Author(s)
Swaroop Gopalam, Randall Berry, Dongning Guo, and Michael Honig
Abstract
The Citizen Broadband Radio Service (CBRS) band is shared by the incumbent users (mainly consisting of Navy radars) and two tiers of licensed users. The incumbent users take priority and must be protected from the interference from the other tiers. Currently, this task relies on overnight computations based on future knowledge of Navy’s drills, licensed user activity and propagation models, often requiring large margins to deal with uncertainty. We propose alternative beacon and sensing mechanisms for promoting efficient spectrum sharing in the CBRS band. We consider two approaches – In the first, the sensors estimate the transmitted powers of the licensed users in real-time and make shutdown decisions, without requiring feedback from the incumbent. In the second, the beacons transmit control signals to licensed users directly based on the incumbent‚Äôs feedback (such as approximate position, interference level etc.,). The licensed users then make shutdown decisions according to a protocol (based on the received beacon signal strength, distance and their own transmit power). The two methods are compared with a genie-aided benchmark that is optimal.