KR20070104079A - System and method of group call capable of setting up temporary session between communication devices - Google Patents

Abstract

A system and a method for providing a group call for mobile terminals capable of setting up a temporary session are provided to enable a temporary call service to be implemented just between specific users in the middle of a group call in order to prevent secret information from being exposed to other users. A system for providing a group call for mobile terminals capable of setting up a temporary session comprises a SIP(Session Initiation Protocol) server(210) and a PoC(Push to talk over Cellular) server(220). If the first terminal(205) among more than three terminals, which is in the middle of a group call, transmits a temporary session request message to execute a temporary call to the second terminal(206), the SIP server(210) makes a session setup message and sends it to the PoC server(220). When receiving the session setup message, the PoC server(220) makes a response message and sends it to the SIP server(210). Based on the response message, the SIP server(210) sets up a temporary session between the first terminal(205) and the second terminal(206) so that a temporary call can be executed just between the two terminals(205,206).

Description

SYSTEM AND METHOD OF GROUP CALL CAPABLE OF SETTING UP TEMPORARY SESSION BETWEEN COMMUNICATION DEVICES}

1 is a diagram illustrating a group call between terminals using a general PoC.

2 is a view for explaining a PoC group call according to an embodiment of the present invention.

3 is a flowchart for describing an operating method of the configuration module of FIG. 2.

4 is a diagram for explaining a PoC group call according to another embodiment of the present invention.

5 is a flowchart for describing an operating method of the configuration module of FIG. 4.

<Explanation of symbols for main parts of the drawings>

200: group call providing system

201: Group & List Management Server (GLMS)

202: GLMS management department

203: presence server

204: access network

205: first terminal

206: second terminal

207: Group session

208: ad hoc session

210: SIP server

220: PoC server

The present invention relates to a system for providing a group call, and more particularly, a temporary call only between specific users by establishing a temporary session between specific terminals among at least three terminals having a group call using Push to talk Over Cellular (PoC). Relates to a possible group call providing system and method.

Push-to-Talk (PTT or P2T) was originally introduced by the US operator's iDEN technology and started to standardize in the PoC working group of the Open Mobile Alliance (OMA) standardization organization. Talk over Cellular). These PoCs are now recognized by many mobile operators as important services for transmitting and receiving video and other multimedia data as well as voice.

PoC is a technology that provides group call service to users by sending and receiving voice packets one-to-many in mobile communication network using VoIP (Voice over IP, voice packet network) technology. The protocol used for the POC is basically a Session Initiation Protocol (SIP), which negotiates to create a session that can send and receive voice or other media data using SIP.

1 illustrates a general PoC service system 100 for explaining a group call between terminals using a general PoC.

Referring to FIG. 1, a PoC client 101 is a service requester embedded in a user terminal and is connected to a SIP / IP server 103 through an access network 102. At this time, the PoC client 101 enables the user terminal to access the PoC service. That is, the PoC client 101 not only provides a function of creating and terminating a group session on the user side, but also supports a function of creating and delivering a talk burst and an instant personal alert. Functions such as function and authentication function.

The SIP-based SIP / IP server 103 is connected to the PoC server 106, the Group List and Management System (GLMS) 105, and the presence server 107 to provide a service to support group calls through the PoC. . At this time, the PoC server 106 performs a Controlling PoC Function function for maintaining and managing a group session, or has a function such as Participating PoC Function for joining a PoC session established for one-to-many call. In addition, the PoC service system 100 needs to manage the PoC participating groups and lists to participate in a group call in order to open a multi-party group session, and the GLMS 105 which provides such groups and lists and the GLMS performing the management thereof. The management unit 104 is included. It also includes a presence server 107 that provides and manages the presence or absence of individuals or groups to provide PoC services, and for the communication between three or more individuals or individual-group calls in the PoC service, There must be a remote PoC network 108 connecting the PoC server or the like.

The general PoC service system 100 configured as described above may allow a user to input information about a group and a group member to the GLMS 105 through his terminal, or through a list of individuals or groups received from the GLMS 105. You can see information about other users you can call.

The conventional PoC service system 100 provides a group call service to at least three or more users through a group session established once. However, in the conventional PoC service system 100, when a specific user wants a one-to-one call with another specific user during a group call, the PoC service system 100 may not provide a service for this. Recently, users who are familiar with messenger services through the Internet are familiar with one-to-one communication services such as word input and secret text input. In order to satisfy the needs of these users, the conventional PoC system 100 is not only a group call but also a group call. It is necessary to provide one-to-one call service.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a group call providing system that provides one-to-one call service between specific users during a group call.

Another object of the present invention is to provide a group call method for providing a secret call service between a specific user among a plurality of users performing a group call using a PoC through a circuit network or a packet network. do.

In order to achieve the above object and to solve the above-mentioned problems of the prior art, the group call providing system according to the present invention is a second terminal of the at least three or more terminals from a first terminal of at least three or more terminals having a group call Receives a temporary session request message transmitted for a temporary call with the mobile station, generates a session establishment message, and sets a temporary session between the first terminal and the second terminal according to a predetermined response message; SIP server for controlling a temporary call only between, and a PoC server generating the predetermined response message according to the session establishment message and responds to the SIP server.

The group call providing system according to another embodiment of the present invention receives a temporary session request message transmitted for a temporary call with a second terminal of the at least three or more terminals from a first terminal of the at least three or more terminals having a group call. A dedicated Short Message Service Center (SMS) server for generating a session establishment message, and a temporary session between the first terminal and the second terminal in response to the session establishment message to establish a temporary session between the first terminal and the second terminal. Includes voice server to control only to make temporary calls.

The group call method according to the present invention comprises the steps of performing a group call between at least three or more terminals, during the group call, a first terminal of the at least three terminals for a temporary call with a second terminal of the at least three terminals. Transmitting a temporary session request message, establishing a temporary session between the first terminal and the second terminal in a predetermined server in response to the temporary session request message, and if the temporary session is established, the first terminal and the And making a temporary call only between the second terminals.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments.

2 is a view for explaining a PoC group call according to an embodiment of the present invention.

Referring to FIG. 2, the group call providing system 200 according to the present invention includes a SIP server 210 and a PoC server 220.

The SIP server 210 receives a temporary session request message transmitted for a temporary call with a second terminal 206 of the at least three or more terminals from the first terminal 205 among the at least three or more terminals having a group call. A session establishment message is generated, and a temporary session 208 between the first terminal 205 and the second terminal 206 is established according to a predetermined response message, so that the first terminal 205 and the second terminal 206 are set. ) To control only temporary calls.

The PoC server 220 generates the predetermined response message according to the session establishment message from the SIP server 210 so that the SIP server 210 can establish the temporary session. Answer

In FIG. 2, PoC clients, which are three or more terminals including the first terminal 205 and the second terminal 206, are terminals that request a service and transmit or receive a paging message. Unless otherwise mentioned, PoC clients including the first terminal 205 and the second terminal 206 are used in the same sense as a PTT service subscriber.

In the embodiment of Figure 2, access network 204 means access network in an existing cellular network. As a specific example, the access network 204 may include a base station transceiver system (BTS), a base station controller (BSC) and a packet data switching network (PDSN) of IS-95 and CDMA 2000. . Through such an access network 204, PoC clients including the first terminal 205 and the second terminal 206 can access a PoC network based on IP.

Under the control of the PoC server 220, the SIP server 210 performs a message transfer and registration procedure of PoC clients for the PoC service network, and in particular, allows a temporary session during a group call according to the present invention to be set up. The SIP server 210 may be connected to the PDSN of the access network 204 and may be referred to as a proxy.

The PoC server 220 receives a SIP message from the SIP server 210 and interworkes with the GLMS 201 to perform call processing for the corresponding service. GLMS 201 stores the member information for the group registered by the PoC clients, that is, the information of the service subscriber. The GLMS 201 transmits group member information (eg, subscriber's ID, terminal number, etc.) to the PoC server 130 at the request of the PoC server 220, and the GLMS management unit 202 transmits the GLMS 201. Perform management for).

Presence Server (203) is a server that stores status information such as online status and location of PTT service subscribers, and registers and maintains the current location of users who are online to inform users who want this information. Enables immediate communication service.

While PoC clients are conducting a group call via a group session 207, the first terminal 205 according to the present invention may request to establish a temporary session 208 with the second terminal 206, which is a particular terminal. Accordingly, when the temporary session 208 is established, the temporary session 208 may make a temporary call with the second terminal 206. 3, setting up a temporary session 208 will be described in more detail.

3 is a flowchart for describing an operating method of the configuration module of FIG. 2.

In order to conduct a group call, the first terminal 205 sends an Alert Request message, which is one of SIP messages, to the SIP server 210 to call other PoC clients, and the SIP server 210 sends the first terminal 205. Message is received from the PoC server 220. The PoC server 220 transmits a predetermined message received from the SIP server 210 to which the first terminal 205 belongs to the SIP server 210 to which the second terminal 206 to be called belongs, and the SIP server. 210 establishes a group session 207 between the first terminal 205 and the second terminal 206 according to a predetermined message received from the PoC server 220. In a similar manner, the first terminal 205 in which a group session 207 is established with the remaining PoC clients performs a group call using the group session 207. In this case, when the user of the first terminal 205 wants to have a one-to-one call with a user of the second terminal 206, which is a specific terminal among the plurality of PoC clients, the first terminal 205 performs the step. In step 301, the temporary session request message is transmitted to the SIP server 210. Accordingly, the SIP server 210 transmits a session establishment message corresponding to the temporary session request message to the PoC server 220 in step 302. The PoC server 220 transmits a notification message to the second terminal 206 through the SIP server 210 in which the second terminal 206 is located according to the session establishment message. The notification message is a message for requesting authentication of a user of the second terminal 206 for setting up the temporary session 208. In step 304, the second terminal 206 receiving the notification message is determined. It responds by sending an ACK message to the PoC server 220 through the SIP server 210. The PoC server 220 receiving the ARK message controls the SIP server 210 so that a temporary session 208 with the first terminal 205 is established in step 305 and the second in step 306. Allow a temporary session 208 with the terminal 206 to be established. That is, when the PoC server 220 receives the ARK message from the second terminal 206, the PoC server 220 transmits a predetermined response message for establishing the temporary session 208 to the SIP server 210, and then, in step 305 and In step 306, a temporary session 208 is established between the first terminal 205 and the second terminal 206.

When the temporary session 208 is established, the user of the first terminal 205 and the user of the second terminal 206 can make a temporary call, except for other PoC clients.

The PoC server 220 according to an embodiment of the present invention generates a notification message to the second terminal 206 when receiving the session establishment message from the SIP server 210 in step 302, The process of receiving the message may be omitted, and the SIP server 210 may be controlled to establish the temporary session 208 immediately according to the steps 305 and 306.

In addition, when the temporary call is to be terminated, the first terminal 205 transmits a release request message to the SIP server 210 in step 307 similarly to step 301. Accordingly, the SIP server 210 generates a session release message corresponding to the release request message in step 308 and transmits the session release message to the PoC server 220. Upon receiving the session release message, the PoC server 220 transmits a predetermined notification message to the second terminal 206 through the SIP server 210 to which the second terminal 206 belongs (step 309). . Accordingly, in step 310, the second terminal 206 transmits a predetermined ARK message through the SIP server 210 to release the temporary session 208 established with the first terminal 205. Send to 220. Upon receiving the ARK message, the PoC server 220 releases the temporary session 208 set through the steps 305 and 306 through steps 311 and 312. Steps 311 and 312 of releasing the temporary session 208 include resetting the group session 207 for the group call prior to the temporary call.

In FIG. 3, the PoC server 220 transmits a notification message to the second terminal 206 to release the temporary session 208 and the temporary message when receiving the Ack message for the notification message. Release session 208. However, according to another embodiment of the present invention, when the PoC server 220 receives the session release message from the SIP server 210, the PoC server 220 immediately transmits the notification message without acknowledging the acknowledgment message. The temporary session 208 may be released.

Thus, one-to-one conversation between specific terminals is possible while performing a group call through a group session 207 in a packet network. In addition, by applying the configuration of FIG. 1 described above, a temporary call between a specific terminal and a plurality of terminals, such as a one-to-two and one-to-three conversation, is also possible.

4 is a diagram for explaining a PoC group call according to another embodiment of the present invention.

As shown in FIG. 4, the group call providing system 400 according to the present invention implemented in the circuit network includes a dedicated SMSC server 410 and a voice server 420.

The dedicated SMSC server 410 is a temporary session request message 403 transmitted for a temporary call with a second terminal 402 of the at least three or more terminals from the first terminal 401 of the at least three terminals having a group call ) To generate a session setup message.

In addition, the voice server 420 establishes a temporary session 405 between the first terminal 401 and the second terminal 402 in response to the session establishment message, and connects the first terminal 401 with the first terminal 401. Only the second terminal 402 controls to make a temporary call.

More specifically, the first terminal 401 performs a group call through a group session 404 with a plurality of PoC clients including the second terminal 402, and the second terminal 402 during the group call. The temporary session request message is transmitted to the dedicated SMSC server 410 for the temporary call with the request for setting up the temporary session 405. Accordingly, the voice server 420 receives a session establishment message from the dedicated SMSC server 410 and, for the temporary call between the first terminal 401 and the second terminal 402 according to the session establishment message. A temporary session 405 is established. The operation method of each component in FIG. 4 will be described in more detail with reference to FIG. 5.

5 is a flowchart for describing an operating method of the configuration module of FIG. 4.

Referring to FIG. 5, in operation 501, the first terminal 401 is a dedicated SMSC server for a temporary call with a second terminal 402, which is a specific terminal, during a group call with a plurality of PoC clients through a group session 404. The temporary session request message is sent to 410. Accordingly, the dedicated SMSC server 410 generates a session establishment message corresponding to the temporary session request message and transmits it to the voice server 420 (step 502). In operation 503, the voice server 420 transmits a notification message to the second terminal 402 according to the session establishment message through the dedicated SMSC server 410. Through the notification message, the second terminal 402 can know that a request to set up a temporary session 405 for a temporary call from the first terminal 401 has been accepted among a plurality of PoC terminals having a group call. Accordingly, it is determined whether to accept. If the temporary session 405 is accepted, the second terminal 402 sends a response message to the notification message to the dedicated SMSC server in step 504. Upon receiving the response message, the dedicated SMSC server 410 establishes a temporary session 405 between the first terminal 401 and the second terminal 402 through step 505.

The voice server 420 according to an exemplary embodiment of the present invention does not transmit a notification message to the second terminal 402 or confirm whether to receive a response message from the second terminal 402, and the dedicated SMSC. The temporary session 405 may be established immediately upon receiving a session establishment message from the server 410.

When the first terminal 401 and the second terminal 402 make a temporary call through the established temporary session 405, and want to terminate the temporary call, the first terminal 401 may perform the step in step 507. The release request message is transmitted to the dedicated SMSC server 410. Accordingly, the dedicated SMSC server 410 transmits a session release message requesting the release of the temporary session 404 to the voice server 420, and the voice server 420 performs step 511 according to the session release message. In step 512, the temporary session 405 established between the first terminal 401 and the second terminal 402 is released. Step 511 and step 512 of releasing the temporary session 405 include resetting the group session 404 for the group call prior to the temporary call.

When the voice server 420 receives the session release message from the dedicated SMSC server 410, in step 509, the second terminal is configured to release the temporary session 405. The notification message is sent to 402. In step 510, the second terminal 402 transmits a predetermined response message to the dedicated SMSC server to release the temporary session 405 according to the notification message. When the voice server 420 receives the response message to the notification message, the voice server 420 performs steps 511 and 512 for releasing the temporary session 405.

As described above, the present invention may provide a temporary call between specific users during a group call through PoC.

Embodiments of the invention include a computer readable medium containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, flash memory, and the like. Hardware devices specifically configured to store and execute the same program instructions are included. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from such description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

In the group call providing system and method according to the present invention, a temporary call service can be provided only to specific users during a group call, so that secret information required only for specific users during the group call can not be exposed to other users.

Claims (11)

Receiving a temporary session request message transmitted for a temporary call with a second terminal of the at least three terminals from a first terminal of the at least three terminals having a group call, and generating a session establishment message; A SIP server for controlling a temporary call only between the first terminal and the second terminal by establishing a temporary session between the first terminal and the second terminal; And PoC server generating the predetermined response message according to the session establishment message and responding to the SIP server Group call providing system comprising a. The method of claim 1, The PoC server controls the SIP server to establish the temporary session upon receiving a predetermined ACK message from the second terminal according to a predetermined notification message sent to the second terminal in response to the session establishment message. Group call providing system, characterized in that. The method of claim 1, The SIP server receives a release request message sent from the first terminal to release a temporary session with the second terminal, generates a session release message, and the PoC server responds to the session release message. And a server controls to release the temporary session. The method of claim 3, The PoC server controls the SIP server to release the temporary session upon receiving a predetermined ACK message from the second terminal according to a predetermined notification message sent to the second terminal in response to the session release message. Group call providing system, characterized in that. A dedicated Short Message Service Center (SMSC) for generating a session establishment message by receiving a temporary session request message transmitted for a temporary call with a second terminal of the at least three terminals from at least one of the at least three terminals having a group call. ) server; And Voice server for controlling a temporary call only between the first terminal and the second terminal by setting a temporary session between the first terminal and the second terminal in response to the session establishment message. Group call providing system comprising a. The method of claim 5, And the voice server sets up the temporary session upon receiving the predetermined response message from the second terminal according to the predetermined notification message sent to the second terminal in response to the session establishment message. The method of claim 5, The SMSC server receives a release request message sent from the first terminal to release a temporary session with the second terminal, generates a session release message, and the voice server responds to the session release message. Group call providing system, characterized in that to release the session. The method of claim 5, And the voice server releases the temporary session upon receiving a predetermined response message from the second terminal according to the predetermined notification message transmitted to the second terminal in response to the session release message. In the group call method between mobile communication terminals, Making a group call between at least three terminals; Transmitting, by the first terminal of the at least three terminals, the temporary session request message for the temporary call with the second terminal of the at least three terminals during the group call; Establishing a temporary session between the first terminal and the second terminal in a predetermined server in response to the temporary session request message; And Making a temporary call only between the first terminal and the second terminal when the temporary session is established Group communication method between the mobile communication terminal comprising a. The method of claim 9, After the temporary session is established, Sending, by the first terminal, a release request message to release the temporary session; And Releasing the temporary session established between the first terminal and the second terminal in the predetermined server in response to the release request message. Group communication method between the mobile communication terminal further comprising. The method of claim 9, And when the predetermined server transmits a notification message to the second terminal according to the temporary session request message, and receives a response message to the notification message from the second terminal, the temporary session is set up. Group call method between terminals.

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