KR20050117900A - Apparatus for full-duflex establishment of push to talk over cellular and method thereof - Google Patents

Abstract

The present invention is to provide an apparatus and method for a PoC client connected to a PoC multi-session in a mobile communication system to properly transmit a call content of a session mainly participated through a duplex session, and a PoC client is currently participating. Requesting the establishment of a duplex session to the home PoC server in order to establish a duplex session, if the contents of the primary participating session are to be delivered to the duplex session; Transmitting and receiving subscriber information between the home PoC server and the group management list server of the home PoC server by using the group list information acquired for establishing the duplex session; And activating the talk burst between the PoC client and the home PoC server, and transmitting the talk burst contents to the PoC server belonging to the duplex session through the home PoC server.

Description

Apparatus for full-duflex establishment of Push To Talk over Cellular and method approximate for full-duplex communication in push-to-talk over cellular system

The present invention relates to a method for enabling full duplex communication in a PoC multiple session, and more particularly, to a method for processing and transmitting a call content of a session mainly attended by a PoC subscriber to a duplex session or a duplex session group.

Due to the revolutionary development of mobile communication and the expansion of communication networks, more expanded and various services and applications using mobile phones are provided. Users' needs are also diversified and are expanding from simple call services to location services, multimedia services, and PTT services. In particular, the PTT service supports various additional functions such as group messenger and voice call, instant messenger, status display, etc., which were conventionally available for radio or TRS.

Currently, the establishment of standards for push-to-talk over cellular (PoC) services that use the PTT (Push To Talk) concept using a mobile communication network is actively discussed. One of the features of the PoC service, which is distinguished from the existing mobile communication service, is that the user belongs to a plurality of sessions, so that the user can make a call while moving between sessions as necessary. The requirement for a user to be able to make calls over multiple sessions is specified in the requirements of the Open Mobile Alliance (OMA), an organization that defines mobile communication services.

Hereinafter, a structure of a general PoC service system will be described.

1 is a conceptual diagram of a general push-to-talk over cellular (PoC) basic structure. Referring to FIG. 1, a PoC client 10 is a service requester embedded in a mobile terminal, and is generally a SIP / IP core (Section Initiation Protocol (SIP) and Internet Protocol (IP) multimedia supporting core network) through an access network 20. core) 30 is connected to the network.

The SIP / IP-based core network is connected to the PoC server 60, the GLMS (Group List and Management System) 50, and the presence server 70 to provide PoC services.

At this time, the PoC server may perform a Controlling PoC Function function for maintaining and managing a PoC session, or a Participating PoC Function for joining a PoC session established for one-to-one or multi-party calls. On the other hand, the structure of the PoC service system requires the management of PoC participating groups and lists to participate in order to open a multi-party session, and the GLMS (50) server that provides these groups and lists and the group management / administration that manages them. 40 includes components.

It also includes a presence server 70 that provides and manages the presence or absence of individuals or groups to provide PoC services. Finally, a remote PoC network 80 expressing another user's SIP / IP core network and PoC server, etc. must be present in order to connect with other users in a person-to-person call or a person-group call in a PoC service.

The PoC system configured as described above allows a PoC user to input information about a group and a group member to the GLMS 40 through his terminal, or to call his or her own through a list of individuals or groups received from the GLMS 40. Know the information of PoC users. Another way to create, modify, and manage groups and group members in GLMS is through a PoC service provider, such as the Internet or an intranet, that can be entered through a trusted communications network.

To use PoC calling service, PoC user registers his PoC address in SIP / IP. At this time, SIP / IP stores information about PoC user based on PoC user's request. When attempting to make a PoC call, the PoC user makes a request to call through the SIP / IP core network and the PoC server based on the information received from the GLMS as described above. At this time, the PoC server retrieves the address of the called party with the requested information and sends a request to the remote PoC server containing the called party's information. Like a PoC server, this remote PoC server searches for a PoC user who needs to receive a call with the information it has and delivers a PoC call.

Hereinafter, a description will be given of a processing method when a media signal is simultaneously transmitted from each session.

2 is a flowchart illustrating a general PoC session establishment procedure.

Referring to FIG. 2, a PoC client B 140 who desires multiple sessions participates in a plurality of PoC sessions using a session participation management unit 120 of a home PoC server to which it belongs. Meanwhile, the talk burst control message for a plurality of sessions conveys idle or taken information about the voice state in each session. At this time, Controlling PoC server X1 (100), Controlling PoC server X2 (110), and Controlling PoC server X3 (130), which are session controllers connected to the session participation management unit (participating PoC Function) 120, respectively, establish an established group or individual PoC session. It performs the function of controlling PoC session controller and establishes session by using the function of Participating PoC Function with other users in each session.

Meanwhile, the PoC client B 140 may simultaneously receive media such as a voice stream from a session established through the Controlling PoC servers 100, 110 and 130 and the SIP / IP core of the session in which the session is participated (S1 ~). S3), the participating Participating PoC server B 120 has a procedure of filtering (S4) incoming media from multiple sessions and selectively transmitting the PoC client B (140) (S5).

At this time, the filtering of the Participating PoC server B 120 managing the client B distinguishes the active participating PoC session and the inactive participating PoC session according to the requirements of the PoC client B, and the media (eg, voice stream) for the active participating PoC session. The packet is forwarded to Client B.

As described above, in the conventional PoC multi-session technique, when a media signal is simultaneously transmitted from each session, the user requests user priority and session locking according to the PoC session requirements. At this time, the Participating PoC function of the PoC server performs filtering on sessions other than the main participation session by using the priority and locking information. That is, the PoC client blocks the packet stream of the unwanted session through the filtering function of the home PoC server and receives only one call through the media. That is, when the PoC client B 140 receives only packets from the Controlling PoC server X1 100 among the three sessions connected, the call content of the other session is discarded or converted or stored in another media to be indirectly received.

As described above, even when a PoC session call user opens multiple sessions, the talk burst can be received and transmitted only for the selected main participant session due to the characteristics of the PoC service itself. That is, the PoC service has only a half-duplex function for the participating session.

Therefore, when talk bursts occur simultaneously in multiple sessions, the group information of the Group and List Management Server (GLMS), which manages multiple sessions according to a user's request, is used to transmit talk bursts between sessions. There is a need for a technique that extends the concept of half duplex in PoC systems.

Accordingly, an object of the present invention is to provide an apparatus and a method for a PoC client connected to a PoC multiple session in a mobile communication system to transmit a call content of a session in which the PoC client mainly participates through a duplex session.

In addition, another object of the present invention is that PoC users participating in a plurality of sessions simultaneously process the received contents when receiving the contents of the call through a specific media channel of the access network and the SIP / IP core network in the main participation session. An object of the present invention is to propose a method and apparatus for delivering to a PoC user of a duplex session through another channel of a back access network and a SIP / IP core network.

A method for establishing a session for full duplex communication of a push-to-talk over cellular system according to the present invention for achieving the above object is to establish a duplex session when a PoC client wants to deliver the contents of a currently participating main session to a duplex session. Requesting to establish a duplex session with the corresponding home PoC server in order to do so; Transmitting and receiving subscriber information between the home PoC server and the group management list server of the home PoC server by using the group list information acquired for establishing the duplex session; And activating the talk burst between the PoC client and the home PoC server, and transmitting the talk burst contents to the PoC server belonging to the duplex session through the home PoC server.

In addition, the method for establishing a session for full-duplex communication of another push-to-talk over cellular system according to the present invention for achieving the above object, the PoC client establishes a session divided into the main participation session and the duplex session according to the purpose of use Doing; And transmitting the talk burst according to the divided session when the talk burst occurs between the PoC client and the home PoC server.

Another method of establishing a session for full duplex communication of a push-to-talk over cellular system for achieving the above object is to establish a duplex session when a PoC client is participating in multiple sessions and converts a subparticipation session into a duplex session. Requesting the establishment of a duplex session with the secondary participant session to the corresponding home PoC server in order to perform the duplex session; Transmitting and receiving subscriber information between the home PoC server and the group management list server of the secondary participant session PoC server by using the group list information acquired for the establishment of the duplex session; And activating the talk burst between the PoC client and the home PoC server, and transmitting the talk burst contents to the subparticipation session PoC server belonging to the duplex session through the home PoC server.

An apparatus for establishing a session for full duplex communication in a push-to-talk over cellular system according to the present invention for achieving the above object comprises: a PoC server belonging to at least one main participant session; PoC server belonging to a duplex session not participating in the current session; And transmits a duplex session establishment request signal to a home PoC server to transmit a talk burst received through a PoC server belonging to a main participant session to a duplex session, and sets up the talk burst when the duplex session is set up. It includes a PoC client that transmits to any PoC server belonging to.

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.

The present invention is a method for enabling full duplex communication in a PoC multisession, and should be able to deliver the contents of a main participant session to a duplex session among multiple PoC sessions. To do this, we first need to distinguish between simultaneous and duplex sessions in multiple sessions. At this time, the connection of each group session is the same as the general PoC session establishment.

3 is a block diagram of an apparatus for establishing a duplex session according to an embodiment of the present invention.

Referring to FIG. 3, a PoC service system according to an embodiment of the present invention includes a home PoC server that is a server to which a PoC client 270, a SIP / IP core network 260, a GLMS 250, and a PoC client 270 belong. 240, PoC servers 210, 220, 230 belonging to Simultaneous session 200, and PoC server X 280 belonging to Duplex session 290.

First, the PoC client 270 registers to the SIP / IP core 260 network by using an address such as a SIP URI via the wireless access network 20 and then connects to its home PoC server 240. At this time, the home PoC server 240 establishes multiple sessions with the PoC servers 210, 220, 230, and 280, which establish a session using a participating PoC function in the server.

The participation management unit of the home server has functions of media relay and media adaptation, SIP session maintenance, and session participant billing report between the user and the server, including handling of the established PoC session.

On the other hand, in the case of a PoC group session or multiple sessions consisting of a plurality of group sessions, the group list management server 250 is used to store and manage user subscription information. GLMS can be directly connected to a home PoC server or can manage subscriber group information over a SIP / IP core network. At this time, the information stored in the GLMS becomes a temporary name used in the PoC session and address information such as the SIP URI of the subscriber.

Meanwhile, a typical PoC multiple session (200) is connected to a session participation management / controller function between servers of multiple PoC group sessions and a home PoC server, and main participation by priority and locking for transmission of a talk burst. The decision of the session and the management of the voice in one session are used to arbitrate the transmission of talk bursts.

At this time, the PoC client 270 may establish a session (called a duplex session) other than the simultaneous session in which the PoC client 270 participates and allocate a channel not used in the current participation session. In this case, the duplex PoC group session 290 may be configured through session control of another PoC server X 280 that does not belong to the simultaneous session.

For example, if PoC client 270 is receiving talk bursts from one group session of simultaneous sessions 200, it may transmit talk bursts for duplex session 290. Here, the Simultaneous session in which the PoC user participates may be one or multiple PoC group sessions and may be an ad-hoc PoC group, a chat PoC group, or a pre-arranged PoC group.

Meanwhile, in FIG. 3, the subject that requests talk burst transmission / reception for the duplex session is generally a PoC client and may be a PoC server in some cases. In addition, when a duplex session is activated, the talk burst of the simultaneous session may be processed or relayed by the user's home PoC server 240 or the PoC client 270.

And, for the burst burst of the duplex session 290, the home PoC server 240 or PoC client 270 can convert and process the media content that can add value, and control the duplex session with the processed content. The PoC server X 280 may transmit / receive.

Hereinafter, a method of establishing a duplex session in the PoC client, processing the data, and transmitting the data to the duplex session subscription group will be described as the first embodiment.

4 is a flowchart illustrating a method for establishing a duplex session in a PoC client for a PoC multiple session according to the present invention. Referring to FIG. 4, the PoC client 310 establishes a simultaneous session through a protocol between PoC servers of a simultaneous session to participate in, a home PoC server, and a GLMS server storing information of group users. In the group session, talk burst authority is granted to a specific user through a talk burst arbitration process (S100).

Accordingly, filtering is performed according to the user's priority and locking setting (S101), and the selected torque burst is transmitted to the user (S110). If a PoC user wants to open a duplex session with another user group for the purpose of transmitting, processing, and selling the received talk burst, first, the home PoC server 306 requests (request) a talk burst deactivate (S111). After receiving the acknowledgment (ACK) signal of the home PoC server 306 (S112), the duplex session initialization procedure is performed (S120).

The duplex session initialization process is the same as the manner in which the home PoC server 306 joins a general session by communicating with the server 312 of another opened PoC session. On the other hand, after the initialization of the duplex session, the PoC client 310 makes a duplex session request (S121), and at this time, PoC server X 312 may give a high priority in arbitration of talk bursts (duplex session is PoC server X Can be divided into PoC group session X).

 The home PoC server 306 and the GLMS server may use the group list information obtained in S120 to distinguish subscribers to deliver a talk burst of a duplex session (S122). The duplex session request message of S121 may include a PoC Client identifier field, a Duplex session subscription list field, a Queue priority field in a Duplex session, and a billing information field.

After the initialization for the duplex session and the subscriber separation procedure of the group session, the PoC client 310 requests and confirms the talk burst again (S123, S124) and talk burst data in the existing simultaneous session transmitted at this time. Is transmitted to the PoC client (S125) and processed (S130).

The processing of the data may be automatically processed by a mechanical conversion device in the PoC client or may be an artificial processing of the user. For example, the English-language talk burst S125 from a simultaneous session may be translated into a Korean interpreter to transmit a duplex talk burst.

The duplex talk burst processed by the PoC user and delivered to the home PoC server (S141) is transmitted to the PoC server X 312, stored in a queue in the server, and then used in a group session controlled by the PoC server X through a talk burst arbitration process. Is delivered to (S142 ~ S144).

Or a high priority is assigned and delivered to the corresponding use in the group session controlled by PoC server X 312 without the normal talk burst arbitration process.

When the duplex session is to be terminated, the PoC user requests a session terminate (S145), and after the duplex session is released between the home PoC server and the PoC server X (S150), the duplex session is terminated. .

Hereinafter, a method of establishing a duplex session in the PoC client and processing the data in the PoC server and transmitting the data to the duplex session subscription group will be described as a second embodiment.

5 is a flowchart illustrating a method for establishing a duplex session in a PoC server for a PoC multiple session according to the present invention.

Referring to FIG. 5, since the establishment of the simultaneous session, the talk burst arbitration, the filtering process, the media deactivation, and the initialization process of the duplex session are the same as the description of FIG. 4, the description thereof is omitted.

After initialization of the duplex session, when the PoC client 310 sends a duplex session request message (S221), the duplex session subscription is performed in the same manner as in FIG. 4 (S222). The request message of S221 may include fields such as PoC Client identifier, Duplex session subscription list, Queue priority in Duplex session, data processing information, and billing information.

In response to the session request of S221, the home PoC server 306 proceeds with the duplex session joining procedure through signaling with the GLMS server (S222) and returns a session join information message (S236). At this time, the PoC client 310 checks the subscriber information of the duplex session to determine whether the duplex session is in progress. After the PoC client requests and confirms the activation of the talk burst (S224, S225), the home PoC server performs the talk burst data processing (S230) according to the needs of the PoC client and manages the processed data in the PoC server X. The transmission to the 312 (S241).

When the home PoC server 306 receives the confirmation message for the duplex talk burst from the PoC server X 312 (S242), the home PoC server 306 returns a duplex session request confirmation message to the PoC client which is the duplex session service requester (S243). Finally, when the PoC client wants to complete the duplex service of the talk burst received in the simultaneous session, the terminated duplex session message is transmitted to the home PoC server 306 (S244) and terminated through the duplex session release (S250). .

According to another embodiment of the present invention, when a PoC client is participating in multiple sessions, a secondary PoC session may be converted into a duplex session. Hereinafter, a method of converting one session of a subparticipation session into a duplex session in the PoC client and transmitting the transmitted talk burst to the duplex session subscription group will be described as a third embodiment.

6 is a flowchart illustrating a method for establishing a duplex session for a PoC multiple session in a PoC server according to the present invention.

In the process of the third embodiment, the establishment of the simultaneous session, the talk burst arbitration, the filtering process, the media deactivation process, etc. are the same as the description of FIG.

After deactivating the talk burst for establishing the duplex session (S312), the PoC client 310 sends a duplex session request message to the home PoC server 306 (S320). At this time, the duplex session is established for the subparticipation session in which the PoC client 310 is already participating. To this end, a duplex session setup process (S321) including a procedure of revising a group session characteristic of an existing PoC group session is performed. The procedure for revising the session group policy and session subscriber information may be a duplex session subscription procedure (S322), and the like, and may selectively configure group members according to the preference of the duplex session service.

Next, after the duplex session group member confirmation result is transmitted to the PoC client 310 (S330), the burst burst is activated and received (S331-S333). At this time, the PoC client transmits the duplex talk burst to the home PoC server 306 after appropriate data processing (S341), and the server manages the duplex session (PoC 2 in the third embodiment as an example: 304). ). When the home PoC server 306 receives the confirmation signal from the server of the duplex session (S343), after returning the duplex session response to the PoC client 310 (S344), the talk burst of the duplex session is terminated by the session termination request (S345). (S350).

Meanwhile, in the present invention, only the case where the DUPLEX session is required as required by the PoC client or the PoC server after the talk burst transmission is described. Unlike the above methods, simultaneous session establishment (S100) and duplex session establishment (S120) are initially performed. After sequential, transmission of talk bursts for the duplex session may be initiated without media deactivate / activate (S111, S112, S123, S124).

In addition, the session in which the user participates may be a one-to-one PoC session, a single PoC group session as well as a simultaneous session, and a target forming a duplex session is not only one PoC group session but also a single PoC client or multiple PoCs depending on the purpose. It can also be a session group.

In addition, the transmission and reception functions of the simultaneous session and the duplex session may be reversely used. That is, there is a method of delivering the received contents of the duplex session to the simultaneous session.

Accordingly, in the present invention, when a PoC client receives a different talk burst signal in a multi-session, it may request its own talk burst after the talk burst ends for a primarily subscribed session. For duplex sessions, we implement the concept of full duplex between sessions that can talk burst independently.

The introduction of such duplex sessions allows the PoC client to send and receive simultaneously by distinguishing between sessions, and it can be a technical background that can be added to other sessions by appropriately adding the value of the talk burst transmitted in the primary participant session.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that the present invention may be modified without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

As described above, according to the present invention, the conventional PoC user makes and receives calls only for the session in which the user participates. At this time, although the voice is obtained through a process of queue and talk burst arbitration, in the present invention, a primary participation session is performed. The user receiving the content of the user can transmit to another session (duplex session) at the same time.

In addition, the content of the primary participant session (simultaneous session) can be appropriately processed by the user and added to the talk burst in the duplex session and transmitted.

And, using a GLMS server, the contents of the duplex session can be selected and transmitted according to a user's intention according to a specific user group.

1 is a conceptual diagram of a general Push-to-talk over Cellular (PoC) basic structure;

2 is a flowchart illustrating a general PoC session establishment procedure;

3 is a block diagram of an apparatus for establishing a duplex session according to an embodiment of the present invention;

4 is a flowchart of a method for performing duplex session talk burst processing in a PoC client for PoC multiple sessions according to the present invention;

5 is a flowchart illustrating a method for performing duplex session talk burst processing in a PoC server for PoC multiple sessions according to the present invention;

6 is a flow diagram of a method for performing duplex session talk burst transmissions with session switching for a PoC multiple session group in accordance with the present invention.

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

200: Simultaneous Session 290: Duplex Session

210: PoC Server 1 220: PoC Server 2

230: PoC Server 3 240: Home PoC Server

250: GLMS 260: SIP / IP Core Network

270: PoC Client 280: PoC Server X

Claims (23)

If the PoC client wants to deliver the content of the currently participating main participant session to the duplex session, requesting the establishment of a duplex session to the corresponding home PoC server to establish the duplex session; Transmitting and receiving subscriber information between the home PoC server and the group management list server of the home PoC server by using the group list information acquired for establishing the duplex session; And After enabling the talk burst between the PoC client and the home PoC server, a method for establishing a session for full-duplex communication of a push-to-talk over cellular system comprising transmitting the talk burst contents to the PoC server belonging to the duplex session through the home PoC server. . The method of claim 1, If a PoC client requests the establishment of a duplex session with a home PoC server to deliver the content of the currently participating main participant session to the duplex session, Talk bursts received from at least one primary participating session are stored in a buffer, the method of establishing a session for full duplex communication of a push-to-talk over cellular system. The method of claim 1, Before performing the step of transmitting the talk burst contents to a PoC server belonging to a duplex session through a home PoC server, A method for establishing a session for full duplex communication of a push-to-talk over cellular system, further comprising the step of processing the talk burst into a data form intended by the PoC client. The method of claim 3, wherein Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system, characterized in that processed by a mechanical conversion device in the PoC client. The method of claim 3, wherein Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system characterized in that the user is artificially processed and delivered in the form of voice. The PoC client establishes a session by dividing the main participation session and the duplex session according to the purpose of use; And A method for establishing a session for full-duplex communication in a push-to-talk over cellular system, comprising transmitting a talk burst according to a divided session when a talk burst occurs between a PoC client and a home PoC server. The method of claim 6, If the PoC client receives talk bursts from at least one or more sessions simultaneously, Talk bursts that can not be delivered to any session in the filtering step is stored in a buffer method for establishing a session for full-duplex communication of the push-to-talk over cellular system. The method of claim 6, Before performing the step of transmitting the talk burst contents to a PoC server belonging to a duplex session through a home PoC server, A method for establishing a session for full duplex communication of a push-to-talk over cellular system, further comprising the step of processing the talk burst into a data form intended by the PoC client. The method of claim 8, Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system, characterized in that processed by a mechanical conversion device in the PoC client. The method of claim 8, Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system characterized in that the user is artificially processed and delivered in the form of voice. If the PoC client wants to deliver the content of the currently participating main participant session to the duplex session, requesting the establishment of a duplex session to the corresponding home PoC server to establish the duplex session; Transmitting / receiving subscriber information between the home PoC server and any PoC server belonging to the duplex session by using the group list information obtained for establishing the duplex session; And After enabling talk burst between PoC client and home PoC server, establishing talk burst for full-duplex communication of push-to-talk over cellular system including transmitting talk burst contents from home PoC server to any PoC server belonging to duplex session. Way. The method of claim 11, If a PoC client requests the establishment of a duplex session with a home PoC server to deliver the content of the currently participating main participant session to the duplex session, Talk bursts received from at least one primary participating session are stored in a buffer, the method of establishing a session for full duplex communication of a push-to-talk over cellular system. The method of claim 11, Before performing the step of transmitting the talk burst content from a home PoC server to a PoC server belonging to a duplex session, The home PoC server further comprises the step of processing the talk burst in the form of data corresponding to the subscription information initially set in the PoC client session establishment for full-duplex communication of the push-to-talk over cellular system. The method of claim 13, Processing the torque burst in the home PoC server, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system, characterized by being processed by a mechanical conversion device in a home PoC server. When the PoC client is participating in multiple sessions and converts the secondary participation session into a duplex session, requesting a duplex session with the secondary participation session to the corresponding home PoC server to establish a duplex session; Transmitting and receiving subscriber information between the home PoC server and the group management list server of the secondary participant session PoC server by using the group list information acquired for the establishment of the duplex session; And After enabling talk burst between the PoC client and the home PoC server, transmitting the talk burst contents to the secondary participant session PoC server belonging to the duplex session through the home PoC server for full duplex communication of the push-to-talk over cellular system. How to open a session. The method of claim 15, If a PoC client requests the establishment of a duplex session with the home PoC server to deliver the content of the currently participating session to the secondary participating session within the session, Talk bursts received from at least one primary participating session are stored in a buffer, the method of establishing a session for full duplex communication of a push-to-talk over cellular system. The method of claim 15, Before performing the step of transmitting the talk burst content through the home PoC server to the secondary participation session, A method for establishing a session for full duplex communication of a push-to-talk over cellular system, further comprising the step of processing the talk burst into a data form intended by the PoC client. The method of claim 15, Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system, characterized in that processed by a mechanical conversion device in the PoC client. The method of claim 15, Processing the talk burst in the form of data intended by the PoC client, Method for establishing a session for full-duplex communication of a push-to-talk over cellular system characterized in that the user is artificially processed and delivered in the form of voice. A PoC server belonging to at least one primary participating session; PoC server belonging to a duplex session not participating in the current session; And The duplex session establishment request signal is sent to the home PoC server to transmit the talk burst received through the PoC server belonging to the main participating session to the duplex session, and when the setup is performed to establish the duplex session, the talk burst is transmitted to the duplex session. An apparatus for establishing a session for full-duplex communication of a push-to-talk over cellular system including a PoC client transmitting to an arbitrary PoC server. The method of claim 20, Push-to-talk over cellular system characterized in that when transmitting a burst burst to any PoC server belonging to the duplex session, if it is determined that the talk burst requires data processing, it is transmitted after the data processing is performed in the PoC client or home PoC server Session establishment device for full-duplex communication. The method of claim 20, wherein the data processing, Session establishment apparatus for full-duplex communication of a push-to-talk over cellular system, characterized in that processed by the mechanical conversion device in the PoC client or home PoC server. The method of claim 20, wherein the data processing, Session establishment apparatus for full-duplex communication of a push-to-talk over cellular system, characterized in that the user artificially processed and transmitted in the form of voice.