SIST EN 300 911 V6.8.1:2003

• Abstract:

  05.08; s31b; CR: A250; R97; 6.7.1; 6.8.0; Correction to mapping of interference levels

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 911 V6.8.1 (2000-10) - Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 6.8.1 Release 1997)

Overview

SIST EN 300 911 V6.8.1:2003 is a European standard that specifies the radio subsystem link control for the digital cellular telecommunications system (GSM Phase 2+), covering both GSM 900 and DCS 1800 systems. The standard details how link control functionalities are implemented in the Mobile Station (MS), Base Station System (BSS), and Mobile Switching Centre (MSC). The focus is on critical areas such as handover, radio frequency (RF) power control, radio link failure, and cell selection/re-selection to ensure reliable mobile communication and network efficiency.

This standard aligns with EN 300 911 Version 6.8.1 and covers updates related to interference levels, supporting operators and manufacturers in ensuring network interoperability and consistent mobile service quality.

Key Topics

• Handover: Procedures for maintaining ongoing calls as a mobile station moves between cell coverage areas, including both intra-cell and inter-cell handover.
• RF Power Control: Mechanisms for adjusting transmit power of mobile devices and base stations to minimize interference and optimize radio link quality.
• Radio Link Failure: Criteria and processes for detecting radio link loss, ensuring calls are either re-established or released appropriately.
• Cell Selection and Reselection: Processes allowing mobile stations to choose optimal cells for communication during idle and active modes, enhancing connectivity performance.
• Measurement Reporting: Requirements for mobile and base station to measure and report signal levels and quality, enabling informed network control actions.
• Support for Voice Group and Broadcast Calls: Special considerations for control and allocation on channels used for group or broadcast voice services.
• Mode Adaptability: Provisions for cell selection and reselection in regular, group receive, and GPRS (packet-switched data) modes.

Applications

SIST EN 300 911 V6.8.1:2003 serves a crucial role in several telecommunications scenarios:

• Mobile Network Design & Optimization: Helps operators design and maintain GSM radio access networks, focusing on seamless user experience and efficient resource use through robust handover and power control strategies.
• Equipment Compliance: Guides manufacturers in developing mobile devices and infrastructure equipment (MS, BSS, MSC) to ensure compatibility with European GSM networks.
• Network Upgrades: Supports network modernization, such as introducing new frequency bands or optimizing interference mitigation, while maintaining service continuity.
• Quality of Service Management: Offers a framework for consistent performance through the detection and handling of radio link failures and dynamic network management.
• GPRS and Advanced GSM Services: Facilitates integration of packet-switched data capabilities (GPRS) alongside conventional circuit-switched communication.

Related Standards

Implementation of SIST EN 300 911 V6.8.1:2003 is intended for use alongside several key GSM standards and specifications, including but not limited to:

• GSM 03.09 - Handover procedures in Public Land Mobile Networks (PLMN)
• GSM 05.05 - Radio transmission and reception requirements
• GSM 05.10 - Radio subsystem synchronization
• GSM 04.08 - Mobile radio interface Layer 3 specification
• GSM 03.22 - Functions related to mobile station idle and group receive mode
• GSM 03.64 - Overall description of GPRS radio interface
• GSM 08.08 - MSC-BSS interface Layer 3 specification

For organizations and engineers working with GSM networks, adhering to this standard is essential for compliance, interoperability, and maintenance of a high-quality global system for mobile communication.

Keywords: GSM Radio subsystem, link control, RF power control, handover, radio link failure, cell selection, measurement reporting, GSM 900, DCS 1800, mobile network, GPRS, mobile telecommunications, radio access network.

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.:[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 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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