Table V shows the maximum, average and deviation of queue
length of switch 1 to switch 6 for both schemes. There are slight
differences in the maximum queue length since it depends on
the ICR, the distance of the feedback path and the queue control
functions. Once the feedback is established, the fuzzy logic con
trol scheme is shown to have a lower maximum queue length,
especially the SW3, SW4, SW5 and SW6 queues.
The average queue length and queue deviation are computed
after 400 msec when the rates have converged. Generally, the
fuzzy logic control scheme has a much lower and stable queue
compared to the conventional scheme.
Hence the fuzzy logic control scheme is shown to be able to
optimize both the transient and steady state responses, i.e. con
verges quickly to a solid steady state from the initial conditions,
and drains the queue produced in the transient phase rapidly