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In this paper, we propose a novel secure random caching scheme forlarge-scale multi-antenna heterogeneous wireless networks, where the basestations (BSs) deliver randomly cached confidential contents to the legitimateusers in the presence of passive eavesdroppers as well as active jammers. Inorder to safeguard the content delivery, we consider that the BSs transmits theartificial noise together with the useful signals. By using tools fromstochastic geometry, we first analyze the average reliable transmissionprobability (RTP) and the average confidential transmission probability (CTP),which take both the impact of the eavesdroppers and the impact of the jammersinto consideration. We further provide tight upper and lower bounds on theaverage RTP. These analytical results enable us to obtain rich insights intothe behaviors of the average RTP and the average CTP with respect to key systemparameters. Moreover, we optimize the caching distribution of the files tomaximize the average RTP of the system, while satisfying the constraints on thecaching size and the average CTP. Through numerical results, we show that ourproposed secure random caching scheme can effectively boost the secrecyperformance of the system compared to the existing solutions.

Enhancing Physical Layer Security of Random Caching in Large-Scale Multi-Antenna Heterogeneous Wireless Networks