Cache Placement Optimization in D2D-assisted Wireless Cognitive Networks

Cache Placement Optimization in D2D-assisted Wireless Cognitive Networks

In this paper, we consider the cooperative caching in wireless cognitive device-to-device (D2D) network, where unlicensed users can use under-utilized licensed spectrum and cached contents can be shared by cooperating with each other. We formulate the cooperative caching problem to minimize the download time of mobile users. A heuristic caching strategy is then proposed to handle the content placement in the caches. Simulation results show that the proposed caching scheme can significantly reduce total download time compared with the traditional caching scheme.