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在P2P系统中,由于大量自私节点的存在,导致系统中存在公共的悲剧和搭便车现象.如何使节点能够自发的共享自身所拥有的数据资源严重困扰着P2P系统.针对这一问题,提出一种基于博弈论的P2P视频点播激励机制.通过采用差分服务方式,引入贡献值这一概念来激励节点积极上传资源;并基于博弈论的知识对所提机制进行分析,证明所提机制存在纳什均衡并求解出该纳什均衡.模拟实验和相关数据分析表明,该策略能有效的激励节点上传视频数据,改进了P2P网络中的资源共享,从而最大化系统的效用.
In P2P system, due to the existence of a large number of selfish nodes, there are public tragedies and free-riding phenomenon in the system.How to make nodes spontaneously share the data resources owned by themselves is a serious problem to P2P system.Aiming at this problem, Based on game theory P2P video-on-demand incentive mechanism, the concept of contribution value is introduced to motivate nodes to actively upload resources by adopting the differentiated service approach. Based on the game theory, the proposed mechanism is analyzed to prove that the proposed mechanism has Nash equilibrium And the Nash equilibrium is solved.Modeling experiments and related data analysis show that this strategy can effectively stimulate nodes to upload video data and improve resource sharing in P2P networks so as to maximize the utility of the system.