| Summary: | 碩士 === 國立中正大學 === 通訊工程研究所 === 100 === As mobile devices become increasingly common. In recent years, the development of wireless networks technology also growing fast. Slowly began to appear this real-time needs like IPTV or video conferencing, multimedia applications and use one-to-one unicast and one-to-many multicast applications. Recently SVC (Scalable Video Coding) has been standardize. It encode video to hierarchical structure. Video Receiver can receive high degree of importance of the video without all video data according to the network bandwidth condition. On the other hand of video streaming, DCCP transport protocol have been proposed. It use TFRC mechanism estimate end-to-end network available bandwidth. It transmission rate variation is more gently, so it’s very suitable in video streaming. However, DCCP is designed for wire network, and DCCP is connection-oriented transport protocol so it can’t support multicast transmission. We discover that DCCP for multimedia streaming has some problems in wireless network. The problem is that the bandwidth will be underestimated by DCCP and takes more overhead to maintain the operation of the wireless environment because of using small frame.
To solve this problem, this paper use SVC as our video encoding, and improve DCCP transmission performance on wireless networks. And we get bandwidth information from DCCP and decide sending video level, and propose virtual multicast transmission by DCCP so that can support on-to-many transmission on wireless networks.
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