摘要
提出了一种接收端的速率自适应算法 ,称为RAAR .它可以应用于单播传输多媒体数据业务 .TCP由于它的遇到单个数据包丢失就减半的特点 ,造成速率剧烈抖动 ,不适合传输多媒体数据 .UDP由于没有拥塞机制也是不合适的 .RAAR在接收端对GAIMD进行了改进 ,使得它有良好的速率平滑性以及能够与竞争的TCP流公平地分享带宽 .RAAR算法比较简单 .我们的仿真显示 :RAAR的性能明显优于TFRC .由于RAAR没有每包确认机制 ,而且又是在接收端实现 。
This paper proposes a unicast mechanism for rate adaptation at receivers called RAAR. It can be used to transport multimedia data traffic. Neither TCP nor UDP can be used by multimedia traffic, because the TCP reduces the sending rate in half in response to a single packet drop and UDP has no congestion control mechanism. RAAR ameliorates GAIMD in receiver ends and has good smoothness of sending rate and fairness with competing TCP flows. RAAR is simple to implement. Simulations show that the performance of RAAR is better than those of TFRC obviously. RAAR is also a promising avenue of development for congestion control of multicast multimedia traffic, because it is not a per-packet acknowledgement mechanism and is implemented in receiver ends.
出处
《计算机学报》
EI
CSCD
北大核心
2003年第4期427-437,共11页
Chinese Journal of Computers
关键词
RAAR
多媒体流
INTERNET
自适应算法
拥塞控制
组播
Algorithms
Computer simulation
Congestion control (communication)
Multicasting
Multimedia systems
Network protocols
Signal receivers
Telecommunication traffic
