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3GPP started establishing 5G NR standards in 2016, and standard documents up to Rel.17 were finalized.
Among the 5G NR standards, TS 38.331, an RRC (Radio Resource Control) protocol standard, describes contents related to radio access between a UE and a BS.
The step of initial access to the BS includes a process of receiving system information blocks such as MIB (Master Information Block), SIB1 (System Information Block1), and SIB2 (System Information Block2) after DL (Downlink) sync through SSB (Synchronization Signal Block).
Here, MIB and SIB1 are transmitted as one message through the PBCH (Physical Broadcast Channel) and PDSCH (Physical Downlink Shared Channel), respectively, and SIB2 is included in a message called SI (System Information) and transmitted through the PDSCH.
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IEEE/ICACT20230137 Slide.03
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