在分析了P2P分层体系结构的基础上,结合P2P文件共享系统应用提出了重叠网络层和应用层的QoS评价模型,并进一步形成了整体QoS评价模型。仿真实验分析了节点的加入和退出、节点的能力和上传策略、节点缓存大小和节点缓存策略等因素对QoS的影响。另外,文件的热度也是影响系统QoS的一个重要因素。
Based on the analysis of P2P hierarchical architecture, QoS evaluation model for overlay network layer and application layer were proposed combined with P2P file-sharing system applications, and the overall QoS evaluation model was further formed. The simulation analyzed how the factors impact on the QoS, including the joining and leaving of nodes, node capabilities and uploading strategy, node, cache size, and node caching strategies and other. In addition, the heat of the file was also an important factor to influence system QoS.