基于混合组播的视频会议应用框架的研究  

ON VIDEO CONFERENCE APPLICATION FRAMEWORKS BASED ON HYBRID-MULTICAST

作　　者：来杨[1] 刘厚泉[1] 

机构地区：[1]中国矿业大学计算机科学与技术学院,江苏徐州221008

出　　处：《计算机应用与软件》2009年第4期55-58,共4页Computer Applications and Software

基　　金：江苏省自然科学基金项目(BK2006039)

摘　　要：基于混合组播技术的一个代表模型——Host Multicast Fram ework,根据网络视频会议系统的应用要求进行一些改进:为了减少数据转发的层次,缩短延迟,在原有的双向组播共享树的基础上将服务器节点以双层的应用层组播方式组织逻辑网络结构,提出一个基于双层应用层组播结构的视频会议应用框架DAHMI。同时考虑到服务器可能会由于过载而引起系统崩溃问题提出了一个动态负载分配思想。最后通过仿真试验证明新系统在缩短延迟上优于HM(Host-Multicast)。According to the application requirement of website video conferencing system, in this article we made some changes on the Host Multicast Framework which is a representative model of the hybrid-multicast technology, and then proposed a video conference applica- tion framework based on application layer multicast of double hierarchies architecture DAHMI. In order to reduce the hierarchies of data forwarding and shorten the delay, which is based on original bidirectional multicast shared tree to organize the server nodes to logic network structure in the way of application layer multicast of double hierarchies. In the article we also proposed a dynamic load allocation idea consid- ering the collapse problem the system might encounter caused by server＇s overload. In the end of the article the DAHMI is proved superior to HM in shortening the delay through simulation experiment.

关 键 词：混合组播 视频会议 HM模型 应用层组播 双层结构 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术] TN948.63[自动化与计算机技术—计算机科学与技术]