Hey ,
you are confusing between what ts0 is and what i have mentioned , the time slots are mapped into the multiframe structure that both the MS and the BTS understand.You have to go to the frame structure of GSM to understand this better.
Obviously we will have sets of channels for BCCH and TCH the BCCH should not be in Hopping.
These are steps that are called related to RF Desigh based on these results you will choose the number and the location of the sites to be planned then we do the survey and go forward in this /