ETSI EN 300 911 V8.4.1 (2000-10)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 8.4.1 Release 1999)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 911 Version 8.4.1SIST EN 300 911 V8.4.1:2003en01-december-2003SIST EN 300 911 V8.4.1:2003SLOVENSKI
STANDARD
ETSIEN300911V8.4.1(2000-10)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol(GSM05.08version8.4.1Release1999)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)2(GSM05.08version8.4.1Release1999)ReferenceREN/SMG-020508Q8R1KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)3(GSM05.08version8.4.1Release1999)ContentsIntellectualPropertyRights.7Foreword.71Scope.81.1References.81.2Abbreviations.92General.93Handover.113.1Overallprocess.113.2MSmeasurementprocedure.113.3BSSmeasurementprocedure.113.4Strategy.114RFpowercontrol.124.1Overallprocess.124.2MSimplementation.124.3MSpowercontrolrange.124.4BSSimplementation.134.5BSSpowercontrolrange.134.6Strategy.134.7Timing.134.8Dedicatedchannelsusedforavoicegroupcallorvoicebroadcast.145Radiolinkfailure.145.1Criterion.145.2MSprocedure.155.3BSSprocedure.156Idlemodetasks.156.1Introduction.156.2Measurementsfornormalcellselection.166.3Measurementsforstoredlistcellselection.166.4Criteriaforcellselectionandreselection.176.5Downlinksignallingfailure.186.6MeasurementsforCellReselection.196.6.1MonitoringofreceivedsignallevelandBCCHdata.196.6.2Pathlosscriteriaandtimingsforcellre-selection.206.6.3CellreselectionalgorithmforSoLSA.216.6.4Algorithmforcellre-selectionfromGSMtoUTRAN.216.7ReleaseofTCHandSDCCH.226.7.1Normalcase.226.7.2Callre-establishment.226.8Abnormalcasesandemergencycalls.237Networkpre-requisites.237.1BCCHcarriers.237.2IdentificationofsurroundingBSSforhandovermeasurements.248Radiolinkmeasurements.258.1Signallevel.268.1.1General.268.1.2Physicalparameter.268.1.3Statisticalparameters.278.1.4Rangeofparameter.278.1.5Measurementquantityforotherradioaccesstechnologies.278.1.5.1UTRANFDD.278.1.5.2UTRANTDD.28SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)4(GSM05.08version8.4.1Release1999)8.1.5.3cdma2000.288.2Signalquality.288.2.1General.288.2.2Physicalparameter.288.2.3Statisticalparameters.288.2.4Rangeofparameter.298.2.4.1RangeofparametersforEGPRS.308.3Aspectsofdiscontinuoustransmission(DTX).338.4Measurementreporting.338.4.1MeasurementreportingfortheMSonaTCH.338.4.1.1MeasurementreportingfortheMSonanE-TCHinFPCmode.348.4.2MeasurementreportingfortheMSonaSDCCH.358.4.3AdditionalcellreportingrequirementsformultibandMS.358.4.4CommonaspectsfortheMSonaTCHoraSDCCH.368.4.5MeasurementreportingfortheBSS.368.4.6Extendedmeasurementreporting.368.4.7AdditionalcellreportingrequirementsformultimodeMS.378.4.8EnhancedMeasurementReporting.378.4.8.1ReportingPriority.378.4.8.2MeasurementReporting.388.5AbsoluteMS-BTSdistance.398.5.1General.398.5.2Physicalparameter.399Controlparameters.4010GPRSmodetasks.4210.1CellRe-selection.4210.1.1MonitoringthereceivedsignallevelandPBCCHdata.4310.1.1.1Packetidlemode.4310.1.1.2Packettransfermode.4410.1.2CellRe-selectionCriteria.4510.1.3CellRe-selectionAlgorithm.4610.1.3.1Abnormalcellreselection.4710.1.3.1aAlgorithmforcellre-selectionfromGSMtoUTRAN.4710.1.4NetworkcontrolledCellre-selection.4810.1.4.1Measurementreporting.4810.1.4.2Cellre-selectioncommand.4910.1.4.3Exceptionalcases.4910.1.5ExtendedMeasurementreporting.5010.2RFPowerControl.5110.2.1MSoutputpower.5110.2.2BTSoutputpower.5210.2.3MeasurementsatMSside.5310.2.3.1DerivingtheCvalue.5310.2.3.1.1Packetidlemode.5310.2.3.1.2Packettransfermode.5410.2.3.2DerivationofChannelQualityReport.5510.2.3.2.1Packettransfermode.5510.2.3.2.2Packetidlemode.5810.2.3.2.3Measurementreporting.5910.2.4MeasurementsatBSSside.5910.3Measurementrequirements.5910.4Controlparameters.6011CTSmodetasks.6211.1CTSidlemodetasks.6211.1.1CTScellselection.6211.1.1.1SynchronizationandmeasurementsforCTScellselection.6211.1.1.2InitialsychronizationofCTS-MS.6211.1.2CriterionforCTScellselection.6311.1.3MonitoringofCTSBCHandCTSPCH.6311.1.3.1Monitoringofreceivedsignallevel.63SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)5(GSM05.08version8.4.1Release1999)11.1.3.2Downlinkbeaconfailure.6311.1.3.3Downlinkpagingfailure.6311.1.4ProcedureswithreportingtotheCTS-FP.6411.1.4.1AFAmonitoring.6411.1.4.2BCCHdetection.6411.1.4.3ObservedFrequencyOffset(OFO)measurement.6411.2Intra-cellhandover.6511.2.1Overallprocess.6511.2.2CTS-MSmeasurementprocedure.6511.2.3CTS-FPmeasurementprocedure.6511.2.4Strategy.6511.3RFpowercontrol.6511.3.1Overallprocess.6511.3.2CTS-MSimplementation.6511.3.3CTS-MSpowercontrolrange.6611.3.4CTS-FPimplementation.6611.3.5CTS-FPpowercontrolrange.6611.3.6Strategy.6611.3.7Timing.6611.4Radiolinkfailure.6711.4.1Criterion.6711.4.2CTS-MSprocedure.6711.4.3CTS-FPprocedure.6711.5Radiolinkmeasurements.6711.5.1Signalstrength.6711.5.1.1General.6711.5.1.2Physicalparameter.6811.5.1.3Statisticalparameters.6811.5.1.4Rangeofparameter.6811.5.2Signalquality.6811.5.2.1General.6811.5.2.2Physicalparameter.6811.5.2.3Statisticalparameters.6811.5.2.4Rangeofparameter.6811.5.3Aspectsofdiscontinuoustransmission(DTX).6811.5.4MeasurementreportingfortheCTS-MSonaTCH.6811.6ControlofCTS-FPservicerange.6911.7Controlparameters.6912COMPACTModeTasks.7112.1Introduction.7112.2NetworkPre-requisites.7112.2.1CPBCCHcarriers.7112.3COMPACTIdleModeTasks.7112.3.1Introduction.7112.3.2MeasurementsforCOMPACTCellSelection.7112.3.3MeasurementsforCOMPACTStoredListCellSelection.7212.3.4CriteriaforCOMPACTCellSelection.7212.3.5DownlinkSignallingFailure.7212.4COMPACTCellReselection.7212.4.1MonitoringthereceivedsignallevelandCPBCCHdata.7312.4.1.1Packetidlemode.7312.4.1.2Packettransfermode.7312.4.2COMPACTcellreselectioncriteria.7412.4.3COMPACTcellreselectionalgorithm.7412.4.4NetworkcontrolledCellreselection.7412.4.5COMPACTcellreselectionmeasurementopportunities.74SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)6(GSM05.08version8.4.1Release1999)AnnexA(informative):DefinitionofabasicGSMorDCS1800handoverandRFpowercontrolalgorithm.75A.1Scope.75A.2Functionalrequirement.75A.3BSSpre-processingandthresholdcomparisons.76A.3.1Measurementaveragingprocess.76A.3.2Thresholdcomparisonprocess.77A.3.2.1RFpowercontrolprocess.77A.3.2.2HandoverProcess.78A.4BSSdecisionalgorithm.79A.4.1Internalintracellhandoveraccordingtoradiocriteria:(Interferenceproblems).80A.4.2Internalhandoveraccordingtoothercriteria.80A.4.3Generalconsiderations.80A.5Channelallocation.80A.6HandoverdecisionalgorithmintheMSC.81AnnexB(informative):PowerControlProcedures.83B.1Openloopcontrol.83B.2Closedloopcontrol.84B.3Qualitybasedcontrol.84B.4BTSpowercontrol.85B.5Example.85B.6InterworkingbetweennormalandfastpowercontrolforECSD.86AnnexC(informative):ExampleInterferenceMeasurementAlgorithm.88AnnexD(informative):ExampleSelectionofModulationandCodingSchemesbasedonLinkQualityReports.89AnnexE(informative):Changecontrolhistory.90History.93SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)7(GSM05.08version8.4.1Release1999)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).ThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)ofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenbere-submittedforformalapprovalproceduresbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version8.x.ywhere:8GSMPhase2+Release1999.xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:29September2000DateoflatestannouncementofthisEN(doa):31December2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30June2001DateofwithdrawalofanyconflictingNationalStandard(dow):30June2001SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)8(GSM05.08version8.4.1Release1999)1ScopeThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)ofthedigitalcellulartelecommunicationssystemsGSM.Unlessotherwisespecified,referencestoGSMalsoincludeincludeoperationinanyband.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1999document,referencestoGSMdocumentsareforRelease1999versions(version8.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.03:"Digitalcellulartelecommunicationssystem(Phase2+);Numbering,addressingandidentification".[3]GSM03.09:"Digitalcellulartelecommunicationssystem(Phase2+);Handoverprocedures".[4]GSM03.22:"Digitalcellulartelecommunicationssystem(Phase2+);FunctionsrelatedtoMobileStation(MS)inidlemodeandgroupreceivemode".[5]GSM04.04:"Digitalcellulartelecommunicationssystem(Phase2+);Layer1;Generalrequirements".[6]GSM04.06:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interface;DataLink(DL)layerspecification".[7]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[8]GSM05.02:"Digitalcellulartelecommunicationssystem(Phase2+);Multiplexingandmultipleaccessontheradiopath".[9]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[10]GSM05.10:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization".[11]GSM06.11:"Digitalcellulartelecommunicationssystem;Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[12]GSM08.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobile-servicesSwitchingCentre-BaseStationSystem(MSC-BSS)interface,Layer3specification".[13]GSM08.58:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Layer3specification".SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)9(GSM05.08version8.4.1Release1999)[14]GSM11.10:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation(MS)conformityspecification".[15]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);OveralldescriptionoftheGPRSRadioInterface;Stage2".[16]GSM03.52:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;LowerlayersoftheCTSRadioInterface;Stage2".[17]GSM04.56:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;CTSradiointerfacelayer3specification".[18]GSM05.56:"Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;CTS-FPradiosubsystem".[19]TIA/EIA/IS-2000-5-A:"UpperLayer(Layer3)SignalingStandardforcdma2000SpreadSpectrumSystems".[20]TIA/EIA/IS-833:"Multi-CarrierSpecificationforSpreadSpectrumSystemsonGSMMAP(MC-MAP)(LowerLayersAirInterface)".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2GeneralTheradiosub-systemlinkcontrolaspectsthatareaddressedareasfollows:-Handover;-RFPowercontrol,includingfastpowercontrolforECSD;-RadiolinkFailure;-Cellselectionandre-selectioninIdlemode,inGroupReceivemodeandinGPRSmode(seeGSM03.22);-CTSmodetasks.HandoverisrequiredtomaintainacallinprogressasaMSengagedinapoint-to-pointcallorwithaccesstotheuplinkofachannelusedforavoicegroupcallpassesfromonecellcoverageareatoanotherandmayalsobeemployedtomeetnetworkmanagementrequirements,e.g.reliefofcongestion.HandovermayoccurduringacallfromoneTCHormultipleTCHs(inthecaseofmultislotconfiguration)toanotherTCHormultipleTCHs.ItmayalsooccurfromDCCHtoDCCHorfromDCCHtooneormultipleTCH(s),e.g.duringtheinitialsignallingperiodatcallset-up.Thehandovermaybeeitherfromchannel(s)ononecelltootherchannel(s)onasurroundingcell,orbetweenchannelsonthesamecellwhicharecarriedonthesamefrequencyband.Examplesaregivenofhandoverstrategies,however,thesewillbedeterminedindetailbythenetworkoperator.ForamultibandMS,specifiedinGSM02.06,thehandoverdescribedisalsoallowedbetweenanychannelsondifferentcellswhicharecarriedondifferentfrequencybands,e.g.betweenaGSM900/TCHandaDCS1800/TCH.Handoverbetweentwoco-locatedcells,carriedondifferentfrequencybands,isconsideredasinter-cellhandoverirrespectiveofthehandoverproceduresused.ForamultimodeMS,handoverisallowedbetweenGSMandotherradioaccesstechnologies.AdaptivecontroloftheRFtransmitpowerfromanMSandoptionallyfromtheBSSisimplementedinordertooptimizetheuplinkanddownlinkperformanceandminimizetheeffectsofco-channelinterferenceinthesystem.SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)10(GSM05.08version8.4.1Release1999)Thecriteriafordeterminingradiolinkfailurearespecifiedinordertoensurethatcallswhichfaileitherfromlossofradiocoverageorunacceptableinterferencearesatisfactorilyhandledbythenetwork.Radiolinkfailuremayresultineitherre-establishmentorreleaseofthecallinprogress.Forchannelsusedforavoicegroupcall,anradiouplinkfailureresultsinthefreeingupoftheuplink.Proceduresforcellselectionandre-selectionwhilstinIdlemode(i.e.notactivelyprocessingacall),arespecifiedinordertoensurethatamobileiscampedonacellwithwhichitcanreliablycommunicateonboththeradiouplinkanddownlink.TheoperationsofanMSinIdleModearespecifiedinGSM03.22.Cellre-selectionisalsoperformedbytheMSwhenattachedtoGPRS,exceptwhentheMSsimultaneouslyhasacircuitswitchedconnection.Optionalproceduresarealsospecifiedfornetworkcontrolledcellre-selectionforGPRS.Cellre-selectionforGPRSisdefinedinclause10.1.ForamultimodeMS,cellselectionandre-selectionisallowedbetweenGSMandotherradioaccesstechnologies.AnMSlisteningtoavoicegroupcalloravoicebroadcastusecellre-selectionprocedurestochangecell.Thismaybesupportedbyalistofcellscarryingthevoicegrouporvoicebroadcastcalldownlink,providedtotheMSbythenetwork.TheoperationsofanMSinGroupReceiveModearespecifiedinGSM03.22.InformationsignalledbetweentheMSandBSSissummarizedintables1,2and3.AfullspecificationoftheLayer1headerisgiveninGSM04.04,andoftheLayer3fieldsinGSM04.08.ForCTS,informationsignalledbetweentheCTS-MSandCTS-FPissummarizedintables4,5and6.AfullspecificationoftheCTSLayer3fieldsisgiveninGSM04.56.ForCOMPACT,specificproceduresaredefinedinclause12.SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)11(GSM05.08version8.4.1Release1999)3Handover3.1OverallprocessTheoverallhandoverprocessisimplementedintheMS,BSSandMSC.Measurementofradiosubsystemdownlinkperformanceandsignallevelsreceivedfromsurroundingcells,ismadeintheMS.ThesemeasurementsaresignalledtotheBSSforassessment.TheBSSmeasurestheuplinkperformancefortheMSbeingservedandalsoassessesthesignallevelofinterferenceonitsidletrafficchannels.InitialassessmentofthemeasurementsinconjunctionwithdefinedthresholdsandhandoverstrategymaybeperformedintheBSS.AssessmentrequiringmeasurementresultsfromotherBTSorotherinformationresidentintheMSC,maybeperformedintheMSC.GSM03.09describesthehandoverprocedurestobeusedinPLMNs.3.2MSmeasurementprocedureAprocedureshallbeimplementedintheMSbywhichitmonitorsthedownlinkRXsignallevelandqualityfromitsservingcellandthedownlinkRXsignallevelandBSICofsurroundingBTS.ThemethodofidentificationofsurroundingBTSisdescribedinclause7.2.TherequirementsfortheMSmeasurementsaregiveninclause8.1.3.3BSSmeasurementprocedureAprocedureshallbeimplementedintheBSSbywhichitmonitorstheuplinkRXsignallevelandqualityfromeachMSbeingservedbythecell.Inthecaseofamultislotconfigurationtheevaluationshallbeperformedonatimeslotpertimeslotbasis.AprocedureshallbeimplementedbywhichtheBSSmonitorsthelevelsofinterferenceonitsidletrafficchannels.3.4StrategyThehandoverstrategyemployedbythenetworkforradiolinkcontroldeterminesthehandoverdecisionthatwillbemadebasedonthemeasurementresultsreportedbytheMS/BSSandvariousparameterssetforeachcell.Networkdirectedhandovermayalsooccurforreasonsotherthanradiolinkcontrol,e.g.tocontroltrafficdistributionbetweencells.Theexacthandoverstrategieswillbedeterminedbythenetworkoperator,adetailedexampleofabasicoverallalgorithmappearsinannexA.Possibletypesofhandoverareasfollows:Inter-cellhandover:IntercellhandoverfromtheservingcelltoasurroundingcellwillnormallyoccureitherwhenthehandovermeasurementsshowlowRXLEVand/orRXQUALonthecurrentservingcellandabetterRXLEVavailablefromasurroundingcell,orwhenasurroundingcellallowscommunicationwithalowerTXpowerlevel.ThistypicallyindicatesthatanMSisontheborderofthecellarea.IntercellhandovermayalsooccurfromtheDCCHontheservingcelltoaTCHormultislotconfigurationonanothercellduringcallestablishment.ThismaybeusedasameansofprovidingsuccessfulcallestablishmentwhennosuitableTCHresourceisavailableonthecurrentservingcell.Inter-cellhandoverbetweencellsusingdifferentfrequencybandsisallowedforamultibandMS.Inter-cellhandoverbetweencellsusingdifferentradioaccesstechnologiesisallowedforamultimodeMS.Intra-cellhandover:Intra-cellhandoverfromonechannel/timeslotintheservingcelltoanotherchannel/timeslotinthesamecellwillnormallybeperformedifthehandovermeasurementsshowalowRXQUAL,butahighRXLEVontheservingcell.ThisindicatesadegradationofqualitycausedbyinterferenceeventhoughtheMSissituatedwithintheservingcell.Theintra-cellhandovershouldprovideachannelwithalowerlevelofinterference.Intra-cellhandovercanoccureithertoatimeslotonanewcarrierortoadifferenttimeslotonthesamecarrier.Similarly,intra-cellhandovermayoccurbetweendifferentmultislotconfigurationsinthesamecell.Thesemultislotconfigurationsmaycomprisedifferentnumberoftimeslotsandmaypartlyoverlap.Intra-cellhandoverfromoneofthebandsofoperationtoanotheroneisallowedforamultibandMS.SIST EN 300 911 V8.4.1:2003

ETSIETSIEN300911V8.4.1(2000-10)12(GSM05.08version8.4.1Release1999)GSM08.08definesthecausesforhandoverthatmaybesignalledfromBSStoMSC.4RFpowercontrol4.1OverallprocessRFpowercontrolisemployedtominimizethetransmitpowerrequiredbyMSorBSSwhilstmaintainingthequalityoftheradiolinks.Byminimizingthetransmitpowerlevels,interferencetoco-channelusersisreduced.4.2MSimplementationRFpowercontrolshallbeimplementedintheMS.ThepowercontrolleveltobeemployedbytheMSoneachuplinkchannel,exceptPDCH,isindicatedbymeansofthepowercontrolinformationsenteitherinthelayer1headerofeachSACCHmessageblock(seeGSM04.04)onthecorrespondingdownlinkchannel,orinadedicatedsignallingblock(seeGSM04.08).PowercontrolforPDCHisdefinedinclause10.2.TheMSshallemploythemostrecentlycommandedpowercontrollevelappropriatetoeachchannelforalltransmittedburstsoneitheraTCH(includinghandoveraccessburst),FACCH,SACCHorSDCCH.TheMSshallconfirmthepowercontrollevelthatitiscurrentlyemployingintheSACCHL1headeroneachuplinkchannel.TheindicatedvalueshallbethepowercontrollevelactuallyusedbythemobileforthelastburstofthepreviousSACCHperiod.IntheE-TCHmode,theMSshall,ifsoindicatedbytheBSSintheSACCHL1header(seeGSM04.04)orAssignmentcommand(seeGSM04.18),useFPC(fastpowercontrol).TheMSshallemploythemostrecentlycommandedfastpowercontrolleveloneachuplinkE-TCHchannel.ThepowercontrolleveltobeemployedbytheMSisindicatedbymeansofthepowercontrolinformationsentviaE-IACCHonceeveryFPCreportingperiod(seeclause4.7).IfFPCisinuse,theMSshallreport,intheSACCHL1header,thepowercontrollevelusedattheendofthenormalpowercontrolreportingperiod.IntheE.TCHmodeandchannelcodingasymmetryconfigurationusing8PSKforuplink,theMSshallE-IACCHinuplinkforfastmeasurementrepoting.NOTE:Theterm"normalpowercontrol"isusedinthisspecificationonlyforclarificationandisotherwis
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