Diese Präsentation wurde erfolgreich gemeldet.
Wir verwenden Ihre LinkedIn Profilangaben und Informationen zu Ihren Aktivitäten, um Anzeigen zu personalisieren und Ihnen relevantere Inhalte anzuzeigen. Sie können Ihre Anzeigeneinstellungen jederzeit ändern.


812 Aufrufe

Veröffentlicht am

Veröffentlicht in: Technologie, Business
  • Als Erste(r) kommentieren

  • Gehören Sie zu den Ersten, denen das gefällt!


  1. 1. Budapest, August 31, 2012 EUNICE 2012 The Design of a Single Funding Point Charging Architecture (SFP-CA) Christos Tsiaras, Martin Waldburger, Guilherme Sperb Machado, Andrei Vancea, Burkhard Stiller {tsiaras,waldburger,machado,vancea,stiller}@ifi.uzh.ch Department of Informatics IFI, Communication Systems Group CSG, University of Zürich UZH Motivation Requirements Components Architecture© 2012 UZH, CSG@IFI 1
  2. 2. Motivation Institution & federation expenses decrease – Cautious user resources requests – Unnecessary infrastructure replication avoidance User- instead of service-dependent funding accounts – A missing feature from Single Sign-on (SSO) systems – Not the case in the majority of federations today Inter-domain charging capability – Make sense for costly services • NOT for eduroam / YES for printing, Short Message Service (SMS), VoIP – Today this is a privilege only for Mobile Network Operators (MNOs) and banks Real-time service access decision making functionality – Today is mainly offered only by MNOs A Single Funding Point Charging Architecture (SFP-CA) as an add-on for SSO systems in federated environments is essential© 2012 UZH, CSG@IFI 2
  3. 3. Use case: SMS service @ ETHZ SMS offered by the Eidgenössische Technische Hochschule Zürich (ETHZ) – SMS gateway – Agreement with an operator • The more SMS are sent the better the price per SMS is Assume that the University of Zurich (UZH) is willing to offer the same service – A second SMS gateway is needed • Infrastructure cost (purchase, setup, maintain) – A separate agreement with an operator is needed • Best case: The same price will be achieved Low SMS service load @ ETHZ – The existing infrastructure could serve all federation members – Better agreement with the SMS operator could be achieved!© 2012 UZH, CSG@IFI 3
  4. 4. SFP-CA Requirements user organization Virtual Virtual Funds Funds Account Account Interruption Service Trigger SMS: 10 BC Service Service Min: 0 BC Tariff Usage . . Map Constraints and . Limits© 2012 UZH, CSG@IFI 4
  5. 5. Virtual Funds Accounts (VFAs)  uVFA – One per user – Credits used to pay the requested resources – In postpaid solutions negative values are allowed – Created by users IdP  oVFA – Each organization has one oVFA for every other organization in the federation x oVFA(B) – If a user from organization A use ↑↓ resources at B then oVFA(A) ↓ and oVFA(B) ↑ oVFA(A) 0 oVFA(B) • If a payment has been done then ↓↑ oVFA(A) = oVFA(B) = 0 oVFA(A) -x • If oVFA(A) + oVFA(B) ≠ 0 then Charging Data Record (CDR) transfer error occurred© 2012 UZH, CSG@IFI 5
  6. 6. SFP-CA Components Organization  Service Provider Manager (SPM) – Service Providers (SPs) and users Service Provider Manager location-independent charging Charging Rate Manager SMS: 10 BC Min: 0 BC . .  Charging Rate Manager (CRM) – Support of event- and session- . Service Provider Identity Provider based services User  Account Balance Manager (ABM) Account – Support of prepaid and postpaid Balance Manager payment method  Charging Manager (CM) – Support of multiple organizations, Charging which belong on the same Manager federation Authentication and Authorization Infrastructure (AAI) / Single Sign-On (SSO) System© 2012 UZH, CSG@IFI 6
  7. 7. Charging scenarios that can be handled by the SFP-CA The service is provided to the user by... his home organization a foreign organization which is charging... which is charging... an users home the user using a... ins dt titu hen organization, using a... tio use n w r s ill c ho ha me offline charging online charging rg e offline charging ... method method method - VoIP - VoIP - VoIP - Printing - Printing - SMS© 2012 UZH, CSG@IFI 7
  8. 8. SFP-CA Service Usage Organization A organization Organization B Constraints & Virtual Funding Account oVFA SUCL Limits Service Provider Manager Charging Interruption Rate Manager Service Tariff Service Trigger This domain does not offer a service Map Service Provider Identity Provider IdP User User Account user Balance Virtual Funding Account uVFA ABM Manager Charging Manager CM AAI / SSO System One-time interaction Service request Multiple times interaction© 2012 UZH, CSG@IFI 8
  9. 9. Summary & future work The SFP-CA enables the inter-domain charging functionality for federations – User & organization level The SFP-CA enables the real-time service access decision making – Grant access – Interrupt service The SFP-CA handles a large scenario set of charging requests – Local & guest users – Event & session based services – Offline & online charging SSO system + SFP charging mechanism => Efficiency Implementation of the SFP-CA (printing, SMS, VoIP)© 2012 UZH, CSG@IFI 9
  10. 10. Q&A© 2012 UZH, CSG@IFI 10