Supporting safety critical applications is at the core of car-to-car communication.
DSRC was developed to meet all V2X requirements. It is the incumbent V2X technology, with huge planned investments in infrastructure. Moreover, the USDOT is in the process of mandating DSRC in all new vehicles. Vehicles with DSRC-based V2X can be bought today from GM and Toyota, and Volkswagen announced a plan for mass-market deployment starting 2019.
Recently, C-V2X, a technology still in the making, is promoted by the cellular industry. No C-V2X products are available today, and are far from reaching the maturity and security levels needed for critical safety systems.
C-V2X introduction contradicts the notion of a large network of interoperable vehicles. Having a vehicle from one manufacturer not capable of communicating with a vehicle of another manufacturer is a major safety risk.
DSRC is more cost effective than C-V2X. C-V2X modem requires an expensive super accurate clock source and its receiver is more complex. Moreover, C-V2X needs to meet V2X cybersecurity standards and cannot share resources with LTE.
In addition, C-V2X struggles to meet the specific application requirements of car-to-car communication as detailed in the whitepaper, co-written by Autotalks and NXP: Download the full DSRC vs C-V2X comparison white paper.