A risk-estimation based spectrum leasing scheme for cellular networks

The existing spectrum sharing schemes in cognitive radio have difficulties on guaranteeing the quality of service of secondary system. This paper proposes a risk-estimation based spectrum leasing (RESL) scheme which applies to cellular networks in cognitive radio. In RESL, primary systems are not privileged to take back the spectrum leased unconditionally, and determine whether to lease spectrum according to leasing cost function which is used to estimate the cost of leasing spectrum. Simulation results show the RESL could guarantee the QoS of secondary system. The performance of PS is also mildly satisfied.