HSRM:一个适合组播会议控制的可靠组播通信模型

研究了组播会议控制对网络通信的要求．针对这一背景，提出了一个新的基于接收方丢失报文概率分组的可扩展可靠组播通信模型HSRM，设计了其分层结构的动态构建和维护策略，并进行了数值仿真．HSRM使用全分布方式和一致的组播通信构造与发送者无关的分层结构，限制了反馈和修复报文的扩散范围并控制了组内节点的异构性和组播组的规模．在保持良好鲁棒性、可扩展性和灵活性的前提下，提高了多对多可靠组播的性能．

HSRM: A Reliable Multicast Model for Conferencing Control

In this paper, we present a new RM protocol named as HSRM (Hierarchical Scalable Reliable Multicast) for conferencing control. We group hosts into subgroups according to their packet loss figures, as a result, the heterogeneity of hosts is reduced in each subgroup, and the number of retransmission time is decreased efficiently at the same time. Furthermore, since feedback and recovery packets are restricted to subgroups, they will never spread to the whole multicast group. This is very advantageous to conferencing control, which always contains thousands of hosts distributed in a large scope. We then present a mechanism to construct and maintain its adaptive hierarchical structure dynamically. The result of numerical simulations demonstrates that the proposed HSRM is efficient than SRM in scalability.