Hand Over Method for Dual Band/Dual Mode Mobile Communication Terminal

The present invention is a roaming capable dual band / relates to a handover method for a mobile communication terminal that supports a dual mode, the asynchronous mobile communication network to which the main processor when the power is turned on initial access mobile communication network desired in the synchronous mobile communication network and the asynchronous mobile communication network, When the set and equal to or smaller than a predetermined value, the signal strength is previously set in the step of connecting, the asynchronous mobile communication network in step 2 that performs the synchronous mobile communication network and the connection set up to enable the synchronous wireless device, received through the asynchronous wireless device, If the signal intensity of the asynchronous mobile communication network determines that the preset reference value or less if the determining step, the signal intensity of the asynchronous mobile communication network in said third step than the reference value for handover to the synchronous mobile communication network set at the step 2 step 4, to enable the connection, the asynchronous mobile communication network after the step 4 By including a fifth step of releasing a connection with, the effect that can perform the seamless handover between the asynchronous mobile communication network and a synchronous mobile communication network.