Efficient and Fair Bandwidth Allocation in Multichannel Cognitive Radio Networks
Cognitive Radio (CR) improves spectrum efficiency by allowing Secondary Users (SUs) to dynamically exploit the idle spectrum owned by Primary Users (PUs). This paper studies optimal bandwidth allocation of SUs for throughput efficiency. Consider the following tradeoff: an SU increases its instantaneous throughput by accessing more spectrum, but channel access/switching overhead, contention among multiple SUs, and dynamic PU activity create higher liability for larger bandwidths. So how much is too much? In this paper, the authors study the optimal bandwidth allocation for multiple SUs. Their approach is twofold. They first study the optimal bandwidth an SU should use to maximize the per-SU throughput in the long term.