But UL is between the BTS and the BSC, no ? And your tool is collecting data that comes from the BSC… so it can’t be A/Ater interface.
And the TCUC board are statically allocated per cell, isn’t t-it ? So the “random” -ness of the problem is quite intriguing …
Can’t it be simply UL interference ? Did you see an increase in the number of handovers due to UL poor quality or UL high interference ?
Is it possible to give us the distribution of the UL RXQUAL per UL RXLEV bands, before and after the problem ?
Just proposing ways to anlyze the problem, can’t know for sure 🙂