25 series - Node B architecture
The base station is known as a Node B. The Node B handles low-level radio transmission and reception to and from the mobile: roughly speaking, it implements the physical layer of the Uu interface, although the details are more complex. Each Node B handles one or more cells: each cell is managed by a different antenna and is typically implemented as an azimuthal sector.
Some antennas are fixed, but RET antennas can be tilted remotely. Among the many components of a Node B is an optional interface through which it can control an RET antenna.
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