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Method of managing traffic flows in a wideband integrated services digital network, and a network for implementing the method

  • US 5,130,978 A
  • Filed: 11/23/1990
  • Issued: 07/14/1992
  • Est. Priority Date: 11/27/1989
  • Status: Expired due to Term
First Claim
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1. A method of managing traffic flows in a wideband integrated services digital network comprising an asynchronous time division multiplexed switching network and a plurality of terminals operating at various data rates and providing different types of service, the terminals transmitting and receiving data in the form of cells of fixed length and using a communications protocol adapted to asynchronous time division multiplexing;

  • wherein, in each terminal, said method comprises;

    transmitting an acknowledgement whenever a particular terminal receives a cell;

    continuing to transmit cells after having transmitted a first cell and while waiting to receive an acknowledgement corresponding to the first cell, and limiting the number of cells transmitted while waiting to a predetermined number;

    then suspending cell transmission during a predetermined duration if the acknowledgement is not received before all of the predetermined number of the cells have been transmitted;

    then retransmitting the first cell if the corresponding acknowledgement is not received during the predetermined duration;

    and then releasing the connection occupied by said particular terminal if the acknowledgement is not received after a predetermined delay measured from the first transmission of the first cell;

    wherein the predetermined values for the predetermined number, the predeterimined duration and the predetermined delay are functions of the type of service provided by said particular terminal;

    and wherein, in the switching network, if close to congestion, said method comprises;

    determining, for each connection, the values of the predetermined number, the predetermined duration and the predetermined delay as a function of the type of service being provided by the terminate connected to said each connection;

    delaying a sequence of cells transmitted on said each connection, while limiting the number of cells in said sequence to a number which is less than or equal to the predetermined number; and

    loosing a cell and other identical cells transmitted on said each connection, while limiting the duration corresponding to cell loss to a value less than the predetermined delay.

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