Power saving mode for wireless telephones
First Claim
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1. A method of reducing power consumption in a dual mode wireless receiver that monitors messages from a forward overhead channel in a standby mode, the method comprising:
- decoding a pertinent word for the receiver in a particular message;
deactivating a PLL (Phase-Locked Loop) regulator to turn off the receiver while keeping a main PLL active;
turning on the PLL regulator again some time prior to a next pertinent word, only if necessary to satisfy a redundancy check, otherwise keeping the receiver turned off until the next message; and
repeating the above steps for the next message.
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Abstract
Reducing power consumption in a dual mode wireless phone, such as a CDMA/AMPS phone, that monitors messages from a forward overhead channel in a standby mode is desirable. It includes turning a receiver off after decoding a pertinent word for the receiver in a particular message and turning it on again some time prior to a next pertinent word. The turn-on is initiated only if necessary to satisfy a redundancy check or if the next word is a beginning of a next message.
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Citations
16 Claims
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1. A method of reducing power consumption in a dual mode wireless receiver that monitors messages from a forward overhead channel in a standby mode, the method comprising:
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decoding a pertinent word for the receiver in a particular message;
deactivating a PLL (Phase-Locked Loop) regulator to turn off the receiver while keeping a main PLL active;
turning on the PLL regulator again some time prior to a next pertinent word, only if necessary to satisfy a redundancy check, otherwise keeping the receiver turned off until the next message; and
repeating the above steps for the next message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
performing synchronization of the receiver to the particular message.
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3. The method of claim 1, wherein the dual mode wireless telephone is a CDMA/AMPS phone.
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4. The method of claim 1, wherein the pertinent word is selected from a group comprising type A and type B words.
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5. The method of claim 4, wherein the particular message includes five repeating type A words and five repeating type B words interleaved with each other.
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6. The method of claim 5, wherein the redundancy check is satisfied if at least three out of five of the pertinent words are matched.
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7. The method of claim 1, wherein the redundancy check is satisfied if the pertinent word matches a previously defined control filler word.
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8. The method of claim 1, wherein the pertinent word is approximately 4.4 milliseconds in length.
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9. The method of claim 8, wherein said some time is approximately one millisecond.
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10. A method of operating both modes of a dual mode wireless telephone at reduced power, the method comprising:
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deactivating a PLL (Phase-Locked Loop) regulator, while keeping a main PLL active, to turn off a receiver of said telephone after decoding a current relevant packet of data in a message; and
turning on the PLL regulator again at an appropriate amount of time prior to a next relevant packet of data if the combined current and next packets of data in the message do not satisfy a redundancy check, the current packet of data indicates that further decoding is necessary, or the next packet of data is a start of another message.
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11. A circuit for providing a sleep state for both modes of a dual mode wireless telephone, said telephone having a receiver for receiving RF signals, the circuit comprising:
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a transistor having a base, a collector, and an emitter terminals, said collector terminal coupled to said receiver;
a supply voltage coupled to said collector terminal;
a mode signal providing input to the base terminal of said transistor; and
a sleep signal providing input to the emitter terminal of said transistor, such that when the sleep signal is asserted in a particular mode indicated by the mode signal, the collector of said transistor is driven to turn the receiver off. - View Dependent Claims (12, 13, 14)
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15. A dual mode wireless telephone system comprising:
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a housing;
electronic components within the housing including a circuit for providing a sleep state for both modes of the dual mode phone, said telephone having a receiver for receiving RF signals, said circuit including;
a transistor having a base, a collector, and an emitter terminals, said collector terminal coupled to said receiver;
a supply voltage coupled to said collector terminal;
a mode signal providing input to the base terminal of said transistor;
a sleep signal providing input to the emitter terminal of said transistor, such that when the sleep signal is asserted in a particular mode indicated by the mode signal, the collector of said transistor is driven to turn the receiver off.
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16. A method of operating both modes of a dual mode wireless telephone at reduced power, the method comprising:
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providing a first signal level to an input terminal of a transistor to produce a first output to turn off a receiver of said telephone after decoding a current relevant packet of data in a message; and
providing a second signal level to the input terminal to produce a second output to turn the receiver back on at an appropriate amount of time prior to a next relevant packet of data if the combined current and next packets of data in the message do not satisfy a redundancy check, the current packet of data indicates that further decoding is necessary, or the next packet of data is a start of another message.
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Specification