Abstract:
In this paper, we study and optimize the trajectory
for unmanned aerial vehicle (UAV) to provide fifth-generation
(5G) cellular service to users in a given area. We consider a single
UAV launched from the fixed initial to the final location, during
which it serves the ground users that are distributed in a circular
field. We introduced an optimization problem to minimize the
average outage probability of the system by optimizing the threedimensional (3D) trajectory of the UAV. As this problem is nonconvex, we proposed an efficient approach that involves two steps,
firstly it frames a new problem to obtain a globally optimal
location in 3D space for minimal average outage probability.
This problem is shown to be conditionally convex and an efficient
algorithm is proposed to obtain a globally optimal location within
an acceptable tolerance. Thereafter, a sub-optimal solution is
proposed for the original problem. Simulation results provide
useful insights into the sub-optimal trajectory of UAV and show
that our proposed approach on an average provides 24% outage
improvement over the benchmark scheme. This improvement is
further enhanced with the increase in the velocity of UAV.
