Thomas Jansen

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In this paper we present system level simulation results of a self-optimizing load balancing algorithm in a longterm-evolution (LTE) mobile communication system. Based on previous work [2][1], we evaluate the network performance of this algorithm that requires the load of a cell as input and controls the handover parameters. We compare the results for(More)
Handover parameter optimization is a selfoptimizing network (SON) use case that promises significant performance improvement of the radio network. The basic idea is to adapt the handover control parameters, hysteresis and time-to-trigger, to the individual cell situation, in terms of e.g. the building density, cell environment and degree of user mobility.(More)
Self-organisation (self-optimisation, self-configuration, and selfhealing) methods are a promising concept to automate wireless access network planning, deployment and optimisation. This paper contains a mind setting exercise. First the mechanisms for which self-organisation is anticipated to be effective and feasible are identified. Then technical and(More)
PURPOSE Extensive radiotherapy volumes for tumors of the chest are partly caused by interfractional organ motion. We evaluated the feasibility of respiratory observation tools using the active breathing control (ABC) system and the effect on breathing cycle regularity and reproducibility. METHODS AND MATERIALS Thirty-six patients with unresectable tumors(More)
This study describes the experience with hypofractionated radiation therapy of squamous cell carcinoma and melanoma in dogs and cats. A total dose of 32-48 Gray (Gy) was delivered once a week in 8 Gy fractions. 34 animals in which a complete surgical excision was impossible were treated. There was no tumor detectable macroscopically in 14 patients at the(More)
This paper presents an enhanced version of a self-optimizing algorithm that tunes the handover (HO) parameters of a LTE (Long-Term Evolution) base station in order to diminish the negative effects that can be introduced by handover (radio link failures, HO failures and ping-pong handovers) and improve the overall network performance. While the default(More)
Femto cells in LTE are attracting more and more attention since they are expected to provide substantial indoor network coverage. In contrast, the interference level on the outside increases with every new indoor base station, so that it is crucial to gain in-depth knowledge of the propagation phenomena from indoor to outdoor environments. Therefore, an(More)