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Congestion control for cell networks

  • US 5,313,454 A
  • Filed: 04/01/1992
  • Issued: 05/17/1994
  • Est. Priority Date: 04/01/1992
  • Status: Expired due to Term
First Claim
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1. A feedback control system for congestion prevention control on a virtual connection of a cell switching communications network handling bursty traffic, the feedback control system comprising:

  • a) a source node for accepting, queuing, and buffering user framed bursty data, for formatting the bursty data into bursty data cells, and for transmitting the bursty data cells over the virtual circuit connection through the cell switching communications network at an incrementally variable controllable transmission rate in response to a rate control signal to avoid congestion, wherein the source node and any intermediate node comprising the virtual connection include means for accepting, queuing, and buffering, the bursty data cells, means for detecting incipient congestion in the virtual connection queues and buffers, means for setting an incipient congestion indicator to a first state if incipient congestion is detected and setting the incipient congestion indicator to a second state if incipient congestion is not detected, and means for forwarding the bursty data cells over the virtual connection together with the incipient congestion indicator; and

    b) a destination node, which is a terminus of the virtual connection, for accepting the bursty data cells and the incipient congestion indicator, for reconstructing, formatting, and outputting the framed bursty data, for monitoring the incipient congestion indicator, for generating the rate control signal based on the incipient congestion indicator, for transmitting the rate control signal back to the source node.

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