Field Trials in 5G-Nr Aided Vehicle-Road-Cloud Integrated Systems: From the Perspective of Latency and Aoi

With the increase in the number of vehicles, vehicle-road-cloud integrated architecture is regarded as a key application of vehicle-to-everything (V2X) systems. The vehicle-road-cloud integrated architecture enables real-time communication of vehicle-to-vehicle, vehicle-to-infrastructure, vehicle-topedestrians, and vehicles-to-cloud, therefore significantly improving traffic efficiency. This paper constructs a field testing platform of vehicle-road-cloud integrated system, based on 5 G new radio (NR). We first introduce the deployment of test platforms for the vehicle, road, and cloud sides. Then, the data exchange procedure among the vehicle, road, and cloud sides is presented. Tailed for the time-sensitive requirement in NR-V2X applications, we propose a pre-scheduling design. Explicitly, the packets can be transmitted immediately, without the requirement of waiting for an uplink scheduling request (SR) slot. Finally, a comprehensive field trial is conducted to evaluate the latency and the age of information (Aol) performance, in peak and off-peak hours respectively. The testing result revealed that, the proposed prescheduling design can significantly reduce the end-to-end latency, and therefore also improve the AoI performance, guaranteeing the requirements of mission critical application in NR-V2X systems.