METHOD AND SYSTEM FOR SEARCHING TARGET CELL BY USING MULTIMODE-MULTIBAND TERMINAL IN MOBILE COMMUNICATION ENVIRONMENT

Disclosed is a method for searching for a target cell by using a multimode-multiband terminal in mobile communication environments, in which a mobile communication system improves a handover success rate and communication quality by reducing time required for searching for the target cell, the mobile communication system including a CDMA-2000 system and a WCDMA system, the CDMA-2000 system including a base-station transmission system and a base station controller and providing a CDMA-2000 service to a terminal requesting access, the WCDMA system including an RTS and an RNC and providing a WCDMA service to the terminal requesting the access. The method including: (a) receiving WCDMA signals transmitted from the WCDMA system through a WCDMA modem in order to measure an Ec/Io value; (b) turning on a CDMA-2000 modem according to a result of step (a) and entering an idle state; (c) monitoring a handover-target cell; (d) transmitting a handover request to the WCDMA system; (e) receiving a handover command from the WCDMA system; and (f) turning off the WCDMA modem and switching a communication link to the CDMA-2000 system through the CDMA-2000 modem.