ON/OFF Reporting Mechanism for Robust Cooperative Sensing in Cognitive IoT Networks

In this paper, we propose an ON#x002F;OFF reporting mechanism for cooperative sensing of cognitive radio so that reporting overhead from secondary sensing users to a fusion center can be significantly reduced. The significant reduction in reporting overhead of ON#x002F;OFF reporting contributes to power saving, which in turn realizes robust reporting to fusion center by overcoming channel fading. Furthermore, ON#x002F;OFF reporting enables graceful degradation when sensing nodes fail during operation. Instead of using AND rule, we propose an iNOR rule that can achieve O(1) reporting overhead in total, irrespective of the number of sensing nodes. The asymptotic overhead value is given by P(H1)log(1#x002F;Pd), where P(H1) is the probability of primary user's presence and Pd is the target detection probability. We also show that OR rule has its asymptotically negligible reporting overhead given by P(H1)log(1#x002F;(1-Pd)). Simulation results show that with the proposed technique fusion center can make a reliable decision to avoid harmful interference to primary user.