Patent ID: 9155028
Filing Date: 2015-10-06
Classification: H04W

Abstract:
1. A method in a mobile communication terminal, the method comprising: configuring a Public Land Mobile Network (PLMN) list based on at least one PLMN information stored in a Subscriber Identification Module (SIM) card, wherein the at least PLMN information include a Home Public Land Mobile Network (HPLMN) of the mobile communication terminal, a list of PLMNs and a priority for each PLMN; configuring a HPLMN timer and a scan timer based on an Elementary Files_Higher Priority PLMN (EF_HPPLMN) period stored in the SIM wherein the HPLMN timer period is longer than the scan timer period: detecting whether the mobile terminal is registered to a Visited Public Land Mobile Network (VPLMN); determining frequency information and corresponding PLMN information obtained from a previous scanning result stored in a database of the mobile communication terminal when the mobile communication terminal is registered to the VPLMN; comparing the determined frequency information and the corresponding PLMN information from the database with the PLMN list; and, performing a first scanning process when all PLMNs of the PLMN list are included in the database, wherein the first scanning process comprises periodic scanning of only frequency bandwidths included in the database for the HPLMN timer period; and performing a second scanning process for a first period of time when all PLMNs of the PLMN list; are not included in the database wherein the first period of time is longer than the HPLMN timer period and the second scanning process comprises: wherein the first sub-scanning process and the second sub-scanning process are performed until a PLMN having a higher priority than a PLMN to which the mobile communication terminal is connected is detected.