KR0182235B1 - Roming service method - Google Patents

Abstract

The present invention relates to a roaming service method between an international mobile telephone network or a heterogeneous mobile telephone network, and enables a mobile subscriber to receive all calls received by his / her number while traveling abroad as well as in the home country where the service is registered. When a subscriber is located in any area that uses heterogeneous systems with different interface specifications, the mobile telephone service can be used between international mobile phone networks or heterogeneous mobile phone networks to enable mobile phone services regardless of the current location and the service system of the location. In order to provide a roaming service method, a first step of translating a roaming service code, its own phone number and password to register a call transfer service in a home location register before moving after receiving a calling terminal number if roaming service registration request is requested; A second step of requesting location information of the called party upon receiving an incoming call setting request and setting up a call route to the moved home location register when receiving a call forwarding number unconditionally with a called location information response message; And a third step of translating the roaming service code, their phone number, and password to unregister the roaming service if the roaming service is unregistered. It is possible to reduce the burden on the enormous development cost anticipated during the change process, save time, and prevent the deterioration of service quality.

Description

Roaming service method between international mobile phone network or heterogeneous mobile phone network

1A and 1B are diagrams illustrating a general mobile telephone network.

2 is a diagram illustrating a conventional roaming method using a dual mode terminal.

Figure 3 is an illustration of a conventional roaming method using a card removable terminal.

4 is a configuration diagram of hardware in which the present invention is implemented.

5 is a configuration diagram of a mobile communication network to which the present invention is applied.

6 is an exemplary view of a service registration processing procedure according to the present invention.

7a to 7d are flowcharts of one embodiment of a service registration processing procedure according to the present invention;

8 is another exemplary diagram of a service registration processing procedure according to the present invention;

9 is an illustration of a call processing procedure according to the present invention.

10 is a flowchart of a call processing procedure according to the present invention.

* Explanation of symbols for main parts of the drawings

40: ILR 41: database

42, 48: control unit 43, 52: maintenance unit

44: signal processing connection 45, 46: operator connection

47: call path 49: relay line connection

50: subscriber connection unit 51: signal device unit

The present invention relates to a roaming service method between an international mobile telephone network or a heterogeneous mobile telephone network.

1A and 1B are schematic diagrams of a general mobile telephone network.

Mobile phone system is generally composed of the Home Location Register (HLR) (11) that stores the location information and service information of the home subscriber, the MSC (Moblile Switching Center) (12) responsible for the call connection function, mainly inside the MSC It consists of a VLR (Visitor Location Register) 13 which stores visitor's information, a BS (Base Station) 14 which functions as an interface between a wired network and a wireless section, and an MS (Mobile Station) 15 which is a subscriber terminal. . The VLR 13 may be located outside the MSC in some cases, and the BS 14 may be divided into a base station controller (BTS) and a base station controller (BSC).

Usually, there can be multiple HLRs 11 in one service network, and one or more VLR / MSCs 12 and 13 can be connected to one HLR 11, and one MSC 12 can be connected to one HLR 11. Several BSs 14 may be connected.

1b shows a mobile telephone service environment in which a plurality of networks exist (BS is omitted). In the network 1, assume that the MS is a subscriber having HLR2 as a home, and the MS attempts to register a location in the service area of the MSC / VLR2, the location registration message generated at the MS is transmitted to the MSC / VLR2 through the BS. . The MSC / VLR2 analyzes the subscriber number of the MS requesting the location registration to determine the HLR where the location information should be stored. The location registration message is transmitted to HLR2, which is the home of the subscriber who attempted location registration according to the internal data of the MSC / VLR2. If all the subscriber information is valid, the location information of the subscriber is updated in HLR2, and the location registration response message is transmitted to MSC / VLR2. At this time, the subscriber's data is generated in the VLR, and future call processing and data processing are possible.

Network 2 is different from Network 1 and is assumed to be a network operated by different operators or a separate network operated in different countries. If the MS located in the network 1 moves to the network 2 area and is located in the service area managed by MSC / VLR7, if the MS is to receive call service from any telephone network or mobile phone network at the current location, Location registration must be performed in network 2 and the MSC / VLR7 address of network 2 currently located in HLR2, the subscriber's home location register, must be registered. In order to enable such location registration, the radio interface specification between MS and BS used in network 1 and network 2 must be the same. Otherwise, even when registering location for roaming between networks, it is impossible.

In order to enable roaming between two networks having different wireless interface standards, there may be a method using a dual mode terminal.

2 is a diagram illustrating a conventional roaming method using a dual mode terminal.

If the air interface standard of the network 1 serviced in the country 1 is called CAI (Common Air Interface) 1 and the air interface standard of the network 2 serviced in the country 2 is called CAI 2, the dual-mode terminal is used in the service area of the network 1. CAI 1 is connected to Network 1, and in the service area of Network 2, CAI 2 is connected to Network 2. That is, the terminal is to provide all of the wireless interface specifications of the area where the subscriber's location movement is expected.

However, it is very difficult to develop a new dual-mode terminal for international roaming service so that the subscriber can replace the terminal, and when the subscriber moves to the service area using the third wireless interface standard CAI 3 In the terminal of, only CAI 1 and CAI 2 are provided so that the wireless network cannot be established between the service network and the terminal.

In addition, consideration should be given to the possibility of moving to the fourth and fifth service networks. Therefore, in order to solve this problem, a multi-mode terminal is required. However, development of such a multi-mode terminal is almost impossible due to the current technology level and market formation conditions.

On the other hand, another method that has emerged to solve the problem of wireless access is to use a subscriber identity card (ID Card), called a SIM (Set Initialization Mode) card or a Smart Card.

3 is an explanatory diagram of a conventional roaming method using a card removable terminal.

The subscriber is given a card containing information such as his mobile identification number (MIN) and electronic serial number (ESN), and the terminal should be structured to be removable. . If the country 1 wants to receive service in the network 1 area using CAI 1, the subscriber can insert the card containing his information into the card removable terminal 1 applied to the CAI 1 standard to receive the service. If the subscriber wants to be serviced in the network 2 of the country 2 using the different wireless access standard CAI 2, the subscriber should remove the card inserted in the terminal 1 and insert it into the terminal 2 providing the CAI 2 standard for service. It is a concept.

However, it is very difficult to replace the current terminal with this type of terminal due to the current domestic and foreign mobile phone service conditions, and moreover, it is almost impossible in the near future. In addition, even if the current terminal is replaced with a card removable terminal, the number system used for each country or manganese is different from each other. It must be preceded. Therefore, this method also has little possibility of realization in the near future, and for this reason, roaming service between countries or networks using different radio access standards is hardly achieved.

Looking at the overall prior art described above as follows.

The mobile telephone networks currently used in various countries around the world apply different wireless and wired network interface standards by region or country. Moreover, existing analog mobile telephone service technologies and code division multiple access / time division multiple access (CDMA / TDMA) are used. With the coexistence of digital mobile phone services, the application of inter-roaming services between countries has become a very difficult problem.

Currently, North America Protocol Standard (IS41) and European Protocol Standard (GSM MAP) have been established as protocol standards for realizing interworking between heterogeneous networks, but these protocol standards are based on the premise of using the same wireless access interface. Can be enabled.

For example, when a roaming service occurs between countries, if a subscriber registered for CDMA mobile phone service in Korea travels to Japan, the subscriber should use the terminal used in Korea and receive his / her own You should be able to receive incoming services with a number. In order to provide this service, the location information of the subscriber located in Japan must be stored in the HLR in Korea, and interworking with the Japanese VLR may be required for the incoming call processing. Such interworking MAP (Mobile Application Part) interworking function may be possible by performing a protocol conversion function by mutual agreement according to the above-mentioned standard protocol.

However, basically, the CDMA air interface standard of Korea and the Japan air interface standard (PDC) of Japan are different from each other, and thus wireless connection cannot be established, and the MAP protocol interworking between networks loses its meaning.

In order to overcome these differences in the air interface, the use of a dual-mode terminal is being discussed. However, dual mode terminals have many disadvantages compared to single mode terminals in price and size, and recommending subscribers to purchase dual mode terminals for intermittent international roaming is hardly persuasive in terms of market formation. In addition, when roaming to a third station is required, a tri-mode terminal is required, and further, a multi-mode terminal is required.

Another way to overcome the differences in the air interface is to use a SIM card or a smart card. This method inserts a card containing subscriber's mobile phone number (MIN) and device number (ESM) into the terminal and uses it as if it is its own terminal.

However, in order to provide international roaming services in this way, the terminal currently in use must be replaced with a card-removable terminal. The production potential and time of mass production of these terminals are unpredictable. Therefore, in order to provide international roaming service, another technical solution should be devised.

In addition, the method proposed up to now in terms of the network protocol is to place a protocol conversion device between the two networks to be interworked to perform the MAP protocol and the lower level signaling protocol connection function between the two networks.

In case of implementing international roaming service using only this method, MSC and HLR functions of existing mobile telephone network should be supplemented and developed. It is necessary to rely on foreign companies for development, which usually requires a lot of development costs and time.

The present invention has been made to solve the above problems, while traveling to foreign countries as well as in the country where the mobile subscriber registered for the service in order to revitalize the diversified mobile phone users' service needs and socio-economic needs for globalization. Receive all calls to their number, and if the subscriber is located in any area served by heterogeneous systems with different interface specifications, regardless of their current location and the service system of the location An object of the present invention is to provide a roaming service method between an international mobile telephone network or a heterogeneous mobile telephone network to enable a service.

In order to achieve the above object, the present invention, in the roaming service method between the international mobile telephone network or heterogeneous mobile telephone network applied to a general mobile telephone network, if the roaming service registration request by translating the roaming service code, its own phone number and password A first step of registering a call transfer service unconditionally with a home location register before moving after receiving a calling terminal number; A second step of requesting the location information of the called subscriber upon receiving the incoming call setting request and setting up a call route to the moved home location register when receiving a call forwarding number unconditionally by the incoming location information response message; And a third step of translating the roaming service code, its own phone number, and a password, and unregistering the transfer service unconditionally to the home wee register before moving after receiving the calling terminal number. .

Hereinafter, an embodiment according to the present invention will be described in detail with reference to FIGS. 4 to 10.

4 is a configuration diagram of the hardware on which the present invention is implemented, in which 40 is an ILR, 41 is a database, 42 and 48 are controls, 43 and 52 are maintenance units, 44 is a signal processing connection unit, and 45 and 46 are operators. A connection part, 47 is a call path part, 49 is a relay line connection part, 50 is a subscriber part, and 51 is a signal device part, respectively.

The Interworking Location Register (ILR) 40 in which roaming subscriber information is stored is identical to the hardware structure of the HLR currently used in the mobile telephone network. That is, it has a structure in which the signal processing connecting portion 44 is added to the general computer structure.

The database 41 stores location information and service information of subscribers who have registered roaming services, and the controller 42 is in charge of various control functions required for call processing, maintenance, and the like.

The maintenance unit 43 manages and analyzes operation information such as failure detection and recovery, prevention, and measurement statistical information for various devices. The signal processing connection unit 44 is a signal protocol processing function such as a common line (No. 7) signal processing function for exchanging and receiving signal information necessary for communication with other network components such as an exchange and a physical layer connection function required for signaling. Do this. The operator connection unit 45 performs a connection function for various input / output devices such as an operator terminal required for system operation.

Interworking Switching (ISW) 53, which is located in the manganese where roaming service is to be performed and performs call routing and signal conversion functions, can be configured as an MSC or a general exchange, and only a functional block for processing a general exchange function is shown in the drawing. It was.

The operator connection unit 46 performs a connection function for various input / output devices such as an operator terminal required for system operation. The call path unit 47 is composed of a time switch, a space split switch, and the like, and is in charge of setting an actual call path, and the controller 48 performs an overall control function related to call processing and operation maintenance.

The relay line connection unit 49 provides a call path and a signal path with another system, and the subscriber line unit 50 may be connected to a general wired subscriber or a base station controller or a base station to perform a subscriber registration function.

The signal device 51 performs a signal processing function necessary for MAP protocol and call processing. The maintenance unit 52 performs a status management function for various devices and software in the system, and operation maintenance functions such as monitoring, detecting, isolating, and charging and measuring statistics of failures.

5 is a configuration diagram of a mobile communication network to which the present invention is applied.

In order for the present invention to be implemented, the ILR and the ISW are located between the network 1 of the country 1 and the network 2 of the country 2 which perform the mobile telephone service. MSC 1 of network 1 and MSC 2 of network 2 are connected to ISW, ILR, and relay line for establishing signal link and communication path for MAP message communication, respectively.

In the mobile telephone network, terminal mobility is basically provided, so when the subscriber who used MS 2 in the network 2 of the country 2 moves to the network 1 of the country 1 and uses the MS 1 serviced in the network, the country 1 Calling and receiving by the terminal number given in Network 1 is possible.

However, Service Subscriber 1 was using MS 2 with its own number in Network 2 in Country 2, and Network 2 in Country 2 and any acquaintances in the world who wanted to make an incoming call with Subscriber 1 were service subscriber 1 The number of MS 2 given to the user is dialed and a call is attempted. However, service subscriber 1 has moved to network 1 of country 1, and MS 2 cannot be used in network 1 of country 1 because the radio access standards and number plans of network 1 of country 1 and network 2 of country 2 are different. .

The present invention enables incoming calls to be attempted from any acquaintances in this case who do not know the mobility of service subscriber 1 or the number of MS 1 that the service subscriber uses in network 1 of country 1.

6 is an example of a service registration processing procedure according to the present invention.

If the subscriber receiving service in network 2 wants to receive the call that is received by his / her subscriber number as it moves to the network 1 area, the subscriber must select any terminal MS1 in network 1 that uses the access standard of the network. By using the home location register to activate the roaming service in the following way it can have the same effect as the location registration.

The service subscriber 1 who has moved from the network 2 of the country 2 to the network 1 of the country 1 inputs an international roaming service code and his / her number and password to be received by using the terminal MS1 used in the network 1. MSC 1, which is currently in service, does not require any hardware or software changes for this service, and only needs to perform data operations to translate service codes and set outgoing calls with ISW.

The ISW analyzes the incoming number and requests and receives the calling number from the calling station when the international roaming service code is confirmed. When ISW receives the calling number, it requests ILR to activate international roaming service.

The ILR stores information on subscribers who have registered for international roaming services, and verifies the validity of subscribers attempting to activate the service using their own number and password received from ISW. When verification of the validity of the subscriber is completed, the call request service registration request is unconditionally transmitted to the subscriber of the service requesting subscriber's home location register, HLR 2. In this case, the service registration message transmitted from the ILR to the HLR 2 uses the service registration MAP message generally used between the MSC / VLR and the HLR in the network 2 of the country 2, and is used by the corresponding subscriber in the network 1 of the country 1. The transfer number is configured by inserting the country code into the terminal number of MS 1 so that the call transfer service can be performed unconditionally to the terminal.

The HLR 2 receiving the service registration request unconditionally activates the call transfer service for the subscriber, and the call forwarding number includes the called party number of the terminal used in the network 1 of the country 1 received from the ILR. When this procedure is completed, the service registration response message is sent to the ILR.

Upon receiving the service registration response message, the ILR sends an international roaming service registration response message to the ISW. Upon receiving the international roaming service registration response message, the ISW transmits a confirmation tone indicating that the service registration is completed.

7A to 7D are flowcharts of one embodiment of a service registration processing procedure according to the present invention.

FIG. 7A is a flowchart of a service registration process at an originating exchange, in which service subscriber 1 who has moved from network 2 of country 2 to network 1 of state 2 in idle state 71 roams internationally using a terminal MS1 used in network 1; If the service code and the number and password of the terminal to be received are input (72), the calling exchange performs the same number translation procedure as the existing call processing. In the existing MSC 1, the service code is translated and the outgoing call code is set by the ISW (73).

When the outgoing line is occupied, the source switching center MSC 1 transmits all numbers entered by the subscriber to the ISW (74). The ISW analyzes the incoming number and requests the calling number from the calling station when the international roaming service code is confirmed (75).

The originating switching center transmits the calling terminal number to the ISW when receiving the calling number request signal from the ISW during or after the called party is transmitted (76). When the called party and the calling party have completed the transmission, the receiver waits for the incoming response in the waiting state (77). Receiving an answer message (78) establishes a call path and maintains a normal busy state (79).

7B and 7C are a service registration procedure and a flow chart in ISW and ILR. In idle state, ISW receives an incoming call setup request and receives a certain number of incoming call numbers (81). In operation 82, the service registration request is checked (83). The ILR stores information on subscribers who have registered for international roaming services and verifies the validity of subscribers attempting to activate the service using their own number and password received from ISW (84, 85). When the validity of the subscriber to the service registration request is verified, the calling party requests the calling party number (86) and receives the number of the calling terminal (87).

The service registration message transmitted from the ILR to the HLR2 uses the MAP message for service registration generally used between the MSC / VLR and the HLR in the network 2 of the country 2, and is called unconditionally from the network 1 of the country 1 to the terminal used by the subscriber. The transfer number is configured by inserting the country code into the terminal number of MS 1 so that the switching service can be performed (88). In order to activate the service, a service activation request message is generated (89) and transmitted to the HLR (90).

Upon receipt of a successful service activation result from the calling subscriber's HLR (91, 92), a response message is sent to the calling switching center (93) and an acknowledgment is generated (93) to allow the calling subscriber to confirm the successful service activation.

7d is a flow chart of a service registration procedure at the HLR, where in the message waiting state 96 the HLR receives a service activation request message from the ISW (97). After receiving the service registration request, the HLR activates the transfer service unconditionally for the subscriber after verifying the subscriber's validity, and the called party number for the transfer includes the called party number of the terminal used in the network 1 of the country 1 received from the ILR ( 98).

If the unconditional transfer service activation is successfully completed, the service activation response message is transmitted to the ISW (99).

Meanwhile, the process of requesting service registration by the service requesting subscriber to the HLR may be performed by the ISW rather than by the ILR. In this case, the ILR verifies the validity of the service and transmits the result to the ISW. If the subscriber is a valid subscriber, the ILR may perform a service registration procedure with the HLR 2 in the ISW.

8 is another exemplary diagram of a service registration processing procedure according to the present invention.

The service subscriber 1 who has moved from the network 2 of the country 2 to the network 1 of the country 1 inputs the international roaming service code and its own number and password to be received by using the terminal used in the network 1. MSC 1, which is currently in service, does not require any hardware or software changes for this service, and only needs to perform data operations to translate service codes and set outgoing calls with ISW.

The ISW analyzes the incoming number and requests and receives the calling number from the calling station when the international roaming service code is confirmed. The ISW, which has received the calling number, requests subscriber validation to the ILR.

The ILR verifies the validity of the subscriber who attempts the service by using the password of the subscriber who registered the international roaming service. When the verification of the validity of the subscriber is completed, the result is notified to the ISW.

The ISW sends a service registration request for the subscriber to HLR 2, the home location register of the service subscriber. At this time, the service registration message transmitted to the HLR 2 uses the service registration MAP message generally used between the MSC / VLR and the HLR in the network 2 of the country 2 as it is, and is unconditionally used as a terminal used by the corresponding subscriber in the network 1 of the country 1 The transfer number is configured by inserting the country code into the terminal number of MS 1 so that the transfer service can be performed.

In the HLR 2 receiving the service registration request, the call forwarding service is activated unconditionally for the corresponding subscriber, and the call forwarding number includes the called party number of the terminal used in the network 1 of the country 1 received from the ILR. When this procedure is completed, the service registration response message is sent to the ISW. Upon receiving the service registration response message, the ISW transmits a confirmation tone indicating that the service registration is completed.

By using this type of service registration procedure, it is not necessary to change the hardware and software of the existing operating system, and the service can be implemented by only general data work required for operating the exchange system.

9 is an illustration of a call processing procedure according to the present invention.

For example, a process of dialing the MS 2 number, which is the subscriber number 2 of the service subscriber 1, in any network such as the network 2 subscriber of the country 2 or the public telecommunication network (PSTN) of 2, The acquaintances of subscriber 1 dial the number of MS 2 known to them to talk to subscriber 1.

The originated call is sent to HLR 2, the home location register registered with the MS 2 number of subscriber 1, through any exchange of network 2 of country 2. At this time, in the HLR 2, the international roaming service is activated by the method described in FIG. 6 to FIG. The service is intended to be performed.

The MSC 2, which has received the called location information response message, performs a call processing procedure to the MS 1 number of the network 1 of the country 1, which is the forwarding number included in the message. MSC 2 is connected to the gateway switch of the international telephone provider network which is set up for the existing international telephone call. This gateway exchange routes a call to Network 1 of the country 1 where MS 1, where actual incoming calls should be made, is being served.

In the MSC 1, the MS 1 requests the called location information to the registered HLR 1 in the same manner as the general incoming call processing procedure, and the HLR 1 transmits the response to the MSC 1 to establish the call path.

In the call processing process as described above, the existing network processing method is used as it is and there are no changes in hardware and software of the operating system. However, the calling subscriber does not know that the call he attempted is set as an international call, so he has to bear the unexpected international rate. Therefore, in the process of setting up the incoming call, the announcement should be performed so that the caller can recognize that the current call is an international call. This announcement can be easily handled by routing a call from the gateway switch to the ISW without the burden of changing or loading existing systems. In ISW, the announcement is sent to the calling party so that the caller can stop the call. If the caller does not stop the call, the route routed to Network 1 of the country 1 is processed through MSC 1 and HLR 1. The method for terminating the roaming service is the same as the procedure for registering a service described with reference to FIGS. 6 to 8, and the service subscriber only needs to use the termination service code.

10 is a flowchart of a call processing procedure according to the present invention.

In idle state (101), if one acquaintance's acquaintances dial the number of MS 1 known to them to talk to subscriber 1, MSC 2 receives an incoming call setup request (102). Requesting location information for the called subscriber to HLR 2, the home location register with which the MS 2 number of the service subscriber 1 is registered, through any switch of the subscriber (103). At this time, in the HLR 2, the international roaming service is activated by the method described in FIGS. 6 to 8, and the call transfer service is unconditionally transferred to the MS 1 used by the network 1 of the country 1 for the call that is received by the subscriber 2 of the service subscriber 1. Is supposed to be performed. Accordingly, upon receiving the called location information response message from the HLR 2 (104), the MSC 2 performs a call processing procedure to the MS 1 number of the network 1 of the country 1, which is the forwarding number included in the message. MSC 2 is connected through ISW to the gateway switch of an international telephone provider network set up for an existing international telephone call (105). This gateway exchange routes a call to Network 1 of the country 1 where MS 1, where actual incoming calls should be made, is being served. In MSC 1, the MS 1 forwards the registered HLR 1 to the registered HLR 1 in the same manner as the general incoming call processing procedure (106).

As described above, the present invention can receive roaming service based on the number given by the service provider when registering the mobile phone service regardless of the mobile phone wireless access standard, number system, system standard, etc. of the country or region where the service subscriber is located. It is possible to service, and to implement international roaming service, it is possible to service by simple data operation without changing hardware or software on existing network components of mobile phone network. This can reduce the burden on the enormous development costs expected, save time, and prevent the deterioration of service quality.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings shown.

Claims (4)

Roaming service method between international mobile telephone network or heterogeneous mobile telephone network applied to general mobile telephone network, in which roaming service code, own phone number and password are translated and requested to register roaming service after receiving roaming service number. Registering a call transfer service with the location register unconditionally; A second step of requesting location information of the called party upon receiving an incoming call setting request and setting up a call path to the moved home location register when receiving a call forwarding number unconditionally by a called location information response message; And a third step of translating the roaming service code, its own phone number, and a password and unregistering the transfer service to the home location register before moving after receiving the calling terminal number. Roaming service method between the international mobile telephone network or heterogeneous mobile telephone network. The method of claim 1, wherein the first step, the MSC (Moblile Switching Center) receiving a roaming service code, its own number and password from the service subscriber who moved to another network translates the service code to interworking ISW Performing only a data operation to set an outgoing call by switching, and the ISW analyzes the incoming number and requests and receives a calling number from the calling station when the roaming service code is confirmed; When the ISW receiving the calling number requests activation of an international roaming service to an Interworking Location Register (IRL) in which information on a subscriber who has registered a roaming service is stored, the ILR uses the subscriber's own number and password received from the ISW. Verifying whether the service activation attempt subscriber is valid; When the verification of the validity of the subscriber is completed, the ILR sends a call transfer service registration request to the home location register before the service requesting subscriber using the MAP message; Receiving a service registration request before the home location register to activate the call transfer service unconditionally for the subscriber, and after the transfer the destination number to the call forwarding terminal registration number and transmitting a service registration response message to the ILR; And the ILR receiving the service registration response message transmits a roaming service registration response message to the ISW, and the ISW receiving the roaming service registration response message transmits a confirmation tone indicating that the service registration is completed to the calling party. Roaming service method between the international mobile telephone network or heterogeneous mobile telephone network. The method of claim 1, wherein the first step, the MSC (Moblile Switching Center) receiving the roaming service code, the number and the password to be received from the service subscriber who moved to the other network translates the service code to interworking switching Performing only a data operation so that the outgoing call can be set, and the ISW analyzes the incoming number and requests and receives a calling number from the calling station when the roaming service code is confirmed; When the ISW receiving the calling number requests activation of an international roaming service to an Interworking Location Register (IRL) in which information on a subscriber who has registered a roaming service is stored, the ILR uses the subscriber's own number and password received from the ISW. Verifying the validity of the service activation attempt subscriber and notifying the result to the ISW; When the validation of the subscriber is completed, the ISW sends a call transfer service registration request to the home location register before the service requesting subscriber using the MAP message; Receiving the service registration request before the home location register to activate the call transfer service unconditionally for the subscriber, and after the transfer the destination number of the terminal to the transfer destination number and transmits a service registration response message to the ISW; And receiving the roaming service registration response message and transmitting an acknowledgment signal indicating that the service registration has been completed to the calling party. The method of claim 1, wherein the second step further comprises: when the incoming call setting request is received in the idle state, requesting the location information of the called party to the home location register before the incoming subscriber is registered. step; If the roaming service is activated and the call transfer service is performed unconditionally, receiving a called location information response message and requesting a call setup to the called phone number included in the message; And establishing a call path to perform normal call processing. 2. A roaming service method between an international mobile telephone network or a heterogeneous mobile telephone network.