ETSI EN 300 911 V6.8.1 (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 6.8.1 Release 1997)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 6.8.1SIST EN 300 911 V6.8.1:2003en01-december-2003SIST EN 300 911 V6.8.1:2003SLOVENSKI
STANDARD
ETSIEN300911V6.8.1(2000-10)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol(GSM05.08version6.8.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)2(GSM05.08version6.8.1Release1997)ReferenceREN/SMG-020508Q6R6KeywordsDigitalcellulartelecommunicationssystem,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 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)3(GSM05.08version6.8.1Release1997)ContentsIntellectualPropertyRights.6Foreword.61Scope.71.1References.71.2Abbreviations.82General.83Handover.93.1Overallprocess.93.2MSmeasurementprocedure.93.3BSSmeasurementprocedure.93.4Strategy.94RFpowercontrol.104.1Overallprocess.104.2MSimplementation.104.3MSpowercontrolrange.104.4BSSimplementation.104.5BSSpowercontrolrange.104.6Strategy.114.7Timing.114.8Dedicatedchannelsusedforavoicegroupcallorvoicebroadcast.115Radiolinkfailure.115.1Criterion.115.2MSprocedure.125.3BSSprocedure.126Idlemodetasks.136.1Introduction.136.2Measurementsfornormalcellselection.136.3Measurementsforstoredlistcellselection.146.4Criteriaforcellselectionandreselection.146.5Downlinksignallingfailure.156.6MeasurementsforCellReselection.166.6.1MonitoringofreceivedsignallevelandBCCHdata.166.6.2Pathlosscriteriaandtimingsforcellre-selection.176.7ReleaseofTCHandSDCCH.176.7.1Normalcase.176.7.2Callre-establishment.186.8Abnormalcasesandemergencycalls.187Networkpre-requisites.197.1BCCHcarriers.197.2IdentificationofsurroundingBSSforhandovermeasurements.198Radiolinkmeasurements.208.1Signallevel.208.1.1General.208.1.2Physicalparameter.208.1.3Statisticalparameters.218.1.4Rangeofparameter.228.2Signalquality.228.2.1General.228.2.2Physicalparameter.228.2.3Statisticalparameters.228.2.4Rangeofparameter.22SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)4(GSM05.08version6.8.1Release1997)8.3Aspectsofdiscontinuoustransmission(DTX).238.4Measurementreporting.248.4.1MeasurementreportingfortheMSonaTCH.248.4.2MeasurementreportingfortheMSonaSDCCH.258.4.3AdditionalcellreportingrequirementsformultibandMS.258.4.4CommonaspectsfortheMSonaTCHoraSDCCH.268.4.5MeasurementreportingfortheBSS.268.4.6Extendedmeasurementreporting.268.5AbsoluteMS-BTSdistance.278.5.1General.278.5.2Physicalparameter.279Controlparameters.2810GPRSmodetasks.3010.1CellRe-selection.3010.1.1MonitoringthereceivedsignallevelandPBCCHdata.3010.1.1.1Packetidlemode.3010.1.1.2Packettransfermode.3110.1.2CellRe-selectionCriteria.3210.1.3CellRe-selectionAlgorithm.3310.1.3.1Abnormalcellreselection.3410.1.4NetworkcontrolledCellre-selection.3410.1.4.1Measurementreporting.3510.1.4.2Cellre-selectioncommand.3510.1.4.3Exceptionalcases.3610.1.5ExtendedMeasurementreporting.3610.2RFPowerControl.3710.2.1MSoutputpower.3710.2.2BTSoutputpower.3810.2.3MeasurementsatMSside.3910.2.3.1DerivingtheCvalue.3910.2.3.1.1Packetidlemode.3910.2.3.1.2Packettransfermode.4010.2.3.2DerivationofChannelQualityReport.4110.2.3.2.1Packettransfermode.4110.2.3.2.2Packetidlemode.4210.2.3.2.3Measurementreporting.4310.2.4MeasurementsatBSSside.4310.3Measurementrequirements.4310.4Controlparameters.44AnnexA(informative):DefinitionofabasicGSMorDCS1800handoverandRFpowercontrolalgorithm.46A.1Scope.46A.2Functionalrequirement.46A.3BSSpre-processingandthresholdcomparisons.47A.3.1Measurementaveragingprocess.47A.3.2Thresholdcomparisonprocess.48A.3.2.1RFpowercontrolprocess.48A.3.2.2HandoverProcess.49A.4BSSdecisionalgorithm.50A.4.1Internalintracellhandoveraccordingtoradiocriteria:(Interferenceproblems).51A.4.2Internalhandoveraccordingtoothercriteria.51A.4.3Generalconsiderations.51SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)5(GSM05.08version6.8.1Release1997)A.5Channelallocation.51A.6HandoverdecisionalgorithmintheMSC.52AnnexB(informative):PowerControlProcedures.54B.1Openloopcontrol.54B.2Closedloopcontrol.55B.3Qualitybasedcontrol.55B.4BTSpowercontrol.56B.5Example.56AnnexC(informative):ChangeRequestHistory.58History.60SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)6(GSM05.08version6.8.1Release1997)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:Version6.x.ywhere:6GSMPhase2+Release1997.xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:29September2000DateoflatestannouncementofthisEN(doa):31December2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30June2001DateofwithdrawalofanyconflictingNationalStandard(dow):30June2001SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)7(GSM05.08version6.8.1Release1997)1ScopeThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)oftheGSMandDCS1800systems.Unlessotherwisespecified,referencestoGSMalsoincludeDCS1800.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1997document,referencestoGSMdocumentsareforRelease1997versions(version6.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 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)8(GSM05.08version6.8.1Release1997)[14]GSM11.10:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation(MS)conformityspecification".[15]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);OveralldescriptionoftheGPRSRadioInterface;Stage2".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2GeneralTheradiosub-systemlinkcontrolaspectsthatareaddressedareasfollows:-Handover;-RFPowercontrol;-RadiolinkFailure;-Cellselectionandre-selectioninIdlemode,inGroupReceivemodeandinGPRSmode(seeGSM03.22).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.AdaptivecontroloftheRFtransmitpowerfromanMSandoptionallyfromtheBSSisimplementedinordertooptimizetheuplinkanddownlinkperformanceandminimizetheeffectsofco-channelinterferenceinthesystem.Thecriteriafordeterminingradiolinkfailurearespecifiedinordertoensurethatcallswhichfaileitherfromlossofradiocoverageorunacceptableinterferencearesatisfactorilyhandledbythenetwork.Radiolinkfailuremayresultineitherre-establishmentorreleaseofthecallinprogress.Forchannelsusedforavoicegroupcall,anradiouplinkfailureresultsinthefreeingupoftheuplink.Proceduresforcellselectionandre-selectionwhilstinIdlemode(i.e.notactivelyprocessingacall),arespecifiedinordertoensurethatamobileiscampedonacellwithwhichitcanreliablycommunicateonboththeradiouplinkanddownlink.TheoperationsofanMSinIdleModearespecifiedinGSM03.22.Cellre-selectionisalsoperformedbytheMSwhenattachedtoGPRS,exceptwhentheMSsimultaneouslyhasacircuitswitchedconnection.Optionalproceduresarealsospecifiedfornetworkcontrolledcellre-selectionforGPRS.Cellre-selectionforGPRSisdefinedinsubclause10.1.AnMSlisteningtoavoicegroupcalloravoicebroadcastusecellre-selectionprocedurestochangecell.Thismaybesupportedbyalistofcellscarryingthevoicegrouporvoicebroadcastcalldownlink,providedtotheMSbythenetwork.TheoperationsofanMSinGroupReceiveModearespecifiedinGSM03.22.InformationsignalledbetweentheMSandBSSissummarizedintables1,2and3.AfullspecificationoftheLayer1headerisgiveninGSM04.04,andoftheLayer3fieldsinGSM04.08.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)9(GSM05.08version6.8.1Release1997)3Handover3.1OverallprocessTheoverallhandoverprocessisimplementedintheMS,BSSandMSC.Measurementofradiosubsystemdownlinkperformanceandsignallevelsreceivedfromsurroundingcells,ismadeintheMS.ThesemeasurementsaresignalledtotheBSSforassessment.TheBSSmeasurestheuplinkperformancefortheMSbeingservedandalsoassessesthesignallevelofinterferenceonitsidletrafficchannels.InitialassessmentofthemeasurementsinconjunctionwithdefinedthresholdsandhandoverstrategymaybeperformedintheBSS.AssessmentrequiringmeasurementresultsfromotherBTSorotherinformationresidentintheMSC,maybeperformedintheMSC.GSM03.09describesthehandoverprocedurestobeusedinPLMNs.3.2MSmeasurementprocedureAprocedureshallbeimplementedintheMSbywhichitmonitorsthedownlinkRXsignallevelandqualityfromitsservingcellandthedownlinkRXsignallevelandBSICofsurroundingBTS.ThemethodofidentificationofsurroundingBTSisdescribedinsubclause7.2.TherequirementsfortheMSmeasurementsaregiveninsubclause8.1.3.3BSSmeasurementprocedureAprocedureshallbeimplementedintheBSSbywhichitmonitorstheuplinkRXsignallevelandqualityfromeachMSbeingservedbythecell.Inthecaseofamultislotconfigurationtheevaluationshallbeperformedonatimeslotpertimeslotbasis.AprocedureshallbeimplementedbywhichtheBSSmonitorsthelevelsofinterferenceonitsidletrafficchannels.3.4StrategyThehandoverstrategyemployedbythenetworkforradiolinkcontroldeterminesthehandoverdecisionthatwillbemadebasedonthemeasurementresultsreportedbytheMS/BSSandvariousparameterssetforeachcell.Networkdirectedhandovermayalsooccurforreasonsotherthanradiolinkcontrol,e.g.tocontroltrafficdistributionbetweencells.Theexacthandoverstrategieswillbedeterminedbythenetworkoperator,adetailedexampleofabasicoverallalgorithmappearsinannexA.Possibletypesofhandoverareasfollows:Inter-cellhandover:IntercellhandoverfromtheservingcelltoasurroundingcellwillnormallyoccureitherwhenthehandovermeasurementsshowlowRXLEVand/orRXQUALonthecurrentservingcellandabetterRXLEVavailablefromasurroundingcell,orwhenasurroundingcellallowscommunicationwithalowerTXpowerlevel.ThistypicallyindicatesthatanMSisontheborderofthecellarea.IntercellhandovermayalsooccurfromtheDCCHontheservingcelltoaTCHormultislotconfigurationonanothercellduringcallestablishment.ThismaybeusedasameansofprovidingsuccessfulcallestablishmentwhennoTCHresourceisavailableonthecurrentservingcell.Inter-cellhandoverbetweencellsusingdifferentfrequencybandsisallowedforamultibandMS.Intra-cellhandover:Intra-cellhandoverfromonechannel/timeslotintheservingcelltoanotherchannel/timeslotinthesamecellwillnormallybeperformedifthehandovermeasurementsshowalowRXQUAL,butahighRXLEVontheservingcell.ThisindicatesadegradationofqualitycausedbyinterferenceeventhoughtheMSissituatedwithintheservingcell.Theintra-cellhandovershouldprovideachannelwithalowerlevelofinterference.Intra-cellhandovercanoccureithertoatimeslotonanewcarrierortoadifferenttimeslotonthesamecarrier.Similarly,intra-cellhandovermayoccurbetweendifferentmultislotconfigurationsinthesamecell.Thesemultislotconfigurationsmaycomprisedifferentnumberoftimeslotsandmaypartlyoverlap.Intra-cellhandoverfromoneofthebandsofoperationtoanotheroneisallowedforamultibandMS.GSM08.08definesthecausesforhandoverthatmaybesignalledfromBSStoMSC.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)10(GSM05.08version6.8.1Release1997)4RFpowercontrol4.1OverallprocessRFpowercontrolisemployedtominimizethetransmitpowerrequiredbyMSorBSSwhilstmaintainingthequalityoftheradiolinks.Byminimizingthetransmitpowerlevels,interferencetoco-channelusersisreduced.4.2MSimplementationRFpowercontrolshallbeimplementedintheMS.ThepowercontrolleveltobeemployedbytheMSoneachuplinkchannel,exceptPDCH,isindicatedbymeansofthepowercontrolinformationsenteitherinthelayer1headerofeachSACCHmessageblock(seeGSM04.04)onthecorrespondingdownlinkchannel,orinadedicatedsignallingblock(seeGSM04.08).PowercontrolforPDCHisdefinedinsubclause10.2.TheMSshallemploythemostrecentlycommandedpowercontrollevelappropriatetoeachchannelforalltransmittedburstsoneitheraTCH(includinghandoveraccessburst),FACCH,SACCHorSDCCH.TheMSshallconfirmthepowercontrollevelthatitiscurrentlyemployingintheSACCHL1headeroneachuplinkchannel.TheindicatedvalueshallbethepowercontrollevelactuallyusedbythemobileforthelastburstofthepreviousSACCHperiod.Incaseofamultislotconfiguration,eachbi-directionalchannelshallbepowercontrolledindividuallybythecorrespondingSACCH.Powercontrolinformationondownlinkunidirectionalchannelsshallbeneglected.WhenaccessingacellontheRACH(randomaccess)andbeforereceivingthefirstpowercommandduringacommunicationonaDCCHorTCH(afteranIMMEDIATEASSIGNMENT),allGSMandclass1andclass2DCS1800MSshallusethepowerleveldefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell.Theclass3DCS1800MSshallusethepowerleveldefinedbyMSTXPWRMAXCCHplusthevaluePOWEROFFSETalsobroadcastontheBCCHofthecell.IfapowercontrolleveldefinedinGSM05.05isreceivedbutthelevelisnotsupportedbytheMS,theMSshallusethesupportedoutputpowerwhichisclosesttotheoutputpowerindicatedbythereceivedpowercontrollevel.4.3MSpowercontrolrangeTherangeoverwhichaMSshallbecapableofvaryingitsRFoutputpowershallbefromitsmaximumoutputdowntoitsminimum,instepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.4.4BSSimplementationRFpowercontrolmayoptionallybeimplementedintheBSS.4.5BSSpowercontrolrangeTherangeoverwhichtheBSSshallbecapableofreducingitsRFoutputpowerfromitsmaximumlevelshallbenominally30dB,in15stepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)11(GSM05.08version6.8.1Release1997)4.6StrategyTheRFpowercontrolstrategyemployedbythenetworkdeterminestheorderedpowerlevelthatissignalledtotheMS,andthepowerlevelthatisemployedbytheBSS.ThepowerleveltobeemployedineachcasewillbebasedonthemeasurementresultsreportedbytheMS/BTSandvariousparameterssetforeachcell.Theexactstrategieswillbedeterminedbythenetworkoperator.AdetailedexampleofabasicalgorithmappearsinannexA.4.7TimingUponreceiptofacommandfromanSACCHtochangeitspowerlevelonthecorrespondinguplinkchannel,theMSshallchangetothenewlevelatarateofonenominal2dBpowercontrolstepevery60ms(13TDMAframes),i.e.arangechangeof15stepsshouldtakeabout900ms.ThechangeshallcommenceatthefirstTDMAframebelongingtothenextreportingperiod(asspecifiedinsubclause8.4).TheMSshallchangethepoweronenominal2dBstepatatime,atarateofonestepevery60msfollowingtheinitialchange,irrespectiveofwhetheractualtransmissiontakesplaceornot.Incaseofchannelchange,exceptformultislotconfigurationchange,thecommandedpowercontrollevelshallbeappliedoneachnewchannelimmediately.ThemultislotconfigurationchangemessagedoesnotcommandtheMStousenewpowercontrollevels.ForthosetimeslotsnotusedbytheMSbeforethemultislotconfigurationchangeprocedure,theMSshallusethepowercontrollevelusedonthemainchannelbeforethemultislotconfigurationchange.4.8DedicatedchannelsusedforavoicegroupcallorvoicebroadcastThenetworkshallnotallocatetheuplinkofthechannelusedforavoicegroupcalltomorethanoneMS.Ifmarkedbusy,nootherMSshalltransmitonthechannel.Thismarkingisindicatedbythenetwork,asdefinedinGSM03.68and04.08.AnyMSallocatedtheuplinkofachannelusedforavoicegroupcallshallonlytransmitiftheuplinkismarkedbusy,andshallstopusingtheuplinkifithappenstobecomemarkedfree.AnMSnotallocatedtheuplinkmayperformarandomaccessprocedureontheuplinktogainaccesstotalk,onlyiftheuplinkismarkedasfree.Onachannelusedduringavoicegroupcall,theuplinkpowercontrolshallonlyapplytotheMScurrentlyallocatedthatuplink,andtheMSpowercontrollevelorderedbythenetworkshallbeignoredbyallotherMSslisteningtothedownlink.Whenperformingarandomaccessonacelltogainaccesstotheuplinkofachannelusedforavoicegroupcall,untilreceivingthefirstdedicatedpowercommandfromthenetwork,theMSshallusethelastreceivedpowerlevelcommandasdefinedbytheMS_TXPWR_MAX_CCHparameterbroadcastontheBCCHofthecell,orifMS_TXPWR_MAX_CCHcorrespondstoapowercontrollevelnotsupportedbytheMSasdefinedbyitspowerclassinGSM05.05,theMSshallactasthoughtheclosestsupportedpowercontrollevelhadbeenbroadcast.RFdownlinkpowercontrolwillnormallynotbeappliedonchannelsusedforavoicegroupcallorvoicebroadcast.5Radiolinkfailure5.1CriterionThecriterionfordeterminingRadioLinkFailureintheMSshallbebasedonthesuccessrateofdecodingmessagesonthedownlinkSACCH.Foracircuitswitchedmultislotconfiguration,onlythemainSACCHshallbeusedfordeterminingRadioLinkFailure.ForGPRS,RadioLinkFailureisdeterminedbytheRLC/MACprotocol(seeGSM04.60).SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)12(GSM05.08version6.8.1Release1997)5.2MSprocedureTheaimofdeterminingradiolinkfailureintheMSistoensurethatcallswithunacceptablevoice/dataquality,whichcannotbeimprovedeitherbyRFpowercontrolorhandover,areeitherre-establishedorreleasedinadefinedmanner.Ingeneraltheparametersthatcontroltheforcedreleaseshouldbesetsuchthattheforcedreleasewillnotnormallyoccuruntilthecallhasdegradedtoaqualitybelowthatatwhichthemajorityofsubscriberswouldhavemanuallyreleased.Thisensuresthat,forexample,acallontheedgeofaradiocoveragearea,althoughofbadquality,canusuallybecompletedifthesubscriberwishes.TheradiolinkfailurecriterionisbasedontheradiolinkcounterS.IftheMSisunabletodecodeaSACCHmessage(BFI=1),Sisdecreasedby1.InthecaseofasuccessfulreceptionofaSACCHmessage(BFI=0)Sisincreasedby2.InanycaseSshallnotexceedthevalueofRADIO_LINK_TIMEOUT.IfSreaches0aradiolinkfailureshallbedeclared.TheactiontobetakenisspecifiedinGSM04.08.TheRADIO_LINK_TIMEOUTparameteristransmittedbyeachBSSintheBCCHdata(seetable1).TheMSshallcontinuetransmittingasnormalontheuplinkuntilSreaches0.ThealgorithmshallstartaftertheassignmentofadedicatedchannelandSshallbeinitializedtoRADIO_LINK_TIMEOUT.Thedetailedoperationshallbeasfollows:-Theradiolinktime-outalgorithmshallbestoppedatthereceptionofachannelchangecommand.-(Re-)initializationandstartofthealgorithmshallbedonewhenevertheMSswitchestoanewchannel(thisincludestheoldchannelinassignmentandhandoverfailurecases),atthelatestwhenthemainsignallinglink(seeGSM04.08)hasbeenestablished.-TheRADIO_LINK_TIMEOUTvalueusedat(re-)initializationshallbethatusedonthepreviouschannel(intheImmediateAssignmentcasethevaluereceivedontheBCCH),orthevaluereceivedonSACCHiftheMShasreceivedaRADIO_LINK_TIMEOUTvalueonthenewchannelbeforetheinitialization.-IfthefirstRADIO_LINK_TIMEOUTvalueontheSACCHisreceivedonthenewchannelaftertheinitialization,thecountershallbere-initializedwiththenewvalue.AnMSlisteningtoavoicegroupcalloravoicebroadcast,uponadownlinkradiolinkfailureshallreturntoidlemodeandperformcellre-selection.5.3BSSprocedureThecriteriafordeterminingradiolinkfailureintheBSSshouldbebaseduponeithertheerrorrateontheuplinkSACCH(s)oronRXLEV/RXQUALmeasurementsoftheMS.Theexactcriteriatobeemployedshallbedeterminedbythenetworkoperator.Forchannelsusedforavoicegroupcall,theradiolinkfailureproceduresintheBSSshallberesetuponthere-allocationoftheuplinktoanotherMS.Uponauplinkradiofailure,thenetworkshallmarkitasfree,seesubclause4.8.Whenevertheuplinkisnotused,andforchannelsusedforvoicebroadcast,theBSSradiolinkfailureproceduresshallnotapplyonthatchannel.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)13(GSM05.08version6.8.1Release1997)6Idlemodetasks6.1IntroductionWhilstinidlemode,anMSshallimplementthecellselectionandre-selectionproceduresdescribedinGSM03.22.Theseproceduresmakeuseofmeasurementsandsub-proceduresdescribedinthisclause.TheproceduresensurethattheMSiscampedonacellfromwhichitcanreliablydecodedownlinkdataandwithwhichithasahighprobabilityofcommunicationsontheuplink.OncetheMSiscampedonacell,accesstothenetworkisallowed.ThisclausemakesuseoftermsdefinedinGSM03.22.TheMSshallnotusethediscontinuousreception(DRX)modeofoperation(i.e.poweringitselfdownwhenitisnotexpectingpagingmessagesfromthenetwork)whileperformingthecellselectionalgorithmdefinedinGSM03.22.Howeveruseofpoweringdownispermittedatallothertimesinidlemode.Forthepurposeofcellselectionandreselection,theMSshallbecapableofdetectingandsynchronizingtoaBCCHcarrierandreadtheBCCHdataatreferencesensitivitylevelandreferenceinterferencelevelsasspecifiedinGSM05.05.AnMSinidlemodeshallalwaysfulfiltheperformancerequirementspecifiedinGSM05.05atlevelsdowntoreferencesensitivitylevelorreferenceinterferencelevel.Theallowederrorrates(seeGSM05.05)mightimpactthecellselectionandreselectionprocedure,e.g.triggercellreselection.Moreover,oneconsequenceoftheallowederrorratesisthatinthecaseofnofrequencyhoppingandaTU3(TU1.5forDCS1800)propagationprofileitcannotbeexpectedthatanMSwillrespondtopagingunlessthereceivedsignallevelis2dBhigherthanthespecifiedreferencelevel.Forthepurposesofcellselectionandreselection,theMSisrequiredtomaintainanaverageofreceivedsignallevelsforallmonitoredfrequencies.Thesequantitiestermedthe"receivedlevelaverages"(RLA_C),shallbeunweightedaveragesofthereceivedsignallevelsmeasuredindBm.Theaccuracyofthereceivedsignallevelmeasurementsforidlemodetasksshallbethesameasforradiolinkmeasurements(seesubclause8.1.2).Thetimesgiveninsubclauses6.2,6.3and6.6refertointernalprocessesintheMSrequiredtoensurethattheMScampsasquicklyaspossibletothemostappropriatecell.Forthecellselection,theMSshallbeabletoselectthecorrect(fourthstrongest)cellandbeabletorespondtopagingonthatcellwithin30secondsofswitchon,whenthethreestrongestcellsarenotsuitable.ThisassumesavalidSIMwithPINdisabledandidealradioconditions.Thetoleranceonallthetimingrequirementsinclause6is±10%,exceptforPENALTY_TIMEwhereitis±2s.6.2MeasurementsfornormalcellselectionThemeasurementsofthisclauseshallbeperformedbyanMSwhichhasnopriorknowledgeofwhichGSMorDCS1800RFchannelsareBCCHcarriers.TheMSshallsearchallRFchannelsinthesystem(124forP-GSM,174forE-GSM,194forR-GSM,and374forDCS1800),takereadingsofreceivedRFsignalleveloneachRFchannel,andcalculatetheRLA_Cforeach.TheaveragingisbasedonatleastfivemeasurementsamplesperRFcarrierspreadover3to5s,themeasurementsamplesfromthedifferentRFcarriersbeingspreadevenlyduringthisperiod.AmultibandMSshallsearchallchannelswithinitsbandsofoperationasspecifiedabove.Thenumberofchannelssearchedwillbethesumofchannelsoneachbandofoperation.BCCHcarrierscanbeidentifiedby,forexample,searchingforfrequencycorrectionbursts.OnfindingaBCCHcarrier,theMSshallattempttosynchronizetoitandreadtheBCCHdata.ThemaximumtimeallowedforsynchronizationtoaBCCHcarrieris0.5s,andthemaximumtimeallowedtoreadtheBCCHdata,whenbeingsynchronizedtoaBCCHcarrier,is1.9s.Anexceptionisallowedforsysteminformationmessagesthatarebroadcastonlyonceeverynth(n>1)occurrenceofthe8multiframes(seeGSM05.02).Forthesesysteminformationmessagesthealloweddecodingtimeisextendedaccordingtotheappliedschedulingofthesysteminformationbroadcast,i.e.n*1.9s.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)14(GSM05.08version6.8.1Release1997)6.3MeasurementsforstoredlistcellselectionTheMSmayincludeoptionalstorageofBCCHcarrierinformationwhenswitchedoffasdetailedinGSM03.22.Forexample,theMSmaystoretheBCCHcarriersinusebythePLMNselectedwhenitwaslastactiveintheGSM900orDCS1800network.TheBCCHlistmayincludeBCCHcarriersfrommorethanonebandinamultibandoperationPLMN.AMSmayalsostoreBCCHcarriersformorethanonePLMNwhichithasselectedpreviously(e.g.atnationalbordersorwhenmorethanonePLMNservesacountry),inwhichcasetheBCCHcarrierlistsmustbekeptquiteseparate.ThestoredBCCHcarrierinformationusedbytheMSmaybederivedbyavarietyofdifferentmethods.TheMSmayusetheBA_RANGEinformationelement,which,iftransmittedinthechannelreleasemessage(seeGSM04.08),indicatesrangesofcarrierswhichincludetheBCCHcarriersinuseoverawideareaoreventhewholePLMN.ItshouldbenotedthattheBA(BCCH)listmightonlycontaincarriersinuseinthevicinityofthecellonwhichitwasbroadcast,andthereforemightnotbeappropriateiftheMSisswitchedoffandmovedtoanewlocation.TheBA_RANGEinformationelementcontainstheNumberofRangesparameter(definedasNR)aswellasNRsetsofparametersRANGEi_LOWERandRANGEi_HIGHER.TheMSshouldinterpretthesetomeanthatalltheBCCHcarriersofthenetworkhaveARFCNsinthefollowingranges:Range1=ARFCN(RANGE1_LOWER)toARFCN(RANGE1_HIGHER);Range2=ARFCN(RANGE2_LOWER)toARFCN(RANGE2_HIGHER);RangeNR=ARFCN(RANGENR_LOWER)toARFCN(RANGENR_HIGHER).IfRANGEi_LOWERisgreaterthanRANGEi_HIGHER,therangeshallbeconsideredcyclicandencompassescarrierswithARFCNfromrangeRANGEi_LOWERto1023andfrom0toRANGEi_HIGHER.IfRANGEi_LOWERequalsRANGEi_HIGHERthentherangeshallonlyconsistofthecarrierwhoseARFCNisRANGEi_LOWER.IfanMSincludesastoredBCCHcarrierlistoftheselectedPLMNitshallperformthesamemeasurementsasinsubclause6.2exceptthatonlytheBCCHcarriersinthelistneedtobemeasured.Ifstoredlistcellselectionisnotsuccessful,thenasdefinedinGSM03.22,normalcellselectionshalltakeplace.SinceinformationconcerninganumberofchannelsisalreadyknowntotheMS,itmayassignhighprioritytomeasurementsonthestrongestcarriersfromwhichithasnotpreviouslymadeattemptstoobtainBCCHinformation,andomitrepeatedmeasurementsontheknownones.6.4CriteriaforcellselectionandreselectionThepathlosscriterionparameterC1usedforcellselectionandreselectionisdefinedby:C1=(A-Max(B,0))whereA=RLA_C-RXLEV_ACCESS_MINB=MS_TXPWR_MAX_CCH-Pexceptfortheclass3DCS1800MSwhere:B=MS_TXPWR_MAX_CCH+POWEROFFSET-PRXLEV_ACCESS_MIN=MinimumreceivedsignallevelattheMSrequiredforaccesstothesystem.MS_TXPWR_MAX_CCH=MaximumTXpowerlevelanMSmayusewhenaccessingthesystemuntilotherwisecommanded.POWEROFFSET=ThepoweroffsettobeusedinconjunctionwiththeMSTXPWRMAXCCHparameterbytheclass3DCS1800MS.P=MaximumRFoutputpoweroftheMS.AllvaluesareexpressedindBm.Thepathlosscriterion(GSM03.22)issatisfiedifC1>0.SIST EN 300 911 V6.8.1:2003

ETSIETSIEN300911V6.8.1(2000-10)15(GSM05.08version6.8.1Release1997)ThereselectioncriterionC2isusedforcellreselectiononlyandisdefinedby:C2=C1+CELL_RESELECT_OFFSET-TEMPORARYOFFSET*H(PENALTY_TIME-T)forPENALTY_TIME<>11111C2=C1-CELL_RESELECT_OFFSETforPENALTY_TIME=11111whereFornon-servingcells:H(x)=0forx<0=1forx≥≥≥≥0Forservingcells:H(x)=0Tisatimerimplementedforeachcellinthelistofstrongestcarriers(seesubclause6.6.1).TshallbestartedfromzeroatthetimethecellisplacedbytheMSonthelistofstrongestcarriers,exceptwhenthepreviousservingcellisplacedonthelistofstrongestcarriersatcellreselection.Inthis,case,TshallbesettothevalueofPENALTY_TIME(i.e.expired).CELL_RESELECT_OFFSETappliesanoffsettotheC2reselectioncriterionforthatcell.NOTE:CELL_RESELECT_OFFSETmaybeusedtogivedifferentprioritiestodifferentbandswhenmultibandoperationisused.TEMPORARY_OFFSETappliesane
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