Evaluating the Impact of Numerology and Retransmission on 5G NR V2X Communication at A System-Level Simulation

In recent years, Vehicle-to-Everything (V2X) communication opens an ample amount of opportunities to increase the safety of drivers and passengers and improve traffic efficiency which enables direct communication between vehicles. The Third Generation Partnership Project (3GPP) has specified a 5G New Radio (NR) Sidelink (SL) PC5 interface for supporting Cellular V2X (C-V2X) communication in Release 16 in 2017. 5G NR V2X communication is expected to provide high reliability, extra-low latency, and a high data rate for vehicular networks. In this paper, the newly introduced features of 5G NR standards such as flexible numerology, variable Subcarrier Spacing (SCS), and allocated Physical Resource Blocks (PRBs) have been inspected in 5G NR V2X communications. Moreover, the 5G NR V2X data packet will be distributed to all nearby User Equipment (UE) by the Transmitter (Tx). However, there may be instances where certain UEs fail to receive the data packets in a single transmission. To meet the stringent reliability and latency requirements of C-V2X communication, we suggest and evaluate a retransmission scheme along with a scheme that incorporates varying resource allocations for retransmission in NR V2X communication. The effect of retransmission schemes on NR V2X communication systems has been detected. In the end, a system-level simulator complied with the 3GPP 5G NR SL standards, for NR V2X communication focusing on SL communication has been implemented, provides variable Medium Access Control Layer (MAC) configures, and the Packet Reception Ratio (PRR) has been used to represent the system-level performance for NR V2X communication. Furthermore, this paper includes a set of preliminary system-level simulation results on SL communication using the developed simulator.