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搭便车行为是指节点仅使用其它节点的资源而不作任何贡献,对P2P流媒体系统的服务质量会产生严重影响。基于两类流体模型对P2P流媒体系统的搭便车行为进行了建模研究,同时考虑了不存在种子节点和存在种子节点两类场景,并对稳态环境下搭便车行为对P2P流媒体系统性能的影响作了定量分析。结果发现,在存在种子节点场景下,诚实节点和搭便车节点的平均下载时间均远低于不存在种子节点场景,因此需要设计相应的激励机制以吸引种子节点留在系统中。而且,搭便车节点比诚实节点更容易从流媒体服务器和种子节点受益,因此需要在流媒体服务器和种子节点引入区分服务机制。
Hitchhiking refers to the node using only the resources of other nodes without any contribution to the P2P streaming media system will have a serious impact on the quality of service. Based on two types of fluid models, the free-riding behavior of P2P streaming media system is modeled. At the same time, there are two kinds of scenarios that there are no seed nodes and seed nodes, and the performance of free-riding behavior in P2P streaming media system The impact of a quantitative analysis. The results show that under the scenario of seed nodes, the average download time of honesty nodes and free-rider nodes is much lower than that of non-existence of seed nodes. Therefore, corresponding incentive mechanisms need to be designed to attract seed nodes to stay in the system. Moreover, free-rider nodes benefit more from streaming servers and seed nodes than honeful nodes, and therefore need to introduce a differentiation of service mechanisms between streaming servers and seed nodes.