ENB prepares neighbour list that nrt can have neighbours as black/white list cell. ENB provides black,white list cell info to UE through rrc reconfiguration . If UE receives any black list cell in rrc reconfiguration then it UE will not consider that cell PCI for HO measurement.
IDLE mode UE gets black cell info from sib4/sib5. UE will not consider black cell for cell reselection.