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19 November 2007 A novel topology-based integrated routing algorithm for IP/WDM traffic grooming
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Proceedings Volume 6783, Optical Transmission, Switching, and Subsystems V; 678306 (2007)
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
IP/WDM traffic grooming is a scheme that let different fine-grained IP layer Packet Label Switched Paths efficiently share the coarse-grained WDM layer lightpath. Choosing those nodes with high nodal degree as the terminals of lightpaths can save the transfer times of Packet LSP, thus on average each lightpath can hold more service to achieve better resource utilization and network throughput. To improve the resource utilization, this paper proposes the Topology-Based Lightpath Establishment Algorithm (TBLEA) which employs network topological characteristics to build more efficient lightpaths whose terminals are with high nodal degree. In the algorithm, a long lightpath, which is potentially less efficient, might be cut into several shorter lightpaths based on the topology characteristics and remaining resource of nodes in the primer lightpath. The algorithm has the advantages that not only the terminal nodes but also the length of new lightpath can promise to improve the PSC and LSC resource utilization. In the implementation of the TBLEA algorithm, a two-layer virtual graph helps to calculate the explicit integrated route to build Packet LSP, and different formulas are adopted to calculate the total costs of existing lightpaths and new lightpaths. A long lightpath might be cut into shorter lightpaths on the basis of the node weight, which is determined by the nodal degree and relative remaining resources. And iterative procedures offer the loop-free optimization of the changed explicit route for Packet LSP.
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Zhiang Yang, Lin Guo, and Yuefeng Ji "A novel topology-based integrated routing algorithm for IP/WDM traffic grooming", Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 678306 (19 November 2007);

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