  We consider a dense cellular network, in which a limited-size cache is
available at every base station (BS). Coordinating content allocation across
the different caches can lead to significant performance gains, but is a
difficult problem even when full information about the network and the request
process is available. In this paper we present qLRU-$\Delta$, a general-purpose
dynamic caching policy that can be tailored to optimize different performance
metrics also in presence of coordinated multipoint transmission techniques. The
policy requires neither direct communication among BSs, nor a priori knowledge
of content popularity and, under stationary request processes, has provable
performance guarantees.
