Cache-Aided Non-Orthogonal Multiple Access

TL;DR

This paper introduces a joint caching and NOMA scheme that leverages cached data for interference cancellation, significantly improving downlink transmission efficiency and reducing video file delivery times in next-generation cellular networks.

Contribution

It proposes a novel cache-aided NOMA scheme that exploits cached data for interference cancellation and flexible decoding, enhancing transmission rates and reducing delivery times.

Findings

Achieves a larger rate region compared to baseline schemes.

Reduces file delivery times significantly.

Enables flexible decoding order for performance optimization.

Abstract

In this paper, we propose a novel joint caching and non-orthogonal multiple access (NOMA) scheme to facilitate advanced downlink transmission for next generation cellular networks. In addition to reaping the conventional advantages of caching and NOMA transmission, the proposed cache-aided NOMA scheme also exploits cached data for interference cancellation which is not possible with separate caching and NOMA transmission designs. Furthermore, as caching can help to reduce the residual interference power, several decoding orders are feasible at the receivers, and these decoding orders can be flexibly selected for performance optimization. We characterize the achievable rate region of cache-aided NOMA and investigate its benefits for minimizing the time required to complete video file delivery. Our simulation results reveal that, compared to several baseline schemes, the proposed cache-aided NOMA scheme significantly expands the achievable rate region for downlink transmission, which translates into substantially reduced file delivery times.