Dynamic Transmitting Power Adjustment in Cooperative Vehicular Safety Applications
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Monday, October 17, 2011: 2:00 PM
S320E (Orange County Convention Center )
Description of Paper:
Cooperative vehicular safety application is a critical ITS service in traffic management. Each OBU must periodically broadcast its current status to its neighboring vehicles. Because of lacking the transmitting power adjustment, each OBU always use the maximum transmitting power. From our experiments, at heavy traffic flow, the higher transmitting power causes the wireless channel contentions and packet collisions more serious. In this paper, we identify out these problems and propose the dynamic transmitting power architecture to soften these situations based on the carís speed, position, and vehicle density. Besides, we also present three procedures, which are safety broadcast procedure, event-driven warning procedure, and hazard detecting procedure, not only to reduce the traffic accidents but also to increase the delivery rate of safety packet disseminating. Finally we verify our results by simulations and make conclusions.