In a joint project between Huawei and Rohde & Schwarz, a precision end-to-end delay measurement system for over-the-air IP transmissions was applied to 5G V2X communication for cooperative driving applications in field tests in a moving car.
A measurement accuracy below 2µs for each transmitted IP packet was demonstrated. The transmitted data contained various IP traffic streams including video, LIDAR and control data (ITS messages) for a tele-operated vehicle. The precision absolute time standards on both ends were derived from two independent GPS receivers.
While the trial in Munich was related to a tele-operated driving project, the tests in Shanghai were related to a platoon V2X testing site, where a number of vehicles traveling together are electronically connected via wireless communication. The delay for transmission of one IP packet from source over-the-air to a (moving) receiver (sink) needs to be measured, spanning all delays introduced by the radio transmitter, propagation delay and radio receiver from/to IP packet level.