KR20090059898A - Method and system and poc terminal for assignning media trasmission right on establishment of poc session - Google Patents

Abstract

A media transmission right assignment method, a system for the same and a PoC terminal for alienating a PoC session to a desired PoC client are provided to operate a PoC session efficiently by applying a media transmission right to the PoC client desiring a media transmission right by the PoC user. A transmission side PoC(PTT(Push To Talk) over Cellular) client transmits and generates a session invitation request message to a client. If the session invitation request message is received, the PoC server transmits the session invitation request message to the receiving side PoC client. The session invitation request message comprises a media transmission right assignment parameter and the invited PoC client information.

Description

METHOD AND SYSTEM AND POC TERMINAL FOR ASSIGNNING MEDIA TRASMISSION RIGHT ON ESTABLISHMENT OF PoC SESSION}

The present invention relates to a method and system for establishing a PoC session and a PoC terminal. More particularly, the present invention relates to a method and system for transferring a media transmission right to a counter PoC user who invites a founder to invite a PoC session when a PoC session is established. And a PoC terminal.

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. In addition, the needs of users are diversified, and beyond the simple call service, the service is expanding to location services, multimedia services, and push-to-talk (PTT) services, etc. In particular, the PTT service is a conventional radio or TRS (Trunked Radio) service. It supports various additional functions such as instant messenger and status display as well as group call and voice call.

Currently, the establishment of standards for PoC (PTT over Cellular) service that uses this PTT concept through mobile communication network is actively discussed.Features of PoC service distinguished from existing mobile communication service One is that the user belongs to multiple sessions so that they can make calls while moving from session to session as needed. Is specified in the requirements of the Open Mobile Alliance (OMA), an organization that defines mobile telecommunications services.

Meanwhile, referring to the PoC calling service among PoC services, the PoC user registers the PoC address of his PoC client in the SIP / IP core in order to use the PoC calling service. At this time, the SIP / IP core stores information on the PoC client based on the request of the PoC client. Therefore, when another PoC user attempts to make a PoC group call, as described above, his / her own information is registered in the SIP / IP core and the call request is made to his SIP / IP core network using the group identification information received from the XDMS. Do it. At this time, the SIP / IP core transfers the PoC call request to the home PoC server where the requesting PoC user is registered after the address determination and domain location determination process using the requesting PoC user information. The PoC server prepares to establish a PoC session for the PoC call request, obtains each client information from the XDMS server, and transmits a call request signal to the corresponding SIP / IP core network. At this time, in case of call request to clients in intra domain, PoC server performs both PF and CF functions. The PoC server managing the call request PoC client uses the information of the PoC client delivered to itself, and after making a positioning process of the SIP / IP core network, makes a call request to the corresponding PoC client. When a PoC client requesting a PoC call sends an OK response to his / her PoC client through a PoC client, the PoC call is opened.

As described above, when a PoC user establishes a PoC session using his PoC client, the initial media transmission right is given to the PoC client requesting to establish a session. Next, a flow of granting media transmission right when opening a current PoC session will be described with reference to FIG. 4.

The PoC client A is a PoC session establisher. In step 400, the PoC client A transmits a session invitation request message to a PoC server A (PF: Participating PoC Function), which is its home server. At this time, the session invitation request message may be transmitted as an INVITE message, and the message includes a value of the talk burst grant parameter (tb_granted parameter) as 1. The meaning of the value of the talk burst permission parameter is 1 means that the PoC server serving as a control server (CF: Controlling PoC Function) manages the PoC session as a whole without PoC client A requesting a media transmission right from the PoC server. It means you want to give yourself the right to send media.

Thereafter, the PoC server A delivers the session invitation request message received in step 402 to the PoC server X. The PoC server X checks the request URI and transmits the session invitation request message to the PoC client B, which is the target PoC client, in steps 404 and 406. In this case, it is assumed that the target PoC client is PoC client B in FIG. 4. However, at this time, since the talk burst permission parameter is an indication that the PoC client A requesting to open a PoC session wants to acquire a media transmission right, it has nothing to do with PoC user B. Therefore, the session invitation request message transmitted in steps 404 and 406 does not include the talk burst grant parameter.

Then, when PoC user B of PoC client B receiving the session invitation request message requests to join the session, PoC client B sends a 200 OK message to PoC server X through PoC server B as a response message in steps 408 and 410. Send and join a PoC session.

After that, the PoC server X confirming the session participation of the PoC client B through the response message transmits a response message to the PoC client A through the PoC server A in steps 412 and 414, and the talk burst grant parameter is transmitted to the response message. So that the media transmission right will be sent to PoC Client A.

In operation 416, the PoC server X transmits a media transmission right grant message to the PoC client A to grant the media transmission right to the PoC client A. In this case, the media transmission right grant message may be transmitted as a talk burst grant message or a media burst grant message, which is a floor grant message.

Thereafter, after receiving the media transmission right grant message, the PoC client A may transmit media such as a speech to be transmitted or a video to transmit in step 418. On the current OMA PoC specification, PoC Client A may transmit media upon receiving a predetermined message including a talk burst grant parameter having a value of 1 without a Media Transfer Authorization message (Floor Grant message).

As described above, even if a PoC client establishing a PoC session conventionally does not send a talk burst request message or a media burst request message, which is a message for requesting media transmission rights, a session invitation is performed. When the request message indicated that the media transmission rights were received, the PoC server managing and mediating the PoC session was granted the PoC client who opened the PoC session.

However, in some cases, the user of the other PoC client participating in the PoC session needs to transmit the media first, rather than the user of the PoC client who established the PoC session. For example, before the user of PoC Client A establishes a PoC session, the user of PoC Client B sends an Instant Personal Alert message, which reads “PoC between PoC Users A and B. Although attempting to establish a session, since the PoC session call is not connected due to the absence of PoC user A, there is a case where a request is made to establish a PoC session when the call is available. In this case, PoC user A made a request to open a PoC session through PoC client A. However, it is PoC client B that has the media to be transmitted through the session.

That is, even though the other PoC client participating in the session must transmit the media, not the PoC client who established the session, the media transmission right is always given first to the PoC client requesting the establishment of the PoC session.

Accordingly, the present invention provides a method for enabling a PoC client establishing a session to transfer media transmission rights to a counterpart PoC client participating in the session, and a system and a PoC client therefor.

To this end, the present invention provides a system for establishing a Push To Talk (PTT) over the Cellular (PoTT) session, comprising: a sending PoC client, a receiving PoC client, and a session invitation request generating and transmitting a session invitation request message; Receiving a message, the PoC server transmitting the received session invitation request message to the receiving PoC client, wherein the session invitation request message includes the media transmission right transfer parameter and PoC client information to be invited; The media transmission right transfer parameter is information indicating that the transmitting PoC client transfers the media transmitting right to the receiving PoC client, and when the receiving PoC client receives the session invitation request message, the media transmitting right is transmitted. Have the option to take advantage of media transfer rights And when the response message including the parameter indicating that the media transmission right is to be transferred to the PoC server is received, the PoC server receives the media transmission right grant message for granting the media transmission right upon receiving the response message. Characterized in that the transmission to the side PoC client.

In addition, the present invention is a system including a transmitting PoC client for generating and sending a session invitation request message when a PoC session is to be established, and a plurality of receiving PoC clients, wherein the session invitation request message is a media transmission right transfer parameter. And the PoC client information invited, wherein the media transmission right transfer parameter is information indicating that the transmitting PoC client transfers the media transmission right to one PoC client of the receiving PoC client to invite to the PoC session. In response to receiving the session invitation request message, after confirming the receiving PoC client that has transferred the media transmission right in the received session invitation request message, a parameter indicating that the media transmission right is transferred to the confirmed receiving PoC client is included. Session invitation request menu A PoC server that transmits a message and transmits a session invitation request message for the PoC session invitation to the remaining PoC clients, wherein the receiving PoC client includes a parameter indicating that the media transmission right is transferred. When the message is received, it transmits a response message to the PoC server indicating that the media transmission right has been transferred and including a parameter for notifying that the media transmission right is to be transferred if there is a choice to use the media transmission right. When the response message is received, a media transmission right grant message for granting a media transmission right is transmitted to the receiving side PoC client.

In another aspect, the present invention is the system in the system comprising a transmitting PoC client, a PoC server, at least one receiving PoC client invited to the PoC session to establish a push to talk (PTT) over the Cellular (PTT) session A method for establishing a PoC session, wherein the transmitting PoC client transmits a media indicating that the transmitting PoC client transfers a media transmission right to one of the receiving PoC clients to which the PoC client intends to invite the PoC session. Transmitting a session invitation request message including a right transfer parameter and the receiving PoC client information to the PoC server; and when the PoC server receives the session invitation request message, transmits media in the received session invitation request message. Receiving side PoC after checking the receiving side PoC client which has transferred the right Transmitting a session invitation request message including a parameter indicating that the media transmission right is transferred to the C client; and receiving a session invitation request message including a parameter indicating that the media transmission right is transferred by the receiving PoC client. Transmitting a response message to the PoC server including a process of notifying that the transmission right has been transferred, and a parameter for notifying that the media transmission right is to be transferred if there is a choice to use the media transmission right, and the PoC server And receiving the response message, transmitting a media transmission right grant message for granting media transmission right to the receiving side PoC client.

In addition, the present invention provides a PoC terminal for establishing a PoC terminal in a system including a PoC terminal and a PoC server that establishes a PoC Push to Talk (PTT) session and participates in a PoC session, and transmits and receives a message. And a session invitation request message including a media transmission right transfer parameter indicating the transfer of a media transmission right to one of the PoC clients of the receiving PoC client to be invited to the PoC session and the PoC client information. Transmits through the wireless unit, and if a session invitation request message including a parameter indicating that the media transfer right is transferred through the wireless unit is notified, the media transfer right is transferred, and if the media transmission right is selected, the media is transmitted. Include parameters to indicate that transfer rights will be transferred And a controller for transmitting the included response message to the PoC server through the wireless unit.

The present invention enables a PoC user who establishes a PoC session to grant a media transmission right to a PoC client who wants to grant media transmission right through his client. By doing so, users of PoC clients who actually need media transmissions in the established PoC sessions have the advantage of increasing the efficiency of PoC session operations by obtaining media transmission rights.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

First, a PoC system to which the present invention is applied will be described with reference to FIGS. 1 to 3. In the following, an example of applying the present invention to a PTT over Cellular (PoC) system, which provides a PTT service using a cellular mobile communication network, among the Push To Talk (PTT) systems, is an example. In general, the PoC system uses a Session Initiation Protocol (SIP) protocol and a SIP extension protocol to deliver session participation information of a group call, and uses an XML Configuration Access Protocol (XCAP) protocol to obtain group information. The functions of the present invention described below can be implemented by the above-described protocols, and the basic structure of the present invention can be based on the PoC Rel.1 system. First, a general PoC system to which the present invention can be applied will be described.

1 is a conceptual diagram of a general PoC service system and related network structure.

As shown in FIG. 1, a general PoC system may be configured to include a PoC user equipment (UE) 100, XML Document Management Servers (XDMS), and a PoC server 150. In addition, the PoC system may further include an aggregation proxy server 160. These components may be connected via an access network 110, a SIP / IP core network 120, and a remote PoC network 170.

Each of the above-described components will be described below.

The PoC terminal 100 may include a PoC client 102 and an XDMC 104.

The PoC client 102 is a service requester embedded in the PoC terminal 100 and resides in the PoC terminal 100 to perform network access for providing PoC service to a PoC service subscriber. PoC service subscriber can receive PoC service through PoC terminal in which PoC client is embedded. In the following description of the present invention, the term PoC client will be used as a generic term for a terminal having a PoC client and a subscriber to a PoC service. In addition, reference numerals of PoC clients will be omitted later unless otherwise specified.

The main function of the PoC client is to establish a PoC session, join an existing session that has been established, or terminate the established session at the PoC service subscriber, that is, a PoC user. The PoC client also creates and delivers talk bursts, supports instant personal alerts, and authenticates when accessing PoC services. The PoC client may be connected to the SIP / IP core network 120, which is a SIP / IP multimedia support core network, via the access network 110.

The SIP / IP core network 120 is connected to the PoC server 150, the XDMS 130, 140, and the like to support the PoC service to provide a service. At this time, the PoC server 150 may perform a Controlling PoC Function function for maintaining and managing a PoC session or a Participating PoC Function function for joining a PoC session established for one-to-one or multi-party calls.

Meanwhile, the PoC service may be accompanied by a service for establishing a group session, such as a conference call. To this end, the OMA standard defines an XDM (XML Document Management) client 104 and an XDMS 130 and 140 for a group list service. 1 illustrates a common XDMS 130 that may be commonly used for PoC XDMS 140 and other service enablers used for PoC services. Information about the group and the group members may be stored in the XDMS (130) 140 via the PoC client. The PoC client can know the information of the PoC clients that can be called through the individual or group list received from the XDMS (130) (140). Meanwhile, creation, modification and management of groups and group members for the XDMS 130 and 140 may be performed through a communication network trusted by a PoC service provider such as the Internet or an intranet. Detailed descriptions on the protocol and details of XML document management such as creating, modifying, and removing a group list will be omitted.

Also, for the group service, the aggregation proxy server 160, when receiving the group list related request from the XDMC 104, routes it to each XDMS 130, 140 according to the appropriate rules.

Next, the PoC server 150 will be described.

2 is a schematic structural diagram of a general PoC server.

In terms of functionality, the PoC server is a Controlling PoC Function (hereinafter referred to as CF) that maintains and manages a PoC session as a whole, and a participating PoC Function (hereinafter referred to as PF) that manages maintenance between sessions. It can be divided into. Features of each PoC server will be described with reference to Tables 1 and 2 below.

Provides centralized PoC session handling Provides the centralized Media distribution Provides the centralized Talk Burst Arbitration functionality including talker identification Provides SIP session handling, such as SIP session origination, termination, etc Provides policy enforcement for participation in group sessions Provides the participants information Collects and provides centralized media quality information Provides centralized charging reports May Provide transcoding between different codecs Support Talk Burst Control Protocol Negotiation

As shown in <Table 1>, CF manages PoC session as a whole among PoC server's functions. Particularly, CF accepts order of floor request and grants authority. The talk burst requested by the PoC client is distributed to all other PoC clients participating in the group call, and provides information on the PoC client participating in the group call.

The PF manages sessions associated with the CF and each PoC client in the PoC session, as shown in Table 2 below. In particular, the PF plays a role in relaying when the PoC client requests a voice or grants a voice to the PoC client in the CF. PF also plays a role in media relay between CF and PoC clients, transcoding if different codecs are used between them, and in the case of concurrent sessions when talking in one session, Filters one by choice.

Participating PoC Function (PF) Provides PoC session handling May provide the Media relay function between PoC Client and Controlling PoC server May provide user media adaptation procedures May provide the Talk Burst control message relay function PoC Client and Controlling PoC server Provides SIP session handling, such as SIP session origination, termination , etc, on behalf of the represented PoC Client Provides policy enforcement for incoming PoC session (eg access control, incoming PoC session barring, availablity status, etc) May collect and provide media quality information Provides the participant charging reports May provide filtering of the media streams in the case of simultaneous sessions May provide transcoding between different codecs May support Talk Burst Control Protocol Negotiation Stores the current Answer Mode and Incoming PoC Session Barring preferences of the PoC Client

The aggregation proxy server 160 collects all messages using the XCAP protocol in the PoC system and delivers them to the corresponding entity.

3 is a diagram schematically illustrating a Controlling PoC Function block and a Participating PoC Function block of a PoC server.

Referring to FIG. 3, each PoC clients 102-A through 102-D establish a PoC session by accessing the CF 300 through the PFs 310-A through 310-D. Thereafter, the media for the corresponding speech of the PoC client granted the speaking right from the CF 300 is delivered to each PoC clients. At this time, the PoC client granted the right to speak may make an appropriate speech only after confirming the information of the PoC clients participating in the group session.

A process for allowing a PoC client establishing a session in the PoC system configured as described above to transfer a media transmission right to a counterpart PoC client participating in the session will be described with reference to FIG. 5.

Hereinafter, a user of PoC client A will be referred to as PoC user A and PoC client B will be referred to as PoC user B. And it is assumed that the client that PoC client A wants to transfer the media transmission right is PoC client B. In addition, as mentioned in FIG. 1, the PoC client is a service requester included in the PoC terminal, and performs network connection for providing PoC service to a PoC service subscriber while resident in the PoC terminal. The PoC user may be provided with a PoC service through a PoC terminal in which a PoC client is embedded. In the following description of the present invention, the term PoC client will be used as a generic term for a terminal having a PoC client and a PoC service subscriber. In addition, reference numerals of PoC clients will be omitted later unless otherwise specified.

First, when a function of granting media transmission right to PoC user B is selected by PoC user A, PoC client A generates a session invitation request message including a media transmission right transfer parameter MB_granted_forward in step 500. At this time, the value of the media transmission right transfer parameter included in the session invitation request message is set to 1 and included in the media information content using the Session Description Protocol (SDP) protocol.

As such, the PoC client A transmits the generated session invitation request message to a PoC server A (PF: Participating PoC Function), which is its home server, in step 501 to establish a PoC session. In this case, the session invitation request message may be transmitted as an INVITE message. After that, the PoC server A serving as a PF transmits the received session invitation request message to the PoC server X serving as a CF in step 502.

After that, PoC server X checks the request URI and the media transfer right transfer parameter (MB_grant_forward parameter) included in the session invitation request message, and then sessions to PoC client B, the target PoC client, through PoC server B in steps 504 and 506. Send the invitation request message. At this time, the PoC server X includes the media transfer right transfer notification parameter (MB_grant_ind parameter) as 1 in the session invitation request message and transmits it.

At this time, in the embodiment of the present invention, when the PoC client, the PoC session creator, transmits the session invitation request message to the PoC server, the media transmission rights transfer parameter is included, and the PoC server delivers the session invitation request message to the receiving PoC client. As described above, the media transmission right transfer notification parameter, which is a different parameter from the media transfer right transfer parameter, has been described. However, instead of using the media transmission right transfer parameter and the media transmission right transfer notification parameter separately, the PoC server may include the received media transfer right transfer parameter when the session invitation request message is transmitted to the receiving PoC client.

Then, the PoC client B receiving the session invitation request message including the media transmission right transfer notification parameter value of 1 informs the PoC user B that the media transmission right has been proposed. If the PoC user B has a choice to use the media transmission right, the PoC client B includes the value of the media transmission right transfer notification parameter as 1 in the response message, and transmits the response message to the PoC server B in step 508. In this case, the response message may be a 200 OK message. However, if the PoC user B has a choice not to use the media transmission right, the PoC client B includes the value of the media transmission right transfer notification parameter as 0 in the response message, and transmits the response message to the PoC server B in step 508. send. After receiving the response message, the PoC server B delivers the response message received to the PoC server X in step 501.

In response to receiving the response message including the media transfer right transfer notification parameter, the PoC server X checks whether the media transfer right transfer notification parameter value is 0 or 1 in step 512. That is, PoC server X performs different operations depending on whether the value of the media transfer right transfer notification parameter is 0 or 1. FIG.

 If the media transfer right transfer notification parameter value is 1, the PoC client B recognizes that the media transfer right transfer has been approved and includes the value of the media transfer right transfer parameter as 1 in the response message, and then steps 514 and 516. Sends a response message to PoC client A through. At the same time, the PoC server X sends a PoC client B by sending a Media Burst Control Protocol (MBCP) _Grant message (Media Transfer Control Protocol defined in the OMA PoC Spec) to the PoC Client B in step 517. Allow Client B to transfer the media. Then, the PoC client B receiving the media transmission right grant message performs an operation for transmitting the media to be transmitted by the PoC user B to the PoC client A in step 520. In addition, the PoC client A receiving the response message in step 516 can confirm that the PoC client B has acquired the media transmission right through the media transfer right transfer parameter value “1”. In addition, the PoC client A may perform an operation for notifying the PoC user A in the same manner as indicating that the PoC client B acquires the media transmission right and intends to transmit the media on the screen of the PoC terminal.

If the media transfer right transfer notification parameter value is 0, the PoC server X sends a media transfer right idle notification (MB_Idle MBCP) message indicating that no PoC user has media transfer rights in the current PoC session (step 518). Send to PoC clients A and B who participated in PoC session

In FIG. 5, a method of granting a media transmission right when making a one-to-one call is illustrated. Hereinafter, a method of granting a media transmission right when an ad hoc group call is described in FIGS. 6A and 6B will be described. do. First, in FIG. 6A and 6B, a user of PoC client A is called PoC user A, a PoC client B is called PoC user B, and a user of PoC client C is called PoC user C. FIG. In the PoC session established by the PoC client A, the participant is a group including the PoC client B and the PoC client C, and the client to transfer the media transmission right is assumed to be a PoC client C.

First, PoC user A must decide which PoC client's users want to grant media transmission rights among several PoC session participants. If a predetermined PoC client is selected from PoC user A to grant media transmission rights, PoC client A requests a session invitation request indicating that the client has selected to transfer the rights among the media transmission rights transfer parameter and the session invitees in step 600. Create a message. At this time, if there is a client indication that the user chooses to transfer the right, it can be known that the PoC session initiator has transferred his / her media transmission right, so the media transmission right transfer parameter does not need to be included. Of course, you can include both. In FIG. 6A and FIG. 6B, it is assumed to be transferred to PoC client C, and thus includes Floor_forward = “true” value to indicate the PoC client that was transferred in the ad hoc session inviter resource-list of the session invitation request message. .

The session invitation request message generated as described above may be illustrated in FIG. 7. Referring to FIG. 7, "MB_granted_forward = 1" is included in the session invitation request message as shown in 702. In addition, the PoC clients of the receiving PoC clients have the same URI as 710. Among them, PoC clients that PoC client A intends to transfer media transmission rights to include as "Floor_forward =" true "" as shown in 712, requesting an invitation to the session. To the PoC client C. In this case, as shown in FIG. 5, when there is only one PoC client requesting an invitation to a PoC session to be opened by the PoC client A, a session invitation request message including only a media transmission right transfer parameter may be generated. However, if there are a plurality of PoC clients requesting an invitation to a PoC session to be opened by PoC client A, as shown in FIG. 7, a session invitation request including a media transmission right transfer parameter and an indication of which client to transfer to You can create a message. In another embodiment, as shown in FIG. 7, not including both 702 and 712, a session invitation request message including only information about which client to transfer, such as 712, may be generated.

In the present invention, the difference between the session invitation request message transmitted to establish a session between the one-to-one call and the ad hoc group call is not related to the contents of the present invention and will not be described in detail. However, in order to avoid confusion, briefly, in one-to-one call, Request URI and To Header values are the address values of the PoC client to invite to the PoC session, and in the ad hoc group call, the requestor information. The Request URI and To Header values use the URI (conf_fac_URI) value used to create the conference. Using this value, you can create a resource-list in XML to include the address values of multiple PoC clients that you want to invite to a PoC session. The “Floor_forward” value, which is an indication of which client to transfer in the present invention, is included here in the resource-list. In addition, as mentioned above, in the case of an ad hoc group call, the media transmission right transfer parameter value may or may not be included in the media attribute information of the SDP protocol. In FIG. 7, it is illustrated as being included.

Meanwhile, in step 601, the PoC client A transmits the session invitation request message generated in step 600 to its own PoC server A (Participating PoC Function). In this case, the session invitation request message may be transmitted as an INVITE message. After that, the PoC server A serving as a PF transmits the received session invitation request message to the PoC server X serving as a CF in step 602.

The PoC server X then checks in the resource-list in the session invitation request message which client the media transfer right has been transferred to. That is, it checks whether the "Floor_forward" value is "true" in the URI of any client. If the session invitation request message as shown in FIG. 7 is transmitted to PoC server X, PoC server X confirms that PoC client C is set to Floor_forward = “true”, and steps 606 and 607 to PoC client C, which is a target PoC client. Sends a session invitation request message through PoC server C. At this time, the PoC server X includes the media transfer right transfer notification parameter (MB_grant_ind parameter) as 1 in the session invitation request message and transmits it. In addition, in step 604 and 605, the PoC client B, which is another PoC client, transmits a session invitation request message that does not include a media transmission right transfer notification parameter. In this case, the session invitation request message including the media transmission right transfer notification parameter transmitted from the PoC server X to the PoC client C in step 606 may be illustrated in FIG. 8. 8 illustrates a part of the session invitation request message.

Referring to FIG. 8, since PoC server X transmits a session invitation request message to PoC client C, the request URI and To Header values are “sip: PoCClient_C@example.com, which is an address of PoC client C. Is set to ”. Instead, the value of the content header indicates a PoC session ID using a conference URI value generated by a URI (conf_fac_URI) used to create a conference. In particular, in the present invention, the parameter for notifying that the media transfer right is transferred may include a media transfer right transfer notification parameter (MB_grant_ind parameter) value as 1 in the media attribute information 800 of the SDP protocol as shown in 802.

Then, the PoC client B transmits a 200 OK message, which is a response message to the session invitation request message, to the PoC server X through steps 608 and 609.

In addition, the PoC client C receiving the session invitation request message including the media transmission right transfer notification parameter value of 1 informs the PoC user C that the media transmission right has been proposed. If the PoC user C has a choice to use the media transmission right, the PoC client C includes the value of the media transmission right transfer notification parameter as 1 in the response message and transmits the response message to the PoC server C in step 610. In this case, the response message may be a 200 OK message. However, if the PoC user C has a choice not to use the media transmission right, the PoC client C includes the value of the media transmission right transfer notification parameter as 0 in the response message, and transmits the response message to the PoC server C in step 610. send. After receiving the response message, the PoC server C delivers the received response message to the PoC server X in step 611.

Then, in response to receiving the response message including the media transmission right transfer notification parameter, the PoC server X checks whether the media transfer right transfer notification parameter value is 0 or 1 in step 612. That is, PoC server X performs different operations depending on whether the value of the media transfer right transfer notification parameter is 0 or 1. FIG.

If the media transfer right transfer notification parameter value is 1, the PoC client C recognizes that the media transfer right transfer has been approved and includes the value of the media transfer right transfer parameter as 1 in the response message, and then steps 614 and 616. Send a response message to the PoC client A through. At the same time, in step 618, the PoC server X transmits a media transmission right grant message to the PoC client C, which actually grants the media transmission right, to allow the PoC client C to transmit the media.

Then, the PoC client C receiving the media transmission authorization message transmits the media to be transmitted by the PoC user C to the PoC server X in step 622, and the received PoC server X joins the PoC session in steps 624 and 626. Send to all PoC clients. In addition, the PoC client A receiving the response message in step 616 may confirm that the PoC client C has acquired the media transmission right through the media transmission right transfer parameter value “1”. Also, the PoC client A may perform an operation for notifying the PoC user A in the same manner as displaying on the screen of the PoC terminal that the PoC client C has obtained the media transmission right.

If the media transfer right transfer notification parameter value is 0, the PoC server X sends a media transfer right idle notification (MB_Idle MBCP) message indicating that no PoC user has media transfer right in the current PoC session (step 620). Send to all PoC clients participating in PoC session.

5, 6A, and 6B described above, the media transmission right grant message is separately transmitted to grant the media transmission right to the PoC client to which the transmission right is transferred. However, steps 504 and 506 and steps 606 and 607 are described. The media transmission right transfer notification parameter included in the session invitation request message transmitted in step may serve as a message for granting media transmission rights (Floor Grant message (MBCP_Grant message)). In this case, when the media transfer right transfer notification parameter serves as a message for granting media transfer rights, a separate media transfer grant message (MBCP_Grant message) does not need to be transmitted as in steps 517 and 618. The effect of reducing one procedure may be seen.

1 is a conceptual diagram of a general PoC service system and related network structure;

2 is a schematic structural diagram of a general PoC server;

3 is a diagram for schematically explaining a Controlling PoC Function block and a Participating PoC Function block of a PoC server;

4 is a signal flow diagram for granting media transmission right when a conventional PoC session is established.

5 is a view for explaining granting media transmission rights to a receiving PoC client in a one-to-one call according to an embodiment of the present invention;

6A and 6B are diagrams for explaining granting media transmission rights to a receiving PoC client in an ad hoc group call according to an embodiment of the present invention;

7 illustrates an example of a session invitation request message transmitted by a PoC client when an ad hoc group session is established according to an embodiment of the present invention;

8 is a diagram illustrating an example of a session invitation request message that a PoC server sends to a receiving side media transmission right grant target PoC client according to an embodiment of the present invention.

Claims (15)

In the system for establishing a PoC (Push To Talk) over the Cellular (PTT) session, A sending PoC client generating and sending a session invitation request message; The receiving PoC client, Receiving the session invitation request message, the PoC server transmitting the received session invitation request message to the receiving PoC client; The session invitation request message includes the media transmission right transfer parameter and the invited PoC client information, and the media transmission right transfer parameter includes information indicating that the transmitting PoC client transfers the media transmission right to the receiving PoC client. , When the receiving PoC client receives the session invitation request message, the PoC client receives a response message including a parameter for notifying that the media transmission right has been transferred and indicating that the media transmission right will be transferred if there is a choice to use the media transmission right. To the PoC server, And when the PoC server receives the response message, transmits a media transmission right grant message to the receiving PoC client to grant media transmission right. The method of claim 1, wherein the receiving PoC client, When the session invitation request message is received, a message indicating that the media transmission right has been transferred is transmitted, and if there is a choice not to use the media transmission right, a response message including a parameter indicating that the media transmission right is not transferred is transmitted to the PoC server. And a system for transferring media transfer rights. The method of claim 2, wherein the PoC server, And upon receipt of a response message including a parameter indicating that the media transfer right will not be transferred, notifying all PoC clients participating in the PoC session that a media transfer right idle state. The method of claim 1, wherein the PoC server, And transmitting a response message to the transmitting PoC client including a parameter for indicating that the media transmission right that has received the response message is to be transferred. In a system including a sending PoC client for generating and sending a session invitation request message when a PoC session is to be established, and a plurality of receiving PoC clients, The session invitation request message includes a media transmission right transfer parameter and invited PoC client information, and the media transmission right transfer parameter includes one PoC client of one of the receiving PoC clients that the sending PoC client wants to invite to the PoC session. Information indicating that you are giving away the right to transfer media. When the session invitation request message is received, the session including the parameter indicating that the media transmission right is transferred to the confirmed receiving PoC client after confirming the receiving PoC client that has transferred the media transmission right in the received session invitation request message A PoC server for transmitting an invitation request message and transmitting a session invitation request message for the PoC session invitation to the remaining PoC clients; When the receiving PoC client receives a session invitation request message including a parameter indicating that the media transmission right is transferred, it notifies that the media transmission right has been transferred, and receives the media transmission right if there is a choice to use the media transmission right. Send a response message including a parameter to inform the PoC server, And when the PoC server receives the response message, transmits a media transmission right grant message to the receiving PoC client to grant media transmission right. The method of claim 5, wherein the receiving PoC client, When the session invitation request message is received, a message indicating that the media transmission right has been transferred is transmitted, and if there is a choice not to use the media transmission right, a response message including a parameter indicating that the media transmission right is not transferred is transmitted to the PoC server. And a system for transferring media transfer rights. The method of claim 6, wherein the PoC server, And upon receipt of a response message including a parameter indicating that the media transfer right will not be transferred, notifying all PoC clients participating in the PoC session that a media transfer right idle state. The method of claim 6, wherein the PoC server, And transmitting a response message to the transmitting PoC client including a parameter for indicating that the media transmission right that has received the response message is to be transferred. The PoC session is established in a system including a transmitting PoC client, a PoC server, and at least one receiving PoC client invited to the PoC session, to establish a predetermined PoC PoC (Push To Talk) session. In the method for opening, The transmitting PoC client sends a media transmission right transfer parameter and the receiving PoC client information indicating that the transmitting PoC client transfers the media transmission right to one PoC client of the receiving PoC client to invite to the PoC session. Transmitting a session invitation request message to the PoC server; When the PoC server receives the session invitation request message, the PoC server checks the receiving PoC client that has transferred the media transmission right in the received session invitation request message, and then indicates that the media transmission right is transferred to the confirmed receiving PoC client. Transmitting a session invitation request message including a message; When the receiving PoC client receives a session invitation request message including a parameter indicating that the media transmission right is transferred, the media transmission right is transferred; Transmitting a response message to the PoC server, the response message including a parameter indicating that the media transmission right is to be transferred if there is a choice to use the media transmission right; And when the PoC server receives the response message, transmitting a media transmission right grant message for granting media transmission right to the receiving PoC client. 10. The method of claim 9, wherein after performing a process of transmitting a session invitation request message including a parameter indicating that the media transmission right is transferred to the confirmed receiving PoC client, And transmitting the session invitation request message for the PoC session invitation to the remaining PoC clients. The method of claim 9, wherein after performing the process of notifying that the media transmission right has been transferred, And if the receiving PoC client has a choice not to use the media transmission right, transmitting a response message including a parameter indicating that the media transmission right will not be transferred to the PoC server. Method for Assigning Transfer Rights. The method of claim 11, If the PoC server receives a response message including a parameter indicating that the media transmission rights will not be transferred, further comprising the step of notifying all PoC clients participating in the PoC session that the media transmission rights idle state. Method for Assigning Media Transfer Rights. The method of claim 9, The PoC server further comprises the step of transmitting a response message including a parameter for indicating that the media transmission rights received the response message to be transferred to the transmitting PoC client. Way. In the PoC terminal for establishing a PoC session in a system including a PoC terminal and a PoC server for establishing a PoC PoC (PTT (Push To Talk) over the Cellular) session and participating in the PoC session, Wireless unit for sending and receiving messages, Generates a session invitation request message including a media transmission right transfer parameter indicating that the media transmission rights are transferred to one PoC client of the receiving PoC client to invite to the PoC session and the invited PoC client information, and transmits the information through the wireless unit. And a session invitation request message including a parameter indicating that the media transfer right is transferred through the wireless unit, indicating that the media transfer right has been transferred, and receiving the media transfer right if there is a choice to use the media transfer right. PoC terminal comprising a control unit for transmitting a response message including a parameter for notifying that through the radio to the PoC server. The method of claim 14, wherein the control unit, When the session invitation request message is received, the PoC informs that the media transmission right has been transferred, and includes a response message including a parameter indicating that the media transmission right will not be transferred if there is a choice not to use the media transmission right. PoC terminal, characterized in that the transmission to the server.

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