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System and method for interference protection in downlink multi-user multiple-input, multiple-output communication

  • US 8,837,478 B1
  • Filed: 07/22/2011
  • Issued: 09/16/2014
  • Est. Priority Date: 07/23/2010
  • Status: Active Grant
First Claim
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1. An access point comprising:

  • a packet generation module configured to generate a multi-user request-to-send packet for transmission to each of N remote nodes,whereinthe multi-user request-to-send packet includes a plurality of addresses,each of the plurality of addresses is for a respective one of M of the N remote nodes,N is an integer greater than one, andM is an integer (i) less than or equal to N, and (ii) greater than or equal to 1;

    a packet detection module configured to detect clear-to-send packets received from ones of the N remote nodes; and

    a downlink control module configured to, based on the plurality of addresses, control a downlink to the M of the N remote nodes after M clear-to-send packets are detected respectively from the M of the N remote nodes,whereina transmission of a first one of the clear-to-send packets begins a short interframe space period after receiving the multi-user request-to-send packet,transmissions of a remainder of the clear-to-send packets are sequential, andstart times of each of the transmissions of the remainder of the clear-to-send packets is based ona transmission end time of the multi-user request-to-send packet,the short interframe space period, anda product of (i) a number of previously transmitted clear-to-send packets, and (ii) a sum of an amount of time to transmit one of the clear-to-send packets and the short interframe space period.

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