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I don't think this is possible to upgrade from 11.1 to 11.2 without downtime even with RAC.
But you can reduce a lot downtime with transient logical standby or Golden Gate: please read http://docs.oracle.com/cd/E11882_01/server.112/e10803/schedule_outage.htm#i1006387.
You can also try to use Streams instead of Golden Gate because Streams features are included in Entreprise Edition whereas Golden Gate is a separate product requiring additional licenses.
About Streams usage please read http://docs.oracle.com/cd/E11882_01/server.112/e17069/ap_strmnt.htm#STRMS165.
Edited by: P. Forstmann on 12 nov. 2012 18:57