Method and apparatus for providing reserve power in a cellular telephone
First Claim
1. A method for providing reserve power in a portable communication device, the method comprising the steps of:
- monitoring a power level of a battery of the portable communication device; and
automatically placing the portable communication device into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one emergency communication message.
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Accused Products
Abstract
Reserve power is provided in a portable cellular transceiver comprising a Global Positioning System (GPS) receiver by monitoring a power level of a battery of the portable cellular transceiver using a power detection circuit. A comparator circuit determines whether the power level of the battery is greater than a predetermined threshold. Based on the available power level, a power control circuit automatically places the transceiver into at least one low power mode when the power level reaches a corresponding threshold level. The low power mode selectively powers down circuitry of the portable cellular transceiver. The corresponding threshold level reserves power for an emergency telephone call. Power is provided to the circuitry of the portable cellular transceiver when the available power level is greater than the predetermined threshold. The reserve power provides power for the activation of the portable cellular transceiver, establishment of a call between the portable cellular transceiver and a cellular base station, transfer of GPS satellite acquisition aiding information to the portable cellular transceiver, receipt of GPS satellite information, communication of GPS satellite information to the cellular base station, and determination of a position of the portable cellular transceiver. The emergency telephone call may be a single button enhanced 911 call.
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Citations
46 Claims
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1. A method for providing reserve power in a portable communication device, the method comprising the steps of:
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monitoring a power level of a battery of the portable communication device; and
automatically placing the portable communication device into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one emergency communication message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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18. A method for providing reserve power in a portable cellular telephone comprising a position circuit, the method comprising the steps of:
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monitoring a power level of a battery of the portable cellular telephone; and
automatically placing the portable cellular telephone into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one emergency telephone call.
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23. A portable cellular transceiver comprising a Global Positioning System (GPS) receiver, the portable cellular transceiver comprising:
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a power detection circuit coupled to a battery, the power detection circuit monitoring a power level of the battery of the portable cellular transceiver; and
a power control circuit coupled to at least one transceiver circuit of the portable cellular transceiver for automatically placing the portable cellular transceiver into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one emergency telephone call.
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33. A hand-held cellular telephone system comprising a Global Positioning System (GPS) receiver, wherein the system comprises:
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a power detection circuit coupled to a battery for monitoring a power level of the battery of the hand-held cellular telephone system; and
a power control circuit coupled to a transceiver circuit of the portable cellular transceiver for automatically placing the hand-held cellular telephone system into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one call to an emergency operator. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. A computer readable medium containing executable instructions which, when executed in a processing system, causes the system to perform the steps for providing reserve power in a portable cellular transceiver comprising a Global Positioning System (GPS) receiver comprising:
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monitoring a power level of a battery of the portable cellular transceiver; and
automatically placing the portable cellular transceiver into at least one low power mode when the power level reaches at least one threshold level, wherein the at least one threshold level reserves power for at least one emergency telephone call. - View Dependent Claims (42, 43, 44, 45, 46)
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Specification