Hi Krishna.
1. You have to refer the SAP installation guide on AIX with Oracle DB and some of the SAP reference notes. Refer the SAP installation guide - Select the OS / DB & SAP version
1972803 - SAP on AIX: Recommendations
1522360 - FAQ for SAP HA installations using PowerHA (HACMP)
2. If it not possible you have to take the SAP or SAP Authorized consultant services to implement or upgrade the existing SAP system to AIX.
Regards
SS