Sorry I made a mistake
the question concern cell “RESELECTION” not “Selection”
And I think that the answer is that
it is “CPICH RSCP” that is take into account for doing CELL RESELECTION not CPICH Ec/No
I think CPICH Ec/No can be used as
there is not so much ulilization of 3G Network. so EcNo is ok for that network. if u have high ulilization in ur netwrok then go for CPICH RSCP as in this case EcNo will be poor.