一种对等网络层次比率优化模型  

An Optimization Model for Layer Division in Hierarchical Peer-to-Peer Network

作　　者：李君[1,2] 张顺颐[1] 黄长佳[1] 王浩云[1] 

机构地区：[1]南京邮电大学信息网络技术研究所,江苏南京210003 [2]浙江万里学院通信工程系,浙江宁波315100

出　　处：《南京邮电大学学报（自然科学版）》2009年第4期41-45,共5页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)(2006AA01Z232;2009AA01Z212;200901Z202);浙江省自然科学基金(Y1080935)资助项目

摘　　要：层次比率是影响层次P2P系统查找性能的主要因素,利用节点能力的差异性,建立了基于DHT的两层P2P网络结构的查询时延模型和节点负荷模型,并根据模型求出最优层次比率。仿真结果证明了提出的求解方案能有效地提高两层P2P网络的查找性能,使系统具有更好的可扩展性,有利于P2P网络应用,尤其是基于P2P的VoIP应用的大规模部署。Layer size ratio is the key factor affecting search performance of hierarchical P2P architecture. By means of node heterogeneity, this paper presents lookup delay model and workload model to characterize the two-layer P2P architecture using DHT at the top level. Based on the proposed models, optimal layer size ratio can be determined. Simulation results demonstrate that the proposed solution to size ratio determination can significantly improve the quality of two-layer P2P system in terms of lookup hops and over- heads. System scalability is therefore ensured ,which is critical to the deployment of large-scale P2P application,especially for P2P based VoIP system.

关 键 词：对等网络 层次比率 查询时延模型 负荷模型 

分 类 号：TN915.07[电子电信—通信与信息系统]