Findings in Optical Communications and Networking Reported from G. Marchetto and Co-Researchers.

According to recent research from Turin, Italy, "The provision of service differentiation is an important aspect that has to be considered for the definition of next-generation networks due to the high heterogeneity of the traffic that will dominate networks in the near future. This is particularly important in the context of optical burst switching, which is emerging as one of the strong candidate technologies for the next-generation optical Internet."

"Preemptive contention resolution schemes are very effective solutions for providing service differentiation in such networks; however, they cannot be applied together with the just-in-time signaling protocol because of the great loss in efficiency in terms of wavelength utilization and maximum achieved throughput that results when the number of preemptions becomes too large. This paper presents a preemption-based service differentiation solution that is suitable for the just-in-time optical burst switching paradigm because it keeps the preemption probability (i.e., the probability of observing a preemption when a contention occurs) low. Within the proposed technique, bursts are created at their ingress node and combined into chains, arranging them in order of decreasing priority. Then, a conventional preemption scheme is adopted at core nodes to handle contentions," wrote G. Marchetto and colleagues.

The researchers concluded: "An analytical study is presented and some traffic scenarios are analyzed by simulation to evaluate the performance of the proposed method."

Marchetto and colleagues published their study in the Journal of Optical Communications and Networking (High-Priority First Transmission to Efficiently Support Service Differentiation in Just-in-Time OBS Networks. Journal of Optical Communications and Networking, 2010;2(12):1031-1041).

For additional information, contact G. Marchetto, Politecn Torino, Dipartimento Automat & Informat, Corso Duca Abruzzi 24, I-10129 Turin, Italy.

Publisher contact information for the Journal of Optical Communications and Networking is: Optical Society American, 2010 Massachusetts Avenue NW, Washington, DC 20036, USA.

Keywords: City:Turin, Country:Italy, Optical Communications and Networking

This article was prepared by Network Weekly News editors from staff and other reports. Copyright 2011, Network Weekly News via VerticalNews.com.