Patent ID: 7508782

Claim:
A wireless mobile communication device comprising: a battery; at least one antenna; first and second wireless interfaces operable with said at least one antenna, said first and second wireless interfaces being arranged to be individually powered from said battery; and a controller for setting said first wireless interface in a power-ON state for establishing a first wireless link with a first base station, wherein said controller is arranged to detect field strengths of the first wireless interface at successive intervals, estimate, from said detected field strengths, timing at which subsequent field strength of said first wireless interface will drop below a threshold value, compare the estimated timing to next timing at which the field strength of the first wireless interface will be detected, and make a determination that a handover is necessary if said estimated timing is nearer than said next timing, said controller is further arranged to set the second wireless interface in a power-ON state to perform a cell search in response to the determination that a handover is necessary, establish a second wireless link with a second base station when the same is detected by the cell search, and set the first wireless interface in a power-OFF state at the instant said second wireless link is established.