A method of performing a periodic public land mobile network (PLMN) search
for a mobile station in a CELL_PCH state of radio resource control (RRC)
connected mode in a universal mobile telecommunications system (UMTS) is
described. The method includes providing a mobile station operating in
the CELL_PCH state camping on a serving cell of a PLMN utilizing a first
PLMN identity; performing a periodic PLMN search with the mobile station
and selecting a cell with a second PLMN identity, the second PLMN
identity having a higher network priority than the first PLMN identity;
and performing a CELL UPDATE procedure to register the mobile station
with the selected cell utilizing the second PLMN identity if the serving
cell and the selected cell are each associated with a common PLMN
identity.