Reactive Spectrum Sharing with Radio Dynamic Zones

Radio Dynamic Zones (RDZs) are emerging as a means to enable dynamic spectrum sharing. Passive services like remote satellite sensing, radio astronomy, and earth sciences are vital candidates to share spectrum with RDZs. RDZs must protect sensitive receivers outside the zone from undesirable interference from secondary spectrum use inside the zone. We develop a scalable, novel reactive framework to minimize interference at the sensitive receivers while maximizing spectrum utilization within the zone. We utilize interference supervision at the sensitive receiver site to manage allocation decisions. We present a complete, viable, and deployable spectrum management solution and evaluate its operation both in over-the-air experiments using the POWDER wireless testbed and by simulating a real spectrum-sharing scenario with a sensitive receiver and varying sizes of RDZs at long distances. By incorporating location information, propagation characteristics, and an exponentially weighted moving average of the number of RDZ users sharing the band we achieve lower interference periods at the sensitive receiver and high spectrum utilization in the RDZ.