In case of RH:
BCCH TRE is always emitting at full power. So BS TXPWR always = Max. But MS TXPWR can be decreased (thx to UL PC).
In case of BBH:
the MS doesn’t hop between different TRX : each TS will hop onto different frequencies. This is called “synthetized” BBH 🙂 it’s alcatel-lucent solution.
therefore, in bbh, even the bcch trx will lower its power, during the TDMA frames emitted onto non-BCCH frequencies.