KR100366490B1 - A returning method within a gsm service area inr a roaming service system between gsm system and cdma system - Google Patents

Abstract

PURPOSE: A method for returning a position to a GSM(Global System for Mobile communications) service area in a roaming service system between a GSM system and a CDMA(Code Division Multiple Access) service system is provided to minimize the change of a conventional network and perform a roaming service by a GSM SIM(Subscriber Identity Module) card by performing a position registration with the GSM system using a CDMA data burst message. CONSTITUTION: If a subscriber who returns in a home GSM service area requests a position update to an HLR(Home Location Register)(220) through an MSC(Mobile Switching Center)(230) of a GSM system(S400), the corresponding HLR(220) requests a position deletion of the corresponding subscriber to an IRGS(International Roaming Gateway System)(300) which performs a VLR(Visitor Location Register) function of the GSM system(S410). The IRGS(300) receives the position deletion request from the HLR(220) and requests the position deletion to a VLR(130) of a CDMA system(S420). The VLR(130) of the CDMA system deletes the position of the corresponding subscriber according to the request of the IRGS(300), and transmits a deletion completion response to the IRGS(300)(S430). The IRGS(300) receives the position deletion completion response from the VLR(130) of the CDMA system, transmits the position deletion completion response to the HLR(220) of the GSM system, and releases a TMIN corresponding to an IMSI(International Mobile Subscriber Identity)(S440). The HLR(220) receives the position deletion completion response from the IRGS(300), and transmits the position deletion completion response to a GSM terminal(250) through the MSC(230) and a BSS(Base Station System)(240) of the GSM system for informing the completion of the position update registration by the return from the CDMA service area of the GSM subscriber(S450).

Description

How to relocate roaming service system between GMS system and CDM service system to GSM service area {A RETURNING METHOD WITHIN A GSM SERVICE AREA INR A ROAMING SERVICE SYSTEM BETWEEN GSM SYSTEM AND CDMA SYSTEM}

The present invention relates to a method for returning to a GSM service area in a roaming service system between a GSM system and a CD service system.

Recently, with the rapid increase in the demand for mobile communication, the demand for global roaming that can be called with a single number anywhere in the world is increasing.

If a current GSM service subscriber enters Korea and wants to receive CDMA service, he or she should rent a new terminal from an immigration airport lounge or a mobile communication agency and use a new subscriber number instead of his own number.

In particular, in the GSM (Global System for Mobile communications) method, a SIM card containing its subscriber profile is mounted on a terminal and used. In the mobile communication using the SIM card, any country that provides a GSM type service can borrow a terminal accommodating the SIM and attach its SIM card to the terminal to use its own number. However, in Korea, which provides a CDMA type of service different from the GSM type, there is a problem that GSM subscribers cannot use their own numbers using their SIM cards.

On the other hand, recently, countries using the CDMA scheme are trying to take advantage of the SIM card by adopting a UIM card similar to the SIM card. Accordingly, a CDMA terminal that accommodates a UIM card is also being developed. Although the SIM card is the same in size as the UIM card, although it can be mechanically mounted in the CDMA terminal, the mobile communication service can be provided using the CDMA terminal equipped with the SIM card due to the difference between the CDMA service method and the GSM service method. There is no number.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a GSM service subscriber that can use a service that enables roaming while using a CDMA network by mounting a GSM SIM card in a CDMA terminal. To provide a roaming service system in the CDMA service area.

It is also an object of the present invention to provide a method for relocation to a GSM service area in a roaming service system.

1 is a diagram illustrating a schematic network structure for a roaming service using a SIM card in a CDMA service area according to an embodiment of the present invention.

2 is a flowchart of a method for registering a location of a roaming subscriber using a SIM card in a CDMA service area according to a first embodiment of the present invention.

3 is a diagram illustrating a location registration method of a roaming subscriber of FIG. 2 using the roaming service system of FIG. 1.

4 is a diagram illustrating a method for registering a location of a roaming subscriber using a SIM card in a CDMA service area according to a second embodiment of the present invention using the roaming service system of FIG.

FIG. 5 is a diagram illustrating a location registration method using a roaming service system of FIG. 1 when a location of a roaming subscriber using a SIM card is changed in a CDMA service area according to a third embodiment of the present invention. FIG. FIG. 5B is a diagram illustrating a case where TMIN is used.

6 is a diagram illustrating a location registration method when a roaming subscriber using a SIM card in a CDMA service area returns to a home GSM service area according to a fourth embodiment of the present invention using the roaming service system of FIG. .

FIG. 7 is a view illustrating a process of a roaming subscriber using a SIM card in a CDMA service area transmitting to a GSM subscriber in a home GSM service area using the roaming service system of FIG. 1 according to a fifth embodiment of the present invention. .

FIG. 8 is a view illustrating a process of a roaming subscriber using a SIM card transmitting to another roaming subscriber in a CDMA service area according to a sixth embodiment of the present invention using the roaming service system of FIG.

FIG. 9 is a diagram illustrating a roaming subscriber using a SIM card in a CDMA service area according to a seventh embodiment of the present invention using a roaming service system of FIG. 1.

FIG. 10 is a view illustrating a process in which a roaming subscriber using a SIM card in a CDMA service area sends a short message to a subscriber in a home GSM service area using the roaming service system of FIG. 1 according to an eighth embodiment of the present invention. to be.

FIG. 11 illustrates a process in which a roaming subscriber using a SIM card in a CDMA service area receives a short message from a subscriber in a home GSM service area using the roaming service system of FIG. 1 according to a ninth embodiment of the present invention. to be.

In order to achieve the above object, a method for registering a location when a GSM service subscriber roams a CDMA service according to an aspect of the present invention

A CDMA system connected to a GSM system and an international roaming gateway system connected between the CDMA system and the GSM system to perform signal conversion between the systems, and perform signal conversion between the CDMA system and the GSM system. In a roaming service system performing a roaming service, a method of registering a location when a GSM service subscriber roaming in the CDMA service returns to the GSM service area after using the CDMA service,

(a) a terminal of a roaming subscriber returning from a CDMA service area to a GSM service area requesting a location update from the HLR of the GSM system through an MSC of the GSM system;

(b) the HLR of the GSM system requesting an international roaming gateway system that has performed a VLR function for a terminal of the roaming subscriber in a CDMA service area to delete the subscriber's location; And

(c) the international roaming gateway system requesting the VLR of the CDMA system to delete a location for the roaming subscriber station;

It includes.

In this case, the international roaming gateway system may store a specified MIN (TMIN) corresponding to the IMSI stored in the SIM card, wherein step (b) further includes deleting the TMIN stored in the international roaming gateway system. The step (c) may further include the international roaming gateway system requesting the VLR of the CDMA system to delete the TMIN corresponding to the IMSI.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a schematic network structure for a roaming service using a SIM card in a CDMA service area according to an embodiment of the present invention.

As shown in FIG. 1, a roaming service system according to an embodiment of the present invention is an international roaming gateway that connects a CDMA system 100, a GSM system 200, and a CMDA system 100 and a GSM system 200. System 300 (International Roaming Gateway System (IRGS)).

The CDMA system 100 is connected to the CDMA network 110 and is connected to the HLR 120 storing the subscriber's location information and service information, the CDMA network 110, and the MSC 130 and the MSC in charge of the call connection function. A base station system (BSS) 140 connected to the 130 and serving as an interface function between the wired network and the wireless section, and a CDMA terminal 150 wirelessly connected to the BSS 140 and capable of mounting a SIM card.

In the CDMA system 100, a plurality of HLRs and MSCs are provided and interworked with each other to perform subscriber management and call exchange functions. Several MSCs may be connected to one HLR, and a plurality of BSSs may be connected to one MSC. In addition to the above components, it may include an authentication center for performing the authentication function of the terminal, a VLR mainly located inside the MSC 130 and storing the visitor's information.

On the other hand, the configuration of the GSM system 200 is similar to the configuration of the CDMA system 100, and is connected to the GSM network 210, HLR 220, GSM network 210 for storing the location information and service information of the subscriber, etc. MSC 230 that is connected to the call connection function, GSM network 210 and is connected to the authentication center (Authentication Center, hereinafter referred to as AuC) 260, MSC 230 that is responsible for the authentication function of the terminal And a BSS 240 in charge of an interface function between the wired network and the wireless section, and a GSM terminal 250 wirelessly connected to the BSS 240.

Like the CDMA system 100, the GSM system 200 may have a plurality of HLRs, MSCs, and BSSs. In addition, the GSM system 200 may include a plurality of components.

The IRGS 300 is connected between the CDMA network 110 and the GSM network 210 and performs signal conversion so that signal exchange between the two networks 110 and 210 can be performed.

The IRGS 300 manages the profile of the GSM SIM subscriber by serving as the function of the HLR in the position of the CDMA system 100, and serves the function of the VLR in the position of the GSM system 200, so that the GSM system 200 roams. The location of the SIM subscriber is recognized by the IRGS 300.

The CDMA terminal 150 accommodating the GSM SIM requires a separate additional function to transmit and receive data required by the GSM system 200 with the BSS 140.

This additional function includes a function of using a CDMA data burst message to pass data required for authentication of a user to the GSM system 200 when registering a roaming subscriber. Using this CDMA databurst channel can minimize roaming subscribers while minimizing changes in current networks.

Message transmission over the CDMA databurst channel is currently used as a short message transmission. The CDMA databurst message can use any CDMA radio channel, and any channel can transmit and receive data without changing the network.

Hereinafter, according to an embodiment of the present invention, an operation in which a GSM subscriber attaches and uses his SIM card to a CDMA terminal in a CDMA service area will be described.

First, a description will be given of a process in which a GSM subscriber moves to a CDMA service area and attempts to register a location after mounting a SIM card in the CDMA terminal 150.

The location registration process can be implemented in two ways.

First, the CDMA system 100 accepts IMSI (International Mobile Subscriber Identity), which is a number system used in the GSM system 200.

The current numbering system in Korea is MIN (Mobile Identity Number). In order to accommodate the GSM SIM, it is possible to accept the IMSI number system in the CDMA system 100. Accordingly, location registration is possible in the GSM system 200 using the CDMA data burst message under the assumption that the CDMA system 100 accepts the IMSI.

The second is an implementation method in which the CSI system 100 does not accept the IMSI number system and uses MIN as it is.

In this case, since the IMSI cannot be used as it is, the reserved MIN (hereinafter referred to as TMIN) available in the CDMA system 100 is allocated to the IMSI, and the call is connected after registering using the TMIN.

Hereinafter, a first embodiment of attempting location registration according to the first method will be described with reference to FIGS. 2 and 3.

First, when the GSM SIM subscriber roams in the CDMA system 100 to mount the SIM card in the CDMA terminal 150, the terminal requests location registration for the subscriber (S100). That is, when the SIM card is mounted on the CDMA terminal 150, the CDMA terminal 150 recognizes that the SIM card is mounted, reads the necessary information including the IMSI from the subscriber profile stored in the SIM card, and transmits it to the BSS 140. The BSS 140 requests location registration by passing the information to the MSC 130.

Next, the MSC 130 receiving the location registration request from the CDMA terminal 150 requests the IRGS 300 to register the location (S102). That is, the MSC 130 receives the information including the IMSI transmitted from the CDMA terminal 150 through the BSS 140 and transmits the information back to the IRGS 300 so that the location registration request from the CDMA terminal 150 is IRGS. To 300. At this time, the MSC 130 recognizes that the subscriber's HLR is the IRGS 300 through the IMSI received from the CDMA terminal 150.

Thereafter, the IRGS 300 that receives the location registration request recognizes that the subscriber requesting the location registration is a GSM service subscriber, and thus needs subscriber authentication for the GSM system 200, and then the HLR of the GSM system 200. Request authentication parameters 220 (S104). That is, the IRGS 300 requests an authentication parameter from the HLR 220 with the IMSI received from the MSC 130.

Meanwhile, the HLR 220 of the GSM system 200 receiving the authentication parameter request from the IRGS 300 transmits the authentication parameter obtained from the AuC 260 to the IRGS 300 for the corresponding subscriber (S106). That is, the HLR 220 of the GSM system 200 transmits an authenticator obtained from the AuC 260, that is, an SRES and a random number that is an initial value of the authentication algorithm, that is, RAND, to the IRGS 300.

The IRGS 300 that receives the authentication parameter from the HLR 220 of the GSM system 200 transmits the authentication parameter RAND to the CDMA terminal 150 through the CDMA data burst message (S108). As such, by using the CDMA data burst message to transmit the RAND, it is possible to minimize the change of the CDMA system 100.

At this time, the CDMA terminal 150 transmits a response indicating that the RAND has been received to the IRGS 300 using the CDMA data burst message, so that the IRGS 300 receives the RAND transmitted from the CDMA terminal 150. It can be confirmed that (S112).

Next, the CDMA terminal 150 transmits the received RAND to the SIM card mounted in the CDMA terminal 150, and the SIM card executes the same authentication algorithm as the AuC 260 of the GSM system 200 with the received RAND. When the calculated SRES is calculated (S114) and transmitted to the CDMA terminal 150, the CDMA terminal 150 transmits the transferred SRES to the IRGS 300 using the CDMA data burst message (S116).

The IRGS 300 receiving the SRES from the CDMA terminal 150 transmits the SRES reception response to the CDMA terminal 150 by using the CDMA data burst message, so that the SRES transmitted by the CDMA terminal 150 finally receives the IRGS 300. So that it can be seen that (S120).

Meanwhile, the IRGS 300 receiving the SRES calculated by the transmitted RAND compares the SRES received from the HLR 220 of the GSM system 200 with the received SRES calculated by the SIM card (S122). If the two values do not match, the user is not a legitimate user, and thus the CDMA terminal 150 is notified of the location registration failure, and the location registration process is terminated.

If the two values match (S124), the IRGS 300 determines that the subscriber who requested the location registration is a legitimate subscriber and requests the location registration to the HLR 220 of the GSM system 200 (S126).

Next, the HLR 220 of the GSM system 200 receiving the location registration request from the IRGS 300 transmits a profile for the corresponding subscriber to the IRGS 300 (S128). That is, the HLR 220 of the GSM system 200 recognizes the IRGS 300 as the VLR of the GSM system 200, stores the current roaming subscriber's position as the IRGS 300, and provides a service to the roaming subscriber. Transmits the current subscriber profile to IRGS 300.

Meanwhile, the IRGS 300 responds to the reception of the subscriber profile transmitted from the HLR 220 of the GSM system 200 and stores the corresponding profile (S130). At this time, when the IRGS 300 transmits a response to the subscriber profile reception to the HLR 220 of the GSM system 200, the HLR 220 receives the response to the subscriber profile transmission, and then receives a location registration completion response. IRGS 300 transmits (S132), IRGS 300 transmits a location registration complete response back to MSC 130 of CDMA system 100 (S134), and MSC 130 again transmits CDMA terminal 150. By transmitting a location registration complete response (S136), roaming subscriber location registration in the CDMA service area of the GSM service subscriber is completed.

At this time, the HLR 220 of the GSM system 200 should delete the location where the roaming subscriber was registered before roaming to the CDMA service area (S140). That is, the HLR 220 of the GSM system 200 requests the VLR in the MSC 230 of the GSM system 200 to delete the location of the subscriber that was registered before roaming to the CDMA coverage area, and the GSM system 200 The VLR in the MSC 230 deletes the previous location of the subscriber (S140).

Next, a second embodiment of attempting location registration according to the second method will be described with reference to FIG. 4.

Since the process of attempting location registration according to the second embodiment is similar to the process of attempting location registration according to the first embodiment described above, only different parts will be described.

In this case, since the CDMA system 100 does not accept the IMSI numbering system stored in the SIM card, IMSI cannot be used. Therefore, when the GSM roaming subscriber mounts the SIM card in the CDMA terminal 150, the CDMA terminal 150 is connected to the SIM. The necessary information including the IMSI is read from the card and transmitted to the MSC 130 through the BSS 140 of the CDMA system 100 (S10).

The MSC 130 of the CDMA system 100 transmits information including the IMSI received from the CDMA terminal 150 to the IRGS 300 (S20), and the IRGS 300 sends a response to the reception of the information. The MSC 130 of 100 transmits (S30), and the MSC 130 also transmits the corresponding information reception response to the CDMA terminal 150 (S40).

Next, the IRGS 300 allocates a TMIN corresponding to the information including the received IMSI and transmits the TMIN to the CDMA terminal 150 using the CDMA data burst message (S50). At this time, the TMIN corresponding to the received IMSI is stored in the IRGS 300, and when the TMIN is received in the subsequent process, the communication attempt is made with the GSM system 200 using the IMSI stored corresponding to the corresponding TMIN.

Meanwhile, the CDMA terminal 150 receiving the TMIN from the IRGS 300 transmits the TMIN reception response to the IRGS 300 using the CDMA data burst message and then stores the corresponding TMIN (S70). Thereafter, the CDMA terminal 150 receives a roaming service using a TMIN granted from the IRGS 300.

The location registration process performed hereafter is similar to the procedure of the first embodiment, and IMSI is used in the first embodiment only in the process of transmitting from the CDMA terminal 150 to the IRGS 300, but in the second embodiment, IRGS The only difference is that the TMIN granted from 300 is used.

This will be described in more detail as follows.

First, the CDMA terminal 150 transmits a location registration request for a GSM service subscriber to the MSC 130 of the CDMA system 100 (S200). That is, the CDMA terminal 150 transmits the TMIN stored therein for the location registration request to the MSC 130 through the BSS 140 of the CDMA system 100.

Next, the MSC 130 of the CDMA system 100 that receives the location registration request from the CDMA terminal 150 requests the IRGS 300 to register the location (S202). That is, the MSC 130 of the CDMA system 100 receives the TMIN transmitted from the CDMA terminal 150 through the BSS 140 and transmits the TMIN back to the IRGS 300 to request the location registration from the CDMA terminal 150. To be transmitted to the IRGS 300.

Thereafter, the IRGS 300 that receives the location registration request recognizes that the subscriber requesting the location registration is a GSM service subscriber, and thus needs subscriber authentication for the GSM system 200, and then the HLR of the GSM system 200. Request authentication parameters 220 (S204). That is, the IRGS 300 requests an authentication parameter from the HLR 220 with the IMSI corresponding to the TMIN received from the MSC 130 of the CDMA system 100.

After this, the steps S106, S108, S110, S112, and S114 performed in the first embodiment are similarly performed in the second embodiment (S206, S208, S210, S212, and S214).

Thereafter, steps S116, S118, and S120 performed in the first embodiment are performed in the same manner except that TMIN is used instead of IMSI (S216, 218, and 220).

Thereafter, the steps S122, S124, S126, S128, S130, S132, S134, S136, S138, S140, and S140 'performed in the first embodiment are also performed in the second embodiment (S222, S224, S226, S228, S230, S232, S234, S236, S238, S240, S240 '), roaming subscriber location registration in the CDMA service area of the GSM service subscriber is completed.

Next, with reference to FIGS. 5A and 5B, a third embodiment in which a GSM subscriber tries to register a location when a location is changed in a CDMA service area will be described.

After the GSM subscriber finishes initial location registration as described in the first and second embodiments, the location change processing is performed in the same manner as the home subscriber of the CDMA system 100. At this time, the location change and location registration management IRGS 300 is the HLR function of the CDMA system 100. In addition, from the position of the GSM system 200, even if the roaming subscriber changes its location in the CDMA system 100, the subscriber's location always becomes the IRGS 300.

On the other hand, when using the same method as in the first embodiment, IMSI is used as it is, and when using the same method as in the second embodiment, TMIN is used instead of IMSI.

First, when a roaming subscriber requests location registration due to a change of location to the MSC 130 of the CDMA system 100 through the BSS 140 (S300), the MSC 130 authenticates a roaming subscriber requesting location registration. Do this. This authentication process is performed when the IMSI is used, the same process as the location registration process (S102 ~ S136) described in the first embodiment with reference to Figures 2 and 3, and when using the TMIN Figure 4 Since the same process as the location registration process (S20 to S236) described in the second embodiment with reference to is carried out, detailed description thereof will be omitted here.

That is, if IMSI is used, starting from step S102 of requesting location registration by the MSC 130 of the CDMA system 100 and completing location registration, transmitting a response to the CDMA terminal 150 (S136). In step S20, when the TMIN is used, the MSC 130 of the CDMA system 100 transmits information including the IMSI received from the CDMA terminal 150 to the IRGS 300 (S20). Although the process up to step S236 of completing the location registration and transmitting the response to the CDMA terminal 150 is performed as the authentication process in this embodiment, this authentication process may not be included according to the system design, but is preferable. It is better to proceed to the next step after such authentication process. Therefore, this authentication process is shown in detail in FIG. 5A when IMSI is used and in FIG. 5B when TMIN is used.

After the above authentication process is completed, the MSC 130 of the CDMA system 100 transmits the IMSI or TMIN of the CDMA terminal 150 requesting location registration to the IRGS 300 to request the location update registration (S310). ).

The IRGS 300, which has received the location update registration request from the MSC 130, stores the location before the location change of the roaming subscriber in the CDMA system 100 before the MSC 130 'of the location change CDMA system 100 is stored. Request the deletion of the location of the VLR (S320), and before changing the location, the VLR within the MSC 130 'deletes the corresponding location and transmits a deletion completion response to the IRGS 300 (S330), and the IRGS (300). The corresponding location deletion completion response is transmitted to the CDMA terminal 150 through the MSC 130 and the BSS 140 of the CDMA system 100 to inform that the location update registration is completed due to the location change of the roaming subscriber (S340, S350).

At this time, since the home GSM system 200 recognizes the roaming subscriber's location as the IRGS 300, the HLR 220 of the GSM system 200 is irrelevant.

Next, referring to FIG. 6, a fourth embodiment in which a GSM subscriber attempts location registration when returning to a home GSM service area after using a roaming service in a CDMA service area will be described.

If the GSM subscriber leaves the CDMA coverage area and goes back to the home GSM coverage area, the location of the roaming subscriber must be updated back to the location within the GSM coverage area, so that the location of the IRGS 300 serving as the HLR of the CDMA system 100 is The HLR 220 of the GSM system 200 is deleted and its location is updated. In this case, the location registration process conventionally performed in the GSM system 200 is performed as it is, and the IRGS 300 converts the location deletion message of the GSM system 200 into the location deletion message of the CDMA system 100 to perform the above process. do.

First, when a subscriber who returns to the home GSM service area requests a location update to the HLR 220 through the MSC 230 of the GSM system 200 (S400), the HLR 220 is a VLR of the GSM system 200. Requests to delete the location of the subscriber to the IRGS (300) performing the function of (S410).

Next, the IRGS 300 that receives the location deletion request from the HLR 220 requests the VLR 130 of the CDMA system 100 to delete the location (S420). At this time, in the case of using the TMIN as in the second embodiment, the IRGS 300 requests the VLR 130 to delete the TMIN corresponding to the IMSI.

Meanwhile, the VLR 130 of the CDMA system 100 deletes the location of the subscriber according to the request of the IRGS 300, and then transmits a deletion completion response to the IRGS 300 (S430).

The IRGS 300 that receives the location deletion completion response from the VLR 130 of the CDMA system 100 transmits the location deletion completion response to the HLR 220 of the GSM system 200, as in the second embodiment. In this case using the TMIN releases the TMIN corresponding to the IMSI (S440).

The HLR 220 receiving the location deletion complete response from the IRGS 300 then transmits the location deletion complete response to the GSM terminal 250 via the MSC 230 and the BSS 240 of the GSM system 200. The subscriber notifies that the location update registration is completed due to the return from the CDMA service area (S450).

Hereinafter, a process of roaming subscribers originating in the CDMA service area will be described.

First, a fifth embodiment in which a roaming subscriber sends a GSM subscriber in a home GSM service area will be described with reference to FIG. 7.

At this time, when using the same method as in the first embodiment, IMSI is used as it is, and when using the same method as in the second embodiment, TMIN is used instead of IMSI.

First, when a roaming subscriber requests a voice call to the MSC 130 through the BSS 140 of the CDMA system 100 using the CDMA terminal 150 (S500), the MSC 130 of the CDMA system 100 is requested. Performs authentication of the corresponding roaming subscriber. This authentication process is performed when the IMSI is used, the same process as the location registration process (S102 ~ S136) described in the first embodiment with reference to Figures 2 and 3, and when using the TMIN Figure 4 With reference to the same process as the location registration process (S20 ~ S236) described in the second embodiment is performed, this process is applied as described in the third embodiment with reference to Figures 5a and 5b The detailed description is omitted. At this time, in the present embodiment, that is, the fifth embodiment, the steps S102 and S202 are not a location registration request step as in the first, second, and third embodiments, but authentication of the roaming subscriber. Only the request step is different.

Therefore, as described above, when IMSI is used, the MSC 130 of the CDMA system 100 starts the step of requesting authentication of the roaming subscriber (S102), completes the location registration, and then responds to the CDMA terminal 150. In step S136, when the TMIN is used, the MSC 130 of the CDMA system 100 transmits information including the IMSI received from the CDMA terminal 150 to the IRGS 300. Although starting from the step S20 to completing the location registration and transmitting the response to the CDMA terminal 150 (S236) as the authentication process in this embodiment, the authentication process is performed according to the system design. Although not included, it is preferable to proceed to the next process through this authentication process. Meanwhile, since this authentication process can be easily understood with reference to FIGS. 5A and 5B referred to in the third embodiment, in the present embodiment, a process in which the authentication process is excluded, in particular IMSI, is used to simplify the description. Only a description of the process of the case is shown in FIG.

After the above authentication process is completed, the MSC 130 of the CDMA system 100 requests the IRGS 300 for incoming routing information necessary for call setup, that is, location information of the called terminal (S510).

After receiving the incoming routing information request from the MSC 120 of the CDMA system 100, the IRGS 300 recognizes that the called subscriber is a GSM service subscriber, and then sends the incoming routing information to the HLR 220 of the GSM system 200. Request (S520). At this time, the IRGS 300 converts the incoming routing information request message of the CDMA system 100 into a message of the GSM system 200 and transmits the message to the HLR 220.

The HLR 220 of the GSM system 200 receiving the incoming routing information request from the IRGS 300 requests the corresponding routing information from the corresponding VLR 230 (S530), and the corresponding VLR 230 transmits the corresponding routing information to the HLR. Transmitting to the 220 (S540).

Next, the HLR 220 of the GSM system 200 receiving the corresponding routing information from the VLR 230 transmits the received routing information to the IRGS 300 (S550), and the IRGS 300 transmits the received routing information. The CDMA system 100 converts the routing information to the MSC 130 (S560).

Thereafter, the MSC 130 of the CDMA system 100 that has received the incoming routing information knows that the called party is the MSC 230 of the home GSM system 200 through the routing information, and then directly contacts the MSC 230. By connecting the actual voice call is made (S570).

Next, a sixth embodiment in which a roaming subscriber sends to another roaming subscriber in a CDMA service area will be described with reference to FIG. 8.

First, when a roaming subscriber requests a voice call to the MSC 130 through the BSS 140 of the CDMA system 100 using the CDMA terminal 150 (S600), the MSC 130 of the CDMA system 100 is transmitted. Performs authentication of the corresponding roaming subscriber. This authentication process is performed in the same manner as the authentication process performed in the sixth embodiment described above. That is, when IMSI is used, the MSC 130 of the CDMA system 100 starts the step of requesting authentication of the roaming subscriber (S102), completes the location registration, and then transmits a response to the CDMA terminal 150. If the process up to (S136), if the TMIN is used, the MSC (130) starts the location registration starting from the step (S20) of transmitting information including the IMSI received from the CDMA terminal 150 to the IRGS (300) After completion, the process up to step S236 of transmitting a response to the CDMA terminal 150 is performed as an authentication process. At this time, such an authentication process may not be included according to the system design, but preferably, the authentication process proceeds to the next process. Meanwhile, this authentication process can be easily understood with reference to FIGS. 5A and 5B referred to in the third embodiment as in the sixth embodiment described above. In this embodiment, the authentication process is omitted for simplicity. Only a description of the process, particularly the process only when IMSI is used, is shown in FIG. 8.

After the above authentication process is completed, the MSC 130 of the CDMA system 100 requests the IRGS 300 for incoming routing information necessary for call setup, that is, location information of the called terminal (S610).

Next, the IRGS 300 receiving the incoming routing information request from the MSC 130 recognizes that the called subscriber is a GSM service subscriber, and then requests the incoming routing information from the HLR 220 of the GSM system 200 (S620). ). At this time, the IRGS 300 converts the incoming routing information request message of the CDMA system 100 into a message of the GSM system 200 and transmits the message to the HLR 220.

After receiving the incoming routing information request from the IRGS 300, the HLR 220 of the GSM system 200 recognizes that the corresponding VLR is the IRGS 300, and then requests the corresponding routing information from the IRGS 300 ( S630), the IRGS 300 corresponding to the VLR requests routing information from another VLR 130 'of the CDMA system 100 (S640).

The VLR 130 'of the CDMA system 100 receiving the routing information request from the IRGS 300 performs an authentication process performed before the step S610 of requesting the IRGS 300 for location information of the called terminal. The authentication process for another roaming subscriber using the terminal 150 'is performed. This authentication process is performed in the same manner as the authentication process performed before the step S61, but the difference is that authentication is performed for another roaming subscriber using the called terminal 150 '. That is, when IMSI is used, the MSC 130 'of the CDMA system 100 responds after completing location registration starting from step S102 of requesting authentication of a roaming subscriber using the called terminal 150'. To the step S136 of transmitting the message to the called terminal 150 ', when the TMIN is used, the MSC 130' of the CDMA system 100 includes the IMSI received from the called terminal 150 '. Starting from the step S20 of transmitting the information to the IRGS 300, the process from the step S236 of transmitting the response to the destination terminal 150 ′ after completing the location registration is performed as the authentication process. In this case, such an authentication process may not be included according to the system design, but it is preferable to proceed to the next process through such an authentication process. Meanwhile, the third authentication process is performed like the sixth embodiment described above. 5A and 5B referenced in the example, it may be easily understood. In the present embodiment, for the sake of simplicity, only the description of the process excluding the authentication process, particularly the process only in the case where IMSI is used will be described with reference to FIG. 8. Shown in

As such, after authentication of another roaming subscriber using the called terminal 150 'is completed, the VLR 130' of the CDMA system 100 transmits routing information of the called roaming terminal to the IRGS 300 ( S650), the IRGS 300 converts the routing information received from the VLR 130 'of the CDMA system 100 into routing information of the GSM system 200 and transmits the routing information to the HLR 220 of the GSM system 200 ( S660).

At this time, the scheme according to the second embodiment requires routing information of the TMIN corresponding to the IMSI.

Next, the HLR 220 of the GSM system 200 receiving the routing information from the IRGS 300 retransmits the received routing information to the IRGS 300 (S670), and the IRGS 300 transmits the received routing information. The data is converted into routing information of the CDMA system 100 and transferred to the MSC 130 of the CDMA system 100 (S680). As such, even when the IRGS 300 knows the routing information of the called subscriber, the retransmission process is performed in order to prevent the change of the call processing process of the conventional GSM system 200.

Thereafter, the MSC 130 of the CDMA system 100 that has received the incoming routing information is accessible through the MSC 130 'of another CDMA system 100 as another roaming subscriber whose location is another roaming subscriber through the routing information. Knowing that the actual voice call is made by directly connecting to the MSC (130 ') (S690).

Next, a seventh embodiment in which a roaming subscriber receives a call within a CDMA service area will be described with reference to FIG. 9.

Here, only the case where the roaming subscriber is incoming from the subscriber in the home GSM coverage area will be described, but the process of the roaming subscriber from another roaming subscriber in the CDMA coverage area can be easily understood in the sixth embodiment described above. Omit.

First, if a subscriber in a GSM service area requests a voice call to the MSC 230 through the BSS 240 of the GSM system 200 using the GSM terminal 250 (S700), the MSC of the GSM system 200 230 requests the HLR 220 of the GSM system 200 for incoming routing information necessary for call setup, that is, location information of the called terminal (S710).

After receiving the incoming routing information request from the MSC 230 of the GSM system 200, the HLR 220 of the GSM system 200 requests the incoming routing information from the IRGS 300 recognized as the VLR of the corresponding roaming subscriber (S720). IRGS 300 receives the routing information request and requests routing information from the corresponding VLR 130 of the CDMA system 100 (S730).

The VLR 130 of the CDMA system 100 that receives the routing information request from the IRGS 300 performs an authentication process for the roaming subscriber using the called CDMA terminal 150. This authentication process is performed in the same manner as the authentication process performed in the sixth embodiment described above. That is, when IMSI is used, the MSC 130 of the CDMA system 100 starts the step of requesting authentication of the roaming subscriber (S102), completes the location registration, and transmits a response to the called CDMA terminal 150. In step S136, when TMIN is used, the MSC 130 of the CDMA system 100 transmits information including the IMSI received from the incoming CDMA terminal 150 to the IRGS 300 ( Starting from S20 and completing location registration, the process up to step S236 of transmitting a response to the called CDMA terminal 150 is performed as an authentication process. At this time, such an authentication process may not be included according to the system design, but preferably, the authentication process proceeds to the next process. Meanwhile, this authentication process can be easily understood with reference to FIGS. 5A and 5B referred to in the third embodiment as in the sixth embodiment described above. In this embodiment, the authentication process is omitted for simplicity. Only a description of the process, particularly the process only when IMSI is used, is shown in FIG. 9.

As such, after authentication for the roaming subscriber using the called terminal 150 is completed, the VLR 130 of the CDMA system 100 transmits the corresponding routing information to the IRGS 300 (S740), and the IRGS 300. Converts the received routing information into routing information of the GSM system 200 and transmits the converted routing information to the HLR 220 of the GSM system 200 (S750).

At this time, the scheme according to the second embodiment requires routing information of the TMIN corresponding to the IMSI.

Thereafter, when the HLR 220 of the GSM system 200 transmits the corresponding routing information received from the IRGS 300 to the MSC 230 of the GSM system 200 (S760), the MSC 230 receives the received routing information. By knowing the location of the called party through the routing information is the MSC 130 of the CDMA system 100 in the CDMA service area, the actual voice call is made by directly connecting with the corresponding MSC 130 (S770).

Next, the short message service of the roaming subscriber described above will be described.

In the short message service for roaming subscribers, the IRGS 300 functions as an SMC, and the IRGS 300 receives and processes both message transmission and reception.

First, an eighth embodiment in which a roaming subscriber sends a short message to a GSM service subscriber in a home GSM service area will be described with reference to FIG. 10.

When the roaming subscriber in the CDMA service area requests the short message transmission using the CDMA terminal 150 (S800), the BSS 140 and the MSC 130 of the CDMA system 100 receive the short message from the CDMA terminal 150. Receives and delivers to the IRGS (300) (S810).

Meanwhile, since the IRGS 300 is responsible for the function of the SMC, when a short message is received from the MSC 130 of the CDMA system 100, the IRGS 300 transmits a reception completion response to the MSC 130 (S820), and then the location information of the called terminal. To the HLR 220 of the GSM system 200 (S830).

The HLR 220 of the GSM system 200 receiving the location information request from the IRGS 300 transmits the location information of the called terminal to the IRGS 300 (S840), and the IRGS 300 of the GSM system 200. The MSC 230 of the GSM system 200 corresponding to the location information transmitted from the HLR 220 converts the short message previously received into a GSM system 200 format message (S850).

Thereafter, the MSC 230 of the GSM system 200 receiving the message from the IRGS 300 transmits a response indicating that the message reception is completed to the IRGS 300 (S860), and then sends the short message to the BSS 240. Complete by transmitting to the GSM terminal 250 through (S870).

Next, a ninth embodiment in which a roaming subscriber receives a short message from a subscriber in a home GSM service area will be described with reference to FIG.

First, when the subscriber in the home GSM service area requests the short message transmission using the GSM terminal 250 (S900), the MSC 230 of the GSM system 2200 receives the short message from the GSM terminal 250 and receives the GSM message. Transfer to the SMC 270 of the system 200 (S910).

Meanwhile, when the short message is received from the MSC 230 of the GSM system 200, the SMC 270 transmits a location information request of the called terminal to the HLR 220 of the GSM system 200 (S920).

The HLR 220 of the GSM system 200 receiving the location information request from the SMC 270 transmits the location information of the called terminal to the SMC 270 (S930), and the SMC 270 of the CDMA system 100 The short message received before is transmitted to the IRGS 300 in charge of the SMC function (S940). At this time, the IRGS 300 transmits a short message reception completion response to the SMC 270 (S950).

Thereafter, the IRGS 300 converts the received short message into a message in the form of a CDMA system 100 and transfers it to the MSC 130 of the corresponding CDMA system 100 (S960), and the MSC 130 completes receiving the message. After transmitting the response to the IRGS 300 (S970), the short message is transmitted to the CDMA terminal 150 through the BSS 140 of the CDMA system 100 to complete (S980).

Although the present invention has been described with reference to the most practical and preferred embodiments, the present invention is not limited to the above disclosed embodiments, but also includes various modifications and equivalents within the scope of the following claims.

For example, a detailed description of a process in which a roaming subscriber sends a short message to another roaming subscriber or a process in which a roaming subscriber receives a short message from another roaming subscriber is omitted. Reference will be readily appreciated by those skilled in the art.

Also, in the present embodiments, only the roaming service in the CDMA service area is described by mounting the GSM SIM card in the CDMA terminal 150. However, referring to the present embodiments, the UIM card is mounted in the GSM terminal 250. It is obvious that roaming services in the GSM service area can be easily understood.

According to the present invention, a GSM service subscriber can use his or her SIM card and his / her own number within a CDMA service area.

In addition, by performing location registration with the GSM system 200 using the CDMA data burst message, roaming service by the GSM SIM card is possible by minimizing the existing network change.

Claims (2)

(Correction) A CDMA system connected to a GSM system and an international roaming gateway system connected between the CDMA system and the GSM system to perform signal conversion between the systems so as to perform signal exchange between the CDMA system and the GSM service subscriber. A roaming service system performing roaming service in a region, the method of registering a location when a GSM service subscriber roaming in the CDMA service returns to the GSM service area after using the CDMA service, (a) the roaming gateway system interoperates with the GSM system to perform service authentication of the CDMA terminal equipped with the SIM card, and receives the subscriber profile for the SIM card from the GSM system, Performing location registration for the CDMA terminal; (b) a terminal of a roaming subscriber returning from the CDMA service area to the GSM service area requesting a location update from the HLR of the GSM system through the MSC of the GSM system; (c) the HLR of the GSM system requesting an international roaming gateway system that performed a VLR function for a terminal of the roaming subscriber in a CDMA service area to delete the subscriber's location; And (d) the international roaming gateway system requesting a VLR of a CDMA system to delete a location for the roaming subscriber station; Including; Step (a) is Receiving, by the international roaming gateway system, an authentication parameter including an authentication value and an authentication algorithm initial value from the HLR of the GSM system; Sending, by the international roaming gateway system, the authentication algorithm initial value to the CDMA terminal; Receiving, by the international roaming gateway system, an authentication value calculated from the CDMA terminal based on the initial value of the authentication algorithm; And The international roaming gateway system compares the authentication value calculated by the CDMA terminal with the authentication value received from the HLR of the GSM system to perform authentication. How to register your location. (Correction) The method according to claim 1, The international roaming gateway system stores a specified MIN (TMIN) corresponding to the IMSI stored in the SIM card. The step (c) further includes the step of deleting the TMIN stored in the international roaming gateway system, The step (d) further includes the international roaming gateway system requesting the VLR of the CDMA system to delete the TMIN corresponding to IMSI.