Controller for input-queued packet switch
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United States of America Patent
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-
Oct 19, 1993
Grant Date -
N/A
app pub date -
May 5, 1992
filing date -
May 5, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Significant throughput improvement is achieved for an input queued packet switch using output port schedulers by permitting the output schedulers to recycle or reassign cell transmission times from input ports which are unable to use them. When an output scheduler assigns a cell transmission time to an input port and that input port is unable to use the assigned transmission time due to a scheduling conflict, for example, the input port makes a new request for the same output port during the next subsequent request period and then returns the unusable transmission time assignment back to the output scheduler. The output scheduler stores the returned transmission time in a separate queue for assignment to later requests for the particular output port. Throughput performance is improved from 58% (without time slot recycling) to 92% (with time slot recycling) for random packet cell traffic models.
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