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SIST EN 300 937 V7.0.1:2003

(Main)

Digital cellular telecommunications system (Phase 2+) (GSM); Data Link (DL) layer; General aspects (GSM 04.05 version 7.0.1 Release 1998)

Digital cellular telecommunications system (Phase 2+) (GSM); Data Link (DL) layer; General aspects (GSM 04.05 version 7.0.1 Release 1998)

Upgrade from Phase 2+ to Release 1998

Digitalni celični telekomunikacijski sistem (faza 2+) – Podatkovna povezovalna plast (DL) – Splošni vidiki (GSM 04.05, različica 7.0.1, izdaja 1998)

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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 300 937 V7.0.1 (2000-01) - Digital cellular telecommunications system (Phase 2+) (GSM); Data Link (DL) layer; General aspects (GSM 04.05 version 7.0.1 Release 1998)

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EN 300 937 V7.0.1:2003
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Data Link (DL) layer; General aspects (GSM 04.05 version 7.0.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 937 Version 7.0.1SIST EN 300 937 V7.0.1:2003en01-december-2003SIST EN 300 937 V7.0.1:2003SLOVENSKI
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SIST EN 300 937 V7.0.1:2003



ETSIEN300937V7.0.1(2000-01)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);DataLink(DL)layer;Generalaspects(GSM04.05version7.0.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)2(GSM04.05version7.0.1Release1998)ReferenceREN/SMG-030405Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)3(GSM04.05version7.0.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.51.1References.61.2Abbreviations.72Conceptsandterminology.73OverviewdescriptionofLAPDmfunctionsandprocedures.103.1General.103.2Unacknowledgedoperation.113.3Acknowledgedoperation.113.4Informationtransfermode.113.4.1InformationtransferontheBCCH.113.4.2InformationtransferonthePCH+AGCH.113.4.3InformationtransferontheDCCHs.113.5Releaseofdatalinks.114Servicecharacteristics.124.1General.124.2Servicesprovidedtolayer3.124.2.1General.124.2.2Priority.124.2.3Segmentation.124.2.4Unacknowledgedinformationtransferservice.134.2.5Acknowledgedinformationtransferservices.134.2.6Randomaccessprocedure.144.3Servicesrequiredfromthephysicallayer.144.4Administrativeservices.154.4.1Generaldescriptionofadministrativeservices.154.4.2Definitionofprimitivesforadministrativeservices.165Overviewofdatalinklayerstructure.165.1Functionalcomposition.165.2Identificationofdatalinkendpoints.165.3Datalinkprocedure.175.4Datalinkdistributionprocedure.175.5Randomaccessprocedures.176Specificrequirements.186.1ModeofoperationandallowedSAPIs.186.2Acknowledgedmodeofoperation.196.2.1Windowsize.196.2.2Processingcapacity.19History.20SIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)4(GSM04.05version7.0.1Release1998)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).Thepresentdocumentdefinesingeneraltermsthedatalinklayer(layer2)oftheMobileStation(MS)-networkinterfacewithinthedigitalcellulartelecommunicationssystem.TheETSfromwhichthepresentdocumenthasevolvedisPhase2GSMETS300554(GSM04.05version4.0.3).ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocument,itwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7 indicates Release 1998 of GSM Phase 2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.ThespecificationfromwhichthepresentdocumenthasbeenderivedwasoriginallybasedonCEPTdocumentation,hencethepresentationofthepresentdocumentmaynotbeentirelyinaccordancewiththeETSIdraftingrules.NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)5(GSM04.05version7.0.1Release1998)1ScopeThepresentdocumentdescribesingeneraltermstheLinkAccessProceduresontheDmchannel,LAPDm.Theapplicationofthisprotocoltootherchanneltypesisforfurtherstudy.DetailsareprovidedinGSM04.06.ThepurposeofLAPDmistoconveyinformationbetweenlayer3entitiesacrosstheGSMPLMNradiointerface(MStonetworkinterface)usingtheDmchannel.NOTE1:ThetermDmchannelisusedforconveniencetodesignatethecollectionofallthevarioussignallingchannelsrequiredintheGSMsystem.SeealsoGSM04.03.ThedefinitionofLAPDmisbasedontheprinciplesandterminologyof:-CCITTRecommendationsX.200andX.210:thereferencemodelforOpenSystemsInterconnection(OSI);-CCITTRecommendationsQ.920andQ.921:thespecificationofLAPDfortheuser-networkinterfaceinISDN;-CCITTRecommendationX.25LAPB:user-networkinterfaceforpacketmodeterminals;and-ISO3309andISO4335:High-levelDataLinkControl(HDLC)standardsforframestructureandelementsofprocedures.LAPDmisaprotocolthatoperatesatthedatalinklayeroftheOSIarchitecture.Therelationshipbetweenthedatalinklayerandotherprotocollayersisdefinedbelow.NOTE2:Theinterfacebetweenthemobilestationandexternalterminalequipment/terminaladaptersisdefinedintheTechnicalSpecificationsoftheGSM07-series.NOTE3:ThephysicallayerontheradiointerfaceisdefinedinGSM04.04andlayer3isdefinedinGSM04.07,04.08,04.10and04.11.ReferenceshouldbemadetotheseTechnicalSpecificationsforthecompletedefinitionsoftheprotocolsandproceduresacrosstheGSMPLMNradiointerface.NOTE4:Theterm"datalinklayer"isusedinthemaintextofthepresentdocument.However,mainlyinfiguresandtables,theterms"layer2"and"L2"areusedabbreviations.Furthermore,inaccordancewithGSM04.07and04.08theterm"layer3"isusedtoindicatethelayerabovethedatalinklayer.LAPDmisindependentofthetransmissionbitrate.ItrequiresphysicalchannelswithcharacteristicsasdefinedinGSM04.03.Section2belowdescribesbasicconceptsusedinthepresentdocumentandGSM04.06.Section3givesanoverviewdescriptionofLAPDmfunctionsandprocedures.Section4summarizestheservicesthatthedatalinklayerprovidestolayer3andtheservicesthatthedatalinklayerrequiresfromthephysicallayer.Section5providesanoverviewofthedatalinklayerstructure.SIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)6(GSM04.05version7.0.1Release1998)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]GSM04.01:"Digitalcellulartelecommunicationssystem;MobileStation-BaseStationSystem(MS-BSS)interfaceGeneralaspectsandprinciples".[3]GSM04.03:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interfaceChannelstructuresandaccesscapabilities".[4]GSM04.04:"Digitalcellulartelecommunicationssystem;Layer1Generalrequirements".[5]GSM04.06:"Digitalcellulartelecommunicationssystem;MobileStation-BaseStationSystem(MS-BSS)interfaceDataLink(DL)layerspecification".[6]GSM04.07:"Digitalcellulartelecommunicationssystem(Phase2);Mobileradiointerfacesignallinglayer3Generalaspects".[7]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[8]GSM04.10:"Digitalcellulartelecommunicationssystem;Mobileradiointerfacelayer3SupplementaryservicesspecificationGeneralaspects".[9]GSM04.11:"Digitalcellulartelecommunicationssystem(Phase2+);Point-to-Point(PP)ShortMessageService(SMS)supportonmobileradiointerface".[10]GSM07.01:"Digitalcellulartelecommunicationssystem(Phase2+);GeneralonTerminalAdaptationFunctions(TAF)forMobileStations(MS)".[11]GSM07.02:"Digitalcellulartelecommunicationssystem(Phase2+);TerminalAdaptationFunctions(TAF)forservicesusingasynchronousbearercapabilities".[12]GSM07.03:"Digitalcellulartelecommunicationssystem(Phase2+);TerminalAdaptationFunctions(TAF)forservicesusingsynchronousbearercapabilities".[13]GSM07.05:"Digitalcellulartelecommunicationssystem(Phase2+);UseofDataTerminalEquipment-DataCircuitterminatingEquipment(DTE-DCE)interfaceforShortMessageService(SMS)andCellBroadcastService(CBS)".[14]GSM07.06:"Digitalcellulartelecommunicationssystem(Phase2);UseoftheVseriesDataTerminalEquipment-DataCircuitterminatingEquipment(DTE-DCE)interfaceattheMobileStation(MS)forMobileTermination(MT)configuration".[15]CCITTRecommendationX.25:"Interfacebetweendataterminalequipment(DTE)anddatacircuit-terminatingequipment(DCE)forterminalsoperatinginthepacketmodeandconnectedtopublicdatanetworksbydedicatedcircuit".SIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)7(GSM04.05version7.0.1Release1998)[16]CCITTRecommendationX.200:"ReferenceModelofOpenSystemsInterconnectionforCCITTApplications".[17]CCITTRecommendationX.210:"OpenSystemsInterconnectionlayerservicedefinitionconventions".[18]CCITTRecommendationQ.920:"Integratedservicesdigitalnetwork(ISDN)user-networkinterface-DatalinklayerGeneralaspects".[19]CCITTRecommendationQ.921:"Integratedservicesdigitalnetwork(ISDN)user-networkinterface-Datalinklayerspecification".[20]ISO3309:"Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-Highleveldatalinkcontrol(HDLC)procedures-Framestructure".[21]ISO/IEC4335:"Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-Highleveldatalinkcontrol(HDLC)procedures-Elementsofprocedures".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.2ConceptsandterminologyThegenerallayeringprinciplesusedinthepresentdocumentandotherspecificationsinthe04seriesaregiveninGSM04.01.ThedatalinklayeristhenexttolowestlayeroftheOSIreferencemodel.Thedatalinklayerreceivesservicesfromthephysicallayerandprovidesservicestolayer3.Theservicesprovidedbythedatalinklayerarethecombinationoftheservicesandfunctionsprovidedbyboththedatalinklayerandthephysicallayer.AdatalinklayerServiceAccessPoint(SAP)isthepointatwhichthedatalinklayerprovidesservicestolayer3.TheServiceAccessPointisidentifiedbyaServiceAccessPointIdentifier(SAPI).OneormoredatalinkconnectionendpointscanbeassociatedwitheachdatalinklayerSAP.Seefigure1.Adatalinkconnectionendpointisidentifiedbyadatalinkconnectionendpointidentifier(asseenfromlayer3)andbyaDataLinkConnectionIdentifierDLCI(asseenfromthedatalinklayer).SAPIsandDLCIsusedbyLAPDmaredefinedinsection5.2.Layer3Layer3entityDatalinklayerserviceaccesspointDatalinkconnectionendpointDatalinklayerDatalinklayerentity*Figure1:Entities,serviceaccesspointsandendpointsSIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)8(GSM04.05version7.0.1Release1998)Co-operationbetweendatalinklayerentitiesisgovernedbyapeer-to-peerprotocolspecifictothelayer.Forinformationexchangebetweentwoormorelayer3entities,anassociationmustbeestablishedbetweenthelayer3entitiesinthedatalinklayerusingadatalinklayerprotocol.Thisassociationiscalledadatalinkconnection.DatalinkconnectionsareprovidedbythedatalinklayerbetweentwoormoreSAPs(seefigure2).Layer3entityLayer3entityDatalinklayerserviceaccesspointDatalinkconnectionendpointDatalinkrelationshipFigure2:Peer-to-peerrelationshipDatalinklayermessageunitsareconveyedbetweendatalinklayerentitiesbymeansofphysicalconnection.Layer3requestsservicesfromthedatalinklayerviaserviceprimitives.Thesameappliesfortheinteractionbetweenthedatalinklayerandthephysicallayer.Theprimitivesrepresent,inanabstractway,thelogicalexchangeofinformationandcontrolbetweenthedatalinklayeranditsadjacentlayers.Theydonotspecifyorconstrainimplementations.Theprimitivesthatareexchangedbetweenthedatalinklayerandadjacentlayersareofthefollowingfourtypes(seealsofigure3).**Layer3ConfirmIndicationSAPDatalinklayerLayer2peer-to-peerprotocolRequestResponseNOTE:Thesameprincipleappliesfordatalinklayer-physicallayerinteractions.Figure3:PrimitiveactionsequenceSIST EN 300 937 V7.0.1:2003



ETSIETSIEN300937V7.0.1(2000-01)9(GSM04.05version7.0.1Release1998)TheREQUESTprimitivetypeisusedwhenahigherlayerisrequestingaservicefromthenextlowerlayer.TheINDICATIONprimitivetypeisusedbyalayerprovidingaservicetonotifythenexthigherlayerofactivitiesrelatedtotheprimitivetypeREQUEST.TheRESPONSEprimitivetypeisusedbyalayertoacknowledgereceipt,fromalowerlayer,oftheprimitivetypeINDICATION.TheCONFIRMprimitivetypeisusedbythelayerprovidingtherequestedservicetoconfirmthattheactivityhasbeencompleted.TheprecisespecificationofLayer-to-layerinteractionsisgiveninGSM04.06.InformationbetweenpeerentitiesandbetweenentitiesinadjacentlayersattachedtothesameSAPistransferredintwodifferenttypesofmessageunits:-messageunitsofapeer-to-peerprotocol;and-messageunitsthatcontainlayer-to-layerinformationconcerningstatusandspecializedservicerequests.Themessageunitsofthelayer3peer-to-peerprotocolarecarriedbythedatalinkconnection.Themessageunitscontaininglayer-to-layerinformationconcerningstatusandspecializedservicerequestsareneverconveyedoveradatalinkconnectionoraphysicalconnection.Thepresentdocumentintroduces(seealsofigure4):a)thepeer-to-peerprotocolforthetransferofinformationandcontrolbetweenanypairofdatalinklayerserviceaccesspoints;b)theinteractionsbetweenthedatalinklayerandlayer3,andbetweenthedatalinklayerandthephysicallayer.Layer3entityLayer3entityDa
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