EGPRS Drop TBF UL NO RESPONSE

Hi experts,


Could you please share your experience with 2G GPRS/EGPRS high TBF UL drop cause "No reponse"? Reason? Suggestions?
No UL interf, no PCU overload, CDED 2TS, CDED 4TS ,Max 100%

Thanks in advance for your assistance

br//