Gj. Miller et M. Paterakis, A DYNAMIC BANDWIDTH-ALLOCATION-BASED PRIORITY MECHANISM FOR THE PI-PERSISTENT PROTOCOL FOR MANS, IEEE journal on selected areas in communications, 11(8), 1993, pp. 1229-1239
While a variety of medium access protocols have been proposed recently
for Metropolitan Area Networks (MAN's), the problem of handling multi
priority traffic effectively in these networks remains open. We presen
t a simple and effective priority mechanism for an existing MAN protoc
ol known as the p(i)-persistent protocol, a probabilistic scheduling s
cheme which has been shown to be suitable for applications requiring l
arge bandwidth over long, repeater-free distances. Our mechanism works
by clipping the low-priority stations in a controlled manner, and the
reby increasing the bandwidth available to the high-priority stations.
This mechanism operates entirely within the framework of the basic p(
i)-persistent protocol, and may be easily tailored to achieve specific
performance goals by selection of a single operating parameter. In ad
dition, we present a multipriority version of a distributed algorithm
by which the stations can update their operating parameters and adapt
to changing network conditions dynamically.