KR20180069685A - WiFi-Direct ah-hoc video communications on smart phones using WebRTC in the disaster situation - Google Patents

Abstract

The present invention relates to a terminal enabling WebRTC-based video communication using Wi-Fi direct in a disaster environment, and a method thereof. A WebRTC-based terminal according to an embodiment of the present invention comprises: a searching unit broadcasting a search message and receiving a search response message as a response thereto; a connection requesting unit transmitting a connection requesting message to a response terminal having transmitted the received search response message, and receiving a connection acceptance message as a response thereto; a connection accepting unit receiving a connection requesting message from a requesting terminal, and transmitting a connection accepting message to the requesting terminal when a connection to the requesting terminal is approved; a connection managing unit managing an ad-hoc network in which included are the approved requesting terminal and the accepting terminal having transmitted the connection accepting message; an image storage unit storing image information; and an image transceiving unit transmitting the acquired image information to the ad-hoc network in a WebRTC manner, or receiving the image information having been transmitted from the ad-hoc network in the WebRTC manner so that the received image information is able to be transmitted to a target terminal included in the ad-hoc network.

Description

Web-based WiFi-Direct ah-hoc smartphone video communication in a disaster environment (WiFi-Direct ah-hoc video communications on smart phones using WebRTC in the disaster situation)

The present invention relates to a smart phone and its method for performing WiFi-direct communication based on Web Real-Time Communication (WebRTC) in a disaster environment. More particularly, the present invention relates to an apparatus and method for forming an ad-hoc network with neighboring terminals and communicating with a general apparatus included in an external backbone network through the ad-hoc network.

Recently, a lot of attention has been paid to disaster preparedness. In a disaster environment, since the communication infrastructure such as LTE can be disconnected, the function of the portable terminal is very limited in the distress and disaster situations where the Internet and communication environment are disconnected It is impossible to request the rescue using the terminal, and it is inevitable to secure the communication means. Therefore, the task of securing easy-to-reach communication means seems to be very important, and smartphones, which almost all people carry at all times in the past, are useful every week in terms of their use. They send rescue requests using smart phones, The probability of survival for the victim and the rescue requester will increase exponentially.

If you do not have a communication infrastructure like LTE, you can consider an ah-hoc network technology that allows you to connect and connect directly with nearby devices. The ah-hoc network technology makes it possible to configure an ah-hoc network using LTE's D2D technology or WiFi and Bluetooth. However, the current ah- Apple's iOS offers a configuration of an ah-hoc network based on Bluetooth, and only a WiFi-Direct technology capable of configuring a limited ah-hoc network through WiFi is possible.

Due to the limitations of Bluetooth itself, the configuration of ah-hoc network using Bluetooth is not suitable for video transmission, the transmission distance is limited, and the configuration of ah-hoc network based on WiFi-Direct There exists a group owner and there are constraints that can be configured only for a wireless terminal with a hop distance centered on the group owner. Recently, Open Garden provided a API called MeshKit, which provides a limited API as a technology capable of P2P networking over several hops, but has confirmed that it does not provide enough capacity to transmit images.

While many real-time communications are already available through many applications or services on the Internet, downloading of native apps or plug-ins is required. Now WebRTC, a specification for real-time communication without plug-ins in HTML5, has been developed as open source and is now available in various browsers such as Chrome, Opera, Firefox, and also integrated into WebKitGTK + and Qt native framework. It can be applied to various devices in the future.

Accordingly, it is required to provide a technology for providing a video call according to WebRTC based on Wi-Fi direct technology in a disaster situation, or to provide a smart phone implementing the technology.

Korea Patent No. 0-1611485

According to another aspect of the present invention, there is provided a method and terminal for forming a connection based on a Wi-Fi direct connection with a terminal included in an ad-hoc network and transmitting a stored video or a real-time video.

The technical objects of the present invention are not limited to the above-mentioned technical problems, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a WebRTC-based terminal including a search unit broadcasting a search message and receiving a search response message in response to the search message; A connection request unit for transmitting a connection request message to the response terminal which has transmitted the received search response message and receiving a connection acceptance message in response thereto; A connection accepting unit for receiving a connection request message from the requesting terminal and transmitting a connection acceptance message to the requesting terminal if the connection to the requesting terminal is granted; A connection manager for managing an ad-hoc network including the accepted request terminal and the acceptance terminal that has issued the connection acceptance message; An image storage unit for storing image information; And transmitting the obtained image information to the ad-hoc network in a WebRTC manner so that the obtained image information is delivered to a target terminal included in the ad-hoc network, or receiving image information transmitted from the ad-hoc network in a WebRTC manner And a video transmitting / receiving unit.

According to another aspect of the present invention, there is provided a WebRTC-based image transmission method including broadcasting a search message; Receiving a search response message from a response terminal in response to the search message; Transmitting a connection request message to the response terminal; Receiving a connection acceptance message in response to the connection request message from the response terminal; The response terminal is included in an ad hoc network; Obtaining image information; Generating video streaming including the video information and information on a target terminal to which the video information is to be transmitted; Transmitting the video streaming to a relay terminal which is one of terminals included in the ad-hoc network; And transmitting the video streaming to the target terminal through the relay terminal.

According to the present invention as described above, when a communication disaster occurs and a communication infrastructure can not be used, a smart phone and an ad-hoc network are configured based on Wi-Fi direct technology, Ali has the effect of enabling storage video or real-time video communication.

1 is an illustration for explaining video communication using a WebRTC-based terminal in a disaster situation according to an embodiment of the present invention.
2 is a configuration diagram of a WebRTC-based terminal according to an embodiment of the present invention.
3 is a signal flow diagram of a WebRTC-based video communication method according to an embodiment of the present invention.
4 is a signal flow diagram of a WebRTC-based video communication method according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

1 is an illustration for explaining video communication using a WebRTC-based terminal in a disaster situation according to an embodiment of the present invention. Referring to Fig. In the event of a disaster, video communication using a WebRTC-based terminal according to an embodiment of the present invention will be described.

The first terminal 100, the second terminal 110, the third terminal 120, the fourth terminal 130 and the fifth terminal 140 shown in FIG. 1 are connected to a WebRTC based on the first embodiment of the present invention. Terminal. The WebRTC-based terminal according to the embodiment of the present invention can perform video communication using the WebRTC method in a wireless communication environment based on Wi-Fi direct. The WebRTC-based terminal may be a smart phone, a tablet, a notebook or a smart TV, but this is merely an example, and is not limited thereto.

For convenience of explanation, the first terminal 100 and the second terminal 110 are assumed to be terminals of a firefighter or rescue party in a disaster scene. The third terminal 120 is assumed to be a terminal of a firefighter waiting in a fire truck, the fourth terminal 130 is a representative terminal of a disaster relief center, and the fifth terminal 140 is a doctor terminal of an ambulance.

Figure 1 illustrates an example of a disaster situation. The disaster situation assumes a situation where a communication infrastructure does not operate due to a fire or the like. Firefighters or rescue personnel, who own the first terminal 100 and the second terminal 110 respectively, may take images of the fire scene and deliver the images to an ambulance or disaster relief headquarters that is on the scene. According to an embodiment of the present invention, a WebRTC-based terminal forms an ad-hoc network of wireless communication using Wi-Fi direct with neighboring terminals, and displays the captured image on a WebRTC system using the ad- To the terminal of the final recipient.

In order to form the ad-hoc network, the first terminal 100 searches for other terminals in the vicinity using WiFi-Direct based wireless communication. The first terminal 100 forms an ad-hoc network with the third terminal 120, which is the group owner in response to the search. The second terminal 110 searches for a terminal existing in the vicinity using Wi-Fi direct, and forms an ad hoc network through the third terminal 120 responding to the search. The fourth terminal 130 and the fifth terminal 140 also form an ad-hoc network through the group owner, and can be connected to a slave as a group owner or a slave when they later connect with other terminals.

When the ad-hoc network is formed, the first terminal 100 transmits an image communication request message to be transmitted to the fourth terminal 130 to the ad-hoc network in order to deliver the captured image to the fourth terminal 130 do. Since the second terminal 110 is included in the ad hoc network of the first terminal 100, the video communication request message can be transmitted to the second terminal 110. When the video communication request message is received as the group owner, the third terminal 120 transmits the video communication request message to the second terminal 110 included in the ad-hoc network of the third terminal 120, And transmits a video communication request message. At this time, if there is no connection between the first terminal 100, the second terminal 110 or the third terminal 120 and the second terminal 110 or the fourth terminal 130, When it is established, the real time image is preferentially processed and then the stored image is transmitted. The fourth terminal 130 transmits the video communication acceptance message to the third terminal 120 in response to the video communication request message. The video communication acceptance message is transmitted to the first terminal 100 via the third terminal 120 along the path opposite to the path through which the video communication request message is transmitted.

When the video communication acceptance message is received, the first terminal 100 determines that the fourth terminal 130 is connected to the ad-hoc network. If the video streaming is transmitted to the fourth terminal 130, As shown in FIG. The video streaming may include the photographed video information and information about the fourth terminal 130. The information about the fourth terminal 130 is information indicating the destination of the video streaming, and may be the identification information of the fourth terminal 130, for example.

In the first terminal 100, the image information may be transmitted using WebRTC (Web Real-Time Communication). WebRTC is an application program interface (API) designed to allow web browsers to communicate with each other without the help of a plug-in. WebRTC is a draft presented by the World Wide Web Consortium (W3C) and can be used for voice calls, video calls, peer to peer (P2P) file sharing, and so on. WebRTC is supported by Web browsers such as Chrome, Opera, and Firefox, and terminals equipped with these Web browsers can make voice or video calls with other terminals in real time without installing separate applications. For example, most smartphones have Web browsers such as Chrome, Opera, and Firefox, so you can use WebRTC to make video calls without having to install separate applications or plug-ins.

As described above, when a disaster occurs and a problem arises in the communication infrastructure, the WebRTC-based terminal according to the embodiment of the present invention forms an ad hoc network of WiFi direct-based wireless communication with another WebRTC- . The WebRTC-based terminal can perform video communication using the WebRTC method using the ad-hoc network. Therefore, when the base network can not be used in a disaster situation, video communication can be performed through collaboration between terminals.

2 is a configuration diagram of a WebRTC-based terminal according to an embodiment of the present invention. Referring to FIG. 2, the configuration of the WebRTC-based terminal 100 according to an embodiment of the present invention will be described in detail.

The WebRTC-based terminal 100 includes a search unit 220, a connection request unit 230, a connection admission unit 240, a connection management unit 210, a WiFi interface 270, an image storage unit 260, a video transmission / 250, a WebRTC module unit 280, and a video display unit 290.

The WiFi interface 270 is a wireless communication interface for transmitting or receiving data based on WiFi-Direct. Wi-Fi Direct is a Wi-Fi standard that allows direct wireless data communication between terminals without a wireless access point. For example, a smartphone with an android operating system (OS) supports Wi-Fi Direct on the Android OS. Since WiFi Direct is a standard technology, detailed description is omitted in order to avoid duplication of explanation.

The search unit 220 can search for other WebRTC-based terminals existing in the vicinity in order to form an ad hoc network. The search unit 220 broadcasts a search message using the WiFi interface 270, and receives a search response message in response to the search message. The search message is a message for searching for another WebRTC-based terminal existing in the vicinity. Upon receiving the search message, the WebRTC-based terminal can broadcast a search response message in response thereto. The search unit 220 may receive the search response message from one or more other WebRTC-based terminals in response to the search message. Hereinafter, the terminal that transmitted the received search response message is referred to as the response terminal.

The connection request unit 230 may request the formation of an ad hoc network to another WebRTC-based terminal existing in the vicinity. The connection request unit 230 may transmit a connection request message to the response terminal which has transmitted the received search response message and receive the connection acceptance message from the response terminal in response thereto. The connection request unit 230 may transmit a connection request message to all or a part of the response terminals that have transmitted the search response messages for each of the one or more search response messages received by the search unit 220. [ The connection request unit 230 may transmit the connection request message using the WiFi interface 270 and receive the connection acceptance message.

The connection accepting unit 240 may accept an ad-hoc network formation request of another WebRTC-based terminal existing in the vicinity. The connection admission unit 240 may receive a connection request message from the requesting terminal and may transmit a connection acceptance message to the requesting terminal if the connection to the requesting terminal is approved. The connection admission unit 240 may receive the connection request message using the WiFi interface 270 and may transmit the connection acceptance message.

When the connection request message is received, the connection admission unit 240 can receive the approval of the request terminal. For example, the connection admission unit 240 may display information about the request terminal on the display module of the input unit. When a signal indicating approval of the displayed request terminal is received from the user, The requesting terminal can be approved.

The connection management unit 210 can form and manage an ad hoc network. The connection management unit 210 can form and manage an ad-hoc network including the request terminal with which the connection is approved and the acceptance terminal that is the terminal that has issued the connection acceptance message. To this end, the connection management unit 210 may maintain and manage a neighboring terminal list related to peripheral terminals included in the ad hoc network and existing at a distance of one hop from the WebRTC-based terminal 100. The connection managing unit 210 may add the requesting terminal to the neighboring terminal list when the connection accepting unit 240 approves the connection of the requesting terminal. When the connection acceptance message is received from the connection request unit 230, the connection management unit 210 may add the acceptance terminal, which is the terminal that sent the received connection acceptance message, to the peripheral terminal list.

In addition, when the neighboring terminal list is empty, the connection management unit 210 may provide a search start signal to the search unit 220 to search for a WebRTC-based terminal existing in the vicinity. The search unit 220 provided with the search start signal may broadcast the search message.

The image storage unit 260 may include a camera module and may store images captured by the camera module as image information. In addition, it can store images received from other terminals. Thereafter, when the connection management unit 210 is connected to another terminal, the stored image is transmitted when there is no real time image. That is, when the connection through the ad-hoc network is not secured, the image storage unit 260 may save an image or store an image received from another terminal, and request a transmission of the stored image to the image transmission / reception unit when a new connection is made .

The image transmitting / receiving unit 250 may transmit the acquired image information to the ad-hoc network using the WiFi interface 270, or may receive image information from the ad-hoc network. In the following description, when data is transmitted to an ad hoc network, it means that the data is transmitted to any terminal included in the neighboring terminal list.

The image transmitting / receiving unit 250 may transmit an image communication request message including identification information of a target terminal to which the image information is to be received to the ad hoc network. When the video transmission / reception unit 250 receives the video communication acceptance message in response to the transmitted video communication request message, the video transmission / reception unit 250 may transmit the acquired video information to the target terminal. As mentioned earlier, the real-time image has priority over the stored image.

The image transmitting / receiving unit 250 may use the WebRTC module 280 to transmit the acquired image information to the target terminal. The WebRTC module unit 280 can convert image information into a data format according to the WebRTC. The image transmitting / receiving unit 250 may generate image streaming including the image information converted by the WebRTC method and information on the target terminal. The information about the target terminal may be information for identifying the target terminal. The video transmitting / receiving unit 250 can transmit the video stream to the ad-hoc network using the WiFi interface 270.

The video transmitting / receiving unit 250 may receive video streaming from the ad hoc network. The video is basically broadcasted. When the transmission is made to another terminal, the other party can be selected. If the connection is disconnected when the other terminal is designated, the video is stored in the video storage unit and the stored video is transmitted when the connection is established . If the information about the target terminal included in the video streaming does not match the terminal information of the terminal, the video streaming is resent to the ad-hoc network. When the information about the target terminal included in the video streaming matches the terminal information of the terminal, the video information included in the video streaming may be displayed on the video display unit 290. If the image information is the WebRTC method, the image display unit 290 can restore the image information of the WebRTC system to the image information before the conversion using the WebRTC module unit 280, and display the restored image information .

3 is a signal flow diagram of a WebRTC-based video communication method according to an embodiment of the present invention. Referring to FIG. 3, a WebRTC-based video communication method according to an embodiment of the present invention will be described. In order to describe the WebRTC-based video communication method, it is exemplified that video data is transmitted to the fourth terminal 130, which is the terminal of the disaster management person in the first terminal 100, which is the terminal of the rescue person shown in FIG. Explain.

The first terminal 100 broadcasts a search message to the second terminal 110, which is one of terminals included in the ad hoc network (S100). The first terminal 100 broadcasts a search message for searching for other WebRTC-based terminals existing in the vicinity to a wireless communication network connected via Wi-Fi direct connection. At this time, the first terminal 100 can send a message as a group owner. If the terminal that received the message belongs to another group or is a group owner, the first terminal 100 enters the group as a slave. The first terminal 100, the second terminal 110 and the fourth terminal 130 transmit and receive data on a wireless communication network connected via a Wi-Fi direct connection when the third terminal 120 is set as a group owner, do.

The first terminal 100 receives the search response message from the third terminal 120 (S105). In the search response message, the third terminal 120 sends a message of searching for neighboring nodes first as a group owner. When the first terminal 100 receives the search response message, the first terminal 100 can recognize the third terminal 120 as a neighboring terminal.

The first terminal 100 transmits a connection request message to the third terminal 120 (S110). The connection request message is a message for requesting the second terminal 110, which is located in the vicinity of the first terminal 100, to form an ad hoc network.

The first terminal 100 receives a connection acceptance message from the third terminal 120 (S115). When the connection request message is received from the first terminal 100, the third terminal 120 may determine whether to approve the connection request of the first terminal 100. The third terminal 120 transmits the connection acceptance message to the first terminal 100 when the first terminal 100 is approved to form an ad hoc network.

The first terminal 100 receives a video communication request message for requesting a video call with the fourth terminal 130 from the third terminal 120 to the second terminal 110 (S120). The first terminal 100 is connected to the second terminal 110 connected to the ad hoc network among the terminals located around the first terminal 100 for video communication with the fourth terminal 130 included in the ad hoc network, And transmits a communication request message.

When the video communication request message is received, the third terminal 120 transmits the video communication request message to another terminal included in the ad-hoc network in the vicinity of the second terminal 110, Message to the fourth terminal 130 (S125).

The fourth terminal 130 receives the video communication request message and transmits the video communication acceptance message to the ad hoc network when the video communication is permitted (S130). The video communication acceptance message may be delivered to the second terminal 110 in the ad hoc network.

When the video communication acceptance message is received, the third terminal 120 transmits the video communication acceptance message to the first terminal 100 (S135).

When the video communication acceptance message is received from the third terminal 120 included in the ad-hoc network, the first terminal 100 transmits the WebRTC real-time video stream to the third terminal 120 (S140). The first terminal 100 converts the acquired image information into a WebRTC-type image, and generates a WebRTC real-time image stream including identification information of the fourth terminal 130, which is a destination terminal, and the converted image. The first terminal 100 transmits the WebRTC real-time image stream to the third terminal 120 included in the ad-hoc network so that the WebRTC real-time image stream is transmitted to the fourth terminal 130. [

The third terminal 120 transmits the WebRTC real-time video stream received from the first terminal 100 to the fourth terminal 130 (S145). Since the destination included in the WebRTC real-time video stream is the fourth terminal 130, the third terminal 120 transmits the WebRTC real-time video stream to the ad-hoc network to be transmitted to the fourth terminal 130.

The first terminal 100 transmits a video end request message to the third terminal 120 when the video call ends (S150). When the first terminal 100 receives a signal indicating the end of the video call from the user of the first terminal 100, the first terminal 100 transmits the video end request message to the fourth terminal 130, And transmits the video end request message to the terminal 110.

The third terminal 120 transmits the video end request message received from the first terminal 100 to the fourth terminal 130 (S155). Since the destination of the received video end request message is the fourth terminal 130, the second terminal 110 transmits the video end request message to the ad-hoc network so that the video end request message is transmitted to the fourth terminal 130 .

When the fourth terminal 130 receives the video end request message, the fourth terminal 130 transmits a video end acceptance message to the ad-hoc network (S160). The video end acceptance message transmitted from the fourth terminal 130 is received by the third terminal 120 in the ad hoc network.

The first terminal 100 receives the video end acceptance message from the third terminal 120 included in the ad hoc network (S165). The third terminal 120 transmits the video end acceptance message to the first terminal 100 when the video end acceptance message is received from the ad hoc network. The first terminal 100 ends the video call with the fourth terminal 130 when the video end acceptance message is received.

4 is a signal flow diagram of a WebRTC-based video communication method according to another embodiment of the present invention. Referring to FIG. 4, a WebRTC-based video communication method according to an embodiment of the present invention will be described. 4, the same processes as those of FIG. 3 are performed except S240 to S250, and a duplicate description thereof will be omitted.

When the video communication acceptance message is received from the third terminal 120 included in the ad-hoc network, the first terminal 100 determines whether there is a real-time video (S240). When the first terminal 100 has a real-time image, the first terminal 100 transmits the WebRTC real-time image stream to the third terminal 120 as shown in FIG.

If the first terminal 100 does not have a real-time image, the first terminal 100 generates the image stream using the image stored in the image storage unit, and transmits the image stream stored in the WebRTC to the third terminal 120 (S245).

The first terminal 100 converts the acquired image information into a WebRTC format image and generates a WebRTC stored image stream including identification information of the fourth terminal 130, which is a destination terminal, and the converted image. The first terminal 100 transmits the WebRTC stored video stream to the third terminal 120 included in the ad hoc network so that the WebRTC stored video stream is transmitted to the fourth terminal 130. [

The third terminal 120 transmits the WebRTC stored video stream received from the first terminal 100 to the fourth terminal 130 (S250). Since the destination included in the WebRTC stored video stream is the fourth terminal 130, the third terminal 120 transmits the received WebRTC stored video stream to the ad-hoc network to be transmitted to the fourth terminal 130 .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: WebRTC-based terminal, first terminal
110: second terminal
120: Third terminal
130: fourth terminal
140: the fifth terminal

Claims (13)

A searching unit broadcasting a search message and receiving a search response message in response to the searching message;
A connection request unit for transmitting a connection request message to the response terminal which has transmitted the received search response message and receiving a connection acceptance message in response thereto;
A connection accepting unit for receiving a connection request message from the requesting terminal and transmitting a connection acceptance message to the requesting terminal if the connection to the requesting terminal is granted;
A connection manager for managing an ad-hoc network including the accepted request terminal and the acceptance terminal that has issued the connection acceptance message;
An image storage unit for storing image information;
And transmits the obtained image information to the ad-hoc network in a WebRTC manner so that the obtained image information is delivered to a target terminal included in the ad-hoc network, or to receive image information transmitted from the ad- Comprising:
WebRTC based terminal. The method according to claim 1,
And a WiFi interface for sending and receiving messages based on WiFi Direct,
The search unit may search,
Broadcasting the search message using the WiFi interface, receiving the search response message,
The connection request unit,
Transmitting the connection request message using the WiFi interface, receiving the connection acceptance message,
Wherein the connection accepting unit comprises:
Receiving the connection request message using the WiFi interface, transmitting the contact acceptance message,
The image transmitting /
And transmitting and receiving video information of the WebRTC system using the WiFi interface,
WebRTC based terminal. The method according to claim 1,
And an input unit for receiving an input signal from a user of the WebRTC-based terminal,
The connection request unit,
When the input unit receives an input signal for selecting one of the response terminals, transmits the connection request message to the selected response terminal,
Wherein the connection accepting unit comprises:
And transmitting the connection acceptance message to the requesting terminal when the input unit receives an input signal for approving one of the requesting terminals,
WebRTC based terminal. The method of claim 3,
The connection management unit,
Forming and managing the ad hoc network including the selected response terminal and the authorized request terminal,
WebRTC based terminal. The method according to claim 1,
The connection management unit,
And outputting a signal to the search unit so that the search message is broadcast when there is no terminal included in the ad hoc network.
WebRTC based terminal. The method according to claim 1,
The image transmitting /
When the video communication acceptance message is received from the ad-hoc network in response to the video communication request message transmitted to the ad-hoc network, the video communication apparatus transmits the video information of the WebRTC scheme to the ad- And transmits the image stored in the image storage unit when there is no real-time image,
WebRTC based terminal. The method according to claim 1,
A video display unit for displaying the received video information when the video transmitting / receiving unit receives the video information of the WebRTC system; ≪ / RTI >
WebRTC based terminal. The method according to claim 1,
The image transmitting /
And transmits the image communication request message including the identification information of the terminal to which the acquired image information is to be received to the relay terminal, which is one of the terminals included in the ad-hoc network. When the image communication acceptance message is received in response thereto, And transmitting the WebRTC video stream including the identification information about the target terminal and the video information to the relay terminal,
WebRTC based terminal. The search message being broadcast;
Receiving a search response message from a response terminal in response to the search message;
Transmitting a connection request message to the response terminal;
Receiving a connection acceptance message in response to the connection request message from the response terminal;
The response terminal is included in an ad hoc network;
Obtaining image information;
Generating video streaming including the video information and information on a target terminal to which the video information is to be transmitted;
Transmitting the video streaming to a relay terminal which is one of terminals included in the ad-hoc network; And
And transmitting the video streaming to the target terminal via the relay terminal.
WebRTC - based image transmission method. 10. The method of claim 9,
The search message broadcasting, the search response message reception, the connection request message transmission, the connection reception message reception,
[0003] In a wireless communication system based on Wi-Fi direct,
WebRTC - based transmission method. 10. The method of claim 9,
Wherein the step of transmitting a connection request message to the response terminal comprises:
Selecting one of the terminals that have transmitted the received search response message as a response terminal; And
And transmitting the connection request message to the selected response terminal.
WebRTC - based image transmission method. 10. The method of claim 9,
Wherein the step of generating the video streaming comprises:
Converting the image information into a WebRTC format; And
And generating the image stream including the converted image information and the identification information of the target terminal,
WebRTC - based image transmission method. Wherein the step of generating the video streaming comprises:
And generating the video stream using the video information of the WebRTC system when the real time video exists, and generating the video stream using the video stored in the video storage unit when the real time video is not present Transmission method.

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