Im Laufe des vergangenen Jahrzehnts sind zahlreiche Versuche gescheitert, die Funktionalität von IP grundlegend zu erweitern. Um dennoch dringend benötigte Funktionalität, wie z.B. Gruppenkommunikation, zu ermöglichen, werden verstärkt sog. Peer-to-Peer-Ansätze (P2P) eingesetzt, die eine unmittelbare Umsetzung neuer ...

In modern information systems the dominant retrieval paradigms have shifted from exact matching towards retrieving a list of the most relevant objects. This is because users usually are not satisfied by arbitrarily large and unordered answer sets, but rather interested in small sets of ”best” answers. All popular ranking ...

Strukturierte Peer-to-Peer (P2P) Netzwerke weisen heutzutage immer weniger Fehleranfälligkeit oder signifikante Skalierbarkeitsprobleme auf. Sie bilden daher eine gute Basis für anspruchsvolle Aufgaben, wie z.B. Gruppenkommunikation oder Online-Spiele. Overlay-Netze bilden ein logisches Netzwerk für Anwendungen und ...

The performance of an eDonkey-based mobile P2P file-sharing system is investigated by means of time-dynamic simulations. We show in detail that the sizes of the swapping entities, i.e. chunks and blocks, influence the time required for downloading a file. The performance depends on mobile P2P specific factors, like the ...

This paper presents a new TCP-based packet pair measurement approach for network path capacity estimation. It addresses some drawbacks other approaches still bear. In contrast to these, our approach uses an unmodified TCP sender and utilizes techniques to identify probing packets that were less influenced by cross traffic. ...

Traditional network management has to cope with the disadvantages that come along with a central management unit. In this paper we present a framework for distributed network management using a p2p overlay network consisting of several Distributed Network Agents. The framework provides a reliable and scalable basis for ...

The document will give a brief overview of the Presence and Availability -specification in general, protocols used in the IP Multimedia Subsystem - namely SIP and Diameter - and will show a possible mapping for PAM-methods to the underlying infrastructure. In addition it will describe the IMS infrastructure developed at ...

Der Einsatz von Peer-to-Peer-Architekturen für verteilte Geschäftsprozesse kann gegenüber einem Client-Server-Ansatz Vorteile aufweisen. In diesem Paper werden diese Vorteile für die Erstellung von Flächennutzungsplänen diskutiert. Es handelt sich dabei um einen langwierigen, komplexen verteilten Prozess mit zahlreichen ...

The goals of the interdisciplinary project HORN were as well to improve competitiveness of service providers that deliver grocery items as to develop new hardware and software needed for its realisation. In the first part, we introduce this home replenishment project, and analyse the needs and challenges of mobile services ...

This paper compares traditional location management, which focuses on tracking mobile subscribers in the topology of a cellular network, with position management, which we define to be a set of functions for tracking mobile targets in terms of geographic positions as needed for LBSs. As the air interface is the most ...