5G • RAN
PRACH Format 2
Long Preamble Format 2
Long preamble format spanning 4 subframes with repeated sequence and extended CP for cell radius up to 30 km.
Technical Explanation
PRACH Format 2 spans 4 subframes (4 ms), featuring a cyclic prefix of 4688 Ts followed by two repeated 839-length Zadoff-Chu sequences. The repetition provides 3 dB energy gain for superior detection sensitivity in noisy rural macro environments.
Key Functions
- Offers high detection sensitivity via sequence repetition
- Covers cell radii up to approximately 30 km
- Maintains 1.25 kHz SCS across 6 PRBs
Specifications
3GPP TS 38.211
Interfaces
Uu
Related 5G Concepts
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