WDM光网络中的路由和波长分配算法研究

《WDM光网络中的路由和波长分配算法研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、西南交通大学硕士学位论文WDM光网络中的路由和波长分配算法研究姓名：刘凤洲申请学位级别：硕士专业：通信与信息系统指导教师：潘炜20070501西南交通大学硕士研究生学位论文第Ⅱ页AbstractWitllthedevelopmentofnetworkingtechnologiesandnewservicesofinternet．thereisanexplosivegrowthtrendininteracttraffic，whichispromotingtheconstructionofbroadband

2、backbonenetwork．WavelengthDivisionMultiplexing(WDM)isapromisingapproachthatCanUSetheenormousbandwidthoftheopticalt胁er．Asinglefibercanbeemployedformultipledatastreamssimultaneously．All·opticalnetworksemployingtheconceptofWDMRreconsideredasthetransportnetw

3、orksforthefuture．AkeyissueinnetworksdesignistooptimizeRoutingandWavelengthAssignment(RWA)forlightpaths．RWAsolveshowtofredoutallappropriatelightpathandassignawavelengthreasonablyinordertomakefulluseofthelimitedresourceandprovidecommunicationcapabilityasla

4、rgeaspossible．Inthisthesis，firstly,thebasicconceptionsandexigingalgorithmsforRWAproblemaleintroduced．Secondly，bycomparingandanalysisingtheexpressionofoptimizingobjectofseveralclassicalwavelengthassignmentalgorithms，improvedtherelativecapacityinfluencealg

5、orithmwhichisthebestonblockingprobabilityperformancenowundertheconditionofnowavelengthconverte墙．Anewlinkcostdefinitionstrategyisalsobeproposedandtheeffectofroutingselectionalgorithmaccordingtothenewlinkcostdefinitionstrategyandtheimprovedwavelengthassign

6、mentalgorithmareevaluedjointlybysimulation．Thirdly,trafficpriorityandfairnessofnetworkalestudied，apriority-basedwavelengthassignmentalgorithmandotheralgorithminwhichpriorityandfairnessaleconsideredintegretilyareproposed．Thesetwoalgorithmimprovedthedyn锄ic

7、thresholdalgorithmfromdifferentangles．Sothey西南交通大学硕士研究生学位论文第1II页c龇decreasetheblockingprobabilityandfittheQoSconstraints．TheproposedRWAalgorithmsinthisthesiscanachievelowerblockingprobabilitythansomealgorithmsexistedinliteraturesandsupportprioritiesoftraf

8、fic．Thealgorithmcanimprovethefairnessofnetworksbyincreasingtheblockingprobabilityofshorterhoplightpathsanddecreasingtheblockingprobabilityoflongcrhoplightpaths．KeyWords=WDMOpticalNetworks；RoutingandWavelengthAssignment；Lin