Mobility-Aware Coded Storage and Delivery

TL;DR

This paper proposes a mobility-aware coded storage and delivery scheme for small-cell networks that significantly reduces backhaul load and the number of sub-files needed, enhancing practical content caching for mobile users.

Contribution

It introduces a novel coded storage and delivery scheme tailored for mobile users in heterogeneous networks, reducing backhaul load and sub-file requirements.

Findings

Achieves a lower backhaul delivery rate compared to existing schemes.

Reduces the number of sub-files needed for delivery.

Demonstrates practical viability of the proposed scheme.

Abstract

Content caching at small-cell base stations (SBSs) is a promising method to mitigate the excessive backhaul load and delay, particularly for on-demand video streaming applications. A cache-enabled heterogeneous cellular network architecture is considered in this paper, where mobile users connect to multiple SBSs during a video downloading session, and the SBSs request files, or fragments of files, from the macro-cell base station (MBS) according to the user requests they receive. A novel coded storage and delivery scheme is introduced to reduce the load on the backhaul link from the MBS to the SBSs. The achievable backhaul delivery rate as well as the number of sub-files required to achieve this rate are studied for the proposed coded delivery scheme, and it is shown that the proposed scheme provides significant reduction in the number of sub-files required, making it more viable for practical applications.