Kenji Leibnitz

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Data applications are expected to play an increasingly important role in the next generation mobile communication services. To plan these networks detailed models of data users with diverse applications are required. The purpose of this study is to provide practically usable traffic models for data users in GPRS networks. We start with a discussion of(More)
In structured peer-to-peer (P2P) networks participating peers can join or leave the system at arbitrary times, a process which is known as churn. Many recent studies revealed that churn is one of the main problems faced by any Distributed Hash Table (DHT). In this paper we discuss different possibilities of how to estimate the current churn rate in the(More)
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In this paper we consider the problem of coverage in a wireless sensor network where nodes already have been previously deployed. Our goal is to design an efficient strategy to add further nodes for achieving a certain target K-coverage throughout the entire monitoring region. A heuristic approach based on a dynamic model resembling gas bubbles is applied(More)
Peer-to-Peer (P2P) applications have become highly popular in today’s Internet due to the spread of file sharing platforms such as KaZaa, eDonkey, and BitTorrent. P2P technologies have emerged from disruptive, grey-scale applications to developments of business-cases. In this paper we investigate the diffusion behavior in an eDonkey-like system. We use(More)
In this paper we investigate the impact of a clustered traffic distribution on the coverage and capacity of a CDMA cell and its implications on network planning. We assume the users to be distributed according to a spatial Poisson process and derive expressions for outage probability as quality-of-service (QoS) measure. This allows the derivation of a(More)