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

Device-Relaying in Cellular D2D Networks: A Fairness Perspective