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This slide shows a flow chart for LTE-based initial access implemented in the existing ns-3 project, 5g lena.
When the UE starts cell search, it first waits for MIB and SIB1 message reception.
The UE must receive the MIB message to receive the SIB1 message, and then the UE can stay in the cell normally.
Afterwards, the UE receives SIB2 including RACH information for RRC access, goes through the RANDOM ACCESS process, attempts RRC connection, and if the network accepts it, RRC connection is established
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