On disjoint path pairs with wavelength continuity constraint in WDM networks

Reid Andersen, Fan Chung, Arunabha Sen, Guoliang Xue

Research output: Chapter in Book/Report/Conference proceedingConference contribution

35 Scopus citations

Abstract

In a WDM optical network, each fiber link can carry a certain set of wavelengths Λ = {λ 1, λ 2, ⋯, λ W}. One scheme for tolerating a single link failure (or node failure) in the network is the path protection scheme, which establishes an active path and a link-disjoint (or node-disjoint) backup path, so that in the event of a link failure (node failure) on the active path, data can be quickly re-routed through the backup path. We consider a dynamic scenario, where requests to establish active-backup paths between a specified source-destination node pair arrive sequentially. If a link-disjoint (node-disjoint) active-backup path pair can be found at the time of the request, the paths are established; otherwise, the request is blocked. In this scenario, at the time a request arrives, not every fiber link will have all W wavelengths available for new call establishment, as some of the wavelengths may already have been allocated to earlier requests and communication through these paths may still be in progress. We assume that the network nodes do not have any wavelength converters. This paper studies the existence of a pair of link-disjoint (node-disjoint) active-backup paths satisfying the wavelength continuity constraint between a specified source-destination node pair. First we prove that both the link-disjoint and node-disjoint versions of the problem are NP-Complete. Then we focus on the link-disjoint version and present an approximation algorithm and an exact algorithm for the problem. Finally, through our experimental evaluations, we demonstrate that our approximation algorithm produces near-optimal solutions in almost all of the instances of the problem in a fraction of the time required by the exact algorithm.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE INFOCOM
Pages524-535
Number of pages12
Volume1
StatePublished - 2004
EventIEEE INFOCOM 2004 - Conference on Computer Communications - Twenty-Third Annual Joint Conference of the IEEE Computer and Communications Societies - Hongkong, China
Duration: Mar 7 2004Mar 11 2004

Other

OtherIEEE INFOCOM 2004 - Conference on Computer Communications - Twenty-Third Annual Joint Conference of the IEEE Computer and Communications Societies
CountryChina
CityHongkong
Period3/7/043/11/04

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture

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