Oracle Upgrade 10.2 to 11.2 in HP Unix

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Dear Expert,

We are planning to upgrade our Oracle from 10.2 to 11.2 . This is a totally new activity for me.

I have completed the most of pre-requisite as per downloaded also GUIDE_UX_ORA_UPGR_112_400 from SMP.

Reading this guide; get few doubts and query:-

Is it required install oracle client ?

And are there any utility to use for upgrade client and how to use?

System Details:-

SAP Version - SAP ECC 6.0 EHP 4

Oracle DB - 10.2.0.5.0

OS- HP UNIX 11.31

Kernel Release 721 - patch level 201

Download the software:-

51042930 - ORACLE Client 11.2.0.2

51047693_1 to 8 - Oracle 11.2.0.4 RDBMS HP-UX on IA64 64bit 1/8

Please guide

Regards,

Ajay