5G • RAN
CSI-RS for Tracking (TRS)
Tracking Reference Signal Resource Set
Burst of non-zero-power CSI-RS resources configured over 2 consecutive slots for fine time/frequency drift tracking.
Technical Explanation
A TRS is a non-zero-power CSI-RS resource set configured over 2 consecutive slots, with 2 symbols per slot. The UE compares phase and timing across the symbols to compute subcarrier frequency offset and Doppler spread, maintaining synchronization between data bursts.
Key Functions
- Configured across 2 consecutive slots (2 symbols per slot) periodically
- Measures fine Doppler shift, carrier frequency drift, and delay spread
- Maintains receiver phase lock for high-order 256QAM demodulation
Specifications
3GPP TS 38.214
Interfaces
Uu
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