Baseband Subsystem; Rf Subsystem; Figure 3-3 Bts3606A System Structure - Huawei Airbridge BTS3606A Technical Manual

Technical Manual
Airbridge BTS3606A CDMA Base Station
Um interface
MS/AT
220 V AC
or 110 V AC

Figure 3-3 BTS3606A system structure

3.3.1 Baseband Subsystem

The baseband subsystem comprises the BCKM, BCIM, CCPM, CECM, and HPCM. It
has the following functions:
Provide Abis interface to process the Abis interface protocol.
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Provide a fiber interface to the RF subsystem to process the Um physical layer
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and Common Channel (CCH) MAC layer protocols.
Implement modulation/demodulation of CDMA2000 1x and 1xEV-DO baseband
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data and the coding/decoding of CDMA channels.
Provide synchronization clock signal to the BTS.
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Perform system resource management, operation and maintenance, and
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environment monitoring.

3.3.2 RF Subsystem

The RF subsystem consists of the CTRM, CHPA, C DDU, and CPCM. It has the
following functions:
I. On the forward link
The RF subsystem
1) Performs p ower-adjustable up-conversion and linear power amplification on the
modulated transmit signals.
2) Completes power combination (optional).
3) Filters the transmit signals.
4) Finally sends the signals to the antenna subsystem.
II. On the reverse link
The RF subsystem
1) Filters the signals received by the BTS antenna to suppress the out-band
interference.
2) Performs low-noise amplification.
RF subsystem
Antenna subsystem
Power supply and environment monitoring subsystem
BTS3606A
3-4
System Description
Chapter 3 Product Architecture
Abis
Baseband subsystem
interface
BSC