KR100810418B1 - System and method for charging for international roaming call based on msisdn in 3g mobile communication system, and apparatus therefor - Google Patents

Abstract

The present invention relates to a system and method for processing charging of a global roaming call of a third generation mobile communication system using an already established subscriber telephone number based charging system, and an apparatus therefor, the visited network in a third generation mobile communication system. A global roaming call billing system of a home network that processes billing for roaming calls of roaming subscribers who have moved to the network, receives billing information of the IMSI standard calculated by the visited network from the visited network for roaming calls of roaming subscribers, and A billing information converting apparatus for converting the received billing information based on the IMSI into billing information based on the subscriber's telephone number; And a charging device that calculates and charges the charge of the roaming subscriber based on the charging information based on the subscriber's phone number converted by the charging information conversion device.

WCDMA, Roaming, Billing, MSISDN, IMSI

Description

System and method for billing global roaming call based on subscriber's phone number in 3rd generation mobile communication system and apparatus therefor {SYSTEM AND METHOD FOR CHARGING FOR INTERNATIONAL ROAMING CALL BASED ON MSISDN IN

1 is a network diagram of a WCDMA mobile communication system supporting a global roaming service according to an embodiment of the present invention.

FIG. 2 is a functional configuration diagram of the global charging information converting apparatus of FIG. 1.

3 is a diagram illustrating an example of a relationship table between subscriber telephone number (MSISDN) and IMSI.

4 is a diagram showing another example of the relationship table between subscriber telephone number (MSISDN) and IMSI.

5 is a signal flow diagram illustrating a global roaming call charging method in a WCDMA mobile communication system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

141: receiving unit 142: database search unit

143: IMSI-subscriber telephone number mapping unit 144: transmitting unit

145: database

The present invention relates to a third generation mobile communication system, and more particularly, to global roaming call charging in a third generation mobile communication system.

Recently, with the rapid increase in mobile communication demand, global roaming service is being provided to the global market, free from the calls between domestic subscribers, and its subscribers and sales are also growing rapidly every year.

In Code Division Multiple Access (CDMA) and Global System for Mobile Communication (GSM) systems represented by 2nd generation mobile communication systems, global roaming service between CDMA providers is currently limited due to various frequency bands and unstandardized technical specifications. It is only limitedly used among operators operating the 800MHz frequency, and global roaming service between GSM operators is very active due to the standardized system, technical standards, and multi-branding of all terminals.

The global roaming service of the second generation mobile communication system uses an international mobile subscriber identity (IMSI), which is a globally unique subscriber identification number. IMSI is a globally unique 15-digit number assigned to a mobile communication terminal (or smart card) when subscribing to a mobile communication service and includes a mobile country code (MCC), a mobile network code (MNC) and a mobile station identification number (MSIN). It is configured by.

However, the domestic mobile communication service charges the mobile communication fee based on the mobile directory number (MDN) rather than IMSI. Therefore, in order for a domestic mobile subscriber to move to another country and use a global roaming service, a domestic roaming service provider must join a global roaming service and create a relationship between a subscriber's telephone number (MDN) and an IMSI of a rental terminal leased from another country. If a charge is calculated based on IMSI in another country using global roaming service, the domestic carrier will use the subscriber's telephone number (MDN) based on the subscriber's telephone number (MDN) and IMSI relationship. After converting to a base rate, the global roaming service subscriber will be charged.

Meanwhile, with the continuous development of mobile communication technology, a third generation mobile communication system using a wide code division multiple access (WCDMA) system capable of high-speed data transmission and multimedia transmission has been developed. In this 3rd generation mobile communication system, subscribers do not have to subscribe to a separate global roaming service, but have their own smart card (for example, Universal Subscriber Identity Module (USIM), terminal, and phone number, and have free global roaming service in all countries). Can be provided.

Like 2nd generation mobile communication system, 3rd generation mobile communication system provides global roaming service using IMSI. However, as described above, the third generation mobile communication system may freely use the global roaming service without a separate service subscription procedure. Therefore, domestic mobile carriers cannot create a relationship between subscriber's phone number and IMSI. Therefore, a problem arises in that a separate billing system is required to charge a fee based on IMSI. In this case, it takes a long time and excessive cost, and it acts as an obstacle for building 3G mobile communication system.

The present invention has been proposed to solve the above problems, and provides a system and method for processing charging of a global roaming call of a third generation mobile communication system using an already established subscriber telephone number based charging system and an apparatus therefor. The purpose is.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The present invention for achieving the above object is a global roaming call billing system of the home network for billing the roaming call of roaming subscribers moved to the visited network in the third generation mobile communication system, the visit to the roaming call of the roaming subscriber A billing information converting apparatus for receiving the billing information of the IMSI standard calculated by the network from the visited network and converting the received billing information of the IMSI standard into billing information of the subscriber's telephone number; And a charging device that calculates and charges the billing of the roaming subscriber based on the billing information based on the subscriber's telephone number converted by the billing information converting device.

Preferably, the billing information converting apparatus extracts a subscriber's phone number corresponding to the IMSI of the received billing information from the relationship table of the subscriber's phone number and the IMSI stored therein and maps it to the IMSI of the billing information. do.

In addition, the present invention, the billing information of the home network for converting the billing information of the IMSI standard calculated in the visited network to the billing information based on the subscriber's telephone number for roaming calls of roaming subscribers moved to the visited network in the third generation mobile communication system A conversion apparatus, comprising: receiving means for receiving charging information of an IMSI criterion calculated in the visited network; Storage means for storing a relationship table of subscriber telephone numbers and IMSI; Retrieving means for retrieving the subscriber's telephone number corresponding to the IMSI of the received charging information from the storage means; And mapping means for mapping the retrieved subscriber's telephone number to the IMSI of the received billing information.

The present invention also provides a global roaming call charging method for charging a roaming call of a roaming subscriber who has moved to a visited network in a third generation mobile communication system, comprising: (a) a roaming call of the roaming subscriber included in the visited network; Calculating charging information based on the IMSI; (b) receiving charging information of the IMSI criterion from the visited network in the home network; (c) converting the charging information based on the received IMSI into charging information based on the subscriber's telephone number; And (d) calculating and billing the billing of the roaming subscriber based on the billing information of the converted subscriber's telephone number basis.

Preferably, the step (c) comprises the steps of: extracting a subscriber's telephone number corresponding to the IMSI included in the charging information received in the (b) from the relationship between the subscriber's telephone number and the IMSI; And mapping the extracted subscriber's telephone number to the IMSI of the charging information received in the step (b).

Further, preferably, the relationship table between the subscriber's telephone number and the IMSI includes a first table linking the IMSI and the subscription contract number, and a second table linking the subscription contract number and the subscriber telephone number.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a network diagram of a WCDMA mobile communication system supporting a global roaming service according to an embodiment of the present invention. Global roaming service is a mobile communication service that can be used in both areas by interworking between systems when a mobile subscriber visits from one service area to another service area. The mobile communication network is called a visited network. Accordingly, as shown in FIG. 1, a WCDMA mobile communication system that provides a global roaming service may be divided into a home network 110a and a visited network 110b.

Referring to FIG. 1, the home network 110a and the visited network 110b include a base station Node B, 102a, 102b, a radio control station (RNC: Radio Network Controller, 103a, 103b), a switch (MSC: Mobile Switching Center, 104a, 104b, home location registers (HLRs) 105a, 105b, billing systems 106a, 106b, and global roaming gateways 107a, 107b that relay global roaming calls.

In addition, referring to FIG. 1, the WCDMA mobile communication system collects billing information for a global roaming call from the switches 104a and 104b of the home network 110a and the visited network 110b to collect the home network 110a and the visited network 110b. ), The global charging information collection system 130.

At this time, the billing system 106a of the home network 110a performs billing processing based on the subscriber's phone number, i.e., Mobile Station International ISDN Number (MSISDN), and the billing system 106b of the visited network 110b is based on IMSI. The billing process is performed. IMSI is a globally unique 15-digit number assigned to a mobile communication terminal (or smart card) when subscribing to a mobile communication service and includes a mobile country code (MCC), a mobile network code (MNC) and a mobile station identification number (MSIN). It is configured by. Global roaming service is provided using the IMSI in the third generation mobile communication system. Therefore, the home network 110a further includes a global billing information converting device 140 for converting the billing information based on the IMSI calculated by the visitor network 110b into billing information based on the subscriber's telephone number. In this case, the global charging information converting device 140 is described as being separately constructed from the charging system 106a of the home network 110a, but it is obvious that the global charging information converting apparatus 140 may be integrated and built into the charging system 106a of the home network 110a. .

The base stations 102a and 102b are controlled by the radio control stations 103a and 103b to transmit and receive radio signals, wireless channel encoding and decoding, signal strength and quality measurement, baseband signal processing, diversity, radio resource management, and self maintenance. Perform the function.

Radio control stations 103a and 103b control the base stations 102a and 102b, and assign and release radio channels for mobile terminals 101a and 101b, and control of mobile terminals 101a and 101b and base stations 102a and 102b. Transmit output control, intercell soft handoff and hard handoff determination, transcoding and vocoding, operation and maintenance functions for base stations 102a and 102b, and the like.

The home location registers 105a and 105b store and manage subscriber information, additional service information for each subscriber, and location information of the mobile terminal. In particular, the home location registers 105a and 105b store profile information of the calling and terminating terminals. This profile information includes the subscriber's telephone number (MSISDN), IMSI, subscribed additional service information, and the like.

The global roaming gateways 107a and 107b relay global roaming calls in the home network 110a and the visited network 110b. For example, when a subscriber of the home network 110a moves to the visited network 110b and makes a phone call to another subscriber located in the home network 110a, the outgoing call is made via the global roaming gateway 107b of the visited network 110b. It is delivered to the global roaming gateway 107a of the home network 110a, and the global roaming gateway 107a of the home network 110a transfers the forwarded outgoing call to the called terminal via the exchange 104a of the home network 110a.

The exchanges 104a and 104b provide an interface function with the radio control stations 103a and 103b, and provide exchange functions (interworking functions) between mobile subscribers and fixed network subscribers such as PSTN and ISDN. do. The exchanges 104a and 104b determine whether the originating call is a global roaming call or not based on the mobile country code (MCC) of the IMSI included in the originating call of the mobile communication terminal. When the subscriber of the home network 110a moves to the visited network 110b to use the global roaming service, the billing information of the subscriber is generated at the exchange 104b of the visited network 110b, and the subscriber of the visited network 110b is connected to the home network 110b. When moving to 110a and using the global roaming service, the charging information of the subscriber is generated at the exchange 104a of the home network 110a.

Accordingly, the exchange 104a of the home network 110a calculates billing information (eg, talk time) including IMSI for outgoing calls of subscribers who roam globally from the visited network 110b to the home network 110a. The global charging information collection system 130 is transmitted. Meanwhile, the exchange 104b of the visited network 110b calculates the billing information including the IMSI for the outgoing call of the subscriber who roams from the home network 110a to the visited network 110b. To send.

The global charging information collection system 130 transmits the global roaming call charging information collected from the exchange 104a of the home network 110a to the charging system 106b of the visited network 110b, and exchanges the exchanges of the visited network 110b with each other. The global roaming call charging information collected from 104b is transmitted to the global charging information converting device 140 of the home network 110a. Since the billing system 106a of the home network 110a performs billing processing based on subscriber's telephone number (MSISDN), billing processing cannot be performed upon receiving billing information based on IMSI. Therefore, the IMSI-based billing information calculated by the visited network 110b is converted into billing information based on the subscriber's telephone number (MSISDN) in the global billing information converting apparatus 140 and transmitted to the billing system 106a of the home network 110a. . Since the billing system 106a of the visited network 110b performs billing processing on an IMSI basis, billing processing may be performed on the billing information received from the global billing information collection system 130 immediately.

The global billing information conversion device 140 receives, stores and updates in real time the relationship table of the subscriber's telephone number (MSISDN) and IMSI from the customer information management system (not shown). That is, when a user subscribes to the third generation mobile communication service, the customer information management system generates a relationship table of IMSI assigned to the subscriber's telephone number (MSISDN) and the mobile communication terminal (or smart card), and the global billing information. The conversion device 140 receives and stores the relationship table and updates it in real time. The global billing information converting apparatus 140 converts the billing information based on the IMSI transmitted from the global billing information collection system 130 into billing information based on the subscriber's phone number with reference to the subscriber phone number and the IMSI relationship table.

That is, the subscriber's phone number corresponding to the IMSI of the billing information delivered from the global billing information collection system 130 is extracted from the relationship table between the subscriber's phone number and the IMSI, and the extracted subscriber's phone number is extracted from the global billing information collection system 130. It converts the billing information received from the IMSI into billing information based on the subscriber's telephone number. The billing information based on the subscriber's phone number converted as described above is transferred to the existing billing system 106a and settled according to the existing billing processing process and billed to the subscriber.

FIG. 2 is a functional configuration diagram of the global charging information converting apparatus of FIG. 1. As illustrated in FIG. 2, the global charging information converting apparatus 140 includes a receiving unit 141, a database searching unit 142, and an IMSI-subscriber telephone number mapping. A unit 143, a transmitter 144, and a database 145 are included.

First, the database 145 receives and stores a relationship table of subscriber telephone number (MSISDN) and IMSI from the customer information management system of the home network 110a.

FIG. 3 is a diagram illustrating an example of a relationship table between subscriber telephone number (MSISDN) and IMSI. As shown in FIG. 3, the relationship table between subscriber telephone number (MSISDN) and IMSI includes an IMSI field for storing an IMSI number. 301), an MSISDN field 302 for storing subscriber telephone number (MSISDN), an EFFECTIVE_DATE field 303 for storing relationship valid start date and time, and an EXPIRATION_DATE field 304 for storing relationship valid end date and time. The relationship table between the subscriber's telephone number and IMSI is generated when the mobile communication terminal is opened.

FIG. 4 is a diagram showing another example of a relationship table between subscriber telephone number (MSISDN) and IMSI. As shown in FIG. 4, the relationship table between subscriber telephone number and IMSI is a table in which an IMSI is connected to a subscription contract number (FIG. 4 (a)), it may be composed of a table (Fig. 4 (b)) linking the subscription number and the subscriber's telephone number. Here, the subscription contract number is a contract number concluded between the subscriber and the mobile communication provider when the mobile communication terminal is opened. If the subscriber changes his / her telephone number during the service subscription, the subscription contract number remains the same and only the subscriber's telephone number (MSISDN) is changed.

As shown in (a) of FIG. 4, a table in which an IMSI is associated with a subscription agreement number includes an IMSI field 401 for storing an IMSI number, a CONTRACT_NUM field 402 for storing a subscription agreement number, and a relationship validity start. An EFFECTIVE_DATE field 403 for storing the date and time and an EXPIRATION_DATE field 404 for storing the relationship valid end date and time.

In addition, as shown in (b) of FIG. 4, the table in which the subscription contract number and the subscriber telephone number are linked includes a CONTRACT_NUM field 405 for storing a subscription contract number and an MSISDN field 406 for storing a subscriber telephone number. ), An EFFECTIVE_DATE field 407 for storing the relationship valid start date and time, and an EXPIRATION_DATE field 408 for storing the relationship valid end date and time.

Meanwhile, the receiver 141 receives charging information based on the IMSI from the global charging information collecting system 130. The global billing information collection system 130 receives the billing information of the home network 110a subscriber roaming into the visited network 110b from the exchange 104b of the visited network 110b and transmits it to the global billing information converting device 140. . The exchange 104b of the visited network 110b recognizes that the call is a roaming call based on the IMSI recorded in the outgoing call of the subscriber who roams into the visited network 110b, and the billing information (eg, talk time) including the IMSI. Generate and transmit to the global billing information collection system 130. The receiver 141 receives the charging information including the IMSI from the global charging information collection system 130.

The database retrieval unit 142 extracts the subscriber's telephone number (MSISDN) corresponding to the IMSI from the database 145 using the IMSI of the charging information received through the receiving unit 141 as a key value. That is, the database searching unit 142 extracts the subscriber's telephone number corresponding to the IMSI of the received billing information by referring to the relationship table between the subscriber's telephone number and the IMSI stored in the database 145.

More specifically, when the relationship table of subscriber telephone number and IMSI as shown in FIG. 3 is stored in the database 145, the database search unit 142 finds the IMSI of the billing information in the table of FIG. Extract stored subscriber telephone number (MSISDN).

Alternatively, when the relationship table of subscriber telephone number and IMSI as shown in FIG. 4 is stored in the database 145, the database search unit 142 first finds the IMSI of the billing information in FIG. Extract subscription number. Then, in FIG. 4 (b), the extracted subscriber contract number is found and the subscriber's telephone number (MSISDN) is extracted.

The IMSI-subscriber telephone number mapping unit 143 maps the subscriber's telephone number (MSISDN) extracted from the database searching unit 142 to the IMSI of the charging information received through the receiving unit 141 to map the charging information based on the IMSI standard. Convert to billing information based on subscriber's telephone number (MSISDN).

Then, the transmitting unit 144 transmits the charging information based on the subscriber's telephone number converted by the IMSI subscriber telephone number embedding unit 143 to the charging system 106a of the home network 110a. The billing system 106a is a system for billing and billing based on a subscriber's phone number. The billing system 106a bills a bill based on billing information based on subscriber's phone number received from the transmitter 144 and bills the subscriber.

5 is a signal flow diagram illustrating a global roaming call charging method in a WCDMA mobile communication system according to an embodiment of the present invention, when a subscriber of a home network moves to a visited network and sends a global roaming call to another subscriber of a home network. Describe the process of charging for roaming calls.

In this case, an object of the present invention is billing for global roaming calls, and the global roaming call origination process in the WCDMA mobile communication system is obvious to those skilled in the art to which the present invention pertains. A detailed description of the process of originating the global roaming call is omitted.

As shown in FIG. 5, a subscriber who roams from the home network to the visited network first enters an international telephone identification number (for example, 001, 002, 00345, etc.), a country code, and a called party's telephone number in the calling terminal. A call is made with the subscriber (hereinafter referred to as the called party) (S501). At this time, the exchange of the visiting network recognizes that the calling subscriber is a subscriber of the home network and not a subscriber in the home based on the IMSI included in the calling call of the calling terminal.

Subsequently, the exchange of the visitor network generates the charging information based on the start date and the end date and time of the originating call (S502), and transmits the generated charging information to the global charging information collection system (S503). At this time, the billing information generated by the exchange in the visited network includes the IMSI to identify which billing information is the billing information.

The global billing information collecting system converts the billing information transmitted from the exchange of the visited network into the standard of the home network and transmits the billing information to the global billing information converting apparatus of the home network (S504). That is, the global billing information collection system recognizes that the billing information is billing information of the home network subscriber based on the country code among the IMSI included in the billing information transmitted from the exchange of the visited network and transmits it to the home network.

Next, the global billing information converting apparatus of the home network converts the billing information based on the IMSI standard transmitted from the global billing information collecting system into billing information based on the subscriber's telephone number (MSISDN) (S505). Since the billing system of the home network performs billing processing based on the subscriber's telephone number, the global billing information converting apparatus converts the billing information based on the subscriber's telephone number from the billing information based on the IMSI transmitted from the visited network.

More specifically, the global billing information converting apparatus extracts the subscriber's telephone number (MSISDN) corresponding to the IMSI of the billing information transmitted from the visited room from the subscriber's telephone number (MSISDN) stored in the internal database and the IMSI relationship table. The extracted subscriber telephone number (MSISDN) is mapped to the IMSI of the charging information transmitted from the visited network.

For example, when the relation table of subscriber telephone number (MSISDN) and IMSI as shown in FIG. 3 is stored in a database, the global billing information converting apparatus finds the IMSI of the billing information transmitted from the visited network in the table of FIG. The subscriber's telephone number (MSISDN) stored correspondingly is extracted. The extracted subscriber's telephone number (MSISDN) is mapped to IMSI of billing information transmitted from the visited network.

Alternatively, when the relationship table of subscriber telephone number (MSISDN) and IMSI as shown in FIG. 4 is stored in a database, the global billing information converting apparatus first determines the IMSI of the billing information transmitted from the visited network in FIG. Find and extract the corresponding subscription number. Then, in FIG. 4 (b), the extracted subscriber contract number is found and the subscriber's telephone number (MSISDN) is extracted. The extracted subscriber's telephone number (MSISDN) is mapped to IMSI of billing information transmitted from the visited network.

The billing information based on the subscriber's phone number converted by the global billing information converting device is transmitted to the billing system of the home network (S506), and the billing system of the home network is settled based on the billing information based on the subscriber's phone number to the corresponding subscriber. Claim (S507). As a result, instead of separately establishing a billing system that performs billing processing on an IMSI basis, the billing system established in an existing CDMA mobile communication system is used as it is for billing of global roaming calls of a WCDMA mobile communication system, thereby reducing the cost and cost of building a new system. You can save time.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

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 by the drawings.

The present invention as described above, by charging the global roaming call by utilizing the billing system based on the subscriber number used in the existing second generation mobile communication service when evolving from the second generation mobile communication service to the third generation mobile communication service. Therefore, there is an effect that can reduce the time and cost required to develop a separate equipment. As a result, the 3G mobile communication system can be more smoothly constructed to improve the quality of the mobile communication service.

Claims (11)

As a global roaming call billing system of a home network that handles roaming calls of roaming subscribers who have moved from a third generation mobile communication system to a visited network Receive the billing information based on the International Mobile Subscriber Identity (IMSI) based on the visited network for the roaming call of the roaming subscriber from the visited network, and use the received IMSI based billing information as the billing information based on the subscriber's telephone number. A charging information converting apparatus for converting; And And a billing device for calculating and billing the billing of the roaming subscriber based on billing information based on the subscriber's telephone number converted by the billing information converting device. The method of claim 1, The charging information conversion device, And extracting a subscriber's phone number corresponding to the IMSI of the received billing information from a relationship table of the subscriber's phone number and the IMSI stored therein and mapping the IMSI to the IMSI of the billing information based on the IMSI. The method of claim 2, The relationship table between the subscriber's telephone number and IMSI, A global roaming call billing system, comprising: a first table linking an IMSI and a subscription contract number; and a second table linking a subscription contract number and a subscriber telephone number. The method of claim 2 or 3, The relationship table between the subscriber's telephone number and IMSI, A global roaming call billing system, which is generated when a subscriber subscribes to a third generation mobile communication service. Claims [1] An apparatus for converting billing information of a home network, which converts billing information based on IMSI calculated from the visited network into billing information based on a subscriber's telephone number, for roaming calls of roaming subscribers moved to a visited network in a third generation mobile communication system. Receiving means for receiving charging information based on the IMSI standard calculated by the visited network; Storage means for storing a relationship table of subscriber telephone numbers and IMSI; Retrieving means for retrieving the subscriber's telephone number corresponding to the IMSI of the received charging information from the storage means; And And mapping means for mapping the retrieved subscriber's telephone number to the IMSI of the received billing information. The method of claim 5, The storage means, And a second table linking the IMSI and the subscription contract number, and a second table linking the subscription contract number and the subscriber telephone number. The method according to claim 5 or 6, The relationship table between the subscriber's telephone number and IMSI, Billing information conversion apparatus, characterized in that it is generated when the subscriber subscribes to the third generation mobile communication service. A global roaming call billing method for billing roaming calls of roaming subscribers moving from a home network to a visited network in a third generation mobile communication system, (a) calculating billing information based on the IMSI included in the roaming call of the roaming subscriber in the visited network; (b) receiving charging information of the IMSI criterion from the visited network in the home network; (c) converting the charging information based on the received IMSI into charging information based on the subscriber's telephone number; And (d) settlement and billing of the roaming subscriber's billing based on the billing information based on the converted subscriber's telephone number; and a global roaming call billing method. The method of claim 8, In step (c), Extracting a subscriber's telephone number corresponding to the IMSI included in the charging information received in step (b) from the relation table between the subscriber's telephone number and IMSI; And Mapping the extracted subscriber's telephone number to the IMSI of the charging information received in the step (b); and a global roaming call charging method. The method of claim 9, The relationship table between the subscriber's telephone number and IMSI, And a second table linking the IMSI and the subscription contract number, and a second table linking the subscription contract number and the subscriber telephone number. The method according to claim 9 or 10, The relationship table between the subscriber's telephone number and IMSI, A global roaming call billing method, which is generated when a subscriber subscribes to a third generation mobile communication service.

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