NTNSpace: 우주 재생형 5G gNodeB 탑재체 및 우주 세그먼트 설계

NTNSpace Regenerative gNodeB Spacecraft Payload Architecture

Complete on-orbit 3GPP Release 17 DU/CU baseband stack executing on radiation-hardened FPGAs

Central System: Active Multi-Beam RF Front-End - Cryo-cooled low noise amplifiers and digital beamformers

Network Nodes

• Active Multi-Beam RF Front-End
• Radiation-Tolerant Baseband FPGA
• Containerized O-DU / O-CU Engine
• Terabit Optical Crosslink Router

Architectural Protocol Layers

• Spaceborne PHY/MAC Layer (3GPP Rel-17 TS 38.300): Doppler compensation, HARQ disabling, and timing advance extension.
• Orbital Mesh Routing (CCSDS / Delay-Tolerant Networking): Dynamic topology routing over intermittent laser crosslinks.
• Regenerative Core Processing (OpenRAN / 3GPP CU-DU Split): Onboard user plane function (UPF) local breakout.

Key Metrics: < 18ms (LEO Orbit-to-Ground Roundtrip) | 100 Gbps (Optical Crosslink Throughput) | ±48 kHz (Doppler Shift Compensation) | 99.999% (Orbital Constellation Availability)