A Distributed Trust Model Based on Reputation Management of Peers for P2P VoD Services
Guimin Huang · KSII Transactions on Internet and Information Systems · 2012
Peer-to-Peer (P2P) networks are becoming more and more popular in video content delivery services, such as Video on Demand (VoD).Scalability feature of P2P allows a higher number of simultaneous users at a given server load and bandwidth to use stream service.However, the quality of service (QoS) in these networks is difficult to be guaranteed because of the free-riding problem that nodes download the recourses while never uploading recourses, which degrades the performance of P2P VoD networks.In this paper, a distributed trust model is designed to reduce node's free-riding phenomenon in P2P VoD networks.In this model, the P2P network is abstracted to be a super node hierarchical structure to monitor the reputation of nodes.In order to calculate the reputation of nodes, the Hidden Markov Model (HMM) is introduced in this paper.Besides, a distinction algorithm is proposed to distinguish the free-riders and malicious nodes.The free-riders are the nodes which have a low frequency to free-ride.And the malicious nodes have a high frequency to free-ride.The distinction algorithm takes different measures to response to the request of these two kinds of free-riders.The simulation results demonstrate that this proposed trust model can improve QoS effectively in P2P VoD networks.