ADCGuy,
Your explanation is amazing !
Awacs,
BCCH TRX is just a nickname used to describe the first TRX of a cell, which carries the BCCH on the first timeslot.
This TRX is a bit special because it always emit (even when there’s no call on it) during all timeslots, and there is no power control : it emits at full power all the time.
Regards,
Pix