KR20090025114A - Method and apparatus for transferring data using wireless local area network - Google Patents

Abstract

A data transmission method and an apparatus thereof using WLAN receiving a message according to vendor specific extension and receiving multimedia contents to a communications channel based on VDP are provided to transmit and receive the multimedia contents by defining a message according to vender specific extension. A data transfer device connects a communications channel based on a VDP(Video Distributed Protocol) by receiving the message according to the vendor specific extension. The apparatus receives the multimedia contents to the connected communications channel. The vendor specific extension sets the multimedia information to a part of service capabilities information elements. The apparatus provides the image service by using the received multimedia contents as described above.

Description

Method and apparatus for transferring data using wireless local area network

The present invention relates to a data transmission method and apparatus using near field communication.

Recently, a Bluetooth technology for transmitting AV data wirelessly while moving is being developed. Bluetooth consists of lower layer technology and higher layer technology.

The lower layer technology is mainly related to hardware, such as radio, base band, and link manager, and firmware that operates on the hardware.

The higher layer technology is related to protocols and application software that operate on computers, personal digital assistants (PDAs), mobile phones, and the like.

Bluetooth A / V systems related to audio / video (A / V) systems include the Advanced Audio Distributed Protocol (A2DP), Video Distributed Protocol (VDP), and Audio Video Remote Protocol (AVRTP) profiles standardized by the Bluetooth Special Interest Group (SIG). There is this.

The A2DP and VDP profiles are for transmitting real-time A / V data from an A / V source device that owns A / V data to an A / V sink device that renders A / V data.

However, in order to transmit data using Bluetooth, two channels must be set separately to transmit A / V data by transmitting video data through a VDP channel and audio data through an A2DP channel.

An object of the present invention is to provide a data transmission method and apparatus using short-range wireless communication that can transmit and receive multimedia content in real time based on VDP.

The present invention is characterized by receiving a message according to a vendor specific extension (Vender specific extension) to connect a communication channel based on VDP, and to receive multimedia content through the connected communication channel.

According to the method and apparatus for transmitting data using short-range wireless communication according to the present invention, the multimedia content can be transmitted and received in real time by defining a message according to a vendor specific extension capable of transmitting the multimedia content on a VDP basis.

According to the present invention, the audio / video stream can be transmitted in real time by setting only the VDP channel to set the A2DP channel without separately setting the audio channel A2DP and the video channel VDP to transmit the audio / video stream constituting the multimedia content. There is an effect that can omit unnecessary steps for.

The present invention can perform a video call or video chat using a terminal equipped with a camera as a web camera by transmitting multimedia contents in real time based on VDP, and transmit multimedia contents stored in the terminal in real time streaming based on VDP. There is an effect that can provide a variety of additional functions to the user.

A data transmission method using short-range wireless communication according to the present invention includes: receiving a message according to a vendor specific extension and connecting a communication channel based on a VDP; Receiving multimedia content through the connected communication channel.

In the present invention, the vendor specific extension is characterized by setting the multimedia information in the Service Capability Information Elements of the 'Get Capabilities' message.

In the present invention, the vendor specific extension is characterized by setting the multimedia information in the Service Capability Information Elements part of the 'Set Configuration' message.

In addition, the data transmission method using short-range wireless communication according to the present invention, the step of receiving multimedia content based on VDP; And providing a video service using the received multimedia contents.

In the present invention, the VDP is characterized in that the communication channel is connected by a message according to the vendor specific extension (Vender specific extension).

In the present invention, the video service is characterized in that the video service using the multimedia content to be taken for video calling or video chat or the real-time transmission and reception of the stored multimedia content by streaming.

In addition, the data transmission method using the short-range wireless communication according to the present invention comprises the steps of: connecting a communication channel based on VDP by transmitting a message according to the vendor specific extension (Vender specific extension); Transmitting multimedia content through the connected communication channel.

In the present invention, the vendor specific extension is characterized by setting the multimedia information in the Service Capability Information Elements of the 'Get Capabilities' message.

The vendor specific extension is characterized by setting multimedia information in a service capability information element portion of a 'Set Configuration' message.

In addition, the apparatus for transmitting data using short-range wireless communication according to the present invention includes a transmitter for connecting a communication channel based on VDP and transmitting multimedia content by transmitting a message according to a vendor specific extension. It is characterized by.

In the present invention, the transmitting device is a camera module for receiving an audio / video frame constituting the multimedia content, and an audio / video codec for encoding the audio / video frame or decoding the encoded audio / video frame ( an audio / video codec module, a media file format module for storing the encoded audio / video frame as a media file or for reading and parsing an audio / video frame from the stored file; And a Bluetooth module for real-time streaming the encoded audio / video frame.

In the present invention, the communication channel may be connected on a VDP basis by setting multimedia information in a Service Capability Information Element of the Get Capabilities message.

In the present invention, the communication channel may be connected on a VDP basis by setting multimedia information in a Service Capability Information Element part of a 'Set Configuration' message.

In addition, the apparatus for transmitting data using short-range wireless communication according to the present invention includes a receiving apparatus for receiving a message according to a vendor specific extension, connecting a communication channel based on a VDP, and receiving multimedia content. It is characterized by.

In the present invention, the receiving device is a Bluetooth module for receiving an audio / video frame constituting the multimedia content transmitted in real time based on the VDP, and the audio / video frame received by the Bluetooth module in the application program And a capture source filter module for generating a processable audio / video stream.

In the present invention, the application program is characterized in that the video service, including a video call, video chat program.

In the present invention, the communication channel may be connected on a VDP basis by setting multimedia information in a Service Capability Information Element of the Get Capabilities message.

In the present invention, the communication channel may be connected on a VDP basis by setting multimedia information in a Service Capability Information Element part of a 'Set Configuration' message.

The present invention will be described in detail by taking Bluetooth as an example of short-range wireless communication, and is not limited to the Bluetooth.

In addition, in the present invention, multimedia content is referred to as audio / video data, and the multimedia data may be video data including both audio / video data, image data including only one, image data, and the like.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a transmission structure of multimedia content using Bluetooth according to an embodiment of the present invention.

Referring to FIG. 1, FIG. 1 (a) refers to a device for transmitting / receiving audio / video data using Bluetooth as a source device 11, and a device for transmitting audio / video data. A device for receiving and outputting data is referred to as a sink device 12.

The source device 11 and the sink device 12 may be changed into a source device and a sink device according to a direction for transmitting and receiving data to transmit and receive audio / video data.

FIG. 1 (b) shows a profile stack structure of an audio / video distribution transport protocol (AVDTP), which includes a baseband layer, an LMP layer, an L2CAP layer, an SDP layer, an AVDTP layer, and an application layer. It is composed.

Among them, the baseband layer, the LMP layer, and the L2CAP layer correspond to the first and second layers of the Open Systems Interconnect (OSI) basic reference model.

The SDP layer is a protocol that defines the Bluetooth Service Discovery Protocol and automatically discovers Bluetooth devices.

The AVDTP (Audio / Video Distribution Transport Protocol) layer is a protocol layer that defines a processing procedure or message exchange for transmitting audio / video data in a Bluetooth piconet. The negotiation of parameters of a data stream is carried out. It consists of a signaling entity that performs the transport entity and a transport entity that handles the data stream itself.

The application layer is composed of an entity that sets each parameter of an application service or a transport service in the source device 11 or the sink device 12, and also performs processing for fitting audio / video data to a prescribed packet format.

AVDTP, a protocol for transmitting audio / video streams in the Bluetooth network, is divided into two functions, signaling and streaming.

Streaming defines real-time transmission of audio / video streams, and signaling performs negotiation such as format to receive and process audio / video streams transmitted from a source device at the sink device side.

Conventionally, the A2DP channel has to be set for transmitting an audio stream between the source device 11 and the sink device 12, and the VDP channel has to be set up for transmitting video stream data using the protocol stack structure as described above. The present invention proposes a method for transmitting and receiving an audio / video stream in real time using only the VDP channel 13.

FIG. 1C is a diagram illustrating a sequence of connection establishment in the AVDTP protocol.

The source device 11 connects the sink device 12 to an AVDTP signaling channel.

Here, the structure of the signaling packet of the AVDTP is shown in FIG. 2, and includes a signaling message format for single packets, a signaling message format for start packets, and a signaling packet format for start packets. Signaling message format for continue and end packets.

A stream end point discovery procedure (S11) and a get capabilities procedure (S12) are performed through the connected signaling channel to support which streams the sink device 12 corresponds to and to which sink device the stream corresponds. Get information about audio / video streams.

Here, the structure of the response message of the 'Get Capabilities' procedure (S12) is shown in FIG. 3, and the media type 32 is provided through a service capability information element 31. Information such as a Media Codec Type 33 can be known.

As shown in FIG. 3, the media codec type 33 also supports only the video codec and the audio codec by defining only a case where the media type 32 is an audio type and a video type.

 The present invention defines a multimedia codec as a Vender specific codec of a Vender specific extension (hereinafter referred to as Non-VDP) as shown in FIG. 4 that can transmit a multiplexed audio / video stream when the media type 32 is multimedia. The explanation continues later.

The source device 11 performs a 'Set Configuration' procedure using the audio / video stream information of the sink device 12 obtained through the 'Get Capabilities' procedure (S12) and the audio / video stream information supported by the source device (S13). Connect the streaming channel through which the actual audio / video stream is to be transmitted and received.

Here, the request message of the 'Set Configuration' procedure (S13) is as shown in FIG.

The source device 11 transmits an 'open' procedure (S14) to the sink device 12 so that both the source device and the sink device are in an 'open' state (S15) to transmit and receive audio / video streams in real time. The streaming channel is connected.

Although the source device 11 and the sink device 12 are connected to the A2DP and VDP channels through the sequence as shown in FIG. 1C, the audio stream is transmitted and received through the A2DP channel and the video stream is transmitted and received through the VDP channel. By defining a Vender specific codec in the 'Get Capabilities' procedure (S12), only a VDP channel can be set, and an audio / video stream multiplexed with the VDP channel can be transmitted and received in real time.

In detail, FIG. 6 corresponds to a 'Get Capabilities' Response message for obtaining an audio / video stream supported by the VDP of the sink device 12, and a command message structure of 'Set Configuration'. Vender specific codec structure of Service Capabilities Information Elements.

For example, the Service Capabilities Information Elements 61 of FIG. 6 includes a media type 62 and a media codec type 63, as shown in FIG. 3, and uses a VenderID extension using a vendor specific extension supported by the user defined in FIG. 64, Vender Specific Codec ID 65, Video Codec Specific information 66, and Audio Codec Specific information 67 are included.

Here, the VenderID 64 is an ID of Venders defining a Vender specific codec and is a value changeable according to various Venders.

In addition, the Vender Specific Codec ID 65 is defined as a Vender Specific Audio Codec ID 65-1, a Vender Specific Video Codec ID 65-2, and a Vender Specific Multimedia Codec ID 65-3 according to the media type.

As described above, in the present invention, 'Get Capabilities' response when the multimedia content using the MPEG-4 Simple Profile codec is used as the video stream and the QCELP / EVRC codec is used as the audio stream in real time by setting only the VDP channel. Message and Service Capabilities Information Elements included in the command message of 'Set Configuration' are shown in FIG.

Referring to FIG. 7, the media type 71 is set to multimedia, and the media codec type 72 is undefined. The VenderID 73 sets a user ID (LGE) that defines a Vender specific codec according to the media type 71, and the Vender Specific Codec Type 74 uses an MPEG-4 Simple Profile codec as a video stream and a QCELP codec as an audio stream. Set this used.

Video Codec Specific information (75) sets the level of MPEG-4 Simple Profile based on VDP, VBR (76) is the bit rate, channel (77) is the number of channels, Rate Type (78) Denotes an encoding rate, a sampling frequency 79 sets a sampling frequency, and a bit rate 80 sets an encoding bit rate.

As another embodiment, the 'Get Capabilities' response when the MPEG-4 Simple Profile codec is used as the video stream and the audio stream transmits the multimedia content using the MPEG-1,2 or MPEG-2,4 AAC codec in real time. The Service Capabilities Information Elements included in the (Response) message and the command message of 'Set Configuration' are shown in FIG. 8.

Therefore, the present invention defines a Vender specific codec using a Vender specific extension that can transmit multiplexed audio / video streams without the need to separate and transmit the audio and video streams into two separate channels. Real time transmission using only.

9 is a diagram illustrating a configuration of a data transmission apparatus using short range wireless communication according to an exemplary embodiment of the present invention.

Referring to FIG. 9, a Bluetooth module of a source device includes a connector 91, a stream buffer 92, a streamer 93, and a multiplexer 94. It is configured to include.

The connector 91 establishes and terminates the connection with the sink device, and the stream buffer 92 buffers the encoded audio / video frame in chronological order.

The streamer 93 periodically reads the audio / video frame from the stream buffer 92 according to the streaming time. If the size of the audio / video frame is larger than the maximum transmission size, the streamer 93 divides the frame into media packets ( media packet).

Here, the streamer 93 distinguishes and displays an audio frame or a video frame in the payload type field of the media packet header.

The multiplexer 94 multiplexes the media packet in time order using the time stamp value of the header for the media packet output from the streamer 93, and the multiplexed media packet is It is sent to the sink device based on VDP through the protocol stack.

The sink device includes a connector 95, a stream buffer 96, a streamer 97, and a demultiplexer 98.

The connector 95 establishes and terminates the connection with the source device, and the demultiplexer 98 demultiplexes the media packet received from the source device into audio and video packets and outputs them to the streamer 97.

The streamer 97 parses the media packet and assembles the fragmented audio / video frame and stores it in the stream buffer 96.

The stream buffer 96 outputs the audio / video frame to the audio / video codec or higher application program in accordance with the time played by using a time stamp value.

10 illustrates a streaming service using short-range wireless communication according to an embodiment of the present invention.

Referring to FIG. 10, the mobile terminal 11 operates as a source device and the notebook computer 12 operates as a sink device by connecting to short-range wireless communication (for example, Bluetooth) to transfer multimedia information generated by the mobile terminal to a specific terminal. A streaming service according to an embodiment of the present invention in which a multimedia service such as video chat, VOD, AOD, etc. is performed by real time transmission is illustrated.

For example, FIG. 10 (a) shows a mobile terminal used as a web camera for video chatting by real-time transmission of an image recorded by a camera of a mobile terminal to a laptop, and FIG. 10 (b) shows a video stored in a mobile terminal. The multimedia content may be transmitted to the notebook in real time, and an operation of performing a video call, a video chat, and an audio / video stream with a terminal connected through the Internet is not known in detail.

11 is a diagram illustrating a configuration of a data transmitting and receiving apparatus using short-range wireless communication for performing a streaming service according to an embodiment of the present invention.

Referring to FIG. 11, FIG. 11A illustrates a camera module 111 receiving an image as a source device, and an audio / video codec for encoding an audio / video frame or decoding an encoded audio / video frame. audio / video codec) module 113, a player module 112 that plays decoded audio / video frames, and encoded audio / video frames as media files or audio / video frames from the stored files. Media file format module 114 for reading / parsing, and a Bluetooth module 115 for streaming audio / video frames to external devices in real time.

The audio / video codec module 113 includes an encoder for encoding the audio / video frame recorded from the camera module 111 and a decoder for decoding the audio / video frame. The camera module 111 may include a microphone for receiving audio data.

The media file format module 114 includes a writer for storing the encoded audio / video frame as a media file (eg, mp4, 3g2, 3gp, etc.) and the encoded audio / video from the stored media file. And a reader for reading and parsing the video frame and outputting the audio / video codec module 113 and the Bluetooth module 115.

In addition, the Bluetooth module 115 transmits the encoded audio / video frame to the sink device based on the VDP, and the components of the Bluetooth module 115 are described in FIG. .

In addition, the source device may be a mobile communication terminal equipped with a camera or a terminal equipped with a camera such as a digital camera, and the Bluetooth module may be included as an internal type or connected externally.

FIG. 11B is a sink device, a Bluetooth module 116 for receiving audio / video frames transmitted in real time from a source device based on a VDP, and audio / video from the Bluetooth module 116. And a capture source filter module 117 for receiving an frame and generating an audio / video stream that can be processed by an application program (e.g., video phone, video chat program, etc.).

The Bluetooth module 116 will not be described in detail as described in detail with reference to FIG.

The video capture source filter module 119 divides an audio / video frame received by the Bluetooth module 116 into an encoded audio frame and an encoded video frame. ), An audio / video timesync for synchronizing time sync using the time stamp value of the audio / video frame, and a video decoder for decoding the encoded video frame. and a video streamer for generating a video stream that can be processed by an application program.

The audio capture source filter module 118 includes an audio decoder for decoding encoded audio frames separated in an audio / video splitter, and an audio stream for generating an audio stream that can be processed by an application program. It consists of an audio streamer.

12 is a flowchart illustrating an operation procedure of a first embodiment for implementing a streaming service of the present invention.

11 and 12, an operation procedure for using a mobile communication terminal or a digital camera equipped with a camera as a web camera for video chatting and video calling is performed.

The Bluetooth module 115 of the source device and the Bluetooth module 116 of the sink device are connected to a signaling channel through a protocol stack, and the source device receives information on the sink device through Discovery, Get Capabilities procedures. Get

Here, the sink device information includes media type (eg, audio / video / multimedia) codec information supported by the sink device.

Subsequently, the source device sets up a streaming channel through the set configuration procedure using the information received from the sink device, and the streaming channel, ie, VDP, capable of transmitting a media packet between the source device and the sink device through the open procedure. Connect the channel.

Here, the present invention connects a VDP channel, which is a streaming channel for transmitting audio / video frames, through the Get Capabilities and Set configuration structures proposed in FIGS. 3 to 8.

When the VDP channel is connected, the source device encodes a raw audio / video stream recorded from the camera module 111 into a set codec type, and the encoded audio / video frame is converted into a media file module 114. Is stored in the stream buffer of the Bluetooth module 115 at the same time.

The streamer of the Bluetooth module 115 periodically reads the audio / video frame from the stream buffer according to the streaming time. If the size of the audio / video frame is larger than the maximum transmission size, the streamer fragments the frame. Create a media packet.

Here, the streamer distinguishes and displays an audio frame or a video frame in a payload type field of a media packet header.

A multiplexer multiplexes media packets in a time sequence using a time stamp value of a header for media packets output from a streamer, and the multiplexed media packets are protocol stacks. stack) to the sink device via the VDP channel.

Upon receiving the media packet from the source device, the Bluetooth module 116 of the sink device demultiplexes the audio packet and the video packet through a demultiplexer and outputs it to the streamer, and the streamer parses the media packet. Assemble and store the fragmented audio / video frame in the stream buffer.

In addition, the video capture source filter module 119 reads the encoded audio / video frame from the stream buffer according to the sampling rate, and through the audio / video splitter, the audio frame receives the audio capture source. The audio decoder of filter 118 outputs the video frame to the video decoder.

The audio decoder and the video decoder decode audio / video frames and output them to the audio streamer and the video streamer, and the audio streamer and the video streamer process the decoded audio / video stream in an application such as a messenger or a video phone. Convert it to a possible form and output it to the parent application.

13 is a flowchart illustrating an operation procedure of a second embodiment for implementing a streaming service of the present invention.

11 and 13, an operation procedure of providing a live stream by transmitting a video file stored in a source device to a sink device.

The Bluetooth module 115 of the source device and the Bluetooth module 116 of the sink device are connected to a signaling channel through a protocol stack, and the source device receives information on the sink device through Discovery, Get Capabilities procedures. Get

Here, the sink device information includes media type (eg, audio / video / multimedia) codec information supported by the sink device.

Subsequently, the source device sets up a streaming channel through the set configuration procedure using the information received from the sink device, and the streaming channel, ie, VDP, capable of transmitting a media packet between the source device and the sink device through the open procedure. Connect the channel.

Here, the present invention connects a VDP channel, which is a streaming channel for transmitting audio / video frames, through the Get Capabilities and Set configuration structures proposed in FIGS. 3 to 8.

When the VDP channel is connected, the player module 112 of the source device requests open / read for the video file stored in the media file format module 114, and the encoded audio read / parsing in the media file format module 114. The / video frame is output to the audio / video codec module 113 and stored at the same time in the stream buffer of the Bluetooth module 115.

In this case, when only the file is streamed to the sink device without playing the video file from the source device, the encoded audio / video frame is not output to the audio / video codec module 113 but only to the Bluetooth module 115 to output the stream buffer. Store in

The audio / video codec module 113 decodes the encoded audio / video frame and transmits the encoded audio / video frame to the player module 112 together with the type stamp value. The player module 112 uses the time stamp value to transmit the audio / video stream. Render / play.

The streamer of the Bluetooth module 115 periodically reads the audio / video frame from the stream buffer according to the streaming time. If the size of the audio / video frame is larger than the maximum transmission size, the streamer fragments the frame to provide a media packet ( media packet).

Here, the streamer distinguishes and displays an audio frame or a video frame in a payload type field of a media packet header.

A multiplexer multiplexes media packets in a time sequence using a time stamp value of a header for media packets output from a streamer, and the multiplexed media packets are protocol stacks. The protocol stack transmits the data through the VDP channel to the sink device.

Upon receiving the media packet from the source device, the Bluetooth module 116 of the sink device demultiplexes the audio packet and the video packet through a demultiplexer and outputs it to the streamer, and the streamer parses the media packet ( parsing and fragmenting the audio / video frames and then storing them in the stream buffer.

In addition, a video capture source filter 119 reads the encoded audio / video frame from the stream buffer according to the sampling rate, and through the audio / video splitter, the audio frame is an audio capture source filter. The audio decoder 118 outputs the video frame to the video decoder.

The audio decoder and video decoder decodes the audio / video frame and outputs the audio streamer and the video streamer, and the audio streamer and the video streamer can play the decoded audio / video stream. It converts it into a form that can be processed in the application program and outputs it to the upper application program.

As described above, the present invention has an effect of real-time transmission and reception of multimedia content by defining a message according to a vendor specific extension capable of transmitting multimedia content on a VDP basis.

According to the present invention, the audio / video stream can be transmitted in real time by setting only the VDP channel to set the A2DP channel without separately setting the audio channel A2DP and the video channel VDP to transmit the audio / video stream constituting the multimedia content. There is an effect that can omit unnecessary steps for.

The present invention can perform a video call or video chat using a terminal equipped with a camera as a web camera by transmitting multimedia contents in real time based on VDP, and transmit multimedia contents stored in the terminal in real time streaming based on VDP. There is an effect that can provide a variety of additional functions to the user.

So far, the present invention has been described with reference to the embodiments, and those skilled in the art to which the present invention pertains may implement the above-described detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. There will be. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

1 is a diagram showing a transmission structure of multimedia content using Bluetooth according to an embodiment of the present invention.

2 is a diagram illustrating a signaling packet structure of an AVDTP according to an embodiment of the present invention.

3 is a diagram illustrating a message structure of a 'Get Capabilities' procedure according to an embodiment of the present invention.

 4 is a diagram illustrating a structure of a vendor specific codec of a vendor specific extension (Non-VDP) according to an embodiment of the present invention.

5 is a diagram illustrating a message structure of a 'Set Configuration' procedure according to an embodiment of the present invention.

6 is a diagram illustrating a structure of Service Capabilities Information Elements of Non-VDP according to an embodiment of the present invention.

7 and 8 illustrate concrete examples of the structure of Service Capabilities Information Elements of Non-VDP according to an embodiment of the present invention.

9 is a diagram illustrating a configuration of a data transmission apparatus using short-range wireless communication according to an embodiment of the present invention.

10 is a view showing a streaming service using short-range wireless communication according to an embodiment of the present invention.

11 is a diagram illustrating a configuration of a data transmitting and receiving apparatus using short-range wireless communication for performing a streaming service according to an embodiment of the present invention.

12 is a flowchart showing an operation procedure of a first embodiment for performing a streaming service of the present invention;

FIG. 13 is a flowchart illustrating an operation procedure of a second embodiment for performing a streaming service of the present invention; FIG.

Claims (18)

Receiving a message according to a vendor specific extension and connecting a communication channel on a VDP basis; Receiving multimedia content through the connected communication channel; and receiving data using short-range wireless communication. The method of claim 1, The vendor specific extension is a method for receiving data using short-range wireless communication, characterized in that the multimedia information is set in the Service Capability Information Elements of the Get Capabilities message. The method of claim 1, The vendor specific extension is a method of receiving data using short-range wireless communication, characterized in that for setting the multimedia information in the Service Capability Information Elements (Service Capability Information Elements) portion of the 'Set Configuration' message. Receiving multimedia content on a VDP basis; Providing a video service using the received multimedia content; Data receiving method using a short-range wireless communication comprising a. The method of claim 4, wherein The VDP is a data receiving method using short-range wireless communication, characterized in that the communication channel is connected by a message according to the vendor specific extension (Vender specific extension). The method of claim 4, wherein The video service is a video service using short-range wireless communication, characterized in that the video service including the real-time transmission by using the received multimedia content for video telephony or video chat or streaming. Connecting a communication channel based on VDP by transmitting a message according to a vendor specific extension; Transmitting multimedia content through the connected communication channel; and transmitting data using short-range wireless communication. The method of claim 7, wherein The vendor specific extension is a data transmission method using short-range wireless communication, characterized in that for setting the multimedia information in the Service Capability Information Elements (Service Capabilities Information Elements) part of the 'Get Capabilities' message. The method of claim 7, wherein The vendor specific extension is a method of transmitting data using short-range wireless communication, characterized in that the multimedia information is set in the Service Capability Information Elements of the 'Set Configuration' message. And a transmitter for transmitting a message according to a vendor specific extension, connecting a communication channel based on a VDP, and transmitting multimedia content. The method of claim 10, wherein the transmitting device, A camera module for receiving audio / video frames constituting multimedia content; An audio / video codec module for encoding the audio / video frame or decoding the encoded audio / video frame; A media file format module for storing the encoded audio / video frame as a media file or for reading and parsing the audio / video frame from the stored file; And a Bluetooth module for real-time streaming the encoded audio / video frame. The method of claim 10, The communication channel is a data transmission apparatus using short-range wireless communication, characterized in that the connection is established on the basis of VDP by setting the multimedia information in the Service Capability Information Elements (Service Capabilities Information Elements) of the 'Get Capabilities' message. The method of claim 10, The communication channel is a data transmission apparatus using short-range wireless communication, characterized in that connected to the VDP base by setting the multimedia information in the Service Capability Information Elements (Service Capabilities Information Elements) of the 'Set Configuration' message. And a receiving device for receiving a message according to a vendor specific extension, connecting a communication channel based on a VDP, and receiving multimedia contents. 15. The apparatus of claim 14, wherein the receiver is A Bluetooth module for receiving an audio / video frame constituting multimedia content transmitted in real time based on VDP; And a capture source filter module for generating audio / video frames received by the Bluetooth module as an audio / video stream that can be processed by an application program. Data transmission device. The method of claim 14, The application program is a video transmission device using a short-range wireless communication, characterized in that the video service including a video call, video chat program. The method of claim 14, The communication channel is a data transmission apparatus using short-range wireless communication, characterized in that the connection is established on the basis of VDP by setting the multimedia information in the Service Capability Information Elements (Service Capabilities Information Elements) of the 'Get Capabilities' message. The method of claim 14, The communication channel is a data transmission apparatus using short-range wireless communication, characterized in that connected to the VDP base by setting the multimedia information in the Service Capability Information Elements (Service Capabilities Information Elements) part of the 'Set Configuration' message.

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