KR101455387B1 - METHOD AND SYSTEM AND PoC TERMINAL FOR ASSIGNNING MEDIA TRASMISSION RIGHT ON ESTABLISHMENT OF PoC SESSION - Google Patents

Abstract

The present invention relates to a method and system for transferring media transfer rights to a relative PoC user who intends to invite an installer to a PoC session at the time of establishing a PoC session, and to a PoC terminal. To this end, the present invention allows a PoC user who establishes a PoC session to grant a media transmission right to a PoC client that wants to grant a media transmission right through his / her client. By doing so, the user of the PoC client that actually needs media transmission in the established PoC session acquires the media transmission right, thereby enhancing the efficiency of the PoC session operation.

Media transfer rights, INVITE, session participation

Description

METHOD AND SYSTEM AND METHOD AND SYSTEM FOR TRANSMISSION RIGHT ON ESTABLISHMENT OF POC SESSION BACKGROUND OF THE INVENTION 1. Field of the Invention [

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 media transmission rights to a relative PoC user, And a PoC terminal.

With the breakthrough of mobile communication and the expansion of communication network, a wider variety of services and applications using mobile phones are being provided. In addition, the PTT service is widely used for a conventional radio or TRS (Trunked Radio (PTT)) service, etc. In addition, a PTT service has been extended to a location service, a multimedia service, a PTT System, etc.), as well as instant messenger and status display.

Currently, the establishment of a standard for a PoC (PTT over Cellular) service (PoC) service that uses the PTT concept using a mobile communication network is actively being discussed. Characteristics of a PoC service distinguished from existing mobile communication services One of them is that the user belongs to multiple sessions so that they can make calls while moving between sessions as required. The requirement that the user should be able to talk while moving a plurality of sessions, that is, Is specified in the requirements of the Open Mobile Alliance (OMA), an organization that defines mobile communications services.

On the other hand, a PoC call service among PoC services will be described. In order to use a PoC call service, a PoC user registers a PoC address of its own PoC client in a SIP / IP core. At this time, the SIP / IP core stores information about the PoC client based on the request of the PoC client. Therefore, when another PoC user tries to make a call to the PoC group, he or she first registers his / her information in the SIP / IP core and transmits a call request to his / her SIP / IP core network using the group identification information transmitted from the XDMS . At this time, the SIP / IP core performs address determination and domain positioning using the requested PoC user information, and then transmits the PoC call request to the home PoC server in which the requesting PoC user is registered. The PoC server prepares a PoC session for this 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 a call request for clients in the intra domain, the PoC server performs both PF and CF functions. The PoC server managing the requested PoC client uses the information of the PoC client transmitted to the PoC client and performs a positioning process of the SIP / IP core network, and then makes a call request to the corresponding PoC client. When a PoC client requesting a PoC call sends an OK response to the PoC client requesting the call through its PoC client, the PoC call is opened.

In this way, when a PoC user opens a PoC session using his / her PoC client in the PoC system, the first media transmission right is given to the PoC client requesting establishment of the session. Hereinafter, a flow of granting a media transmission right when a current PoC session is opened will be described with reference to FIG.

The PoC client A is a PoC session establisher and transmits a session invitation request message to a PoC server A (PF: Home Server) as its home server for establishing a PoC session in step 400. At this time, the session invitation request message may be transmitted in the INVITE message, and the value of the tb_granted parameter is included in the message. The value of the torque burst permission parameter is set to 1, meaning that a PoC server serving as a control server (CF), which collectively manages a PoC session without requiring the PoC client A to separately request a media transmission right to the PoC server It means that you want to give yourself the right to transmit media.

Then, the PoC server A forwards the received session invitation request message to the PoC server X in step 402. Then, the PoC server X confirms the request URI, and transmits a session invitation request message to the PoC client B as a target PoC client through steps 404 and 406. In this case, the target PoC client is assumed to be the PoC client B in FIG. However, at this time, the talk burst permission parameter has nothing to do with the PoC user B because the PoC client A requesting the PoC session establishment is an indication that it wants to acquire the media transmission right. Therefore, the session invitation request message transmitted in steps 404 and 406 does not include the talk burst permission parameter.

When the PoC client B of the PoC client B having received the session invitation request message requests to join the session, the PoC client B transmits a 200 OK message to the PoC server B via the PoC server B as a response message in steps 408 and 410 And participate in the PoC session.

The PoC server X confirming the 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 transmits a response burst message to the PoC client A And informs the PoC client A that the media transmission right will be transmitted.

In step 416, the PoC server X transmits a media transfer right grant message to the PoC client A to grant the media transfer right to the PoC client A. At this time, the media transmission right grant message can be transmitted as a talk burst grant message or a media burst grant message, which is a floor grant message.

After receiving the media transmission right grant message, the PoC client A may transmit a media such as a speech to be transmitted or a video to be transmitted in step 418. The PoC client A may transmit media on the OMA PoC specification (Spec) upon reception of a predetermined message including a torque burst permission parameter having a value of 1 without a media grant message (Floor Grant message).

As described above, in the prior art, even if the PoC client that establishes the PoC session does not send a talk burst request message or a media burst request message, which is a message requesting the media transmission right separately, If the request message indicates that the user desires to receive the media transmission right, the PoC server managing and managing the PoC session gives the right to transfer the media to the PoC client who established the PoC session.

However, in some cases, a user of a relative PoC client participating in a corresponding PoC session needs to transmit media first rather than a user of a PoC client that has established a PoC session. For example, before a user of the PoC client A establishes a PoC session, the user of the PoC client B transmits an instant personal alert message, and the message content is " PoC between the PoC users A and B " Session, the PoC session is not connected due to the absence of the PoC user A, and the user may request to open a PoC session when the user can talk. In this case, the PoC user A requests the PoC session establishment via the PoC client A, but the PoC client B has the media to be actually transmitted through the session.

That is, although the PoC client that is not a session-initiating PoC client and another PoC client participating in the session must transmit the media, the current media transmission right is always given to the PoC client requesting the PoC session establishment at all times.

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

The present invention provides a system for establishing a PoC (Push To Talk) over the Cellular (PoC) session, comprising: a transmitting PoC client for generating and transmitting a session invitation request message; a receiving PoC client; And a PoC server for transmitting the received session invitation request message to the receiving PoC client upon receiving the message, wherein the session invitation request message includes the media transfer right parameter and the PoC client information to be invited, The media transfer right transfer parameter is information indicating that the transmitting PoC client transfers the media transfer right to the receiving PoC client. When the receiving PoC client receives the session invitation request message, it notifies that the media transfer right has been transferred , There is a choice to use media transmission rights The PoC server transmits a response message including a parameter for informing that the media transmission right will be transferred to the PoC server. When receiving the response message, the PoC server transmits a media transmission right grant message for granting a media transmission right to the PoC server Side PoC client.

In addition, the present invention provides a system including a PoC client for transmitting and generating 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 includes a media transmission right assignment parameter And the media transfer rights transfer parameter is information indicating that the transmitting PoC client transfers the media transfer right to one of the receiving PoC clients to invite to the PoC session , And upon receiving the session invitation request message, identifies the receiving-side PoC client that has transferred the media transmission right in the received session invitation request message, and includes a parameter indicating that the media transmission right is transferred to the receiving-side PoC client Session invitation request message And a PoC server for transmitting a session invitation request message for invoking the PoC session to the remaining PoC clients, wherein the receiving PoC client transmits a session invitation request including a parameter indicating that the media transmission right is transferred And transmits a response message to the PoC server including a parameter for informing that the media transmission right is transferred when there is a selection for using the media transmission right, And upon receiving the response message, transmits a media transmission right grant message for granting a media transmission right to the receiving PoC client.

The present invention also provides a system including a PoC client on the transmitting side, a PoC server, and at least one receiving PoC client invited to the PoC session for establishing a predetermined PoC (Push To Talk) over the Cellular A method for establishing a PoC session, the method comprising: transmitting a media transfer message indicating that the sending PoC client has transferred the media transfer right to one of the receiving PoC clients that the sending PoC client wishes to invite to the PoC session Transmitting a session invitation request message including the rights assignment parameter and the receiving-side PoC client information to the PoC server; and receiving, when the PoC server receives the session invitation request message, After confirming the receiving-side PoC client that has transferred the right, The method comprising the steps of: transmitting a session invitation request message including a parameter indicating that the media transmission right is transferred to the client; and receiving a session invitation request message including a parameter indicating that the media transmission right is transferred, Transmitting to the PoC server a response message including a parameter for informing that the media transmission right is to be transferred if there is a selection for using the media transmission right; And transmitting a media transmission right grant message for granting a media transmission right to the receiving PoC client upon receiving the response message.

A PoC terminal for establishing a PoC session in a system including a PoC terminal participating in a PoC session and a PoC PoC (Push To Talk) over the Cellular (PoC) session is established, And transmits the session invitation request message including the media transfer rights transfer parameter indicating that the media transfer right is transferred to the PoC client of one of the receiving PoC clients to invite to the PoC session and the invited PoC client information And transmits a session invitation request message including a parameter indicating that the media transfer right is transferred through the wireless unit to the mobile unit. When a session invitation request message including a parameter indicating that the media transfer right is transferred through the wireless unit is received, A parameter to indicate that the transfer rights will be transferred. And transmitting the response message to the PoC server through the wireless unit.

The present invention allows a PoC user who establishes a PoC session to grant a media transmission right to a PoC client that wants to grant a media transmission right through his / her client. Thus, there is an advantage that the efficiency of the PoC session operation can be improved by acquiring the media transmission right by the user of the PoC client which actually needs media transmission in the opened PoC session.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

First, a PoC system to which the present invention is applied will be described with reference to FIGS. 1 to 3. FIG. In the following, the present invention is applied to a PTT (Push To Talk) system, in particular, a PoC (Ptt over Cellular) system that provides a PTT service using a cellular mobile communication network. Generally, the PoC system uses a Session Initiation Protocol (SIP) protocol and a SIP extension protocol to transmit session participation information of a group call, and uses an XCAP (XML Configuration Access Protocol) protocol to acquire 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 a related network structure.

1, a general PoC system may be configured to include a PoC terminal (User Equipment; UE) 100, an XML document management server (XDMS), and a PoC server 150. In addition, the PoC system may further include an aggregation proxy server 160. These components may be connected through the access network 110, the SIP / IP core network 120, and the remote PoC network 170.

Each of the above-described components will be described as follows.

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

The PoC client 102 is a service requestor built in the PoC terminal 100. The PoC client 102 resides in the PoC terminal 100 and performs network connection for providing a PoC service to the PoC service subscriber. The PoC service subscriber can receive the PoC service through the PoC terminal having the PoC client built therein. In describing the present invention, the term PoC client will be used generically to refer to a terminal having a PoC client and a PoC service subscriber. Further, the reference numerals of the PoC client will be omitted hereafter unless it is particularly required to distinguish them.

The main function of the PoC client is to set up or set up a PoC session in the PoC service subscriber, i.e., the PoC user, or to terminate the established session. In addition, the PoC client performs functions such as creating and delivering a talk burst, supporting an instant personal alert, and authenticating when connected to a PoC service. The PoC client may be connected to the SIP / IP core network 120, which is a SIP / IP multimedia supporting core network, via the access network 110.

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

On the other hand, a PoC service may involve a service to open a group session, such as a conference call. To this end, the OMA specification defines XDM (XML Document Management) client 104 and XDMS 130 (140) for group list service. FIG. 1 shows a common XDMS 130 that can be used in common with PoC XDMS 140 used for PoC service and other service enablers. 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 the PoC client can call through the list of individuals or groups transmitted from the XDMS 130 (140). Meanwhile, the creation, modification, and management of group and group members for the XDMS 130 (140) may be performed over a reliable communication network of a PoC service provider such as the Internet or an intranet. The detailed description of the protocol and the specific contents of the XML document management such as generation, modification and removal of the group list will be omitted.

When the grouping-related request is received from the XDMC 104 for the group service, the aggregation proxy server 160 routes the request to each XDMS 130 (140) according to an appropriate rule.

Next, the PoC server 150 will be described.

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

The PoC server includes a Controlling PoC Function (hereinafter referred to as "CF") for maintaining and managing the PoC session as a whole and a participating PoC Function (hereinafter referred to as "PF" . Functional characteristics of the PoC server will be described with reference to Table 1 and Table 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 plays a role of managing the PoC session as a whole among the functions of the PoC server. In particular, the CF accepts and orders the rights of the PoC clients (floor) Distributes the talk burst requested by the PoC client to all other PoC clients participating in the group call and provides the information of the PoC client attending the group call.

The PF manages the CF and the sessions associated with each PoC client in the PoC session, particularly when the PoC client requests the floor or gives the floor to the PoC client in the CF, as shown in Table 2 below. In addition, PF relays media between CF and PoC clients, transcodes if they use different codecs between them, and in the case of concurrent sessions, when talking in one session, It acts as a filter for 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 the messages using the XCAP protocol in the PoC system and transmits the messages to the corresponding entities.

3 is a diagram for explaining a Controlling PoC Function Block and a Participating PoC Function Block of a PoC server.

Referring to FIG. 3, each of the PoC clients 102-A to 102-D establishes a PoC session by accessing the CF 300 through the PFs 310-A to 310-D. Thereafter, the media for the corresponding utterance of the PoC client that has been given the voice from the CF 300 is transmitted to each PoC client. At this time, the PoC client that has been granted the voice can only make an appropriate remark after confirming the information of the PoC clients participating in the group session.

A process for allowing a PoC client that opens a session in the PoC system configured as described above to transfer the media transfer right to a relative PoC client participating in the session will be described with reference to FIG.

Hereinafter, the user of the PoC client A is referred to as a PoC user A, and the PoC client B is referred to as a PoC user B. It is assumed that the PoC client A is the PoC client B to which the media transfer right is to be transferred. The PoC client is a service requester included in the PoC terminal as described above with reference to FIG. 1, and performs a network connection to provide a PoC service to the PoC service subscriber while resident in the PoC terminal. The PoC user can receive the PoC service through the PoC terminal having the PoC client built therein. In the following description of the present invention, the term PoC client will be used generically to refer to a terminal having a PoC client and a PoC service subscriber. Further, the reference numerals of the PoC client will be omitted hereafter unless it is particularly required to distinguish them.

First, if the PoC user A selects the function of giving the media transfer right to the PoC user B, the PoC client A generates a session invitation request message including the media transfer right transfer parameter (MB_granted_forward) At this time, the value of the media transfer rights transfer parameter included in the session invitation request message is set to '1' to be included in the media information content using the SDP (Session Description Protocol) protocol.

In step 501, the PoC client A transmits the generated session invitation request message to the PoC server A (PF: Home Server), which is the home server of the PoC server A, in step 501 for establishing the PoC session. At this time, the session invitation request message can be transmitted as an INVITE message. Then, the PoC server A serving as the PF transmits the received session invitation request message to the PoC server X acting as the CF in step 502.

Then, the PoC server X confirms the request URI and the media transfer right parameter (MB_grant_forward parameter) included in the session invitation request message, and sends to the PoC client B, which is the transfer destination PoC client, And transmits an invitation request message. At this time, the PoC server X transmits the session invitation request message including the value of the media transfer right notification parameter (MB_grant_ind parameter)

At this time, in the embodiment of the present invention, when the PoC client as the PoC session establisher transmits the session invitation request message to the PoC server, the PoC server includes the media transfer right transfer parameter, and when the PoC server transmits the session invitation request message to the receiving PoC client , Media transfer rights transfer parameter, which is a different parameter from the media transfer rights transfer parameter. However, instead of separately using the media transfer right transfer parameter and media transfer right transfer notification parameter, the PoC server may transmit the media transfer right transfer parameter received when the session invitation request message is transmitted to the receiving-side PoC client as it is.

Then, the PoC client B, which has received the session invitation request message including the media transfer right transfer notification parameter value of 1, informs PoC user B that the media transfer right has been proposed. If there is a choice for the PoC user B to use the media transmission right, the PoC client B includes the value of the media transfer right notification parameter in the response message as 1 and transmits a response message to the PoC server B in step 508. [ At this time, 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 a value of the media transmission right notification parameter in the response message as 0, and in step 508, transmits a response message to the PoC server B send. After receiving the response message, the PoC server B transmits a response message to the PoC server X in step 501. [

In step 512, the PoC server X, which has received the response message including the media transfer right transfer notification parameter, checks whether the media transfer right transfer notification parameter value is 0 or 1 in the response message. That is, the PoC server X performs another operation according to whether the value of the media transfer right transfer notification parameter is 0 or 1.

 If it is determined in step 512 that the PoC client B has approved the transfer of the media transfer right, the value of the media transfer right transfer parameter is set to 1 in the response message, and then, in steps 514 and 516 And sends a response message to the PoC client A. At the same time, in step 517, the PoC server X transmits to the PoC client B a media transmission control protocol (MBCP) defined in the OMA PoC Spec, Allows client B to transfer media. In step 520, the PoC client B, which has received the media transfer right grant message, performs an operation to transmit the media to be transmitted by the PoC user B to the PoC client A. Upon receiving the response message in step 516, the PoC client A can confirm that the PoC client B has acquired the media transmission right through the media transfer rights transfer parameter value " 1 ". In addition, the PoC client A may perform an operation to notify the PoC user A in the same manner that the PoC client B obtains the media transmission right and displays on the screen of the PoC terminal that it intends to transmit the media.

On the other hand, if it is determined in step 512 that the media transmission right transfer notification parameter value is 0, the PoC server X transmits a media transfer right idle state notification (MB_Idle MBCP) message indicating that there is no PoC user having the media transfer right in the current PoC session To the PoC clients A and B participating in the PoC session

In FIG. 5, a method of granting a media transmission right when making a one-to-one call is illustrated. FIGS. 6A and 6B illustrate a method of granting a media transmission right when an ad hoc group call is made. do. 6A and 6B, a user of the PoC client A is referred to as a PoC user A, a PoC client B is referred to as a PoC user B, and a user of the PoC client C is referred to as a PoC user C. It is assumed that the participant is a group including the PoC client B and the PoC client C in the PoC session established by the PoC client A and that the client to which the media transfer right is to be transferred is the PoC client C.

First, the PoC user A must decide which of the PoC session participants wants to give the media transmission right to the user of the PoC client. If a predetermined PoC client to which the media transfer right is to be granted is selected from the PoC user A, the PoC client A sends a session invitation request indicating a client that has selected the media transfer right transfer parameter and the right of session inviter Message. At this time, if there is a client indication that the user has selected to transfer rights, it is not necessary to include the media transfer right transfer parameter since the PoC session initiator knows that he has transferred his / her media transmission right. Of course, both of them can be included. 6A and 6B, it is assumed that the assignment is made to the PoC client C, so that the assignment in the ad hoc session invitee resource-list of the session invitation request message includes a value of Floor_forward = "true" for displaying the selected PoC client .

The generated session invitation request message is shown in FIG. Referring to FIG. 7, " MB_granted_forward = 1 " is included in the session invitation request message as indicated by 702. Also, the URI of the receiving-side PoC clients is equal to 710, and the PoC client that the PoC client A is to transfer the media transmission right includes 720 as " Floor_forward = " true " Indicating that the media transfer right has been transferred to the PoC client C among the < RTI ID = 0.0 > If a PoC client for requesting an invitation to a PoC session to be opened by the PoC client A is one as shown in FIG. 5, a session invitation request message including only the media transfer right transfer parameter may be generated. However, if there are a plurality of PoC clients to request an invitation to a PoC session to be opened by the PoC client A, as shown in FIG. 7, a session invitation request including an indication of a media transfer right transfer parameter and a client Message can be generated. Another embodiment may generate a session invitation request message including only information on which client should be transferred, such as 712, without including both 702 and 712 as shown in FIG.

In the present invention, a difference between a session invitation request message transmitted for establishing a session between a one-to-one call and an ad hoc group call is not related to the content of the present invention, and thus a detailed description thereof will be avoided. However, in order to avoid confusion, in a one-to-one call, a Request URI and a To Header value are values of an address of a PoC client to be invited to a PoC session. In an ad hoc group call, A URI (conf_fac_URI) value used for generating a Request URI and a To Header value is used to generate a conference. Using this value, you can create a resource-list in XML and include the Address value of multiple PoC clients to invite to the PoC session. The " Floor_forward " value, which is an indication of which client to assign to the client in the present invention, is included in the excitation resource-list. In addition, as mentioned above, in the case of an ad hoc group call, the media transmission rights transfer parameter value may or may not be included in the media attribute information of the SDP protocol. It is illustrated as being included in FIG.

In step 601, the PoC client A transmits the session invitation request message generated in step 600 to its PoC server A (PF: Participating PoC Function). At this time, the session invitation request message can be transmitted as an INVITE message. The PoC server A serving as the PF transmits the received session invitation request message to the PoC server X serving as the CF in step 602. [

Then, the PoC server X confirms to the client in the resource-list that the media transmission right has been transferred in the session invitation request message. In other words, check whether the "Floor_forward" value is "true" in the URI of a client. 7 is transmitted to the PoC server X, the PoC server X confirms that the PoC client C is set to have Floor_forward = " true ", and notifies the PoC client C that the PoC client is a transfer target PoC client in step 606 and step 607 The session invitation request message is transmitted through the PoC server C. At this time, the PoC server X transmits the session invitation request message including the value of the media transfer right notification parameter (MB_grant_ind parameter) In step 604 and step 605, the PoC client B, which is another PoC client, transmits a session invitation request message that does not include the media transfer right notification parameter. In this case, the session invitation request message including the media transfer right notification parameter transmitted from the PoC server X to the PoC client C in step 606 can be shown in FIG. FIG. 8 illustrates a portion of the session invitation request message.

Referring to FIG. 8, since the PoC server X transmits a session invitation request message to the PoC client C, the request URI and the To Header value are transmitted to the PoC client C address "sip: PoCClient_C@example.com &Quot; Instead, the value of the content header (Header) indicates the PoC session ID using the conference URI value generated by the URI (conf_fac_URI) used to create the conference. In particular, the parameter for informing that the media transmission right has been transferred in the present invention may include a media transmission right notification parameter (MB_grant_ind parameter) value of 1 in the media attribute information 800 of the SDP protocol like 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, which has received the session invitation request message including the media transfer right transfer notification parameter value of 1, informs the PoC user C that the media transfer right has been proposed. If there is a choice for the PoC user C to use the media transmission right, the PoC client C includes the value of the media transfer right notification parameter in the response message as 1, and transmits the response message to the PoC server C in step 610. At this time, the response message may be a 200 OK message. However, if there is a choice for the PoC user C not to use the media transmission right, the PoC client C includes a value of the media transmission right notification parameter in the response message as 0, and a response message to the PoC server C send. After receiving the response message, the PoC server C transmits the response message received from the PoC server X in step 611. [

In step 612, the PoC server X, which has received the response message including the media transfer right notification notification parameter, checks whether the media transfer right transfer notification parameter value is 0 or 1 in the response message. That is, the PoC server X performs another operation according to whether the value of the media transfer right transfer notification parameter is 0 or 1.

If it is determined in step 612 that the PoC client C has approved the transfer of the media transfer right, the value of the media transfer right transfer parameter is set to 1 in the response message, And sends a response message to the PoC client A. At the same time, in step 618, the PoC server X transmits a media transmission right granting message to the PoC client C to allow the PoC client C to transmit the media.

In step 622, the PoC client C receiving the media transmission right grant message transmits the media to be transmitted by the PoC user C to the PoC server X. The PoC server X receives the media transmission right grant message in step 622 and attends the PoC session in steps 624 and 626 To all the PoC clients. Upon receiving the response message in step 616, the PoC client A can confirm that the PoC client C 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 to notify the PoC user A in the same manner as the PoC client C displays on the screen of the PoC terminal that the PoC client C has acquired the media transmission right.

On the other hand, if it is determined in step 612 that the media transmission rights transfer notification parameter is 0, the PoC server X transmits a media transfer right idle state notification message (MB_Idle MBCP) message indicating that there is no PoC user having the media transfer right in the current PoC session To all PoC clients participating in the PoC session.

5, 6A, and 6B of FIGS. 5, 6A, and 6B, media transmission right is assigned to a PoC client to which a transmission right is transferred by separately transmitting a media transmission right grant message. However, in steps 504 and 506 and 606 and 607 (MBCP_Grant message) to which the media transfer right notification notification parameter included in the session invitation request message transmitted in the step S306 is to grant the media transmission right. In the case where the media transfer right notification parameter serves as a message for granting media transmission right, it is not necessary to transmit a separate media grant right message (MBCP_Grant message) as in steps 517 and 618 One can see the effect of reducing the procedure.

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

FIG. 2 is a schematic 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 a media transmission right when a conventional PoC session is opened;

FIG. 5 is a diagram for explaining granting of a media transmission right to a receiving-side PoC client in a one-to-one communication according to an embodiment of the present invention;

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

7 is a diagram illustrating 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 transmitted from a PoC server to a receiving-side media transmission right grant PoC client according to an embodiment of the present invention;

Claims (15)

1. A system for transferring media transfer rights upon opening a PoC (Push To Talk) over the Cellular session, And a PoC server for transmitting the received session invitation request message to the receiving-side PoC client upon receiving the session invitation request message from the transmitting-side PoC client, The session invitation request message includes media transfer rights transfer parameter and invited PoC client information, and the media transfer rights transfer parameter is information indicating that the transferring PoC client transfers the media transfer right to the recipient PoC client , The PoC server receives a response message from the receiving PoC client to inform that it is to receive the media transmission right, Upon receipt of the response message, the PoC server transmits a media transmission right grant message for granting media transmission right to the receiving PoC client, Wherein the PoC server transmits a response message including a parameter for informing that the media transmission right received from the receiving-side PoC client is to be transferred to the transmitting-side PoC client. 2. The PoC client according to claim 1, When the session invitation request message is received, informing that the media transfer right has been transferred and, if there is a choice not to use the media transfer right, transmitting a response message indicating that the media transfer right will not be transferred to the PoC server A system for transferring media transmission rights. 3. The PoC server according to claim 2, And notifies all PoC clients participating in the PoC session that they are in a media transfer right idle state upon receiving a response message indicating that the media transfer right is not to be transferred. delete A system for transferring media transfer rights, comprising: a transmitting-side PoC client for generating and transmitting a session invitation request message upon opening a PoC session; and a plurality of receiving-side PoC clients, Wherein the session invitation request message includes a media transfer rights transfer parameter and invited PoC client information, wherein the media transfer rights transfer parameter includes a PoC client of one of the receiving PoC clients that the sending PoC client intends to invite to the PoC session The media transfer right is transferred, Upon receipt of the session invitation request message, the receiving-side PoC client confirms the receiving-side PoC client that has transferred the media transmission right in the received session invitation request message, and transmits the session- And a PoC server for transmitting an invitation request message to the remaining PoC clients and transmitting a session invitation request message for inviting the PoC session to the remaining PoC clients, The PoC server receives a response message from the receiving PoC client to inform that it is to receive the media transmission right, Upon receipt of the response message, the PoC server transmits a media transmission right grant message for granting media transmission right to the receiving PoC client, Wherein the PoC server transmits a response message including a parameter for informing that the media transmission right received from the receiving-side PoC client is to be transferred to the transmitting-side PoC client. 6. The PoC client according to claim 5, When the session invitation request message is received, informing that the media transfer right has been transferred and, if there is a choice not to use the media transfer right, transmitting a response message indicating that the media transfer right will not be transferred to the PoC server A system for transferring media transmission rights. 7. The PoC server according to claim 6, And notifies all PoC clients participating in the PoC session that they are in a media transfer right idle state upon receiving a response message indicating that the media transfer right is not to be transferred. delete A PoC server, a PoC server, and at least one receiver-side PoC client invited to the PoC session to open a PoC (Push To Talk) over the Cellular (PoT) session. In a method for transferring rights, A session invitation request message including a media transfer right transfer parameter indicating transfer of the media transfer right to one of the receiving PoC clients to be invited to the PoC session and the receiving PoC client information from the transmitting PoC client Receiving, Upon receipt of the session invitation request message, the PoC server confirms the receiving PoC client that has transferred the media transmission right in the received session invitation request message, and then transmits a parameter indicating that the media transmission right is transferred to the confirmed receiving PoC client Transmitting a session invitation request message including the session invitation request message, Receiving a response message from the receiving PoC client to inform that the media transmission right will be received; And transmitting a media transmission right grant message for granting a media transmission right to the receiving PoC client upon receiving the response message, After performing the process of notifying that the media transfer right has been transferred, Receiving a response message indicating that the PoC server is not to receive the media transmission right from the receiving PoC client when the receiving PoC client selects not to use the media transmission right, A method for transferring media transmission rights. The method as claimed in claim 9, further comprising the step of transmitting a session invitation request message including a parameter indicating that the media transmission right is transferred to the identified receiving PoC client, And transmitting a session invitation request message to the remaining PoC clients for the PoC session invitation. delete 10. The method of claim 9, When the PoC server receives a response message indicating that the media transmission right is not to be transferred, the PoC server informs all PoC clients participating in the PoC session that the media transmission right idle state is present. . 10. The method of claim 9, Further comprising the step of transmitting, to the transmitting-side PoC client, a response message informing that the PoC server receives the media transmission right received from the receiving-side PoC client. A PoC terminal for establishing a PoC (Push To Talk) over the Cellular (PS) session or for transferring a media transmission right to participate in an established PoC session, A wireless unit for sending and receiving a message, Receiving, via the wireless unit, a session invite request message including a media transfer rights transfer parameter indicating transfer of media transfer rights and invited PoC client information, indicating that the media transfer right has been transferred, using the media transfer right A response message indicating that the media transmission right is to be transferred to the PoC server through the wireless unit if there is a selection for the media transmission right and a response indicating that the media transmission right will not be received if there is a selection for not using the media transmission right And a controller for transmitting a message to the PoC server via the radio unit. delete

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