网优文档52：LTE Power Control & Power Setting(NSN)

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1、PowerControlLTERadioParametersRL25TD1©NokiaSiemensNetworksRA47007EN25GLA0Contents1.LTEFunctionalities&FeaturesOverview2.ParametersStructure&SIBs3.PhysicalChannelConfiguration&RandomAccess4.UEStateHandling5.BearerManagement6.AdmissionControl7.PowerControl&PowerSettin

2、g8.AdaptiveModulation&Coding9.MIMOModeControl10.IdleModeMobility11.ConnectedModeMobility12.Scheduler13.SON3©NokiaSiemensNetworksRA47007EN25GLA0ModuleContents•Overview•UL-PC:Overview•UL-PC:PUSCH•UL-PC:PUCCH•UL-PC:ControlScheme•UL-PC:ClosedLoop•DL-PC:RL25TD•DL-PC:PCon

3、PDCCH•GracefulCellShutdown5©NokiaSiemensNetworksRA47007EN25GLA0OverviewObjectiveImprovecelledgebehaviour,reduceinter-cellinterferenceandpowerconsumption.Downlink(DL)DL‘Semi-static’PowerSetting•eNodeBgivesfixedpowerdensityperPRBscheduledfortransport.–TotalTxpowerisma

4、x.whenallPRBsarescheduled–Noadaptive/dynamicpowercontrol–(O&Mparameter)CellPowerReductionlevelCELL_PWR_RED[0...10]dBattenuationin0.1dBstepsDLPowerControlonPDCCHdlCellPwrRedReductionofDLTxpower;deductedfrommax.antennaTXpower.LNCEL;0..10;0.1;0dBUplink(UL)SlowUplinkPow

5、erControl•CombinationofopenloopPCandclosedloopPC•OpenLoopPowerControl(OLPC)–CalculatedattheUEbasedonpathlossmeasurements•ClosedLoopPowerControl(CLPC)–BasedonexchangeoffeedbackdataandcommandsbetweenUEandeNodeB–SW-licensedenhancement(canbeswitchedonandoff)6©NokiaSieme

6、nsNetworksRA47007EN25GLA0ModuleContents•Overview•UL-PC:Overview•UL-PC:PUSCH•UL-PC:PUCCH•UL-PC:ControlScheme•UL-PC:ClosedLoop•DL-PC:RL25TD•DL-PC:PConPDCCH•GracefulCellShutdown7©NokiaSiemensNetworksRA47007EN25GLA0UL-PC:OverviewLTE:orthogonalULTx,i.e.near-far-problemmu

7、chlessseverethanWCDMA•UL:dynamic,slowPC–OpenLoop(OL)&ClosedLoop(CL)•needforPL/shadowingetc.compensationOLPC•needforcorrection/adjustmentsofe.g.openloopinaccuraciesCLPCSignalstrengthS:DependsonPL,indoorlossetc.,i.e.locationLowHighInterference(I)-maincause:inter-ce

8、llNoise(N)=kBTDf+NFeNBPowercontroldoesnotcontroltheabsoluteUETxpowerbutthePowerSpectralDensity(PSD),powerperHz,foradevice.ThePSDsattheeNod