A strict priority scheme for quality-of-service provisioning in optical burst switching networks

TitleA strict priority scheme for quality-of-service provisioning in optical burst switching networks
Publication TypeConference Paper
Year of Publication2003
AuthorsKaheel, A., and H. Alnuweiri
Conference NameComputers and Communication, 2003. (ISCC 2003). Proceedings. 8th IEEE International Symposium on
Pagination16 - 21 vol.1
Date Publishedjun.
Keywordsbuffer-less optical burst switching networks, channel scheduling, dropping probability, end-to-end delay, IP networks, IP-over-WDM networks, optical fibre networks, preemptive latest available unused channel, preemptive prioritized just enough time, priority scheme, QoS provisioning, quality of service, quality-of-service, reservation protocol, signaling protocol, switching networks, transport protocols, void filling, wavelength division multiplexing

Classical approaches to quality-of-service (QoS) provisioning in IP networks are difficult to apply in all-optical networks. This is mainly because there is no optical counterpart to the store-and-forward model that mandates the use of buffers for queuing packets during contention for bandwidth in electronic packet switches. Since plain IP assumes a best effort service model, there is a need to devise mechanisms for QoS provisioning in IP over wavelength-division-multiplexing, or IP-over-WDM, networks. In this paper, we propose a new scheme; called preemptive prioritized just enough time (PPJET), for QoS provisioning in buffer-less optical burst switching (OBS) networks. PPJET provides strict priority for high priority traffic by dropping reservations belonging to lower priority traffic using a new channel scheduling algorithm called preemptive latest available unused channel with void filling (PLAUC-VF). Furthermore, we study the performance of PPJET through simulation experiments, and we show that PPJET outperforms prioritized just enough time (PJET) in terms of dropping probability and end-to-end delay.


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