SIST EN 300 729 V7.1.1:2003

• Abstract:

  Upgrade from Phase 2+ to Release 1998

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• 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
• Ref Project: ETSI EN 300 729 V7.1.1 (2000-05) - Digital cellular telecommunications system (Phase 2+) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 7.1.1 Release 1998)

SIST EN 300 729 V7.1.1:2003 is the Slovenian adoption of ETSI EN 300 729 Version 7.1.1, a European Telecommunications Standard for Global System for Mobile Telecommunications (GSM). It specifies Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels in GSM Mobile Stations (MS) and Base Station Systems (BSS), so implementers can match transmit and receive behavior on the air interface.

What does SIST EN 300 729 V7.1.1:2003 specify?

SIST EN 300 729 V7.1.1:2003 specifies the general baseband operation of EFR speech traffic channels during DTX. The document covers both the transmit and receive sides, and it is written so that the air-interface behavior and speech decoder output stay consistent even if implementations distribute functions differently.

The scope makes one BSS case mandatory: when the speech transcoder is remote in the Base Station Controller (BSC), the interfaces between the DTX handlers and the Radio SubSystem (RSS), together with their flags, must follow the described A-bis behavior. The DTX functions are mandatory in GSM MSs. On the receive side they are mandatory in all GSM BSSs, while the transmit-side requirements apply only where downlink DTX is used.

The document is organized into these main parts: scope, references, definitions/symbols/abbreviations, general principles, transmit side, receive side, and informative Annex A on change request history.

What are the key requirements of SIST EN 300 729 V7.1.1:2003?

The core requirement of SIST EN 300 729 V7.1.1:2003 is that DTX shall switch off transmission during speech pauses in a controlled way, while preserving intelligible speech and natural-sounding background noise. In practice, the standard splits this into transmitter-side detection and SID generation, then receiver-side comfort-noise generation and error handling.

• Clause 4 states the purpose of DTX: save power in the MS and reduce overall interference on the air interface. It also says the network commands DTX operation in the MS through GSM 04.08, so DTX is controlled, not automatic.
• Clause 4.1 requires three functions: a Voice Activity Detector (VAD) on the TX side, background-noise estimation on the TX side, and comfort-noise generation on the RX side. That means the radio does not simply go silent during pauses.
• Clause 5.1.1 defines the TX handler behavior. Speech frames pass with SPflag = "1", the first 7 frames after reset are treated as speech frames, and the first SID frame appears after the 8-frame hangover period. This keeps the encoder and decoder synchronized when speech stops.
• Clause 5.1.1 also covers short speech bursts. If fewer than 24 frames have elapsed since the last SID frame, the last SID frame is repeated until a new updated SID frame is ready. This avoids unnecessary switching and helps prevent audible artifacts.
• Clause 5.1.2 defines what the TX Radio SubSystem sends: all frames marked SPflag = "1", the first SPflag = "0" frame after speech, and SPflag = "0" frames aligned with the SACCH multiframe structure. If a SID frame is stolen for FACCH signaling, the next frame is sent instead.
• Clause 6.1.1 defines receive-side frame classification using the BFI, SID and TAF flags. The RSS uses these flags to distinguish valid SID frames, good speech frames, invalid SID frames, and unusable frames.
• Clause 6.1.2 defines RX handling. Good speech frames go straight to the speech decoder, lost speech and lost SID frames use substitution and muting, and valid SID frames drive comfort-noise generation until the next SID is expected or speech returns. That keeps pause periods sounding stable rather than abruptly dead.
• Clause 6.1.2 also requires invalid SID frames to be replaced by the last valid SID frame. This preserves comfort-noise continuity when a received SID frame is corrupted.

What terms does SIST EN 300 729 V7.1.1:2003 define?

• accepted SID frame - A traffic frame flagged with SID = "1" or SID = "2" by the RSS.
• valid SID frame - A good traffic frame flagged with SID = "2"; it can update comfort-noise parameters at any time.
• invalid SID frame - An accepted SID frame that is not valid for updating comfort-noise parameters, but still signals that comfort-noise generation should start or continue.
• hangover period - The 7-frame period after speech ends during which VADflag = "0" and SPflag = "1".
• SPflag - A binary flag from the TXDTX handler that tells the RSS whether a frame is speech ("1") or SID ("0").
• TAFflag - A time-alignment flag that marks frames aligned with the SACCH multiframe and indicates when the next SID frame is expected.

Who uses SIST EN 300 729 V7.1.1:2003?

SIST EN 300 729 V7.1.1:2003 is used by GSM MS and BSS implementers, especially engineers working on speech codecs, radio subsystems, and base-station interfaces. It is also relevant to integration and test teams that verify frame classification, comfort-noise behavior, and handover synchronization.

Quality managers and buyers use it to check whether a product supports the GSM DTX behavior required for EFR speech traffic channels. Network and system engineers use it when planning downlink DTX, remote transcoders, and interoperability between the BSC and RSS.

What changed in SIST EN 300 729 V7.1.1:2003 from the previous edition?

Annex A records a change request history leading to version 7.1.1. The listed change for version 7.1.1 is a correction of the DTX synchronization problem at handover, and the document history identifies this issue as the reason for the update.

Which standards are used with SIST EN 300 729 V7.1.1:2003?

This standard relies on these named companion standards and references:

• GSM01.04 - abbreviations and acronyms.
• GSM04.08 - mobile radio interface layer 3; also the network command for DTX operation.
• GSM05.03 - channel coding.
• GSM05.05 - radio transmission and reception; includes BFI performance.
• GSM05.08 - radio subsystem link control; includes SACCH multiframe alignment.
• GSM06.51 - general description of EFR speech processing functions.
• GSM06.53 - ANSI-C code for the GSM EFR speech codec.
• GSM06.54 - test vectors for the GSM EFR speech codec.
• GSM06.60 - EFR speech transcoding.
• GSM06.61 - substitution and muting of lost frames for EFR speech traffic channels.
• GSM06.62 - comfort-noise aspects for EFR speech traffic channels.
• GSM06.82 - Voice Activity Detector (VAD) for EFR speech traffic channels.
• GSM08.60 - in-band control of remote transcoders and rate adaptors for EFR and full rate traffic channels.

What does the SIST EN 300 729 V7.1.1:2003 document contain?

SIST EN 300 729 V7.1.1:2003 contains transmit-side and receive-side block diagrams, plus worked timing examples for the hangover and short speech burst cases. It also contains a traffic-frame classification table that shows how BFI, SID and TAF combine into the receive-side handling categories.

The figures and the table are there to support implementation and verification, not to add extra theory. Annex A provides the change request history, which helps readers trace how the specification reached version 7.1.1.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 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 300 729 Version 7.1.1SIST EN 300 729 V7.1.1:2003en01-december-2003SIST EN 300 729 V7.1.1:2003SLOVENSKI
STANDARD
ETSIEN300729V7.1.1(2000-04)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);DiscontinuousTransmission(DTX)forEnhancedFullRate(EFR)speechtrafficchannels(GSM06.81version7.1.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 729 V7.1.1:2003

ETSIETSIEN300729V7.1.1(2000-04)2(GSM06.81version7.1.1Release1998)ReferenceREN/SMG-020681Q7R1KeywordsDigitalcellulartelecommunicationssystem,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 300 729 V7.1.1:2003

ETSIETSIEN300729V7.1.1(2000-04)3(GSM06.81version7.1.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitions,symbolsandabbreviations.63.1Definitions.63.2Symbols.73.3Abbreviations.74General.74.1Generalorganization.75Transmit(TX)side.85.1Generaloperation.85.1.1FunctionsoftheTXDTXhandler.85.1.2FunctionsoftheTXRadioSubsystem.106Receive(RX)side.116.1Generaloperation.116.1.1FunctionsoftheRXradiosubsystem.116.1.2FunctionsoftheRXDTXhandler.12AnnexA(informative):ChangeRequestHistory.13History.14SIST EN 300 729 V7.1.1:2003

ETSIETSIEN300729V7.1.1(2000-04)4(GSM06.81version7.1.1Release1998)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).ThepresentdocumentdescribesthegeneralbasebandoperationofEnhancedFullRatespeechtrafficchannelsinthetransmitterandinthereceiverofGSMMobileStationsandBaseStationSystemsduringDiscontinuousTransmission(DTX)withinthedigitalcellulartelecommunicationssystem.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 300 729 V7.1.1:2003

ETSIETSIEN300729V7.1.1(2000-04)5(GSM06.81version7.1.1Release1998)1ScopeThepresentdocumentgivesadescriptionofthegeneralbasebandoperationofEnhancedFullRatespeechtrafficchannelsinthetransmitterandinthereceiverofGSMMobileStations(MS)sandBaseStationSystems(BSS)sduringDiscontinuousTransmission(DTX).Forclarity,thedescriptionisstructuredaccordingtotheblockdiagramsinfigures1and4.Exceptinthecasedescribednext,thisstructureofdistributingthevariousfunctionsbetweensystementitiesisnotmandatoryforimplementation,aslongastheoperationontheairinterfaceandonthespeechdecoderoutputremainsthesame.InthecaseofBSSswherethespeechtranscoderislocatedremotelyintheBaseStationController(BSC),theimplementationoftheinterfacesbetweentheDTXhandlersandtheRadioSubSystem(RSS)asdescribedinthepresentdocumenttogetherwithalltheirflagsismandatory,beingpartoftheA-bisinterfaceasdescribedinGSM08.60[13].TheDTXfunctionsdescribedinthepresentdocumentaremandatoryforimplementationintheGSMMSs.ThereceiverrequirementsaremandatoryforimplementationinallGSMBSSs,thetransmitterrequirementsonlyforthosewheredownlinkDTXwillbeused.2ReferencesThefollowingdocumentscontainprovisionswhich,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]GSM04.08:"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[3]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[4]GSM05.05:"Digitalcellulartelecommunicationssystem(Phase2+);Radiotransmissionandreception".[5]GSM05.08:"Digitalcellulartelecommunicationssystem(Phase2+);Radiosubsystemlinkcontrol".[6]GSM06.51:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechprocessingfunctions;Generaldescription".[7]GSM06.53:"Digitalcellulartelecommunicationssystem(Phase2+);ANSI-CcodefortheGSMEnhancedFullRate(EFR)speechcodec".[8]GSM06.54:"Digitalcellulartelecommunicationssystem(Phase2+);TestvectorsfortheGSMEnhancedFullRate(EFR)speechcodec".[9]GSM06.60:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechtranscoding".SIST EN 300 729 V7.1.1:2003

ETSIETSIEN300729V7.1.1(2000-04)6(GSM06.81version7.1.1Release1998)[10]GSM06.61:"Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframeforEnhancedFullRate(EFR)speechtrafficchannels".[11]GSM06.62:"Digitalcellulartelecommunicationssystem(Phase2+);ComfortnoiseaspectsforEnhancedFullRate(EFR)speechtrafficchannels".[12]GSM06.82:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetector(VAD)forEnhancedFullRate(EFR)speechtrafficchannels".[13]GSM08.60:"Digitalcellulartelecommunicationssystem(Phase2+);InbandcontrolofremotetranscodersandrateadaptorsforEnhancedFullRate(EFR)andfullratetrafficchannels".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply.acceptedSIDframe:AtrafficframewhichisflaggedwithSID="1"orSID="2"bytheRadioSubsystem.badtrafficframe:AtrafficframeflaggedBFIflag="1"(BadFrameIndication)bytheRadioSubsystem.frame:Timeintervalof20msec.correspondingtothetimesegmentationoftheEnhancedFullRatespeechtranscoder(GSM06.60[9]),alsousedasashorttermforatrafficframe.goodspeechframe:AgoodtrafficframewhichisnotanacceptedSIDframe.goodtrafficframe:AtrafficframeflaggedBFIflag="0"bytheRadioSubsystem.hangoverperiod:Aperiodof7framesaddedattheendofaspeechburstinwhichVADflag="0"andSPflag="1".invalidSIDframe:AnacceptedSIDframewhichwasnotclassified
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