For the past several years, DSRC has been the only V2X technology available. After a long period of multiple large-scale field tests, DSRC based V2X went into production in the US and Japan in 2017, and is about to start mass production in Europe in 2019. Recently, C-V2X technology was introduced, having the same purpose of direct communication link between vehicles. C-V2X is defined by 3GPP based on cellular modem technology, leading to fundamentally different non-interoperable access layer with DSRC. Aside from that, the two technologies are addressing identical use-cases and having identical network, security and application layers.
While DSRC-based V2X is deployed in the US, Europe and Japan, C-V2X is gaining momentum in other regions.
The table highlights the commonalities and differences between the usability and general properties of DSRC and C-V2X. A more detailed technical comparison, can be found in the “Technical” tab.
DSRC and C-V2X are rooted from different technologies, leading to fundamentally different operational methods. DSRC, derived from WiFi, is optimized for cost and simplicity, and inherently supports distributed operation. C-V2X, derived from LTE, added new mechanisms to enable distributed operation (mode 4).
The comparison is multi-dimensional. The impact of every parameter should be analyzed according to the properties of V2V operation, as defined by the requirements of the V2V upper-layers and applications.
The following table summarizes the technical properties of DSRC and C-V2X technologies: