Low power operation in a radiotelephone
AssigneeEricsson Inc.
InventorsJohn Northcutt, Peter Holmqvist
Life of this patent
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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.
Claims16
A method for operating a radiotelephone, the method comprising the steps of:
- (a) determining a predetermined wakeup time;
- (b) entering a low-power sleep mode;
- (c) at the predetermined wakeup time,
- (c1) determining a temperature of the radiotelephone;
- (c2) setting a variable wakeup duration in response to the temperature;
- and
- (c3) after the variable wakeup duration, returning to a normal operational mode.
A method for operating a radiotelephone, the method comprising the steps of:
- (a) determining a predetermined wakeup time;
- (b) removing power from operating circuitry of the radiotelephone to enter a low power sleep mode;
- (c) in response to clocking signals, timing duration of the low power sleep mode;
- at the end of the low power sleep mode,
- (d) measuring temperature;
- (e) setting a software timer to measure a wakeup time having a wakeup duration based on the temperature;
- (f) clocking the software timer;
- and
- (g) after the wakeup duration, providing power to operating circuitry.
A method for operating a radiotelephone, the method comprising the steps of:
- (a) entering a low power sleep mode;
- (b) using a hardware clock to measure a wakeup time;
- (c) at the wakeup time,
- (c1) providing operational power to predetermined circuitry of the radiotelephone;
- (c2) starting a software clock;
- (d) measuring a predetermined time duration with the software clock;
- and
- (e) after the predetermined time duration, providing operating power to additional circuitry.
A method for operating a portable radiotelephone in a radiotelephone system, the method comprising the steps of:
- using a high resolution primary timer, timing operation of the radiotelephone in synchronization with timing of the radiotelephone system;
- entering a low power sleep mode;
- timing duration of the low power sleep mode using a low resolution secondary timer;
- timing a calibration duration using the primary timer to synchronize the timing of the radiotelephone with the timing of the radiotelephone system;
- and
- exiting the sleep mode.
A method for operating a portable radiotelephone in a radiotelephone system, the method comprising the steps of:
- entering a low power sleep mode;
- timing a predetermined sleep duration;
- at end of the sleep duration, activating a primary clock;
- timing a warmup duration;
- after the warmup duration, activating the primary clock;
- timing a calibration duration with the primary clock;
- and
- at the end of the calibration duration, exiting the sleep mode.
Dependencies are inferred from the claim text.