Device-to-Device Data Storage with Regenerating Codes

TL;DR

This paper evaluates the use of regenerating codes for device-to-device data storage, demonstrating potential energy efficiency gains in wireless networks and identifying conditions where redundancy is most beneficial.

Contribution

It provides a comprehensive analysis of when regenerating codes outperform uncoded caching in D2D networks, considering energy consumption and data popularity thresholds.

Findings

Regenerating codes can significantly reduce energy consumption.

Redundancy benefits depend on data popularity thresholds.

Multiple redundant fragments outperform uncoded caching under certain conditions.

Abstract

Caching data files directly on mobile user devices combined with device-to-device (D2D) communications has recently been suggested to improve the capacity of wireless net6works. We investigate the performance of regenerating codes in terms of the total energy consumption of a cellular network. We show that regenerating codes can offer large performance gains. It turns out that using redundancy against storage node failures is only beneficial if the popularity of the data is between certain thresholds. As our major contribution, we investigate under which circumstances regenerating codes with multiple redundant data fragments outdo uncoded caching.