Integrated Sensing and Communications (ISAC) for Vehicular Communication Networks (VCN)
Integrated Sensing and Communications (ISAC) for Vehicular Communication Networks (VCN)
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DOI：
10.1109/jiot.2022.3191386
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发表时间：
2022-12-01
影响因子：
10.6
通讯作者：
Yang, Liuqing
中科院分区：
文献类型：
--
作者：
Cheng, Xiang;Duan, Dongliang;Yang, Liuqing
随着智能车辆和配备无线连接的路边装置的空前发展，交通系统在过去的一二十年里正在发生革命性的变化。以安全和效率为最高目标，车载传感器和交通基础设施中各种传感器的数量呈爆炸式增长。一方面，这些传感器注定要无线连接，为交通运输提供更全面的态势感知。另一方面，环境中丰富的传感器数据可以潜在地揭示处于任何通信系统设计核心的信道传播特性。因此，集成传感与通信（ISACs）在车载通信网络（VCN）中是必要的和自然的。与现有的ISAC针对通用环境但仅限于双功能雷达通信（DFRC）的工作不同，在本文中，我们将重点放在交通场景和应用上，但从整体上看待ISAC的可能性。首先，我们认为，尽管交通环境中的许多传感器是基于非射频（RF）的，但在以通信为中心（CC）或以传感为中心（SC）模式下，功能性ISAC （fISAC）是可行和必要的。为了促进这一点，联觉的概念被引入ISAC，以适应RF和非RF格式的“机器感官”。然后，我们放大到基于射频的传感器，并提出了所谓的信号ISAC (sISAC)，采用统一硬件（UH）或分离硬件（SH）平台，并描述了运输环境中出现的独特问题。包括几个具体的运输案例研究，以展示这些不同的ISAC制度。最后，讨论了这些ISAC子类别之间的关系，并给出了路线图。
With the unprecedented development of smart vehicles and roadside units equipped with wireless connectivity, the transportation system is undergoing revolutionary changes in the past decade or two. Bearing safety and efficiency as the utmost objectives, the vehicular environments are witnessing explosive increase of various sensors onboard vehicles and equipped at transportation infrastructures. On the one hand, these sensors are destined to be wirelessly connected to provide more comprehensive situational awareness for transportation purposes. On the other hand, the abundance of sensor data of the environment can potentially shed light on the channel propagation characteristics that lie at the core of any communications system design. The integrated sensing and communications (ISACs) is henceforth both necessary and natural in vehicular communications networks (VCN). Different from existing ISAC works that target generic environments but are limited to dual-function radar-communications (DFRC), in this article we focus on transportation scenarios and applications but take a wholistic view of ISAC possibilities. First, we argue that, even though many sensors in transportation settings are nonradio-frequency (RF)based, functional ISAC (fISAC) is feasible and necessary, in both communication-centric (CC) or sensing-centric (SC) modes. To facilitate this, the concept of synesthesia is introduced to ISAC to accommodate "machine senses" in the RF and non-RF formats. We then zoom in to RF-based sensors and propose the so-termed signaling ISAC (sISAC), with either unified-hardware (UH) or separate-hardware (SH) platforms, and delineate the unique issues arising in transportation settings. Several transportationspecific case studies are included to demonstrate these various ISAC regimes. Toward the end, the relationships of these ISAC subcategories are discussed with a roadmap laid out.