SIST EN 300 970 V7.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 7.0.1 Release 1998)
General Information
- Abstract
Upgrade from Phase 2+ to Release 1998
- 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 300 970 V7.0.1:2003 is a key standard in the field of digital cellular telecommunications, specifically for the GSM (Global System for Mobile Communications) Phase 2+ system. It defines the procedures for substitution and muting of lost frames in half rate speech traffic channels, aligned with GSM 06.21 version 7.0.1 (Release 1998). This standard ensures consistent voice quality and reliable operation of GSM networks, especially during transmission interruptions or frame losses.
Developed by the Slovenski inštitut za standardizacijo (SIST) and harmonized with European Telecommunications Standards Institute (ETSI) guidelines, this standard is obligatory for all GSM Base Station Systems (BSS) and Mobile Stations (MS) supporting half rate speech channels.
Key Topics
- Frame Substitution and Muting Procedures: Outlines how the GSM receiver (RX) Discontinuous Transmission (DTX) handler substitutes or mutes lost or unreliable speech and Silence Descriptor (SID) frames to maintain call quality.
- Error Detection and Concealment: Specifies how frames marked as unreliable (using Bad Frame Indication/BFI and Unreliable Frame Indication/UFI) are analyzed to reduce the risk of audible artifacts.
- Half Rate Speech Channels: Focuses on special mechanisms required for half rate speech codecs, which allow networks to double speech traffic capacity.
- Gradual Muting: Describes how, after consecutive lost frames, the output is muted in a controlled manner-ensuring the end user experiences a smooth transition to silence rather than abrupt disruptions.
- Subjective Speech Quality Improvement: Ensures that frames are only muted or substituted when strictly necessary, minimizing impact on the user experience.
Applications
Implementation of SIST EN 300 970 V7.0.1:2003 is vital in several real-world scenarios:
- Mobile Network Infrastructure: Mandatory for manufacturers and operators of GSM networks to ensure compatibility, reliable voice calls, and optimal bandwidth usage via half rate speech channels.
- Base Station and Mobile Station Design: Embedded in the firmware and software of GSM devices to handle lost or corrupted frames efficiently, improving overall service availability.
- Quality of Service (QoS) Management: Enhances user experience by providing sophisticated error concealment, which is critical in environments with variable radio conditions.
- Capacity Optimization: Used to support the wider introduction of half rate codecs, thereby increasing network capacity without compromising speech intelligibility or audio comfort.
Related Standards
For comprehensive GSM speech processing and error handling, refer to:
- GSM 06.02: Half rate speech processing functions
- GSM 06.20: Half rate speech transcoding
- GSM 06.22: Comfort noise aspects for half rate speech traffic channels
- GSM 06.41: Discontinuous Transmission (DTX) for half rate channels
- GSM 06.42: Voice Activity Detector (VAD) for half rate channels
- GSM 06.06: ANSI-C code for the GSM half rate speech codec
- GSM 06.07: Test sequences for the GSM half rate speech codec
These standards collectively define the requirements and implementations for robust digital speech communications over GSM Phase 2+, ensuring network operators and manufacturers can deliver consistent, high-quality mobile voice services even in challenging conditions.
Keywords: GSM standard, half rate speech, frame substitution, muting of lost frames, mobile communications standard, error concealment, digital cellular telecommunications, Release 1998, speech quality, GSM 06.21
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Frequently Asked Questions
SIST EN 300 970 V7.0.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 7.0.1 Release 1998)". This standard covers: Upgrade from Phase 2+ to Release 1998
Upgrade from Phase 2+ to Release 1998
SIST EN 300 970 V7.0.1:2003 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 300 970 V7.0.1:2003 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 300 970 V7.0.1:2003 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); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 7.0.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 970 Version 7.0.1SIST EN 300 970 V7.0.1:2003en01-december-2003SIST EN 300 970 V7.0.1:2003SLOVENSKI
STANDARD
ETSIEN300970V7.0.1(2000-01)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels(GSM06.21version7.0.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 970 V7.0.1:2003
ETSIETSIEN300970V7.0.1(2000-01)2(GSM06.21version7.0.1Release1998)ReferenceREN/SMG-110621Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 970 V7.0.1:2003
ETSIETSIEN300970V7.0.1(2000-01)3(GSM06.21version7.0.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.63Definitionsandabbreviations.63.1Definitions.63.2Abbreviations.64General.75Requirements.75.1ErrordetectionandconcealmentincaseofunreliablespeechorSIDframes.75.1.1Errordetection.75.1.2Outputsignalconcealment.75.2FramesubstitutionandmutingincaseoflostspeechorSIDframes.75.2.1Firstandsecondlostspeechframe.75.2.2Subsequentlostspeechframes.85.2.3FirstandsecondlostSIDframe.85.2.4SubsequentlostSIDframes.86Examplesolutions.86.1Examplesolutionforerrordetectionincaseofunreliableframes.86.2Examplesolutionforoutputsignalconcealmentincaseofunreliableframes.86.3Examplesolutionforsubstitutionandmutingoflostspeechframes.86.4ExamplesolutionforsubstitutionandmutingoflostSIDframes.9AnnexA(informative):ChangeRequestHistory.10History.11SIST EN 300 970 V7.0.1:2003
ETSIETSIEN300970V7.0.1(2000-01)4(GSM06.21version7.0.1Release1998)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).ThepresentdocumentdefinesaframesubstitutionandmutingprocedurewhichshallbeusedbytheReceive(RX)DiscontinuousTransmission(DTX)handlerforthehalfratespeechtrafficchannelswithinthedigitalcellulartelecommunicationssystem.Thepresentdocumentispartofaseriescoveringthehalfratespeechtrafficchannelsasdescribedbelow:GSM06.02"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions".GSM06.20"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechtranscoding".GSM06.21"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels".GSM06.22"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".GSM06.41"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".GSM06.42"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;VoiceActivityDetector(VAD)forhalfratespeechtrafficchannels".GSM06.06"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;ANSI-CcodefortheGSMhalfratespeechcodec".GSM06.07"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;TestsequencesfortheGSMhalfratespeechcodec".ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.SIST EN 300 970 V7.0.1:2003
ETSIETSIEN300970V7.0.1(2000-01)5(GSM06.21version7.0.1Release1998)NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 970 V7.0.1:2003
ETSIETSIEN300970V7.0.1(2000-01)6(GSM06.21version7.0.1Release1998)1ScopeThepresentdocumentdefinesaframesubstitutionandmutingprocedurewhichshallbeusedbytheReceive(RX)DiscontinuousTransmission(DTX)handlerwhenoneormorelostorunreliablespeechorSIlenceDescriptor(SID)framesarereceivedfromtheRadioSubSystem(RSS).TherequirementsofthepresentdocumentaremandatoryforimplementationinallGSMBaseStationSystems(BSS)sandMobileStations(MS)scapableofsupportingthehalfratespeechtrafficchannel.2ReferencesThe
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