TA-chord2:基于分层DHT的拓扑感知流媒体体系  

TA-chord2:A topo -aware streaming media architecture based on two-layer DHT

作　　者：肖黎黎[1] 覃少华[1] 吴明生[1] 吴绮[1] 孙桂刚[1] 

机构地区：[1]广西师范大学计算机科学与信息工程学院,广西桂林541004

出　　处：《计算机工程与应用》2009年第5期120-124,共5页Computer Engineering and Applications

基　　金：广西教育厅项目(No.桂教科研[2005]47号)

摘　　要：针对目前DHT系统较高的维护开销、应用层网络与物理网络的拓扑失配等不足,提出一种基于分层DHT的拓扑感知流媒体体系TA-chord2。分层的设计使节点根据其服务能力对系统做出相应的贡献;PNS原则和Vivaldi坐标减少了节点的查询延迟和媒体数据的传播延迟;多个邻近的供应者同时给一个请求者提供流服务,提高了流媒体系统的传输效率和服务质量。实验仿真结果表明该体系有更低的维护开销、更好的路由性能和更高的服务效率。In DHT system,the maintenance overhead is relatively high and topo is not aware.To solve these problems,this paper introduces TA-chord2：A topo-aware streaming media architecture based on two-layer DHT,which makes nodes to contribute their resources differently to the system based on their service capacity;PNS and Vivaldi are introduced to decrease routing latency and streaming media transmitting lantency;replying queries with multiple peers which are close to the requesting peer,could achieve good streaming qualitt.Experiment resuhs show that TA-chord2 has lower maintence overhead,better routing performance and streaming quality than chord.

关 键 词：TA-chord2 chord 邻近邻居选择(PNS) VIVALDI 拓扑感知 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]