Initial Synchronization
Following steps are performed during Initial Synchronisation: 1) Reading SSB block (PSS, SSS & MIB ). Determining PCI, Sub Frame number, SFN etc. 2) Reading SIB1 and finding RACH/PRACH information 3) RACH transmission and RAR reception. STEP 1: SSB Reading Synchronisation Block: SSB block takes 20 RBs . It is transmitted over 4 symbols. Default periodicity is 20 ms. in one slot, maximum 2 SBs can be transmitted. Multiple SBs are transmitted as each SB corresponds to each beam. Maximum number of SB blocks varies depending on the frequency range. For Freq < 3 GHz, Max SB Blocks = 4, For 3< Freq < 6 GHz, Max SB Blocks = 8 For Freq > 6 GHz, Max SB Blocks = 64 SSB block contains following signals PSS (Primary synchronisation signal) SSS (Secondary Synchronisation Signal) PBCH DMRS + PBCH (MIB) PSS and SSS together is used to determine the physical cell ID which is 0-1008. PBCH DMRS provides SSB index as it is gener...