Frequent 3G to 2G Cell Reselection

Hello
Frequent cell Reselection happens from 3G to 2G , what are the probable causes?

Check RSCP and EcNo value of 3G cells

Which values are you using in 3G? SsearchRAT and qqualmin?

Also in 2G: FDDQMin, FDDRSCPMin?

Generally good values are:
SSearchRAT=1 (2dB)
Qqualmin=-18

FDDQMin=4 (-16dB)
FDDQMinOffset=0
FDDRSCPMin=0 (-114 dBm)
QP=7
QI=7

Using this values above the UE will go to 2G when RSRP <=-16dB (2dB-18dB)

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