3GPP and finding the right docs is always challenging and time consuming :-). But once you know the doc number it is well managed and organized to download it:
I assume you looking for R13 information? The following TS may be interestingTS36.331
However I have no clue at what power levels the MIBs and SIBs are broadcasted. (afaik you need to sync and collect some info before you can send out the RRC Connection Setup Request)
Maybe somebody else here has more radio experience and knows?