Research Of Incentive Mechanism On Collaborative Spectrum Sensing In Cognitive Radio Network

With the growing of wireless services,the demand for radio spectrum has significantly increased.Opposed to the increased demand,the spectrum is scarce.Cognitive radio technology is expected to solve this critical contradiction.Cognitive radio technology is a new technology that can realize spectrum sharing.Through detecting the electromagnetic environment around,cognitive radio can find the free band,get free band information,then choose a suitable frequency to share.Spectrum sensing is the core function for cognitive radio.Moreover,collaborative spectrum sensing has been proved that can drastically improve the sensing performance in cognitive radio networks(CRN).However,there is a problem.Usually, the cognitive users belong to different service providers,they may not participate in cooperation as many previous works assumed if the cooperation can’t bring them benifits. So, it is necessary to build incentive mechanism to ensure that the cooperative sensing can be carried out.Indirect reciprocity model is a new game theory model, the core idea is "I helped you, not because you helped me, but because you helped others". Indirect reciprocity model guides the behavior of participants in the system by setting good social norms. These characteristics of the indirect reciprocity model make it suitable to be used in the field of collaborative spectrum sensing.So,in this paper, a novel incentive mechanism framework based on indirect reciprocity has been studied.The study in detail include:(1) an incentive mechanism based on indirect reciprocity to simulate the cognitive users in centralized collaborative spectrum sensing was proposed,then,the theory optimal strategy and its precondition were derived. Finally, some simulation were carried out to investigate the effect of the incentive mechanism.(2) Based on the characteristics of distributed collaborative sensing and the experience of establishing centralized incentive mechanism ,a distributed reputation updating mechanism is proposed , then a distributed collaborative incentive mechanism is established.And also, the theoretical derivation and simulation were carried out to prove the effect of the incentive mechanism.