GSM测量讲解.ppt

MEASUREMENTSANDMEASUREMENTPROCESSING BSSPARS9 MEASUREMENTSContents 1 CodingLevelandQuality2 MSMeasurementsinIdleMode3 MSMeasurementsinDedicatedMode MEASUREMENTSCodingofLevelandQuality LEVEL QUALITY P dBm FS dBuV m LEV 110270 109281 108292 498861 488962 479063 BER BER QUALRANGEMEAN12 818 17 900MHz P PowerFS FieldStrengthLEV Level BSC BSC MEASUREMENTSMSMeasurementsinIDLEMode GSMSpecs MShastodecodeBCCHofserving camped cellevery30sMShastodecodeBCCHofadjacentcellsatleastevery5minPre synchronizationandBSIC decodingofneighboursOncein30sListof6bestneighboursisupdatedevery60sNewneighbourBCCHdecodingin30s MEASUREMENTSMSMeasurementsinDEDICATEDMode 1 MeasurestheLevandQualoftheServer DetectswhetherDTXisused 26 FRAMEMULTIFRAME120ms TDMAFRAMES TCH SACCH IDLE MeasurestheBAfrequencies SystemInfo5 BSICdecodingofatleastoneneighbour Pre SynchronizationonSCH TDMAFRAME4 615ms SACCHPERIOD 480ms RX TX RX TX RX TX MEAS MEAS MEAS MEASUREMENTSMSMeasurementsinDEDICATEDMode 2 GSMspecs Pre synchronizationandBSIC decodingofadjacentcellsOncein10sNewneighbour5sdecodingBSIC Pre synchronizationIfnotsuccesfull Oldneighbourlist NewtryMeasurementresultsof6bestneighbourswillbesenttoBSCEverySACCHperiod480msec MEASUREMENTPROCESSINGContents 1 Pre ProcessinginBTS2 AveragingandSampling3 DTXandWeighting4 ProcessinginBSC5 Bookkeeping6 ParametersrelatedtoMeasurementsandMeasurementProcessing MEASUREMENTPROCESSINGGeneral Measurements BtsMeasAverage AveragingWindowSizeAdjCellAllAdjacentCellsAveragedNumberOfZeroResults Averaging Averaging Bookkeeping ho pc Averaging Lev Qual UL DLWindowSizeWeightmsDistanceAveragingParameterWIndowSizeDTXMode Measurements Handover EnaFastAveCallSetupEnaFastAvePCEnaFastAveHO MS BTS MS BSC btsMeasAver1 4 SACCHPeriod ParameterValue MEASUREMENTPROCESSINGPre processinginBTS ForMSandBTSmeasurementsAveragemeasurementsover1 2 3or4SACCH periodCauseadelay btsMeasAver 1 x480msReduceatransmissionloadandaprocessingloadinBSCNeededinAbisinterfacewhen16kbitsignalingisusedwithhalfrate MEASUREMENTPROCESSINGAveragingandSampling HoThresholdLevDL 33 77dBm WindowSize 5 Weighting 1Px 3 Nx 4btsMeasAver 1 nopre processinginBTS 30 25 50 35 45 40 15 20 10 480ms AVERAGE 40 P 0 AVERAGE 35 P 0 AVERAGE 30 P 1 AVERAGE 25 P 2 AVERAGE 20 P 3 Handoverattempt ho pc Averaging Lev Qual UL DLWindowSize 1 32Weight 1 3msDistanceAveragingParameterWIndowSize 1 32 ParameterValue MEASUREMENTPROCESSINGFastAveraging NOKIATELECOMMUNICATIONS DLpowercontrol RR DLhandover RR DLpowercontrol RR DLhandover RR a Newmethod S6 b Oldmethod 0 HO PCthresholdnottriggered1 HO PCthresholdtriggered Oldtriggeredthresholds TriggeredthresholdsafterPC MEASUREMENTPROCESSINGFastAveraging 2 Averagingwindowsizefull size 4 23 27 26 24 27 24 27 1 27 23 2 27 23 26 24 4 27 23 26 3 whentheaveragingwindowisfull anormalslidingwindowtechniqueisusedasintheexample 23 26 24 27 4 26 24 27 24 4 NOKIATELECOMMUNICATIONS AveragingstartedwithavailablesamplesLevelmeasurementsscaledafteraPCcommandSeparatelyonULandDL EnaFastAveCallSetupY NEnaFastAvePCY NEnaFastAveHOY N ParameterValue MEASUREMENTPROCESSINGVariousWindowSize usedwithMSspeeddetection LengthofaveragingwindowsizeischangedaccordingtoMSspeedinformation Fastmobilehasshortavaragingwindowsize mobilesmayhandovertotargetcellfasterSlowmobilehaslongavaragingwindowsize msSpeedDetectionState0 hobetweenmacro microlayer1 100 thescalingfactorforaveragingwindowsize 4 2 Scalingis50 MSSpeedDetectionStateParameter TheBSCmayusetheinformationonthespeedofthemobilestationtodothefollowingbymeansoftheparameterMsSpeedDetectionState 0MSspeedinformationisusedtocontroltrafficbetweenseparatelayersofthemulti layeredcellularnetworkbymeansofthehandoverprocedure 1 100MSspeedinformationisusedtoscalethevaluesoftheaveragingparameters Therangeisfrom1 to100 Thatis ifthevalueis forexample 80 itmeansthattheaveragingwindowis80 ofthenormalwindowsize AV RXLEV UL PC 2x35 1x42 2x352 1 2 2 1 1 1 2 36 MEASUREMENTPROCESSINGDTXandWeighting DTXisallowedjustonTCHDTXisusedonlyforspeechcalls SUB measurementresultsareusedwhenDTXisused Sample 12345678DTXused 01001110uplinklevel 3542333639403935 ExamplepcAveragingLevULwindowSize 8weighting 2 DTXMode0MSmayuseDTX1MSshalluseDTX2MSshallnotuseDTX ParameterValue Example allAdjacentCellsAveraged NonumberOfZeroResults 2WindowSize 8 Sample MEASUREMENTPROCESSINGBook keeping BSCisabletomaintainupto32lastmeasurementresultsof32adjacentcellsMobilereportstoBSC6bestresultsandtherestare0 110dBm ZeroResultscanbeeliminatedfromaveraging upto7 Alladjacentcellscanbeaveragedorjust6best reportedbythemobileinthelastmeasurements averagingWindowSizeAdjacentCells1 32numberOfZeroResutlts0 7allAdjacentCellsAveragedY N ParameterValue MEASUREMENTPROCESSINGParametersRelatedtoMeasurementsandMeasurementProcessing btsMeasAver1 4 SACCHPeriod ParameterValue ho pc Averaging Lev Qual UL DLWindowSize 1 32 SACCHPeriod Weight 1 3msDistanceAveragingParameterWIndowSize 1 32 SACCHPeriod EnaFastAveCallSetupY NEnaFastAvePCY NEnaFastAveHOY N DTXMode0MSmayuseD