r- rier offset 0) help in initial time and frequency alignment. Content of the SSB is shown in Fig. 2-41. Key components of the SSB are: Primary Synchronization Signal (PSS)-a Zadoff-Chu sequence that is derived from a portion of the cell identity (Cell ID). The PSS signal also identifies the slot boundary. Secondary Synchronization Signal (SSS)-an m-sequence that completes the Cell ID identification. 5G NR cells are identified by one out of 1008 IDs in 336 groups of 3 sectors each. The PSS contains the sector and the SSS contains the group, allowing the cell ID to be calculated as 3 X Cell ID (SSS component) + Cell ID (PSS component). Physical Broadcast Channel (PBCH)-this carries the MIB with additional timing and identification information in 31 information bits per Fig. 2-42. Chapter 2 System components, requirements, and interfaces 89 SS Burst set periodicity (20ms) SS Block Transmission SS Burst SS Burst SS Burst SS Burst SS Burst SS Burst Burst Period Half Frame (5ms) Burst Period Half Frame (5ms) SSBlock index 0 - (L-1) per Half Frame (5ms) LSB from DM-RS sequence for SS Block MSB from PBCH bits aA+5, aA+6, SS Block Location in slot is defined by 38.213/Ch 4.1 FIGURE 2-40 SS Block transmission. Channel OFDM Symbol # Subcarrier k relative to SS/PBCH block 56, 57, 182 56, 57, 182 Set to 0 55; 183; 184, Subcarrier number Set to 0 48, 49, 55; 183; 184, 0, 1, ..., 239 ..., 47; 192, 193, DM-RS for PBCH 0 + V, 4 + V, 8 + V,..., 236 +v DM-RS for PBCH 0 + V, 4 + V, 8 + V, 44 V, 192 + V, 196 + V 236 + V OFDM Symbol v==cN ID mod 4 Offset FIGURE 2-41 SS block contents. The pdcch_ConfigSIBI IE further identifies the time/frequency resources (Control Resource Set or CORESET) that tell the client where to identify the downlink control channel (PDCCH, Fig. 2-43) that contains the signaling information that points to the System Information Block 1 (SIB1). The SIB1 contains a much larger information set, including more details on cell identi- fiers, UL/DL configuration, bandwidth partitioning, and so on, providing sufficie