Vehicular communication plays an important role in cooperative perception. 3GPP has successively standardized LTE-V2X and NR-V2X to support different kinds of vehicular communications, especially local information dissemination among vehicles by broadcast. There is no feedback for broadcast transmission. Therefore, blind retransmission usually is used to improve system reliability. But its effect is limited in the non-line-of-sight (NLOS) scenario. In this paper, with NR-V2X mode 2 as an example, we study how to improve the reliability of local broadcast transmission by using relay, from two aspects. (i) A vehicle allocates resources for the retransmissions at a relay vehicle in advance to reduce the delay. (ii) A relay vehicle is selected to help multiple vehicles simultaneously, considering the link quality between vehicles. Simulation evaluations confirm that using relay helps to improve information dissemination at the NLOS intersections, even when there is no vehicle at the intersection center.
Reliable NR-V2X Broadcast Transmission by Relay
2023-10-10
1373629 byte
Conference paper
Electronic Resource
English