Attack-Resistant Trust-Based Weighted Majority Game Rule for Spectrum Sensing in Cognitive Radio Networks

In collaborative sensing, a cognitive radio node cooperates with others in the spectrum sensing process for a more accurate sensing decision. A malicious node may launch Spectrum Sensing Data Falsification (SSDF) in which the local sensing report is falsified before it reaches the fusion center (FC). The task of FC is to aggregate local sensing reports from the collaborating nodes, thereby arriving at a final sensing decision. In this paper, we propose two attack-resistant trust-based decision rules: WMR (Weighted Majority Rule) and WMRR (Weighted Majority Rule with Redemption). These rules are based on the weighted majority game. The key feature in these rules is that the contribution of a sensing report in the final decision depends not merely on the report but also on the trust that the FC has on the node sending out the report. We support the validity of the proposed rules through extensive simulation results.