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Maintaining coordination following a wireless reset

  • US 10,296,286 B2
  • Filed: 08/15/2017
  • Issued: 05/21/2019
  • Est. Priority Date: 12/13/2016
  • Status: Active Grant
First Claim
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1. An electronic device, comprising:

  • one or more antennas;

    a clock circuit that is configured to provide a clock; and

    an interface circuit communicatively coupled to the one or more antennas and the clock circuit, wherein the interface circuit is configured to;

    receive, from the one or more antennas, packets associated with a second electronic device, wherein a given packet comprises a transmit time, based on a second clock in the second electronic device, when the second electronic device transmitted the given packet;

    store receive times when the packets were received, wherein the receive times are based on the clock;

    calculate, based on differences between the transmit times and the receive times, relative drift as a function of time between the clock and the second clock;

    adjust, based on the relative drift, the clock circuit to eliminate the relative drift;

    store adjustments to the clock circuit from the adjust operation; and

    when the interface circuit or a second interface circuit in the second electronic device is reset, adapt the clock circuit based on the stored adjustments to reduce the relative drift while the interface circuit restores frequency lock with the second clock based on additional packets with additional transmit times that are received from the one or more antennas.

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