From 12 months onward..Yes you can transfer with NOC
If you exit from Qatar for Good or your work visa is cancelled..you can come back after two years even without NOC from your previous employer..but insure that your Qatar ID No.is not lost, your Qatar ID no. will be your Qatar ID No. when you come back to Qatar..Your police Clearance in Qatar will get error due to duplicate of your finger print..there is no problem at all except to clarify why finger print is duplicated.
From 12 months onward..Yes you can transfer with NOC
If you exit from Qatar for Good or your work visa is cancelled..you can come back after two years even without NOC from your previous employer..but insure that your Qatar ID No.is not lost, your Qatar ID no. will be your Qatar ID No. when you come back to Qatar..Your police Clearance in Qatar will get error due to duplicate of your finger print..there is no problem at all except to clarify why finger print is duplicated.