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Method and system for explicit AP-to-AP sounding in an 802.11 network

  • US 9,100,154 B1
  • Filed: 08/01/2014
  • Issued: 08/04/2015
  • Est. Priority Date: 03/19/2014
  • Status: Active Grant
First Claim
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1. An access point comprising:

  • a plurality of antennas;

    a plurality of radio circuitries configured to transmit and receive signals via the plurality of antennas; and

    a baseband processor configured to monitor the signals received by the radio circuitries and generate a list of neighboring co-channel access points, each neighboring co-channel access point having a plurality of antennas and each being located within a clear channel assessment (CCA) range of the access point,wherein the baseband processor is further configured to instruct the radio circuitries to transmit a sounding sequence to the list of neighboring co-channel access points, and receive Channel State Information (CSI),wherein the baseband processor is further configured to set weights on the radio circuitries to produce a null at one or more antennas of the listed neighboring co-channel access point which currently transmits on a same frequency channel and downloads of a packet to a station (STA), or a group of STAs,wherein null weights are determined via an explicit sounding process invoked between the access point and each of the listed neighboring co-channel access points, based on a null data packet (NDP) announcement by a nulling AP and response by a nulled AP,wherein the access point sounding set (APSS) NDP announcement and NDP comprise an access point sounding set ID field replacing an STA ID field in a MU MIMO protocol.

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