Question 19/III - General tariff principles for mobile telecommunications services (continuation of Question 20/III studied in 1985-1988) (To be studied in liaison with Study Group I and II.) Mobile telecommunications comprise three distinct services with a common need to be connected with the international network and to interconnect with other mobile service networks, but each with its own particular operational needs and problems. For these reasons, the following Question is broken down into three separate sections: a) land mobile service; b) maritime mobile and maritime mobile-satellite services, and c) aeronautical mobile service. a) Land mobile service Considering (a) that a first Recommendation has been developed to cover charging and accounting principles for the initial offering of an international telephone service, What new Recommendations or amendments to existing Recommendations are required to provide for: - other telecommunications services, - subscriber services, - charging data collection, -charging and accounting issues arising from the work of other CCITT and CCIR Study Groups, for example, the impact of the ISDN, - interconnection with other mobile service networks? b) Maritime mobile and maritime mobile-satellite services Considering (a) that the maritime mobile and, more particularly, the maritime mobile-satellite services are continuing to develop new services and facilities; (b) that the connection of these new developments to international telecommunication networks and to other mobile service networks will require the application of new charging and accounting principles; (c) that there is a continuing urgent need to further refine accounting and settlement procedures and to resolve issues relating to the currency of payment and currency conversion, What new Recommendations or amendments to existing Recommendations are required to meet the changing operational needs of the maritime mobile and maritime mobile-satellite services, to further refine accounting and settlement processes and to provide for the interconnection of these services with other mobile service networks? c) Aeronautical mobile service Considering (a) that during the 1989-1992 study period, many administrations* will be introducing public aeronautical mobile services; (b) that there are no existing Recommendations addressing charging and accounting for such services, What new principles need to be established to cover charging, accounting and settlement aspects relating to the three types of service: - HF radio, - UHF satellite, - UHF/VHF direct air/ground, for telephone and data, including telex, services in the air-to-ground direction and including interconnection with other mobile service networks? Study of the telephone service should take priority. A number of scenarios have already been identified by Study Group III to assist with this study. ANNEX (to Question 19/III) 1. Basis for the further study of charging and accounting principles for the aeronautical mobile service 1.1 The study of the aeronautical mobile service Question should take into account the possible tariff scenarios already identified for the aeronautical telephone service as listed below, and should expand/add to these as appropriate: 1.2 Charging: -aeronautical link, including ground station component; -terrestrial public network link (national/international); -any other additional charges, e.g. aeronautical mobile station charge. 1.3 Possible methods of payment: -by passengers - commercial credit card, - administration* credit cards; -by aircraft operators (e.g. corporate aircraft) - direct billing. 1.4 International accounting and settlements: -international terrestrial link traffic to be included in regular international accounts; -any additional settlement requirements and procedures to be identified. 2. Minimum requirements for charging data collection in PLMNs for roaming mobile stations 2.1 Introduction Information to be collected for charging purposes in an MSC for calls from (and to) an MS roaming in a foreign PLMN are listed below. Experience from operating the NMT-system has shown that possibility to handle customer complaints regarding charging of calls requires a minimum amount of data. The list presented below is prepared as a basis for further work on Recommendations in this field in the CCITT. 2.2 Charging data 2.2.1 Calling party identification (A-party): - ISDN-number; - IMSI; - MSEI; A-number indicators showing: - own mobile station; - visiting mobile station; - visiting mobile station with temporary subscription. A-party category information related to charging. 2.2.2 Called party identification (B-party) Cf. 2.2.1 (B-party category is the information received as end-of- selection signalling information). 2.2.3 Charged party information: - charging of the A-subscriber; IMSI - charging of the B-subscriber; IMSI 2.2.4 Date and times for: - radio channel seizure; - start of charging; - call release and/or chargeable duration; - handovers (Note). Note - The requirement to register the times for handovers is for further study (e.g. if frequency hopping is used in a system, this may complicate how to define the times to be registered in cases where handover in one cell may be used as well). 2.2.5 Type of channel or facility used: - full rate channel; - half rate channel; - user to user message [FFS] 2.2.6 Base stations/cells and channels used Information on base stations/cells used during a call (see also the note of 2.2.4). 2.2.7 Call release information: - normal A-party clearing before start of charging; - normal B-party clearing before start of charging; - normal A-party clearing after start of charging; - normal B-party clearing after start of charging; - base station initiated call release; - MSC initiated call release. 2.2.8 Exchange data: - identity of MSC; - incoming route (Note); - outgoing route (Note). Note - Several routes may be registered for one call in case of handover. Cf. the note of 2.2.4. 2.2.9 Subscriber services information: - activation/deactivation/interrogation; - services used during the call (e.g. call forwarding); - three party call indicator (including call waiting). 2.2.10 Charging information sent to MS: -information on the charging information sent e.g. to a coin box MS. 2.2.11 Tariff information: - tariff information and tariff switching indicator. 2.2.12 Location area: - location area where the MS was located at call set-up. 2.2.13 Fault type indication The registration of charging data should include a possibility to indicate that a fault situation occurred during a call which may reduce the reliability of the recording of charging data.