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Method for transmitting signal field and apparatus therefor

  • US 9,935,802 B2
  • Filed: 04/18/2014
  • Issued: 04/03/2018
  • Est. Priority Date: 04/19/2013
  • Status: Active Grant
First Claim
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1. A method for transmitting a signal field in a wireless local area network (WLAN), the method comprising:

  • generating, by a first STA,a legacy signal used to transmit a legacy signal (L-SIG) field, anda first signal, a second signal, and a third signal, each of which used to transmit a signal (SIG) field,wherein the L-SIG field and the SIG field are included in a physical layer preamble of a physical layer protocol data unit (PPDU); and

    transmitting, by the first STA, the physical layer preamble including the L-SIG field and the SIG field to a second STA,wherein the legacy signal, the first signal, the second signal, and the third signal are respectively transmitted on a reference orthogonal frequency division multiplexing (OFDM) symbol, a first OFDM symbol, a second OFDM symbol and a third OFDM symbol,wherein the reference OFDM symbol is directly followed by the first OFDM symbol, which is directly followed by the second OFDM symbol, which is directly followed by the third OFDM symbol,wherein the SIG field indicates a time duration of a transmission opportunity (TXOP) used for the second STA,wherein a binary phase shift keying (BPSK) constellation is used in the reference OFDM symbol, and the first OFDM symbol, andwherein at least one of a second constellation used in the second OFDM symbol or a third constellation used in the third OFDM symbol is rotated relative to a first constellation used in the first OFDM symbol.

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