A Fair Utility Function for Incentive Mechanism against Free-Riding in Peer-to-Peer Networks

Authors:
Yuhua Liu;Chun Yang;Kaihua Xu;Hongcai Chen
Affiliations:
Department of Computer Science, Huazhong Normal University, Wuhan, China 430079;Department of Computer Science, Huazhong Normal University, Wuhan, China 430079;Research Center of the Digital Space Technology, Huazhong Normal University, Wuhan, China 430079;Department of Computer Science, Huazhong Normal University, Wuhan, China 430079
Venue:
NEW2AN '08 / ruSMART '08 Proceedings of the 8th international conference, NEW2AN and 1st Russian Conference on Smart Spaces, ruSMART on Next Generation Teletraffic and Wired/Wireless Advanced Networking
Year:
2008

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Abstract

There are two problems, unfair and too strict, with the utility function of the proposed incentive mechanisms for restraining the free-riding in peer-to-peer (P2P) networks. This paper is devoted to establish a new fair utility function to solve those problems. We absorb both the absolute contribution value and the physical performance of peers in our utility function and the absolute contribution value is divided into supply value and profit value. Besides, we take the time the user is in the system as a factor of a peer's utility. The mathematical modeling, Analytic Hierarchy Process (AHP), is used in this paper to construct the function. The simulations compare the fair utility function with the proposed three functions and the results verify that this function is effective to solve those two problems.