i don’t have this document with me now, but it seems like there is a big missing part. The explanation of the cell selection is rather large, isn’t it ?
What you could understand from this sentence is hat the MS will start decoding channels randomly, until it finds a BCCH channel. Once a BCCH is found.. the MS shall select it as “serving”.
If another BCCH from SI5 msg is heard with better signal (C2(n) > C2(s) ) then, a relection will occur.