  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.
