Congestion control for connectionless traffic in data networks via alternate routing
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
Jul 3, 1990
filing date -
Jul 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A congestion control scheme for connectionless networks relieves congestion by routing a portion of traffic on a congested primary path onto a predefined alternate path constructed such that loop-freedom is guaranteed. Explicit care is taken to avoid spreading congestion onto alternate paths. The control actions are taken in a completely distributed manner, based on local measurements only and therefore no signaling messages need to be exchanged between nodes. If desired, lower loss priority may be assigned to alternate routed traffic. Congestion is monitored locally and thresholds defined to declare the onset and abatement of congestion. The present invention affords at least an order of magnitude improvement in end-to-end cell blocking under sustained focussed overload.
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