C-V2X (Cellular Vehicle-to-Everything) is the 3GPP family of cellular-based technologies used for V2X communication, including direct PC5 links and network-based Uu links.
How C-V2X works
C-V2X is not simply “a car connected to 5G.” It includes two complementary paths. PC5 supports direct communication between nearby devices, while Uu uses the cellular network. A safety application can therefore use local direct messages, network information, or both.
5GAA’s 2026 work on dynamic V2X specifically studies PC5 and Uu working together in non-line-of-sight and other complex road situations.
PC5 vs Uu
| Path | Connection | Typical role |
|---|---|---|
| PC5 | Direct device-to-device | Nearby vehicles, roadside equipment or compatible road-user devices exchange information without routing the message through the network. |
| Uu | Vehicle ↔ mobile network | Cloud, backend and wider-area information exchange, including V2N and network-assisted V2X applications. |
LTE-V2X vs 5G / NR-V2X
3GPP standardized early cellular V2X capabilities in the LTE era and later added New Radio V2X capabilities for more demanding use cases. This is why the terms LTE-V2X, 5G-V2X and NR-V2X can all appear in connected-vehicle discussions.
NR-V2X should not be treated as a simple marketing synonym for all C-V2X. C-V2X is the broader family.
Why C-V2X matters
C-V2X can extend a vehicle’s awareness beyond what its onboard sensors can see. Potential applications include intersection warnings, traffic-signal information, road-hazard messages, vulnerable-road-user awareness and cooperative driving. Its usefulness depends on deployment coverage, interoperability, security and trustworthy data.
Related terms
Sources
- 5GAA — C-V2X explained
- 5GAA — Study on Dynamic V2X Use Cases (2026)
- 3GPP portal — V2X specifications
Automotive terminology evolves quickly. We separate established standards from manufacturer-specific names and update pages as technologies move into production.