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Random medium access methods with backoff adaptation to traffic

  • US 7,027,462 B2
  • Filed: 01/02/2002
  • Issued: 04/11/2006
  • Est. Priority Date: 01/02/2001
  • Status: Expired due to Fees
First Claim
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1. A method for a distributed medium access protocol that schedules transmission of different types of packets on a channel based on a service quality specification for each type of packet, comprising the steps of:

  • determining at a plurality of nodes in an access network, an urgency class of pending packets according to a scheduling algorithm;

    transmitting pending packets in a given urgency class before transmitting packets of a lower urgency class;

    remembering the number of transmission attempts by a node for the last transmission of same node;

    estimating from said number of transmission attempts a current congestion experienced;

    adjusting a backoff counter to current congestion levels to provide a dispersion of packet traffic bursts;

    broadcasting with each transmission the number of transmission attempts by a node;

    estimating from said number of transmission attempts received from other nodes the current congestion experienced; and

    adjusting a backoff counter to current congestion levels to provide a dispersion of packet traffic bursts.

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