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Led by Prof. Ioannis Lambadaris.
In the area of routing in optical networks, we develop a modified
BGP routing algorithm called Optical BGP (O-BGP) that establishes
end-to-end lightpaths and performs wavelength assignment.
Furthermore, the project has developed methods for computing
blocking probabilities (i.e. non-availability of wavelength) for
optical connections under different routing/wavelength allocation
schemes. The research in optical networks continues in the areas of
optimal wavelength allocation in a WDM optical network and
scheduling algorithms for optical Resilient Packet Ring (RPR)
networks. In the area of wavelength allocation, the objective is to
determine a policy maximizing the weighted sum of users of all
classes or minimizing the class-based blocking. In the area of
resilient packet ring, we investigate how different classes of
traffic in an optical ring can be assigned to different queues on
board the ring and what scheduling disciplines have to be followed
for serving the queues at different nodes so that delay and blocking
is minimized. The problem is referred as source based queuing.
The research on IP network performance concentrates on congestion
control algorithms in TCP/IP networks. We study the effect of a
congestion control mechanism on IP, i.e. Explicit Congestion
Notification (ECN), Backward Explicit Congestion Notification (BECN)
and Multiple threshold ECN (MECN). We compare the performance of
buffer management schemes for DiffServ assured forwarding Per Hop
Behavior (PHB). We also work on the development of video
multicasting transport protocols over IP networks. Our research
efforts concentrate on approaches and methodologies that will enable
QoS guarantees for video multicasting over the best-effort Internet
architecture.
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