Uniform Mixed Equilibria in Network Congestion Games with Link Failures

Authors Vittorio Bilò, Luca Moscardelli, Cosimo Vinci

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Author Details

Vittorio Bilò
  • Department of Mathematics and Physics, University of Salento, Lecce, Italy
Luca Moscardelli
  • Department of Economic Studies, University of Chieti-Pescara, Pescara, Italy
Cosimo Vinci
  • Department of Information Engineering Computer Science and Mathematics, University of L'Aquila, L'Aquila, Italy - Gran Sasso Science Institute, L'Aquila, Italy

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Vittorio Bilò, Luca Moscardelli, and Cosimo Vinci. Uniform Mixed Equilibria in Network Congestion Games with Link Failures. In 45th International Colloquium on Automata, Languages, and Programming (ICALP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 107, pp. 146:1-146:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)


Motivated by possible applications in fault-tolerant routing, we introduce the notion of uniform mixed equilibria in network congestion games with adversarial link failures, where players need to route traffic from a source to a destination node. Given an integer rho >= 1, a rho-uniform mixed strategy is a mixed strategy in which a player plays exactly rho edge disjoint paths with uniform probabilities, so that a rho-uniform mixed equilibrium is a tuple of rho-uniform mixed strategies, one for each player, in which no player can lower her cost by deviating to another rho-uniform mixed strategy. For games with weighted players and affine latency functions, we show existence of rho-uniform mixed equilibria and provide a tight characterization of their price of anarchy. For games with unweighted players, instead, we extend the existential guarantee to any class of latency functions and, restricted to games with affine latencies, we derive a tight characterization of both the prices of anarchy and stability.

Subject Classification

ACM Subject Classification
  • Theory of computation → Algorithmic game theory
  • Theory of computation → Quality of equilibria
  • Theory of computation → Network games
  • Network Congestion Games
  • Fault-Tolerant Routing
  • Nash Equilibria
  • Price of Anarchy
  • Price of Stability


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