An Optimized Move List for Dynamic Protection Area in CBRS

Abstract

In Citizen Broadband Radio Service (CBRS), upon the activation of a Dynamic Protection Area (DPA), a subset of CBRS Devices (CBSDs) from both the Priority Access License (PAL) and General Authorized Access (GAA) users must be moved to other channels or cease transmission so that the 95th percentile aggregate interference level to the incumbent Navy radars, across all directional beams, can be kept under a pre-defined interference threshold. An important performance objective is to make this CBSD move list as small as possible so that the adverse impact on the PAL and GAA users can be minimized. 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 PAL CBSDs, and the use of a small subset of DPA points to expedite computation time. Experimental results show significant improvement of OML over the state-of-the-art in its abilities to find a smaller move list and to offer priority to PAL over GAA CBSDs while meeting interference protection at all DPA points.