Andreas Timm-Giel

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In this work, we investigate the use of directional antennas and beam steering techniques to improve performance of 802.11 links in the context of communication between amoving vehicle and roadside APs. To this end, we develop a framework called <i>MobiSteer</i> that provides practical approaches to perform beam steering. <i>MobiSteer</i> can operate in two(More)
—Network Virtualization is claimed to be a key component of the Future Internet, providing the dynamic support of different networks with different paradigms and mechanisms in the same physical infrastructure. A major challenge in the dynamic provision of virtual networks is the efficient embedding of virtual resources into physical ones. Since this problem(More)
Wireless Sensor Networks (WSNs) have a broad application range in the area of monitoring and surveillance tasks. Among these tasks, disaster detection or prevention in environmental scenarios is one typical application for WSN. Disasters may for example be forest fires, volcano outbreaks or flood disasters. Here, the monitored events have the potential to(More)
This paper studies a comprehensive dimensioning approach to design the UMTS access networks for elastic Internet traffic carried by the TCP protocol. The dimensioning approach is based on the M/G/R Processor Sharing (M/G/R-PS) queuing model for application performance. With considering all TCP connection aspects, an adjustment on the extended M/G/R-PS model(More)
—Virtualization of wireless networks has received more and more research attention. As a means to reduce the investment of mobile network operators and to improve the network performance, LTE (Long Term Evolution) virtualization is one important study cases in the scope of wireless virtualiza-tion. To investigate the advantages of virtualization on the LTE(More)