KR100855699B1 - Method for Routing Cancel Location Message for Inbound Roaming Subscribers and Gateway Location Register for the Same - Google Patents

Abstract

The present invention proposes a method of routing a location deregistration request message for an inbound roaming subscriber in a gateway location register of a visiting network.

In the method of routing a location registration cancellation request message routing of an inbound roaming subscriber of the present invention, the second visitor is located as the inbound roaming subscriber registered with the location of the first visitor location register requests a location registration with a second visitor location register. If a location update request message including address information and subscriber identification information of the second visitor location register is received from the location register, querying the subscriber database to query the address information of the first visitor location register; Searching for a signal point code corresponding to the address of the first visitor location register by referring to a signal point code database that maps address information of a plurality of visitor location registers with signal point code information of the visitor location register; Steps; A fourth step of routing the location registration cancel request message to the first visitor location register having the corresponding signal point code, so that the first visitor location register deletes the information of the inbound roaming subscriber; ; There are technical features to include.

WCDMA, GLR, Location Registration

Description

Method for Routing Cancel Location Message for Inbound Roaming Subscribers and Gateway Location Register for the Same}

1 is a configuration diagram of a mobile communication network for explaining location registration of a conventional inbound roaming subscriber;

2 is a flowchart illustrating a location registration process of a conventional inbound roaming subscriber;

3 is a conceptual diagram illustrating the operation of the gateway location register of the present invention;

4 is a block diagram of a gateway location register according to an embodiment of the present invention;

5 is a flowchart sequentially illustrating a method for routing location registration cancellation request message of an inbound roaming subscriber according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: first visitor location register (OLD MSC (or SGSN))

120: second visitor location register (NEW MSC (or SGSN))

200: gateway location register

210: location update processing unit

211: subscriber database

220: location registration cancellation processing unit

221: signal point code database

The present invention relates to a method for routing location registration cancellation request message of an inbound roaming subscriber and a gateway location register for the same, and more specifically, by mapping address information of a domestic exchange or SGSN (serving GPS service node) with signal point code information. As the inbound roaming subscriber moves in the domestic network, when a location update request message is received from a new exchange or SGSN, the signal point code information is found at an address of the previous exchange or SGSN, and a location cancellation request message is sent to the previous exchange or SGSN. The present invention relates to a method for routing a location registration cancellation request message of an inbound roaming subscriber and a gateway location register for the inbound roaming subscriber, which can transmit and thereby solve a bad reception of an inbound roaming subscriber due to incorrect location registration information.

In the mobile communication system, the visitor location register (VLR) and the home location register of the exchange where the subscriber information governs the area where the subscriber is located so that the mobile subscriber can use normal outgoing / incoming and supplementary services in the area where the subscriber is currently located. This is called location registration.

On the other hand, in such a mobile communication system, if the mobile communication terminal performs location registration in the area under the control of the first exchange, and then moves to the area under the control of the second exchange, the visitor location register of the second exchange exchanges the terminal. While performing location registration, the home location register which manages the entire subscriber information is also notified of the location movement so that the subscriber is registered in the home location register as being located in the jurisdiction of the second exchange.

However, when the mobile communication terminal having moved to the area of the second exchange moves to the first exchange side within a short time, since the information of the mobile communication terminal is already registered in the visitor location register of the first exchange, The visitor location register of the exchange does not notify the movement of the location to the home location register, and thus, when the home location register does not know the exact location of the subscriber and a call connection request to the mobile communication terminal occurs, it is routed to the second exchange. There is a problem that a loss of the call connection request message occurs.

Therefore, in order to solve this problem, the current home location register is configured to request the cancellation of the registration of the location to the visitor location register of the previously registered exchange when the location registration is made with the visitor location register of the new exchange as the terminal moves. Accordingly, since the existing location registration information (subscriber information) is deleted from the visitor location register of the previous exchange, accurate location management is possible and there is no loss of the call connection request message.

Meanwhile, as WCDMA / HSDPA, a third generation mobile communication system, is commercialized in dozens of urban areas nationwide, the inbound roaming performance used by domestic WCDMA subscribers is growing rapidly. This is because in the second generation (G) environment where asynchronous mobile communication (GSM) has been the mainstream, outbound roaming used by Koreans during overseas travel is the largest part of the total roaming performance. As inbound roaming is growing rapidly, it is expected to be the first step in expanding the roman market.

The network configuration of the third generation asynchronous mobile communication system (WCDMA) is shown in FIG.

As shown, the asynchronous mobile communication system includes a base station (Node-B, 11, 21), a base station controller (RNCD, 12, 22), a switch exchange / visitor location register that performs circuit exchange and manages the location information of the visiting subscriber ( MSC / VLR, 13, 23), including a Serving GPS Service Node (SGSN) 14, 24 and a Gateway Location Register (GLR) 30, which perform packet exchange and manage location information of visiting subscribers. It is composed.

The gateway location register 30 is a system that serves as a gateway to enable roaming services between mobile operators using different Mobile Application Part (MAP) protocols (GSM, ANSI-41, PDC, WCDMA, etc.). It has a virtual HLR function for the network (the inbound subscriber's visited network) and a virtual VLR function for the home network (the inbound subscriber's home network).

Looking at the location registration process of the inbound roaming subscriber using the gateway location register 30 through FIG. 2, the mobile communication terminal 10 is located in the area A and is located from the MSC-A 13 or SGSN-A 14. When the update is requested (S1), the gateway location register 30 requests the subscriber information to the home location register 40 of the overseas network, which is the home network (S2), and when the subscriber information response is received (S3), the MSC-A (13). ) Or by sending a response message to the location update request to the SGSN-A 14 (S4), the MSC-A 13 or the SGSN-A 14 stores the subscriber information normally (S5) to perform location registration. To lose.

Subsequently, when the mobile communication terminal 10 moves to region B, the MSC-B 23 or SGSN-B 24, which is a visitor location register of the region B, requests a location update to the gateway location register 30 again. (S6), the gateway location register 30 performs a subscriber information request / response (S7, S8) with the home location register 40 and then sends a location update request to the MSC-B 23 or SGSN-B 24. In response to the response (S9), the MSC-B (23) or SGSN-B (24) will have the subscriber information of the mobile communication terminal 10 (S10).

However, as described above, when the mobile communication terminal 10 of the inbound roaming subscriber moves from the A region to the B region, the existing gateway location register 30 performs location registration to the B region to update the location, but the A region. Unregister location for cannot be performed.

This is performed by Global Title Translation (GTT), which is a procedure of determining an incoming signal point and a subsystem number (SSN) through signaling (global title, etc.) in STP (Signal Transfer Point), which is a signal relay point between a domestic network and a foreign network. Due to routing signaling messages through Global Title Translation, inbound roaming subscribers are required to raise an address from the SGSN or the exchange to the gateway location register 30 in the specification.

That is, the gateway location register 30 needs to know the signaling point code information to route the location cancellation request message to the previous SGSN or the exchange, but currently has only an address, so it can route the location cancellation request message. It can't be done.

Eventually, as the inbound roaming subscriber in the current structure moves from Region A to Region B, SGSN-A 14 or MSC-A 13 in Region A and SGSN-B 24 or MSC-B in Region B (23) stores the information of the same subscriber in duplicate, and although the SGSN-A (14) or the MSC-A (13) in the region A retains the subscriber information for a predetermined time and deletes it, the subscriber information is not stored. If the inbound roaming subscriber moved back to Region A while it was being held in duplicate, the gateway location register (the SGSN-A 14 or MSC-A 13 in Region A is storing that subscriber's information). 30) does not post the location update request message, which is a cause of bad reception for inbound roaming subscribers.

In particular, as mentioned above, in view of the rapid growth of inbound roaming performance, it is very urgent to improve poor reception for inbound roaming subscribers by improving the location registration (cancellation) procedure of the gateway location register 30. .

Accordingly, the present invention is to solve the above disadvantages and problems of the prior art, the gateway location register (GLR) to maintain a table mapping the signal point code information and address information, the inbound roaming subscriber is moved If a location registration is required, the location registration of the inbound roaming subscriber to convert the location registration cancellation request message to cancel the previous location registration by converting the address of the previously registered SGSN or exchange into signal point code information to the previous SGSN or exchange. It is an object of the present invention to provide a cancellation request message routing method and a gateway location register for the same.

In addition, the present invention has another object to enable the gateway location register to cancel the previous location registration of the inbound roaming subscriber, thereby improving the poor incoming to the inbound roaming subscriber due to the dual location registration of the subscriber. .

The object of the present invention is a method for routing a location registration cancellation request message for an inbound roaming subscriber in a gateway location register of a visited network, and as the mobile communication terminal of the inbound roaming subscriber requests location registration with a first visitor location register, If a location update request message including address information of the first visitor location register and corresponding subscriber identification information is received from the first visitor location register, the corresponding address obtained from the home location register of the home network is obtained. Storing the inbound roaming subscriber information in a subscriber database and transmitting a location update response message including the inbound roaming subscriber information to the first visitor location register; Location update including address information and subscriber identification information of the second visitor location register from the second visitor location register as the mobile communication terminal of the inbound roaming subscriber moves in position and requests location registration with a second visitor location register. Receiving a request message, querying the subscriber database to query address information of the first visitor location register; Corresponding to the address of the first visitor location register by referring to a signal point code database that stores address information on a plurality of visitor location registers with signal point code information for routing a message to the visitor location register. Inquiring a signal point code to be used; A fourth step of routing the location registration cancel request message to the first visitor location register having the corresponding signal point code, so that the first visitor location register deletes the information of the inbound roaming subscriber; ; The location registration cancellation request message routing method of the inbound roaming subscriber comprising a.

In addition, the object of the present invention is a visitor gateway location register operating as a virtual visitor location register for a home network home location register of an inbound roaming subscriber, the information of the inbound roaming subscriber received from the home network home location register and the subscriber A subscriber database for storing address information of the visitor location register currently registered; A signal point code database for mapping address information for the plurality of visitor location registers with signal point code information for routing messages to the visitor location registers; As the mobile terminal of the inbound roaming subscriber requests location registration with a specific visitor location register, when a location update request message including address information and subscriber identification information of the visitor location register is received, the home network home location of the inbound roaming subscriber Receive the subscriber information from the registrar and store it in the subscriber database along with the address information of the visitor location registrant which transmitted the location update request message, and the address information of the visitor location registrant previously registered for the inbound roaming subscriber is stored in the subscriber database. A location update processor for outputting the information along with the information of the inbound roaming subscriber, if present; According to the information output from the location update processor, the signal point code corresponding to the address of the visitor location register previously registered with reference to the signal point code database is inquired, and according to the inquired signal point code, the corresponding signal point code A location registration cancellation processing unit for routing the location registration cancellation request message to the visitor location register having the previous location registration visitor location register to delete the information of the inbound roaming subscriber; It is achieved by a gateway location register comprising a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, FIG. 3 is a conceptual diagram for describing an operation of a gateway location register of the present invention, and FIG. 4 is a configuration diagram of a gateway location register according to an embodiment of the present invention.

As shown in FIG. 3, the gateway location register 200 of the present invention is a previous location exchange or SGSN (when the previously registered inbound roaming subscriber moves the location and requests location registration to a new exchange or SGSN 120). Location registration cancellation request message.

In the case of a WCDMA mobile communication system, not only the switch having a visitor location register therein, but also the Serving SIP Service Node (SGSN) stores the visitor's information for packet call exchange, and the WCDMA terminal stores the switch and serving SIP. The location will be registered with both S service nodes.

Accordingly, the subject that transmits the location update request message to the gateway location register 200 may be an exchange or a serving GPS service node, but the operation process after the gateway location register 200 receives the location update request message is the same. Therefore, for convenience of description, hereinafter, the exchange or serving GPS service node will be described as a visitor location register.

As illustrated in FIG. 4, the gateway location register 200 includes a location update processing unit 210 and a location registration cancellation processing unit 220. Each of the gateway location registers 200 obtains and stores subscriber information from a home location register of a home network that is an overseas network. It is connected to the signal point code database 221 which maps and stores the address and signal point codes of the subscriber database 211 and the visitor location register (exchange or SGSN).

The location update processing unit 210 receives and processes a location update request message including address information and subscriber identification information of the visitor location register as the mobile communication terminal of the inbound roaming subscriber requests the location registration to a specific visitor location register. Specifically, it is as follows.

First, when the location update request message is received, the location update processing unit 210 requests the subscriber information of the inbound roaming subscriber to the home network home location register of the inbound roaming subscriber for information management and location management of the corresponding inbound roaming subscriber. Is received and stored in the subscriber database 211.

At this time, the location update processing unit 210 stores the address information of the visitor location register that has transmitted the location update request message in the subscriber database 211 so that the information of the previous visitor location register may be changed when the subscriber moves later. Allow to delete.

To this end, if the address information of the previous visitor location register is stored in the subscriber database 211, the location update processing unit 210 stores the address information of the visitor location register and the inbound subscriber information (identification information). Together with the location registration cancellation processing unit 220.

The location registration cancellation processing unit 220 maps the address information for the plurality of visitor location registers with the signal point code information for routing the message to the corresponding visitor location registers according to the information output from the location update processing unit 210. The signal point code corresponding to the address of the previously registered visitor location register by referring to the signal point code database 221 stored therein, and according to the inquired signal point code, the visitor location register having the corresponding signal point code Route the location registration cancellation request message to the previous location registered visitor location register to delete the information of the inbound roaming subscriber.

That is, in the present invention, when the location registration cancellation processing unit 220 receives the address information of the visitor location register which needs to delete the subscriber information from the location update processing unit 210, it signals the address with reference to the signal point code database 221. After converting to the point code, the location registration cancellation request message is transmitted using the signal point code.

Meanwhile, the gateway location register 200 of the present invention may simultaneously perform an update to a new location and cancel the previous location registration, or cancel the previous location registration first and then update the new location when the cancellation is completed. I can finish it.

In the former case, the location update processing unit 210 may update the subscriber database 211 and transfer the address of the previous visitor location register to the location registration cancellation processing unit 220 individually or simultaneously. In the latter case, when the location registration cancellation processing unit 220 receives a response message to the location registration cancellation request message from the previous location registration visitor location register, and transmits the location registration cancellation information to the location update processing unit 210, Accordingly, the location update processor 210 transmits the location update response to the visitor location register requesting the location update, so that the new location registration can be completed only when the previous location registration is cancelled.

As described above, the gateway location register 200 of the present invention includes a signal point code database 221 for mapping and storing signal point codes with addresses, thereby canceling location registration with the address of the visitor location register to cancel location registration. You can successfully route the request message to the previous visitor location register.

Next, FIG. 5 is a flowchart sequentially illustrating a method of routing a location registration cancellation request message of an inbound roaming subscriber according to an embodiment of the present invention, and shows the overall location of the operation of the gateway location register of the present invention described with reference to FIGS. 3 and 4. Included in the registration process will be described.

As shown, when a mobile communication terminal of an inbound roaming subscriber requests a location registration with an OLD MSC (or SGSN) (hereinafter referred to as a first visitor location register), the first visitor location register is received from the mobile communication terminal. Recognizing that the corresponding subscriber is an inbound roaming subscriber using the subscriber identification information included in the registered location registration request message, the location update request message is transmitted to the gateway location register (S501). At this time, the first visitor location register transmits its own address information in the location update request message according to the standard.

Upon receiving the location update request message, the gateway location register requests information of a corresponding subscriber to a home location register of a home network of an overseas network (S503), and responds by replying to subscriber information after authentication of the corresponding subscriber from a home location register (S505). In the visiting network, the gateway location register stores information of the inbound roaming subscriber in order to operate as a virtual home location register, and maintains location registration information by storing information of the first visitor location register requesting the location update (S507). ).

Next, the gateway location register responds to the location update request by returning a location update response message including subscriber information to the first visitor location register (S509).

Meanwhile, since the gateway location register receiving the location update request message performs a process of transmitting a response message to the location update request without releasing a transaction, a procedure such as separately inquiring a signal point code is not necessary. Will not.

The first visitor location register receiving the location update response message temporarily stores the subscriber information of the corresponding inbound roaming subscriber (S511) to complete the location registration.

However, when the terminal of the corresponding inbound roaming subscriber who performs the location registration process as described above requests a location registration to a NEW MSC (or SGSN) (hereinafter referred to as a second visitor location register), The visitor location register again transmits a location update request message to the gateway location register (S513).

At this time, the gateway location register that has received the location update request message requests subscriber information to the home location register (S515), thereby receiving subscriber information (S517), and has already received subscriber information from the home location register. In this case, steps S515 and S517 may be omitted.

On the other hand, the gateway location register that stores the information of the inbound roaming subscriber inquires the location registration information of the subscriber to query the address of the first visitor location register previously registered by the inbound roaming subscriber, the gateway of the present invention The signal point code mapped to the address is checked with reference to the information of the signal point code database included in the location register (S519). Accordingly, the first visitor location register is found and the location registration cancellation request message is routed (S521).

The first visitor location register to which the location registration cancellation request message is routed performs a process of deleting the information of the corresponding inbound roaming subscriber stored in step S511 (S523), and when the deletion is completed, sends the location registration cancellation response message to the gateway location register. It is preferable to transmit (S525) so that the gateway location register can perform the cancellation confirmation process.

The gateway location register receiving the location registration cancellation response message stores the address of the second visitor location register to update the location registration information of the subscriber (S527), and when the information update, that is, location update, is completed, the second visitor location register. By sending a response message (including subscriber information) in response to the location update request (S529), the second visitor location register allows the information of the inbound subscriber to be stored (S531).

Meanwhile, in the embodiment of FIG. 5, the location update is performed after the previous location registration is canceled, but the location update process and the location registration cancelation process may be performed simultaneously or separately.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Therefore, according to the method for routing the location registration cancellation request message of the inbound roaming subscriber of the present invention and the gateway location register therefor, the gateway location register (GLR) maintains a table in which signal point code information and address information are mapped, thereby inbound roaming subscriber. When the mobile station requests the location registration, the location registration cancellation request message for canceling the previous location registration by converting the address of the previously registered SGSN or exchange into signal point code information can be routed to the previous SGSN or exchange.

In addition, according to the present invention, the gateway location register can easily cancel the previous location registration while satisfying the existing specification that the routing is performed with the address. There is an effect that can improve the poor reception.

In addition, according to the present invention, since the inbound roaming subscriber can cancel the previous location registration immediately after registering the location with the new SGSN or the exchange, the existing SGSN or the exchange does not have to maintain unnecessary subscriber information for a predetermined time, and the location registration information is deleted. There is an advantage that there is no need to run a timer separately for this, it is possible to operate the SGSN or exchange more efficiently.

Claims (10)

A method for routing location cancellation request messages for inbound roaming subscribers in a gateway location register of a visiting network, comprising: As a mobile communication terminal of an inbound roaming subscriber requests location registration with a first visitor location register, a location update request message including address information of the first visitor location register and corresponding subscriber identification information is received from the first visitor location register. When the address information of the first visitor location register is stored in the subscriber database along with the information of the inbound roaming subscriber obtained from the home location register of the home network, the first visitor location register includes information of the inbound roaming subscriber. Transmitting a location update response message; Location update including address information and subscriber identification information of the second visitor location register from the second visitor location register as the mobile communication terminal of the inbound roaming subscriber moves in position and requests location registration with a second visitor location register. Receiving a request message, querying the subscriber database to query address information of the first visitor location register; Corresponding to the address of the first visitor location register by referring to a signal point code database that stores address information on a plurality of visitor location registers with signal point code information for routing a message to the visitor location register. Inquiring a signal point code to be used; A fourth step of routing the location registration cancel request message to the first visitor location register having the corresponding signal point code, so that the first visitor location register deletes the information of the inbound roaming subscriber; ; Including Wherein the visitor location register is any one of a visitor location register of an exchange and a serving SGSN node (SGSN). A method for routing location cancellation request messages for inbound roaming subscribers in a gateway location register of a visiting network, comprising: As a mobile communication terminal of an inbound roaming subscriber requests location registration with a first visitor location register, a location update request message including address information of the first visitor location register and corresponding subscriber identification information is received from the first visitor location register. When the address information of the first visitor location register is stored in the subscriber database along with the information of the inbound roaming subscriber obtained from the home location register of the home network, the first visitor location register includes information of the inbound roaming subscriber. Transmitting a location update response message; Location update including address information and subscriber identification information of the second visitor location register from the second visitor location register as the mobile communication terminal of the inbound roaming subscriber moves in position and requests location registration with a second visitor location register. Receiving a request message, querying the subscriber database to query address information of the first visitor location register; Corresponding to the address of the first visitor location register by referring to a signal point code database that stores address information on a plurality of visitor location registers with signal point code information for routing a message to the visitor location register. Inquiring a signal point code to be used; A fourth step of routing the location registration cancel request message to the first visitor location register having the corresponding signal point code, so that the first visitor location register deletes the information of the inbound roaming subscriber; ; Including After the fourth step, A fifth step of storing address information of the second visitor location register together with information of the corresponding inbound roaming subscriber in a subscriber database and transmitting a location update response message including information of the inbound roaming subscriber to the second visitor location register; ; The location registration cancellation request message routing method of the inbound roaming subscriber further comprises. The method of claim 2, The fifth step, And receiving a response message for the location registration cancellation request message from the first visitor location register. A method for routing location cancellation request messages for inbound roaming subscribers in a gateway location register of a visiting network, comprising: As a mobile communication terminal of an inbound roaming subscriber requests location registration with a first visitor location register, a location update request message including address information of the first visitor location register and corresponding subscriber identification information is received from the first visitor location register. When the address information of the first visitor location register is stored in the subscriber database along with the information of the inbound roaming subscriber obtained from the home location register of the home network, the first visitor location register includes information of the inbound roaming subscriber. Transmitting a location update response message; Location update including address information and subscriber identification information of the second visitor location register from the second visitor location register as the mobile communication terminal of the inbound roaming subscriber moves in position and requests location registration with a second visitor location register. Receiving a request message, querying the subscriber database to query address information of the first visitor location register; Corresponding to the address of the first visitor location register by referring to a signal point code database that stores address information on a plurality of visitor location registers with signal point code information for routing a message to the visitor location register. Inquiring a signal point code to be used; A fourth step of routing the location registration cancel request message to the first visitor location register having the corresponding signal point code, so that the first visitor location register deletes the information of the inbound roaming subscriber; ; Including The second step, Wherein the gateway location register stores the address information of the second visitor location register together with the information of the corresponding inbound roaming subscriber in a subscriber database, and inquires the address information of the previously stored first visitor location register. A method of routing a subscriber's location registration request message. The method of claim 4, wherein After the fourth step, And when the gateway location register receives a response message for the location registration cancellation request message from the first visitor location register, transmitting a location update response message including information of the inbound roaming subscriber to the second visitor location register. Step 5; The location registration cancellation request message routing method of the inbound roaming subscriber further comprises. The method according to any one of claims 2 to 5, Wherein the visitor location register is any one of a visitor location register of an exchange and a serving SGSN node (SGSN). A visited network gateway location register operating as a virtual visitor location register for an inbound roaming subscriber's home network home location register, A subscriber database for storing the information of the inbound roaming subscriber received from the home network home location register and the address information of the visitor location register to which the subscriber is currently registered; A signal point code database for mapping address information for the plurality of visitor location registers with signal point code information for routing messages to the visitor location registers; As the mobile terminal of the inbound roaming subscriber requests location registration with a specific visitor location register, when a location update request message including address information and subscriber identification information of the visitor location register is received, the home network home location of the inbound roaming subscriber Receive the subscriber information from the registrar and store it in the subscriber database along with the address information of the visitor location registrant which transmitted the location update request message, and the address information of the visitor location registrant previously registered for the inbound roaming subscriber is stored in the subscriber database. A location update processor for outputting the information along with the information of the inbound roaming subscriber, if present; According to the information output from the location update processor, the signal point code corresponding to the address of the visitor location register previously registered with reference to the signal point code database is inquired, and according to the inquired signal point code, the corresponding signal point code A location registration cancellation processing unit for routing the location registration cancellation request message to the visitor location register having the previous location registration visitor location register to delete the information of the inbound roaming subscriber; Including Wherein the visitor location register is any one of a visitor location register of an exchange and a serving GPS service node (SGSN). A visited network gateway location register operating as a virtual visitor location register for an inbound roaming subscriber's home network home location register, A subscriber database for storing the information of the inbound roaming subscriber received from the home network home location register and the address information of the visitor location register to which the subscriber is currently registered; A signal point code database for mapping address information for the plurality of visitor location registers with signal point code information for routing messages to the visitor location registers; As the mobile terminal of the inbound roaming subscriber requests location registration with a specific visitor location register, when a location update request message including address information and subscriber identification information of the visitor location register is received, the home network home location of the inbound roaming subscriber Receive the subscriber information from the registrar and store it in the subscriber database along with the address information of the visitor location registrant which transmitted the location update request message, and the address information of the visitor location registrant previously registered for the inbound roaming subscriber is stored in the subscriber database. A location update processor for outputting the information along with the information of the inbound roaming subscriber, if present; According to the information output from the location update processor, the signal point code corresponding to the address of the visitor location register previously registered with reference to the signal point code database is inquired, and according to the inquired signal point code, the corresponding signal point code A location registration cancellation processing unit for routing the location registration cancellation request message to the visitor location register having the previous location registration visitor location register to delete the information of the inbound roaming subscriber; Including The location registration cancellation processing unit, Routing location registration cancellation request message to the previously registered visitor location registrar and transferring location registration cancellation information to the location update processor; The location update processing unit, And when the location registration cancellation information is received from the location registration cancellation processing unit, transmitting a location update response message to the visitor location register that has transmitted the location update request message. The method of claim 8, The location registration cancellation processing unit, And when the response message for the location registration cancel request message is received from the previously registered visitor location register, transfer the location registration cancellation information to the location update processing unit. The method according to any one of claims 8 to 9, Wherein the visitor location register is any one of a visitor location register of an exchange and a serving GPS service node (SGSN).

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