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Issue No. 07 - July (2011 vol. 60)
ISSN: 0018-9340
pp: 1045-1056
Tingting Chen , State University of New York at Buffalo
Fan Wu , University of Illinois at Urbana-Champaign
Sheng Zhong , State University of New York at Buffalo
A wireless ad hoc network does not have an infrastructure, and thus, needs the cooperation of nodes in forwarding other nodes' packets. Reputation system is an effective approach to give nodes incentives to cooperate in packet forwarding. However, existing reputation systems either lack rigorous analysis, or have analysis in unrealistic models. In this paper, we propose FITS, the first reputation system that has rigorous analysis and guaranteed incentive compatibility in a practical model. FITS has two schemes: the first scheme is very simple, but needs a Perceived Probability Assumption (PPA); the second scheme uses more sophisticated techniques to remove the need for PPA. We show that both of these two FITS schemes have a subgame perfect Nash equilibrium in which the packet forwarding probability of every node is one. Experimental results verify that FITS provides strong incentives for nodes to cooperate.
Keywords ad hoc networks, incentive compatibility, routing, packet forwarding.

T. Chen, F. Wu and S. Zhong, "FITS: A Finite-Time Reputation System for Cooperation in Wireless Ad Hoc Networks," in IEEE Transactions on Computers, vol. 60, no. , pp. 1045-1056, 2010.
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