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Beyond visual line-of-sight connectivity is key for use cases of unmannedaerial vehicles (UAVs) such as package delivery, infrastructure inspection, andrescue missions. Cellular networks stand ready to support flying UAVs byproviding wide-area, quality, and secure connectivity for UAV operations.Ensuring reliable connections in the presence of UAV movements is important forsafety control and operations of UAVs. With increasing height above the ground,the radio environment changes. Using terrestrial cellular networks to provideconnectivity to the UAVs moving in the sky may face new challenges. In thisarticle, we share some of our findings in mobility support for cellularconnected UAVs. We first identify how the radio environment changes withaltitude and analyze the corresponding implications on mobility performance. Wethen present evaluation results to shed light on the mobility performance ofcellular connected UAVs. We also discuss potential enhancements for improvingmobility performance in the sky.

Mobility Support for Cellular Connected Unmanned Aerial Vehicles: Performance and Analysis