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In this paper, we investigate a hybrid caching strategy maximizing thesuccess transmission probability (STP) in a millimeter wave (mmWave)cache-enabled network. First, we derive theoretical expressions of the STP andthe average system transmission delay by utilizing stochastic geometry, then weconsider the maximization of the STP and the minimization of the average systemtransmission delay by optimizing the design parameters. Considering theoptimality structure of the NP-hard problem, the original problem istransferred into a multi-choice knapsack problem (MCKP). Finally, weinvestigate the impact of key network parameters on the STP and the averagesystem transmission delay. Numerical results demonstrate the superiority of theproposed caching strategy over the conventional caching strategies in themmWave cache-enabled networks.

Analysis and Optimization of Hybrid Caching in mmWave Networks with BS Cooperation