实时多媒体单播传输的拥塞控制研究

实时多媒体单播传输的拥塞控制研究 Research on Congestion Control of Real-Time Multimedia Unicast 叶刚 YE Gang 1 2 first-author 吴产乐 WU Chan-le 1 2 邱小燕 QIU Xiao-yan 1 2 熊卿 XIONG Qing 1 2 武汉大学计算机学院 武汉大学计算机学院 School of Computer,Wuhan University School of Computer,Wuhan University 武汉大学计算机学院,湖北,武汉,430072 武汉大学计算机学院,湖北,武汉,430072 简要分析了应用于实时多媒体传输的、以RAP为代表的仿TCP速率控制方案的不足,提出了一种TCP友好的、基于RTCP反馈的拥塞控制机制,该机制使发送速率的变化更为平滑,更适合于注重回放质量的实时多媒体应用.与RAP的比较实验显示,在瓶颈链路带宽、时延和包丢失率变化情况下,该机制具有比RAP更好的TCP友好性. This paper makes a brief analysis on the disadvantage of TCP-like rate control scheme for real-time multimedia service,and presents a RTCP-based congestion control mechanism which is stable and TCP-friendly.This mechanism makes the rate vary smoothly and it is fit for real-time multimedia applications.Lastly it makes a simulation through NS to evalue the performance of RAP and RCC,which lays a strong emphasis on the study of TCP-friendliness.The experimental results show that RCC mechanism,in most of scenarios:bottleneck link bandwidth varied,delay varied and loss ratio varied,is more TCP-friendly by contrast with RAP. 拥塞控制 速率适应协议 实时传输控制协议 TCP友好 congestion control RAP RTCP TCP-friendly TP393.04 湖北省科技攻关项目（20002P0127）;湖北省自然科学基金资助项目（2001B057） 2004-05-01 2021-04-01 5