KR20110136343A - System and method for roaming service of portable terminal, and service server - Google Patents

Abstract

PURPOSE: A system and method for roaming service of portable terminal and a service server is provided to control the location registration of a terminal by checking the location registration requesting network for performing international roaming service. CONSTITUTION: A server control unit(25) compares an actual traffic distribution value about a visit network which request the location registration and establishment distribution value about the business owner portion information with the reference to the subscription information of the mobile terminal through a server interface unit(21). If the actual traffic distribution value is larger than the corresponding visiting network, the server controller transmits a roaming prohibition message to the gateway location register.

Description

Roaming service system and method of a mobile terminal, and a service server thereof {System and method for roaming service of portable terminal, and service server}

The present invention relates to a roaming service system and method of a mobile terminal, and in particular, to provide a roaming service system of a mobile terminal capable of controlling the traffic ratio between a plurality of operators of the corresponding country by controlling the location registration of the mobile terminal roaming overseas when providing an international roaming service And a service server thereof.

In addition to the simple voice call function, the mobile communication terminal has been expanded to a multimedia terminal such as a digital camera photographing or an MP3 music file with a built-in camera or a memory. The service of the communication terminal is not only provided with a communication service for a voice call, but various additional services using multimedia functions newly added to the mobile communication terminal have been developed.

Meanwhile, an international roaming service is provided by using such a mobile terminal, which is a service provided between countries having the same technology scheme (for example, CDMA, WCDMA, etc.) and using the same frequency band. By using the terminal and the telephone number used, it is possible to provide communication services in other countries.

The mobile communication terminal performing the international roaming service stores public land mobile network (PLMN) information subscribed to the subscriber and PLMN information last used by the communication terminal in the universal subscriber identity module (USIM). When the power is turned on, the system acquires the system information message using the frequency of the maximum reception strength, extracts the PLMN information from the system information message, compares the extracted PLMN information with the last used PLMN information, and recognizes it as international roaming. Then, by performing the registration process for the base station of the adjacent cell using the extracted PLMN information, the international roaming service is provided.

Recently, when a mobile operator requests an international roaming service from a mobile operator abroad, there is a need for a technology that can control roaming traffic of a mobile carrier customer in a country where roaming is requested. It is rising, and this is called traffic steering.

However, in the conventional international roaming service, the traffic steering technology is a roaming gateway device of a home network when a mobile communication terminal requesting location registration to receive roaming service from abroad does not request location registration via a preferred network (PLMN). The gateway location register (GLR) rejects the location registration of the terminal of the corresponding mobile communication and repeats the process of inducing the mobile communication terminal to perform the registration procedure through the network of another service provider. It is not easy to maintain it, and also has a disadvantage in that it is not easy to reflect this in the mobile communication terminal when the traffic allocation ratio between a plurality of overseas operators is changed.

The present invention has been proposed in order to solve the above-mentioned problems, and checks the network for requesting location registration for international roaming service, and controls the location registration of the mobile terminal to control the traffic ratio between multiple operators in the corresponding country. An object of the present invention is to provide a roaming service system and method for a portable terminal, and a service server thereof.

The roaming service system of the portable terminal of the present invention for achieving the above object, receives the international roaming request from the portable terminal, and transmits the subscriber information of the portable terminal, when receiving a roaming disallowed message, the location registration failure message to the portable terminal The actual traffic distribution ratio value for the visited network requested by the mobile terminal for location registration and the setting ratio value of the provider portion information for the visited network, with reference to subscriber information received from the gateway location register to be transmitted and the gateway location register. And compares the service traffic ratio to the gateway location register when the actual traffic distribution ratio value for the visited network is greater than the set ratio value for the visited network.

The service server in the roaming service system of the mobile terminal of the present invention for achieving the above object, the server interface unit for transmitting and receiving data to the gateway location register, the actual traffic distribution ratio value and operator portion information for a plurality of visited network The actual traffic distribution ratio value and the corresponding visit for the visited network requested by the mobile terminal for location registration by referring to the subscriber information of the mobile terminal for receiving the international roaming service received from the gateway location register through the server storage unit and the server interface to store The server control unit which compares the set ratio value of the carrier portion information for the network, and transmits a roaming disallowed message to the gateway location register when the actual traffic distribution ratio value for the visited network is larger than the set ratio value for the visited network. Include.

In the service server in the roaming service system of the portable terminal of the present invention, the server control unit compares the setting ratio value of the operator portion information with respect to the plurality of visited networks in the area where the portable terminal requests the location registration and the actual traffic distribution ratio value. Characterized in that.

In the service server in the roaming service system of the portable terminal of the present invention, the server control unit, the landing network requesting the location registration of the portable terminal is the difference between the set ratio value and the actual traffic distribution ratio value among the plurality of visiting networks in the region If it is not the largest visitor network, the roaming disallowed message is transmitted to the gateway location register.

In the service server in the roaming service system of the portable terminal of the present invention, the server control unit, when the visited network to which the portable terminal requests location registration is FPLMN (Forbidden Public Land Mobile Network), the roaming disallowed message to the gateway location register Characterized in that the transmission.

In a service server in a roaming service system of a portable terminal of the present invention, the server interface unit has an interface for data transmission and reception with an over-the-air (OTA) server, and the server storage unit further stores a PLMN list.

In the service server in the roaming service system of the portable terminal of the present invention, the server controller extracts a PLMN list corresponding to the subscriber information and sets the first PLMN of the extracted PLMN list in the region where the portable terminal requests location registration. It is characterized in that the difference value obtained by subtracting the actual traffic distribution ratio value from the ratio value is set as the largest visited network, and the set PLMN list is transmitted to the OTA server through the server interface unit.

 In the service server in the roaming service system of the mobile terminal of the present invention, the server storage unit is characterized in that further stores the PLMN list and user personal information.

In the service server in the roaming service system of the portable terminal of the present invention, the server controller extracts the PLMN list corresponding to the subscriber information, sets the priority of the extracted PLMN list by referring to the user personal information, and then sets the PLMN. The list is transmitted to the OTA server through the server interface.

In a service server in a roaming service system of a mobile terminal of the present invention, the server storage unit is further configured to store the visited network service information.

In the service server in the roaming service system of the portable terminal of the present invention, the server controller transmits the visited network service information to the OTA server through the server interface unit together with the set PLMN list.

In a service server in a roaming service system of a mobile terminal of the present invention, subscriber information includes a subscriber identification number, a country code, and a provider code.

The service server in the roaming service system of the portable terminal of the present invention is characterized in that it further comprises a server transmitting and receiving unit for transmitting and receiving data with the manager terminal.

In a service server in a roaming service system of a portable terminal of the present invention, the server control unit may receive and store operator portion information for a plurality of visited networks from a manager terminal through a server transmission and reception unit.

In the service server in the roaming service system of the portable terminal of the present invention, the provider portion information applies a plurality of country identification information abroad, a plurality of service provider identification information providing an international roaming service abroad, a setting ratio value and a setting ratio value. Characterized in that it comprises period information.

In the roaming service method of the mobile terminal of the present invention for achieving the above object, the service server, the receiving step of receiving the subscriber information of the mobile terminal for receiving the international roaming service from the gateway location register, the service server received the subscriber The comparison step of comparing the actual traffic distribution ratio value for the visited network to which the mobile terminal has requested location registration with the information and the set ratio value of the provider portion information for the visited network with reference to the information, and the service server, the actual traffic for the visited network If the distribution ratio value is larger than the set ratio value for the visited network, a first transmission step of transmitting a roaming disallowed message to the portable terminal through the gateway location register.

In the roaming service method of a portable terminal of the present invention, the comparing step may be performed by comparing a setting ratio value of service provider portion information with respect to a plurality of visited networks in a region in which the portable terminal requests location registration, and an actual traffic distribution ratio value. do.

In the roaming service method of a portable terminal of the present invention, the first transmission step includes a difference between a setting rate value and an actual traffic distribution ratio value among a plurality of visiting networks in a region where the service server requests the mobile terminal to register a location. If is not the largest visiting network, characterized in that the roaming disallowed message to the gateway location register.

The roaming service method of the mobile terminal according to the present invention includes a third transmission step of transmitting, by the service server, a roaming disallowed message to the gateway location register when the visited network to which the mobile terminal requests location registration is FPLMN after the reception step. It further comprises.

In the roaming service method of the mobile terminal of the present invention, after the first transmission step, the service server extracts the PLMN list corresponding to the subscriber information, and the first PLMN of the extracted PLMN list is located in the region where the mobile terminal requests location registration. And a setting step of setting the visited network having the largest difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio value.

In the roaming service method of the mobile terminal of the present invention, after the first transmission step, the service server extracts a PLMN list corresponding to subscriber information, and sets a priority of the extracted PLMN list with reference to user personal information. It characterized in that it further comprises.

The roaming service method of the mobile terminal according to the present invention may further include a list transmission step of transmitting, after the setting step, the PLMN list set by the service server to the OTA server.

In the roaming service method of the mobile terminal of the present invention, the list transmission step is characterized in that the service server transmits the visited network service information together with the set PLMN list.

According to the present invention, when an international roaming request of a mobile terminal is performed, the number of mobile terminals roaming for each of a plurality of operators in a corresponding country is determined in real time, and the mobile terminal is considered in consideration of a difference value between an operator's allocated traffic ratio and a ratio distributed in real time. By controlling the location registration request of the, it is possible to adjust the traffic allocation ratio between a plurality of overseas operators.

In addition, by transmitting a PLMN list that sets the priority according to the traffic allocation ratio of a plurality of overseas operators to the mobile terminal, it is possible to increase the convenience of the user by inducing a connection to a specific visited network without repeatedly performing a location registration procedure. Can be.

In addition, in case of network failure of an overseas operator, it is possible to provide a stable service to the nationals who are roaming abroad by inducing other operators to use the network through steering.

In addition, by controlling the roaming service in conjunction with the customer database, it can be promoted to provide better benefits to the customer.

1 is a block diagram showing a roaming service system of a mobile terminal according to an embodiment of the present invention.
2 is a block diagram showing a TCP / IP interface protocol message configuration for subscriber information transmitted from a gateway location register to a service server according to an embodiment of the present invention.
3 is a diagram illustrating a PLMN list according to an embodiment of the present invention.
4 is a diagram illustrating a screen for setting operator portion information in a service server in a manager terminal according to an embodiment of the present invention. .
5 is a diagram illustrating a screen on which status information of an international roaming service is output according to an exemplary embodiment of the present invention.
6 is a block diagram showing a service server according to an embodiment of the present invention.
7 is a configuration diagram illustrating a roaming sub table according to another embodiment of the present invention.
8 is a flowchart illustrating a roaming service method of a mobile terminal according to an embodiment of the present invention.
9 is a flowchart illustrating a roaming service method of a mobile terminal according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings.

In the present specification, when one component 'transmits' data or a signal to another component, it may directly transmit data or a signal, and may transmit data or a signal through at least one other component. it means.

1 is a block diagram showing a roaming service system of a mobile terminal according to an embodiment of the present invention.

Referring to FIG. 1, a roaming service system of a mobile terminal according to the present invention includes a mobile terminal 11, a visitor network 13, a home location register (HLR) 17, a gateway location register 19, and the like. It is configured to include a service server 20, and may further include a UCMS (USIM Card Management System) server 31, OTA (Over The Air) server 33 and the administrator terminal.

The portable terminal 11 includes a USIM and is a portable terminal capable of wireless mobile communication such as a mobile phone and a personal digital assistant (PDA). In addition, the mobile terminal 11 may be a general wireless terminal capable of uploading and downloading packets as well as voice calls.

The mobile terminal 11 according to the present embodiment transmits a request signal to a visited network 13 when receiving an international roaming service from abroad, and receives a roaming rejection message for a roaming request. Roaming request signal will be retransmitted.

In addition, if a message including a PLMN list is received from the visited network 13, the message may be delivered to the USIM. Here, the USIM is a general-purpose subscriber identification module, and may store information of a mobile terminal 11 user, such as a carrier information, a user password, roaming information, a phone number of the mobile terminal 11, and the like for the purpose of authenticating the user. The PLMN list transmitted through 13 may be stored in the internal memory.

The visited network 13 serves to ensure the mobility of the mobile terminal 11, and includes a base station, a base station controller and a switch, and supports both synchronous and asynchronous. In addition, the visited network 13 is not limited thereto, and may include a communication network of all mobile communication systems to be implemented in the future, including a CDMA network, a GSM network other than a W-CDMA network, and a fourth generation.

Here, in the case of a synchronous wireless communication network, a base station that receives and transmits a wireless communication signal of the mobile terminal 11 controls a base transceiver station (BTS) and a base station controller that performs communication with a switch and a base station controller (BSC). In the case of an asynchronous wireless communication network, a base station that receives and transmits a radio communication signal of the mobile terminal 11 controls a Node B and a Node B, and a base station controller that communicates with a switch is an RNC. (Radio Network Controller).

In addition, the exchange is a general mobile communication exchange and forms an access point for user traffic with other exchanges. That is, the exchange performs call processing, basic and additional service processing, location registration and handover procedure processing of the mobile terminal 11, interworking with other networks, and performs an ASS (Access) function to perform distributed call processing. Switching Subsystem (INS), Interconnection Network Subsystem (INS) to perform centralized call processing, Central Control Subsystem (CCS) to centralize operation and maintenance, and LRS (Storage and Management of Mobile Subscribers) Location Registration Subsystem).

When the visiting network 13 of the present embodiment receives an overseas roaming request signal from the mobile terminal 11, the visitor network 13 requests the gateway location register 19 to register the location of the mobile terminal 11, and thus, from the gateway location register 19. When receiving the location registration failure message or the location registration completion message for the visited network 13 of the mobile terminal 11, it transmits to the mobile terminal (11).

In addition, when receiving a forwardSM message (FSM) including a PLMN list from the gateway location register (19), the short message service center (SMSC; not shown) in conjunction with the short message including the corresponding PLMN list After generating, the short message may be transmitted to the mobile terminal 11.

The home location register 17 stores subscriber terminal information, subscription information, and the like, and receives location information to perform registration recognition, registration deletion, location confirmation, and authentication. In addition, the home location register 17 may include a subscriber information management device that manages a database of additional service information of a subscriber when implemented in a wired communication service. The home location register 17 for the mobile communication service and the subscriber information management device for the wired communication service perform a function of making a database of additional service information of the subscriber. The home location register 17 of the present embodiment receives a location registration message from the gateway location register 19 and transmits corresponding International Subscriber Dialing (ISD) information to the gateway location register 19.

The gateway location register 19 includes a gateway location register (GLR), a roaming traffic direction (RTD), and the like, and is responsible for call call connection and transmission and reception of various data for international roaming services. It performs Signaling Conversion, MAP Protocol Conversion, Subscriber ID and Supplementary Service Mapping to provide international roaming service with overseas telecommunications carrier network. At this time, RTD is a technique for restricting the registration of operators that are not affiliated with an operator.When roaming to a specific country, the affiliated communication is requested when the network registration request of an unaffiliated service provider is requested, not a communication network of an affiliated service provider. Until roaming into a communication network of a service provider, a function of disallowing registration of a communication network of a non-affiliated communication service provider may be performed.

In this case, the GLR of the gateway location register 19 uses a TCP / IP socket connection, operates as a server between the service server 20, and the service server 20 operates as a client. Provide port number for IP socket connection.

When the location registration of the mobile terminal 11 is requested from the visited network 13, the gateway location register 19 of the present embodiment sends the subscriber information of the mobile terminal 11 requesting location registration to the service server 20 from abroad. send. In this case, the gateway location register 19 may extract subscriber information by referring to a location registration request message (UP) received from the mobile terminal 11 through the visit network 13 and transmit the subscriber information to the service server 20. have. For example, it may be checked in Global Title (GT) information of the location registration request message. The global title information is address information used in a signaling connection control part (SCCP) protocol for routing signaling messages and is an identification code uniquely set for each communication network of each operator. More specifically, the global title information is formed by combining a code representing a country and a code representing a corresponding visit network.

In addition, if the roaming disallowed message for the mobile terminal 11 is received from the service server 20, the mobile station 11 transmits a location registration failure message such as 'UL NACK' to the mobile terminal 11 through the visit network 13. . On the other hand, when receiving the roaming permission message for the mobile terminal 11 from the service server 20 transmits the location registration message to the home location register 17, and thus receives the ISD information transmitted from the home location register 17 The subscriber information (for example, IMSI / MSISDN Pair) of the mobile terminal 11 is registered and managed.

2 is a block diagram illustrating a TCP / IP interface protocol message configuration for subscriber information transmitted from the gateway location register 19 to the service server 20 according to an embodiment of the present invention. Referring to FIG. The subscriber information between the GLR of the gateway location register 19 and the service server 20 is composed of a message header and a message body.

The message header is a control message such as 'message version ID' indicating the version of the message format currently used, 'Linked ID' which is an unsigned integer variable, connection, release, check and report as shown. Or a node that transmits and receives a message to distinguish a system that provides a mobile communication service by a function of 'message type', an unsigned integer variable, 'service ID', an unsigned integer variable, and a function for identifying a service request and response message. 'Subsystem' to identify the node), 'Operation Code' to identify the message type, 'Prefix' and 'NPA', which are unsigned integer values, and the number assigned to each message, and 'Context ID' which is an unsigned integer variable. , The "Source ID" representing the system sending the message, the "Time Stamp", an unsigned integer variable representing the system time in seconds that invoked the message, and the message. Recorded and a "Message Length" of an unsigned integer type variable containing the length of the body region.

The message body is 'UserID', which is the subscriber's identification number, 'CC', which is a country code (Country Code) of the region where the mobile terminal 11 requests location registration, and a visited network where the mobile terminal 11 requests location registration. (13) may include a 'VC' which is a Vendor Code for the operator operating, wherein 'CC' or 'VC' is provided as a VLR number or a Serving GPRS Supporting Node (SGSN) number, 'UserID' may be provided as MSISDN information, but is not limited thereto.

In particular, the 'Message Type' is used together with the 'Operation Code' when transmitting a message from the gateway location register 19 to the service server 20, and the subscriber overseas roaming registration, subscriber overseas roaming deletion, etc. in the service server 20 This 'Operation Code' is used to update subscriber information in case of overseas roaming registration and overseas roaming deletion. Here, the items of 'Linked ID', 'Service ID', 'Prefix' and 'NPA' may not be included in the message transmitted between the gateway location register 19 and the service server 20.

In addition, the gateway location register 19 performs a roaming function to another communication network by interworking with a signal roaming network for interworking a communication service between an arbitrary communication network and another communication network, for example, a signaling transfer point (STP). It is possible to perform call call connection and transmission and reception of various data during the incoming exchange period.

The service server 20 stores carrier portion information for a plurality of overseas visited networks 13, receives subscriber information of the mobile terminal 11 transmitted from the gateway location register 19, and receives overseas information. The server determines whether to allow roaming of the mobile terminal 11 by comparing actual traffic distribution ratio values with respect to the plurality of visited networks 13 and operator portion information.

The actual traffic distribution ratio value is the number of mobile terminals 11 roaming service in a particular area, when there are a plurality of providers that provide roaming service in a particular area of a foreign country. 13 is a ratio value with respect to the number of the mobile terminals 11 provided with the roaming service.

The provider portion information is information representing a portion previously allocated to the roaming traffic to a plurality of operators operating the overseas visit network 13. In this case, the provider portion information includes 'Policy', which is an identification item of each policy, 'Country', which is an identification item for a plurality of countries abroad, 'Vendor', which is an operator identification item that provides international roaming service in a corresponding country, and a plurality of operators. It may include a 'setting rate value' to which the traffic is allocated to the visited network 13 operated by the 'setting rate value', and a term indicating 'period' to apply the setting rate value. At this time, although the mobile terminal 11 requests roaming from overseas, the region is divided into countries. However, when the same operator operates the visited network 13 between neighboring countries, the same PLMN list may be used. It can be divided into groups by country.

More specifically, when the service server 20 receives the subscriber information from the gateway location register 19, the service server 20 checks the country and the visited network 13 to which the mobile terminal 11 requests the location registration in the subscriber information, and the mobile terminal. (11) compares the actual traffic distribution ratio value for the visited network 13 requesting the location registration with the set ratio value for the visited network 13 included in the provider portion information. The service server 20 transmits a roaming disallowed message to the gateway location register 19 when the actual traffic distribution ratio value for the visited network 13 is greater than the set ratio value for the visited network 13.

As described above, the gateway location register 19 receiving the roaming disallowed message transmits a location registration failure message to the mobile terminal 11 through the visit network 13, and then the mobile terminal 11 transmits another visited network ( 13) to request location registration, and through the above process it is possible to maintain a constant traffic setting rate value for each operator in the country.

In another embodiment of the present invention, the service server 20 roams to the gateway location register 19 when the actual traffic distribution rate value for the visited network 13 is greater than the set rate value for the visited network 13. After transmitting the disallowed message, the PLMN list corresponding to the subscriber information of the mobile terminal 11 is extracted, and the actual traffic distribution ratio is calculated from the traffic setting ratio value in the country where the mobile terminal 11 requests location registration. The difference value minus the value may be set to the largest visited network 13.

As such, the mobile terminal 11 sets the highest priority in the first PLMN, that is, the PLMN list, to the visited network 13 having the largest difference between the traffic setting rate value and the actual traffic distribution rate value in the country requesting location registration. Since the mobile terminal 11 receives the roaming using the first PLMN, roaming traffic of the mobile terminal 11 can be more efficiently controlled.

The PLMN list represents a list for the visited network 13 to which the mobile terminal 11 can receive roaming service overseas.

3 is a configuration diagram illustrating a PLMN list according to an embodiment of the present invention. Referring to FIG. 3, the PLMN list includes a group ID 'GroupID', which is a PLMN list group identification item that matches a plurality of countries or country groups, and a group. The name 'GroupName', the number of registered PLMN lists, 'PLMN_NUM', the Mobile Country Code (MCC) + Mobile Network Code (MNC) of the first PLMN, 'PLMNXXX' and the Access Technology Identifier (ATI) of the first PLMN. It may include 'PLMNXXXATI'. That is, the service server 20 is the difference between the 'PLMNXXX' and 'PLMNXXXATI' items in the PLMN list by subtracting the actual traffic distribution ratio value from the traffic setting ratio value in the country where the mobile terminal 11 requests location registration. The information on the large visited network 13 is changed and set.

Thereafter, the service server 20 may transmit the newly set PLMN list to the OTA server 33. At this time, the service server 20 may format the data in an APDU (Application Protocol Data Unit) format for data communication with the USIM module, and transmit the data to the OTA server 33. Also, when the data is formatted, the UCMS server ( In step 31), the card key of the USIM card may be inquired and data formatting may be performed using a security policy (SP) method.

The UCMS server 31 stores USIM profile information such as subscriber's International Mobile Subscriber Identify (IMSI), terminal identification information such as Mobile Station International ISDN Number (MSISDN), and transmits the USIM profile to the service server 20. Perform the function of synchronizing.

The OTA server 33 performs an SMS format to transmit the PLMN list received from the service server 20 to the mobile terminal 11 in an SMS manner, and then visits a ForwardSM message (FSM) message including the PLMN list. To the network 13.

Thereafter, when the mobile terminal 11 requests the location registration again, the mobile terminal 11 may perform the location registration process using the PLMN list received from the OTA server 33 through the visit network 13. Specifically, the mobile terminal 11 extracts PLMN information from the system information message obtained from the base station of the neighbor cell, and if the extracted PLMN information matches the received PLMN list, the mobile terminal 11 performs a registration process for the base station of the cell. do. At this time, whether the extracted PLMN information and the PLMN list match is determined according to the priority determined by the service server 20.

The manager terminal 37 is a computer, a laptop, a workstation, a personal digital assistant (PDA), and a portable multimedia player that can transmit and receive data to and from the service server 20 using a network (not shown). player) and mobile communication terminal. At this time, the network that connects the service server 20 and the manager terminal 37 may be a virtual private network (VPN), the Internet, an intranet, an extranet, or other well-known or future-developed wired, wireless, or the like. It may include a coupling network of.

The manager terminal 37 of the present embodiment transmits and sets the operator portion information for a plurality of overseas visitor networks 13 providing the international roaming service to the service server 20, and sets the status information of the international roaming service to the service server. Received from (20) can be output.

4 is a diagram illustrating a screen for setting operator portion information in the service server 20 in the manager terminal 37 according to an embodiment of the present invention. Referring to FIG. 4, the international roaming service manager is a service provider. You can enter 'Policy', 'Country', 'Vendor', 'Set percentage value' and 'Term' of the potion information. At this time, if the 'Default' item is checked, the 'Term' item cannot be input and if the specific policy is not set when the mobile terminal 11 requests roaming, the setting ratio of the visited network 13 as the default value is set. The value will be applied. In addition, when the set ratio value of the visited network 13 is input as 0, the visited network 13 of the operator is registered as FPLMN (Forbidden PLMN).

The international roaming service manager may modify the registered provider potion information, but since the corresponding policy is already activated and applied to the international roaming service within the period during which the policy is applied, the manager terminal 37 may apply the policy period. The policy can be set not to be modified within the system. Also, a warning message can be displayed so that the international roaming service manager can recognize it.

In addition, for each policy, when the PLMN list is transmitted to the mobile terminal 11, the PLMN list previously stored in the USIM of the mobile terminal 11 may be updated or the FPLMN may be downloaded.

The state information of the international roaming service is information indicating a state in which the plurality of portable terminals 11 receive the international roaming service from abroad.

FIG. 5 is a diagram illustrating a screen on which status information of an international roaming service is output according to an exemplary embodiment of the present invention. Referring to FIG. 5, a screen on which status information of an international roaming service is output is an item for distinguishing a country. 'Country', 'Active Policy', which indicates the policy currently being applied to each country, 'Total', which indicates the number of mobile terminals 11 currently roaming in each country, and international roaming service in each country. 'Vendor', which is an item that provides a provider, 'Portion', which is an item indicating a set percentage value assigned to each provider, and an item indicating the number of mobile terminals 11 roaming through the visitor's network 13 of each provider. 'Count', 'Actual', which represents the actual traffic distribution ratio value of each operator, and 'Deviation', which represents the difference between the actual traffic distribution ratio value and the set ratio value of each operator. can do. At this time, although not shown, 'Try', which is an item indicating a cumulative count value for each provider, additionally indicates a cumulative count value for which the mobile terminal 11 receives a roaming service to the visitor's visit network 13 of the roaming requester. The item 'SC' may further include 'FA', which is an item indicating a cumulative count value in which the mobile terminal 11 does not receive a roaming service to the visitor's network 13 of the operator requesting roaming.

6 is a block diagram showing a service server according to an embodiment of the present invention. 1 to 6, the service server 20 according to the present embodiment includes a server interface unit 21, a server storage unit 23, and a server control unit 25. In this case, the server transmission / reception unit 27 ) May be further included.

The server interface unit 21 has an interface for performing data transmission / reception with the gateway location register 19, and may further include an interface for performing data transmission / reception with the UCMS server 31 and the OTA server 33. have. Specifically, the server interface unit 21 has an interface for receiving subscriber information from the gateway location register 19, and additionally synchronizes the USIM card profile of the mobile terminal 11 with the UCMS server 31 or the USIM card. The key may be queried and may have an interface for transmitting a PLMN list to the OTA server 33.

The server storage unit 23 stores actual traffic distribution ratio values for the plurality of visited networks 13 in which the mobile terminal 11 is provided with the international roaming service, and the provider portion information for the operators operating the plurality of visited networks 13. In this case, the PLMN list or the roaming sub table may be further stored. In addition, user personal information or visited network service information may be further stored.

User personal information includes personal information about the user such as gender, age and address of the user, and service information provided by the user, and the services provided by the user include, for example, a plan or call charge information, data call charge information, additional service information, and a user. Roaming history information, etc., but is not limited thereto.

The visited network service information refers to additional service information that is additionally available in addition to the current call service in the visited network and marketing and promotion information currently provided by the visited network operator.

The server transmitter / receiver 27 has an interface for performing data transmission / reception with the manager terminal 37 via a network (not shown). Specifically, the server transmission and reception unit 27 receives the operator portion information from the manager terminal 37, and has an interface for transmitting the status information of the international roaming service.

The server controller 25 controls overall operations of the server interface 21, the server storage 23, and the server transmitter / receiver 27.

When the mobile terminal 11 requests location registration to receive a roaming service abroad, the server controller 25 according to the present embodiment receives a subscriber of the mobile terminal 11 from the gateway location register 19 through the server interface 21. When the information is received, the mobile terminal 11 checks which country requests the location registration through which visit network 13 in which country with reference to the country code CC and the operator code VC included in the subscriber's information.

The server controller 25 is set in advance in the server storage unit 23 for the visited network 13 to which the mobile terminal 11 requests location registration, and the set ratio value stored in advance and the actual value of the current visited network 13. The traffic distribution ratio value is extracted and compared.

At this time, the server control unit 25 is a setting ratio value and the actual value applied to the time when the mobile terminal 11 requests the location registration, when a specific period during which the setting ratio value for the visited network 13 is applied is set. The size of the traffic distribution ratio value can be compared.

When the server controller 25 confirms that the actual traffic ratio value for the visited network 13 is larger than the set ratio value, the server controller 25 transmits a roaming disallowed message to the gateway location register 19.

At this time, if the server controller 25 determines that the actual traffic ratio value for the visited network 13 is equal to or smaller than the set ratio value, the server controller 25 transmits a roaming permission message to the gateway location register 19.

In addition, when the server control unit 25 receives the subscriber information of the mobile terminal 11 from the gateway location register 19 through the server interface unit 21, the server control unit 25 carries the mobile terminal with reference to the country code (CC) included in the subscriber information. The terminal 11 may extract a set ratio value and an actual traffic distribution ratio value for the entire visited network 13 providing the international roaming service in the corresponding region requesting location registration. Subsequently, the server controller 25 calculates a difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio values for the plurality of visited networks 13, respectively, and the corresponding visited network to which the mobile terminal 11 requests location registration. If the difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio value of (13) is not the largest, the roaming disallowed message may be transmitted to the gateway location register 19.

In this case, when the difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio value of the visited network 13 requesting location registration is the largest, the roaming permission message is transmitted to the gateway location register 19. Can be.

For example, referring to FIG. 5, when the mobile terminal 11 requests a location registration request through a visit network 13 of a d or f operator in a country B, a roaming disallowed message is transmitted to the gateway location register 19. And, when a request for location registration through the e-business visit network 13, the roaming permission message is transmitted to the gateway location register 19.

In addition, when the mobile terminal 11 confirms that the visited network 13 requesting location registration is a Forbidden Public Land Mobile Network (FPLMN), the roaming disallowed message may be transmitted to the gateway location register.

In another embodiment of the present invention, when the server controller 25 receives the subscriber information from the gateway location register 19 through the server interface 21, the actual traffic distribution ratio value for the visited network 13 is visited. If it is larger than the set ratio value for the network 13, the roaming disallowed message is transmitted to the gateway location register 19, and then the roaming subtable stored in the server storage unit 23 may be extracted. Subsequently, the PLMN list corresponding to the subscriber information of the mobile terminal 11 is extracted, and the first PLMN is obtained by subtracting the actual traffic distribution ratio value from the traffic setting ratio value in the country where the mobile terminal 11 requests location registration. This largest visit network 13 can be set.

In detail, the server controller 25 may use the PLMN list and the PLMNXXXATI items in the PLMN list shown in FIG. 3 in the traffic setting ratio value of the visited network 13 in the country where the mobile terminal 11 requests the location registration. The difference value obtained by subtracting the actual traffic distribution ratio value may be changed to information on the visited network 13 having the largest value.

For example, referring to FIG. 5, when the mobile terminal 11 requests a location registration through the visitor's network in the country B, the actual distribution ratio value (63%) is larger than the set ratio value (60%). Therefore, the service server 20 checks the setting ratio value and the actual distribution ratio value assigned to each operator (d, e, f) in the country B, and the difference value obtained by subtracting the actual distribution ratio value from the setting ratio value is the largest. b The visited network 13 operated by the operator (2%) is set as the first PLMN.

In another embodiment of the present invention, the server controller 25 extracts a PLMN list corresponding to the subscriber information of the mobile terminal 11 and then refers to at least one parameter of user personal information stored in the server storage unit 23. You can set the priority of the PLMN list by setting the parameter. For example, a user with a large amount of data usage can set the visit network with the lowest price due to data usage as the first PLMN. A user with a lot of additional services uses a visit network that provides additional services frequently used by the user. Can be set. In addition, when a specific visited network is marketing to a specific age group, a user having the corresponding age group may set the visited network as the first PLMN.

In addition, when setting the priority of the PLMN list using two or more parameters, each parameter may be weighted. For example, if two parameters, call rate and value-added service, are set as reference parameters, and the call rate is weighted higher than value-added service, the visit network with low call rate is set as the first PLMN, and the value-added service frequently used by users You can set the visiting network as the second PLMN.

Thus, by setting the priority of the PLMN list through the user personal information, it is possible to provide a roaming service according to the user preference.

When newly setting the received subscriber information or PLMN list, the server controller 25 may reflect the set PLMN list and the received subscriber information in the roaming subtable.

The roaming sub table is a table storing information on the mobile terminal 11 that the service server 20 is roaming.

7 is a diagram illustrating a roaming sub table according to another embodiment of the present invention. Referring to FIG. 7, the roaming sub table is a subscriber identification number 'UserID' and a subscriber identification number used as an index. 'CreateTime' is the time when the first was created, 'UpdateTime' was the time when the subscriber identification number was last sent an overseas location registration, 'GroupID' was the PLMN list group ID, and the country code indicating the country or country group the subscriber is currently roaming. (CC), which is the Country Code, and VC, which is the Vendor Code that represents the visitor network 13 that the subscriber is currently roaming, and whether the subscriber is in the VPLMN (Visited PLMN) or the HPLMN (Home PLMN). It includes a 'RoamingFlag', the data type (Data Type) may be input as OCTETS (byte data), DATE (time data), INT (integer data). In this case, 'CC' or 'VC' may be provided as a VLR number or a Serving GPRS Supporting Node (SGSN) number, and 'UserID' may be provided as Mobile Station ISDN (MSISDN) information, but is not limited thereto.

If there is no subscriber information in the roaming subtable, the server controller 25 may generate a new roaming subtable and reflect the received subscriber information and the newly set PLMN list, and store the received subscriber information and the prestored roaming subtable. In comparison, when there is a difference, the roaming subtable may be updated to reflect the subscriber information, and when the PLMN list is newly set, the roaming subtable may be updated to reflect the set PLMN list.

In addition, when the server controller 25 confirms that the actual traffic ratio value of the visited network 13 is equal to or smaller than the set ratio value, the server controller 25 transmits a roaming permission message and then stores the roaming subtable stored in the server storage unit 23. The roaming subtable may be updated to reflect the subscriber information.

Thereafter, the server controller 25 transmits the newly set PLMN list to the OTA server 33. In this case, the service server 20 may format the data in an APDU format for data communication with the USIM module and transmit the data to the OTA server 33. In addition, when formatting the data, the UCMS server 31 can query the card key of the USIM card, and can perform the data format using a security policy (SP) method.

In this case, the server controller 25 may transmit the visited network service information together when transmitting the newly set PLMN list to the OTA server 33. By providing the visited network service as described above, the user can be induced to select the visited network by checking the services, marketing and promotion information provided by the operator of the visited network together with the PLMN list.

On the other hand, the server controller 25 refers to the roaming sub-table, when the mobile terminal 11 stores the operator code that has performed the location registration, and confirms that the registered PLMN (RPLMN) in the mobile terminal 11, The deletion message for deleting the RPLMN in the mobile terminal 11 may be transmitted.

At this time, the server controller 25 may transmit a newly set PLMN list along with a deletion message for deleting the RPLMN in the mobile terminal 11 while transmitting the PLMN list, and when the power of the mobile terminal 11 is turned on or off. That is, when the location registration is performed when the mobile terminal 11 is turned on or off, or the local time of the corresponding country where the mobile terminal 11 is located, the message is deleted at a preset time such as, for example, a late night time. Can also be transmitted.

8 is a flowchart illustrating a roaming service method of a mobile terminal according to an embodiment of the present invention. Referring to FIGS. 1 and 8, when the visited network 13 receives a foreign roaming request signal from a mobile terminal 11 to receive an international roaming service abroad (S41), the overseas roaming request of the mobile terminal 11 is performed. In accordance with the request to the gateway position register 19, the mobile station 11 registers the position (S43).

In step S43, the gateway location register 19 which is requested to register the location of the mobile terminal 11 transmits subscriber information to the service server 20 (S45).

In this case, the gateway location register 19 may extract the subscriber information by referring to the location registration request message (Update Location) received from the portable terminal 11 through the visit network 13 and transmit the extracted subscriber information to the service server 20. As described above, as an example, the gateway location register 19 may identify subscriber information from global title (GT) information of a location registration request message formed by combining a code indicating a country and a code indicating a visit network. have.

The service server 20 receiving the subscriber information in step S45 checks the country and the visited network 13 to which the mobile terminal 11 requests the location registration from the subscriber information, and the mobile terminal 11 registers the location. The actual traffic distribution ratio value for the requesting visitor network 13 is compared with the setting ratio value for the visitor network 13 included in the provider portion information (S47).

At this time, the service server 20 is a setting ratio value and the actual value applied to the time when the mobile terminal 11 requests the location registration, when a specific period during which the setting ratio value for the visited network 13 is applied is set. The size of the traffic distribution ratio value can be compared.

In addition, the service server 20 may determine the size of the set ratio value and the actual traffic distribution ratio value for the entire visited network 13 that provides the international roaming service in the region where the mobile terminal 11 requests location registration. Can be compared.

In step S47, if the actual traffic distribution ratio value for the visited network 13 is equal to or less than the set ratio value for the visited network 13, the service server 20 roams to the gateway location register 19. The allow message is transmitted (S49).

Upon receiving the roaming permission message in step S49, the gateway location register 19 transmits a location registration message to the home location register 17, and accordingly receives the ISD information transmitted from the home location register 17, thereby carrying the portable terminal. The subscriber information of (11) is managed (S51).

In step S51, the gateway location register 19 which performs location registration in association with the home location register 17 transmits a location registration completion message to the mobile terminal 11 through the visit network 13 (S53).

If the actual traffic distribution ratio value for the visited network 13 is greater than the set ratio value for the visited network 13 in step S47, the service server 20 sends a roaming not allowed message to the gateway location register 19. Transmit (S55).

At this time, the service server 20 calculates a difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio value for the entire visited network 13 in the region, and the mobile terminal 11 requests the location registration. If the difference value obtained by subtracting the actual traffic distribution ratio value from the set ratio value of the visited network 13 is not the largest, the roaming disallowed message may be transmitted to the gateway location register 19.

In addition, when the mobile terminal 11 confirms that the visited network 13 requesting location registration is a Forbidden Public Land Mobile Network (FPLMN), the roaming disallowed message may be transmitted to the gateway location register.

Upon receiving the roaming disallowed message in step S55, the gateway location register 19 transmits a location registration failure message to the mobile terminal 11 through the visit network 13 (S57). Thereafter, the mobile terminal 11 attempts to request a location registration to another visited network 13 in the region.

9 is a flowchart illustrating a roaming service method of a mobile terminal according to another embodiment of the present invention. 1 and 8, the steps S61 to S77 are the same processes as the steps S41 to S57 of FIG. 8, and thus descriptions thereof will be omitted.

In step S77, the service server that has transmitted the roaming disallowed message to the gateway location register 20 by confirming that the actual traffic distribution ratio value for the visited network 13 is greater than the set ratio value for the visited network 13. 20 extracts a roaming sub table stored therein (S79).

Subsequently, the service server 20 extracting the roaming sub-table in step S75 extracts a PLMN list corresponding to the subscriber information of the mobile terminal 11, and the country where the mobile terminal 11 requests location registration for the first PLMN. The difference value obtained by subtracting the actual traffic distribution ratio value from the traffic setting ratio value within is set to the largest visited network 13 (S81).

In this case, the service server 20 may extract the PLMN list corresponding to the subscriber information of the mobile terminal 11 and set the priority of the PLMN list by setting at least one parameter of the user personal information as a reference parameter.

The service server 20 which sets the PLMN list in step S81 reflects the received subscriber information and the newly set PLMN list to the roaming subtable and stores the received subscriber information (S83).

At this time, if there is no subscriber information in the roaming subtable, the server controller 25 may generate a new roaming subtable and store the received subscriber information and the newly set PLMN list, and store the received subscriber information and previously stored roaming. When there is a difference by comparing the subtables, the roaming subtable may be updated to reflect the subscriber information, and when the PLMN list is newly set, the roaming subtable may be updated to reflect the set PLMN list.

In addition, if it is determined in step S67 that the actual traffic ratio value of the visited network 13 is equal to or smaller than the set ratio value, the roaming subtable is extracted after the roaming permission message is transmitted, and the subscriber information is reflected. Roaming subtables can also be updated.

The service server 20 updating the roaming sub table in step S83 requests the UCMS server 31 the profile of the USIM card mounted on the mobile terminal 11 and receives the USIM card profile from the UCMS server 31. Synchronize (S85).

In step S85, the service server 20 synchronizing the UCMS server 31 with the USIM card profile transmits the newly set PLMN list to the OTA server 33 (S87).

In this case, the service server 20 may format the data in an APDU format for data communication with the USIM module and transmit the data to the OTA server 33. In addition, when formatting the data, the UCMS server 31 can query the card key of the USIM card, and can perform the data format using a security policy (SP) method.

In addition, the service server 20 may transmit the visited network service information together when transmitting the newly set PLMN list to the OTA server 33.

On the other hand, the service server 20 refers to the roaming sub-table, when the mobile station 11 confirms that the carrier code for which the location registration is performed and the RPLMN exists in the mobile terminal 11, the mobile terminal 11 ) You can send a delete message to delete the RPLMN. In this case, the service server 20 may transmit a deletion message for deleting the RPLMN in the portable terminal 11 while transmitting the PLMN list, and when the portable terminal 11 is powered on or off, that is, the portable terminal 11 ), When the location registration is performed when the power is turned on or off, or the local time of the corresponding country where the mobile terminal 11 is located, the deletion message may be transmitted at a preset time.

After receiving the PLMN list in step S87, the OTA server 33 performs an SMS format to transmit the received PLMN list to the mobile terminal 11 in an SMS manner, and then includes an FSM list including the PLMN list. The message is transmitted to the visited network 13 through the gateway location register 19 (S89).

The visited network 13 receiving the FSM message in step S89 generates a short message including the corresponding PLMN list information in association with a short message service center (SMSC, not shown), and then stores the short message in the portable terminal. Transfer to step (11) (S91).

The mobile terminal 11 receiving the short message in step S91 transfers the PLMN list included in the received short message to the USIM card mounted therein (S93), and the USIM card stores the PLMN list in the internal memory. (S95).

Thereafter, when the mobile terminal 11 requests the location registration again, the mobile terminal 11 may perform the location registration process using the PLMN list received from the OTA server 33 through the visit network 13.

As described above and described with reference to a preferred embodiment for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described as such, without departing from the scope of the technical idea It will be understood by those skilled in the art that many changes and modifications to the present invention are possible. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

According to the present invention, the additional roaming service system does not require a separate device in order to control traffic between a plurality of overseas providers that provide international roaming services, thereby minimizing additional costs. In particular, in view of the trend of increasing number of users moving abroad, the method of roaming service of the mobile terminal of the present invention will not be less useful.

11: mobile terminal 13: visit network
17: Home Location Register 19: Gateway Location Register
20: service server 21: server interface unit
23: server storage unit 25: server control unit
27: server transmission and reception unit 31: UCMS server
33: OTA server 37: administrator terminal

Claims (23)

A gateway location register that receives an international roaming request from a mobile terminal and transmits subscriber information of the mobile terminal, and transmits a location registration failure message to the mobile terminal upon receiving a roaming disallowed message;
With reference to the subscriber information received from the gateway location register, the actual traffic distribution rate value for the visited network requested for location registration by the mobile terminal and the set ratio value of operator portion information for the visited network. A service server for transmitting the roaming disallowed message to the gateway location register when the actual traffic distribution ratio value for the visited network is greater than the set ratio value for the visited network;
Roaming service system of a mobile terminal, comprising a. A server interface unit for transmitting and receiving data with the gateway location register;
A server storage unit for storing actual traffic distribution ratio values and provider portion information for a plurality of visited networks;
With reference to the subscriber information of the mobile terminal for receiving the international roaming service received from the gateway location register through the server interface unit, the actual traffic distribution ratio value for the visited network to which the mobile terminal has requested location registration and the operator for the visited network. A server control unit for comparing the set ratio value of the potion information and transmitting a roaming disallowed message to the gateway location register when the actual traffic distribution ratio value for the corresponding visit network is larger than the set ratio value for the visit network;
Service server comprising a. The method of claim 2, wherein the server control unit,
And comparing a setting ratio value of service provider portion information with respect to a plurality of visitor networks in a region in which the mobile terminal requests location registration and an actual traffic distribution ratio value. The method of claim 3, wherein the server control unit,
If the visited network requesting location registration by the mobile terminal is not the visited network having the largest difference between the set ratio value and the actual traffic distribution ratio value among the plurality of visited networks in the region, roaming not allowed message to the gateway location register. Service server, characterized in that for transmitting. The method of claim 2, wherein the server control unit,
And a roaming disallowed message to the gateway location register when the visited network requesting location registration by the mobile terminal is a Forbidden Public Land Mobile Network (FPLMN). The method of claim 2,
The server interface unit has an interface for transmitting and receiving data with the OTA (Over The Air) server,
The server storage unit further stores a PLMN list. The method of claim 6,
The server controller extracts a Public Land Mobile Network (PLMN) list corresponding to the subscriber information, and selects the first PLMN of the extracted PLMN list from the set ratio value in the region where the mobile terminal requests location registration. The service server, characterized in that the difference is obtained by subtracting the traffic distribution ratio value is the largest visited network, and transmits the set PLMN list to the OTA server through the server interface. The method of claim 6,
The server storage unit further stores the user personal information. The method of claim 8,
The server controller extracts a PLMN list corresponding to the subscriber information, sets a priority of the extracted PLMN list with reference to the user personal information, and then sets the set PLMN list to the OTA server through the server interface. Service server, characterized in that for transmitting. The method according to claim 7 or 9,
The server storage unit further stores the visited network service information. The method of claim 10,
And the server controller transmits the visited network service information to the OTA server through the server interface unit together with the set PLMN list. The method of claim 2,
The subscriber information includes a subscriber identification number, a country code and a provider code. The service server of claim 2, further comprising a server transmitter / receiver for transmitting and receiving data with the manager terminal. The method of claim 13,
The server control unit, the service server, characterized in that for receiving and storing the provider portion information for the plurality of visited network from the administrator terminal via the server transmission and reception unit. The method of claim 2,
The service provider portion information includes a plurality of country identification information abroad, a plurality of service provider identification information for providing an international roaming service abroad, period information for applying the set ratio value and the set ratio value. Receiving, by the service server, subscriber information of the mobile terminal for receiving the international roaming service from the gateway location register;
The service server may calculate the actual traffic distribution rate value for the visited network to which the mobile terminal has requested location registration with reference to the received subscriber information, and the set ratio value of operator portion information for the visited network. Comparing step of comparing;
A first transmission step of transmitting, by the service server, a roaming disallowed message to the mobile terminal through the gateway location register when the actual traffic distribution ratio value for the visited network is greater than a set ratio value for the visited network; ;
Roaming service method of a mobile terminal comprising a. The method of claim 16, wherein the comparing step,
Roaming service method of a mobile terminal, characterized in that the comparison between the set ratio value of the carrier portion information for the plurality of visited network in the area where the mobile terminal requested the location registration and the actual traffic distribution ratio value. The method of claim 17, wherein the first transmission step,
The gateway location register when the visited network to which the mobile server requests location registration by the mobile server is not the largest visited network having a difference between the set ratio value and the actual traffic distribution ratio value among a plurality of visited networks in the region; Roaming service method of a mobile terminal, characterized in that for transmitting a roaming disallowed message. The method of claim 16, wherein after the receiving step,
Transmitting, by the service server, a roaming disallowed message to the gateway location register when the visited network to which the portable terminal requests location registration is a Forbidden Public Land Mobile Network (FPLMN);
Roaming service method of a mobile terminal, characterized in that it further comprises. The method of claim 16, wherein after the first transmission step,
The service server extracts a Public Land Mobile Network (PLMN) list corresponding to the subscriber information, and the first PLMN of the extracted PLMN list is selected from the set ratio value in the region where the mobile terminal requests location registration. A setting step of setting the visited network having the largest difference obtained by subtracting the traffic distribution ratio value;
Roaming service method of a mobile terminal, characterized in that it further comprises. The method of claim 16, wherein after the first transmission step,
A setting step of the service server extracting a PLMN list corresponding to the subscriber information and setting a priority of the extracted PLMN list with reference to user personal information;
Roaming service method of a mobile terminal, characterized in that it further comprises. The method of claim 20 or 21, wherein after the setting step,
A list transmission step of the service server transmitting the set PLMN list to an OTA server;
Roaming service method of a mobile terminal, characterized in that it further comprises. The method of claim 22, wherein the list transmission step,
And the service server transmits visiting network service information together with the set PLMN list.

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