KR20010017852A - System and method of Global Roaming between IMT-2000 Systems with different specifications - Google Patents

Abstract

PURPOSE: A method and system for global roaming between international mobile telecommunications-2000(IMT-2000) systems having mutually different standards is provided to add interworking functions like an interworking mobile switching center(IMSC) and an interworking authentication center(IAC), and to absorb/convert a difference between standards of the IMT-2000 systems, so as to easily support the global roaming. CONSTITUTION: If a mobile subscriber of an European Telecommunications Standards Institute(ETSI) system(22) performs roaming to a Telecommunications Industry Association/Electronics Industry Association(TIA/EIA) system(21), a mobile station(MS) performs an authentication algorithm for the subscriber, and an authentication result value is transmitted to a base station(BS). The BS transmits the authentication result value and information related to location registration to a mobile switching center(MSC). The MSC transmits the authentication result value to a visitor location register(VLR) in order to decide whether the subscriber is appropriate. The VLR transmits the authentication result value to a TIA-interworking location register(ILR). The TIA-ILR transmits the authentication result value to an ETSI-interworking authentication center(IAC) of the ETSI system(22). The ETSI-IAC performs an authentication algorithm, an authentication key, and an authentication procedure of the TIA/EIA system(21). The ETSI-IAC of the ETSI system(22) compares the a result value of the authentication algorithm with the authentication result value from the TIA-ILR, to decide whether the subscriber is appropriate. A decided result is transmitted to the TIA-ILR. The TIA-ILR transmits the authentication decision result to the VLR. The VLR transmits the authentication decision to the MSC.

Description

System and method of Global Roaming between IMT-2000 Systems with different specifications}

The present invention is a global roaming between family groups (family groups adopt different standard specifications) of the next generation mobile communication system (hereinafter referred to as IMT-2000) which is the third generation mobile communication system (mobile subscribers move around the world) And a function for receiving a service).

As IMT-2000 is currently being designed and researched around the world, there has been no implementation yet. Currently, IMT-2000 is a study on stand-alone IMT-2000 system. There is little research on the interworking between families. In addition, although the interworking between the first generation and the second generation mobile communication systems has been implemented, the interworking between them was not the interworking between completely different standard standards, as mentioned in the present invention. Interrelationships between versions of standard specifications) In particular, the representative differences between the European and North American families of IMT-2000 systems are the certification schemes.

Accordingly, the present invention proposes a system structure for interworking between families of IMT-2000 systems of different standard standards, defines the function of system entities defined in a new structure, and processes a process for interworking between families of IMT-2000 systems. The purpose is to provide.

In addition, in order to interwork among these different standard standards, the standard standards of each family should be respected as much as possible. In other words, by adding only the interworking location register, interworking exchanger, and interworking certification center without changing the basic structure and standard of the system defined in each family, the differences between the two standards are absorbed and converted through them. The IMT-2000 system should be able to be developed and developed according to its own standard specification.

A system for global roaming between next-generation mobile communication systems of different standards according to the present invention for achieving the above object is a North American system consisting of a terminal, a base station, an exchange, a home location register, a visitor location register and an authentication center (TIA). / EIA system) and the European roaming system (ETSI system) for the global roaming, the interworking location register and the gateway exchanger that performs the role of the home location or visit location register and message conversion function And an interworking authentication center that accommodates an authentication system and an authentication algorithm of the counterpart system to authenticate an interworking exchanger and a mobile subscriber moving between the visited system and the home system.

In addition, the authentication method for global roaming between next-generation mobile communication systems of different standards in accordance with the present invention for achieving the above object, when the mobile subscriber of the home system roams to the visiting system, the terminal performs an authentication algorithm for the subscriber And transmitting the authentication result value to the base station to the base station for authentication. Receiving, by the base station, a location registration message from the terminal, transmitting the authentication result value and location registration related information included in the message to a location registration message to a switch; The exchange receiving the location registration message from the base station, transmitting a result of the authentication result in the authentication request message to the visited location register to perform an authentication procedure for determining whether the subscriber is legitimate before performing location registration; A fourth step of transmitting the authentication result message included in the message to the interworking location register of the visiting system by receiving the authentication request message from the switch; A fifth step of transmitting, by the interworking location register of the visited system, the authentication result value received from the visited location register to an interworking authentication center of the home system; An interworking authentication center of the home system performing a authentication algorithm, an authentication key, and an authentication procedure of the visiting system; An interworking authentication center of the home system performing an authentication algorithm of the visited system to determine the legitimacy of the subscriber by comparing the resultant result with the authentication result received from the interworking location register of the visited system; An eighth step of transmitting the determination result of the seventh step in an authentication request response message to an interworking location register of the visiting system; An interworking location register of the visiting system, in the ninth step of transmitting the authentication decision result received from the interworking authentication center of the home system to the visitor location register by putting the authentication request response message in the authentication request response message; And the tenth step of transmitting the authentication decision result received from the interworking location register of the visiting system to the exchange by putting the authentication decision result in the authentication request response message.

1 is a system structure diagram for roaming between next-generation mobile communication (IMT-2000) systems of different standards.

2 is a flowchart illustrating an authentication method between a TIA / EIA system and an ETSI system having different authentication schemes.

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

1 is a system structure diagram for roaming between IMT-2000 systems of different standards.

Portions 11 and 14 where the shadows are not shown in FIG. 1 are the original IMT-2000 systems of the respective families. That is, the North American system (TIA / EIA system) 1 and the European system (ETSI system) 2 are shown. These systems, with their respective systems, can provide services to mobile subscribers in their area. And these systems do not need a separate functional entity when interworking with IMT-2000 systems that have the same standards. In other words, when IMT-2000 systems using the same standard want to communicate with each other, it is possible to communicate by connecting related functional entities. For example, when system A and system B that use the same standard want to interoperate with each other, they communicate as if they were one system. That is, when the VLR of the A system wants to communicate with the HLR of the B system, the VLR of the A system can directly communicate with the HLR of the B system.

However, when attempting to interwork between the TIA / EIA system 1, which is a North American system using different standards, and the European ETSI system 2, direct communication is not possible. Therefore, in the present invention, when a mobile subscriber roams between mobile systems using these different standards, in particular, between a TIA / EIA system (1), which is a North American system, and an ETSI system (2), a European system, the mobile subscriber roams. I would like to suggest a solution.

To this end, the interworking function (interworking location register, interworking authentication center, interworking exchange) of the portions 12 and 13 in which the shadow of FIG. 1 is displayed is required. The shaded portions 12 and 13 of FIG. 1 are inter-systems using different standards proposed by the present invention, in particular the TIA / EIA system 1, which is a North American system, and an European ETSI system 2 Is a system function entity added for global roaming, and FIG. 1 is a system architecture diagram for such global roaming.

Referring to the interworking function of Figure 1 as follows.

An interworking location register (ILR) is recognized as the visitor's home location register (HLR) from the standpoint of the visited location register (VLR) of the visiting system. For example, when the mobile subscriber of the TIA / EIA system 1 roams to the ETSI system 2, the visited location register (VLR) of the ETSI system 2 corresponds to the visited mobile subscriber's home location register (HLR). The visitor location register (VLR) recognizes the interworking location register (ETSI-ILR) as the visitor's home location register (HLR) and requests the service profile of the mobile subscriber. Until this time, the ETSI system 2 communicates according to its own standard. However, since the standards used by the ETSI system 2 and the TIA / EIA system 1 are different from each other, the interworking location register (ETSI-ILR) is converted into a message that the TIA / EIA system 1 can recognize. The TIA / ILA of the TIA / EIA system 1 requests the subscriber's service profile. That is, the interworking locator IRL performs the role of the home locator HLR and the message conversion function.

On the other hand, the interworking locator IRL is recognized as the visited locator VLR of the visitor from the standpoint of the home locator HLR of the home system. For example, a subscriber who has moved from the interworking locator (ETSI-ILR) of the ETSI system 2 to the ETSI system 2 as described previously by the interworking locator (TIA-ILR) of the TIA / EIA system 1. When requested by the service profile of the subscriber, he requests a service profile from the home location register (HLR) of the TIA / EIA system 1, which is the subscriber's home system. In this case, the interworking location register and the home location register communicate with each other according to the standard of the TIA / EIA system 1. That is, the interworking locator IRL performs the role of the visited locator VLR.

An interworking exchange (IMSC) serves as a gateway exchange. However, the TIA / EIA system 1 and the ETSI system 2 use different routing numbers. Therefore, the interworking exchange (IMSC) not only serves as a switch for interworking between systems, but also needs to perform translation between two different routing numbers (TIA / EIA system uses TLDN and ETSI system uses MSRN). For example, when a subscriber in the ETSI system 2 wants to transfer a call to a subscriber in the ETSI system that has moved to the TIA / EIA system 1, the exchange to which the originating subscriber of the ETSI system 2 belongs is located in the home position. From the registrar (HLR), we know that the called party has moved to the TIA / EIA system (1). Since the TIA / EIA system (1) and the ETSI system (2) use different routing numbers, they directly use the TIA / EIA. It is not possible to route a call to the destination exchange of system 1. That is, the originating exchange routes a call to the interworking exchange (ETSI-IMSC), and the interworking exchange (ETSI-IMSC) routes to the interworking exchange (TIA-IMSC) of the TIA / EIA system (1). Through the interworking exchange (TIA-IMSC), the call is routed to the destination exchange according to the routing number in the TIA / EIA system 1. At this time, the functional entities of the ETSI system 2 and the TIA / EIA system 1 communicate according to their own standards.

The interworking authentication center (IAC) of the home system is recognized as the visitor's authentication center (AC) from the standpoint of the interworking locator of the visiting system. The US and European systems have completely different authentication systems, which can be solved by accommodating the authentication system and authentication algorithm of the counterpart system in the interworking authentication center. In addition, since the two systems have a completely different authentication system, the terminal must be made of a dual mode terminal that accepts both types of authentication algorithms and authentication procedures, or a terminal capable of using a dual mode smart card.

FIG. 2 is a flowchart illustrating an authentication method between a TIA / EIA system and an ETSI system having such a different authentication scheme. FIG. The steps are as follows.

In the first step, when the mobile subscriber of the ETSI system 22 roams to the TIA / EIA system 21, the subscriber registers a location with the TIA / EIA system 21. The necessary information is an authentication procedure. The authentication procedure described here is also required for the outgoing call and the incoming call attempt. However, as described above, the terminal MS performs the authentication algorithm of the TIA / EIA system 21 because the terminal accepts the dual mode authentication procedure. Then, the result value (AUTHR) is put in the registration request (registration request) and transmitted to the base station (BS).

In the second step, when the base station BS receives the location registration message from the terminal MS, the base station BS transmits the authentication result value (AUTHR) and the location registration related information in the location update message to the exchange MSC. Done.

In the third step, when the MSC receives the location registration message from the base station BS, it performs the authentication procedure to determine whether the subscriber is legitimate and requests the location registration only if it is legal. Therefore, the exchange MSC sends the authentication result value AUTHR received from the base station BS in the authentication request message to the visitor locator VLR.

In the fourth step, when the visitor locator (VLR) receives the authentication request message from the switching center (MSC), the authentication result message (AUTHR) included in the message is loaded into the authentication request message to interwork the TIA / EIA system 21. Send to location register (TIA-ILR).

The fifth step, however, is whether the mobile subscriber is legitimate or not, because the home system to which the subscriber belongs should be judged. Therefore, the interworking locator (TIA-ILR) of the TIA / EIA system sends the authentication result value (AUTHR) received from the visiting locator to the authentication request message and transmits it to the interworking authentication center (ETSI-IAC) of the ETSI system. do.

In the sixth step, the interworking authentication center (ETSI-IAC) of the ETSI system 22 should accept the authentication algorithm, authentication key, and authentication procedure of the TIA / EIA system. Thus, the interworking authentication center executes the authentication algorithm of the TIA / EIA system 21 to obtain the result (AUTHR) obtained from the TIA / EIA system 21 and the authentication result value (AUTHR) received from the interworking location register (TIA-ILR) of the TIA / EIA system 21. ) To determine the legitimacy of the subscriber. The result of the determination is transmitted in an authentication request response message to an interworking location register (TIA-ILR) of the TIA / EIA system.

In step 7, the interworking location register (TIA-ILR) of the TIA / EIA system 21 receives the authentication decision result received from the interworking authentication center (ETSI-IAC) of the ETSI system 22. And send it to the visitor locator.

In the eighth step, the visitor locator registers the authentication decision result received from the interworking locator (TIA-ILR) of the TIA / EIA system 21 in an authentication request response message and transmits the result to the exchange. At this point, the authentication procedure ends and the exchange performs the location registration procedure.

As mentioned earlier, the terminal must be made as a terminal capable of using both a dual mode terminal or a dual mode smart card because the two systems use different standards.

The present invention described above can be variously substituted, modified and changed within the scope without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains and the accompanying drawings. It is not limited to.

In the present invention, the mobile subscriber can freely move between IMT-2000 systems that use different standard standards around the world, and receive the desired service regardless of time and place, and also use systems that use different standard standards. While interworking, each system can easily support global roaming by adding only the interworking function proposed in the present invention without changing its standard. In addition, authentication processing which is very important in mobile systems is also possible between systems having different authentication systems.

Claims (6)

In a system for global roaming between a North American system (TIA / EIA system) and an European system (ETSI system) consisting of a terminal, a base station, an exchange, a home location register, a visitor location register, and an authentication center, An interworking location register that performs a role and a message conversion function of a home location register and a visitor location register; An interworking exchange acting as a gateway exchange, A system for global roaming between next-generation mobile communication systems of different specifications, comprising an interworking authentication center that accommodates an authentication system and an authentication algorithm of a counterpart system to authenticate mobile subscribers moving between the two systems. . The method of claim 1, The interworking location register is a system for global roaming between next-generation mobile communication systems of different specifications, characterized in that it performs the role of the home location register of the visited mobile subscriber and the message conversion function from the perspective of the visited location register of the visited system. . The method of claim 1, The interworking location register is a system for global roaming between next-generation mobile communication systems of different specifications, characterized in that it performs the role and message conversion function of the visited location subscriber of the visited mobile subscriber from the standpoint of the home location register of the home system. . The method of claim 1, And said interworking exchange performs a role of a gateway exchange and a message conversion function. The system for global roaming between next-generation mobile communication systems of different specifications. The method of claim 1, The interworking authentication center is a system for global roaming between next-generation mobile communication systems of different specifications, characterized in that the role of the authentication center of the visiting mobile subscriber from the standpoint of the interworking location register of the visiting system. When the mobile subscriber of the home system roams to the visited system, the terminal performs an authentication algorithm for the subscriber and transmits the authentication result to the base station in a location registration message for authentication; Receiving, by the base station, a location registration message from the terminal, transmitting the authentication result value and location registration related information carried in the message to a location registration message to a switch; The exchange receiving the location registration message from the base station, sending an authentication result to the visited location register to perform an authentication procedure for determining whether the subscriber is legitimate before performing location registration; The visited location register receiving the authentication request message from the exchange, transmitting the authentication result value included in the message to the authentication request message and transmitting the authentication result message to the interworking location register of the visited system; The interworking location register of the visited system, transmitting the authentication result value received from the visited location register in an authentication request message to the interworking authentication center of the home system; The interworking authentication center of the home system performing an authentication algorithm, an authentication key, and an authentication procedure of the visiting system; The interworking authentication center of the home system performing an authentication algorithm of the visited system to determine the legitimacy of the subscriber by comparing the resultant result with the authentication result received from the interworking location register of the visited system; Transmitting the determination result to an authentication request response message and transmitting the result to the interworking location register of the visiting system; The interworking location register of the visiting system includes an authentication decision result received from the interworking authentication center of the home system in an authentication request response message and transmitted to the visitor location register; And The visitor location register includes a step of transmitting the authentication decision result received from the interworking location register of the visited system to the exchange by putting the authentication request response message in the authentication request response message. Authentication method.