Werner Wiedermann

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—In this contribution we address the problem of using cellular network signaling for inferring real-time road traffic information. We survey and categorize the approaches that have been proposed in the literature for a cellular-based road monitoring system and identify advantages and limitations. We outline a unified framework that encompasses UMTS and GPRS(More)
—In this paper we present a road traffic estimation system built on top of the cellular network infrastructure. Based on the concept that many road users are also customers of a cellular operator, we show that specific road conditions map to certain signaling patterns in the cellular core network. In order to estimate the road traffic, signaling is(More)
The provisioning of Quality-of-Service and the interworking between heterogeneous mobile environments will be of vital importance for the future economic success of mobile telecommunications. This paper presents a strictly practical performance evaluation of live and lab UMTS/GPRS/WLAN networks as performed within the project WISQY – Wireless Inter-System(More)
This book series features volumes composed of select contributions from workshops and conferences in all areas of current research in mathematics and statistics, including operation research and optimization. In addition to an overall evaluation of the interest, scientific quality, and timeliness of each proposal at the hands of the publisher, individual(More)
rapidly growing bandwidth demand for mobile internet and mobile broadband applications is currently triggering the development of novel approaches to increase the capacity of the macro infrastructure of current mobile networks. Among the available options, increasing the spatial density of mobile sites is of specific interest, while at the same time the(More)
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