Multi-layer QoS Analysis of IEEE 802.11bd Based VANET for Safety Applications

The safety-critical applications of Vehicular Ad Hoc Networks (VANETs) call for wireless communication systems with high reliability and low transmission latency. Recently, a very promising communication system standardized as IEEE 802.11 bd was proposed and studied to address the reliability deficiency of IEEE 802.11 P based Dedicated Short Range Communications (DSRC) system in the adverse vehicular situations. Seamless evolution of radio access technology from IEEE 802.11p to IEEE 802.11bd have undergone performance improvement evaluations in the physical layer. However, the impact of the enhancements on the network layer and safety services in V ANETs remain unknown. In this paper, we conduct analysis of IEEE 802.11bd beyond the physical layer. First, the performance gains of IEEE 802.11bd comparing to IEEE 802.11p in the physical layer are summarized. Then, packet loss rate (PLR) curves as a function of signal-to-noise ratio (SNR) in the physical layer are quantified and connected to the quality of service (QoS) metrics in the MAC layer, while considering the effect of channel access and interference among network nodes. Furthermore, application-level analysis is conducted to identify if the proposed IEEE 802.11bd can meet the QoS requirements of the selected safety applications where IEEE 802.11p previously failed. Finally, constructive conclusions are presented on IEEE 802.11bd's suitability for V ANET critical safety services and future developments.