ETSI EN 300 911 V7.4.1 (2000-10)

Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 7.4.1 Release 1998)

REN/SMG-020508Q7R2

Digitalni celični telekomunikacijski sistem (faza 2+) – Krmiljenje povezave radijskega podsistema (GSM 05.08, različica 7.4.1, izdaja 1998)

General Information

• Status: Published
• Publication Date: 16-Oct-2000
• Technical Committee: SMG 2 - Radio
• Current Stage: 12 - Completion
• Due Date: 06-Oct-2000
• Completion Date: 17-Oct-2000
• Ref Project: SIST EN 300 911 V7.4.1:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 7.4.1 Release 1998)

Standards Content (Sample)

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 7.4.1 Release 1998)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 7.4.1SIST EN 300 911 V7.4.1:2003en01-december-2003SIST EN 300 911 V7.4.1:2003SLOVENSKI
STANDARD
ETSIEN300911V7.4.1(2000-10)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol(GSM05.08version7.4.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)2(GSM05.08version7.4.1Release1998)ReferenceREN/SMG-020508Q7R2KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°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:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)3(GSM05.08version7.4.1Release1998)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.114.5BSSpowercontrolrange.114.6Strategy.114.7Timing.114.8Dedicatedchannelsusedforavoicegroupcallorvoicebroadcast.115Radiolinkfailure.125.1Criterion.125.2MSprocedure.125.3BSSprocedure.126Idlemodetasks.136.1Introduction.136.2Measurementsfornormalcellselection.136.3Measurementsforstoredlistcellselection.146.4Criteriaforcellselectionandreselection.146.5Downlinksignallingfailure.156.6MeasurementsforCellReselection.166.6.1MonitoringofreceivedsignallevelandBCCHdata.166.6.2Pathlosscriteriaandtimingsforcellre-selection.176.6.3CellreselectionalgorithmforSoLSA.186.7ReleaseofTCHandSDCCH.186.7.1Normalcase.186.7.2Callre-establishment.196.8Abnormalcasesandemergencycalls.197Networkpre-requisites.207.1BCCHcarriers.207.2IdentificationofsurroundingBSSforhandovermeasurements.208Radiolinkmeasurements.218.1Signallevel.218.1.1General.218.1.2Physicalparameter.218.1.3Statisticalparameters.228.1.4Rangeofparameter.238.2Signalquality.238.2.1General.238.2.2Physicalparameter.238.2.3Statisticalparameters.23SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)4(GSM05.08version7.4.1Release1998)8.2.4Rangeofparameter.238.3Aspectsofdiscontinuoustransmission(DTX).248.4Measurementreporting.258.4.1MeasurementreportingfortheMSonaTCH.258.4.2MeasurementreportingfortheMSonaSDCCH.268.4.3AdditionalcellreportingrequirementsformultibandMS.268.4.4CommonaspectsfortheMSonaTCHoraSDCCH.278.4.5MeasurementreportingfortheBSS.278.4.6Extendedmeasurementreporting.288.5AbsoluteMS-BTSdistance.288.5.1General.288.5.2Physicalparameter.289Controlparameters.2910GPRSmodetasks.3110.1CellRe-selection.3110.1.1MonitoringthereceivedsignallevelandPBCCHdata.3110.1.1.1Packetidlemode.3110.1.1.2Packettransfermode.3210.1.2CellRe-selectionCriteria.3310.1.3CellRe-selectionAlgorithm.3410.1.3.1Abnormalcellreselection.3510.1.4NetworkcontrolledCellre-selection.3510.1.4.1Measurementreporting.3610.1.4.2Cellre-selectioncommand.3610.1.4.3Exceptionalcases.3710.1.5ExtendedMeasurementreporting.3710.2RFPowerControl.3810.2.1MSoutputpower.3810.2.2BTSoutputpower.3910.2.3MeasurementsatMSside.4010.2.3.1DerivingtheCvalue.4110.2.3.1.1Packetidlemode.4110.2.3.1.2Packettransfermode.4110.2.3.2DerivationofChannelQualityReport.4210.2.3.2.1Packettransfermode.4310.2.3.2.2Packetidlemode.4410.2.3.2.3Measurementreporting.4510.2.4MeasurementsatBSSside.4510.3Measurementrequirements.4510.4Controlparameters.4611CTSmodetasks.4811.1CTSidlemodetasks.4811.1.1CTScellselection.4811.1.1.1SynchronizationandmeasurementsforCTScellselection.4811.1.1.2InitialsychronizationofCTS-MS.4811.1.2CriterionforCTScellselection.4911.1.3MonitoringofCTSBCHandCTSPCH.4911.1.3.1Monitoringofreceivedsignallevel.4911.1.3.2Downlinkbeaconfailure.4911.1.3.3Downlinkpagingfailure.4911.1.4ProcedureswithreportingtotheCTS-FP.5011.1.4.1AFAmonitoring.5011.1.4.2BCCHdetection.5011.1.4.3ObservedFrequencyOffset(OFO)measurement.5011.2Intra-cellhandover.5111.2.1Overallprocess.5111.2.2CTS-MSmeasurementprocedure.5111.2.3CTS-FPmeasurementprocedure.5111.2.4Strategy.5111.3RFpowercontrol.51SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)5(GSM05.08version7.4.1Release1998)11.3.1Overallprocess.5111.3.2CTS-MSimplementation.5111.3.3CTS-MSpowercontrolrange.5211.3.4CTS-FPimplementation.5211.3.5CTS-FPpowercontrolrange.5211.3.6Strategy.5211.3.7Timing.5211.4Radiolinkfailure.5311.4.1Criterion.5311.4.2CTS-MSprocedure.5311.4.3CTS-FPprocedure.5311.5Radiolinkmeasurements.5311.5.1Signalstrength.5311.5.1.1General.5311.5.1.2Physicalparameter.5411.5.1.3Statisticalparameters.5411.5.1.4Rangeofparameter.5411.5.2Signalquality.5411.5.2.1General.5411.5.2.2Physicalparameter.5411.5.2.3Statisticalparameters.5411.5.2.4Rangeofparameter.5411.5.3Aspectsofdiscontinuoustransmission(DTX).5411.5.4MeasurementreportingfortheCTS-MSonaTCH.5411.6ControlofCTS-FPservicerange.5511.7Controlparameters.55AnnexA(informative):DefinitionofabasicGSMorDCS1800handoverandRFpowercontrolalgorithm.57A.1Scope.57A.2Functionalrequirement.57A.3BSSpre-processingandthresholdcomparisons.58A.3.1Measurementaveragingprocess.58A.3.2Thresholdcomparisonprocess.59A.3.2.1RFpowercontrolprocess.59A.3.2.2HandoverProcess.60A.4BSSdecisionalgorithm.61A.4.1Internalintracellhandoveraccordingtoradiocriteria:(Interferenceproblems).62A.4.2Internalhandoveraccordingtoothercriteria.62A.4.3Generalconsiderations.62A.5Channelallocation.62A.6HandoverdecisionalgorithmintheMSC.63AnnexB(informative):PowerControlProcedures.65B.1Openloopcontrol.65B.2Closedloopcontrol.66B.3Qualitybasedcontrol.66B.4BTSpowercontrol.67B.5Example.67AnnexC(informative):Changecontrolhistory.69History.71SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)6(GSM05.08version7.4.1Release1998)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:Version7.x.ywhere:7GSMPhase2+Release1998xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthepresentdocument:29September2000Dateoflatestannouncementofthepresentdocument(doa):31December2000DateoflatestpublicationofnewNationalStandardorendorsementofthepresentdocument(dop/e):30June2001DateofwithdrawalofanyconflictingNationalStandard(dow):30June2001SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)7(GSM05.08version7.4.1Release1998)1ScopeThepresentdocumentspecifiestheRadiosub-systemlinkcontrolimplementedintheMobileStation(MS),BaseStationSystem(BSS)andMobileSwitchingCentre(MSC)oftheGSM,DCS1800andPCS1900systems.Unlessotherwisespecified,referencestoGSMalsoincludeDCS1800.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.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 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)8(GSM05.08version7.4.1Release1998)[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".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2GeneralTheradiosub-systemlinkcontrolaspectsthatareaddressedareasfollows:-Handover;-RFPowercontrol;-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.AdaptivecontroloftheRFtransmitpowerfromanMSandoptionallyfromtheBSSisimplementedinordertooptimizetheuplinkanddownlinkperformanceandminimizetheeffectsofco-channelinterferenceinthesystem.Thecriteriafordeterminingradiolinkfailurearespecifiedinordertoensurethatcallswhichfaileitherfromlossofradiocoverageorunacceptableinterferencearesatisfactorilyhandledbythenetwork.Radiolinkfailuremayresultineitherre-establishmentorreleaseofthecallinprogress.Forchannelsusedforavoicegroupcall,anradiouplinkfailureresultsinthefreeingupoftheuplink.Proceduresforcellselectionandre-selectionwhilstinIdlemode(i.e.notactivelyprocessingacall),arespecifiedinordertoensurethatamobileiscampedonacellwithwhichitcanreliablycommunicateonboththeradiouplinkanddownlink.TheoperationsofanMSinIdleModearespecifiedinGSM03.22.SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)9(GSM05.08version7.4.1Release1998)Cellre-selectionisalsoperformedbytheMSwhenattachedtoGPRS,exceptwhentheMSsimultaneouslyhasacircuitswitchedconnection.Optionalproceduresarealsospecifiedfornetworkcontrolledcellre-selectionforGPRS.Cellre-selectionforGPRSisdefinedinsubclause10.1.AnMSlisteningtoavoicegroupcalloravoicebroadcastusecellre-selectionprocedurestochangecell.Thismaybesupportedbyalistofcellscarryingthevoicegrouporvoicebroadcastcalldownlink,providedtotheMSbythenetwork.TheoperationsofanMSinGroupReceiveModearespecifiedinGSM03.22.InformationsignalledbetweentheMSandBSSissummarizedintables1,2and3.AfullspecificationoftheLayer1headerisgiveninGSM04.04,andoftheLayer3fieldsinGSM04.08.ForCTS,informationsignalledbetweentheCTS-MSandCTS-FPissummarizedintables4,5and6.AfullspecificationoftheCTSLayer3fieldsisgiveninGSM04.56.3Handover3.1OverallprocessTheoverallhandoverprocessisimplementedintheMS,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.SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)10(GSM05.08version7.4.1Release1998)Inter-cellhandoverbetweencellsusingdifferentfrequencybandsisallowedforamultibandMS.Intra-cellhandover:Intra-cellhandoverfromonechannel/timeslotintheservingcelltoanotherchannel/timeslotinthesamecellwillnormallybeperformedifthehandovermeasurementsshowalowRXQUAL,butahighRXLEVontheservingcell.ThisindicatesadegradationofqualitycausedbyinterferenceeventhoughtheMSissituatedwithintheservingcell.Theintra-cellhandovershouldprovideachannelwithalowerlevelofinterference.Intra-cellhandovercanoccureithertoatimeslotonanewcarrierortoadifferenttimeslotonthesamecarrier.Similarly,intra-cellhandovermayoccurbetweendifferentmultislotconfigurationsinthesamecell.Thesemultislotconfigurationsmaycomprisedifferentnumberoftimeslotsandmaypartlyoverlap.Intra-cellhandoverfromoneofthebandsofoperationtoanotheroneisallowedforamultibandMS.GSM08.08definesthecausesforhandoverthatmaybesignalledfromBSStoMSC.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.SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)11(GSM05.08version7.4.1Release1998)4.4BSSimplementationRFpowercontrolmayoptionallybeimplementedintheBSS.4.5BSSpowercontrolrangeTherangeoverwhichtheBSSshallbecapableofreducingitsRFoutputpowerfromitsmaximumlevelshallbenominally30dB,in15stepsofnominally2dB.GSM05.05givesadetaileddefinitionoftheRFpowerlevelstepsizeandtolerances.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.SIST EN 300 911 V7.4.1:2003

ETSIETSIEN300911V7.4.1(2000-10)12(GSM05.08version7.4.1Release1998)5Radiolinkfailure5.1CriterionThecriterionfordeterminingRadioLinkFailureintheMSshallbebasedonthesuccessrateofdecodingmessagesonthedownlinkSACCH.Foracircuitswitchedmultislotconfiguration,onlythemainSACCHshallbeusedfordeterminingRadioLinkFailure.ForGPRS,RadioLinkFailureisdeterminedbytheRLC/MACprotocol(seeGSM04.60).5.2MSprocedureTheaimofdeterminingradiolinkfailureintheMSistoensurethatcallswithunacceptablevoice/dataquality,whichcannotbeimprovedeitherbyRFpowercontrolorhandover,areeitherre-establishedorreleasedinadefinedmanner.Ingeneraltheparametersthatcontroltheforcedreleaseshouldbesetsuchthattheforcedreleasewillnotnormallyoccuruntilthecallhasdegradedtoaqualitybelowthatatwhichthemajorityofsubscriberswouldhavemanuallyreleased.Thepresentdocumentsuresthat,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.AnMSlisteningtoavoicegroupcalloravoice
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