关于4GLTEFDD试验网严重干扰3G/4GTD商用网问题的分析

Analysis on the Problem of 4G LTE FDD Trial Network Seriously Interfering with 3G/4G TD Commercial Network

中国电信大量建设1 850—1 880MHz频段4G LTE FDD试验网,对中国移动所建1 880—1 900MHz的TD-SCDMA/TD-LTE商用网在多省产生严重干扰。为消除干扰,有单位提出,中间需要的5MHz保护频带由TDD侧提供,同时TDD对应频段要提高射频指标。针对这一不恰当的处理方法,分析了其对TD网络、TD-S终端和TD-LTE国际化推广所可能造成的严重影响,并提出了一种恰当的方法:把后用的FDD频段的下行1 875—1 880MHz作为保护频带,同时维持2012年工业和信息化部颁布的相关设备的射频指标规定。

The 4G LTE FDD testing network on 1850-1880MHz band established by China Telecom has severe interference to the commercial TD-SCMA/TDD-LTE network built by China Mobile in multiple provinces. In order to eliminate the interference, it is pointed out that the protection bandwidth of 5MHz is guaranteed by TDD, while the RF specifi cation relevant to the TDD band should be enhanced. According to the improper approach, its infl uences on TD network, TD-S terminal and internationalized TD-LTE are analyzed. An appropriate approach is proposed in which the downlink of 1875-1880MHz of FDD band is used to be the protection bandwidth. It conforms to the RF specifi cation promulgated by China's Ministry of Industry and Information Technology in 2012.