Exploiting Secondary Caching for Cooperative Cognitive Radio Networks

摘要

This letter proposes a cache-enabled cooperation scheme to improve the performance of cognitive radio networks. We jointly optimize the content placement and the bandwidth allocation to maximize the secondary users' average successful transmission probability under the quality of service constraint of the primary user. Although the original problem is not convex, an efficient two-level bisection search algorithm is proposed to find the optimal cache and spectrum allocation solution to the approximated problem. Simulation results verify that the cache-enabled cooperation outperforms existing schemes significantly.