5G V2X关键技术及标准进展

NRV2X是5GR16商用的一个重要应用场景。3GPP成立NRV2X标准项目,将在新空口上制定边链路接口的相关标准,满足在时延、传输速率、可靠性等方面要求更高的增强V2X应用服务。相比以广播传输为主的LTE-V2X,NR-V2X结合业务需求和NR空口特性将引入单播和组播传输、SL-BWP、HARQ反馈、CSI测量上报、NR/LTE基站调度NR-V/LTE-V、基于SSB的SL同步等新技术特性,并对物理层架构设计、传输过程、资源分配、同步机制以及NR与LTE设备共存等关键技术展开全新设计。本文结合标准最新进展,对NR-V2X中物理层关键技术进行分析讨论,并对后续技术的发展与标准化方向提出建议。

Research on key technologies and standardization of 5G V2X

NR V2 X is one of key future 5 G R16 commercial applications.NR V2 X standardization program has been set up in3 GPP R16,focusing on the specification of SL interface to fulfill the stringent requirements of advanced V2 X applications on latency,transmission rate,reliability,etc.Compared to the LTE V2 X which simply works in the broadcast manner,NR V2 X 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 V2 X in the current standardization process,and advices on the follow-up improvements are put forward accordingly.