rxlev FULL is the rxlev measured on all 4×26 timeslots of your TCH in the 4×26 multiframe (= 480ms)
rxlev SUB is the rxlev measured on the unique SACCH block of each of the four 26 multiframe (=480ms). So 4 blocks measured per 480 ms.
Reply To: Rx lev Sub -Rx lev full