它是基站的延伸，其射频拉远单元（RRU）可以放置在高楼、地铁、边远地区等信号盲区，对提高网络的覆盖能力起着重要的作用。
It is the extension device of the base station and can be placed in the signal blind zone , such as metro and remote area . It plays an important role in improving the network coverage .
射频拉远单元