Optimal coded caching in heterogeneous networks with uncoded prefetching
Emanuele Parrinello, Ayşe Ünsal, Petros Elia · 2018
In the context of caching in heterogeneous networks, the work explores the setting where a multi-antenna transmitter (No antennas), broadcasts to K receiving users, each assisted by one of Λ ≤ K helper nodes serving as limited-sized caches. Our aim is to identify the limits of coded caching when there are fewer caches than users (Λ0, adding a single degree of cache-redundancy yields a caching-gain increase equal to No, and similarly, adding antennas has a multiplicative DoF impact where for example introducing a second transmit antenna can double the DoF.