Distributed V2X Sidelink Communications With Receiver Grant MAC Design
Distributed V2X Sidelink Communications With Receiver Grant MAC Design
复制标题
采用接收器 Grant MAC 设计的分布式 V2X 侧链路通信
DOI：
10.1109/tvt.2022.3153816
复制
发表时间：
2022
影响因子：
6.8
通讯作者：
Hung
中科院分区：
文献类型：
--
作者：
Wen;Hung
随着新的无线电(NR)技术的发展，旁路(SL)传输在支持低延迟、高可靠性的车辆到一切(V2X)通信方面发挥着越来越重要的作用。与长期演进(LTE)相比，NR V2X旨在支持具有更严格的延迟和可靠性要求的增强型V2X用例。3GPP引入了NR V2X分布式资源分配，以满足低时延要求，以减少向GNB请求传输资源所造成的时延。在分布式模式下，UE自主选择资源，而无需来自GNB的调度。NR V2X引入了物理侧链路反馈信道(PSFCH)，以增强传输可靠性。提出了NRV2X分布式模式下的资源分配机制。由于SL反馈信道是不同于LTE V2X的新特性，我们讨论了利用SL反馈信道在资源分配上的潜在增强以提高可靠性。本文提出了一种基于接收端授权的资源分配方法，允许接收端通过反馈信道发送授权。通过允许发射机在先前预留结束之前指示预选资源，接收机可以通过PSFCH将冲突的资源选择通知给发射机。文中还给出了反馈信道下NR V2X分布模式的解析模型，以供UE估计碰撞比。仿真结果和分析模型表明，所提出的基于接收方(Rx)授权的资源分配在冲突比方面提高了传输的可靠性。对于未来的高级V2X用例，分析模型提供了一种评估方法，并帮助UE做出决策，以满足可靠性要求。
With the development of new radio (NR) technologies, sidelink (SL) transmission plays a more vital role in supporting low latency, higher reliability vehicle-to-everything (V2X) communications. Compared with the Long-Term Evolution (LTE), NR V2X aims to support enhanced V2X use cases with more stringent latency and reliability requirements. 3GPP introduces NR V2X distributed resource allocation to fulfill the low latency requirement to reduce the delay caused by requesting transmission resources from gNB. In distributed mode, UEs autonomously select resources without the scheduling from gNB. NR V2X introduces the physical sidelink feedback channel (PSFCH) to enhance transmission reliability. This paper presents the resource allocation mechanism for NR V2X distributed mode. Since the SL feedback channel is a new feature different from LTE V2X, we discuss the potential enhancements on resource allocation utilizing SL feedback channel to improve the reliability. This paper proposes a Receiver Grant-based resource allocation, which allows the receiver to send the grant with the feedback channel. By allowing the transmitter to indicate the pre-selected resources before the end of the previous reservation, the receiver can inform the transmitter about the collided resource selection through the PSFCH. The analytical models for NR V2X distributed mode with the feedback channel are also provided for UE to estimate the collision ratio. The simulation results and the analytical model show that the proposed Receiver (Rx) Grant-based resource allocation improves transmission reliability in terms of collision ratio. For future advanced V2X use cases, the analytical models provide an evaluation method and help UE make decisions to meet the reliability requirements.