In this paper, we investigate the problem of asynchronous coded caching in fog radio access networks (F-RANs). To minimize the fronthaul load, the encoding set collapsing rule and encoding set partition method are proposed to establish the relationship between the coded-multicasting contents for asynchronous and synchronous coded caching. Furthermore, a decentralized asynchronous coded caching scheme is proposed, which provides asynchronous and synchronous transmission methods for different delay requirements. The closed-form expression of the fronthaul load is established for the special case where the number of requests during each time slot is fixed, and the upper and lower bounds of the fronthaul load are given for the general case where the number of requests during each time slot is random. The simulation results show that our proposed scheme can create considerable coded-multicasting opportunities in asynchronous request scenarios.

中文翻译：

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雾无线接入网中分散式异步编码缓存设计与性能分析

在本文中，我们研究了雾无线接入网络 (F-RAN) 中的异步编码缓存问题。为了最小化前传负载，提出了编码集折叠规则和编码集划分方法来建立异步和同步编码缓存的编码组播内容之间的关系。此外，提出了一种分散的异步编码缓存方案，该方案为不同的延迟要求提供了异步和同步传输方法。对于每个时隙的请求数固定的特殊情况，建立前传负载的闭式表达式，对于每个时隙的请求数固定的一般情况，给出前传负载的上下界。时间段是随机的。