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Transmit time offset in uplink multi-user multiple input-multiple output system

  • US 9,462,504 B2
  • Filed: 06/26/2014
  • Issued: 10/04/2016
  • Est. Priority Date: 11/19/2013
  • Status: Active Grant
First Claim
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1. An apparatus for an access point (AP) a processor and circuitry to:

  • monitor respective transmit powers for a plurality of wireless stations,determine a transmit time offset for a station having a lowest respective transmit power of the plurality of wireless stations,transmit the transmit time offset to the station,receive uplink data from the station, along with uplink data from other stations of the plurality of wireless stations, at a time adjusted by the transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique,determine a station, of the plurality of wireless stations, having a highest transmit power, andassign a zero transmit time offset to stations, of the plurality of wireless stations having a respective transmit power within a predetermined power difference from the highest transmit power,wherein transmission of the transmit time offsets and reception of the uplink data occurs within a transmission opportunity (TXOP) obtained by the AP.

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