V2V Comm Protocol

Vehicular communication systems, Media access control, Fading

A Vehicle-to-Vehicle Communication Protocol
for Cooperative Collision Warning
Xue Yang
University of Illinois at Urbana-Champaign
Jie Liu
Microsoft Research
Feng Zhao
Microsoft Research
Nitin H. Vaidya
University of Illinois at Urbana-Champaign
nhv@uiuc.edu Abstract
This paper proposes a vehicle-to-vehicle communication
protocol for cooperative collision warning. Emerging wireless technologies for vehicle-to-vehicle (V2V) and vehicleto-
roadside (V2R) communications such as DSRC [1] are
promising to dramatically reduce the number of fatal roadway accidents by providing early warnings. One major
technical challenge addressed in this paper is to achieve
low-latency in delivering emergency warnings in various
road situations. Based on a careful analysis of application
requirements, we design an effective protocol, comprising
congestion control policies, service differentiation mechanisms and methods for emergency warning dissemination.
Simulation results demonstrate that the proposed protocol
achieves low latency in delivering emergency warnings and
efficient bandwidth usage in stressful road scenarios.
1. Introduction
Traffic accidents have been taking thousands of lives
each year, outnumbering any deadly diseases or natural disasters. Studies [18] show that about 60% roadway collisions
could be avoided if the operator of the vehicle was
provided warning at least one-half second prior to a collision. Human drivers suffer from perception limitations on
roadway emergency events, resulting in large delay in propagating emergencywarnings, as the following simplified example
illustrates. In Figure 1, three vehicles, namely , ,
This work was funded in part by Palo Alto Research Center while the first author worked there as a summer intern. The first author is also supported in part by Vodafone-U.S. Foundation Graduate Fellowship. and , travel in the same lane. When suddenly...
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