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Cooperative Vehicle Information Delivery Scheme for ITS Networks with OFDM Modulation Techniques

Authors:
Katsuhiro Naito
Kazuo Mori
Hideo Kobayashi

Keywords: VANET, ITS networks, OFDM, Media access control, Vehicle information

Abstract:
Vehicular Ad Hoc Networks (VANETs) are new technologies that offer many opportunities to wide range interesting services. Safe driving applications in Intelligent Transport System (ITS) are major applications of VANETs. In the high-speed mobility environment of VANETs, failure transmission due to change of vehicle positions, fluctuation of channel condition and blocking by large vehicles may decrease reachability of vehicle information messages for safety usage. In this paper, we focus on an OFDM transmission technology, which is employed in IEEE 802.11p for ITS networks. In the proposed scheme, some vehicles forward a same OFDM signal at almost same instance, which is less than a guard interval period. Therefore, vehicles can demodulate some same OFDM signals from different vehicles, and can obtain path diversity effect through some different vehicles. This paper also proposes a new media access control scheme to achieve the proposed transmission technology. The proposed media access control scheme is based on carrier sense multiple access (CSMA). Meanwhile, some forwarder vehicles can select the same random back-off period autonomously to synchronize transmission timing. As the results, the proposed scheme can achieve the high delivery ratio of vehicle information messages and reduce transmission delay. Finally, we consider vehicle movements, channel fluctuation due to fading and blocking due to large-size vehicle in computer simulations. The numerical results show that the proposed scheme can achieve the high delivery ratio with the short delay even if actually real environment, which considers fast movement, blocking, fading, is evaluated in the simulations. Moreover, we clarify that our scheme has high scalability in case of increasing of vehicles.

Pages: 175 to 182

Copyright: Copyright (c) IARIA, 2011

Publication date: January 23, 2011

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-113-7

Location: St. Maarten, The Netherlands Antilles

Dates: from January 23, 2011 to January 28, 2011