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Maddah-Ali and Niesen (MAN) in 2014 showed that coded caching in singlebottleneck-link broadcast networks allows serving an arbitrarily large numberof cache-equipped users with a total link load (bits per unit time) that doesnot scale with the number of users. Since then, the general topic of codedcaching has generated enormous interest both from the information theoretic and(network) coding theoretic viewpoint, and from the viewpoint of applications.Building on the MAN work, this paper considers a particular network topologyreferred to as cache-aided Fog Radio Access Network (Fog-RAN), that includes aMacro-cell Base Station (MBS) co-located with the content server, severalcache-equipped Small-cell Base Stations (SBSs), and many users without caches.Some users are served directly by the MBS broadcast downlink, while other usersare served by the SBSs. The SBSs can also exchange data via rounds of directcommunication via a side channel, referred to as "sidelink". For this novelFog-RAN model, the fundamental tradeoff among (a) the amount of cache memory atthe SBSs, (b) the load on the downlink (from MBS to directly served users andSBSs), and (c) the aggregate load on the sidelink is studied, under thestandard worst-case demand scenario. Several existing results are recovered asspecial cases of this network model and byproduct results of independentinterest are given. Finally, the role of topology-aware versustopology-agnostic caching is discussed.

On the Fundamental Limits of Fog-RAN Cache-aided Networks with Downlink and Sidelink Communications