Traffic Grooming Fault Tolerant Technique for Load-Balanced Routing and Wavelength Assignment in WDM Networks

ACHALA, DESHMUKH and NISHA, SARWADE and SURENDRA, BHOSALE (2015) Traffic Grooming Fault Tolerant Technique for Load-Balanced Routing and Wavelength Assignment in WDM Networks. In: Third International Conference on Advances in Computing, Electronics and Communication - ACEC 2015, 10-11 October, 2015, Zurich, Switzerland.

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Abstract

This problem of traffic grooming, routing, and wavelength assignment (GRWA) is considered with the objective of minimizing the number of transponders in the network. We first formulate the GRWA problem as an integer linear programming (ILP) problem. Unfortunately, the resulting ILP problem is usually very hard to solve computationally, in particular for large networks. To overcome this difficulty, a decomposition method is proposed that divides the GRWA problem into two smaller problems: the traffic grooming and routing (GR) problem and the wavelength assignment (WA) problem. In the GR problem, we only consider how to groom and route traffic demands onto light paths and ignore the issue of how to assign specific wavelengths to light paths. Similar to the GRWA problem, we can formulate the GR problem as an ILP problem. The size of the GR ILP problem is much smaller than its corresponding GRWA ILP problem. Once we solve the GR problem, we can then consider the WA problem, in which our goal is to derive a feasible wavelength assignment solution. In this paper, we implemented the fault tolerance technique to the load balanced Routing and Wavelength Assignment (RWA) problem in which the wavelength is allocated by using an advanced reservation algorithm. The primary path is set by applying Max-flow and load balancing techniques. A backup path is then computed for handling the failures by checking the class of the request as protection or restoration. Based on the class, we find the available bandwidth for each backup path. An auxiliary graph is constructed based upon the link cost. The backup path is computed using these link costs and the wavelength assignment is performed using the first fit wavelength assignment technique. From our simulation results, we show that by establishing the backup path, fault toleranc

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: ILP: integer linear programming, RWA: Routing and Wavelength Assignment, GRWA: grooming, routing, and wavelength assignment, GR: grooming and routing, FTPS: Fault Tolerant Path Set, NSF: National Science Foundation Standard network model.
Depositing User: Mr. John Steve
Date Deposited: 20 Apr 2019 11:35
Last Modified: 20 Apr 2019 11:35
URI: http://publications.theired.org/id/eprint/1416

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