An Optimized Move List for DPA in CBRS

In Citizen Broadband Radio Service (CBRS) band, upon the activation of a Dynamic Protection Area (DPA) on a channel, a subset of CBRS Devices (called CBSDs) from both the Priority Access License (PAL) and General Authorized Access (GAA) users must cease transmission so that the 95th percentile aggregate interference level at the incumbent Navy radars, across all directional beams, can be kept under a predefined interference threshold. This subset of CBSDs constitutes a “move list” and a key objective is to minimize this move list (and thus minimizing the adverse impact on the PAL and GAA users). We find that move lists obtained by the state-of-the-art algorithms tend to be unnecessarily large due to their designs; nor can they offer the required differentiated service between the PAL and GAA users. This paper presents an optimization-based algorithm (called OML) to find the minimum move list. The essence of OML encompasses holistic considerations of all DPA points and all beam directions simultaneously in its formulation, a two-stage optimization process with a priority to the PAL CBSDs, and the use of a small subset of DPA points to expedite computation time. Simulation results show a significant improvement of OML over the state-of-the-art in its ability to find a smaller move list and to offer priority to PAL over GAA CBSDs while meeting interference protection at all DPA points.