优化的多环应用层多播协议

An Optimized Application Layer Multicast Protocol Based on Multi-Rings

本文提出了一种新型的环状模型PBHV(Priority-Based Hierachical VRing),并对其性能进行仿真评估。此模型采用基于优先级的分层虚拟环技术,以环作为基本的拓扑结构,把节点分别组织在主环和从环上,同时在主、从原始环上建立虚拟环来减小网络半径。主环的建立采用区域划分机制,而在选择从环链接点时采用基于优先级的动态选择法。仿真结果表明:这种机制下,在链路伸展度、数据转发率和链路压力等方面有提高。

The paper presents PBHV （Priority-Based Hierachical VRing）protocol,a new scalable application multicast protocol that establishes a multi-rings topology which sets all the rings into two levels. And in order to reduce the delay between each member in the multicast group, the virtual ring technology is introduced in this paper which is used in every ring by means of the establishing of spare links. At the same time , the joint_nodes are selected through the principle of dynamic programming method based on priority.Simulation results show that the new model can improve the performance in Path Stretch, Data Delivery Ratio and Link Stress.