thanks for your reply, as allways. Before adding sdcch in the cell 2 and 3, the drop was around 0.60%, after over 5% (about 70-80 drops per hour). Interesting is that sdcch_assignment_failure decreased and sdcch_drop increased at the moment of adding extra sdcch. Of course,we tried to reset corresponding TRX and TCU, still the same. Today we removed extra sdcch at the end of the day, will see tomorow the results. I’ll inform you tomorow about that. Counter type 7 is not activated, and cannot see the LapD congestion.