Dear @VIDYA AL MAHMUD, 
thank you for sharing your situation with us in the community. 
as for your question please follow the link below- as a similar question has been answered in the past: 
https://***.wefugees.de/801654/married-wife-until-apply-permanent-residence-permit-germany
In your particular situation if are still working you should first apply first for an Aufenthaltserlaubnis and once you have that you can apply for a permanent residency. 
If you already have an Aufenthaltstitel then you can already apply and it should be granted. Do you have the Master Degree from Germany? 
I hope this can guide you if you still need more clearifications please let us know. 
Best regards, 
Nilab