基于C-V2X技术的车载终端设计与验证

Design and Verification of the C-V2X-based Onboard Terminal

针对V2X(Vehicle-to-Everything)车载终端需要满足高速行驶车辆低延迟、高速率和高可靠性的通信需求,开展基于C-V2X技术的车载终端设计与验证。该终端采用DMD31芯片与主副处理器相结合的设计、主天线和分集天线的增益设计以及全新的任务调度与数据交互设计,研究了该终端硬件系统与软件系统的结构和主要功能,分别在静态场景和动态场景下对该终端的性能进行了测试。结果表明:该终端在200 m内的通信时延低于19.7 ms,丢包率低于0.03%;与现有基于专用短程通信技术设计的车载终端相比,平均通信时延降低了0.4 ms,通信距离大于100 m后丢包率降低了1.8%。该终端的通信性能满足3GPP TS 36.521 Release15标准规范,可用于构建各类车路协同应用。

To meet communication requirements of vehicles running at high speed such as low latency,high rate,and high reliability,an onboard terminal was designed based on C-V2X technology and verified.A combined design of DMD31 chip and main and sub processors,a gain design of main antenna and diversity antenna,and a new task scheduling and data interaction de-sign were introduced to study the structures and main functions of the hardware system and the software system of the proposed terminal specifically.Furthermore,the performance of the pro-posed terminal was verified in static scenes and dynamic scenes.Results showed that,within 200 m,the communication delay of of the proposed terminal is less than 19.7 ms and the packet loss rate is less than 0.03%.Compared to DSRC-based onboard terminals,the average communica-tion delay is reduced by 0.4 ms,and the packet loss rate is reduced by 1.8%beyond 100 m.The communication performance of the proposed onboard terminal meets the 3GPP TS 36.521 Re-lease 15 standard specification.Based on the terminal,various vehicle-road collaborative applica-tions can be constructed.