Patent Number: 6,311,081

Title: Low power operation in a radiotelephone

Abstract: Power consumption during low-power sleep mode in a radiotelephone (104) is minimized. At a predetermined wake-up time, temperature of the radiotelephone is determined (706). A variable wake-up duration is set in response to the temperature (708). After the variable wake-up duration, the radiotelephone returns to a normal operational mode (730). In this manner, circuitry remains in the low-power state as long as possible. Further, a low-resolution secondary timer is used to measure the duration of the sleep period. After the duration timed by the secondary timer, a second duration is timed by a high-resolution primary timer. A timing calibration duration is then timed and a sleep mode is exited in synchronization with system timing.

Inventors: Northcutt; John (Chapel Hill, NC), Holmqvist; Peter (Apex, NC)

Assignee: Ericsson Inc.

International Classification: H04B 1/38 (20060101); H04B 1/16 (20060101); H04B 001/38 ()

Expiration Date: 10/30/2018