JOURNAL OF NETWORKS (JNW)
ISSN : 1796-2056
Volume : 3    Issue : 7    Date : July 2008

Enhancement of Delivery of Warning Messages for Mobile Networks
Chia-Sheng Tsai and Wun-Kai Du
Page(s): 16-25
Full Text:
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Abstract
Vehicle-to-vehicle (V2V) communication systems have been studied extensively in recent years by
transportation experts worldwide. Such systems enable the transmission of warning messages
(alarms) between vehicles without additional roadside infrastructure. Thus, messages can be sent
faster than through base stations. Because of these advantages, researchers worldwide are
exploring how this technology can improve traffic safety. However, the various V2V schemes
proposed thus far share the same problem: (1) unnecessary repetition of warning messages and
(2) transmission to inapplicable respondents. This study proposes a new method for delivering V2V
warning messages which reduces the redundant messages common in current schemes. Here,
three schemes to deliver alarms are considered. One is blind flooding to broadcast alarms.
Warning messages are routed by AODV protocol. Another is called Two Lanes. The broadcasting
region of alarms is limited in two traffic lanes nearby a traffic accident only. And the last one is the
proposed strategy where a warning message received by a car will be simply checked the prime
number carried within the alarm header and decided whether the car is responsible to deliver it. If
necessary, it will be forwarded to the next nodes. Otherwise, the redundant warning message shall
be discarded to release system load and avoid to suspend other normal transmission proceeding.
The results reveal that minimizing the delays caused by such redundant messages enables
warnings to be sent to drivers more rapidly. Also, it prioritizes warning messages so that drivers are
apprised of the most serious and dangerous traffic accidents. Moreover, another key finding in this
paper is that the radii of the broadcasting coverage shall be adjusted carefully and adaptively to
optimize the system performance.

Index Terms
vehicle-to-vehicle communications, DSRC, mobile networks