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Low bandwidth PHY for WLAN

  • US 8,902,869 B2
  • Filed: 06/12/2012
  • Issued: 12/02/2014
  • Est. Priority Date: 06/15/2011
  • Status: Active Grant
First Claim
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1. A method, in a communication system, of generating and causing to be transmitted data units conforming to a first physical layer (PHY) mode and data units conforming to a second PHY mode different than the first PHY mode, wherein the communication system utilizes a plurality of channels for transmitting data units conforming to the first PHY mode, and wherein each channel of the plurality of channels has a first bandwidth, the method comprising:

  • generating a first data unit conforming to the first PHY mode, wherein generating the first data unit includes generating a first series of orthogonal frequency division multiplexing (OFDM) symbols;

    causing the first data unit to be transmitted via a channel of the plurality of channels;

    generating a second data unit conforming to the second PHY mode, whereingenerating the second data unit includes generating a second series of OFDM symbols, andat least a portion of the second series of OFDM symbols includes one of (i) more upper-edge guard tones than lower-edge guard tones, or (ii) more lower-edge guard tones than upper-edge guard tones;

    determining a frequency band for transmitting the second data unit, whereinthe frequency band has a second bandwidth equal to the first bandwidth divided by an integer n, wherein n≧

    2,determining the frequency band for transmitting the second data unit includes excluding one of (i) a lowest sub-band of each of one or more channels in the plurality of channels when the portion of the second series of OFDM symbols includes more upper-edge guard tones than lower-edge guard tones or (ii) a highest sub-band of each of the one or more channels in the plurality of channels when the portion of the second series of OFDM symbols includes more lower-edge guard tones than upper-edge guard tones, andeach sub-band of each channel in the plurality of channels has the second bandwidth; and

    causing the second data unit to be transmitted via the determined frequency band.

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