Energy-Efficiency Gains of Caching for Interference Channels

TL;DR

This paper explores how caching can improve energy efficiency in Gaussian interference channels at low SNR by enabling transmitter cooperation through content overlaps, balancing beamforming and multicasting gains.

Contribution

It introduces a caching strategy that creates content overlaps to facilitate transmitter cooperation, demonstrating near-optimal performance in specific scenarios.

Findings

Cooperation via caching yields beamforming gains.

Strategy is approximately optimal for single-receiver and single-transmitter cases.

Caching improves energy efficiency in interference channels.

Abstract

This paper initiates the study of energy-efficiency gains provided by caching. We focus on the cache-aided Gaussian interference channel in the low-SNR regime. We propose a strategy that creates content overlaps at the transmitter caches to allow for co-operation between the transmitters. This co-operation yields a beamforming gain, which has to be traded off against a multicasting gain. We evaluate the performance of this strategy and show its approximate optimality in both the single-receiver case and the single-transmitter case.