ETSI ETS 300 607-3 ed.9 (1998-12)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2) (GSM); Mobile Station (MS) conformance specification; Part 3: Layer 3 (L3) Abstract Test Suite (ATS) (GSM 11.10-3 version 4.23.1)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:ETS 300 607-3 Edition 9SIST ETS 300 607-3 E9:2003en01-december-2003SIST ETS 300 607-3 E9:2003SLOVENSKI
STANDARD



SIST ETS 300 607-3 E9:2003



EUROPEANETS 300 607-3TELECOMMUNICATIONDecember 1998STANDARDNinth EditionSource: SMGReference: RE/SMG-071110PR7-3ICS:33.020Key words:Digital cellular telecommunications system, Global System for Mobile Communication (GSM)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRDigital cellular telecommunications system (Phase 2);Mobile Station (MS) conformance specification;Part 3: Layer 3 (L3) Abstract Test Suite (ATS)(GSM 11.10-3 version 4.23.1)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEInternet: secretariat@etsi.fr - http://www.etsi.fr - http://www.etsi.orgTel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998. All rights reserved.SIST ETS 300 607-3 E9:2003



Page 2ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Standards Making Support Dept." at the address shown on the title page.SIST ETS 300 607-3 E9:2003



Page 3ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.103.1Definitions.103.2Abbreviations.104Test Suite Structure (TSS).114.1Test suite naming convention.114.2Suite Overview.124.3Test groups.124.3.1Valid Behaviour tests (BV).124.3.2Invalid Behaviour/Inopportune Behaviour tests (BI-BO).124.4Test Step Structure.134.4.1Preambles.134.4.2Postambles.135Test Purposes (TP).135.1TP and test case naming convention.136Abstract test method and test configurations.136.1Test system model.136.2Test Method.14Annex A (normative):Layer 3 Abstract Test Suite.15A.1The TTCN Graphical form (TTCN.GR).15A.2The TTCN Machine Processable form (TTCN.MP).15Annex B (normative):Partial IXIT proforma.16Introduction.16B.1Identification Summary.17B.2Abstract Test Suite Summary.17B.3Test Laboratory.17B.3.1Test Laboratory Identification.17B.3.2Accreditation status of the test service.18B.3.3Manager of Test Laboratory.18B.3.4Contact person of Test Laboratory.18B.3.5Means of Testing.18B.3.6Instructions for Completion.19B.4Client.20B.4.1Client Identification.20B.4.2Client Test Manager.21B.4.3Client Contact person.21B.4.4Test Facilities Required.21B.5System Under Test.22SIST ETS 300 607-3 E9:2003



Page 4ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998B.5.1SUT Information.22B.5.2Limitations of the SUT.23B.5.3Environmental Conditions.24B.6Ancillary Protocols.26B.6.1Ancillary Protocols 1.26B.6.2Ancillary Protocols 2.26B.7Protocol Layer Information for L3 of Mobile Station.26B.7.1Information provided for test purposes by the MS supplier.26B.7.2MMI information.39B.7.3Test house specified parameters.44Annex C (normative):PCTR Proforma.76Annex D (normative):Enhanced Full Rate Abstract Test Suite.77D.1The TTCN Graphical form (TTCN.GR).77D.2The TTCN Machine Processable form (TTCN.MP).77Annex E (informative):Cell Selection Abstract Test Suite.78E.1The TTCN Graphical form (TTCN.GR).78E.2The TTCN Machine Processable form (TTCN.MP).78Annex F (informative):Dual band Abstract Test Suite.79F.1The TTCN Graphical form (TTCN.GR).79F.2The TTCN Machine Processable form (TTCN.MP).79History.80SIST ETS 300 607-3 E9:2003



Page 5ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998ForewordThis European Telecommunication Standard (ETS) has been produced by the Special Mobile Group(SMG) of the European Telecommunications Standards Institute (ETSI).This ETS describes the technical characteristics and methods of test for Mobile Stations (MSs), operatingin the 900 MHz and 1 800 MHz frequency band (GSM 900 and DCS 1 800) within the digital cellulartelecommunications system.This ETS corresponds to GSM technical specification GSM 11.10-3 version 4.23.0.This part of the ETS (Part 3), contains Tree and Tabular Combined Notation (TTCN) for Layer 3,signalling for MS supporting Enhanced Full Rate Speech, and cell selection conformity specifications forwhich Mobile Stations, within the digital cellular telecommunications system (Phase 2), are tested forcompliance.The graphical form ATSThe electronic forms of the graphical representation (TTCN.GR format) corresponding to the ATS forLayer 3 are contained in the file L3-4n0.ps (Layer 3), EF-4n0.ps (Enhanced Full Rate), CS-4n0.ps (CellSelection) and DB-4n0.ps (Dual Band)1) on the diskettes included as a part of this ETS (Part 3).The machine processable ATSThe electronic forms of the machine processable files (TTCN.MP format) corresponding to the ATS forLayer 3 are contained in the file L3-4n0.mp (Layer 3), EF-4n0.mp (Enhanced Full Rate), CS-4n0.mp (CellSelection) and DB-4n0.mp (Dual Band)1) on the diskettes included as a part of this ETS (Part 3).ETS 300 607 consists of three parts, which have the following ETS numbers and titles:ETS 300 607-1Digital cellular telecommunications system (Phase 2);Mobile Station (MS) conformance specification;Part 1: Conformance specificationReference: GSM 11.10-1.ETS 300 607-2Digital cellular telecommunications system (Phase 2);Mobile Station (MS) conformance specification;Part 2: Protocol Implementation Conformance Statement (ICS)proforma specificationReference: GSM 11.10-2.ETS 300 607-3Digital cellular telecommunications system (Phase 1);Mobile Station (MS) conformance specification;Part 3: Layer 3 (L3) Abstract Test Suite (ATS)Reference: GSM 11.10-3.Transposition datesDate of adoption of this ETS:18 December 1998Date of latest announcement of this ETS (doa):31 March 1999Date of latest publication of new National Standardor endorsement of this ETS (dop/e):30 September 1999Date of withdrawal of any conflicting National Standard (dow):30 September 1999
1)These files are located in an archive file named 6073_E9.ZIP. Other file formats are available on request.SIST ETS 300 607-3 E9:2003



Page 6ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998Blank pageSIST ETS 300 607-3 E9:2003



Page 7ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 19981ScopeThis European Telecommunication Standard (ETS) specifies the Abstract Test Suite (ATS) and partialIXIT proforma for the Network Layer (Layer 3) at the mobile radio interface of the GSM or DCS (Phase 2)mobile stations (MS) conforming to the ETSs for the Radio Resource management, the MobilityManagement, the circuit-switched Call Control, the Supplementary Services and Short Message Servicesfor the digital cellular telecommunications systems (Phase 2).The ISO standards for the methodology of conformance testing are used as the basis for the testspecifications.2Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.[1]ISO/IEC 9646-1: "Information Technology-OSI- Conformance TestingMethodology and Framework, Part 1: General Concepts".[2]ISO/IEC 9646-2: "Information Technology-OSI- Conformance TestingMethodology and Framework, Part 2: Abstract Test Suite Specification".[3]ISO/IEC 9646-3: "Information Technology-OSI- Conformance TestingMethodology and Framework, Part 3: The Tree and Tabular CombinedNotation".[4]ISO/IEC 9646-5: "Information Technology-OSI- Conformance TestingMethodology and Framework, Part 5: Requirements on test laboratories andclients for the conformance assessment process".[5]ISO/IEC 8824: "Information Technology-OSI- Specification of Abstract SyntaxNotation One (ASN.1)".[6]ISO/IEC 8825: "Information Technology-OSI- Specification of Basic EncodingRules for Abstract Syntax Notation One (ASN.1)".[7]ITU-T Recommendation Q.773: "Specifications of Signalling System No.7;Transaction capabilities formats and encoding".[8]ETS 300 287: "Integrated Services Digital Network (ISDN); Signalling SystemNo.7, Transaction Capabilities Application Part (TCAP) version 2".[9]ETS 300 406 (January 1995): "Methods for Testing and Specification (MTS);Protocol and profile conformance testing specifications; Standardizationmethodology".[10]GSM 02.02 Version 4.2.2: "Digital cellular telecommunication system (Phase 2);Bearer Services (BS) supported by a GSM Public Land Mobile Network(PLMN)".[11]GSM 02.03 Version 4.3.1: "Digital cellular telecommunication system (Phase 2);Teleservices supported by a GSM Public Land Mobile Network (PLMN)".[12]GSM 02.06 Version 4.5.2: "Digital cellular telecommunication system (Phase 2);Types of Mobile Stations (MS)".[13]GSM 02.07 Version 4.8.2: "Digital cellular telecommunication system (Phase 2);Mobile Station (MS) features".SIST ETS 300 607-3 E9:2003



Page 8ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998[14]GSM 02.30 Version 4.13.0: "Digital cellular telecommunication system(Phase 2); Man-Machine Interface (MMI) of the Mobile Station (MS)".[15]GSM 03.03 Version 4.9.0: "Digital cellular telecommunication system (Phase 2);Numbering, addressing and identification".[16]GSM 03.09 Version 4.6.0: "Digital cellular telecommunications system(Phase 2); Handover procedures".[17]GSM 03.10 Version 4.3.1: "Digital cellular telecommunications system(Phase 2); GSM Public Land Mobile Network (PLMN) connection types".[18]GSM 03.11 Version 4.10.1: "Digital cellular telecommunication system(Phase 2); Technical realization of supplementary services".[19]GSM 03.12 Version 4.4.2: "Digital cellular telecommunications system(Phase 2); Location registration procedures".[20]GSM 03.14 Version 4.1.1: "Digital cellular telecommunications system(Phase 2); Support of Dual Tone Multi-Frequency signalling (DTMF) via theGSM system".[21]GSM 03.22 Version 4.11.0: "Digital cellular telecommunication system(Phase 2); Functions related to Mobile Station (MS) in idle mode".[22]GSM 03.40 Version 4.13.0: "Digital cellular telecommunication system(Phase 2); Technical realization of the Short Message Service (SMS) Point toPoint (PP)".[23]GSM 03.41 Version 4.11.0: "Digital cellular telecommunication system(Phase 2); Technical realization of Short Message Service Cell Broadcast(SMSCB)".[24]GSM 04.01 Version 4.0.4: "Digital cellular telecommunications system(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Generalaspects and principles".[25]GSM 04.03 Version 4.1.1: "Digital cellular telecommunications system(Phase 2); Mobile Station - Base Station System (MS - BSS) interface Channelstructures and access capabilities".[26]GSM 04.04 Version 4.0.4: "Digital cellular telecommunication system (Phase 2);layer 1
General requirements".[27]GSM 04.05 Version 4.0.3: "Digital cellular telecommunication system (Phase 2);Data Link (DL) layer
General aspects".[28]GSM 04.06 Version 4.4.0: "Digital cellular telecommunication system (Phase 2);Mobile Station - Base Station System (MS - BSS) interface
Data Link (DL) layerspecification".[29]GSM 04.07 Version 4.3.1: "Digital cellular telecommunication system (Phase 2);Mobile radio interface signalling layer 3
General aspects".[30]GSM 04.08 Version 4.22.0: "Digital cellular telecommunication system(Phase 2); Mobile radio interface layer 3 specification".[31]GSM 04.10 Version 4.10.1: "Digital cellular telecommunication system(Phase 2); Mobile radio interface layer 3
Supplementary services specificationGeneral aspects".SIST ETS 300 607-3 E9:2003



Page 9ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998[32]GSM 04.11 Version 4.10.0: "Digital cellular telecommunication system(Phase 2); Point-to-Point (PP) Short Message Service (SMS) support on mobileradio interface".[33]GSM 04.12 Version 4.6.0: "Digital cellular telecommunication system (Phase 2);Short Message Service Cell Broadcast (SMSCB) support on the mobile radiointerface".[34]GSM 04.80 Version 4.11.1: "Digital cellular telecommunication system(Phase 2); Mobile radio interface layer 3 supplementary services specification;Formats and coding".[35]GSM 04.81 Version 4.4.1: "Digital cellular telecommunication system (Phase 2);Line identification supplementary services - Stage 3".[36]GSM 04.82 Version 4.9.1: "Digital cellular telecommunication system (Phase 2);Call Forwarding (CF) supplementary services - Stage 3".[37]GSM 04.83 Version 4.6.1: "Digital cellular telecommunication system (Phase 2);Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 3".[38]GSM 04.84 Version 4.3.2: "Digital cellular telecommunication system (Phase 2);MultiParty (MPTY) supplementary services - Stage 3".[39]GSM 04.85 Version 4.1.1: "Digital cellular telecommunications system(Phase 2); Closed User Group (CUG) supplementary services - Stage 3".[40]GSM 04.86 Version 4.5.2: "Digital cellular telecommunication system (Phase 2);Advice of Charge (AoC) supplementary services - Stage 3".[41]GSM 04.88 Version 4.7.1: "Digital cellular telecommunication system (Phase 2);Call Barring (CB) supplementary services - Stage 3".[42]GSM 04.90 Version 4.1.1: "Digital cellular telecommunication system (Phase 2);Unstructured supplementary services operation - Stage 3".[43]GSM 05.01 Version 4.6.0: "Digital cellular telecommunications system(Phase 2); Physical layer on the radio path General description".[44]GSM 05.02 Version 4.9.1: "Digital cellular telecommunication system (Phase 2);Multiplexing and multiple access on the radio path".[45]GSM 05.03 Version 4.5.1: "Digital cellular telecommunication system (Phase 2);Channel coding".[46]GSM 05.04 Version 4.0.3: "Digital cellular telecommunication system (Phase 2);Modulation".[47]GSM 05.05 Version 4.22.1: "Digital cellular telecommunication system (Phase2); Radio transmission and reception".[48]GSM 05.08 Version 4.21.1: "Digital cellular telecommunication system(Phase 2); Radio subsystem link control".[49]GSM 05.10 Version 4.9.0: "Digital cellular telecommunication system (Phase 2);Radio subsystem synchronisation".[50]GSM 07.01 Version 4.10.0: "Digital cellular telecommunication system(Phase 2); General on Terminal Adaptation Functions (TAF) for Mobile Stations(MS)".SIST ETS 300 607-3 E9:2003



Page 10ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998[51]GSM 08.08 Version 4.12.0: "Digital cellular telecommunications system(Phase 2); Mobile-services Switching Centre - Base Station System (MSC -BSS) interface Layer 3 specification".[52]GSM 08.58 Version 4.9.0: "Digital cellular telecommunications system(Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS)interface Layer 3 specification".[53]GSM 09.02 Version 4.18.0: "Digital cellular telecommunication system(Phase 2); Mobile Application Part (MAP) specification".[54]GSM 11.10-1 Version 4.23.0: "Digital cellular telecommunications system(Phase 2); Mobile Station (MS) conformance specification; Part 1: Conformancespecification".[55]GSM 11.10-2 Version 4.15.0: "Digital cellular telecommunications system(Phase 2); Mobile Station (MS) conformance specification; Part 2: ProtocolImplementation Conformance Statement (PICS) Proforma specification".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS, the following definitions apply:Abstract Test Suite (ATS): Refer to ISO/IEC 9646-1 [1].Implementation Under Test (IUT): Refer to ISO/IEC 9646-1 [1].Partial Protocol Implementation eXtra Information for Testing (IXIT): Refer to ISO/IEC 9646-1 [1].Point of Controls and Observations (PCO): Refer to ISO/IEC 9646-1 [1].Protocol Implementation Conformance Statement (ICS):
Refer to ISO/IEC 9646-1 [1].System Under Test (SUT): Refer to ISO/IEC 9646-1 [1].3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:ATSAbstract Test SuiteBIInvalid Behaviour testsBOInopportune Behaviour testsBVValid Behaviour testsCACApability testsEDP-NEvent Detection Point - NotificationEDP-REvent Detection Point - RequestETSEuropean Telecommunication StandardFEFunctional EntityFSMFinite State MachineICSImplementation Conformance StatementIUTImplementation Under TestIXITImplementation eXtra Information for TestingPDUProtocol Data UnitSUTSystem Under TestTPTest PurposeTSSTest Suite StructureFurther abbreviations used within GSM related ETS may be found in ETR 100.Abbreviations for test case group names may be found in figure 1 and 2.SIST ETS 300 607-3 E9:2003



Page 11ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 19984Test Suite Structure (TSS)4.1Test suite naming conventionThe test group identifier for each group and subgroup is built according to the scheme in figure 1.Identifier:L3 = category:BITBIT, Basic Interconnection tests(not used)CACA, Capability tests(not used)BVBV, Valid Behaviour testsBI-BOBI and BO, Invalid and Inopportune Behaviour tests = group:INInitial testsIDIdle mode testsRRRadio Resource managementMMMobility ManagementCCCall ControlSPStructured ProceduresSSSupplementary servicesLLFLower Layer FailuresUUEUnknown, Unforeseen or erroneous Elements = group:CRChannel RequestATIMSI detach and IMSI attachSMTSequenced MM / CC message transferECEstablishment CauseIAImmediate assignmentPGTest of pagingMRTest of measurement reportASSTest of the channelHOTest of handoverFRTest of frequency redefinitionCMMTest of the channel mode modify procedureCYTest of ciphering mode settingCMTest of classmarkCHRTest of channel releaseSTARTTest of starting timeIDAUIdentification and authenticationLULocation updatingCONMM connectionCCSMOState Machine Verification, Mobile Originating CallCCSMTState Machine Verification, Mobile Terminating CallSMICFState machine verification, In Call FunctionsCRECall Re-establishmentUUSUser to user signallingUPDUnknown protocol discriminatorTISTI and skip indicatorUMTUndefined or unexpected message typeUIEUnforeseen information elements in the non-imperativeNMIENon-semantical mandatory IE errorsCNRUnknown IE, comprehension not requiredSBSpare bitsSIST ETS 300 607-3 E9:2003



Page 12ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998 = group:ACHandover / successful / active callCUEHandover / successful / call under establishmentFSYHandover / successful / active call / finely synchronizedPRSPre-synchronized handoversPRFProtocol failuresACCLocation updating / acceptedREJLocation updating / rejectedABNLocation updating / abnormal casesRELLocation updating / releasePERLocation updating / periodicHPERLocation updating / periodic HPLMN searchIWATLocation updating / interworking of attach and periodicESTMM connection / establishmentEXPMM connection / expiryNWABMM connection / abortion by the networkFRQPMM connection / follow-on request pendingU0Mobile Originating Call U0 StateU0.1Mobile Originating Call U0.1 MM Connection pendingU1Mobile Originating Call U1 StateU3Mobile Originating Call U3 StateU4Mobile Originating Call U4 StateU10Mobile Originating Call U10 StateU11Mobile Originating Call U11 StateU12Mobile Originating Call U12 StateU19Mobile Originating Call U19 StateU0Mobile Terminating Call U0 StateU6Mobile Terminating Call U6 StateU9Mobile Terminating Call U9 StateU7Mobile Terminating Call U7 StateU8Mobile Terminating Call U8 StateDTMFState machine verification, In Call Functions / transferCHCState machine verification, In Call Functions /TICMState machine verification, In Call Functions / in-OICMState machine verification, In Call Functions / in-Figure 1: Test group identifier naming convention scheme4.2Suite OverviewFigure 2 shows the structure of the test suites for L3.L3 ATSBVBI/OINIDRRMMCCSPSSSMSLLFUUEFigure 2: Test suite structure of the L3 tests4.3Test groups4.3.1Valid Behaviour tests (BV)Predefined state transitions are considered as valid. The test purposes in the valid behaviour testsubgroup cover the verification of the normal and exceptional procedures of the various Finite StateMachines (FSMs), i.e. a valid behaviour test is a test where the message sequence and the messagecontents are considered as valid.4.3.2Invalid Behaviour/Inopportune Behaviour tests (BI-BO)This test sub group verifies that the Implementation Under Test (IUT) is able to react properly havingreceived an invalid Protocol Data Unit (PDU) or in the case an inopportune protocol event occurs. Aninvalid PDU is defined as a syntactically incorrect message. An inopportune event is syntactically correctbut occurs when it is not expected, e.g. a correctly coded operation is received in a wrong state (the IUTmay respond Error UnexpectedComponentSequence).SIST ETS 300 607-3 E9:2003



Page 13ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 19984.4Test Step Structure4.4.1PreamblesThe preamble is defined for each test purpose.4.4.2PostamblesAfter each test case the IUT shall be brought to the state as defined in the postamble for each testpurpose.5Test Purposes (TP)For each conformance requirement a Test Purpose (TP) is defined. The test purposes are specified in theATS Dynamic part (annex A).5.1TP and test case naming conventionIn order clearly to map the conformance requirements specified in the prETS 300 607-1 and TTCN testcases in the ATS, the section numbers in the prETS 300 607-1 are used as test case names.The identifier of each TP is identical to the name of the implemented TTCN test case."Test Purpose Identifier" = "Test Case Name" = TPI = TC_NN_A_B_C_D_E, where NN, A, B, C, D and Eare digits used in the corresponding section numbers of prETS 300 607-1. For example, the test casename TC_26_5_6_2 is the TTCN specification corresponding to the conformance requirements in thesection 26.5.6.1.2 in the prETS 300 607-1. In case where the section has been implemented in more thanone test case sub numbering has been introduced. For example, the section 26.7.4.2.4 ofprETS 300 607-1, Location updating/rejected/national roaming testing is split into 5 test cases. Thecorresponding TCs are identified as TC_26_7_4_2_4_1, TC_26_7_4_2_4_2, TC_26_7_4_2_4_3,TC_26_7_4_2_4_4 and TC_26_7_4_2_4_5, respectively.6Abstract test method and test configurationsThe distributed test method applies to the L3 MS testing. The test method uses a lower tester and aMan-Machine Interface (MMI) as an upper tester at the SUT.6.1Test system modelThe model of the L3 test system is based on the original protocol architecture at the air interface. The testsystem consists conceptually of a lower tester LT, the L3 test programme (executable test suite), a L2radio link emulator, a management functional unit, the L1 service provider and a TRx set (see figure 1).LTL2emulatorMngtTRxsetPCOL1RadioconnectionSUTIUTL3L1TRxL2L3testprogrammeTestsystemMSTestoperatorFigure 3: Test system and distributed test methodSIST ETS 300 607-3 E9:2003



Page 14ETS 300 607-3 (GSM 11.10-3 version 4.23.1): December 1998The LT provides the test environment and for test execution and the means of control and observation atthe L3 lower service boundary within the test system.The L3 TTCN test specification uses the three LT interfaces to communicate with the MS, the systemunder test, and with the ot
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