A Dynamic Broadcast Scheme of Emergency Warning Message in Vehicular Ad Hoc Network

Yun Won CHUNG  Ji Hoon KIM  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.5    pp.1447-1451
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1447
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
broadcast,  emergency warning message,  vehicular ad hoc network,  

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In the vehicular ad hoc network (VANET), broadcast is used to disseminate emergency warning messages (EWM) in public safety applications and delay is one of the most stringent requirements. Although flooding is the simplest broadcast scheme, it introduces a broadcast storm problem, and numerous broadcast protocols have been proposed for VANET in order to improve the performance of broadcast. In this letter, we analyze the tradeoff between two location-based broadcast protocols, i.e., distance-based relay selection (DBRS) and range-based relay selection (RBRS) schemes under various vehicular densities. Then, we propose a dynamic broadcast scheme, which selects an appropriate scheme from DBRS and RBRS, based on the estimation of vehicle density. The results of a performance analysis show that the proposed scheme dynamically selects the better scheme for varying vehicle density.