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Enhancement of Delivery of Warning Messages for Mobile Networks

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Author(s): Chia-Sheng Tsai | Wun-Kai Du

Journal: Journal of Networks
ISSN 1796-2056

Volume: 3;
Issue: 7;
Start page: 16;
Date: 2008;
Original page

Keywords: vehicle-to-vehicle communications | DSRC | mobile networks

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.
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