UAV	Unmanned Aerial Vehicle
QoS	Quality of Service
D2D	Device-to-Device
IoT	Internet of Things
EH	Energy Harvesting
EE	Energy Efficiency
CU	Cellular User
DU	D2D User
SCA	Successive Convex Approximation
SWIPT	Simultaneous Wireless Information and Power Transfer
BA	Beam Alignment
ES	Exhaustive Search
PSO	Particle Swarm Optimization
NOMA	Non-Orthogonal Multiple Access