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在Peer-to-Peer网络中,Free-riding行为严重影响了P2P网络的可供使用的资源总量,降低了P2P网络的整体服务能力.针对这一问题,提出一种基于信任的激励机制TIM,适用于非结构化P2P网络.从多个方面统计了节点转发查询的能力,从而确定节点的查询被转发的范围;通过比较请求节点和服务节点的信誉来决定请求节点获取服务的概率;在选择响应节点时,优先选择信誉度高的服务节点.给出了信息的放置方法及查询转发、服务提供、响应处理三方面的算法.仿真实验和分析表明,激励机制TIM可以有效识别搭便车节点和恶意节点,并促进了节点之间的合作,提高了P2P网络的整体可用性.
In Peer-to-Peer network, the Free-riding behavior seriously affects the total available resources of P2P network and reduces the overall service capability of P2P network.In response to this problem, this paper proposes a trust-based incentive mechanism TIM , Which is suitable for unstructured P2P network.Studying the ability of nodes to forward queries from many aspects to determine the scope of the query being forwarded by nodes.Determining the probability of requesting nodes to obtain services by comparing the reputation of requesting nodes and serving nodes. When selecting response nodes, priority is given to the service nodes with high creditworthiness, and the information placement methods and the algorithms of query forwarding, service provision and response processing are given.The simulation and analysis show that the incentive mechanism TIM can effectively identify free-riding nodes And malicious nodes, and promote the cooperation between nodes and improve the overall availability of P2P networks.