DSRC Performance under the Adjacent Channel Interference of Cellular-Based V2X at 5.9GHz Band

Intelligent Transportation Systems (ITS) are faced with two Vehicle-to-Everything (V2X) communication technologies, Dedicated Short Range Communication (DSRC) and Cellular Vehicle-to-Everything (C-V2X). These technologies use different physical layer as well as MAC layer, hence are not compatible. They use the same 5.9GHz frequency band, but they may be allocated different channels. Such co-existence of the two system raises questions of possible adjacent channel interference from one technology to another when they are both adopted in the same country. In order to investigate this issue, we carry out an evaluation of the performance of DSRC under the effect of adjacent channel interference from C-V2X signal. Commercial off-the-shelf V2X devices are used. Line-of-sight (LOS) and Non-LOS (NLOS) measurements are made on the road. The on-road field measurement results show that, when C-V2X interference with high Channel Busy Ratio (CBR) of around 55% is present, the Packet Delivery Ratio (PDR) of DSRC system may drop from 100% to 90% in line-of-sight (LOS) scenarios, and the communication range may be reduced by up to 60m in the NLOS scenarios.