C-DReAM: Satellite Constellation Simulator

System-Level Simulation & Digital Twins for SatCom Systems

C-DReAM is a modular system-level simulator for analyzing, optimizing, and designing satellite constellations, non-terrestrial networks (NTN), and 5G TN/NTN systems.

Designed for NGSO and GSO systems alike, C-DReAM provides high-accuracy modeling across link budgets, beam coverage, user traffic demand, routing, interference, coexistence, and more.

Trusted by SatCom innovators, operators, vendors & research organizations, C-DReAM enables end-to-end exploration of constellation behavior, network performance, and next-generation TN/NTN architectures using high-fidelity simulation.

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Comprehensive System-Level SatCom Simulation

Simulate orbital motion, beam behavior, link budgets, interference, and traffic in a high-accuracy environment supporting small to mega-sized LEO, MEO & GEO systems.

Built for 5G NR-NTN & TN/NTN Architectures

Evaluate 5G NR-NTN performance with modules aligned with 3GPP specifications – including NR-NTN, IoT-NTN, and hybrid TN/NTN scenarios.

Modular & Extensible to Diverse SatCom Needs

Customize RRM algorithms, payload models, air interfaces, and beam configurations to support a wide range of constellation deployments and research scenarios.

Advanced SatCom & 5G TN/NTN Modeling Capabilities

Model Constellation Behavior

Simulate LEO, MEO & GEO constellation behavior with realistic orbital dynamics
Explore multi-constellation scenarios
Evaluate beam placement & constellation coverage
Conduct thermal, radiation & energy analyses assisted with orbit simulations
Assess hyperspectral camera & SAR constellations
Run scenario comparisons to understand how design choices affect global performance & coverage

Analyze Performance & Capacity

Evaluate link performance, downlink/uplink spectral efficiency, and routing
Compare capacity under different satellite counts, traffic profiles, and network assumptions
Calculate SNR/SINR
Analyze 5G TN/NTN coexistence and interference
Explore Inter-Satellite Links
Identify performance bottlenecks and issues early to improve system resilience

Optimize Network & User Experience

Examine gateway placement, RRM strategies, and scheduling impacts
Understand UT behavior across environments, mobility patterns, and channel conditions
Analyze how system-level design choices influence end-user performance
Evaluate network performance under varying traffic demand
Test optimization strategies for improving service availability in challenging regions

Evaluate Results & Visualize Outcomes

Review constellation dynamics, beams, and connectivity states through visual playback
Interpret system KPIs, user-level metrics, capacity, and interference
Use trace file and visual artifacts to support decision-making and communication
Present simulation insights to stakeholders through visualizations for clearer understanding and analysis

Verified in ESA & SatCom Industry Projects

C‑DReAM was originally developed within a European Space Agency project in collaboration with Thales Alenia Space France, where its core architecture and RRM capabilities were established. Development continued in the DASCE project, evolving the simulator toward supporting 5G NTN direct-access use cases. Today, C-DReAM continues to advance as we expand its performance, modules, and accuracy for next-generation TN/NTN and SatCom systems.

See how C-DReAM Powers Real Innovation in SatCom

Optimizing Sateliot’s 5G NB-IoT LEO Constellation Design

Sateliot satellite orbiting Earth

Sateliot, a leading satellite telecommunications 5G IoT operator, is using C-DReAM and Magister SimLab to develop and optimize its 5G NB-IoT LEO constellation, enhancing global IoT connectivity and enabling accurate modeling of critical real-world scenarios.

Comparing DVB-S2X/RCS2 and 5G NR-NTN Performance for Forsway

Advancing SatCom Connectivity for UAV Terminals

Exploring 5G-Advanced & 6G NTN Technologies in the EAGER Project

Why C-DReAM?

C-DReAM provides end-to-end visibility into satellite constellation behavior – combining beam patterns, link budgets, routing, and interference analysis into one simulation environment. It offers:

Detailed System Modeling

Simulates orbital movement, antenna patterns, propagation effects, and link performance with accuracy appropriate for system‑level studies.

Complete modularity

Choose the modules you need and combine them for full-system digital twins.

Alignment with 3GPP methodologies

Supports parameter mappings following 3GPP TR 38.821‑type assumptions, enabling NTN system‑level studies.

Proven in ESA and SatCom R&D projects

Validated through research & innovation work on NGSO, 5G NR-NTN, UAV SatCom, NB-IoT, and coexistence analysis.