Patent ID: 7969944

Claim:
A handover method for a dual band dual mode mobile communication terminal in a mobile communication network in which an asynchronous mobile communication network and synchronous mobile communication network overlap, the terminal including an asynchronous wireless device for performing asynchronous communication with the asynchronous mobile communication network, a synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and a common module for performing control when wireless communication is performed with the synchronous and asynchronous mobile communication networks through the synchronous and asynchronous wireless devices, the handover method comprising: the first step of the base stations of the synchronous mobile communication network transmitting dummy pilot signals for the asynchronous mobile communication network, and the mobile communication terminal, for which call connection with the asynchronous mobile communication network is performed through the asynchronous wireless device, determining whether the dummy pilot signals for the asynchronous mobile communication network, which have been transmitted from the base stations of the synchronous mobile communication network, have been received through the asynchronous wireless device; the second step of the mobile communication terminal requesting handover to the asynchronous mobile communication network if, at the first step, it is determined that the dummy pilot signals for the asynchronous mobile communication network have been received; and the third step of the asynchronous mobile communication network determining that handover is possible, and notifying the mobile communication terminal of the determination that handover is possible, and the asynchronous mobile communication network requesting handover to the synchronous mobile communication network, thus performing handover, in response to the handover request at the second step.