UE searches in all centre frequencies
Primary synchronization Signal(PSS)
- achieve subframe, slot and symbol synchronisation in the time domain
- identify the center of the channel bandwidth in the frequency domain
- Physical Layer ID (N2CellID)
PSS is Zadoff-Chu sequence which is CAZAC.
Transmitted on last symbol of slot 0 and 10 for FDD, third symbol of slots 2 and 12 for TDD.
Secondary Synchronization signal(SSS)
- gives cell ID group(N1CellID)
- frame timing
- CP length
SSS is constructed using two interleaved maximum length sequences.
Transmitted on second last symbol of slot 0 and 10 in FDD, last symbol of slots 1 and 11 in TDD.