● Real‑time simulation
Scenario C2 · LEO 600 Transparent
🛰️ Satellite X: 0.0 km Y: 0.0 km
⏱️ Altitude 600 km
⚡ Speed 7.56 km/s
📡 Beam Moving
Round Trip Delay (RTD)25.8 ms
Max Doppler shift±24.0 ppm
Beam footprint (diameter)90 km
Orbit altitude600 km
NG‑RAN architecture
gNB on ground
UE
NR‑Uu
Satellite
payload
NTN GW
SRI
gNB
on ground
Service link active · RTD 25.8 ms
moving beam
drag UE on map to adjust position
🎯 Learning Outcome: By moving the UE within the beam, you observe how RTD changes based on the UE‑satellite distance.
The Doppler shift is maximum at the beam edge and minimum at the center.
Compare scenarios to understand the trade‑offs between GEO latency and LEO mobility/Doppler.
⚙️ Calculations based on 3GPP TR 38.821 · RTD = 2× (distance/c) · Doppler = (v/c)×fc