一种支持大规模应用层组播的混合拓扑覆盖网络  

A HybridTopology Overlay Network for Supporting LargeScale ApplicationLevel Multicast

作　　者：姜山[1,2] 郑庆华[1,2] 刘晓[1,2] 董巍[1,2] 

机构地区：[1]西安交通大学计算机科学与技术系,西安710049 [2]西安交通大学智能网络与网络安全教育部重点实验室,西安710049

出　　处：《西安交通大学学报》2010年第2期11-14,30,共5页Journal of Xi'an Jiaotong University

基　　金：国家杰出青年基金资助项目(60825202);国家自然科学基金资助项目(60633020;60803079);国家科技支撑计划资助项目(2006BAJ07B06);国家高技术研究发展计划资助项目(2008AA01Z131);新世纪优秀人才支持计划资助项目(NECT-08-0433)

摘　　要：提出一种支持大规模应用层组播的混合拓扑覆盖网络——H-ALM.将传输覆盖网络分为主干层和分支层,主干层采用树状结构,分支层采用网状结构.H-ALM克服了单一树状结构传输稳定性差和单一网状结构传输延迟大的不足,同时综合考虑节点规模、节点的带宽能力、节点累计转发和接收数据量等实时的状态和网络条件,从而进一步优化了混合式传输覆盖网络.实验表明,H-ALM比树状方法更稳定,比网状方法延迟更小.A hybrid-topology overlay network for large-scale application-level multicast-H-ALW is proposed. The overlay network is divided into two tiers by H-ALM. One is the backbone layer that has a tree-based topology; and the other is the branch layer that has a mesh-based topology. It is known that the stability of the pure tree-based topology is not good enough for distributing streaming data; and stream delivery over the pure mesh-based topology suffers from high delay yet. The H-ALM overcomes these shortcomings by combining the merits of the tree-based topology and the mesh-based topology, and optimizes the two-tier hybrid overlay network by considering the real-time status and network conditions such as the scale of the overlay, bandwidth capacity of nodes, the cumulative data traffic that each node relayed and received and so on. Therefore, the performance of stability and communication delay of distributing streaming data are improved. Experimental results show that the H-ALM achieves better stability than the tree-based overlay and lower transmission delay than the mesh-based overlay.

关 键 词：应用层组播 混合拓扑 覆盖网络 稳定性 传输延迟 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]