Quality-of-service mechanisms in IP-over-WDM networks

TitleQuality-of-service mechanisms in IP-over-WDM networks
Publication TypeJournal Article
Year of Publication2002
AuthorsKaheel, A., T. Khattab, A. Mohamed, and H. Alnuweiri
JournalIEEE Communications Magazine

Classical approaches to QoS provisioning in IT 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 networks. Such mechanisms must consider the physical characteristics and limitations of the optical domain. This article presents a classification and survey of recent proposals for QoS provisioning and enforcement in IP-over-WDM networks. The different QoS proposals surveyed cover three major optical switching methods: wavelength routing, optical packet switching, and optical burst switching.

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