  National radio dynamic zone (NRDZs) are intended to be geographically bounded
areas within which controlled experiments can be carried out while protecting
the nearby licensed users of the spectrum. An NRDZ will facilitate research and
development of new spectrum technologies, waveforms, and protocols, in typical
outdoor operational environments of such technologies. In this paper, we
introduce and describe an NRDZ concept that relies on a combination of
autonomous aerial and ground sensor nodes for spectrum sensing and radio
environment monitoring (REM). We elaborate on key characteristics and features
of an NRDZ to enable advanced wireless experimentation while also coexisting
with licensed users. Some preliminary results based on simulation and
experimental evaluations are also provided on out-of-zone leakage monitoring
and real-time REMs.
