Analysis and Optimization of Local Delay for Cache-Enabled Networks with Random DTX

In this paper, we focus on the local delay for the cache-enabled networks where the locations of the base stations (BSs) are modeled as a Poisson point process (PPP). With the application of the random caching and the random discontinuous transmission (DTX) schemes, we derive the closed-form expression of the mean local delay. We then consider the minimization of the mean local delay by jointly optimizing the caching probability and the BS active probability. Finally, the numerical results demonstrate the superiority of the proposed optimization schemes over the existing caching strategies and reveal the impacts of the key network parameters on the cache-enabled networks in terms of mean local delay.