I just want to say THANK YOU VERY MUCH!
I faced the problem described below (low TBF_est_successful_rate_UL for all cells in BSC, when in DL everything was OK). During 4 days for 6 BSCs enormous GPRS KPI degradation was detected (all BSCs had same symptoms). We performed all usual manipulations, but – in vain (also reset GPUs, even changing them).
We were ready to initiate FaultReport to our TAC, but then I’ve decided to find something in erlang.com…
… After deactivating PC for GPRS (set ALPHA to 0 and GAMMA to 0) our problem was solved!!!!