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Method and apparatus for low-power, long-range networking

  • US 9,042,353 B2
  • Filed: 10/06/2011
  • Issued: 05/26/2015
  • Est. Priority Date: 10/06/2010
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • one or more circuits operable to;

    transmit and receive data wirelessly over a medium to which access is time-division multiplexed into a plurality of repeating windows, wherein;

    a first window of said plurality of repeating windows is time-division multiplexed into a plurality of timeslots; and

    a second window of said plurality of repeating windows is time-division multiplexed into a plurality of timeslots;

    receive assignment of a first timeslot for transmission when an alarm condition is not present, wherein said first timeslot is one of said plurality of timeslots of said first window;

    detect the presence of said alarm condition;

    in response to said detection of said alarm condition, determine a second timeslot based on said first timeslot and a hash function, wherein said second timeslot is one of said plurality of timeslots of said second window; and

    transmit an alarm signal during said second timeslot.

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