P2P环境下影像数据流传输的资源定位及选择研究  

Resource Locating and Selection for Spatial Image Streaming on P2P Network

作　　者：刘异[1] 龚健雅[2] 呙维[2] 

机构地区：[1]武汉大学测绘学院,湖北武汉430074 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430074

出　　处：《测绘学报》2010年第4期383-389,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家973计划(2006CB701305);国家863计划(2009AA12Z229)

摘　　要：在传统P2P资源定位方法的基础上,对空间P2P系统采用一种网格索引peer分组来实现资源定位,并探讨peer选择策略来优化资源定位结果,采用历史速度记录反馈推测peer选择优先级使得性能高和可靠的peer可以优先被选择。大量模拟实验测试peer选择策略局部最优和不等概率随机选择两种模式,结果显示peer选择策略的有效性以及有效性程度取决于peer个数、资源文件大小和用户行为等应用场景。The authors explore non-linear content access mode of spatial data on virtual earth,and then adopt grid-based peer group for resource locating on top of traditional P2P locating method.Further,peer selection mechanisms to optimize the results of resource locating are discussed.Historical download speed records are combined to estimate the preference of peer so that high capacity and reliable peer can be chosen firstly.Two modes of our peer selection mechanism that are local optimal and non-equal probability have been tested through many simulative experiments.Results show the better effects with our peer selection mechanism comparing to random peer selection,and also tell that effectiveness of peer selection mechanism is related to application scenario such as peer number,file size and user behaviors.

关 键 词：P2P 影像 流传输 peer选择 资源定位 

分 类 号：P228[天文地球—大地测量学与测量工程]