name: PSS
full_form: Primary Synchronisation Signal
context: The mobile phones synchronise to the mobile network by "listening" to the Primary and Secondary Synchronization Signals (PSS and SSS), shown in respectively blue and orange on the figure below (note that the figure shows an "NR-" prefix which is omitted in the text). The vertical separations are the Ressource Blocks (RB), as defined in the previous section, i.e. a group of 12 subcarriers. The horizontal separations are the OFDM symbols. Four OFDM symbols together with 20 RBs form a so-called "SS/PBCH (Synchronization Signals/ Physical Broadcast Channel) block". Figure 5.5.4.3-1: a SS/PBCH block The PSS and NSS are transmitted over 127 subcarriers, i.e. about 10.5 RBs. (They are designed to carry the Physical Cell ID (PCID) selected from 1008 candidates.) Once synchronised with the PSS and NSS, the mobiles can retrieve the full SS/PBCH structure, and thus "listen" to the Physical Broadcast Channel (PBCH) and its associated Demodulation reference signals (DM-RS). The PBCH carries only
description: The Primary Synchronisation Signal (PSS) is a critical signal in the mobile network that enables mobile phones to synchronize with the network. It is transmitted over 127 subcarriers and is designed to carry the Physical Cell ID (PCID) selected from 1008 candidates.
explanation: The text describes PSS as being transmitted over subcarriers and carrying information (Physical Cell ID), which are characteristics of a signal.
section_title: 5.5.4.3	Initial access and mobility
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