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Which the diference in rx lev sub versus rx lev full?
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.
Because of DTX
yes, when using the DTX some measurements might not be valid (because rx timeslots are empty).
The SACCH blocks are always transmitted, therefore it is a good way to ensure valid measurements of RXLEV & RXQUAL even when DTX is activated.
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