KR20050061188A - Video communication service method for pear to pear type mobile phone - Google Patents

Abstract

The present invention relates to a technology for providing a video call service directly between two terminals in a video call without going through a server. The present invention includes a first step of attempting to access a data call to a PDSN by inputting telephone number information of a receiver terminal at a caller terminal and assigning an IP address therefrom; The caller terminal sends the IP address information and its own phone number assigned to the other party's phone number to the receiver terminal by SMS, and the receiver terminal releases the data call according to the recipient's connection rejection or request, or makes a data call to the PDSN. A second process of sending; The receiver terminal attempts to connect with the caller terminal based on the IP address of the caller terminal included in the received SMS, and is achieved by a third process of starting a video communication with the caller terminal through an RTCP, RTP, or RTSP connection. .

Description

One-to-one mobile video call service method {VIDEO COMMUNICATION SERVICE METHOD FOR PEAR TO PEAR TYPE MOBILE PHONE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peer-to-pear video call service, and more particularly, to a one-to-one mobile video call service method for providing a video call service directly from two terminals without going through a server.

H.323 is an ITU-T standard for transmitting multimedia videoconferencing data over packet-switched networks such as TCP / IP. This includes the LAN standard for high quality video and the Internet standard for transmitting low frequency video over slow lines as high as 28.8 Kbps.

In order to perform a video call service using the H.323 in a mobile phone, the following components are required.

First, a terminal has the ability to communicate with audio (required), video (optional) and data (optional) when conducting 1: 1 communication or conference. it means. The terminal may communicate in real time with a gatekeeper, gateway, or other terminal in real time. For example, Microsoft's Netmeeting.

Second, the gateway is a device that allows a terminal connected to the Internet network to communicate in real time with a terminal connected to a public switched telephone network (PSTN).

Third, the gatekeeper performs functions such as address translation and access control for the H.323 terminal, and is a device for notifying the location of the gateway to the terminal or for managing bandwidth. .

Fourth, the MCU (Multipoint Control Unit) is composed of a multipoint controller and a multipoint process, and is a device required for voice or video conferencing.

Conventional mobile phone video call service uses the H.323 protocol to establish a session with both subscribers by obtaining a counterpart's IP address through a gatekeeper and then using the RTCP (real-time transport control) in both terminals. It is a method of receiving video call service through Protocol (RTP), Real-time Transport Protocol (RTP), and Real-Time Streaming Protocol (RTSP) protocols. Since the resources of the server must be used on both sides, it is currently being serviced with an information fee of 400 won per 10 seconds.

As such, in the conventional video call service method of a mobile phone, a service must be provided through a server at all times. Therefore, an information service fee must be paid to a communication service provider at each time, and the H.323 protocol includes various sub-protocols. , H.245, H.261, H.263).

Accordingly, it is an object of the present invention to provide a one-to-one video call service directly from two terminals when performing a video call service without going through a server.

The first feature of the present invention is that both subscriber stations exist and there is no server (directory server or ILS-Internet Service server) that establishes a session in between.

According to a second aspect of the present invention, when a video call service is performed, the caller transmits his or her IP address information through a short message (SMS) to the receiver, so that the receiver accesses the IP address of the received SMS.

 A one-to-one mobile video call service method according to the present invention comprises: a first process of inputting telephone number information of a receiver terminal at a caller terminal to attempt a data call connection to a PDSN and assigning an IP address from the PDSN; The caller terminal enters the dormant state, and transmits the IP address information and its own phone number assigned to the other party's phone number to the receiver terminal by SMS, and the receiver terminal exits the dormant state according to the receiver's connection rejection or request. Releasing the data call or sending a data call to the PDSN; A third party that attempts to connect with the caller terminal based on the IP address of the caller terminal included in the received SMS, and the caller terminals come out of a dormant state and start video communication with each other through an RTCP, RTP, or RTSP connection; It will be described in detail with reference to Figures 1 and 2 attached to the video call service process of the present invention made as described above.

Data exchanged through H.323 is composed of media streams such as audio, video, and data, and control signals such as call signaling, registration, and admission. . Among them, the voice standard according to G.711 must be supported, and if it supports video, it must support H.261, H.263, and if it supports data, it must support T.120. The media stream is transmitted on the RTP and RTCP protocols for reliable transmission based on TCP / IP, and H.245 and H.225 are used for control signals.

In FIG. 1, the Q.931 Call Setup part and the RAS Gatekeeper interface part in the block indicated by the bold solid line are replaced by the service method according to the present invention. That is, Q.931, which is a protocol for connecting two terminals, is performed using SMS, and does not require the RAS gatekeeper interface because it does not go through a server in the middle.

Hereinafter, a one-to-one mobile phone video call service process according to the present invention will be described in detail with reference to FIG. 2.

The caller terminal which wants to start a video call enters the phone number information of the receiver terminal and starts the corresponding service. At this time, internally, a data call is first made and an IP address is allocated from a PDSN (Packet Data Serving Node). Also, it loads RTSP server program so that receiver terminal can connect (communication connection) internally and waits for client (receiver terminal) to connect to specific port.

Then, the caller terminal releases the traffic channel and enters (transitions) a dormant state, and then transmits the IP address information and its own phone number assigned to the other party's phone number to the receiver terminal via SMS. ③

In this case, when the receiver rejects the connection, the receiver terminal transmits an SMS to the caller terminal indicating that the receiver rejects the connection, and the caller terminal receiving the message exits the dormant state and releases the data call.

The transmitted SMS is for a video call service, and is transmitted to the other party with a specific TI value assigned for the video call service to distinguish it from the general SMS.

The receiver terminal receiving the SMS determines the message through the TI value in the message and based on the telephone number information of the sender terminal, a message "Video call service request from XX is requested. Would you like to connect?" If it accepts the connection, it sends a data call to the PDSN and attempts to connect with the calling terminal based on the IP address of the calling terminal included in the received SMS.

Accordingly, the caller terminals entering the dormant state exit the dormant state due to the connection attempt of the receiver terminal and start video communication with each other through the RTCP, RTP, RTSP connection.

As described in detail above, the present invention enables the two terminals to provide a one-to-one video call service directly through a server without performing a server, so that the user pays a separate information fee in addition to the packet fee from the user's point of view. There is an advantage that you do not have to.

1 is a protocol stack structure diagram of an H.323 terminal showing an application part of the present invention.

2 is a signal flow diagram illustrating a process of a one-to-one mobile video call service method according to the present invention.

Claims (4)

A first step of attempting to access a data call to a PDSN by inputting telephone number information of a receiver terminal at a caller terminal and assigning an IP address therefrom; The caller terminal sends the IP address information and its own phone number assigned to the other party's phone number to the receiver terminal by SMS, and the receiver terminal releases the data call according to the recipient's connection rejection or request, or makes a data call to the PDSN. A second process of sending; And a third step of the receiver terminal attempting to connect with the caller terminal based on the IP address of the caller terminal included in the received SMS, and start the video communication with the caller terminal through the RTCP, RTP, and RTSP connections. One-to-one mobile phone video call service method. The method of claim 1, wherein the first process comprises loading an RTSP server program to allow the receiver terminal to connect, and waiting for the receiver terminal to be connected to a specific port. The method of claim 1, wherein the second process comprises displaying a message on the screen, “A video call service request has been requested from XX. Would you like to connect?”. The method of claim 1, wherein the second process comprises transmitting the fact to the caller terminal via SMS when the receiver rejects the connection.