Patent ID: 8179925

Claim:
An apparatus, applicable to a wireless local area network, for receiving a first beacon signal and a second beacon signal from a source device, where the first beacon signal comprises a first time stamp and the second beacon signal comprises a second time stamp, the apparatus comprising: a receiving circuit configuring to enter a normal mode or a power-saving mode according to a beacon output signal and to receive the first beacon signal and the second beacon signal when the receiving circuit operates in the normal mode; a computing circuit, coupled to the receiving circuit, for computing a time interval between the first beacon signal and the second beacon signal to obtain a first value and for computing a difference between the first time stamp and the second time stamp to obtain a second value; and an adjusting circuit, coupled to the computing circuit, for adjusting the beacon output signal according to the first and the second values; wherein the apparatus substantially synchronizes with the source device according to the beacon output signal.