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Signaling PHY preamble formats

  • US 10,348,446 B1
  • Filed: 07/30/2018
  • Issued: 07/09/2019
  • Est. Priority Date: 06/11/2015
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • determining, at a communication device, a format according to which a physical layer (PHY) data unit is to be generated, wherein the determined format is selected from a set of multiple PHY formats defined by a communication protocol;

    selecting, at the communication device;

    i) a length value to be included in a field in a legacy portion of a PHY preamble of the PHY data unit, and ii) a phase of modulation of an orthogonal frequency division modulation (OFDM) symbol in a non-legacy portion of the PHY preamble, wherein;

    the length value and the phase of modulation are selected to correspond to the determined format,the length value is not divisible by three,a first value of a remainder resulting from dividing the length value by three corresponds to a first subset of formats among the multiple PHY formats,the first subset of formats includes a multi-user format,a second value of the remainder resulting from dividing the length value by three corresponds to a second subset of one or more formats among the multiple PHY formats, andwhen the determined format belongs to the first subset, the phase of modulation of the OFDM symbol in the non-legacy portion of the PHY preamble indicates whether the PHY data unit conforms to the multi-user format;

    generating, at the communication device, the PHY data unit to include the selected length value in the field in the legacy portion of the PHY preamble and to modulate the OFDM symbol in the non-legacy portion of the PHY preamble with the selected phase; and

    transmitting, by the communication device, the PHY data unit.

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