ETSI EN 302 403 V7.2.1 (2000-08)

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; Service description; Stage 1 (GSM 02.56 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 302 403 Version 7.2.1SIST EN 302 403 V7.2.1:2003en01-december-2003SIST EN 302 403 V7.2.1:2003SLOVENSKI
STANDARD



SIST EN 302 403 V7.2.1:2003



ETSIEN302403V7.2.1(2000-08)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);GSMCordlessTelephonySystem(CTS),Phase1;Servicedescription;Stage1(GSM02.56version7.2.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)2(GSM02.56version7.2.1Release1998)ReferenceDEN/SMG-010256Q7KeywordsDigitalcellulartelecommunicationssystem,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 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)3(GSM02.56version7.2.1Release1998)ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Description.94.1Systemoverview.94.2Serviceaspects.104.2.1General.104.2.2Useraspects.104.2.3Subscriptions.114.2.3.1CTS-roamingaspects.114.2.3.2WithdrawalofCTSsubscription.114.2.4GSMcoverage.124.2.5Mobility.124.2.5.1ModeselectionbetweenCTSandPLMN.124.2.5.2AttachmentofthesameCTS-MSwithmultipleCTS-FPs.124.2.5.3AttachmentofmultipleCTS-MSswiththesameCTS-FP.134.2.5.4AttachmentstatusofaCTS-MS.134.2.6CTSapplications.134.2.6.1Tele-services.134.2.6.2Supplementaryservices.134.2.6.3Additionalsupportforfixednetworksupplementaryservices.144.2.6.4ManMachineInterface(MMI).144.2.6.5CTSinternalcalls.144.2.6.6CTSinternalcalltransfer.144.2.6.7CTSinternalcallhold.144.2.6.8Mobilehunting.144.2.6.9SMS-MT.144.2.6.10SMS-MO.144.2.6.11Otherservices.144.3RadiointerfaceandGSMco-existenceaspects.144.3.1Generalprinciples.144.3.2Broadcastchannelfunctionality.154.4Securityrequirements.154.4.1General.154.4.2Enrolment.154.4.3Attachment.164.4.4Protectionofcommunications.164.4.5SecurityParameterStorageRequirements.164.4.6De-activation.165NormalProcedures.165.1EnrolmentofCTS-FP.165.1.1CTSoperatorprocedureforenrolmentofCTS-FP.165.1.2UserprocedureforenrolmentofCTS-FP.175.2EnrolmentofCTS-MSs.175.3De-enrolmentofaCTS-MS.185.4AttachmentofCTS-MS.185.5Callprocedures.185.5.1CTS-MSoriginatedcalls.18SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)4(GSM02.56version7.2.1Release1998)5.5.1.1NumbercompatibilitybetweenGSMformatsandfixednetworkformats.185.5.2CTS-MSterminatedcalls.195.5.3CTSinternalcalls(optional).195.5.4CTSinternalcalltransfer(optional).205.6Maintenance.206CTSde-activation.206.1CTS-FPde-activationbytheCTSoperator.206.2CTS-FPde-activationbytheuser.206.3CTS-FPde-activationbyselfcontrollingfeatures.206.4CTS-MSde-activationbytheCTSoperator.217Exceptionalprocedures.218Chargingaspects.219CrossPhaseCompatibility.21AnnexA(informative):LaterphasesofCTS.22AnnexB(informative):Changehistory.23History.24SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)5(GSM02.56version7.2.1Release1998)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).ThepresentdocumentwassubmittedtoPublicEnquirywiththeETSInumber301403.Forvotethenumberwaschangedto302403becausethenumber301403isreservedandwasallocatedaccidentally.Thepresentdocumentspecifiesthestage1descriptionfortheCordlessTelephonySystem(CTS)withinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocument,itwillbere-releasedbySMGwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7IndicatesGSMPhase2+Release1998;xtheseconddigitisincrementedfortechnicalenhancements,corrections,updates,etcythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:21July2000DateoflatestannouncementofthisEN(doa):31October2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30April2001DateofwithdrawalofanyconflictingNationalStandard(dow):30April2001SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)6(GSM02.56version7.2.1Release1998)IntroductionToday,thereexistsacleardistinctionbetweenthepublicmobiletelephonesystemsforwideareacoverageontheonehand,andprivatecordlesstelephonesystemsforlocalareacoverageontheotherhand.Recently,attemptshavebeenmadetointegratethewideareacellularandthelocalareacordlessfunctionintooneandthesameMobileEquipment(ME).However,becauseoftheincompatibilitybetweentheexistingcellularandcordlessstandards,thisresultsinMEimplementationswithratherlowcost-efficiency.TheintentionoftheGSMCordlessTelephonySystem(CTS)isthereforetoprovidecordlessfunctionalitytoastandardGSMMobileStation(MS)withminimumimpactontheMS.TheimpactwouldideallybelimitedtoanupgradeoftheMEandSIMsoftware.Thiscanonlybeaccomplishediftheradiointerfaceofthecordlesssystemisidentical,orverysimilar,tothestandardGSMradiointerface.SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)7(GSM02.56version7.2.1Release1998)1ScopeThescopeofthepresentdocumentistodescribetheServiceaspectsofaGSMCordlessTelephonySystem(CTS),whichprovidesthepossibilityforusersofGSMterminalstohavecordlessaccesstoafixednetwork,suchasPSTN/ISDNoraradionetworksuchasGSM.Duetothetimeconstraintstohaveafirstspecificationreadyformarketneeds,aphasedapproachisnecessary.Thefirstphaseaimsprimarilyatanapplicationsupportingthespeechteleservice(includingDTMFsupport)inaresidentialsinglecellenvironment.Thefocusisontherequirementsnecessarytoelaboratetheradiointerfaceandthesecurityaspectsforsuchanapplication.TonotpreventorimpedetheevolutionofCTStoadditionalservicesandfunctions,laterphasesmayhavetobeconsideredwhennowdefiningthemeanstofulfiltheabovementionedrequirementsforthefirstphaseofCTS.Therefore,additionalsupportontheCTSradiointerfaceforlaterphaseservices(e.g.SMS,subscriberauthenticationandGSMsupplementaryservices),isincludedalreadyinCTSPhase1,providedthatsuchservicesareclearlydefined.OtherexpectedservicesandfunctionsinlaterphasesareincludedinAnnexA.ThestandardisationofthephysicallayersoftheGSM-CTSfixednetworkinterfaceisnotinthescopeofthepresentdocument.However,considerationmayneedtobegiventocommunicationofapplicationdatabetweenCTSandPLMNviathefixednetwork.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]GSM02.07:"Digitalcellulartelecommunicationssystem(Phase2+);MobileStations(MS)features".[3]GSM02.09:"Digitalcellulartelecommunicationssystem(Phase2+);Securityaspects".[4]GSM02.81:"Digitalcellulartelecommunicationsystem(Phase2+);LineidentificationSupplementaryServices-Stage1".[5]GSM02.96:"Digitalcellulartelecommunicationsystem(Phase2+);NameidentificationSupplementaryServices-Stage1".[6]GSM03.40:"Digitalcellulartelecommunicationssystem(Phase2+);ShortMessageService(SMS)".[7]ETSIETS300111(1992):"IntegratedServicesDigitalNetwork(ISDN);Telephony3,1kHzteleservice,servicedescription".[8]ETSIETS300109(1992):"IntegratedServicesDigitalNetwork(ISDN);Circuit-mode64kbit/s8kHzstructuredbearerservicecategoryusableforspeechinformationtransfer;Servicedescription".SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)8(GSM02.56version7.2.1Release1998)[9]ETSIETS300110(1992):"IntegratedServicesDigitalNetwork(ISDN);Circuit-mode64kbit/s8kHzstructuredbearerservicecategoryusablefor3,1kHzaudioinformationtransfer;Servicedescription".[10]ETSIEN301144-1V1.1.1(1998-01):"TheSignallingapplicationforthemobilitymanagementserviceonthealphainterface;Part1:Protocolspecification".[11]GSM02.30:"Digitalcellulartelecommunicationsystem(Phase2+);ManMachineInterface(MMI)oftheMobileStation(MS)".[12]GSM05.05:"Europeandigitalcellulartelecommunicationsystem(Phase2+);Radiotransmissionandreception".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:FPEnrolment:TheprocedurewhereaCTS-FPisloadedwithdatanecessarytoobtainCTSoperation.AfterthisprocedureCTSoperationmaycommence.MSEnrolment:TheprocedurewhereaCTS-MSisassociatedforthefirsttimewithaCTS-FP.AfterthisprocedureCTS-MShasaccesstothisCTS-FP.Attachment:TheprocedurewhereanMSattachestoacertainCTS-FP.Whenattached,itispossibletomakeandreceivecallsviatheCTS-FP.TheCTS-MSmusthavebeeninitialisedcorrectlytotheCTS-FPbeforeattachmentcantakepart.GenericFrequencyList(GFL):TheGenericFrequencyList(GFL)containsallabsoluteradiofrequencychannelnumbers(ARFCN),asdefinedinGSM05.05,onwhichtheCTS-FPisallowedtooperate.TheCTS-FPwillneverusefrequencieswhicharenotlistedintheGFL.CTSMobileStation:AGSMMSwithCTScapability.CTSFixedPart:TheCTS-FPisadevicewhichoffersapersonnalcordlesscoverageandactsasalinkbetweentheCTS-MSandthefixednetworkortheGSMnetwork.GSMOperator:TheGSMoperatoristheoperatorwhoprovidesGSMcellularservicetotheMS.CTSlicenceexemptfrequencies:AfrequencybandthatmaybeallocatedbynationalregulatortoCTSusageoutsideofaGSMlicenceallocatedtoaGSMoperator.CTSoperator:TheCTSoperatoristheoperatorwhoprovidestheGFLtotheCTS-FP.TheCTSoperatormaybethesamethantheGSMoperator.FP-SIM:TheFP-SIMistheSIMcardinsertedintheCTS-FP,whichmaterialisedtheCTSsubscription.TheFP-SIMbelongstotheCTSoperator.CTSsubscription:WhenaGSMlicensedbandisused,therighttouseaCTSoperator'sfrequencyspectrumforcommunicationbetweenaCTS-FPandCTS-MS(s).CTS-FPowner:ApersonwhohastheCTS-FPcontrolandmayauthoriseMSEnrolment.CTSuser:ApersonwhohasaCTS-MSwhichisallowedtodoCTSoperations.CTS-MSlocalnumber:Anumberintherangeof0-99optionallyassignedtotheCTS-MSatenrolment.ThisnumberisusedforCTSinternalcalls.CTS-Roaming:TherightforanadditionalCTS-MStobeenrolledtoaCTS-FPwhichisinitialisedtoanoperatorotherthantheHPLMNoperatoroftheadditionalCTS-MS.SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)9(GSM02.56version7.2.1Release1998)3.2AbbreviationsInadditiontothosebelow,abbreviationsusedinthepresentdocumentarelistedinGSM01.04.CTSCordlessTelephonySystemCTS-FPCordlessTelephonySystem-FixedPartCTS-MSCordlessTelephonySystem-MobileStationFP–SIMFixedPart–SubscriberIdentityModuleGFLGenericFrequencyListIFPEIInternationalFixedPartEquipmentIdentityISDNIntegratedServicesDigitalNetworkMSMobileStationPSTNPublicSwitchedTelephoneNetworkSMS-MOShortMessageService-MobileOriginatedSMS-MTShortMessageService-MobileTerminated4Description4.1SystemoverviewTheGSMCordlessTelephoneSystem(GSM-CTS)describedinthepresentdocumentisaradiocommunicationssystembasedonaGSM-compatiblecellularinterfacebetweenaprivateradiobasestationcalledCTSFixedPart(CTS-FP)andaCTSmobilestation(CTS-MS).TheCTS-FPisconnectedeitherviaawirelinetothePSTN/ISDNnetworkorviaaradioconnectiontoaGSMnetwork.Whenconnectedtothefixednetwork,theCTS-FPwillbecompliantwiththeexistingfixednetworkstandards(e.g.supportthetelephony3,1kHzteleservice(see[7]),thespeechbearerservice(see[8])andthe3,1kHzaudiobearerservice(see[9]incaseofanISDNCTS-FPandtherelevantnationalstandardsincaseofPSTNCTS-FP).ThereisnodirectradiocommunicationbetweendifferentCTS-FPs.However,thisdoesnotprecludeindirectcommunication,e.g.viathefixednetworkorviatheMS.WhenconnectedtoaGSMnetwork,theCTS-FPiscompliantwiththeexistingETSIstandardsapplicabletoaGSMmobile.FromtheGSMnetworkpointofview,theCTS-FPisseenasastandardGSMmobileincludingastandardGSMSIMcard.(i.e.theCTS-FPmayinclude2SIMcards:onefortheGSMsubscriptionandonefortheCTSsubscription).AnillustrationoftheCTSconceptisshowninfigure1.DuetothelowtransmitpoweroftheCTS-FP,thecoverageareaisrestrictedandlimited.WhentheCTS-MScomesinrangeoftheCTS-FP,itmayattachtotheCTS.Whenconnectedtothefixednetwork,fromthenon,theusercanmakeandacceptcallsdirectlyviathePSTNwithouttheinterventionofthepubliccellularnetwork.Whenattached,theMScheckswhetheritisstillinrangeoftheCTSandwhetheritispaged.Asanoption,theMSmaysimultaneouslyworkinboththecellularandthecordlessmode,inasocalledparallelmode,i.e.beattachedbothintheGSMPLMNandtheCTS.WhentheMScomesoutofrangeoftheCTSitmayswitchtotheGSMmode.Thisswitchshallbeindicatedtotheuser.WhentheCTS-MSisineitherCTSmodeorGSMmodeandissearchingforapotentialchanneltoattachwithintheothermode,itshallbeabletorespondtopagingmessagesfromthemodeinwhichitiscurrentlyattached.TheradiointerfacebetweentheCTS-FPandtheCTS-MSisamodifiedGSMinterface.Thecarrierfrequenciesusedarethesameasassignedforcellularservice.Thesecarrierfrequenciescanbepartofalicenceexemptbandoralicensedband.WhenCTS-FPoperatesinalicencedband:-thesefrequenciescanbereservedbytheoperatorforGSM-CTSusage,orcanbesharedwiththecellularsystem.Ineverycase,however,theGSMoperatorcontrols,onanareaandtimebasis,onwhichfrequenciestheCTSisallowedtooperate.Incaseofco-existenceinthesameoperatingarea,aprocedureshallbedeployedtominimiseinterferencebetweenGSMPLMNandCTSusers.NOTE:ThefrequenciesusedforCTScouldbeinanyfrequencybanddefinedforGSM,i.e.GSM900,DCS1800orPCS1900.ThisappliesbothtotheCTS-FPandtheCTS-MS.SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)10(GSM02.56version7.2.1Release1998)Thequalityofservice(e.g.serviceaccessibility,callset-uptime,bitratefordataservices)ofthe'GSMonly'subscribersshallremainunaffectedbytheintroductionofCTS.MeanstoguaranteethatthequalityofserviceofGSMsubscribersdoesnotdegradeduetoCTSintroductionhavetobedefined.SincetheMSusesthesamefrequencyspectrumbothforthecellularmodeandthecordlessmode,theMEhardwarecanbereused.TheintentionisthathardwaremodificationsintheradiotransceiverofastandardGSMMEshouldnotbenecessary.ItisalsoarequirementthattheintroductionofCTSshallnotdestabiliseanyexistingGSMmobileequipmentordegradethemobileequipment'sdedicated(e.g.incall)oridlemodeperformance.Whenalicensedbandisused:theCTSoperatorcanadministerallCTS-FPsandthecorrespondingCTS.WhentheCTSisinitialised,therequiredoperationparametersaredownloadedintotheCTS.ThiscaneitherbedoneviathefixednetworkorviatheGSMradiointerface.CTSFixedPartGSMPLMNGSMCTSGSMBTSFigure1:ConceptfortheGSMCTSfunctionalitywhenconnectedtothePSTN4.2Serviceaspects4.2.1GeneralInthefirstphaseofCTSanapplicationforresidentialenvironmentservingonecellisintended.Theservicesandfeaturestobesupportedrelatetothisassumption.4.2.2UseraspectsTheuseroftheCTSshallberequiredtoperformasimpleinstallationprocessinordertoinitialisetheCTSoperation.Thisprocessshallinclude:• ConnectionoftheCTS-FPtothepowersupplyandtoeitherthefixednetworkortheGSMnetworkinterface.SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)11(GSM02.56version7.2.1Release1998)• EnrolmentoftheCTS-FP(CTS-FPenrolment).AstheCTS-FPshallnotbeGSMoperatorspecific,ithastobeenrolledwithoperationspecificdata,e.g.alistofallowedfrequencies(GenericFrequencyListGFL).• EnrolmentofoneorseveralCTS-MSswiththeCTS-FP(CTS-MSenrolment).Onceinitialised,CTSoperationshallnotrequireanyspecificactionoftheusertomaintaintheoperationaslongastheCTS-FPisnotde-activated(seeclause6).TohaveservicegrantedbytheCTS-FP,aCTS-MSshallattachattheCTS-FP.Inordertoattach,aCTS-MShastobeenrolledwiththeCTS-FP,theuserhastobringtheCTS-MSinrangeoftheCTS-FPandtheappropriateoperationmodehastobeselected(seesubclause4.2.5.1).4.2.3SubscriptionsTheCTS-FPownershallhaveavalidCTSsubscriptionfromaCTSoperator.ThissubscriptionismaterialisedbyanFP-SIM.ItgivestherighttotheCTS-FPownertoinitialisetheCTS-FPandenrollCTS-MSsunderconditionsdefinedbytheCTSoperator.InexchangeofasubscriptiontoaCTSoperator,theCTS-FPownerwillreceiveaCTS-GFLintheCTS-FP.TheuseroftheGSMCTSserviceshallhaveasubscriptionwithaGSMoperator,whichallowsCTSservice.ThisCTSauthorisationmaybegiventoalltheCTS-MSsofaPLMNormaybelinkedtoaspecificservicesubscriptiongivenbytheGSMoperator.BydefaulttheCTS-MSarenotallowedtodoCTSoperations.TheuseofaGSMsubscriptionfor'CTSonly'serviceisnotprecluded.CorrespondinginformationmaybestoredintheSIM.InordertobeabletousetheCTSserviceonthefixednetwork,asubscriptiontothefixednetworkisalsorequired.WhenconnectedtotheGSMnetwork,thefixednetworksubscriptionisreplacedbyaGSMsubscriptionandtheCTS-FPshallincludeaGSMSIMcardcorrespondingtothisGSMsubscription.Thefixednetwork,GSMandCTSsubscriptionsmaybeindependentofeachother.HoweveratCTS-FPenrolment(seesubclause5.1)theCTS-FPmayobtainoperationdataspecifictotheCTSoperator,theuseroftheCTSservicehassubscribedto,thustheCTS-FPoperationmaybetiedtoaspecificGSMoperator.TheCTS-FPisnormallynotsubscribedto,itistheusers'property.AftertheCTSservicesubscriptiontooneoperatoriscancelled,itshallbepossibletousethesameCTS-FPforaCTSservicesubscriptiontoanotheroperator.4.2.3.1CTS-roamingaspectsACTS-FPownermayonlyhaveoneCTSsubscriptiontoasingleCTSoperator.ThisoperatordefineswhichCTS-MSsareallowedtoenrollontoaparticularCTS-FP.SeveralcontrollevelsareofferedbytheCTS:• Uncontrolledroaming:allCTS-MSfromanyGSMoperatorareallowedtoenrolontheCTS-FPwithoutCTS-operatorcontrol• Noroaming:theCTS-operatorandtheGSMoperatorarethesameandonlytheCTS-MSsfromtheCTSoperatorareallowedtoattachontheCTS-FP• Controlroaming:Onacasebycasebasis,theCTS-operatorcontrolsCTS-MSenrolmentusingCTS-MSIMSI.Inanycases,theCTS-FPownerauthorisationismandatoryforCTS-MSenrolment.NOTE:CTS-roaminghasnoimpactonCTS-FPoperationalmodedefinedbytheCTS-operator(e.g.frequencymanagement).4.2.3.2WithdrawalofCTSsubscriptionWhenusedwithinalicensedband:-iftheCTSsubscriptioniswithdrawn,theuserloosestherighttouseaCTS-operator'sfrequencyspectrumforCTSusageandCTSoperationshallstop.AstheCTSserviceisnotobtaineddirectlyfromtheGSMnetworklikeotherGSMservices(e.g.SMS),meansofsubscriptioncontrolhavetobedefined.SIST EN 302 403 V7.2.1:2003



ETSIETSIEN302403V7.2.1(2000-08)12(GSM02.56version7.2.1Release1998)4.2.4GSMcoverageTheconceptshouldallowCTSoperationduringallGSMcoveragescenarios,e.g.thefollowing:• AreawithnoGSMcoverage.• AreawithGSMcoverageoftheHPLMNoperator.• AreawithnoHPLMNcoverage,butcoverageofotherPLMNoperator(s).Dependingontheenrolmentconceptbeingused(seesubclause5.1),alimitationmaybethattheMSneedtobeinHPLMN(oratleastPLMN)coverageonce,beforetheCTS-FPcanbecorrectlyinitialised(iftheGSMradiointerfaceisusedforenrolmentdatadownload).InthecaseofaCTS-FPconnectedtoaPLMN,aGSMcoverageisnecessaryforCTSoperations4.2.5Mobility4.2.5.1ModeselectionbetweenCTSandPLMNTheCTS-MSmayoperateinoneofsixdifferentoperationmodes.ItisnotrequiredthattheCTS-MSsupportallthemodes.Itshallbepossiblefortheusertoselectbetweenthesupportedmodesatanytime,exceptduringanactivecall:a)Manualmode:GSMonly,i.e.thenormalGSMoperation.b)Manualmode:CTSonly,i.e.callscanonlybeoriginatedorreceivedviatheCTS-FP.TheMSisnotattachedtotheGSMPLMN.c)AutomaticmodewithCTSpreferred:TheMSattachestoCTS,wheninrange,andthenautomaticallytriestoattachwithGSMPLMN,whenoutofCTSrange.AnMSattachedwithaGSMPLMNandcominginrangeoftheCTSshallnotattachtoCTSifaconnectionintheGSMPLMNisactive.InthatcasetheMSshallwaituntiltheconnectionisfinished.d)AutomaticmodewithGSMpreferred:theMSattachestoGSMPLMN,wheninrange,andthenautomaticallytriestoattachwithCTS,whenoutofGSMPLMNrange.AMSattachedwithCTSandcominginrangeofaGSMPLMNshallnotattachtotheGSMPLMN,ifaconnectionintheCTSisactive.InthatcasetheMSshallwaituntiltheconnectionisfinished.e)Parallelmode-singleactivemode:theMStriestoattachwithbothGSMPLMNand
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