5G Connected Vehicles (NR-V2X)

NR-V2X (New Radio Vehicle-to-Everything), also known as 5G-V2X, is a next-generation cellular V2X communication standard developed on 5G New Radio technology. Built upon the foundational safety broadcasting capabilities of LTE-V2X (4G V2X), it is engineered specifically for Cooperative Automated Driving. By introducing advanced communication modes such as unicast and groupcast, it enables precise one-to-one and one-to-many collaboration between vehicles. While LTE-V2X functions like a public broadcast radio where vehicles merely announce their presence, NR-V2X enables point-to-point calling and real-time negotiation between vehicles, providing a vital communication backbone for high-level autonomous driving.

Key Differences from LTE-V2X

LTE-V2X primarily addresses situational awareness—broadcasting data so surrounding vehicles know each other's location and speed to support basic safety functions like collision warnings. NR-V2X, on the other hand, is built for active coordination—it not only lets vehicles know where others are, but also allows them to negotiate driving manoeuvres. The fundamental distinctions lie in their communication modes and performance benchmarks.

Upgraded Communication Modes: LTE-V2X supports only broadcast mode, where data is transmitted unidirectionally without specific recipients. NR-V2X builds on this by adding unicast and groupcast modes. Unicast provides reliable two-way communication between two specific vehicles, laying the groundwork for synchronised commands in vehicle platooning. Groupcast allows data to be shared simultaneously with a targeted group of vehicles within a designated area, making it ideal for cooperative lane changes.

Significant Performance Leap: Tailored to the stringent requirements of autonomous driving, NR-V2X delivers a massive upgrade across key communication metrics:

Furthermore, NR-V2X tightens positioning accuracy to within 0.1 metres laterally and 0.5 metres longitudinally, enabling lane-level cooperative control.

Technical Architecture: Synergy Between PC5 Sidelink and 5G Uu

NR-V2X retains the dual-mode communication architecture of C-V2X, with both interfaces comprehensively upgraded using 5G technology:

PC5 Direct Interface (Sidelink): This serves as the core direct link for V2V and V2I communication, bypassing cellular base stations to eliminate signalling latency. NR-V2X redesigns the sidelink physical layer to include unicast/groupcast HARQ feedback mechanisms, higher-order modulation (up to 256-QAM), and more flexible synchronisation protocols. According to the 5G Automotive Association (5GAA), a multi-vendor interoperability profile (5G-V2X Profile) based on NR-V2X PC5 Mode 2 reached the stable draft stage under ETSI in 2026, delivering standardised technical specifications for cross-brand direct V2X communication.

5G Uu Network Interface: This handles Vehicle-to-Network (V2N) communication via commercial 5G cellular networks, supporting high-definition map downloads, real-time traffic updates, and remote driving operations. Unlike earlier LTE setups, 5G Uu incorporates Ultra-Reliable Low-Latency Communication (URLLC). However, industry experts note that URLLC over base stations is suited mainly for fixed-endpoint scenarios (such as remote vehicle takeover), whereas dynamic, on-the-fly communication between moving vehicles still relies on the PC5 direct sidelink.

Key Application Scenarios

The advanced technical capabilities of NR-V2X make it capable of supporting various Level 3 and higher autonomous driving use cases:

• Vehicle Platooning: The lead vehicle sends acceleration, braking, and steering instructions to trailing vehicles via unicast communication. This allows the convoy to travel closely together, cutting aerodynamic drag and fuel consumption. Pilot trials in Liuzhou, Guangxi showed that platooning reduced vehicle following distances by 30% and cut fuel consumption by 8%.

• Cooperative Perception (Sensor Sharing): Vehicles share onboard sensor feeds (cameras, radar, LiDAR) in real time with nearby vehicles, combining multiple visual perspectives to eliminate blind spots and overcome visual obstructions.

• Cooperative Manoeuvres: Vehicles negotiate driving manoeuvres such as lane merging and junction navigation via unicast communication. For instance, when merging from an on-ramp, highway traffic and merging vehicles can negotiate gaps seamlessly to prevent collisions.

Industry Outlook and Development

The standardisation of NR-V2X was finalised in July 2020 with the freezing of 3GPP Release 16. Since then, commercial deployment has gained traction: chipmakers such as Qualcomm and Huawei have built Rel-16 NR-V2X support into their C-V2X chipsets; network operators like China Mobile are expanding 5G+V2X rollouts, with pilot zones such as Liuzhou upgrading over 200 smart junctions and keeping end-to-end latency below 20 milliseconds.

With upcoming 3GPP releases (Rel-17/18), NR-V2X is set to integrate Non-Terrestrial Networks (NTN, including satellite communication), paving the way for a unified space-air-ground-sea connected vehicle ecosystem in the 6G era.

Important Note: NR-V2X currently functions as a cooperative perception and communication technology that extends a vehicle's sensing range beyond the line of sight. However, its effectiveness depends heavily on device adoption rates and roadside infrastructure coverage. Drivers must remain attentive to road conditions at all times and cannot rely solely on V2X systems, retaining full responsibility for vehicle safety.