A little-known conflict over the electromagnetic spectrum could shape self-driving cars for years to come. On one side is “an ecosystem of companies” that have developed vehicle-to-vehicle (V2V) communications systems and the National Highway Traffic Safety Commission (NHTSC), which wants to mandate such systems in all cars and trucks, which together want the Federal Communications Commission to dedicate the 5.9 gigahertz spectrum to such systems. On the other side are WiFi developers and advocates who would like to open parts of that spectrum to WiFi use.
The V2V people say that such systems are essential for improved auto safety and self-driving cars and don’t want to share the spectrum with millions of WiFi users. However, General Motors and Cisco have thrown a monkey wrench into their case with an announcement that they plan to test WiFi for V2V communications.
Volvo and other companies have already shown that WiFi alone can provide adequate V2V communications for platooning cars down a highway. In such platooning, a lead vehicle does the driving and numerous following vehicles, spaced as little as five meters apart, merely mimic the lead vehicle’s speed and direction. Such platooning would obviously greatly increase highway capacities.
