SIST EN 300 945 V7.0.3:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Rate adaption on the Mobile Station - Base Station System (MS - BSS) Interface (GSM 04.21 version 7.0.3 Release 1998)
- Abstract
SUBJECT Synchronisation
- 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 300 945 V7.0.3:2003 is the Slovenian adoption of ETSI EN 300 945 Version 7.0.3 for GSM Phase 2+. It specifies the rate adaptation functions used in Mobile Stations to match terminal interface data rates to the MS-BSS interface in the digital cellular telecommunications system. The document is for GSM implementers who need to design, test, or verify transparent and non-transparent data services, including synchronous and asynchronous bearer handling.
What does SIST EN 300 945 V7.0.3:2003 specify?
SIST EN 300 945 V7.0.3:2003 defines the MS-side rate adaptation functions for GSM PLMN data and telematic services, in line with GSM03.10. It also notes that a complete PLMN rate-adaptation view needs GSM08.20 for the BSS-MSC side.
The document is organized into clauses 1 to 12:
- clauses 1-3 cover scope, references, abbreviations, and the overall approach
- clauses 4-9 cover RA0, RA1, RA1'', RA2, RA1/RA1' and the related frame mappings
- clause 10 covers Split/Combine and padding for multislot connections
- clause 11 covers non-transparent bearer services
- clause 12 collects the frame-structure figures
| Annex | What it covers |
|---|---|
| Annex A | Stacks of rate adaptation for single-slot and multislot operation |
| Annex B | Example of mapping Network Independent Clocking information for TCH/F14.4 when the S-interface is deployed |
| Annex C | Change history |
What are the key requirements of SIST EN 300 945 V7.0.3:2003?
RA0, RA1, RA1'' and RA2
SIST EN 300 945 V7.0.3:2003 defines RA0 for asynchronous-to-synchronous conversion, RA1 for synchronous rates up to 38.4 kbit/s, RA1'' for 48 kbit/s and 56 kbit/s to 64 kbit/s, and RA2 for adaptation to and from the 64 kbit/s S-interface rate. In practice, this is the set of functions that turns terminal-side data into the rate and framing needed by the GSM bearer path.
- RA0 pads asynchronous input with stop elements and handles break, overspeed, parity bits, and flow control.
- RA1 uses V.110 80-bit frames and carries user-data-rate, Network Independent Clocking (NIC), and multiframe synchronisation in the E bits.
- RA1'' uses V.110 32-bit and 64-bit frames for the 48 kbit/s and 56 kbit/s cases.
- RA2 keeps the bit order at the S-interface and sets unused bits to binary 1.
Radio-interface adaptation
SIST EN 300 945 V7.0.3:2003 maps intermediate rates to radio-interface rates of 14.5, 12, 6, and 3.6 kbit/s through RA1/RA1'. This matters because the radio side uses modified V.110 frame structures, and the correct bits must be removed, repeated, or mapped depending on the rate and whether the service is transparent or non-transparent.
- Clause 8.1 covers single-slot operation, including 14.5 kbit/s, 12 kbit/s, 6 kbit/s, and 3.6 kbit/s.
- Clause 8.1.6 covers synchronisation between the relevant interfaces.
- Clause 8.1.7 defines idle frames sent when no radio data is available.
Multislot operation, Split/Combine, and padding
SIST EN 300 945 V7.0.3:2003 uses Split/Combine to distribute the overall data stream across substreams in multislot configurations, then recombine it at the receiver. Clause 10 also defines padding when the available channel capacity is larger than needed for the required AIUR.
In practice, this means the implementation must preserve the order of frames or data blocks, carry substream numbering in-band, and apply NIC compensation correctly across parallel substreams.
Non-transparent bearer services
SIST EN 300 945 V7.0.3:2003 gives separate handling for non-transparent services in clause 11. For TCH/F9.6 and TCH/F4.8, RA1' provides access to 12 kbit/s and 6 kbit/s radio-interface rates, and it aligns RLP frames across the radio slots. For TCH/F14.4, the document uses 576-bit RLP frames and a different handling of M1 and M2.
What terms does SIST EN 300 945 V7.0.3:2003 define?
- Overall data stream - the data flow in parts of the network where the traffic is not split into multiple channels.
- Substream - a numbered stream between Split and Combine functions in multislot operation.
- Channel - one physical full-rate radio-interface channel, independent of the payload it carries.
- Intermediate rate - the rate used in the overall data stream before radio-interface adaptation.
- Multislot intermediate rate - the intermediate rate per substream when the overall data stream is split.
- Substream rate - the user rate on one substream, including padding where padding applies.
Who uses SIST EN 300 945 V7.0.3:2003?
SIST EN 300 945 V7.0.3:2003 is used by GSM terminal designers, Mobile Station implementers, radio and base-station engineers, and teams responsible for terminal adaptation functions. It also supports interoperability testing and conformance checking for data and telematic services that use GSM bearer capabilities.
What changed in SIST EN 300 945 V7.0.3:2003 from the previous edition?
SIST EN 300 945 V7.0.3:2003 is published as Version 7.0.3 and updates the earlier Version 7.0.2. The change history records earlier work on HSCSD, 14.4 kbit/s support, rate-adaptation clarifications, synchronisation, and break handling.
Which standards are used with SIST EN 300 945 V7.0.3:2003?
SIST EN 300 945 V7.0.3:2003 refers to GSM01.04 for abbreviations, GSM03.10 for PLMN connection types, GSM05.03 for channel coding, GSM07.01 for terminal adaptation functions, GSM07.02 and GSM07.03 for bearer capabilities, GSM08.20 for BSS-MSC rate adaptation, and GSM02.34 and GSM03.34 for HSCSD service descriptions. It also uses CCITT Recommendation V.110 and CCITT Recommendation X.30 as the framing and adaptation model behind several of the rate-conversion procedures.
What does the SIST EN 300 945 V7.0.3:2003 document contain?
SIST EN 300 945 V7.0.3:2003 contains rate-to-rate mapping tables, modified V.110 frame structures, bit-position diagrams, and procedures for break handling, NIC, synchronisation, padding, and multislot distribution. The figures cover the transparent and non-transparent frame formats used by the MS, and the annexes add example stacks, an NIC mapping example, and the change history.
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Frequently Asked Questions
SIST EN 300 945 V7.0.3:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Rate adaption on the Mobile Station - Base Station System (MS - BSS) Interface (GSM 04.21 version 7.0.3 Release 1998)". This standard covers: SUBJECT Synchronisation
SUBJECT Synchronisation
SIST EN 300 945 V7.0.3:2003 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 300 945 V7.0.3:2003 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); Rate adaption on the Mobile Station - Base Station System (MS - BSS) Interface (GSM 04.21 version 7.0.3 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 945 Version 7.0.3SIST EN 300 945 V7.0.3:2003en01-december-2003SIST EN 300 945 V7.0.3:2003SLOVENSKI
STANDARD
ETSIEN300945V7.0.3(1999-12)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);RateadaptionontheMobileStation-BaseStationSystem(MS-BSS)Interface(GSM04.21version7.0.3Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)2(GSM04.21version7.0.3Release1998)ReferenceREN/SMG-040421Q7(8r003i20.PDF)KeywordsDigitalcellulartelecommunicationssystem,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,thereferenceshouldbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute1999.Allrightsreserved.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)3(GSM04.21version7.0.3Release1998)ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.62.1Abbreviationsanddefinitions.73Generalapproach.73.1Overviewofdataratesandconfigurations.74TheRA0Function.104.1Asynchronous-to-SynchronousConversion(RA0).104.2Breaksignal.104.3Overspeed/Underspeed.104.4ParityBits.104.5FlowControl.115TheRA1Function.115.1Adaptationofsynchronousdataratesupto38,4kbit/s.115.1.1NetworkIndependentClocking.125.1.1.1MultiframeStructure.125.1.1.2Encodingandcompensation.126TheRA1''function.136.1Rateadaptationof48kbit/suserrateswithDTE/DCEstatusto64kbit/s.136.2Rateadaptationof56kbit/suserrateto64kbit/s.137TheRA2Function.148TheRA1/RA1'Function.148.1Singleslotrates.148.1.1Radiointerfacerateof14,5kbit/s.158.1.1.1Multiframestructureovertheradio-interface.158.1.1.2Radio-interfacedatablockforTCH/F14.4channelcoding.178.1.2RadioInterfacerateof12kbit/s.178.1.4RadioInterfacerateof6kbit/s.188.1.5RadioInterfacerateof3,6kbit/s(transparentservicesonly).198.1.6Synchronisation.198.1.7Idleframes.198.2Multislotrates.198.2.1TCH/F14.4multislotoperation.208.2.2AIURsupto38,4kbit/susingTCH/F9.6andTCH/F4.8channelcodings.208.2.3AIURsupto38,4kbit/susingTCH/F14.4channelcoding.208.2.4AIURof48kbit/s;Intermediaterateof64kbit/s;Radiointerfacerateof5x12kbit/s.218.2.5AIURof48kbit/s;Intermediaterateof64kbit/s;Radiointerfacerateof4x14,5kbit/s.218.2.6AIURof56kbit/s;Intermediaterateof64kbit/s;.218.2.7AIURof56kbit/s;Intermediaterateof64kbit/s;Radiointerfacerateof4x14,5kbit/s.228.2.8AIURof64kbit/s;Radiointerfacerateof6x12kbit/s.228.2.9AIURof64kbit/s;Radiointerfacerateof5x14,5kbit/s.229TheRA1'Function.229.1Synchronoususerratesupto9,6kbit/s.239.2Synchronoususerratesfrom9,6kbit/sonward;TCH/F9.6/4.8channelcodings.239.3Synchronoususerratesfrom9,6kbit/sonward;TCH/F14.4channelcoding.2310TheSplit/CombineandPadding-functions.2410.1Dataframedistributionintothesubstreams/channelsbytheSplit/Combinefunction.2410.1.1Dataframedistributionintothesubstreams/channelsbytheSplit/Combinefunction(TCH/F9.6andTCH/F4.8channelcodings).24SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)4(GSM04.21version7.0.3Release1998)10.1.2DatablockdistributionintothesubstreamsbytheSplit/Combinefunction(TCH/F14.4channelcoding).2410.2Substreamnumberingintransparentoperation.2510.2.1SubstreamnumberingforTCH/F14.4channelcoding.2510.3SubstreamSynchronisation.2610.4Networkindependentclocking.2610.4.1NetworkIndependentClockingforTCH/F14.4channelcoding(bothsingle-andmultilinks).2610.4.1.1Negativecompensation.2610.4.1.2Positivecompensation.2610.5PaddingTCH/FframeswhentheAIURisnotamultipleof9,6or4,8kbit/s.2710.5.1PaddingforTCH/F14.4channelcoding.2711SupportofNon-TransparentBearerServices.2711.1Supportofnon-transparentoperationforTCH/F9.6andTCH/F4.8channelcodings.2711.2Supportofnon-transparentoperationforTCH/F14.4channelcoding.2812FiguresonFramestructures.28AnnexA(informative):Stacksofrateadaptation.33A.1Stacksofrateadaptationfor9,6/4,8kbit/ssingleslotoperation.33A.2Stacksofrateadaptationfor14,4kbit/ssingleslotoperation.34A.3Stacksofrateadaptationfor9,6/4,8kbit/smultislotoperation.36A.4Stacksofrateadaptationfor14,4kbit/smultislotoperation.37AnnexB(informative):AnexampleofmappingNetworkIndependentClockinginformationforTCH/F14.4whentheS-interfaceisdeployed:.39AnnexC(informative):Changehistory.40History.41SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)5(GSM04.21version7.0.3Release1998)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)hasbeenproducedbyTechnicalCommitteeSpecialMobileGroup(SMG).ThepresentdocumentdefinestherateadaptationfunctionstobeusedinMobileStations(MS)foradaptingterminalinterfacedataratestotheMobileStation-BaseStationSystem(MS-BSS)interfacedatarateswithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocument,itwillbere-releasedbySMGwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7IndicatesGSMPhase2+Release1998;xtheseconddigitisincrementedfortechnicalenhancements,corrections,updates,etcythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification;NationaltranspositiondatesDateofadoptionofthisEN:3December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)6(GSM04.21version7.0.3Release1998)1ScopeThepresentdocumentdefinestherateadaptationfunctionstobeusedinGSMPLMNMobileStations(MS)sforadaptingterminalinterfacedataratestotheMobileStation-BaseStationSystem(MS-BSS)interfacedataratesinaccordancewithGSM03.10[3].Theprovisionofthesefunctionswilldependontheservicesaparticularstationisdesignedtosupport.NOTE:ThepresentdocumentshouldbeconsideredtogetherwithGSM08.20[9](RateAdaptationontheBSS-MSCInterface)togiveacompletedescriptionofPLMNrateadaptation.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:"Digitalcellulartelecommunicationsystem(Phase2+);Abbreviationsandacronyms".[2]GSM02.34:"Digitalcellulartelecommunicationssystem(Phase2+);HighSpeedCircuitSwitchedData(HSCSD)-Stage1".[3]GSM03.10:"Digitalcellulartelecommunicationsystem(Phase2+);GSMPublicLandMobileNetwork(PLMN)connectiontypes".[4]GSM03.34:"Digitalcellulartelecommunicationssystem(Phase2+);HighSpeedCircuitSwitchedData(HSCSD)-Stage2ServiceDescription".[5]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[6]GSM07.01:"Digitalcellulartelecommunicationsystem(Phase2+);GeneralonTerminalAdaptationFunctions(TAF)forMobileStations(MS)".[7]GSM07.02:"Digitalcellulartelecommunicationssystem(Phase2+);TerminalAdaptationFunctions(TAF)forservicesusingasynchronousbearercapabilities".[8]GSM07.03:"Digitalcellulartelecommunicationssystem(Phase2+);TerminalAdaptationFunctions(TAF)forservicesusingsynchronousbearercapabilities".[9]GSM08.20:"Digitalcellulartelecommunicationsystem(Phase2+);RateadaptionontheBaseStationSystem-Mobile-servicesSwitchingCentre(BSS-MSC)interface".[10]CCITTRecommendationV.110:"Supportofdataterminalequipments(DTEs)withV-Seriesinterfacesbyanintegratedservicesdigitalnetwork".[11]CCITTRecommendationX.30:"SupportofX.21,X.21bisandX.20bisbasedterminalequipments(DTEs)byintegratedservicesdigitalnetwork(ISDN)".SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)7(GSM04.21version7.0.3Release1998)2.1AbbreviationsanddefinitionsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.Overalldatastream:Thedatastreaminthosepartsofthenetworkwherethedataflowisnotsplitintomultiplechannels.Substream:Streamofdatawithexplicitorimplicitnumberingbetweensplitterandcombinerfunctions.Channel:Aphysicalfullratechannelontheradiointerface(TCH/F)independentofthecontentsMultislotintermediaterate:Intermediateratepersubstreaminthosepartsofthenetworkwheretheoveralldatastreamissplitintosubstreams.Intermediaterate:Intermediaterateintheoveralldatastream.Substreamrate:Theuserrateincludingpadding,ifapplicable,ononeindividualsubstream.3GeneralapproachGSM03.10definesthePLMNconnectiontypesnecessarytosupporttheGSMPLMNdataandtelematicservices.WithintheMSthereareseveraldifferentdatarateadaptationfunctions-andaSplit/Combine-functionincaseofamultislotdataconfiguration-whicharecombinedasshowninGSM03.10aspartoftheconnectiontype.TherateadaptationfunctionsareRA0,RA1,RA2,RA1',RA1''andRA1/RA1'.TheRA0,RA1andRA2areequivalenttothosefunctionsdescribedinCCITTrecommendationV.110[11].TheRA1'functionissimilartoRA1buthasareducedbitrateoutputcompatiblewiththecodingschemeproposedfordataservicesontheradiointerface.TheRA1''functionisusedforconvertingbetweensynchronoususerratesof48and56kbit/sandtherate64kbit/s.TheequivalentfunctioninCCITTrecommendationV.110doesnothaveaname.TheRA1/RA1'isarelayfunction,usedasindicatedinGSM03.10.Inmultislotdata-configurationstheoveralldatastreamissplitintoparallelsubstreamsbetweentheSplit/Combine-functions.3.1OverviewofdataratesandconfigurationsInTable1,anoverviewofthesupportedtransparentair-interfaceuserratesisgiven.Foreachrate,alsointermediateratesperchannelbetweenBTSandMSC,overallradiointerfacerates,andchannelconfigurationsaregiven.Forsingleslotconnectionstheintermediateratesareperchannelcarryingtheoveralldatastream,whereasformultislotconnections,theintermediateratesarepersubstream.InTable2,intermediaterateswithintheMS,overallradiointerfacerates,andchannelconfigurationsaregivenfortheair-interfaceuserrates.Theintermediateratesareperoveralldatastream.Forsingleslotratesupto4,8kbit/s,theusedintermediaterateis8kbit/s,andforthe9,6kbit/ssingleslotrate16kbit/s.ForTCH/F9.6andTCH/F4.8channelcodings,themultislotintermediateratesare16and8kbit/sperTCH/F,respectively.ForTCH/F14.4channelcoding,themultislotintermediaterateis16kbit/sperTCH/F.BetweentheTEandtheSplit/Combine-functionattheMS,wheretheoveralldatastreamisnotsplit,intermediateratesof8,16,32and64kbit/sareapplicableSIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)8(GSM04.21version7.0.3Release1998)Table1:AIUR/MultislotintermediateratesAirinterfaceuserrateDTE/DCEstatusesRA0RA1'/RA1RA1'/RAA'RA1'MultislotintermediaterateFrametypeRadiointerfaceratePadding≤600bit/sXX8kbit/s80bitframes3,6kbit/s1200bit/sXX8kbit/s80bitframes3,6kbit/s2,4kbit/sXX8kbit/s80bitframes3,6kbit/s4,8kbit/sXX8kbit/s80bitframes6kbit/s9,6kbit/sXX16kbit/sor2×8kbit/s80bitframes12kbit/sor2×6kbit/s14,4kbit/sXX2×16kbit/sor3×8kbit/s80bitframes2×12kbit/sor3×6kbit/sP(note1)16kbit/sNote7Note814,5kbit/s19,2kbit/sXX2×16kbit/sor4×8kbit/s80bitframes2×12kbit/sor4×6kbit/s28,8kbit/sXX3×16kbit/s80bitframes3×12kbit/s2x16kbit/sNote7Note82×14,5kbit/s38,4kbit/sXX4×16kbit/s80bitframes4×12kbit/sP(note6)3x16kbit/sNote7Note83×14,5kbit/s48kbit/sXNote2Note25×12kbit/sP(note6)4x16kbit/sNote7Note84×14,5kbit/s56kbit/sNote2Note25×12kbit/s(note3)P(note6)4x16kbit/sNote7Note84×14,5kbit/s64kbit/sNote2Note26×12kbit/s(note3)P(note1)5×14,5kbit/s(note6)P=PaddingusedSIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)9(GSM04.21version7.0.3Release1998)Table2:AIUR/IntermediateratesAirinterfaceuserrateDTE/DCEstatusesRA0RA1RA1'IntermediaterateFrametypeRadiointerfaceratePadding≤600bit/sXX8kbit/s80bitframes3,6kbit/s1200bit/sXX8kbit/s80bitframes3,6kbit/s2,4kbit/sXX8kbit/s80bitframes3,6kbit/s4,8kbit/sXX8kbit/s80bitframes6kbit/s9,6kbit/sXX16kbit/s80bitframes12kbit/sor2×6kbit/s14,4kbit/sXX32kbit/s80bitframes2×12kbit/sor3×6kbit/s1x14,5kbit/sP(note1)19,2kbit/sXX32kbit/s80bitframes2×12kbit/sor4×6kbit/s28,8kbit/sXX64kbit/s80bitframes3×12kbit/s2×14,5kbit/s38,4kbit/sXX64kbit/s80bitframes4×12kbit/s3×14,5kbit/sP(note6)48kbit/sXNote4Note45×12kbit/s4×14,5kbit/sP(note6)56kbit/sNote4Note45×12kbit/s(note3)4×14,5kbit/sP(note6)64kbit/sNote5Note56×12kbit/s(note3)5×14,5kbit/sP(note1)(note6)P=PaddingusedNOTE1:Forinformationonthepaddingprocedure,pleaserefertoclause10ofthepresentdocument.NOTE2:Nomultislotintermediaterate;substreamscombinedattheBSS.NOTE3:AIUR11,2kbit/sperchannelNOTE4:ForthisrateGSM-specificrateadaptationfunctionRA1''ratherthanRA1isapplied.NOTE5:ForthisrateRA1-andRA2-adaptationsarenotapplied.NOTE6:PaddingusedasspecifiedforTCH/F14.4channelcodingsNOTE7:Atthenetworkside,RA1'/RA1notapplied;insteadaTCH/F14,4-specificadaptationRA1'/RAA'used(GSM08.20)NOTE8:A320-bitframeformatdescribedinGSM08.60.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)10(GSM04.21version7.0.3Release1998)4TheRA0Function4.1Asynchronous-to-SynchronousConversion(RA0)TheRA0Functionisonlyusedwithasynchronousinterfaces.Incomingasynchronousdataispaddedbytheadditionofstopelementstofitthesameornearesthighersynchronousratedefinedby2tothepowern(wheren≤6)times600bit/s,14,4kbit/sor28,8kbit/s.Thusboth75bit/sand300bit/suserdatasignallingratesshallbeadaptedtoasynchronous600bit/sstream.TheresultantsynchronousstreamisfedtoRA1orRA1'.TheRA0usedinGSMisnotidenticaltothatdescribedinITU-TRecommendationV.110whichconverts14,4and28,8kbit/suserratesto19,2and38,4kbit/s,respectively.AsynchronoususerrateSynchronoususerrate≤0.6kbit/s0.6kbit/s1,2kbit/s1,2kbit/s2,4kbit/s2,4kbit/s4,8kbit/s4,8kbit/s9,6kbit/s9,6kbit/s14,4kbit/s14,4kbit/s19,2kbit/s19,2kbit/s28,8kbit/s28,8kbit/s38,4kbit/s38,4kbit/s4.2BreaksignalTheRA0shalldetectandtransmitthebreaksignalinthefollowingfashion:Iftheconverterdetects2Mto2M+3bits,allofstartpolarity,whereMisthenumberofbitspercharacterintheselectedformatincludingstartandstopsbits,theconvertershalltransmit2M+3bitsofstartpolarity.Iftheconverterdetectsmorethan2M+3bitsallofstartpolarity,theconvertershalltransmitallthesebitsasstartpolarity.The2M+3ormorebitsofstartpolarityreceivedfromthetransmittingsidesshallbeoutputtothereceivingterminal.Theterminalmusttransmitoncircuit103atleast2Mbitsstoppolarityafterthestartpolaritybreaksignalbeforesendingfurtherdatacharacter.Theconvertershallthenregaincharactersynchronismfromthefollowingstoptostarttransition.4.3Overspeed/UnderspeedARA0shallinsertadditionalstopelementswhenitsassociatedterminalistransmittingwithalowerthannominalcharacterrate.Iftheterminalistransmittingcharacterswithanoverspeedofupto1%,theasynchronous-to-synchronousconvertermaydeletestopelementsasoftenasisnecessarytoamaximumofoneforeveryeightcharactersat1%overspeed.Theconverteronthereceivingsideshalldetectthedeletedstopelementsandreinserttheminthereceiveddatastream(circuit104).Therealizationofoverspeedhandling,asdescribedabove,attheinterfacetotheassociatedterminalisimplementationdependent.Possibleimplementationsaree.g.thereductionofthelengthofthestopelementsaccordingtoV.110[9]orincreaseddataratesbetweentheTAandterminal.4.4ParityBitsPossibleparitybitsincludedintheuserdataareconsideredasdatabitsbytheRA0function(andRA1function).SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)11(GSM04.21version7.0.3Release1998)4.5FlowControlWhereapplicable,thisfunctionisasspecifiedintherelevantterminaladaptationfunctionSpecification(seeGSM07series).5TheRA1FunctionThisfunctionisusedtoadaptbetweenthesynchronoususerrates,ortheoutputoftheRA0functionandtheintermediaterateof8,16,32or64kbit/s.5.1Adaptationofsynchronousdataratesupto38,4kbit/sSynchronoususerrateIntermediaterate≤2,4kbit/s8kbit/s4,8kbit/s8kbit/s9,6kbit/s16kbit/s14,4kbit/s32kbit/s19,2kbit/s32kbit/s28,8kbit/s64kbit/s38,4kbit/s64kbit/sACCITTV.11080bitsframeisconstructedusingtheuserdatabitsreceived(fromtheRA0intheasynchronouscase),thevaluesoftheSbitsarededucedfromtheRinterface.Adaptationof600bit/sto8Kbit/sisperformedby8timesconsecutiveduplicationofeachuserdatabit.(Figure9)Adaptationof1200bit/sto8Kbit/sisperformedby4timesconsecutiveduplicationofeachuserdatabit.(Figure8)Adaptationof2400bit/sto8kbit/sisperformedby2timesconsecutiveduplicationofeachuserdatabit.(Figure7)Adaptationof4800bit/sto8Kbit/sisperformedbytransmittingthebitstreamwithnoduplication.(Figure3)Adaptationof9600bit/sto16Kbit/sisperformedbytransmittingthebitstreamwithnoduplication(theemittingperiodishalvedwithrespecttothe4800bit/scase).(Figure3)Adaptationof14400bit/sto32Kbit/sisperformedasfor3600bit/sto8kbit/s(theemittingperiodisdividedbyfourwithrespecttothe3600bit/scase).(Adaptationof3600bit/sto8kbit/sisperformedbytransmittingthebitstreamwithnoduplication.)(Figure12)Adaptationof19200bit/sto32Kbit/sisperformedasfor4800bit/sto8kbit/s(theemittingperiodisdividedbyfourwithrespecttothe4800bit/scase).(Figure3)Adaptationof28800bit/sto64Kbit/sisperformedasfor3600bit/sto8kbit/s(theemittingperiodisdividedbyeightwithrespecttothe3600bit/scase).(Figure12)Adaptationof38400bit/sto64Kbit/sisperformedasfor4800bit/s8kbit/s(theemittingperiodisdividedbyeightwithrespecttothe4800bit/scase).(Figure3)TheCCITTV.11080bitframesshowninFigures3and12areused.TheDbitsareusedtoconveytheuserdataandtheSandXbitsareusedtoconveychannelcontrolinformationaccordingtoGSM07.01.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)12(GSM04.21version7.0.3Release1998)TheEbitsareusedtoconveythefollowinginformation:i)UserDataRate-E1,E2,E3(forsingleslotoperationseeFigure4,andformultislotoperationFigure4andsubclause10.7)ii)NetworkIndependentClocking-E4,E5,E6iii)MultiframeSynchronisation-E7Theorderoftransmissionofthe80bitframeisfromlefttorightandtoptobottom.5.1.1NetworkIndependentClockingSynchronousdatasignalsreceivedbytheMTfromtheDTEattheMSorbyIWFfromthemodemonthePSTNmaynotbesynchronizedtothePLMN.ThefollowingmethodshallbeusedtoenabletransferofthosedatasignalsandthecorrespondingbittiminginformationviatheV.110frames.SuchasituationwouldexistwherethesignalsreceivedfromthemodemattheIWFrequireitsownclockorwherethesignalsreceivedfromtheDTEattheMSemploysitsownnetworkindependentclock.Inanycase,thefrequencytoleranceoftheclocksinvolvedis100ppm.5.1.1.1MultiframeStructureThetransmittingendoftheGSMPLMNconnectionshallestablishamultiframestructureutilizingbitE7consistingoffourframesbysettingE7ineveryfourthframetobinary0.ThisstructureisidenticaltotheuseofE7inV.110(andX.30)exceptthatsuchamultiframestructurewillexistforalluserdatarates.ThisframesynchronizationwillbeachievedandmaintainedduringtheentirecallsothatcorrectionsforthenetworkindependentclockingbythereceivingendoftheGSMPLMNconnectioncanbeeasilyrecognizedandappliedbasedonthecodewords(inc1,c2,c3,c4andc5)positionedinbitsE4,E5andE6oftwoconsecutiveV.110framesasillustratedinfigure1.Thus,themultiframestructureallowsforone5-bitcodewordstobetransmittedeverytwoV.110framesforthepurposesofnetworkindependentclocking.Thetwocode-wordsmaybedifferentfromeachotherwithinthemultiframeshowninfigure1.FrameE4E5E6E7MF0ac1c210MF1ac3c4c51MF0bc1c211MF1bc3c4c51Figure1:NICMultiframeStructureOnceMultiframesynchronizationisachieved,eachcodewordisindependentlyevaluatedtodeterminethecompensationneeded,ifany.Thecompensationisappliedasexplainedinsection3.1.2inV.110framesMF1aandMF1b.5.1.1.2EncodingandcompensationTheV.110transmitterwillusethefollowing5-bitcodewords,asshowninfigure2,toindicatethefourpossiblestatesofcompensationrequiredfornetworkindependentclocking.c1c2c3c4c5Nocompensation11111Negativecompensation10010Positivecompensationofazero01001Positivecompensationofone00100Figure2:NICCodeWordsWhennegativecompensationisindicated,onelessuserdatabitthannormalistransportedintheaffectedframe(MF1aorMF1b).AnegativecompensationshallcausethereceivertodeletetheuserdatabitoccupiedbybitpositionD25,sincethetransmittersetsthistobinary1anddoesnotutilizethispositionforuserdata.Atthoseuserdatarateswheretheuserdatabitisrepeated,allcopiesofD25shallbediscarded.Incaseof80-bitframeswith36databits,bitD19isdiscardedinstead.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)13(GSM04.21version7.0.3Release1998)Whenapositivecompensationisindicated,oneadditionaluserdatabitistransferredbymeansofthecodeword.Atthereceiver,apositivecompensationwillcauseauserdatabitofbinaryvalue0or1,asindicatedbythecodeword,tobeinsertedbetweentheuserdatabitscarriedinbitpositionsD24andD25(inMF1aorMF1b)oftheV.110frameillustratedinfigure3.Incaseof80-bitframeswith36databits,theinsertionisdonetobetweenbitsD18andD19.Whennocompensationisnecessary,orwhenNICisapplied,thevaluesofE4,E5,E6,E7,onthe4multiframeschemeis:FrameE4E5E6E7MF0a1110MF1a1111MF0b1111MF1b1111WhenNICisnotapplicable,theMSandtheIWFshalldisregardthereceivedvalueofbitsE4,E5,E6andE7inthedatatransmissionphase.NOTE:NICisnotapplicableinthefollowingcases:-transparentasynchronousbearerservices;-thefacsimileteleservicesinthetransparentmode;-everytransparentbearerserviceswheninterworkingwithanUDIInformationTransferCapability.6TheRA1''functionTheRA1''functionisusedforconvertingbetweensynchronoususerratesof48and56kbit/sandthe'intermediate'rateof64kbit/s.(RA1''isaGSM-specifictermwhichisusedfortheone-stepadaptationof48and56kbit/sratesinto64kbit/sasspecifiedinITU-TV.110.ForthepurposesofGSMspecificationstheterm'intermediaterate'isusedfortheresulting64kbit/sratealthoughthisisnotdoneinV.110recommendation.)6.1Rateadaptationof48kbit/suserrateswithDTE/DCEstatusto64kbit/sACCITTV.11032bitsframeisconstructedusingtheuserdatabitsreceived,thevaluesoftheSbitsarededucedfromtheRinterface.TheCCITTV.11032bitframeshowninFigure13isused.TheDbitsareusedforconveyingtheuserdataandtheSandXbitsareusedforconveyingchannelcontrolinformationaccordingGSM07.01.Theorderoftransmissionofthe32bitframeisfromlefttorightandtoptobottom.6.2Rateadaptationof56kbit/suserrateto64kbit/sACCITTV.11064bitsframeisconstructedusingtheuserdatabitsreceived.TheCCITTV.11064bitframeshowninfigure14isused.TheDbitsareusedforconveyingtheuserdata.Theorderoftransmissionofthe64bitframeisfromlefttorightandtoptobottom.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)14(GSM04.21version7.0.3Release1998)7TheRA2FunctionThisprocedureisbasedontheRA2functionasspecifiedinCCITTV.110.Itisusedtorateadaptto/fromtheintermediateratesof8,16or32kbit/sfrom/tothe64kbit/srateusedattheSinterface.IntermediaterateRateattheSinterface8kbit/s64kbit/s16kbit/s64kbit/s32kbit/s64kbit/s64kbit/s64kbit/sFortheintermediate-anduserdatarateof64kbit/s,theRA2transmitsthebitstreamovertheS-interfaceasitis.Itconsidersthe64kbit/sstreamovertheS-interfacetoconsistofoctets,bits1through8,withbit1beingtransmittedfirst.Theprocedurerequiresthat:i)The8kbit/sstreamoccupiesbitposition1;ii)The16kbit/sbitstreamoccupiesbitpositions(1,2);iii)The32kbit/sbitstreamoccupiesbitpositions(1,2,3,4);iv)Theorderoftransmissionofthebitsofthesubratestreamisidenticalbeforeandafterrateadaptation.v)Allunusedbitsinthe64kbit/sstreamaresettobinary"1".8TheRA1/RA1'FunctionTheRA1/RA1'functionisusedintransparentcasestoconvertbetweentheintermediaterateandtheinputratetothechannelcoderfunctionfortransmissionovertheradiointerface.Thisconversionalsoappearsontheinfrastructuresideinbothtransparentandnon-transparentcasesasspecifiedinGSM08.20exceptforTCH/F14.4.8.1SingleslotratesIntermediaterateRadiointerfacerate8kbit/s3,6kbit/s8kbit/s6kbit/s16kbit/s12kbit/s32kbit/s14,5kbit/sTherearefourdatarates(knownasRadioInterfacerates)usedfordatatransfertothechannelcoder.Theseare14,5kbit/s,12kbit/s,6kbit/sand3.6kbit/s,andinordertoadaptthe8,16,and32kbit/sintermediateratestothesedatarates,threeprocessesareused.Firstlythe17synchronizationbitsareremoved.SecondlytheE1,E2andE3bitsareremoved.Fortransparentservices,thevaluesoftheE1,E2,E3bitsaredeterminedattheMTandincaseofTCH/F9.6andTCH/F4.8,attheBTSbasedontheindicationgivenbyoutbandsignalling(eitherintheUserRatefieldoftheBC-IEoftheSETUPmessagefortheMTorintheChannelTypeinformationintheASSIGNMENTREQUESTmessagefortheBSS).Fornontransparentservices,thecodingoftheE1,E2andE3bitsisdescribedinGSM08.20.Thirdly,inthe3.6kbit/scase,halfthedatabitsarediscarded.TheseprocessesresultinmodifiedCCITTV.110framesofsizes60,60and36bitsforthe12,6and3.6kbit/sdataratesrespectively.TheresultantmodifiedCCITTV.110framesforthevarioususerdataratesareshowninfigures5-9.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)15(GSM04.21version7.0.3Release1998)FurtherproceduresforTCH/F14.4channelcoderinputrateinsubclause8.1.1.8.1.1Radiointerfacerateof14,5kbit/sInthiscaseonemodifiedCCITTV.110frameisreceived/sentfrom/tothenetworkevery2.5ms(seeGSM05.03).TheRA1/RA1'functionadds/subtractsthe17-bitsynchronisationpattern,theF-,E-,X-,andS-bitsto/fromthe80-bitV.110-frames.BitsM1andM2aretransmittedalongwiththemodified36-bitV.110framesevery20msovertheradiointerface(SeeGSM05.03).BitM2isusedbytheRA1/RA1'-functionforderiving/mappingtheE-,S-,andX-bits.BitM1isusedformultislotsynchronisation.Theusageofthesebitsisfurtherelaboratedinsubclause8.1.1.1.ThemodifiedCCITTV.11036-bitframereceived/sentfrom/tothenetworkat14,4kbit/s:D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D36isconverted/derivedinto/fromthefollowing80-bitV.110-frameat32kbit/s.TheE-,S-,andX-bitsaremapped/extractedto/fromtheM2-bitsequence.000000001D1D2D3D4D5D6S11D7D8D9D10FFX1D11D12FFD13D14S31FFD15D16D17D18S41E1E2E3E4E5E6E71D19D20D21D22D23D24S61D25D26D27D28FFX1D29D30FFD31D32S81FFD33D34D35D36S9Forthe36-bitframesthereceivedD-bitsaresetastheyweretransmitted.FortransparentservicesE,S,andX-bitsarereproducedbasedontheM2-bitsequenceasdescribedinsubclause8.1.1.1.BitsE1,E2,andE3aresetaccordingtotheuserdatarateasshowninFigure4fortransparentservices.8.1.1.1Multiframestructureovertheradio-interfaceBitM1carriesa31-bitPNmultiframecode0000100101100111110001101110101.Onemultiframebitistransmittedevery20ms,whichmeansthatonewholemultiframeconsistsof24836-bit2.5msframes.BitM2carriesV.24circuitstatusinformation,networkindependentclocking(NIC)informationandsubstreamnumberingasindicatedinthefollowingfigure:bitnumber012345678-1112-1516-1920-2324-2728-30M1:0000100101100111110001101110101M2:###SBSBX###XSBSB###SBSBX###XSBSBNNNNNSBSBwhere###=Substreamnumber(multilinkoperation)SB=theSBstatusbitX=theX-statusbitNNNNN=NetworkindependentclockingcodeIntheMStoNetworkdirectiontheinformationcarriedbytheM2-bitsequenceismappedinthefollowingmanner:SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)16(GSM04.21version7.0.3Release1998)AnM1/M2-bitpairistransmittedalongeachblockofdatacontainingeightmodifiedV.11036-bitframes.Thethree-bit#-sequencecarriesanumberidentifyingeachsubstream(multislotoperation);thesubstreamsarenumbered0,1,2etc.Thestatus-andNIC-informationismappedbetweentheM2-sequence(s)andtheV.110-frames.BitsSBandXaremappedtoV.24circuitsasspecifiedinGSM07.01.TheSB-bitcarriestheV.110SB-statusinformation,andtheX-bittheX-statusinformation.FiveconsecutiveN-bitscarryinganNIC-codeintheM2-sequenceindicate'negativecompensation'or'positivecompensation'ifsuchacompensationisrequired.Otherwise'nocompensation'isindicatedbytheN-bits.N-bit24inM2-sequenceN-bit25inM2-sequenceN-bit26inM2-sequenceN-bit27inM2-sequenceN-bit28inM2-sequenceNocompensation11111Negativecompensation10010Positivecompensationofazero01001Positivecompensationofaone00100TheNetworktoMSdirection:Thestatus-informationisfilteredasdescribedinGSM07.01.TochangetheSB-orX-statusmode,itisrequiredthatatleasttwoconsecutiveSB-orX-bits,respectively,carrythesamevalue.ForNIC-procedure,refertosubclause10.5.1.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)17(GSM04.21version7.0.3Release1998)8.1.1.2Radio-interfacedatablockforTCH/F14.4channelcodingAradio-interfacedatablockforaTCH/F14.4channelconsistsof836-bitdataframesandbitsM1andM2asshowninthefollowingtable:M1M21D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D362D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D363D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D364D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D365D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D366D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D367D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D368D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D28D29D30D31D32D33D34D35D36Thenumberontheleftindicatestheorderofthedataframesinthe290-bitblock;the36-bitframeinpositiononewasreceivedbeforethatinpositiontwoetc.Onesuchblockistransmittedovertheradiointerfaceevery20ms.8.1.2RadioInterfacerateof12kbit/sInthiscaseonemodifiedCCITTV.11060bitframeisreceived/sentfrom/tothenetworkevery5ms(seeGSM05.03).TheRA1/RA1'functionwilladd/subtractthe17bitsynchronizationpatternandtheE1,E2andE3bitsto/fromeachCCITTV.11080bitframeasfollows:ThemodifiedCCITTV.11060bitsframereceived/sentfrom/totheradiointerfaceat12Kbit/s,D1D2D3D4D5D6S1D7D8D9D10D11D12XD13D14D15D16D17D18S3D19D20D21D22D23D24S4E4E5E6E7D25D26D27D28D29D30S6D31D32D33D34D35D36XD37D38D39D40D41D42S8D43D44D45D46D47D48S9SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)18(GSM04.21version7.0.3Release1998)isconvertedintothefollowingaCCITTV.11080bitsframeat16Kbit/s:000000001D1D2D3D4D5D6S11D7D8D9D10D11D12X1D13D14D15D16D17D18S31D19D20D21D22D23D24S41E1E2E3E4E5E6E71D25D26D27D28D29D30S61D31D32D33D34D35D36X1D37D38D39D40D41D42S81D43D44D45D46D47D48S9Inthecaseofthenontransparentservices,bitsS1,X,S3,S4,E4,E5,E6,E7,S6,X(secondoccurrence),S8,andS9carrybitsD'1,D'2,D'3,D'4,D'5,D'6,D'7,D'8,D'9,D'10,D'11,andD'12,respectively.ForamodifiedCCITTV.11060bitframesreceivedfromthenetwork,thereceivedD,SandXbitsorDandD'bitsaresettothesamevalueasthetransmittedbits.BitsE1,E2,E3aresetaccordingtotheuserdatarateasshowninfigure4forthetransparentservices,ortheRLPmultiframeandDTXindicationasperGSM08.20inthenontransparentcase.FormodifiedCCITTV.11060bitframestransmittedoverthenetwork,thereceivedD,S,andXbitsorDandD'aresettothesamevalueasthetransmittedbits.BitsE1,E2,E3arediscarded.8.1.4RadioInterfacerateof6kbit/sInthiscaseonemodifiedCCITTV.11060bitframeisreceived/sentfrom/tothenetworkevery10ms(seeGSM05.03).TheRA1/RA1'functionwilladd/subtractthe17bitsynchronizationpatternandtheE1,E2andE3bitsto/fromeachCCITTV.11080bitframeasfollows:ThemodifiedCCITTV.11060bitsframereceived/sentfrom/totheradiointerfaceat6Kbit/s,D1D2D3D4D5D6S1D7D8D9D10D11D12XD13D14D15D16D17D18S3D19D20D21D22D23D24S4E4E5E6E7D25D26D27D28D29D30S6D31D32D33D34D35D36XD37D38D39D40D41D42S8D43D44D45D46D47D48S9isconvertedintothefollowingaCCITTV.11080bitsframeat8Kbit/s:000000001D1D2D3D4D5D6S11D7D8D9D10D11D12X1D13D14D15D16D17D18S31D19D20D21D22D23D24S41E1E2E3E4E5E6E71D25D26D27D28D29D30S61D31D32D33D34D35D36X1D37D38D39D40D41D42S81D43D44D45D46D47D48S9Inthecaseofthenontransparentservices,bitsS1,X,S3,S4,E4,E5,E6,E7,S6,X(secondoccurrence),S8,andS9carrybitsD'1,D'2,D'3,D'4,D'5,D'6,D'7,D'8,D'9,D'10,D'11,andD'12,respectively.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)19(GSM04.21version7.0.3Release1998)ForamodifiedCCITTV.11060bitframesreceivedfromthenetwork,thereceivedD,SandXbitsorDandD'bitsaresettothesamevalueasthetransmittedbits.BitsE1,E2,E3aresetaccordingtotheuserdatarateasshowninfigure4forthetransparentservices,ortheRLPmultiframeandDTXindicationasperGSM08.20inthenontransparentcase.FormodifiedCCITTV.11060bitframestransmittedoverthenetwork,thereceivedD,S,andXbitsorDandD'bitsaresettothesamevalueasthetransmittedbits.BitsE1,E2,E3arediscarded.Itshouldbenotedthatthisprocessisidenticaltothatusedforthe12kbit/scaseexceptthattheframerepetitionratesarehalved.8.1.5RadioInterfacerateof3,6kbit/s(transparentservicesonly)InthiscaseonemodifiedCCITTV.11036bitframeisreceived/sentfrom/tothenetworkevery10ms(seeGSM05.03[3]).TheRA1/RA1'functionwilladd/subtractthe17bitsynchronizationpatternandtheE1,E2andE3bitsto/fromeachCCITTV.11080bitframeasfollows:ThemodifiedCCITTV.11036bitsframereceived/sentfrom/totheradiointerfaceat3.6Kbit/s,D1D2D3S1D4D5D6XD7D8D9S3D10D11D12S4E4E5E6E7D13D14D15S6D16D17D18XD19D20D21S8D22D23D24S9isconvertedintothefollowingaCCITTV.11080bitsframeat8Kbit/s:000000001D1D1D2D2D3D3S11D4D4D5D5D6D6X1D7D7D8D8D9D9S31D10D10D11D11D12D12S41E1E2E3E4E5E6E71D13D13D14D14D15D15S61D16D16D17D17D18D18X1D19D19D20D20D21D21S81D22D22D23D23D24D24S9FormodifiedCCITTV.11036bitframestransmittedtothenetwork,E1,E2,E3arediscarded.FormodifiedCCITTV.11036bitframesreceivedfromthenetwork,E1,E2,E3aresetasshowninfigure2.NOTE:Theactiontobetakeninthecasewheretwobitswhichshouldhavethesamevalue(e.g.bitsnotedD1arereceivedwithdifferentvaluesisforfurtherstudy.8.1.6SynchronisationTwointerfacesareinvolvedintheTAFregardingtheneedfordataframesynchronisation,i.e.theTAF/air-interfaceandTAF/TEinterface.FordetaileddefinitionofthesynchronisationproceduresrefertoGSM07.01.8.1.7IdleframesWhenevernodataisreceivedfromtheradiointerface(e.g.framestealingapplies,layer2fillframesarereceived,etc.)idleframesshallbesenttotheDTE.TheseareV.110frameswithframealignmentpatternaccordingtoCCITTrecommendation.V.110[11]andalldata,statusandE-bitssettobinary"1".8.2MultislotratesInmultislotoperationthetransmissionisperformedusingparallelsubstreamsbetweentheSplit/Combine-functions.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)20(GSM04.21version7.0.3Release1998)8.2.1TCH/F14.4multislotoperationTheinformationcarriedbytheM2-sequencesisreadpersubstream;i.e.thesubstreamnumberandacompleteNIC-codearetransferredthroughonesubstream.ANIC-codeiscarriedonasmanysubstreamsasisnecessarytocoverallNIC-compensationsthathavetakenplace.OnchannelswherenoNIC-compensationiscarried,theN-bitsaresetto'nocompensation'.FortheexactNIC-procedures,refertosubclause10.5.1.8.2.2AIURsupto38,4kbit/susingTCH/F9.6andTCH/F4.8channelcodingsIntermediaterate/AIURRadiointerfacerate16kbit/s/9,6kbit/s2×6kbit/s32kbit/s/14,4;19,2kbit/s2×12or3×6or4×6kbit/s64kbit/s/28,8;38,4kbit/s3×12or4×12kbit/sInthesecases,thedatastreamismappedfrom80-bitintermediaterateframesintomodifiedframesof60bitsforradio-interfacetransmissionasspecifiedinsubclause8.1for12kbit/sand6kbit/sexceptforthefollowingcases:ForAIURs14,4and28,8kbit/susingchannelcodingsTCH/F4.8andTCH/F9.6,respectively,fourconsecutiveV.11080-bitframes(Figure12)aremappedontothreeconsecutivemodified60-bitV.110(Figure5or6)framesattheMS.The4×36databitsinthe80-bitframesaremappedontothe3×48databitsinthe60-bitframes.However,bitsE4-E7inthe80-bitframesaremappedontotheE4-E7bitsinthe60-bitframeswhentheirvalueindicateeitherpositiveornegativecompensation(NIC;Seesubclause5.1.1).TheE4-E7bitsthatindicate'Nocompensation'inthe80-bitframesneednotbemappedontothe60-bitframes.TheS-andX-bitsineveryfourth80-bitframearenotmappedontothe60-bitframes.Whenradiointerfacerateof2×12kbit/sisusedforcarryingAIUR14,4kbit/s,paddingisusedinthe60-bitframesofthehighersubstreamnumber(Subclause10.6).Forsubstreamnumberinginformation,pleaserefertosubclause10ofthepresentdocument.8.2.3AIURsupto38,4kbit/susingTCH/F14.4channelcodingIntermediaterate/AIURRadiointerfacerate64kbit/s/28,8;38,4kbit/s2×14,5or3×14,5ForAIURs14,4and28,8kbit/sthe36databitsinthe80-bitV.110intermediaterateframesareextractedandsentthroughthesubstreamsindatablockscontainingeight36-bitframesasdescribedinsubclause8.1.AnM1/M2-bitpairissentovertheradio-interfacealongwitheachdatablockevery20ms.Thesebitscarrythemultiframe,substreamnumber,V.24status,andNICinformationasdescribedinsubclauses8.1.1.1and8.2.1.ForAIUR38.4kbit/sthe80-bitV.110intermediaterateframescarry48userdatabits.The290-bitblocksinthesubstreamsofthelowersubstreamnumberscarry288userdatabitswhilethe290-bitblocksinthesubstreamofthehighestsubstreamnumbercarries192userdatabits;thismeansthatfiveoftheeight36-bitframesmakinguptheblockcarry36userdatabitswhereasthesixthframecarries12userdatabits(5×36+12).Framesseven,eight,andtherestofthesixthframearepaddedwith'1's.TheM2-bitsequencesareusedasdescribedinsubclauses8.1.1.1and8.2.1ForNIC-proceduresrefertosubclauses8.2.1and10.5.1.NoNIC-valuesaretransportedinassociationwithAIUR38,4;theN-bitsaresetto'nocompensation'.SIST EN 300 945 V7.0.3:2003
ETSIETSIEN300945V7.0.3(1999-12)21(GSM04.21version7.0.3Release1998)8.2.4AIURof48kbit/s;Intermediaterateof64kbit/s;Radiointerfacerateof5x12kbit/sOnemodifiedCCITTV.11060bitframe(Figure5)isreceived/sentfrom/toaTCH/Fev
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