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This paper focuses on edge caching in mm/{\mu}Wave hybrid wireless networks,in which all mmWave SBSs and {\mu}Wave MBSs are capable of storing contents toalleviate the traffic burden on the backhaul link that connect the BSs and thecore network to retrieve the non-cached contents. The main aim of this work isto address the effect of capacity-limited backhaul on the average successprobability (ASP) of file delivery and latency. In particular, we consider amore practical mmWave hybrid beamforming in small cells and massive MIMOcommunication in macro cells. Based on stochastic geometry and a simpleretransmission protocol, we derive the association probabilities by which theASP of file delivery and latency are derived. Taking no caching event as thebenchmark, we evaluate these QoS performance metrics under MC and UC placementpolicies. The theoretical results demonstrate that backhaul capacity indeed hasa significant impact on network performance especially under weak backhaulcapacity. Besides, we also show the tradeoff among cache size, retransmissionattempts, ASP of file delivery, and latency. The interplay shows that cachesize and retransmission under different caching placement schemes alleviatesthe backhaul requirements. Simulation results are present to valid ouranalysis.

Analysis of Cached-Enabled Hybrid Millimter Wave & Sub-6 GHz Massive MIMO Networks