Active safety and advanced driver assistance systems based on vehicular ad hoc networks can significantly increase passenger safety and comfort. For communication systems based on time-slotted multiple access schemes, time synchronization among the rapidly moving vehicles is required. In this paper, a new scheme for decentralized time synchronization is proposed. It will be derived analytically, that using existing schemes, a common systematic drift of the node timing can be observed, caused by the propagation delay. If the average propagation delay to nodes within the respective synchronization range differs from node to node, a remaining timing offset will be observed between stations, in a steady state. Depending on the network topology, this timing offset can be large enough to violate the constraints for a synchronous operation. In contrast, using the proposed scheme, a systematic drift of the node timing can be avoided, completely. Compared to existing schemes, the remaining timing offset is much smaller and the requirements for synchronous operation can be met.
Aspects of decentralized time synchronization in vehicular ad hoc networks
Aspekte der dezentralen Zeitsynchronisation für fahrzeugspezifische Ad-hoc-Netze
2004
6 Seiten, 6 Bilder, 1 Tabelle, 10 Quellen
Conference paper
English
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