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This paper explores the physical-layer security in a small cell network (SCN)with cooperative cache-enabled small base stations (SBSs) in the presence ofrandomly distributed eavesdroppers. We propose a joint design on the cachingplacement and the physical-layer transmission to improve the secure contentdelivery probability (SCDP). We first put forward a hybrid caching placementstrategy in which a proportion of the cache unit in each SBS is assigned tostore the most popular files (MPFs), while the remaining is used to cache thedisjoint subfiles (DSFs) of the less popular files in different SBSs as a meansto enhance transmission secrecy and content diversity. We then introduce twocoordinated multi-point (CoMP) techniques, namely, joint transmission (JT) andorthogonal transmission (OT), to deliver the MPFs and DSFs, respectively. Wederive analytical expressions for the SCDP in each transmission scheme,considering both non-colluding and colluding eavesdropping scenarios. Based onthe obtained analytical results, we jointly design the optimal transmissionrates and the optimal caching assignment for maximizing the overall SCDP.Various insights into the optimal transmission and caching designs are furtherprovided. Numerical results are also presented to verify our theoreticalfindings and to demonstrate the superiority of the proposed caching andtransmission strategies.

Physical-Layer Security in Cache-Enabled Cooperative Small Cell Networks Against Randomly Distributed Eavesdroppers