KR20130063920A - Publisher/subscriber real-time streaming broadcast service - Google Patents

Abstract

PURPOSE: A publisher/subscriber mode real-time streaming broadcasting service is provided to simply connect communication based on desired data in a publisher/subscriber mode using DDS. CONSTITUTION: A DSTS(DDS Streaming Transport Service) module is mounted on a receiving terminal and a broadcasting station server. The broadcast station makes image multimedia, processes the image multimedia through the DSTS, and opens the image multimedia to a domain. A user connects the domain through the receiving terminal, searches the multimedia contents topic, and receives the multimedia contents from the desired corresponding topic.

Description

Published / Subscriber Real-Time Streaming Broadcast Service}

The present invention relates to an image providing technology, and more particularly, to a real-time image providing system and a real-time image providing method.

In the present invention, multimedia contents such as VOD, video conferencing, internet broadcasting, etc. are actively developed and serviced as multimedia technologies continue to develop, and the number of users is increasing rapidly. In order to transmit such multimedia contents in real time through a network, a streaming service technology is required.

 When the streaming service is used as the TCP which emphasizes the reliability of data transmission, it causes sudden change of bandwidth according to the network situation, high delay and jitter, and retransmission due to packet loss. It is a big problem in streaming services that exist in services.

Since UDP does not process any lost packets, instead of guaranteeing real-time with continuous playback, it does not have timing information and does not provide the ability to guarantee the quality of service (QoS) of real-time data. Can't transfer data. Since there is no mechanism to cope with congestion due to packet loss and packet delay due to dynamic network state change, a flow control technique considering this characteristic is necessary. In order to provide such a real-time service, the real-time data can be transmitted using the Real-Time Transport Protocol (RTP) and the network quality can be fed back to the sender periodically using the Real-Time Control Protocol (RTCP) to improve the transmission quality. TCP Friendly Rate Control (TFRC), Rate Adaptive Protocol (RAP), TCP Like (TLFC), which measures network conditions using jitter, transmission delay, and packet loss transmitted by RTP / RTCP. TCP friendly flow control techniques such as flow control are being studied and generally applied to server / client base.

Today, with the development of ubiquitous environment, as the number of mobile devices increases, tens of thousands of devices in the server / client environment frequently experience participation and withdrawal and real-time data exchange.

The present invention proposes a Publisher / Subscriber method to ensure the reliability of a streaming service using the UDP in accordance with the ubiquitous environment, and to enable equal N: N communication between mobile devices participating in a domain. The Publisher / Subscriber method provides an efficient image providing method by constructing a Data Distribution Service (DDS) communication middleware established as a standard in the Object Management Group (OMG).

As described above, according to the present invention, it is possible to simply connect communication to the center of the data desired by the Publisher / Subscriber method using DDS rather than the Server / Client method, and because it is possible to maintain a constant bandwidth and fast real-time data exchange. Legal to video streaming technology

1 is a diagram in which mobile device users receive video streaming from a relay server.
2 is a diagram of a streaming application mounted to a mobile device.

In the real name, the streaming server calculates the transmission rate that adapts to the network according to the QoS policy and configures the system structure to control the transmission rate of the streaming service.

Rate_Topic: All participants participating in the domain periodically transmit information on the transmission status to provide minimum control and media identification to provide flow control. Rate_Topic sends information such as the number of packets transmitted, the number of packets received, and the average round trip time of the sender and receiver through the Send Information (SI) and Receive Information (RI) data types. The sender uses this data to be used for QoS configuration requirements.

Status_Topic: Provides each QoS service that can adapt to network environment by analyzing information obtained from Rate_Topic.

VFR_Topic: VFR_Topic has the video related information. VFR_Topic adjusts and transmits the number of video frame packets to be transmitted according to the Status_Topic feedback.

   DSTS should be implemented to guarantee quality of service (QoS) to adjust video frame rate, quality level, and minimize the number of frame loss. QoS is guaranteed by giving priority to topic content update to DataWriter in Publisher with high real-time.

  In general, security surveillance or military surveillance cameras require reliability guarantees to minimize the loss of video frames, and movies and dramas allow the loss of packets of some frames because users require high-quality video. Ensure a fast frame rate.

301 produces and inputs an analog video image as a digital video image.
302 outputs the streaming video image to the GUI.
303 converts an analog video image into streaming data.
304 encodes the streaming data.
305 converts the decoded video image into streaming data.
306 decodes the video image received from the server.
307 adjusts the streaming video frame.
308 transmits an image frame that can be transmitted between mobile devices.
309 checks the video image state information provided by the server.

Claims (8)

The receiving terminal for receiving a high quality multimedia streaming service and a broadcasting station server for broadcasting multimedia content are equipped with a DSTS (DDS Streaming Transport Service) module. Broadcasting stations produce video multimedia, process it through DSTS, and release it to the domain. A user may access a domain, search for a multimedia content topic, and receive multimedia content through a corresponding topic. The DSTS module of claim 1, wherein the DSTS module is composed of encoding, buffer management, and DDS to design an architecture for processing multimedia content. The method of claim 1, wherein the encoding,
H.265 encoding is configured on the server and the terminal to decode the video frame. The method of claim 1,
The buffer management uses a TFRC (TCP Friendly Rate Control) flow control technique. The system of claim 1, wherein the DDS calculates a transmission rate that the streaming server adapts to the network according to the QoS policy, thereby configuring a system structure for adjusting the transmission rate of the streaming service. DataWriter creates Rate_Topic, VFR_Topic, Status_Topic. The method according to claim 6, wherein each participant provides each QoS service that can adapt to the network environment by analyzing the information obtained from Rate_Topic. The method of claim 6, wherein each participant analyzes the information obtained from Rate_Topic and provides each QoS service that can adapt to the network environment for each participant. The VFR_Topic has information related to a moving picture. VFR_Topic adjusts and transmits the number of video frame packets to be transmitted according to the Status_Topic feedback.

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