SIST EN 300 912 V6.5.1:2003

Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem synchronization (GSM 05.10 version 6.5.1 Release 1997)

SUBJECT Clarification of packet polling procedure for calculating new TA

Digitalni celični telekomunikacijski sistem (faza 2+) – Sinhronizacija radijskega podsistema (GSM 05.10, različica 6.5.1, izdaja 1997)

General Information

• 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 300 912 V6.5.1 (1999-12) - Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem synchronization (GSM 05.10 version 6.5.1 Release 1997)

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 synchronization (GSM 05.10 version 6.5.1 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 6.5.1SIST EN 300 912 V6.5.1:2003en01-december-2003SIST EN 300 912 V6.5.1:2003SLOVENSKI
STANDARD



SIST EN 300 912 V6.5.1:2003



ETSIEN300912V6.5.1(1999-12)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemsynchronization(GSM05.10version6.5.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)2(GSM05.10version6.5.1Release1997)ReferenceREN/SMG-020510Q6R3KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshouldbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute1999.Allrightsreserved.SIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)3(GSM05.10version6.5.1Release1997)ContentsIntellectualPropertyRights.5Foreword.51Scope.61.2References.61.3Definitionsandabbreviations.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.136.11.3Contentionresolutionreactiontime.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.15SIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)4(GSM05.10version6.5.1Release1997)A.2.1.2Thereceptionepochcriterion.15A.2.1.3Pseudo-synchronizedhandover.15A.2.2Thesynchronizationrequirement.15A.3MSrequirements.15A.3.1Provisionoftimedifferenceinformation.16A.3.2Aftereachsuccessfulhandover.16A.3.3Synchronizedorapseudosynchronizedhandover.16AnnexB(informative):ChangeRequestHistory.17History.18SIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)5(GSM05.10version6.5.1Release1997)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbytheSpecialMobileGroup(SMG).ThepresentdocumentdefinestherequirementsforsynchronizationontheGSMradiosub-systemofthedigitalmobilecellularandpersonalcommunicationsystemsoperatinginthe900MHzand1800MHzband(GSM900andDCS1800).ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenberepublishedbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version6.x.ywhere:6indicatesrelease1997ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:3December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)6(GSM05.10version6.5.1Release1997)1ScopeThepresentdocumentdefinestherequirementsforsynchronizationontheGSMradiosub-system.(However,itdoesnotdefinethesynchronizationalgorithmstobeusedintheBaseTransceiverStation(BTS)andMobileStation(MS).Theseareuptothemanufacturertospecify.)1.2ReferencesThefollowingdocumentscontainprovisionswhich,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".1.3DefinitionsandabbreviationsInadditiontothosebelow,abbreviationsusedinthepresentdocumentarelistedinGSM01.04.BTS:BaseTransceiverStationTimingAdvance:AsignalsentbytheBTStotheMSwhichtheMSusestoadvanceitstimingsoftransmissionstotheBTSsoastocompensateforpropagationdelayQuarterbitnumber:Thetimingofquarterbitperiods(12/13µs)withinatimeslotSIST EN 300 912 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)7(GSM05.10version6.5.1Release1997)Timeslotnumber:ThetimingoftimeslotswithinaTDMAframeTDMAframenumber:ThecountofTDMAframesrelativetoanarbitrarystartpointCurrentServingBTS:TheBTSononeofwhosechannels(TCH,DCCH,CCCHorPDCH)theMSiscurrentlyoperatingTimebasecounters:AsetofcounterswhichdeterminethetimingstateofsignalstransmittedbyaBTSorMSMStimingoffset:ThedelayofthereceivedsignalrelativetotheexpectedsignalfromanMSatzerodistanceunderstaticchannelconditionswithzerotimingadvance.Thisisaccurateto±1bit,andreportedonceperSACCHorafteraRACHas.required(i.e.atthesamerateastimingadvance).Forexample,foranMSwitharoundtrippropagationdelayofPbits,butwithatimingadvanceofTbits,thereportedtimingoffsetwillbeP-Tquantizedtothenearestbit.ForGPRStheMStimingoffsetisnotreported.TimingAdvanceIndex:TheTimingAdvanceIndexTAIusedforGPRS,whichdeterminesthepositionofthesubchannelonPTCCH(seeGSM05.02)usedbytheMStosendanaccessburst,fromwhichthenetworkcanderivethetimingadvance.2GeneraldescriptionofsynchronizationsystemThisclausegivesageneraldescriptionofthesynchronizationsystem.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 V6.5.1:2003



ETSIETSIEN300912V6.5.1(1999-12)8(GSM05.10version6.5.1Release1997)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,thetimebasecountersareincrementedasinsubclause3.2.(WhenadjacentBTS'sarebeingmonitoredforhandoverpurposes,orforcellreselectionpurposesingroupreceivemode,theMSmaychoosetostorethevaluesofQN,TNandFNforalltheBTS'swhosesynchronizationburstshavebeendetectedrelativetoQN,TNandFNforitscurrentservingBTS).5BTSRequirementsforSynchronizationTheconditionsunderwhichtherequirementsofsubclauses5.4and5.6mustbemetshallbe3dBbelowthereferencesensitivitylevelinGSM05.05and3dBlesscarriertointerferenceratiothanthereferenceinterferenceratiosinGSM05.05.5.1FrequencysourceTheBTSshalluseasinglefrequencysourceofabsoluteaccuracybetterthan0.05ppmforbothRFfrequencygenerationandclockingthetimebase.ThesamesourceshallbeusedforallcarriersoftheBTS.5.2TimebasecountersItisoptionalwhetherthetimebasecountersofdifferentBTS'saresynchronizedtogether.5.3InternalBTScarriertimingThechannelsofdifferentcarrierstransmittedbyaBTSshallbesynchronizedtogether,i.e.controlledbythesamesetofcounters.Thetimingdifferencebetweenthedifferentcarriersshallbelessthan1/4bitperiods,measuredattheBTSantenna.SIST EN 300 912 V6.5.1:2003



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