gsm-umts cell reselection and handover

USER DESCRIPTION 208/1553-HSC 103 12/14 Uen A

UserDescription,GSM-UMTSCellReselectionandHandover

Copyright

CopyrightEricssonAB,2008.AllRightsReserved.

Disclaimer

Nopartofthisdocumentmaybereproducedinanyformwithoutthewrittenpermissionofthecopyrightowner.

Thecontentsofthisdocumentaresubjecttorevisionwithoutnoticeduetocontinuedprogressinmethodology,designandmanufacturing.

Ericssonshallhavenoliabilityforanyerrorordamagesofanykindresultingfromtheuseofthisdocument.

Trademark List

Ericsson isatrademarkownedbyTelefonaktiebolagetLMEricsson.

AllotherproductorservicenamesmentionedinthisUserDescriptionaretrademarksoftheirrespectivecompanies.

Contents

1 Introduction1.1 General1.2 ReadersGuide1.3 MainChangesinEricssonBSS08A1.4 MainChangesinEricssonBSS08B1.5 MainChangesinEricssonBSS09A2

Capabilities

3

Technical Description

3.1 General3.2 Measurements3.3 Inter-RATfunctions3.4 RelatedStatistics4

Engineering Guidelines

4.1 Multi-RATMSCapabilities4.2 SystemInformation4.3 CellReselectiontoUMTS4.4 Intersystemcellselectionaftercallrelease4.5 InterSystemHandover5

Parameters

5.1 General5.2 MainControllingParameters5.3 ValueRangesandDefaultsValues6

Concepts

Glossary

Page 1 of 34User Description, GSM-UMTS Cell Reselection and Handover

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Reference List



1 Introduction

1.1General

ThisuserdescriptiondescribesanumberoffeaturesrelatedtohandoverbetweenGSMandUMTS.ThefeaturesdescribedareGSM-UMTSCellReselectionandHandover,SmoothGSMtoWCDMAUnloading,HandoverwithUsageofServiceIndicator,CombinedCellReselectionTriggeringGSMtoWCDMA,CombinedHandoverTriggeringGSMtoWCDMAandOptimizedthroughputatGSMtoWCDMACellChange(basedonNC2).

ThefeatureGSM-UMTSCellReselectionandHandoverallowsend-userswithMulti-RAT(RadioAccessTechnology)GSM/WCDMAMobileStationstoroambetweenUTRAN(UMTSTerrestrialRadioAccessNetwork)andGSMradioaccessnetworkwithoutlossofservice(providedtheserviceissupportedinbothnetworks).Itgivessupportformobilityinidlemode(GSMtoUTRAN),forhandoverofcircuitswitchedconnections(GSMtoUTRAN),andforcellreselectionforpackedswitchedservice(GPRS/EGPRStoUTRAN).

ThefeatureSmoothGSMtoWCDMAUnloadinghelpsassuringresourceavailabilityinGSMcellsandlimitshandoverloadathighloadsituations.

ThefeatureHandoverwithUsageofServiceIndicatorgivessupportforservicebasedhandovers,whichmeanstheMSCcangivepreferencetowhichradioaccessnetworktouseforaconnection,GSMorWCDMA.TheServiceIndicatorisusedbytheBSCwhendecidingonCShandoverfromGSMtoWCDMA

ThefeatureCombinedCellReselectionTriggeringGSMtoWCDMAprovidesthepossiblitytodefineathresholdforCPICHRSCPmeasurementstobeusedatcellreselection.ThethresholdforCPICHRSCPmeasurementsassuresasufficientdownlinksignalstrength,whichinturnincreasesthepossiblityforthemobiletoreachthenetworkintheuplink.

ThefeatureCombinedHandoverTriggeringGSMtoWCDMAprovidesthepossibilitytodefineaCPICHRSCPthresholdusedtocontrolthemeasurementreportingofUTRANcellsforMSsbeinginconnectedmodeorforMSsbeinginNC2mode.NoUTRANcellswillbeincludedinthemeasurementreportsfromtheMSunlessthenonreportingradioentity(CPICHRSCP)haveavalueabovethedefinedCPICHRSCPthreshold.

ThefeatureOptimizedthroughputatGSMtoWCDMACellChangeimprovesend-userperformancebypreventingacellreselectionfromaGSMcelltoaWCDMAcellwhichinsomeinstancescanhaveoutagetimesof10|20secondsontheend-userapplicationlevel.

ThisdocumentonlydescribestheBSSfunctionality,notUTRANparts,ofcircuitandpacketswitchedintersystemcellreselectionandhandover.OnlyWCDMAFDD(FrequencyDivisionDuplex)issupported.

ThefeatureFastReturntoWCDMAafterCallReleaseisintroducedtodecreasethePagingOutageTime.Withthefeaturemulti-RATmobilescanberequestedtoselectaWCDMAcelldirectlyafterthecallreleaseandhencepreventingthemobiletofirstselectaGSMcellandthenre-selectaWCDMAcell.

ThefeatureQueuingofWCDMACallsinBSSmakesitpossibletoprovideenhancednetworkaccessibilityinGSMtoprioritizedsubscriberscomingfromtheWCDMAnetworkviathedirectedretryprocedure.

1.2ReadersGuide

ThisdocumentdescribestheGSMandUMTSinterworkingfromaBSSperspective.UMTSdetailscanbefoundinthedocumentationdescribingtheWCDMARadioAccessNetworkproduct.



1.3MainChangesinEricssonBSS08A

Nochanges.

1.4MainChangesinEricssonBSS08B

Nochanges.

1.5MainChangesinEricssonBSS09A

ThefeatureQueuingofWCDMACallsinBSShasbeenintroduced.ThefeatureFastReturntoWCDMAafterCallReleasehasbeenintroduced.

2Capabilities

WiththefeatureGSM-UMTSCellReselectionandHandover,anoperator(ortwooperators)ofbothaGSMandaUTRANsysteminanareacanusethesenetworkstocomplementeachother.Forexample,thealreadybuiltoutcoverageofGSMcanbeused,sothatend-userswithMulti-RATMSswillexperiencegoodcoveragealsoinareaswherethereisnoUTRANcoverageusingtheUMTStoGSMcellreselectionandhandoverfunctionality.Thiswillincreasetheserviceperceivedbyend-usersaswellasthecombinednetworkcapacity.

WiththefeatureHandoverwithUsageofServiceIndicator,thefeatureGSM-UMTSCellReselectionandHandoverisextendedwithamechanismthatenablestheMSCtoaffectwhichradioaccessnetwork,GSMorWCDMA,preferablyshallserveaCSconnection.

WiththefeatureSmoothGSMtoWCDMAUnloading,thefeatureGSM-UMTSCellReselectionandHandoverisextendedwiththepossibilitytolimitthemaximumnumberofhandoverstoperformpersecondtoUTRAN.OnlythenumberofhandoversthataretriggeredbecauseofhightrafficloadintheGSMcellarelimited.Furthermore,incominghandoversfromUTRAN,willberejectedincaseofhightrafficloadintheGSMcell.ThesemechanismshelpstoassuretheresourceavailabilityintheGSMnetwork.

WiththefeatureCombinedCellReselectionTriggeringGSMtoWCDMA,cellreselectionisimprovedtodecreasethenumberofping-pongcellreselections.ThatisachievedbyaddingathresholdforCPICHRSCPmeasurementstoassureasufficientdownlinksignalstrength,whichinturnincreasesthepossiblityforthemobiletoreachthenetworkintheuplink.

WiththefeatureCombinedHandoverTriggeringGSMtoWCDMA,theIRAThandoverbehaviourisimprovedbyavoidinghandoverattemptstoweakUTRANcells.ThatisachievedbyaddingareportingthresholdfornonreportingradioentityoftheUTRANcells.SinceCPICHEc/NoisthereportingradioentitythenonreportingradioentityisCPICHRSCP.AnMSwillonlyincludeaUTRANcellinthemeasurementreportsincasetheCPICHRSCPvalueoftheUTRANcellisabovethedefinedthresholdvalue.ThisassuresthatUTRANhandovercandidateshaveasufficientdownlinksignalstrength,whichinturnincreasesthepossiblityforthemobiletoreachthenetworkintheuplink.

WiththefeatureOptimizedthroughputatGSMtoWCDMACellChange,end-userperformanceisimprovedforGPRS/EDGE/WCDMAsubscribers.Inparticular,thisfeaturereducestheimpactondownloadtimesbyprohibitingacellreselectionfromaGSMcelltoaWCDMAcell,andthusavoidingthelongoutagetimes,whenanMSisinpackettransfermode.

WiththefeatureFastReturntoWCDMAafterCallRelease,thePagingoutagetimecanbedecreasedsincethemulti-RATmobilescanberequestedtoselectaWCDMAcelldirectlyatthecallreleasewhichpreventsthemobiletofirstselectaGSMcellandthenre-selectaWCDMAcell.




3TechnicalDescription

3.1General

ThefeatureGSM-UMTSCellReselectionandHandoverprovidesthebasicmechanismsforhandoverandcellreselectionfromGSMtoUMTS.Parameterscanbesettocontrolwhenamulti-RATMSinidleorconnectedmodeshallstartmeasuringonUTRANcells,seeSection3.2.AUTRANcellwillonlybeconsideredasacandidateforcellreselectionorahandoverifthesignalqualityinthetargetcellisgoodenough.PrioritizingofUMTSorGSMcanbecontrolledbyseveralparameters.CellreselectionandtheoptionalfeatureCombinedCellReselectionTriggeringGSMtoWCDMaredescribedinSection3.3.2.Forhandover,thetrafficloadoftheGSMcellcaninadditiontotheradiocriteriabeusedasacriterionforhandoverstowardsUMTS,seeSection3.3.4.

WiththeoptionalfeatureCombinedHandoverTriggeringGSMtoWCDMAitisfurtherpossibletocontroliftheMSshallincludeUTRANcellsinthemeasurementreportssenttothenetwork.OnlyUTRANcellswithCPICHRSCPvaluesaboveagivenCPICHRSCPthresholdwillbeincludedinthemeasurementreports.

IncasetheurgencycriteriaintheGSMcellarefulfilled,seeReference[4],handovertoUTRANmaybetriggeredregardlessofthetrafficloadintheGSMcell.

WiththefeatureHandoverwithUsageofServiceIndicator,thefeatureGSM-UMTSCellReselectionandHandoverisextendedwithamechanismfortheMSCtocontrolinwhichsystem(GSMorUMTS)aconnectionpreferablyshallbeserved.IftheMSCindicatesthataconnectionshallnotbehandedovertoUTRAN,BSSnevertriggersahandovertoUTRAN.IftheMSCindicatesthataconnectionshouldnotbehandedovertoUTRAN,BSSonlytriggersahandovertoUTRANincaseanyurgencycriterionisfulfilledintheGSMcellandwhenthesignalqualityinthetargetcellisgoodenough.IncasetheMSCindicatesthatahandovershouldbeperformed,BSStriggersahandovertoUTRANwhenthesignalqualityinthetargetcellisgoodenough.

WiththefeatureSmoothGSMtoWCDMAUnloading,thefeatureGSM-UMTSCellReselectionandHandoverisextendedwiththepossibilitytolimitthemaximumnumberofhandoverstoperformpersecondtoUTRAN.OnlythenumberofhandoversthatistriggeredbecauseofhightrafficloadintheGSMcellislimited.Furthermore,incominghandoversfromUTRAN,willberejectedincaseofhightrafficloadintheGSMcell.

WiththefeatureOptimizedthroughputatGSMtoWCDMACellChange,end-userperformanceisimprovedforGPRS/EDGE/WCDMAsubscribers.Inparticular,thisfeaturereducestheimpactondownloadtimesbyprohibitingacellreselectionfromaGSMcelltoaWCDMAcell,andthusavoidingthelongoutagetimes,whenanMSisinpackettransfermode.ThisfeatureisbasedonNC2,seeReference[3].

ThefeatureFastReturntoWCDMAafterCallReleaseisintroducedtodecreasethePagingoutagetime.Withthefeaturemulti-RATmobilescanberequestedtoselectaWCDMAcelldirectlythecallreleaseandhencepreventingthemobiletofirstselectaGSMcellandthenre-selectaWCDMAcell.




3.2Measurements

BesidesmeasurementsonsurroundingGSM/GPRS/EGPRScellsaMulti-RATMSalsoperformsmeasurementsonUTRANneighbouringcells.ThesemeasurementsareperformedinadifferentwaythanforGSMcellsandmaybelessfrequentlythanmeasurementsonGSM.IngeneralUTRANmeasurementsaredoneduringsparetime,thatis,GSMmeasurementshavepriorityandUTRANmeasurementsaredoneifthereistimeleft.

InordertoreduceunnecessarymeasurementsandtooptimizeMulti-RATMSbatteryconsumption,theGSMnetworkcontrolswhenthemeasurementsonUTRANcellsshallbeperformedwiththeparametersQSIandQSC.TheparametersQSIandQSCdefinethresholdsandalsoindicatewhetherthesemeasurementsshallbeperformedwhenthesignalstrength(SS)oftheservingcellisbeloworabovethethreshold.ItcanbeusedtoavoidunnecessarymeasurementsonUTRANcellsanddoesnotcontrolthebehaviourofMulti-RATMSsintermsofmakingdecisionsforcellreselectionandhandover.QSIisusedforidleandpacketswitchedmodesandbroadcastonBCCHandPBCCH(ifenabled),whileQSCisusedforactivemode,sentonSACCH.

Afterchangingfromidletoactivemode,QSCisnotimmediatelyknown,asitissentonSACCH.Forthatperiodthemeasurementcontrolisdefined,withthecellparameterQSCI,broadcastonBCCH.ItispossibletochoosewhetherUTRANmeasurementswillbeperformedaccordingtotheknownQSIvalue(QSCI=0)oralways(QSCI=1),untilthefirstQSCvalueisread.

Therearefourdifferentscenariostochoosefrom.ParametersQSIandQSCaresetperGSMcellanddefineboththescenarioandthenecessarythreshold,atthesametime:

UTRANneighbouringcellsaremeasuredonlywhenthesignalstrengthoftheGSMservingcellisabovethethresholdsetbyQSIandQSC.

1.

UTRANneighbourcellsaremeasuredonlywhenthesignalstrengthoftheGSMservingcellisbelowthethresholdsetbyQSIandQSC.

2.

UTRANneighbourcellsarealwaysmeasured.3.

UTRANneighbourcellsarenevermeasured.Thiscanbeusedtoturnoffthecellreselection/handovertoUMTS,percell,evenifCOEXUMTSisONfortheBSC.

4.

InordertounderstandthepurposeofQSIandQSC,twoexamplesareshowninFigure1andFigure2.

WhenQSI/QSC=5,UTRANcellmeasurementsareperformedwhentheSSoftheservingGSMcellisbelowthethresholdof-78dBm,seeFigure1.



Figure1ExampleQSI/QSC=5,UTRANMeasurementsArePerformedwhentheSignalStrengthintheServingCellIsbelow-78dBm.

WhenQSI/QSC=11,themeasurementsareperformedwhenthesameSSisabovethethresholdof-66dBm,seeFigure2.

Figure2ExampleQSI/QSC=11,UTRANMeasurementsArePerformedWhentheSignalStrengthintheServingCellIsabove-68dBm.

Example1:IfanUTRANcellshouldservepurelytoextendthecoverageforMulti-RATMSsinGSM,itislogicaltosetQSI/QSCvaluesfrom0-6,sinceit'sonlyneededtomakecellreselectionandhandoverstoUMTSwhentheGSMcoveragefallslow.

Example2:IfanUTRANcellisco-sitedwithaGSMcell,thereisacertaincorrelationbetweensignalstrengthsofthetwosystems.IftheGSMisforexampleusing900MHzbanditisveryprobablethattheGSMsignalstrengthwillalwaysbehigherthantheUTRANsignal,foranumberofdBs.Therefore,thereisnopointinmeasuringUTRANcellsinlowGSMsignalconditionsandvalues8-14canbeselectedaccordingly.

WheninCSactiveorpackettransfermodeaGSM/GPRS/EGPRSMScontinuouslymeasuresthesignalstrengthoftheservingcellandallneighbouringcells(BCCHcarriers)asindicatedintheBAlist.Besides,theGSM/GPRS/EGPRSMSshallattempttodecodetheBSICofasmanyneighbouringcellsbelongingtotheBAlistaspossible,andasaminimumatleastonceevery10secondsduringthesocalledsearchframes.TheMSistypicallyquitebusywithperformingGSM/GPRS/EGPRSmeasurementandthereisnotmuchtimeleftforUTRANmeasurements.Inthiscase,theMSmayperformthemeasurements,oncellsbelongingtothe3Gneighbouringcelllist,duringsearchframesthatarenotrequiredforBSICdecoding.IfindicatedbytheparameterSPRIO,aMulti-RATMSmayuseupto25searchframesper13secondsevenwithoutconsideringtheneedforBSICdecodingintheseframes.ThisimpliesmoretimeforUTRANmeasurements,butinthesamewaylesstimeforBSICdecoding.

3.3Inter-RATfunctions

3.3.1 PLMN Selection

WhenaMulti-RATMSispoweredonoruponrecoveryfromlackofcoverage,itimmediatelyattemptstomakecontactwithaPublicLandMobileNetwork(PLMN).ThePLMNmaybeselectedeitherautomaticallyormanuallysimilartoaGSMonlyMS(seeReference[2]).ThePLMNselectionprocedureissomewhatdifferentforaMulti-RATMSsinceaPLMNcouldsupportmorethanoneaccesstechnology.ItwillfirsttrytoselectandregistertothelastregisteredPLMNifoneexists.AMulti-RATMSstartsitssearchusingthelastusedRAT.If



informationaboutthelastusedRATisnotavailable,theMulti-RATMSstartsitssearchusingGSMaccesstechnology.IfthereisnolastregisteredPLMN,orifitisunavailable,theMulti-RATMSwilltrytoselectanotherPLMNeitherautomaticallyormanuallydependingonitsoperatingmode,seeReference[10].TheautomaticmodeusesalistofPLMNsandRATsinanorderofprioritywhereasthemanualmodeleavesthedecisiontotheend-userandonlyshowstheavailablePLMNsusingallsupportedRATs.

IfaPLMNisselectedusingGSMaccesstechnologythefollowingcellselectionandcellreselectionproceduresaredescribedinReference[2].Multi-RATproceduresinUTRANarenotdescribedinthisdocument.

3.3.1.1AutomaticMode

Inautomaticmode,ifnolastregisteredPLMNexistsorisavailabletheMSwillselectaPLMN,ifitisavailableandallowed,inthefollowingorder:

HomePLMN.TheMulti-RATMSshallsearchfortheHomePLMNusingallaccesstechnologiesitiscapableofandstartitssearchusingthe"accesstechnologiesprioritylist"storedintheSubscriberIdentityModule(SIM).IfnoaccesstechnologyinformationisavailableintheSIMthemobileshallstartitssearchusingGSMaccesstechnology.

1.

EachPLMNinthe"usercontrolledPLMNlist"storedintheSIMinpriorityorder.TheMulti-RATMSshalltryfindeachPLMNusingthe"accesstechnologiesprioritylist"storedforeachPLMNintheSIM.IfnoaccesstechnologyinformationisavailableontheSIMthemobileshallstartitssearchusingGSMaccesstechnology.

2.

EachPLMNinthe"operatorcontrolledPLMNlist"storedintheSIMinpriorityorder.TheMulti-RATMSshalltryfindeachPLMNusingthe"accesstechnologiesprioritylist"storedforeachPLMNintheSIM.IfnoaccesstechnologyinformationisavailableontheSIMthemobileshallstartitssearchusingGSMaccesstechnology.

3.

OtherPLMN/accesstechnologycombinationswithreceivedhighqualitysignalinrandomorder.ForGSMcellshighqualitycellsarecellswithsignallevelabove-85dBm.ForWCDMAcellshighqualitycellsarecellswithCPICHRSCPlevelabove-95dBm.TheMulti-RATMSshallsearchusingallaccesstechnologiesitiscapableofbeforeselectingPLMN.

4.

AllotherPLMN/accesstechnologycombinationsinorderofdecreasingsignalstrength.TheMulti-RATMSshallsearchusingallaccesstechnologiesitiscapableofbeforeselectingPLMN.

5.

3.3.1.2ManualMode

Inmanualmode,theMulti-RATMSwillfirsttrytoselecttheregisteredPLMNorhomePLMNifnolastregisteredPLMNexists.IfthisregistrationfailsoriftheuserhasinitiatedaPLMNreselectiontheMulti-RATMSwillindicatetotheuserallavailablePLMNsusingallsupportedaccesstechnologies.TheusercanthenselectadesiredPLMNwhichcausestheMStoinitiatearegistrationonthisPLMN.IftheselectedPLMNisnotallowed,anindicationtotheusertoselectanotherPLMNwillbegiven.

Note:AnMulti-RATMSmayindicateaccesstechnologytotheuser(manufacturerdependent).IftheaccesstechnologyisnotdisplayedthehighestaccesstechnologyaccordingtotheaccesstechnologyinformationprioritylistintheSIMisused.

3.3.2 Inter System Cell Reselection

3.3.2.1CellReselectiontoGSM

ThereisnosignificantimpactofcellreselectionfromUMTStoGSMontheBaseStationSystem.Ingeneral,cellreselectionfromUMTStoGSM/GPRS/EGPRSisintroducedwithaslittlechangeaspossibletotheGSMstandard.



ThecellreselectionisinitiatedinUTRANandnotdescribedhere.Inshort,foranintersystemcellreselectiontooccurtheestimatedqualityofthecurrentlyusedUTRANfrequencymustbebelowacertainthresholdandtheestimatedqualityofthetargetGSMcellmustbeaboveacertainthreshold.SeeReference[15]foradescriptionofUMTStoGSM/GPRS/EGPRScellreselectioninEricssonWCDMARAN.

WhenaMulti-RATMSmovesintoacellbelongingtoanotherLA/RAatcellreselectionfromUMTStoGSM/GPRS/EGPRSitperformsLA/RAUpdateRequest,whenaccessingtheGSMnetworkusingexistingsignalingprocedurestoindicateitspresenceaccordingtoSection3.3.5andSection3.3.6.ThetargetBSCwillnotdistinguishifthemobilecamefromaGSMorUTRANcellbeforethecellreselection.

3.3.2.2CellReselectiontoUMTS

ThisalgorithmisvalidforMSsinNC0orNC1mode.ForMSsinNC2mode,refertoReference[3].

TobeabletoperformintersystemcellreselectionfromGSMtoUMTS,aMulti-RATMSlistenstoadefinedlistofUMTSneighbours.ThislistisbroadcastonBCCH(andPBCCHifenabled).AsimilaralgorithmtotheoneforGSMcellreselectionisusedforGSMtoUTRANcellreselection.Nevertheless,thereisadifferencewhenitcomestotheevaluationofsignalstrengthandqualityforGSMandUMTSmeasurements.Thereasonforthisisthecompletelydifferentmodulationtechniqueused.Therefore,amappingofUMTSsignalstrengthisperformed,insuchawaythatitcanbecomparedtoGSMsignalstrengthvalues.ThesamealgorithmandbehaviourappliesforintersystemcellreselectioninGPRS/EGPRSReadystate,GPRS/EGPRSStandbystateandCSidlemode.

ThealgorithmforintersystemcellreselectiontoUMTSiscontrolledbythenetworkwiththeparametersFDDQMINandFDDQOFF.

FDDQMINistheminimumqualityofaUTRANcellforcellreselection.Thisparametershouldnotbeusedtocontrolthecellreselection,butprovideasufficientqualityofthecandidateUTRANcell.

FDDQOFFisthekeyparametertocontrolthebehaviourofintersystemcellreselection.ItdefinesanoffsetbetweensignalqualityofUTRANandGSMcells.

LowervaluesoftheparameterFDDQOFFcanbeusedtooff-loadtheGSMsystem.Thismeansthatbothpotentialtraffic(Multi-RATMSsinCSidlemodeandGPRS/EGPRSpacketidlemode)andresourceoccupyingtraffic(Multi-RATMSsinGPRS/EGPRSpackettransfermode)willselectaUTRANcellthatfulfillstheintersystemcellreselectioncriteria.

HighervaluesoftheparameterFDDQOFFcanbeusedtokeepMulti-RATMSsintheGSMsystem,forexampleifanUMTStoGSMoff-loadprioritysettingisappliedintheUMTSsystem.

ThevaluesoftheGSMsignalstrengthandtheUTRANCPICHRSCParenotofthesamekindandthereforenoteasilycomparable.ThebalancebetweenthesetwoshouldbesetwiththeoffsetFDDQOFF.

TheBSSparametersFDDQMINandFDDQOFFmustbesetincorrelationtothecorrespondingUTRANparameterstoavoidunwantedbehaviour,suchas|ping-pong|effect.

NotethatthesettingoftheparameterQSIindirectlyrestrictsthecontrolofcellreselection,sincenocellreselectionwillbemadewithoutUTRANmeasurements.

IfthefollowingcriteriaarefulfilledaMulti-RATcapableMSwillreselectasuitableUTRANcell(seeReference[11]):



CPICHEc/No>FDDQMIN (1)

and

CPICHRSCP>RLA(s+n)+FDDQOFF (2)

foraperiodof5seconds.(s+n=servingandneighbouringGSMcells)

CPICHEc/NoisthereceivedenergyperchipontheCommonPilotChannel(CPICH)dividedbythepowerdensityintheband.ThisquantitymeasuresthequalityoftheneighbouringUTRANcells(roughlycomparabletoasignaltonoiseratiomeasure).Tofulfillthefirstcriterion,itmustexceedthethresholdparameterFDDQMINsetintheBSCandbroadcasttoMulti-RATMSsontheBCCHandPBCCH(ifenabled).

CPICHRSCPisameasureofthesignalstrengthforaUTRANcell.Tofulfillthesecondcriterion,itmustexceedtheRLA(measuredsignalstrength)forboththeservingcellandthe6strongestnon-servingGSM/GPRS/EGPRScellswithanoffsetdefinedbytheparameterFDDQOFF.IfmorethanoneUTRANcellfulfillsthesecriteria,theMulti-RATMSselectstheonewithhighestCPICHRSCP.

RLA(ReceivedLevelAverage)istheaverageofthereceivedsignallevelsmeasuredindBmforallmonitoredGSMfrequenciesintheBAlist.TheaveragingisbasedonatleastfivemeasurementsamplesperRFcarrierspreadover3to5seconds,themeasurementsamplesfromthedifferentRFcarriersbeingspreadevenlyduringthisperiod(seeReference[8]).RLA=RLA_CforGSMattachedMulti-RATMSsandRLA=RLA_PforGPRS/EGPRSattachedMulti-RATMSs.

CellreselectionbacktoUTRANshallnotoccurwithin5secondsafterapreviouscellreselectionfromUTRAN.Ifacellreselectionoccurredwithintheprevious15seconds,anadditionaloffsettoFDDQOFFisincreasedby5dBbythemultiRATMS.

NotethatifthecriteriaforintersystemcellreselectiontoUMTSarefulfilled,theMulti-RATcapableMSreselectsaUTRANcellevenifthecriteriaforselectingaGSM/GPRS/EGPRScellisfulfilled.AGPRS/EGPRSMulti-RATMSusesthesamecellreselectionalgorithminpacketidlemode(noongoingpackettransfer)andinpackettransfermode.

3.3.2.3CombinedCellReselectionTriggeringGSMtoWCDMA

WiththefeatureCombinedCellReselectionTriggeringGSMtoWCDMA,amulti-RATmobilewillreselectaUTRANsuitablecellifcellreselectioncriteria(2),alongwith(3)and(4)belowarefulfilled:

CPICHEc/No>FDDQMIN - FDDQMINOFF (3)

and

CPICHRSCP>FDDRSCPMIN - min((P_MAX-21 dBm),3dB) (4)

Withcriterion(3),therequirementofsignalqualitycanbemadelessrestrictiveformulti-RATmobilesthatsupportssignalstrengthcriterion(4).P_MAXisthemaximumRFoutputpoweroftheMS(dBm)inUTRANFDD.



3.3.2.4OptimizedthroughputatGSMtoWCDMACellChange

ThisfeatureisactivatedbysettingtheparameterNCPROFavalueof1.

ThisfeatureonlyaffectsMSsinpackettransfermodehavingDL/ULTBFwithpayloaddata.ThisfeaturewillnotaffectanMSinDTMmode,i.e.whentheMSisbothinpackettransfermodeandcircuitswitcheddedicatedmode.

Thisfeaturewillengagewhenthefloowingcriteriaarefulfilled:

ThereisatleastoneWCDMAneighbouringcelltotheservingcell.1.

AdownlinkTBFwithpayloaddatahasbeenestablished.2.

TheTBFsession(UL,DLorboth)islongerthan2seconds.3.

ThecurrentRPloadpermitsanotherMSinNC2mode.4.

TheMSisnotinDTMmode5.

FromthetimeatestablishmentofthedownlinkTBFwithpayloaddata,adelaytimeof2secondsisappliedbeforeaffectingtheMSasstatedincriteria(3)above.ThereasontohaveadelayistofilterouttheshortTBFsessionsandtominimizetheloadonthesignallingchannel.

Oncethecriteriaabovearefulfilled,theMSisorderedtoNC2modeandthenetworkcellreselectionalgorithmisinitiated.ThenetworkcellreselectionalgorithmissimilartothecellreselectionalgorithmintheMSasdescribedinReference[8]andSection3.3.2.2andisdescribedmoreindetailinReference[3].

AfteranMSisinstructedtoperformacellreselectiontoanewcell,itisthenorderedtoleaveNC2asdescribedinReference[14].AftertheMShasenteredthenewcell,itwillnotbeabletochangetoanothercellduringthefirst5seconds.DuringthisperiodoftimetheMSmaybeorderedtoNC2againinthenewcellbeforeitcanmakeanydecisionregardingcellchange,forexample,toaWCDMAcell.

3.3.3 Inter system cell selection after call release

WhenthefeatureFastReturntoWCDMAafterCallReleaseisactivated,theBSCmightrequesttheMStoselectaWCDMAcelldirectlyafterthereleasewithoutfirstselectingtheservingGSMcell.ThatisdonebyincludingtheIE"CellselectionindicatorafterreleaseofallTCHandSDCCH"intheCHANNELRELEASEmessage.TheBSCdoesnotindicateanyindividualWCDMAcellbutonlyindicatesthefrequencynumber(s),theUARFCN(s).

IftheGSMcellhasbeenconfiguredwithanActiveUTRANMeasurementFrequencyList,theBSCwilldirectamobiletoUTRANwhenthefollowingcriteriaarefulfilled:1.Thefeatureisactivated2.ThemobileshallnotbecomeaVGCSlistener3.TheparameterQSChasnotbeensetto|never|4.MShasreportedmeasurementsonaUTRANcellwhileindedicatedmode(thereisUTRANcoverage)

TheBSCwillonlyrequestthemobiletoselectafrequencyreportedbythemobileinthemeasurementreport.

IftheGSMcellhasonlybeenconfiguredwithanIdleUTRANMeasurementFrequencyListorQSCissetto|never|,themobilewillnotreportanymeasurementsonUTRANcellsandtheBSCwilldirectthemobiletoUTRANwhenfollowingcriteriaarefulfilled:1.Thefeatureisactivated.2.ThemobileshallnotbecomeaVGCSlistener.3.TheMSisamulti-RATmobile



SincethemobiledoesnotincludeanyWCDMAcellsinanymeasurementwhennoActiveUTRANMeasurementFrequencyListhasbeendefinedortheQSCparameterissetto15(=never),theBSCwillinthiscaserequestthemobiletoselectafrequencyincludedfromtheIdleUTRANMeasurementFrequencyList.

Inthelatterscenario,whenthereisnoActiveUTRANMeasurementFrequencyListortheQSCissetto15(=never),thereisariskthatthemobilewillbere-directedtoWCDMAeventhoughthereisnoWCDMAcoverage.ThemobilewillthenunsuccessfullysearchforWCDMAcellsandafterawhileselectaGSMcell.Insuchacase,thePagingoutagetimewillinsteadincrease.ThereforeitisrecommendedtoturnoffthefeatureinGSMcellswheretheUTRANcoverageispoorandwhennoActiveUTRANMeasurementFrequencyListhasbeenconfigured.

IftheparameterQSIissetto15(=never),meaningthatmobileshouldnotmeasureonWCDMAcellswhileinidlemode,thefeaturecouldbeturnedoffinordertonotrequestthemobiletoselectaWCDMAcell.

ThemobilewillberequestedtoselectaWCDMAcellalsoiftheCSconnectionofaDTMcallisreleased.TheinterruptofthepacketdatatransferwillbeshorterifthemobileinsteadisrequestedtoenterNC2inGSM.WiththeparameterFASTRET3GNC2itispossibletochangethebehaviorsothatthemobileisnotrequestedtoselectaWCDMAcellifthefeatureOptimizedthroughputatGSMtoWCDMACellChangeisactiveandtheCSconnectionofaDTMcallisreleased.

3.3.4 Inter System Handover

3.3.4.1HandovertoGSM

ThebasisforUMTStoGSMhandoverdecisionsisimplementedintheRadioNetworkController(RNC)intheUTRANsystem.ThealgorithmforUMTStoGSMhandoverinitiationinEricssonWCDMARANisdescribedinReference[16].Inshort,thehandovercriterionisbasedonthefollowingevent:estimatedqualityofthecurrentlyusedUTRANfrequencyisbelowacertainthresholdandtheestimatedqualityofthetargetGSMcellisaboveacertainthreshold.

DuringhandoverexecutiontheBSCisinformedviatheMSCthatanintersystemhandoverisrequired.ThetargetBSCallocatesresourcesandorderstheMulti-RATMStoaccessthetargetGSMcellviatheservingRNC.TheBSCwillnotdistinguishbetweenincomingintra-orintersystemhandovers.

WiththefeatureSmoothGSMtoUMTSUnloading,incomingintersystemhandoverswillbetreateddifferently,seeSection3.3.4.4.

3.3.4.2HandovertoUMTS

ThischapterdescribesthebasichandovermechanismprovidedbythefeatureGSM-WCDMACellReselectionandHandover.Thesebasicmechanismismodified/complementedbyotherfeatures,describedinSection3.3.4.3,Section3.3.4.4andSection3.3.4.5.

Incircuitswitchedactivemode(speechanddata),aMulti-RATMSismeasuringneighbouringUTRANcellsandreportingtotheBSSthroughmeasurementreports.TobeabletoperformintersystemmeasurementsalistofUTRANneighboursissenttotheMulti-RATMSontheSACCH.TheselistscanbethesameasthelistbroadcastonBCCHtoMulti-RATMSsinidlemode,butitisalsopossibletosetthemseparatelyinordertohavedifferentUMTSneighboursinidleandactivemode.Afterchangingfromidletoactivemode,thelastlistreceivedoverBCCHisused(thatis,Idle3G-BA),untilanewoneisreceivedoverSACCH(thatis,active3G-BA).TheMulti-RATmobileisinformedonhowmanyUMTScells(0-3)thatshallbereportedinthemeasurementreport.ThisissetbyparameterFDDMRR.BSSinformsthemobilewhichmeasurementreporttouse,MeasurementReportorEnhanced



MeasurementReport.Belowfollowsabriefdescriptionofhowthemobilescomposethedifferentmeasurementreports.

Measurementreporttypeis|MeasurementReport|

WhentheMeasurementReportisused,themulti-RATMSwillcomposethelistasfollows:

1.AddMIN(FDDMRR,numberofvalidUTRANcells)UTRANcellstothetopofthelist.

2.AddMIN((6-numberofaddedUTRANcells),numberofvalidGSMcells)GSMcellstothelist.

3.Ifthereismorespaceinthemeasurementreport,addremainingvalidUTRANcells.

NotethatifmultipleGSM-bandsareused,therewillbefewpositionsinthemeasurementreportforcellsfromthosebands,sinceonlysixcellscanbereportedinthemeasurementreport.FormoreinformationonMultibandoperation,seeReference[6].

AlsonotethatifFDDMRRissetto0andifthenumberofvalidGSMcellsarenotenoughtofillthelist,UTRANcellsmaybereported.

UTRANneighbouringcellsarereportedreusingthefieldsdefinedforGSMneighbouringcellsmeasurements.

ForGSMneighbourcells,theRXLEVfieldisasusualcodedasthebinaryrepresentationofthereceivedsignalstrengthontheneighbouringcell.ForUTRANneighbourcells,theRXLEVfieldisinsteadcodedasthebinaryrepresentationofCPICHEc/No(definedinReference[8]).

ForGSMneighbourcells,theBCCH-FREQfieldisasusualcodedasthebinaryrepresentationofthemeasuredcell'spositionintheBAlist.ForUTRANneighbourcells,theBCCH-FREQfieldisalwayscodedas31(binary).ThismeansthatthemaximumnumberofGSMneighbouringcellsisreducedfrom32to31incellshavingUTRANneighbouringcellsdefined.

AUTRANcellisuniquelyidentifiedwithitsfrequencyandscramblingcodecombinationsothereisnoequivalenttoBSICforGSMcells.InthefieldwhereBSICisusuallyreportedforGSMcells,thebinaryrepresentationofthemeasuredUTRANcell'spositionintheactive3G-BAlistiscoded.

Measurementreporttypeis|EnhancedMeasurementReport|

WhentheEnhancedMeasurementReportisusedthemulti-RATMSwillcomposethelistinthefollowingpriortyorder:

1.Fromservingband,addMIN(3,numberofvalidGSMcells)GSMcellstothelist.

2.Fromeachnon-servingband,addMIN(MBCR,numberofvalidGSMcells)GSMcellstothelist.

3.AddMIN(FDDMRR,numberofvalidUTRANcells)UTRANcellstothelist.

4.IfpossibleaddremainingGSMcellsandUTRANcells.ThecellstoincludeareselectedbytheMS.ThecellsarerankedbycomparingRXLEVforGSMcellswithCPICHRSCPforUTRANcells.

NotethatthereisariskthatthemobilewillnotreportthenumberofUTRANcellsasindicatedbyFDDMRR.HoweverwhenUTRANcellsarereported,theBSCwillalwaysevaluateMIN(FDDMRR,numberofvalidUTRANcells)numberofUTRANcellswhenproducingthefinalhandovercandidatelist.

UponreceivingthemeasurementsfromaMulti-RATMS,theBSCisperformingthelocatingalgorithminordertocreateacandidatelistforhandovers.MeasuredUTRANandGSMcellsareprocessedseparately.ThisisdonebyfilteringouttheUTRANcellmeasurementsbeforeapplyingtheGSMlocatingalgorithm.



TheGSMlocatingalgorithmismodifiedinordertoprocessbothUTRANandGSMneighbouringcells,asshownontheFigure3.

Figure3ModifiedLocatingAlgorithm.MeasurementfromUMTSandGSMCellsAreProcessedSeparatelyandUTRANCellsAreAddedtotheGSMList

TheexistingGSM-GSMlocatingalgorithmiskeptintact.Paralleltothat,aGSM-UMTSalgorithmranksUTRANneighbourcellsandaddspossiblecandidatestothecompletecandidatelist.ForfilteringGSMmeasurements,differentfilterscanbeused,seeReference[4].ForUTRANcellmeasurements,astraightaveragefiltercanonlybeusedwithafixedsetofparameter.

ThekeyparametersthatcontrolhandoversfromGSMtoUMTSareQSCandMRSL.ThefirstparametercontrolswhentheMulti-RATMSshouldmeasureonUMTS-frequencies,thesecondistheUTRANqualitycriterionwhichisvalidatedinBSS.



AllUTRANcellstobeaddedtothecandidatelistmustfulfillthequalitycriterion:

CPICHEc/No>=MRSL (5)

wherethethresholdparameterMRSLissetintheBSC.

Othercriteriathatmustbefulfilledarerelatedtoeitherloadorurgency.AUTRANcellwillbeahandovercandidateonlyifanyorbothoftheurgencyorloadcriteriaarefulfilledinadditiontothequalitycriterion(5).Theurgencycriteriamaybeduetolargetimingadvance,baddownlinkqualityorbaduplinkquality.TheurgencycriteriaaredescribedinmoredetailinReference[4].Theloadcriterionisdescribedbelow.

PercentageofidleTCHintheservingcell

(always),ortovalues8-14ifthecellsareco-sited.ThisisbecausenoGSMsignallevelcriterionisneeded.

Example2:ItisonlywantedtoextendUMTScoveragewithGSM.ISHOLEVshouldbethansetto99inordertoprioritizeUMTSallthetime.BothQSCandQSIshouldbesetto7,or8-14ifthecellsareco-sited. FDDQOFFcanbe-infsinceallMSsaretobethrownbacktoUMTSinidlemodeaswell.

IftheGSMistobeextendedwiththeUMTScoverage,QSChastobeusedasathresholdbelowwhichUTRANmeasurementscanstart.InthatcaseISHOLEVshouldbesetto99.

3.3.4.3HandoverwithUsageofServiceIndicator

WiththefeatureHandoverwithUsageofServiceIndicator,thehandovercriteriaprovidedwithGSM-UMTSCellReselectionandHandoveraremodifieddependingonthevalueoftheServiceIndicator.TheServiceIndicatorisaBSSinternalparameterthatindicateswhethertheMSChasanypreferenceoninwhichsystem,GSMorWCDMA,aCSconnectionshallbeserved.ItwillhavethevalueasreceivedintheInformationElement|ServiceHandover|intheBBSMAPmessagesHandoverRequestandAssignmentRequestorthevalue|nopreference|iftheMSChasomittedtheInformationElement|ServiceHandover|.The|ServiceHandover|InformationElementmayhavethevalues|HandovertoUTRANshouldbeperformed|,|HandovertoUTRANshouldnotbeperformed|or|HandovertoUTRANshallnotbeperformed|.

IftheMSCindicatesthattheconnectionshallnotbehandedovertoUTRAN,BSSnevertriggersahandovertoUTRAN.IftheMSCindicatesthataconnectionshouldnotbehandedovertoUTRAN,BSSonlytriggersahandovertoUTRANincaseanyurgencycriterionisfulfilledintheGSMcell.IncasetheMSCindicatesthatahandovershouldbeperformed,BSStriggersahandovertoUTRANwhenthesignalqualityinthetargetcellisgoodenough,regardlessofthetrafficload.

TheServiceIndicatorisvalidperCSconnectionbutmaybechangedduringacall.Regardlessofusedhandovercriteria,allvalidneighbouringUTRANcellsaresortedinorderofdecreasingCPICHEc/No.AfinalcandidatelistiscreatedbypossiblyaddingUTRANcellstotheGSMcandidatecellsaccordingtothetablebelow.

Non-urgencyHO UrgencyHO

Noload Load Noload Load

Nopreference G UG GU UG

Should UG UG UG UG

shouldnot G G GU GU

shallnot G G G G

Table2CellorderinthefinalhandovercandidatelistwhenServiceIndicatorisused."Load"and"Noload"isi

Legend:G-onlyGSMcellsinthecandidatelist,UG-UTRANcellsareaddedonthetopofthecandidatelist,GU-UTRANcellsareaddedatthebottomofthecandidatelist.|Load|indicatesthattheloadcriterion(6)isfulfilled.|Urgency|indicatesthatanyoftheurgencycriteriaisfulfilled.



Example1.IftheServiceIndicatorhasthevalue|HandovertoUTRANshallnotbeperformed|,theurgencycriterionforTimingAdvanceisfulfilled,andtheloadcriterion(6)isfulfillednohandovertoUTRANwilltakeplacesincethefinalhandovercandidatelistwillnotcontainanyUTRANcells.

Example2.IftheServiceIndicatorhasthevalue|HandovertoUTRANshouldbeperformed|andtheloadcriterion(6)isNOTfulfilled,handovertoUTRANwillbetriggeredifthereareanyUTRANcellsthatfulfillthequalitycriterion(5).

3.3.4.4SmoothGSMtoWCDMAUnloading

WiththefeatureSmoothGSMtoWCDMAUnloading,themaximumnumberofhandoverstoperformpersecondtoUTRANissetwiththeparameterMAXISHO,definedperGSMcell.WhenthenumberofhandovershavereachedthevaluesetbyMAXISHO,UTRANcellsarenotincludedinthecandidatelistproducedbyLocating.OnlythenumberofhandoversthataretriggeredbecauseofhightrafficloadintheGSMcell(loadcriterion(6)fulfilled),areexcludedandcounted.HandoversforconnectionswiththeServiceIndicatorwithavalueotherthan|Nopreference|,arenotcountednorexcluded.Neitherarehandoversduetourgencyexcludedorcounted.

IncominghandoversfromUTRANwithoutServiceIndicatorandwhichhascausevalues"DirectedRetry"or"Reduceloadinservingcell'willberejectedincaseofhightrafficloadintheGSMcell,thatiswhenloadcriterion(6)isfulfilled.

3.3.4.5CombinedHandoverTriggeringGSMtoWCDMA

WiththefeatureCombinedHandoverTriggeringGSMtoWCDMAitispossibletocontrolthemeasurementreportingofUTRANneighbouringcells.Theparameter FDDREPTHR2definesathresholdforthenonreportingradioentityoftheUTRANcells.NoUTRANcellswillbeincludedinthemeasurementreportsfromtheMSunlessthenonreportingUTRANradioentityisabovethedefinedthreshold.SinceUTRANcellsarereportedusingtheradioentityCPICHEc/No,theparameterFDDREPTHR2isrelatedtotheUTRANradioentityCPICHRSCP.

ThethresholdparameterFDDREPTHR2assuresasufficientdownlinksignalstrengthoftheUTRANcell,whichinturnincreasesthepossibilityforthemobiletoreachtheUTRANcellintheuplink.

ThethresholdparameterFDDREPTHR2isusedbyMSsbeinginconnectedmodeaswellasMSsbeinginNC2mode.

3.3.4.6QueuingofWCDMACallsinBSS

ThefeatureQueuingofWCDMACallsinBSSmakesitpossibletoprovideenhancednetworkaccessibilityinGSMtoprioritizedsubscriberscomingfromtheWCDMAnetworkviathedirectedretryprocedure.DirectedretryisusedduringcallsetupinWCDMAtosendthecalltoGSMduringcongestionintheWCDMAnetwork.PriorityandqueuinginformationissentfromthecorenetworktoBSSaspartofthedirectedretryprocedure.IncaseofcongestioninthetargetGSMcell,thehighprioritysubscriberisthenqueuedinBSS,togetherwithotherhighprioritysubscribers,accordingtotheirpriorityandtimeofarrivalinBSSuntiltherearefreeresourcesintheGSMcelloruntilatime-out(after10seconds)inBSS.

ThisfeatureworksasdescribedevenifthefeatureSmoothGSMtoWCDMAUnloadingisenabled.

Formoredetailsaboutthisfeature,seeReference[1]



3.3.5 Location Area Update Procedure

Tomakeitpossiblefortheend-usertoreceiveacall,thenetworkmustknowwheretheMSislocated.TokeepthenetworkupdatedonthelocationoftheMS,thesystemisinformedbytheMS.ThisiscalledLocationUpdating(seeReference[2]).

AnoperatorcanconfigureGSMandUMTScellstobemembersofthesameregistrationarea(thatis,sameLAI)andtheMulti-RATMSdoesnotneedtoperformlocationupdatejustbecausethemobilehaschangedfromaUMTStoaGSMcell.AMulti-RATMSinitiatesnormallocationupdatingwhenitdetectsthatithasenteredanewlocationarea.WhentheMulti-RATMSislisteningtothesysteminformationtransmittedontheservingcell,itwillcomparethebroadcastLocationAreaIdentity(LAI)withtheonestoredintheMulti-RATMS.IfthebroadcastLAIdiffersfromtheonestored,alocationupdatingtypenormalwillbeinitiatedandthenewLAIwillbestoredintheMulti-RATMS.

IfaGSM-UMTShandoverhasoccurredtoanewLAduringacall,LocationUpdatingisperformedafterthecallhasfinished.

3.3.6 Routing Area Update Procedure

AnoperatorcanconfigureGSMandUMTScellstobemembersofthesameregistrationarea(thatis,sameRAI).DuringanintersystemcellreselectionfromGPRS/EGPRStoUMTSorUMTStoGPRS/EGPRS,differentproceduresarefolloweddependingonthemobilitymanagementstate(thatis,StandbyorReadystate)andtheNetworkOperationMode.

GenerallythesameproceduresareusedatintersystemcellreselectionbetweenGPRS/EGPRSandUMTSasforGPRS/EGPRScellreselection(seeReference[3]).AMulti-RATMSinitiatesaroutingareaupdatewhenitdetectsthatithasenteredanewroutingarea.

Inshort,thefollowingrelationsbetweenGPRS/EGPRSandUMTSmobilitymanagementstatesapplies:

UMTSPS-ConnectedStatecorrespondstoGPRS/EGPRSReadyState.

UMTSPS-IdleStatecorrespondstoGPRS/EGPRSStandbyState.

WhenaMulti-RATMSinUMTSPS-ConnectedStatechangestotheGSMradioaccess,orinGPRS/EGPRSReadyStatechangestotheUMTSradioaccess,theMulti-RATMSinitiates|RAupdate|procedureindependentofwhethertheRAhaschangedornot.

WhenaMulti-RATMSinUMTSPS-IdleStatechangestotheGSMradioaccess,orinGPRS/EGPRSStandbyStatechangestoUMTSradioaccess,theMulti-RATMSinitiates|RAupdate|procedureonlyiftheRAchanges.

IftheRAdoesnotchangewhenaMulti-RATMSinUMTSPS-IdleStatechangestoGPRS/EGPRSStandbyState(orviseversa),theMulti-RATMSshallinitiate|SelectiveRAupdate|procedure.ThismeansthattheMulti-RATMSonlyperformsaRAUpdatewhenuplinkdataorsignallingisrequiredorwhenitgetspaged(seeReference[9]).

TheGPRS/EGPRSMulti-RATMSperformsa|CombinedLA/RAUpdate|ifthenetworkoperatesinNetworkOperationModeIandiftheMulti-RATMSisbothPSandCSattached(Reference[9]).

3.4RelatedStatistics

3.4.1 Impact on Legacy Counters

None.



3.4.2 Statistics for Performance Management

ThereareanumberofcountersperUTRANcellrelationintheobjectNUCELLRELCNT.

Countersrelatedtohandoverperformanceontheairinterface

Thenumberofhandovercommandssenttomobilestation,withtheneighbouringUTRANcellastargetcell(HOVERCNTUTRAN).

ThenumberofsuccessfulhandoverstotheneighbouringUTRANcell(HOVERSUCUTRAN).

ThenumberofhandoverattemptstotheneighbouringUTRANcellwhentheMSreturnedtotheoldchannel(HORTTOCHUTRAN).

ThenumberofhandovercommandssenttomobilestationduetourgencyintheGSMcell,withtheneighbouringUTRANcellastargetcell(URGHOVERUTRAN).

Thenumberofsuccessfulhandoverattempts,duetourgencyintheGSMcell,totheneighbouringUTRANcell(SUCURGHOUTRAN).

CountersrelatedtohandoverproceduresontheA-interface

ThenumberofhandoverrequiredsenttotheneighbouringUTRANcell(HOREQCNTUTRAN).

CountersrelatedtothefeatureHandoverwithUsageofServiceIndicator

NumberofhandoverattemptstoaneighbouringUTRANcellbecausetheServiceHandovervalueissetto|HandovertoUTRANshouldbeperformed|(HOATTSHOULDUTRAN).

CountersrelatedtothefeatureOptimizedthroughputatGSMtoWCDMACellChange

ThenumberofTBFspercellwherecellreselectiontoUTRANwasavoidedatleastoncewhileinNC2(IRATPREV).

CountersrelatedtothefeatureFastReturntoWCDMAafterCallRelease

ThenumberoftimeswhenthemessageCHANNELRELEASEissentwiththeIE"CellselectionindicatorafterreleaseofallTCHandSDCCH"

4EngineeringGuidelines

4.1Multi-RATMSCapabilities

ItisimportanttousetheEarlyClassmarksendingtoassurethatthesystemknowsabouttheMulti-RATcapabilities.WithEarlyclassmarksending(settingofparameterECSC=YES),theMulti-RATMSwillthensendClassmarkChangeassoonaspossibleaftercallsetup.Inthismessage,MSClassmark3isincluded,inwhichtheMulti-RATcapabilitiesofthemobilearedescribed.

4.2SystemInformation

TheUTRANcellstobemonitoredforintersystemcellreselectionaredefinedinthe3GneighbouringcelllistbroadcastonBCCH(SystemInformationType2quater).IfalsoaPBCCHexists,the3GneighbouringcelllistisbroadcastonPBCCH(PacketSystemInformationType3quater).The3Gneighbouringcelllistmaycontainupto64UTRANneighbours.

TheSI2quaterandPSI3quatermessagesareonlybroadcastifanyUTRANneighbouringcellsexistandtheexchangepropertyCOEXUMTSissettoON.



SI2quatermaybesentoneitherBCCHnormalorBCCHextended(seeReference[12]).IfnotallinformationfitsintooneSI2quatermessage,theremaininginformationwillbesentinotherinstancesofthismessage.

WhenSI2quaterissent,AGBLKisrecommendedtobesetto1inthefollowingcases:

SI2bisandSI2teraresent.

GPRS/EGPRSisactiveandSI2bisissent.

GPRS/EGPRSisactiveandSI2terissent.

ThisisbecauseSystemInformation2quaterwillsharethesameresourcesasSystemInformation13and/orSystemInformation2teronBCCHnormalimplyinglongercyclefortheseSystemInformationtobebroadcast.Thiscouldimpactcellselection/reselectionperformance.WhenAGBLK=1,eitherSI2quaterorSystemInformation13areplacedonBCCHextendedintheabovecases.However,useofBCCHextendedimpliesreductionofthepagingcapacitysinceBCCHextendedsharestheresourcewithPCHandAGCH,seefurtherReference[2].

4.3CellReselectiontoUMTS

4.3.1 Camping Strategy for a Combined WCDMA/GSM Network

Thechoiceofsystemforidlemodecampingisimportant.TheMulti-RATMSshouldcamponthesystemwhereitisexpectedtosetupitsservicesandwhereitwillbepaged.InorderfortheMulti-RATMStobeabletoaccessUTRANspecificservicesitneedtocamponUTRAN.Therecommendedstrategyistherefore:

|camponUTRANwheneverthereisUTRANcoverage.

OutsideUTRANcoveragetheMulti-RATMSwillcamponGSM,togetaccesstostandardGSMservices.OnceaUTRANcellisselected/reselectedtheparametersettinginUTRANshouldtrytokeeptheUEinUTRANaslongasthequalityandreceivedsignalstrengthoftheUTRANcellisgoodenough.

TheGSMparametersettingsrecommendedinthisengineeringguidelineenablethecampingstrategydescribedabove.

4.3.2 Cell Selection

ItistheinitialprocessofthePLMNselectionthatdecideswhatPLMNwillbechoseninitially.ThisprocesswilldependontheMStype,aswellasbothoperatorcontrollableandusercontrollabledatastoredontheSIMcard,suchaspreferredPLMNandRAT(seeSection3.3.1andReference[10]).Thattypeofdatacannotbecontrolledbythecellreselectionparameters,assentbytheGSMnetworkinsysteminformationmessages.

4.3.3 Cell Reselection to UMTS

ItisimportanttocoordinatetheparametersinGSMandUTRANtoachievethewantedinterRATcellreselectionbehaviourandthusasmoothco-existence.ForextensiveinformationonthecellreselectionalgorithmfromUTRANtoGSMandcorrespondingparameters,parameterrangesanddefaultvalues,seeReference[15].

TherecommendedcellreselectionparametersettinginthefollowingsubchaptersarecoordinatedwiththecorrespondingparameterrecommendationsforUTRANtoGSMcellreselectionfoundinReference[15].



4.3.3.1MeasurementsonUTRANNeighbouringCells

TheparameterQSIcontrolswhenthemulti-RATMSshallperformmeasurementsonUTRANneighbouringcells.

ToenablecellreselectiontoUTRANinareaswithgoodGSMcoverageitisnecessarytomeasureonUTRANalsowhenGSMcoverageisgood.TherecommendationisthatGSMcellsthathaveUTRANneighbourcellsshouldhavetheQSIvaluesettoalways.

4.3.3.2CellReselectionAlgorithm

WhenanMSisinNC0orNC1mode,thealgorithmforcellreselectionfromGSMtoWCDMAiscontrolledwiththeparametersFDDQMINandFDDQOFF.FDDQMINdefinestheminimumqualityoftheaWCDMAcellforcellreselection,measuredinCPICHEc/No.ThisparameterisusedtoassureasufficientqualityofthecandidateWCDMAcell.FDDQOFFsetsanoffset,positiveornegative,betweensignalqualityofGSMcellsandthedefinedWCDMAneighbours.Thecellreselectioncriteriaare:

CPICHEc/No>FDDQMIN (1)

and


WhereRLA(s+n)istheaveragedreceivedsignallevel[dBm]forboththeservingGSMcellanditsstrongestGSMneighbours.

Foramulti-RATMSjustenteredGSMaping-pongbacktoUTRANisprohibitedbyatimer.Themulti-RATMSmustfulfilthetwocellreselectioncriteriaaboveforaperiodof5secondsafterthecellreselectiontoGSMandanadditionaloffsetof5dBwillbeaddedtoFDDQOFFduring15seconds.

ToachievethepreferredcampingbehaviourtheMulti-RATMSshouldcamponUTRANwhenthereisUTRANcoverage.ThismeansthatanegativevaluemustbesetforFDDQOFFifcellreselectionshallbepossiblewhenGSMcoverageisgood.AdrawbackwouldbethatcellreselectiontoaweakUTRANcellcouldbemadewhenGSMcoverageisgood.UsingahighersettingofFDDQMINpreventssucheffect.AsettingofFDDQMINasbelow,

FDDQMIN>qQualMin+sRatSearch+ahysteresis,

preventsthemulti-RATMSfrommakingcellreselectiontoaweakUTRANcell.ThisFDDQMINparametersettingwillalsomakesurethatthemulti-RATMSwillnotstarttomeasureontheGSMcellsimmediatelyincasetheMShasmadeacellreselectiontoUTRAN.qQualMinandsRatSearcharetheUTRANparametersthatdefinetheminimumqualitylevelthatisrequiredforaUTRANcellandatwhichpointthemeasurementonGSMcellsshallstart,seeReference[15].ItshallbenotedthattheqQualMinandsRatSearchparametersarerelatedtotheidlemode,Cell_FachstateandURA_PCHstateinWCDMA.AnothercaseisifapackettransferisongoingandifthepackettransferisgoingtocontinueusingadedicatedchannelontheWCDMAside.AsettingofFDDQMINasbelow,

FDDQMIN>usedFreqThresh2dEcno+ahysteresis

preventsthemulti-RATMSfromstartingmeasurementsonGSMcellsimmediatelyincasetheMShasmadeacellreselectiontoWCDMAandendeduponadedicatedchannelinWCDMA.

TherecommendedparametersettingofFDDQMINandFDDQOFFarethefollowing:

FDDQMIN=-10dB



FDDQOFF=-inf

ThisparametersettingwillgiveacellreselectionalgorithmthatbasisthecellreselectiononthequalityoftheUTRANcellonly,thissincethecellreselectioncriteria2abovewillbefulfilledforallUTRANneighbours.

4.3.3.3CombinedCellReselectionTriggeringGSMtoWCDMA

Multi-RATmobilesthatsupportRSCPevaluationbeforetriggeringacellreselectiontoWCDMA,willevaluateUTRANcellsaccordingtocellreslectioncriteria(2),(3)and(4)below:


CPICHEc/No>FDDQMIN - FDDQMINOFF (3)

and

CPICHRSCP>FDDRSCPMIN-min((P_MAX-21), 3dB) (4)

TherecommendedsettingsofFDDQOFFandFDDQMINareasdescribedinSection4.3.3.2.

TheparameterFDDQMINOFFhasapositivevalueandwilldecreasetheminimaldownlinkqualityCPICHEc/N0requiredforacellreselectiontotheUTRANcellandwiththesameargumentsasinSection4.3.3.2,thefollowingsettingisrecommendedforFDDQMINOFFincombinationwithFDDQMIN:

FDDQMIN - FDDQMINOFF>qQualMin+sRatSearch+ahysteresis

DuetotherecommendedsettingofqQualMInandsRATSearch,FDDQMINOFFcaneithertakethevale0or2dBandtherecommendedsettingofFDDQMINOFFis:

FDDQMINOFF=0dB.

TheabsoluteminimumCPICHRSCPvaluetoreselectaUTRANcellisgivenbytheselectionparameterqRxLevMininUTRAN.AsettingofFDDRSCPMINasbelow,

FDDRSCPMIN>qRxLevMin+sHcsRat+ahysteresis

preventsthemulti-RATmobiletotriggerareselectiontoaweakUTRANcell.ThisFDDRSCPMINparametersettingwillalsomakesurethatthemulti-RATMSwillnotstarttomeasureontheGSMcellsimmediatelyincasetheMShasmadeacellreselectiontoUTRAN.qRxLevMinandsHcsRataretheUTRANparametersthatdefinetheminimum|signalstrength|(CPICHRSCP)thatisrequiredforaUTRANcellandatwhichpointthemeasurementonGSMcellsshallstart,seeReference[15].

ItshallbenotedthattheqRxLevMinandSHcsRatparametesarerelatedtotheidlemodeandtheCellFachstateinWCDMA.AnothercaseisifapackettransferisongoingandifthepackettransferisgoingtocontinueusingadedicatedchannelontheWCDMAside.AsettingofFDDRSCPMINasbelow,

FDDRSCPMIN>usedFreqThresh2dRscp+ahysteresis

TherecommendedsettingofFDDRSCPminis:

FDDRSCPMIN=|102dBm



Notethatforamobilewiththemaximumoutputpowerof21dBm,thecellreselectionwillbeperformedatthislevelbutforamobilewiththemaximumpoweroutputof24dBm,thecellreselectionwillbeperformedat|105dBm.

4.3.3.4OptimizedthroughputatGSMtoWCDMACellChange

SincethisfeatureisbasedonNC2,itisimportantthattheparametersforNC2areconfiguredproperlytothenetwork,seeReference[3].

4.3.4 Cell Reselection from UMTS to GSM

ForinformationoncellreselectionfromUTRANtoGSMandcorrespondingparameters,ranges,anddefaultvalues,seeReference[15].

4.4Intersystemcellselectionaftercallrelease

WhenthereisnoActiveUTRANMeasurementFrequencyListdefined,thereisariskthatthemobilewillbere-directedtoWCDMAeventhoughthereisnoWCDMAcoverage.ThemobilewillthenunsuccessfullysearchforWCDMAcellsandafterawhileselectaGSMcell.Insuchacase,thePagingoutagetimewillinsteadincrease.ThereforeitisrecommendedtousecommandRLRWEtoturnoffthefeatureinGSMcellswheretheUTRANcoverageispoorandwhennoActiveUTRANMeasurementFrequencyListhasbeenconfigured.

Iftheparameter QSIissetto15(=never),meaningthatmobileshouldnotmeasureonWCDMAcellswhileinidlemode,itisrecommendedtoturnoffthefeature(commandRLRWE)intheGSMcellinordertonotrequestthemobiletoselectaWCDMAcellaftercallrelease.

IfashorterpacketdatatransfertimehashigherprioritythanashorterPagingoutagetime,theparameterFASTRET3GNC2shouldbesetto1(=no-redirect)sothatthemobileisnotrequestedtoselectaWCDMAcellwhenthefeatureOptimizedthroughputatGSMtoWCDMACellChangeisactiveandaCSconnectionofaDTMcallisreleased.

4.5InterSystemHandover

4.5.1 General

ItisimportanttocoordinatetheparametersinGSMandUTRANtoachievethewantedintersystemhandoverbehaviourandthusasmoothco-existence.TherecommendedhandoverparametersettinginthefollowingsubchapteriscoordinatedwiththecorrespondingUTRANhandoverparametersettingfoundinReference[16].

4.5.2 Handover to UTRAN

Thefollowinghandoverparametersettingisrecommended:

1.SPRIO=Yes,motivation:securethatMulti-RATmobileshaveenoughtimefor3GmeasurementsalsoforthecasethentheMulti-RATmobileisbusywithmeasurementonGMSneighbours.

2.FDDMRR=1incasetheGSMcellhasGSMneighboursindifferentGSMbands(thatis,GSM900and1800band),motivation:minimizetheimpactonthemeasurementofGSMneighbours.

FDDMRR=2incasetheGSMcellhasneighbourswithinoneGSMband.Motivation:minimizeimpactonGSMmeasurementsbutallowmore3Gneighbourstobereportedcomparedtothecaseabove.



3.QSC/ISHOLEV(alternative1,GSMusedtoextendUTRANcoverageandoff-loadGSMsystematcertaintrafficloadthreshold):

SetQSC=7(always)orQSC=8(above-78dBm)forUTRANcellco-sitedwithGSMcell.SetISHOLEV=wantedtrafficloadatwhichthehandoverUTRANshallstart.

4.QSC/ISHOLEV(alternative2,GSMusedtoextendUTRANcoverage):

SetQSC=7(always)orQSC=8(above-78dBm)forUTRANcellco-sitedwithGSMcell.SetISHOLEV=99.

5.QSC/ISHOLEV(alternative3,GSMtobeextendedwithUTRANcoverage):

SetQSC=1(below-94dBm)SetISHOLEV=99.

6. QSCI=1(always).

7.MRSL=30(-9dB)Motivation:thevalueoftheMRSLparametershallbesetsothatahandovertoUTRANisnotimmediatelyfollowedbya|ping-pong"handoverbacktoGSMandtoavoidstartingGSMmeasurementsdirectlywhenenteringUTRAN.ThisisachievediftheMRSLparameterhasthefollowingrelationtotheUTRANparameterusedFreqThresh2dEcno:

MRSL>usedFreqThresh2dEcno+ahysteresis.

Thesettingto-9dBfulfillstherelationsaboveusingthedefaultsettingoftheUTRANparameterusedFreqThresh2dEcno.

TheUTRANparameterusedFreqThresh2decno definestheEc/NothresholdwhenstartingtomeasureonGSMcells.

UTRANmayalsostartmeasurementsifmeasuredCPICHRSCP,whichisameasureofthedownlinksignalstrength,isbelowUsedFreqThresh2dRscp.SinceitmayaccurthatthemeasuredsignalqualityCPICHECN0isgoodbutthesignalstrengthweak,therecommendedMRSLsettingabovemayhavetobeadjustedtoahighervaluetopreventping-ponghandovers.

Theevent3aisusedinUTRANtotriggertheexecutionofahandoverfromUTRANtoGSM,forfurtherinformationseeReference[16].Themeasurementevent3aisdefinedasfollows:theestimatedqualityofthecurrentlyusedUTRANfrequencyisbelowacertainthresholdandtheestimatedqualityoftheGSMsystemisaboveacertainthresholdinthesametimeinterval.

4.5.3 Combined Handover Triggering GSM to WCDMA

InadditiontotherecommendedparametersettinginSection4.5.2thefollowingparametersettingsarerecommended:

1.FDDREPTHR2=16(-100dBm).Motivation:thevalueoftheFDDREPTRH2parametershallbesetsothatahandovertoUTRANisnotimmediatelyfollowedbya|ping-pong|handoverbacktoGSMandtoavoidstartingGSMmeasurementsdirectlywhenenteringUTRAN.ThisisachievediftheFDDREPTHR2parameterhasthefollowingrelationtotheUTRANparameterusedFreqThresh2dRscp:

FDDREPTHR2>usedFreqThresh2dRscp+ahysteresis.

Therecommendedsettingto-100dBmfulfillstherelationsaboveusingthedefaultsettingoftheUTRANparameterusedFreqThresh2dRscp.

TheUTRANparameterusedFreqThresh2dRscpdefinestheCPICHRSCPthresholdwhenstartingtomeasureonGSMcells.



4.5.4 Handover to GSM

ForfurtherinformationregardingthehandoveralgorithmfromUTRANtoGSM,seeReference[16].

4.5.5 Smooth GSM to WCDMA Unloading

Thefollowingparametersettingsarerecommended:

MAXISHO=2,Motivation:therateatwhichloadvariesinacellpersecondisnormallyrelatedtothecellsize.Assumingacellwith20channelsandameanholdingtimeof90seconds,callsareinaveragesetupwitharateof20calls/90s,thatis,lessthanonecallpersecond.Therefore,tokeeptheloadlevelclosetoISHOLEV,alimitationof2handoverspersecondshouldbesufficient.Notethataslongastherearemulti-RATMSsinthecell,theloadwillvaryaroundthevaluesetbyISHOLEV.

5Parameters

5.1General

ThefeatureGSM-UMTSCellReselectionandHandoverisactivatedperBSCwiththeexchangepropertyCOEXUMTS.InadditionthefeaturesCombinedCellReselectionTriggeringGSMtoWCDMAandCombinedHandoverTriggeringGSMtoWCDMAcanbeactivatedwiththisexchangeproperty.

ThefeatureHandoverwithUsageofServiceIndicatorisactivatedperBSCwiththeexchangepropertySBHOACTIVE.

ThefeatureSmoothGSMtoWCDMAUnloadingisactivatedperBSCwiththeexchangepropertyCOEXUMTSLSH.

UTRANFDDneighbouringcellsareidentifiedwithafrequencyandscramblingcodecombination.Inidlemode,themeasurementfrequency(MFDDARFCN)andscramblingcodeMSCRCODEfortheneighbouringUTRANcellsaredefinedwithintheparameterUMFI.ThisparameterisalsousedtodefineifdiversityisappliedornotforanUTRANcell.Upto64UTRANneighbouringcellsmaybedefinedperGSMcell.Inactivemode,withinthedefinitionofneighbouringcellrelations,severalparametersaredefiningoneneighbouringUTRANcell:RadioFrequencyChannelNumber(FDDARFCN),ScramblingCode(SCRCODE),CellIdentity(UTRANID)andtheMinimumReportedSignalLevelforCPICHEc/No(MRSL).UTRANIDconsistsoftheRNCIdentity(RNCID),CellIdentitywithintheRNC(CI),MCC,MNCandLAC.

ThefeatureNC2isactivatedpercellusingthecommandRLNMI.TheNC2profileisselectedviatheparameterNCPROF.

5.2MainControllingParameters

5.2.1 Feature Controlling Parameters

COEXUMTS

isusedtoenablethefeaturesGSM-UMTSCellReselectionandHandover,CombinedCellReselectionTriggeringandCombinedHandoverTriggeringGSMtoWCDMA.TheparameterisaBSCexchangeproperty.

0OFF;GSM-UMTSCellReselectionandHandoverandCombinedCellReselectionTriggeringGSMtoWCDMAarenotactivated.

1ON;GSM-UMTSCellReselectionandHandoverisactivated



2ONADDINFO;GSM-UMTSCellReselectionandHandoverandCombinedCellReselectionTriggeringGSMtoWCDMAareactivated

3ONADDINFO;GSM-UMTSCellReselectionandHandoverandCombinedHandoverTriggeringGSMtoWCDMAareactivated

4ONADDINFO;GSM-UMTSCellReselectionandHandover,CombinedCellReselectionTriggeringGSMtoWCDMAandCombinedHandoverTriggeringGSMtoWCDMAareactivated

COEXUMTSLSH

isusedtodetermineifrejectionofincominghandoversfromUTRANandlimitationofthenumberofoutgoinghandoverstoUTRANduetoloadinGSMisallowed(=ON)ornot(=OFF)intheBSC.TheparameterisaBSCexchangeproperty.

0OFF

1ON

FASTRET3G

showstheactivationstatusofthefeatureFastReturntoWCDMAafterCallRelease(activated/deactivated/printedwiththecommandsRLRWI/RLRWE/RLRWP).

Active

Inactive

FASTRET3GNC2

controlswhethertoredirectDTMcallsaftercallreleasewhenthefeatureOptimizedthroughputatGSMtoWCDMACellChangeisactive.TheparameterisaBSCexchangeproperty.

0re-direct

1donotre-direct

NCPROF

indicateswhichNC2profileistobeactivatedinacellwhenanMSisinNC2mode.Thedefaultvalueis1whichactivatesthefeatureOptimizedthroughputatGSMtoWCDMACellChange.Thevaluerangeis1|255,where2|255areundefined.

SBHOACTIVE

isusedtodetermineifhandoverwithusageofServiceIndicatorisallowed(=ON)ornot(=OFF)intheBSC.TheparameterisaBSCexchangeproperty.

0OFF

1ON

5.2.2 Parameters for Inter System Cell Reselection to UMTS

FDDQMINdefinestheminimumthresholdforthe|quality|measureEc/NoforcellreselectiontoUTRAN.ThisparameterisdefinedperGSMcellandappliesforallitsUTRANneighbours.

FDDQMINOFFdefinesanoffsettothethresholdFDDQMIN.ThisparameterisdefinedperGSMcellandappliesforallitsUTRANneighbours.



FDDQOFFdefinestheminimumthresholdforthe|quality|measureEc/NoforcellreselectiontoUTRAN.ThisparameterisdefinedperGSMcellandappliesforallitsUTRANneighbours.

FDDRSCPMINdefinestheminimumthresholdforthe|signalstrength|measureCPICHRSCPforcellreselectiontoUTRAN.ThisparameterisdefinedperGSMcellandappliesforallitsUTRANneighbours.

QSIdefinesifthemonitoringofUMTScellswillbeperformedifthesignallevelisbelow(0-6)orabovethethreshold(8-14),always(7)ornever(15).ThisparameterisdefinedperGSMcell.

UMFI

(MFDDARFCN-MSCRCODE-DIVERSITY)definesthefrequency,scramblingcodeanddiversityinformationforaUTRANneighbouringcell.

MFDDARFCNindicatestheabsoluteRFchannelnumberoftheneighbouringUTRANcelltobemeasuredonbyMulti-RATMSs.SeveralfrequencybandsexistandtheabsoluteRFchannelnumberrepresentsthecenterfrequencywithinthefrequencyband.AllowedfrequencybandsandabsoluteRFchannelnumbersaredescribedindetailinReference[13].

MSCRCODEisthescramblingcodefortheneighbouringcell.Thescramblingcodehas512values.

DIVERSITYindicatesifdiversityisappliedfortheUTRANcell,ornot.

ThisparameterisdefinedperGSMcell.

5.2.3 Parameters for Inter System Handover to UMTS

COEXUMTSTINTisusedtocontrolthetimeintervalbetweentrafficloadchecking.ThisparameterisaBSCexchangeproperty.

FDDARFCN

indicatestheabsoluteRFchannelnumberoftheneighbouringUTRANcellinGSMactivemode.SeveralfrequencybandsexistandtheabsoluteRFchannelnumberrepresentsthecenterfrequencywithinthefrequencyband.AllowedfrequencybandsandabsoluteRFchannelnumbersaredescribedindetailinReference[13].ThisparameterisdefinedperUTRANcell.

FDDMRRdefinesthenumberofUTRANcellsthatthemobileshouldincludeinmeasurementreports.ForadetaileddescriptionseeSection3.3.4.2.ThisparameterisdefinedperGSMcell.

ISHOLEVdefinesthetrafficloadthresholdoftheservingGSMcellthatneedstobeexceededinordertoevaluateUMTSmeasurementsforhandovers.ThisparameterisdefinedperGSMcell.

MAXISHO

definesthemaximumnumberofallowedhandoverstotriggertoUTRANpersecond.OnlyhandoversthataretriggeredbecauseoftrafficloadintheGSMcellarecountedorlimited.ThisparameterisdefinedperGSMcell.

MRSLdefinesaminimumthresholdforthe"quality"measureEc/NoforhandoverstoUTRAN.ThisparameterisdefinedperUTRANcell.

FDDREPTHR2

definesathresholdforthenonreported|signalstrength|measureCPICHRSCPofUTRANcells.TheMSincludesaUTRANcellinthemeasurementreportsonlyifthenonreportingthresholdisexceeded.ItshallbenotedthatthereportingentityinthemeasurementreportsisCPICEc/No.ThisparameterisdefinedperGSMcell.



SCRCODEisthescramblingcodefortheneighbouringUTRANcellinactivemode.Thescramblingcodehas512combinations.ThisparameterisdefinedperUTRANcell.

SPRIO indicatesif3GcellsmaybesearchedwhenBSICdecodingisrequired.ThisparameterisdefinedperGSMcell.

UTRANIDUTRANIDpresenttheIdentityoftheneighbouringUTRANcellinactivemode.ItconsistsoftheRNCIdentity(RNCID),CellIdentitywithintheRNC(CI),MCC,MNCandLAC.ThisparameterisdefinedperUTRANcell.

QSCdefinesifthemonitoringofUMTScellswillbeperformedifthesignallevelisbelow(0-6)orabovethethreshold(8-14).always(7)ornever(15).ThisparameterisdefinedperGSMcell.

QSCI

definesthecontrolofUTRANmeasurementafterenteringactivemode,beforereadingthefirstQSC.InthatperiodUTRANmeasurementscanalwaysbeperformed(=1)oraccordingtoQSIvalue(=0).ThisparameterisdefinedperGSMcell.

GPRSPRIO

GPRSPRIOisaBSCcellparameterthatcontrolswhetheron-demandPDCHsshallberegardedasidleorbusywhentrafficload(percentageofidlechannels)iscalculatedinthecell(seeparameterdescriptioninReference[7]).

5.3ValueRangesandDefaultsValues

Parameter name Default value

Recommended value

Value range Unit

COEXUMTS 0(OFF) - 0(OFF),1(ON),2(ONADDINFO),3(ONADDINFO),4(ONADDINFO)

COEXUMTSLSH 0(OFF) - 0(OFF),1(ON)

FASTRET3GNC2 0(re-direct)

0 0(re-direct)

1(donotre-direct)

SBHOACTIVE 0(OFF) - 0(OFF),1(ON)

NCPROF 1 1 1(OptimizedthroughputatGSMtoWCDMACellChange)

Values2|255areundefined.

-

Table3FeatureControllingParameters


Recommended value

Value range Unit

Table4ParametersforInterSystemCellReselectiontoUMTS



UMFI(MFDDARFCN-MSCRCODE-DIVERSITY)

- - MFDDARFCN:0to16383MSCRCODE:0to511

DIVERSITY:DIV,NODIV

FDDQMIN 0(-20dB) 5(-10dB) 0to7(-20dB,-6dB,-18dB,-8dB,-16dB,-10dB,-14dB,-

12dB)

dB

FDDQMINOFF 0(0dB) 0(0dB) 0to7(0to14dBinstepsof2dB)

dB

FDDQOFF 8(0dB) 0(-inf) 0to15(-inf,-28dBto+28dBinstepsof4dB)

dB

FDDRSCPMIN 6(-102dBm)

6(-102dBm) 0to15(-114dBmto|84dBminstepsof2dBm)

dBm

QSI 15(never) 7(always) 0to6(below-98dBmto-74dBminstepsof4dBm)7(always)8to14(above-

78dBmto-54dBminstepsof4dBm)15(never)

dBm


Recommended value

Value range Unit

COEXUMTSTINT 1000 1000 100to1000 ms

FDDARCN - - 0to16383

SCRCODE - - 0to511

UTRANID(RNCID-CI-MCC-MNC-LAC)

- - RNCID:0to4095CI:0to65535MCCMNCLAC

MRSL - 30(-9dB) 0to49

(0:MRSL

49:0dB

GSM Candidate List Alistofcandidatesforhandover,asaresultoftheGSMpartofthelocatingalgorithm.ByaddingtheUMTSneighboursonthetop,afinallistiscreated.

CPICH RSCP AMulti-RATMSmeasuresReceivedSignalCodePoweronneighbouringUTRANcellsinordertoevaluateintersystemcellreselectioncandidates.RSCPistheaveragepowerofthereceivedsignalafterdespreadingandcombining.

Home PLMN ThePLMNwheretheMCCandMNCofthePLMNidentitymatchtheMCCandMNCoftheIMSI.

Idle Mode Inthismode,themobilestationisnotallocatedanydedicatedchannel.ItlistenstotheCCCHandtheBCCH.

Inter System Cell Reselection Cellreselectionbetweennetworksusingdifferentradioaccess,forexampleGSMandUMTS.

Multi-RAT MS UserequipmentthatcanobtainservicefromGSMandoneormoredifferentRATssuchasUMTS.

On-demand PDCH APDCHwhichissetupandreleaseddynamicallydependingontheneedforpacketdatatrafficinthecell.ANon-demandPDCHmaybePDCHpre-empted.

Paging outage time ThePagingOutageTimeisreferredtoasthetimewhenanMScannotbereachedbyapagingmessage

PSI 3quater SysteminformationmessageonPBCCHusedbyMulti-RATMSsinGPRS/EGPRSReadyandStandbystates.

Packet Idle Mode Inthismode(onlyapplicableformobilestationssupportingGPRS/EGPRS),mobilestationisnotallocatedanyradioresourceonapacketdataphysicalchannel.ItlistenstothePBCCHandPCCCHor,ifthenetworkdoesnotprovidethose,totheBCCHandtheCCCH.

Packet Transfer Mode Inthismode(onlyapplicableformobilestationssupportingGPRS/EGPRS),themobilestationisallocatedradioresourceononeormorepacketdataphysicalchannels.

PDCH AfullrateTCHordualrateTCHintheCSdomainthatisallocatedbythePSdomaintocarryGPRS/EGPRStraffic.

Registered PLMN ThePLMNtowhichLocationRegistrationhasbeenperformed.

Service Indicator TheServiceIndicatorisaBSSinternalparameterthatindicateswhethertheMSChasanypreferenceoninwhich



system,GSMorWCDMA,aCSconnectionshallbeserved.ItwillhavethevalueasreceivedintheInformationElement|ServiceHandover|intheBBSMAPmessagesHandoverRequestandAssignmentRequestorthevalue|nopreference|iftheMSChasomittedtheInformationElement|ServiceHandover|.The|ServiceHandover|InformationElementmayhavethevalues|HandovertoUTRANshouldbeperformed|,|HandovertoUTRANshouldnotbeperformed|or|HandovertoUTRANshallnotbeperformed|

SI 2quater SystemInformationmessageonBCCHusedbyMulti-RATMSsinidlemodeandGPRS/EGPRSReadyandStandbymode.

Urgency Handover UrgencyhandoverisahandovertriggeredbecauseanurgencycriteriaisfulfilledintheservingGSMcell.Theurgencycriteriamaybeduetolargetimingadvance,baddownlinkqualityorbaduplinkquality.

UTRAN FDD UTRANhastwomodes,FDDandTDD,foroperatingwithpairedorunpairedbandsrespectively.FDDisaduplexmethodwherebyuplinkanddownlinktransmissionsusetwoseparatedradiofrequencies.

Glossary

BA

BCCHAllocation

BCCH

BroadcastControlChannel

BSC

BaseStationController

CPICH

CommonPilotChannel

CS

CircuitSwitched

EGPRS

EnhancedGPRS

FDD

FrequencyDivisionDuplex

GPRS

GeneralPacketRadioService



GSM

GlobalSystemforMobilecommunication

IMSI

InternationalMobileSubscriberIdentity

LA

LocationArea

LAC

LocationAreaCode

LAI

LocationAreaIdentity

MCC

MobileCountryCode

MNC

MobileNetworkCode

MS

MobileStation

NCC

NetworkColorCode

PBCCH

PacketBroadcastControlChannel

PDCH

PacketDataChannel

PLMN

PublicLandMobileNetwork

PS

PacketSwitched

RA

RoutingArea

RAT

RadioAccessTechnology

RLA_C

ReceivedLevelAverage(circuitswitched)

RLA_P

ReceivedLevelAverage(packetswitched)

RNC

RadioNetworkController



RSCP

ReceivedSignalCodePower

SACCH

SlowAssociatedControlChannel

SIM

SubscriberIdentityModule

UMTS

UniversalMobileTelecommunicationsSystem

UTRAN

UMTSRadioAccessNetwork

WCDMA

WidebandCodeDivisionMultipleAccess

ReferenceList

EricssonDocuments[1]UserDescription,EnhancedMulti-LevelPrecedenceandPre-emptionService,(UserDescription)

[2]UserDescription,IdleModeBehaviour,(UserDescription)

[3]UserDescription,GPRS/EGPRSCellReselection,(UserDescription)

[4]UserDescription,Locating,(UserDescription)

[5]UserDescription,DoubleBALists,(UserDescription)

[6]UserDescription,MultibandOperation,(UserDescription)

[7]UserDescription,ChannelAdministration,(UserDescription)

Standards[8]3GPPTS45.008,(GSMSpecification)

[9]3GPPTS23.060,(GSMSpecification)






WCDMAUserDescriptions[15]UserDescription,IdleModeBehaviourandConnectedModeBehaviourincell_FACHstate,(UserDescription)

[16]UserDescription,WCDMARANHandover,(UserDescription)



gsm-umts cell reselection and handover

Documents

user description

gsmumts cell reselection

allotherproduct introduction1

htm1 introduction1

htmreference listpage