NDLI: A new model for optimal routing and wavelength assignment with fixed-length tunnel allocation in multigranularity cross-connect WDM networks

Content Provider	IEEE Xplore Digital Library
Author	Chien Chen Xiu-Jia Kuo Ying-Yu Chen Tse-Yu Lo
Copyright Year	2005
Description	Author affiliation: Dept. of Comput. & Inf. Sci., Nat. Chiao Tung Univ., Hsinchu (Chien Chen; Xiu-Jia Kuo; Ying-Yu Chen; Tse-Yu Lo)
Abstract	Multi-granularity optical cross-connect (MGOXC) has been proposed to provide a cost-efficient way to support the growing demand for bandwidth. In the MG-OXC networks, consecutive wavelengths are bundled to form a tunnel and then switched as a single unit. Network resources at the intermediate nodes on the route of a tunnel, including switching fabrics and multiplexers, can thus be reduced. In this paper we consider the problem of routing and wavelength assignment (RWA) with tunnel allocation in MG-OXC networks. Given a set of static lightpath requests, our problem is to (a) allocate a set of fixed-length tunnels (b) find routes from the source nodes to their respective destination nodes, and (c) assign wavelengths to theses route. The objective here is to minimize the blocking probability. Furthermore, we extend our work for the dynamic RWA problem. Given a historical traffic matrix, the dynamic RWA problem is how to build a set of tunnels off-line to accommodate the future dynamic lightpath requests in such a way that the blocking probability can be minimized. In order to utilize the wavelength ports and fibers efficiently, each tunnel established should follow a tunnel length constraint which could be equal to the average network hop distance. Based on this criterion, a novel graph model is proposed in which edges are added only for the node pairs whose hop distance follow the tunnel length constraint to form an auxiliary graph. In this paper, we suggest a 0/1 integer linear programming (ILP) formulation for RWA with tunnel allocation in MG-OXC networks under the tunnel length constraint. The previous auxiliary graph model is extended to a layered auxiliary graph model to facilitate the formulation. We compare the performance of different heuristics, including CB-STA, WTA and PCWTA to the ILP solution. The simulation results show that PC-WTA and WTA outperforms CB-STA in all switching type combinations and network topologies, and they are very close to the optimal value calculated from our ILP formulation
Starting Page	1270
Ending Page	1276
File Size	7490124
Page Count	7
File Format	PDF
ISBN	0780393937
DOI	10.1109/MILCOM.2005.1605853
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wavelength routing Wavelength assignment Intelligent networks WDM networks Optical network units Optical fiber networks Optical crosstalk Bandwidth Integer linear programming Computer networks
Content Type	Text
Resource Type	Article

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