组播树维护策略的研究和实现  

Research and implementation of ALM tree maintenance policy

作　　者：张攀翔[1] 潘志辉[1] 常会友[1] 

机构地区：[1]中山大学信息科学与技术学院计算机科学系,广州510275

出　　处：《计算机工程与应用》2009年第1期115-117,共3页Computer Engineering and Applications

摘　　要：在IP组播模型、Overlay Network和Peer-to-Peer等技术的基础上发展而来的应用层组播技术正逐步成为一个流媒体直播的有效解决方案。树形组播方案构造简单,维护开销较小,可扩展性较好,比较适合于大规模的组播应用,但是其可靠性较差。通过比较研究其他P2P算法对节点稳定性和节点距离的衡量策略,对树形拓扑维护策略PeerCast进行改进,设计并实现了一个基于该改进算法的流媒体直播系统。应用表明,该算法能动态适应节点数达数百,节点生存周期较短的组播应用,较大程度上减小节点加入退出对QoS的影响。Application Level Multicast becomes an effective solution for live media streaming nowadays.Tree based ALM solution suitable for large-scale streaming is simple to construct and easy to maintain but weak in reliability.In this paper,with the study on peers stability and distance evaluation,a new tree-topology maintain policy is proposed based on peercast,a peer-peer streaming system is designed and implemented with this policy.Application shows that this algorithm works fine and can greatly deduce the influence on QoS when peers joining/leaving.

关 键 词：应用层组播 树形方案 组播树维护策略 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]