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Bbu和rru都是移动基站的设备，bbu上联传输，下联rru，rru连接天线。rru相当于收发信机，接收发射信号，bbu+rru=bts移动收发信台 bbu (bui lding base band unite)室内基带. Bbu和rru是4g通信系统中关键组成部分。 bbu全称为building baseband unit，即室内基带处理单元，负责处理无线信号的基带部分。 而rru即radio remote unit，. Bbu和rru的区别在无线通信系统中，rru（remote radio unit，远端射频模块）与bbu（building baseband unit，室内基带处理单元）是两个关键组件。rru负责处理射频信.
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