一种基于树树结构的低时延应用层组播模型  

Low Delay Application Layer Multicast Model Based on Tree-tree Structure

作　　者：廖小飞[1,2] 李德敏[1,2] 陈光[1,2] 陈雯[1,2] 陈建军[1] 盛佐 

机构地区：[1]东华大学信息科学与技术学院,上海201620 [2]东华大学数字化纺织服装技术教育部工程研究中心,上海201620

出　　处：《小型微型计算机系统》2016年第11期2493-2497,共5页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(71171045)资助;中央高校基本科研业务费专项基金项目(15D110422)资助

摘　　要：作为IP组播的替代,应用层组播具有简单灵活的优势,获得了广泛应用,但时延较大的缺点对性能影响较大.针对大规模应用层组播时延较大的问题,提出一种层次化的树树组播模型来降低应用层组播时延,该模型利用两层结构来组织和管理应用层组播组成员,并考虑节点性能和节点间时延来构建较低时延的组播树.当节点加入或退出组播组时,设计合适的组播树维护算法使得组播树的时延变化较小,满足低时延要求.计算机仿真表明该树树组播模型能够有效降低应用层组播的时延,改善大规模应用层组播性能,适合应用在大规模实时多媒体环境中.As an alternative of IP multicast, application layer multicast is widely used with the advantage of simplicity and flexibility, but the disadvantage of large transmission delay affects the performance. In this article,to reduce the transmission delay in large-scale application layer multicast, a hierarchical tree-tree model is proposed. This model organizes and manages multicast group members u- sing two-tier structure, and considers the nodes capability and the delay between nodes in building low delay multicast tree. When nodes join or leave the multicast group,muiticast tree maintenance algorithm is designed to keep small delay variation, and meet the low delay requirement. The computer simulations prove that this model reduces the application layer multicast transmission delay effectively,improves the application layer multicast performance, and therefore it is suitable to apply in large - scale real-time multimedia environment.

关 键 词：应用层组播 树树模型 低时延 实时多媒体 分层 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]