Hi Kamaraj
If your are having new hardware you have to perform either Homogeneous system copy method with same EHP 6 version and then You can do the EHP 7 upgrade or on your exiting system do the upgrade from EHP 6 to EHP 7 and then perform the new hardware migration SAP Homogeneous system copy method.
You can't perform the Migration & upgrade together. either one of the activity take please.and also you can read the System copy & SAP upgrade guides from SAP Service Market place. or you can refer the guide based on your SAP version http://service.sap.com//guidefinder (Require SAP Support user id)
BR
SS