  This paper introduces ASCENT (context Aware Spectrum Coexistence Design and
Implementation) toolset, an advanced context-aware terrestrial satellite
spectrum sharing toolset designed for researchers, policymakers, and
regulators. It serves two essential purposes (a) evaluating the potential for
harmful interference to primary users in satellite bands and (b) facilitating
the analysis, design, and implementation of diverse regulatory policies on
spectrum usage and sharing. Notably, ASCENT implements a closed-loop feedback
system that allows dynamic adaptation of policies according to a wide range of
contextual factors (e.g., weather, buildings, summer/winter foliage, etc.) and
feedback on the impact of these policies through realistic simulation.
Specifically, ASCENT comprises the following components (i) interference
evaluation tool for evaluating interference at the incumbents in a
spectrum-sharing environment while taking the underlying contexts, (ii) dynamic
spectrum access (DSA) framework for providing context-aware instructions to
adapt networking parameters and control secondary terrestrial network's access
to the shared spectrum band according to context aware prioritization, (iii)
Context broker to acquire essential and relevant contexts from external context
information providers; and (iv) DSA Database to store dynamic and static
contexts and the regulator's policy information. The closed-loop feedback
system of ASCENT is implemented by integrating these components in a modular
software architecture. A case study of sharing the lower 12 GHz Ku band
(12.2-12.7 GHz) with the 5G terrestrial cellular network is considered, and the
usability of ASCENT is demonstrated by dynamically changing exclusion zone's
radius in different weather conditions.
