ETSI EN 300 979 V7.2.2 (2000-06)

Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for half rate traffic channels (GSM 08.61 version 7.2.2 Release 1998)

REN/SMG-020861Q7R1

Digitalni celični telekomunikacijski sistem (faza 2+) – Znotrajpasovno krmiljenje oddaljenih prekodirnikov in prilagodilnikov hitrosti pri prometnih kanalih s polovično hitrostjo govora (GSM 08.61, različica 7.2.2, izdaja 1998)

General Information

• Status: Published
• Publication Date: 16-Jul-2000
• Technical Committee: SMG 2 - Radio
• Current Stage: 12 - Completion
• Due Date: 19-May-2000
• Completion Date: 17-Jul-2000
• Ref Project: SIST EN 300 979 V7.2.2:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); In-band control of remote transcoders and rate adaptors for half rate traffic channels (GSM 08.61 version 7.2.2 Release 1998)

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 half rate traffic channels (GSM 08.61 version 7.2.2 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 979 Version 7.2.2SIST EN 300 979 V7.2.2:2003en01-december-2003SIST EN 300 979 V7.2.2:2003SLOVENSKI
STANDARD



SIST EN 300 979 V7.2.2:2003



ETSIEN300979V7.2.2(2000-06)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);In-bandcontrolofremotetranscodersandrateadaptorsforhalfratetrafficchannels(GSM08.61version7.2.2Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)2(GSM08.61version7.2.2Release1998)ReferenceREN/SMG-020861Q7R1KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-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 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)3(GSM08.61version7.2.2Release1998)ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.74Generalapproach.85Framestructure.105.116kbit/ssubmultiplexing.105.1.1FramesforSpeechServices.105.1.1.1FrameforHalfRatespeech.105.1.1.2FramesforAdaptiveMulti-RateSpeech.105.1.2Dataframe.115.1.3O&Mframe.125.1.4Coding.125.1.4.1Codingofframesforspeechservices.135.1.4.1.1CodingofframesforHalfRatespeechControlbits(C-bits):.135.1.4.1.2CodingofframesforAdaptiveMulti-Ratespeech.145.1.4.2Codingofdataframes.145.1.4.3CodingofO&Mframes.155.1.5OrderofBitTransmission.155.28kbit/ssubmultiplexing.165.2.1FramesforSpeechServices.165.2.1.1FrameforHalfRateSpeech.165.2.1.2FramesforAdaptiveMulti-RateSpeech.165.2.1.2.1FrameforLowerCodecModes.165.2.1.2.2SpeechframeforCodecMode6,70kBit/s.175.2.1.2.3SpeechframeforCodecMode7,40kBit/s.175.2.1.2.4SpeechframeforCodecMode7,95kBit/s.175.2.2Dataframe.185.2.3O&Mframe.185.2.4Coding.185.2.4.1CodingforHalfRateSpeechandHalfRateDataServices.185.2.4.1.1Uplinkcoding.195.2.4.1.2Downlinkcoding.215.2.4.2CodingforAdaptiveMulti-RateSpeech.225.2.4.2.1No_SpeechFrame.225.2.4.2.2SpeechFramesfor4,75,5,15and5,90kBit/s.245.2.4.2.3SpeechFramefor6,70kBit/s.255.2.4.2.4SpeechFramefor7,40kBit/s.265.2.4.2.5SpeechFramefor7,95kBit/s.265.2.5OrderofBitTransmission.266Procedures.266.1RemoteControlofTranscodersandRateAdaptors.266.2ResourceAllocation.276.3ResourceRelease.276.4InCallModification.276.5TransferofIdleFrames,Handlingofmissingdata.276.6ProceduresforSpeechFrames.286.6.1TimeAlignmentofSpeechFrames.286.6.1.116kbit/ssubmultiplexing.286.6.1.1.1DownlinkTimeAlignment.28SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)4(GSM08.61version7.2.2Release1998)6.6.1.1.2UplinkTimeAlignment.316.6.1.1.3InitiationatResourceAllocation.316.6.1.1.4TimeAlignmentduringHandover.316.6.1.28kbit/ssubmultiplexing.316.6.1.2.1DownlinkTimeAlignment.316.6.1.2.2UplinkTimeAlignment.336.6.1.2.3InitiationatResourceallocation.346.6.1.2.4TimeAlignmentduringhandover.346.6.2ProceduresforDiscontinuousTransmission(DTX).346.6.2.1DTXproceduresintheuplinkdirection.346.6.2.2DTXproceduresinthedownlinkdirection.356.7ProceduresforDataFrames.356.7.1TheRAAFunction.356.7.2TheRA1/RA1'Function.366.7.3TheRA2Function.366.7.4Proceduresfor8kbit/sintermediaterateadaptionrate.366.7.5SupportofNon-TransparentBearerApplications.376.8FrameSynchronization.376.8.116kbit/ssubmultiplexing.376.8.1.1SearchforFrameSynchronization.376.8.1.2FrameSynchronizationAfterPerformingDownlinkTimingAdjustments.376.8.1.3FrameSynchronizationMonitoringandRecovery.376.8.28kbit/ssubmultiplexing.386.8.2.1SearchforFrameSynchronization.386.8.2.1.1ForHalfRatespeechanddata.386.8.2.1.2ForAdaptiveMulti-Ratespeech.386.8.2.2FrameSynchronizationMonitoringandRecovery.386.8.2.2.1ForHalfRatespeechanddata.386.8.2.2.2ForAdaptiveMulti-Ratespeech.396.9Correction/detectionofbiterrors.396.9.116kbit/ssubmultiplexing.396.9.1.1ErrorDetectionontheControlBits.396.9.1.1.1GeneralProcedure.396.9.1.1.2FramesforHalfRatespeech.396.9.1.2HandlingofframesreceivedwitherrorsforHalfRatespeechanddata.406.9.28kbit/ssubmultiplexing.406.9.2.1ErrorDetectionontheControlBits.406.9.2.2Handlingofframesreceivedwitherrors.406.10ProceduresforOperation&Maintenance.406.10.1TransferofO&MInformationBetweentheTRAUandtheBSC.416.10.2ProceduresintheTRAU.416.10.3ProceduresintheBSC.416.10.3.1UseofO&MFrames.416.10.4ProceduresintheBTS.41AnnexA(informative):ChangeRequestHistory.43History.44SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)5(GSM08.61version7.2.2Release1998)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)hasbeenproducedbytheSpecialMobileGroup(SMG).ThepresentdocumentdefinestheprotocolbetweentheBaseTransceiverStation(BTS)andtheremoteTranscoder/RateAdaptionUnit(TRAU)forhalfratespeech,AdaptiveMulti-Ratespeechandhalfratedata,withinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:12May2000DateoflatestannouncementofthisEN(doa):31August2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2001DateofwithdrawalofanyconflictingNationalStandard(dow):28February2001SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)6(GSM08.61version7.2.2Release1998)1ScopeThepresentdocumentdescribestheprotocolbetweentheBaseTransceiverStation(BTS)andtheremoteTranscoder/RateAdaptionUnit(TRAU)forspeechanddataonhalfratetrafficchannel(TCH/H).ForHalfRatespeechandhalfratedatatheprotocolisspecifiedfor8kbit/sand16kbit/ssubmultiplexingscheme.ForAdaptiveMulti-Ratespeechthepresentdocumentspecifiesthe8kBit/ssubmultiplexing,bothforthefullandthehalfratetrafficchannels(TCH/AFSandTCH/AHS).Thespecificationfor16kBit/ssubmultiplexingisgiveninRecGSM08.60,bothforthefullandthehalfratetrafficchannels(TCH/AFSandTCH/AHS).ThepresentdocumentshouldbeconsideredtogetherwiththeGSM06series,GSM04.21(RateAdaptionontheMS-BSSInterface)andGSM08.20(RateAdaptionontheBTS/MSCInterface).2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.x.y).[1]GSM01.02:"Digitalcellulartelecommunicationsystem(Phase2+);GeneraldescriptionofaGSMPublicLandMobileNetwork(PLMN)".[2]GSM01.04:"Digitalcellulartelecommunicationsystem(Phase2+);Abbreviationsandacronyms".[3]GSM04.21:"Digitalcellulartelecommunicationssystem(Phase2+);RateadaptionontheMobileStation-BaseStationSystem(MS-BSS)interface".[4]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[5]GSM06.21:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels".[6]GSM06.22:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".[7]GSM06.41:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".[8]GSM06.42:"Digitalcellulartelecommunicationssystem(Phase2+);"Halfratespeech;VoiceActivityDetector(VAD)forhalfratespeechtrafficchannels".[9]GSM08.08:"Digitalcellulartelecommunicationsystem(Phase2+);MobileSwitchingCentre-BaseStationSystem(MSC-BSS)interfaceLayer3specification".[10]GSM08.20:"Digitalcellulartelecommunicationsystem(Phase2+);RateadaptionontheBaseStationSystem-Mobile-servicesSwitchingCentre(BSS-MSC)interface".[11]GSM08.52:"Digitalcellulartelecommunicationsystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interfaceInterfaceprinciples".SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)7(GSM08.61version7.2.2Release1998)[12]GSM08.54:"Digitalcellulartelecommunicationsystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interfaceLayer1structureofphysicalcircuits".[13]GSM08.58:"Digitalcellulartelecommunicationsystem(Phase2+);BaseStationController-BaseTransceiverStation(BSC-BTS)interfaceLayer3specification".[14]GSM12.21:"Digitalcellulartelecommunicationsystem(Phase2);NetworkManagement(NM)proceduresandmessagesontheA-bisinterface".[15]ITU-TRecommendationI.460:"Multiplexing,rateadaptionandsupportofexistinginterfaces".[16]ITU-TRecommendationV.110:"Supportofdataterminalequipments(DTEs)withV-Seriesinterfacesbyanintegratedservicesdigitalnetwork".[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]GSM08.60:"Digitalcellulartelecommunicationssystem;In-bandcontrolofremotetranscodersandrateadaptorsforfullratetrafficchannels".[32]GSM08.62:"Digitalcellulartelecommunicationssystem;InbandTandemFreeOperation(TFO)ofSpeechCodecs".3Definitionsandabbreviations3.1DefinitionsNospecificdefinitionsapplytothepresentdocument.3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BSCBaseStationControllerBTSBaseTransceiverStationCCUChannelCodecUnitRARateAdaptionTRAUTranscoderandRateAdaptionUnitACSActive_Codec_SetAMRAdaptiveMulti-RateCMCCodec_Mode_CommandCMICodec_Mode_IndicationCMRCodec_Mode_RequestDFEDownlinkFrameErrorSIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)8(GSM08.61version7.2.2Release1998)ICMInitial_Codec_ModePABPhaseAlignmentBitPACPhaseAlignmentCommandRIFRequestorIndicationFlagTACTimeAlignmentCommandTAETimeAlignmentExtensionTFOTandemFreeOperationTFOETFOEnableUFEUplinkFrameErrorOtherabbreviationsusedinthepresentdocumentarelistedinGSM01.04.4GeneralapproachTheTRAUshallbecontrolledbytheBTSwhenitispositionedremotefromtheBTS.Inthiscase,thespeech/datainformationandTRAUcontrolsignalsexchangedbetweentheChannelCodecUnit(CCU)intheBTSandtheTRAUshallbetransferredinframesdenoted"TRAUframes".TheTRAUframesmaybecarriedbyeither16kbit/strafficchannelsor8kbit/schannels.Thechoiceofthetrafficchannelbitrateorsubmultiplexingschemeisoperatordependent.TheTRAUframeshaveafixedlengthof:-160bits(20ms)when8kbit/ssubmultiplexingisused;-320bits(20ms)when16kbit/ssubmultiplexingisused.TheprotocolbetweentheBTSandtheTRAUshouldbethesameiftheTRAUispositionedeitherattheMSCsiteorattheBSCsite.Inthefirstcase,theBSCshouldbeconsideredastransparentfor16kbit/sand8kbit/schannels.TheTRAUisconsideredapartoftheBSCwhentheTRAUisremotefromtheBTS(seeGSM08.52),andthesignallingbetweentheBSCandtheTRAU(e.g.detectionofcallrelease,handoverandtransferofO&Minformation)maybeperformedbyusingBSCinternalsignals.However,thesignallingbetweentheCCUandtheTRAU,usingTRAUframesasspecifiedinthepresentdocument,ismandatorywhentheTRAUisremotefromtheBTS.Fordatatransfer,aconversionfunctionisrequired,inadditiontotheconversion/rateadaptionspecifiedinGSM08.20,toadaptITU-TV.110framestotheTRAUdataframes.ThisfunctionconstitutestheRAA.NOTE:Ifstandard64kbit/sswitchingisusedintheBSC,multiplexingaccordingtoITU-TRecommendationI.460shouldapplyatbothsidesoftheswitch.ApossibleconfigurationoftheTRAUandtheCCUisshowninfigure4.1.ThefunctionsinsidetheTRAUare:-"RemoteTranscoderandRateAdaptorControlFunction"(RTRACF);-"RemoteSpeechHandlerFunction"(RSHF);-theRAAfunction;-theRA2function;-thetranscoderfunction.ThefunctionsinsidetheCCUare:-"TranscoderandRateAdaptorControlFunction"(TRACF);-"SpeechHandlerFunction"(SHF);-theRAAfunction;SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)9(GSM08.61version7.2.2Release1998)-theRA1/RA1'function;-thechannelcodecfunction.ThepresentdocumentdoesnotdescribetheproceduresinsidetheTRAUandtheCCU.Thelayoutinfigure4.1isonlyintendedasareferencemodel.TranscoderandRAControlFunctionRemoteTranscoderandRAControlFunctionRAARA2RA1RA1'ChannelCodecFunctionDataControlSpeech/DataRemoteSpeechHandlerFunctionRadioframesSpeech64kbit/s8kbit/s16kbit/s320bit/20ms160bit/20msSpeechHandlerFunctionTranscoderFunction(note)L3controlsignalsRAADataSpeechNOTE:ThistechnicalspecificationassumestheDTXhandlerfunctiontobepartoftheTranscoderFunction.FigureGSM08.61/4.1:FunctionalentitiesforhandlingofcontrolofremotetranscodersandrateadaptorsSIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)10(GSM08.61version7.2.2Release1998)5Framestructure5.116kbit/ssubmultiplexing5.1.1FramesforSpeechServices5.1.1.1FrameforHalfRatespeechBitnumberOctetno.1234567810000000020000000031C1C2C3C4C5C6C74C8C9C10C11C12C13C14C1551UFID1D2D3D4D5D66D7D8D9D10D11D12D13D1471D15D16D17D18D19D20D218D22D23D24D25D26D27D28D2991D30D31D32D33D34D35D3610D37D38D39D40D41D42D43D44111CRC2CRC1CRC0D45D46D47D4812D49D50D51D52D53D54D55D56131D57D58D59D60D61D62D6314D64D65D66D67D68D69D70D71151D72D73D74D75D76D77D7816D79D80D81D82D83D84D85D86171D87D88D89D90D91D92D9318D94D95D96D97D98D99D100D101191D102D103D104D105D106D107D10820D109D110D111D112111121111111112211111111231111111124111111112511111111261111111127111111112811111111291111111130111111113111111111321111111133111111113411111111351111111136111111113711111111381111111139111111C16C1740C18C19C20C21T1T2T3T45.1.1.2FramesforAdaptiveMulti-RateSpeechSeeGSM08.60for16kBit/ssubmultiplexing.SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)11(GSM08.61version7.2.2Release1998)5.1.2DataframeBitnumberOctetno.123456781000000002000000031C1C2C3C4C5C6C74C8C9C10C11C12C13C14C1551D1D2D3D4D5D6D761D8D9D10D11D12D13D1471D15D16D17D18D19D20D2181D22D23D24D25D26D27D28Dataframe91D29D30D31D32D33D34D35position1101D36D37D38D39D40D41D42111D43D44D45D46D47D48D49121D50D51D52D53D54D55D56131D57D58D59D60D61D62D63141111111115111111111611111111171111111118111111111911111111201111111121111111112211111111231D'1D'2D'3D'4D'5D'6D'7241D'8D'9D'10D'11D'12D'13D'14251D'15D'16D'17D'18D'19D'20D'21261D'22D'23D'24D'25D'26D'27D'28Dataframe271D'29D'30D'31D'32D'33D'34D'35position3281D'36D'37D'38D'39D'40D'41D'42291D'43D'44D'45D'46D'47D'48D'49301D'50D'51D'52D'53D'54D'55D'56311D'57D'58D'59D'60D'61D'62D'63321111111133111111113411111111351111111136111111113711111111381111111139111111114011111111SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)12(GSM08.61version7.2.2Release1998)5.1.3O&MframeBitnumberOctetno.1234567810000000020000000031C1C2C3C4C5C6C74C8C9C10C11C12C13C14C1551D1D2D3D4D5D6D76D8D9D10D11D12D13D14D1571D16D17D18D19D20D21D228D23D24D25D26D27D28D29D3091D31D32D33D34D35D36D3710D38D39D40D41D42D43D44D45111D46D47D48D49D50D51D5212D53D54D55D56D57D58D59D60131D61D62D63D64D65D66D6714D68D69D70D71D72D73D74D75151D76D77D78D79D80D81D8216D83D84D85D86D87D88D89D90171D91D92D93D94D95D96D9718D98D99D100D101D102D103D104D105191D106D107D108D109D110D111D11220D113D114D115D116D117D118D119D120211D121D122D123D124D125D126D12722D128D129D130D131D132D133D134D135231D136D137D138D139D140D141D14224D143D144D145D146D147D148D149D150251D151D152D153D154D155D156D15726D158D159D160D161D162D163D164D165271D166D167D168D169D170D171D17228D173D174D175D176D177D178D179D180291D181D182D183D184D185D186D18730D188D189D190D191D192D193D194D195311D196D197D198D199D200D201D20232D203D204D205D206D207D208D209D210331D211D212D213D214D215D216D21734D218D219D220D221D222D223D224D225351D226D227D228D229D230D231D23236D233D234D235D236D237D238D239D240371D241D242D243D244D245D246D24738D248D249D250D251D252D253D254D255391D256D257D258D259D260D261D26240D263D264S1S2S3S4S5S65.1.4CodingInthefollowingsections,thecodingoftheframesisdescribed.Anyspareornotusedcontrolbitsshouldbecodedbinary"1".SIST EN 300 979 V7.2.2:2003



ETSIETSIEN300979V7.2.2(2000-06)13(GSM08.61version7.2.2Release1998)5.1.4.1Codingofframesforspeechservices5.1.4.1.1CodingofframesforHalfRatespeechControlbits(C-bits):DescriptionUplinkDownlinkFrametype(BitsC1-C4)C1C2C3C40001C1C2C3C41110ChanneltypeBitC51:halfrate1:halfrateTimeAlignment(BitsC6-C11)Binarynumberindicatingtherequiredtimingadjustmenttobeinstepsof250/500µs.Binarynumberindicatingthetimingadjustmentmade.ThefollowingvaluesapplyforthecodingC6C7.C11000000Nochangeinframetiming00000
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