IC-CRP: An Interference-Constrained Routing Protocol for Multi-Hop Cognitive Radio Ad Hoc Networks
Baoming Sun, Wei Xie?, Lei Zhu, Ning Li and Jianfeng Zhang
Cognitive radio (CR) technology is a revolutionary communication paradigm. It enables secondary users (SUs) to sense and access the opportunistic spectrum holes left by idle primary users (PUs) for improving spectrum efficiency. However, the access of SUs must not interfere with the operation of PUs. In this paper, an Interference-Constrained Cognitive Routing protocol (IC-CRP) is proposed, which routes data across the regions with fewer primary receivers in multihop Cognitive Radio Ad Hoc Networks (CRAHNs). We elaborate on the availability of frequency bands and introduce a new metric to evaluate the interference from SUs to primary networks. Furthermore, the routing problem is transformed into an optimization problem under some constraints. Eventually, we evaluate the performance of IC-CRP in terms of end-to-end delay, throughput and interference to primary networks. Simulation results demonstrate that our scheme significantly outperforms two existing schemes under a wide range of scenarios.
Keywords: Cognitive radio, spectrum efficiency, interference-constrained, routing protocol, end-to-end delay, throughput, CRAHNs.