Frequency Range 3 (FR3), encompassing frequencies between 7.125 and 24.25 GHz, is an emerging frequency band for 6th generation (6G) applications. The upper mid-band, as it is frequently referred to, represents the sweet spot between coverage and capacity, providing better range than mmWaves and higher bandwidth than the sub-6 GHz band. Despite these advantages, the spectrum is already occupied by incumbent systems such as satellites (e.g., Starlink), and sharing it with terrestrial cellular applications results in spectrum conflicts, only exacerbating the existing spectrum scarcity. This article investigates the impact of two state-of-the-art methods, namely Quality of Service (QoS)-Aware Power Control and Interference Nulling, as well as their joint application, on interference mitigation toward non-terrestrial links while maintaining acceptable QoS on terrestrial networks. Our simulation results demonstrate the advantages and disadvantages of each method, pinpointing how interference nulling can maintain high average performance and how power control is more appropriate for risk-averse scenarios to enhance fairness in terrestrial QoS. Finally, we showcase how the two can complement each other to enhance fairness in terrestrial QoS and increase the Next Generation Node Base (gNB)'s energy efficiency, while suppressing interference toward incumbents.

翻译：频率范围3（FR3）覆盖7.125至24.25 GHz频段，是第六代（6G）移动通信的新兴应用频段。这一常被称为中高频段的频谱区间在覆盖与容量之间取得了理想平衡——既比毫米波提供更远传输距离，又较sub-6 GHz频段具备更高带宽。然而，该频谱已由卫星（如星链）等既有系统占用，与地面蜂窝应用共享将引发频谱冲突，进一步加剧现有频谱稀缺问题。本文研究了两种先进方法——即服务质量感知功率控制与干扰零陷技术及其联合应用——对非地面链路干扰抑制的影响，同时确保地面网络服务质量。仿真结果揭示了各方法的优劣：干扰零陷可维持较高平均性能，而功率控制更适合风险规避场景以增强地面QoS公平性。最后，我们论证了两种技术如何互补：在抑制对既有系统干扰的同时，提升地面QoS公平性与下一代基站（gNB）的能量效率。