SIST EN 300 937 V7.0.1:2003

• Abstract:

  Upgrade from Phase 2+ to Release 1998

• 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)

Overview

SIST EN 300 937 V7.0.1:2003 is a Slovenian national standard based on the European Standard EN 300 937. Developed by the Slovenski inštitut za standardizacijo (SIST) and ETSI, this document defines the general aspects of the Data Link (DL) layer within the digital cellular telecommunications system, specifically for GSM (Phase 2+). It corresponds to GSM 04.05 version 7.0.1, aligning with Release 1998 and enabling an evolutionary upgrade from previous GSM Phase 2+ implementations.

This standard plays a crucial role in the architecture of the Global System for Mobile Communications (GSM), detailing how information is exchanged at the data link layer over the mobile station (MS) to network interface. The document covers general principles, functionalities, and service characteristics of the Link Access Procedures on the Dm channel (LAPDm), providing a foundation for reliable telecommunications services in GSM networks.

Key Topics

• Data Link Layer Fundamentals: Definition and general principles of the DL layer in the GSM network, including the service access points (SAPIs) and their identifiers.
• LAPDm Protocol: Procedures for establishing, maintaining, and releasing data links, with support for multiple frame acknowledged and unacknowledged operations.
• Channel Support: Description of data link operations across various GSM control channels, such as Broadcast Control Channel (BCCH), Paging Channel (PCH), Access Grant Channel (AGCH), Dedicated Control Channel (DCCH), and their unique requirements.
• Service Characteristics:
  • Unacknowledged and acknowledged information transfer services
  • Priority management among data links and message units
  • Segmentation and reassembly of messages for reliable delivery
  • Administrative services including error reporting and abnormal releases
• Inter-layer Interactions: Definition of service primitives and interactions between the data link, physical, and layer 3 protocols for seamless communication.
• Random Access Procedures: Guidelines for initial access, including mechanisms for sending and receiving random access bursts.

Applications

Implementation of SIST EN 300 937 V7.0.1:2003 is fundamental for:

• Mobile Network Infrastructure: Ensures interoperable, reliable data transportation between mobile stations and network entities across the GSM radio interface.
• Device Manufacturers: Guides suppliers of GSM modules and mobile devices in designing and testing products that correctly implement the data link layer according to international standards.
• Telecommunications Operators: Supports network upgrades by providing detailed requirements for phase 2+ to Release 1998 migrations, maintaining seamless service during technology refresh cycles.
• Testing and Validation: Used as a reference for conformance testing of GSM components, particularly in protocol analyzers and test suites.

By defining robust data link layer procedures, the standard guarantees the integrity and efficiency of signaling and data exchange within GSM networks, contributing to consistent service quality and network reliability.

Related Standards

SIST EN 300 937 V7.0.1:2003 references and complements several other GSM and telecommunications standards, including:

• GSM 04.01: General aspects and layering of the MS-BSS interface
• GSM 04.03: Channel structures and access capabilities
• GSM 04.04: Physical layer requirements
• GSM 04.06: DL layer specification (detailed LAPDm protocol)
• GSM 04.07/04.08/04.10/04.11: Higher layer protocols and supplementary services
• CCITT Recommendations (X.200, X.210) on OSI reference model and layer services
• ISO/IEC 3309, 4335: High-level Data Link Control (HDLC) procedures and frame structure

These related standards collectively establish a harmonized set of requirements and definitions for the GSM digital cellular telecommunications system, enabling global interoperability and facilitating advancements in mobile communication technology.

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
STANDARD
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.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.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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