SIST EN 300 923 V6.0.1:2003

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 6.0.1 Release 1997)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 6.0.1SIST EN 300 923 V6.0.1:2003en01-december-2003SIST EN 300 923 V6.0.1:2003SLOVENSKI
STANDARD



SIST EN 300 923 V6.0.1:2003



EN 300 923 V6.0.1 (1999-05)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);Description of Charge Advice Information (CAI)(GSM 02.24 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)2GSM 02.24 version 6.0.1 Release 1997ReferenceDEN/SMG-010224Q6 (8jo0300o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frIndividual copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999.All rights reserved.SIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)3GSM 02.24 version 6.0.1 Release 1997ContentsIntellectual Property Rights.4Foreword.41Scope.51.1Normative references.51.2Definitions and abbreviations.52Introduction.63Charge Advice Information.74Functional operation in MS.84.1Handling of the CAI elements.84.2Handling of call meters.94.2.1The Current Call Meter (CCM).94.2.2The Accumulated Call Meter (ACM).94.2.3The ACM Maximum Value (ACMmax).104.2.4The Price per Unit and Currency Table (PUCT).104.3Special processing.105Functional operation in PLMN.115.1Outgoing calls.115.2Incoming calls.11Annex A (informative):Change history.13History.14SIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)4GSM 02.24 version 6.0.1 Release 1997Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Special Mobile Group (SMG) of theEuropean Telecommunications Standards Institute (ETSI).This EN describes the overall view of how the supplementary service of Charge Advice Information (CAI) operateswithin the digital cellular telecommunications system.The contents of this standard may be subject to continuing work within SMG and may change following formal SMGapproval. Should SMG modify the contents of this standard it will then be re-submitted for formal approval proceduresby ETSI with an identifying change of release date and an increase in version number as follows:Version 6.x.ywhere:6GSM Phase 2+ Release 1997xthe second digit is incremented for changes of substance, i.e. technical enhancements, corrections, updates,etc.;ythe third digit is incremented when editorial only changes have been incorporated in the specification.Proposed national transposition datesDate of adoption of this EN:28 May 1999Date of latest announcement of this EN (doa):31 August 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):29 February 2000Date of withdrawal of any conflicting National Standard (dow):29 February 2000SIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)5GSM 02.24 version 6.0.1 Release 19971ScopeThe charging supplementary service is described in GSM 02.86 [2] and the relevant charging principles are given in therelevant GSM MoU Association documents. These services are designed to supply to a mobile user sufficientinformation to allow a real-time estimate to be made of the bill which will eventually be levied in the home PLMN onthe Mobile Station (MS) subscriber.In the case of certain MS uses, for example a mobile payphone, this estimate could be subject to further processing (e.g.to present the charges in currency, rather than units, this may include an additional mark up). This additional processingis not described in this EN in order to avoid constraining the evolution of the MS product in this area.This EN gives an overall view of how this supplementary service shall operate both in the PLMN and within the MS.Text given in this EN is required to define functionality and is not intended to constrain implementation.1.1Normative referencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.-References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.-For a specific reference, subsequent revisions do not apply.-For a non-specific reference, the latest version applies.-A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations andacronyms".[2]GSM 02.86: "Digital cellular telecommunication system (Phase 2+); Advice of Charge (AoC)Supplementary Services - Stage 1".[3]GSM 11.11: "Digital cellular telecommunication system (Phase 2+); Specification of theSubscriber Identity Module-Mobile Equipment (SIM-ME) interface".1.2Definitions and abbreviationsIn addition to the following, abbreviations used in this ETS are listed in GSM 01.04 [1].Mark up (MU):An increase over the basic charge e.g. to provide extra revenue or to cover additional costs.Service Provider (SP):The organization through which the subscriber obtains GSM telecommunication services. This may be thenetwork operator or possibly a separate body.Home Units (HU):The published basic telecommunication unit as published by the HPLMN. This has a published value expressedin the currency of the Home country.Local PLMN (LPLMN):The LPLMN is the HPLMN or VPLMN depending on the location of the MS at the time and is the PLMN withwhich the MS is interworking via the radio interface.Local Units (LU):SIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)6GSM 02.24 version 6.0.1 Release 1997The published basic telecommunication unit as published by the LPLMN. This has a published value expressedin the currency of the local country.Price per Unit and Currency Table (PUCT):The PUCT is the value of the Home unit in a currency chosen by the subscriber. The PUCT is stored in the SIM.The value of the PUCT can be set by the subscriber and may exceed the value published by the HPLMN. ThePUCT value does not have any impact on the charges raised by the HPLMN.Current Call Meter (CCM):The accumulated charge as computed by the MS, expressed in terms of Home units.Accumulated Call Meter (ACM):The accumulated charge for both the current call and all preceding calls as computed by the MS, expressed interms of Home units. The ACM is stored in the SIM.ACM Maximum value (ACMmax):The ACMmax sets the upper limit for the ACM. The ACMmax is stored in the SIM. The value of the ACMmaxcan be set by the subscriber.Charging point (CHP):The time at which charging commences i.e. at the point when the called party answers or the equivalent.End of charge point (CEND):The time at which the calling, or called, party stops charging by the termination of the call or by an equivalentprocedure invoked by the network or by failure of the radio path.Advice of Charge (AOC):The charge as computed by the MS, expressed in terms of Home Units.Segment:A charging element as defined by CCITT, in octets (up to 64).2IntroductionThe principle of this service is that the MS shall be capable of indicating the cost of a call in home units as a basicservice. This is the Advice of Charge (AOC).The ability for the MS to perform further processing on AOC is not precluded. If the subscriber wishes, the MS shallindicate the value of CCM, ACM, ACMmax in the currency she has indicated using the PUCT.At the charging point, the MS is informed of the charging rate.The MS shall then use its independent internal clock to time the call from the charging point to the end of call i.e. thechargeable duration (CDUR) is measured by the MS. In the case of multiple calls this applies separately for each call(see subclause 4.3 l). The time taken attempting to perform call reestablishment is not included in CDUR (see subclause4.3 m).By using the calculations described in clause 4, the MS shall be able to derive the number of home units used.Due to the independence of the calculated value, an exact one-to-one relation with the bill cannot be guaranteed. Thisdiscrepancy is due to the short delays in signalling between the MS and the network, e.g. transmission of charging pointand end of call signals.In deriving this ETS the following principles are assumed:SIST EN 300 923 V6.0.1:2003



ETSIEN 300 923 V6.0.1 (1999-05)7GSM 02.24 version 6.0.1 Release 1997i)For mobile originated calls, the mobile user pays for the connection to the dialled number, as per the publishedtariff of the Local PLMN, plus a mark-up defined by the HPLMN to cover additional administration costs, whenroaming.It is assumed that the MS subscriber will not be charged for the forwarded leg if the dialled number has set callforwarding. If additional charging is required for this forwarded leg, then it is assumed that such charging will beapplied only to the called party. This follows current telecommunications practice.ii)For mobile terminated calls, any charge set for incoming calls is that based on the tariff as published by theHPLMN.The tariff as published for the roaming extension charges is assumed to be time and date invariant. For theavoidance of doubt, this assumption does not preclude routine tariff changes.iii)Charge rates for calls originating within a PLMN vary depending upon, for example, location, destination,service, time of day, type of day and any mark ups.iv)The units indicated in the advice of charge are always given in terms of Home units, the value of which is definedand published by the HPLMN, regardless of the PLMN in which they were incurred or the call direction or thetype of call including supplementary service and data calls.3Charge Advice InformationThe MS is supplied with the necessary Charge Advice Information (CAI) at the charging point on a per call basis, in asignalling message over the radio interface.The MS uses the CAI elements to compute the AOC value for the relevant call. Thus the signalling CAI not onlyprovides charging information, but indicates the charging point and hence initiates the timing of the chargeable duration.The information sent to the MS from the MSC consists of seven elements as follows:Table 1: Information elementsElementDimensionsDescriptionMINMAXRESe1u/iUnits per interval0819.10.1e2t/iSeconds/time interval0819.10.1e3-Scaling Factor081.910.01e4uUnit increment0819.10.1e5u/dUnits per data interval0819.10.1e6seg/dSegments/data interval081911e7t/iInitial secs/t interval0819.10.1where:u = units; t = time; i = interval; seg = segments; d = data interval.The CAI Message need only contain those elements required for the particular situation. If elements are missing fromthe initial CAI message of a call, they shall be treated as zero.Element e1 -This element defines the number of units incremented per interva
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