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