Title: Deflection Routing Strategies in Optical Burst-Switched Networks

Authors: T. Coutelen, H. Elbiaze, B. Jaumard, A. Metnani

Speakers: T. Coutelen and A. Metnani

Optical Burst Switching (OBS) is a very promising technology for the
next generation optical Internet as it offers a more efficient
bandwidth utilization and a great
potential for an efficient integration of IP and WDM technologies.
However, several critical issues still need to be solved such as 
contention resolution without optical buffering.
Contention arises when two or more bursts compete for the same
output fiber on the same wavelength at the same time. It is a key
determinant of packet-loss performance with a
significant impact on network performance.
*In the first part of the talk*, we propose
and evaluate three new deflection routing strategies which aim at
resolving contention. They lead to significant better network
performance when compared with the most recent contention resolution schemes
proposed in the literature. One of the drawbacks of the deflection
routing mechanisms discussed in the literature is their lack of
ability for computing alternative paths based on clear design
constraint. The proposed deflection strategies are based on
different alternative path computing methods: i) Shortest Path(SP),
ii) Latest Available Unused Channel with Void Filling (LAUC-VF) and
iii) Least Used Wavelength (LUW). Simulation under different traffic
assumptions have been conducted on the EONET network to analyze and
compare the three new deflection routing strategies.
In the second part of the talk, we will discuss how to modify the best
strategy of the previous study so as to make it an adaptative strategy that
can reacts to the variation of the traffic.