A Testbed for Experimenting 5G-V2X Requiring Ultra Reliability and Low-Latency

The 5G ultra reliable and low-latency communication (uRLLC) will become a significant enhancement to the future assisted driving and fully autonomous driving. For experimenting various uRLLC-enabled cooperative driving applications, we have designed a Vehicle-to-everything (V2X) testbed based on the software defined radio (SDR), which features flexible reconfiguration in short frame structure and numerology, fast real-time processing, flexible synchronization and easy to deploy. The usecases and communication requirements for future cooperative autonomous driving are discussed to motivate the system design and technical enablers that can achieve the most stringent linklevel communication requirements of cooperative autonomous driving. The main building blocks of the testbed include a reconfigurable RF front-end and optimized base-band processing on general purposed CPUs. The technical enablers include a new OFDM-like waveform based on Pulse-shaping, a flexible and self-contained frame-structure design, GNSS-aided hybrid synchronization and low-latency scheduled multiple-access. We finally present some experimental results from lab measurements and field trial.