Cross-layer optimal spectrum sensing duration and scheduling in cognitive networks

Abstract

We explore the effects of spectrum sensing time parameters on non-cooperative dynamic spectrum access by jointly considering the PHY layer sensing and the MAC layer sensing scheduling. Our work not only incorporates singular sensing performance measures in terms of the probability of missed detection and false alarm, but also takes into account the likeliness of missed detection of busy-idle channel state transitions between consecutive sensing executions. In this paper, we develop two metrics to quantify the spectrum sensing performance of a singular node, namely the spectrum efficiency for detecting available spectrum and the sensing robustness for avoiding interference to primary users, and present a general framework for deriving the desired results, which accommodates various primary channel occupancy patterns.