C-V2X (LTE-V2X) Performance Enhancement Through SAE J3161/1 Probabilistic One-Shot Transmissions

This paper presents an in-depth performance comparison between several C-V2X (LTE-V2X) configurations in congested highway scenarios in 10 MHz and 20 MHz channels. Specifically, we focus on the inter-packet gap (IPG) performance, which is a key metric used in several V2X related studies. IPG measures the delay between two successfully received transmissions from a particular device. The results show that significant performance gains in terms of IPG can be achieved using the probabilistic one-shot transmission mechanism specified in SAE J3161/1 standard, which dictates that vehicles randomly skip their reserved Semi-Persistent Scheduling (SPS) transmissions and send one-shot transmissions instead. Furthermore, we conclude that this IPG gain with J3161/1 probabilistic one-shot transmissions can be achieved without any significant impact in terms of packet reception rate (PRR) performance.