5G has been designed to support applications such as connected and automated driving. To this aim, 5G includes a highly flexible New Radio (NR) interface that can be configured to utilize different subcarrier spacings (SCS), slot durations, scheduling, and retransmissions mechanisms. This flexibility can be exploited to support advanced V2X services with strict latency and reliability requirements using V2N2V (Vehicle-to-Network-to-Vehicles) communications instead of direct or sidelink V2V (Vehicle-to-Vehicle). To analyze this possibility, this paper presents a novel analytical model that estimates the latency of 5G at the radio network level. The model accounts for the use of different numerologies (SCS, slot durations and Cyclic Prefixes), modulation and coding schemes, full-slots or mini-slots, semi-static and dynamic scheduling, different retransmission mechanisms, and broadcast/multicast or unicast transmissions. The model has been used to first analyze the impact of different 5G NR radio configurations on the latency. We then identify which radio configurations and scenarios can 5G NR satisfy the latency and reliability requirements of V2X services using V2N2V communications. This paper considers cooperative lane changes as a case study. The results show that 5G can support advanced V2X services at the radio network level using V2N2V communications under certain conditions that depend on the radio configuration, bandwidth, service requirements and cell traffic load.
翻译:5G设计是为了支持连接和自动化驾驶等应用程序。为此,5G包括一个高度灵活的新无线电(NR)接口,可以配置用于使用不同的子机间距(SSCS)、空档时间、时间安排和再传输机制。这种灵活性可用于支持先进的V2X服务,使用V2N2V2(VIC-Network-to-Vehicles)通信而不是直接或侧链接V2V2(VIC-VE-VEB),而不是直接或侧链接V2(VIC-VE)。为分析这一可能性,本文件提出了一个新的分析模型,用以估计无线电网络一级5G的延迟时间间隔。使用不同的数字(SSCS、空档时间和Cyclic Prefixes)、调制和调制和调控系统、半静电和动态调度、不同的再传输机制,以及广播/多播或单播的传输。模型首先用来分析5GNR2的通信水平影响,我们用VX的频率和某些无线电配置在5GR2的状态下可以显示对5VX的频率的频率和运行要求。