Why SRVCC HO Trigger before A2 Threshold?

In a network RSRP higher than INTERRATA2THD. Why RRC_CONN_REESTAB_REQ as HO Command received and cause HO fail. In parameter setting UE should not measure UTRAN but still measuring UTRAN instead of GERAN.

From trace SRVCC trigger before A2 threshold, as no detail L3 msg at S1AP_HO_REQ. Note only SRVCC enable for GERAN CS service not both CS+PS.
No para issue found. Why A2 trigger before the threshold… Thanks!

Decrease SRVCC threshold { InterRatHoA2ThdRsrp & InterRatHoGeranB1Thd t } to trigger early SRVCC

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