The third generation partnership project (3GPP) has issued specifications for the autonomous assignment of radio resources by vehicles on the sidelink of the cellular-vehicle-to-everything (C-V2X) technology. It is based on a sensing mechanism for resource selection and a semi-persistent scheduling for resource reservation to periodic safety messages. Imperfect sensing due to hidden terminals and to half-duplex on board transceivers may result in the selection of interfered resources for successive message transmissions. As a consequence of the lost packets, involved vehicles may become blind to the presence of other vehicles in their vicinity even for many seconds, with threats to the road safety. In this paper, we define these events as wireless blind spots (WBSs) and characterize their probability to occur. We propose an enhancement to the autonomous mode in order to reduce the WBS duration and demonstrate the benefits of the proposal against the legacy mode, both analytically in a simplified scenario and through simulations in a highway environment.

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关于 C-V2X Sidelink 中的无线盲点

第三代合作伙伴计划 (3GPP) 发布了车辆在蜂窝车联网 (C-V2X) 技术侧链上自主分配无线电资源的规范。它基于资源选择的感知机制和对周期性安全消息的资源预留的半持久调度。由于隐藏终端和板载收发器的半双工而导致的不完美感测可能导致为连续的消息传输选择受干扰的资源。由于数据包丢失，相关车辆可能会在几秒钟内对附近其他车辆的存在视而不见，从而威胁道路安全。在本文中，我们将这些事件定义为无线盲点 (WBS) 并表征它们发生的概率。