We set parameters in EnodeB at EutrancellFDD level and at utranfrequencyrelation level (i.e. relation of LTE cell with that utran frequency)
Some parameters which control this cell reselection to UMTS are :-
cellReselectionPriority
connectedModeMobilityPrio
csFallbackPrio
csFallbackPrioEC
pMaxUtra
qQualMin
qRxLevMin
threshXHigh
threshXLow
Thanks & Regards.