optical network magazine 1 routing algorithms in wdm networks under mixed static and dynami

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1、OPTICALNETWORKMAGAZINE1RoutingAlgorithmsinWDMNetworksunderMixedStaticandDynamicLambda-TrafficGuidoMaierCoreComViaColombo81-20131Milan,Italy(maier@corecom.it)AchillePattavinaDepartmentofElectronicsandInformation(DEI),PolitecnicodiMilanoPiazzaLeonardodaVinci32-20133

2、Milan,Italy(pattavina@elet.polimi.it)LuigiBarbatoCoreCom(tluibar@corecom.it)FrancescaCeciniCoreCom(Francesca.Cecini@rsisistemi.it)MarioMartinelliCoreCom;DEI,PolitecnicodiMilano(martinelli@corecom.it)AbstractDynamictrafficisbecomingimportantinWDMnetworks.Inthetrans

3、itiontowardsfulldynamictraffic,WDMnetworksoptimizedforaspecificsetofstaticconnectionswillmostlikelyalsobeusedtosupporton-demandlightpathprovisioning.OurpaperinvestigatestheissueofroutingofdynamicconnectionsinWDMnetworkswhicharealsoloadedwithhigh-priorityprotectedst

4、aticconnections.Bydiscrete-eventsimulationwecomparevariousroutingstrategiesintermsofblockingprobabilityandweproposeanewheuristicalgorithmbasedonanoccupancycostfunctionwhichtakesseveralpossiblecausesofblockingintoaccount.Thebehaviorofthisalgorithmistestedinwell-kn

5、owncase-studymeshnetworks,withandwithoutwavelengthconversion.Moreover,Poissonianandnon-Poissoniandynamictrafficsareconsidered.F.CeciniisnowwithRSISistemi,AltranGroup,CorsoStatiUniti,29-10129Torino,Italy.OPTICALNETWORKMAGAZINE2KeywordsWavelengthDivisionMultiplexing

6、,dynamictraffic,routingalgorithmsI.INTRODUCTIONHEpastfewyears(upto2001)witnessedtheflourishingoftelecommunicationindus-tryasoneofthefastest-growingandmostwide-spreadphenomenaineconomyeverTrecorded.ThecoreofthattechnologicalrevolutionhasbeenWavelengthDivisionMultipl

7、exing(WDM)opticalnetworks,withtheiruniquecapabilitytoofferthebestsolutiontothelargebandwidthdemandononesideandtoguaranteehighqualityofserviceandhighreliabilityontheotherside.ThankstothesefeaturestheareaofapplicationsofWDMnetworksdrasticallyexpandedfromtheoriginal

8、voicetraffictransporttobecomeacommonhighspeedtransportplatformcarryingdata,videoandvoice.WDMprotocolhasbeendevelopedinordertooperateinanintegratedmulti-protocol