Abstract

Upgrade to Release 1998 following CRs at SMG#28

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

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Standard

SIST EN 301 087 V7.2.1:2003

English language (143 pages)
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SIST EN 301 087 V7.2.1:2003 is the Slovenian standard identical to EN 301 087 Version 7.2.1, published by SIST. It specifies RF test methods and conformance requirements for GSM900 and DCS1800 Base Station Systems (BSS), including BTS and integrated BSS, so manufacturers, test laboratories and operators can assess radio performance in a consistent way.

What does SIST EN 301 087 V7.2.1:2003 specify?

SIST EN 301 087 V7.2.1:2003 covers the radio aspects of Base Station System equipment for the GSM Phase 2 and Phase 2+ family. It tells readers what to test, how to test it, and how to interpret the result for essential conformance and complete conformance.

The document is organized into clauses for definitions, general test conditions, test format, transmitter tests, receiver tests, radiated spurious emissions, and radio link management. Its annexes support the test methods with statistics, special equipment, sample counts, and change history.

AnnexWhat it covers
Annex AStatistical testing for parameters such as BER, RBER and FER
Annex BSpecial test equipment, including BSSTE and intermodulation setups
Annex CNumber of samples needed for statistical testing for GSM900 and DCS1800
Annex DChange history

What are the key requirements of SIST EN 301 087 V7.2.1:2003?

SIST EN 301 087 V7.2.1:2003 requires manufacturers to declare the supported band, the supported frequency range, the rated maximum power per TRX, and any optional functions such as Slow Frequency Hopping (SFH), RF power control and downlink DTX. In practice, this fixes the test configuration before measurements start, so the same equipment can be tested and accepted in the same way by different parties.

Clause 4 sets the common test conditions. It defines normal and extreme test environments, measurement uncertainty handling, and how to choose frequencies such as B, M and T across the operating band. This matters because the same BSS can behave differently at band edges, at temperature extremes, or with different power supply conditions.

The transmitter tests in Clause 6 check the main RF behaviors that affect cell performance and adjacent cells. They cover static Layer 1 functions, phase error and mean frequency error, mean transmitted RF carrier power, transmitted power versus time, adjacent channel power, conducted spurious emissions, and intermodulation attenuation. In practice, these tests show whether the BSS keeps bursts within the expected mask and stays within spectral limits that protect nearby channels.

The receiver tests in Clause 7 verify sensitivity, interference handling, blocking, intermodulation, AM suppression and spurious emissions. The clause also applies general statistical rules from Annex A for BER, RBER and FER measurements. That means receiver results are not just single readings - they are assessed with the document's sampling and statistical method.

Clause 8 covers radiated spurious emissions, which are emissions from the equipment as a whole rather than only at the antenna connector. This is important for site planning and regulatory checks because unwanted emissions can affect other services even when conducted measurements look acceptable.

Clause 9 checks radio link management functions such as synchronization, BCCH multiframe structure, TDMA frame structure, signal strength, signal quality, idle channel signal level and adaptive frame alignment. These tests matter because they affect how the BSS times, measures and manages radio links in normal network operation.

The standard also distinguishes essential conformance from complete conformance. Essential conformance is the subset intended to show compatibility and the important parts of transmission quality, while complete conformance covers the full test set for a performance parameter.

What terms does SIST EN 301 087 V7.2.1:2003 define?

  • BSS - In this standard, Base Station System means both a BTS and an integrated BSS, and it may include a separate BSC as test equipment.
  • BSSTE - Base Station System Test Equipment, the test setup used for several transmitter and receiver measurements.
  • micro-BTS - A BTS category defined by GSM05.05 and used here for specific power-class and performance requirements.
  • pico-BTS - A smaller BTS category also defined by GSM05.05 and covered by some separate limits in this document.
  • P-GSM - The primary GSM900 band.
  • E-GSM - The extended GSM900 band, including P-GSM.
  • R-GSM - The railway GSM900 band, including P-GSM and E-GSM.
  • SFH - Slow Frequency Hopping, where the BSS switches carrier frequency on a timeslot-by-timeslot basis.

Who uses SIST EN 301 087 V7.2.1:2003?

SIST EN 301 087 V7.2.1:2003 is used by BSS and BTS manufacturers, test laboratories, and mobile network operators. Manufacturers use it to declare operating bands, power levels and optional functions, then verify the RF performance of their equipment.

Test laboratories use it to run conformance tests in a repeatable way, including the measurement setups and uncertainty rules. Operators and acceptance teams use it to agree which tests to perform when checking equipment for network deployment.

Which standards are used with SIST EN 301 087 V7.2.1:2003?

The document references GSM and ETSI standards that define the GSM radio interface and supporting functions, including GSM01.04, GSM04.22, GSM05.01, GSM05.02, GSM05.03, GSM05.04, GSM05.05, GSM05.08 and GSM05.10. These provide the underlying definitions for abbreviations, coding, modulation, transmission, reception, link control and synchronization.

It also uses environmental and measurement standards: ETS 300 019-1, IEC 68-2 and IEC 721 for environmental conditions and tests, and ETR 027 and ETR 028 for RF measurement methods and uncertainty. ETS 300 113 is used for technical characteristics and test conditions for radio equipment with an antenna connector.

What does the SIST EN 301 087 V7.2.1:2003 document contain?

SIST EN 301 087 V7.2.1:2003 contains detailed test cases for transmitter, receiver and radio link management functions, with separate treatment of normal, extreme and vibration conditions where relevant. It also includes measurement setups for statistical testing and special test equipment in the annexes.

The document gives the structure of each test - purpose, test case, essential conformance, complete conformance and requirement reference - so the same clause can be used for type approval, verification or acceptance. It also identifies where results depend on the declared configuration, such as power steps, hopping, diversity, duplexers and ancillary RF amplifiers.

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SIST EN 301 087 V7.2.1:2003

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Frequently Asked Questions

SIST EN 301 087 V7.2.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2 and Phase 2+) (GSM); Base Station System (BSS) equipment specification; Radio aspects (GSM 11.21 version 7.2.1 Release 1998)". This standard covers: Upgrade to Release 1998 following CRs at SMG#28

Upgrade to Release 1998 following CRs at SMG#28

SIST EN 301 087 V7.2.1:2003 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 301 087 V7.2.1:2003 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 and Phase 2+) (GSM); Base Station System (BSS) equipment specification; Radio aspects (GSM 11.21 version 7.2.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 301 087 Version 7.2.1SIST EN 301 087 V7.2.1:2003en01-december-2003SIST EN 301 087 V7.2.1:2003SLOVENSKI
STANDARD
ETSIEN301087V7.2.1(2000-04)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2&Phase2+);BaseStationSystem(BSS)equipmentspecification;Radioaspects(GSM11.21version7.2.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)2(GSM11.21version7.2.1Release1998)ReferenceREN/SMG-021121Q7R1KeywordsDigitalcellulartelecommunicationssystem,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 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)3(GSM11.21version7.2.1Release1998)ContentsIntellectualPropertyRights.8Foreword.81Scope.92References.103Definitions,abbreviations,frequencybandsandchannels.113.1Definitions.113.2Abbreviations.123.3Frequencybandsandchannels.123.3.1Frequencybands.123.3.2Channelsandchannelnumbering.124Generaltestconditionsanddeclarations.134.1Outputpoweranddeterminationofpowerclass.134.2Specifiedfrequencyrange.134.3Frequencyhopping.144.4RFpowercontrol.144.5Downlinkdiscontinuoustransmission(DTX).144.6Testenvironments.144.6.1Normaltestenvironment.144.6.2Extremetestenvironment.154.6.2.1Extremetemperature.154.6.3Vibration.154.6.4Powersupply.154.7Acceptableuncertaintyofmeasurementequipment.164.8Interpretationofmeasurementresults.194.9Selectionofconfigurationsfortesting.204.10BTSConfigurations.204.10.1Receiverdiversity.204.10.2Duplexers.204.10.3Powersupplyoptions.214.10.4AncillaryRFamplifiers.214.10.5BSSusingantennaarrays.225Formatandinterpretationoftests.236Transmitter.246.1StaticLayer1functions.246.1.1Testpurpose.246.1.2Testcase.246.1.3Essentialconformance.256.1.4Completeconformance.256.1.5Requirementreference.256.2Phaseerrorandmeanfrequencyerror.256.2.1Testpurpose.256.2.2Testcase.256.2.3Essentialconformance.266.2.4Completeconformance.266.2.5Requirementreference.276.3MeantransmittedRFcarrierpower.276.3.1Testpurpose.276.3.2Testcase.276.3.3Essentialconformance.276.3.4Completeconformance.286.3.5Requirementreference.28SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)4(GSM11.21version7.2.1Release1998)6.4TransmittedRFcarrierpowerversustime.286.4.1Testpurpose.286.4.2Testcase.286.4.3Essentialconformance.296.4.4Completeconformance.296.4.5Requirementreference.306.5Adjacentchannelpower.306.5.1Spectrumduetomodulationandwidebandnoise.306.5.1.1Testpurpose.306.5.1.2Testcase.306.5.1.3EssentialConformance.316.5.1.4Completeconformance.336.5.1.5Requirementreference.336.5.2Switchingtransientsspectrum.336.5.2.1Testpurpose.336.5.2.2Testcase.336.5.2.3Essentialconformance.356.5.2.4Completeconformance.356.5.2.5Requirementreference.356.6Spuriousemissionsfromthetransmitterantennaconnector.356.6.1Conductedspuriousemissionsfromthetransmitterantennaconnector,insidetheBTStransmitband.366.6.1.1TestPurpose.366.6.1.2TestCase.366.6.1.3Essentialconformance.366.6.1.4Completeconformance.366.6.1.5RequirementReference.366.6.2Conductedspuriousemissionsfromthetransmitterantennaconnector,outsidetheBTStransmitband.366.6.2.1Applicability(Phase2).366.6.2.1.1TestPurpose.376.6.2.1.2TestCase.376.6.2.1.3Essentialconformance.386.6.2.1.4Completeconformance.386.6.2.1.5RequirementReference.386.6.2.2Applicability(Phase2+).386.6.2.2.1TestPurpose.386.6.2.2.2TestCase.396.6.2.2.3Essentialconformance.396.6.2.2.4Completeconformance.406.6.2.2.5RequirementReference.406.7Intermodulationattenuation.406.7.1Testpurpose.406.7.2Testcase.416.7.3EssentialConformance.426.7.4Completeconformance.426.7.5Requirementreference.436.8IntraBaseStationSystemintermodulationattenuation.436.8.1Testpurpose.436.8.2Testcase.436.8.3Essentialconformance.446.8.4Completeconformance.446.8.5Requirementreference.447Receivers.457.1StaticLayer1receiverfunctions(nominalerrorratios).457.1.1TestPurpose.457.1.2TestCase.457.1.3Essentialconformance.467.1.4Completeconformance.467.1.5RequirementReference.477.2ErroneousFrameIndicationPerformance.47SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)5(GSM11.21version7.2.1Release1998)7.2.1TestPurpose.477.2.2TestCase.477.2.3Essentialconformance.487.2.4Completeconformance.487.2.5Requirementreference.487.3StaticReferenceSensitivityLevel.487.3.1TestPurpose.487.3.2TestCase.487.3.3Essentialconformance.497.3.4Completeconformance.497.3.5RequirementsReference.517.4MultipathReferenceSensitivityLevel.517.4.1TestPurpose.517.4.2TestCase.517.4.3Essentialconformance.537.4.4Completeconformance.537.4.5RequirementReference.587.5Referenceinterferencelevel.587.5.1TestPurpose.587.5.2TestCase.587.5.3Essentialconformance.607.5.4Completeconformance.627.5.5RequirementsReference.677.6BlockingCharacteristics.677.6.1TestPurpose.677.6.2TestCase.677.6.3Essentialconformance.707.6.4Completeconformance.707.6.5Requirementsreference.707.7Intermodulationcharacteristics.707.7.1TestPurpose.707.7.2TestCase.707.7.3Essentialconformance.727.7.4Completeconformance.727.7.5RequirementReference.727.8AMsuppression.737.8.1TestPurpose.737.8.2TestCase.737.8.3Essentialconformance.747.8.4Completeconformance.747.8.5RequirementReference.747.9Spuriousemissionsfromthereceiverantennaconnector.747.9.1TestPurpose.747.9.2TestCase.747.9.3Essentialconformance.747.9.4Completeconformance.757.9.5RequirementReference.758Radiatedspuriousemissions.758.1TestPurpose.758.2TestCase.758.3Essentialconformance.768.4Completeconformance.778.5Requirementreference.779Radiolinkmanagement.779.1General.779.2Synchronization.779.2.1TimingTolerance.789.2.1.1Testpurpose.789.2.1.2Testcase.78SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)6(GSM11.21version7.2.1Release1998)9.2.1.3Essentialconformance.789.2.1.4Completeconformance.789.2.1.5Requirementreference.789.3Framestructure.799.3.1BCCHMultiframe.799.3.1.1Testpurpose.799.3.1.2Testcase.799.3.1.3Essentialconformance.799.3.1.4Completeconformance.799.3.1.5Requirementreference.799.3.2TDMA-framestructure.799.3.2.1Testpurpose.799.3.2.2Testcase.809.3.2.3Essentialconformance.809.3.2.4Completeconformance.809.3.2.5Requirementreference.809.4Radiolinkmeasurements.809.4.1SignalStrength.819.4.1.1MeasurementAccuracy.819.4.1.1.1Testpurpose.819.4.1.1.2Testcase.819.4.1.1.3Essentialconformance.819.4.1.1.4Completeconformance.819.4.1.2Selectivityofsignalstrengthmeasurements.829.4.1.2.1Testpurpose.829.4.1.2.2Testcase.829.4.1.2.3Essentialconformance.839.4.1.2.4Completeconformance.839.4.1.2.5Requirementreference.839.4.2Signalquality.849.4.2.1Testpurpose.849.4.2.2Testcase.849.4.2.3Essentialconformance.849.4.2.4Completeconformance.849.4.2.5Requirementreference.859.4.3Idlechannelsignallevel.859.4.3.1Testpurpose.859.4.3.2Testcase.869.4.3.3Essentialconformance.869.4.3.4Completeconformance.869.4.3.5Requirementreference.869.5Adaptiveframealignment.869.5.1Testpurpose.869.5.2Testcase.879.5.3Essentialconformance.879.5.4Completeconformance.889.5.5Requirementreference.88AnnexA(informative):Testingofstatisticalparameters.89A.1Generaltheoreticalmethodology.89A.2Detailedtheoreticalmethodology.90A.3Limitationsandcorrectionstothetheoreticalmethodology.91A.3.1Independenterrors.92A.3.2Gaussiandistribution.92A.3.3Stationaryrandomprocesses.92A.3.4Lowerrorratios.93A.3.5Totalcorrections.93SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)7(GSM11.21version7.2.1Release1998)A.4Alternativeexperimentalmethodology.93A.5Detaileddefinitionoferrorevents.94AnnexB(informative):Descriptionofspecialtestequipment.95B.1BaseStationSystemTestEquipment(BSSTE).95B.1.1Fadingandmultipathpropagationsimulator.95B.2MeasurementsetupsforTXintermodulation.95B.2.1Testset-upforIntermodulationAttenuation(6.7.).96B.2.1.1RX-Band.96B.2.1.2OutsideRXBand.96B.2.2Testset-upforIntraBSSIntermodulationAttenuation(6.8.).97B.2.2.1RX-Band.97B.2.2.2TX-Band.97AnnexC(informative):Numberofsamplesneededforstatisticaltesting.98C.1GSM900;Numberofsamplesfortesting.98C.2DCS1800;NumberofSamplesforTesting.118AnnexD(informative):Changehistory.141History.143SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)8(GSM11.21version7.2.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbytheSpecialMobileGroup(SMG).ThepresentdocumentspecifiestheRadioFrequency(RF)testmethodsandconformancerequirementsforGSM900andDCS1800BaseStationSystems(BSS)s.withintheDigitalcellulartelecommunicationssystem(Phase2+).ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocument,itwillberesubmittedforformalapprovalprocedurebyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NOTE:Thepresentdocumentcontainsbothessentialconformancerequirementsandcompleteconformancerequirements.Essentialconformancerequirementsarethoserequirementswhichmaybedeemedsufficientforradiotypeapprovalpurposes,completeconformancerequirementscoverallconformanceaspects.NationaltranspositiondatesDateofadoptionofthisEN:31March2000DateoflatestannouncementofthisEN(doa):30June2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31December2000DateofwithdrawalofanyconflictingNationalStandard(dow):31December2000SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)9(GSM11.21version7.2.1Release1998)1ScopeThepresentdocumentspecifiestheRadioFrequency(RF)testmethodsandconformancerequirementsforGSM900andDCS1800BaseStationSystems(BSS)s.Thesehavebeenderivedfrom,andareconsistentwith,thecoreGSMspecificationsspecifiedintherequirementsreferencesubclauseofeachtest.ThepresentdocumentisapplicabletoBSSmeetingtherequirementsofeitherGSMPhase2orGSMPhase2+.Unlessotherwisestated,alltestsareapplicabletoBSSmeetingPhase2and/orPhase2+GSMrequirements,becausetherequirementsofthePhase2andPhase2+coreGSMspecificationswhicharereferencedinthetestareconsistent.MostdifferencesbetweenPhase2andPhase2+requirementsrepresentPhase2+featureswhichareoptionalfortheBSStosupport.Foreachtest,twoconformancerequirementsarespecified:-essentialconformancerequirements;-completeconformancerequirements.Essentialconformancerequirementsarethosewhicharerequired:a)toensurecompatibilitybetweentheradiochannelsinthesamecell;b)toensurecompatibilitybetweencells,bothco-ordinatedandunco-ordinated;c)toensurecompatibilitywithexistingsystemsinthesameoradjacentfrequencybands;d)toverifytheimportantaspectsofthetransmissionqualityofthesystem.Essentialconformancerequirementsaresufficienttoverifytheperformanceoftheequipmentforradiotypeapprovalpurposes,incountrieswherethisisapplicable.CompleteconformancerequirementsmaybetestedtoverifyallaspectsoftheperformanceofaBSS.Theserequirementsareintendedtobeusedbymanufacturersandoperatorstoallowconformanceandacceptancetestingtobeperformedinaconsistentmanner;theteststobeperformedshouldbeagreedbetweentheparties.Insometeststhereareseparaterequirementsformicro-BTSandBTS.Ifthereisnoseparaterequirementforamicro-BTS,therequirementsfortheBTSapplytoamicro-BTS.Inthepresentdocument,thereferencepointforRFconnections(exceptforthemeasurementofmeantransmittedRFcarrierpower)istheantennaconnector,asdefinedbythemanufacturer.ThepresentdocumentdoesnotapplytorepeatersorRFdeviceswhichmaybeconnectedtoanantennaconnectorofaBSS,exceptasspecifiedinsubclause4.10.SIST EN 301 087 V7.2.1:2003

ETSIETSIEN301087V7.2.1(2000-04)10(GSM11.21version7.2.1Release1998)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(ETR350):"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM04.22(ETS300946):"Digitalcellulartelecommunicationssystem(Phase2+);RadioLinkProtocol(RLP)fordataandtelematicservicesontheMobileStation-BaseStationSystem(MS-BSS)interfaceandtheBaseStationSystem-Mobile-servicesSwitchingCentre(BSS-MSC)interface".[3]GSM05.01:"Digitalcellulartelecommunicationssystem(Phase2);Physicallayerontheradiopath;
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