What is the next thing to check if all call drops are in counter VS.RAB.AbnormRel.PS.BE?

Can anyone let me know if all the PS drops are in counter VS.RAB.AbnormRel.PS.BE then what is the next step for checking?

hello !!! what is reason of increment VS.RAB.AbnormRel.PS.BE in huawei 3G cells?

Kindly need your support to know if all the PS drops are in counter VS.RAB.AbnormRel.PS.BE are high then what is the main reason and what to check? Thanks a lot.