United States Department of Transportation
i
5.9GHz Interference Resiliency for Connected Vehicle Equipment
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2023-11-01
[PDF-2.62 MB]
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Edition:Final Report (December 2022 – December 2023)
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Abstract:There are new Wi-Fi channels in the 5.9GHz Dedicated Short Communications Band in the United States which once was licensed spectrum exclusively for IEEE 802.11p connected vehicle devices. Existing literature reports through simulations and modelling that unlicensed interference from low-cost Wi-Fi devices could degrade the quality of IEEE 802.11p communications. Furthermore, the introduction of Wi-Fi 6e has presented an additional form of interference to C-V2X technology. To date it has been challenging to perform unlicensed interference experimentation at scale due to the lack of low-cost Wi-Fi devices that can transmit in the new 5.9GHz Wi-Fi channels and Wi-fi 6e channels. With this work we report the actual interference effects using 25 real low-cost devices which have been modified to operate in the new 5.9GHz Wi-Fi channels and Wi-fi 6e channels and report the effects on commercial DSRC and C-V2X devices. Experimental observations both in lab and in the field show that infrastructure to vehicle messages have a higher likelihood of reception than vehicle to infrastructure messages during adjacent channel interference activity.
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