2 research outputs found
Cognitive Radio Simultaneous Spectrum Access/ One-shot Game Modelling
The aim of this work is to asses simultaneous spectrum access situations that
may occur in Cognitive Radio (CR) environments. The approach is that of one
shot, noncooperative games describing CR interactions. Open spectrum access
scenarios are modelled based on continuous and discrete reformulations of the
Cournot game theoretical model. CR interaction situations are described by Nash
and Pareto equilibria. Also, the heterogeneity of players is captured by the
new concept of joint Nash-Pareto equilibrium, allowing CRs to be biased toward
different types of equilibrium. Numerical simulations reveal equilibrium
situations that may be reached in simultaneous access scenarios of two and
three users.Comment: 6 double-column pages, 8 figures, CSNDSP 2012. arXiv admin note:
substantial text overlap with arXiv:1207.3365, arXiv:1209.5387,
arXiv:1209.501
Beyond Nash Equilibrium in Open Spectrum Sharing: Lorenz Equilibrium in Discrete Games
A new game theoretical solution concept for open spectrum sharing in
cognitive radio (CR) environments is presented, the Lorenz equilibrium (LE).
Both Nash and Pareto solution concepts have limitations when applied to real
world problems. Nash equilibrium (NE) rarely ensures maximal payoff and it is
frequently Pareto inefficient. The Pareto set is usually a large set of
solutions, often too hard to process. The Lorenz equilibrium is a subset of
Pareto efficient solutions that are equitable for all players and ensures a
higher payoff than the Nash equilibrium. LE induces a selection criterion of
NE, when several are present in a game (e.g. many-player discrete games) and
when fairness is an issue. Besides being an effective NE selection criterion,
the LE is an interesting game theoretical situation per se, useful for CR
interaction analysis.Comment: 5 pages, 4 figure