新型的环状层次应用层多播模型

Hierarchy Virtual Ring-based Application-layer Multicast Model

提出了一种新型的环状层次应用层多播模型HVRB(Hierarchy Virtual Ring-based),它适合于拥有大规模多播成员的多播组。该模型以环作为拓扑结构,同时引入了虚环[1]的概念。采用了基于动态优先级的层次划分方法使得该环状拓扑结构随时间的变化性能逐步得到提高,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。由仿真试验结果可知该模型具有较高的数据传输率、较高的带宽利用率和较低的控制开销。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 HVRB （Hierarchy Virtual Ringbased） protocol, a new scalable application-layer multicast protocol that establishes rings as its topology among group members,which can be used for large group members. Data transmission topology can be easily implemented on top of the ring, and meanwhile virtual ring concept is involved in this paper. Dynamic layer 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. Fastspeed recovery can be got when data transmission error occurs. Results demonstrate that HVRB has higher data delivery ratio, higher bandwidth usage and lower control overhead in proportion with NICE. Using p2p network simulator and results show that the new model can improve the performance of multicast fairly well.