Optimal design and performance analysis of non-terrestrial network with non-orthogonal multiple access

Abstract

In B5G/6G communication, non-terrestrial network (NTN) is evaluated as an up-and-coming solution to overcome the coverage limitations of ground networks by providing global connectivity over high-capacity wireless backhaul links. In addition, non-orthogonal multiple access (NOMA) is receiving great attention as a next-generation communication technology that can efficiently use limited frequency resources. Motivated by this trend, we study the NTN with NOMA in this paper. Specifically, two NTN scenarios are considered. In the first scenario, we address the UAV-aided data relaying system utilizing millimeter wave (mmWave) backhaul with NOMA, and the optimization problem of maximizing end to end data throughput is investigated. In the second scenario, an optimization problem minimizing uplink delay is studied in space-air-ground integrated network (SAGIN) with NOMA. Based on the convex optimization theory, matching theory, and heuristic method, we propose algorithms that can efficiently obtain solutions for each problem. Finally, the superiority of the proposed algorithm is demonstrated compared to benchmark schemes.