KR20040004972A - Cellular communication system for conference call function and service method thereof - Google Patents

Abstract

PURPOSE: A cellular communication system for a conference call function and a service method therefor are provided so that a user who wants a conference call can make a phone call with many desired persons at one call connection attempt. CONSTITUTION: A cellular communication system for a conference call function consists of an MS(Mobile Station)(110), a BTS(Base Transceiver Subsystem)(120), a BSC(Base Station Controller)(130), an MSC(Mobile Switching Center)(140), an HLR(Home Location Register)(150), an AC(Accounting Center)(160), a conference call DB server(170), and the Internet(180). For the conference call function, the user of the MS(110) dials a preappointed special number with a selection number to select one among previously reserved groups. If the preappointed special number is dialed together with the selection number from the MS(110), the MSC(140) recognizes them as a conference call request message and provides the whole call path between the caller and called subscribers of a conference call, based on the location information of reserved group subscribers provided from the HLR(150) or the conference call DB server(170). The HLR(150) having a conference call authentication function field executes a conference call authentication function in response to a conference call authentication request from the MSC(140).

Description

Cellular communication system for conference call function and its service method {CELLULAR COMMUNICATION SYSTEM FOR CONFERENCE CALL FUNCTION AND SERVICE METHOD THEREOF}

The present invention relates to a cellular communication system for a conference call function and a service method thereof, and more particularly to a conference call that allows a user who wants to make a conference call to make a call with a number of people who want to make a call. A service method and a cellular communication system for performing the same.

A conference call is a service that provides a multi-party call path when a conference call or several people want to call at once. For a conference call in a conventional cellular communication system, after making a conference call to a subscriber who wants to make a conference call, You can put the call on hold and call the next subscriber again to start the meeting with the end subscribers calling.

According to the related art, a cellular communication system for providing a conference call function includes a mobile station (MS) 10, a base station transceiver subsystem (BTS) 20, as shown in the configuration diagram of FIG. Base Station Controller (BSC) 30, Mobile Switching Center (MSC) 40, Home Location Register (HLR) 50, Accounting Center (AC) 60 It consists of

The mobile terminal 10 is a terminal which a person can carry and communicate freely, and is within a range of an arbitrary base station 20, and the information of the mobile terminal 10 is a base station 20 and a base station controller for controlling the same. It is transmitted to the switch 40 via the 30, the information transmitted from the switch 40 is transmitted to the mobile terminal 10 via the base station 20 and the base station controller 30.

The base station 20 connects the mobile terminal 10 to the base station controller 30, and includes a digital channel unit (DCU), a timing / frequency control unit (TCU), and a radio frequency device. (Radio Frequency Unit; RFU), Global Positioning System (GPS), and the like.

In addition, the base station 20 performs a wired / wireless conversion function of communicating with the mobile terminal 10 via wireless and communicating with the base station controller 30 by wire.

The base station controller 30 connects the base station 20 to the switch 40 to coordinate the connection between the base stations 20, supports a plurality of base stations 20, and communicates between the base station 20 and the switch 40. It functions as a signal processing for.

The exchange 40 connects a call when the subscriber of the mobile phone makes or receives a call. The switch 40 connects to the base station controller 30 to perform a call setup and release function of the mobile terminal 10. It performs various functions related to and performs interworking function with other networks.

The home location register 50 is a database that stores permanent information of the mobile terminal 10 and subscribers, location information, and additional service information, and interacts with the exchange 40 and the visitor location register (not shown). It performs various functions related to call processing and supplementary services and controls services.

Usually there can be multiple home location registers 50 in one service network, one home location register 50 can be connected to one or more exchanges 40 and visitor location registers, and one exchange ( 40 may be connected to a plurality of base station controller 30, a single base station controller 30 may be connected to a plurality of base stations 20.

A process of providing a conference call service in the cellular communication system configured as described above will be described with reference to the signal flowchart of FIG. 2. In the following description, the signal flow via the base station 20 and the base station controller 30 in the message transfer process between the mobile terminal 10 and the switch 40 is omitted.

First, when the caller dials the first telephone number to which the conference call is desired using the mobile terminal 10 held by the caller, the call request message for the corresponding telephone number is transferred to the switch 40 (S1).

The exchange 40 requests the home location register 50 to confirm the location of the call requesting subscriber in order to connect to the call requesting subscriber from the mobile terminal 10 (S2).

The home location register 50 searches the subscriber information DB to read the current location of the subscriber and transmits the subscriber location information in response to the subscriber location request message from the switch 40 (S3).

The exchange 40 allocates a call path between the caller and the called party based on the subscriber location information received from the home location register 50 and connects the call (S4).

The caller dials the second telephone number to which the conference call is desired in the call connection state with the first subscriber, and a call request message for the telephone number is transferred to the switch 40 (S5 to S6).

The exchange 40 checks the location of the second call requesting subscriber for the call connection with the second call requesting subscriber from the mobile terminal 10 in a state of waiting without disconnecting the call between the first called party and the caller. The home location register 50 is requested to give (S7).

The home location register 50 searches the subscriber information DB to read the current location of the second subscriber, and transmits the subscriber location information in response to the subscriber location request message from the switch 40 (S8).

The exchange 40 allocates a call path between the caller and the second called party based on the location information about the second subscriber received from the home location register 50, and connects the call, and answers the call from the second subscriber (the called party). It provides to the caller (S9).

The individual call connection process as described above is repeated as many times as the caller dials for the conference call (S11 to S13). Of course, the maximum number of called parties that can be connected to a conference call may be appropriately limited.

If a call path is established with all called parties requested by the caller, the caller is placed in the entire call connection state, and the caller and the various callees may use the conference call function at step S14.

As described above, according to the cellular communication system and the service method for the conference call function according to the prior art, it is troublesome to try to connect the call as many times as the number of subscribers who wish to make the conference call for the conference call connection. Able to know.

Moreover, if the connection is lost due to a misoperation during multiple call connection attempts, there is an inconvenience, such as a retry from the beginning. Excessive time-lapse until the final call connection and all conference call participants are waiting for the final connection. There was a problem such as to be in.

The present invention has been proposed to solve such a conventional problem, a conference call service method that allows a user who wants a conference call to make a call with a large number of people who wants to make one call connection attempt and cellular for performing the same. The purpose is to provide a communication system.

In one aspect of the present invention for realizing the above object, the cellular communication system for the conference call function includes a special number which is selected in advance and a selection number which selects one of a group reserved in advance when the conference call function is selected. A mobile terminal for dialing, an authentication function field for the conference call, a reserved called party group preset by the subscriber, subscriber number information of the called party group and subscriber location information are stored, and an authentication request message for the conference call is stored. A home location register for outputting a conference call authentication completion message according to a search result of a conference call authentication function field and outputting a corresponding subscriber list and location information of the corresponding subscriber in response to a subscriber list request message of the called party group; The special number and the selection number from the mobile terminal When dialed, it is recognized as the conference call request message and transmits an authentication request message for the conference call to the home location register, and transmits the subscriber list request message to the home location register according to the conference call authentication completion message. And a switch that provides the entire channel between the conference call originator and the called party based on the subscriber list and the location information of the subscriber.

In another aspect of the present invention, a conference call service method of a cellular communication system includes a conference call when a selection number for selecting one of a predetermined number and a group reserved in advance for selecting a conference call function from a mobile terminal is dialed. A first step of recognizing a request message, a second step of retrieving and extracting subscriber information for each conference group set to obtain subscriber number information for the reserved called party group selected by the caller, and presenting the extracted subscriber The third step of reading the pre-stored subscriber location information to determine the location, and attempts to connect the call by allocating a call path between the caller and the reservation called party based on the location information of the subscribers belonging to the reservation called party list A fourth step is included.

1 is a block diagram of a cellular communication system according to the prior art,

2 is a signal flow diagram of a conference call service according to the prior art;

3 is a block diagram of a cellular communication system according to a first embodiment of the present invention;

4A is a data structure diagram stored in a home location register in a cellular communication system in accordance with the present invention;

4b is a data structure diagram stored in a conference call DB server in a cellular communication system according to the present invention;

5 is a signal flow diagram of a conference call service according to a first embodiment of the present invention;

6 is a block diagram of a cellular communication system according to a second embodiment of the present invention;

7 is a signal flow diagram of a conference call service according to a second embodiment of the present invention;

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

110: mobile terminal 120: base station

130: base station controller 140, 240: switchboard

150: home location register 160: billing center

170: conference call DB server 180: Internet

245: answering machine

There may be a plurality of embodiments of the present invention. Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. This embodiment allows for a better understanding of the objects, features and advantages of the present invention.

A key technical aspect of the present invention is to provide a conference call authentication function to a home location register and to implement a home location register or a DB server for conference calls to designate a called party group for each subscriber. The information of the home location register or the DB server for conference call can be modified by accessing the Internet through the Internet so that the subscriber can easily modify or change the information through the WAP.

The exchange performs call connection simultaneously according to the subscriber's group list of subscribers received from the home location register or DB server for conference calls.In this case, the exchange is charged according to the number of call connections connected to the recipient list in addition to the existing charge function of the exchange. The information is sent to the charging center.

<First Embodiment>

According to the first embodiment of the present invention, a cellular communication system for providing a conference call function includes a mobile station (MS) 110 and a base station transceiver subsystem (BTS), as shown in the configuration diagram of FIG. 3. 120, Base Station Controller (BSC) 130, Mobile Switching Center (MSC) 140, Home Location Register (HLR) 150, Accounting Center AC) 160, the conference call DB server 170, and the Internet 180.

The mobile terminal 110 is a terminal which a person can carry and communicate freely, and is within the range of an arbitrary base station 120, and when selecting a conference call function, any one of a predetermined special number and a group reserved in advance Dialing a selection number for selecting one together, the information of the mobile terminal 110 is transmitted to the exchange 140 via the base station 120 and the base station controller 130 controlling it, and transmitted from the exchange 140 The information is transmitted to the mobile terminal 110 via the base station 120 and the base station controller 130.

The base station 120 connects the mobile terminal 110 to the base station controller 130, and includes a digital channel unit (DCU), a timing / frequency control unit (TCU), and a radio frequency device. (Radio Frequency Unit; RFU), Global Positioning System (GPS), and the like.

In addition, the base station 120 performs a wired / wireless conversion function of communicating wirelessly with the mobile terminal 110 and communicating with the base station controller 130 by wire.

The base station controller 130 connects the base station 120 to the exchange 140 to coordinate the connection between the base stations 120, supports a plurality of base stations 120, and communicates between the base station 120 and the exchange 140. It functions as a signal processing for.

The exchanger 140 connects a call when the mobile subscriber makes or receives a call, connects with the base station controller 130, performs a call setup and release function of the mobile terminal 110, and handles and processes a call. It performs various functions related to and performs interworking function with other networks. When the mobile terminal 110 is dialed together with a special number pre-appointed from the mobile terminal 110 and a selection number for selecting one of the reserved groups is recognized as a conference call request message, the home location register 150 or the conference call DB server 170 Provides the entire call path between the conference call originator and the called party based on the location information of the reservation group subscriber provided from

The home location register 150 is a database that stores permanent information of the mobile terminal 110 and subscribers, location information, and additional service information, and interacts with the exchange 140 and the visitor location register (not shown). It performs various functions related to call processing and supplementary services and controls services. The home location register 150 has a conference call authentication function field and authenticates whether to provide the conference call function in response to the conference call authentication request from the exchange 140.

The conference call DB server 170 stores the reserved called party group and subscriber number information of the corresponding called party group, which are preset by the subscriber for the conference call function, and user interface for changing conference call information through the Internet 18 or WAP. To provide.

The billing center 160 receives the billing information based on the subscriber number information connected by the switch 140 in the reserved called party group connected to the conference call from the switch 140 and charges the communication fee according to the number of the corresponding call connections.

In the above, an example of establishing a separate conference call DB server 170 for storing the called party group information and the subscriber number information has been described. However, the called party group information and the subscriber number information may be stored in the home location register 150. In this case, the conference call DB server 170 may be omitted.

There may be a plurality of home location registers 150 and conference call DB servers 170 in one service network, and one or more exchangers 140 in one home location register 150 and conference call DB servers 170. And visitor location registers may be connected, and a plurality of base station controllers 130 may be connected to one exchange 140, and a plurality of base stations 120 may be connected to one base station controller 130. Can be.

A process of providing a conference call service in the cellular communication system according to the first embodiment of the present invention configured as described above will be described with reference to the signal flowchart of FIG. 5. In the following description, the signal flow through the base station 120 and the base station controller 130 is omitted in the message transfer process between the mobile terminal 110 and the switch 140.

First, a subscriber who wishes to provide a conference call service accesses a user interface provided by the conference call DB server 170 through a mobile terminal 110 or the Internet 180, and reserves a called party group and a corresponding group. Register subscriber number belonging to, and apply for service of conference call through ARS or counselor of customer center.

Then, the conference call service authentication information is generated in the conference call authentication function field of the home location register 150 as shown in FIG. 4A, and the subscriber call information for each conference group is stored in the conference call DB server 170 as shown in FIG. 4B.

Then, when the caller selects the conference call function, the mobile terminal 110 dials a selection number for selecting one of a pre-appointed special number and a group reserved in advance (S101). For example, the conference call special number * 87 and the group selection number 1 are successively dialed.

The exchanger 140 recognizes the conference call request message when the tone signal is transmitted from the mobile terminal 110, and receives the conference call authentication request message to verify that the subscriber is a registered subscriber to the conference call service. Transfer to (S102).

The home location register 150 searches the conference call authentication field of the subscriber information DB to determine whether the caller who has requested the current conference call is a registered subscriber, and authenticates the conference call in response to the conference call authentication request message from the exchange 140. The completion message is transmitted (S103).

When the conference call is authenticated from the home location register 150, the exchange 140 transmits a corresponding group caller list request message to the conference call DB server 170 so as to obtain subscriber number information for the reserved called party group selected by the caller. (S104). If a group is selected by the caller, the group 1 caller (reserved caller) list request message is transmitted.

When the conference call DB server 170 receives the reserved called party list request message from the exchange 140, the conference call DB server 170 searches for the subscriber information for each conference group and transmits the extracted subscriber information, that is, the corresponding group caller list to the exchange 140 ( S105).

The exchange 140 transmits the subscriber location request message to the home location register 150 to determine the current location of the subscriber when the subscriber information belonging to the group is transferred from the conference call DB server 170 (S106).

The home location register 150 searches the subscriber information DB to read the current location of the corresponding subscribers, and transmits the subscriber location information in response to the subscriber location request message from the exchange 140 (S107).

The exchange 140 attempts to connect the call by allocating a call path between the caller and the corresponding reserved recipient based on the location information of the subscribers included in the reserved called party list received from the home location register 150 (S108). When a call answering signal is received from the callers, the call answering signal is individually connected in sequence according to the arrival order of the call answering signal to provide the overall call connection status for the called party, thereby allowing the caller and the plurality of called parties to use the conference call function (S109). S110).

Second Embodiment

According to the second embodiment of the present invention, a cellular communication system for providing a conference call function includes a mobile station (MS) 110 and a base station transceiver subsystem (BTS), as shown in the configuration diagram of FIG. 6. 120, Base Station Controller (BSC) 130, Mobile Switching Center (MSC) 240, Automatic Response System (ARS) 245, Home Location Register (Home Location) Register (HLR) 150, Accounting Center (AC) (160), the conference call DB server 170, the Internet 180 is composed of.

In the cellular communication system according to the second embodiment illustrated in FIG. 6, the same components as those of the cellular communication system illustrated in FIG. 3 are denoted by the same reference numerals for clarity, and the description thereof will be omitted below. do.

The exchanger 240 connects a call when the mobile subscriber makes or receives a call. The switch 240 connects with the base station controller 130 to perform a call setup and release function of the mobile terminal 110, and performs call processing and additional services. It performs various functions of and performs interworking with other networks. When the mobile terminal 110 is dialed together with a special number pre-appointed from the mobile terminal 110 and a selection number for selecting one of the pre-booked groups, the mobile terminal 110 recognizes the conference call request message. Based on the location information of the reservation group subscriber provided from the home location register 150 or the conference call DB server 170, the entire call path between the conference call sender and the called party is provided.

The answering machine 245 requests a corresponding group caller (reserved caller) list from the home location register 150 or the conference call DB server 170 according to the conference call connection request of the exchange 240, and the group caller list. On the basis of the request to the exchange 240 to the call of the group members.

The second embodiment of the present invention has been described as an example of constructing a separate conference call DB server 170 to store the called party group information and the subscriber number information as in the first embodiment, but the called party group information and the subscriber number The information may be stored in the home location register 150, in which case the conference call DB server 170 may be omitted.

A process of providing a conference call service in the cellular communication system according to the second embodiment of the present invention configured as described above will be described with reference to the signal flowchart of FIG. 7. In the following description, the signal flow through the base station 120 and the base station controller 130 in the message transfer process between the mobile terminal 110 and the switch 240 is omitted.

First, a subscriber who wishes to provide a conference call service accesses a user interface provided by the conference call DB server 170 through a mobile terminal 110 or the Internet 180, and reserves a called party group and a corresponding group. Register subscriber number belonging to, and apply for service of conference call through ARS or counselor of customer center.

Then, the conference call service authentication information is generated in the conference call authentication function field of the home location register 150 as shown in FIG. 4A, and the subscriber call information for each conference group is stored in the conference call DB server 170 as shown in FIG. 4B.

Then, when the caller selects the conference call function, the mobile terminal 110 dials a selection number for selecting one of a predetermined special number and a group reserved in advance (S201). For example, the conference call special number * 87 and the group selection number 1 are successively dialed.

The exchange 240 recognizes the conference call request message when the tone signal is transmitted from the mobile terminal 110, and receives the conference call authentication request message to verify that the subscriber is a registered subscriber to the conference call service. In step S202.

The home location register 150 searches the conference call authentication function field of the subscriber information DB to determine whether the caller who has requested the current conference call is a registered subscriber and authenticates the conference call in response to the conference call authentication request message from the exchange 240. The completion message is transmitted (S203).

The exchange 240 transmits the conference call connection request message to the answering machine 245 when the conference call is authenticated from the home location register 150. In other words, when a group is selected by the caller, the group conference call connection request message is transmitted (S204).

The answering machine 245 conferences the group caller list request message to the conference call DB server 170 to obtain subscriber number information for the reserved called party group selected by the caller when the connection request message of the exchange 240 is received. The transmission to the DB server 170 (S205). If a group is selected by the caller, the group 1 caller (reserved caller) list request message is transmitted.

When the conference call DB server 170 receives the reserved callee list request message from the answering machine 245, the conference call DB server 170 searches for the subscriber information for each conference group and transmits extracted subscriber information, that is, the group caller list to the answering machine 245. (S206).

When the answering machine 245 transmits subscriber information belonging to the corresponding group from the conference call DB server 170, the answering machine 245 requests the call connection for N group members belonging to the corresponding group while transferring it to the exchange 240 (S207).

The exchange 240 transmits a subscriber location request message to the home location register 150 to determine the current location of the subscribers in response to the call connection request by the answering machine 245 (S208).

The home location register 150 searches the subscriber information DB to read the current location of the corresponding subscribers, and transmits the subscriber location information in response to the subscriber location request message from the exchange 240 (S209).

The exchange 240 attempts to connect the call by allocating a call path between the caller and the reservation called party based on the location information of the subscribers belonging to the reservation called party list received from the home location register 150 (S210). When a call answering signal is received from the callers, the call answering signals are individually connected in sequence according to the arrival order of the call answering signals, thereby providing the overall call connection state for the reserved called party. S212).

In the above description, but limited to the embodiment of the present invention, it is obvious that the technology of the present invention can be easily modified by those skilled in the art.

For example, a reservation called party group and a subscriber number belonging to the group who want to receive conference call service can be registered and corrected by an agent of the customer center or registered by the subscriber according to a predetermined procedure based on an ARS voice prompt. And can be modified. In addition, as mentioned above, when the function of the conference call DB server is integrated into the home location register, the message exchange procedure between the exchange (or answering machine) and the conference call DB server is performed in the above service process. And between the home location register. It may also be used in combination with the conventional conference call function described in the prior art, wherein the conference call function of the present invention may be distinguished as an emergency conference call function.

Such modified embodiments should be included in the technical spirit described in the claims of the present invention.

As described above, the present invention not only increases the convenience of allowing a user who wants to make a conference call to make a call with a large number of people who want to make a call, but also saves user time.

Claims (8)

A mobile terminal for dialing a selection number for selecting one of a pre-appointed special number and a pre-scheduled group when selecting a conference call function; The authentication function field for the conference call, the reserved called party group preset by the subscriber, the subscriber number information of the called party group, and the location information of the subscriber are stored. When the authentication request message for the conference call is input, the conference call authentication function field is entered. A home location register that outputs a conference call authentication completion message and outputs a corresponding subscriber list and location information of the corresponding subscriber in response to the subscriber list request message of the called party group; When the special number and the selection number are dialed together from the mobile terminal, the mobile terminal recognizes the conference call request message and transfers the authentication request message for the conference call to the home location register. The subscriber list is based on the conference call authentication completion message. A cellular communication system for a conference call function comprising a switch for delivering a request message to the home location registrar and providing the entire call path between the conference call originator and the called party based on the subscriber list and the location information of the subscriber; . A mobile terminal for dialing a selection number for selecting one of a pre-appointed special number and a pre-scheduled group when selecting a conference call function; The authentication function field for the conference call is stored, when the authentication request message for the conference call is input, a conference call authentication completion message is output according to a search result of the conference call authentication function field, and a subscriber information request message of the called party group is provided. A home location register for outputting location information of the subscriber in response to the; A conference call DB server configured to store the reserved called party group previously set by the subscriber and subscriber number information of the called party group, and output the corresponding subscriber list in response to the subscriber list request message of the called party group; When the special number and the selection number are dialed together from the mobile terminal, the mobile terminal recognizes the conference call request message and transfers the authentication request message for the conference call to the home location register. The subscriber list is based on the conference call authentication completion message. Cellular communication for a conference call function comprising a switch that delivers a request message to the conference call DB server and provides the entire call path between the conference call sender and the called party based on the subscriber list and the location information of the subscriber. system. A mobile terminal for dialing a selection number for selecting one of a pre-appointed special number and a pre-scheduled group when selecting a conference call function; The authentication function field for the conference call, the reserved called party group preset by the subscriber, the subscriber number information of the called party group, and the location information of the subscriber are stored. When the authentication request message for the conference call is input, the conference call authentication function field is entered. A home location register that outputs a conference call authentication completion message according to a search result and outputs a corresponding subscriber list and location information of the corresponding subscriber in response to a subscriber list request message and a subscriber location information request of the called party group; When the special number and the selection number are dialed together from the mobile terminal, the mobile terminal recognizes the conference call request message and transfers an authentication request message for the conference call to the home location register, and connects the conference call according to the conference call authentication completion message. Generate a request message, request the home location register for location information of the called party group subscriber based on the group member call connection request message, and transfer the entire call between the conference call sender and the called party based on the location information of the group subscriber. With exchanger to provide, An answering machine for transmitting the subscriber list request message to the home location registrar according to the conference call connection request message, and generating the group member call connection request message while forwarding the subscriber list request from the home location registrar to the exchange. Cellular communication system for a conference call function comprising a. A mobile terminal for dialing a selection number for selecting one of a pre-appointed special number and a pre-scheduled group when selecting a conference call function; The authentication function field for the conference call is stored, when the authentication request message for the conference call is input, a conference call authentication completion message is output according to a search result of the conference call authentication function field, and a subscriber information request message of the called party group is provided. A home location register for outputting location information of the subscriber in response to the; A conference call DB server configured to store the reserved called party group previously set by the subscriber and subscriber number information of the called party group, and output the corresponding subscriber list in response to the subscriber list request message of the called party group; When the special number and the selection number are dialed together from the mobile terminal, the mobile terminal recognizes the conference call request message and transfers an authentication request message for the conference call to the home location register, and connects the conference call according to the conference call authentication completion message. Generate a request message, request the home location register for location information of the called party group subscriber based on the group member call connection request message, and transfer the entire call between the conference call sender and the called party based on the location information of the group subscriber. With exchanger to provide, An answering machine for transmitting the subscriber list request message to the home location registrar according to the conference call connection request message, and generating the group member call connection request message while forwarding the subscriber list request from the home location registrar to the exchange. Cellular communication system for a conference call function comprising a. The method according to any one of claims 1 to 4, And a billing center that receives billing information based on subscriber number information connected by the exchange in the reservation called party group to which the conference call is connected, and charges a communication fee according to the number of the corresponding call connections. Cellular communication system. The method according to any one of claims 1 to 4, Registering and modifying the reserved called party group and subscriber number belonging to the group to be connected to the user interface provided by the conference call DB server or a home location register via the mobile terminal or the Internet. Cellular communication system for conferencing. A first step of recognizing a conference call request message when a selection number for selecting one of a pre-appointed special number and a predetermined group is dialed to select a conference call function from a mobile terminal; A second step of retrieving and extracting subscriber information for each predetermined conference group to obtain subscriber number information for the reserved called party group selected by the caller; A third step of reading previously stored subscriber location information to determine the extracted current location of the corresponding subscriber; And a fourth step of allocating a call path between the caller and the called party based on the location information of the subscribers included in the reserved called party list and attempting to connect the call. The method of claim 7, wherein If the conference call request message is recognized in the first step, search the previously stored conference call authentication function field to check whether the caller who has requested the current conference call is a registered subscriber, and selectively perform the second step according to the result. A conference call service method of a cellular communication system, characterized by the above-mentioned.