一种分层的环状应用层多播模型

A Virtual Ring-Based Hierarchy Application-Layer Multicast Model

提出了一种新型的适合于大规模应用层多播的模型VRBH(Virtual Ring-Based Hierarchy),它以环作为拓扑结构,同时引入了分层和虚拟环的概念。采用了基于优先级的动态规划方法使得该环状拓扑结构随时间的变化逐渐趋于合理,并且采取一定的措施使得当出现数据传输错误时可以进行快速的恢复。由仿真试验结果得知该模型具有较低的控制开销,较高的带宽利用率和较高的数据传输率,应用该多播模型可以较好地提高多播的性能。

This paper presents the analysis, design and performance evaluation of VRBH （Virtual Ring-Based Hierarchy） protocol, a new application-layer muhicast protocol that establishes rings as its topology among group members, and meanwhile hierarchy and virtual ring concepts are involved in this paper. Dynamic programming method based on priority is used in the paper, and the ring topology is becoming more and more reasonable with the change of time. Fast-speed recovery can be got when data transmission error occurs. Results demonstrate that VRBH has lower control overhead, higher bandwidth usage and higher data delivery ratio in proportion with NICE. Using p2p network simulator and results show that the new model can improve the performance of multicast fairly well.