  In this paper, we investigate asynchronous coded caching in fog radio access
networks (F-RAN). 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 in 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 simulation results
show that our proposed scheme creates considerable coded-multicasting
opportunities in asynchronous request scenarios.
