Distributed Spectrum Allocation for Autonomous Cognitive Radio Networks

Inhalt:
Cognitive Radio is a broadly discussed approach for better spectrum utilization by allowing Secondary Users (SU) the temporary usage of non-occupied spectrum licensed to Primary Users (PU). With the Non-Contiguous OFDM transmission technique even strongly fragmented spectrum can be efficiently accessed by SUs. In this paper, we consider a set of independent, autonomous groups of SUs (networks consisting of a base station and a set of client stations) to operate in a shared set of temporary reusable frequencies. We present a fair, distributed spectrum allocation algorithm with low computational complexity and low control data overhead. Our approach assures that in case a PU is reclaiming some spectrum this will affect all co-located SU groups in the same fair manner. Simulation results demonstrate the convincing efficiency of this algorithm as compared with a centralized, optimal solution.