毕业论文-光传输网性能优化与仿真研究

武汉工程大学邮电与信息工程学院毕业设计（论文）光传输网性能优化与仿真研究学生姓名学号专业班级指导教师2013年5月摘要随着电信业市场的竞争日益加剧，促使电信经营者越来越关注网络质量和安全。传输网络是保障整个网络质量的基础，经过多期大规模建设和扩容，网络中存在的问题逐渐显示出来，网络优化成为提高网络质量的唯一途径。对现有传输网络进行优化，就是在现有传输网络上进行数据采集和评估分析，通过深入分析网络现状和业务模型，从承载业务类型及流量模式和带宽分配、网络资源利用、网络安全、光纤和管道资源风险、维护故障分析等诸多方面，提出优化整改方案。从而达到以下目的（1）提高网络资源利用率；（2）增加网络容量，解决网络瓶颈问题；（3）使之承载的业务更丰富；（4）提高网络的安全性，降低维护成本；（5）使管理更为便捷。本论文在讨论网络性能优化的必要性以及网络优化实施方案的基础上，探讨了传输网络性能优化的关键问题，包括对网络结构、同步方案、网络生存性和多业务支持能力的优化；随后以某地传输网为例，分析了其在网络结构、同步方案、网络生存性和网管系统现状等方面存在的问题，明确了了对网络性能进行优化的基本思路并提出了可行的优化改造方案。通过网络性能仿真研究，表明优化后的网络容量、资源利用率和多业务能力得到显著的提高，网络服务质量得到改善，可满足当前和未来五年内的业务发展需求。关键词光传输网；性能优化；性能仿真；自动交换光网络ABSTRACTTHECOMPETITIONINTHETELECOMMUNICATIONMARKETHASBECOMEMOREANDMOREFIERCE,WHICHCAUSEARESULTTHATTHESERVICEPROVIDERPAYMOREATTENTIONTOTHEQUALITYANDTHESECURITYOFTHENETWORKTHETRANSMISSIONNETWORKISTHEFOUNDATIONOFTHEWHOLECOMMUNICATIONNETWORK,BUTDUETOTHEMASSCONSTRUCTIONEARLIER,THESHORTCOMINGSAREGETTINGMOREANDCLEARER,ANDTHENETWORKOPTIMIZATIONISTHEONLYWAYTOSOLVETHEPROBLEMOPTIMIZATIONONTHEEXISTINGTRANSMISSIONNETWORKISTOESTIMATEANDANALYZECOLLECTIONDATAONTHENETWORKBYINDEPTHANALYSESONCURRENTNETWORKARCHITECTUREANDSERVICEMODEL,ITPUTSFORWARDANENTIREOPTIMIZATIONSOLUTIONONASPECTSOFBORESERVICETYPES,TRAFFICMODEL,BANDWIDTHALLOCATION,NETWORKRESOURCEEFFICIENCY,NETWORKSECURITY,OPTICFIBERANDCHANNELRESOURCERISKSASWELLASMAINTENANCEANDFAULTANALYSESTHESOLUTIONSETTLESTHEFOLLOWINGISSUES1ADVANCINGNETWORKRESOURCEEFFICIENCY2INCREASINGNETWORKCAPACITYFORITSBOTTLENECK3ENRICHINGTHEBORESERVICETYPES4IMPROVINGNETWORKSECURITYANDDECREASINGMAINTENANCECOST5MAKINGNETWORKMANAGEMENTMORECONVENIENTBASEDONTHEDISCUSSIONOFNECESSITYOFNETWORKPERFORMANCEOPTIMIZATIONANDEMPLOYMENTSCHEMEOFNETWORKOPTIMIZATION,THISTHESISFIRSTSTUDIEDONTHEKEYISSUESABOUTNETWORKOPTIMIZATION,INCLUDINGOPTIMIZATIONOFNETWORKSTRUCTURE,SYNCHRONOUSSCHEME,NETWORKSURVIVABILITYANDCAPABILITYOFMULTISERVICESUPPORTINGTHEN（略）TECHNOLOGIESAFTERNETWORKOPTIMIZATION,ANDTHERESULTSSHOWTHATTHEINDEXESMEETTHEREQUIREMENTSOFPRESENTANDFUTURE5YEARSKEYWORDSOPTICALTRANSMISSIONNETWORKPERFORMANCEOPTIMIZATIONPERFORMANCESIMULATIONASONAUTOMATICSWITCHEDTRANSPORTNETWORK目录第1章绪论111国内外光传输网发展现状及趋势112本论文的研究内容1第2章某地光传输网的现状及存在的问题分析221光缆及管道现状222网络与业务负荷现状3221核心层传输系统现状3222汇聚层传输系统现状4（略）第6章总结与展望5参考文献6致谢7附录主要英文缩写语对照表8第1章绪论传输网是为各类业务网提供业务信息传送手段的基础设施，是通信网的重要组成部分，传输网的好坏直接制约着通信网的发展。现在各运营商的本地传输网经过近几年的快速发展已初具规模，为各项业务的开展提供了必要的通道，但也存在着一些问题。本章对国内外光传输网的发展现状及趋势作了介绍，通过分析目前光传输网存在的问题，提出了光网络优化的必要性。同时对本课题的研究目的、意义、主要内容及创新点作出了说明。11国内外光传输网发展现状及趋势新一代电信传输网，是电信传输网络发展的一个新的阶段，是以多波长光传输为主要手段、以IP业务为主要传输业务（在相当长时间内是IP业务和TDM业务共存）、以ASON为目标的智能光传输网络。它是下一代电信网络的重要组成部分，能够以其高度智能、高度开放、高度生存性一高度可管理性来支撑下一代电信网。基于SDH的多业务传送节点（简称MSTP），在SDH原有的TDM业务接入和交叉连接的基础上，增加了ATM、以太网等数据业务的接入、交换、统计复用和传送等功能，并提供多种业务接口和统一的网络管理能力的多业务节点。国外也将MSTP称为多业务提供平台（MULTISERVICEPROVIDINGPLATFORM，MSPP）。MSTP通过将传输层和数据链路层甚至网络层功能集成在一个设备中，并进行优化设计，功能上相当于现有的“SDHATM交换机（或以太网交换机）”，在一个机架内包括SDH的ADM/DXC功能、以太网交换机、ATM交换机等多种功能1。12本论文的研究内容（下文略）第2章某地光传输网的现状及存在的问题分析网络评估作为网络优化的第一步，工作范围包括通过对原有网络进行数据采集、现场检查，并对网络组网合理性、业务发展需求进行掌握和分析，同时和客户保持双向沟通，良性互动，提出适合客户网络发展的优化建议。本次光网络评估优化重点是通过对网络资源和组网的评估，通过一系列的指标的比较，对全网进行详细的了解和把握，找出其中存在的瓶颈和风险点，并在此基础上提出切实可行的网络优化实施方案，为网络的后期发展、优化提供全面、系统的数据参考。某地移动本地网主要为GSM/GPRS移动基站提供2M电路服务，另外提供一些企业、网吧等大客户接入、内部办公自动化、营业厅计费等服务、以及少量机房监控等通道服务。整个网络中心交换机房主要是电信局机房和移动公司机房，两个节点完成了除少数大客户接入外的所有业务终结。而且由于移动基站建设的渐进性，每个接入环，并且绝大部分接入节点的业务通道都向到两个中心节点开放。21光缆及管道现状某地传输网拓扑图如图21所示。STM16STM4B1B2B3B4B5C4C1C3STM16A1A2C2图21某地传输网拓扑图经过前期的大力建设，某地传输网已经敷设G652光缆共计145153公里；通信管道集中在市区，共建6536公里，具体情况如表21所示。其存在的问题主要为部分光缆存在较长距离的架空，部分郊区光缆直埋较浅，网络安全性存在很大的隐患；存在汇聚层和接入层混用一条光缆的情况，由于接入层需要经常增加节点，网络调整频繁，若在施工中出现问题，会导致汇聚层的瘫痪。表21某地传输网光缆状况统计表（单位KM）光缆芯数直埋架空管道总计813613612568568165865658652324986986364674789546340378378484584587合计1306665878914515依据ITUT建议G957的最坏值计算法2，光功率的计算为（21）0MIAGP（下文略）22网络与业务负荷现状221核心层传输系统现状某地传输网络，由核心层、汇聚层和接入层三部分组成。核心层由两端25G设备组成，用于VC4及VC4级别以上业务的调度。汇聚层中，环B为25G两纤复用段保护环，主要承载B2、B3、B4至核心节点B1、B5BSC间的电路，为本地汇聚系统；环C为622M两纤复用段保护环，主要承载城区各BTS至核心节点C1BSC间的电路，为本地汇聚系统。该网络就充分体现了集中汇聚型业务的特点。接入层以155M设备为主，接入层的电路业务全部进行集中汇聚到中心业务站点，这样可以较为方便的实现网络业务的及时开通和拓展。其中A1、B1和C1在一个机房，A2和B5在一个机房，按照分层的概念把上述网络分为三个层次进行分析1网络资源利用率A1到A2之间系统最大容量可满足两节点间开通16STM1，目前己开通6个632M电路，系统资源占用率375,冗余度625。（1）汇聚层节点的选择。一般依据地理区域的分布或行政区域的划分将本地传输网分为若干个汇聚区，选择一些机房条件好、业务发展潜力大、可辐射其他节点的站点设置汇聚点。建议以县（包括县级市）为汇聚区，在县辖区内选择重点镇作为汇聚点；（2）汇聚环上节点数量的调整，节点数不宜太多，一般为46个；（3）汇聚层可以采用2纤或4纤的复用段保护环或通道保护环，传输速率建议为25GBIT/S或10GBIT/S。对于平均分配的业务，可以采用2纤或4纤的复用段保护环。如果有汇聚型的业务，则2纤通道保护环在业务配置和调度、保护倒换等方面都比复用段保护环简单和容易，更适合在汇聚型的业务中使用13。2网络存在的问题核心层所承载的电路主要是MSC,BSC间的电路，现已开通378个2M电路。从系统承载的电路类型看，对系统安全性的要求极高，从系统的保护方式及冗余度看，日前网络的安全性处于优良状态，但是，由于所承载电路的重要性，仍要考虑在其他层面提供本系统的备份路由，以更好的保证所承载电路的安全性。222汇聚层传输系统现状（下文略）第6章总结与展望本文对某地传输网的现状和存在的问题从网络结构、网络同步和网管系统方面进行了分析研究，针对某地传输网的实际需求，制定了适合当地传输网优化建设的方案，分析结果表明，本地传输网优化方案很好的解决了本地传输网的实际问题。本论文完成的主要工作有（1）在明确网络优化的概念的基础上，对网络的拓扑结构、同步、生存性和对多业务的支持等网络优化中的关键问题进行了讨论和分析；（2）以某地传输网为例，针对现有网络在拓扑结构、资源利用率、时钟同步和网管系统方面存在的问题，阐明了进行网络性能优化的必要性，并提出了可行的优化改造方案；（3）对优化后的网络性能进行了仿真研究，表明优化后的网络容量、资源利用率和多业务能力得到显著的提高，网络服务质量得到改善。本论文还存在以下不足，对于网络性能的探讨仅以业务质量、即误码率作为衡量的指标，而未探讨光层的性能，如光功率、波长以及光信噪比等。此外，随着对多业务平台开发和研究的进一步深化，多业务平台的智能化也被提到议事日程上来，而本文对网络的智能化未作深入探讨。参考文献12345（略）致谢时间飞逝，大学的学习生活很快就要过去，在这四年的学习生活中，收获了很多，而这些成绩的取得是和一直关心帮助我的人分不开的。（略）附录主要英文缩写语对照表缩略语中文全称英文全称ADM分插复用器ADD/DROPMULTIPLEXERASON自动交换光网络AUTOMATICSWITCHEDTRANSPORTNETWORKBITS大楼综合定时供给BUILDINGINTEGRATEDTIMINGSUPPLYDXC数字交叉连接DIGITALCROSSCONNECTMSTP多业务传送平台MULTISERVICETRANSPORTPLATFORMSDH同步数字体系SYNCHRONOUSDIGITALHIERARCHYSTM同步传送模块SYNCHRONOUSTRANSPORTMODULE为你提供优秀的毕业论文参考资料，请您删除以下内容，O_O谢谢ALARGEGROUPOFTEAMERCHANTSONCAMELSANDHORSESFROMNORTHWESTCHINASSHAANXIPROVINCEPASSTHROUGHASTOPONTHEANCIENTSILKROAD,GANSUSZHANGYECITYDURINGTHEIRJOURNEYTOKAZAKHSTAN,MAY5,2015THECARAVAN,CONSISTINGOFMORETHAN100CAMELS,THREEHORSEDRAWNCARRIAGESANDFOURSUPPORTVEHICLES,STARTEDTHETRIPFROMJINGYANGCOUNTYINSHAANXIONSEPT19,2014ITWILLPASSTHROUGHGANSUPROVINCEANDXINJIANGUYGURAUTONOMOUSREGION,ANDFINALLYARRIVEINALMATY,FORMERLYKNOWNASALMAATA,THELARGESTCITYINKAZAKHSTAN,ANDDUNGANINZHAMBYLPROVINCETHETRIPWILLCOVERABOUT15,000KILOMETERSANDTAKETHECARAVANMORETHANONEYEARTOCOMPLETETHECARAVANISEXPECTEDTORETURNTOJINGYANGINMARCH2016THENTHEYWILLCOMEBACK,CARRYINGSPECIALTYPRODUCTSFROMKAZAKHSTANASMALLARTTROUPEFOUNDEDSIXDECADESAGOHASGROWNINTOAHOUSEHOLDNAMEINTHEINNERMONGOLIAAUTONOMOUSREGIONINTHE1950S,ULANMUQIRARTTROUPEWASCREATEDBYNINEYOUNGMUSICIANS,WHOTOUREDREMOTEVILLAGESONHORSESANDPERFORMEDTRADITIONALMONGOLIANMUSICANDDANCESFORNOMADICFAMILIESTHE54YEAROLDWASBORNINTONGLIAO,INEASTERNINNERMONGOLIAANDJOINEDTHETROUPEIN1975HESAYSTHEREARE74BRANCHTROUPESACROSSINNERMONGOLIAANDACTORSGIVEAROUND100SHOWSEVERYYEARTOLOCALNOMADICPEOPLE“ICANSTILLRECALLTHEDAYSWHENITOUREDWITHTHETROUPEINTHEEARLY80SWESATONTHEBACKOFPICKUPTRUCKSFORHOURSTHESKYWASBLUE,ANDWECOULDNTHELPBUTSINGTHEFOLKSONGS,“NASUNSAYSTHEVASTNESSOFINNERMONGOLIAANDTHELACKOFENTERTAINMENTOPTIONSFORPEOPLELIVINGTHERE,MADETHEIRLIVESLONELY“THENOMADICPEOPLEWEREVERYEXCITEDABOUTOURVISITS,“NASUNRECALLS“WEDIDNTHAVEAFORMALSTAGETHEAUDIENCEJUSTSATONTHEGRASSUSUALLY,THEPERFORMANCESBECAMEABIGPARTYWITHLOCALPEOPLEJOININGIN“FORHIM,THEREWARDINGPARTABOUTTOURINGISNTJUSTABOUTSHARINGARTWITHNOMADICFAMILIESBUTALSOABOUTGAININGINSPIRATIONFORTHEMUSICANDDANCEULANMUQIRLITERALLYTRANSLATESAS“REDBURGEON“,ANDTODAYSPERFORMERSOFTHETROUPESTILLTOURTHEREGIONSVILLAGESANDENTERTAINNOMADICFAMILIES,BUTTHEIRFAMEHASSPREADAROUNDTHEWORLDONMAY16AND17,NEARLY100SINGERSANDDANCERSFROMTHETROUPEPERFORMEDATBEIJINGSPOLYTHEATERTHEIRSHOW,TITLEDULANMUQIRONTHEGRASSLAND,DEPICTEDTHEHISTORYANDDEVELOPMENTOFTHEARTTROUPE“BEINGFROMTHEREGIONALLOWEDMETOEMBRACETHECULTUREOFINNERMONGOLIAANDBEINGAMEMBEROFTHETROUPESHOWEDMEWHEREIBELONGED,“NASUN,THEARTTROUPESPRESIDENT,WHOISALSOARENOWNEDTENOR,TELLSCHINADAILYDURINGATOURIN1985,HEWENTTOAVILLAGEANDMETANELDERLYLOCALMAN,WHOTOLDHIMASTORYABOUTHISFRIENDSHIPWITHASOLIDERFROMSHENYANG,CAPITALOFNORTHEASTCHINASLIAONINGPROVINCE,DECADESAGOTHESOLIDERGAVETHEOLDMANAHANDMADESADDLEWHENTHEYBIDFAREWELLTHESTORYINSPIREDNASUNTOWRITECARVEDSADDLE,ASONGTHATLATERBECAMEONEOFHISMOSTPOPULARNUMBERSNOW,EVERYYEAR,NASUNRECRUITSYOUNGSINGERSANDDANCERSFORTHETROUPETHETROUPEHASALSODESIGNEDANEWREPERTOIRE,WHICHISMOSTLYBASEDONTHEDAILYLIVESOFMONGOLIANPEOPLE,ESPECIALLYTHELIVESOFNOMADICFAMILIES,ANDHASCOMBINEDCONTEMPORARYMUSICALELEMENTSWITHFOLKSONGSOFTHEREGIONHAIMU,A25YEAROLDKHOOMEIALOCALVARIANTOFOVERTONESINGINGSINGER,JOINEDTHETROUPETHREEYEARSAGOALONGWITHASIXMEMBERBAND,HEPERFORMSFASTSONGSANDSOFTONESTHATHEWRITESALLWHILEPLAYINGTHEHORSEHEADFIDDLE“ALTHOUGHILEARNEDTHEPIANOSINCECHILDHOODANDGREWUPLISTENINGTOVARIOUSKINDSOFMUSIC,TOME,THEFOLKMUSICOFINNERMONGOLIAISTHEROOT,“HESAYS“PERFORMINGINREMOTEVILLAGESISPLEASANTIFEELATHOMEONTHEBOUNDLESSGRASSLANDS,ANDTHEWARMPEOPLETHEREMAKEMEFEELFULFILLED“THEFIRSTROUNDOFSPRINGAUCTIONSEASONINBEIJINGENDEDLASTWEEK,BUTITFAILEDTOCREATEMUCHSPRINGINTHEARTMARKETALTHOUGHTWOPIECESOFCHINESEPAINTINGFETCHEDMORETHAN100MILLIONYUAN,THEDECLINEINTRADINGVOLUMEANDSALERATESHOWEDADOWNTURNTHISYEARINTHE“GRANDVIEWCHINESEPAINTINGHIGHLIGHT”SESSIONATCHINAGUARDIAN2015SPRINGAUCTIONS,PANTIANSHOUSREPRESENTATIVEWORKEAGLE,ROCKANDFLORAHITARECORDAUCTIONPRICEOF279MILLIONYUAN,WHILELIKERANSMASTERWORKJINGGANGMOUNTAINFETCHED1265MILLIONYUAN,ANUNEXPECTEDHIGHINRECENTYEARSHOWEVER,THETRADINGVOLUMEFELLSTO187BILLIONYUANFROM222BILLIONYUANINTHESAMEPERIODTHEYEARBEFORETHEHUANGCHEN2015SPRINGAUCTIONS,WHICHRECORDED425MILLIONYUANINTOTALSALES,EXPERIENCEDTHESAMETHESECTIONNUMBERWENTDOWNTO5FROM12COMPAREDTOLASTYEARACCORDINGTOEXPERTSHAOJIANWU,THEARTMARKETDIDNOTATTRACTMUCHEXCITEMENTTHISYEARDUETOTHEBOOMINGSTOCKMARKETANDTHEPERSISTENTPROBLEMSOFFORGERYANDFAKEDEALSTHETWOPIECESOFCHINESEPAINTINGNOTCHEDUPHIGHPRICETHISSPRINGDUETOTHEIROWNVALUENOTDUETOAREVIVALINTHEMARKET“THESUCCESSFULTRANSACTIONOFTWOWORKSWITHAHAMMERPRICEOFMORETHAN100MILLIONYUANONCEAGAINCONFIRMSTHATVALUABLEANDRAREWORKSOFHIGHQUALITYALWAYSEARNTHELONGLASTINGHIGHPRICECHINESEPAINTINGANDCALLIGRAPHYISSTILLTHEPILLAROFTHEMARKETHOWEVER,THEOVERALLSALESRATEHASDROPPEDSLIGHTLY,WHICHREFLECTSTHEDEMANDFORTHEORDINARYAUCTIONGOODSHASWEAKENED,”SAIDTHEPRESIDENTOFCHINAGUARDIANSHUYANYAN“BESIDES,THEENTRYOFNEWBUYERSALSOMAKESCERTAINCHANGESTOTHEDIRECTIONOFPURCHASINGINAWORD,THEOVERALLMARKETTRENDISVERYUNPREDICTABLEALTHOUGHCHINAGUARDIAN2015SPRINGAUCTIONSHASACHIEVE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