Fast return to LTE after USSD_ Nokia

4G LTE
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Hi experts ,

Fast return to LTE after supplementary csfb is taking more than 10 sec whereas after cs call it’s taking only 1 sec .
Smart LTE layering is enabled with all services and all triggers. Any other parameter I am missing here .

In log analysis I can see after ussd signalling end msc sending of end of csfb message but RNC not sending rrc release with redirect and after that ue continue with Rau and lac update

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set the following PRFILE paramter 002:1916 RN60_MAINT_41 to “0111"

set app-parameter configuration-parameter class 02 number 1916 value 0111