KR20050118834A - Vod streaming service system and method thereof - Google Patents

Abstract

The present invention uses a network protocol that can respond appropriately in the VOD streaming system according to the arrival of the report transmitted from the terminal connected through the wireless network to the VOD streaming system, for example, if the report does not arrive within a certain time The present invention relates to a VOD streaming service system and method that can provide a stable streaming service and increase service success rate by preventing interruption of a service due to a loss of a report such as requesting retransmission so that all data can be completed.

Description

VOD STREAMING SERVICE SYSTEM AND METHOD THEREOF

The present invention relates to a VOD streaming service system and method, and more particularly, when a VOD service is performed using a wireless network, such as when a service is unilaterally disconnected from a server because the related information from the terminal to the server is not transmitted properly. The present invention relates to a VOD streaming service system and method that can maintain a stable service by preventing a case of service interruption.

In recent years, with the development of information and communication technology and computers, the Internet has been rapidly developed to provide not only texts and pictures but also videos through the Internet. In addition, unlike the existing pay per view (PPV) service, which requires ordering and waiting for a program, a bidirectional video service, that is, a VOD service, in which subscribers can instantly select and watch a desired program at a desired time, is being provided.

In general, in a VOD service providing system providing a VOD service, the information received from the terminal by the server is all a RR (Receiver Report) posted by a Real-Time Streaming Protocol (RTCP). Here, UDP (User Datagram Protocol) used by RTCP as a network protocol from a terminal to a server transmits data to a partner's address without establishing a connection, so that protocol processing is high-speed or error correction or retransmission of transmitted data is performed. There is no. Therefore, since UDP itself does not guarantee data loss, reports transmitted from the terminal to the server often fail to reach the server.

1 is a diagram illustrating a conventional VOD streaming service structure, and FIG. 2 is a flowchart illustrating a conventional VOD streaming service flow.

First, the conventional VOD streaming service structure will be described with reference to FIG. 1.

The VOD streaming service structure includes a streaming client 14 requesting a VOD streaming service, a web server 30 receiving a corresponding VOD streaming service request through a wireless network, and a corresponding VOD streaming service request through a web server 30. It includes a VOD streaming server 40 for receiving and providing a VOD streaming service, and a client player 12 for receiving and playing VOD streaming data from the VOD streaming server 40.

The VOD streaming server 40 includes a Real-Time Streaming Protocol (RTSP) server 42 that controls a VOD streaming service, and a content server 44 that stores VOD streaming data for streaming content.

Hereinafter, a flow of a conventional VOD streaming service will be described with reference to FIG. 2.

First, the streaming client 14 transmits a session information request message (RTSP: DESCRIBE or SDP) to the RTSP server 42 of the streaming server 40, and the RTSP server 42 responds to the session information request message. Send a response message to the streaming client 14. Accordingly, the streaming client 14 obtains information about the session.

The streaming client 14 transmits a session setup request message (RTSP: SETUP or SDP) to the RTSP server 42 based on the information on the corresponding session, and the RTSP server 42 requests the session setup request. A response message to the message is sent to the streaming client 14. Accordingly, the streaming client 14 establishes and sets up a session with the RTSP server 42.

Accordingly, the streaming client 14 transmits a streaming data transmission request message (RTSP: PLAY) to the RTSP server 42, and the RTSP server 42 sends a response message to the corresponding streaming data transmission request message. Send to the streaming client 14.

Under the control of the RTSP server 42, the content server 44 transmits the corresponding streaming data to the streaming client 14 by using User Datagram Protocol (UDP) / Real-time Protocol (RTP). Accordingly, the user receives the contents of the streaming data through the streaming client 14. At this time, the streaming client 14 transmits a report to the RTSP server 42 of the VOD streaming server 40 using UDP / RTCP.

Accordingly, the streaming client 14 transmits a session or service termination message (RTSP: TEARDOWN) to the RTSP server 42 when the corresponding VOD streaming service ends, and the RTSP server 42 sends the streaming client 14 to the RTSP server 42. ) Sends a response message to the session or service termination message.

In general, the information that the RTSP server 42 receives from the streaming client 14 among the streaming services of the streaming client 14 is all a report posted by the RTCP. Here, the UDP used as the network protocol from the streaming client 14 to the RTSP server 42 transmits data to the other address without establishing a session. In other words, UDP itself does not guarantee for loss of data. Therefore, a case where a report from the streaming client 14 to the RTSP server 42 fails to reach the RTSP server 42 frequently occurs. The operation of the RTSP server 42 will be described below.

First, the RTSP server 42 continues to service until the report arrives. In such a case, the RTSP server 42 sends data unconditionally even in a state in which the network condition is not good enough to perform a service between the RTSP server 42 and the streaming client 14. Therefore, since the RTSP server 42 performs the service even for the data which is not actually serviced to the user, the billing is paid out. This causes a problem in that the user has to pay a fee even though the user has not actually received the service. At the same time, the load through unnecessary work in the wireless network / server becomes large.

Alternatively, the RTSP server 42 unilaterally disconnects the session with the streaming client 14 when a report from the streaming client 14 does not come up within a certain time. In such a case, even if data loss and delay occurs due to a poor network condition for a predetermined time, the service is interrupted due to timeout even when the data is returned to normal again. In this case, even though the service is not actually provided to the user, the problem of being charged is reduced, but the service success rate is drastically deteriorated because the basis for setting the time is inevitably dependent on a simple experimental value.

Accordingly, the present invention is to solve the above problems, by using a network protocol that can make an appropriate response in the VOD streaming system according to the arrival of a report transmitted from the terminal connected via the wireless network to the VOD streaming system, For example, if a report does not arrive within a certain period of time, a request for retransmission can be made to ensure that the entire data is completed. This prevents the service from being interrupted due to loss of the report. It is to provide a VOD streaming service system and method.

VOD streaming service system according to a feature of the present invention

In the VOD streaming system linked to the content server for supplying VOD streaming data at the request of the terminal through a wireless network,

A report receiving unit which receives a report transmitted at regular intervals from the terminal using the VOD streaming service using the VOD streaming data provided from the content server; And

And a service transmission control unit for controlling the VOD streaming service transmission according to a determination result of whether the report reception unit receives the report.

In this case, in the network protocol between the terminal connected through the wireless network and the VOD streaming system, a protocol for transmitting VOD streaming data from the content server to the terminal and a protocol for transmitting a report from the terminal to the report receiving unit. Each uses a different network protocol.

VOD streaming service method according to another feature of the present invention

A method for providing a VOD streaming service in a VOD streaming service system connected through a terminal and a wireless network,

(a) providing a VOD streaming service for a VOD streaming service transmission request from the terminal;

(b) in step (a), receiving a report transmitted at a predetermined period from the terminal according to the VOD streaming service provision;

(c) in step (b), if the report from the terminal is not received for a predetermined time, controlling the service transmission to the terminal,

In a network protocol between a terminal connected through the wireless network and the VOD streaming system, a protocol for transmitting VOD streaming data from the content server to the terminal and a protocol for transmitting a report from the terminal to the report receiving unit are different. It is characterized by using a network protocol.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

3 is a diagram illustrating a VOD streaming service system according to an embodiment of the present invention.

Hereinafter, a VOD streaming service system according to an embodiment of the present invention will be described with reference to FIG. 3. However, in the configuration, the same configuration as in the prior art will be omitted.

As shown in FIG. 3, the VOD streaming service system 500 may include a web server 300 receiving a VOD streaming service start request from the streaming client 140 through the wireless network 200 through the wireless network 200. And a VOD streaming server 400 receiving the VOD streaming service start request through the web server 300 and providing the VOD streaming data according to the VOD streaming service to the client player 120. At this time, the client player 120 receives and plays the VOD streaming data from the VOD streaming server 400.

The VOD streaming server 400 includes a content server including a Real-Time Streaming Protocol (RTSP) server 420 for controlling a VOD streaming service and a content DB 442 for storing VOD streaming data for streaming content. 440). In addition, the RTSP server 420 receives a report coming from the terminal using a predetermined network protocol in the system 500 and determines the response of the system 500 according to whether or not the report is received. According to the decision of the report receiving unit 422, the service transmission control unit 424 for controlling a service provided by the system, for example, if a report does not arrive within a certain time, a request for retransmission or a service interruption due to network disconnection And a service transfer control unit 424 which immediately releases the connection so that a case in which the user is not unfairly charged is not generated.

Hereinafter, a VOD streaming service process according to an embodiment of the present invention will be described with reference to FIG. 4.

4 is a VOD streaming service flowchart using TCP / RTCP as a network protocol transmitted from a streaming client to an RTSP server in the VOD streaming service method according to an embodiment of the present invention.

First, the streaming client 140 of the terminal 100 transmits a session information request message (RTSP: DESCRIBE or SDP) to the RTSP server 420 of the VOD streaming server 400 (S100), and thus the RTSP server 420 ) Transmits a response message to the corresponding session information request message to the streaming client 140 (S110). Accordingly, the streaming client 140 obtains information about the session.

In addition, the streaming client 140 transmits a session setup request message (RTSP: SETUP or SDP) to the RTSP server 420 based on the information on the session (S120), and the RTSP server 420 corresponds to the corresponding session. A response message for the session establishment request message is transmitted to the streaming client 140 (S130). Accordingly, the streaming client 140 sets up and sets up a session for the RTSP server 420.

Accordingly, the streaming client 140 transmits a streaming data transmission request message (RTSP: PLAY) to the RTSP server 420 (S140), and thus the RTSP server 420 responds to the corresponding streaming data transmission request message. The message is transmitted to the streaming client 140 (S150).

In addition, according to the control of the RTSP server 420, the content server 440 uses the User Datagram Protocol (UDP) / Real-time Protocol (RTP) protocol according to a predetermined protocol interface to stream the corresponding streaming data (video / audio streaming). Data) is transmitted to the streaming client 140 (S160). Accordingly, the user may receive the contents of the streaming data through the streaming client 140 and use the received streaming data through the client player 120 to use the VOD streaming service. In this case, the streaming client 140 continuously transmits a report to the RTSP server 420 at a predetermined period (for example, 2 seconds) using the TCP / RTCP protocol according to a predetermined protocol interface in the system (S170). . In this case, the system 500 typically transmits and responds to data using a predetermined protocol between the terminal 100 and the system 500, but may determine a protocol to be used according to a user's needs. Not shown).

Accordingly, when the corresponding VOD streaming service ends, the streaming client 140 transmits a session or service termination message (RTSP: TEARDOWN) to the RTSP server 420 (S180), whereby the RTSP server 420 transmits the streaming. The client 140 transmits a response message to the corresponding session or service termination message (S190).

Hereinafter, the operation of the system in the case of using TCP according to a protocol interface determined as a network protocol from the streaming client 140 to the RTSP server 420 during the VOD streaming service process between the streaming client and the RTSP server will be described below. .

The streaming client 140 receiving the streaming data from the VOD streaming server 400 continuously transmits a report (RR: Receiver Report) to the RTSP server 420 at a predetermined period (for example, every 2 seconds). The report transmitted to the RTSP server 420 transmitted from the streaming client 140 is received by the report receiving unit 422, at which time it is determined whether the report arrives within a predetermined time. The service transmission control unit 424 determines that there is a loss of the report when the report is not received at a predetermined period (for example, every 2 seconds) according to the determination of the report receiving unit 422 and returns to the terminal 100. If the report does not arrive even after requesting retransmission for a certain number of times (for example, requesting three retransmissions once per second), it is determined that there is a problem with the network and is disconnected. If the report is not transmitted to the RTSP server 420 because the network is disconnected, the new protocol (TCP / RTCP) transmits this fact to the RTSP server 420 and the server 400 immediately disconnects.

Therefore, according to the protocol as described above, the server 400 grasps the state of the network in a short time, and if the network state is poor, immediately releases the connection, even if the user is unfairly serviced due to the network situation Can reduce the amount of money charged. In addition, when an error occurs, a request for retransmission of the corresponding part is performed, and the entire data is performed until the transmission is completed, thereby providing stable streaming service and increasing service success rate.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the present invention, by using a network protocol that can make an appropriate response in the VOD streaming system according to the arrival of the report transmitted from the terminal connected through the wireless network to the VOD streaming system, if the report does not arrive, request retransmission and It can provide more stable service by preventing the interruption of service due to report loss by performing the function until all data arrives completely. In addition, since the server can grasp the state of the network in a short time, it is possible to reduce the amount of unnecessary billing to the user by immediately disconnecting when the service is interrupted due to network disconnection.

1 is a diagram illustrating a structure of a conventional VOD streaming service.

2 is a flowchart illustrating a conventional VOD streaming service flow.

3 is a diagram illustrating a VOD streaming service system according to an embodiment of the present invention.

4 is a flowchart illustrating a VOD streaming service flow according to an embodiment of the present invention.

Claims (11)

In the VOD streaming system linked to the content server for supplying VOD streaming data at the request of the terminal through a wireless network, A report receiving unit which receives a report transmitted at regular intervals from the terminal using the VOD streaming service using the VOD streaming data provided from the content server; And A service transmission control unit for controlling the VOD streaming service transmission according to a determination result of whether the report reception unit receives the report; VOD streaming system comprising a. The method of claim 1, In a network protocol between a terminal connected through the wireless network and the VOD streaming system, a protocol for transmitting VOD streaming data from the content server to the terminal and a protocol for transmitting a report from the terminal to the report receiving unit are different. VOD streaming service system, characterized by using a network protocol. The method of claim 1, And requesting retransmission of the report to the terminal when the report receiving unit fails to receive the report within a predetermined time. The method of claim 3, The report receiving unit in the VOD streaming service system to perform the request for retransmission of the VOD streaming data until the transmission of the VOD streaming data from the content server to the terminal is completed. The method of claim 1, If the report receiving unit does not receive the report within a predetermined time due to the disconnection of the network between the terminal and the VOD streaming service system, the service transmission control unit stops transmitting the VOD streaming service to the terminal. The method of claim 1, The network protocol for transmitting a report from the terminal to the report receiving unit is Transmission Control Protocol (TCP) / Real Time Transport Control Protocol (RTCP), and the network protocol for transmitting VOD streaming data from the content server to the terminal is UDP. (User Datagram Protocol) / RTP (Real-time Protocol) VOD streaming service system. The method of claim 1, And a protocol determination unit for allowing a user to arbitrarily determine a network protocol between the VOD system and the terminal. A method for providing a VOD streaming service in a VOD streaming service system connected through a terminal and a wireless network, (a) providing VOD streaming data for a VOD streaming service transmission request from the terminal; (b) in step (a), receiving a report transmitted at regular intervals from the terminal according to the VOD streaming data provision; And (c) in step (b), if the report from the terminal is not received for a predetermined time, controlling the service transmission to the terminal, In a network protocol between a terminal connected through the wireless network and the VOD streaming system, a protocol for transmitting VOD streaming data from the content server to the terminal and a protocol for transmitting a report from the terminal to the report receiving unit are different. Using network protocols VOD streaming service method characterized in that. The method of claim 8, The network protocol from the VOD streaming system to the terminal is User Datagram Protocol (UDP) / Real-time Protocol (RTP), and the network protocol from the terminal to the VOD streaming system is Transmission Control Protocol (TCP) / RTCP (Real). Time transport control protocol) VOD streaming service method characterized in that. The method of claim 8, The control of the service transmission to the terminal in step (c) is repeated until the transmission of the VOD streaming data from the VOD streaming service system to the terminal is completed VOD streaming service method. The method of claim 8, In step (b), if the report does not arrive for a predetermined time, the terminal requests retransmission of the report, and if the arrival of the report according to the retransmission request is delayed for a predetermined time, disconnecting the connection with the terminal. VOD streaming service method, characterized in that.