Cache-enabled small cell networks: modeling and tradeoffs.
Cache-enabled small cell networks: modeling and tradeoffs.
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DOI：
10.1186/s13638-015-0250-4
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发表时间：
2015
影响因子：
2.6
通讯作者：
Debbah M
中科院分区：
文献类型：
--
作者：
Baştuǧ E;Bennis M;Kountouris M;Debbah M
我们考虑一种网络模型，其中小型基站（SBS）具有缓存能力，以此作为减轻回程负载和满足用户需求的一种手段。SBS根据泊松点过程（PPP）在平面上随机分布，并通过以下两种方式为用户提供服务：（i）通过有限速率的回程从互联网获取内容；（ii）从本地缓存为用户提供服务。我们推导出了中断概率和平均传输速率作为信干噪比（SINR）、SBS密度、目标文件比特率、存储大小、文件长度和文件流行度的函数的闭式表达式。然后，我们分析了关键操作参数对系统性能的影响。结果表明，可以通过增加基站数量或总存储大小来实现一定的中断概率。我们的结果和分析为部署具有缓存功能的小蜂窝网络（SCN）提供了关键见解，这种网络被视为未来异构蜂窝网络的一种有前途的解决方案。
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.