Complete Interference Mitigation Through Receiver-Caching in Wyner's Networks

TL;DR

This paper establishes bounds on the per-user multiplexing gain in Wyner's networks with receiver caches, showing that large caches can fully eliminate interference, matching the performance of interference-free links.

Contribution

It provides tight bounds on multiplexing gain in Wyner's models with receiver caching, demonstrating complete interference mitigation with sufficiently large cache memories.

Findings

Per-user multiplexing gain is 1 + μ/D with large caches.

Receiver caches can fully mitigate interference in Wyner's networks.

Bounds are tight for specific cache memory thresholds.

Abstract

We present upper and lower bounds on the per-user multiplexing gain (MG) of Wyner's circular soft-handoff model and Wyner's circular full model with cognitive transmitters and receivers with cache memories. The bounds are tight for cache memories with prelog $\mu\geq 2/3D$ in the soft-handoff model and for $\mu \geq D$ in the full model, where $D$ denotes the number of possibly demanded files. In these cases the per-user MG of the two models is $1+\mu/D$, the same as for non-interfering point-to-point links with caches at the receivers. Large receiver cache-memories thus allow to completely mitigate interference in these networks.