ETSI TS 122 024 V8.0.0 (2009-01) Technical Specification Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Description of Charge Advice Information (CAI) (3GPP TS 22.024 version 8.0.0 Release 8) 3GPP TS 22.024 version 8.0.0 Release 8 1 ETSI TS 122 024 V8.0.0 (2009-01) Reference RTS/TSGS-0122024v800 Keywords GSM, LTE, UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). 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ETSI 3GPP TS 22.024 version 8.0.0 Release 8 3 ETSI TS 122 024 V8.0.0 (2009-01) Contents Intellectual Property Rights ................................................................................................................................ 2 Foreword ............................................................................................................................................................. 2 Foreword ............................................................................................................................................................. 4 1 Scope ........................................................................................................................................................ 5 1.1 References .......................................................................................................................................................... 5 1.2 Definitions and abbreviations ............................................................................................................................. 5 2 Introduction .............................................................................................................................................. 6 3 Charge Advice Information ...................................................................................................................... 7 4 Functional operation in MS ...................................................................................................................... 8 4.1 Handling of the CAI elements ............................................................................................................................ 8 4.2 Handling of call meters ...................................................................................................................................... 9 4.2.1 The Current Call Meter (CCM) .................................................................................................................... 9 4.2.2 The Accumulated Call Meter (ACM) ........................................................................................................... 9 4.2.3 The ACM Maximum Value (ACMmax) .................................................................................................... 10 4.2.4 The Price per Unit and Currency Table (PUCT) ........................................................................................ 10 4.3 Special processing ............................................................................................................................................ 10 4.4 Interactions with SCUDIF supplementary service ........................................................................................... 11 5 Functional operation in PLMN ............................................................................................................... 11 5.1 Outgoing calls .................................................................................................................................................. 11 5.2 Incoming calls .................................................................................................................................................. 11 Annex A (informative): Change history ............................................................................................... 13 History .............................................................................................................................................................. 14 ETSI 3GPP TS 22.024 version 8.0.0 Release 8 4 ETSI TS 122 024 V8.0.0 (2009-01) Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI 3GPP TS 22.024 version 8.0.0 Release 8 5 ETSI TS 122 024 V8.0.0 (2009-01) 1 Scope The charging supplementary service is described in TS 22.086 [2]. These services are designed to supply to a mobile user sufficient information to allow a real-time estimate to be made of the bill which will eventually be levied in the home PLMN on the 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 processing is not described in this document in order to avoid constraining the evolution of the MS product in this area. This document gives an overall view of how this supplementary service shall operate both in the PLMN and within the MS. Text given in this document is required to define functionality and is not intended to constrain implementation. 1.1 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications". [2] 3GPP TS 22.086: "Advice of Charge (AoC) Supplementary Services - Stage 1". [3] 3GPP TS 23.172: "Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification; Stage 2". 1.2 Definitions and abbreviations In addition to the following, abbreviations used in the present document are listed in TS 21.905 [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 PLMN services. This may be the network operator or possibly a separate body. Home Units (HU): The published basic telecommunication unit as published by the HPLMN. This has a published value expressed in 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 with which the MS is interworking via the radio interface. Local Units (LU): The published basic telecommunication unit as published by the LPLMN. This has a published value expressed in the currency of the local country. ETSI 3GPP TS 22.024 version 8.0.0 Release 8 6 ETSI TS 122 024 V8.0.0 (2009-01) 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. The PUCT 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 in terms of Home units. The ACM is stored in the SIM/USIM. ACM Maximum value (ACMmax): The ACMmax sets the upper limit for the ACM. The ACMmax is stored in the SIM/USIM. The value of the ACMmax can 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 equivalent procedure 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 ITU-T, in octets (up to 64). 2 Introduction The principle of this service is that the MS shall be capable of indicating the cost of a call in home units as a basic service. 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 shall indicate 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. the chargeable 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 subclause 4.3 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. This discrepancy is due to the short delays in signalling between the MS and the network, e.g. transmission of charging point and end of call signals. In deriving the present document the following principles are assumed: i) For mobile originated calls, the mobile user pays for the connection to the dialled number, as per the published tariff of the Local PLMN, plus a mark-up defined by the HPLMN to cover additional administration costs, when roaming. ETSI 3GPP TS 22.024 version 8.0.0 Release 8 7 ETSI TS 122 024 V8.0.0 (2009-01) It is assumed that the MS subscriber will not be charged for the forwarded leg if the dialled number has set call forwarding. If additional charging is required for this forwarded leg, then it is assumed that such charging will be applied 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 the HPLMN. The tariff as published for the roaming extension charges is assumed to be time and date invariant. For the avoidance 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 defined and published by the HPLMN, regardless of the PLMN in which they were incurred or the call direction or the type of call including supplementary service and data calls. 3 Charge Advice Information The MS is supplied with the necessary Charge Advice Information (CAI) at the charging point on a per call basis, in a signalling 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 only provides 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 elements Element Dimensions Description MIN MAX RES e1 u/i Units per interval 0 819.1 0.1 e2 t/i Seconds/time interval 0 819.1 0.1 e3 - Scaling Factor 0 81.91 0.01 e4 u Unit increment 0 819.1 0.1 e5 u/d Units per data interval 0 819.1 0.1 e6 seg/d Segments/data interval 0 8191 1 e7 t/i Initial secs/t interval 0 819.1 0.1 where: 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 from the initial CAI message of a call, they shall be treated as zero. Element e1 - This element defines the number of units incremented per interval. It is set in terms of LPLMN units/interval to a resolution as defined in the table above under RES. Element e2 - This element defines the time interval for unitization, and is specified in seconds, to a resolution as defined in the table above under RES. Element e3 - This element defines the scaling factor to convert from LPLMN units to HPLMN units. It is a dimensionless multiplier given to a resolution as defined in the table above under RES. Element e4 - ETSI 3GPP TS 22.024 version 8.0.0 Release 8 8 ETSI TS 122 024 V8.0.0 (2009-01) This element defines the number of units to be incremented on receipt of the message containing the CAI elements. It is specified in units of the LPLMN to a resolution as defined in the table above under RES. Element e5 - This element defines the number of units incremented per data interval. It is set in terms of LPLMN units/interval, to a resolution as defined in the table above under RES. Element e6 - This element defines the data usage interval for unitization, and is specified in segments (SEG), to a resolution as defined in the table above under RES., for Dedicated Access to the PSPDN (whether directly or via Dedicated PAD). It does not apply to circuit switched access to modems or PADs, (except Dedicated PAD's) or MS to MS calls. Element e7 - This element defines the initial time interval for unitization, and is specified in seconds, to a resolution as defined in the table above under RES. 4 Functional operation in MS Simple operation in the MS is described by the equation:- AoC = e3 * { e4 + e1*INT(CDUR/(e7,e2)) + e5*INT(SEG/e6) } = scaling * { constant + time related + data related } where: AoC is the Advice of Charge in home units. CDUR is the Chargeable DURation as measured by the MS. SEG is the SEGment count as counted by the MS. INT(v)is the function to take the INTeger value of v. * indicates multiply operator. e7,e2 indicate first e7 then e2 selected as described below. 4.1 Handling of the CAI elements For the detailed mechanisms, the conditions given under subclause 4.3 (Special Processing) must be observed. The following therefore describes the process for a simple single call scenario, for either an incoming or outgoing call for the MS in any PLMN, including HPLMN:- On receipt of the CAI message, charging computation commences. INITIAL/FIXED CHARGE: Element e4*e3 defines the number of HPLMN units to be incremented in the Current Call Meter (CCM, see below) on receipt of the CAI message. INITIAL TIME RELATED CHARGE: On first receipt of the CAI message, timing commences immediately and MS timer CDUR is incremented, from zero, with a precision of at least 0.1 seconds. When CDUR reaches e7 (see special processing for the case where e7 is equal to zero) i.e. a full interval has been timed, then e1*e3 HPLMN units are added to the CCM. CDUR is then reset to zero to allow timing of the next interval to commence based on CAI element e2. Element e7 is not used further, unless it is updated via a new CAI message. ETSI 3GPP TS 22.024 version 8.0.0 Release 8 9 ETSI TS 122 024 V8.0.0 (2009-01) TIME RELATED CHARGE: On expiry of the interval defined by e7; e2 is applied and timing re-commences immediately. MS timer CDUR is incremented, from zero, with a precision of at least 0.1 seconds. When CDUR reaches e2 i.e. a full interval has been timed, then e1*e3 HPLMN units are added to the CCM. CDUR is then reset to zero to allow timing of the next interval to commence, based on e2. DATA RELATED CHARGE: On first receipt of non-zero element e6, data segment counting commences immediately and MS counter SEG is incremented, from zero, by unity for each segment transferred. When SEG reaches e6 i.e. a full data interval has been counted, then e5*e3 HPLMN units are added to the CCM. SEG is then reset to zero to allow counting of the next data interval to commence. NOTE 1: Elements e1, e7 and e2 have no effect on the initial charge or fixed charges applied i.e. are independent of e4. NOTE 2: It should be noted that e1 in conjunction with e2 increases charging range compared to a regime based on e2 only. (i.e. e1 fixed at unity). This benefit is secondary to the support of call charging for roamers, which is the main function of e1. NOTE 3: e1 improves the precision for high cost calls, where the interval, as defined by e2, may need to be excessively small, e.g. long haul international calls or INMARSAT. i.e. e1 can be increased instead of reducing e2, with some loss of accuracy of correlation with the actual bill. NOTE 4: Element e5, for data usage charging, is equivalent to e1 (time related charging) and provides similar benefits for the support of data usage charges for roamers and high cost data calls. NOTE 5: Rules for handling of CAI elements in the case of multiple calls are given in subclause 4.3 l. 4.2 Handling of call meters Two meters are defined. 4.2.1 The Current Call Meter (CCM) This is required to accumulate the charging units generated by the current call and is capable of advising: a) The current charge due for the call(s) in progress. b) At the end of the call(s), the charge equivalent to the current call record in an itemized bill. The CCM shall hold the value of the last call AOC, until the initiation of an outgoing call or acceptance of an incoming call, at which point it shall be reset to zero, regardless of the success of the initiation/acceptance attempt. This information is deleted when the MS is switched off or the SIM/USIM is removed. The CCM is essential for the correct functioning of AOC, see subclauses 4.1 and 4.3, and is a component of the Mobile Equipment. The charging computation shall cease immediately on termination of a call, as indicated by the user or the network, or on failure of the call. For multiple calls, CCM will advise the total charge of all the calls made and/or received during occupation of a traffic channel. 4.2.2 The Accumulated Call Meter (ACM) The Accumulated Call Meter accumulates the total units for both the current call and all preceding calls. The ACM is a function contained within the SIM/USIM. It is optional, but is essential for certain applications. For security reasons, the SIM/USIM only allows the value of the ACM to be incremented, not decremented. Resetting of the ACM shall only be possible after presentation of PIN2. If the ACMmax (see subclause 4.2.3) is valid, and the ACM becomes equal to or exceeds the value of the ACMmax, then all calls in progress, chargeable to the user (i.e. those calls that have a non-zero AoC associated with them), shall ETSI