Device-Relaying in Cellular D2D Networks: A Fairness Perspective

TL;DR

This paper investigates device relaying in cellular D2D networks, demonstrating that a multi-way channel approach significantly improves fairness among users compared to traditional methods.

Contribution

It introduces a novel multi-way channel perspective for device relaying in D2D networks, achieving better fairness in user communication.

Findings

Significant fairness gains with the proposed scheme.

Multi-way channel approach outperforms traditional models.

Enhanced symmetric rate support for users.

Abstract

Device-to-Device (D2D) communication is envisioned to be an integral component of 5G networks, and a technique for meeting the demand for high data rates. In a cellular network, D2D allows not only direct communication between users, but also device relaying. In this paper, a simple instance of device-relaying is investigated, and the impact of D2D on fairness among users is studied. Namely, a cellular network consisting of two D2D-enabled users and a base-station (BS) is considered. Thus, the users who want to establish communication with the BS can act as relays for each other's signals. While this problem is traditionally considered in the literature as a multiple-access channel with cooperation in the uplink, and a broadcast channel with cooperation in the downlink, we propose a different treatment of the problem as a multi-way channel. A simple communication scheme is proposed, and is shown to achieve significant gain in terms of fairness (measured by the symmetric rate supported) in comparison to the aforementioned traditional treatment.