  Unmanned aerial vehicle (UAV)-enabled communication networks are promising in
the fifth and beyond wireless communication systems. In this paper, we shed
light on three UAV-enabled mobile edge computing (MEC) architectures. Those
architectures have been receiving ever increasing research attention for
improving computation performance and decreasing execution latency by
integrating UAV into MEC networks. We present a comprehensive survey for the
state-of-the-art research in this domain. Important implementation issues are
clarified. Moreover, in order to provide an enlightening guidance for future
research directions, key challenges and open issues are discussed.
