Spanning 7-24 GHz, frequency range 3 (FR3), is a key enabler for next-generation wireless networks by bridging the coverage of sub-6 GHz and the capacity of millimeter-wave bands. Its unique propagation characteristics, such as extended near-field regions and spatially nonstationary fading, enable new transmission strategies. This article explores the potential of FR3 for integrated sensing and communication (ISAC), which unifies wireless communication and environmental sensing. We show that FR3's bandwidth and multiple-input multiple-output (MIMO) capabilities enable high-resolution sensing, multi-target tracking, and fast data transmission. We emphasize the importance of ultra-massive MIMO with extremely large aperture arrays (ELAAs) and the need for unified near-field and far-field channel models to support efficient ISAC. Finally, we outline challenges and future research directions for ELAA-based ISAC in 6G FR3.

翻译：频率范围3（FR3）覆盖7-24 GHz频段，通过桥接6 GHz以下频段的覆盖范围和毫米波频段的容量，成为下一代无线网络的关键使能技术。其独特的传播特性（如扩展的近场区域和空间非平稳衰落）为实现新型传输策略提供了可能。本文探讨了FR3在集成感知与通信（ISAC）中的应用潜力，该技术将无线通信与环境感知相统一。研究表明，FR3的带宽与多输入多输出（MIMO）能力能够支持高分辨率感知、多目标跟踪及高速数据传输。本文重点阐述了采用超大规模孔径阵列（ELAA）的超大规模MIMO技术的重要性，以及建立统一的近场与远场信道模型以支持高效ISAC的必要性。最后，本文概述了基于ELAA的6G FR3 ISAC系统面临的挑战及未来研究方向。