AIC counters are counted per Atermux nibble, or A-interface timeslot
–> not per Atermux “timeslot”
There are some counters, such as C181 or C18x… that are counting messages sent or received by the BSC on the A interface. Thanks to them, you are able to investigate a problem on A interface. But they are not counted per Atermux nibble. They are counted per cell.
Regarding C181 precisely, could you check its properties ? Check the “trigger”. that will tell you which message is actually counted. Then go to the 3GPP 44.xxx and find in which situation this message is sent/received on A interface.
This is the way to do it… Can’t do it for you because I’m not in the office right now…