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WDM网络中静态路由和波长分配的随机搜索算法研究（英文版）.docx

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WDM网络中静态路由和波长分配的随机搜索算法研究（英文版） ResearchonRandomSearchAlgorithmofStaticRoutingandWavelengthAssignmentinWDMNetworks Abstract Withtheincreasingdemandforhigh-speedandhigh-capacitytransmissioninnetworkcommunication,WavelengthDivisionMultiplexing(WDM)technologyhasbecomeapopularsolutionforovercomingthebottleneckoflimitedbandwidth.However,theeffectivemanagementofthenetworkbecomesmoredifficultduetothecomplexityofroutingandwavelengthassignment(RWA)inWDMnetworks.Inthispaper,weproposeanovelrandomsearchalgorithmforRWAinWDMnetworks.Theproposedalgorithmutilizestheconceptofcrossoverandmutationtoexplorethesolutionspaceeffectively.Simulationresultsdemonstratethattheproposedalgorithmcanachieveagoodbalancebetweentheoptimizationofnetworkperformanceandthecomputationalcomplexity,anditoutperformstheexistingRWAalgorithmsintermsofblockingprobabilityandnetworkutilization. Keywords:WDMnetwork,routing,wavelengthassignment,randomsearchalgorithm,crossover,mutation,blockingprobability,networkutilization 1.Introduction WavelengthDivisionMultiplexing(WDM)hasbeenwidelyusedinopticalfibercommunicationsystemsduetoitscapabilityoftransmittingmultipleopticalsignalssimultaneouslyoverasinglefiber.Asaresult,thecapacityoftheopticalfibercommunicationsystemscanbegreatlyimproved.However,thehighbandwidthcapacityofWDMnetworksalsointroducesnewchallengesinnetworkmanagement,especiallyinroutingandwavelengthassignment(RWA)[1].TheRWAprobleminWDMnetworksaimsatfindingapathfordatatransmissionandassigningasuitablewavelengthtoeachdataflowsothatthenetworkperformancecanbeoptimized[2]. Thetraditionalstaticanddynamicroutingalgorithms,suchasshortestpathroutingandlink-staterouting,arenotapplicabletoWDMnetworksduetotheirspecificcharacteristics,suchaswavelengthcontinuityconstraintandwavelengthnon-overlappingconstraint[3].Therefore,manyresearchershaveproposedvariousRWAalgorithmsbasedonheuristicandmeta-heuristicapproachestosolvethisproblem.However,theexistingalgorithmsstillfacechallenges,includinghighblockingprobability,lownetworkutiliz