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
    On the aggregation of deterministic service flows
    ( 2001)
    Schmitt, J.
    ;
    Karsten, M.
    ;
    Steinmetz, R.
    It is common belief that "flat" Quality of Service (QoS) architectures, e.g. the IETFs Integrated Services architecture (IntServ), are not scalable to large networks, e.g. the global Internet. This is due to the ambitious goal of providing per-flow QoS and the resulting complexity of fine-grained traffic management. One solution to this problem is the aggregation of traffic flows in the core of the network, thus creating a hierarchical resource allocation system. While one might suspect that aggregation leads to allocating more resources for the aggregated flow than for the sum of the separated flows if flow isolation shall be guaranteed deterministically, we show in this article that for IntServ's Guaranteed Service flows this is not necessarily the case even if flow isolation is retained. We compare different approaches to describe the aggregated traffic and analyze their impact on bandwidth consumption and ease of flow management. Furthermore, we perform a thorough numerical evaluation of the derived results with respect to their behavior in response to changes in exogenous parameters like the traffic specifications of the flows or the configuration of the network. Applications of these theoretical insights and numerical evidence could be to use the derived formulae for resource allocation in either a hierarchical IntServ, IntServ over DiffServ (Differentiated Services), or IntServ over ATM (Asynchronous Transfer Mode) network.
  • Publication
    A price communication protocol for multi-service internet
    ( 2001)
    Heckmann, O.
    ;
    Darlagiannis, V.
    ;
    Karsten, M.
    ;
    Steinmetz, R.
  • Publication
    On the Feasibility of RSVP as General Signalling Interface
    ( 2000)
    Karsten, M.
    ;
    Schmitt, J.
    ;
    Berier, N.
    ;
    Steinmetz, R.
  • Publication
    Mechanisms for QoS signaling in a mobile internet environment
    ( 2000)
    Berier, N.
    ;
    Karsten, M.
    ;
    Schmitt, J.
    ;
    Steinmetz, R.
  • Publication
    Cost and price calculation for internet integrated services
    ( 1999)
    Karsten, M.
    ;
    Schmitt, J.
    ;
    Wolf, L.
    ;
    Steinmetz, R.
  • Publication
    A Policy-Based Service Specification for Resource Reservation in Advance
    ( 1999)
    Karsten, M.
    ;
    Berier, N.
    ;
    Lars, W.
    ;
    Steinmetz, R.
  • Publication
    An approach to pricing of connectionless network services
    ( 1998)
    Steinmetz, R.
    ;
    Karsten, M.