5G • 5G-Advanced (Rel-18)
HST Multi-TRP Coordination
High-Speed Train Multi-TRP Doppler & Handover Architecture
Tracks high-speed trains travelling at 350-500 km/h across trackside distributed antennas, applying pre-compensation to cancel massive Doppler shifts.
Technical Explanation
Bullet trains crossing dense cell borders generate extreme Doppler shifts and frequent handovers that overwhelm standard radios. Rel-18 HST Multi-TRP standardizes a cell-free topology along railway tracks where adjacent trackside TRPs share the same physical cell ID, coordinating transmission to pre-compensate Doppler shifts based on train speed and position.
Key Functions
- Eliminates cellular handovers along high-speed rail corridors using Shared-Cell IDs
- Pre-compensates severe Doppler shifts at vehicle speeds up to 500 km/h
- Maintains continuous 5G gigabit connectivity for train passengers and control systems
- Coordinates multi-TRP coherent beam handoffs smoothly along linear track tracks
Specifications
3GPP TR 38.859, TS 38.300 (Rel-18)
Interfaces
UuFronthaul
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