ISSN : 1796-2021
Volume : 3    Issue : 4    Date : September 2008

Impacts of Radio Access Protocols on Cooperative Vehicle Collision Avoidance in Urban Traffic
Fan Yu and Subir Biswas
Page(s): 41-48
Full Text:
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This paper p resents the design of a Cooperative Collision Avoidance application, and evaluates its
performance with DSRC-recommended 802.11 Medium Access Control (MAC) and with a novel
Vehicular Self-Organizing MAC (VeSOMAC) protocol. VeSOMAC is designed as a fully distributed
TDMA protocol that relies on an in-band control exchange technique for autonomous TDMA slot
allocation among vehicle-mounted wireless communication modules. A hybrid traffic and wireless
network simulator has been developed for evaluating both network level and application level
performance in the presence of different wireless access protocols. Detailed network and vehicular
traffic simulation models have also been developed for evaluating a Cooperative Collision Control
(CCA) application, operating in urban traffic intersection scenarios. Simulation results demonstrate
that unlike the 802.11 style contention based protocols, a schedule based protocol such as
VeSOMAC can offer better vehicle safety performance through smaller and bounded packet latency
in vehicular ad hoc networks.

Index Terms
Inter-vehicle Networks, MAC, Selfconfiguration, Intelligent Transportation System, DSRC