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US debate over V2X protocols reflects wider global split

The deadline has now passed for comment on US plans to mandate DSRC (dedicated short range communications) technology in vehicles to improve road safety. But the responses to the National Highway Traffic Safety Administration’s (NHTSA’s) proposals reveal the splits over standardization in the connected car arena. The cellular community wants to push Cellular-V2X, based on LTE-V, the specialized variant of LTE for vehicle-to-vehicle (V2V) and vehicle-to-everything (V2X) communications. But there is a divide between the cellular approach and the 802.11ap, WiFi-based alternative, which offers all the pros and cons of an unlicensed spectrum solution (deployable by non-spectrum owners, but at risk of unreliable performance). In the US, the situation is slightly different. DSRC is based on 802.11p but has its…

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