pbcch means that there is a specific timeslot which is configured to broadcast the PSI.
In other words, there is BCCH on TS0 and PBCCH on TS2 for example.
Unfortunately, there is no MS in the world that supports this feature. So it is never used. The PSI are transmitted to the MS in PTM through their PACCH. (Packet Transer Mode)
So you might as well forget about PBCCH, as I believe it is now deprecated in 3GPP.