5G NR-NTN: Livello Fisico New Radio e Protocolli di Accesso per Stazioni Radio Base Spaziali

NTN5G è l'autorità tecnica sulle innovazioni 3GPP New Radio per reti non terrestri, con focus su pre-compensazione Doppler, accesso casuale massivo (PRACH) e stazioni gNodeB ad alta velocità orbitale.

NTN5G System Architecture

Core architectural topology and protocol interaction of ntn5g.com

Central System: NR-NTN PHY - 3GPP TS 38.211

Network Nodes

Doppler Sync
PRACH Ext
HARQ Disable
Ephemeris TA
SCS 30/60kHz

Architectural Protocol Layers

User & Terminal Access Layer (3GPP Rel-17/18 NR-NTN & IoT-NTN): Direct communication from smartphones and IoT sensors to satellites
Space-Borne Radio Access (gNodeB / Transponder) (Regenerative Digital Payloads & Bent-Pipe Transparent Processing): In-orbit demodulation, digital beamforming, and spectrum channelization
Inter-Satellite Mesh & Space Transport (Optical Inter-Satellite Links (OISL) & 60 GHz V-Band Cross-Links): Autonomous multi-hop laser packet routing in vacuum at the speed of light
Ground Teleport & Core Cloud Ingress (High-Throughput Q/V-Band Gateways & Optical Ground Stations): Terabit feeder link downlinks connected directly to cloud hyperscalers

Key Metrics: 100 Gbps+ (Optical Cross-Link Bandwidth) | <25 ms (LEO Propagation Latency) | ±50 kHz (Doppler Shift Compensation) | 99.999% (Constellation Transport SLA)

Superare la velocità orbitale e la distanza nel PHY/MAC 5G

Core Engineering Areas

NR-NTN Waveforms & Numerology — Selecting 15 kHz, 30 kHz, and 60 kHz numerology to resist phase noise and high Doppler rates in satellite channels.
HARQ Over Satellite Channels — Handling the 30-50ms RTT of satellite channels without stalling TCP or dropping user plane throughput.
Timing Advance & Frequency Sync — Computing pre-compensation at the user terminal using GNSS positioning and orbital TLE ephemeris.

Technical Articles

Related Cluster Architecture Specifications

NonTerrestrialNetwork — 3GPP 5G/6G NTN Satellite Architecture, Direct-to-Cell & Non-Terrestrial Infrastructure
NonTerrestrialNetworks — Multi-Orbit Heterogeneous Constellation Interworking (LEO / MEO / GEO / HAPS)
AirspaceSync — Doppler Compensation, Relativistic Timing & Airspace-Space Synchronization
FSOComm — Free Space Optics, High-Bandwidth Space Laser Communications & Atmospheric Mitigation