ETSI EN 300 912 V6.6.1 (2001-05)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+); Radio subsystem synchronization (GSM 05.10 version 6.6.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 912 Version 6.6.1SIST EN 300 912 V6.6.1:2003en01-december-2003SIST EN 300 912 V6.6.1:2003SLOVENSKI
STANDARD



SIST EN 300 912 V6.6.1:2003



ETSIEN300912V6.6.1(2001-05)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization(GSM05.10version6.6.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)2(GSM05.10version6.6.1Release1997)ReferenceREN/SMG-020510Q6R4KeywordsDigitalcellulartelecommunicationssystem,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.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)3(GSM05.10version6.6.1Release1997)ContentsIntellectualPropertyRights.5Foreword.51Scope.61.1References.61.2Definitionsandabbreviations.62Generaldescriptionofsynchronizationsystem.73Timebasecounters.73.1Timingstateofthesignals.73.2Relationshipbetweencounters.84Timingoftransmittedsignals.85BTSRequirementsforSynchronization.85.1Frequencysource.85.2Timebasecounters.85.3InternalBTScarriertiming.85.4InitialTimingadvanceestimation.95.5Maximumtimingadvancevalue.95.6Delaytracking.95.6.1Forcircuitswitchedchannels.95.6.2Forpacketswitchedchannels.95.6.3Delayassessmenterror.95.7Timeslotlength.95.8RangeofTimingadvance.96MSRequirementsforSynchronization.106.1MScarrierfrequency.106.2Internaltimebase.106.3AssessmentofBTStiming.106.4Timingoftransmission.106.5ApplicationofTimingAdvance.106.5.1Forcircuitswitchedchannels.106.5.2Forpacketswitchedchannels.116.6AccesstoanewBTS.116.7Temporarylossofsignal.126.8Timingofintracellchannelchange.126.9ApplicationofnewTimingAdvancevalue.126.10Definitionof"readytotransmitwithinxms".126.11DefinitionofadditionalreactiontimesforGPRSmobilestations.126.11.1Uplinkanddownlinkassignmentreactiontimes.126.11.2Changeinchannelcodingschemecommandedbynetwork.126.11.3Contentionresolutionreactiontime.136.11.4Reactiontimeinresponsetoothercommandingmessages.13AnnexA(normative):Additionalrequirementsforpseudo-synchronization,synchronizedhandoversandpseudo-synchronizedhandovers.14A.1Generaldescriptionsanddefinitions.14A.1.1Conventions.14A.1.2Definitions.14A.1.3Detailsofoperations.14A.2BTSrequirements.15A.2.1Thepseudo-synchronizationscheme.15A.2.1.1BTSatimedifferenceestimate.15A.2.1.2Thereceptionepochcriterion.15SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)4(GSM05.10version6.6.1Release1997)A.2.1.3Pseudo-synchronizedhandover.15A.2.2Thesynchronizationrequirement.15A.3MSrequirements.16A.3.1Provisionoftimedifferenceinformation.16A.3.2Aftereachsuccessfulhandover.16A.3.3Synchronizedorapseudosynchronizedhandover.16AnnexB(informative):ChangeRequestHistory.17History.18SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)5(GSM05.10version6.6.1Release1997)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).ThepresentdocumentdefinestherequirementsforsynchronizationontheGSMradiosub-systemofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenberepublishedbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version6.x.ywhere:6indicatesrelease1997ofGSMPhase2+xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:18May2001DateoflatestannouncementofthisEN(doa):31August2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2002DateofwithdrawalofanyconflictingNationalStandard(dow):28February2002SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)6(GSM05.10version6.6.1Release1997)1ScopeThepresentdocumentdefinestherequirementsforsynchronizationontheGSMradiosub-system.(However,itdoesnotdefinethesynchronizationalgorithmstobeusedintheBaseTransceiverStation(BTS)andMobileStation(MS).Theseareuptothemanufacturertospecify.)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]GSM03.60:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);ServiceDescriptionStage2".[3]GSM03.64:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);GPRSRadioInterfaceStage2".[4]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[5]GSM04.60:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralPacketRadioService(GPRS);MobileStation(MS)-BaseStationSystem(BSSinterface;RadioLinkControl(RLC)andMediumAccessControl(MAC)LayerSpecification".[6]GSM05.02:"Digitalcellulartelecommunicationssystem(Phase2+);Multiplexingandmultipleaccessontheradiopath".[7]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[8]GSM05.08:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol".[9]GSM03.30:"Digitalcellulartelecommunicationssystem(Phase2+);Radionetworkplanningaspects".1.2DefinitionsandabbreviationsInadditiontothosebelow,abbreviationsusedinthepresentdocumentarelistedinGSM01.04.Forthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BTS:BaseTransceiverStationTimingAdvance:signalsentbytheBTStotheMSwhichtheMSusestoadvanceitstimingsoftransmissionstotheBTSsoastocompensateforpropagationdelaySIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)7(GSM05.10version6.6.1Release1997)Quarterbitnumber:timingofquarterbitperiods(12/13µs)withinatimeslotTimeslotnumber:timingoftimeslotswithinaTDMAframeTDMAframenumber:countofTDMAframesrelativetoanarbitrarystartpointCurrentServingBTS:BTSononeofwhosechannels(TCH,DCCH,CCCHorPDCH)theMSiscurrentlyoperatingTimebasecounters:setofcounterswhichdeterminethetimingstateofsignalstransmittedbyaBTSorMSMStimingoffset:delayofthereceivedsignalrelativetotheexpectedsignalfromanMSatzerodistanceunderstaticchannelconditionswithzerotimingadvance.Thisisaccurateto±1bit,andreportedonceperSACCHorafteraRACHas.required(i.e.atthesamerateastimingadvance).Forexample,foranMSwitharoundtrippropagationdelayofPbits,butwithatimingadvanceofTbits,thereportedtimingoffsetwillbeP-Tquantizedtothenearestbit.ForGPRStheMStimingoffsetisnotreportedTimingAdvanceIndex:TimingAdvanceIndexTAIusedforGPRS,whichdeterminesthepositionofthesubchannelonPTCCH(seeGSM05.02)usedbytheMStosendanaccessburst,fromwhichthenetworkcanderivethetimingadvance2GeneraldescriptionofsynchronizationsystemThisclausegivesageneraldescriptionofthesynchronizationsystem.Detailedrequirementsaregiveninclauses3to6.TheBTSsendssignalsontheBCCHtoenabletheMStosynchronizeitselftotheBTSandifnecessarycorrectitsfrequencystandardtobeinlinewiththatoftheBTS.ThesignalssentbytheBTSforthesepurposesare:a)frequencycorrectionbursts;b)synchronizationbursts.Thetimingsoftimeslots,TDMAframes,TCHframesandcontrolchannelframesareallrelatedtoacommonsetofcounterswhichruncontinuouslywhethertheMSandBTSaretransmittingornot.Thus,oncetheMShasdeterminedthecorrectsettingofthesecounters,allitsprocessesaresynchronizedtothecurrentservingBTS.TheMStimesitstransmissionstotheBTSinlinewiththosereceivedfromtheBTS.TheBTSsendstoeachMSa"timingadvance"parameter(TA)accordingtotheperceivedroundtrippropagationdelayBTS-MS-BTS.TheMSadvancesitstimingbythisamount,withtheresultthatsignalsfromdifferentMS'sarrivingattheBTSandcompensatedforpropagationdelay.Thisprocessiscalled"adaptiveframealignment".Additionally,synchronizationfunctionsmaybeimplementedinboththeMSandtheBTStosupporttheso-calledpseudosynchronizationscheme.ThesupportofthisschemeisoptionalexceptthatMSshallmeasureandreporttheObservedTimingDifference(OTD),whichisamandatoryrequirement.Thedetailedspecificationsofthepseudo-synchronizationschemeareincludedinannexA.3Timebasecounters3.1TimingstateofthesignalsThetimingstateofthesignalstransmittedbyaBTSorMSisdefinedbythefollowingcounters:-QuarterbitnumberQN(0-624)-BitnumberBN(0-156);-TimeslotnumberTN(0-7);-TDMAframenumberFN(0to(26x51x2048)-1=2715647).SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)8(GSM05.10version6.6.1Release1997)3.2RelationshipbetweencountersTherelationshipbetweenthesecountersisasfollows:-QNincrementsevery12/13µs;-BN=IntegerpartofQN/4;-TNincrementswheneverQNchangesfromcount624to0;-FNincrementswheneverTNchangesfromcount7to0.4TimingoftransmittedsignalsThetimingofsignalstransmittedbytheMSandBTSaredefinedinGSM05.02.TheMScanusethetimingofreceiptofthesynchronizationbursttosetupitstimebasecountersasfollows:QNissetbythetimingofthetrainingsequence;TN=0whenthesynchburstisreceived;FN=51((T3-T2)mod(26))+T3+51x26xT1whenthesynchburstisreceived,(whereT3=(10xT3')+1,T1,T2andT3'beingcontainedininformationfieldsinsynchronizationburst).Thereafter,thetimebasecountersareincrementedasinclause3.2.(WhenadjacentBTS'sarebeingmonitoredforhandoverpurposes,orforcellreselectionpurposesingroupreceivemode,theMSmaychoosetostorethevaluesofQN,TNandFNforalltheBTS'swhosesynchronizationburstshavebeendetectedrelativetoQN,TNandFNforitscurrentservingBTS.)5BTSRequirementsforSynchronizationTheconditionsunderwhichtherequirementsofclauses5.4and5.6mustbemetshallbe3dBbelowthereferencesensitivitylevelinGSM05.05and3dBlesscarriertointerferenceratiothanthereferenceinterferenceratiosinGSM05.05.5.1FrequencysourceTheBTSshalluseasinglefrequencysourceofabsoluteaccuracybetterthan0,05ppmforbothRFfrequencygenerationandclockingthetimebase.ThesamesourceshallbeusedforallcarriersoftheBTS.5.2TimebasecountersItisoptionalwhetherthetimebasecountersofdifferentBTS'saresynchronizedtogether.5.3InternalBTScarriertimingThechannelsofdifferentcarrierstransmittedbyaBTSshallbesynchronizedtogether,i.e.controlledbythesamesetofcounters.Thetimingdifferencebetweenthedifferentcarriersshallbelessthan1/4bitperiods,measuredattheBTSantenna.SIST EN 300 912 V6.6.1:2003



ETSIETSIEN300912V6.6.1(2001-05)9(GSM05.10version6.6.1Release1997)5.4InitialTimingadvanceestimationWhentheBTSdetectsanaccessbursttransmissiononRACHorPRACH,itshallmeasurethedelayofthissignalrelativetotheexpectedsignalfromanMSatzerodistanceunderstaticchannelconditions.Thisdelay,calledthetimingadvance,shallberoundedtothenearestbitperi
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