RA-RNTI preamble

hello everyone,
After the gNB transmit MIB and SIB1 the UE a transmitter RA-RNTI preamble message,
for this the ue need a number of parmeter.

The parameters are detailed in the picture:

How the UE Know the parameters?
This parameters include in the SIB1? or MIB?


RACH related parameters are in SIB1

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Thank you,
you know where i can find the parmaters?
The intention is to find the details of the parameters.