DCCP Based SVC Dynamic Streaming

• Main Authors: Mu En Chen, 陳沐恩
• Other Authors: Cheng-Shong Wu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/54119037866692741628

碩士 === 國立中正大學 === 通訊工程研究所 === 99 === Service of multimedia streaming is one of popular technology, which has been one of our daily life. It is a connectionless, unreliable, and best effort by using UDP transport layer protocol in Traditional multimedia. Generally speaking, UDP is more suitable than TCP. When network is congested, UDP takes a lot of bandwidth,which makes other service poor. Because UDP doesn’t know the condition of receivers, it can’t adjust its transmission rate. If the transmission rate is overloading, the event of packet loss may occur and reciever decode failed for video stream. Then the receivers’s video would be discontinuous, which is not welcome for user. It is hoped that DCCP(Datagram Congestion Control Protocol) replace UDP become transport layer protocol of multimedia service. DCCP, there is no retransmission property and congestion control. Therefore, it can mitigate congestion for network that DCCP adjust transmission rate with feedback when network is congested. In addition, the vedio would not appear the delay with DCCP because there is no retransmission mechanism in DCCP that is different with TCP. This paper use SVC(scalable video coding) to be our video format,which is a hierarchical structure and adapt different quality from one video .We use DCCP to be our transport layer protocol, and implement our Quality decision mechanism by feedback from receiver and characteristic of SVC. It is hoped that our mechanism can adjust level of SVC bitstream with variable condition of network to ensure basic quality of view when network is congested.