Zte ZXSDR BS8908 G060, Руководство пользователя

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Chapter 1 System Overview
1.2.2 System Position in Distributed Base Station
Functions
BBU and RRU are arranged as shown in Figure 1-2 . BBU contains the following parts:
baseband processing, transmission, and control. The RF processing part is designed in
RRU.
Figure 1-2 Base Station (BBU+RRU)
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The base station is divided into BBU and RRU. One BBU provides the shared
baseband resource for multiple RRUs.
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BBU performs digital baseband signal processing and control management.
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RRU implements conversion between baseband signal and analog RF signal, which
are transmitted between BBU and antenna.
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BBU is connected with RRU through the baseband-RF interface (optical interface),
transmitting I/Q digital baseband signal and OAM signaling data.
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BBU is connected with BSC/Node B through Abis/Iub interface.
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RRU is connected with MS/UE through Um/Uu interface.
Distributed Base Station Architecture
BBU and RRU form the distributed base station system. One central BBU can manage
a group of RRUs, implementing fast and flexible configuration and networking for the
base station system. The BBU+RRU mode reduces the equipment room requirement,
decreases the feeder loss, and provides a more flexible site layout mode.
BBU is arranged indoors, connecting RRU, which is often outdoors, through optical fiber.
Figure 1-3 shows the distributed base station architecture.
1-3
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