Multi-Carrier; Receiving Diversity; Cell Breathing - Huawei Airbridge BTS3606A Technical Manual

Technical Manual
Airbridge BTS3606A CDMA Base Station

4.5 Multi-carrier

The BTS3606A supports multi-carrier technology. The single-carrier cabinet can hold
both the single-carrier and multi-carrier modules.
A single-carrier transceiver module (consisting of one CTRM and one CHPA) can
process one carrier signal. A multi-carrier transceiver module (consisting of one CMTR
and one CMPA) can process three carrier signals. Hence, in a single-carrier cabinet,
the adoption of multi-carrier transceiver module can realize the maximum configuration
of S(6/6/6), that is, 18 sector carriers.
The multi-carrier module supports the 1900 MHz and 800 MHz. The BTS3606A of later
version is expected to supported more bands.

4.6 Receiving Diversity

The BTS3606A supports receiving diversity function. The receiving diversity is realized
through two sets of independent receiving equipment, each of which comprises
antenna, feeder, CDDU, and main/diversity receiving channels.
The two sets of receiving equipment demodulate the received signals simultaneously.
Then the baseband processing unit decodes the signals with diversity combining
algorithm so as to provide some diversity gain.
The receiving diversity enhances the anti-attenuation capability of the BTS receiver,
and ensures the receiving effect of the BTS under complicated radio environment.

4.7 Cell Breathing

Under the control of the BSC, the BTS3606A adjusts the transmit power to control the
effective coverage area and balance the system load as required.
When the BTS3606A provides the cell breathing function, the controllable range of the
transmit power is from 0 dB to 24 dB and the adjustment step of transmit power is 0.5
dB.
4-8
System Description
Chapter 4 Main Functions