Primary and Secondary Social Activity Aware Routing for Cognitive Radio Networks

In cognitive radio networks(CRNs), efficient spectrum access is challenging and whitespace are necessary for communicating pairs, including Primary Users (PUs) and Secondary Users (SUs). In the existing works, available whitespace is determined by PUs' social activities, which has drawn much attention and been investigated. In reality, SUs need to compete with each other in obtaining accessible whitespace. To the best of our knowledge, the modeling and integration of SUs' social activities have not been considered in real whitespace analysis. Inspired by this motivation, we propose an solution aiming to attaining accessible whitespace, which considers the available whitespace determined by primary activities and the competitions based on secondary activities. Furthermore, we take a spectrum aware routing, including accessible whitespace and routing convergence, as an example to demonstrate the advantage of this proposed solution. The simulation experiments conducted on real world datasets verify the difference between available whitespace and accessible whitespace, and also show the adaptiveness of the proposed algorithm in terms of average delivery ratio and average delay.