Vehicle-to-Everything (V2X) communication is a wireless technology framework enabling vehicles to exchange information with surrounding entities, including other vehicles (V2V), roadway infrastructure (V2I), pedestrians and cyclists (V2P), and network services (V2N). V2X extends vehicle awareness beyond onboard sensors, supporting enhanced safety systems, traffic efficiency applications, and the progression toward fully autonomous driving.
V2X encompasses several specific communication modes. Vehicle-to-Vehicle (V2V) allows direct exchange of position, speed, heading, and hazard information between nearby vehicles, enabling cooperative awareness and collision avoidance beyond line-of-sight. Vehicle-to-Infrastructure (V2I) connects vehicles with traffic signals, roadside units, and highway systems for applications like signal phase timing optimization and work zone warnings. Vehicle-to-Pedestrian (V2P) alerts drivers to vulnerable road users and warns pedestrians of approaching vehicles. Vehicle-to-Network (V2N) provides cloud connectivity for traffic information, map updates, and remote services.
Two primary technology stacks implement V2X communication. DSRC (Dedicated Short-Range Communications) based on IEEE 802.11p provides direct communication without cellular network dependence, well-suited for safety-critical low-latency applications. C-V2X (Cellular V2X) uses LTE and 5G cellular technology, offering both direct communication (PC5 interface) and network-based communication (Uu interface), with a roadmap toward 5G advanced capabilities. Both technologies continue to evolve and coexist in different deployment contexts.
Precise GNSS positioning is essential for effective V2X applications. Position data shared between vehicles must be accurate enough to determine lane-level locations and relative trajectories. Infrastructure applications require precise geofencing and location-aware messaging. Autonomous vehicle applications combining V2X with onboard perception depend on consistent, accurate positioning across all participating vehicles. As V2X deployments expand, the integration of centimeter-level GNSS positioning with vehicle communication systems becomes increasingly critical for realizing full safety and autonomy benefits.
