EHP 7 / NW7.4 Upgarde prerequsites

Hi Experts ,

We are planning  to upgrade from ERP 6 EHP6 / NW 7.31 ( on AIX 6.1 and Oracle 11.2.0.3)  to  EHP 7 / NW 7.4 EHP, just want to know the upgrade prerequisites in terms of AIX and Oracle Database including oracle  patch/ AIX TL levels .

Any information will be appreciated

Thanks

Al Mamun