启发式动态组多媒体通信目的节点加入算法的研究

Research on Heuristic Destination Node Joining Algorithms for Dynamic Group Multimedia Communication

1 引言 很多分布式多媒体应用都属于组应用[1～3],例如远程教学、远程医疗诊断、计算机会议.根据是否允许成员动态加入/退出组,分布式多媒体组应用可以分成动态组和静态组两类.支持动态组应用的基于QoS的路由选择机制[4～8]依然是分布式多媒体系统中有待进一步深入研究的问题.对于动态组应用,可以认为最初只有两个成员,随着应用的进行,成员可以动态加入与退出,因而路由选择机制需要支持以下三个问题的解决:初始路由建立、成员动态加入、成员动态退出.

The routing mechanisms,which can support distributed multimedia dynamic group applications, are very important. QoS based destination node joining algorithms are key components of dynamic group multimedia communication routing mechanisms. In this paper,with the support of the QoS-based initial route setup algorithms,two QoS-based algorithms,which can support the member to join in the group dynamically, are presented. Combined with the QoS based initial route setup algorithms and desination node leaving algorthms ,the QoS guarantees for distributed multimedia dynamic group applications could be supported.