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G+: enhanced traffic grooming in WDM mesh networks using lighttours
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/2010
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| Title: | G+: enhanced traffic grooming in WDM mesh networks using lighttours |
| Authors: | Solano, Fernando
Caro, Luis
de Oliveira, Jaudelice C.
Fabregat, Ramon
Marzo, Jose Luis |
| Keywords: | Wavelength Division Multiplexing (WDM)
Lighttours
Traffic Grooming
Lightpath
Mesh Network
Integer Linear
Program (ILP)
Photonic Switching Systems
Optical Transport
Network (OTN)
Photonic Cross-Connect (PXC)
Optimization
Optical-Electronic-Optical Conversions (OEO)
Lambda-Monitoring |
| Issue Date: | Jun-2007 |
| Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
| Citation: | IEEE Journal on Selected Areas in Communications, 25(5): pp. 1034-1047. |
| Abstract: | In this article, a new technique for grooming
low-speed traffic demands into high-speed optical routes is
proposed. This enhancement allows a transparent Wavelength-
Routing Switch (WRS) to aggregate traffic en route over existing
optical routes without incurring expensive Optical-Electrical-
Optical (OEO) conversions. This implies that: a) an optical route
may be considered as having more than one ingress node (all
inline) and, b) traffic demands can partially use optical routes to
reach their destination. The proposed optical routes are named
“lighttours” since the traffic originating from different sources
can be forwarded together in a single optical route, i.e., as taking
a “tour” over different sources towards the same destination. The
possibility of creating lighttours is the consequence of a novel
WRS architecture proposed in this article, named “Enhanced
Grooming” (G+). The ability to groom more traffic in the middle
of a lighttour is achieved with the support of a simple optical
device named λ-monitor (previously introduced in the RingO
project). In this article, we present the new WRS architecture
and its advantages. To compare the advantages of lighttours with
respect to classical lightpaths, an Integer Linear Programming
(ILP) model is proposed for the well-known multilayer problem:
Traffic Grooming, Routing and Wavelength Assignment. The ILP
model may be used for several objectives. However, this article
focuses on two objectives: maximizing the network throughput,
and minimizing the number of Optical-Electro-Optical conversions
used. Experiments show that G+ can route all the traffic
using only half of the total OEO conversions needed by classical
grooming. An heuristic is also proposed, aiming at achieving near
optimal results in polynomial time. |
| URI: | http://dx.doi.org/10.1109/JSAC.2007.070615
http://hdl.handle.net/1860/2010 |
| Appears in Collections: | Faculty Research and Publications (ECE)
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