%0 Conference Proceedings %A Denker, G. and Elenius, D. and Senanayake, R. and Stehr, M.O. and Wilkins, D. %T A Policy Engine For Spectrum Sharing %B New Frontiers in Dynamic Spectrum Access Networks %C Dublin, Ireland %@ 1-4244-0663-3 %I IEEE %S 2nd IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN) %P 55-65 %D 2007 %K policies, cognitive radios, spectrum sharing %X We argue for a policy-based approach to increase spectrum availability. We summarize a new language for expressing policies that allow opportunistic spectrum access. A Policy Reasoner that reasons about these policies can be used with cognitive radios to guarantee policy-specified behaviors while allowing spectrum sharing. We evaluated the reasoner in a demonstration. We describe the policies used in that demonstration and the results of the evaluation.