BTS system and its main Boards-20100618

contentBTS systemSingle-mode BTS boards BTS312Double-density BTS boards BTS3012, BTS3012AE, BTS3006

contentBTS systemSingle-mode BTS boardsBTS312 Double-density BTS boards BTS3012, BTS3012AE, BTS3006

BTS system

DLULBTS System

contentBTS systemSingle-mode BTS boards BTS312 Double-density BTS boards BTS3012, BTS3012AE, BTS3006

BTS Cabinet

CDU

SCU

Combined 4 routes input signals into one;Combine Loss : 6.8dB;SCU should works with CDU together;Signal flow: TRX-SCU-CDU.

CDU & SCU for s4/4/4

CDU Configuration:

double CDU for s4/4/4

CDU Configuration:

S6

This is for concentric cells, TRX 5/6 should be configured on underlaid Subcell; CDU Configuration:

S8CDU Configuration:

Configuration depends on which CDU does diversity signal come from. Usually it is configured as the first case. TRXs Main and Diversity signal come from different CDU.

contentBTS systemSingle-mode BTS boards BTS312 Double-density BTS boards BTS3012, BTS3012AE, BTS3006

BTS Cabinet

DTRU: Double-Transceiver Unit

Functions of DTRUBaseband Processing Part:Processing signaling, coding and decoding, interleaving and de-interleaving, modulation and demodulation; Supports RF loop test and switchover of the faulty phase-locked loop; Amplifying output power;RF Transmitting Part:Modulates the baseband signals into RF signals and performs up-conversion, filtering, and RF hopping; Amplifies and outputs the RF signalsThe transmitting modes: Transmit independency; PBT; Wideband combination; Transmit diversityRF Receiving Part:Demodulates the RF signals into baseband signals and performs RF hoppingDivides the received RF signals and performs receive diversityThe receiving modes: Receive independency; Receive diversity; Four-way receive diversity

Transmit independency mode (not used)

F2F1F2F1Two route of signal send at the same time.

two TRXs work independently without using the combination unit

PBT mode: power booster technology (not used)

f1f1f1f1Two routes of signal combined at the same time. Power boosted up.

modulation and DA conversion. divided into two signals and sent to the power amplifier for amplification. combined. As these two routes of signals are aligned in phase, the output power is amplified after combination.

Wideband combination mode

f1f2f1TCOM:f2

the two transceivers are combined through a combiner before transmission.

Transmit diversity mode (not used)

f1f1f1f1f1t1t2t1!=t2Two route of signal send at different time.

Receive independency mode (not used)

each TRX of the DTRU has its own main and diversity routes.

Receive diversity mode1. each main/diversity signal is divided into two 2. sent to the main and diversity ports of each TRX. There are actually only two external RF cables that carry the main and diversity signals.

Four-way receive diversity mode

four routes of signals are sent to one TRX. The four-way receive diversity achieve more uplink gain than the main receive diversity does.

Note: only one TRX in the DTRU is used

DDPU: Dual-Duplexer Unit for DTRU BTS

The DDPU performs the following functions:1 Provides lightning protection through the ANT port2 Detect VSWR alarms in the antenna system3 Control the gains for the receive low noise amplifier4Transmits multiple routes of RF signals from the transmitter to the antenna5 Receives signals from the antenna, amplifies and quarters these signals, and then transmits them to the receiver of the DTRU

DDPU low noise amplifier and VSWR parameter.

DCOM: Combining Unit for DTRU BTS

DCOM receives two routes of DL signals from DTRU and combines them into one route. Then, DCOM transmits the combined signals to DDPU, which sends the signals to the antenna for transmission.The precondition for configuring the DCOM is that the wideband combination function in the DTRU must be used when there is an additional requirements for the combination of signals.To DDPU From DTRU

S4/4/4

S4/4/4 wideband transmit combination mode : each cell is configured two DTRU and one DDPU BSC data configuration should be : wideband transmit combination mode , receive diversity mode Cabinet Top powerdBm: 47.8-3.3-1.0

S6/6/6S6/6/6: each cell configured 3 DTRU, 1 DCOM and 1 DDPUBSC data configuration should be : wideband transmit combination mode , receive diversity mode;Cabinet top power (dBm): underlay 47.8-3.3-1.0; overlay 47.8-3.3-3.3-1.0;

S8/8/8S8/8/8 each cell configured 4 DTRU, 2 DCOM and 1 DDPUBSC data configuration should be : wideband transmit combination mode , receive diversity modeCabinet top power (dBm): 47.8-3.3-3.3-1.0

two TRXs work independently without using the combination unitmodulation and DA conversion. divided into two signals and sent to the power amplifier for amplification. combined. As these two routes of signals are aligned in phase, the output power is amplified after combination.the two transceivers are combined through a combiner before transmission.