(19) umts irat handover analsysis _ ja-chang ma - academia222
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UMTS iRAT Handover Analsysis
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ApplicationPaper: iRATHandoverAnalysis
iRATHOAnalysis
In the iRAT 3G-2G Handover Matrix different panes/chapters are used to
displaythedata.Mainchaptersare:
1. iRAT3G-2GHandoverMatrix
2. CellRadioParameters(3Gcellsonly)
3. MobilityIndicators(for2Gcellonly)
Afteracarefullycasestudyof3G-3Grelocationsscenariositwasdecidedthat
a matrix view of 3G-3G relocations (inter-RNC hard handover) does not
providemeaningfulresults,because
theseproceduresareratherrareintodaysnetwork,
in RelocationResourceAllocationthesourcecelloftheHOcannotbe
identified
in RelocationPreparationfor3G-3GHOthetargetcellIDcannotbe
identified(onlyLACissignalinginTargetID)
incaseoffailuresintheseproceduretheexistingdashboardKPIsfor
HOAnalysisand RANAPAbnormalIu-ReleaseRatioprovidesufficient
failureindicatorsandallowfulltroubleshootingworkflowincludingdrill-
downtocalldetails.
Sincebestcorrelationresultsareexpectedwithcellinformationprovidedby
operators the import of a combined 2G/3G cell info f ile is required as
prerequisiteforthematrixalgorithms.
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ApplicationPaper: iRATHandoverAnalysis
iRAT3G-2GHandoverMatrix
The iRATHO 3G-2GHandoverMatrix consists of several sections that are
describedbelow:
SourceCell3G
Figure7.SourceCell3G
ThisistheunambiguousidentityofthesourcecellwheretheUEreceivesthe
HOCommand.
Inthe RANAPInit.Mgs.forRelocationPreparation theSACofthesourcecell
isfoundtogetherwiththeglobalcellID(GCI)ofthetargetID.Inthematrix
theseIDsaredisplayedassourcecell= RNC-ID+LAC+SAC(whereRNC-ID
isderivedfromtopologyorcellinfofile).
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Figure8.MessageExample1.SourceandtargetID
Cell name, uARFCN and Primary Scrambling Code (Primary SC) are also
derivedfromcellinfofile.
iRATHandoverAnalysis
Targe t Cel l 2G2G Cel l Ident it y and Rad io Qua li ty before 3G-2G
Handover
Figure9.TargetCell2G
In this section the cell global identity is shown as derived from Init.Mgs.
RelocationPreparation=LAC+CI.
TheBCCHARFCNaswellasBCCandNCCbelongtoatargetTRXofa2G
cell and are found in RRC Measurement Control and DMTAP Handover
Command(HCOM).(Refertothefigurebelow.)
Figure10.MessageExample2:RRCMeasurementControlforiRATmeasurements
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iRATHandoverAnalysis
The general relation between TRX (identified by BCCH ARFNC, BCC and
NCC)andCGI(cell)isshowninthefigurebelow.
Figure11. GeneralRelationbetweenTRXandCGI
TheinterRATCellID fromRRC MeasurementControl isoftenusedtoindicate
the verified BSIC (BCC+NCC) in RRC Measurement Report. (See Figure
12.Messageexample3.)
>>>Bandindicator MP Enumerated(DCS
1800bandused,PCS1900band
used)
Indicateshowto
interprettheBCCHARFCN
>>>BCCHARFCN MP Integer(0..1023) [45]
BSC
TRX0
TRX1
TRX2
TRX3
TRX255
Cell1
Cell2
Celln
BTS1
BTSm
Report Work
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iRATHandoverAnalysis
+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +| I DName | Comment or Val ue |+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
| 4999 2: 53: 38 PM, 991,846 6-RRC-I UB RLC/ MAC AMDATADCH RRC_DCCH_UL measur ementRepor t
| TS 25. 331DCCH- UL - V5.9. 0( RRC_DCCH_UL) measurement Report ( = measurement Report ) || uL-DCCH- Message || 1 i nt egri t yCheckI nf o || 1. 1messageAut hent i cat i onCode | ' 1f9185f 3' H || 1. 2 r r c- MessageSequenceNumber | 1 || 2 message || 2. 1 measurement Repor t || 2. 1. 1measurement I dent i t y | 11 || 2. 1. 2measuredResul t s || 2. 1. 2. 1 i nt er RATMeasur edResul t sLi st || 2. 1. 2. 1. 1 i nt erRATMeasuredResul t s || 2. 1. 2. 1. 1. 1gsm || 2. 1. 2. 1. 1. 1. 1 gSM- MeasuredResul t s || 2. 1. 2. 1. 1. 1. 1. 1 GSMCarr i erRSSI | 74 dBm + SCALE t o 73dBm + SCALE || 2. 1. 2. 1. 1. 1. 1. 2bsi cRepor t ed || 2. 1. 2. 1. 1. 1. 1. 2. 1veri f i edBSI C | 0 || 2. 1. 2. 1. 1. 1. 2 gSM- MeasuredResul t s || 2. 1. 2. 1. 1. 1. 2. 1 GSMCarr i erRSSI | 85 dBm + SCALE t o 84dBm + SCALE |
| 2. 1. 2. 1. 1. 1. 2. 2bsi cRepor t ed || 2. 1. 2. 1. 1. 1. 2. 2. 1veri f i edBSI C | 2 |
| 2. 1. 2. 1. 1. 1. 3 gSM- MeasuredResul t s || 2. 1. 2. 1. 1. 1. 3. 1 GSMCarr i erRSSI | 86 dBm + SCALE t o 85dBm + SCALE || 2. 1. 2. 1. 1. 1. 3. 2bsi cRepor t ed || 2. 1. 2. 1. 1. 1. 3. 2. 1veri f i edBSI C | 3 || 2. 1. 2. 1. 1. 1. 4 gSM- MeasuredResul t s || 2. 1. 2. 1. 1. 1. 4. 1 GSMCarr i erRSSI | 94 dBm + SCALE t o 93dBm + SCALE || 2. 1. 2. 1. 1. 1. 4. 2bsi cRepor t ed || 2. 1. 2. 1. 1. 1. 4. 2. 1nonVeri f i edBSI C | 51 || 2. 1. 2. 1. 1. 1. 5 gSM- MeasuredResul t s || 2. 1. 2. 1. 1. 1. 5. 1 GSMCarr i erRSSI | 95 dBm + SCALE t o 94dBm + SCALE || 2. 1. 2. 1. 1. 1. 5. 2bsi cRepor t ed || 2. 1. 2. 1. 1. 1. 5. 2. 1nonVeri f i edBSI C | 65 || 2. 1. 3 event Resul t s || 2. 1. 3. 1 i nt er RATEvent Resul t s || 2. 1. 3. 1. 1 event I D | e3a || 2. 1. 3. 1. 2cel l ToReport Li st || 2. 1. 3. 1. 2. 1cel l ToReport || 2. 1. 3. 1. 2. 1. 1bsi cReport ed |
| 2. 1. 3. 1. 2. 1. 1. 1ver i f i edBSI C | 0 || 2. 1. 3. 1. 2. 2cel l ToReport || 2. 1. 3. 1. 2. 2. 1bsi cReport ed || 2. 1. 3. 1. 2. 2. 1. 1ver i f i edBSI C | 2 || 2. 1. 3. 1. 2. 3cel l ToReport || 2. 1. 3. 1. 2. 3. 1bsi cReport ed || 2. 1. 3. 1. 2. 3. 1. 1ver i f i edBSI C | 3 |
Figure12.MessageExample3:RRCMeasurementReportwithiRATmeasurementresults
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