| We tackle various problems related to efficiency of cognitive radio networking including enforcing truthfulness as a dominant strategy in dynamic spectrum sharing through suitable choice of channel allocation and pricing schemes, framework for sustainability of a coalition among cognitive radios within secondary networks through fair and anti-collusion cost-sharing mechanisms, and determining primary radio's optimal decision instances in sharing the idle band with secondary cognitive radios within channel variation constraints.;Furthermore, to maintain cooperative spectrum sensing security, we apply incentive alleviation to address channel eviction triggering attack in cognitive radio networks, in which adversary secondary cognitive radio nodes try to interrupt secondary access to the otherwise idle licensed bands and distort the spectrum sensing decision of the cognitive radio network through sensing misreports. We propose preventive solutions to avoid denial of service in a cognitive radio network.;In addition, power saving patterns in a shared spectrum sensing task among a group of cognitive radio nodes are proposed that contribute to prolonging the network lifetime. Numerical results in each case verify the effectiveness of the proposed methods. |
