Capacity of Cellular Networks with Femtocache

TL;DR

This paper investigates how decentralized caching, especially coded caching, can significantly enhance the capacity of cellular networks with femtocaches by leveraging user terminal storage and multihop communication.

Contribution

It introduces a new decentralized coded caching scheme that outperforms uncoded caching, achieving capacity improvements proportional to log(n) in femtocache-based cellular networks.

Findings

Coded caching increases network capacity by a factor of log(n).

Decentralized caching schemes are effective for cellular networks.

User terminal storage can be effectively utilized to enhance capacity.

Abstract

The capacity of next generation of cellular networks using femtocaches is studied when multihop communications and decentralized cache placement are considered. We show that the storage capability of future network User Terminals (UT) can be effectively used to increase the capacity in random decentralized uncoded caching. We further propose a random decentralized coded caching scheme which achieves higher capacity results than the random decentralized uncoded caching. The result shows that coded caching which is suitable for systems with limited storage capabilities can improve the capacity of cellular networks by a factor of log(n) where n is the number of nodes served by the femtocache.