Fig. l(a) shows the proposed measurement-based fuzzy logic
connection admission controller. It consists of a fuzzy logic traffic
predictor, a fuzzy logic adaptive weight factor estimator and
a connection admission decision controller.
When a new connection request arrives, the new traffic trace
is predicted using the multi-step ahead predictor. Predicted Peak
Cell Rate (POR) is obtained at the end of a measurement intervaL
This predicted PCR is compared with the minimum available
free bandwidth on all relevant [inks which the new connection
will traverse. If it is higher than the minimum available free
bandwidth, the new connection is rejected; otherwise, the connection
is accepted.
As shown in Fig. l(a), the arrival rate, traffic load and queue
length are red into a fuzzy logic inference system which produces
a w eight factor (Fuzzy Logic Adaptive Weight Factor -
F AW F). This weight factor adjusts the available free bandwidth
adaptively according to the traffic conditions as expressed
by Equation (1).
Available Free Bandwidth