Abstract
Packet-switched wavelength-division multiplexing (WDM) ring networks have been
extensively studied as solutions to the increasing amount of traffic in metropolitan
area networks, which is widely expected to be a mix of unicast and multicast
traffic. We study the fairness between unicasting and multicasting in slotted
packet-switched WDM ring networks that employ a tunable transmitter and fixed tuned
receiver at each node and a posteriori buffer selection. We find that single-step
longest-queue (LQ) buffer selection generally results in unfairness between
unicasting and multicasting or a fixed relative priority for multicast versus
unicast traffic. We propose and evaluate dual-step buffer selection policies that
achieve fairness and allow for a range of relative priorities of multicast versus
unicast traffic.
© 2004 Optical Society of America
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