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On-demand deployments of millimeter-wave (mmWave) access points (APs) carriedby unmanned aerial vehicles (UAVs) are considered today as a potential solutionto enhance the performance of 5G+ networks. The battery lifetime of modernUAVs, though, limits the flight times in such systems. In this letter, weevaluate a feasible deployment alternative for temporary capacity boost in theareas with highly fluctuating user demands. The approach is to land UAV-basedmmWave APs on the nearby buildings instead of hovering over the area. Withinthe developed mathematical framework, we compare the system-level performanceof airborne and landed deployments by taking into account the full operationcycle of the employed drones. Our numerical results demonstrate that the choiceof the UAV deployment option is determined by an interplay of the separationdistance between the service area and the UAV charging station, drone batterylifetime, and the number of aerial APs in use. The presented methodology andresults can support efficient on-demand deployments of UAV-based mmWave APs inprospective 5G+ networks.

Hover or Perch: Comparing Capacity of Airborne and Landed Millimeter-Wave UAV Cells