Method and apparatus for efficiently managing power-up timer for high-speed inter-radio access technology handover in mobile communication device

Abstract

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.

Description

technical field [0001] The present invention relates to a roaming method of a mobile communication device, in particular to a high-speed radio access technology (RAT, RadioAccess Technology) Code Division Multiple Access (CDMA) handover method and device, wherein the mobile communication system may be a Wideband Code Division Multiple Access (WCDMA) system and a Global Standard for Mobile Communications (GSM) system. Background technique [0002] In the current society, many people use communication devices as remote communication devices. In particular, for mobile communication devices, no matter where the user is, the device can provide functions to facilitate communication when the user moves, and therefore, the application of mobile communication devices is generally considered to be necessary. [0003] Since current mobile communication devices have powerful processors and enhanced memory resources, various functions in different fields are currently provided in additi...

AI Technical Summary

Problems solved by technology

For example, when a mobile communication device uses WCDMA data service and moves to a CDMA service area, the WCDMA data service cannot be used while the T57m timer is working. In addition, due to the end of the application service that times out before T57m, if the CDMA service is not executed The rapid switching, service continuity will not be guaranteed

[0011] Also, when roaming has to be performed to switch from WCDMA service to CDMA service, the pilot signal of the WCDMA system is too low to maintain the WCDMA service

In this case, since the success rate of reception or transmission will decrease, continuous mobile communication service cannot be provided to the user if the registration process with respect to the CDMA service is not performed quickly

[0012] In addition, since the registration processing for roaming operation is not defined in the current CDMA standard, processing such as power-on and registration must be performed, and thus there will be a delay in the registration processing ending due to the actual execution of these processing

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