SIST EN 301 243 V4.1.1:2003
(Main)Digital cellular telecommunications system (Phase 2) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 4.1.1)
General Information
- Abstract
CRs from SMG#32
- 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
- Mandate
- T-172
Overview
SIST EN 301 243 V4.1.1:2003 establishes the general description of Enhanced Full Rate (EFR) speech processing functions for the digital cellular telecommunications system (Phase 2) based on the Global System for Mobile Communication (GSM). This standard, aligned with GSM 06.51 version 4.1.1 and adopted by the Slovenski inštitut za standardizacijo (SIST), provides a comprehensive framework for EFR speech traffic channels, ensuring efficient and high-quality speech transmission over GSM networks.
Developed within the European Telecommunications Standards Institute (ETSI) technical committee framework, this document outlines the structure, key processing algorithms, and interoperability arrangements for EFR in GSM networks. The standard supports improved speech quality and service reliability, vital for both network operators and equipment manufacturers.
Key Topics
Enhanced Full Rate (EFR) speech transcoding: Describes the function and mapping between Pulse Code Modulated (PCM) signals and encoded EFR blocks, supporting intelligible and natural speech during transmission.
Discontinuous Transmission (DTX): Details the mechanism for reducing transmitter use during silent periods, conserving mobile station battery life and reducing interference across the radio spectrum.
Voice Activity Detection (VAD): Explains algorithms used to determine speech presence on a frame-by-frame basis, enabling DTX operations and efficient resource usage.
Comfort Noise Insertion: Provides guidance for artificial noise generation during silent transmission periods to maintain audio continuity and user comfort.
Lost Speech Frame Substitution and Muting: Outlines procedures for handling lost frames due to transmission errors, including muting and predictive substitution to maintain audio experience.
Codec Homing: Ensures modules return to a predefined state for verification, interoperability testing, and type approval.
Alternative EFR Implementations: Allows the use of the Adaptive Multi-Rate (AMR) codec operating at 12.2 kbit/s as a functionally equivalent alternative to classic EFR.
Applications
This standard is crucial for various stakeholders within the GSM ecosystem:
Mobile Network Operators: Ensures robust and high-quality speech transmission, reducing dropped calls and user complaints related to voice quality.
Device Manufacturers: Provides a reference for implementing compatible EFR speech codecs, ensuring that new GSM handsets and infrastructure equipment meet interoperability and performance benchmarks.
Testing and Certification Bodies: Facilitates consistent evaluation and approval through defined bit-exact test sequences and homing functions, supporting reliable equipment deployment.
Infrastructure Vendors: Enables effective integration of speech processing functions in base stations and network elements, contributing to seamless operation with different generations of equipment.
Research and Development: Offers a foundational specification for further innovation in speech coding, noise reduction, and error resilience for evolving mobile networks.
Related Standards
For a comprehensive understanding and interoperability, SIST EN 301 243 V4.1.1 references and complements several related GSM standards, including:
- GSM 06.60 (EN 301 245): Enhanced Full Rate speech transcoding
- GSM 06.61 (EN 301 246): Lost frame substitution and muting for EFR channels
- GSM 06.62 (EN 301 247): Comfort noise aspects for EFR channels
- GSM 06.81 (EN 301 248): Discontinuous Transmission (DTX) for EFR channels
- GSM 06.82 (EN 301 249): Voice Activity Detector (VAD) for EFR channels
- GSM 06.53 (EN 301 244): ANSI-C code of the GSM EFR speech codec
- GSM 06.54 (EN 301 250): Test vectors for the GSM EFR speech codec
Keywords: GSM, EFR, speech processing, mobile communication, digital cellular, comfort noise, DTX, VAD, codec homing, interoperability, speech codec standard, SIST, ETSI, telecommunications.
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Frequently Asked Questions
SIST EN 301 243 V4.1.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 4.1.1)". This standard covers: CRs from SMG#32
CRs from SMG#32
SIST EN 301 243 V4.1.1:2003 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 301 243 V4.1.1:2003 is associated with the following European legislation: Standardization Mandates: T-172. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 301 243 V4.1.1:2003 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); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 4.1.1)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 301 243 Version 4.1.1SIST EN 301 243 V4.1.1:2003en01-december-2003SIST EN 301 243 V4.1.1:2003SLOVENSKI
STANDARD
ETSIEN301243V4.1.1(2000-11)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2);EnhancedFullRate(EFR)speechprocessingfunctions;Generaldescription(GSM06.51version4.1.1)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 301 243 V4.1.1:2003
ETSIETSIEN301243V4.1.1(2000-11)2(GSM06.51version4.1.1)ReferenceREN/SMG-110651PR1KeywordsEFR,digitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM),speechETSI650RoutedesLuciolesF-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 301 243 V4.1.1:2003
ETSIETSIEN301243V4.1.1(2000-11)3(GSM06.51version4.1.1)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitionsandabbreviations.53.1Definitions.53.2Abbreviations.64General.65EnhancedFullRatespeechchanneltranscoding.86EnhancedFullRatespeechchanneldiscontinuoustransmission(DTX).87EnhancedFullRatespeechchannelVoiceActivityDetection(VAD).88EnhancedFullRatespeechchannelcomfortnoiseinsertion.99EnhancedFullRatespeechchannellostspeechframesubstitutionandmuting.910EnhancedFullRatecodechoming.911AlternativeEnhancedFullRateimplementationusingtheAdaptiveMultiRate12.2kbit/smode.10AnnexA(informative):ChangeRequestHistory.11History.12SIST EN 301 243 V4.1.1:2003
ETSIETSIEN301243V4.1.1(2000-11)4(GSM06.51version4.1.1)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).ThepresentdocumentintroducestheEnhancedFullRate(EFR)speechtrafficchannelswithinthedigitalcellulartelecommunicationssystem.ThepresentdocumentcorrespondstoGSMtechnicalspecification,GSM06.51,version4.0.1.NationaltranspositiondatesDateofadoptionofthisEN:24November2000DateoflatestannouncementofthisEN(doa):28February2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2001DateofwithdrawalofanyconflictingNationalStandard(dow):31August2001SIST EN 301 243 V4.1.1:2003
ETSIETSIEN301243V4.1.1(2000-11)5(GSM06.51version4.1.1)1ScopeThepresentdocumentisanintroductiontoGSM06.60(EN301245)[6],GSM06.61(EN301246)[7],GSM06.62(EN301247)[8],GSM06.81(EN301248)[9]andGSM06.82(EN301249)[10]ENsdealingwiththespeechprocessingfunctionsintheEnhancedFullRatechanneloftheGSMsystem.Ageneraloverviewofthespeechprocessingfunctionsisgiven,withreferencetotheENswhereeachfunctionisspecifiedindetail.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]GSM01.04(ETR100):"Digitalcellulartelecommunicationssystem(Phase2);Abbreviationsandacronyms".[2]GSM03.50(ETS300540):"Digitalcellulartelecommunicationssystem(Phase2);TransmissionplanningaspectsofthespeechserviceintheGSMPublicLandMobileNetwork(PLMN)system".[3]GSM05.03(ETS300575):"Digitalcellulartelecommunicationssystem(Phase2);Channelcoding".[4]GSM06.53(EN301244):"Digitalcellulartelecommunicationssystem(Phase2);ANSI-CcodefortheGSMEnhancedFullRate(EFR)speechcodec".[5]GSM06.54(EN301250):"Digitalcellulartelecommunicationssystem(Phase2);TestvectorsfortheGSMEnhancedFullRate(EFR)speechcodec".[6]GSM06.60(EN301245):"Digitalcellulartelecommunicationssystem(Phase2);EnhancedFullRate(EFR)speechtranscoding".[7]GSM06.61(EN301246):"Digitalcellulartelecommunicationssystem(Phase2);SubstitutionandmutingoflostframeforEnhancedFullRate(EFR)speechtrafficchannels".[8]GSM06.62(EN301247):"Digitalcellulartelecommunicationssystem(Phase2);ComfortnoiseaspectsforEnhancedFullRate(EFR)speechtrafficchannels".[9]GSM06.81(EN301248):"Digitalcellulartelecommunicationssystem(Phase2);Discontinuoustransmission(DTX)forEnhancedFullRate(EFR)speechtrafficchannels".[10]GSM06.82(EN301249):"Digitalcellulartelecommunicationssystem(Phase2);VoiceActivityDetector(VAD)forEnhancedFullRate(EFR)speechtrafficchannels".3Definitionsandabbreviations3.1DefinitionsDefinitionoftermsusedinthepresentdocumentcanbefoundinGSM06.60(EN301245)[6],GSM06.61(EN301246)[7],GSM06.62(EN301247)[8],GSM06.81(EN301248)[9]andGSM06.82(EN301249)[10].SIST EN 301 243 V4.1.1:2003
ETSIETSIEN301243V4.1.1(2000-11)6(GSM06.51version4.1.1)3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ACELPAlgebraicCodeExcitedLinearPredictionBFIBadFrameIndicationBSSBaseStationSystemCCITTComitéConsultatifInternationalTélégraphiqueetTéléphoniqueDTXDiscontinuousTransmissionETSEuropeanTelecommunicationStandardGSMGlobalSystemforMobilecommunicationsMSMobileStationPCMPulseCodeModulatedPLMNPublicLandMobileNetworkPSTNPublicSwitchedTelephoneNetworkRFRadioFrequencyRSSRadioSubSystemRXReceiveSACCHSlowAssociatedControlCHannelSIDSIlenceDescriptorSPflagSPeechflagTAFTimeAlignmentFlagTXTransmitForabbreviationsnotgiveninthisclause,seeGSM01.04(ETR100)[1].4GeneralFigure1presentsareferenceconfigurationwherethevariousspeechprocessingfunctionsareidentified.Inthisfigure,therelevantStandardsforeachfunctionarealsoindicated.Infigure1,theaudiopartsincludinganaloguetodigitalanddigitaltoanalogueconversionareincluded,toshowthecompletespeechpathbetweentheaudioinput/outputintheMobileStation(MS)andthedigitalinterfaceofthePSTN.ThedetailedspecificationoftheaudiopartsarecontainedinGSM03.50(ETS300540)[2].Theseas
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