A Dynamic Spectrum Allocation Scheme with Interference Mitigation in Cooperative Networks

Future wireless systems are characterized by the pouring of diversified services supported by heterogeneous radio access technologies (RATs). In parallel with this, the tremendous demand for spectrum has brought the requirement of dynamic spectrum allocation (DSA) into our sight. This article aims at designing a centralized DSA scheme to enhance the spectrum utilization and maximize the profit of operators for cooperative wireless networks. In this scheme, the economic factor of the spectrum of wireless systems is considered in order to guarantee the fairness for the spectrum allocation. RATs are considered as cooperative players participating in cooperative games for spectrum allocation. As an attractive solution for n-person cooperative game with transferable utility, the Shapley value is adopted to handle the profit allocation among RATs. Particularly, we focus on the interference mitigation method, which is a fundamental issue for applying DSA to real wireless systems. The simulation results reveal that the proposed DSA scheme not only improves the spectrum utilization and the profit of operators, but also effectively restrains the inter-system interference between wireless networks under an acceptable level.