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VANETs are playing an increasing role in the development of communication and traffic assistance in transportation. Therefore mobility simulations are needed to predict the impact of new ideas on the VANET. But the interest in adding new applications to vehicles may differ largely according to the traffic scenarios. It seems too complicated to have one integrated mobility simulator that deals with...
The number and distance of Road Side Units (RSU) needed for continuous delivery of traffic status information strongly depends not only on the topology of the road but also on traffic density. In this paper the effect of traffic density is analyzed for different mobility patterns in a car environment. Different scenarios as city and urban are considered with stress on motorway scenarios. Also different...
In this paper, communication with and inside trains is analysed. Existing communication links to trains are exemplified. A semi-automated planning tool for basic calculations of the positions of base stations is shown. It is detailed, how this tool may simplify the planning process for different usage scenarios. In addition, the distribution of signals inside and between the train's coaches is described...
Security in communication systems is manifold. It can be classified in two categories: functional security and information or data security. In this paper, the different aspects of security are explained. Then different scenarios of communication networks in transportation systems are analyzed with respect to their inherent the security threats. After the introduction of some existing communication...
This paper presents different use cases and scenarios for communication in transportation systems. Thereby, it highlights their differences in terms of planning constraints. Some existing networks and their parameters are introduced. Based on that, strategies for hybrid use of the same communication network infrastructures for different purposes are analyzed. Finally, protocols for interworking of...
Software-defined radios have received much attention recently, but only little work has targeted the identification of those components that have the highest impact on the quality of the signal transmission and reception. In this paper we therefore have a closer look at the reception path in wireless communication systems. We provide a general overview of those transmit/receive components which play...
In this paper several shortcomings in communication with high-speed users in different communication scenarios are identified. This includes conventional communication systems as well these especially designed for use with railways systems, e.g. GSM-R. In the high-speed scenario there are several challenges including Doppler Effect, short duration of stay in a cell, and rapidly changing propagation...
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