CN1988715B - A method for setting the duration of a periodic location update timer - Google Patents

Abstract

The invention relates to a method for setting the duration of a periodic location update timer. The network management of the location register sets and manages the duration of the periodic location update timers of all cells under the location register, and adjusts the periodic location according to the operating state of the mobile network. To update the value of the timer, the base station controller notifies the base station under its jurisdiction to broadcast the duration information of the new periodic location update timer in the system broadcast message, and the mobile station resets the periodic location update timer after receiving the system broadcast message. After the timer expires, a periodic location update is initiated. The method of the invention can conveniently adjust the duration of the periodical position update timer to realize the optimization of system performance.

Description

A method for setting the duration of a periodic location update timer

technical field

The invention relates to the field of wireless communication, in particular to a method for setting the duration of a periodic location update timer (T3212) in a WCDMA mobile communication system and a GSM mobile communication system.

Background technique

In the personal communication system, the system needs to know the location change of the mobile station MS and record it in the database to provide correct routing information for incoming calls. In the current mobile communication system, a two-layer centralized database is used to record the wireless access point of the user: the home location register (HLR) stores the subscription information of the home user and the number of the visitor location register (VLR) where the user is currently located; the VLR stores the visiting location register (VLR) number; A copy of the user's subscription information and current location area (LA) information. When the user's location information changes, the user will initiate a location update process to report the latest location information to the VLR, and when necessary, the VLR will initiate a process to update the relevant location information in the HLR database.

However, the HLR may fail and part of its database may be damaged. Although the database can be restored from backup data, the restored database is not up-to-date, and updates that occurred between the last backup and the failure are lost. In this case, the recovery of the location information in the HLR database depends on the active wireless access of the MS, that is, the MS initiates a call or enters a new location area to trigger a location update. If the MS stays at the same location for a long time or there are few outgoing calls, the system will cause a large number of incoming calls to fail because the recovery time of the database location information will be too long.

Therefore, the current system defines the periodic location update of the MS, and the upper limit of the recovery time of the location information is guaranteed through the regular active wireless contact of the MS. In addition to the function of user location information data recovery, periodic location updates have another important function.

In some cases, the system cannot grasp the status of the user in time, such as:

(1) The user's mobile phone automatically powers off.

(2) The user enters the blind zone.

(3) When the user sends the IMSI separation message to the system, the system cannot decode it correctly due to poor wireless channel transmission quality and high bit error rate.

When encountering the above situation, the system still thinks that the user is in the attached state or in the last registered cell for a long period of time. In this case, the system wastes part of radio resources to perform invalid paging for the incoming call. To avoid this, the system needs to have a way of discovering the user's disconnection. In the current system, the combination of stealth shutdown and periodic location update is an effective means to detect that the user is offline. If the system does not receive the user's registration message within a certain period of time, the user will be identified as a separate state in the VLR registered by the user, and the default is that the user is turned off. In this way, the system sets the duration of T3212 to be less than the duration of the implicit separation. If the user has contact with the system before the implicit separation timer expires, the implicit separation timer will retime. When the hidden separation timer expires, it can be determined that the user is offline.

In the current network operation, the duration of T3212 and the duration of the implicit separation timer are important parameters affecting the performance of the mobile network. In actual settings, the duration of T3212 must be smaller than the duration of the implicit separation timer. In addition, the duration of T3212 is set too Although short can improve the overall service performance of the network, it will greatly increase the network signaling traffic, reduce the utilization of wireless resources, and shorten the average standby time of the MS; if the hidden separation timer is set too large, the system will not be able to detect off-network in time users, resulting in a waste of wireless resources. Therefore, network operators need to carefully adjust the duration of these two timers according to the actual situation in order to achieve better system performance.

The current duration of T3212 is configured in the base station controller (BSC) in the GSM system, and is transmitted to the MS in the system message broadcast by each cell, as shown in FIG. 1 . WCDMA system is similar to this.

This method of setting the T3212 duration in the BSC will bring inconvenience in the following situations in actual use:

1. When the HLR fails, because the duration of T3212 guarantees the upper limit of the location information recovery time, if the operator wants to restore the user's latest location information in a short period of time, it needs to reduce the duration of T3212. According to the current method, the network operator needs to reset the duration of T3212 on the network management of multiple BSCs, and restore the original duration of T3212 in the network management of multiple BSCs after thinking that the HLR has recovered the latest location information of the user . The operation is more complicated.

2. When the network operator finds that the signaling traffic in a certain area increases and the VLR load is too large, it is necessary to increase the duration of T3212 to reduce the VLR load. At this time, the time length modification of T3212 needs to take into account the time length of the system implicit separation timer, so as to avoid the situation that the user is considered offline by the system even though the user is powered on and communicates with the system normally. However, currently T3212 is configured in the network management of the BSC, and the duration of the hidden separation timer is configured in the network management of the VLR. The cooperation of these two timers is prone to problems.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for setting the duration of the periodic location update timer. On the basis of setting the duration of the current periodic location update timer through the BSC network management, the network management setting of the VLR is added. The periodical location update timer is used to solve the inconvenience of modifying the periodical location update timer.

In order to achieve the above object, the present invention provides a method for setting the duration of a periodic location update timer, the method comprising the following steps:

Step 1, revise the duration of the periodic location update timer of the sub-district within the jurisdiction of the VLR through the network management of the VLR;

Step 2, the visitor location register sends a message to notify the base station controller, the message carries the list of cells and the duration of the corresponding periodic location update timer that needs to be modified;

Step 3, after receiving the message sent by the visitor location register to request modification of the periodic location update timer, the base station controller sends a message to notify the base station corresponding to the cell list carried in the message of modifying the periodic location update timer;

Step 4, after receiving the message from the base station controller, the base station broadcasts the duration information of the new periodic location update timer in the system broadcast message;

Step 5: The mobile station resets the periodic location update timer after receiving the system broadcast message, and initiates the periodic location update after the timer expires.

In the above-mentioned step 1, the following steps are included: creating or revising the periodic location update timer duration of all cells/some cells/a certain cell under a certain base station controller in the network management of the visitor location register; the network management of the visitor location register Check whether the duration of the periodic location update timer of a cell to be modified is less than the duration of the hidden separation timer. If it is larger, it means that there is a problem with the modification and needs to be modified again; otherwise, the network management of the visitor location register will send the modification information to the visitor location register.

The above modification information includes the duration information of the modified periodic location update timer and the list of cells that need to be modified.

In above-mentioned step 2, comprise the following steps: After receiving the modified periodic location update timer duration message sent by the network management, the visitor location register according to the cell list carried in the modified periodic location update timer duration message, and in advance in the network management After configuring the network information, find the base station controllers corresponding to these cells; the visitor location registers send messages to notify the corresponding base station controllers, and the messages carry the list of cells and the corresponding periodic location update timer duration that needs to be modified.

If the above network management message does not carry cell information, it means that all cells under the base station controller need to be modified.

In the above step three, the following steps are included: a. After the base station controller receives the message that the visitor location register requires modification of the duration of the periodic location update timer, it needs to check the list of cells carried in the message sent by the visitor location register. If the cell list If all or part of the cells in the cell are under the jurisdiction of the base station's visitor location register, the base station of the relevant cell is required to transmit the modified periodical location update timer duration in the system message broadcast by the cell; otherwise, ignore the message that is not in the base station controller List of districts under jurisdiction.

In the above-mentioned step three, the following steps are also included after step a: b, the base station controller needs to send a message to notify the network management of the base station controller that the duration of the periodic location update timer has been modified, and is recorded in the database by the network management of the base station controller , for future maintenance.

By adopting the method of the invention, the duration of the periodical position update timer can be adjusted conveniently, so as to realize the optimization of system performance.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Figure 1 is the setting method of the duration of the current periodic location update timer;

Fig. 2 is the mode of modifying the period length of the periodic location update timer by the VLR network management in the present invention.

Detailed ways

Fig. 2 shows the message flow of modifying the duration of the T3212 timer in the cell through the VLR network management. This schematic diagram takes the GSM system as an example, and it is also applicable to the WCDMA system. It can be understood that, in this simplified schematic diagram, the number of BSCs under the jurisdiction of the VLR and the number of BTSs under the jurisdiction of the BSC are not necessarily as shown in the figure. The order of sending messages required to modify the duration of the T3212 timer is represented by 1, 2, 3, and 4 respectively.

Now in conjunction with Fig. 2 the method described in the present invention is described further (taking GSM system as example, similar for WCDMA situation):

(1) The network operator finds that the signaling traffic of the cell under the jurisdiction of BTS2 increases, which affects network performance. Therefore, I want to increase the duration of the T3212 timer of this cell.

(2) The network operator resets the T3212 timer duration of this cell by referring to the implicit separation timer duration of the VLR through the VLR network management.

(3) The VLR network management checks whether the modified T3212 timer duration meets the condition that the T3212 timer duration is less than the hidden separation timer duration, and if not, an operator is required. If it is satisfied, the modified duration information of T3212 and the cell list to be modified are sent to the VLR, as shown in message 1 in FIG. 2 .

(4) After receiving the T3212 timer modification message sent by the network management, the VLR searches for the BSCs corresponding to these cells according to the list of cells carried in the message and the network information configured in the network management in advance. Carrying cell information means that it is necessary to modify the duration of the T3212 timer configured in all cells under this VLR. Then the VLR sends a message to notify the corresponding BSC (there may be one or more). The specific message format is not limited, but the message It needs to carry the duration information of T3212 and the list of cells that need to be modified under the BSC. The situation shown in Figure 2 is that the VLR decides to notify the cell where BTS1 under the jurisdiction of BSC1 is located to modify the duration of the T3212 timer, so only message 2 is sent to notify BSC1.

(5) BSC1 receives a message from the VLR requesting to modify the T3212 timer. Firstly, it needs to check whether the list of cells carried in this message is under the jurisdiction of the BSC, and ignore those cells that are not under the jurisdiction. For the cells under the jurisdiction, the BSC needs to read the network information configured in the BSC network management in advance, find the BTSs corresponding to these cells (there may be one or more), and then notify these BTSs to bring new T3212 timer duration information. The situation shown in Fig. 2 is that BSC1 informs BTS2 under its jurisdiction to broadcast new T3212 timer duration information in the system broadcast message through message 3 according to the message of VLR.

(6) After receiving the message from the BSC, the BTS broadcasts the new T3212 timer duration information in the system broadcast message. The situation shown in Fig. 2 is that BTS2 broadcasts new T3212 timer duration information according to the instruction of BSC1.

(7) After the MS receives the system broadcast message, it will reset the periodic location update timer according to the new T3212 timer duration information. After the timer expires, a periodic location update is initiated.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (7)

1. the method to set up of a periodical position renewing timer time length is characterized in that, this method comprises the steps:

Step 1, the webmaster by VLR Visitor Location Register are revised the duration of the periodical position renewing timer of the sub-district in the VLR Visitor Location Register administration;

Step 2, VLR Visitor Location Register sends the message informing base station controller, the duration that carries cell list in the message and need the corresponding periodical position renewing timer of modification;

Step 3, base station controller send the base station that message informing is revised cell list correspondence entrained in the message of periodical position renewing timer after receiving the message of the requirement modification periodical position renewing timer that VLR Visitor Location Register sends;

Step 4 after the message of base station As-received station control, is broadcasted the duration information of new periodical position renewing timer in system broadcast message;

Step 5, travelling carriage are reset periodical position renewing timer after receiving system broadcast message, behind this timer expiry, initiate periodic location update.

2. the method to set up of periodical position renewing timer time length according to claim 1 is characterized in that, in step 1, comprises following steps:

In the webmaster of VLR Visitor Location Register, create or revise periodical position renewing timer time length to whole sub-districts/some sub-district/certain sub-district under certain base station controller;

Whether the periodical position renewing timer time length of certain sub-district that the webmaster inspection of VLR Visitor Location Register is revised separates timer duration less than concealing, if greater than, then expression is this time revised problem, need remodify; Otherwise the webmaster of VLR Visitor Location Register sends to VLR Visitor Location Register with modification information.

3. the method to set up of periodical position renewing timer time length according to claim 2 is characterized in that, comprises the duration information of amended periodical position renewing timer and the cell list that needs are revised in this modification information.

4. the method to set up of periodical position renewing timer time length according to claim 2 is characterized in that, in step 2, comprises following steps:

After VLR Visitor Location Register is received the modification periodical position renewing timer time length message of webmaster transmission, according to revising entrained cell list in the periodical position renewing timer time length message, and in webmaster the pre-configured network information, search the pairing base station controller in these sub-districts;

VLR Visitor Location Register sends the message informing corresponding base station controller respectively, the corresponding periodical position renewing timer time length that carries cell list in the message and need to revise.

5. the method to set up of periodical position renewing timer time length according to claim 4 is characterized in that, if do not carry cell information in the webmaster message, then expression needs to revise all sub-districts under this base station controller.

6. the method to set up of periodical position renewing timer time length according to claim 4 is characterized in that, in step 3, comprises following steps:

After a, base station controller receive that the message of periodical position renewing timer time length is revised in the VLR Visitor Location Register requirement, entrained cell list in the message that needs inspection VLR Visitor Location Register sends, if all or part of sub-district then requires the base station of related cell to transmit amended periodical position renewing timer time length in the system message of Cell Broadcast CB under the administration of the VLR Visitor Location Register of this base station in the cell list; Otherwise ignore in the message the not cell list in the administration of this base station controller.

7. the method to set up of periodical position renewing timer time length according to claim 6 is characterized in that, in step 3, also comprises the following steps: after step a

B, base station controller need send the webmaster of message informing base station controller, and the duration of periodical position renewing timer is revised, are recorded in the database by the webmaster of base station controller, so that safeguard in the future.

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