Congestion control method in an ATM network based on threshold values of node queue length
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United States of America Patent
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Feb 17, 1998
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N/A
app pub date -
Apr 29, 1996
filing date -
Dec 22, 1993
priority date (Note) -
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Abstract
In the congestion control method, when a queue length of a node in a virtual channel set up in an ATM network is a first threshold or more, a source terminal in the virtual channel is instructed to decrease a transmission rate. When the queue length of a node is a second threshold or more which is greater than the first threshold, there is halted the transmission of data cells from the preceding nodes or source terminals to the bottleneck node. In a method of decreasing the transmission rate, congestion data is added to the header of a data cell passing through a node where the data cell queue is the first threshold or more, and the destination terminal which has received the data cell containing the congestion data transmits a rate decreasing control cell to the source terminal through the network. Receiving the rate decreasing control cell, the source terminal lowers the transmission rate. In another way, in a node where a cell queue length is the first threshold or more, a rate decreasing control cell is generated and transmitted to the source terminal.
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