Next generation non-geostationary orbit (non-GSO) satellite systems that can provide broadband to the end user will be a central issue to the work of the ITU Radiocommunication Sector (ITU-R) for the next World Radiocommunication Conference of 2019 (WRC-19). The possibility of improving spectrum efficiency and facilitating the implementation of broadband services in neglected and underserved regions brings with it the need to facilitate more efficient spectrum sharing between next generation non-GSO satellite systems in frequency bands of fixed-satellite service (FSS), while protecting other services.