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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)
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)
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)
The widespread use of heterogeneous wireless network technologies and their integration with multi-mode terminals enable users to be associated to the best available networks according to user preferences and application specific requirements. We study a user-centric quality of experience based resource allocation problem with several operators, several(More)
Wearable computers are often cited as an enabling technology for out-of-office applications. In fact, there has been a considerable amount of work on industrial applications of wearables. However, with the notable exception of the symbol arm-worn system, this research has had little impact on industrial practice. The wearIT@work project is a 4 1/2-year(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)
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)