Caching UAV Assisted Secure Transmission in Small-Cell Networks

Abstract

Unmanned aerial vehicles (UAVs) can help small-cell base stations (SBSs) offload data traffic via wireless backhaul. However, the capacity of wireless backhaul is limited. In this paper, UAV assisted secure transmission for scalable videos in hyper-dense networks via caching is studied. In the proposed scheme, UAVs can replace SBSs to provide video streaming to mobile users in some small cells. To reduce the pressure of wireless backhaul, UAVs and SBSs are both equipped with caches to store scalable videos at off-peak time. To facilitate UAVs, a single antenna is equipped at each UAV, and thus, only the precoding matrices of SBSs should be cooperatively designed to manage interference. On the other hand, the SBSs replaced by UAVs will be idle. Thus, in order to guarantee the secure transmission, the idle SBSs can be further exploited to generate jamming signal to disrupt the eavesdropping, without affecting the legitimate transmission. Finally, simulation results are presented to verify the effectiveness of the proposed scheme.