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Airborne base stations (carried by drones) have a great potential to enhancecoverage and capacity of cellular networks. Multiple scenarios and use caseswill highly benefit from such technology such as (i) offloading terrestrialbase stations (BSs) in dense and urban areas, and (ii) providing coverage forrural areas. However, one of the main challenges facing the deployment ofairborne BSs is the limited available energy at the drone, which limits theflight time. In fact, most of the currently used unmanned aerial vehicles(UAVs) can only operate for one hour maximum. This limits the performance ofthe UAV-enabled cellular network due to the need to frequently visit the groundstation to recharge, leaving the UAV's coverage area temporarily out ofservice. In this article, we propose a new UAV-enabled cellular network setupbased on tethered UAVs (TUAVs). In the proposed setup, the TUAV is connected toa ground station (GS) through a tether, which provides the TUAV with bothenergy and data. This enables a flight that can stay for days. We describe indetail the components of the proposed system. Furthermore, we enlist the mainadvantages of a TUAV-enabled cellular network compared to typical untetheredUAVs. Next, we discuss the potential applications and use cases for TUAVs.Finally, we discuss the challenges, design considerations, and future researchdirections to realize the proposed setup.

Aerial Base Stations Deployment in 6G Cellular Networks using Tethered Drones: The Mobility and Endurance Trade-off