分层迁移：分层多播拥塞控制中的快速响应方法

1 引言随着多播(multicast)技术的发展以及多播主干(Mbone)的普及,在Internet上出现了许多基于IP多播的音频/视频会话工具和多播流应用,然而这类应用却面临Internet的异构性和缺乏拥塞控制等主要问题。缺乏拥塞控制措施的多播应用无疑会影响行为规范的TCP流,还有导致网络瘫痪的可能。基于收方驱动的分层多播协议(RLM)最先提出分层多

Layer Transfer: A Rapid Response Method in Layered Multicast Congestion Control

There exists large Leave latency (often on the order of several seconds)in current Internet group management mechanism. This will cause layered multicast congestion control in slow response to network congestion. We give a new concept of layer transfer, which can implement rapid congestion response in layered multicast. Layer transfer will move congested layer data from one group to another, and the receivers will determine whether to re-subscribe the moved layer or not according to their current situations. Layer transfer has a key feature that it replaces slow Leave process by fast Join process, so it doesn't require any change to IGMP protocol,routers, or other multicast routing protocol. The simulation results show the new method can improve layered multicast sessions' fairness towards TCP sessions.