What is the size of SIB1 in LTE

Question

It may be an easy question but still I have some doubt.
How RRC Connection setup procedure gets impacted with the presence of "S-TMSI" as an UE-Identity within the RRC Connection Request message ?
Note: RRC Connection request message can carry either 5 bytes long (S-TMSI) or 5 bytes long random value.

Answer 1

SIB 1 message size is not fixed. You can include lists, particularly the scheduling info list which indicates when the other SIBs are coming and how they might be combined. (Guaranteed to be a multiple of 8 bits coming out of the RRC due to the ASN.1 standard)

Also note that period of SIB1 is 80 ms.