Resource sharing in WiFi infrastructure networks: a Game Theoretic approach

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• Laura Giarré, University of Palermo
• Friday 12 November 2010, 16:00-17:00
• CAP Seminar Room .

If you have a question about this talk, please contact Paola Falugi.

In WiFi networks, mobile nodes compete for accessing a shared channel by means of a random access protocol called Distributed Coordination Function (DCF). Although this protocol is in principle fair, since all the stations have the same probability to transmit on the channel, it has been shown that unfair behaviors may emerge in actual networking scenarios. These phenomena are due to different reasons, including non-standard configurations of the nodes, short-term performance observations, and critical network topologies. Assuming that a contending node can dynamically change its strategy by tuning its contention parameters to non-standard values on the basis of channel observations, we prove that, for infrastructure networks selfish access strategies are able to reach equilibrium conditions, which are in many cases also Pareto optimal. A DCF extension for a MAC design is proposed, based on simple network status estimators, which uses the role of the AP to enforce the nodes to operate on the Pareto optimal equilibrium and to achieve global optimality and fair performance. Here, we propose a mechanism design based on a ACK suppression scheme.

Speaker: Laura Giarré is Associate Professor at University of Palermo since 1998. She held a Lecturer position at Politecnico of Turin from 1993 to 1998. In 1992 she graduated in System Engineering from the University of Bologna and in 1986 she got the Laurea Degree in electronic engineer from the University of Florence. Her actual research topics are mainly in networked systems, according to a game theoretical approach with applications to WiFi networks, sensor networks and inventory networks. She has been working also in identification of LPV and block oriented system according to the worst-case paradigm with applications also to system biology.

This talk is part of the Control and Power Seminars series.

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