Patent ID: 7672290

Claim:
A dual-mode mobile terminal for a user, comprising: a timer for generating an interrupt signal at a predetermined time, the dual-mode mobile terminal accessing at a time one of an asynchronous mobile communication system and a synchronous mobile communication system, the user being able to select one of the asynchronous mobile communication system and the synchronous mobile communication system for the dual-mode mobile terminal to transmit a call to the selected system; and a controller for the asynchronous mobile communication system and the synchronous mobile communication system, wherein the controller starts the timer when entering an asynchronous communication mode corresponding to a selection of the asynchronous mobile communication system by the user, connects to the synchronous mobile communication system to obtain accurate time information therefrom when receiving the interrupt signal from the timer, reconnects to the asynchronous mobile communication system after obtaining the accurate time information, and deactivates the timer when entering a synchronous communication mode corresponding to a selection of the synchronous mobile communication system by the user.