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A Comparison of Single- and Multi-hop Beaconing in VANETs

Mittag, Jens 1; Thomas, Florian 1; Härri, Jérôme 1; Hartenstein, Hannes 1
1 Institut für Telematik (TM), Karlsruher Institut für Technologie (KIT)


Optimizing vehicular communication strategies is important for an efficient usage of the available wireless bandwidth and also critical for the success of VANETs. In this paper we address the fundamental and practical question whether the load on the wireless channel can be reduced if periodic beacon messages are transmitted over multiple hops with reduced transmit power instead of being transmitted over one hop with high transmit power. In particular, we look at the possible bandwidth savings that can be achieved by piggybacking forwarded messages into the own next beacon transmission. For that matter, we first propose an analytical model to compute a lower bound for the resulting channel load when single- or multi-hop dissemination of beacons is performed. In this model we assume optimal channel conditions and perfect relaying and piggybacking decisions to show that a reduction of the load by multi-hop is possible and closely related to piggybacking. Further, we show that the possible savings depend on the ratio between the size of the header and the payload of a beacon and that a reduction of the load is theoretically possible if the header is larger than the payload - what would be the case in VANETs if security overheads are considered part of the header. ... mehr

DOI: 10.1145/1614269.1614282
Zitationen: 78
Zitationen: 73
Zugehörige Institution(en) am KIT Institut für Telematik (TM)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2009
Sprache Englisch
Identifikator ISBN: 978-160558737-0
KITopen-ID: 1000014821
Erschienen in Proceedings of the sixth ACM International Workshop on Vehicular Ad Hoc Networking, Beijing, China, September 2009 (VANET 2009)
Verlag Association for Computing Machinery (ACM)
Seiten 69-78
Nachgewiesen in Scopus
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