Portal Usage Analysis with SAP BW

Hello there

Currently I'm searching a method to analyze portal users behavior with SAP BW. What I want to know things like these:

Hits on I-Views/sites per user

user logon-time, logoff-time, online-time,

which I-views where visited

etc...

At the moment I considered two methods:

First I read a lot about a BW integrated feature named tealeaf. But I don't know if this works with EP6.

Second I considered if there are any logfiles created by the portal- or web- server that could provide me with the needed information.

I also thought about the portal activity report, but this information is not suitable in my case, because it is more application-based than on a users activity.

If anybody got an idea I would be very thankful.

Greets Sven