Abstract: NRV2Xis one of key future 5GR16 commercial applications.NRV2Xstandardization program has been set up in 3GPPR16, focusing on the specification of SLinterface to fulfill the stringent requirements of advancedV2Xapplications on latency, transmission rate, reliability, etc. Compared to the LTE V2X which simply works in the broadcast manner, NR V2X will adopt a number of new features which include unicast and groupcast transmission, SL-BWP, HARQ feedback, CSI measurement and report, NR and LTE devices scheduled by both NR gNB and LTE eNB, SL synchronization based SSB,according to the application scenarios.As a consequense, NR SL shall introduce new designs on the technologies of physical layer structure, transmission procedures, resource allocation, synchronization mechanism and coexistence of NR and LTE devices. In this paper, we make analyses on the developments of key technologies in the physical layer of NR V2X in the current standardization process, and advicesonthe follow-up improvements are put forward accordingly.

Key words: NR, V2X, sideLink, physical layer