SIST EN 300 959 V6.1.1:2003

• Abstract:

  CR@SMG#30bis

• 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
• Ref Project: ETSI EN 300 959 V6.1.1 (2000-06) - Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 6.1.1 Release 1997)

SIST EN 300 959 V6.1.1:2003 is the Slovenian adoption of ETSI EN 300 959 V6.1.1 for the GSM Phase 2+ digital cellular telecommunications system. It specifies the modulation format used by the GSM modulator, which takes bits from the encryption unit and produces the RF signal. The document is aimed at engineers and testers who need to implement or check GSM radio modulation behavior.

What does SIST EN 300 959 V6.1.1:2003 specify?

SIST EN 300 959 V6.1.1:2003 specifies the GSM modulation model at the radio path. It covers how bits are converted into the transmitted RF signal, while the detailed RF filtering tolerances are handled in GSM 05.05.

The document is organized into Clause 1 on references and abbreviations, Clause 2 on the modulation format, and informative Annex A on change control history. Clause 2 gives the mathematical model used for the modulator, so readers can trace the signal path from input bits to carrier phase.

What are the key requirements of SIST EN 300 959 V6.1.1:2003?

• Modulating bitrate - Clause 2.1 sets the modulating bitrate to 1625/6 kbit/s, about 270.833 kbit/s. In practice, the modulator timing has to match this rate so the transmitted waveform stays aligned with GSM symbol timing.

• Burst start and stop handling - Clause 2.2 says the modulator shall behave as if consecutive ones had entered the differential encoder before the first bit of the burst and after the last bit of the timeslot. This defines the dummy bits that mark the active and useful parts of the burst, which matters when implementing burst framing and phase continuity.

• Useful part of the normal burst - Clause 2.2 states that the useful part of a normal burst lasts for 147 modulating bits. This tells implementers which part of the burst carries the defined modulation behavior and where timing references are taken.

• Differential encoding - Clause 2.3 defines differential encoding using modulo-2 addition. In practice, the transmitted phase depends on bit transitions rather than absolute bit values, so the transmitter must preserve the defined previous-state relationship.

• Filtering model - Clause 2.4 defines the theoretical linear filter used to shape the modulating data values, with a rectangular pulse and an exponential response based on BT and the 3 dB bandwidth. The document gives the model, while the associated tolerances are in GSM 05.05, so implementers must use the specified theory and then check the separate RF requirements elsewhere.

• Output phase reference - Clause 2.5 sets the phase expression and the modulation index h at 1/2, with the phase reference t' = 0 at the start of the active part of the burst. This matters because the transmitter phase timeline is anchored to the burst structure, especially the first tail bit.

• RF carrier expression - Clause 2.6 gives the modulated RF carrier equation and states that the random phase ϕ0 is constant during one burst. This is the practical output model for the useful burst interval.

What terms does SIST EN 300 959 V6.1.1:2003 define?

• RF (Radio Frequency) - The radio carrier signal produced by the modulator and transmitted over the air interface.
• TDMA (Time Division Multiple Access) - The access method whose burst structure is used as the timing basis for the modulation model.
• Dummy bits - Artificial bits assumed before and after the burst so the differential encoder has a defined state at burst boundaries.
• Active part of the burst - The portion of the burst used as the timing reference for the phase definition.
• Useful part of the burst - The portion of the burst for which the modulation is defined as carrying the meaningful transmitted content.
• Differential encoder - The block that converts each input bit using modulo-2 addition with the previous state.
• Modulating index - The parameter h, set here to 1/2, that limits the maximum phase change per data interval.

Who uses SIST EN 300 959 V6.1.1:2003?

SIST EN 300 959 V6.1.1:2003 is used by GSM radio designers, baseband and modem engineers, and equipment makers working on Phase 2+ cellular systems. Test laboratories use it when checking burst timing, differential encoding, phase behavior, and the modulator model against GSM requirements. Quality and procurement teams use it to identify the exact modulation reference for GSM equipment and to align design and verification documents with the GSM radio interface.

What changed in SIST EN 300 959 V6.1.1:2003 from the previous edition?

Annex A records the version history leading to this edition. The listed changes include conversion to Release 97, a version update for publication, a correction of a mistake for the range of alpha-sub-i in Clause 2.3, and the upgrade to version 6.1.1 for publication.

Which standards are used with SIST EN 300 959 V6.1.1:2003?

• GSM 01.04 - Provides the abbreviations and acronyms used in the document.
• GSM 05.01 - Gives the general description of the physical layer on the radio path and is the reference for the encryption unit input to the modulator.
• GSM 05.02 - Defines multiplexing and multiple access on the radio path, including the burst structure used by the modulation clauses.
• GSM 05.05 - Covers radio transmission and reception, including the spectral purity and filter tolerances linked to the modulation model.

What does the SIST EN 300 959 V6.1.1:2003 document contain?

The document contains a mathematical description of GSM modulation rather than a procedural test method. Clause 2 includes the differential-encoding relationship, the theoretical filter model, the output phase equation, and the RF carrier expression. Figure 1 shows how the active part of the burst, the useful part, tail bits, and dummy bits relate to each other. Annex A provides the change control history, which helps readers track how the specification reached version 6.1.1.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 6.1.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 959 Version 6.1.1SIST EN 300 959 V6.1.1:2003en01-december-2003SIST EN 300 959 V6.1.1:2003SLOVENSKI
STANDARD
ETSIEN300959V6.1.1(2000-06)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Modulation(GSM05.04version6.1.1Release1997)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 959 V6.1.1:2003

ETSIETSIEN300959V6.1.1(2000-06)2(GSM05.04version6.1.1Release1997)ReferenceREN/SMG-020504Q6R1KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 959 V6.1.1:2003

ETSIETSIEN300959V6.1.1(2000-06)3(GSM05.04version6.1.1Release1997)ContentsIntellectualPropertyRights.4Foreword.41Scope.51.1References.51.2Abbreviations.52Modulationformat.52.1Modulatingbitrate.52.2Startandstopoftheburst.52.3Differentialencoding.62.4Filtering.62.5Outputphase.72.6Modulation.7AnnexA(informative):Changecontrolhistory.8History.9SIST EN 300 959 V6.1.1:2003

ETSIETSIEN300959V6.1.1(2000-06)4(GSM05.04version6.1.1Release1997)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)hasbeenproducedbytheSpecialMobileGroup(SMG).Thepresentdocumentspecifiest
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