1 Scope
22.0243GPPDescription of Charge Advice Information (CAI)Release 17TS
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.
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).