Optimal Feedback Control of ABR Traffic in ATM Networks
Bo-Kyoung Kim and Charles Thompson
University of Masschusetts - Lowell
Abstract
In this work we will examine to the problem of regulating available
bit rate (ABR) traffic in an ATM network. A unique feature of ABR
service is the requirement that sources be regulated using information
from the distant ATM nodes. This feature is problematic for source
control schemes when time-delays incurred in the feedback path and the
temporal variation in the link capacity at the ATM node are
considered. A source rate control algorithm that allows for the
coordination of the traffic between sources sharing a congested node
is presented. It is shown that by correlating the traffic rates
between sources one can optimize preformance. An auto-regressive
moving-average (ARMA) model will be used as the control-law for the
aggregate input rate at the congested node. The optimal coefficients
of the model are chosen subject to the minimization of a quadratic
performance index. The results of the method are also given.
Bo-Kyoung Kim
Center for Advanced Computation and Telecommunications
University of Masschusetts - Lowell
Lowell, MA 01854
tel: (508)934-3661
bkim@cs.uml.edu
Charles Thompson
Center for Advanced Computation and Telecommunications
University of Masschusetts - Lowell
Lowell, MA 01854
tel: (508)934-3661
thompsonc@woods.uml.edu