5G • RAN
PSS
Primary Synchronization Signal
First physical layer signal detected during 5G cell search, providing subframe timing and cell ID factor N_ID_2 (0, 1, or 2).
Technical Explanation
The PSS is an m-sequence of length 127 mapped onto 127 active subcarriers within symbol 0 of the SS/PBCH block (SSB). It defines physical cell identity factor N_ID_2 in {0, 1, 2}. Detecting PSS enables the UE to obtain slot boundary timing, coarse frequency offset estimation, and initial radio frame synchronization.
Key Functions
- Provides coarse symbol and subframe timing synchronization
- Identifies physical cell ID factor N_ID_2 (0, 1, or 2)
- Enables initial frequency offset estimation during cell search
Specifications
3GPP TS 38.211, TS 38.213
Interfaces
Uu
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