Randomized algorithms
On the red-blue set cover problem
SODA '00 Proceedings of the eleventh annual ACM-SIAM symposium on Discrete algorithms
Computationally feasible VCG mechanisms
Proceedings of the 2nd ACM conference on Electronic commerce
Algorithms, games, and the internet
STOC '01 Proceedings of the thirty-third annual ACM symposium on Theory of computing
SODA '02 Proceedings of the thirteenth annual ACM-SIAM symposium on Discrete algorithms
Wearable Communities: Augmenting Social Networks with Wearable Computers
IEEE Pervasive Computing
Minimum Propositional Proof Length is NP-Hard to Linearly Approximate
MFCS '98 Proceedings of the 23rd International Symposium on Mathematical Foundations of Computer Science
The Price of Truth: Frugality in Truthful Mechanisms
STACS '03 Proceedings of the 20th Annual Symposium on Theoretical Aspects of Computer Science
Proceedings of the 9th annual international conference on Mobile computing and networking
SODA '04 Proceedings of the fifteenth annual ACM-SIAM symposium on Discrete algorithms
On the hardness of approximating label-cover
Information Processing Letters
An ad hoc mobility model founded on social network theory
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Proceedings of the 6th ACM conference on Electronic commerce
Proceedings of the 11th annual international conference on Mobile computing and networking
Beyond VCG: Frugality of Truthful Mechanisms
FOCS '05 Proceedings of the 46th Annual IEEE Symposium on Foundations of Computer Science
OURS: optimal unicast routing systems in non-cooperative wireless networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Computer Networks: The International Journal of Computer and Telecommunications Networking
On the cover time of random geometric graphs
ICALP'05 Proceedings of the 32nd international conference on Automata, Languages and Programming
Game theoretical aspects in modeling and analyzing the shipping industry
ICCL'11 Proceedings of the Second international conference on Computational logistics
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We study game-theoretic mechanisms for routing in ad-hoc networks. Game-theoretic mechanisms capture the non-cooperative and selfish behavior of nodes in a resource-constrained environment. There have been some recent proposals to use incentive-based mechanisms (in particular, VCG) for routing in wireless ad-hoc networks, and some frugality bounds are known when the connectivity graph is essentially complete. We show frugality bounds for random geometric graphs, a well-known model for ad-hoc wireless connectivity. Our main result demonstrates that VCG-based routing in ad-hoc networks exhibits small frugality ratio (i.e., overpayment) with high probability. In addition, we study a more realistic generalization where sets of agents can form communitiesto maximize total profit. We also analyze the performance of VCG under such a community model and show similar bounds. While some recent truthful protocols for the traditional (individual) agent model have improved upon the frugality of VCG by selecting paths to minimize not only the cost but the overpayment, we show that extending such protocols to the community model requires solving NP-complete problems which are provably hard to approximate.