EEMCS

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Abstract

The application of Driver Support Systems (DSS) is an emerging trend in the automotive industry. Advances in technology enable faster, smaller and more versatile hard- and software systems while consumers demand safer and more efficient cars. A DSS aims to meet the consumer’s demand with technologically feasible solutions. The Ph.D. Thesis “Driver Support in Congestion? by C.J.G. van Driel proposes a suite of Driver Support Systems called the Congestion Assistant. The Congestion Assistant functions by means of over-the-horizon awareness to aid the driver in traversing traffic congestion on highways. Subsystems are proposed to aid the driver and supply the driver with information. The Congestion Assistant has been tested at a functional level, but an information dissemination system was not presented in the study. In the design information was assumed to be instantaneously and reliably available.

A DSS, which relies on over-the-horizon awareness in a mobile environment, poses some interesting demands on the communication system designed to distribute this information. For instance, latency must be minimal in order to guarantee freshness of information, even if it has
travelled several kilometers along the road.

This thesis covers the design of a communication system aimed to provide the over-the-horizon awareness to the Congestion Assistant. Several options are considered and an approach based on multi-hop Vehicle-to-Vehicle communication is proposed. The over-the-horizon aware-
ness can be represented in a structure called a TrafficMap. This is a speed pro?le which expresses the traffic flow speed at a certain location on the road in a highly compressed form. The TrafficMap is built by means of a distributed system called the TraffiFilter, which is proposed in this thesis. This system is present in all intelligent vehicles on the road; together they build the
over-the-horizon view.

A protocol is designed to disseminate the required information in an efficient manner. A directional flooding approach is reasoned to be the most appropriate way to distribute the TrafficMap to all relevant vehicles on the road. A modi?cation to the slotted 1-Persistence
Flooding strategy is proposed and evaluated. This modi?cation enables the use of an IEEE 802.11p MAC and physical layer and perform network-layer flooding in an efficient manner by exploiting MAC layer scheduling properties.

Simulation studies are performed to evaluate the performance of the system. The influence of mobility on the communication and the quality of the communicated information with respect to error rate and latency is evaluated. The TrafficFilter is found to be a viable system to build over-the-horizon awareness for future DSS like the Congestion Assistant.

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