JP2000050349A - Position information management method for subscriber in mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manage position information with respect to a subscriber correctly by selecting only meaningful messages and processing them in the case that position registration and call processing proceduce are requested in duplicate to the same subscriber when the position registration is executed from a visitor position registration device to a home position registration device as a mobile terminal moves. SOLUTION: In this mobile communication system that includes a home position registration device HLR, a mobile exchange station MSC and many visitor position registration devices VLR, a position information management method for subscribers includes a step where the state of execution of position registration procedure is displayed while the normal position registration procedure is executed with respect to position registration to be requested in the case that an optional visitor position registration device requests position registration, a step where a new position registration request or a new routing request is processed for its error in the case that the new position registration is requested or the new routing is requested in the state that the position registration is under execution and a step where a subscriber record with respect to a concerned mobile terminal is maintained in a preceding visitor position registration device when a reject message is received with respect to the new position registration request or the new routing request.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for managing location information of a subscriber in a mobile communication system, and more particularly, to a method for managing a location of a visitor from a visitor location register to a home location register when a subscriber of mobile communication moves to an arbitrary area. When the location registration and call processing procedures are duplicated and requested for the same subscriber when performing location registration, the home location registrar selects and processes only the meaningful message, and the home location is registered. The present invention relates to a location information management method for a subscriber in a mobile communication system in which a registration device and a visitor location registration device always maintain location information for the subscriber correctly.

[0002]

BACKGROUND OF THE INVENTION Generally, code division multiple access (CDMA)
A digital mobile communication system using the system includes a home location register (HLR) and a visitor location register (VLR). The home location register has a database function for managing additional service information, location information, and the like for all mobile communication network subscribers. A visitor location register is used by a mobile switching center to retrieve information for a subscriber who has visited any area or to process a call from a subscriber. Therefore, the home location register should maintain accurate information for a plurality of mobile communication network subscribers, and transfer temporary information generated when a plurality of mobile communication network subscribers move to a single visitor. The location register must be maintained.

However, at present, the mobile communication standard (IS-41)
-C) has no provision for handling specific situations,
When a subscriber of another mobile communication network attempts to connect a call, the home location register may fail to provide accurate subscriber information and the call may frequently fail.

FIG. 6 is a flow chart showing a location registration procedure of a subscriber in a normal mobile communication, in which an arbitrary mobile terminal MS1 is shifted from a previous service system area (an area where a first visitor location register VLR1 is located). New service system area (area where the second visitor location register VLR2 is located)
The case of moving to is shown.

[0005] As the mobile terminal MS1 moves, the second visitor location register VLR2 of the new service system.
Detects the mobile terminal MS1 and detects the home location register HLR.
The home location register HLR sends the location registration request message of the mobile terminal MS1 to the mobile terminal MS1 (ST1).
The location of 1 is updated in the database and stored. At this time, the first visitor location register VLR1 of the previous service system.
Has a subscriber record for the mobile terminal MS, the home location register HLR requests the first visitor location register VLR1 to delete the location for the mobile terminal MS (ST2). Then, the first visitor location register VLR1 operates the mobile terminal M stored in the database.
The subscriber record for S1 is deleted, and a response message of a location deletion request of the mobile terminal MS1 is sent to the home location register HLR (ST3). The home location register HLR that has received the response message of the location deletion request sends a response message of the location registration request of the mobile terminal MS1 to the second visitor location register VLR2 (ST4). by this,
The second visitor location register VLR2 can generate a subscriber record for the mobile terminal MS1 in the database.

FIG. 7 is a flowchart showing a call processing procedure of a normal mobile communication subscriber, in which a calling mobile terminal calls a desired called mobile terminal MS2 in an arbitrary service system area. If requested, the flow of operation between the originating mobile switching center MSC, the home location register HLR and the terminating mobile switching center MSC1 is shown.

When the originating mobile terminal calls the called mobile terminal MS2, the corresponding mobile switching center MSC of the calling mobile terminal sends the called mobile terminal MS2 to the home location register HLR. Is transmitted (ST11). The home location register HLR, having received the location request message, determines the routing information for the mobile station MS2 on the called side, and determines the routing information for the mobile station MS2 on the called side.
A routing request message for S2 is sent to the corresponding mobile switching center MSC1 via the first visitor location register VLR1 of the called mobile terminal MS2 (ST12). The called mobile switching center MSC1 receives the routing request message,
Routing information (TLDN; temporary local director)
y number). At this time, the first visitor location register VLR1 has a subscriber record for the mobile terminal MS. If the routing information of the called mobile terminal MS2 is obtained, the corresponding mobile switching center MSC1 sends a response message of the routing request of the called mobile terminal MS2 to the home location register HLR (ST13). The home location register HLR that has received the routing request response message sends a location request response message to the called mobile terminal MS2 to the originating mobile switching center MSC (ST14).

However, if the home location register HLR has incorrect location information with respect to the called mobile terminal MS2 for unknown reasons, the call processing procedure of the mobile communication subscriber will be described. It is as follows. First, as shown in the lower part of FIG. 7, the originating mobile switching center MSC sends a location request message to the destination mobile terminal MS2 to the home location register HLR (ST21). The home location register HLR receiving the location request message,
A routing request message is sent to the first visitor location register VLR1 of the called mobile terminal MS2 in order to know the location information of the called mobile terminal MS2 (ST22). At this time, since the first visitor location register VLR1 does not have a subscriber record for the mobile terminal, the first visitor location register VLR1 may indicate that the subscriber is an unrecognizable subscriber. An error message of the routing request to the mobile station MS2 is sent to the home location register HLR together with the error code (ST23).

At this time, the home location register HLR initializes the subscriber location information stored in its own database (ST24). The home location register HLR,
To the mobile switching center MSC on the calling side, the mobile terminal MS2 on the called side
Is sent to notify that there is no routing information requested by the originating mobile switching center MSC (ST25), and the call is not established.

FIG. 8 shows that when an arbitrary mobile terminal MS3 moves from an area where a previous service system is provided to an area where a new service system is provided, the location information of a mobile communication subscriber is two or more. It is a flowchart explaining the error respectively registered and duplicated in the visitor location register.

As any mobile terminal MS3 moves from the area where the previous service system is provided to the area where the new service system is provided, the second visitor location register VLR2 of the new service system area is Detects the mobile terminal MS3 and requests the home location register HLR to perform primary location registration for the mobile terminal MS3 (ST
1). The home location register HLR stores the location update and the previous location of the mobile terminal MS3 in a database. At this time, the first visitor location register VLR1 is connected to the mobile terminal MS.
3, the home location register HLR requests the first visitor location register VLR1 to delete the location of the mobile terminal MS3 (ST2).

However, at this time, due to an error, the second visitor location register VLR2 sends the home location register HLR 2
If there is a next location registration request (ST3), the home location register HLR normally responds to the location registration request without a location deletion request procedure because the location registration request has been made again by the location registered system. I do. Accordingly, the home location register HLR sends a response message for a secondary location registration request of the mobile terminal MS3 to the second visitor location register VLR2 (ST4). As a result, a subscriber record for the mobile terminal MS3 is generated in the second visitor location register VLR2.

On the other hand, a location deletion request for the mobile terminal MS3 requested from the home location register HLR to the first visitor location register VLR1 is executed for a reason such as a busy state of the mobile terminal. If not, the first
The visitor location register VLR1 sends a rejection message of the location deletion request of the mobile terminal MS2 to the home location register HLR.
(ST5). Therefore, the home location register HLR rejects the request to delete the location of the mobile terminal MS2, so that the location of the mobile terminal MS3 is previously provided with the service system by the first visitor location register VLR1.
The stored contents of the database are restored so as to be re-registered, and the mobile terminal M is transmitted to the second visitor location register VLR2.
Sends a rejection message for the primary registration request in S3 (ST
6).

Then, a location deletion request (ST2) generated from the home location register HLR to the first visitor location register VLR1, or the first visitor location register VL.
If a response is lost in the rejection step (ST5) of the location deletion request generated from R1 to the home location register HLR, the home location register HLR operates in the same manner.

However, 1 for the mobile terminal MS3.
Even if the next location registration fails, the second visitor location register VL
The R2 database already has a secondary location registration request (ST
3) has a subscriber record for the mobile terminal MS3, and the subscriber record formed in the database of the first visitor location register VLR1 has not been deleted. Record exists in both of the two visitor location registers VLR1 and VLR2.

[0016] In this method, when the home location register and the visitor location register have wrong information for the corresponding subscriber, another mobile terminal may call for a call. , The home location register cannot execute normal call processing.

FIG. 9 shows that when an arbitrary mobile terminal MS4 moves to an area where a new service system is provided, the location registration and call processing shown in FIGS. 10 is a signal processing flowchart for explaining an error that may occur when a procedure overlaps.

When any mobile terminal MS4 moves to the area where the new service system is provided, the second visitor location register VLR2 in the area where the new service system is provided senses the mobile terminal MS4 and homes. A request for position registration is made to the position register HLR (ST31). The home location register HLR updates the location of the mobile terminal MS4 in the database and stores its previous location. At this time, since the first visitor location register VLR1 has a subscriber record for the mobile terminal MS4, the home location register HLR sends the first visitor location register VLR1 to the mobile terminal MS4. Request to delete location of MS4 (S
T32), the first visitor location register V
The subscriber record for the mobile terminal MS4 owned by the LR1 is deleted.

Here, the first visitor location register VLR
1 when the subscriber record for the mobile terminal MS4 is successfully deleted, the first visitor location register VLR1.
Transmits to the home location register HLR a location deletion request response message notifying that the subscriber record of the mobile terminal MS4 has been deleted (ST38). As a result, for the first time, the home location register HLR transmits a response message to the location registration request requested by the second visitor location register VLR2 to the second visitor location register VLR2 (S
T39), and upon receiving the response message, the second visitor location register VLR2 generates a subscriber record for the mobile terminal MS4 in the database.

However, before the location registration requested by the second visitor location register VLR2 ends normally, any mobile switching center MSC that does not request location registration sends the same mobile terminal MS4 to the same mobile terminal MS4. If the location request message is transmitted (ST33), home location register H
The LR attempts to obtain the routing information TLDN by sending a routing request message to the new service system since the location information of the corresponding subscriber stored in its database has already been changed to the new service system. However, in the new service system, since the location registration operation for the mobile terminal MS4 is in progress, the second visitor location register VLR2 does not have a subscriber record for the mobile terminal MS4. Therefore, the second visitor location register VLR2
Transmits a routing request error message of the mobile terminal MS4 to the home location register HLR as a response to the routing request message (ST35). Then, upon receiving the error message, the home location register HLR initializes the location information of the subscriber with respect to the mobile terminal MS4 in the database (ST36), and then sends a location request to the mobile switching center MSC. The response message is transmitted (ST37).

At this time, an incoming signal request for the same mobile terminal MS4 is generated and the mobile terminal M
When transmitting the location request message of S4 to the home location register HLR (ST40), the home location register HLR
Has already initialized the location information for the mobile terminal MS4 in response to the routing request error message from the step (ST36), so that the home location register HLR stores the location information of the subscriber for the mobile terminal MS4. I do not have. Therefore, the call is not established by transmitting the response message of the location request of the mobile terminal MS4 having no routing information to the corresponding mobile switching center having the location request (ST41).

The mobile terminal MS4 is again connected to another service system (in the drawing, the first visitor location register V).
When moving to an area where LR1 is managed, the first area will be described.
The visitor location register VLR1 transmits a location registration request message of the mobile terminal MS4 to the home location register HLR (ST42).

However, since the location information of the subscriber with respect to the mobile terminal MS4 has already been initialized in the database of the home location register HLR, the location of the subscriber is registered in the second visitor location register VLR2 in the immediately preceding area. No delete request occurs. By transmitting a response message of the location registration request to the mobile terminal MS4 to the first visitor location register VLR1 (ST43), the first visitor location register VLR1 transmitted the response message of the location registration request.
Generates a subscriber record for the mobile terminal MS4 in its database.

Then, the same mobile terminal MS4 as described above
Moves again to a service area having a subscriber record (in the drawing, an example is described in which the user moves to a service area managed by the second visitor location register VLR2). Since the subscriber location register VLR2 already has a subscriber record for the mobile terminal MS4, it does not request location registration from the home location register HLR. Therefore, the home location register HLR
Maintains the wrong subscriber's location information with respect to the mobile terminal MS4, so that a disadvantage is likely to occur when a subscriber of another mobile communication network sends a call signal but does not make a call.

[0025] In such a case, the user of the mobile terminal must call the mobile communication business office to check it, and a method for solving such a problem is to visit the mobile communication business. Unnecessary subscriber records must be found and removed from the database of the location register. However, such a method is not a fundamental measure to prevent the problem before it occurs, but a fragmentary improvement to temporarily resolve the problem when it is found, so the same problem may continue to occur. is there.

[0026]

SUMMARY OF THE INVENTION Accordingly, the present invention has been devised to solve the above problems, and the present invention provides a mobile terminal provided with a previous service system. When moving from one area to an area where a new service system is provided, even if two visitor location registrants request duplicate location registration from the home location registrant to the home location registrar, the home location SUMMARY OF THE INVENTION It is a first object of the present invention to provide a method of managing location information of a subscriber in a mobile communication system in which information can be accurately maintained by a single visitor location register.

[0027] Further, according to the present invention, when a mobile terminal moves from an area where a previous service system is provided to an area where a new service system is provided, location registration and call processing procedures for the same subscriber are duplicated. In such a case, a second object of the present invention is to provide a method of managing location information of a subscriber in a mobile communication system, in which a home location register can always maintain a current location of a corresponding subscriber accurately.

[0028]

In the embodiment for achieving the first object, an arbitrary mobile terminal comprises:
Moving to an area where the new service system is provided, performing a location registration corresponding to the area of the mobile terminal on the home location register, and displaying that the location registration is being performed; Preventing location registration for the same subscriber until the previous location registration is deleted while the location registration is being performed.

The step of preventing the home location register from registering a plurality of locations includes the first step of performing location registration of the corresponding terminal while indicating to the home location register that the location registration is being performed. Requesting a first visitor location register, which is a visitor location register of the area where the previous service system of the mobile terminal is provided, to delete the location of the mobile terminal; A second step of waiting for a response to the message, and in the response waiting state of the second step, if there is a response message to the location deletion request from the first visitor location register, after the completion of location registration is displayed, And a third step of executing a process for the response message transmitted from the first visitor location register.

In the first stage, the status display of the home location register during the location registration may be performed by using a bit value of a location registration flag set in a database of the home location register.

In the third step, the completion of the location registration execution of the home location register may be indicated by using a bit value of a location registration flag set in a database of the home location register.

The first step includes: checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal requested to perform location registration; If the bit value indicates that the location registration is being performed, the most recently set location registration time of the mobile terminal is checked again, and as a result of the time check, the location registration time is determined in advance. If the set time has passed,
Determining that the location registration flag has been set incorrectly due to an error, changing the flag to a bit value in a state where the location registration has been completed, and then returning to a normal location registration procedure execution step. May be included.

[0033] The second step is a step of judging whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And, as a result of the judgment,
If there is a secondary location registration request, checking the bit value of the location registration flag, and if the result of the check indicates that the bit value of the location registration flag is set, the location registration is processed as an error. Steps may be further included.

In the third step, when a rejection message of a request to delete the location of the mobile terminal is returned from the first visitor location register, the mobile terminal stores the mobile terminal stored in the database of the home location register. The method may further include restoring a subscriber record to the first visitor location register.

The method of displaying the most recently set position registration time may be performed using a display value of the last position registration time formed in the database of the home position register.

In another embodiment for achieving the first object, an arbitrary mobile terminal moves to an area where a new service system is provided, so that the mobile terminal is registered in the home location register. Displaying the location registration being executed on the corresponding visitor location register while executing the location registration corresponding to the corresponding area, and when the previous location registration is deleted while the location registration is being executed. A method for managing location information of a subscriber in a mobile communication system, the method including a step of preventing registration of a plurality of locations for the same subscriber.

In the process of ignoring the plurality of location registration signals and the call processing signal of the home location register, the first step of performing location registration of the corresponding terminal and indicating that the location registration is being performed; A second step of requesting a visitor location register in a region where the previous service system of the mobile terminal is provided to delete the location of the mobile terminal, and waiting for a message response from the second location; and a response waiting state of the second step In the above, if there is a response message to the location deletion request from the first visitor location register, after the location registration execution completion is displayed, a process for the response message transmitted from the first visitor location register is executed. Three steps and the second
In the waiting state for the response to the position deletion request in the step, if there is a position request for the mobile terminal from any mobile switching center that has called the mobile terminal, a routing error for the position request occurs. May also include a fourth step in which the location information of the subscriber in the database is not initialized, but is maintained by the previous visitor location register.

In the first step, the status of the home location register while the location registration is being executed may be displayed using a bit value of a location registration flag set in a database of the home location register.

In the third step, the completion of the position registration execution of the home position register may be displayed by using a bit value of a position register flag set in a database of the home position register.

The first step includes checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal for which location registration has been requested; If the bit value indicates that the location registration is being performed, the most recently set location registration time of the mobile terminal is checked again, and as a result of the time check, the location registration time is determined in advance. If the set time has passed,
Determining that the location registration flag has been set incorrectly due to an error, changing the flag to a bit value in a state where the location registration has been completed, and then returning to a normal location registration procedure execution step. May be included.

The second step is a step of judging whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And, as a result of the judgment,
If there is a secondary location registration request, checking the bit value of the location registration flag, and if the result of the check indicates that the bit value of the location registration flag is set, the location registration is processed as an error. Steps may be further included.

In the third step, when the first visitor location register receives a response message rejecting a request to delete the location of the mobile terminal, the mobile terminal stored in the database of the home location register is returned. May be restored to the first visitor location register.

In the fourth step, there is a position request for the mobile terminal from any mobile switching center that has called the mobile terminal in a response waiting state for the position deletion request to the mobile terminal. Determining whether or not the mobile switching center requests a location of the mobile terminal from the second visitor's location register if the mobile switching center determines that the location has been requested. If there is an error, the location registration flag is checked, and if the location registration flag indicates that location registration is being executed, the subscriber record for the mobile terminal stored in the database is stored in the database. Maintaining the first visitor location register as it is.

[0044] The method of displaying the most recently set location registration time may be performed using a display value of the last location registration time formed in the database of the home location register.

In still another embodiment for achieving the second object, an arbitrary mobile terminal moves to an area where a new service system is provided, so that the mobile terminal moves to the home location register. A process of displaying that the location registration is being performed while performing location registration corresponding to the corresponding area of the terminal; and, while the location registration is being performed, the same subscriber until the previous location registration is deleted. A method for managing location information of a subscriber in a mobile communication system, comprising a step of ignoring a plurality of location registration signals and a call processing signal from an arbitrary exchange.

The step of preventing the home location register from registering a plurality of locations includes a first step of performing the location registration of the corresponding terminal while indicating to the home location register that the location registration is being performed. A second step of requesting a location register of a visitor in the area where the previous service system of the mobile terminal is provided to delete the location of the mobile terminal, and waiting for a message response from the request; and a response in the second step. In the standby state, if there is a response message to the location deletion request from the first visitor location register, the completion of the location registration is displayed, and then the process for the response message transmitted from the first visitor location register is executed. And a third stage.

In the first stage, the status display of the home location register during the location registration may be performed by using a bit value of a location registration flag set in a database of the home location register.

In the third step, the completion of the location registration execution of the home location register may be displayed by using a bit value of a location registration flag set in a database of the home location register.

The first step is to check a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal for which location registration has been requested, and as a result of the flag confirmation, If the bit value indicates that the location registration is being performed, the most recently set location registration time of the mobile terminal is checked again, and as a result of the time check, the location registration time is determined in advance. If the set time has passed,
Judging that the location registration flag is erroneously set due to an error, changing the flag to a bit value in a state where the location registration has been completed, and then returning to a normal location registration procedure execution step. You may go out.

The second step is a step of judging whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And, as a result of the judgment,
If there is a secondary location registration request, checking the bit value of the location registration flag, and if the result of the check indicates that the bit value of the location registration flag is set, the location registration is processed as an error. Steps may be further included.

In the third step, when the first visitor's location register responds to the mobile terminal's location deletion request rejection message, the mobile terminal stored in the home location register's database is responded to. The method may further include restoring a subscriber record to the first visitor location register.

[0052] The method of displaying the most recently set position registration time may be carried out by using a display value of the last position registration time formed in the database of the home position register.

In still another embodiment for achieving the second object, an arbitrary mobile terminal moves to an area where a new service system is provided, so that the mobile terminal moves to the home location register. A process of displaying that the location registration is being performed on the corresponding visitor location register while performing location registration corresponding to the corresponding region of the terminal; and, when the location registration is being performed, the previous location registration is deleted. A plurality of location registration signals for the same subscriber and a process of ignoring a call processing signal from an arbitrary exchange until a predetermined time.

In the process of ignoring the plurality of location registration signals and the call processing signal of the home location register, a first step of displaying that the location registration is being performed while performing location registration of the corresponding terminal; A second step of requesting the location register of the mobile terminal in the area where the previous service system of the mobile terminal is provided to delete the location of the mobile terminal, and waiting for a message response from the visitor location register; In the two-step response waiting state, if there is a response message to the location deletion request from the first visitor location register, a response message transmitted from the first visitor location register after displaying completion of location registration execution 3rd to execute processing for
And in the step of waiting for a response to the position deletion request in the second step, if there is a position request for the mobile terminal from any mobile switching center that has called the mobile terminal, The method may include a fourth step in which, even if a routing error occurs, the location information of the subscriber in the database is not initialized, but is maintained by the previous visitor location register.

In the first step, the status of the home location register while the location registration is being performed may be displayed using a bit value of a location registration flag set in a database of the home location register.

In the third step, the completion of the location registration execution of the home location register may be displayed by using a bit value of a location registration flag set in a database of the home location register.

The first step includes checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal for which location registration has been requested; If the bit value indicates that the location registration is being performed, the most recently set location registration time of the mobile terminal is checked again, and as a result of the time check, the location registration time is determined in advance. If the set time has passed,
Judging that the location registration flag is erroneously set due to an error, changing the flag to a bit value in a state where the location registration has been completed, and then returning to a normal location registration procedure execution step. You may go out.

[0058] The second step is a step of judging whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And, as a result of the judgment,
If there is a secondary location registration request, checking the bit value of the location registration flag, and if the result of the check indicates that the bit value of the location registration flag is set, the location registration is processed as an error. Steps may be further included.

In the third step, when the first visitor location register receives a rejection message of a request to delete the location of the mobile terminal, the mobile terminal stored in the database of the home location register is returned. May be restored to the first visitor location register.

In the fourth step, in a standby state for a response to the location deletion request to the mobile terminal, a location request for the mobile terminal is received from any mobile switching center that has called the mobile terminal. Determining whether or not the mobile switching center requests a location of the mobile terminal from the second visitor's location register if the mobile switching center determines that the location has been requested. If there is an error, the location registration flag is checked, and if the location registration flag indicates that location registration is being executed, the subscriber record for the mobile terminal stored in the database is stored in the database. (1) maintaining the visitor location register as it is.

[0061] The method of displaying the most recently set position registration time may be carried out using a display value of the last position registration time formed in the database of the home position register.

[0062]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart for explaining a method of managing location information of a subscriber in a mobile communication system according to an embodiment of the present invention, wherein an arbitrary mobile terminal MS5 is provided with a previous service system. 4 is a flowchart embodied to prevent location information of a mobile communication subscriber from being registered in two or more visitor location registers when moving from a location to a location where a new service system is provided. .

As shown in FIG. 1, an arbitrary mobile terminal M
If S5 moves from the area where the previous service system is provided to the area where the new service system is provided, the corresponding visitor location register (VLR2; hereinafter, referred to as a second visitor location register) in the new area is: , Mobile terminal MS
5 is detected and the mobile terminal MS is sent to the home location register HLR.
No. 5 primary location registration request message is transmitted (ST11)
I do. The home location register HLR updates the location of the mobile terminal MS5 in the database and stores the previous location. At this time, the previous visitor location register (VLR1; hereinafter, referred to as a first visitor location register) is a mobile terminal MS.
5 has a subscriber record. Therefore, the home location register HLR sets the location registration flag for the mobile terminal in its own database to "1" until the location registration is completed after receiving the primary location registration request message. Set (ST12). Then, the location delete request message of the mobile terminal MS5 is transmitted to the first visitor location register VLR1 (ST13). Here, the state in which the location registration flag is set to "1" indicates a state in which the home location register HLR is performing location registration of the mobile terminal MS5. Therefore, the home location register HLR performs error processing on all additional location registration requests that occur before the bit value of the location registration flag for the mobile terminal changes to "0".

It is assumed that the second visitor location register VLR
2 transmits a secondary location registration request message to the home location register HLR (ST14), the home location register HLR sets the bit value of the location registration flag for the mobile terminal in the database to “1”. Error processing of the secondary location registration request (ST1).
5) Do it.

Then, the second visitor location register VLR
An error response message of the secondary location registration request of the mobile terminal MS5 is sent to the mobile terminal MS2 (ST16). Accordingly, the subscriber record for the mobile terminal MS5 is not generated in the second visitor location register VLR2.

On the other hand, the mobile terminal MS requesting from the home location register HLR to the first visitor location register VLR1.
5 is not executed due to a busy state of the mobile terminal or the like, the first visitor location register VLR
1 sends a rejection message of the location deletion request of the mobile terminal MS5 to the home location register HLR (ST17). Therefore, the home location register HLR receives the rejection message of the location deletion request of the mobile terminal MS5, and changes the bit value of the location registration flag to “0”. The home location register HLR sends a rejection message of the primary location registration request of the mobile terminal MS5 to the second visitor location register VLR2 (S
T19). Therefore, the second visitor location register VLR2
Does not generate a subscriber record for the mobile terminal MS5.

Therefore, for the same mobile terminal, the second
Even if the visitor location register VLR2 requests location registration redundantly, the home location register HLR processes only a meaningful location registration request message, so that the home location register HLR and the first visitor location register are processed. The VLR1 and the second visitor location register VLR2 always maintain accurate location information for the mobile terminal.

FIG. 2 is an operation flowchart for preventing an error in the flag management of the home location register described above, if any.

As shown in FIG. 2, in a state where the location registration flag stored in the database of the home location register HLR is maintained at "1" due to an error (ST21), any mobile terminal MS6 is When moving from the area where the previous service system is provided to the area where the new service system is provided, the second visitor location register VLR is used.
2 senses the mobile terminal MS6 and transmits a primary location registration request message of the mobile terminal MS6 to the home location register HLR (ST22). At this time, the home location register HLR sets the location registration flag of the database to “1”.
The mobile terminal M is used to determine whether the location registration is actually being executed or whether the bit value is set due to an error.
The latest location registration time for S6 is compared with the current time. As a result of the comparison, if a certain period of time (in this embodiment, a case where the time is set to 6 seconds is described as an example) does not elapse, it is determined that the position registration is actually being executed, and the position registration flag is set. Error processing is performed for a location registration request that has occurred immediately before leaving it as it is. On the other hand, as a result of the comparison, if a predetermined time has elapsed, it is determined that there is an error in the flag management, and after resetting the location registration flag, the location registration request generated immediately before is normally accepted (ST23). ). Then, the home location register HLR updates the location of the mobile terminal MS6 in the database and stores its previous location. At this time, the first visitor location register VLR1 is connected to the mobile terminal MS6.
Has a subscriber record for. Therefore, the home location register HLR sets the bit value of the location registration flag formed in its own database to "1" until the location registration operation is completed (ST24). Then, the first visitor location register VLR1
To the mobile terminal MS6 to transmit a location deletion request message (ST25). Here, the location registration flag is set to “1”.
, All additional location registration request messages are processed in error before the value is changed to “0”.

However, if a secondary location registration request message is transmitted from the second visitor location register VLR2 to the home location register (ST26) for a special reason, the home location register HLR is formed in the database. Since the bit value of the location registration flag is set to "1", the second requested location registration message is subjected to error processing (ST27), and then the second visitor location register VLR is processed.
An error response message of the secondary location registration request of the mobile terminal MS6 is sent to the mobile terminal MS6 (ST28). Accordingly, a subscriber record for the mobile terminal MS6 is not generated in the second visitor location register VLR2.

On the other hand, when the location deletion request of the mobile terminal MS6 requested from the home location register HLR to the first visitor location register VLR1 is not executed due to the busy state of the mobile terminal, etc. The registrar VLR1 sends a rejection message of the location deletion request of the mobile terminal MS6 to the home location registrar HLR (ST29). Therefore,
When the home location register HLR receives the rejection message of the location deletion request of the mobile terminal MS6, the home location register HLR sets the bit value of the location registration flag to "0" to indicate that the location registration currently being performed has been completed. (ST30).
The home location register HLR sends a rejection message of the primary location registration request of the mobile terminal MS6 to the second visitor location register VLR2 (ST31). Therefore, no subscriber record for the mobile terminal MS6 is generated in the second visitor location register VLR2.

FIG. 3 shows an error that a subscriber of the same mobile communication network remains in two or more visitor location registers when the location registration procedure and the call processing procedure overlap for the same mobile communication subscriber. 10 is a flowchart according to another embodiment of the present invention for removing.

When any mobile terminal MS7 moves to the area where the new service system is provided, the second visitor location register VLR2 in the area where the new service system is provided senses the mobile terminal MS7. A request is issued to the home location register HLR for location registration (ST51). The home location register HLR updates the location of the mobile terminal MS7 in the database and stores the previous location. At this time, the first visitor location register VLR1 is connected to the mobile terminal MS.
7 has a subscriber record. Therefore, the home location register HLR sets the bit value of the location registration flag formed in its own database to "1" until the location registration is completed (ST5).
2) Then, the fact that the location registration is being executed is displayed, and a location deletion request message of the mobile terminal MS7 is transmitted to the first visitor location register VLR1 (ST53).

At this time, before the requested location registration is completed normally, a location request message for the same mobile terminal MS7 is sent to any mobile switching center MS not requesting location registration.
If the home location register HLR is transmitted from the C to the home location register HLR (ST54), the subscriber location information stored in the database of the home location register HLR has already been changed to a new service system. Is a routing request to a new service system.
uest) message to send routing information TLDN (ST55).

However, since the location registration requested by the new service system is currently in progress, the second visitor location register VLR2 does not have a subscriber record for the corresponding mobile terminal MS7. Therefore, as a response to the routing request message, a routing request error message (a message indicating that the subscriber is unknown) of the mobile terminal MS7 is sent to the home location register HL.
Transmit to R (ST56).

Even if the home location register HLR receives the error message corresponding to the routing request, the bit value of the current location registration flag is “1”.
The location information of the mobile terminal MS7 is not initialized (S
T57). Thereafter, a response message to the location request is transmitted to the mobile switching center MSC (ST58).
The call is not made. The first visitor location register VLR
When a response message to the location deletion request is transmitted from 1 to the home location register HLR (ST59), the home location register HLR receiving the message transmits the bit value of the location registration flag formed in its own database. By changing it to “0”, it indicates that the location registration has been completed, and sends a response message to the location registration request together with the subscriber information to the second visitor location register VL.
By transmitting the information to R2, the subscriber information of the mobile terminal MS7 is generated in the second visitor location register VLR2 (ST6).
0).

At this time, an incoming signal request is issued to the same mobile terminal MS7, and as shown in the lower part of FIG. When a message is transmitted to the home location register HLR (ST61), the home location register HL
R has the location information for the mobile terminal MS7 since the home location register HLR did not initialize the location information for the mobile terminal MS7 in the database in the step (ST57). Therefore, if the home location register HLR transmits a routing request message to the second visitor location register VLR2 in order to know the location information of the mobile terminal MS7 (ST62), the second visitor location register VLR2 will The response message of the routing request of the mobile terminal MS7 is transmitted to the home location register HLR (ST
63). The home location register HLR, having received the routing request response message, transmits the location request response message of the mobile terminal MS7 to any mobile switching center that has requested the location (ST64).

Also, the case where the mobile terminal MS7 moves to the area where the previous service system is provided (or another service system; in the embodiment of the present invention, the case where the mobile terminal MS7 moves again to the previous service system) will be described as an example. Then, the first visitor location register VLR1 transmits a location registration request message of the mobile terminal MS7 to the home location register HLR (ST65). Home location register HL
Since R has not initialized the subscriber location information stored in the database, it transmits a location deletion request message of the mobile terminal MS7 to the second visitor location register VLR2 (ST).
66) Then, the second visitor location register VLR2, which has received the location deletion request message, deletes the subscriber record for the mobile terminal MS7 stored in its own database and sends a response message of the location deletion request thereto to the home. It is transmitted to the location register HLR (ST67). Therefore, the home location register HLR receiving the response message of the location deletion request transmits the response message of the location registration request of the mobile terminal MS7 to the first visitor location register VLR1 (ST68). Accordingly, the first visitor location register VLR1 generates a subscriber record for the mobile terminal MS7.

Therefore, the current location information of the mobile terminal MS7 can be accurately maintained only by the home location register HLR and one visitor location register (VLR1 or VLR2).

FIG. 4 is a flow chart showing that when the location registration and the call processing procedure shown in FIG. 3 are duplicated and the error prevention is activated, the flag management is prevented from malfunctioning. .

An unknown error causes the home location register HL
R with the location registration flag maintained at "1" (ST
In 71), any mobile switching center MSC sends a location request message of the mobile terminal MS8 to the home location register H.
If the home location register HLR transmits the routing request message of the mobile terminal MS8 to the second visitor location register VLR2 (ST73). However, since the second visitor location register VLR2 does not have a subscriber record for the mobile terminal MS8, the second visitor location register VLR2 sends an error message of a routing request to the mobile terminal MS8. The information is transmitted to the home location register HLR (ST74). Therefore, the home location register HLR compares the current time with the latest location registration time of the mobile terminal MS8 because the bit value of the location registration flag formed in its own database is "1". It is determined whether the latest location registration time has passed a predetermined time of 6 seconds. After a predetermined time, the home location register HLR initializes the subscriber location information stored in its own database (ST).
75), and transmits the location request response message of the mobile terminal MS8 to the mobile switching center MSC (ST76).

At this time, another mobile switching center (not shown)
Transmits the location request message of the mobile terminal MS8 to the home location register HLR (ST77), the home location register HLR sends the routing information of the mobile terminal MS8 to the mobile switching center that sent the location request message. A response message of the location request notifying that there is no
78).

If the mobile terminal MS8 has previously moved to the service system area, the first visitor location register VLR1 in the corresponding area transmits a location registration request message of the mobile terminal MS8 (ST79). Then, the home location register HLR stores the subscriber location information for the mobile terminal MS8 in a database, and sends a location registration request response message to the first visitor without a location deletion request to another visitor location register. Transmit to location register VLR1 (ST
80), the first visitor location register VLR1
Then, a subscriber record for the mobile terminal MS8 is generated.

FIG. 5 shows that the location registration flag is set on the visitor location register, and the location registration flag set / reset in the home location register of each of the above-described embodiments and the error prevention operation using the same are performed by the visitor location register. FIG. 5 is a flowchart illustrating a method of managing location information of a subscriber programmed to be performed mainly on a mobile device. In FIG. 5, when a location registration of a mobile communication subscriber MS9 is performed, a home location register HLR and a previous visitor location are registered. This shows that accurate location information is maintained between the registration device VLR1 and the current visitor location registration device VLR2, and the following operations are held by the embodiments shown in FIGS. Needless to say.

Referring to FIG. 5, when an arbitrary mobile terminal MS9 moves from an area where a previous service system is provided to an area where a new service system is provided, a corresponding visitor location register VLR2 may be configured as follows. Mobile terminal MS
9 (ST91), the location registration flag is set to "1" (ST92), and the home location register HLR is set.
To the mobile terminal MS9 to transmit a location registration request message (ST93). At this time, the previous visitor location register VL
While R1 has a subscriber record for the mobile terminal MS9, the home location register HLR updates the location of the mobile terminal MS9 in a database and stores its previous location.

The home location register HLR recognizes that the location of the mobile terminal MS9 has been changed, and sends the requested location deletion request message to the previous visitor location register V.
Send it to LR1 (ST94) and wait for a response to it.
In the response waiting state, if there is a location request from any mobile switching center MSC to the mobile terminal MS9 (S
T95), the home location register HLR transmits a routing request message to the visitor location register VLR2 (ST9).
6) Yes.

However, at this time, the visitor location register V
Since LR2 has not received a response to the location registration,
Subscriber record does not exist in database. Therefore, the subscriber who requested the routing is not registered, and the location registration flag set by the user is set to “1”.

Therefore, the visitor location register VLR
In response to the routing request from the mobile terminal MS9, the home location register HLR transmits a message "error in operating procedure problem" instead of a message "error of unknown subscriber" (ST97). Therefore, the home location register HLR does not initialize the subscriber information, but transmits a response message to the location request to the mobile switching center MSC (ST98), so that the home location register HLR maintains accurate subscriber information. it can.

Thereafter, the home location register HLR is connected to the mobile terminal MS9 from the previous visitor location register VLR1.
Receiving a response message of a position deletion request to
T99), a response message of the location registration corresponding thereto is transmitted to the visitor location register VLR2 (ST100),
The visitor location register VLR2 is connected to the mobile terminal MS9.
After generating a subscriber record for in the database,
By changing the location registration flag to "0" (ST101), it is displayed that the location registration has been completed, and further location registration and call processing can be performed normally.

[0091]

As described above, according to the present invention, when a mobile communication subscriber moves from an area where a previous service system is provided to an area where a new service system is provided, one mobile terminal can be used. Even if the location registration is duplicated and requested by one visitor location register (or each request is made by two visitor location registers), the home location register can keep only the accurate location information of the subscriber. .

Further, when the location registration and the call processing procedure for the same subscriber overlap, the home location register can always maintain the current location of the subscriber accurately, and the temporary information for the same subscriber can be maintained. Can be maintained by only one visitor location register, which has the effect of increasing the reliability of call connection in the mobile communication system.

[Brief description of the drawings]

FIG. 1 is a flowchart of an embodiment of the present invention for removing an error shown in FIG.

FIG. 2 is a flowchart illustrating a process of preventing a malfunction that may occur again in the embodiment of FIG. 1;

FIG. 3 is a flowchart of another embodiment of the present invention for removing the error shown in FIG.

FIG. 4 is a flowchart illustrating a process of preventing a malfunction that may occur again in the embodiment of FIG. 3;

FIG. 5 is a flowchart illustrating a process of maintaining accurate location information between a home location register and a visitor location register during a location registration operation of a mobile communication subscriber according to another embodiment of the present invention; is there.

FIG. 6 is a flowchart showing a location registration procedure of a subscriber of normal mobile communication.

FIG. 7 is a flowchart showing a call processing procedure of a normal mobile communication subscriber.

FIG. 8 is a flowchart illustrating an error in which location information of a mobile communication subscriber is duplicated and registered in two or more visitor location registers.

FIG. 9 is a flowchart for explaining an error that may occur when the location registration and the call processing procedure shown in FIGS. 6 and 7 are repeatedly executed for the same mobile communication subscriber.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission Date] June 28, 1999 (1999.6.2
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (34)

[Claims] 1. An arbitrary mobile terminal moves to an area where a new service system is provided, so that location registration is performed while a home location register performs location registration corresponding to the area of the mobile terminal. Indicating that the location registration is being performed, and, while the location registration is being performed, preventing a plurality of location registrations for the same subscriber until the previous location registration is deleted. Location information management method. 2. The method according to claim 1, wherein the step of preventing the home location register from registering a plurality of locations includes performing a location registration of the corresponding terminal on the home location register while indicating that the location registration is being performed. Requesting the first visitor location register, which is a visitor location register of the area where the previous service system of the mobile terminal is provided, to delete the location of the mobile terminal, and registering the first visitor location A second stage of waiting for a message response from the device, and in the response waiting state of the second stage, if there is a response message to the location deletion request from the first visitor location register, the execution completion of location registration is displayed. And performing a process on a response message transmitted from the first visitor location register. 3. The method as claimed in claim 1, further comprising: Location information management method. 3. The method of claim 1, wherein in the first step, the status of the home location register during location registration is displayed using a bit value of a location registration flag set in a database of the home location register. 3. The method for managing location information of a subscriber in a mobile communication system according to claim 2, wherein: 4. The method of claim 3, wherein in the third step, the completion of position registration execution of the home location register is displayed using a bit value of a location registration flag set in a database of the home location register. Claim 2
3. A method for managing location information of a subscriber in a mobile communication system according to claim 1. 5. The method of claim 1, wherein the first step comprises: checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal requested to perform location registration; As a result, if the bit value indicates that the location registration is being performed, a step of re-checking the most recently set location registration time of the mobile terminal; and, as a result of the time check, the location registration time. If a predetermined period of time has elapsed, it is determined that the location registration flag has been set incorrectly due to an error, and the flag is changed to a bit value in a state where execution of the location registration has been completed. 3. The method of claim 2, further comprising: returning to a step of performing a location registration procedure. 6. The second step determines whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And if the result of the determination is that there is a secondary location registration request, checking the bit value of the location registration flag;
3. The location information management of a mobile communication system according to claim 2, further comprising the step of performing error processing on the location registration if it is confirmed that the bit value of the location registration flag is set. Method. 7. The mobile terminal stored in a database of the home location register when the first visitor location register receives a rejection message of a location deletion request of the mobile terminal. The method of claim 2, further comprising restoring a subscriber record for the mobile device to the first visitor location register. 8. The method of displaying the most recently set location registration time is performed using a display value of a last location registration time formed in a database of the home location register. 6. A method for managing location information of a subscriber in the mobile communication system according to item 5. 9. When a mobile terminal moves to an area where a new service system is provided, the home location register performs location registration while performing location registration corresponding to the area of the mobile terminal. And, during the location registration, ignoring a plurality of location registration signals for the same subscriber and a call processing signal from any exchange until the previous location registration is deleted. A location information management method for a subscriber in a mobile communication system including: 10. The method of ignoring a plurality of location registration signals and a call processing signal of the home location registration device includes a first step of performing location registration of the corresponding terminal and indicating that the location registration is being performed. A second step of requesting a location register of a visitor in an area where a previous service system of the mobile terminal is provided to delete the location of the mobile terminal, and waiting for a message response from the request; and a response of the second step In the standby state, if there is a response message to the position deletion request from the first visitor location register, after the location registration execution completion is displayed, the process for the response message transmitted from the first visitor location register is executed. In a third stage, and in a standby state of a response to the position deletion request in the second stage,
If there is a location request for the mobile terminal from any mobile switching center where a call was issued to the mobile terminal,
10. The method as claimed in claim 9, further comprising: maintaining a previous visitor location register without initializing location information of a subscriber in a database even if a routing error occurs in response to the location request. A location information management method for a subscriber in the mobile communication system according to the above aspect. 11. The method according to claim 1, wherein in the first step, the status of the home location register during location registration is displayed using a bit value of a location registration flag set in a database of the home location register. Claim 1.
0. A method for managing location information of a subscriber in the mobile communication system according to 0. 12. The method of claim 3, wherein in the third step, the status of the completion of location registration of the home location register is displayed using a bit value of a location register flag set in a database of the home location register. The method for managing location information of a subscriber in a mobile communication system according to claim 10. 13. The method of claim 1, wherein the first step comprises: checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal for which location registration has been requested; As a result, if the bit value indicates that the location registration is being performed, a step of re-checking the most recently set location registration time of the mobile terminal; and, as a result of the time check, the location registration time. If a predetermined period of time has elapsed, it is determined that the location registration flag has been set incorrectly due to an error, and the flag is changed to a bit value in a state where execution of the location registration has been completed. 11. The method according to claim 10, further comprising: returning to a step of performing a location registration procedure. . 14. The second step determines whether there is a secondary location registration request for the same mobile terminal from the second visitor location register while waiting for a response to the location deletion request to the mobile terminal. And if the result of the determination is that there is a secondary location registration request, checking the bit value of the location registration flag;
11. The location information management of a mobile communication system according to claim 10, further comprising the step of performing error processing on the location registration if it is confirmed that the bit value of the location registration flag is set. Method. 15. The mobile communication device according to claim 3, wherein the third visitor location registerer responds to the mobile terminal with a rejection message of a location deletion request of the mobile terminal, the mobile location stored in the home location registerer database. The method according to claim 10, further comprising restoring a subscriber record for a terminal to the first visitor location register. 16. The fourth step comprises: in a standby state for a response to a location deletion request to the mobile terminal, a location request to the mobile terminal from any mobile switching center that has been called for the mobile terminal. Determining whether there is a request, and if the result of the determination is that there is a location request from the mobile switching center, requesting the second visitor location register to route the corresponding mobile terminal. If the result is an error, checking the location registration flag; and, if the location registration flag indicates that location registration is being performed, a subscriber record for the mobile terminal stored in a database. In the mobile communication system according to claim 10, further comprising the step of maintaining the first visitor location register as it is. Location information management method. 17. The method of displaying the most recently set location registration time is performed using a display value of a last location registration time formed in a database of the home location register. 14. A method for managing location information of a subscriber in the mobile communication system according to item 13. 18. A mobile terminal moves to an area where a new service system is provided, so that a home location register performs location registration corresponding to the area of the mobile terminal and a corresponding visitor location. Indicating that the location registration is being performed on the registration device; and, while the location registration is being performed, preventing a plurality of location registrations for the same subscriber until the previous location registration is deleted. A method for managing location information of a subscriber in a mobile communication system. 19. The method according to claim 19, wherein the step of preventing the home location register from performing a plurality of location registrations includes performing a location registration of the corresponding terminal on the home location register while indicating that the location registration is being performed. A second step of requesting a visitor location register of the area where the previous service system of the mobile terminal is provided to delete the location of the mobile terminal and waiting for a message response therefrom; the second step In the response waiting state, if there is a response message to the location deletion request from the first visitor location register, processing of response to the response message transmitted from the first visitor location register is performed after displaying completion of location registration execution. 19. The method according to claim 18, further comprising: performing a third step. 20. In the first step, the status display of the home location register during location registration is performed using a bit value of a location registration flag set in a database of the home location register. Claim 1.
10. The method for managing location information of a subscriber in the mobile communication system according to item 9. 21. In the third step, the completion of the location registration execution of the home location register is displayed by using a bit value of a location registration flag set in a database of the home location register. 20. The method according to claim 19, wherein the location information is managed by a subscriber. 22. The first step comprises: checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal requested to perform location registration; As a result, if the bit value indicates that the location registration is being performed, a step of re-checking the most recently set location registration time of the mobile terminal; and, as a result of the time check, the location registration time. If a predetermined period of time has elapsed, it is determined that the location registration flag has been set incorrectly due to an error, and the flag is changed to a bit value in a state where execution of the location registration has been completed. 20. The method of claim 19, further comprising returning to a step of executing a location registration procedure. 23. The method of claim 23, further comprising: determining whether there is a secondary location registration request for the same mobile terminal from the second visitor location register in a standby state in response to a location deletion request for the mobile terminal. And if the result of the determination is that there is a secondary location registration request, checking the bit value of the location registration flag;
20. The location information management of a mobile communication system according to claim 19, further comprising: if it is confirmed that the bit value of the location registration flag is set, error processing the location registration. Method. 24. The mobile terminal stored in the database of the home location register when the first visitor location register receives a rejection message of a request to delete the location of the mobile terminal. 20. The method of claim 19, further comprising restoring a subscriber record for the mobile device to the first visitor location register. 25. The method of displaying the most recently set location registration time is performed using a display value of a last location registration time formed in a database of the home location register. 23. A method for managing location information of a subscriber in the mobile communication system according to item 22. 26. Registering a visitor's location while performing location registration corresponding to the area of the mobile terminal on a home location register by moving an arbitrary mobile terminal to an area where a new service system is provided. A step of indicating that location registration is being executed on the mobile station; and, while the location registration is being executed, a plurality of location registration signals for the same subscriber and calls from any exchange until the previous location registration is deleted. And neglecting the processed signal. 27. The process of ignoring the plurality of location registration signals and the call processing signal of the home location registration device includes the first step of performing location registration of the corresponding terminal and indicating that the location registration is being performed. A second step of requesting a location register of the mobile terminal in a region where the previous service system of the mobile terminal is provided to delete the location of the mobile terminal, and waiting for a message response from the visitor location register; In the response waiting state of the second step, if there is a response message to the location deletion request from the first visitor location register, the completion of location registration is displayed and then transmitted from the first visitor location register. A third step of executing a process for the response message; and a standby state for a response to the position deletion request in the second step.
If there is a location request for the mobile terminal from any mobile switching center where a call was issued to the mobile terminal,
27. The method as claimed in claim 26, further comprising: maintaining a previous visitor location register without initializing the location information of the subscriber in the database even if a routing error for the location request occurs. A location information management method for a subscriber in the mobile communication system according to the above aspect. 28. In the first step, the status display of the home location register during the location registration is performed using a bit value of a location registration flag set in a database of the home location register. Claim 2
8. A method for managing location information of a subscriber in the mobile communication system according to item 7. 29. In the third step, the completion of the location registration execution of the home location register is displayed by using a bit value of a location register flag set in a database of the home location register. The method for managing location information of a subscriber in a mobile communication system according to claim 27. 30. The first step comprises: checking a bit value of a location registration flag for the mobile terminal before performing a location registration procedure of the mobile terminal requested to perform location registration; As a result, if the bit value indicates that the location registration is being performed, a step of re-checking the most recently set location registration time of the mobile terminal; and, as a result of the time check, the location registration time. If a predetermined period of time has elapsed, it is determined that the location registration flag has been set incorrectly due to an error, and the flag is changed to a bit value in a state where the execution of the location registration has been completed. 28. The method of claim 27, further comprising: returning to a step of performing a location registration procedure. 31. In the second step, in a standby state for a response to a location deletion request to the mobile terminal, it is determined whether there is a secondary location registration request for the same mobile terminal from the second visitor location register. And if the result of the determination is that there is a secondary location registration request, checking the bit value of the location registration flag;
28. The location information management of a mobile communication system according to claim 27, further comprising: if it is confirmed that the bit value of the location registration flag is set, error processing the location registration. Method. 32. In the third step, when the first visitor location register receives a rejection message of a location deletion request of the mobile terminal, the mobile location stored in the database of the home location register is returned. The method according to claim 27, further comprising restoring a subscriber record for a terminal to the first visitor location register. 33. The fourth step, wherein, in a standby state for a response to a location deletion request to the mobile terminal, a location request for the mobile terminal from any mobile switching center that has generated a call to the mobile terminal. Determining whether there is a request, and if the result of the determination is that there is a location request from the mobile switching center, requesting the second visitor location register to route the corresponding mobile terminal. If the result is an error, checking the location registration flag; and, if the location registration flag indicates that location registration is being performed, a subscriber record for the mobile terminal stored in a database. In the mobile communication system according to claim 27, further comprising the step of causing the first visitor location register to keep the same as it is. Information management method. 34. The display method of the most recently set location registration time is performed using a display value of the last location registration time formed in the database of the home location register. 30. A method for managing location information of a subscriber in the mobile communication system according to item 30.