For Mpeg-4 Fgs Stream Switch Scheduling Algorithm

In recent years, in general with the development and applications of Internet technology, the network is increasingly affecting the way of people's life and production. As the video information with strong visual, rich in content, and other characteristics, the video transmission becomes more and more important in the network transmission area. Video streaming (also known as streaming media) is one of the rapid development of technologies.However, streaming media transmission of video on the Internet experiences a new challenge about video compression, network transmission. First of all, for different streaming media applications, it is required that the compression and streaming with scheduling has scalability in the quality of service, because of various requests about media quality, delay, interactivity and so on; Secondly, the network has heterogeneity (Heterogeneity) and the network quality of service (QoS) has Best-effort Service,so streaming media transmission which needs for Internet transmission may encounter a variety of issues, such as providing congestion control, adaptive bandwidth and some fault tolerance, and so on; Thirdly, the ability of the decoding users device and a variety of playing ways require the structure of streaming media transmission is convenient to decode and play on the user equipment. At present, the transmission network is a major bottleneck in three-switch, how to improve the scheduling strategy is an effective way to improve the quality of service.In this paper, self-similiry of the ON/OFF Traffic Model fit on the actual network is developed, in addition, the switch scheduling algorithms combined with MPEG-4 scalable coding technology is given based on an existing switch scheduling algorithm approach which is on the basis of the switch scheduling algorithm, the MPEG-4 stream transmission characteristics and network's request.First of all, the streaming media using the Progressive Fine Granular Scalable (PFGS) encode convert into a basic layer and four-enhance layer. In order to distinguish at all levels, the basic layer, four-enhancer and the general data precede priority tagging, classification.And then the input queue structure based on the VOQ , output data arrived at each port were put 6 different queues in accordance with the priorities. It is divided into three groups: the basic level group, four sub-enhance level group and general packet data. Dynamic Priority iSLIP scheduling algorithm on the inter-group and the scheduling rotation method in the inner-group is adopted. Finally, It is simulated that the all of algorithm on the self-similary ON/OFF Traffic Model and the 8×8 of the structure of the exchange, the results show that the adopted algorithm can guarantee priority through of the basic MPEG-4 layer, more MPEG-4 Enhance layer through according to the state of network bandwidth to better support the MPEG-4 stream transmission.