(19) UMTS IRAT Handover Analsysis _ Ja-Chang Ma - Academia222

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9/5/2015 (19) UMTS iRAT Handover Analsysis | Ja-Chang Ma - Academia.edu

https://www.academia.edu/7177641/UMTS_iRAT_Handover_Analsysis

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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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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+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +| 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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