ZTE Corporation CBTSI119 Manuale Utente

ZXC10 CBTS (V1.0)Technical Manual

Confidential and Proprietary Information of ZTE CORPORATION

Logical Structure

BTS is logically divided into BDS and RFS, as shown in Fig. 3. The PWS is
also necessary in case there is no available –48V DC secondary power

supply on site.

I G

. 3

B T S

O G I C A L

T R U C T U R E

SBDS

To BSC

RFS

BDS

MBDS

RRFS

LRFS

SBDS

LRFS

RRFS

...

MBDS

SBDS

RRFS

1. BDS

BDS is further divided into three functional entities: BCS (BTS
Communication Subsystem), BBS (BTS Baseband Subsystem) and TFS

(Time Frequency Subsystem).
One BTS suffices for configuration no higher than 12 carrier sectors.

Two BTS cabinets can be combined for configuration higher than 12
carrier sectors. For two combined cabinets, one is the master one
(Master BDS, MBDS) and the other is the slave one (Slave BDS,

SBDS). MBDS and SBDS have the same structure and working
principle but with different configurations.

2. RFS

RFS is further divided into two parts: TRX and PA + RFE amplifier +

RFE subsystem. Its work includes some baseband processing, IF
processing, digital-to-analog conversion, RF modulation and

demodulation, forward signal power amplification, and backward signal
low noise amplification.
Please note that an RFS can be an LRFS (Local RFS) or RRFS (Remote

RFS), to meet different networking needs. If no otherwise specified,
the RFS in this book refers to an LRFS.

3. PWS

This subsystem supplies power to the whole BTS and it comprises

primary power supply (converts 200 V/1110 V AC to –48 V DC,