通信工程毕业设计的论文外文翻译TDCDM与WCM络优化分析.docx

通信工程毕业设计的论文外文翻译TDCDM与WCM络优化分析.docx

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通信工程毕业设计的论文外文翻译TDCDM与WCM络优化分析

毕业设计（论文）外文参考资料及译文

译文题目：

TD-SCDMA与WCMA网络优化分析

　　　　　3Gnetworkoptimization

学生姓名：

学　　号：

专　　业：

通信工程

所在学院：

龙蟠学院

指导教师：

职　　称：

讲师

2011年12月1日

说明：

要求学生结合毕业设计（论文）课题参阅一篇以上的外文资料，并翻译至少一万印刷符（或译出3千汉字）以上的译文。

译文原则上要求打印（如手写，一律用400字方格稿纸书写），连同学校提供的统一封面及英文原文装订，于毕业设计（论文）工作开始后2周内完成，作为成绩考核的一部分。

3Gnetworkoptimization

摘自TD-SCDMA无线网络优化原理及方法

One,thebasicprocessof3Gnetworkoptimization

Operatorsaimistobuildaprofitablenetwork,theyareveryconcernedaboutthenetworkconstruction,expansionandupgradeintheprocessofinvestmentcostanditsfinalperformance,buttheexpansion,upgradecostsandnetworkperformanceisapairofcontradiction.Constructioncostbudgetandcontrolcangetrelativelyaccuratenumerical,buttheperformanceofthenetworkiscomposedofmanysubjectiveandobjectivefactors.Ononehand,thenetworkcapacityexpansion,upgradingandupgradestoexistinguserscanguaranteethenormaluse,ontheotherhand,italsocanprovidecompetitivenewbusiness,andmakesfurtherexpansion,upgradingandupgradescanbecarriedoutsmoothly.Inthisway,thenetworkoptimizationbecomesalong-term,iterativeprocess.

Networkoptimizationshouldbeabletoaccordingtotheoperator'sspecificneedsbymeansofsoftwaretoolautomatically,canalsothroughmanualinterventiontoachievethecapacity,coverage,QoSensureabalancepoint.3Gnetworksystemstructureisshowninfigure1.Generally,networkandincludes3levels:

OnNodeB,themobilestationperformanceindicatorsforreal-timecalculationandsimulation,includingfastpowercontrol,rapidcongestionresolved,wirelesslinkadaptive,channelallocation;

Realtimeloadanalysisandcontrol;

Basedonexperienceorstatisticalresults,throughroadshow,networkoptimizationsoftwarefornetworkperformanceprediction.

Infrontof2levels,inthenetworkiscompleted,bythenetworkmanagementsystemthroughtheonlinemonitoringandstatisticsinrealtimeautomaticadjustment,whilethethirdlevelistheneedforprofessionalstocarryout,alsoisweoftensaythatthenetworkoptimization.

Artificialnetworkoptimizationcanbedividedintothefollowingseveralsteps:

Firstofall,theoperatorshouldbebasedontheirowncharacteristicsthedefinitionofagoodnetworkoptimizationiscompletedtoachievethegoal,whichdeterminetheabovementioned"balancepoint",includingpoint-to-pointqualityobjectives,differentbusinesstypesofperformanceindicatorsandrelatedKPI（keyperformanceindicators）ofvariousvalues;later,theexistingnetworkperformanceindexdataacquisition,throughavarietyofchannels,suchasnetworkmanagementsystemandtheconvergencedevicefeedback,protocolanalyzersandevenmaintenancedepartmentcustomercomplaintssuchassummary,inconclusion,shouldbethroughavarietyofways,usingavarietyofmeans,collectingmoredata,theanalysisresultisaccurate.

Thecollecteddataisinputtothenetworkplanningsoftwareanalysis,cangeneratethecurrentnetworkstatus,orachievesomeindexesareneededfornetworkconfiguration.Intheprocessofsystemsimulation,someresultsintheinitialanalysisiscomplete,theerrorwillberelativelylarge,atthistime,someparametersarefine-tuned,localiterativeanalysisofsystem,itwasrepeatedlymodified,willeventuallygetaccurateresults.

Networkoptimizationtoachievethepurposeofincluding:

improvingnetworkcoverage,reducethesystemcalldroprate,lossrate,improvetheswitchingsuccessrate,onNodeBloadadjustment,optimizationofNodeBpilotfrequencydistribution.Optimizationofindicatorsinclude:

NodeBsectortransmissionpower,antennaheightandangle,theadjacentNodeBpositionandthepilotsignal,theadjacentNodeBpilotsearchwindowsize,triggerswitchthresholdvalue.

Intheprocessofnetworkoptimization,weneedtousedifferenttools,andthesetoolshavedifferenteffects.

1planningsoftware

Indetailsimulationprocess,wewillbeneworexpansion,upgradingthesiteinformationinputtotheelectronicmap.Throughrepeatedsimulationandtuning,resultinginsomeconstraints（suchassitelocation,determiningfixedconfiguration）,optimalcoverage,capacity,qualityofserviceindicators.Landuseplanningsoftwareoptimizationstage,throughthesimulationtodeterminethesystemfactorsinclude:

NodeBsite,typeofantenna,antennaangle.Onthebasisoftheexistingnetworkexpansion,upgrade,theoperatorisalwaysconcernedwithoptimizationiscompleted,thenewcapacitycanachievethesimulationpredictedvalue.

2networkmanagementsystem

Networkmanagementsystemistomonitornetworkperformance,thesystemdataacquisition.Itcanbeshownthatthedistributionbusiness,thebusinesssuchasthequalityofcalllossratestatistics,therefore,canhelpthemaintenanceengineerforfaultlocation.

QoSindexesarerelativelyflexible,accordingtoKPIrequirementsorcostcontrolrequirements,canbeidentifiedinthecorrespondingQoSindex.Theconstraintsinclude:

hardwareresources（channelcapacityconfiguration）,softwareresources（interferencecaps）,calllossrate,droppedcallrate,callrate,handoversuccessrate,theuplink/downlinkchannelload,dataretransmission/delay,dataandcircuittypebusinessrateetc..Tomeettheserequirements,networkmanagementsystemshouldhavethefollowing3functions:

（1）monitoringnetworktrafficandperformance;

（2）real-timefaultdetectionandrapidpositioning,inordertoimprovethequalityofservice;

（3）automaticallycollected,aggregateddatarequiredfornetworkplanning.

3simulationtoolsoftware

Aimingattheexistingnetworkoperation,throughthespecializedtestsoftwaretools,wecandrawsomeareaorthewholenetworkperformance,throughsimulationanalysissoftware,thevariousindicatorsofclassificationstatistics,networkoptimizationengineertodoadetailedassessmentoftheoverallnetworkperformance.Analysissoftwarethroughthenetworkaccesstowirelesslinkindex,totalco-channelinterference,andstatisticalanalysis.Someofthesedataisrandom,suchasamobilestationtoareceivinglevelvalue,receiving/transmittingpower.Whilesomeotherindicatorsarestatic,suchasswitchingtime,switchingrateofsuccess,thestatisticalanalysisoftheresultscanhelpthenetworkoptimizationengineerontheexistingnetworkconditionshaveaclearunderstanding,andtargetedfornetworkoptimization.

Networkplanningandoptimizationisarepeatedoperation,accordingtotheactualsituationandneeds,whicharetheoreticallyanalyzedandcalculated,andthroughthepracticeofrepeatedlycorrecting.

Intwo,WCDMAandTD-SCDMAnetworkoptimizationofsimilaritiesanddifferences

Ingeneral,theconfigurationofhardwaredesignandplanningandproductparametershavedirectrelation,suchasaradiolinkantennagain,isolation,basebandsignalelectricequality.Thisaspectoftheplanninganddesigntotheantennaazimuth,pitchangle,heightetc..Radioresourcemanagement（RRM）includesswitchingcontrol,powercontrol,control,loadcontrolandsoon.Andaccordingtothedifferentbusinessmodel,channelmodeandsystem,designandoptimizationsoftwaretousedifferentalgorithms.For3Gsystem,3kindsofinternationalstandard,inthebusinessmodel,channelmodelofthetwoisexactlythesame,butthesystemindifferentwirelessmodulation,differentphysicallayertechnologydeterminesthedifferentradiopropagationmodel.

TheTD-SCDMAand3GPPrecommendedbytheother3Gstandards,technicaldifferencesreflectedinthesmartantenna,jointdetection,uplink/downlinksynchronization,specialframestructureetc..Therefore,networkplanningandoptimizationwithothersysteminthereferencemodelisslightlydifferent,andamongthem,thesmartantennaisintroducedtoanalysisresult.

Therefore,fortheTD-SCDMAsystem,networkoptimizationmoreshouldconsiderthechannelallocationalgorithm,intelligentantennaindicatorfeatures.Below,weontheTD-SCDMAandWCDMAoptimizationinseveralwaysarecompared.

The1switch

Switchdesignforeachmobilecommunicationnetworkareveryimportant.Fromcybersourceuseefficiencyperspective,mobilestationnotinthebestbusinesssector,largelyinfluencethequalityofthebusiness.Forexample,aNodeBpilotsignalistoostrong,aroundthemobilestationwilloftenswitchtothesector,causingtheNodeBwirelessresourcesareoccupied,thesystemloadistoolarge,willincreasetheareaofthedroprate,atthesametime,areaoftheinterferencesbetweenmobilestationswillincrease.

InthesystemofWCDMA,samefrequencyswitchingusingsoftswitching（soft/softerhandoff）manner,inTD-SCDMA,istheuseofrelayswitching（BatonHandover）,whichisakindofhardswitchingandsoftswitchingbetweenaswitchingmode.TD-SCDMAisalsooneofthecoretechnologiesinmobilecommunicationsystem.Itsdesignconceptistheuseofsmartantennaanduplinksynchronizationtechnology,themobilestationdistanceandazimuthpositioningbasedonmobilestation,accordingtothebearinganddistanceinformationasauxiliaryinformationtodeterminewhetherthemobilestationmobiletobeswitchedbetweenadjacentNodeBneighborhood.Ifthemobilestationenterstheswitchingregion,RNCnotifiestheNodeBtoswitchtoprepare,soastoachieverapid,reliableandefficientswitchingpurposes.Thisprocessisatrackandfieldcompetitionintherelayracerelaybaton,figuregroundsaysforrelayswitch.Relayswitchwithintelligentantennaanduplinksynchronizationtechnology,softswitchinghighsuccessrateandhardswitchinghighchannelutilizationtogether,isagoodsystemperfo