[20210421]IF11260_智能汽车和卡车：频谱用于车辆安全.pdf

https:/crsreports.congress.gov Updated April 21, 2021Smart Cars and Trucks: Spectrum Use for Vehicle SafetyA November 2020 decision by the Federal Communications Commission (FCC) to reconfigure the 5.9 gigahertz (GHz) spectrum band may change the evolution of U.S. vehicle safety technologies. The decision has implications for domestic spectrum use and vehicle technologiesand their application to international standards for connected vehicles and infrastructure. The 5.9 GHz band was previously allocated for intelligent transportation systems (ITS)specifically, for Dedicated Short Range Communications (DSRC) vehicle safety technologies. The FCC split the band, allocating a part to unlicensed use (e.g., Wi-Fi) and reducing the portion available to ITS vehicle safety technology by more than half. The commission assigned that portion exclusively to Cellular Vehicle-to-Everything (C-V2X), which it selected as the U.S. standard for vehicle safety technologies. It eliminated spectrum for DSRC use altogether. The U.S. Department of Transportation (DOT) opposes this decision. DOT has been funding, testing, and piloting DSRC for more than 20 years, and it says the technology is capable of cu