全球围绕6GHz频段的博弈正日趋白热化之时，美国联邦通信委员会（FCC）立场突变，为这场争夺战 带来了戏剧性转折。 6GHz作为中频段仅存的大带宽优质资源，兼具广覆盖和大容量的双重优势，使其成为兵家必争之地。 移动通信阵营力主将该频段用于IMT（国际移动通信）系统，以支持5G/6G发展；而WiFi阵营则希望借 此提升无线网络性能，为用户带来更快速、更稳定的连接体验。 在这场争夺战中，中国早已展现明确立场。2023年，工信部率先在全球范围内将6GHz的上部频段 （6425—7125MHz）划归IMT系统使用。美国最初则持相反态度，FCC早在2020年就决定将整个6GHz 频段（5925—7125MHz）划归给WiFi使用。 然而局势近日出现重大转折。FCC突然改变立场，计划通过拍卖来重新分配6GHz频段：将上部频段 （6425—7125MHz）划给IMT系统，仅保留500MHz带宽的下部频段（5925—6425MHz）用于WiFi。这 一政策转向不仅颠覆了美国原有的频谱规划，也将对全球通信产业格局产生影响，两大技术阵营的力量 对比或将因此发生重大变化。 必争的"战略要地" 无线电频谱作为信息时代的"数字土壤"， ...

Group 1 - The core viewpoint of the news highlights China's advancements in high-speed rail technology, showcasing innovations such as a self-healing power supply system and the CR450 train, which operates at a speed of 400 km/h [2][4][10] - The self-healing traction power supply system can automatically locate faults, isolate affected areas, and restore power within one minute, significantly improving reliability compared to traditional systems [3][4][7] - The CR450 train, recognized as the fastest member of the Fuxing family, aims to maintain energy efficiency while achieving high speeds, with its intelligent sensing system monitoring thousands of operational parameters [8][10] Group 2 - The establishment of a 5G innovation laboratory supports the development of a complete 5G technology standard system for railways, enhancing communication and operational efficiency [12][14] - The laboratory has deployed five 5G base stations along the railway, ensuring comprehensive 5G-R network coverage, which is crucial for real-time monitoring and passenger services [14] - The advancements in high-speed rail technology, from the power supply system to the integration of 5G, signify a transformative shift in China's railway industry, setting a new benchmark for smart travel [12][14]