US DOT Spectrum Sharing Test Report: Effects of Unlicensed-National Information Infrastructure-3 (U-NII-3) Devices on Dedicated Short-Range Communications (DSRC)

Wednesday, April 15, 2020 - 13:30

This document reports the results of testing to characterize the existing radio frequency signal environment. Specifically, the USDOT’s test plan sought to identify the interference impacts to transportation’s 5.9 GHz Dedicated Short-Range Communications (DSRC) operations from today’s unlicensed Wi-Fi devices (known as unlicensed national information infrastructure devices operating in the third 5GHz band, or U-NII-3 devices) if they were to operate in the 5850-5925 MHz band and adjacent bands. In order to accomplish this work the USDOT developed the capability to evaluate proposed band sharing mechanisms via laboratory and field testing, noting that the ability to test wireless systems at full scale and high speed is challenging and unique. As per Congressional direction provided to the USDOT, the FCC, and the National Telecommunications and Information Administration (NTIA) in 2015, the results are intended to provide data to deployment scale modeling by NTIA and allow further collaboration with the FCC to provide Congress with factual information on the impacts to DSRC operations from unlicensed devices in the band. A planned follow-on Phase II will use the results of testing documented in this report to form a baseline for testing UNII-4 devices with sharing mechanisms proposed to mitigate these interference impacts. This report can be downloaded from the US DOT at


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