SIST EN 302 405 V7.1.1:2003

• Abstract:

  To be provided Cordless Telephoney System Stage 2 description

• 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 302 405 V7.1.1 (2000-08) - Digital cellular telecommunications system (Phase 2+) (GSM); GSM Cordless Telephony System (CTS), Phase 1; CTS Architecture Description; Stage 2 (GSM 03.56 version 7.1.1 Release 1998)

Overview

SIST EN 302 405 V7.1.1:2003 outlines the architectural framework and operational concepts for the GSM Cordless Telephony System (CTS), Phase 1. Developed by the Slovenski inštitut za standardizacijo (SIST), this standard is harmonized with the European EN 302 405 standard, defining the stage 2 system architecture for digital cordless telephony services based on the GSM (Global System for Mobile communication) platform. The scope addresses the integration of cordless telephony capabilities within GSM networks, providing a detailed description of CTS structure, network elements, roles, procedures, and interfaces as required for effective deployment and interoperability.

Key Topics

• CTS Service Architecture: Structure and function of a cordless telephony system leveraging GSM technology, including both fixed network and GSM network connections.
• Network Components: Description of the main CTS elements, including CTS-Fixed Part (CTS-FP), CTS-Mobile Station (CTS-MS), CTS Home Location Register (CTS-HLR), and other relevant entities.
• Operational Scenarios: Various deployment scenarios, from licensed GSM-based operation to license exempt bands, emphasizing flexibility and adaptability to national frequency allocation policies.
• Role Models: Subscription, agreement, and interaction models for CTS-FP owners and CTS-MS subscribers, highlighting relationships with GSM and CTS operators.
• Radio Interface and Frequency Management: Modified GSM radio interface for cordless operation, implementation of Adaptive Frequency Allocation (AFA), and Total Frequency Hopping (TFH) for minimal interference.
• Security and Enrolment: Procedures for subscriber authentication, enrolment, and information management across the CTS ecosystem.
• Operator Control: Methods for GSM operators to manage access and allocate frequency resources for CTS operation, including Generic Frequency Lists (GFL).

Applications

The architecture and requirements specified in SIST EN 302 405 V7.1.1:2003 support a range of practical cordless telephony applications:

• Residential Cordless Telephony: Enables GSM-based cordless service in single-cell environments, allowing subscribers to use mobile technology for home telephony through a private base station (CTS-FP).
• Business and Enterprise: Provides businesses with flexible in-building wireless telephony capable of seamless integration with GSM or fixed networks.
• Fixed-Mobile Convergence (FMC): Lays the foundation for unified user experiences, where subscribers can access voice and messaging services via GSM technology, regardless of being on a public cellular or private cordless network.
• Network Operator Services: Facilitates GSM operators in offering value-added cordless telephony solutions, expanding service portfolios and revenue opportunities.
• National Frequency Management: Supports regulatory and operator-controlled frequency allocation for CTS operation, addressing both licensed and license exempt spectrum usage.

Related Standards

For comprehensive implementation and compliance, the following related standards provide essential references:

• GSM 02.56: Stage 1 service description for GSM Cordless Telephony System.
• GSM 03.03: Numbering, addressing, and identification in GSM networks.
• GSM 03.20: Security-related network functions for CTS, Stage 2.
• GSM 03.52: Lower layers of the CTS radio interface.
• GSM 01.04: Abbreviations and acronyms relevant to GSM technology.
• GSM 03.40: Technical realization of the Short Message Service (SMS) point-to-point.
• EN 302 405: European equivalent standard for GSM CTS architecture and network description.

Practical Value

SIST EN 302 405 V7.1.1:2003 provides a detailed technical blueprint for implementing GSM-based cordless telephony, facilitating interoperability, security, and flexibility in both residential and enterprise telecom environments. Its guidelines help system designers, operators, and regulatory bodies ensure smooth integration of cordless features with existing GSM infrastructure, optimizing service delivery and expanding connectivity options for end-users. This standard is vital for any stakeholder involved in the planning, deployment, or regulation of advanced digital cordless telecommunication systems.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); GSM Cordless Telephony System (CTS), Phase 1; CTS Architecture Description; Stage 2 (GSM 03.56 version 7.1.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 302 405 Version 7.1.1SIST EN 302 405 V7.1.1:2003en01-december-2003SIST EN 302 405 V7.1.1:2003SLOVENSKI
STANDARD
ETSIEN302405V7.1.1(2000-08)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;CTSArchitectureDescription;Stage2(GSM03.56version7.1.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)2(GSM03.56version7.1.1Release1998)ReferenceDEN/SMG-030356Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM),GSMCordlessTelephonySystem(CTS)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 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)3(GSM03.56version7.1.1Release1998)ContentsIntellectualPropertyRights.6Foreword.6Introduction.61Scope.72References.73Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.84Mainconcepts.84.1CTSdefinition.84.2CTSNetwork.84.3CTSRolemodels.94.3.1CTSFPowner'srolemodel.94.3.2CTSMSsubscriber'srolemodel.94.4CTSRadiointerface.104.4.1AdaptiveFrequencyAllocation.104.4.2TotalFrequencyHopping.104.4.3CTSandGSMcompatibilityissues.104.5CTSoperationalrequirements.104.5.1GSMcoveragefromDPLMN.114.5.2LimitedGSMcoveragefromDPLMN.114.5.3NoGSMcoveragefromDPLMN.124.6CTSReferenceModel.124.6.1GeneralCTSReferenceModel.124.6.2SimplifiedCTSreferencemodel(limitedenrolmentcontrol).134.6.3SimplifiedCTSreferencemodel(LicenceexemptCTSband).144.6.4CTSconnectedtoPLMNreferencemodel.154.7GSMOperatorcontrolofCTSservice.164.7.1CTSSystemcontrol.174.7.2GSMOperatorcontrolofCTSfrequencylist.174.7.3CTSsysteminitialisationforlicenseexemptfrequencybandforCTSoperation.184.7.4CTSsysteminitialisationwithDPLMNcoverageandlimitedcoverage.184.7.4.1FirststageCTS-FPinitialisation(TemporaryGFLallocation).184.7.4.2SecondstageCTS-FPinitialisation(GFLconfirmation).184.7.5CTSsysteminitialisationwithoutDPLMNcoverage.184.7.6GFLupdate.194.7.6.1CTSFPGFLupdate.194.7.7ErasureofGFLintheCTSFP.194.8De-initialisationofCTSFP.194.8.1CTSOperatorcontrolmode.194.8.2Licenceexemptmode.204.9CTSMSEnrolment.204.9.1EnrolmentcontrolattheCTS-FP.204.9.2EnrolmentcontrolattheCTS-SN.214.9.2.1InitialenrolmentattheCTS-SN.214.9.2.2SubsequentenrolmentattheCTS-SN.214.9.3AgreementbetweentheCTSFPSubscriberandCTSMSsubscribers.214.9.4CTSauthorisationcheckofenrolmentofaCTSMSontoaCTSFP.214.10De-enrolmentofCTSMSfromaCTS-FP.214.10.1Mutualautentication.224.11CTSMMandCMlayers.224.12CTSMMandCMlayersonthefixednetworkside.224.13CTSMobilityservices.22SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)4(GSM03.56version7.1.1Release1998)4.13.1CTSsupportinidlemode.224.13.2CTSattachanddetach.224.14CTSCMlayer.224.14.1CTSserviceindication.224.15SubscriberinformationforCTS.235Transmission.236Informationstorage.236.1InformationmanagedperCTS-MSsubscriber.236.1.1StoredintheCTS-MSSIM.236.1.2StoredintheHLR.236.1.3StoredintheMSC/VLR.236.2InformationmanagedperCTS-FPsubscriber.236.2.1StoredintheCTS-FPSIM.236.2.2StoredintheCTS-FPE.236.2.3StoredintheCTS-SN.236.2.4StoredintheCTS-HLR.247Identities.247.1IdentificationoftheCTS-FP.247.1.1IFPSI.247.1.2IFPEI.247.1.3FPBI.247.2Addressingparameters.247.2.1AddressingtheCTS-FP.247.2.1.1CTS-FPFixedNetworkdiallingnumber.247.2.1.2CTSFPname.247.2.2AddressingtheCTS-MSsubscriber.247.2.2.1MSISDN.247.2.2.2CTS-MSSubscriberIdentity(CTS-MSI).258Operationandmaintenanceaspects.259Functionandinformationflows.259.1CTSFPmanagement.259.1.1CTSFPInitialisation.259.1.2UpdateofCTSFPfrequencies.269.2CTSmanagementforCTSMS.279.3CTSintegrationtoFixedMobileConvergenceapplications.279.4FunctionsrelatedtoMSinidlemodeforsupportofCTS.279.4.1Cellselectionandreselection.279.4.2DPLMNCellinformationgathering.279.4.3CTSlocalmobility.289.4.3.1CTSattachment.289.4.3.2CTSdetachment.299.5FunctionsrelatedtoactivemodesupportofCTS.299.5.1MSconnectionestablishmentforMTandMOcalls.299.5.2Handover.299.6Overviewofsignalling.3010CTSArchitecture.3010.1CTSElements.3010.1.1CTSFixedPart.3010.1.2CTSMobileStation.3010.1.3CTScontrollingandsupportingnetworkentities.3110.2CTSInterfaces.3210.2.1CTSRadioInterface(Um*).3210.2.2GSMRadioInterface(Um).3210.2.3CTSAccessNetworkInterface.3210.2.3.1PhysicalcharacteristicsoftheCTSFixedNetworkInterface.3210.2.3.2PhysicalcharacteristicsoftheCTSGSMNetworkInterface.3210.2.4Networkinternalinterfaces.3210.2.4.1InterfaceCTSSN/CTSHLR(Cd).32SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)5(GSM03.56version7.1.1Release1998)10.2.4.2InterfaceCTSSN/CTSHLR(Cd').3210.2.4.3InterfaceCTSSN/CTSFRA.3210.2.4.4InterfaceCTSFRA/BSC.3210.3CTSsub-systems.3310.4NetworkAccess.3311CTSmainparameters.3311.1RadioResourceManagementparameters.3311.2Identificationparameters.3411.3Securityspecificparameters.3412ThelocalCTS.3412.1TransmissionandSignallingPlanes.3412.1.1TransmissionPlane.34History.35SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)6(GSM03.56version7.1.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).ThepresentdocumentwassubmittedtoPublicEnquirywiththeETSInumber301405.ForVotethenumberwaschangedto302405becausethenumber301405isreservedandwasallocatedaccidentally.Thepresentdocumentspecifiesthestage2descriptionoftheCTSservicewithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenberepublishedbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7IndicatesGSMPhase2+Release1998;xtheseconddigitisincrementedfortechnicalenhancements,corrections,updates,etcythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:21July2000DateoflatestannouncementofthisEN(doa):31October2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30April2001DateofwithdrawalofanyconflictingNationalStandard(dow):30April2001IntroductionThissystemarchitecturestage2descriptionispartoftheoverallstandardforaGSMbasedCordlessTelephonySystem(GSM-CTS).ThesystemisintendedtoprovideacordlessconnectionbetweenthePSTN/ISDNnetworkoraGSMnetworkandGSM-basedCTSMobileStations(GSM-MS)viaaprivateCTSFixedPart(CTS-FP).SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)7(GSM03.56version7.1.1Release1998)1ScopeThepresentdocumentdefinesthestage2descriptionfortheCordlessTelephonySystem(CTS)basedonGSMradio.Asthesecondstageofathree-levelstructure,itisderivedfromthestage1servicedescription.Asmentionedalreadyinthestage1description,aphasedapproachisindispensabletohaveanearlyfirstspecificationreadyformarketneeds.Thefirstphasefocusesontherequirementsnecessarytoelaboratetheradiointerfaceandthesecurityaspectsforanapplicationsupportingthespeechtele-service(includingDTMFsupport)inaresidentialsinglecellenvironment.ThestandardisationofthephysicallayersoftheGSM-CTSfixednetworkinterfaceisnotinthescopeofthepresentdocument.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:"AbbreviationsandAcronyms",Version5.0.0.[2]GSM02.56:"Digitalcellulartelecommunicationssystem(Phase2+),Phase1;GSMCordlessTelephonySystem(CTS),Phase1;ServiceDescription;Stage1".[3]GSM03.03"Digitalcellulartelecommunicationssystem(Phase2+);Numbering,addressingandidentification".[4]GSM03.20:"Digitalcellulartelecommunicationsystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1,Securityrelatednetworkfunctions;stage2".[5]GSM03.52"Digitalcellulartelecommunicationsystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1,LowerlayersoftheCTSradiointerface".[6]GSM03.40:"DigitalCellularTelecommunicationsSystem(Phase2+);TechnicalRealisationoftheShortMessageService(SMS)Point-to-Point(PP)".3Definitionsandabbreviations3.1DefinitionsBesidesthedefinitionsaccordingtotheCTSstage1servicedescription[2]thefollowingdefinitionsareapplicabletothepresentdocument:Fixednetwork:APSTNorISDNnetwork.Accessnetwork:thenetworkonwhichtheCTS-FPisconnectedandwhichcarriestheincomingandoutgoingcallstotheCTS-FP.ItcouldbeeitherafixednetworkoraGSMnetwork.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)8(GSM03.56version7.1.1Release1998)CTSradiointerface:TheradiointerfacebetweenCTS-MSandCTS-FP.CTS-MSIx:CTSLocalMobileSubscriberIdentityrelatedtothexthCTS-MSinitialisedonaCTS-FPCTS-MSattachment:CTS-MSattachmentisaprocedurewhichaCTS-MSinitiateswhentheCTS-MSdetectsthatitiswithincoverageofaCTS-FPtowhichtheCTS-MSisenrolled.CTS-MSdetachment:CTS-MSdetachmentisaprocedurethattheCTS-MSinitiates,andindicatestotheCTS-FPthattheCTS-MSwillbenolongerreachablebytheCTS-FP.Enrollment:TheprocedurebywhichaCTS-MSismadeknowntoaCTS-FPinorderthattheCTS-FPcanprovideCTSservice.3.2AbbreviationsThefollowinglistdescribestheabbreviationsandacronymsusedinthepresentdocument.TheGSMabbreviationsexplainedinGSM01.04[1]arenotincludedbelow.CTSCordlessTelephonySystemCTSFRACTSFrequencyallocationfunctionalentityCTSHLRCTSHomeLocationRegisterFunctionalentityCTS-FPCTS-FixedPartCTS-MSCTS-MobileStationCTS-MSICTSMobileSubscriberIdentityintheCTS-FPCTS-MSNCTSMobileStationNumberCTS-SAPCTSServiceAccessPointCTS-SIMCTSSubscriberIdentityModuleDPLMNDonorPLMNGFLGenericFrequencyList4Mainconcepts4.1CTSdefinitionTheCTSoperatorcanprovideaCTSservicewhichallows(usingamodifiedGSMradiointerface)toprovideacordlesstelephoneserviceattachedtothefixednetworkortoacellularnetwork.TheservicesofferedbyCTSarelimitedtothetypeofnetworktowhichtheCTS-FPisconnected.InordertoofferthisservicetheCTSoperatorneedstohaveanagreementwithaGSMoperatorinordertousethefrequenciesbelongingtohisPLMNbytheCTSFP.ThistypeofPLMNistermedtobeaDonorPLMN(DPLMN).NOTE:TheCTSoperatormaybeaGSMoperator.DependingupontheoperatoragreementsapersonwantingtooperateaCTS-FP(theCTSFPsubscriber)mayberequiredtohaveatleastthreesubscriptions:onewiththeCTSoperator,andonewiththeGSMoperator;andinadditiontothesesubscriptionstheCTSFPsubscriberneedstohaveeitherasubscriptiontoafixedorGSMoperatortowhichtheCTSFPistobeconnectedoraccesstoafixedlineinterface.ThefrequencieswhichtheCTSserviceusesmaybecontrolledbytheoperatorwhichholdsthelicensefortheGSMfrequencybandusedfortheservice.TheCTSFPsubscribercanhaveagreementswithotherCTSMSsubscriberstousehisbasestation.Therolemodelisdescribedin[2].4.2CTSNetworkACTSnetworkisdefinedtobemadeupofoneormoreCTScells.WhenaCTSnetworkhasmorethanonecellthesecellsaresynchronised(infrequency,atTDMAframeedgesandTDMAframenumber)ontheradiointerface.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)9(GSM03.56version7.1.1Release1998)4.3CTSRolemodels4.3.1CTSFPowner'srolemodelCTSOperatorDPLMNFixedOperatorCTSFPOwnerAgreementsSubscription123CTS-MSSubscriber54GSMoperator1OptionalsubscriptionsCTSrolemodelforaCTSFPsubscriberInordertoreceiveavalidCTS-GFLtheCTS-FPownerneedstohaveasubscription(2)withaCTSoperator.ThissubscriptionismaterialisedbyaCTS-SIMcardstoredintheCTS-FP.TheCTSoperatorhasanagreement(3)withaDPLMNpartofaGSMoperator1touseitsfrequenciesforCTSallocation.WhentheCTS-FPisusedinlicenceexemptmode,theCTS-FPownerdoesnotneedtohaveasubscription(2)withaCTSoperator.InthiscasethefrequencyallocationtoCTSusageismadedirectlybynationalauthorities.CTS-FPownershallalsoenrol(4)atleastoneCTS-MS,whichhasavalidGSMsubscription(5)withtheGSMoperator1.Inparallel,CTS-FPownerneedsasubscription(1)withanaccessnetworkoperatorinorderestablishcommunicationoverthenetwork.ThisaccessnetworkcouldbeeitherafixednetworkoraGSMnetworkdependingofCTS-FPcapabilities.WhentheCTS-FPisconnectedtoaGSMnetwork,thisGSMoperatordoesnotneedtohaveanyrelationwiththeGSMoperator1whoprovidesCTSfrequencies(DPLMN).4.3.2CTSMSsubscriber'srolemodelCTSFPOwnerAgreementsSubscriptionCTSMSSubscribersGSMOperator224531FMCserviceproviderCTSOperatorOptionalsubscriptions6CTSMSsubscriber'srolemodelTheCTS-MSsubscriberhasavalidsubscription(1)withaGSMoperatorwhoallowsCTSoperations.Incaseofroaming,theVPLMNshallconfirmtheauthorisationtodoCTSoperationstothisCTS-MS.TheCTSMSsubscriberhasagreement(2)withoneCTS-FPownerthatallowshimtoenrolonhisCTSFP.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)10(GSM03.56version7.1.1Release1998)InordertoenrolonaCTS-FP,aCTS-MSsubscribermayneedasubscription(3)withtheCTS-operatorwhocontrol(4)thisCTS-FP.ThisCTS-operatormayhaveanagreement(5)withtheGSM-operatorofthisCTS-MS.NOTE:thisGSMoperatormaybedifferentfromtheonewhoprovidesfrequenciestotheCTS-operator.InordertohaveaccesstovalueaddedFixedMobileConvergenceservices(e.g.unifiednumber),theCTS-MSsubscriberneedsasubscription(6)withaFMCserviceprovider.TheseservicesandthissubscriptionareoutsideofthescopeoftheGSM-CTSstandard.4.4CTSRadiointerfaceTheCTSradiointerfaceisbasedontheuseofamodifiedGSMradiointerfaceasspecifiedin[5].TheconceptistoconstructamodifiedGSMradiointerfacewhichrequiresnochangeofMEhardware,onlysoftwareneedbechanged.ThemodifiedGSMradiointerfaceshall(onbothuplinkanddownlink)onlycauseminimaldisturbancetotheDPLMN.Inordertoachievethis,threeconceptshavebeenadopted:• AmodifiedlowpowerradiointerfaceusingGSMburstformatsthatcauselimiteddisturbancetopresentGSMmobilesandinfrastructure,see[5];• AdaptiveFrequencyAllocation(AFA),see[5];• TotalFrequencyHopping(TFH),see[5].4.4.1AdaptiveFrequencyAllocationInordertominimiseinterferencebetweenCTSnetworksandGSMnetworks,anAdaptiveFrequencyAllocation(AFA)mechanismisadopted,wherebytheCTSFPchoosesfrequencieswithinavalidGFLwheretheuplinkanddownlinkisinterferedtheleast.Theconceptandthemechanismsusedaredescribedinmoredetailin[5].4.4.2TotalFrequencyHoppingToreducefurtherthepossibilityofinterference(withtheGSMPLMNsandothersCTS-FP/MSpairs)aTotalFrequencyHopping(TFH)mechanismisadopted.TheconceptofTFHandthemechanismsusedaredescribedinmoredetailin[5].4.4.3CTSandGSMcompatibilityissuesCTSservicecannotbeofferedtoexistingmobileimplementationswithoutachangeofsoftware.CompatibilityissuesforGSMmobileswhicharenotoperatinginCTSmodemaybesolvedbytwoways:• theCTSradiointerfaceisdesignedinordertocreateminimumdisturbancetoexistingmobileimplementationsasspecifiedin[5];• andbyofferingtheGSMoperatorcontroloverthefrequenciesusedforCTSoperation.4.5CTSoperationalrequirementsTheCTSoperatortogetherwithagreementsfromtheGSMoperatorcandefinethecoverageconditionsunderwhichCTSservicecanbeofferedtothesubscriber.Thefollowingcoverageconditionsareidentified:• GSMcoveragefromtheDPLMN.ThatistosaywherethecoverageoftheDPLMNmeetsthecell(re)selectioncriteriaforobtainingDPLMNservice.• LimitedcoveragefromtheDPLMN.ThatistosaywherethecoverageoftheDPLMNdoesn'tmeetcell(re)selectioncriteriaforobtainingservicewheretheCTS-FPisinstalled.• NoGSMcoveragefromtheDPLMN.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)11(GSM03.56version7.1.1Release1998)4.5.1GSMcoveragefromDPLMNInthiscasetheCTSFP'scoverageisfullywithinthecoverageoftheDPLMN.CTSFPDPLMNFigure1:GSMcoveragefromDPLMN4.5.2LimitedGSMcoveragefromDPLMNTwocasesareidentified.CTSFPDPLMNFigure2:LimitedGSMcoveragefromDPLMNThecoverageoftheDPLMNispartiallyachievedintherangeoftheCTSFP.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)12(GSM03.56version7.1.1Release1998)CTSFPDPLMNTTransportFigure3:LimitedcoveragefromDPLMNwithinTTRANSPORTThecoverageoftheDPLMNisnotachievedintherangeoftheCTSFPbutislocatedwithinadistance,suchthat,thetimeittakesbetweenlossofcontactfromtheDPLMNtothetimetheCTSMScanbebroughtintocoverageoftheCTSFPiswithinT_TRANSPORT.4.5.3NoGSMcoveragefromDPLMNThetimebetweenleavingDPLMNandenteringtheCTSFPcoverageislongerthanT_TRANSPORT.CTSFPDPLMNTTransportFigure4:NoGSMcoverage4.6CTSReferenceModel4.6.1GeneralCTSReferenceModelThegeneralreferencemodeloftheCTSservicehasthefollowingadditionalnetworkelements:• theCTS-HLRisthefunctionalentityhandlingCTS-FPsubscriptions;SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)13(GSM03.56version7.1.1Release1998)• theCTS-SNisthefunctionalentityperformingthecommunicationwithCTS-FPviatheCfinterfacewhichusesthefixednetworkasabearer.TheCd'interfacebetweenCTS-SNandCTS-HLRisusedforsubscriptioncontroloftheCTSFPSIM.TheCTS-SNhasaninterface(Cd)totheGSMHLRinordertoreceivethechallenge/responsepairsforauthenticationoftheGSMSIMwhenauthenticationoftheGSMSIMisrequiredtobeperformedviathefixednetwork;• theCTS-FRAisthefunctionalentityhandlingtheCTSfrequencyallocation;• theLocalExchange(isapartofthefixednetwork),itisaccessedbytheCTS-MSviatheCTS-FPforusercommunication.TheLocalExchangemaybeusedasabearertoprovidedialoguebetweenCTS-SNtoCTS-FPandCTS-SNtoCTS-MS.LocalExchangeCTS-MSMESIMCfUm*CTS-SNCTS-FRABSCMSC/VLRBTSCd’CTS-HLRHLRAuCCdCTS-FPUmUsercommunicationCTSapplicationsignallingusingGSMbearers(e.g.SMS)andfixednetworkbearers(e.g.V23)SignallingonstandardisedinterfaceSignallingonproprietaryinterfacesSignallingontobestandardisedinterfacesSIMCTS-AuCFigure5:CTSreferencemodel4.6.2SimplifiedCTSreferencemodel(limitedenrolmentcontrol)InitialCTSintroductionshouldmayallowaneasyintroductionoftheservice.ThissectiondealswithsimplifiedCTSreferencemodel.SimplificationoftheCTSreferencemodelcanbeachievediftheCTSoperatorchoosesthatenrolmentisonlycheckedlocallyintheCTS-FPseesection4.9.1EnrolmentcontrolattheCTS-FP.InthissimplifiedmodeofoperationtheCTS-FPSIM(whichisprogrammedbytheCTSoperator)holdsinformationastowhichIMSIrangescanbeacceptedforenrolment.InthecasewheretheIMSIofaCTS-MSisnotwithintheranges,thentheenrolmentoftheCTS-MSisrefusedbytheCTS-FP.SecurityforthoseCTS-MSwhichcanbeenrolledisassuredattheCTS-FPbylocalsecurityproceduresasspecifiedin[4].SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)14(GSM03.56version7.1.1Release1998)InthiscaseauthenticationoftheCTS-MSbytheCTS-SNcanbeavoidedandthustheinterfacebetweentheCTS-SNandGSM-HLRneednotbeimplemented.ThesimplifiedCTSreferencemodelisshownbelow.LocalExchangeCTS-MSMESIMCfUm*CTS-SNCTS-FRABSCMSC/VLRBTSCd’CTS-HLRCTS-FPUmUsercommunicationCTSapplicationsignallingusingGSMbearers(e.g.SMS)andfixednetworkbearers(e.g.V23)SignallingonstandardisedinterfaceSignallingonproprietaryinterfacesSignallingontobestandardisedinterfacesSIMAuCFigure6:SimplifiedCTSreferencemodel(limitedenrolmentcontrol)4.6.3SimplifiedCTSreferencemodel(LicenceexemptCTSband)ThissectionisrelativetotheusageofCTScapabledeviceswithaCTSlicenseexemptradioband.InthiscasethefrequencyallocationforCTSusageisdefineddirectlybynationalauthorities.AlltheradioinformationrelativetoCTSusagearestoredintheCTS-FPbytheCTS-FPmanufacturer.TheseradioinformationarelinkedwithageographicalinformationwhichinformstheCTS-FPinwhichcountry(orregion)thesefrequenciescanbeused.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)15(GSM03.56version7.1.1Release1998)LocalExchangeCTS-MSMESIMCfUm*BSCMSC/VLRBTSCTS-FPUmUsercommunicationSignallingonstandardisedinterfaceSignallingonproprietaryinterfacesSignallingontobestandardisedinterfacesWhentheCTS-FPisusedinlicenceexemptmode,theCTS-FPownerdoesnotneedtohaveasubscriptionwithaCTSoperator.ThereforetheCTS-FPcanworkwithoutCTS-SIMcardandnoexchangewithaCTS-SNisnecessary.HoweverwhenaCTS-SIMcardisinsertedintheCTS-FP,theCTS-FPshallnomoreconsidertheCTSlicenceexemptinformationstoredinitsmemory,andshallworkoperateinlicencemode.TheCTSmobileisnotinformedaboutthestatusofthefrequencyusedforCTS(i.e.licensedorlicenceexempt).Themobileoperationsarethesameinbothcases.AsinlicensedmodealltheCTSoperationsmadebythemobileareconditionedtothereceptionbytheMSofthe"CTSallowed"informationsentbytheV-MSC(seechapter9.2)4.6.4CTSconnectedtoPLMNreferencemodelInthecaseofaCTS-FPconnectedtoaGSMnetworkthegeneralreferencemodelismodifiedasdescribedbelow:SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)16(GSM03.56version7.1.1Release1998)CTS-MSMESIMCsUm*CTS-SNCTS-FRABSCMSC/VLRBTSCd’CTS-HLRHLRAuCCdCTS-FPUmUsercommunicationCTSapplicationsignallingusingGSMbearers(e.g.SMS)andfixednetworkbearers(e.g.V23)SignallingonstandardisedinterfaceSignallingonproprietaryinterfacesSignallingontobestandardisedinterfacesSIM-CTSCTS-AuCSIM-GSMUmFigure7:SimplifiedCTSreferencemodel(limitedenrolmentcontrol)TheCfinterfacebetweentheCTS-FPandthefixednetworkisreplacedbyaGSMstandardUminterfacewithaGSMnetwork.OnthisUminterfacetheCTS-FPisconsideredbytheGSMnetworkasastandardGSMMS:ieaGSM-MEwithavalidGSMSIMcard.ItispossiblethattheGSMnetworkonwhichtheCTS-FPisconnectedisdifferentfromtheoneusedbyCTS-MS.AlltheexchangebetweentheCTS-SNandtheCTS-FParemadeviaastandardGSMcircuitswitcheddataconnection,andusingthesameapplicationsignallingthantheonedefinedfortheCTSconnectedtoPSTN.TheCsinterfacebetweentheCTS-SNandtheMSC,willbethemostappropriatelinktosupportthiscircuitswitcheddatastream.Themodificationsduetosimplifiedenrolmentcontrol(section4.5.2)arealsoapplicableisthecaseofCTSconnectedtoPLMN.4.7GSMOperatorcontrolofCTSserviceTheGSMoperatorhascontroloftheCTSservicethatisoperatinginhisPLMN.Thestage3CTSspecificationsshallensurethatitshallnotbepossiletooperateaCTSservicewithoutthepermissionoftheGSMoperator.WhenaCTScapablemobileaccessesaGSMPLMNitwillbeprovidedwithinformationinordertoallowtheMStooperateCTSwithintheGSMPLMN.ThismaybeprovidedtoallCTS_MSoronaperCTS-MSbasisdependingontheGSMoperatorsrequirements.IfnoinformationisprovidedforCTSoperationthentheCTSMSisprohibitedfromfromoperatinginCTSmode.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)17(GSM03.56version7.1.1Release1998)4.7.1CTSSystemcontrolControloftheCTSoperationdependsofthefrequencyscenarioofthecountry(orregion)inwhichCTSserviceistobeprovided.Twoscenariosareforeseen:• licenceexemptfrequencybandisusedforCTSoperation;thisiswheretherelevantauthorityinacountry(orregion)hasallocatedafrequencybandforCTSserviceandtheCTS-FPcandeterminethatitisinthatcountry(orregion);and• sharedfrequencybandsforCTSoperation;thisiswhereaGSMoperatorinacountryhasallocatedpartofhisfrequencyforCTSservice.4.7.2GSMOperatorcontrolofCTSfrequencylistOneofthemajorconceptsofCTSisthecontrolofthefrequenciesforusebytheCTS-FPs.ThefrequencyallocationforCTSoperationistermedtheGFL(GenericFrequencyList).TheGFListhefrequencyallocationthateitheraGSMoperatorhasagreedtogivetotheCTSoperatorfortheoperationofaCTSservicewithinaspecificgeographicalareaforaspecificperiodoftimeoradedicatedfrequencyallocationforCTSoperation.TheGFLismadeupofavalidperiodandoneormorefrequencyinformation.[Editor'snote:frequencyinformationmaybevalidforspecificperiodsoftimeduringtheday(operationalperiod).InthiscasetheclockintheCTS-FPintheCTS-MSshouldbealignedwiththeDPLMN;thiscouldbedonee.g.byusingtheGSMNITZprocedurewhichgivesextramobilityinformationoneofwhichisthelocaltime]ThediagrambelowrepresentsthestructureofaGFL.ForaGFLtobevaliditmusthaveacurrentvalidperiod.AGFLFrequencyinformationconsistsofHasoneormorefrequencyInformationAGFLHas1validperiodanoperationalperiodGFLValidperiodFrequencyInformationOperationalperiodFrequencylist&anassociatedfrequencylistFigure8:GFLstructureSIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)18(GSM03.56version7.1.1Release1998)TheinitialisationofaCTS-FPrequiresaGFLtobegiventoaCTS-FP.InsomecasestheGFLneedstobecontrolledbasedonlocationinformationwithintheGSMPLMN.InformationonthepositionoftheCTS-FPwithintheDPLMNmayberequestedtoallocatethecorrectGFL.AstheCTS-FParchitecturehasnocapabilitytotransmitandreceivelikeanormalGSMMS,itcannotcarryoutadirectdialogueusingtheUminterfacewiththeGSMDPLMNandthusitsgeneralpositioncannotbeascertainedwithoutthehelpoftheCTS-MS.ThereforetheCTS-MSisusedtoprovidepositionalinformationthatcanbeusedbytheDPLMNtoallocateaGFLtotheCTS-FP.InorderthatbothDPLMNcoverageandlimitedDPLMNcoveragescenariosarecateredfor,avaliditytimeconceptisintroducedduringwhichpositionalinformationprovidedbytheCTSMSisdeemedvalid.ThisallowstheCTS-FPlocationtobeascertainedandthustheallocationoftheGFLtotheCTS-FPcanbemade.4.7.3CTSsysteminitialisationforlicenseexemptfrequencybandforCTSoperationInthiscasethefrequencyallocationforCTSusageisdefineddirectlybynationalauthorities.AlltheradioinformationrelativetoCTSusagearestoredintheCTS-FPbytheCTS-FPmanufacturer.TheseradioinformationarelinkedwithageographicalinformationwhichinformstheCTS-FPinwhichcountry(orregion)thesefrequenciescanbeused.WhentheCTS-FPisconnectedtobothmainspowerandpowersupply,theCTS-FPcanstarttomakeCTSoperations(transmitandreceivedradioburstsaccordingwithGSM-CTSspecification,enrolledCTS-MS,establishcallwithPSTNnetwork,…).Alltheseoperationsaremadeinrespectwiththeradioinformation(mainlytheCTS-GFL)definedbynationalauthoritiesandstoredintheCTS-FP.4.7.4CTSsysteminitialisationwithDPLMNcoverageandlimitedcoverageInordertoavoidthattheCTSservicebetoocumbersometoown,theinitialisationoftheCTSFPissuchthatthepreciseGFLforCTSoperationalpurposesmaybeobtainedsometimeafterCTSoperationhasbeenstarted.ThismeansthatforashortperiodoftimetheCTS-FPneednotbeusingtheGFLthatisbestsuitedtotheDPLMNenvironmentinwhichtheCTS-FPislocated.DuringthisperiodtheCTS-FPshalloperateusingareducedpoweroutput.4.7.4.1FirststageCTS-FPinitialisation(TemporaryGFLallocation)TheCTS-FPSIMshallhaveatelephonenumberwhichispreloadedbytheCTSoperatorwhentheserviceissubscribed.ThisTelephonenumberisusedbytheCTS-FPtocalltheCTS-SN.TheCTS-SNcanverifythevalidityofthesubscriptionandperformauthenticationoftheCTS-FPatthisstage.TheCTS-FPshallalsoperformthemutualauthenticationproceduresasdefinedinref[4].InmostcaseslocationinformationwillnotbeavailableonthefirstinitialisationandthustheCTS-SN/CTS-FRAshouldallocateaTemporaryGFLtoallowoperationoftheUm*interface.TheCTS-SNcanalsopassextrainformationinordertocontrolotheroperationalmodesoftheCTS-FP.AspartoftheGFLmaintenancetheCTS-FPwillbeaskedtocallbacktheCTS-SNbeforetheexpiryofthetemporaryGFL.TheCTS-FPisnowabletooperateandprovideCTSservicesusingaTemporaryGFL.TheCTS-MSneednotbepresentduringthisoperation.4.7.4.2SecondstageCTS-FPinitialisation(GFLconfirmation)AspartofthesignallingprocedurestheCTS-FPshalldemandtheCTS-MStoprovidelocationinformationtotheCTS-FPsee"9.1.2UpdateofCTSFPfrequencies".TheCTS-FPstoresthisinformationandprovidesittotheCTS-SNthenexttimetheCTS-FPcontactstheCTS-SN.TheCTS-SN/CTS-FRAusesthisinformationtoallocate/maintaintheGFLforCTSoperation.4.7.5CTSsysteminitialisationwithoutDPLMNcoverageTheinitialisationofaGFLwithoutDPLMNcoverageisFFS.SIST EN 302 405 V7.1.1:2003

ETSIETSIEN302405V7.1.1(2000-08)19(GSM03.56version7.1.1Release1998)4.7.6GFLupdateOnceaGFLisconfirmed,theGFLmaybeupdatedbytheoperatoraspartoftheregularchangeshemakesinhisfrequencyplanofthenetwork.4.7.6.1CTSFPGFLupdateSubsequentGFLallocationsneednotinvolvetheCTS-MSandcanbemadedirectlybydialoguebetweentheCTS–FPandtheCTS-SN.InorderthatfrequencyplanningoftheDPLMNcanbetakenintoaccountwhentheGFLisupdatedtheCTS-FPwiththehelpoftheCTS-MS(s)collectstheidentityofDPLMNcellswhichsurroundtheCTS-FPandreportthisinformationtotheCTS-SNasandwhencontacttotheCTS-FPismade.ThesecellsaregivenbytheCTS-FPtotheCTS-SNnetworkwhendemandedandareusedbythenetworkinthereallocationoftheGFL.TheCTS-MSsroleinthisinformationgatheringistorememberthelastcell(s)andtimethatitcampedonbeforeattachingtotheCTSFP.GFLupdateiscontrolledbytheCTSSN.ThesubsequentGFLallocationallows:• ConfirmationofthelocationoftheCTSFP;• MutualauthenticationoftheCTSFPandCTSSN(03.20);• ReallocationoftheGFLisbasedontheanalysisofthecellidentitiesandtimestampinformationandtheT_TRANSPORTtimervaluebytheCTS-FRA.ThenewGFLisvalidwhentheoldGFLexpiresunlessotherwisespecifiedbytheCTS-SN.ItshouldbealsopossibletoupdatetheoldGFLduringthisprocedure.TheCTSFPshallhandlethetwoGFLssimultaneouslyandisresponsibleforupdatingtheCTSfrequencieswiththemobilesthatareenrolled,asandwhen,theycontacttheCTSFP.4.7.7ErasureofGFLintheCTSFPTheCTSFPwilleraseaGFLwhentheperiodofvalidityforaGFLexpires.4.8De-initialisationofCTSFP4.8.1CTSOperatorcontrolmodeACTSFPwillbecomede-initialisediftheCTSFPis:• Disconnectedfromthemainspowerforaperiodoftime[10minutes];and/or• DisconnectedfromthePSTNconnectionforaperiodoftime[10minutes];and/or• WhentheCTS-SIMisremovedfromtheCTS-FP;• WhenspecificallycommandedbyCTSSN.InadditiontothisaCTS-FPwillde-initialiseitselfifafterinitialisationthereisnovalidattachmentrece
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