We consider a network model where small base stations (SBSs) have caching
capabilities as a means to alleviate the backhaul load and satisfy users'
demand. The SBSs are stochastically distributed over the plane according to a
Poisson point process (PPP), and serve their users either (i) by bringing the
content from the Internet through a finite rate backhaul or (ii) by serving
them from the local caches. We derive closed-form expressions for the outage
probability and the average delivery rate as a function of the
signal-to-interference-plus-noise ratio (SINR), SBS density, target file
bitrate, storage size, file length and file popularity. We then analyze the
impact of key operating parameters on the system performance. It is shown that
a certain outage probability can be achieved either by increasing the number of
base stations or the total storage size. Our results and analysis provide key
insights into the deployment of cache-enabled small cell networks (SCNs), which
are seen as a promising solution for future heterogeneous cellular networks.

研究了在具有缓存能力的小型基站网络模型中，通过确定性分布或本地缓存满足用户需求的方式，分析了系统性能的关键操作参数，并演示了目标文件比特率、存储大小、文件长度和文件流行度对故障概率和平均交付速率的影响。