KR20090105232A - System for informing promptly international roaming fee and control method thereof, mobile communication apparatus used in the system and control method therof - Google Patents

Abstract

PURPOSE: An international roaming communication fee, a guide system, a control method, a mobile communication terminal and a control method being used in a system are provided to confirm the communication fee with termination of the connection. CONSTITUTION: An international roaming communication fee, a guide system, a control method, a mobile communication terminal and a control method being used in a system includes a national mobile network server(200), an oversea mobile radio communication network(300), and a mobile communication terminal(100). The national mobile network server transmits international roaming call data. The oversea mobile radio communication network provides the international roaming conversation service. The mobile communication terminal stores international roaming call cost data received from the national mobile network server.

Description

International roaming call charge prompt system and control method, and mobile communication terminal and control method thereof used in the system.

The present invention relates to an instant roaming call charge prompting system and a control method thereof, a mobile communication terminal used in the system, and a control method thereof. More specifically, the present invention relates to a user immediately after making a call using international roaming. The present invention relates to an international roaming call charge prompt guidance system and a control method thereof, a mobile communication terminal used in the system, and a control method thereof.

Recently, due to the development of mobile communication network and electronic communication technology, the use of mobile communication terminals has been widely used.

In addition, although the calls between countries could not be made due to the different characteristics of each network, the inter-country network interworking was recently performed, and the mobile terminal has been equipped with an additional function for international roaming. You can make a phone call from abroad using domestic.

However, despite the increasing number of people coming and going for international business roaming for business or travel purposes worldwide, rates for international roaming calls are relatively expensive compared to domestic call rates. Users have no means of easily knowing the complaints to users.

For example, a user who makes a number of calls through international roaming without any objection from abroad may complain that he or she has to pay a high rate only after receiving a telephone bill later.

In addition, it is not easy for a user who wants to make an international roaming call to check an international roaming call rate abroad at the time of use.

The present invention has been made to solve the above-mentioned conventional problems, the purpose of the international roaming call prompt information system and control method so that the user can immediately inform the user of the international roaming call charges when an international roaming call; Another aspect of the present invention is to provide a mobile communication terminal used in the system and a control method thereof.

Another object of the present invention is to calculate and process the call / communication charges according to whether the voice call, text message communication, origination and incoming call itself, the international roaming call charges so that the user can find out in the event of incorrectly calculated call charges later An immediate guidance system and its control method, and a mobile communication terminal and its control method used in the system.

In order to achieve the above object, the international roaming call charge prompt guidance system according to the present invention comprises: a domestic mobile communication network server for transmitting international roaming call rate data; An overseas mobile communication network providing an international roaming call service; Store the international roaming call rate data received from the domestic mobile communication network server, calculate the call charges using the talk time and the stored international roaming call rate data when the international roaming call is made through the overseas mobile communication network from abroad It comprises a mobile communication terminal informing a user of a call charge.

In addition, to achieve the above object in accordance with the present invention in accordance with the present invention, a mobile communication terminal and a mobile communication terminal in the domestic mobile communication network provided in the overseas, overseas mobile communication network provided in the overseas, and mobile for international roaming processing including the mobile communication terminal A control method of a communication system includes the steps of: transmitting, by the domestic mobile communication network server, international roaming call rate data to the mobile communication terminal; When the mobile communication terminal stores the international roaming call rate data received from the domestic mobile communication network server, and changes to the international roaming support state, when the international roaming call is made through the overseas mobile communication network, the talk time and the stored international roaming call Calculating the call charge using the rate data, and informing the user of the calculated call charge.

In addition, in order to achieve the above object, a mobile communication terminal displaying an international call charge according to the present invention includes a communication interface for communicating with a domestic mobile communication network server and an overseas mobile communication network; A storage unit for storing international roaming call rate data received from the domestic mobile communication network server through the communication interface unit; A display unit displaying an image; When the international roaming call is made through the overseas mobile communication network after the setting is changed to the international roaming support state, the call rate is calculated using the talk time and the international roaming call rate data stored in the storage unit, and the displayed call rate is displayed. It is configured to include a control unit for controlling the unit.

In addition, the control method of the mobile communication terminal to communicate with the domestic mobile communication network server and the overseas mobile communication network according to the present invention to achieve the above object, receiving and storing the international roaming call rate data from the domestic mobile communication network server; ; Setting and changing to an international roaming support state; When an international roaming call is made through the overseas mobile communication network, a call charge is calculated using the talk time and the stored international roaming call rate data, and the user is informed of the calculated call charge.

As described above, according to the present invention, when the mobile terminal user makes an international roaming call, the user can immediately check the call charges with the termination of the call.

In addition, not only voice calls (outgoing and receiving) using international roaming, but also voice calls in overseas regions, as well as communication charges associated with text message transmission, the mobile terminal user can immediately check.

If the mobile communication terminal stores the country information matching data matching the country information and the system ID, the country information can be extracted using the system ID received from the overseas mobile communication network. International roaming call rates can be automatically determined, increasing user convenience without the user having to manually set the country in which they are staying.

In addition, by storing and managing the international roaming call records in the mobile communication terminal, there is an effect that the user can easily check the error associated with the future charges.

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

International roaming call charge prompt guide system according to an embodiment of the present invention comprises a domestic mobile communication network server 200, overseas mobile communication network 300, a mobile communication terminal 100 as shown in FIG.

The domestic mobile communication network server 200 transmits the international roaming call rate data to the mobile communication terminal 100, where the international roaming call rate data may be automatically calculated by the domestic mobile communication terminal 100 as described below. Currency rate information is included.

Of course, the international roaming call rate data may further include not only the call rate required for international roaming calls, but also information about call rates and text message transmission rates in other overseas countries.

The international roaming call rate data is transmitted from the domestic mobile communication network server 200 to the mobile communication terminal 100 may be, for example, an OTASP (Over-the-air Service Provisioning) method, which is a mobile communication terminal 100 Even if the user does not visit the dealer or the A / S center, the predetermined communication software or data may be stored and updated in the mobile communication terminal 100 through communication between the mobile communication terminal 100 and the base station.

In order to transmit international roaming call rate data through OTASP, an arbitrary band (BLOCK_ID is within the range of '1000 0000' to '1111 1110') by applying to 3GPP2 (The Third Generation Partnership Project 2) in advance. Should receive

Although the present invention is not limited to the above-described OTASP method, in describing the embodiments according to the present invention, the international roaming basic data is transmitted from the domestic mobile communication network server 200 to the mobile communication terminal 100 through the OTASP. Assume that it is done.

The domestic mobile communication network server 200 may transmit international roaming basic data using a System Selection For Preferred Roaming (SSPR) call of OTASP. For example, the international mobile roaming basic data may be transmitted using a SSPR Download Request Message. 100).

An example of international roaming call rate data transmitted using OTASP is shown in FIG. 2.

Although the international roaming call rate data shown in the figure includes only rate cards of two countries, for example, the United States and New Zealand, the contract is concluded to provide the international roaming call service to the user of the mobile terminal 100 as much as possible. It is desirable to include rate cards for all countries.

In FIG. 2, when the country name is 'US', the first data of the US item '313' means 313 won per minute when making a call in the US, and the second data, '835' is US Calls from Korea to Korea at 835 won per minute. In the U.S., the third data, "421" means 421 won per minute if you receive a call (does not consider where you are from), and the fourth data, "157", is U.S. In case of sending short text, it means 413 won per case will be charged.

Herein, the above format is merely an example and may be divided into more various conditions or a single condition according to a country.

In addition, in the present embodiment it is described that there is only one fare system for international roaming calls from the United States to Korea, but the international telephone connection number (such as '001', '00700', etc.) available in the United States If there are a plurality of rates, the rate system for each international telephone connection number may be divided and included in the international telephone rate data.

The domestic mobile communication network server 200 performing such a function is a server provided in the domestic mobile communication network and communicates with the mobile communication terminal 100 through the base station 210. The domestic mobile communication network is provided with a base station controller, an exchanger, a packet router, a text message transmission center, etc. for communication processing, but the functions of these components are well known and thus are not shown, and description thereof will be omitted.

Meanwhile, the overseas mobile communication network 300 provides a mobile communication terminal 100 with a service that enables international roaming calls from a country (for example, the United States) to a domestic (for example, Korea) through a connection with a domestic mobile communication network. to provide.

That is, when the mobile communication terminal 100 set as the international roaming preferred list (PRL) makes an international call connection request, the overseas mobile communication network 300 includes an international call connection number (eg, included in the call connection request). For example, '00') and counterpart country code (for example, '82') are analyzed to provide international roaming call service if necessary.

Meanwhile, the overseas mobile communication network 300 periodically transmits a system parameter message including a system ID. The system parameter message may correspond to, for example, a system parameter message set in the IS-95 specification. That is, a communication channel for transmitting a predetermined signal to the mobile communication terminal 100 through the base station 310 includes a pilot channel, a synchronization channel, a call channel, a call channel, and the like, and the system parameter message moves through the call channel. It may be transmitted to the communication terminal 100.

Such a system parameter message may be used to extract country information in which the mobile communication terminal 100 is located, as described below.

The mobile communication terminal 100 stores the international roaming call rate data received from the domestic mobile communication network server 200, and when the international roaming call is made through the overseas mobile communication network 300, the call time and the stored The call charge is calculated using the international roaming call rate data, and the user is informed of the calculated call charge.

An example of such a functional block of the mobile communication terminal 100 is shown in FIG. 3.

As shown in the figure, the mobile communication terminal 100 includes a communication interface unit 110, a key input unit 130, a storage unit 140, a speaker 160, a display unit 150, and a control unit 120. It is configured by.

The communication interface 110 communicates with a domestic mobile communication network or an overseas mobile communication network 300 (more precisely, a base station of each communication network) to perform a function of transmitting and receiving predetermined information.

The key input unit 130 provides a user interface, the speaker 160 outputs a sound signal, and the display unit 150 displays a predetermined image under the control of the controller 120. In particular, in the present embodiment, the display unit 150 displays the call charge or the communication charge.

The storage 140 stores international roaming call rate data received from the domestic mobile communication network server 200 through the communication interface 110.

In addition, the storage 140 may further store the country information matching data matching the country information and the system ID. Here, the national information matching data may be stored at the time of shipment of the mobile communication terminal 100 as a unique system ID included in the system parameter message transmitted from the mobile communication network of each country and the corresponding country, or may be stored in an international roaming call. It may be received and stored from the domestic mobile communication network server 200 as the rate data.

As such, an example of country information matching data stored in the storage 140 of the mobile communication terminal 100 in addition to the international roaming call rate data is illustrated in FIG. 4.

As shown in FIG. 4, country information (for example, country name) matching each system ID is included in the country information matching data. Furthermore, the country information matching data may further include not only country information but also regional information (for example, region name) matching each system ID.

In the present embodiment, the country information matching data need to be included in the storage unit 140 to directly extract the calling country information for sending the call access signal using the system ID received from the overseas mobile communication network 300. For example, when the originating country is specified by the user's manual setting, such country information matching data does not need to be stored.

The storage unit 140 also accumulates and stores call charges, particularly call charges according to international roaming calls.

The controller 120 stores the international roaming call rate data and the country information matching data received from the domestic mobile communication network server 200 in the controller 120, and after the setting is changed to the international roaming support state, the overseas mobile communication network ( When an international roaming call is made through 300, a call charge is calculated using a talk time and international roaming call rate data stored in the storage 140, and the display unit 150 is controlled to display the calculated call charge. Do this.

That is, the controller 120 controls to display the call charge according to the call after the call is over, and the call charge is calculated according to the time when the call is made, that is, the call time and the call rate. The rate is included in the international roaming call rate data received from the domestic mobile communication network server 200 and stored in the storage 140.

The call rate data may include the voice call rate data and the text message communication charge data separately. In this case, when the voice call is made, the controller 120 may determine the voice call rate data and the call time based on the voice call rate data. The call charge is calculated, and when the text message communication is made, the call charge according to the text message communication is calculated based on the text message communication charge data.

In particular, when the voice call rate data includes the outgoing local call rate data and the outgoing international roaming call rate data separately, the controller 120 moves the called party including the country code (for example, Korea '82'). When the call processing is performed by making a call connection request to the communication terminal 100 "number, the call charge is calculated based on the outgoing international roaming call rate data using the country corresponding to the country code and the call time, When the call processing is performed by making a call connection request to the called-party mobile communication terminal 100 " The controller 120 may accumulate and store the call charge calculated as described above in the storage 140.

A detailed call charge calculation process performed by the controller 120 will be described later.

Hereinafter, a control process of an international roaming call charge prompt guidance system according to an embodiment of the present invention will be described with reference to FIGS. 5 to 8B. In the present embodiment, the user of the mobile communication terminal 100 makes or receives a call while traveling to the United States as an example. Of course, text messages are also assumed to be sent in the United States.

First, a process of transmitting basic information necessary for calculating a call charge in the international roaming call charge prompt guidance system according to an embodiment of the present invention will be described with reference to FIG. 5.

First, when a user of a mobile communication terminal 100 supporting international roaming issues an international roaming setting command at an airport before departure (step S1), the mobile communication terminal 100 changes a setting state to enable international roaming (step S1). S3).

Here, the setting state for enabling international roaming may be referred to as a setting state for enabling communication with a system other than a domestic system (ie, a mobile communication network system). Since this process is a known technique, a more detailed description thereof will be omitted. However, if the mobile communication terminal 100 can automatically convert the domestic or international roaming setting state based on a predetermined message from the mobile communication network, this process can be omitted.

Subsequently, the mobile communication terminal 100 establishes a communication channel with the domestic mobile communication network server 200 and receives international roaming call rate data from the domestic mobile communication network server 200 (step S5). Of course, international roaming call rate data is not necessarily received only at the airport, etc., before departure, or after the mobile communication terminal 100 is changed to the international roaming setting state, but international roaming call rate data is used when making international roaming calls abroad. Since it is necessary data for calculating the call charge, it is preferable that the data is received by the mobile communication terminal 100 in the same situation as the present embodiment.

In addition, the domestic mobile communication network server 200 transmits the country information matching data to the mobile communication terminal 100 (step S7), where the country information matching data is the information that the country information and the system ID is matched. That is, the information for confirming the country information using the system ID of the mobile communication network in overseas. An example of the country information matching data has been described with reference to FIG. 4.

The mobile communication terminal 100 receiving the international roaming call rate data and the country information matching data from the domestic mobile communication network server 200 stores them in the storage 140 (step S9).

Up to this point, the process is performed in the domestic stage before departure, and the subsequent steps correspond to the process performed in the state in which the user of the mobile communication terminal 100 has left the United States.

The mobile communication terminal 100 establishes a communication channel with the overseas mobile communication network 300 (for example, the US mobile communication network) and receives a system parameter message periodically received from the overseas mobile communication network 300 (step S11). .

Here, the system parameter message is a message sent to all terminals capable of communicating with the base station 310 through the call channel from the mobile communication system, that is, the base station 310, and IS-95 which forms the basis of the code division multiple access (CDMA) communication. For example, such a system parameter message includes a system ID (SID: System Identicication) and a network identifier (NID: Network Identificaion).

That is, the system ID included in the system parameter message of the present embodiment may correspond to the SID in the IS-95, or the SID and the NID pair. Any information having a unique value to distinguish each country may be used. Is also applicable.

Receiving the system parameter message (step S13), the mobile communication terminal 100 extracts the system ID from the system parameter message (step S15).

The mobile communication terminal 100 reads out country information (for example, country name) corresponding to the extracted system ID from the country information matching data of the storage unit 140 (step S17).

As shown in FIG. 4, for example, if the system ID 191 extracted from the system parameter message is '23828', the corresponding country 192 may be read.

The process of reading the country information in which the mobile communication terminal 100 is currently located is, before the international roaming call is made after the mobile communication terminal 100 is turned on, or at the time of the first international roaming call, Or whenever an international roaming call is made.

Since the read out country information is to determine which country's call rate data will be used in future international roaming calls, the mobile communication terminal 100 preferably reads out the country information in advance before the international roaming call is made and the storage unit 140. ). In the following description of an embodiment according to the present invention, the country information, that is, the call originating country (call) is described as an example that the 'United States'.

Hereinafter, a process in which the mobile communication terminal 100 in the international roaming call charge prompt guidance system according to an embodiment of the present invention actually calculates the call charge and informs the user will be described. In the present embodiment, it is assumed that the international call rate data is already received and the international roaming setting is made (that is, the international roaming PRL is selected).

First, when the user commands a connection for a voice call (step S31), the talk time for calculating the talk time as the basis of the call charge calculation is recorded (step S33). For example, you can record call start time and call end time. A more detailed description thereof will be described later.

When the call is terminated (step S35), the mobile communication terminal 100 determines whether the call was received to a specific country (for example, 'Korea') (step S37). Whether the incoming country is 'Korea' can be made by checking whether the country code of the outgoing telephone number is '82'.

That is, when receiving the international roaming call rate data in the domestic stage 'Korea' in the beginning, it can inform that the destination country that can use the international roaming call rate data is 'Korea', and the mobile communication terminal 100 provides such information. On the basis of this, it is determined whether or not the destination country for which international roaming currency is made overseas is Korea.

In the present embodiment, it is an example of determining whether the called country is 'Korea', but it may be a country other than Korea depending on the setting. For example, the mobile communication terminal 100 sold in the Republic of Korea is preferably the receiving country 'Korea', the mobile communication terminal 100 sold in Japan is preferably the destination country 'Japan'.

If the international roaming call rate data shown in FIG. 2 includes call rate information for a destination country other than 'Korea', that is, if call rate information for a plurality of destination countries is included, the mobile communication terminal 100 receives each incoming call. You can determine whether the currency is for your country.

On the other hand, in the case where the call is a call coming to Korea (step S37), the mobile communication terminal 100 extracts the rate for the international roaming call from the originating country to Korea from the international roaming call rate data (step S39). In this case, the originating country may be checked using the country information read out corresponding to the system ID as described in FIG. 5.

That is, since the state information is an example of the United States, the mobile communication terminal 100 retrieves the rate for international roaming calls from the United States to Korea from the international roaming call rate data.

In detail, the mobile communication terminal 100 first searches for records corresponding to the US field among the records shown in FIG. 2, and among them, the international roaming call, that is, the second data corresponding to the case where the called country is 'Korea'. Extract '.

On the other hand, if it is determined that the call is not received in Korea (step S37), the mobile communication terminal 100 determines whether it is a local call connection (step S41). In this case, the local call connection means a case where the calling country and the called country are the same. In other words, if you call the other party in the United States.

In this case, the mobile communication terminal 100 extracts the rate according to the local call from the international roaming call rate data (step S43). Referring to FIG. 2, the mobile communication terminal 100 extracts first data '313' which is a call rate according to a local call.

On the other hand, when a voice call is received (that is, when a call is received) instead of when a voice call is made (step S47), the mobile communication terminal 100 records the talk time according to the voice call (step S49), and the call ends. After (step S51), the rate according to voice reception is extracted from the international roaming call rate data (step S53). Referring to FIG. 2, the mobile communication terminal 100 extracts '421' which is the third data.

In this way, the mobile communication terminal 100 calculates the call charge by using the call rates extracted in steps S39, S43, and 53 and the recorded call time (step S59). Assuming that each rate information included in the international roaming call rate data is an amount per minute, the mobile communication terminal 100 can calculate the call rate by multiplying the extracted call rate by dividing the call time calculated in seconds by 60. have. At this time, the decimal point processing in the calculation may be changed according to the fare policy.

Meanwhile, as described above, when not only the voice call but also the international roaming call rate data includes the rate information according to the text message transmission, the mobile communication terminal 100 gives the user a usage fee per case whenever the text message is transmitted. You can inform.

That is, when detecting the sending of the text message (step S55), the mobile communication terminal 100 extracts the fee information according to the sending of the short message from the international roaming call rate data (step S57). Referring to FIG. 2, the fourth data '157', which is an amount used when transmitting a text message in the United States, is extracted.

Here, whether the voice call or the text message is transmitted may use information included in the call connection request signal. For example, you can distinguish between voice call and text service by checking the SERVICE_OPTION value of Seivice Connect Message.

Alternatively, the origination message for origination and the SERVICE_OPTION field value in the page response message can be used for an incoming call. That is, when the service option is 32768 (13K QCELP), 3 (EVRC), 1 (8K QCELP), it corresponds to a voice call, and when 6 (9.6Kbps) and 14 (14.4Kbps), it corresponds to text service usage.

As such, the mobile communication terminal 100 displays the call charges extracted from step S59 or the text message communication charges extracted from step S57 on the display unit 150 so that the user can know the cost of the call / communication.

An example of a screen displayed on the display unit 150 when an international roaming call is made from the US to Korea is illustrated in FIG. 7.

As shown in the figure, the mobile communication terminal 100 may display a country to which a call is made and a country to receive a call when displaying a call charge, and may display a call time and a call charge together.

Hereinafter, a process of determining, by the mobile communication terminal 100, a call time which is the basis of the call charge calculation will be described in detail with reference to FIGS. 8A and 8B.

First, FIG. 8A illustrates a process of calculating a talk time by the calling mobile terminal 100 'when the called party first disconnects the phone after the call.

In the present embodiment, only the signal transmission / reception relationship between the calling mobile terminal 100 'and the base station 310 of the overseas mobile communication network 300 is shown for convenience of description.

First, when there is a call connection command to connect a voice call from the calling mobile communication user (step S72), that is, when the user presses a key button or the like of the mobile communication terminal 100, the calling mobile communication terminal 100 ') Transmits a call connection request signal to the base station 310 (step S73), whereby the base station 310 transmits the call connection request signal to the receiving side and at the same time the ringback tone to the calling mobile terminal 100' The AWIM signal is transmitted to make it ring (step S74).

The calling mobile terminal 100 'outputs the ringback tone to the speaker 160 according to the AWIM signal received from the base station 310 (step S75). In this case, the ringback tone is a signal tone that is heard from the receiver side of the calling mobile terminal 100 ′ to make a call to inform the user that the call connection is in progress.

Subsequently, when an AWIM signal indicating that the other party has received the call is received from the base station 310 (step S76), the calling party mobile communication terminal 100 'performs a call connection process so as to enable a voice call with the other party (step S77). .

If the called party's mobile communication terminal 100 "releases a call while the voice call is in progress, for example, when the call termination button of the called party's mobile communication terminal 100" is pressed, the caller's mobile communication terminal from the base station 310 is pressed. When a release order signal is received at step 100 '(step S78), and the call termination is detected (step S79), the calling mobile terminal 100' transmits a release command signal to the base station 310. (Step S80), and the talk time is calculated (step S81).

At this time, the talk time is calculated by calculating the time from the above step S76 to step S78. That is, the time when the AWIM signal was last received before the call was made was the call start point, and the time when the release command signal was first received from the base station 310 was the call end point. The time until is regarded as the talk time.

By specifying the start time and the end time of the call in the manner described above, the difference between the call time actually calculated by the mobile communication system is reduced as much as possible, and as a result, the call charge displayed on the mobile communication terminal 100 and the actual afterwards. To reduce the error of the call charges.

On the other hand, when the call is terminated first at the calling mobile terminal 100 ', the direction of step S78 is changed so that a release command signal is transmitted from the calling mobile terminal 100' to the base station 310, where the call ends. The time point is a time point at which the first release command is transmitted to the base station 310.

Hereinafter, the process of calculating the call time in the called-party mobile communication terminal 100 "when the caller first disconnects the call after the call will be described with reference to FIG. 8B.

In the present embodiment, like the above-described embodiment, only the signal transmission / reception relationship between the destination side mobile communication terminal 100 ″ and the base station 310 of the overseas mobile communication network 300 is shown.

First, when a call is received from the calling mobile terminal 100 ', the base station performs a communication channel connection with the called mobile terminal 100 "and transmits an AWIM signal (step S86).

The called party's mobile communication terminal 100 "outputs a ringing sound through the speaker 160 to notify the user that a call is being made according to the AWIM signal received from the base station (step S87).

When the user answers the call (step S88), that is, when the user presses the call button, the called-party mobile communication terminal 100 ″ transmits a connect order signal to the base station 310 indicating that the user has received the call. (Step S89), the call is then made (step S90).

When the call is terminated at the calling mobile terminal 100 'while the call is in progress, for example, when the calling user presses the end button, a release order signal is signaled from the base station 310 to notify the call termination. Is received (step S91), and the called-party mobile communication terminal 100 "detects the termination of the call according to the release command (step S92) and then transmits the release command signal to the base station 310 (step S93). Is calculated (step S94).

In calculating the talk time, the called party's mobile communication terminal 100 " sets the time at which the connection command is transmitted to the base station 310 (step S89) to the start of the call, and the time at which the first release command signal is received (step S91). ) At the end of the call, the time from the start of the call to the end of the call is calculated as the call time.

If the user of the called mobile terminal 100 "ends the call by pressing the call termination button, the direction of the first release command signal of step S91 is changed, that is, the base station (from the called mobile terminal 100") is changed. The first release command signal is transmitted to 310, in which case, the first release command signal may be transmitted to the base station 310.

On the other hand, the present invention is not limited to the above specific embodiments, but can be modified and modified in various ways without departing from the gist of the present invention. It will be apparent that such variations and modifications are included in the present invention as long as they belong to the appended claims.

1 is a schematic configuration diagram of an international roaming call charge prompt guidance system according to an embodiment of the present invention;

FIG. 2 is an example of international roaming call rate data transmitted by a domestic mobile communication network server of FIG. 1 to a mobile terminal.

3 is a functional block diagram of a mobile communication terminal of FIG. 1,

4 is a diagram illustrating an example of country information matching data stored in a storage unit of FIG. 3;

5 and 6 is a control flow chart of the international roaming call prompt immediately guide system according to an embodiment of the present invention,

7 is a diagram illustrating an example of displaying a call charge on a screen of the mobile communication terminal of FIG. 6.

8A and 8B are views illustrating a process of calculating an actual call charge in a calling mobile terminal and a called mobile terminal.

* Explanation of symbols for the main parts of the drawings

100: mobile communication terminal 200: domestic mobile communication server

210, 310: Base station 300: Overseas mobile communication network

110: communication interface unit 120: control unit

130: key input unit 140: storage unit

150: display unit 160: speaker

Claims (18)

A domestic mobile communication network server for transmitting international roaming call rate data; An overseas mobile communication network providing an international roaming call service; Store the international roaming call rate data received from the domestic mobile communication network server, calculate the call charges using the talk time and the stored international roaming call rate data when the international roaming call is made through the overseas mobile communication network from abroad An international roaming call prompt prompting system comprising a mobile communication terminal for notifying one user of a call charge. The method of claim 1, The international roaming call rate data includes at least one call rate data for each calling country, The overseas mobile communication network transmits a system parameter message including a system ID to the mobile communication terminal, The mobile terminal includes country information matching data in which country information and system ID are matched, and extracts country information matching the system ID of a system parameter message received from the foreign mobile communication network from the country information matching data. And an international roaming call charge prompt information system, wherein the call rate data of the calling country corresponding to the received country information is read out from the international roaming call rate data. The method according to claim 1 or 2, The international roaming call rate data includes voice call rate data and text message communication rate data separately. When a voice call is made, the mobile terminal calculates a call charge according to the voice call based on the voice call rate data and the call time, and when the text message communication is made, text message communication is performed based on the text message communication rate data. International roaming call charges immediate guidance system, characterized in that for calculating the communication fee according to. The method of claim 3, The voice call rate data includes local call rate data for calling and international call rate data for calling, When the mobile terminal performs call processing by requesting a call connection to the other party's mobile terminal number including the country code, the mobile communication terminal uses international call rate data for outgoing call rate data using the country corresponding to the country code as the destination country. Calculating a call charge and calculating the call charge based on the outgoing local call rate data and the call time when a call connection request is made to a counterpart mobile communication terminal number which does not include a country code. Instant roaming system for international roaming charges. The method according to claim 1 or 2, And the domestic mobile communication network server transmits the international roaming call rate data and the country information matching data to the mobile communication terminal by using over-the-air service provisioning (OTASP). The method according to claim 1 or 2, The mobile communication terminal includes a calling party mobile terminal making a call and a called party mobile communication terminal receiving a call. When a voice call is made through the overseas mobile communication network between the calling mobile terminal and the called mobile terminal, the calling mobile terminal is finally connected to the overseas mobile terminal before the voice call is made with the called mobile terminal. A time for which AWIM (ALERT WITH INFORMATION MESSAGE) is received from a mobile communication network is a call start time, and a RELEASE ORDER is received from the overseas mobile communication network or a RELEASE ORDER is transmitted to the overseas mobile communication network. And the call start time and the call end time interval as a call time using a time as a call end time. The method of claim 6, The called-party mobile communication terminal sets a time when the CONNECT ORDER is transmitted to the overseas mobile communication network as a call start time, and a RELEASE ORDER is received from the overseas mobile communication network or released to the overseas mobile communication network. And the call start time and the call end time interval as a call time using a time for transmitting a command (RELEASE ORDER) as a call end time. In the control method of a domestic mobile communication network server that communicates through a mobile communication terminal and a base station in Korea, an overseas mobile communication network provided abroad, and an international roaming call charge prompt guidance system including a mobile communication terminal, Transmitting, by the domestic mobile communication network server, international roaming call rate data to the mobile communication terminal; When the mobile communication terminal stores the international roaming call rate data received from the domestic mobile communication network server, and changes to the international roaming support state, when the international roaming call is made through the overseas mobile communication network, the talk time and the stored international roaming call A method of controlling an international roaming call charge prompt guidance system, comprising the step of calculating a call charge using rate data and informing a user of the calculated call charge. The method of claim 8, Transmitting, by the domestic mobile communication network server, country information matching data in which country information and system ID are matched to the mobile communication terminal; Storing, by the mobile communication terminal, country information matching data received from the domestic mobile communication network server; Transmitting, by the overseas mobile communication network, a system parameter message including a system ID to the mobile communication terminal; The international roaming call rate data includes at least one call rate data for each calling country, The mobile communication terminal extracts country information matching the system ID of the system parameter message received from the foreign mobile communication network from the country information matching data, and internationally roams the call rate data of the calling country corresponding to the extracted country information. A method for controlling an international roaming call charge prompt guidance system, characterized in that the call charge is calculated from the call rate data. The method according to claim 8 or 9, The domestic mobile communication network server immediately transmits the international roaming call charges system using the over-the-air service provisioning (OTASP) to transmit the international roaming call rate data and the country information matching data to the mobile communication terminal. Control method. A communication interface for communicating with a domestic mobile communication network server and an overseas mobile communication network; A storage unit for storing international roaming call rate data received from the domestic mobile communication network server through the communication interface unit; A display unit displaying an image; When the international roaming call is made through the overseas mobile communication network after the setting is changed to the international roaming support state, the call rate is calculated using the talk time and the international roaming call rate data stored in the storage unit, and the displayed call rate is displayed. A mobile communication terminal for displaying international call charges, characterized in that it comprises a control unit for controlling the unit. The method of claim 11, The storage unit stores the country information matching data matching the country information and system ID, The international roaming call rate data stored in the storage unit includes at least one call rate data for each calling country. The controller extracts a system ID from a system parameter message periodically transmitted from the overseas mobile communication network, extracts country information matching the extracted system ID from the country information matching data, and transmits the corresponding country information. A mobile communication terminal for displaying international call charges, wherein the call charges are calculated using the call rate data of the country and the call duration. The method according to claim 11 or 12, wherein The international roaming call rate data includes voice call rate data and text message communication rate data separately. The controller calculates a call charge according to a voice call based on the voice call rate data and the call time when a voice call is made, and when the text message communication is made, the controller calculates a call charge according to the text message communication rate data. A mobile communication terminal for displaying international call charges, the communication charges being calculated. The method of claim 13, The voice call rate data includes local call rate data for calling and international call rate data for calling, The control unit requests a call to the other party's mobile terminal number that includes the country code and performs call processing based on the call rate based on the international call rate data for calling the country corresponding to the country code and the call time. And calculating the call charge based on the call-out local call rate data and the call time when the call processing is performed by making a call connection request to the counterpart mobile communication terminal number that does not include the country code. Mobile communication terminal to display. The method of claim 11 or 12, And the control unit accumulates and stores the calculated call charge together with the call date in the storage unit. In the control method of the mobile communication terminal to communicate with the domestic mobile communication network server and overseas mobile communication network, Receiving and storing international roaming call rate data from the domestic mobile communication network server; Setting and changing to an international roaming support state; If the international roaming call is made through the overseas mobile communication network to calculate the call charges using the talk time and the stored international roaming call rate data, indicating the international call charges comprising the step of informing the user of the calculated call charges Control method of mobile communication terminal. The method of claim 16, Receiving and storing country information matching data matching country information and system ID from the domestic mobile communication network server; Receiving a system parameter message including a system ID periodically transmitted from the overseas mobile communication network; The international roaming call rate data includes at least one call rate data for each calling country, The mobile communication terminal extracts country information matching the system ID of the system parameter message received from the overseas mobile communication network from the country information matching data, and calculates call rate data and call time of the calling country corresponding to the extracted country information. A method for controlling a mobile communication terminal displaying an international call charge, characterized in that the call charge is calculated using the call charge. The method according to claim 16 or 17, And storing, by the mobile communication terminal, accumulating and storing the calculated call charge together with the call date.

Images