Karsten Roscher

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Geonetworking and the corresponding routing protocols play an important role in application of Vehicular Ad-hoc Networks (VANETs). This paper presents the architecture and implementation of CLWPR (Cross-Layer, Weighted, Position-based Routing), a position-based routing protocol optimized for VANETs in NS-3 simulation environment. It utilizes mobility(More)
The main challenges when realizing safety related applications based on vehicle-to-x communication are scalability and reliability. With an increasing number of vehicles, the communication channel must not get congested especially if a large amount of information has to be transmitted over multiple hops to a destination. This challenge can be solved by(More)
Multi-hop forwarding in VANETs remains a chal­ lenging task. Existing protocols either focus on high packet delivery ratios or low latencies. In this paper, we propose Low­ Delay Forwarding with Multiple Candidates (LDMC), a novel geographic routing approach using a combination of sender­ based forwarder selection and receiver-based coordination of multiple(More)
Wireless intelligent transport systems based on Car-to-X communication technology are about to enter the mass market in upcoming years. Thereby, efficient and reliable security systems are a core point of concern in system design. Currently regarded digital signature schemes using pseudonym certificates can introduce significant overhead into the highly(More)
Vehicular ad hoc networks (VANETs) are envisioned to support driver assistance and automated driving posing strict requirements on communication reliability and delay. To support these applications, we propose Low Delay Forwarding with Multiple Candidates (LDMC), a geographic routing approach combining the advantages of sender-based control and(More)
Vehicular ad hoc networks (VANETs), often called Car2X communication systems, are about to enter the mass market in upcoming years. They are intended to increase traffic safety by enabling new safety critical driver assistance systems. This also means that strong security mechanisms are required to safeguard communication within VANETs. However,(More)
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