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PhD defence by Rafhael Medeiros de Amorim


12.06.2019 kl. 12.30 - 16.00


“UAV Connectivity over Cellular Networks - Investigation of Command and Control Link Reliability”

The establishment of a reliable command and control (C2) communication link between the Unmanned Aerial Vehicles (UAVs), also known as drones, and its pilot/ command center is paramount to guarantee their safe integration into the airspace for long flight ranges. The present thesis investigate the challenges for public cellular networks, a natural main candidate, to provide this such high reliable services. In this thesis, the C2 connectivity provided is evaluated considering a target performance of 99.9 % reliability with maximum latency of 50 ms.

Field measurements demonstrated that the higher is the UAVs flight, more it is subjected to suffer and cause interference from/to a larger number of significant radio cells, even though the main signal also tends to see an increase in the received power.  The study demonstrates that, up to a certain extent, LTE technologies can support drone services, especially when drone-specific enhancement features are implemented. However to cope with the 99.9 % reliability requirements in the most stringent scenarios, some enhancements are required, such as the usage of directional antennas at the UAV side or the connectivity diversity introduced by a multi-operator or multi-carrier hybrid connection.

Assessment Committee
Professor, David Gesbert, EURECOM, France
Associate Professor, Rui Zhang, University of Singapore, Singapore
Associate Professor, Troels Pedersen, Aalborg University (Chairman)

Professor, Preben E. Mogensen, Aalborg University
Istvan Kovacs, NOKIA Bell labs – Jeroen Wigard, NOKIA Bell labs

Associate Professor, Gilberto Berardinelli, Aalborg University

After the defence there will be a reception at Niels Jernes Vej 14, Foyer

Please feel welcome to join



Free of charge


Wireless Communication Networks Section, Department of Electronic Systems


Aalborg University, Niels Jernes Vej 14, room 3-119