Having the Fifth Generation (5G) mobile communication system recently rolled out in many countries, the wireless community is now setting its eyes on the next era of Sixth Generation (6G). Inheriting from 5G its focus on industrial use cases, 6G is envisaged to become the infrastructural backbone of future intelligent industry. Especially, a combination of 6G and the emerging technologies of Digital Twins (DT) will give impetus to the next evolution of Industry 4.0 (I4.0) systems. This article provides a survey in the research area of 6G-empowered industrial DT system. With a novel vision of 6G industrial DT ecosystem, this survey discusses the ambitions and potential applications of industrial DT in the 6G era, and identifies the emerging challenges as well as the key enabling technologies. The introduced ecosystem is supposed to bridge the gaps between humans, machines, and the data infrastructure, and therewith enable numerous novel application scenarios.

翻译：随着第五代（5G）移动通信系统近期在多个国家部署，无线通信领域已将目光投向下一代第六代（6G）时代。6G继承了5G对工业应用场景的聚焦，被设想为未来智能工业的基础设施支柱。特别是，6G与数字孪生（DT）这一新兴技术的结合，将推动工业4.0（I4.0）系统的下一次演进。本文对6G赋能的工业数字孪生系统研究领域进行了综述。基于6G工业数字孪生生态系统的新愿景，本文探讨了6G时代工业数字孪生的目标与潜在应用，并识别了新兴挑战及关键使能技术。所提出的生态系统旨在弥合人类、机器与数据基础设施之间的鸿沟，进而实现众多新型应用场景。