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Wireless LANs and neighborhood capture

  • US 7,280,517 B2
  • Filed: 09/27/2002
  • Issued: 10/09/2007
  • Est. Priority Date: 11/02/2001
  • Status: Active Grant
First Claim
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1. A method of distributed dynamic bandwidth allocation for mitigating the effects of neighborhood capture in an infrastructure wireless local area network (WLAN), comprising the steps of:

  • time-slotting of a communications channel into superframes of superframe duration (SFDuration) by a MAC protocol, wherein said superframes comprise control and data frames and busy periods (BPs), wherein said BPS comprise contention-free periods (CFPs) and contention-free bursts (CFBs);

    assigning each BP an Arbitration-Time Inter-Frame Space (AEFS);

    further assigning an enhanced distributed coordination function (EDCF) station AEFS values according to said station'"'"'s priority classification;

    further assigning CFPs and CFBs a shortest possible AEFS value;

    further assigning available channels to cells;

    polling stations within a cell by an access point (AP) to determine if said stations within said cell have communications traffic to transmit;

    attempting to gain access to said communications channel by means of a contention-based scheme using a short reservation packet by said AP if said AP determined that said stations within said cell had communications traffic to transmit;

    performing frame exchanges if channel access is gained;

    gaining access to said communications channel by one of waiting for a backoff period and re-attempting to gain access to said communication channel in the event that a transmission by another cell is less than a full time slot if channel access was not gained and waiting to attempt to gain access until a next time slot; and

    performing a global channel release (GCR) of all channels at pre-specified intervals.

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