Fast Distributed Resource Allocation for Multi-Cell Cognitive Radio Systems
Maïté Brandt-Pearce, Kimmo Kansanen, Geir Egil Øien · 2010
Cognitive radio offers an attractive means of utilizing spectral resources opportunistically, yet relies on an agreement that the secondary users do not interfere with the primary users. This system-wide constraint makes distributed resource allocation difficult. In this paper, sum rates for a multiuser cognitive radio system under received power constraints are derived and optimal and suboptimal power assignments are found for orthogonal resource sharing and simultaneous transmission scenarios. By allocating a portion of the primary user constraints to each basestation, a novel rate-maximizing distributed technique by which each multi-antenna basestation controls the parameters of its own secondary users is proposed and evaluated. Though suboptimal, the computational burden of the proposed algorithm is minimal compared to the NP-hard optimal solution.