With the recent developments of communication technologies surrounding vehicles, we witness the simultaneous availability of multiple onboard communication interfaces on vehicles. While most of the current interfaces already include Bluetooth, WiFi, and LTE, they are augmented further by IEEE 802.11p and the 5G interfaces, which will serve for safety, maintenance, and infotainment applications. However, dynamic management of interfaces depending on application becomes a significant issue that can be best addressed by Software Defined Networking (SDN) capabilities. While SDN-based vehicular networks have been promoted previously, none of these works deal with practical challenges. In this paper, we propose and develop a practical framework that realizes SDN-based vehicular networks for a wide range of applications. Through this framework, we demonstrate a truck platooning application as a use case in which the two truck platoons strive to merge and establish connectivity. The route from source vehicle (i.e., Platoon Leader A) to destination (i.e., Platoon Leader B) is computed with the help of the SDN Controller to transmit the Beacon Safety Messages through Road Side Units (RSUs) at the MAC layer without relying on IP for proper platooning operations. The results show the efficiency of the SDN-based approach compared to the traditional routing approaches.

随着车辆周围通信技术的最新发展，我们见证了车辆上多个车载通信接口的同时可用性。虽然大多数当前接口已经包括蓝牙、WiFi 和 LTE，但 IEEE 802.11p 和 5G 接口进一步增强了它们，这些接口将用于安全、维护和信息娱乐应用。然而，根据应用程序动态管理接口成为一个重要问题，软件定义网络 (SDN) 功能可以很好地解决这个问题。虽然之前已经推广了基于 SDN 的车辆网络，但这些工作都没有解决实际挑战。在本文中，我们提出并开发了一个实用框架，可实现基于 SDN 的车载网络，适用于广泛的应用。通过这个框架，我们演示了一个卡车队列应用程序作为一个用例，其中两个卡车队列努力合并并建立连接。从源车辆（即排长 A）到目的地（即排长 B）的路线是在 SDN 控制器的帮助下计算的，以通过 MAC 层的路边单元（RSU）传输信标安全消息，而不依赖于用于正确编队操作的 IP。结果显示了与传统路由方法相比，基于 SDN 的方法的效率。排长 B) 在 SDN 控制器的帮助下计算，以通过 MAC 层的路边单元 (RSU) 传输信标安全消息，而无需依赖 IP 进行适当的编队操作。结果显示了与传统路由方法相比，基于 SDN 的方法的效率。排长 B) 在 SDN 控制器的帮助下计算，以通过 MAC 层的路边单元 (RSU) 传输信标安全消息，而无需依赖 IP 进行适当的编队操作。结果显示了与传统路由方法相比，基于 SDN 的方法的效率。