C-DReAM is a capacity-level simulator for evaluating NGSO (LEO and MEO) satellite systems. It was originally developed within European Space Agency’s C-DReAM (Constellation – Dynamic Resource Allocation Management) project and further enhanced in the Direct Access Satellite Constellation Emulator (DASCE) project.

With the C-DReAM simulator, you can study NGSO satellite constellations e.g.

• Constellation design and parameters, e.g. coverage/availability analysis
• Link budget analysis with different antenna assumptions
• Satellite system capacity evaluation with different design assumptions, such as no of satellites and terminal deployments 
• Resource allocation algorithm design, optimization, and testing.

The C-DReAM simulator is highly configurable e.g. in terms of satellites, terminals, frequencies, and link budget parameters. For example, C-DReAM can be used to evaluate 5G NR-NTN usability for NGSO satellite constellation systems.

• Satellite constellation configuration and propagation either based on TLE input files or through parameterization 
• Satellite beam configuration using TR 38.811 Bessel patterns; e.g. Quasi-Earth-Fixed (QEF) or Earth-Moving (EM) beams. 
• Handheld (omnidirectional) or directional VSAT user terminals: 
• Configurable frequency bands, e.g. S- and Ka-bands 
• Air interface (waveforms): 
  • 5G NR-NTN
  • DVB-S2x/RCS2
• Configurable bandwidths and resolution
• Various frequency reuse schemes, e.g. FRF-1 and FRF-3
• Visualization: SimLab or SimLab visualizer.

C-DReAM simulator can be used for many purposes in planning and optimizing the capacity of the satellite constellation networks. It can be configurated in various ways to simulate different scenarios.

• Satellite constellation design and/or capacity planning and optimization
• Coverage/availability and link budget analysis 
• Radio resource management algorithm development and testing
• Visual demonstrations for pre-sales support or demo purposes.