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Medium access control for retro-reflectors

  • US 7,317,876 B1
  • Filed: 02/26/2004
  • Issued: 01/08/2008
  • Est. Priority Date: 02/26/2004
  • Status: Active Grant
First Claim
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1. A communication method for a retro-reflector device, the method comprising:

  • receiving, at the retro-reflector device, a first frame encoded in an input beam;

    creating and sending, from the retro-reflector device, a second frame in a first reflected beam, the first reflected beam being formed by the retro-reflector device reflecting the input beam along a path closely aligned with a path of the input beam, whereinat least one of the first frame or the second frame includes medium access control information;

    receiving, at a plurality of retro-reflector devices, respective first frames encoded in respective input beams;

    creating and sending, from the plurality of retro-reflector devices, respective second frames in respective first reflected beams formed by each of the plurality of retro-reflector devices reflecting the respective input beam along a path closely aligned with a respective path of the respective input beam, whereinfor each of the retro-reflector devices, at least one of the respective first frame or the respective second frame includes medium access control information;

    including, in at least some of the respective first frames, an indication of a data rate for a message within one of the at least some of the respective first frames and at least some of the respective second frames; and

    wherein the indication of the data rate for one retro-reflector device is different than the indication of the respective data rate for another retro-reflector device.

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