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)
- 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
SIST EN 301 243 V4.1.1:2003 is the Slovenian standard identical to ETSI EN 301 243 Version 4.1.1. It describes the Enhanced Full Rate (EFR) speech processing functions for GSM Phase 2 and points to the companion standards that define the detailed codec, discontinuous transmission, comfort noise, lost-frame handling and voice activity detection functions.
What does SIST EN 301 243 V4.1.1:2003 specify?
SIST EN 301 243 V4.1.1:2003 is an introduction to the EFR speech processing chain in GSM and a guide to the related ENs where each function is specified in detail. It gives the overall structure, the main interfaces and the way the speech path is split across several companion documents.
The document is organized as follows:
- Clause 1 - Scope
- Clause 2 - References
- Clause 3 - Definitions and abbreviations
- Clause 4 - General overview
- Clauses 5 to 11 - Transcoding, DTX, VAD, comfort noise, lost-frame handling, homing and an alternative AMR-based implementation
- Annex A - Informative Change Request History
In practice, this means the standard is mainly a roadmap and technical overview for the EFR speech functions rather than the place where every algorithm is fully developed.
What are the key requirements of SIST EN 301 243 V4.1.1:2003?
Speech path and transcoding
Clause 5 describes the EFR speech transcoder path. The encoder accepts 13-bit uniform PCM from the Mobile Station (MS) or, on the network side, from the Public Switched Telephone Network (PSTN) after 8-bit/A-law to 13-bit conversion. In practice, implementers need to keep the speech path aligned with the GSM interfaces and with the channel coding function in GSM05.03.
Clause 5 also links the codec to GSM06.60, which maps 160 speech samples to a 244-bit block and back, using 8,000 samples/s and 12,2 kbit/s Algebraic Code Excited Linear Prediction (ACELP). This is the core EFR codec behavior that codec software and test systems must reproduce.
DTX, VAD and comfort noise
Clauses 6, 7 and 8 describe Discontinuous Transmission (DTX), Voice Activity Detection (VAD) and comfort noise. The transmitter side uses VAD to decide whether a frame carries speech or Silence Descriptor (SID) information, and SID frames are used to update the receiver’s comfort noise. In practice, this reduces airtime use and avoids the sudden noise drop that listeners would otherwise hear during pauses.
Clause 6 also explains the roles of the Speech flag (SP), the Time Alignment Flag (TAF) and the Radio SubSystem (RSS). These flags coordinate the speech side with the radio side, so the system can key the transmitter, mark SID timing and support quality measurements in a consistent way.
Lost frames, homing and alternative implementation
Clause 9 covers lost speech and lost SID frames. An isolated lost speech frame is replaced by a predicted frame, while repeated losses are handled by muting; silence frames are not inserted. In practice, receiver logic has to hide transmission errors without pretending that normal speech is still present.
Clause 10 defines bit-exact homing for the EFR speech transcoder, VAD, DTX and comfort-noise parts. Homing frames force known internal states and support type approval, remote testing and operation and maintenance work. For users, that means repeatable behavior when equipment is reset or checked in the field.
Clause 11 allows an alternative EFR implementation based on the 12.2 kbit/s mode of the Adaptive Multi Rate (AMR) speech coder. The alternative must use the GSM DTX transmission format and comfort noise generation, and it is verified with the same digital test sequences. In practice, this gives implementers a second interoperable path, with the note that it adds delay.
What terms does SIST EN 301 243 V4.1.1:2003 define?
- ACELP - Algebraic Code Excited Linear Prediction, the speech coding method used by the EFR codec.
- DTX - Discontinuous Transmission, a mode that switches transmission on only for frames carrying useful information.
- VAD - Voice Activity Detector, the function that decides whether a frame contains speech.
- SID - Silence Descriptor, the frame type used to carry background-noise information.
- SP - Speech flag, the indicator that tells whether transmitted information is speech or SID data.
- TAF - Time Alignment Flag, the flag that marks the SID frame position within the Slow Associated Control CHannel (SACCH) multiframe.
- BFI - Bad Frame Indication, a signal used to mark a received frame as bad.
Who uses SIST EN 301 243 V4.1.1:2003?
SIST EN 301 243 V4.1.1:2003 is used by GSM speech-codec implementers, mobile terminal designers, infrastructure equipment teams and test laboratories. It is also relevant to type-approval activities and to operation and maintenance teams that need to force homing states or verify bit-exact behavior. In practice, the standard supports design, conformance testing and interoperability work for EFR speech functions.
What changed in SIST EN 301 243 V4.1.1:2003 from the previous edition?
SIST EN 301 243 V4.1.1:2003 updates Version 4.1.0 to Version 4.1.1 for publication. The change request history also records the earlier introduction of the alternative EFR implementation using the AMR 12.2 mode.
Which standards are used with SIST EN 301 243 V4.1.1:2003?
| Reference | What it contributes |
|---|---|
| GSM01.04 (ETR 100) | Abbreviations and acronyms used in GSM documents |
| GSM03.50 (ETS 300 540) | Transmission planning aspects of the speech service and the audio parts referenced in the speech path |
| GSM05.03 (ETS 300 575) | Channel coding used after EFR speech coding |
| GSM06.53 (EN 301 244) | ANSI-C code for the GSM EFR speech codec |
| GSM06.54 (EN 301 250) | Test vectors for the GSM EFR speech codec and related functions |
| GSM06.60 (EN 301 245) | EFR speech transcoding |
| GSM06.61 (EN 301 246) | Substitution and muting of lost frames |
| GSM06.62 (EN 301 247) | Comfort noise aspects |
| GSM06.81 (EN 301 248) | DTX for EFR speech traffic channels |
| GSM06.82 (EN 301 249) | VAD for EFR speech traffic channels |
| TS 26.071 | AMR 12.2 kbit/s mode used for the alternative implementation in clause 11 |
What does the SIST EN 301 243 V4.1.1:2003 document contain?
The document contains a general configuration figure for the speech path, a references section, an abbreviations list and the overview clauses for transcoding, DTX, VAD, comfort noise, lost-frame handling, homing and the AMR-based alternative. It also points to the companion ENs where the detailed algorithms, code and test vectors are defined. Annex A provides the change request history.
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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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