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When you power on 5G/NR UE(NR Standalone UE) or When LTE is adding NR Cell as a secondary cell, the first thing happening in UE is the process described below. This summary is based on Matlab 5G Toolbox example (Ref [1]) and the implementation on UE may vary a little bit from this.
i) Search Frequency in which SSB (PSS + SCC + PBCH) is transmitted. ii) Search PSS ==> By detecting PSS, UE can figure out iii) Construct the resource grid from the received signal and the detected timing from step ii) iv) Search SSS by correlating the extracted SSS REs and calculating the correlation between the extracted SSS and Reference SSS ==> By detecting SSS, UE can figure out v) From v) Search PBCH DMRS ==> from PBCH DMRS UE can vi) (based on Channel and Noise estimation) Perform Equalization(MMSE) for PBCH extraction ==> Once this equalization is done properly, UE can vii) Demodulate PBCH ==> figure out PBCH bits viii) Decode PBCH ==> Figure out MIB
Reference[1] NR Synchronization Procedures (Matlab 5G Toolbox)
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