Exploiting Route Robustness in Joint Routing and Spectrum Allocation in Multi-Hop Cognitive Radio Networks

In this paper, we introduce the concept of "route robustness" for path selection in multi-hop cognitive radio networks. We demonstrate that the aggregate throughput and robustness for routes determined by the introduced route robustness selection strategy are much better than those determined by other selection strategies as proposed in existing work. The rationale behind our approach is to guarantee a basic level of robustness for each route. We then jointly determine the routes and the spectrum allocation on each link along the routes such that the system throughput is maximized. The performance of the proposed mechanism is evaluated via simulations. The results show that our proposed mechanism can achieve better performance than other routing strategies.