Signaling PHY preamble formats
First Claim
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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Abstract
A communication device determines a format for a physical layer (PHY) data unit. The communication device selects 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. The length value and the phase of modulation are selected to correspond to the determined format. A first value of a remainder resulting from dividing the length value by three corresponds to a first subset of formats; a second value of the remainder resulting from dividing the length value by three corresponds to a second subset of one or more formats. When 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 a multi-user format.
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Citations
9 Claims
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1. A method, comprising:
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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, and when 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. - View Dependent Claims (2, 3)
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4. An apparatus, comprising:
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a network interface device having one or more integrated circuit (IC) devices configured to; determine 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, select 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, the second subset of formats includes a multi-user format, and when 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; wherein the one or more IC devices are further configured to; generate 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 transmit the data unit. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification