C-DReAM

C-DReAM is a comprehensive system-level satellite simulator that enables the simulation of orbital motion, beam behavior, link budgets, interference, and traffic in a high-accuracy environment. It supports small to mega-sized LEO, MEO, and GEO systems. Designed for both NGSO and GSO systems, C-DReAM provides high-accuracy modeling across various aspects including link budgets, beam coverage, user traffic demand, routing, interference, and coexistence. Trusted by SatCom innovators and operators, it facilitates end-to-end exploration of constellation behavior, network performance, and next-generation TN/NTN architectures through high-fidelity simulation. The simulator allows evaluation of 5G NR-NTN performance with modules aligned with 3GPP specifications, covering NR-NTN, IoT-NTN, and hybrid TN/NTN scenarios. Users can customize RRM algorithms, payload models, air interfaces, and beam configurations to support a wide range of constellation deployments and research scenarios. C-DReAM was developed in a European Space Agency project, establishing its core architecture and RRM capabilities, with further development in the DASCE project extending it to 5G NTN direct access scenarios. Ongoing development ensures its robustness and currency for designing and evaluating advanced next-generation TN/NTN and SatCom systems. It provides end-to-end visibility into satellite constellation behavior by combining beam patterns, link budgets, routing, and interference analysis within a single simulation environment. Key features include detailed system modeling, complete modularity, alignment with 3GPP methodologies, and configurable frequency bands.