SIST EN 300 903 V8.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system (GSM 03.50 version 8.0.1 Release 1999)
- Abstract
Upgrade to Release 1999
- 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
SIST EN 300 903 V8.0.1:2003 is the SIST adoption of ETSI EN 300 903 Version 8.0.1 for digital cellular telecommunications system (Phase 2+) (GSM). It specifies transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system, especially how GSM speech connections should interwork with the PSTN. It is written for network planners, mobile system designers, terminal makers and test laboratories that need to control speech quality, delay, echo and related impairments.
What does SIST EN 300 903 V8.0.1:2003 specify?
SIST EN 300 903 V8.0.1:2003 sets guidance, minimum requirements and test methods for speech transmission planning in GSM PLMNs. The document focuses on the connection between the mobile network and the PSTN, with attention to international and national routing, echo control and the acoustic behaviour of mobile stations.
Clause 1 gives references, abbreviations and the introduction. Clause 2 describes network configurations. Clause 3 sets the transmission performance requirements. The annexes then provide acoustic considerations, test conditions, detailed measurement methods and delay definitions.
| Annex | What it covers |
|---|---|
| Annex A | Acoustic interface considerations for handset, handsfree and headset MSs |
| Annex B | Test considerations such as signals, levels, rooms and arrangements |
| Annex C | Transmission requirements testing |
| Annex D | MS delay requirement definition |
| Annex E | Adaptive gain control |
| Annex F | Change Request History |
What are the key requirements of SIST EN 300 903 V8.0.1:2003?
The main requirements in SIST EN 300 903 V8.0.1:2003 are about loudness, delay, echo, clipping, noise and terminal acoustics. In practice, they tell designers and operators what to measure and what network situations to avoid so that speech remains usable across the GSM-PSTN boundary.
- Loudness ratings - Clause 3.1 sets nominal SLR and RLR targets for handset, handsfree and headset MSs. This matters because it defines how loud the terminal should sound to the far end and to the local user, and it also shows how volume controls are checked.
- Stability and echo - Clause 3.2 and 3.4 require stability loss at the POI and set echo-loss targets for the PLMN and the MS. This matters because poor echo control quickly makes conversations difficult, especially on long-delay routes.
- Delay limits - Clause 3.3 limits round-trip delay in the MS and sets planning limits for the PLMN, including a higher allowance for handsfree processing. This matters because delay combines with echo and clipping to make calls feel unnatural or hard to follow.
- Network planning constraints - Clause 2.4 warns against routeing choices that add delay or impair echo control, including satellite routeing, DSI, ADPCM, unsynchronised clock rates and tandem quantization distortion. This matters because these features can degrade speech even when each part looks acceptable on its own.
- Clipping and voice switching - Clause 3.5 links clipping to voice-operated devices such as DTX, echo suppressers and DSI, and recommends avoiding tandem voice switching. This matters because clipped speech is one of the main causes of poor conversational quality.
- Noise, frequency response and distortion - Clauses 3.6, 3.8 and 3.9 set limits for idle channel noise, sensitivity/frequency characteristics and distortion. This matters because these are the basic audio quality checks that show whether the terminal and codec chain are behaving correctly.
- Sidetone, out-of-band signals and crosstalk - Clauses 3.10 to 3.13 control sidetone, unwanted out-of-band energy and crosstalk. This matters because these impairments can make the user hear their own voice badly, create spurious tones or interfere with echo control.
- Ambient noise rejection - Clause 3.14 introduces MS ambient noise rejection, which is especially relevant in noisy mobile environments. This matters because a GSM speech path must still work in cars, streets and other high-noise locations.
What terms does SIST EN 300 903 V8.0.1:2003 define?
- PLMN - Public Land Mobile Network, the GSM mobile network whose speech transmission is being planned.
- POI - Point of Interconnection, the boundary where the PLMN connects to the PSTN.
- MRP - Mouth Reference Point, the acoustic reference point used for sending measurements.
- ERP - Ear Reference Point, the acoustic reference point used for receiving measurements.
- SLR - Sending Loudness Rating, the measure used to describe send loudness toward the network.
- RLR - Receiving Loudness Rating, the measure used to describe how loud received speech is to the user.
- STMR - Sidetone Masking Rating, the measure of how much of the user’s own speech is fed back to the user.
- LSTR - Listener Sidetone Rating, the measure used to describe sidetone performance as heard by the listener.
Who uses SIST EN 300 903 V8.0.1:2003?
SIST EN 300 903 V8.0.1:2003 is used by GSM network planners, MSC and BSS engineers, speech codec and terminal designers, and acoustic test laboratories. It is also used by type approval teams, operators planning PSTN interconnects, and quality managers who need to verify that handset, headset or handsfree speech paths meet the intended transmission behaviour.
Which standards are used with SIST EN 300 903 V8.0.1:2003?
The document relies heavily on related GSM and ITU-T work:
- GSM 01.04 and GSM 03.04 - abbreviations and call routeing to mobile subscribers.
- GSM 06.xx series - full-rate and half-rate speech processing, transcoding, lost-frame handling, comfort noise, DTX and VAD.
- I-ETS 300 245-2 and I-ETS 300 245-3 - handset, loudspeaking and handsfree telephony characteristics.
- ITU-T G-series and M-series recommendations - loudness ratings, delay, stability, echo, digital exchange and leased-circuit characteristics.
- ITU-T P-series recommendations - artificial mouths, artificial ears, artificial voices, handsfree telephony and measurement methods.
- ITU-T Q.35 and ISO 3 - telephone tones and preferred-number frequency series.
What does the SIST EN 300 903 V8.0.1:2003 document contain?
The document contains reference network models, configuration diagrams and detailed measurement methods for speech transmission planning. Figures 1 to 7 illustrate the PLMN model, interworking arrangements and the delay and echo-control cases that drive the planning rules.
Annex B defines the test signals, signal levels, test rooms and test arrangements, including handset and HATS-based setups. Annex C gives the test procedures for loudness, noise, sensitivity, distortion, sidetone, out-of-band signals, acoustic echo loss, delay and ambient noise rejection. Annex D defines how the MS delay requirement is calculated, while Annex E and Annex F provide adaptive gain control notes and change history.
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Frequently Asked Questions
SIST EN 300 903 V8.0.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system (GSM 03.50 version 8.0.1 Release 1999)". This standard covers: Upgrade to Release 1999
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SIST EN 300 903 V8.0.1:2003 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 300 903 V8.0.1:2003 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); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system (GSM 03.50 version 8.0.1 Release 1999)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 903 Version 8.0.1SIST EN 300 903 V8.0.1:2003en01-december-2003SIST EN 300 903 V8.0.1:2003SLOVENSKI
STANDARD
ETSIEN300903V8.0.1(2000-09)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);TransmissionplanningaspectsofthespeechserviceintheGSMPublicLandMobileNetwork(PLMN)system(GSM03.50version8.0.1Release1999)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)2(GSM03.50version8.0.1Release1999)ReferenceREN/SMG-110350Q8KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-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 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)3(GSM03.50version8.0.1Release1999)ContentsIntellectualPropertyRights.7Foreword.71Scope.81.1References.81.2Abbreviations.101.3Introduction.102Networkconfigurations.112.1General.112.2ModelofthePLMN.112.3Interfaces.112.4Configurationsofconnections.122.4.1Generalconfigurationsofconnections.122.4.2Referenceconfigurationstoillustratedelayandechocontrolissues.122.54-wirecircuitsinthePLMN.123Transmissionperformance.133.1OverallLoss/Loudnessratings.133.1.1ConnectionswithhandsetMSs.143.1.2ConnectionswithhandsfreeMSs.143.1.3ConnectionswithheadsetMSs.143.2StabilityLoss.153.3Delay.153.3.1General.153.3.2Sourcesofdelay.153.3.2.1ElementsofthePLMNthatcausedelay.153.3.2.2ElementsofthePSTNthatcausedelay.163.3.3Effectsofdelay.163.3.4AllocationofdelaytothePLMN.163.3.4.1AllocationofdelaytothePLMNwhenusingafullratesystem.163.3.4.2AllocationofdelaytothePLMNwhenusingahalfratesystem.163.3.5Delayofvariousnetworkconfigurations.173.3.5.1NationalandinternationalconnectionswithnoechocontrolinthePSTN(referenceconfigurationsA).173.3.5.2NationalandinternationalconnectionswithechocontrolinthePSTN(referenceconfigurationsB).173.3.5.3Connectionswherere-routeingleadstoasignificantincreaseintransmissionpathlength(referenceconfigurationsC).173.3.6DelayrelatedrequirementsontheMS.173.3.6.1FullrateMS.173.3.6.2HalfrateMS.173.3.6.3HandsfreeMS.173.4Echo.183.4.1General.183.4.2ElectricalechocontrolinthePLMN(ReferenceconfigurationsA).183.4.3AcousticechocontrolinthePLMN.183.4.3.1AcousticechocontrolinahandsfreeMS.193.4.3.2AcousticechocontrolinahandsetMS.193.4.3.3AcousticechocontrolinaheadsetMS.193.4.4Interactionbetweentandemechocontroldevices(referenceconfigurationsB&C).193.5Clipping.193.5.1General.193.5.2PropertiesofvoiceswitchesinthePLMN.193.5.3Problemsoftandemvoiceswitching.203.6Idlechannelnoise(handsetandheadsetMS).203.6.1Sending.203.6.2Receiving.20SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)4(GSM03.50version8.0.1Release1999)3.7Noisecontrast.203.7.1General.203.7.2ElementsofaPLMNwhichcancausenoisecontrastimpairment.213.7.3Reductionofnoisecontrast.213.7.3.1Reductionofnoisecontrastbylimitingthenoisereceivedbythemicrophone.213.7.3.1.1HeadsetMS.213.7.3.1.2HandsetMS.223.7.3.1.3HandsfreeMS.223.7.3.2Reductionofnoisecontrastbyinsertionofcomfortnoise.223.7.4Consequenceoftheintroductionofhighcomfortnoiselevelsonothervoice-operateddevices.223.8Sensitivity/frequencycharacteristics.223.8.1HeadsetandHandsetMSs.223.8.1.1Sending.223.8.1.2Receiving.233.8.2HandsfreeMS.233.8.2.1Sending.233.8.2.2Receiving.243.9Distortion(handsetandheadsetMS).243.9.1Sending.243.9.2Receiving.253.10Sidetone(handsetandheadsetMS).263.10.1Sidetoneloss.263.10.2Sidetonedistortion.263.11Out-of-bandsignals.263.11.1Discriminationagainstout-of-bandinputsignals.263.11.1.1HandsetandheadsetMS.263.11.1.2HandsfreeMS.263.11.2Spuriousout-of-bandsignals.273.11.2.1HandsetandheadsetMS.273.11.2.2HandsfreeMS.273.12Requirementsforinformationtones.273.13Crosstalk.273.13.1Nearandfarendcrosstalk.273.13.2Go/returncrosstalk.273.14MSAmbientNoiseRejection.283.14.1Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsetMS).283.14.2Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsfreeMS).283.14.3Half-Rate,(TCH-HS)MSandDual-Rate(TCH-FSandTCH-HS)MSAmbientNoiseRejection.28AnnexA(informative):ConsiderationsontheAcousticInterfaceoftheMobileStation.37A.1HandsfreeMS.37A.2HandsetMS.37A.3HeadsetMS.37A.4Inter-reactionwithDTX.37AnnexB(normative):Testconsiderations.38B.1Testsignals.38B.1.1Sinusoidalsignals.38B.1.2Artificialvoice.38B.2Testsignallevels.38B.2.1Sending.38B.2.1.1HandsetandheadsetMSs.38B.2.1.2OfficetypeHandsfreeMS.38B.2.1.3CartypeHandsfreeMS.39B.2.2Receiving.39B.3Testrooms.39B.3.1Anechoicroom.39SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)5(GSM03.50version8.0.1Release1999)B.4Testarrangement.40B.4.1Electro-acousticequipment.40B.4.2TestarrangementforhandsfreeMS.40B.4.2.1OfficetypehandsfreeMS.40B.4.2.2CartypehandsfreeMS.41B.4.2.3UseofHATSfortestingthereceivecharacteristicsofthecartypehandsfreeMS.42B.4.2.3.1EqualizationofHATS.42B.4.2.3.2Combinationofearsignals.43AnnexC(normative):Transmissionrequirementstesting.44C.1Loudnessratings.44C.1.1SendingLoudnessRating(SLR)–HandsetMS.44C.1.2SendingLoudnessRating(SLR)–HandsfreeMS.44C.1.3ReceivingLoudnessRating(RLR)–HandsetMS.44C.1.4ReceivingLoudnessRating(RLR)-HandsfreeMS.45C.2IdleChannelNoise.45C.2.1Sending.45C.2.2Receiving.45C.3Sensitivity/frequencycharacteristics.45C.3.1Sending-HandsetMS.45C.3.2Sending-HandsfreeMS.46C.3.3Receiving-Handset.46C.3.4Receiving-Handsfree.47C.4Distortion.47C.4.1Sending.47C.4.2Receiving.48C.5Variationofgainwithinputlevel.48C.5.1Sending.48C.5.2Receiving.48C.6Sidetone.48C.6.1Talkersidetone(STMR).48C.6.2Listenersidetone(LSTR).49C.7Sidetonedistortion.49C.8Out-of-bandsignals.49C.8.1Discriminationagainstout-of-bandinputsignalforhandsetandheadsetMS.49C.8.2Spuriousout-of-bandsignalsforhandsetandheadsetMS.49C.8.3Discriminationagainstout-of-bandsignalsforhandsfreeMS.49C.8.4Spuriousout-of-bandemissionsforhandsfreeMS.50C.9Acousticecholoss.50C.9.1Acousticecholoss-HandsetMS.50C.9.2Acousticecholoss-HandsfreeMS.50C.10DelayforhandsfreeMS.51C.10.1Uplink.51C.10.2Downlink.51C.10.3Result.52C.11Ambientnoiserejection.52C.11.1Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsetMS).53C.11.2Full-Rate,(TCH-FS)MSAmbientNoiseRejection(handsfreeMS).53C.11.3Half-Rate,(TCH-HS)MSandDual-Rate(TCH-FSandTCH-HS)MSAmbientNoiseRejection.53SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)6(GSM03.50version8.0.1Release1999)AnnexD(normative):MSdelayrequirementdefinition.54D.1FullrateMSdelayrequirementdefinition.54D.2HalfrateMSdelayrequirementdefinition.55AnnexE(informative):Adaptivegaincontrol.56AnnexF(informative):ChangeRequestHistory.57History.58SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)7(GSM03.50version8.0.1Release1999)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).Thepresentdocumentdescribesthetransmissionplanningaspectspertainingtothespeechservicewithinthedigitalcellulartelecommunicationssystem(Phase2+).ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version8.x.ywhere:8indicatesRelease1999ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:18August2000DateoflatestannouncementofthisEN(doa):30November2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31May2001DateofwithdrawalofanyconflictingNationalStandard(dow):31May2001SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)8(GSM03.50version8.0.1Release1999)1ScopeThepresentdocumentdescribesthetransmissionplanningaspectspertainingtothespeechserviceintheGSMPLMNsystem.Duetotechnicalandeconomicfactors,therecannotbefullcompliancewiththegeneralcharacteristicsofinternationaltelephoneconnectionsandcircuitsrecommendedbytheITU-T.Thepresentdocumentgivesguidanceastotheprecautions,measuresandminimumrequirementsneededforsuccessfulinterworkingofthePLMNwiththenationalandinternationalPSTN.Thepresentdocumentidentifiesanumberofrouteingandnetworkconfigurations.TheobjectiveistoreachaqualityascloseaspossibletoITU-TstandardsinordertosafeguardtheperformanceseenbyPSTNcustomers.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1999document,referencestoGSMdocumentsareforRelease1999versions(version8.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.04:"Digitalcellulartelecommunicationssystem(Phase2+);Signallingrequirementsrelatingtorouteingofcallstomobilesubscribers".[3]GSM06.01:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeechprocessingfunctions".[4]GSM06.10:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Transcoding".[5]GSM06.11:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Substitutionandmutingoflostframesforfullratespeechchannels".[6]GSM06.12:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;Comfortnoiseaspectforfullratespeechtrafficchannels".[7]GSM06.31:"Digitalcellulartelecommunicationssystem(Phase2+);Fullratespeech;DiscontinuousTransmission(DTX)forfullratespeechtrafficchannels".[8]GSM06.32:"Digitalcellulartelecommunicationssystem(Phase2+);VoiceActivityDetection(VAD)".[9]GSM06.02:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions".[10]GSM06.20:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechtranscoding".[11]GSM06.21:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels".SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)9(GSM03.50version8.0.1Release1999)[12]GSM06.22:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".[13]GSM06.41:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".[14]GSM06.42:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;VoiceActivityDetection(VAD)forhalfratespeechtrafficchannels".[15]I-ETS300245-2:"IntegratedServicesDigitalNetwork(ISDN):Technicalcharacteristicsoftelephonyterminals:Part2:PCMA-Lawhandsettelephony".[16]ITU-TRecommendationG.103(1998):"Hypotheticalreferenceconnections".[17]ITU-TRecommendationG.111(1993):"Loudnessratings(LRs)inaninternationalconnection".[18]ITU-TRecommendationG.113(1993):"Transmissionimpairments".[19]ITU-TRecommendationG.114(1993):"Meanone-waypropagationtime".[20]ITU-TRecommendationG.121(1993):"Loudnessratings(LRs)ofnationalsystems".[21]ITU-TRecommendationG.122(1993):"Influenceofnationalsystemsonstability,talkerecho,andlistenerechoininternationalconnections".[22]ITU-TRecommendationG.131(1988):"Stabilityandecho".[23]ITU-TRecommendationG.165(1993):"Echocancellers".[24]ITU-TRecommendationG.223(1988):"Assumptionsforthecalculationofnoiseonhypotheticalreferencecircuitsfortelephony".[25]ITU-TRecommendationG.703(1991):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[26]ITU-TRecommendationG.711(1988):"Pulsecodemodulation(PCM)ofvoicefrequencies".[27]ITU-TRecommendationG.712(1992):"Transmissionperformancecharacteristicsofpulsecodemodulation".[28]ITU-TRecommendationG.167(1993):"AcousticEchoControllers".[29]ITU-TRecommendationM.1020(1993):"Characteristicsofspecialqualityinternationalleasedcircuitswithspecialbandwidthconditions".[30]ITU-TRecommendationM.1025(1993):"Characteristicsofspecialqualityinternationalleasedcircuitswithbasicbandwidthconditioning".[31]ITU-TRecommendationM.1030(1988):"Characteristicsofordinaryqualityinternationalleasedcircuitsformingpartofprivateswitchedtelephonenetworks".[32]ITU-TRecommendationsM.1040(1988):"Characteristicsofordinaryqualityinternationalleasedcircuits".[33]ITU-TRecommendationO.132(1988):"Specificationforaquantizingdistortionmeasuringapparatususingasinusoidaltestsignal".[34]ITU-TRecommendationP.11(1993):"Effectoftransmissionimpairments".[35]ITU-TRecommendationP.34(1993):"Transmissioncharacteristicsofhands-freetelephones".[36]ITU-TRecommendationP.38(1993):"Transmissioncharacteristicsofoperatortelephonesystems(OTS)".[37]ITU-TRecommendationP.50(1993):"Artificialvoices".[38]ITU-TRecommendationP.51(1993):"Artificialmouths".SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)10(GSM03.50version8.0.1Release1999)[39]ITU-TRecommendationP.64(1993):"Determinationofsensitivity/frequencycharacteristicsoflocaltelephone".[40]ITU-TRecommendationP.76(1988):"Determinationofloudnessratings;fundamentalprinciples".[41]ITU-TRecommendationP.79(1993):"Calculationofloudnessratings".[42]ITU-TRecommendationQ.35(1988):"Technicalcharacteristicsoftonesforthetelephoneservice".[43]ITU-TRecommendationQ.551(1994):"Transmissioncharacteristicsofdigitalexchanges".[44]ITU-TBlueBook(1988):"VolumeV,Supplement13:Noisespectra".[45]ISO3(1973):"Preferrednumbers–seriesofpreferrednumbers".[46]ITU-TRecommendationP.57(1996):"ArtificialEars".[47]ITU-TRecommendationP.58(1993):"HeadandTorsoSimulatorforTelephonometry".[48]I-ETS300245-3:"IntegratedServicesDigitalNetwork(ISDN):Technicalcharacteristicsoftelephonyterminal:Part3:PCMA-lawloudspeakingandhandsfreetelephony".1.2AbbreviationsInadditiontothosebelow,theabbreviationsusedinthepresentdocumentarelistedinGSM01.04.ADCAnaloguetoDigitalConverterADPCMAdaptiveDifferentialPulseCodeModulationAECAcousticEchoControlBSCBaseStationController(excludingtransmissionsystemsBTSBaseTransceiverStation(excludingtransmissionsystems)DACDigitaltoAnalogueConverterDMRDigitalMobileRadioDSIDigitalSpeechInterpolationEECElectricEchoControlELEchoLossERPEarReferencePointFDMFrequencyDivisionMultiplexISCInternationalSwitchingLELocalExchangeLSTRListenerSidetoneRatingMRPMouthReferencePointOLROverallLoudnessRatingPCMPulseCodeModulationPOIPointofInterconnection(withPSTN)RLRReceiverLoudnessRatingSLRSendLoudnessRatingSTMRSidetoneMaskingRatingUPCMI13-bitUniformPCMInterface1.3IntroductionSincethetransmissionqualityandtheconversationalqualityofthePLMNwillingeneralbelowerthanthequalityofthePSTNconnectionduetocodingdistortion,delay,etc.,onlysometransmissionaspectscanbebroughtinlinewithITU-TRecommendations.Itisthereforenecessarytoimprovetheoverallqualityasmuchaspossiblebyimplementingproperrouteingandnetworkconfigurations.ItshouldberecognizedthatthetransmissionplanfortheGSMPLMNcannotleadtomajorchangesinthePSTN.However,itisimportanttousetheimprovementsintheevolvingPSTN(e.g.digitalization,introductionofechocancellers)inaneffectiveway.SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)11(GSM03.50version8.0.1Release1999)Thetransmissionrequirementsareinthefirstplacebasedoninternationalconnections.Whenthequalityissufficientforinternationalconnections,itcanbeassumedthatthenationalconnectionswillhavethesameorbetterquality.Inordertoobtainasufficientqualityintheconnection,itispreferabletohavedigitalconnectivitybetweentheBaseStationSystem(BSS)andtheinternationalexchange.ThePLMNrequirementsarebasedonthisassumption.Whenthissituationcannotbeprovided,alowerqualitymusttemporarilybeaccepted.Thepresentdocumentconsistsoftwoparts:onewilldealwithnetworkconfigurations,theotherwithtransmissionperformance.Thepartaboutnetworkconfigurationsgivesinformationaboutthereferenceconnections,onwhichthetransmissionplanisbased.Furthermore,someguidelinesarepresentedforimprovementofthetransmissionqualityintheevolving(digital)PSTN.ThepartabouttransmissionperformancegivesmainlycharacteristicsofthetransmissionbetweenMSacousticinterface(MRP/ERP)andtheinterfacebetweenthePLMNandthePSTN(POI).Fortransmissionaspectswhereitisimpossibletogiveoverallcharacteristics,itisinsomecasesnecessarytomakerecommendationsforindividualpartsoftheequipment.AnnexAconsiderstheeffectsofthetypeofacousticinterfacesoftheMS.2Networkconfigurations2.1GeneralThebasicconfigurationfortheinterworkingwiththePSTNisshowninfigure1.2.2ModelofthePLMNAmoredetailedmodelofthePLMNusedfortheconsiderationoftransmissionplanningissuesforspeechisshowninfigure2.Thismodelrepresentsthemainfunctionsrequiredanddoesnotnecessarilyimplyanyparticularphysicalrealization.RouteingofcallsisgiveninGSM03.04.Anyacousticechocontrolisnotspecificallyshownasitwillbeprovidedbyanalogueprocessingofdigitalprocessingoracombinationofbothtechniques.2.3InterfacesThemaininterfacesidentifiedwithintheGSMspecificationsareshowninfigure1.Forthepurposesofthepresentdocument,theAirInterfaceandthePointofInterconnect(POI)areidentifiedalongwithtwootherinterfaces,InterfaceZanda13-bitUniformPCMInterface(UPCMI).TheseinterfacesareneededtodefinethePLMNtransmissioncharacteristicsandtheoverallsystemrequirements.TheAirInterfaceisspecifiedbyGSM05seriesspecificationsandisrequiredtoachieveMStransportability.Analoguemeasurementscanbemadeatthispointbyusingtheappropriateradioterminalequipmentandspeechtranscoder.Thelossesandgainsintroducedbythetestspeechtranscoderwillneedtobespecified.ThePOIwiththePSTNwillgenerallybeatthe2048kbits/slevelataninterface,inaccordancewithITU-TRecommendationG.703.Atthepoint,whichisconsideredtohavearelativelevelofOdBr,theanaloguesignalswillberepresentedby8-bitA-law,accordingtoITU-TRecommendationG.711.Analoguemeasurementsmaybemadeatthispointusingastandardsendandreceiveside,asdefinedinITU-TRecommendations.InterfaceZmightbeusedinthecaseofdirectMSCtoMSCconnections.InterfaceZisofthesamenatureasthePOI.TheUPCMIisintroducedfordesignpurposesinordertoseparatethespeechtranscoderimpairmentsfromthebasicaudioimpairmentsoftheMS.SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)12(GSM03.50version8.0.1Release1999)2.4Configurationsofconnections2.4.1GeneralconfigurationsofconnectionsFigure3showsavarietyofconfigurationsofconnections.ThereareanumberofPSTNfeatureswhichshouldbeavoidedfromsuchconnections.Theseinclude:1)echocontroldevicesintheinternationalnetwork.Ifpresent,andnotdisabled,thesedeviceswillbeintandemwithPLMNechocancellersandmayintroducedegradation;2)satelliterouteings.ThedelayinherentintheconnectionswhenaddedtothePLMNdelay,mayresultinconversationaldifficulties.Doublesatellitelinksarelikelytocauseseveredifficultiesandspecialprecautionsshouldbetakentoavoidthissituationundercallforwardingarrangements;3)DigitalSpeechInterpolationsystems(DSI).ThereislikelytobeanadverseinteractionbetweenDSIandDTX;4)ADPCM.ThedistortionintroducedbyADPCMonrouteswherePSTNechocontrolisnotprovidedislikelytoreducetheechocancellationprovidedbythePLMNelectricechocanceller;5)significantdifferencesinclockratesonnon-synchronizeddigitalnetworkcomponents.TheresultingphaserollandslipsarelikelytodegradetheperformanceofthePLMNechocanceller;6)thoseanalogueFDMrouteingswhichexhibitphaseroll.AnyphaserollduetotheabsenceofsynchronizationbetweenthecarrierfrequenciesonthetwodirectionsoftransmissionislikelytodegradetheperformanceofthePLMNechocanceller;7)tandemconnectionsofsourcesofquantizationdistortion.ThePLMNspeechtranscoderisestimatedtobeequivalentto7QDUsbetweenuniformPCMinterfaces(seeITU-TRecommendationG.113).Itisrecognizedthatonsomeconnectionsitmaynotbefeasibletoavoidthesefeatures,butinmanycases,especiallyiftakenintoaccountattheplanningstage,thisshouldbepossible.2.4.2ReferenceconfigurationstoillustratedelayandechocontrolissuesThreebasicreferenceconfigurationtypesshowninfigures4to6aredefinedtoillustratedelayandechocontrolissues.IntermediateechocontroldevicesasshowninthefiguresaredisabledbyappropriatesignallingbetweentheMSCandISCorMSCandMSC.ReferenceconfigurationsA(seefigure4)representnationalorinternationalconnectionswherethereisnoechocontroldeviceinthePSTN.Thesereferenceconfigurationsincludere-routeingconfigurationswheretheoveralldelayofthetransmissionpathhasnotbeenextended.ReferenceconfigurationsB(seefigure5)representnationalorinternationalconnectionswhereechocontrolisprovidedinthePSTN.Thesereferenceconfigurationsincludere-routeingconfigurationswheretheoveralldelayofthetransmissionpathhasnotbeenextended.ReferenceconfigurationsC(seefigure6)representnationalorinternationalconnectionswherere-routeinghasleadtoanincreaseintheoveralldelayofthetransmissionpathbeyondrecommendedlimits.2.54-wirecircuitsinthePLMNAsshowninfigure2,thePLMNwillusuallycontaintransmissionsystems.Wherepresent,theyshouldprovide4-wirecircuits.Inthecaseofdigitalcircuitswhichdonotincludeanyspeechprocessingdevices,theoverallsystemrequirementsofthePLMNwillnotbeaffectedbythepresenceofthelink.Inthecaseofanaloguelinks,thetransmissioncharacteristics(e.g.attenuation,attenuationdistortion,noise)willaffecttheoverallsystemrequirementsofthePLMN.ITU-TRecommendationsM.1020,M.1025,M.1030andM.1040describeseveraltransmissioncharacteristicsforleasedcircuits.Incaseswheretheanaloguelinkintroducesloss,provisionwillhavetobemadeattheinterfacetorestoretheloss.SIST EN 300 903 V8.0.1:2003
ETSIETSIEN300903V8.0.1(2000-09)13(GSM03.50version8.0.1Release1999)3TransmissionperformanceTheoveralltransmissionperformanceofconnectionsinalternateconversationmodecanbeconsideredasasummationoftheeffectsof:1)theaudiopartbetweentheMRP/ERPandtheUPCMIinterface;2)thespeechtranscoderpartincludingtheeffectsofradiotransmission,andspeechprocessingbetweentheUPCMIandthePOI;3)theoverallcharacteristicsoftheconnectionbetweenPOIandtheotheruser.Thereisnotonlyalinearadditionoftheseeffectsbutthereisalsoaninfluencefromdifferentpartsoftheconnectionontheperformanceofthespeechtranscoderandotherspeechprocessingdevices.Wherepossible,thetransmissionperformanceisspecifiedbetweentheMRP/ERPandthePOI.Wherethisisnotpossible,thetransmissionaspectsoftheaudiopartmentionedabovehavebeenspecified.ThetransmissionaspectsofthespeechtranscoderarespecifiedinGSM06seriesspecifications.Inthefollowingparagraphs,requirementsarespecifiedfortheUPCMI,theAirInterfaceorthePOIasappropriate.ThetransmissionrequirementsoftheMShavebeenderivedfromtherequirementsofdigitaltelephonesstatedinI-ETS300245-2and3.MSswillhavetoworkinavarietyofenvironmentsrangingfromquietofficelocationstoverynoisyenvironmentsasfoundinmovingcars.Innoisyconditions,differentvaluesforthesendingandreceivingsensitivitiesrelativetothenominalvaluescanincreasetheperformanceoftheterminal.SomeguidanceisgiveninannexE.Theoveralltransmissionperformanceinfullduplexconversationmodewillalsogreatlydependontheperformanceoftheechocontroldeviceswhichmaybeincludedintheconnection.Thehandsfreerequirementsinthepresentdocumentaredesignedtoprovideabasiclevelofperformanceandtoavoidadverseinteractionswithothernetworks.Testingiscarriedoutinoneconfigurationinavehicle,whilstthisgivessomeconfidencethatthesystemcanworkinatypicalenvironment,thetestingisbynomeanscomplete.Itisassumedthatthemanufacturersubmitsthehandsfreesystemwiththetransducersfittedinreasonablelocationswithinthevehicle(thetransducersshouldnotimpedethenormaloperationofthevehicleoritsfittings).UnusualinstallationsshouldbeagreedforsuitabilitywiththerelevantTypeApprovalAuthoritybeforetesting.Inarealvehicleinstallation,careshouldbetakentoallowfortheacousticpropertiesofthatvehicleandthelikelyacousticenvironment.ItisimportantthatthebestpossiblecouplingbetweenthemicrophoneandtheMSuserisachieved.Hencethemicrophoneshouldbedirectionalandmountedasclosetotheuser'smouthaspractical.Theloudspeakersshouldbemountedinsuchawaythatthemaximumreceivesignalisdirectedattheuser,ratherthandissipatedbythevariousobstaclesinthatvehicle,suchastheseats.Properconsiderationforthenoiseenvironmentandthedirectcouplingbetweenthemicrophoneandloudspeakersisnecessary.ExcessivenoisecoupledintothemicrophonecanmasktheMSuser'ssendspeechandpotentiallyaffecttheoperationofDTX.Thevehiclenoiseenvironmentcanpotentiallymaskthereceivedspeech,unlesssufficientvolumeisprovided.However,directcouplingbet
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