Due to abundant spectrum resources, communications in the millimeter-wave (mm-wave) bands have been widely considered as the key enabler for next-generation wireless systems, including future high-speed railway (HSR) wireless systems, to dramatically increase data rates. To overcome the hostile propagation properties of mm-wave bands, antenna arrays, which enable directional transmissions with extended transmission distance, become essential techniques. Nevertheless, the high cost of antenna arrays and the limited battery lifetime of user equipment are slowing down the practical deployment of mm-wave communications. Without these limitations, an HSR scenario is better suited for mm-wave communications. However, the point-like coverage of mmwave directional beams cannot provide robust access for high-mobility scenarios.

中文翻译：

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支持 AI 的 6 GHz 以下和 MM 波混合通信：与未来 HSR 无线系统一起使用的注意事项

由于频谱资源丰富，毫米波（mm-wave）频段的通信被广泛认为是下一代无线系统（包括未来的高速铁路（HSR）无线系统）大幅提高数据速率的关键推动因素. 为了克服毫米波段的不利传播特性，能够实现定向传输并延长传输距离的天线阵列成为必不可少的技术。然而，天线阵列的高成本和用户设备有限的电池寿命正在减缓毫米波通信的实际部署。没有这些限制，HSR 方案更适合毫米波通信。然而，毫米波定向波束的点状覆盖无法为高移动性场景提供稳健的接入。