Joachim Hillebrand

Learn More
In the recent years, the Ethernet technology has grown rapidly, mainly due to its applicability in local area networks. High data rates, low cost, collision reduction with the full-duplex approach and the elimination of chaining limits inherent in hubbed Ethernet networks have made the switched Ethernet a dominant network technology. Although the switch(More)
In this paper we investigate the 60 GHz in-car wideband radio channel to assess the feasibility of 60 GHz high bit rate radio communication inside a car. The investigations are based on a measurement campaign comprising different applicationoriented transmission scenarios and propagation conditions. We analyze the channel gain, time dispersion and frequency(More)
Efficient support for multimedia communication is essential for next generation mobile wireless networks. In order to provide the necessary quality of service (QoS) on demand in mobile wireless networks, appropriate signaling has to be defined. We present a mobility-aware QoS signaling architecture that integrates resource management with mobility(More)
Future vehicles will be wirelessly connected to nearby vehicles, to the road infrastructure and to the Internet in order to enable new comfort features, safety functions and a number of new vehicle-specific services. The latter will include a fast, secure, and reliable way to remotely diagnose and reconfigure a vehicle as well as to install new software on(More)
Wireless software updates for vehicles are very beneficial for both customers and manufacturers, as they enable performance improvements and error correction without the need of vehicle recalls, as well as a reduction of warranty costs and continuous system upgrades over a vehicle's whole lifetime. However, adding a wireless interface to enable software(More)
This paper presents a comprehensive survey on the two most popular transport layer protocols; TCP and UDP. The aim is to understand the key terminologies of TCP and UDP and to understand the key differences between them. This paper lists out the functions and basic operation of both protocols (TCP and UDP) and finally a comparison between the two protocols(More)
Due to the rising number of electronic control units (ECU) in a vehicle and the growing complexity of the related software installed, a fast and efficient system for updating software is needed. Wireless software updates similar to firmware over the air updates for smartphones can be a suitable solution to solve this issue. In this paper we propose a(More)
Complexity in modern vehicles has increased dramatically during the last years due to new features and applications. Modern vehicles are connected to the Internet as well as to other vehicles in close proximity and to the environment for different novel comfort services and safety-related applications. Enabling such services and applications requires(More)
Efficient support for multimedia communication is essential for next generation mobile wireless networks. In order to provide the necessary Quality of Service (QoS) in mobile wireless networks, appropriate signaling has to be defined. We discuss several approaches and design issues of mobility-aware QoS signaling including on/off-path signaling and(More)
We analyze and compare various transport protocols in the context of wireless in-vehicle IP-based audio and video communication. We determine the most appropriate transport protocol and discuss its benefits for an application in the car. The analyses are accomplished based on the IEEE 802.11 standard. A testbed is used to measure and compare quality of(More)