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The paradigm of shared spectrum allows secondary devices to opportunisticallyaccess spectrum bands underutilized by primary owners. Recently, the FCC hastargeted the sharing of the 3.5 GHz (3550-3700 MHz) federal spectrum withcommercial systems such as small cells. The rules require a Spectrum AccessSystem (SAS) to accommodate three service tiers: 1) Incumbent Access, 2)Priority Access (PA), and 3) Generalized Authorized Access (GAA). In this work,we study the SAS-assisted dynamic channel assignment (CA) for PA and GAAtiers.We introduce the node-channel-pair conflict graph to capture pairwiseinterference, channel and geographic contiguity constraints, spatially varyingchannel availability, and coexistence awareness. The proposed conflict graphallows us to formulate PA CA and GAA CA with binary conflicts asmax-cardinality and max-reward CA, respectively. Approximate solutions can befound by a heuristic-based algorithm that search for the maximum weightedindependent set. We further formulate GAA CA with non-binary conflicts asmax-utility CA. We show that the utility function is submodular, and theproblem is an instance of matroid-constrained submodular maximization. Apolynomial-time algorithm based on local search is proposed that provides aprovable performance guarantee. Extensive simulations using a real-world Wi-Fihotspot location dataset are conducted to evaluate the proposed algorithms. Ourresults have demonstrated the advantages of the proposed graph representationand improved performance of the proposed algorithms over the baselinealgorithms.

SAS-Assisted Coexistence-Aware Dynamic Channel Assignment in CBRS Band