SIST EN 300 396-7 V1.2.1:2003

• Abstract:

  To define the technical requirements for a repeater type 2.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• 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
• Mandate: T-172
• Ref Project: ETSI EN 300 396-7 V1.2.1 (2000-12) - Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 7: Type 2 repeater air interface

Overview

SIST EN 300 396-7 V1.2.1:2003 specifies the technical requirements for Terrestrial Trunked Radio (TETRA) Direct Mode Operation (DMO), focusing on the air interface for type 2 repeaters. TETRA is a professional mobile radio and walkie-talkie standard, widely adopted for secure and reliable communications in critical environments such as public safety, emergency services, and transportation. This standard ensures interoperability, performance consistency, and security when using type 2 DMO repeaters, facilitating direct communication between mobile stations (MS) without reliance on network infrastructure.

Organizations deploying mission-critical radio systems benefit from adhering to these technical requirements, which support robust and secure communication even in the absence of a fixed network.

Key Topics

This standard covers essential aspects of TETRA DMO with type 2 repeaters, focusing on:

• Type 2 Repeater Air Interface: Technical details for the air interface between Direct Mode Mobile Stations (DM-MS) and type 2 Direct Mode Repeaters (DM-REP), supporting two simultaneous calls.
• Layered Protocol Specifications: Requirements for the physical, data link, and network layers according to the ISO model, ensuring reliable message transfer and synchronization.
• Call Handling Procedures: Definitions of call setup, changeover, pre-emption, and termination procedures for both individual and group calls through a type 2 repeater.
• Channel Management: Structures and procedures for DM channel arrangement, surveillance, channel state transitions, and dual watch operation for supporting parallel monitoring.
• Security Considerations: Procedures for air interface encryption and measures to safeguard communication integrity between devices.
• Random Access and Signalling: Rules for message transmission, including fragmentation, retransmission, and addressing mechanisms, ensuring efficient use of radio resources.

Applications

Implementing this standard is essential across various professional radio communication scenarios:

• Public Safety and Emergency Services: Enables police, fire, ambulance, and disaster response teams to maintain direct communication in remote or infrastructure-deficient areas.
• Utilities and Transportation: Supports operational efficiency by enabling field teams to communicate directly, increasing coverage through the use of repeaters.
• Event Management and Security: Ensures seamless and secure group communication in environments with fluctuating or temporary network infrastructure.
• Industrial and Critical Infrastructure: Supports maintenance and response teams in power plants, airports, and manufacturing facilities with dependable DMO repeater communication.

By following the SIST EN 300 396-7 V1.2.1:2003 guidelines, organizations ensure compatibility between TETRA devices from different manufacturers, improving system reliability and user safety.

Related Standards

For comprehensive TETRA DMO system design and operation, consider the following related standards:

• SIST EN 300 396-1: General network design for TETRA DMO
• SIST EN 300 396-2: Radio aspects of DMO operation
• SIST EN 300 396-3: MS-to-MS Air Interface protocol
• SIST EN 300 396-4: Type 1 repeater air interface
• SIST EN 300 396-5: Gateway air interface
• SIST EN 300 396-6: Security aspects in DMO
• EN 300 392-2: TETRA Voice plus Data (V+D) air interface

These standards collectively provide a robust foundation for the deployment, interoperability, and secure operation of TETRA radio systems in direct mode.

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Keywords: TETRA, Terrestrial Trunked Radio, Direct Mode Operation, Type 2 Repeater, DMO, DMO repeater, air interface, professional mobile radio, public safety radio, group call, secure radio communication

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.QDþLQTerrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 7: Type 2 repeater air interface33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:EN 300 396-7 Version 1.2.1SIST EN 300 396-7 V1.2.1:2003en01-december-2003SIST EN 300 396-7 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300396-7V1.2.1(2000-12)EuropeanStandard(Telecommunicationsseries)TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part7:Type2repeaterairinterfaceSIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)2ReferenceDEN/TETRA-02007-7KeywordsTETRA,radio,securityETSI650RoutedesLuciolesF-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 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)3ContentsIntellectualPropertyRights.7Foreword.71Scope.82References.83Definitionsandabbreviations.93.1Definitions.93.2Abbreviations.114Overviewofprotocol.124.1General.124.2TheDMchannel.134.3DMcallproceduresforoperationwithatype2DM-REP.144.3.1Constraintsontheframestructure.154.3.2Settingupacall.164.3.2.1Callset-upwithoutpresencecheck.164.3.2.2Callset-upwithpresencecheck.174.3.3Changeoverinacall.184.3.4Pre-emptionofaDMcall.194.3.5Terminatingacall.204.3.6DMshortdatacall.204.3.6.1Unacknowledgedshortdatamessage.204.3.6.2Acknowledgedshortdatamessage.215DM-MSlayer3servicedescriptionforoperationwithatype2DM-REP.226DM-MSlayer3protocolforoperationwithatype2DM-REP.227DM-MSlayer2servicedescriptionforoperationwithatype2DM-REP.228DM-MSlayer2protocolforoperationwithatype2DM-REP.238.1Introduction.238.1.1FunctionsoflowerMAC.238.1.2FunctionsofupperMAC.238.2InterfacebetweenlowerandupperMAC.238.3Basiccapabilitiesofthephysicallayer.238.3.1DM-MScapabilities.238.3.1.1DMonlyanddualmodecapableMSoperation.248.3.1.2DualwatchcapableMSoperation.248.4UsageofDMchannelwithtype2DM-REP.248.4.1DefinitionofDMchannel.258.4.1.1DMchannelarrangement.258.4.1.2DMchannelAoperation.258.4.1.3DMchannelBoperation.268.4.2DMchannelstates.278.4.2.1DMchannelstatedefinitions.278.4.2.2DM-MSchannelsurveillanceprocedures.278.4.2.2.1InitialdeterminationofDMchannelstate.278.4.2.2.2DM-MSchannelsurveillanceinidlemode.288.4.2.2.3DM-MSchannelsurveillanceatcallset-up.288.4.2.3MasterDM-MSchannelsurveillanceproceduresduringacall.298.4.2.4SlaveDM-MSchannelsurveillanceproceduresduringacall.298.4.2.4.1SlaveMSchannelsurveillanceduringcalltransaction.298.4.2.4.2SlaveMSsignalqualitymeasurementduringcalltransaction.298.4.2.4.3SlaveMSchannelsurveillanceduringreservation.308.4.2.5AdditionalmasterDM-MSsurveillanceprocedures.308.4.2.5.1SurveillancebychannelAmasterMS.30SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)48.4.2.5.2SurveillancebychannelBmasterMS.308.4.3DM-MACstates.318.4.3.1DM-MACstatedefinitions.318.4.3.2CriteriaforchangingDM-MACstate.318.4.4DM-MSchannelmonitoringprocedures.318.4.4.1DMchannelduringinitialcallset-upandnewcalltransactionbycurrentmasterMS.318.4.4.2DMchannelduringcallset-upwithpresencecheck.318.4.4.3DMchannelinoccupationduringacircuitmodecall.328.4.4.4DMchannelinreservationduringacircuitmodecall.328.4.4.5DMchannelinoccupationduringanSDScall.328.4.4.6DMchannelusageduringpre-emptionsignalling.328.4.4.7DMchannelusageduringtimingchangerequestsignalling.328.4.5Transmissionoflayer3messagesbyDM-MAC.328.4.5.1TransmissionofC-planemessagesbyDM-MAC.328.4.5.2TransmissionofU-planemessagesbyDM-MAC.338.4.6Transmissionoflayer2messagesgeneratedbyDM-MAC.338.4.7GeneralDM-MACprocedures.338.4.7.1DM-MACrepeattransmissions.338.4.7.2DM-MACframecountdownprocedure.338.4.7.3Useoftimers.338.4.7.4Linearization.348.4.7.5Fragmentation.348.4.7.6Fillbitindication.348.4.7.7Selectionofpseudoaddress.358.4.7.8Slotflagindication.358.4.7.9Requestsbitmap.358.4.7.10DMaspectsofdualwatchoperation.358.4.7.10.1Modelofoperation.358.4.7.10.2Dualwatchsynchronization.358.4.7.10.3Dualwatchprecedencerules.368.4.7.11Airinterfaceencryption.368.4.7.12ChannelAorBoperation.368.4.7.13Sendingshortdataasatransactionwithinacircuitmodecall.368.4.7.14SDStimeremaining.378.4.7.15Timingchangeprocedure.378.4.7.16Timingchangeatchangeoverorpre-emption.378.5MACproceduresfortransferofsignallingmessages.378.5.1FormationofMACPDU.378.5.2Addressing.378.5.3Useofairinterfaceencryption.378.5.4Fragmentationandreconstruction.378.5.5Fillbitadditionanddeletion.378.5.6Transmissionandreceptionofmessagesbylayer2.378.5.7Randomaccessprotocol.388.5.7.1Introduction.388.5.7.2ProceduresformasterDM-MS.388.5.7.2.1Indicatingframesavailableforrequests.388.5.7.2.2Monitoringframesavailableforrequests.388.5.7.2.3Responsetopre-emptionorchangeoverrequest.398.5.7.2.4Responsetotimingchangerequest.398.5.7.3ProceduresforrequestingDM-MS.398.5.7.3.1Preparingforrandomaccess.398.5.7.3.2Firsttransmissionofrequest.398.5.7.3.3Validaccessslots.408.5.7.3.4Waitingforresponse.418.5.7.3.5Subsequenttransmissionofrequest.418.5.7.3.6Abandoningrandomaccessattempt.418.6MACproceduresintrafficmode.419DM-REPlayer2protocolforatype2DM-REP.419.1Introduction.419.1.1FunctionsoflowerMAC.42SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)59.1.2FunctionsofupperMAC.429.2InterfacebetweenlowerandupperMAC.429.3BasiccapabilitiesoftheDM-REPphysicallayer.429.4UsageofDMchannel.439.4.1DM-REPoperation.439.4.1.1Channelstructure.439.4.1.2Channelsynchronization.439.4.2DM-REPstates.449.4.2.1DM-REPstatedefinitions.449.4.2.2DM-REPchannelsurveillanceprocedures.459.4.2.2.1DM-REPchannelsurveillancewhenidleonafreechannel(i.e.instate1).459.4.2.2.2DM-REPchannelsurveillancewhenidleonabusychannel(i.e.instate2).459.4.2.2.3DM-REPchannelsurveillancewhenidleatDM-MScallset-up.469.4.2.2.4DM-REPchannelsurveillancewhenactivewithoneDMchannelfree.469.4.2.3DM-REPchannelsurveillancewhenactiveduringacall.469.4.3CriteriaforchangingDM-REPstate.469.4.4DM-REPchannelmonitoringprocedures.469.4.4.1DMchannelduringcallset-upwithpresencecheck.479.4.4.2DMchannelinoccupationduringacircuitmodecall.479.4.4.3DMchannelinreservationduringacircuitmodecall.479.4.4.4DMchannelinoccupationduringanSDScall.479.4.4.5DMchannelfollowingpre-emptionorchangeoveracceptance.479.4.4.6DMchannelfollowingtimingchangeannouncement.489.4.5DM-REPpresencesignal.489.4.5.1Channelfree.489.4.5.1.1DM-REPidleonafreecarrier(i.e.instate1).489.4.5.1.2DM-REPactivewithoneDMchannelfree.489.4.5.2DMchannelinoccupation.489.4.5.3DMchannelinreservation.499.4.6DM-REPlinearization.499.5DM-REPproceduresforre-transmissionofsignallingmessages.509.5.1Re-transmissionofsignallingmessagesreceivedfromthemasterDM-MS.509.5.1.1Re-transmissionofmasterDM-MSsignallingmessagesreceivedinaDSB.509.5.1.1.1Generalprocedures.509.5.1.1.2Re-transmissionofDM-SETUPorDM-SETUPPRESmessage.509.5.1.1.3Re-transmissionofDM-SDSDATAorDM-SDSUDATAmessage.509.5.1.1.4Re-transmissionofothermessagesinaDSBwhennotusingmulti-slotregeneration.519.5.1.1.5Re-transmissionofothermessagesinaDSBduringtraffictransmissionwithmulti-slotregeneration.519.5.1.2Re-transmissionofmasterDM-MSsignallingmessagesreceivedinaDNB.519.5.1.2.1Calltransactionwithoutmulti-slotregeneration.519.5.1.2.2Calltransactionwithmulti-slotregeneration.519.5.1.3Regenerationofadditionalrepetitionsontheslavelink.519.5.2Re-transmissionofsignallingmessagesreceivedfromaslaveDM-MS.519.5.2.1Generalprocedures.519.5.2.2Re-transmissionofresponsemessagesfromaslaveDM-MS.519.5.2.3Re-transmissionofrandomaccessrequest.529.5.3DM-REPsignallingmechanisms.529.5.3.1Framecountdownprocedure.529.5.3.2Fillbitadditionanddeletion.529.5.3.3NullPDU.529.5.3.4Airinterfaceencryption.539.5.3.5Timingchangeprocedure.539.5.3.6RandomaccessproceduresforDM-REP.539.6DM-REPproceduresintrafficmode.5310PDUdescriptions.5311RadioaspectsofDM-MSforoperationwithatype2DM-REP.5511.1Introduction.5511.2Modulation.5511.3Radiotransmissionandreception.55SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)611.3.1Introduction.5511.3.2Frequencybandsandchannelarrangement.5511.3.3Referencetestplanes.5511.3.4Transmittercharacteristics.5511.3.5Receivercharacteristics.5511.3.6Transmitter/receiverperformance.5511.4Radiosub-systemsynchronization.5511.4.1Introduction.5511.4.2DefinitionsandgeneralrequirementsforsynchronizationofDM-MSs.5611.4.3Timebasecounters.5711.4.4RequirementsforthefrequencyreferencesourceofDMmobiles.5711.4.5RequirementsforthesynchronizationofaslaveDMmobile.5711.4.6SynchronizationrequirementsforamasterMSoperatingonchannelB.5711.5Channelcodingandscrambling.5711.6ChannelmultiplexingforDMoperationthroughatype2DM-REP.5711.7Radiosub-systemlinkcontrol.5812Radioaspectsofatype2DM-REP.5812.1Introduction.5812.2Modulation.5812.3Radiotransmissionandreception.5812.3.1Introduction.5812.3.2Frequencybandsandchannelarrangement.5812.3.3Referencetestplanes.5812.3.4Transmittercharacteristics.5812.3.4.1Outputpower.5812.3.4.2Powerclasses.5812.3.4.3Unwantedconductedemissions.5912.3.4.3.1Definitions.5912.3.4.3.2Unwantedemissionsclosetothecarrier.5912.3.4.3.3Unwantedemissionsfarfromthecarrier.5912.3.4.3.3.1Discretespurious.5912.3.4.3.3.2Widebandnoise.5912.3.4.3.4UnwantedemissionsduringtheLinearizationCHannel(LCH).5912.3.4.3.5Unwantedemissionsinthenon-transmitstate.5912.3.4.4Unwantedradiatedemissions.5912.3.4.5Radiofrequencytolerance.5912.3.4.6RFoutputpowertimemask.5912.3.4.7Transmitterintermodulationattenuation.5912.3.5Receivercharacteristics.6012.3.6Transmitter/receiverperformance.6012.4Radiosub-systemsynchronization.6012.4.1Introduction.6012.4.2Definitionsandgeneralrequirementsforsynchronization.6012.4.3Timebasecounters.6012.4.4Requirementsforthefrequencyreferencesourceofatype2DM-REP.6012.4.5Requirementsforthesynchronizationofatype2DM-REP.6012.5Channelcodingandscrambling.6112.6Channelmultiplexingforatype2DM-REP.6112.7Radiosub-systemlinkcontrol.61AnnexA(normative):TimersandconstantsinDM-MSandDM-REP.62History.63SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)7IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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)hasbeenproducedbyETSIProjectTerrestrialTrunkedRadio(TETRA).ThepresentdocumenthadbeensubmittedtoPublicEnquiryasETS300396-7.DuringtheprocessingforVoteitwasconvertedintoanEN.Thepresentdocumentispart7ofamulti-partdeliverablecoveringtheTechnicalrequirementsforDirectModeOperation(DMO),asidentifiedbelow:Part1:"Generalnetworkdesign";Part2:"Radioaspects";Part3:"MobileStationtoMobileStation(MS-MS)AirInterface(AI)protocol";Part4:"Type1repeaterairinterface";Part5:"Gatewayairinterface";Part6:"Security";Part7:"Type2repeaterairinterface";Part8:"ProtocolImplementationConformanceStatement(PICS)proformaspecification".NationaltranspositiondatesDateofadoptionofthisEN:8December2000DateoflatestannouncementofthisEN(doa):31March2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2001DateofwithdrawalofanyconflictingNationalStandard(dow):30September2001SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)81ScopeThepresentdocumentdefinestheTerrestrialTrunkedRadio(TETRA)DirectModeOperation(DMO).Itspecifiesthebasicairinterface,theinter-workingbetweenDirectMode(DM)groupsviarepeaters,andinter-workingwiththeTETRAVoiceplusData(V+D)systemviagateways.ItalsospecifiesthesecurityaspectsinTETRADMO,andtheintrinsicservicesthataresupportedinadditiontothebasicbearerandteleservices.ThispartappliestotheTETRADirectModeRepeater(DM-REP)airinterfaceandcontainsthespecifications,whereapplicable,ofthephysical,datalinkandnetworklayersaccordingtotheISOmodel.ThespecificationscontainedhereinapplytoaDM-REPasastand-aloneunitsupportingtwocallsontheairinterface(type2DM-REP).TheyalsocovertheoperationofaDirectModeMobileStation(DM-MS)withatype2DM-REP.NOTE1:ThespecificationsforaDirectModeRepeater/Gateway(DM-REP/GATE)combinedimplementationareprovidedinETS300396-5[5],togetherwiththespecificationsforaDirectModeGateway(DM-GATE).NOTE2:ThespecificationsforaDM-REPasastand-aloneunitsupportingasinglecallontheairinterface(type1DM-REP)areprovidedinEN300396-4[4].TheprotocolforaDM-MSoperatingwithatype2DM-REPisspecifiedinclauses5through8,10and11.Muchofthisprotocolisdefinedintheformofa"deltadocument"relativetothespecificationsprovidedinETS300396-2[2]andETS300396-3[3]fordirectMS-MSoperation,andEN300396-4[4]fortype1DM-REPoperation.Theseclausesdefinewheretheprotocolinparts2,3and4applieswithoutchange,orwhereitapplieswiththespecifiedamendments,replacementsoradditions.Wherenoreferencetoparts2,3or4exists,thesubclauseshouldberegardedasindependent.TheprotocolfortheDM-REPisspecifiedinclauses9and12.Thenormativeannexmainlyspecifiestheparametervaluesusedintheprotocol.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIETS300396-1:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part1:Generalnetworkdesign".[2]ETSIETS300396-2:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part2:Radioaspects".[3]ETSIETS300396-3(1998):"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part3:MobileStationtoMobileStation(MS-MS)AirInterface(AI)protocol".[4]ETSIEN300396-4:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part4:Type1repeaterairinterface".[5]ETSIETS300396-5:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part5:Gatewayairinterface".[6]ETSIETS300396-6:"TerrestrialTrunkedRadio(TETRA);DirectModeOperation(DMO);Part6:Security".SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)9[7]ETSIEN300392-2:"TerrestrialTrunkedRadio(TETRA);VoiceplusData(V+D);Part2:AirInterface(AI)".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BitErrorRatio(BER):ratioofthebitswronglyreceivedtoallbitsreceivedinagivenlogicalchannelcall:therearetwotypesofcall,individualcallorgroupcall.AnindividualcallisacompletesequenceofrelatedcalltransactionsbetweentwoDM-MSs.Therearealwaystwoparticipantsinanindividualcall.AgroupcallisacompletesequenceofrelatedcalltransactionsinvolvingtwoormoreDM-MSs.Thenumberofparticipantsinagroupcallisnotfixed,butisatleasttwo.Participantsmayjoin(lateentry)andleaveanongoinggroupcallcalltransaction:allofthefunctionsassociatedwithacompleteunidirectionaltransmissionofinformationduringacall.Acallismadeupofoneormorecalltransactions.Inasimplexcallthesecalltransactionsaresequentialcalleduserapplication:userapplicationwhichreceivesanincomingcallcallinguserapplication:userapplicationwhichinitiatesanoutgoingcallchangeover:withinacall,theprocessofeffectingatransferofthemasterrole(andhencetransmittingMS)attheendofonecalltransactionsothatanothercancommenceDirectMode(DM):modeofsimplexoperationwheremobilesubscriberradiounitsmaycommunicateusingradiofrequencieswhichmaybemonitoredby,butwhichareoutsidethecontrolof,theTETRAV+Dnetwork.DMisperformedwithoutinterventionofanybasestationDirectModeCallControl(DMCC):layer3entityresponsibleforsettingupandmaintainingacallinDMODMchannel:specificgroupingoftimeslotsintheDMmultiplexstructurerelatedtoaparticularDMRFcarrieri.e.DMfrequency(ortoapairofduplex-spacedRFcarriersforoperationwithatype1Bortype2DM-REPoratype1BDM-REP/GATE).Thegroupingmaynotalwaysbefixed,butinDMOwhenoperatinginfrequencyefficientmodeasanexample,therearetwoDMchannels,identifiedbythelettersAandBDirectModeMobileStation(DM-MS):physicalgroupingthatcontainsallofthemobileequipmentthatisusedtoobtainTETRADMservices.ADM-MSmayhaveoneofthreeroles:-master:iftheDM-MSiseitheractiveinacalltransactiontransmittingtrafficorcontroldata,orisreservingthechannelbymeansofchannelreservationsignalling;-slave:iftheDM-MSisreceivingtrafficand/orsignallinginacall;or-idle:iftheDM-MSisnotinacallDM-REPpresencesignal:messagetransmittedbyaDM-REPinordertoindicateitspresenceonanRFcarrierDualWatchMobileStation(DW-MS):MSthatiscapableofbothTETRADMOandTETRAV+Doperation.TheMSiscapableofperiodicallymonitoringtheV+DcontrolchannelwhileinaDMcall,aDMRFcarrierwhileinaV+Dcalland,whenidle,itperiodicallymonitorsboththeDMRFcarrierandtheV+DcontrolchannelDirectModegateway:devicethatprovidesgatewayconnectivitybetweenDM-MS(s)andtheTETRAV+Dnetwork.ThegatewayprovidestheinterfacebetweenTETRADMOandTETRAV+Dmode.Agatewaymayprovideonlythegatewayfunction(DM-GATE)ormayprovidethefunctionsofbothaDMrepeaterandaDMgatewayduringacall(DM-REP/GATE)SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)10DirectModeREPeater(DM-REP):devicethatoperatesinTETRADMOandprovidesarepeaterfunctiontoenabletwoormoreDM-MSstoextendtheircoveragerange.Itmaybeeitheratype1DM-REP,capableofsupportingonlyasinglecallontheairinterface,oratype2DM-REP,capableofsupportingtwocallsontheairinterface.Atype1DM-REPmayoperateoneitherasingleRFcarrier(type1ADM-REP)orapairofduplex-spacedRFcarriers(type1BDM-REP).Atype2DM-REPoperatesonapairofduplex-spacedRFcarriersframenumber:counterindicatingthetimingofframeswithinaDMOmultiframefrequencyefficientmode:modeofoperationwheretwoindependentDMcommunicationsaresupportedonasingleRFcarrier(orpairofduplex-spacedRFcarriersforoperationwithatype2DM-REP).InfrequencyefficientmodethetwoDMchannelsareidentifiedaschannelAandchannelBlogicalchannel:generictermforanydistinctdatapath.Logicalchannelsareconsideredtooperatebetweenlogicalendpointsmasterlink:communicationlinkusedfortransmissionsbetweenmasterDM-MSandDM-REPMediumAccessControl(MAC)block:unitofinformationtransferredbetweentheupperMACandlowerMACforaparticularlogicalchannel(e.g.SCH/ForSTCH).ThelowerMACperformschannelcodingforinsertionintotheappropriatephysicalslotorhalfslotMessageErasureRate(MER):ratioofthemessagesdetectedaswrongbythereceivertoallmessagesreceivedinagivenlogicalchannelnormalmode:modeofoperationwhereonlyoneDMcommunicationissupportedonanRFcarrier(orpairofduplex-spacedRFcarriersforoperationwithatype1BDM-REPortype1BDM-REP/GATE)presencesignal:messagetransmittedbyaDM-REPoragatewayinordertoindicateitspresenceonanRFcarrierQuartersymbolNumber(QN):timingofquartersymbolduration125/9µswithinaburstrecentuser:DM-MSthatwasmasterofthecalltransactionimmediatelypriortothecurrentmaster'scalltransactioninacallrecentuserpriority:servicewhichgivestherecentuserapreferredaccesstorequesttransmissionwhenthecurrentmasterisceasingitscalltransactioninagroupcall.Thisserviceiscontrolledbythecurrentmastersimplex:modeofworkinginwhichinformationcanbetransferredinbothdirectionsbutnotatthesametimeslavelink:communicationlinkusedfortransmissionsbetweentheDM-REPandslaveoridleDM-MSssurveillance:processofdeterminingthecurrentstateoftheDMRFcarrierwheninidlemodetimebase:devicewhichdeterminesthetimingstateofsignalstransmittedbyaDM-MStimeslotnumber:counterindicatingthetimingoftimeslotswithinaDMOframetype1call:callusingtheprotocoldefinedinEN300396-4[4].Therearetwovarietiesoftype1call:-type1Acall:whichisacallthroughatype1ADM-REP;-type1Bcall:whichisacallusingtheprotocolforoperationwithatype1BDM-REP.ADM-MSmaymakeatype1Bcallthroughatype1BDM-REP.Itmayalsomakeatype1Bcallthroughatype2DM-REPifpermittedbytheDM-REPtype1DM-REP:DMrepeaterthatsupportsasinglecallontheairinterface.Therearetwovarietiesoftype1DM-REP:-type1ADM-REP:whichoperatesonasingleRFcarrier;-type1BDM-REP:whichoperatesonapairofduplex-spacedRFcarriers,oneusedasthe"uplink"fromDM-MSstotheDM-REPandtheotherusedasthe"downlink"fromtheDM-REPtoDM-MSs.Theprotocolforoperationwithatype1DM-REP(eitheratype1Aoratype1BDM-REP)isbasedontheprotocolfornormalmodeinETS300396-3[3]SIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)11type2call:callusingtheprotocoldefinedinthepresentdocument.ADM-MSmaymakeatype2callonlythroughatype2DM-REPtype2DM-REP:DMrepeaterthatiscapableofsupportingtwosimultaneoustype2callsontheairinterface.Atype2DM-REPoperatesonapairofduplex-spacedRFcarriers,oneusedasthe"uplink"fromDM-MSstotheDM-REPandtheotherusedasthe"downlink"fromtheDM-REPtoDM-MSs.Theprotocolfortype2callsthroughatype2DM-REPisbasedontheprotocolforfrequencyefficientmodeinETS300396-3[3].(Atype2DM-REPmayalsooptionallyoffertype1BcallsusingtheprotocoldefinedinEN300396-4[4])V+Doperation:modeofoperationwhereMSsmaycommunicateviatheTETRAV+DairinterfacewhichiscontrolledbytheTETRASwitchingandManagementInfrastructure(SwMI)3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BERBitErrorRatioDLBDirectModeLinearizationBurstDLLDataLinkLayerDMDirectModeDM-GATEDirectModeGatewayDM-MSDirectModeMobileStationDM-REPDirectModeRepeaterDM-REP/GATEDirectModeRepeater/GatewayDMCCDirectModeCallControlentityDMODirectModeOperationDNBDirectModeNormalBurstDO-MSDirectModeOnlyMobileStationDSBDirectModeSynchronizationBurstDU-MSDualMode(V+D/DirectMode)switchableMobileStationDW-MSDualWatchMobileStationFNFrameNumberLCHLinearizationChannelMACMediumAccessControlMCCHMainControlChannelMERMessageErasureRatemodmodulo(baseforcounting)PDUProtocolDataUnitPLPhysicalLayerQNQuartersymbolNumberRFRadioFrequencySCCHSecondaryControlChannelSCHSignallingChannelSDSShortDataServiceSDUServiceDataUnitSTCHStealingChannelSwMISwitchingandManagementInfrastructureTCHTrafficChannelTNTimeslotNumberV+DVoiceplusDataSIST EN 300 396-7 V1.2.1:2003

ETSIETSIEN300396-7V1.2.1(2000-12)124Overviewofprotocol4.1GeneralTETRADMOusingaDMrepeater(DM-REP)offersthepossibilitytosupportDMcommunicationsoveranenhancedcoverageareafromthattypicallyachievedindirectMS-MSoperation.ADM-REPre-transmitsinformationreceivedfromoneDM-MStootherDM-MS(s)overtheDMairinterface.Itnormallyperformsde-encodingandre-encodingoperationsontheDM-MStransmissionbitspriortoregenerationinordertoimproveBERperformance.TheDM-REPmayoptionallygenerateapresencesignal.Thepurposeofth
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