Multiple Unmanned-Aerial-Vehicles Deployment and User Pairing for Nonorthogonal Multiple Access Schemes

Nonorthogonal multiple access (NOMA) significantly improves the connectivity opportunities and enhances spectrum efficiency (SE) in fifth generation beyond (B5G) wireless communications. Meanwhile, emerging B5G services demand for higher SE NOMA-based However, traditional ground-to-ground (G2G) communications are hard to satisfy these demands, especially cellular uplinks. To solve challenges, this article proposes a unmanned-aerial-vehicles (UAVs)-aided uplink NOMA method. In detail, hovering UAVs relay data half of ground users (GUs) share spectrums with other GUs that communicate base station (BS) directly. Furthermore, K-means clustering-based UAV deployment scheme location-based user pairing (UP) optimize transceiver association UAVs-aided Finally, sum power minimization-based resource allocation problem is formulated lowest Quality-of-Service (QoS) constraints. We it message-passing algorithm evaluate superior performances proposed scheduling paring schemes on energy (EE). Extensive simulations conducted compare those single UAV-aided uplinks, G2G-based uplinks facility location framework-based deployment. Simulation results demonstrate UP-based EE at cost only little relaying consumption UAVs.