SIST EN 300 737 V7.2.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for full rate traffic channels (GSM 08.60 version 7.2.1 Release 1998)
- Abstract
SMG#30ff
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 737 V7.2.1:2003 is the Slovenian version of ETSI EN 300 737 V7.2.1 for Digital cellular telecommunications system (Phase 2+) (GSM). It specifies in-band control of remote transcoders and rate adaptors for full rate traffic channels, including speech, Enhanced Full Rate (EFR), Adaptive Multi-Rate (AMR) speech and full rate data, so BSS and BTS equipment can exchange frame timing, codec control and maintenance information over the Abis interface.
What does SIST EN 300 737 V7.2.1:2003 specify?
SIST EN 300 737 V7.2.1:2003 specifies the frame structure and procedures for controlling a remote Transcoder/Rate Adaptor Unit (TRAU) from the Channel Codec Unit (CCU) by in-band signalling. It is the rule set for how GSM Phase 2+ equipment carries speech, data, timing and O&M information in TRAU frames.
The scope focuses on cases where 16 kbit/s traffic channels are used for full rate speech, EFR, AMR speech or full rate data. For 64 kbit/s traffic channels on the Abis interface, speech coding follows CCITT Recommendation G.711 and rate adaptation follows GSM 04.21 and GSM 08.20.
For AMR speech, the document covers 16 kbit/s submultiplexing for both full and half rate traffic channels. The 8 kbit/s submultiplexing is covered by GSM 08.61, and general Abis interface aspects are covered by GSM 08.51.
The document is organized into:
- Clause 1 - scope, references and abbreviations
- Clause 2 - general approach and functional model
- Clause 3 - frame structure and coding
- Clause 4 - procedures for control, timing, synchronization, data handling and O&M
- Annex A - informative change request history
What are the key requirements of SIST EN 300 737 V7.2.1:2003?
SIST EN 300 737 V7.2.1:2003 requires TRAU and CCU equipment to exchange 320-bit TRAU frames every 20 ms when the transcoder is remote to the BTS. In practice, this means the implementation must preserve both user payload and control information at a fixed frame cadence.
Frame types and bit coding
Clause 3 defines separate frame formats for FR/EFR speech, AMR speech, O&M, data, extended data and idle speech. The document also fixes where sync bits, control bits, data bits and time-alignment bits sit in the frame. For implementers, that determines exactly which bits carry speech, which bits carry control, and how the receiver recognizes the frame type.
Remote control by in-band signalling
Clause 4.1 states that the CCU uses the control bits in each TRAU frame to manage speech/data selection, data rate adaptation, downlink frame timing, DTX and, for AMR, codec mode adaptation. Optional fields also support Tandem Free Operation (TFO), phase alignment and pre-handover information. In practice, this is the mechanism that lets the BTS steer the remote TRAU without a separate control channel.
Time alignment and phase alignment
Clause 4.6 defines Initial Time Alignment and Static Time Alignment. The TRAU adjusts downlink timing in 250/500 µs steps, and AMR can use 125 µs precision with Time Alignment Extension (TAE). The same clause also describes phase alignment options for AMR using Phase Alignment Command (PAC), Phase Alignment Bit (PAB) or RATSCCH. This matters because call quality and buffer delay depend on the BTS and TRAU staying time-aligned.
Data handling and rate adaptation
Clause 4.7 covers 8 kbit/s and 16 kbit/s intermediate rate adaptation and the special handling for 14.5 kbit/s channel coding. It introduces the additional RAA and RAA' functions where the radio-interface format must be converted into TRAU frame format. For buyers and integrators, this is the part that tells them how data calls move between radio, Abis and 64 kbit/s transport.
Synchronization, errors and recovery
Clause 4.8 defines the frame-synchronization patterns and the recovery behavior after loss of synchronization. Clause 4.9 explains how undefined control-bit combinations and frame errors are handled, including Uplink Frame Error (UFE) reporting and call release on Remote Transcoder Failure. In practice, this is what prevents a faulty or misaligned TRAU from silently corrupting traffic.
Operation and maintenance
Clause 4.10 covers O&M transfer between the TRAU and the BSC, including the use of O&M TRAU frames with 264 data bits. It also defines the urgent alarm pattern as a continuous stream of binary 0s. That gives operators a documented way to move fault and status information between network elements.
What terms does SIST EN 300 737 V7.2.1:2003 define?
- Remote Transcoder/Rate Adaptor Unit (TRAU) - the unit that performs transcoding and rate adaptation when it is positioned away from the BTS.
- Channel Codec Unit (CCU) - the BTS-side unit that exchanges TRAU frames with the remote TRAU and controls it by in-band signalling.
- Adaptive Multi-Rate (AMR) - the speech family that uses codec mode control and special frame fields for timing, phase and TFO-related information.
- Tandem Free Operation (TFO) - an optional mode that exchanges codec information so speech can avoid unnecessary tandem transcoding.
- Time Alignment Command (TAC) - the control field that tells the TRAU how to delay or advance downlink frames.
- Uplink Frame Error (UFE) - a flag used to report that the received uplink TRAU frame had detectable errors.
Who uses SIST EN 300 737 V7.2.1:2003?
SIST EN 300 737 V7.2.1:2003 is used by GSM BSC, BTS and transcoder equipment designers, by network operators, and by test and integration teams. It is relevant whenever a network uses remote transcoding, rate adaptation, AMR, DTX or O&M exchange across the Abis interface.
In practice, users apply it to:
- design TRAU and CCU frame handling
- implement timing and synchronization behavior
- verify call setup, release and in-call modification
- check data-rate adaptation paths
- diagnose remote transcoder alarms and synchronization faults
What changed in SIST EN 300 737 V7.2.1:2003 from the previous edition?
The publication is version 7.2.1, and the change history records updates that led to this release. The listed changes include support for AMR-TFO, the introduction of AMR, 14.5 kbit/s channel coding, and earlier clarifications to time alignment and missing-data handling.
Which standards are used with SIST EN 300 737 V7.2.1:2003?
SIST EN 300 737 V7.2.1:2003 relies on a set of companion GSM and CCITT documents for detailed functions:
- GSM 01.04 - abbreviations and acronyms
- GSM 04.21 - rate adaptation on the MS-BSS interface
- GSM 06 series - speech processing, transcoding, lost-frame handling, comfort noise, DTX and VAD for full rate, EFR and AMR
- GSM 08.20 - rate adaptation on the BSS-MSC interface
- GSM 08.51, 08.54 and 08.58 - Abis interface aspects, Layer 1 structure and Layer 3 specification
- GSM 12.21 - network management procedures and messages on the Abis interface
- CCITT G.711, I.460 and V.110 - PCM speech coding, multiplexing/rate adaptation and DTE support
- GSM 05.09, GSM 08.61 and GSM 08.62 - link adaptation, half-rate in-band control and Tandem Free Operation
What does the SIST EN 300 737 V7.2.1:2003 document contain?
SIST EN 300 737 V7.2.1:2003 contains frame diagrams, bit maps and coding tables for the main TRAU frame types, plus procedures for using them. Clause 3 shows the layout of FR/EFR speech frames, AMR frames, data frames, extended data frames, O&M frames and idle speech frames, including the sync pattern and control-bit placement.
Clause 4 gives the operating procedures for resource allocation, resource release, in-call modification, time alignment, DTX handling, frame synchronization, error recovery and O&M transfer. The figures illustrate the reference model and the rate-adaptation paths for 64 kbit/s, 16 kbit/s and 14.5 kbit/s cases. Annex A provides the change-request history for the document.
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Frequently Asked Questions
SIST EN 300 737 V7.2.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for full rate traffic channels (GSM 08.60 version 7.2.1 Release 1998)". This standard covers: SMG#30ff
SMG#30ff
SIST EN 300 737 V7.2.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 737 V7.2.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for full rate traffic channels (GSM 08.60 version 7.2.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 737 Version 7.2.1SIST EN 300 737 V7.2.1:2003en01-december-2003SIST EN 300 737 V7.2.1:2003SLOVENSKI
STANDARD
ETSIEN300737V7.2.1(2000-09)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);In-bandcontrolofremotetranscodersandrateadaptorsforfullratetrafficchannels(GSM08.60version7.2.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)2(GSM08.60version7.2.1Release1998)ReferenceREN/SMG-020860Q7R1KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°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:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)3(GSM08.60version7.2.1Release1998)ContentsIntellectualPropertyRights.5Foreword.51Scope.61.1References.61.2Abbreviations.82GeneralApproach.83FrameStructure.113.1FramesforSpeechServices.113.1.1FramesforFullRateandEnhancedFullRateSpeech.113.1.2FramesforAdaptiveMulti-RateSpeech.123.2O&MFrames.133.3DataFrames.143.3.1DataFrame(forSynchronization).143.3.2Extendeddataframe(E-TRAU:datatransport).153.4IdleSpeechFrames.163.5Coding.163.5.1CodingofFramesforSpeechServices.173.5.1.1CodingofFramesforFullRateandEnhancedFullRateSpeech.173.5.1.1.1CodingofControlbits(C-bits).173.5.1.1.2CodingofDataBits(D-bits).183.5.1.1.3TimeAlignmentBits(T1…T4).183.5.1.2CodingofFramesforAdaptiveMulti-RateSpeech.193.5.1.2.1CodingofControlbits(C-bits).193.5.1.2.2CodingofDatabits(D-bits).213.5.1.2.3TimeAlignmentBits(T1…T4).243.5.2CodingofO&MFrames.253.5.3CodingofDataFrames.253.5.4CodingofExtendedDataFrames.253.5.5CodingofIdleSpeechFrames.263.6OrderofBitTransmission.264Procedures.264.1RemoteControlofTranscodersandRateAdaptors.264.2ResourceAllocation.274.3ResourceRelease.274.4InCallModification.284.5TransferofIdleFrames,HandlingofMissingData.284.5.1InFullRatedatacase.284.5.2InFullRatespeechcase.284.5.3InEnhancedFullRatespeechcase.284.5.4InAdaptiveMulti-Ratespeechcase.284.6ProceduresforSpeechServices.294.6.1TimeAlignmentofSpeechServiceFrames.294.6.1.1InitialTimeAlignmentState.294.6.1.2TheStaticTimeAlignmentState.304.6.1.2.1PhaseAlignmentofCodec_Mode_IndicationforAMR.304.6.1.3InitiationatResourceAllocation.324.6.1.4TimeAlignmentDuringHandover.324.6.1.4.1BSSExternalHandover.324.6.1.4.2BSSInternalHandover.324.6.2ProceduresforDiscontinuousTransmission(DTX).324.6.2.1DTXproceduresintheuplinkdirection.334.6.2.2DTXproceduresinthedownlinkdirection.334.7ProceduresforDataFrames.334.7.19,6and4,8kbit/schannelcoding.33SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)4(GSM08.60version7.2.1Release1998)4.7.1.1TheRAAFunction.344.7.1.2TheRA1/RA1'Function.344.7.1.3TheRA2Function.344.7.1.4Proceduresfor8kbit/sintermediaterateadaptionrate.344.7.1.5Proceduresfor16kbit/sintermediaterateadaptionrate.354.7.1.6SupportofNon-TransparentBearerApplications.354.7.214,5kbit/schannelcoding.354.7.2.1TheRAA'Function.354.7.2.2TheRA1'/RAA'Function.354.7.2.3TheRA2Function.354.8FrameSynchronization.364.8.1SearchforFrameSynchronization.364.8.2FrameSynchronizationAfterPerformingDownlinkTimingAdjustments.364.8.3FrameSynchronizationMonitoringandRecovery.364.9Correction/detectionofbiterrorsontheterrestrialcircuits.374.9.1ErrorDetectionontheControlBits.374.9.1.1GeneralProcedure.374.9.1.2FramesforSpeechServices.374.9.2Handlingofframesreceivedwitherrors.384.9.2.1IncaseofFullRatespeech.384.9.2.2IncaseofEnhancedFullRateandAdaptiveMulti-Ratespeech.384.10ProceduresforOperation&Maintenance.384.10.1TransferofO&MInformationBetweentheTRAUandtheBSC.384.10.2ProceduresintheTRAU.394.10.3ProceduresintheBSC.394.10.3.1UseofO&MFrames.394.10.4ProceduresintheBTS.39AnnexA(informative):ChangeRequestHistory.40History.41SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)5(GSM08.60version7.2.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).ThepresentdocumentspecifiestheinbandcontrolofremotetranscodersandrateadaptorsforFullRatespeech,EnhancedFullRatespeech,AdaptiveMulti-RatespeechandfullratedatawithintheDigitalcellulartelecommunicationssystem(Phase2+).ThespecificationfromwhichthepresentdocumenthasbeenderivedwasoriginallybasedonCEPTdocumentation,hencethepresentationofthepresentdocumentmaynotbeentirelyinaccordancewiththeETSI/PNERules.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:12May2000DateoflatestannouncementofthisEN(doa):31August2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):29February2001DateofwithdrawalofanyconflictingNationalStandard(dow):29February2001SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)6(GSM08.60version7.2.1Release1998)1ScopeWhen64kbit/strafficchannelsareusedontheAbisinterface,thespeechshallbecodedaccordingtoCCITTRecommendationG.711andthedatarateadaptationshallbeasspecifiedinGSM04.21andGSM08.20.Inthecasewhere16kbit/strafficchannelsareusedforfullratespeech,enhancedfullratespeech,AdaptiveMulti-Ratespeechorfullratedataservice,thenthepresentdocumentshallapplyforframestructureandforcontrolofremotetranscodersandadditionalrateadaptors.ForAdaptiveMulti-Ratespeechthepresentdocumentspecifiesthe16kBit/ssubmultiplexing,bothforthefullandthehalfratetrafficchannels(TCH/AFSandTCH/AHS).Thespecificationfor8kBit/ssubmultiplexingisgiveninGSM08.61,bothforthefullandthehalfratetrafficchannels(TCH/AFSandTCH/AHS).TheuseandgeneralaspectsoftheAbisinterfacearegiveninGSM08.51.NOTE:ThepresentdocumentshouldbeconsideredtogetherwiththeGSM06seriesofspecifications,GSM04.21(RateAdaptationontheMS-BSSInterface)andGSM08.20(RateAdaptationontheBS/MSCInterface).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]GSM04.06:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStation-BaseStationSystem(MS-BSS)interface;DataLink(DL)layerspecification".[3]GSM04.21:"Digitalcellulartelecommunicationssystem(Phase2+);RateadaptionontheMobileStation-BaseStationSystem(MS-BSS)interface".[4]GSM06.01:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Processingfunctions".[5]GSM06.10:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Transcoding".[6]GSM06.11:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[7]GSM06.12:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Comfortnoiseaspectforfullratespeechtrafficchannels".[8]GSM06.31:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;DiscontinuousTransmission(DTX)forfullratespeechtrafficchannels".[9]GSM06.32:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetector(VAD)".SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)7(GSM08.60version7.2.1Release1998)[10]GSM08.20:"Digitalcellulartelecommunicationssystem(Phase2+);RateadaptionontheBaseStationSystem-Mobile-servicesSwitchingCentre(BSS-MSC)interface".[11]GSM08.51:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Generalaspects".[12]GSM08.54:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Layer1structureofphysicalcircuits".[13]GSM08.58:"Digitalcellulartelecommunicationssystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interface;Layer3specification".[14]GSM12.21:"Digitalcellulartelecommunicationssystem(Phase2+);NetworkManagement(NM)proceduresandmessageontheA-bisinterface".[15]CCITTRecommendationG.711:"Pulsecodemodulation(PCM)ofvoicefrequencies".[16]CCITTRecommendationI.460:"Multiplexing,rateadaptionandsupportofexistinginterfaces".[17]CCITTRecommendationV.110:"Supportofdataterminalequipments(DTEs)withV-Seriesinterfacesbyanintegratedservicesdigitalnetwork".[18]GSM06.51:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullratespeechprocessingfunctions".[19]GSM06.60:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullratespeechtranscoding".[20]GSM06.61:"Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframesforEnhancedFullratespeechchannels".[21]GSM06.62:"Digitalcellulartelecommunicationssystem(Phase2+);ComfortnoiseaspectforEnhancedFullratespeechtrafficchannels".[22]GSM06.81:"Digitalcellulartelecommunicationssystem(Phase2+);DiscontinuousTransmission(DTX)forEnhancedFullratespeechtrafficchannel".[23]GSM06.82:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetection(VAD)".[24]GSM06.71:"Digitalcellulartelecommunicationssystem;AdaptiveMulti-Ratespeechprocessingfunctions,GeneralDescription".[25]GSM06.90:"Digitalcellulartelecommunicationssystem;AdaptiveMulti-Ratespeechtranscoding".[26]GSM06.91:"Digitalcellulartelecommunicationssystem;SubstitutionandmutingoflostframesforAdaptiveMulti-Ratespeechtrafficchannels".[27]GSM06.92:"Digitalcellulartelecommunicationssystem;ComfortnoiseaspectforAdaptiveMulti-Ratespeechtrafficchannels".[28]GSM06.93:"Digitalcellulartelecommunicationssystem;DiscontinuousTransmission(DTX)forAdaptiveMulti-Ratespeechtrafficchannels".[29]GSM06.94:"Digitalcellulartelecommunicationssystem;VoiceActivityDetection(VAD)forAdaptiveMulti-Ratespeechtrafficchannels".[30]GSM05.09:"Digitalcellulartelecommunicationssystem;LinkAdaptation".[31]GSM08.61:Digitalcellulartelecommunicationssystem;Inbandcontrolofremotetranscodersandrateadaptorsforhalfratetrafficchannels".[32]GSM08.62:"Digitalcellulartelecommunicationssystem;InbandTandemFreeOperation(TFO)ofSpeechCodecs".SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)8(GSM08.60version7.2.1Release1998)1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.Additionally:AMRAdaptiveMulti-RateCMCCodec_Mode_CommandCMICodec_Mode_IndicationCMRCodec_Mode_RequestOnsetSpeechOnsetFrameClassificationPABPhaseAlignmentBitPACPhaseAlignmentCommandRATSCCHRobustAMRTrafficSynchronisedControlCHannelRIFRequestorIndicationFlagTACTimeAlignmentCommandTAETimeAlignmentExtensionTFOTandemFreeOperationTFOETFOEnableUFEUplinkFrameError2GeneralApproachWhenthetranscoders/rateadaptorsarepositionedremotetotheBTS,theinformationbetweentheChannelCodecUnit(CCU)andtheremoteTranscoder/RateAdaptorUnit(TRAU)istransferredinframeswithafixedlengthof320bits(20ms).Inthepresentdocument,theseframesaredenoted"TRAUframes".Withintheseframes,boththespeech/dataandtheTRAUassociatedcontrolsignalsaretransferred.TheAbisinterfaceshouldbethesameifthetranscoderispositioned1)attheMSCsiteoftheBSSorifitispositioned2)attheBSCsiteoftheBSS.Incase1),theBSCshouldbeconsideredastransparentfor16kbit/schannels.Incaseof4,8and9,6kbit/schannelcodingwhendataisadaptedtothe320bitframes,aconversionfunctionisrequiredinadditiontotheconversion/rateadaptionspecifiedinGSM08.20.ThisfunctionconstitutestheRAA.Incaseof14,5kbit/schannelcoding,noRAArateadaptionisrequiredbecauseV.110framingisnotused.TheTRAUisconsideredapartoftheBSC,andthesignallingbetweentheBSCandtheTRAU(e.g.detectionofcallrelease,handoverandtransferofO&Minformation)maybeperformedbyusingBSCinternalsignals.ThesignallingbetweentheCCUandtheTRAU,usingTRAUframesasspecifiedinthepresentdocument,ismandatorywhentheAbisinterfaceisapplied.NOTE:Ifstandard64kbit/sswitchingisusedintheBSC,multiplexingaccordingtoCCITTRecommendationI.460shouldapplyatbothsidesoftheswitch.Infigure2.1,apossibleconfigurationoftheTRAUandtheCCUisshown.ThefunctionsinsidetheTRAUare:-"RemoteTranscoderandRateAdaptorControlFunction"(RTRACF);-"RemoteSpeechHandlerFunction"(RSHF);-TheRAAfunctionincaseof4,8and9,6kbit/schannelcoding;-TheRAA'functionincaseof14,5kbit/schannelcoding;-TheRA2function;-Thetranscoderfunction.-OptionallytheTFOfunctions(seeGSM08.62).SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)9(GSM08.60version7.2.1Release1998)ThefunctionsinsidetheCCUare:-"TranscoderandRateAdaptorControlFunction"(TRACF);-"SpeechHandlerFunction"(SHF);-TheRAAfunctionincaseof4,8kbit/sand9,6kbit/schannelcoding;-TheRA1/RA1'functionincaseof4,8kbit/sand9,6kbit/schannelcoding;-TheRA1'/RAA'functionincaseof14,5kbit/schannelcoding;-Thechannelcodecfunction;-IfAMRissupported,theLinkAdaptation(seeGSM05.09).ThepresentdocumentwillnotdescribetheproceduresinsidetheTRAUandtheCCU.Thelayoutinfigure2.1isonlyintendedasareferencemodel.SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)10(GSM08.60version7.2.1Release1998)#$%&!*+,,-&,#.&!)+/&!0NOTE1:ThisrecommendationassumestheDTXhandlerfunctiontobeapartoftheTranscoderFunction.NOTE2:Thisfigureappliesonlyfor4,8kbit/sand9,6kbit/schannelcoding.Figure2.1:FunctionalentitiesforhandlingofremotecontrolofremotetranscodersandrateadaptorsSIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)11(GSM08.60version7.2.1Release1998)3FrameStructure3.1FramesforSpeechServices3.1.1FramesforFullRateandEnhancedFullRateSpeechBitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13C14C1541D1D2D3D4D5D6D75D8D9D10D11D12D13D14D1561D16D17D18D19D20D21D227D23D24D25D26D27D28D29D3081D31D32D33D34D35D36D379D38D39D40D41D42D43D44D45101D46D47D48D49D50D51D5211D53D54D55D56D57D58D59D60121D61D62D63D64D65D66D6713D68D69D70D71D72D73D74D75141D76D77D78D79D80D81D8215D83D84D85D86D87D88D89D90161D91D92D93D94D95D96D9717D98D99D100D101D102D103D104D105181D106D107D108D109D110D111D11219D113D114D115D116D117D118D119D120201D121D122D123D124D125D126D12721D128D129D130D131D132D133D134D135221D136D137D138D139D140D141D14223D143D144D145D146D147D148D149D150241D151D152D153D154D155D156D15725D158D159D160D161D162D163D164D165261D166D167D168D169D170D171D17227D173D174D175D176D177D178D179D180281D181D182D183D184D185D186D18729D188D189D190D191D192D193D194D195301D196D197D198D199D200D201D20231D203D204D205D206D207D208D209D210321D211D212D213D214D215D216D21733D218D219D220D221D222D223D224D225341D226D227D228D229D230D231D23235D233D234D235D236D237D238D239D240361D241D242D243D244D245D246D24737D248D249D250D251D252D253D254D255381D256D257D258D259D260C16C1739C18C19C20C21T1T2T3T4SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)12(GSM08.60version7.2.1Release1998)3.1.2FramesforAdaptiveMulti-RateSpeechBitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13C14C1541C16C17C18C19C20C21C225C23C24C25D1D2D3D4D561D6D7D8D9D10D11D127D13D14D15D16D17D18D19D2081D21D22D23D24D25D26D279D28D29D30D31D32D33D34D35101D36D37D38D39D40D41D4211D43D44D45D46D47D48D49D50121D52D52D53D54D55D56D5713D58D59D60D61D62D63D64D65141D66D67D68D69D70D71D7215D73D74D75D76D77D78D79D80161D81D82D83D84D85D86D8717D88D89D90D91D92D93D94D95181D96D97D98D99D100D101D10219D103D104D105D106D107D108D109D110201D111D112D113D114D115D116D11721D118D119D120D121D122D123D124D125221D126D127D128D129D130D131D13223D133D134D135D136D137D138D139D140241D141D142D143D144D145D146D14725D148D149D150D151D152D153D154D155261D156D157D158D159D160D161D16227D163D164D165D166D167D168D169D170281D171D172D173D174D175D176D17729D178D179D180D181D182D183D184D185301D186D187D188D189D190D191D19231D193D194D195D196D197D198D199D200321D201D202D203D204D205D206D20733D208D209D210D211D212D213D214D215341D216D217D218D219D220D221D22235D223D224D225D226D227D228D229D230361D231D232D233D234D235D236D23737D238D239D240D241D242D243D244D245381D246D247D248D249D250D251D25239D253D254D255D256T1T2T3T4SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)13(GSM08.60version7.2.1Release1998)3.2O&MFramesBitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13C14C1541D1D2D3D4D5D6D75D8D9D10D11D12D13D14D1561D16D17D18D19D20D21D227D23D24D25D26D27D28D29D3081D31D32D33D34D35D36D379D38D39D40D41D42D43D44D45101D46D47D48D49D50D51D5211D53D54D55D56D57D58D59D60121D61D62D63D64D65D66D6713D68D69D70D71D72D73D74D75141D76D77D78D79D80D81D8215D83D84D85D86D87D88D89D90161D91D92D93D94D95D96D9717D98D99D100D101D102D103D104D105181D106D107D108D109D110D111D11219D113D114D115D116D117D118D119D120201D121D122D123D124D125D126D12721D128D129D130D131D132D133D134D135221D136D137D138D139D140D141D14223D143D144D145D146D147D148D149D150241D151D152D153D154D155D156D15725D158D159D160D161D162D163D164D165261D166D167D168D169D170D171D17227D173D174D175D176D177D178D179D180281D181D182D183D184D185D186D18729D188D189D190D191D192D193D194D195301D196D197D198D199D200D201D20231D203D204D205D206D207D208D209D210321D211D212D213D214D215D216D21733D218D219D220D221D222D223D224D225341D226D227D228D229D230D231D23235D233D234D235D236D237D238D239D240361D241D242D243D244D245D246D24737D248D249D250D251D252D253D254D255381D256D257D258D259D260D261D26239D263D264S1S2S3S4S5S6SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)14(GSM08.60version7.2.1Release1998)3.3DataFrames3.3.1DataFrame(forSynchronization)BitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13C14C1541.51.61.71Dataframeposition18163bits.91(72bitsincludingbitposition1)1011111211311411511611Dataframeposition2171181191201211221231241251Dataframeposition3261271281291301311321331Dataframeposition4341351361371381391SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)15(GSM08.60version7.2.1Release1998)3.3.2Extendeddataframe(E-TRAU:datatransport)BitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13M1M24D1D2.567Datablockof288databitsandM1,M2.89101112131415161718192021222324252627282930313233343536373839.D287D288SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)16(GSM08.60version7.2.1Release1998)3.4IdleSpeechFramesBitnumberOctetno.1234567800000000010000000021C1C2C3C4C5C6C73C8C9C10C11C12C13C14C15411111111511111111611111111711111111811111111911111111101111111111111111111211111111131111111114111111111511111111161111111117111111111811111111191111111120111111112111111111221111111123111111112411111111251111111126111111112711111111281111111129111111113011111111311111111132111111113311111111341111111135111111113611111111371111111138111111C16C1739C18C19C20C21T1T2T3T43.5CodingInthefollowingsubclauses,thecodingoftheframesisdescribed.Anyspareornotusedcontrolbitsshouldbecodedbinary"1".Forallframetypestheoctet0,1andthefirstbitofoctets2,4,6,8,.38areusedasframesync.SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)17(GSM08.60version7.2.1Release1998)3.5.1CodingofFramesforSpeechServices3.5.1.1CodingofFramesforFullRateandEnhancedFullRateSpeech3.5.1.1.1CodingofControlbits(C-bits)DescriptionUplinkDownlinkC1C2C3C4C5C1C2C3C4C5FrametypeFRSpeech:00010.Speech:11100(BitsC1-C5).EFRSpeech:11010Speech:11010TimeBinarynumberindicatingtheBinarynumberindicatingAlignmentrequiredtimingadjustmenttothetimingadjustmentmade.(BitsC6-C11)bemadeinstepsof250/500µs.ThefollowingvaluesapplyforthecodingC6C7.C11000000Nochangeinframetiming000001Delayframe1x500µs000010Delayframe2x500µs.100111Delayframe39x500µs101000Notused.111101Notused111110Delayframe1x250µs111111Advanceframe250µsFrameindicators.ThedefinitionC12:BFIC12-C15:Spareandcodingoftheseindicators0:BFI=0aregiveninGSM06.31.1:BFI=1IFFR.SpeechC13C14:SIDELSEBitsC12-C1600:SID=0C12:UFE01:SID=10:UFE=0baduplinkframe10:SID=21:UFE=1goodup-linkframeDownlinkUplinkFrameErrorC15:TAF(UFE)C120:TAF=0(seesubclause4.8.3)1:TAF=1C13-C15:spareC16:SpareC16:SP0:SP=01:SP=1DTXindicatorC17:DTXdC17:Spare0:DTXnotapplied1:DTXappliedBitsC18-C21SpareSpareSIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)18(GSM08.60version7.2.1Release1998)3.5.1.1.2CodingofDataBits(D-bits)ForFullRateSpeech:BitsD1.D260:Speechblocktransferredinthesameorderasoutputfromthetranscoder(seeGSM06.10).ForEnhancedFullRateSpeech:Thespeechblockissubdividedinfivesubsets.Theorderwithinagivensubsetisthesameasoutputfromthetranscoder(seeETS300726,GSM06.60).Threeparitybitsareaddedattheendofeachsub-set.Theseparitybitsareaddedtothebitsofthesubset,accordingtoadegenerate(shortened)cycliccodeusingthegeneratorpolynomial:g(D)=D3+D+1Theencodingofthecycliccodeisperformedinasystematicformwhichmeansthat,inGF(2),thepolynomial:d(m)Dn+d(m+1)Dn-1+.+d(m+n-3)D3+p(0)D2+p(1)D+p(2)wherep(0),p(1),p(2)aretheparitybits,whendividedbyg(D),yieldsaremainderequalto:1+D+D2ForeveryCRC,thetransmissionorderisp(0)firstfollowedbyp(1)andp(2)successively.BitD1:spare(binary"1").BitsD2.D39:IndexesoftheLSFsubmatrices.BitsD40.D42:CRCoverbitsD1toD22,D25toD27andD29.BitsD43.D95:Indexesoftheparametersoffirstsub-frame.BitsD96.D98:CRCoverbitsD43toD52,D91andD92.BitsD99.D148:Indexesoftheparametersofsecondsub-frame.BitsD149.D151:CRCoverbitsD99toD103,D105,D144andD145.BitsD152.D204:Indexesoftheparametersofthirdsub-frame.BitsD205.D207:CRCoverbitsD152toD161,D200andD201.BitsD208.D257:Indexesoftheparametersoffourthsub-frame.BitsD258.D260:CRCoverbitsD208toD212,D214,D253andD254.3.5.1.1.3TimeAlignmentBits(T1…T4)BitsT1.T4:Bitspositionedattheendofthedownlinkframes.Ifthetimingoftheframeistobeadvanced250µs,these4bitsarenottransferredinordertoreducetheframelengthaccordingly.Whentransferredthebitsaresettobinary"1".SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)19(GSM08.60version7.2.1Release1998)3.5.1.2CodingofFramesforAdaptiveMulti-RateSpeech3.5.1.2.1CodingofControlbits(C-bits)ControlBitsDescriptionUplinkDescriptionDownlinkC1.C5Frame_Type(Codec_Type)Frame_Type(Codec_Type)C6.C11TimeAlignmentCommand(TAC)orPhaseAlignmentControl(PAC)orTFOInformationorHandoverInformationTimeAlignmentCommand(TAC)orPhaseAlignmentControl(PAC)orTFOInformationorHandoverInformationC12RequestorIndicationFlag(RIF)RequestorIndicationFlag(RIF)C13spare,setto1UplinkFrameError(UFE)C14.C15.C16Config_ProtConfig_ProtC17.C18Message_NoMessage_NoC19DTXindownlinkrequested(DTXd)spare,reservedforTFO(see08.62)C20TFOEnabled(TFOE)spare,reservedforTFO(see08.62)C21.C22Frame_Classification,Rx_TypeFrame_Classification,Tx_TypeC23.C24.C25Codec_Mode_Indication(RIF==0)orCodec_Mode_Request(RIF==1)or0.0.0(Frame_Classification==0.0)Codec_Mode_Indication(RIF==0)orCodec_Mode_Request(RIF==1)or0.0.0(Frame_Classification==0.0)DetailedDescription:FrameType:ThecodingoftheFrame_Type(alsocalled"Codec_Type")forAMRisidenticalinuplinkanddownlink.C1.C5:0.0.1.1.0:AdaptiveMulti-RateCodec.TimeAlignmentField:TheTimeAlignmentField(BitsC6.C11)isusedtocarryeithertheTimeAlignmentCommand(TAC),thePhaseAlignmentControl(PAC)ortheTFOandHandoverInformation.TheTimeAlignmentCommandiscodedasfortheFullRateandEnhancedFullRate(subclause3.5.1.1.1).TimeAlignmentCommand(TAC):Intheuplinkdirection(BTStoTRAU)theTACindicatestherequiredtimingadjustmentforthedownlinkTRAUframetobemadebytheTRAUin250/500µssteps.C6.C11:0.0.0.0.0.0Nochangeinframetiming0.0.0.0.0.1Delayframe1x500µs(sendfouradditionalT-Bit-pairsaftertheendoftheTRAUFrame)0.0.0.0.1.0Delayframe2x500µs(sendeightadditionalT-Bit-pairsaftertheendoftheTRAUFrame)…1.0.0.1.1.1Delayframe39x500µs(send156additionalT-Bit-pairsaftertheendoftheTRAUFrame)(1.0.1.0.0.0to1.1.0.1.1.1:16code-points,unused,reserved)(1.1.1.0.0.0to1.1.1.0.1.1:4code-points,reservedforTFOandHandoverInformation)(1.1.1.1.0.0reserved,unused)(1.1.1.1.0.1reservedforAMRCMI/CMRPhaseAlignmentCommand(PAC),nochangeinframetiming)1.1.1.1.1.0Delayframeby250µs(sendtwoadditionalT-Bit-pairsaftertheendoftheTRAUFrame)1.1.1.1.1.1Advanceframeby250µs(donotsendthetwoT-Bit-pairsattheendoftheTRAUFrame).PhaseAlignmentCommand(PAC)(usefulwhenTFOisnotsupportedordisabled):ThePhaseAlignmentCommand(PAC)canbeusedbytheBTStocommandtheTRAUtochange(invert)thephaseofCMI/CMR,respectivelyRIF,indownlinkTRAUframes,seesubclause4.6.1.2.1.C6.C11:1.1.1.1.0.1AMRCMI/CMRPhaseAlignmentCommand(PAC),nochangeinframetiming.InNo_SpeechframesthePhaseAlignmentCommandmayoptionallybetransmittedbyoneadditionalbit(PAB,seesubclause3.5.1.2.2)thatallowsadirecttimeandphasealignmentinonestep.SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)20(GSM08.60version7.2.1Release1998)TFOInformation(recommendedwhenTFOissupported,seeGSM08.62):C6.C111.1.1.0.0.01.1.1.0.0.11.1.1.0.1.0ThesethreecodesarereservedforTandemFreeOperation(seeGSM08.62).Theyresultinnochangeinframetiming.IftheBTSdoesnotsupportTFOorTFOisdisabledthesecodesshallnotbeused.TheproceduretoexchangethisinformationbetweenBTSandTRAUisdescribedinGSM08.62.HandoverInformation(recommendedwhenPre-HandoverWarningissupported):C6.C11:1.1.1.0.1.1Handover_SoonHandoveristobeexpectedsoon.Thiscodeisused,iftheBSCandBTSsupportPre-HandoverWarning.Itresultsinnochangeinframetiming.TheBTSshallrepeatthisinformationaslongasitisvalidineveryframewherenootherinformationhastobetransmittedintheTimeAlignmentField.TheTRAUshallnotreflectoracknowledgeit.TheproceduretoexchangethisinformationincaseofTFOisdescribedinGSM08.62.RequestorIndicationFlag(RIF):ThisflagindicatesthephaseoftheCodec_Mode_Indication(RIF==0)respectivelytheCodec_Mode_Request(RIF==1).Ithasthesamemeaninginuplinkandindownlink.Typicallythisflagtoggleseveryframe.ExceptionsmayoccurathandoverandCMI/CMRphasealignment,seesubclause4.6.1.2.1.UplinkFrameError(UFE):IndownlinktheUFEindicatesthatthemostrecentlyreceiveduplinkTRAUframehaddetectableerrors.Inuplinkthisbitshallbesetto"1".UFE==0:"UplinkFramereceivedwithErrors";UFE==1:"UplinkFramereceivedwithoutErrors".Note:theUFEisnotrelatedtotheframeclassification(Rx_Type)ascomputedbytheBTSradioreceiver.ItisrelatedtoinconsistenciesintheTRAUframesynchronization,controlbitsorCRCswithintheTRAUframe.Config_ProtThisfieldisreservedfortheConfigurationProtocolincaseofTandemFreeOperation(seeGSM08.62).IftheBTSdoesnotsupportTFOorTFOisdisabled,thenthisfieldshallbesetto"0.0.0".Message_NoThisfieldisreservedfortheConfigurationProtocolincaseofTandemFreeOperation(seeGSM08.62).IftheBTSdoesnotsupportTFOorTFOisdisabled,thenthisfieldshallbesetto"0.0".DTXindownlinkrequested(DTXd)Seesubclause4.6.2.2.TFOEnabled(TFOE)ThisbitenablesordisablesTandemFreeOperationintheTRAU.IftheBTSdoesnotsupportTFOorTFOisdisabled,thenthisbitshallbesetto"0".Coding:TFOE==0:TFODisabled;TFOE==1:TFOEnabled.Frame_Classification:ThisfieldclassifiesthecontentsoftheTRAUframeasseenbytheradioreceiver,seeGSM06.93:C21.C22:11"Speech_Good"theframecanbedecodedwithoutrestriction10"Speech_Degraded"theframemightcontainundetectederrors01"Speech_Bad"theframecontainserrorsthatcannotbecorrected00"No_Speech"theframeisnotaspeechframe,seebelow.IntheuplinkdirectiontheFrame_Classificationisalsocalled"Rx_Type"andisalwayssetbytheBTS.InthedownlinkdirectiontheFrame_Classificationisalsocalled"Tx_Type".IfTandemFreeOperationisnotongoing,thenthecodes"Speech_Degraded",and"Speech_Bad"shallnotbeusedinthedownlinkdirection.IfTandemFreeOperationisongoing,thenallcodesmaybeusedinthedownlinkdirection.ForthehandlingwithinthedownlinkBTS,seeGSM08.62).SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)21(GSM08.60version7.2.1Release1998)Codec_Mode_Indication/Codec_Mode_Request:This3-bitfieldhasthreedifferentmeanings,dependingontheFrame_ClassificationfieldandtheRequest_or_Indication_Flag(RIF):IfFrame_Classificationisdifferentthan"0.0"thenthisfieldcontainseithertheCodec_Mode_Indication(CMI),ifRIFequals0;ortheCodec_Mode_Request(CMR),ifRIFequals1.IfFrame_Classificationisequalto"0.0",i.e.whenaNo_Speechframeistransmitted,thenthisfieldshallbesetto"0.0.0".CMIandCMRarethensimultaneouslytransmittedintheDataBits.Thecodingisidenticalinuplinkanddownlink.C23.C24.C25:000Codec_Mode4,75kBit/s001Codec_Mode5,15kBit/s010Codec_Mode5,90kBit/s011Codec_Mode6,70kBit/s100Codec_Mode7,40kBit/s101Codec_Mode7,95kBit/s110Codec_Mode10,2kBit/s111Codec_Mode12,2kBit/sTheCMIindicatestheCodec_Modetobeusedfordecodingtheassociatedspeechparametersinthesameandthenextframe.TheCMRindicatestheCodec_Modetobeusedforencodingintheoppositedirection.NOTE1:IntheTRAUframes,theCodec_Mode_Request,respectivelytheCodec_Mode_Indicationarecodedabsolutely(threebitsforeightpossiblemodes).Ontheradiointerface,becauseofbandwidthlimitation,theseparametersarecodedwithtwobitsonly.TheCCUshallperformtherequiredtranslation.NOTE2:IncaseofnoTandemFreeOperationtheuplinkCMRisaCodec_Mode_Command(CMC)fromtheBTStotheTRAUandtheTRAUshalltrytofollowthecommandassoonaspossible.TheonlyallowedexceptionisincaseofDTXwhenSIDorNo_Dataframescanbeusedduringspeechpauses.InthedownlinkdirectiontheCMRshallbesetbytheTRAUto"1.1.1".NOTE3:IncaseofanongoingTandemFreeOperation,thelocaluplinkCMRisanindicationfromthelocalBTStotheTRAU,respectivelytothedistantBTS,onthehighestallowedCodec_Modeinthelocaldownlinkdirection.ThisindicationmustbecombinedwiththecorrespondingCMRinthedistantuplinkdirectiontosettheCodecModetouseinthatdirection.ThelocaldownlinkCMRistheindicationfromthedistantradiolinkonthehighestallowedCodec_Modeinthedistantdownlinkdirection.ThisindicationmustbecombinedwiththecorrespondingCMRforthelocaluplinkdirection,seeGSM05.09and08.62.3.5.1.2.2CodingofDatabits(D-bits)InCodec_Mode10,2kBit/sthebitsD1…D20andD234…D253arereservedforTandemFreeOperationInallCodec_Modesbelow10,2kBit/sandinallNo_SpeechframesthebitsD1…D31(31bits)andD203…D256(54bits)arereservedforTandemFreeOperation(seeGSM08.62).InNo_SpeechframesadditionallybitsD44…D57(14bits)arereservedforTFOaswell.IftheBTSdoesnotsupportTFOorTFOisdisabled,thenthebitsinthesefieldsshallallbesetto"1".CodingofSpeechFrames:ThecontentsoftheDatabitsforalleightAMRCodec_Modesaredefinedinthefollowing,incaseswhentheFrame_ClassificationiseithersettoSpeech_Good,Speech_Degraded,orSpeech_Bad.Thespeechblockissubdividedintofoursubsets.Theorderwithinagivensubsetisthesameasoutputfromthetranscoder(seeGSM06.90).Thefourtimesthreeparitybits(CRC1toCRC4),addedattheendofeachsubset,aregeneratedusingthesamecycliccodeasdefinedfortheEnhancedFullRate(seesubclause3.5.1.1.2).TheTRAUframeformatsinuplinkanddownlinkdirectionareidentical.AMR_Mode12,2kBit/s,seeGSM06.90:D1.D38:IndexesoftheLSFsubmatrices(s1…s38)D39.D91:Indexesoftheparametersoffirstsub-frame(s39…s91)D92.D94:CRC1overbitsC1…C25,s1…s29,s39…s50,s87…s89.D95.D144:Indexesoftheparametersofsecondsub-frame(s92…s141)D145.D147:CRC2overbitss92…s100,s137…s139.D148.D200:Indexesoftheparametersofthirdsub-frame(s142…s194)D201.D203:CRC3overbitss142…s153,s190…s192.D204.D253:Indexesoftheparametersoffourthsub-frame(s195….s244)D254.D256:CRC4overbitss195…s199,s201…s203,s240…s242.SIST EN 300 737 V7.2.1:2003
ETSIETSIEN300737V7.2.1(2000-09)22(GSM08.60version7.2.1Release1998)AMR_Mode10,2kBit/s,seeGSM06.90:D21.D46:IndexesoftheLSFsubmatrices(s1.s26)D47.D92:Indexesoftheparametersoffirstsub-frame(s27.s72)D93.D95:CRC1overbitsC1.C25,D1.D20,s1.s25,s27.s34,s66,s67,s69,s70.D96.D138:Indexesoftheparametersofsecondsub-frame(s73.s115)D139.D141:CRC2overbitss73.s76,s109,s110,s112,s113.D142.D187:Indexesoftheparametersofthirdsub-frame(s116.s161)D188.D190:CRC3overbitss116.s123,s155,s156,s158,s159.D191.D233:Indexesoftheparametersoffourthsub-frame(s162.s204)D254.D256:CRC4overbitss162.s165,s198,s199,s201,s202,D234.D253.AMR_Mode7,95kBit/s,seeGSM06.90:D32.D58:IndexesoftheLSFsubmatrices(s1.s27)D59.D92:Indexesoftheparametersoffirstsub-frame(s28.s61)D93.D95:CRC1overbitsC1.C25,s1.s35,s53,s54,s57,s60.D96.D127:Indexesoftheparametersofsecondsub-frame(s62.s93)D128.D130:CRC2overbitss62.s65,s85,s86,s89.s92.D131.D164:Indexesoftheparametersofthirdsub-frame(s94.s127)D165.D167:CRC3overbitss94.s101,s119,s120,s123.s126.D168.D199:Indexesoftheparametersoffourthsub-frame(s128.s159)D200.D202:CRC4overbitss128.s131,s151,s152,s155.s158.AMR_Mode7,40kBit/s,seeGSM06.90:D32…34spare(3bits);setto"1"D35.D60:IndexesoftheLSFsubmatrices(s1.s26)D61.D92:Indexesoftheparametersoffirstsub-frame(s27.s58)D93.D95:CRC1:bitsC1.C25,s1.s20,s22.s24,s27.s32,s52,s53,s55.s57.D96.D124:Indexesoftheparametersofsecondsub-frame(s59.s87)D125.D127:CRC2overbitss59.s61,s81,s82,s84.s86.D128.D159:Indexesoftheparametersofthirdsub-frame(s88.s119)D160.D162:CRC3overbitss88.s93,s113,s114,s116.s118.D163.D191:Indexesoftheparametersoffourthsub-frame(s120.s148)D192.D194:CRC4overbitss120.s122,s142,s143,s145,s146.D195.D202:spare(8bits);setto"1".AMR_Mode6,70kBit/s,seeGSM06.90:D32…D37:spare(6bits);setto"1"D38.D63:IndexesoftheLSFsubmatrices(s1.s26)D64.D92:Indexesoftheparametersoffirstsub-frame(s27.s55)D93.D95:CRC1overbitsC1.C25,s1.s17,s20,s24,s27.s34,s49.s53.D96.D120:Indexesoftheparametersofsecondsub-frame(s56.s80)D121.D123:CRC2overbitss56.s59,s74.s78.D124.D152:Indexesoftheparametersofthirdsub-frame(s81.s109)D153.D155:CRC3overbitss81.s88,s103.s107.D156.D180:Indexesoftheparametersoffourthsub-frame(s110.s134)D181.D183:CRC4overbitss110.s113,s128.s132.D184.D202:spare(19bits);setto"1".AMR_Mode5,90kBit/s,seeGSM06.90:D32…D41:spare(10bits);setto"1"D42.D67:IndexesoftheLSFsubmatrices(s1.s26)D68.D92:Indexesoftheparametersoffirstsub-frame(s27.s51)D93.D95:CRC1overbitsC1.C25,s1.s17,s27.s34,s48.s51.D96.D116:Indexesoftheparametersofsecondsub-frame(s52.s72)D117.D119:CRC2overbitss52.s54,s69.s72.D120.D144:Indexesoftheparametersofthirdsub-frame(s73.s97)D145.D147:CRC3overbitss73.s80,s94.s97.D148.D168:Indexesoftheparametersof
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