1 research outputs found
Uplink NOMA for Cellular-Connected UAV: Impact of UAV Trajectories and Altitude
This paper considers an emerging cellular-connected unmanned aerial vehicle
(UAV) architecture for surveillance or monitoring applications. We consider a
scenario where a cellular-connected aerial user equipment (AUE) periodically
transmits in uplink, with a given data rate requirement, while moving along a
given trajectory. For efficient spectrum usage, we enable the concurrent uplink
transmission of the AUE and a terrestrial user equipment (TUE) by employing
power-domain aerial-terrestrial non-orthogonal multiple access (NOMA), while
accounting for the AUE's known trajectory. To characterize the system
performance, we develop an analytical framework to compute the rate coverage
probability, i.e., the probability that the achievable data rate of both the
AUE and TUE exceeds the respective target rates. We use our analytical results
to numerically determine the minimum height that the AUE needs to fly, at each
transmission point along a given trajectory, in order to satisfy a certain
quality of service (QoS) constraint for various AUE target data rates and
different built-up environments. Specifically, the results show that the
minimum height of the AUE depends on its distance from the BS as the AUE moves
along the given trajectory. Our results highlight the importance of modeling
AUE trajectory in cellular-connected UAV systems.Comment: submitted to the IEEE for possible publicatio