Though it often takes some time, spectrum licenses issued by the U.S. Federal Communications Commission essentially are on a “use it or lose it” basis, and so some valuable mid-band spectrum is about to shift from vehicular communications to unlicensed use to support indoor communications such as Wi-Fi as well as outdoor internet access operations.
For the past two decades, the 5.9 GHz band (5.850-5.925 GHz) has been reserved for use by Dedicated Short Range Communications (DSRC) for vehicle-to-vehicle communications. But DSRC service has not been widely deployed.
So the FCC has initiated a proceeding to reallocate 45 MHz of that spectrum for unlicensed applications. The Commission proposes to retain spectrum in the upper 30 megahertz of the 5.9 GHz band to meet current and future needs for transportation and vehicle safety-related communications, while repurposing the lower 45 megahertz of the band for unlicensed operations such as Wi-Fi.
Perhaps 20 MHz would remain allocated for DSRC, while 10 MHz is set aside for C-V2X.
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