Witnessing the recent rapid 5G commercialization with multiple advantages in terms of high throughput, low latency, great serviceability, and extreme density, people look forward to seeing a new innovation in the next-generation mobile networks–6G. As a demand response, 6G additionally integrates artificial intelligence into all operational perspectives of the network while incorporating new infrastructure to support service coverability to yet underserved areas. Since the artificial intelligence in 6G has been discussed significantly in the literature, this article, on the other hand, provides major insights of the 6G aerial radio access network (ARAN) as an expansion of mobile coverage from the sky. First, we highlight the distinct attributes of ARAN by constructing a comparative taxonomy among mobile access infrastructures. Consequently, comprehensive ARAN architecture, reference model, and potential technologies are analyzed. Next, current research trends are investigated followed by future challenge discussions.

中文翻译：

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天空是边缘—从天空走向移动覆盖

目睹了近期快速的5G商业化，并在高吞吐量，低延迟，出色的可维护性以及极高的密度方面具有多种优势，人们期待着下一代移动网络6G的一项新创新。作为需求响应，6G还将人工智能集成到网络的所有运营视角中，同时并入了新的基础架构，以支持尚未得到服务的区域的服务覆盖范围。由于在文献中对6G的人工智能进行了重要讨论，因此，另一方面，本文提供了6G空中无线电接入网（ARAN）的重​​要见解，可以扩展从空中的移动覆盖范围。首先，我们通过在移动访问基础设施之间构建比较分类法来突出显示ARAN的独特属性。最后，分析了全面的ARAN架构，参考模型和潜在技术。接下来，调查当前的研究趋势，然后讨论未来的挑战。