【作者】 唐睿； 毛玉明；

【Author】 Tang Rui, Mao Yuming Institute of Communication and Infonnation, UEST of China, Chengdu 610054

【机构】 电子科技大学通信与信息工程学院；

【摘要】 DCCP是互联网中一种新型的传输层协议．适用于需要低时延同时又可以接受较小的数据丢失的应用．DCCP为不稳定数据流提供了拥塞控制,目前主要是两种算法:FCP-．1ike(类似于标准TCP的拥塞控制)和．D’RC(．Ⅱ口Friendly Rate Contr01)。我们的研究使用TFRC,它适合需要平稳传输速率的通信。比如流媒体应用。本文的目的在于分析DCCP相对于UDP在传输MPEG视频流时性能的改善。仿真结果显示:DCCP在MPEG数据数据帧可解码率,网络吞吐量和不同流之间友好性三个方面都有显著的性能提升。更多还原

【Abstract】 The Datagram Congestion Control Protocol (DCCP) is a new Internet transport protocol. It is meant to serve as an alternative protocol for applications that require low delays and where a certain degree of data loss is acceptable. It provides built-in congestion control for unreliable datagram flows, and now supports two kinds of congestion control mechanisms: TCP-like and TCP Friendly Rate Control (TFRC). TFRC is used in our research which is suitable for traffic with smooth changes in sending rates, such as streaming media. The purpose of this paper is to study the performance of transmitting MPEG (Moving Picture Experts Group) applications over DCCP/TFRC using Network Simulator 2 (NS2). We measure the perfonnance improvement by comparing the performance of MPEG streaming over DCCP and UDP. Our result shows that DCCP achieves some significant improvements in decodable frame rate, throughput and fairness.更多还原