LTE & LTE Advanced

6Downlink Physical Signals

6.1. PSS physical signal

The Primary Synchronization Signal (PSS) performs the following functions:

• – frequency synchronization;
• – time synchronization, at the level of the Orthogonal Frequency Division Multiplexing (OFDM) symbol, of the time slot, of the subframe (1 ms periodicity) and of the half-frame (5 ms periodicity);
• – value determination for the number .

The number for the Physical-layer Cell Identity (PCI) equals

represents the group number and can take values ranging from 0 to 167. It is determined by the Secondary Synchronization Signal (SSS).

represents the number in the group and can take values ranging from 0 to 2.

6.1.1. Sequence generation

The PSS physical signal is generated from a 62-symbol Zadoff-Chu sequence d(n) corresponding to the following equations:

where u represents the root index, it being possible for u to adopt the three ...