Efficient 3D Positioning of UAVs and User Association Based on Hybrid PSO-<i>K</i>-Means Clustering Algorithm in Future Wireless Networks

<div>3D location of UAVs and user-UAVs association in (a) user-centric approach and (b) network-centric approach.</div>

Mobile Information Systems

Figure 2: Efficient 3D Positioning of UAVs and User Association Based on Hybrid PSO-<i>K</i>-Means Clustering Algorithm in Future Wireless Networks 