ETSI EN 301 705 V7.1.1 (2000-05)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Substitution and muting of lost frames for Adaptive Multi Rate (AMR) speech traffic channels (GSM 06.91 version 7.1.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 301 705 Version 7.1.1SIST EN 301 705 V7.1.1:2003en01-december-2003SIST EN 301 705 V7.1.1:2003SLOVENSKI
STANDARD



SIST EN 301 705 V7.1.1:2003



ETSIEN301705V7.1.1(2000-04)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframesforAdaptiveMultiRate(AMR)speechtrafficchannels(GSM06.91version7.1.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 301 705 V7.1.1:2003



ETSIETSIEN301705V7.1.1(2000-04)2(GSM06.91version7.1.1Release1998)ReferenceREN/SMG-110691Q7R1KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM),AMRETSI650RoutedesLuciolesF-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 301 705 V7.1.1:2003



ETSIETSIEN301705V7.1.1(2000-04)3(GSM06.91version7.1.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitionsandabbreviations.53.1Definitions.53.2Abbreviations.64General.65Requirements.65.1Errordetection.65.2Lostspeechframes.65.3FirstlostSIDframe.65.4SubsequentlostSIDframes.76ExampleECU/BFHSolution1.76.1StateMachine.76.2AssumedActiveSpeechFrameErrorConcealmentUnitActions.86.2.1BFI=0,prevBFI=0,State=0.86.2.2BFI=0,prevBFI=1,State=0or5.86.2.3BFI=1,prevBFI=0or1,State=1.6.96.2.3.1LTP-lagupdate.96.2.3.2Innovationsequence.96.3AssumedNon-ActiveSpeechSignalErrorConcealmentUnitActions.106.3.1General.106.3.2Detectors.106.3.2.1Backgrounddetector.106.3.2.2Voicingdetector.106.3.3BackgroundECUActions.106.4SubstitutionandmutingoflostSIDframes.107ExampleECU/BFHSolution2.117.1StateMachine.117.2Substitutionandmutingoflostspeechframes.117.2.1BFI=0,prevBFI=0,State=0.117.2.2BFI=0,prevBFI=1,State=0or5.117.2.3BFI=1,prevBFI=0or1,State=1.6.127.2.3.1LTP-lagupdate.127.2.4Innovationsequence.127.3SubstitutionandmutingoflostSIDframes.12AnnexA(informative):Documentchangehistory.13History.14SIST EN 301 705 V7.1.1:2003



ETSIETSIEN301705V7.1.1(2000-04)4(GSM06.91version7.1.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbytheSpecialMobileGroup(SMG).ThepresentdocumentintroducestheAdaptiveMulti-Rate(AMR)speechtrafficchannelswithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:31March2000DateoflatestannouncementofthisEN(doa):30June2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31December2000DateofwithdrawalofanyconflictingNationalStandard(dow):31December2000SIST EN 301 705 V7.1.1:2003



ETSIETSIEN301705V7.1.1(2000-04)5(GSM06.91version7.1.1Release1998)1ScopeThepresentdocumentdefinesaframesubstitutionandmutingprocedurewhichshallbeusedbytheReceive(RX)DiscontinuousTransmission(DTX)handlerwhenoneormorelostspeechorSilenceDescriptor(SID)framesarereceivedfromtheRadioSubSystem(RSS).TherequirementsofthepresentdocumentaremandatoryforimplementationinallGSMBaseStationSystems(BSS)sandMobileStations(MS)scapableofsupportingtheAMRspeechtrafficchannel.ItisnotmandatorytofollowthebitexactimplementationoutlinedinthepresentdocumentandthecorrespondingCsourcecode.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.x.y).[1]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[2]GSM06.90:"Digitalcellulartelecommunicationssystem(Phase2+);AMRspeechtranscoding".[3]GSM06.93:"Digitalcellulartelecommunicationssystem(Phase2+);Discontinuoustransmission(DTX)forAdaptiveMultiRate(AMR)speechtrafficchannels".[4]GSM08.60:"Digitalcellulartelecommunicationssystem(Phase2+);InbandcontrolofremotetranscodersandrateadaptorsforAMR,EnhancedFullRate(EFR)andFullRatetrafficchannels".[5]GSM08.61:"Digitalcellulartelecommunicationssystem(Phase2+);InbandcontrolofremotetranscodersandrateadaptorsforHalfRatetrafficchannels".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply.N-pointmedianoperation:ConsistsofsortingtheNelementsbelongingtothesetforwhichthemedianoperationistobeperformedinanascendingorderaccordingtotheirvalues,andselectingthe(int(N/2)+1)-thelargestvalueofthesortedsetasthemedianvalue.FurtherdefinitionsoftermsusedinthepresentdocumentcanbefoundinGSM06.90[2],GSM06.93[3],GSM05.03[1]andGSM08.60[4].SIST EN 301 705 V7.1.1:2003



ETSIETSIEN301705V7.1.1(2000-04)6(GSM06.91version7.1.1Release1998)3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BFIBadFrameIndicationfromRadioSubSystemBSI_AbisBadSub-blockIndicationobtainedfromA-bisCRCchecksprevBFIBadFrameIndicationofpreviousframePDFIPotentiallyDegradedFrameIndicationfromRSSRSSRadioSubSystemRXReceiveDTXDiscontinuousTransmissionSIDSIlenceDescriptorframe(Backgrounddescriptor)CRCCyclicRedundancyCheckCCUChannelCodingUnitECUErrorConcealmentUnitBFHBadFrameHandlingmedianNN-pointmedianoperationTRAUTranscodingRateAdaptationUnit4GeneralThepurposeofframesubstitutionistoconcealtheeffectoflostframes.Thepurposeofmutingtheoutputinthecaseofseverallostframesistoindicatethebreakdownofthechanneltotheuserandtoavoidgeneratingpossibleannoyingsoundsasaresultfr
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