SIST EN 300 923 V7.0.1:2003

• Abstract:

  Upgrade o Release 1998

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 923 V7.0.1 (2000-01) - Digital cellular telecommunications system (Phase 2+) (GSM); Description of Charge Advice Information (CAI) (GSM 02.24 version 7.0.1 Release 1998)

Overview

SIST EN 300 923 V7.0.1:2003 is the Slovenian adoption of the European standard EN 300 923 (GSM 02.24 version 7.0.1, Release 1998), developed by ETSI. This standard outlines the Description of Charge Advice Information (CAI) for the Global System for Mobile Communications (GSM), Phase 2+. Charge Advice Information is essential in GSM networks for providing subscribers with real-time notifications about estimated call costs, enhancing transparency and control over expenditures.

Primarily intended for network operators, service providers, and mobile device manufacturers, the standard details how CAI works, how information is communicated between the Public Land Mobile Network (PLMN) and Mobile Station (MS), and how users are informed about their charges during roaming and regular usage scenarios.

Key Topics

The standard covers several important topics related to GSM charging functionality:

• Charge Advice Information (CAI)
  • Defines how CAI is conveyed from network to the subscriber’s mobile device via signaling messages.
  • Enables the MS to calculate the Advice of Charge (AoC), giving an estimate of costs.
• Call Meters in GSM Devices
  • Current Call Meter (CCM): Records the charge for the ongoing call, updated in real time.
  • Accumulated Call Meter (ACM): Tracks the sum of charges for all calls, useful for users to monitor ongoing costs.
  • ACM Maximum Value (ACMmax): User-configurable limit that restricts further chargeable activity upon reaching a preset value.
• Price per Unit and Currency Table (PUCT)
  • Allows users to view charges in a preferred currency, as set within the SIM.
• Charging Principles
  • Covers scenarios for both outgoing and incoming calls, including roaming conditions.
  • Details the signaling elements used in CAI to define charging intervals, unit conversions, and initial/fixed charges.
• Real-time Charging Indication
  • Users receive timely feedback on call costs, promoting cost awareness.
  • Supports both simple and complex usage, including multiple simultaneous calls and data segments.

Applications

This standard directly applies to several practical use cases in the telecommunications industry:

• Mobile Operators:
  Employ the CAI mechanisms to implement accurate charge notifications and improve customer trust, especially in roaming scenarios.
• Device Manufacturers:
  Ensure compatibility with GSM charge advice features, supporting SIM features for cost tracking and display.
• Service Providers:
  Facilitate billing transparency, enabling features like prepaid account monitoring, and supporting business models such as mobile payphones.
• Consumers:
  Empower users with visibility over real-time call costs, and the ability to set ACMmax for budget management.
• Billing & Roaming Optimization:
  Helps align actual usage with subscriber bills, reducing disputes and customer service costs.

Implementing the procedures and functionalities described in SIST EN 300 923 V7.0.1:2003 ensures that GSM networks remain compliant with international best practices for mobile communication charging information.

Related Standards

For comprehensive GSM mobile charging and supplementary services, consider the following standards:

• GSM 01.04: Digital cellular telecommunications system; Abbreviations and acronyms.
• GSM 02.86: Advice of Charge (AoC) Supplementary Services - Stage 1.
• GSM 11.11: Specification of the Subscriber Identity Module - Mobile Equipment (SIM-ME) interface.

These standards provide additional detail on terminology, service frameworks, and SIM functionalities, ensuring the complete and interoperable implementation of charging advice services across GSM networks.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Description of Charge Advice Information (CAI) (GSM 02.24 version 7.0.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 923 Version 7.0.1SIST EN 300 923 V7.0.1:2003en01-december-2003SIST EN 300 923 V7.0.1:2003SLOVENSKI
STANDARD
ETSIEN300923V7.0.1(2000-01)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);DescriptionofChargeAdviceInformation(CAI)(GSM02.24version7.0.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)2(GSM02.24version7.0.1Release1998)ReferenceREN/SMG-010224Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)3(GSM02.24version7.0.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.51.1References.51.2Definitionsandabbreviations.52Introduction.63ChargeAdviceInformation.74FunctionaloperationinMS.84.1HandlingoftheCAIelements.84.2Handlingofcallmeters.94.2.1TheCurrentCallMeter(CCM).94.2.2TheAccumulatedCallMeter(ACM).104.2.3TheACMMaximumValue(ACMmax).104.2.4ThePriceperUnitandCurrencyTable(PUCT).104.3Specialprocessing.105FunctionaloperationinPLMN.115.1Outgoingcalls.115.2Incomingcalls.11AnnexA(informative):Changehistory.13History.14SIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)4(GSM02.24version7.0.1Release1998)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).ThepresentdocumentdescribestheoverallviewofhowthesupplementaryserviceofChargeAdviceInformation(CAI)operateswithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenbere-submittedforformalapprovalproceduresbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7 GSM Phase 2+ Release 1998;xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)5(GSM02.24version7.0.1Release1998)1ScopeThechargingsupplementaryserviceisdescribedinGSM02.86[2]andtherelevantchargingprinciplesaregivenintherelevantGSMMoUAssociationdocuments.Theseservicesaredesignedtosupplytoamobileusersufficientinformationtoallowareal-timeestimatetobemadeofthebillwhichwilleventuallybeleviedinthehomePLMNontheMobileStation(MS)subscriber.InthecaseofcertainMSuses,forexampleamobilepayphone,thisestimatecouldbesubjecttofurtherprocessing(e.g.topresentthechargesincurrency,ratherthanunits,thismayincludeanadditionalmarkup).ThisadditionalprocessingisnotdescribedinthepresentdocumentinordertoavoidconstrainingtheevolutionoftheMSproductinthisarea.ThepresentdocumentgivesanoverallviewofhowthissupplementaryserviceshalloperatebothinthePLMNandwithintheMS.Textgiveninthepresentdocumentisrequiredtodefinefunctionalityandisnotintendedtoconstrainimplementation.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.•Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.•Foraspecificreference,subsequentrevisionsdonotapply.•Foranon-specificreference,thelatestversionapplies.•Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.•ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM02.86:"Digitalcellulartelecommunicationsystem(Phase2+);AdviceofCharge(AoC)SupplementaryServices-Stage1".[3]GSM11.11:"Digitalcellulartelecommunicationsystem(Phase2+);SpecificationoftheSubscriberIdentityModule-MobileEquipment(SIM-ME)interface".1.2DefinitionsandabbreviationsInadditiontothefollowing,abbreviationsusedinthepresentdocumentarelistedinGSM01.04[1].Markup(MU):Anincreaseoverthebasicchargee.g.toprovideextrarevenueortocoveradditionalcosts.ServiceProvider(SP):TheorganizationthroughwhichthesubscriberobtainsGSMtelecommunicationservices.Thismaybethenetworkoperatororpossiblyaseparatebody.HomeUnits(HU):ThepublishedbasictelecommunicationunitaspublishedbytheHPLMN.ThishasapublishedvalueexpressedinthecurrencyoftheHomecountry.SIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)6(GSM02.24version7.0.1Release1998)LocalPLMN(LPLMN):TheLPLMNistheHPLMNorVPLMNdependingonthelocationoftheMSatthetimeandisthePLMNwithwhichtheMSisinterworkingviatheradiointerface.LocalUnits(LU):ThepublishedbasictelecommunicationunitaspublishedbytheLPLMN.Thishasapublishedvalueexpressedinthecurrencyofthelocalcountry.PriceperUnitandCurrencyTable(PUCT):ThePUCTisthevalueoftheHomeunitinacurrencychosenbythesubscriber.ThePUCTisstoredintheSIM.ThevalueofthePUCTcanbesetbythesubscriberandmayexceedthevaluepublishedbytheHPLMN.ThePUCTvaluedoesnothaveanyimpactonthechargesraisedbytheHPLMN.CurrentCallMeter(CCM):TheaccumulatedchargeascomputedbytheMS,expressedintermsofHomeunits.AccumulatedCallMeter(ACM):TheaccumulatedchargeforboththecurrentcallandallprecedingcallsascomputedbytheMS,expressedintermsofHomeunits.TheACMisstoredintheSIM.ACMMaximumvalue(ACMmax):TheACMmaxsetstheupperlimitfortheACM.TheACMmaxisstoredintheSIM.ThevalueoftheACMmaxcanbesetbythesubscriber.Chargingpoint(CHP):Thetimeatwhichchargingcommencesi.e.atthepointwhenthecalledpartyanswersortheequivalent.Endofchargepoint(CEND):Thetimeatwhichthecalling,orcalled,partystopschargingbytheterminationofthecallorbyanequivalentprocedureinvokedbythenetworkorbyfailureoftheradiopath.AdviceofCharge(AOC):ThechargeascomputedbytheMS,expressedintermsofHomeUnits.Segment:AchargingelementasdefinedbyCCITT,inoctets(upto64).2IntroductionTheprincipleofthisserviceisthattheMSshallbecapableofindicatingthecostofacallinhomeunitsasabasicservice.ThisistheAdviceofCharge(AOC).TheabilityfortheMStoperformfurtherprocessingonAOCisnotprecluded.Ifthesubscriberwishes,theMSshallindicatethevalueofCCM,ACM,ACMmaxinthecurrencyshehasindicatedusingthePUCT.Atthechargingpoint,theMSisinformedofthechargingrate.TheMSshallthenuseitsindependentinternalclocktotimethecallfromthechargingpointtotheendofcalli.e.thechargeableduration(CDUR)ismeasuredbytheMS.Inthecaseofmultiplecallsthisappliesseparatelyforeachcall(seesubclause4.3l).ThetimetakenattemptingtoperformcallreestablishmentisnotincludedinCDUR(seesubclause4.3m).Byusingthecalculationsdescribedinclause4,theMSshallbeabletoderivethenumberofhomeunitsused.SIST EN 300 923 V7.0.1:2003

ETSIETSIEN300923V7.0.1(2000-01)7(GSM02.24version7.0.1Release1998)Duetotheindependenceofthecalculatedvalue,anexactone-to-onerelationwiththebillcannotbeguaranteed.ThisdiscrepancyisduetotheshortdelaysinsignallingbetweentheMSandthenetwork,e.g.transmissionofchargingpointandendofcallsignals.Inderivingthepresentdocumentthefollowingprinciplesareassumed:i)Formobileoriginatedcalls,themobileuserpaysfortheconnectiontothediallednumber,asperthepublishedtariffoftheLocalPLMN,plusamark-updefinedbytheHPLMNtocoveradditionaladministrationcosts,whenroaming.ItisassumedthattheMSsubscriberwillnotbechargedfortheforwardedlegifthediallednumberhassetcallforwarding.Ifadditionalchargingisrequiredforthisforwardedleg,thenitisassumedthatsuchchargingwillbeappliedonlytothecalledparty.Thisfollowscurrenttelecommunicationspractice.ii)Formobileterminatedcalls,anychargesetforincomingcallsisthatbasedonthetariffaspublishedbytheHPLMN.Thetariffaspublishedfortheroamingextensionchargesisassumedtobetimeanddateinvariant.Fortheavoidanceofdoubt,thisassumptiondoesnotprecluderoutinetariffchanges.iii)ChargeratesforcallsoriginatingwithinaPLMNvarydependingupon,forexample,location,destination,service,timeofday,typeofdayandanymarkups.iv)TheunitsindicatedintheadviceofchargearealwaysgivenintermsofHomeunits,thevalueofwhichisdefinedandpublishedbytheHPLMN,regardlessofthePLMNinwhichtheywereincurredorthecalldirectionorthetypeofcallincludingsupplementaryserviceanddatacalls.3ChargeAdviceInformationTheMSissuppliedwiththenecessaryChargeAdviceInformation(CAI)atthechargingpointonapercallbasis,inasignallingmessageovertheradiointerface.TheMSusestheCAIelementstocomputetheAOCvaluefortherelevantcall.ThusthesignallingCAInotonlyprovidescharginginformation,butindicatesthechargingpointandhenceinitiatesthetimingofthechargeableduration.TheinformationsenttotheMSfromtheMSCconsistsofsevenelementsasfo
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