Patent ID: 6243597
Filing Date: 2001-06-05
Classification: H04W,Y02D

Abstract:
A battery-operated communications device operable in an active mode and a reduced power stand-by mode, the communications device comprising:a radio frequency part;a timing control arrangement, the timing control arrangement comprising a first logic block that comprises synchronization means for, during the reduced power stand-by mode, maintaining synchronization with respect to a beacon signal transmitted by a radio base station;a continuously running reference clock oscillator which is coupled to the timing control arrangement oscillator and which runs at the same clock speed during the active mode and the reduced power stand-by mode;a clock frequency reduction means for generating a derived clock signal having a frequency lower than a clock frequency of the reference clock oscillator, which derived clock signal controls the first logic block during the reduced power stand-by mode; anda baseband processing unit with a second logic block of which a clock input is disabled during the reduced power stand-by mode by a disable signal generated by the first logic block, the disable signal being generated upon exchange of synchronization information between the communication device and the radio base station when the communications device is in the active mode.