Abstract:
Supporting the diverse Quality of Service (QoS) requirements of the everemerging
Internet applications is one challenging task for optical networks'
operators. To come to grips with this challenge, we propose a QoS-Aware Optical
Connection Setup Management scheme that uses the Earliest Deadline First (EDF)
queuing discipline to schedule the setup of the optical connections. The benefits of
this EDF-based scheme are twofold: a) it reduces the blocking probability since
blocked connection requests due to resource unavailability are queued for possible
future setup opportunities and b) it realizes QoS differentiation by ranking the
blocked requests in the EDF queue according to their connection setup time
requirements, which are viewed as deadlines during connection provisioning. As
such, pending less delay-tolerant requests are guaranteed to experience better QoS
than the ones having longer setup time requirements. This work then takes one step
further by proposing various alternatives to the EDF-based management scheme.
More specifically, multiple scheduling strategies aiming at improving the fraction of
successfully established high priority connections are proposed, such as: Greedy
Scheduling (GS), Retrial Based Scheduling (RBS), Soft Scheduling (SS), Round Robin
Scheduling (RRS), and QoS Neutral Scheduling (QNS). Finally, extensive simulations
are performed to gauge the merits of the proposed strategies and to study their
performance in the context of two network topologies, namely, the National Science
Foundation Network (NSFNET) and the European Optical Network (EON).
