1、Released: June I, 1994 GSM 02.24 Version: 4.3.0 Date: 15 April, 1994 Source: ETSI TC-SMG Reference: GSM 02.24 UDC: 621.396.21 Key words: European digital cellular telecommunications system, Global System for Mobile communications (GSMI European digital cellular telecommunications system (Phase 2); D
2、escription of Charge Advice Information (CAI) (GSM 02.24) ETS+ European Telecommunications Standards Institute ETSI Secretariat Postal address: 06921 Sophia Antipolis Cedex - FRANCE Office address: Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Tel.: + 33 92 94 42 O0 - Fax: + 33 93 65 47
3、16 European Telecommunications Standards Institute 1994. All rights reserved. No part may be reproduced except as authorised by written permission. The copyright and the foregoing restriction on reproduction extend to all media in which the information may be embodied. Page 2 GSM 02.24 version 4.3.0
4、 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Standards Approval Dept.“ at the address shown on the title page. . . . m 3
5、404583 OLL6728 331 m Page 3 GSM 02.24 version 4.3.0 Contents Foreword . 5 O . General . 7 0.2 Normative references 7 0.3 Definitions . 7 o . 1 Scope . 7 1 Not used . 8 2 Introduction . 8 3 Charge advice information 9 4 Functional operation in MS . 10 4.1 4.2 Handling of the CAI elements . 10 Handlin
6、g of call meters . 11 4.2.1 The Current Call Meter (CCM) . 11 4.2.2 The Accumulated Call Meter (ACM) 12 4.2.3 The ACM Maximum Value (ACMM) . 12 4.2.4 The Price per Unit and Currency Table (PUCT) . 12 4.3 Special processing 12 5.1 Outgoing calls . 13 5.2 Incoming calls 14 5 Functional operation in PL
7、MN . 13 - - - - m 3404583 OLL6729 278 m Page 5 GSM 02.24 version 4.3.0 Foreword This space is reserved for the ETS version of this document. Previous page is blank - - -. - - W 340q583 O116730 TT W Page 7 GSM 02.24 version 4.3.0 O. General 0.1 Scope The charging supplementary service are described i
8、n GSM 02.86 and the relevant charging principles are given in GSM 02.20. 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 MS subscriber. In the case of certain MS
9、 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 specification in order to avoid constraining the evolut
10、ion of the MS product in this area. This specification gives an overall view of how these supplementary service shall operate both in the PLMN and within the MS. Text given in this specification is required to define functionality and is not intended to constrain implementation. 0.2 Normative refere
11、nces This ETS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publication
12、s apply to this ETS only when incorporated in it by amendment or revision. For undated references, the latest editionof the publication referred to applies. 11 1 I21 I31 GSM O1 .O4 : “European digital cellular telecommunication system (Phase 2); Definitions, abbreviations and acronyms“. GSM 02.86 :
13、“European digital cellular telecommunication system (Phase 2); Advice of charge (AOC) supplementary services - Stage 1 “. GSM 1 1.1 1 : “European digital cellular telecommunication system (Phase 2); Specification of the Subscriber Identity Module-Mobile Equipment (SIM- ME) interface“. 0.3 Definition
14、s In addition to the following, abbreviations used in this specification are listed in GSM 01.04. Mark up (MU): An increase over the basic charge e.g. to provide extra revenue or to cover additional costs. Service Provider (SPI: The organisation through which the subscriber obtains GSM telecommunica
15、tion services. This may be the network operator or possibly a separate body. Home Units (HUI: 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
16、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. Price per unit and curre
17、ncy table (PUCT): Previous page is blank Page 8 GSM 02.24 version 4.3.0 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 doe
18、s 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
19、in terms of Home units. The ACM is stored in the SIM. ACM Maximum value (ACMM): The ACMM sets the upper limit for the ACM. The ACMM is stored in the SIM. The value of the ACMM can be set by the subscriber. Charging point (CHP): The time at which charging commences .e. at the point when the called pa
20、rty answers or the equivalent. End of call (CEND): The time at which the calling 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 H
21、ome Units. Segment: A charging element as defined by CCITT, in octets (up to 64). 1 Not used 2 Introduction The principle of this service is that the mobile station 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
22、 the MS to perform further processing on AOC is not precluded. If the subscriber wishes, the MS shall indicate the value of CCM, ACM, ACMM 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
23、clock to time the call from the charging point to the end of call .e. the chargeable duration (CDUR) is measured by the MS. In the case of multiple calls this applies separately for each call (see section 4.3 I). By using the calculations described in section 4, the MS shall be able to derive the nu
24、mber 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 MC and the network, eng. transmission of charging point and end of call signals. In derivin
25、g this specification 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. ii) iii
26、) iv) 3 e5 e6 e7 - - - - Page 9 GSM 02.24 version 4.3.0 m 3404583 Ollb732 862 m u/d Units per data interval O 819.1 o. 1 seg/d Segmentddata interval O 81 91 1 t/i Initial secs/t interval O 819.1 o. 1 It is assumed that the MS subscriber will NOT be charged for the forwarded leg if the dialled number
27、 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. For mobile terminated calls, any charge set for incoming calls is that based on the t
28、ariff 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. Charge rates for calls originating within a PLMN vary depending upon, for example
29、, location, destination, service, time of day, type of day and any mark ups. 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
30、type of call including supplementary service and data calls. Charge advice information 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. Element el - This element defines the number of uni
31、ts 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 - Page 10 GSM 02.24 version 4.3.0 This element defines the time interval for unitization, and is specified in seconds, to a b resolution as defined in the table
32、 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 - This element defines the number of units to be incremented on receipt of the
33、 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 tabl
34、e 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
35、 access to modems or PADS, (except Dedicated PADS) 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 describe
36、d by the.equation:- AOC = e3 * e4 + el *INT(CDUR/(e7,e2) + e5*1NT(SEG/e6) = scaling * constant + time related + data related where: AOC CDUR SEG INT(v1 * indicates multiply operator. e7,e2 is the Advice of Charge in home units. is the Chargeable DURation as measured by the MS. is the SEGment count a
37、s counted by the MS. is the function to take the INTeger value of v. indicate first e7 then e2 selected as described below. 4.1 Handling of the CAI elements For the detailed mechanisms, the conditions given under section 4.3. (Special Processing) must be observed. The following therefore describes t
38、he 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 M
39、eter (CCM, see below) on receipt of the CAI message. - _ m 3404583 O116734 635 m Page Il GSM 02.24 version 4.3.0 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
40、CDUR reaches e7 (see special processing for the case where e7 is equal to zero) .e. a full interval has been timed, then el*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
41、 it is updated via a new CAI message. 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 .e. a full interval has been timed, then el*e
42、3 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 segm
43、ent transferred. When SEG reaches e6 .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 NOTE 2 NOTE 3 NOTE 4 NOTE 5 Elements el,e7 and e2 have no effect on the initial charg
44、e or fixed charges applied .e. are independent of e4. It should be noted that el in conjunction with e2 increases charging range compared to a regime based on e2 only. (.e. el fixed at unity). This benefit is secondary to the support of call Charging for roamers, which is the main function of el. el
45、 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. .e. el can be increased instead of reducing e2, with some loss of accuracy of correlation with the actual bill. Element e5, for data us
46、age charging, is equivalent to el (time related charging) and provides similar benefits for the support of data usage charges for roamers and high cost data calls. Rules for handling of CAI elements in the case of multiple calls are given in section 4.3. I). 4.2 Handling of call meters Two meters ar
47、e defined. 4.2.1 The Current Call Meter (CCMI 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 itemis
48、ed 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 I - - - -_ _ = 3404583 OLL6735 571 W Page 12 * GSM 02.24 version 4.3.0 the initiation/accepta
49、nce attempt. This information is deleted when the MS is switched off or the SIM is removed. *i The CCM is essential for the correct functioning of AOC, see sections 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
