User Fairness in NOMA-HetNet Using Optimized Power Allocation and Time Slotting

Exponential growth in number of users with diverse data rate requirements has lead to the heterogeneity traditional cellular networks. To support massive users, nonorthogonal multiple access (NOMA) emerged as a promising solution achieve increased connections and higher spectral gains compared orthogonal (OMA). However, studies show that weak (WU) strong (SU) served using NOMA (referred NOMA-group) experience different throughputs. In group, an SU achieves throughput than WU. Further, group increases, due superposition signal NOMA, intra-group interference dominates, thereby reducing WUs. This article proposes novel time slotting (TS) techniques aims at user fairness amongst by increasing WUs, especially when increases group. The power allocation coefficients slot duration for proposed TS are optimized satisfy minimum each while maximizing between is measured calculating both quality service experienced user. It observed technique improves measures significantly. Furthermore, energy efficiency (EE) also calculated duration. numerical results suggest improvement EE system along enhancing users.