BowCast：一种适应非对称链路延时网络的P2P多播路由协议

虽然IP多播的性能优势无可否认,但是它却面临着部署上的困难。近年来,P2P多播作为提供多播服务的另一可行途径正不断为人们所认可。研究非对称链路延时网络环境下P2P多播的路由问题,提出一个新的P2P多播路由协议：BowCast.该协议采用基于树（tree-based）的分布式路由策略,使多播组成员之间能自组织地构建一棵基于源的最小延时P2P多播树。BowCast主要利用范围受限的单向探测技术（BOW）来实现路由优化算法。BOW能提供端系统节点间的单向相对延时,无需全局的同步时钟。仿真实验表明,BowCast能很好地适应非对称链路延时环境。通过调节BOW的探测范围,BowCast能灵活地在路由性能和控制开销之间进行折中。

BowCast：A P2P Multicast Routing Protocol for Asymmetric Link Delay Networks

Though the performance advantages of IP muhicast is undeniable, the deployment of IP multicast has met many difficulties. In recent years, P2P muhicast is being increasingly recognized as a viable alternative. In this paper,the routing problem of P2P muhicast in asymmetric link delay networks is studied, and a new P2P muhicast protocol called BowCast is proposed. Adopting tree-based and distributed strategies,the protocol enables members of a multicast group to self-organize into a sourced-based P2P multicast tree with minimum delay. The BowCast uses a technology called Bounded One-Way probe （BOW） to implement the routing optimum algorithms. BOW can provide the relative one-way delay among end systems without requiring global time synchronization. The simulation results show that BowCast can adapt the asymmetric link delay environment very well, and by tuning the scope of probing in BOW, BowCast can make trade-off between routing performance and control overhead flexibly.