信标率控制方法在车载自组织网络中的应用

Applications of Beaconing Rate Control in VANETs

车载自组织网络是一辆车通过信标,来感知它附近的其他车辆,并允许车辆在无固定设施的情况下进行通信。VANET的应用依赖于信标来加强信息共享,但在不同时间,车辆处于不均匀分布状态,固定的信标率会导致信道拥塞。基于此,提出一种适应性信标率控制机制,使得车辆之间的精准感知和网络负载之间进行折中。基于模糊逻辑决策系统,所提方法把同方向运行车辆的比例和车辆状态作为模糊决策系统的输入,根据车辆通信特征来调节信标率。仿真结果表明,与固定信标方案相比,所提方案能够提高信道负载和车辆间的协同感知,有效降低了平均数据包端到端延迟。

Vehicular Ad Hoc Network is such a network that a vehicle is aware of other vehicles through beaconing, and communicates with other vehicles in the absence of fixed infrastructure. The applications of VANET rely on beaconing to enhance information sharing, but at different time, the vehicle is distributed unevenly, and the fixed beaconing rate will lead to channel overloading. So, we propose an adaptive beaconing rate mechanism which compromise between network load mad precise awareness between vehicles. Based on fuzzy logic system, the proposed approach considers the percentage of vehicles traveling in the same direction, and status of vehicles as inputs of the fuzzy decision making system, and tunes the beaconing rate according to the vehicular traffic characteristics. Simulation results show that, compared to the fzxed beaconing rate approach, the proposed approach is able to improve channel load and coonerative awareness between vehicles, and also reduce averaee nacket delay.