Optical Tunnel Allocation for WDM Networks with Multi-granularity Switching Capabilities

Steven S W Lee, Maria C. Yuang, Po-Lung Tien, S. H. Lin

研究成果: Paper同行評審


For WDM networks with multi-granularity switching, Optical Tunnel Allocation (OTA) deals with the real-time establishment of optical tunnels between optical nodes through various optical multi-granularity switching devices. OTA is in principle a dynamic Routing and Wavelength Assignment (RWA) problem with multi-granularity switching devices taken into account. In this paper, we propose a novel approximation approach, called Lagrangean Relaxation with Heuristics (LRH), aimed to resolve RWA considering both fiber and lambda switches. Such RWA is first formulated as a combinatorial optimization problem in which the bottleneck link utilization is to be minimized. To tackle the problem, the LRH approach performs constraint relaxation and derives a lower-bound solution index according to a set of Lagrangean multipliers generated through subgradient-based iterations. In parallel, using the generated Lagrangean multipliers, the LRH approach employs a new heuristic algorithm to arrive at a near-optimal upper-bound solution. Through numerical results and comparisons, we delineate that the LRH approach achieves a near-optimal solution, which is profoundly tight to its lower bound, at the expense of low computational time complexity.

出版狀態Published - 1 十二月 2003
事件IEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States
持續時間: 1 十二月 20035 十二月 2003


ConferenceIEEE Global Telecommunications Conference GLOBECOM'03
國家United States
城市San Francisco, CA

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