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

Algorithm 1

K-means clustering algorithm.

(1)	Input:
(2)	The placements of ground users.
(3)	The number of clusters .
(4)	Start
(5)	Initialize the locations of the centroids randomly
(6)	Repeat until convergence
	For every ground user , set
	For each cluster , set
(7)	Output:
(8)	Clusters.