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posted by martyb on Wednesday October 31 2018, @05:44PM   Printer-friendly
from the waiting-for-them-to-push-it-to-11...GHz dept.

El Reg:

A mostly-unused slice of radio spectrum set aside for connected cars in 1999 could soon be shared with Wi-Fi, with the Federal Communications Commission seeking comment on the future of the 5.9 GHz band.

On Monday, the FCC presented the results of tests conducted by Cisco, Qualcomm, KEA Tech, Broadcom, and CAV technologies to see how well Wi-Fi devices (in regulatory-speak "unlicensed national infrastructure", U-NII, devices) can share spectrum with Dedicated Short Range Communications (DSRC) systems for the Intelligent Transportation Service (ITS).

Since vendors have worked for years learning how to "play nice" with other spectrum – for example, in the "LTE unlicensed versus Wi-Fi" debate resolved last year – it should come as no surprise to learn that Wi-Fi kit can obey "detect and vacate" rules in the 5.9 GHz band.

The tweets must flow...


Original Submission

 
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  • (Score: 0) by Anonymous Coward on Thursday November 01 2018, @12:59AM (1 child)

    by Anonymous Coward on Thursday November 01 2018, @12:59AM (#756271)

    Human reaction times are about a half second, assuming you are paying attention, elite athletes are often quicker. I'm not interested in any "average" reaction time for drivers, I want automatic systems to be at least as good as me (my demographic). Since I don't drive drunk, don't have a cell phone in the car and have some advanced driver training experience that sets the bar fairly high for automated driving systems.

  • (Score: 2) by takyon on Thursday November 01 2018, @01:14AM

    by takyon (881) <reversethis-{gro ... s} {ta} {noykat}> on Thursday November 01 2018, @01:14AM (#756274) Journal

    Driverless cars should not really need vehicle-to-vehicle (V2V) communication if they are done right. A human driver is not wirelessly connecting to other cars with his brain. At most, a driver may communicate with hand signals or by flipping the bird once in a while, and a driverless system could be able to recognize visual signals. Wirelessly connecting to nearby cars is just begging for security holes or malicious communications intended to trick the other car.

    Therefore any "channel-move time" or other Wi-Fi related latency is just irrelevant. I expect driverless cars will be able to react to situations in well under 100 milliseconds, if done right (for the counterexample, see Uber). If a car starts reacting to an unexpected obstacle within 50 ms, vs. 500 ms for humans, then it can decelerate sooner than a human could, and provide a higher survival rate. Because slowing down the car ASAP is the most important thing. I guess it would be cool for the car to attempt to dodge or drift within the available space, like it is a pro driver, but slowing down is practical and will almost always be the correct response.

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