Apparatus and method for maintaining synchronization between a receiver having a crystal oscillator and a transmitter
First Claim
Patent Images
1. A method, comprising:
- in a receiver that includes an uncompensated crystal oscillator, receiving signals from a transmitter by activating the receiver periodically at intervals corresponding to a specified wake-up time period;
in response to detecting at the receiver that the specified wake-up time period is insufficient for maintaining synchronization between the receiver and the transmitter using the uncompensated crystal oscillator, selecting an actual wake-up time period that is smaller than the specified wake-up time period; and
activating the receiver periodically according to the selected actual wake-up time period.
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Abstract
A method includes, in a receiver that includes an uncompensated crystal oscillator, receiving signals from a transmitter by activating the receiver periodically at intervals corresponding to a specified wake-up time period. In response to detecting at the receiver that the specified wake-up time period is insufficient for maintaining synchronization between the receiver and the transmitter using the uncompensated crystal oscillator, an actual wake-up time period, smaller than the specified wake-up time period, is selected. The receiver is activated periodically according to the selected actual wake-up time period.
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Citations
20 Claims
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1. A method, comprising:
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in a receiver that includes an uncompensated crystal oscillator, receiving signals from a transmitter by activating the receiver periodically at intervals corresponding to a specified wake-up time period; in response to detecting at the receiver that the specified wake-up time period is insufficient for maintaining synchronization between the receiver and the transmitter using the uncompensated crystal oscillator, selecting an actual wake-up time period that is smaller than the specified wake-up time period; and activating the receiver periodically according to the selected actual wake-up time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus, comprising:
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a receiver, which comprises an uncompensated crystal oscillator and which is configured to receive signals from a transmitter; and control circuitry, which is configured to activate the receiver periodically at intervals corresponding to a specified wake-up time period, and, in response to detecting that the specified wake-up time period is insufficient for maintaining synchronization between the receiver and the transmitter using the uncompensated crystal oscillator, to select an actual wake-up time period that is smaller than the specified wake-up time period and to activate the receiver periodically according to the selected actual wake-up time period. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification