Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

A4C architecture

Metering to Accounting Adaptation: USTUTT developed an interface, which enables an inter-working between the enhanced, IPv6-capable RTFM-based meter to the Diameter Attendant for the final charging purpose. This includes a metering session concept, which has been implemented based on the used meter. Finally, extensive tests have been undertaken proving the overall concept for the message flow from the Meter to the charging database.

Charging: The charging process as developed by ETHZ calculates the price for a given service consumption based on accounting data and the SLA with all key tariff definitions. Within Moby Dick, charging supports the post paid business case and it is session-based. Within each session a user can employ services with different QoS and DSCPs and is able to roam in various domains. The tariff can be based on QoS, volume, session duration, and the domain where the service was consumed. The charging component features a convenient web interface - one for the operators and one for each customer. Users are able to login and view their accumulated charges after the provider has performed the charging process for a pre-defined period, such as a day, a month, or a week. The charges are presented in an aggregated and session-based manner, where all other details are hidden. Upon request, customers can view all accounted for charging details of each session, e.g., the consumed volume or the delivered QoS. The web interface for operators offers a login for several administration services, which customers cannot access. These include amongst others the start of the charging process for customers and sessions as well as the view of detailed customer information and their tariff definitions. Further research on prepaid and content-based charging will be addressed in the Daidalos project.

Auditing: Within Moby Dick the concept of SLA (Service Level Agreement) Compliance Auditing has been developed by ETHZ. This concept goes beyond the proposed extension of the AAAC's server tasks of simply logging capabilities. It allows a provider to determine whether the agreed service level guarantees are being held or violated. This approach and task will have a positive impact in the future of managing SLAs among providers as well as between providers and customers. The service level guarantees of interest, which have been defined and implemented within Moby Dick, include "Entity Availability Guarantee", "Guarantee of Successful Registration", and "Service Request". In order to transfer the audit trails generated by different and remote loggers to a centralised auditing instance, mainly a provider's or a third party's location, a logging framework has been implemented by ETHZ. Further research on SLA Compliance Auditing will be further carried out by ETHZ and partners within the Daidalos Project.

Profile Decoupling of an User from the Device: Moby Dick followed the key concept of user mobility. This means in contrary to the widely deployed terminal mobility a user and the users privileges and rights, which are generally reflected in a contract between user and operator, are not directly bound to a device or a SIM card inside a device as known in the 2G area. In Moby Dick any user can use any device and via a centralised profile management each user gets his individual access rights. This rights are described in the user profile and are communicated to the appropriate policy points which need the information for the service provisioning. Such a Profile concept has been designed and implemented.

The AAA/Diameter framework of Moby Dick then transfers required elements of this profile to the appropriate network nodes. This implies the exchange of information also between administrative domains. Conceptually the user rights could change from administrative domain to administrative domain, however the current implementation does assume that the profile description is valid for all administrative domains involved.

DIAMETER Open Source Implementation: The upcoming standard DIAMETER has been used for the support of AAAC functionality in this project. The use of DIAMETER in the project consolidates DIAMETER's position as the candidate for a future standard. Further, DIAMETER application for Mobile IPv6 was developed. This will be used as basis for further contributions to IETF drafts and RFC.

A fully functional DAIMETER based AAA infrastructure was designed and implemented in this project. The implementation is called DISC (DIAMETER Server Client).

The following parts of the DIAMETER implementation will be released as open source:
- Server functionality including accounting,
- Diameter base protocol,
- Diameter application for MIPv6.

More information on the Moby Dick project can be found at:

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