Vehicle-to-Vehicle communication can cogently improve traffic safety because it grants drivers better situational awareness and strengthens inter-cooperation among them. However, the current policy obliges the safety-critical messages, i.e., Basic Safety Messages (BSMs) and Event Safety Messages (ESMs), to be transmitted exclusively in one single channel over the Dedicated Short-Range Communication (DSRC) spectrum, which may incur severe channel congestions, intolerable communication delays, and higher accident probabilities. To alleviate the channel congestion, popular measures focus on adaptively adjusting the transmission parameters, e.g., packet generating rate. However, due to the narrow bandwidth of a single channel, these methods can hardly ensure timely delivery of critical safety-related messages when the density of DSRC-enabled vehicles becomes high. Instead of sticking to only one single channel, this paper applies a dynamic channel selection algorithm to thoroughly exploit the entire DSRC band resource and reduce the transmission delay. To demonstrate the effectiveness of the utilized algorithm, we conduct experiments under two representative scenarios, i.e., a cooperative adaptive cruise control scenario and a run-the-red-light scenario at an intersection. Experimental results show that the transmission delays of both the BSMs and the ESMs could be effectively reduced, yielding an improved vehicle platoon control accuracy, string stability, and collision avoidance performance.

车对车通信可以切实提高交通安全性，因为它可以使驾驶员更好地了解情况，并加强彼此之间的合作。但是，当前策略要求安全关键消息（即基本安全消息（BSM）和事件安全消息（ESM））只能在专用短程通信（DSRC）频谱上的单个通道中传输，这可能会导致严重的信道拥塞，无法忍受的通信延迟以及更高的事故概率。为了减轻信道拥塞，流行的措施集中于自适应地调整传输参数，例如分组生成速率。但是，由于单个通道的带宽较窄，当启用DSRC的车辆密度很高时，这些方法几乎无法确保及时发送与安全相关的关键消息。本文提出了一种动态信道选择算法，以充分利用整个DSRC频带资源并减少传输延迟，而不是仅停留在单个信道上。为了证明所使用算法的有效性，我们在两个有代表性的场景下进行实验，即协作自适应巡航控制场景和交叉路口的红灯运行场景。实验结果表明，可以有效降低BSM和ESM的传输延迟，从而提高了车辆排的控制精度，弦稳定性和防撞性能。本文应用动态信道选择算法来充分利用整个DSRC频带资源并减少传输延迟。为了证明所使用算法的有效性，我们在两个有代表性的场景下进行实验，即协作自适应巡航控制场景和交叉路口的红灯运行场景。实验结果表明，可以有效降低BSM和ESM的传输延迟，从而提高了车辆排的控制精度，弦稳定性和防撞性能。本文应用动态信道选择算法来充分利用整个DSRC频带资源并减少传输延迟。为了证明所使用算法的有效性，我们在两个有代表性的场景下进行实验，即协作自适应巡航控制场景和交叉路口的红灯运行场景。实验结果表明，可以有效降低BSM和ESM的传输延迟，从而提高了车辆排的控制精度，弦稳定性和防撞性能。交叉路口的协作自适应巡航控制场景和红灯运行场景。实验结果表明，可以有效降低BSM和ESM的传输延迟，从而提高了车辆排的控制精度，弦稳定性和防撞性能。交叉路口的协作自适应巡航控制场景和红灯运行场景。实验结果表明，可以有效降低BSM和ESM的传输延迟，从而提高了车辆排的控制精度，弦稳定性和防撞性能。