KR20090131854A - Push-to-talk over celleular box provided in push-to-talk over celleular system and method for processing media data thereof - Google Patents

Abstract

PURPOSE: A PoC(Push-to-talk over Cellular) box provided from a PoC system and a media data processing method thereof are provided to transmit in a real time media data requested from a PoC client who does not participate in a session. CONSTITUTION: A data converting unit(64) converts media data received from a PoC server into stream data. A session information generating unit(66) generates session control information for the converted stream data. A data storage unit(68) stores the converted stream data and the session control information. A second control unit(74) determines whether the received media data are transmission data of a streaming type or not. The second control unit controls the data converting unit in order to convert the media data to the stream data.

Description

PUC box provided by the POC system and method for processing media data by the same

The present invention relates to a PoC box provided by a PoC system and a media data processing method thereof.

Due to the breakthrough in mobile communication and expansion of communication networks, various services and applications using mobile phones are being provided. In addition, the needs of users are diversified, and beyond the simple call service, the service is expanding to a location service and a multimedia service PTT (Push To Talk) service. In particular, the PTT service supports various additional functions such as instant messenger and status display, as well as group calls and voice calls, which were conventionally available in radio or trunked radio system (TRS).

Currently, the establishment of standards for Push-to-talk Over Cellular (PoC) service that introduces such a PTT concept into a mobile communication network is actively discussed. One of the characteristics of the PoC service, which is distinguished from the existing mobile communication service, is that a user belongs to a plurality of sessions, and thus, the user can make a call while moving between sessions as necessary. The requirement for a user to be able to make calls over multiple sessions is specified in the requirements of the Open Mobile Alliance (OMA), an organization that defines mobile communication services.

Meanwhile, in order to further expand the PoC service, OMA PoC Release 2 considers a Poc Box service similar to a voice mailbox. PoC box service refers to allowing a user who cannot participate in a one-to-one or group session in real time to join a specific physical or logical system on behalf of his client. At this time, the PoC box stores the media transmitted to the client in the session and later transmits the stored media at the request of the PoC client.

Currently, there is no suggestion on how the PoC box defines how to handle media in a session. Therefore, in implementing a PoC service, a method of processing media transmitted to a PoC box and a method of providing media stored in a PoC box to a PoC client need to be defined.

An object of the present invention is to provide a method and apparatus for a PoC box to process media data in a PoC system.

In a PoC system including a push-to-talk over cellular (PoC) server and a PoC box connected to the PoC server, the PoC box processes media data by receiving media data from a PoC server. Storing the temporary data, converting the temporarily stored media data into stream data which is data that can be transmitted in a streaming method capable of real time playback, generating session control information for the converted stream data, and Storing stream data and session control information.

In the Push-to-talk Over Cellular (PoC) system according to the present invention, a PoC box for processing media data together with a PoC server is stream data, which is data that can be transmitted by a streaming method capable of real-time playback of media data received from a PoC server. And a data conversion unit for generating session control information for the converted stream data, and a data storage unit for storing the converted stream data and session control information.

According to the present invention, there is provided a PoC box provided by a PoC system and a media data processing method thereof.

In addition, the PoC box can live stream the media data requested by a PoC client who has not participated in the session, and can stream the media data in real time so that the PoC client can display the media data without completing the reception.

In addition, the PoC box can transmit only the portion of the media data required by the PoC client by transmitting the media data in real time, thereby reducing the amount of data transmitted and reducing the waiting time for the PoC client to receive the media data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are denoted by the same reference numerals wherever possible. In the following description and the annexed drawings, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a diagram illustrating a PoC system according to an embodiment of the present invention.

The PoC system according to the present embodiment includes a PoC client 10, a PoC server 20, and a PoC box 30.

The PoC client 10 is a service requester embedded in a PoC terminal, and performs network connection for providing PoC service to a PoC service subscriber while resident in the PoC terminal. In addition, the PoC service subscriber is provided with the PoC service through the PoC terminal in which the PoC client 10 is embedded. Hereinafter, the term 'PoC client' will be used as a generic term for a terminal in which the PoC client 10 is embedded and a PoC service subscriber.

The PoC client 10 sets up a PoC session in the PoC service subscriber, that is, a PoC user, or joins an existing session, and ends the preset session. In addition, the PoC client 10 may perform a function of creating and delivering a talk burst, a function of supporting an instant personal alert, an authentication function when accessing a PoC service, and the like.

The PoC server 20 is connected to a Session Initiation Porotocol (SIP) / Internet Portocol (IP) core network (not shown) to provide PoC service to the PoC client 10. The PoC 20 server performs the overall PoC control function (Controlling PoC Function) to maintain and manage the PoC session established between the PoC client 10. In addition, the PoC server 20 may perform a PoC Participating Function (Participating PoC Function) for maintaining a session for joining a PoC session established for one-to-one or multi-party calls between PoC clients 10.

PoC box 30 stores the media data transmitted from PoC server 20. Media data stored in the PoC box 30 may include audio data, video data, voice, text, image, and the like. The PoC box 30 according to the present embodiment stores the PoC box 10 in the PoC box 30 when the PoC client 10 does not receive media data generated in another session other than the session in which the PoC client 10 participates.

For example, assume that there is a PoC client 10 in which a first and a second session are set. In addition, it is assumed that the PoC client 10 is participating in the first session and media data to be transmitted to the PoC client 10 is generated in the second session. If the PoC client 10 is participating in the first session, the PoC client 10 cannot participate in the second session and thus cannot receive media data. The PoC server 20 transmits and stores the media data of the second session, which the PoC client 10 cannot receive, to the PoC box 30. The PoC box 30 transmits the media data to the PoC client 10 when the PoC client 10 terminates the connection with the first session.

In this embodiment, the PoC client 10 has described a case in which the media data generated in another session other than the session in which the PoC client 10 does not receive the media is generated in the participating session. The data may be set in advance to be transmitted and stored in the PoC box 30.

2 is a flowchart illustrating a method of processing media data in a PoC system according to an embodiment of the present invention.

The PoC server 20 transmits media data to the PoC box 30 (S102). In this case, the PoC box 30 may temporarily store the media data received from the PoC server 20. The PoC server 20 transmits and stores the media data to the PoC box 30 when the PoC client 10 that is the destination of the media data cannot receive the current media data, such as participating in another session. .

The PoC box 30 converts the media data received from the PoC server 20 into stream data (S104). Stream data refers to the conversion of media data into data capable of real-time streaming.

The PoC box 30 generates session control information for stream data (S106), and stores stream data and session control information (S108). The session control information includes information on the stream data, for example, the file name of the media data before conversion, the file name of the stream data after the conversion, the PoC client ID (ID) of the PoC client 10 to receive the media data, and the stream data. It can be created including the type and size (capacity) of the, the time the media data is transmitted from the PoC server 20, the location where the stream data is stored.

When the PoC client 10 can receive the media data, the PoC server 20 informs the PoC client 10 that the media data has been received (S110). The PoC server 20 according to the present embodiment may inform the PoC box 30 that the media data is converted into stream data and stored. The PoC client 10 accesses the PoC box 30 and requests to transmit the media data (S112). In this case, the PoC client 10 may include the PoC client ID of the PoC client 10 in the transmission request and transmit the same.

When the PoC box 30 receives the media data transmission request from the PoC client 10, the PoC box 30 determines stream data corresponding to the media data requested by the PoC client 10 using the session control information (S114). The PoC box 30 may search for session control information having a PoC client ID that matches the PoC client ID included in the PoC client's transmission request, and find out the corresponding stream data using the retrieved session control information.

The PoC box 30 transmits the corresponding stream data through a Realtime Transport Protocol (RTP) (S116). The PoC client 10 reproduces the stream data received from the PoC box 30 in real time (S118).

When the PoC box 30 transmits the stream data through the RTP method, the PoC client 10 may control and reproduce the transmitted stream data. For example, when the PoC client 10 wants to play the video from the beginning of 0 minutes and 0 seconds, instead of starting from 0 minutes and 0 seconds, the PoC client 10 reads the PoC box 30 ) Can be requested. In addition, the PoC box 30 may first transmit the stream data of the portion requested by the PoC client 10 to the PoC client 30, and the stream data corresponding to the remaining portions may be transmitted to the PoC client 30. You can also do this after sending.

3 is a block diagram illustrating a schematic configuration of a PoC client and a PoC box in a PoC system according to an embodiment of the present invention.

The PoC client 10 includes a first communication interface 42, a key input unit 44, a multimedia player 46, a memory 48, and a first controller 50.

The first communication interface 42 performs a wired / wireless communication function of the PoC client 10. The first communication interface unit 42 according to the present embodiment communicates with the PoC server 20 and the PoC box 30. In addition, the PoC server 20 may be connected to other PoC clients to transmit and receive data. The PoC client 10 according to another embodiment includes a radio frequency (RF) transmitter (not shown) for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver (not shown) for low noise amplifying and downconverting a received signal. C) and the like.

The key input unit 44 is provided with keys for receiving numbers and letters and keys for setting various functions to receive input from a user. The key input unit 44 according to the present embodiment may detect a key input according to the transmission and reception of the RTP method.

The key input unit 44 according to the present embodiment may include a key for reproducing audio or video data, for example, a key such as play, stop, fast forward, rewind, and pause.

The memory 48 may be composed of a program memory and a data memory. The memory 46 stores various kinds of information necessary for controlling the operation of the PoC client 10. The memory 48 according to the present exemplary embodiment may store media data or stream data transmitted from the PoC box 30.

The multimedia player 46 reproduces the multimedia data stored in the memory 48. The multimedia player 46 according to the present exemplary embodiment may reproduce the stream data transmitted from the PoC box 30 in real time.

The first controller 50 controls the overall operation of the PoC client 10. When the stream data is received by the PoC client 10, the first controller 50 according to the present embodiment may reproduce the transmitted stream data in real time through the multimedia player 46. In addition, the PoC box 30 may be requested to receive key inputs such as play, stop, fast forward, rewind, and pause through the key input unit 44, and to transmit stream data corresponding to the received key input. .

The PoC box 10 includes a data converter 64, a session information generator 66, and a data storage 68, and further includes a second communication interface 62 and a second controller 74. Can be configured.

The second communication interface unit 62 may perform communication with the PoC client 10 and the PoC server 20. The second communication interface unit 62 receives the media data transmitted from the PoC server 20 and transmits the stream data stored in the data storage unit 68 to be described later to the PoC client 10. The second communication interface unit 62 according to the present embodiment may receive a transmission request message requesting transmission of media data from the PoC client 10. In addition, when the media data requested by the PoC client 10 is not converted into stream data, the second communication interface unit 62 is stored in the data storage unit 68 under the control of the second control unit 74, which will be described later. The media data may be transmitted to the PoC client 10.

The data converter 64 converts the media data transmitted from the PoC server 20 into stream data. To this end, the data converter 64 divides the media data into packet units under the control of the second controller 74 described later. Hereinafter, media data divided into packet units will be referred to as a "media packet." The data converter 64 dividing the media data into at least one media packet generates RTSP time information corresponding to each media packet. In addition, the data converter 64 adds the generated RTSP time information to the media packet. This converts the media data into stream data.

The RTSP time information is time information of each media packet divided by the data converter 64, which is occupied by the media packet in the total running time when the stream data is reproduced in real time by the PoC client 10. It may include information on the reproduction time of the part. For example, it is assumed that audio data having a total reproduction time of 5 minutes has been converted into stream data by the data converter 64. It is also assumed that the data converter 64 divides the audio data into media packets each having a playback time of one minute. If the playback time of any one of the media packets divided by the data converter 64 is '1 minute 1 second to 2 minutes 0 second' of the total playback time of the stream data, then the total playback time of the media packet is 1 minute. The RTSP time information may include that the media packet occupies a playback time corresponding to '1 minute 1 second to 2 minutes 0 second' of the playback time of the entire stream data.

In addition, it is assumed that the PoC client 10 requests stream data from the PoC box 30 to play from a portion corresponding to '1 minute 1 second' of the entire playback time. The PoC box 30 in the PoC system according to the present embodiment prior to the media packet corresponding to '1 minute 1 second to 2 minutes 0 second' before the media packet corresponding to '0 minute 0 second to 1 minute 0 second'. May transmit to the PoC client 10. That is, the PoC box 10 transmits a media packet preferred by the PoC client 10 first by giving different priority to media packets classified according to RTSP time information, and then transmits other media packets later. You can adjust the turn. At this time, the PoC client 10 may receive a command such as playing, stopping, fast forwarding, rewinding, pausing, etc. of the pre-installed key input unit 44, and transmit a transmission request accordingly to the PoC box 30.

The session information generator 66 generates session control information for the stream data converted by the data converter 64. The session control information includes a file name of media data before conversion to stream data, a file name of stream data after conversion, PoC client ID (ID) of PoC client 10 to receive media data, type and size of stream data (capacity). ), The time at which the media data is transmitted from the PoC server 20, the location where the stream data is stored, and the like. In addition, the session control information may include information on each media packet constituting the stream data, that is, RTSP time information, file type, size (capacity), storage location, and the like of each media packet.

The session information generator 66 according to the present exemplary embodiment generates session control information for media data received from the PoC server 20 under the control of the second controller 74. The session control information for the media data includes the file name of the media data, the PoC client ID (ID) of the PoC client 10 to receive the media data, the type and size (capacity) of the stream data, and the media data from the PoC server 20. Can be created including the time at which the data was transmitted, the location where the stream data was stored, and the like.

In addition, the session control information generated by the session information generator 66 as described above may be in the form of Extensible Markup Language (XML).

The data storage unit 68 stores the stream data converted by the data converter 64 and the session control information generated by the session information generator 66. The data storage unit 68 according to the present embodiment may store media data transmitted from the PoC server 20.

In addition, the data storage unit 68 according to the present embodiment may include a session information storage unit 70 for storing session control information and a stream data storage unit 72 for storing stream data. The stream data storage unit 72 may store the media data transmitted from the PoC server 20 under the control of the second controller 74 to be described later.

The second controller 74 controls the overall operation of the PoC box 30.

The second controller 74 according to the present embodiment determines whether the media data received from the PoC server 20 is streamable data. For example, if the media data is audio data or video data, the second controller 74 may determine the media data as streamable data, and if the media data is text, image, or voice, it may be determined as non-streamable data. have.

When the received media data is streamable data, the second controller 74 controls the data converter 64 to convert the media data into stream data. In addition, the session information generating unit 66 is controlled to generate session control information for the stream data. When the media data transmitted from the PoC server 20 is not streamable data, the second controller 74 controls the session information generator 66 to generate session control information for the media data.

As a result, the PoC box 20 according to the present exemplary embodiment may manage the media data requested by the PoC client 10 using only session control information stored in the data storage 68. The PoC box 30 may find out whether the media data requested by the PoC client 10 exists by searching for session control information stored in the PoC box 30. The second control unit 74 retrieves session control information including the same information as the file name of the media data transmitted from the PoC client 10 among the session control information stored in the data storage unit 68 to search for the corresponding media data or stream. It is easy to find out whether the data is stored in the PoC box 20.

4 is a flowchart illustrating a method in which a PoC box processes media data according to an embodiment of the present invention.

The second communication interface 62 of the PoC box 30 receives media data from the PoC server 20 (S122). At this time, the data storage unit 68 of the PoC box 30 may temporarily store the media data transmitted from the PoC server 20 to the second controller 74 under low load.

The data converter 64 divides the received media data into packet units (S124), and generates RTSP time information corresponding to each of the media data divided into packet units, that is, media packets (S126). The data converter 64 adds corresponding RTSP time information to the media data in the packet unit, that is, the media packets (S128). In this way, the media data is converted into the stream data by going through steps S124 to S128.

When the media data is video data including both video and audio data, the data converter 64 may first separate media data into video and audio data. Thereafter, the data converter 64 divides the video data and the audio data into packet units and generates RTSP time information corresponding to each media packet.

The session information generation unit 66 generates session control information corresponding to the stream data (S130). Session control information includes information on stream data. The session control information includes a PoC client ID, a file name of the media data, a storage location where the stream data is stored, a time at which the media data is transmitted from the PoC server 20, a total playing time of the stream data, and the like. In addition, the session control information may include information about media packets constituting the stream data.

The data storage unit 132 stores stream data and session control information (S132). The data storage unit 132 according to the present exemplary embodiment may store stream data and session control information in association with each other under the control of the second controller 74.

5 is a flowchart illustrating a method in which a PoC box processes media data in a PoC system according to an embodiment of the present invention.

The PoC box 30 receives media data from the PoC server 20 (S142). The second controller 74 of the PoC box 30 determines whether the received media data is data that can be reproduced by a streaming method (S144). The second controller 74 according to the present exemplary embodiment may determine the type of the media data by analyzing the media data received in step S142. If the type of the media data is, for example, audio data, video data, or the like, the second control unit 74 determines that the data can be reproduced by the streaming method. On the other hand, if the type of media data is, for example, an image, text, voice, or the like, it is determined that the data is not playable by the streaming method.

If the media data is not data that can be reproduced by the streaming method (S144: No), the media data is stored in the data storage unit 68 (S146). Thereafter, the session information generation unit 66 of the PoC box 30 generates session control information for the media data under the control of the second controller 74, and the generated session control information is stored in the data storage unit 70. It becomes (S150).

If the media data is data that can be reproduced in a streaming manner (S144: YES), the data converter 64 converts the media data into stream data, and the converted stream data is stored in the data storage 68 (S150). . The session information generator 66 generates session control information for the stream data converted in step S150, and the generated session control information is stored in the data storage 68.

When the PoC client 10 requests to transmit the media data to the PoC box 30 (S152), the second control unit 74 of the PoC box 30 and the media data transmitted from the PoC client 10 It is determined whether session control information having the same PoC client ID exists (S154). The PoC client 10 according to the present embodiment may transmit a transmission request message to the PoC box 30 in order to request that the media data is transmitted to the PoC box 30. In addition, the transmission request message may include a PoC client ID of the corresponding PoC client. Accordingly, the second controller 74 of the PoC box 30 may determine the PoC client ID that has requested the transmission of the media data by analyzing the transmission request message. The second controller 76 determines whether a PoC client ID identical to the PoC client ID included in the transmission request message exists among the session control information previously stored in the PoC box 30.

If there is no session control information having the same PoC client ID (S154: No), the second controller 74 of the PoC box 30 controls the second communication interface 62 to provide the media data to the PoC client. It may be informed that there is no (S156).

If session control information having the same PoC client ID exists (S154: YES), the second controller 74 determines whether the corresponding media data is converted into stream data (S158). Since the session control information includes information on media data or stream data corresponding to the session control information, the second control unit 74 converts the media data corresponding to the session control information into stream data through the session control information. You can find out.

If the media data is not converted into stream data (S158: No), the media data is transmitted to the PoC client 10 (S160). When the media data is converted into stream data (S158: YES), the second communication interface 62 of the PoC box 30 transmits the stream data by the RTP method (S162).

When the PoC client 10 receives the stream data from the PoC box 30, the PoC client 10 reproduces the received stream data in real time (S164).

6A is a diagram illustrating a data storage unit according to an embodiment of the present invention, and FIG. 6B is a diagram illustrating stream data according to an embodiment of the present invention.

6A is a block diagram showing the schematic structure of the data storage 68. As shown in FIG. The data storage unit 68 includes a session information storage unit 70 and a stream data storage unit 72. The session information storage unit 70 stores session control information corresponding to media data or stream data. The stream data storage unit 72 stores media data or stream data.

6A illustrates a data storage unit 68 in which session control information and stream data or media data are correspondingly stored. The session information storage unit 70 stores session control information 1 and session control information 2, and the stream data storage unit 72 stores stream data 1 and media data 2 corresponding to the session control information 1 and 2, respectively. have.

6B illustrates an example of stream data transmitted from the PoC box 30 to the PoC client 10. The PoC box 30 may sequentially transmit session control information and stream data to the PoC client 10. The PoC box 30 may transmit session control information to inform the PoC client 10 that media data requested by the PoC client 10 has been converted into stream data. In addition, the PoC client 10 uses the session control information to provide various information on the stream data transmitted from the PoC box 30, for example, the total number of media packets constituting the stream data, and an RTSP corresponding to each media packet. You can find the time information and the storage location where each media packet is stored.

FIG. 6B illustrates a first packet, a second packet, and a third packet, which are media packets corresponding to each session control information, together with session control information. The first packet includes first audio data and first RTSP time information, the second packet includes second video data and second RTSP time information, and the third packet includes third video data and third RTSP time information. . As such, each media packet constituting the stream data may have RTSP time information.

7 is a flowchart illustrating a method in which a PoC box processes media data according to another embodiment of the present invention.

In the present embodiment, a case in which the PoC box 30 receives media data from the PoC server 20, converts the media data into stream data, and stores the converted stream data in another storage device 80 will be described.

The PoC box 30 receives media data from the PoC server 20 and converts the media data into stream data (S172). The PoC box 30 transmits the converted stream data to the preset storage device 80. The storage device 80 stores the stream data transmitted from the PoC box 30 (S176). The storage device 80 informs the PoC box 30 of the storage location of the stream data (S178). PoC box 30 generates and stores the session control information including the stream storage location (S180).

When the PoC client 10 requests that the media data be transmitted (S182), the PoC box 30 determines the storage location of the stream data using the session control information (S184). Since the session control information corresponding to each stream data includes a storage location of the stream data, the PoC box 30 may inform the PoC client 10 of the storage location of the stream data using the session control information.

The PoC box 30 informs the PoC client 10 the storage location of the corresponding stream data (S186). The PoC client 188 connects to the storage device 80 in which the stream data is stored, and requests to transmit the stream data (S188). The storage device 80 transmits stream data to the PoC client (S190).

1 is a diagram illustrating a PoC system according to an embodiment of the present invention;

2 is a flowchart illustrating a method of processing media data in a PoC system according to an embodiment of the present invention;

3 is a block diagram showing a schematic configuration of a PoC client and a PoC box in a PoC system according to an embodiment of the present invention;

4 is a flowchart illustrating a method in which a PoC box processes media data according to an embodiment of the present invention;

5 is a flowchart illustrating a method of processing media data by a PoC box in a PoC system according to an embodiment of the present invention;

6A is a view showing a data storage unit according to an embodiment of the present invention;

6B illustrates stream data according to an embodiment of the present invention, and

7 is a flowchart illustrating a method in which a PoC box processes media data according to another embodiment of the present invention.

Claims (20)

In a PoC system including a push-to-talk over cellular (PoC) server and a PoC box connected to the PoC server, the PoC box processes media data, Receiving the media data from the PoC server and temporarily storing the data; Converting the temporarily stored media data into stream data which is data that can be transmitted in a streaming method capable of real time playback; Generating session control information for the converted stream data; And storing the converted stream data and session control information. The method of claim 1, wherein converting the media data into stream data comprises: Dividing the received media data into packet units; Generating real time streaming protocol (RTSP) time information corresponding to the media data divided into packet units; And adding the generated RTSP time information to the media data of the packet unit, respectively, and storing the added RTSP time information. The method of claim 1, Determining whether the received media data is data that can be transmitted by a streaming method; And converting the media data into the stream data only when the media data is data that can be transmitted by the streaming method. The method of claim 3, Generating session control information for the media data when the media data is not data that can be transmitted through the streaming method; And storing the media data and session control information. The method of claim 1 or 4, wherein the session control information, A PoC client ID of the received media data, The PoC client ID is a media data processing method characterized in that the ID of the receiving PoC client to receive the media data. The method of claim 3, wherein the determining of whether the media data is data that can be transmitted by a streaming method is performed. Determining whether the media data has a running time; And determining the media data as data that can be transmitted by a streaming method when the playback time is provided. The process of claim 1, wherein the generating of session control information on the converted stream data comprises: Generating session control information including a PoC client ID for the media data; And storing the generated session control information corresponding to the media data. The method of claim 5, Receiving a request for transmission of media data from a PoC client, Determining whether there is session control information including a PoC client ID identical to the PoC client ID included in the transmission request; If the session control information exists, determining whether the media data received by the transmission request is converted into stream data and stored using the session control information; And in the case of the converted and stored stream data, transmitting the converted and stored stream data to the PoC client through a Realtime Transport Protocol (RTP). The method of claim 8, And transmitting the media data corresponding to the session control information to the PoC client when it is not the converted and stored stream data. In a PoC box that processes media data with a PoC server in a push-to-talk over cellular system, A data converter for converting the media data received from the PoC server into stream data which is data that can be transmitted in a streaming method capable of real time playback; A session information generation unit for generating session control information on the converted stream data; PoC box comprising a data storage for storing the converted stream data and session control information. The method of claim 10, wherein the data conversion unit, The received media data is divided into packet units, real time streaming protocol (RTSP) time information corresponding to the media data divided into packet units is generated, and the generated RTSP time information is converted into media data of the packet unit. PoC box for converting the media data into the stream data by adding to each of them. The method of claim 10, And determining whether the received media data is data that can be transmitted by the streaming method, and controlling the data converter to convert the media data into the stream data when the data can be transmitted by the streaming method. PoC box. The method of claim 12, wherein the control unit, And if the media data is not data that can be transmitted in the streaming method, controlling the session information generator to generate session control information for the media data. The method of claim 10 or 13, wherein the session control information, A PoC client ID of the received media data, The PoC client ID is a PoC box, characterized in that the ID of the receiving PoC client to receive the media data. The method of claim 12, wherein the control unit, And when the media data has a playback time, determine the media data as data that can be transmitted by the streaming method. The method of claim 10, wherein the session control information, PoC box comprising the PoC client ID (ID) of the media data. The method of claim 12, Further comprising a communication interface for receiving a transfer request of the media data from the PoC client, The controller determines whether the media data received by the transmission request is converted into stream data and stored using the stored session control information. When the converted stream data is stored, the controller stores the converted and stored stream data in real time. PoC box, characterized in that for controlling the communication interface to transmit to the PoC client via a transport protocol. The method of claim 17, wherein the control unit And not the converted and stored stream data, controlling the communication interface unit to transmit the media data corresponding to the session control information to the PoC client. The method of claim 10, wherein the data storage unit, A stream data storage unit for storing the converted stream data; PoC box comprising a session information storage for storing the session control information. The method of claim 17, wherein the control unit, When the transmission request of the media data is received from the PoC client, it is determined whether there is session control information having the same PoC client ID as the PoC client ID included in the received media data. And controlling the communication interface unit to transmit stream data or media data to the PoC client.

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