Radio telephone and method for operating a radiotelephone in slo

Details Radio telephone and method for operating a radiotelephone in slo Radio telephone and method for operating a radiotelephone in slo

1997-02-28

1999-06-08

Ton, Dang

Multiplex communications

Communication over free space

Signaling for performing battery saving

370320, 370335, 370342, 455 383, H04J 1304

Patent

active

059109440

ABSTRACT:
Prior to entry into a low-power sleep mode, a radiotelephone (104) in a radiotelephone system (100) calculates in advance the timing required to wake up selected portions of the radiotelephone and stores the calculated wakeup times in registers (216). Also prior to entry into sleep mode, local timing of the radiotelephone is synchronized to received PN roll boundaries from the radiotelephone system. In the sleep mode, the radiotelephone uses a sleep timer (210) to simulate system timing. When the sleep timer (210) matches the stored wakeup times, the radiotelephone re-activates the selected portions of the radiotelephone, such as an oscillator (116) and a radio frequency portion (109) of an analog front end (108), to exit the sleep mode and reacquire communication with the system. This also permits an early exit from sleep mode, for example to service an interrupt, while maintaining system timing.

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