Potential bargaining for resource allocation in cognitive relay transmission

Cooperative transmission between cognitive users can effectively decrease interference with primary users in underlay mode. Relay transmission between cognitive user and primary user can not only benefit the primary communications and facilitate the cognitive transmission too. Having obtain considerable profits from the cooperation, the primary user may lease its spectrum dynamically or upgrade the interference temperature timely for the cognitive user as a repayment. In this paper, we first consider a system model under the circumstances of Rayleigh fading channels which are coming close to real conditions. Then, we analyze the incomes of the primary transmitter in underlay mode and raise a rational scheme to compensate the cognitive relay by increasing certain interference temperature. In overlay mode, we propose an appropriate time-division pattern for the cooperative transmission under the deployment of dynamic spectrum leasing. Game theory is used when we resolve the bargaining problem of time division. Simulation tests are further run in MATLAB platform to prove the feasibilities of our proposals. The results demonstrate that both the primary and cognitive users can benefit from the cooperation. (C) 2013 Elsevier Ltd. All rights reserved.