Apparatus and Method for Efficiently Managing Power-up Timer for High-Speed Inter-RAT Handover in Mobile Communication Device

摘要

A method of an Inter-RAT handover between a WCDMA service and a CDMA service of a mobile communication device having a WCDMA modem and a CDMA modem, the method including: performing the WCDMA service in a WCDMA network; move from the WCDMA network to a CDMA network; determining an Inter-RAT idle roaming to the CDMA network; measuring, with a timer, a count period from a cut-off time of the WCDMA service according to the determination of the Inter-RAT idle roaming; and performing CDMA service registration according to the Inter-RAT idle roaming immediately after the cut-off time of the WCDMA service or after the count period set in the timer.