Solve GSM SD/TCH Drop?

Hello dears,
Any parameter suggestion to solve GSM SD/TCH Drop in HO?
Vendor is Huawei.
No blocking.

Normally major SD drop causes are due to CONN Fail & ERR IND (T200 Expired).

Should I increase it?

Check if cells on B site are with cell barred.
With cell barred UE can perform handover.
TEMS usually can override the barring, I think that’s why you can see all cell parameters.

SDCCH Drop due to ERR IND Received (T200 Expired)
Check Above related parameters in pictures that affect SDCCH call drop rate due to T200 expiry