Method for increasing stand-by time in portable radiotelephones
First Claim
1. A power control circuit structure comprising:
- a first group of circuit devices having a short initiation response time;
a second group of circuit devices having long initiation response time relative to said initiation response time of said first group; and
a power control circuit, operatively connected to said first and second groups of circuit devices, for selectively deactivating any one of the following;
said first group of circuit devices, said second group of circuit devices and both said first and said second groups of circuit devices according to an expected duration of a standby mode.
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Abstract
Reduced current drain is effected by cycling off non-essential circuits within the radiotelephone during periods of inactivity. The period of inactivity is dynamically allocated using data update messages sent over the analog control channel. Each data update message consists of an update index and a data message. The mobile radiotelephone receives the update index to determine if there has been any change to the data message. If there has been no change to the message, the mobile radiotelephone turns off non-essential circuits during the duration of the data message. In this manner, the mobile radiotelephone may be quiescent for as long as the data message, e.g., 20 words, or 950 milliseconds of each full second. This corresponds to a 5% duty cycle. The duration of the quiescent period allows components with a slow response time, such as the frequency synthesizer, to be deactivated further reducing battery drain. The length of the data message may also be dynamically changed to optimize stand-by time relative to paging activity.
84 Citations
13 Claims
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1. A power control circuit structure comprising:
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a first group of circuit devices having a short initiation response time; a second group of circuit devices having long initiation response time relative to said initiation response time of said first group; and a power control circuit, operatively connected to said first and second groups of circuit devices, for selectively deactivating any one of the following;
said first group of circuit devices, said second group of circuit devices and both said first and said second groups of circuit devices according to an expected duration of a standby mode. - View Dependent Claims (2, 3, 4)
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5. A method of controlling power consumption, comprising the steps of:
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receiving a message which includes an indication of a period of time before a next relevant message is to be expected; determining whether said period of time is greater than or less than a given value; turning off a first group of circuit devices if said period of time is less than said given value, said first group of circuit devices having a combined deactivation and reactivation time less than said period of time; and turning off at least said second group of circuit devices if said period of time is greater than said given value, said second group of circuit devices having a combined deactivation and reactivation time greater than said period of time. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification