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

SIST EN 300 396-7 V1.2.1:2003 is the Slovenian adoption of ETSI EN 300 396-7 Version 1.2.1. It specifies Terrestrial Trunked Radio (TETRA) Direct Mode Operation (DMO) for a type 2 repeater air interface, including the procedures a Direct Mode Mobile Station (DM-MS) and a Direct Mode Repeater (DM-REP) use to set up, maintain, change over and end calls through the repeater.

What does SIST EN 300 396-7 V1.2.1:2003 specify?

SIST EN 300 396-7 V1.2.1:2003 defines the technical requirements for a stand-alone type 2 DM-REP that supports two simultaneous calls on the air interface, and for a DM-MS operating with that repeater. It covers the physical layer, data link layer and the parts of layer 3 needed for repeater-based DMO.

The document is organized around general protocol overview, DM-MS layer 3 and layer 2 behavior, DM-REP layer 2 behavior, PDU descriptions, radio aspects, and a normative annex with timers and constants. It also uses references to other TETRA DMO parts where procedures are shared or adapted.

Annex	What it covers
Annex A	Timers and constants used by the DM-MS and DM-REP

What are the key requirements of SIST EN 300 396-7 V1.2.1:2003?

Channel use and repeater behavior

The standard defines a DM channel as a structured set of time slots on duplex-spaced RF carriers, with two channel identities, channel A and channel B. In practice, this tells implementers how two calls can share the repeater spectrum and how the mobile decides which channel is available.

The DM-REP repeats traffic and signaling between a master DM-MS and one or more slave DM-MSs. It may also send a presence signal, which tells mobiles that the repeater is switched on, in range, and possibly whether the channel is free, occupied or reserved.

Call setup, changeover and pre-emption

The DM-MS can set up a call either without presence check or, for individual calls, with presence check. The presence-check procedure requires an acknowledgement from the called DM-MS before traffic starts, which matters when the caller needs to know that the destination is actually available.

The standard also defines changeover, where one talker ends a transaction and another becomes the new master, and pre-emption, where a higher-priority user can take over an occupied channel. These procedures are important for operational control because they govern who may speak, when, and how the repeater relays the handover.

Short data and signaling

Clause 4 includes short data service (SDS) call procedures for unacknowledged and acknowledged short messages. The DM-REP relays the SDS signaling and, for acknowledged short data, forwards the response back to the sender.

Clause 8 and 9 define the MAC behavior for signaling transfer and repeater retransmission, including random access, frame countdown, fragmentation, fill bits, and encryption handling. In practice, this is the part that determines whether a station can be correctly heard, repeated and answered by the repeater.

Timing, surveillance and radio operation

For type 2 DM-REP operation, timing adjustment requests are not used. Instead, the DM-MS and DM-REP maintain synchronization through fixed frame and slot relationships, and dual watch mobiles also align with the TETRA Voice plus Data (V+D) control channel.

Clauses 11 and 12 cover the radio aspects of the DM-MS and the DM-REP, including modulation, transmission and reception, frequency arrangement, synchronization, channel coding and channel multiplexing. For engineers, this is the section that links protocol behavior to actual RF implementation and test setup.

What terms does SIST EN 300 396-7 V1.2.1:2003 define?

• Direct Mode Operation (DMO) - Simplex operation where mobiles communicate directly over radio frequencies outside the control of the TETRA V+D network.
• Direct Mode Mobile Station (DM-MS) - A mobile equipment group used to obtain TETRA DMO services, acting as master, slave or idle depending on the call.
• Direct Mode Repeater (DM-REP) - A device that relays DM traffic to extend coverage; in this part it is the type 2 version supporting two calls.
• Dual Watch Mobile Station (DW-MS) - A mobile station that can monitor both DMO and V+D frequencies and switch between them.
• Changeover - The process of transferring the master role within a call so another call transaction can continue.
• Channel A / channel B - The two DM channel identities used in frequency efficient mode on the repeater pair.

Who uses SIST EN 300 396-7 V1.2.1:2003?

SIST EN 300 396-7 V1.2.1:2003 is used by TETRA equipment designers, protocol engineers, integration teams and test laboratories working on DM-MS and DM-REP interoperability. It is also relevant to buyers and quality managers who need to specify repeater-based DMO behavior, especially for call control, signaling, synchronization and radio performance.

Which standards are used with SIST EN 300 396-7 V1.2.1:2003?

This standard relies on other parts of the TETRA DMO series and one V+D air interface standard:

• ETS 300 396-1 - General network design for DMO.
• ETS 300 396-2 - Radio aspects used as the basis for timing and RF behavior.
• ETS 300 396-3 - MS-MS air interface protocol, used as the base for many layer 2 and layer 3 procedures.
• EN 300 396-4 - Type 1 repeater air interface, referenced where type 2 procedures inherit or modify type 1 behavior.
• ETS 300 396-5 - Gateway air interface.
• ETS 300 396-6 - Security for DMO.
• EN 300 392-2 - TETRA Voice plus Data air interface, used for dual watch and V+D timing references.

What does the SIST EN 300 396-7 V1.2.1:2003 document contain?

The document contains protocol overview figures, detailed call-sequence examples, MAC procedures, PDU handling rules, and radio-layer requirements for both the DM-MS and the DM-REP. It also includes synchronization behavior, frame and slot usage, random access rules, and the radio characteristics needed for implementation and conformance testing. Annex A collects the timers and constants used by the procedures.

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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