Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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  • Publication
    VC management for heterogeneous QoS multicast transmissions
    ( 2002)
    Schmitt, J.
    ;
    Wolf, L.
    ;
    Karsten, M.
    ;
    Steinmetz, R.
    A crucial component of the interaction between ATM's and the Internet's Quality of Service (QoS) architectures is the efficient mapping of RSVP (Resource reSerVation Protocol) as the Internet's signalling protocol onto the according ATM mechanisms. In particular, this article focuses on one of the most contrary characteristics of RSVP and ATM signalling. This is the support for heterogeneous reservations by RSVP over the ATM subnetwork, taking into account that ATM only allows for a homogeneous QoS within a single Virtual Circuit (VC). We present previous approaches to the solution of this problem and argue for more sophisticated and efficient approaches to manage ATM VCs taking into consideration ATM tariffs and resource consumption.
  • Publication
    Charging for packet-switched network communication - motivation and overview
    ( 2000)
    Karsten, M.
    ;
    Schmitt, J.
    ;
    Stiller, B.
    ;
    Wolf, L.
    Packet-switched network technology is expected to form the integration layer for future multi-service networks. The trend to integrate voice and data traffic can already be observed in the Internet and is expected to carry on until the full integration of all media types is achieved. At the same time it becomes obvious that the business model employed for current Internet usage is probably not sustainable for the creation of an infrastructure suitable to support a diverse and ever-increasing range of application services. Currently, the Internet provides only a single class of best-effort service and prices are mainly built on flat-fee, access-based schemes. However, the large and increasing differentiation of demand for quality of transmission services creates the necessity to differentiate service provision and, consequently, charging for network communications. In this article, we survey relevant service models and motivate the need for appropriate charging mechanisms. We give an overview on requirements for a charging system, its technical components, and issues for future business models that might by employed by service providers.