C-DReAM ISL LEO template provides a  NGSO (Non-Geostationary Satellite Orbit) satellite constellation simulation capability with Inter-Satellite Links and gateway. The template is implemented by the C-DReAM simulator, which is a link budget / capacity level system simulator.
Essential pre-conditions
C-DReAM is a link budget / capacity level system simulator, i.e. we cannot observe e.g. packet-level statistics, such as delay or jitter.
Traffic is modeled by means of traffic demand in kbps, which is aimed to be offered to the user, either in uplink or downlink.
Focus is on user link (i.e. link between user terminals and satellite), in both uplink and downlink which have proper NTN channel model calculations. The feeder link and ISL have simplified channel models. Defaul minimum elevation angle of 14°.
Configurable NGSO satellite constellation, i.e. number of satellite, orbit, altitude are configurable. Inclination is 60°.
ISL routing is shortest path
Feederlink have 15 degree minimimum elevation angle requirement. Five gateways in Abu Dhabi, OSLO, San Paolo, San Francisco, Sydney.
Bessel (TR 38.821) based beam patterns with quasi-Earth-fixed (QEF) with 50 km diameter cell pattern on the ground. 30 dBi Tx and Rx STA antenna gain and 2 m antenna diameter. 34 dBW EIRP / MHz transmission power.
S-band (2 GHz) frequency reuse 1 system with configurable system bandwidth and PRB bandwidth. 23 dBm total transmission power, no power control (full power used).
Stationary user terminals. The terminals are positioned in randomized positions with configurable geographical limitations (e.g. continent and country), by default in the USA.
Terminals have omnidirectional antenna with 0 dBi antenna gain
Traffic demand per UE is between 2 to 5 Mbps with uniform distribution.
Shannon based SINR to throughput mapping matching 5G NR-NTN waveform performance.
Simple fair reference resource management algorithm, i.e. scheduler.