Fairness Optimization with Guaranteed QoS in Underlay NOMA for 5G Networks

Non-Orthogonal Multiple Access (NOMA) is an enabling technique proposed for the Fifth Generation (5G) and beyond. In NOMA every Resource Block (RB) such as a time slot, subcarrier, or spreading code is assigned to multiple users. Consequently, as the main goal of NOMA compared to Orthogonal Multiple Access (OMA) techniques, the number of supported users for each RB increases. Regarding the situation of the network, higher total network rate, fairness, Energy Efficiency (EE) and Spectrum Efficiency (SE), as the lateral NOMA goals compared to OMA, can be also achieved. In this paper, maximizing fairness by satisfying the required Quality of Service (QoS) for all users is investigated. Theoretical and simulation results present the superiority of the proposed model in optimizing fairness.