normal but the MS still cannot receive the called service is effectively avoided.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a location area updating method and a mobile station.
Background
In order to determine the location of a Mobile Station (MS), each GSM (Global System for Mobile Communication) coverage area is divided into a plurality of location areas, and a location area may include one or more cells. The network will store the location area of each mobile station as location information for paging the mobile station. Specifically, a Mobile Switching Center (MSC) registers the Location of the Mobile station, and sends a Location Area Code (LAC) to the Mobile station in the Location Area through a system message on a broadcast channel of all cells in the Location Area.
According to the difference of the network identifier to the location update, the location update can be divided into three types: normal location update (i.e., location update across location areas), periodic location update, and International Mobile Subscriber Identity (IMSI) attach (corresponding to user power-on). The normal Location update means that when the mobile station moves from one Location Area to another Location Area, the mobile station must register in the new Location Area, that is, once the mobile station needs or finds that the Location Area Identity (LAI) in its memory is different from the LAI of the current cell, the network side is notified to change the Location information of the mobile station stored in the network side. The periodic location update means that the mobile station does not have a mobile location area for a long time, and does not initiate any service, at this time, the location of the current mobile station needs to be periodically reported to the network side, and the network side marks that the MS is in an activated state after receiving the location, otherwise, the MS is considered to be in a deactivated state (i.e., a power-off state). IMSI attach refers to a location update procedure initiated when a mobile station is powered on, reporting that a network side MS enters an active state. When the location update is performed, the MS first needs to establish a wireless link with the network side, and then sends a signaling message on the link. When any type of location updating process is initiated, if the radio link establishment fails, the MS starts a 15s timer for retry according to the current 3GPP protocol specification, and if three retries are all radio link establishment failures, a periodic location updating timer T3212 is started, where the time for the commercial network of the timer is generally 1-2 hours (too short configuration may cause an increase in network load). During this time, the network does not send a Paging message (Paging) to the MS, i.e., the MS cannot receive other people's telephone or telecommunications traffic even if the radio link is restored.
Therefore, when the MS wants to initiate the location update procedure, if the radio link establishment fails for four consecutive times, the problem that the called service cannot be received typically in 1 to 2 hours occurs, and during this period, the problem that the radio link is recovered to be normal but the MS still cannot receive the called service occurs.
Disclosure of Invention
Embodiments of the present invention provide a location area update method and a mobile station, which recover a CS service of the mobile station in time without increasing additional power consumption of the mobile station.
In a first aspect, an embodiment of the present invention provides a location area updating method, including:
after the mobile station fails to establish the radio resource control connection for four times continuously, the mobile station starts a periodic location updating timer, wherein the periodic location updating timer is set according to the duration of the periodic location updating timer which is broadcast and sent by a base station and received by the mobile station;
if the mobile station detects a trigger event during the time period that the periodic location update timer is not overtime, the mobile station triggers a location area update process.
In this implementation manner, during the period that the periodic location update timer T3212 is not overtime, if the mobile station detects a trigger event, the mobile station immediately triggers a location area update procedure, and when the radio link between the base station and the mobile station is recovered, the location area update procedure can be successfully completed, so as to recover the CS service of the mobile station in time, so that the mobile station can receive a short message or a call normally in time, thereby avoiding the recovery of the radio link between the base station and the mobile station, but the mobile station still can still not receive a short message or a call normally while waiting for the periodic location update timer T3212 to be overtime.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the triggering event includes any one of that the establishment of the radio resource control connection is successful when the packet switched service is initiated, the signal quality of the cell is greater than a first preset value, and the signal quality of the cell after the cell changes and the changed signal quality of the cell is greater than a second preset value.
In this implementation manner, the triggering event specifically includes any one of the successful establishment of the radio resource control connection during the group switching service, the signal quality of the cell being greater than the first preset value, and the signal quality of the cell being changed and being greater than the second preset value, where the occurrence of any one of the triggering events can indicate that the radio link is possibly restored, thereby triggering a location area update procedure once, and restoring the CS service of the mobile station in time, so that the mobile station can receive the short message or the telephone normally in time, and can effectively improve the success probability of the location area update procedure, and reduce the power consumption waste caused by frequent initiation.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first preset value is greater than the second preset value.
In a second aspect, an embodiment of the present invention provides a location area updating method, including:
after the mobile station fails to establish the radio resource control connection for four times continuously, the mobile station sets the time length of the periodic position updating timer as a plurality of preset time lengths;
the mobile station starts a periodic location update timer;
when the periodic location updating timer reaches a preset time length, the mobile station triggers a location area updating process once;
the sum of the durations of the preset durations is smaller than the duration of a periodic location updating timer broadcast and sent by the base station.
The realization mode can timely recover the CS service of the mobile station under the condition of not increasing the extra power consumption of the mobile station, so that the mobile station can timely and normally receive the short message or the telephone, and the problem that the RRC connection is recovered to be normal but the MS still can not receive the called service is effectively avoided.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the preset time periods are sequentially increased.
In the implementation mode, the time length of the periodic position updating timer is set to be a plurality of preset time lengths, and the preset time lengths are sequentially increased, so that the power consumption waste of the mobile station caused by frequently initiating the position area updating process can be effectively avoided.
In a third aspect, an embodiment of the present invention provides a mobile station, including:
a processing module, configured to start a periodic location update timer after a mobile station fails to establish radio resource control connection for four consecutive times, where the periodic location update timer is set according to a duration of the periodic location update timer that is broadcast and sent by a base station and received by the mobile station;
the processing module is further configured to trigger a location area update procedure once through the sending module if a trigger event is detected during a time when the periodic location update timer is not timed out.
In a fourth aspect, an embodiment of the present invention provides a mobile station, including:
the mobile station comprises a processing module, a processing module and a processing module, wherein the processing module is used for setting the time length of a periodic position updating timer into a plurality of preset time lengths after the mobile station fails to establish the wireless resource control connection for four times continuously;
the processing module is further used for starting a periodic location update timer;
the processing module is further configured to trigger a location area updating process through the sending module once the periodic location updating timer reaches a preset duration;
the sum of the durations of the preset durations is smaller than the duration of a periodic location updating timer broadcast and sent by the base station.
In the location area updating method and the mobile station of the embodiment of the invention, after the mobile station fails to establish the radio resource control connection for four times continuously, the mobile station starts the periodic location updating timer, and during the period that the periodic location updating timer is not overtime, if the mobile station detects a trigger event, the mobile station triggers a location area updating process once, so that the CS service of the mobile station is recovered in time under the condition that the extra power consumption of the mobile station is not increased, the mobile station can receive short messages or calls in time normally, and the problem that the RRC connection is recovered normally, but the MS still cannot receive the called service is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of a second generation wireless communication system architecture;
FIG. 2 is a diagram of a third generation wireless communication system architecture;
FIG. 3 is a flowchart of a location area update method according to a first embodiment of the present invention;
FIG. 4 is a flowchart of a second embodiment of a location area update method of the present invention;
FIG. 5 is a flowchart of a third embodiment of a location area update method of the present invention;
FIG. 6 is a block diagram of a mobile station according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a mobile station according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a diagram of a second generation wireless communication system architecture, and fig. 2 is a diagram of a third generation wireless communication system architecture. The location area updating method of the embodiment of the present invention is applicable to the wireless communication systems shown in fig. 1 and fig. 2, and may specifically be perfection and optimization of the mobility management procedures of the wireless communication systems shown in fig. 1 and fig. 2. As shown in fig. 1, the second generation wireless communication System includes an MS, a Base Transceiver Station (BTS), a Base Station Controller (BSC), a Mobile Switching Center (MSC), a Visitor Location Register (VLR), an HLR (Home Location Register)/AUC, a Packet Control Unit (PCU), a GPRS service Support Node (SGSN), a Charging Gateway (CG), a Domain Name Server (DNS), a Gateway GPRS Support Node (GGSN), and a Border Gateway (BG). The MS is connected with the BTS, and the BTS is responsible for the transceiving function of wireless signals and realizes the communication between a wireless network system and the MS. The BTS is connected with the BSC, and the BSC is responsible for controlling and managing the BTS, establishing and tearing down call connection, controlling power, managing radio resources and providing stable and reliable radio connection for upper-layer service through soft/hard switching. The BSC is respectively connected with the PCU and the MSC/VLR, wherein the MSC/VLR is connected with a Public Switched Telephone Network (PSTN) and an Integrated Services Digital Network (ISDN), and the MSC/VLR is also connected with the HLR/AUC, wherein the MSC is responsible for call establishment, route selection, call control, wireless resource distribution, user mobility management, position registration, channel switching in a switching area, ticket information generation, service coordination with the PSTN, and the like, and completes No.7 signaling, a Network interface and the like. The VLR stores subscriber temporary information (all data necessary to establish a call) roaming to the local MSC area, physically co-located with the MSC. The HLR/AUC is responsible for a database managed by the mobile subscriber, stores subscriber account opening information (telecommunication service subscription data and subscriber state), mobile station position information, MDN, IMSI (MIN) and the like, and the AUC is a functional entity for managing the mobile station authentication related information and is physically combined with the HLR. PCU is connected to SGSN, CG, DNS, GGSN and BG are connected through GPRS backbone network, BG is also connected to other PLMN network (other PLMN), GGSN is also connected to Ethernet network. The PCU is used to process data traffic and separate data traffic from GSM voice traffic, and has the main functions of: data grouping, radio channel management, error transmission detection and automatic retransmission. The SGSN mainly completes the functions of routing forwarding, mobility management, session management, logical link management, authentication and encryption, ticket generation and output and the like of the grouped data packets. The GGSN may protocol convert GPRS packets in the GSM network so that they may be transmitted to a remote TCP/IP or x.25 network. BG is used for interconnecting GPRS backbone networks among PLMNs, and has basic security function and related functions added according to roaming agreement among operators. The border gateway may be a separate physical entity or may be co-located with the GGSN. CG communicates with charging entities in GPRS network such as GSN through Ga interface, which is used to collect and charge the charging data record sent by each GSN. The DNS is responsible for providing domain name resolution and APN resolution of network nodes such as SGSN, GGSN and the like in the GPRS network.
As shown in fig. 2, the difference between the third generation wireless communication system and the second generation wireless communication system is mainly that a Mobile Equipment (Mobile Equipment, abbreviated as ME) accesses a wireless communication network through a Node B, where the Node B is a name of a Mobile base station arriving in a 3G network, and is interconnected with an RNC through a standard Iub interface, and mainly comprises a control subsystem, a transmission subsystem, a radio frequency subsystem, an intermediate frequency/baseband subsystem, a feedback subsystem, and the like. Node B is connected with MSC/VLR and SGSN through Radio Network Controller (RNC), and Gateway Mobile Switching Center (GMSC) is set between MSC/VLR and PSTN and ISDN. The RNC is a key element of a 3G radio network, and is a component of an access network, and is used to provide mobility management, call processing, link management, and handover mechanisms. The GMSC requests routing information for the calling mobile subscriber and also provides internetworking and accounting functions.
The location area updating method of the embodiment of the invention can be executed by MS in a 2G wireless communication system or by ME in a 3G wireless communication system, and the location area updating process of the embodiment of the invention can recover the circuit switching CS service of the MS or the ME in time under the condition of not increasing the extra power consumption of the MS or the ME, so that the MS or the ME can receive short messages or calls normally in time. The location area updating method according to the embodiment of the present invention is explained in detail in the following embodiments.
Fig. 3 is a flowchart of a first embodiment of a location area updating method according to the present invention, as shown in fig. 3, the method of this embodiment may include:
step 101, after the mobile station fails to establish the radio resource control connection for four consecutive times, the mobile station starts a periodic location update timer.
The periodic location updating timer is set according to the duration of the periodic location updating timer broadcast and sent by the base station received by the mobile station.
Specifically, when the mobile station initiates the location area update procedure, if the radio resource control RRC connection establishment fails, the mobile station starts the timer for 15s, after 15s, the mobile station retries, if the retry or the RRC connection setup fails, the mobile station starts the timer again for 15s, and after 15s, the mobile station retries again, if the retry or RRC connection setup fails, the mobile station starts the timer again for 15s, after 15s, the mobile station retries again, if the retry is also an RRC connection establishment failure, the mobile station starts a periodic location update timer T3212, the duration of the periodic location update timer T3212 is set by the mobile station according to the duration configured in the system message broadcast by the base station, the duration of the periodic location update timer T3212 is typically 1 to 2 hours (too short a duration configuration may cause an increase in network load).
Step 102, during the period that the periodic location updating timer is not overtime, if the mobile station detects a trigger event, the mobile station triggers a location area updating process.
Specifically, during the period that the periodic location update timer T3212 is not timed out, if the mobile station detects a trigger event, the mobile station immediately triggers a location area update procedure. When the wireless link between the base station and the mobile station is recovered, the location area updating process can be successfully completed, so that the CS service of the mobile station can be timely recovered, the mobile station can timely and normally receive the short message or the telephone, and the problem that the mobile station cannot normally receive the short message or the telephone when the wireless link between the base station and the mobile station is recovered, but the mobile station still waits for the overtime of the periodic location updating timer T3212 is solved.
The triggering event may specifically include any one of successful establishment of radio resource control connection when initiating a packet switched PS service, a cell signal quality greater than a first preset value, and a cell change and a changed cell signal quality greater than a second preset value. Of course, the triggering event may also be other events, which are not illustrated here.
Specifically, during the period that the periodic location update timer T3212 is not overtime, if the mobile station detects that the RRC connection is successfully established when the mobile station initiates the PS service, or the mobile station detects that the signal quality of the current cell of the mobile station is greater than a first preset value, or the mobile station detects that the cell of the mobile station changes and the signal quality of the changed cell is greater than a second preset value, the mobile station immediately triggers a location area update procedure. That is, during the period that the periodic location update timer T3212 is not overtime, the mobile station actively triggers a location area update procedure according to a trigger event, and when the radio link between the base station and the mobile station is recovered, the location area update procedure can be successfully completed, so as to recover the CS service of the mobile station in time, so that the mobile station can receive short messages or calls normally in time. The first preset value can be equal to or larger than the second preset value, and specific values can be flexibly set according to requirements.
The specific implementation manner that the mobile station detects that the cell changes and the signal quality of the changed cell is greater than the second preset value may be: the mobile station receives a broadcast message sent by the base station, wherein the broadcast message carries a cell identifier (cell ID), the mobile station judges whether the current cell identifier is the same as the previously received cell identifier, if so, the mobile station further acquires the signal quality of the current cell, and judges whether the signal quality of the current cell is greater than a second preset value, and if so, the mobile station detects a trigger event.
In this embodiment, after the mobile station fails to establish the radio resource control connection for four consecutive times, the mobile station starts a periodic location update timer, and during the period that the periodic location update timer is not overtime, if the mobile station detects a trigger event, the mobile station triggers a location area update procedure, so that the CS service of the mobile station is recovered in time without increasing the extra power consumption of the mobile station, so that the mobile station can receive a short message or a telephone in time, and the problem that the RRC connection is recovered to be normal, but the MS still cannot receive the called service is effectively avoided.
Fig. 4 is a flowchart of a second embodiment of the location area updating method of the present invention, as shown in fig. 4, the method of this embodiment may include:
step 201, after the mobile station fails to establish the radio resource control connection for four consecutive times, the mobile station sets the duration of the periodic location update timer to a plurality of preset durations.
Specifically, the mobile station continuously fails to establish the radio resource control connection four times specifically means that, when the mobile station initiates the location area update procedure, if the radio resource control RRC connection establishment fails, the mobile station starts a 15s timer, after 15s, the mobile station retries, if the mobile station retries or fails to establish the RRC connection, the mobile station restarts the 15s timer, after 15s, the mobile station retries again, and if the mobile station retries or fails to establish the RRC connection. After the mobile station has failed to establish the RRC connection for four consecutive times, the mobile station sets the duration of its own periodic location update timer to a plurality of preset durations, e.g., T1, T2, etc. Specifically, T1 may be set to be greater than T2, i.e., the preset time periods are sequentially increased.
Step 202, the mobile station starts a periodic location update timer.
Step 203, when the periodic location update timer reaches a preset duration, the mobile station triggers a location area update procedure once.
The sum of the durations of the preset durations is smaller than the duration of a periodic location updating timer broadcast and sent by the base station.
Specifically, the location area update procedure may be triggered once when the periodic location update timer reaches T1, and may be triggered once again when the periodic location update timer reaches T2.
In this embodiment, after the mobile station fails to establish the radio resource control connection for four consecutive times, the mobile station sets the duration of the periodic location update timer to a plurality of preset durations and starts the periodic location update timer, and when the periodic location update timer reaches every preset duration, the mobile station triggers a location area update procedure once, where a sum of the durations of the preset durations is smaller than the duration of the periodic location update timer broadcast by the base station, so that the CS service of the mobile station is timely recovered without increasing additional power consumption of the mobile station, so that the mobile station can timely and normally receive a short message or a telephone call, and the problem that the RRC connection is recovered to be normal but the MS still cannot receive the called service is effectively avoided.
Fig. 5 is a flowchart of a third embodiment of a location area update method of the present invention, and this embodiment specifically explains a specific implementation of a location area update procedure triggered by a mobile station in the foregoing embodiment, and as shown in fig. 5, the method of this embodiment may include:
s301, the MS sends an RRC connection request message to the BSC.
S302, the BSC sends an RRC connection establishment message to the MS.
S303, the MS sends an RRC connection establishment completion message to the BSC.
S301 to S303 are RRC Connection Setup steps (RRC Connection Setup).
S304, the MS sends an initial direct transfer message to the BSC.
S305, BSC sends the initial MS message to MSC.
S304 to S305 are Location Update steps (Location Update).
S306, the MSC sends an encryption command to the BSC.
S307, the BSC sends the encryption command to the MS.
S308, the MS sends an encryption completion message to the BSC.
S309, BSC sends the encryption completion message to MSC.
Wherein, S306 to S308 are Security Mode procedures (Security Mode Procedure).
S310, MSC sends the receiving information of the location updating to BSC.
S311, BSC sends the location update acceptance message to MS.
S312, the MS sends a TMSI reallocation completion message to the BSC.
S313, BSC sends the TMSI reallocation complete message to MSC.
S309 to S312 are Location Update acceptance steps (Location Update Accept).
The method further comprises a disconnecting process after the steps, and specifically comprises Iu connection release and RRC connection release.
Fig. 6 is a schematic structural diagram of a mobile station according to a first embodiment of the present invention, and as shown in fig. 6, the apparatus of this embodiment may include: a processing module 11 and a sending module 12, where the processing module 11 is configured to start a periodic location update timer after a mobile station fails to establish radio resource control connection for four consecutive times, the periodic location update timer is set according to a duration of the periodic location update timer that is broadcast and sent by a base station and received by the mobile station, and the processing module 11 is further configured to trigger a location area update procedure through the sending module 12 if a trigger event is detected during a time period when the periodic location update timer is not overtime.
Optionally, the triggering event includes any one of that the establishment of the radio resource control connection is successful when the packet switching service is initiated, the signal quality of the cell is greater than a first preset value, and the cell changes and the changed signal quality of the cell is greater than a second preset value.
Optionally, the first preset value is greater than the second preset value.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic structural diagram of a second mobile station according to an embodiment of the present invention, and as shown in fig. 7, the apparatus of this embodiment may include: a processing module 21 and a sending module 22, where the processing module 21 is configured to set a duration of a periodic location update timer to a plurality of preset durations after the mobile station fails to establish radio resource control connection for four consecutive times, the processing module 21 is further configured to start the periodic location update timer, and the processing module 21 is further configured to trigger a location area update procedure through the sending module 22 when the periodic location update timer reaches every preset duration; the sum of the durations of the preset durations is smaller than the duration of a periodic location updating timer broadcast and sent by the base station.
Optionally, the preset durations are sequentially increased.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 4, and the implementation principle and the technical effect are similar, which are not described herein again.
It should be noted that the transmitting module 12 in the embodiment of the present invention may correspond to a transmitter of a mobile station, and may also correspond to a transceiver of the mobile station. The Processing module 11 may correspond to a processor of the mobile station, where the processor may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits that implement the embodiments of the present invention. The mobile station may further include a memory for storing instruction codes, and the processor calls the instruction codes of the memory to control the sending module 12 in the embodiment of the present invention to perform the above-mentioned operations.
The transmitting module 22 in the embodiment of the present invention may correspond to a transmitter of a mobile station, and may also correspond to a transceiver of the mobile station. The processing module 21 may correspond to a processor of the mobile station, where the processor may be a CPU, or an ASIC, or one or more integrated circuits that implement embodiments of the present invention. The mobile station may further include a memory for storing instruction codes, and the processor calls the instruction codes of the memory to control the sending module 22 in the embodiment of the present invention to perform the above-mentioned operations.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A location area update method, comprising:
after the mobile station fails to establish the radio resource control connection for four times continuously, the mobile station starts a periodic location updating timer, wherein the periodic location updating timer is set according to the duration of the periodic location updating timer which is broadcast and sent by a base station and received by the mobile station;
if the mobile station detects a trigger event during the time period that the periodic location updating timer is not overtime, the mobile station triggers a location area updating process;
the triggering event comprises any item of successful establishment of radio resource control connection when the packet switching service is initiated, the signal quality of the cell is greater than a first preset value, and the signal quality of the cell after the cell changes is greater than a second preset value.
2. The method of claim 1, wherein the first preset value is greater than the second preset value.
3. A mobile station, comprising:
a processing module, configured to start a periodic location update timer after a mobile station fails to establish radio resource control connection for four consecutive times, where the periodic location update timer is set according to a duration of the periodic location update timer that is broadcast and sent by a base station and received by the mobile station;
the processing module is further configured to trigger a location area update procedure once through the sending module if a trigger event is detected during a time when the periodic location update timer is not overtime;
the triggering event comprises any item of successful establishment of radio resource control connection when the packet switching service is initiated, the signal quality of the cell is greater than a first preset value, and the signal quality of the cell after the cell changes is greater than a second preset value.
4. The mobile station of claim 3, wherein the first predetermined value is greater than the second predetermined value.
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