Patent ID: 8553616

Claim:
A method for reducing closed subscriber group (CSG) identity comparison for a mobile device of a wireless communication system, the method comprising: including radio access technology (RAT) information in an allowed CSG list, wherein the allowed CSG list comprises a plurality of CSG identities and is stored in an elementary file of the mobile device and the RAT information indicates a plurality of RATs associated with the allowed CSG list; controlling a non-access stratum (NAS) layer of the mobile device to read the allowed CSG list comprising the RAT information from the elementary file and pass the allowed CSG list comprising the RAT information to the AS layer; maintaining a plurality of sub-allowed CSG lists in the AS layer of the mobile device according to the plurality of RATs, wherein each of the plurality of sub-allowed CSG lists is corresponding to a different RAT; and comparing a CSG identity of a first cell serving a first RAT, which the mobile device performs cell selection or cell reselection with the CSG identities listed in a first sub allowed CSG list corresponding to the first RAT.