关键词: 连接性, 最小发射功率, 路径中断概率, 车载网

Abstract: Data transmission technology in VANETs（Vehicular Ad-hoc Networks） obtains more attention since that VANETs is able to provide road safety, vehicle traffic management and infotainment service. However, the changed topology and fast moving vehicle accelerate the fracture of communication link between vehicles, and reduce the reliability of communication links. Therefore,the multi-hop connectivity properties of VANETs based on a physical layer based Quality of Service（QoS） criterion in terms of average end-to-end path outage probability are analyzed.Under this approach, a multi-hop path joining a pair of vehicles is considered to be connected if and only if the average end-to-end path outage probability meets a target requirement. An analytical model to compute the average end-to-end path outage probability of a connected path is presented. This paper then investigates the minimum transmit power and maximum number of hops satisfying an average path outage probability constraint. The validity of the theoretical analysis is verified by simulation.Simulation results show that a suitable power control algorithm can improve the data transmission path.

Key words: connectivity, minimum transmit power, path outage probability, Vehicular Ad hoc Networks（VANETs）