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ok, now you are talking about power control.
the class 4 says that the MAX power of the ms = 33dBm.
If the MS is very near the antenna, its power can be decreased down to 5 or 6dBm only !
But if the MS goes further away, the power will then increase : 10dBm, 12 dBm, …. up to … 33dBm.

You are right, the power is reduced when the BTS receives an execllent signal from the MS (good BER) – gradually.
But if the signal is too bad (bad BER), then the BTS asks the MS to increase its tx power – gradually, again.

The MS Tx power varies between 5dBm up to 33dBm.