SIST EN 300 723 V7.0.2:2003

• Abstract:

  SUBJECT Addition of mu-law (PCS 1900).

• 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 300 723 V7.0.2 (1999-12) - Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 7.0.2 Release 1998)

Overview

SIST EN 300 723 V7.0.2:2003 is a Slovenian standard that aligns with the European standard EN 300 723, focusing on the Digital Cellular Telecommunications System (GSM) Phase 2+ and specifically the Enhanced Full Rate (EFR) speech processing functions. This release provides a general description of speech processing mechanisms based on GSM 06.51, including the integration of mu-law (PCS 1900) coding support-a key enhancement for compatibility with North American telephony standards.

This document is essential for professionals working with GSM technology, as EFR dramatically improves voice quality and bandwidth efficiency in mobile networks. The standard outlines functional elements and references related GSM specifications for detailed aspects of speech coding, discontinuous transmission, comfort noise, and frame substitution.

Key Topics

• Enhanced Full Rate (EFR) Speech Processing: Overview of EFR speech channel transcoding techniques utilized to improve voice clarity and reduce data usage per call.
• mu-law (PCS 1900) Support: Added support for 8-bit mu-law PCM according to CCITT G.711, expanding the standard's applicability to PCS 1900, used in the North American market.
• Speech Channel Functions:
  • Transcoding: Guidelines for converting between mu-law or A-law (8-bit PCM) and 13-bit uniform PCM audio formats.
  • Discontinuous Transmission (DTX): Mechanisms for transmitting only active speech, reducing power consumption and interference.
  • Voice Activity Detection (VAD): Algorithms to distinguish between speech and silence, supporting DTX operation.
  • Comfort Noise Insertion: Methods for synthesizing background noise during silence periods for natural-sounding calls.
  • Lost Speech Frame Substitution and Muting: Procedures to handle lost or corrupted frames due to radio transmission errors.
  • Codec Homing: Protocols for resetting the codec to a predefined state, essential for equipment approval and remote maintenance.
• System Integration: Reference configurations outlining how these speech processing blocks interact within both the mobile station and the network side, including the interface with PSTN.

Applications

SIST EN 300 723 V7.0.2:2003 is widely applicable in:

• Mobile Network Infrastructure: Implementation of base station subsystems and mobile switching centers using EFR for enhanced GSM call quality.
• Handset Manufacturing: Integration of EFR codecs and mu-law transcoding in mobile devices to ensure compatibility with international networks, including PCS 1900.
• Voice Quality Optimization: Telecom operators can leverage EFR speech codecs and comfort noise mechanisms to provide clearer, more reliable call experiences.
• Compliance and Testing: Ensures telecom equipment adheres to standardized codec behavior, supports type approval processes, and facilitates remote diagnostics and maintenance.

Related Standards

For a comprehensive understanding and proper implementation, the following GSM documents and standards are directly referenced and should be consulted:

• GSM 06.60: Enhanced Full Rate (EFR) speech transcoding specifics
• GSM 06.61: Lost speech frame substitution and muting for EFR channels
• GSM 06.62: Comfort noise aspects for EFR speech
• GSM 06.81: Discontinuous transmission (DTX) for EFR
• GSM 06.82: Voice activity detector (VAD) for EFR
• GSM 03.50: Transmission planning aspects in GSM PLMN
• GSM 05.03: Channel coding principles
• GSM 06.53, 06.54: Codec software and test vectors

Keywords: GSM, Enhanced Full Rate, EFR, speech codec, mu-law, PCS 1900, digital cellular telecommunications, comfort noise, voice activity detection, DTX, transcoding, mobile communications standards.

By adhering to SIST EN 300 723 V7.0.2:2003, organizations ensure optimal GSM speech quality, broader international compatibility, and efficient system maintenance in digital mobile telecommunications environments.

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 7.0.2 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 723 Version 7.0.2SIST EN 300 723 V7.0.2:2003en01-december-2003SIST EN 300 723 V7.0.2:2003SLOVENSKI
STANDARD
ETSIEN300723V7.0.2(1999-12)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechprocessingfunctions;Generaldescription(GSM06.51version7.0.2Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 723 V7.0.2:2003

ETSIETSIEN300723V7.0.2(1999-12)2(GSM06.51version7.0.2Release1998)ReferenceREN/SMG-020651Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute1999.Allrightsreserved.SIST EN 300 723 V7.0.2:2003

ETSIETSIEN300723V7.0.2(1999-12)3(GSM06.51version7.0.2Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitionsandabbreviations.63.1Definitions.63.2Abbreviations.64General.65EnhancedFullRatespeechchanneltranscoding.86EnhancedFullRatespeechchanneldiscontinuoustransmission(DTX).87EnhancedFullRatespeechchannelVoiceActivityDetection(VAD).88EnhancedFullRatespeechchannelcomfortnoiseinsertion.99EnhancedFullRatespeechchannellostspeechframesubstitutionandmuting.910EnhancedFullRatecodechoming.9AnnexA(informative):ChangeRequestHistory.11History.12SIST EN 300 723 V7.0.2:2003

ETSIETSIEN300723V7.0.2(1999-12)4(GSM06.51version7.0.2Release1998)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)hasbeenproducedbySpecialMobileGroup(SMG).ThepresentdocumentintroducestheEnhancedFullRate(EFR)speechtrafficchannelswithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:3December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 723 V7.0.2:2003

ETSIETSIEN300723V7.0.2(1999-12)5(GSM06.51version7.0.2Release1998)1ScopeThepresentdocumentisanintroductiontoGSM06.60[6],GSM06.61[7],GSM06.62[8],GSM06.81[9]andGSM06.82[10]ENsdealingwiththespeechprocessingfunctionsintheEnhancedFullRatechanneloftheGSMsystem.Ageneraloverviewofthespeechprocessingfunctionsisgiven,withreferencetotheENswhereeachfunctionisspecifiedindetail.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]GSM03.50:"Digitalcellulartelecommunicationssystem(Phase2+);TransmissionplanningaspectsofthespeechserviceintheGSMPublicLandMobileNetwork(PLMN)system".[3]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[4]GSM06.53:"Digitalcellulartelecommunicationssystem(Phase2+);ANSI-CcodefortheGSMEnhancedFullRate(EFR)speechcodec".[5]GSM06.54:"Digitalcellulartelecommunicationssystem(Phase2+);TestvectorsfortheGSMEnhancedFullRate(EFR)speechcodec".[6]GSM06.60:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechtranscoding".[7]GSM06.61:"Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframeforEnhancedFullRate(EFR)speechtrafficchannels".[8]GSM06.62:"Digitalcellulartelecommunicationssystem(Phase2+);ComfortnoiseaspectsforEnhancedFullRate(EFR)speechtrafficchannels".[9]GSM06.81:"Digitalcellulartelecommunicationssystem(Phase2+);Discontinuoustransmission(DTX)forEnhancedFullRate(EFR)speechtrafficchannels".[10]GSM06.82:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetector(VAD)forEnhancedFullRate(EFR)speechtrafficchannels".SIST EN 300 723 V7.0.2:2003

ETSIETSIEN300723V7.0.2(1999-12)6(GSM06.51version7.0.2Release1998)3Definitionsandabbreviations3.1DefinitionsDefinitionoftermsusedinthepresentdocumentcanbefoundinGSM06.60[6],GSM06.61[7],GSM06.62[8],GSM06.81[9]andGSM06.82[10].3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ACELPAlgebraicCodeExcitedLinearPredictionBFIBadFrameIndicationBSSBaseStationSystemCCITTComitéConsultatifInternationalTélégraphiqueetTéléphoniqueDTXDiscontinuousTransmissionETSEuropeanTelecommunicationStandardGSMGlobalSystemforMobilecommunicationsMSMobileStationPCMPulseCodeModulatedPLMNPublicLandMobileNetw
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