Patent ID: 6212398
Filing Date: 2001-04-03
Classification: H04B,H04W,Y02D

Abstract:
In a wireless telephone receiving pilot signals having a plurality of parameters from one or more base stations in a wireless network, said wireless telephone having a master timer synchronized to a timing reference in the wireless network, a slow clock, a processor and a memory, a method for rapidly reacquiring the timing reference after the master timer emerges from a sleep period, said method comprising:storing one or more of the pilot signals' parameters over time;calculating predicted parameters of the pilot signals after the sleep period based on the stored parameters;turning off power to the master timer and halting the processor;generating a wake-up interrupt responsive to the slow clock after the sleep period;turning power on to the master timer responsive to the wake-up interrupt;reacquiring the pilot signals having a plurality of parameters from one or more base stations;computing a time correction that most likely aligns the parameters of the received pilot signals and the predicted parameters; andadjusting the master timer by the time correction.