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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved.

HUAWEI BTS3900

Hardware Structure


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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page2

Foreword

The BTS3900 developed by Huawei is an indoor macro BTS.

The BTS3900 mainly consists of the BBU and DRFU.

Compared with traditional BTS, the BTS3900 features

simpler structure and higher integration


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References

31183198-BTS3900 GSM Documentation

BTS3900 GSM Hardware Description

BTS3900 GSM Product Description


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Objectives

Upon completion of this course, you will be able to:

Know the application scenarios of BTS3900

Grasp the hardware structure of BTS3900

Grasp the functions of the modules Master typical configuration of BTS3900

Know the networking topology of BTS3900


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Contents

1. BTS3900 Overview

2. BTS3900 Hardware Components

3. BTS3900 Signal Flow4. BTS3900 Configuration

5. BTS3900 Network

6. GRFU Introduction


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Location of BTS3900

PSTNISDN

PSPDN

Um Interface

BTS3900

BTS3900

BTS3900

BTS3900

OMC

HLR/AUC/EIR

BSC

MSC/VLR

SMC/VM

A Interface

MAP

TUP,ISUPMS

MS

MS

MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller

HLR: Home Location Register AUC: Authentication Center EIR: Equipment Identity Register

MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center

VM: Voice Mailbox OMC: Operation and Maintenance Center


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Functions and Features

It supports multiple frequency bands, such as PGSM900,

EGSM900, and GSM1800

It supports the Abis IP/FE interface in hardware and enables Abis

over IP through software upgrade if required

It supports transmit diversity and PBT

It supports 2-antenna and 4-antenna receive diversity to improve

the uplink coverage

It is developed on the basis of the unified BTS platform for Huawei

wireless products and enables the smooth evolution from 2G to

3G


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Functions and Features

When the DRFU is configured, a BTS3900 can support a

maximum of 12 carriers in the maximum cell configuration of

S4/4/4. In addition, a site configured with the BTS3900s can

support a maximum of 36 carriers in the maximum cell

configuration of S12/12/12

When the GRFU is configured, a BTS3900 can support a

maximum of 36 carriers in the maximum cell configuration of

S12/12/12. In addition, a site configured with the BTS3900s cansupport a maximum of 72 carriers in the maximum cell

configuration of S24/24/24


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Contents

1. BTS3900 Overview


3. BTS3900 Signal Flow4. BTS3900 Configuration

5. BTS3900 Network



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BTS3900 Hardware Structure

The dimensions of the

BTS3900 cabinet

600mm(Width)*450mm(Depth)*

900mm(Height)

The weight of the BTS3900

cabinet

Empty cabinet:57kg

Full Configuration: 132kg


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Structure of the BTS3900 Cabinet

Double radio filter unit

-48V Cabinet

Fan box

GSM antenna and TMA control module

Baseband unit

Direct current distribution unit


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Structure of the BTS3900 Cabinet

+24V or 220VAC Cabinet

Power supply unit

Double radio filter unit

Fan box

Baseband unitDirect current distribution unit

GSM antenna and TMA control module


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Logical Structure and Signal Flow


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Contents

2.BTS3900 Hardware Components

2.1 BBU Unit

2.2 RF Unit

2.3 Power module & Components


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BBU

The typical power consumption of BBU is 35W The weight of the BBU is 12 kg at most

All the boards can be inserted from the front panel

The permissible range of power input is38.4 V DC to57 V DC


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Working Principles of the BBU


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Boards and Modules in BBU

BSBC: The universal BBU Subrack Backplane type C

GTMU: The GSM Transmission, Timing and Management Unit

UBFA: The Universal BBU Fan unit type A

UPEU: The Universal Power and Environment interface Unit

UELP: The Universal E1/T1 Lightning Protection unit

UEIU: The Universal Environment Interface Unit


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BSBC Board

The BSBC provides slot 6 for the GTMU, slot 7 for a main control boardthat supports 3G, and slots 0 to 5 as common slots. The GTMU is 1 U

high. Therefore, from the view of the front panel, the GTMU is located in

slots 5 and 6

Provide backplane interfaces, communication channels, distribute clock

signal and +12V power supply for the other boards


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GTMU The GSM Transmission, Timing, and Management Unit for BBU

(GTMU) controls and manages the entire BTS. It provides

interfaces related to the reference clock, power monitoring, OM,

and external alarm collection.

Distributes and manages BTS clock signals

Provides the Ethernet port for terminal maintenance

Supports four routes of E1 inputs

Provides the CPRI ports for communication with the DRFU


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GTMU Ports

LabelConnector

Type Description

CPRI0-CPRI5

SFPPorts for the communication between the BBU and the RF module;support input and output of the optical and electrical signal .

ETH RJ45 Port for local maintenance and commissioning

FE0 RJ45

A reserved port that performs the following function:

Connects the BBU to a routing device in the equipment room throughthe Ethernet cable to transmit network information.

FE1 DLCA reserved port that performs the following function:Connects the BBU to a routing device in the equipment room throughthe optical cable to transmit network information.

USB USBA reserved port that performs the following function:Enables the automatic software upgrade from a USB disk.

TST USB Provides a reference clock for the tester.

E1/T1DB26female

Provides the input and output of the four E1/T1 signals between theGTMU and the UELP or between the GTMU and the BSC.


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GTMU IndicatorsLED Color Status Description

RUN Green

ON The board is faulty.

OFF No power supply is available or the board is faulty.

ON for 1s, OFF for 1s The board is operational.

ON for 2s, OFF for 2s The OML link is abnormal.

ON for 0.125sOFF for 0.125s

The board is loading software.

ALM Red ON A fault occurs in the running board.

OFF No alarm is generated.

ACT GreenON The board is operational.

OFF The board is faulty.

LIU0-LIU3 Green

ON This link is not used.

ON for 0.125s

OFF for 0.125sA remote E1/T1 alarm is generated.

OFF This link is operational.

CPRI0-CPRI5

Green ON The CPRI link is normal.

Red ONThe reception of the optical module is abnormal and analarm is generated.


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UELP

UELP is the E1/T1 signal lightening protection unit of BBU and itcan provide protection for 4 route E1/T1 signal

Port Type Relative cables Description

INSIDE DB25 male E1 transferringcable

Transfers the four E1/T1

signals between the UELP andthe GTMU

OUTSIDE DB26 male E1/T1 cableProvides the input and outputof the four E1/T1 signalsbetween the BBU and the BSC

GTMU


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UPEU

The universal power and environment interface unit (UPEU) supports the -48V /-24V DC power input, supplies power to the boards, modules, and fan

in the BBU, and provides access to multiple environment monitoring

signals

Port Type Description

MON0 RJ45Transmitting two RS485environment monitoring signals

MON1 RJ45Transmitting two RS485environment monitoring signals

EXT-ALM0

RJ45Transmitting four dry contactalarms

EXT-ALM1

RJ45Transmitting four dry contactalarms

PWR 3V3 +24 V/-48 V DC power input


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UEIU

UEIU is the environment interface board of BBUit can supportmulti-route monitoring signal input

UEIU is optional and is only used when more ports are needed

Label ConnectorType

Description

MON0 RJ45 One RS485 signal

MON1 RJ45 One RS485 signal

EXT-ALM0

RJ45Four dry contactsignals

EXT-ALM1

RJ45Four dry contactsignals


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Monitoring System


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USCU

The Universal Satellite Card and Clock Unit (USCU) is compatible with six typesof satellite card, provides absolute timing information and the 1 Pulse Per

Second (PPS) reference clock for the main control board, and provides the

RGPS ports and BITS port.

Port Description

1 GPS port Used for receiving GPS signals

2 RGPS ports Used for receiving RGPS signals

3 BITS portConnected to the BITS clock; supporting adaptive inputof the 2.048 MHz and 10 MHz clocks

4 TEST port Used for testing the clock


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UBFA

The universal BBU fan unit type A (2U) (UBFA) works with the air inlet box ofthe cabinet to form a ventilation circuit, thus cooling the entire cabinet

The UBFA module communicates with the GTMU to regulate the temperature,

adjust the fan speed, and report alarms. The UBFA module is hot swappable

Label Color Status Description

STATERed

/Green

0.125s ON,0.125s OFF(Green)

The module is not registered, andno alarm is reported.

1s ON, 1sOFF (Green)

The module is running properly.

1s ON, 1sOFF (Red)

The module is reporting alarms.

OFFThe module is powered off or theprogram is not loaded.


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BBU Cables Connection

BBU cables connection between BBU, BSC, RFU andAuxiliary equipment


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BBU Hardware structure-Review

Please fill the boards name in the blank of the BBU

panel


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Contents


2.1 BBU Unit

2.2 RF Unit

2.3 Power module and Components


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RF Unit

RF Unit handles modulation and demodulation between

baseband signals and RF signals, data processing, and

combining-distribution. There are two kinds RF Unit, DRFU

and GRFU

One Double Radio Frequency Unit (DRFU) provides two

TRXs.

One GSM Radio Frequency Unit (GRFU) provides a

maximum of six TRXs.


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Main Functions of DRFU

One double radio filter unit (DRFU) provides two TRXs

The DRFU performs modulation and demodulation between

baseband signals and RF signals, processes data, and

combines and divides signals


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Working Principles of the DRFU

The DRFU consists of the high-speed interface unit, signal

processing unit, power amplifier, and dual-duplexer


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Ports of the DRFU

Type Connector Ports Description

Port fortransmitting andreceiving RFsignals

N femaleconnector

ANT1

Used in connection to the antenna subsystemANT2

CPRI portSFP femaleconnector

CPRI0Used in connection to the BBU, or in connectionto the upper-level cascaded DRFU

CPRI1 Used in connection to the lower-level cascadedDRFU

Port fortransmitting RFsignals between

DRFUs

QMA femaleconnector

RX1 inInput port for diversity signals in antenna channel1

RX1 outOutput port of diversity signals in antennachannel 1

RX2 inInput port for diversity signals in antenna channel

2

RX2 outOutput port of diversity signals in antennachannel 2

Power port7W2 powerconnector

PWR Receives power input


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LEDs of the DRFULED Color Status Description

RUN Green

On The power input is normal, but the module is faulty.

Off No power input is available, or the module is faulty.

On for 1sOff for 1s

The module is functional.

On for 0.125sOff for 0.125s

The module is loading data.

ALM Red

On for 1sOff for 1s

A fault alarm is generated.

Off No alarm is generated.

OnA fault alarm is generated, need to change anothermodule.

ACT Green

OnThe module is functional and is correctly connectedto the BBU.

Off The connection with the BBU is not established.

On for 1sOff for 1s

The DRFU is being tested on the Site Maintenance


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LEDs of the DRFU

VSWR Red

Off No VSWR alarm is detected.

On for 1sOff for 1s

The VSWR alarm is generated only on the ANT2port.

On for 0.125sOff for 0.125s

The VSWR alarms are generated on the ANT1 andANT2 ports.

OnThe VSWR alarm is generated only on the ANT1

port.

CPRI0RedGreen

On (green) The CPRI link is functional.

On (red) The interface module fails to receive signals.

On for 1sOff for 1s (red)

The CPRI link has a loss-of-lock error.

CPRI1RedGreen

On (green) The CPRI link is functional.

On (red) The interface module fails to receive signals.

On for 1sOff for 1s (red)

The CPRI link has a loss-of-lock error.


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Question

If the VSWR is always on, what does it mean? Can youdescribe the Impact on the system and the reasons?

It means only ANT1 have VSWR Alarm. Once the alarm is

generated, the service carried by the TRX is totally interrupted.

The reasons list as following: The VSWR of the antenna system is too high.

The connection between the output port of the TRX and the feeder

is improper.

The antenna system is not in connection for the DRFU. The DRFU is faulty.

Data configuration in BSC is incorrect.


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Contents


2.1 BBU Unit

2.2 RF Unit

2.3 Power module and Components


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Main Functions of DCDU

Receiving -48 V DC power input Distributing the -48 V DC power of 10 outputs for boards and

modules in the cabinet

Providing surge protection of 10 kA in differential mode and 15 kA in

common mode and providing dry contact for surge protection failure


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Power Subrack (AC/DC)

The power subrack (AC/DC) consists of the PMU, PSU (AC/DC)and the wiring unit of the power subrack (220 V).

The power subrack (AC/DC) converts the 220 V AC power to the -

48 V DC power.

1) PMU

2) PSU3) Wiring unit


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Main Functions of PMU(AC/DC)

The Power and Environment Monitoring Unit (PMU) provides acomprehensive function of power supply management, power

distribution check, and alarm reporting.

Communicates with the GTMU through the RS232/RS422 serial port

Manages the power system and the battery charging and discharging

Detects and reports monitoring signals

1. LEDs

2. Power supply test ports3. RS232/RS422 ports4. Battery control switch5. COM port


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Ports of PMU

Ports Function

RS232/RS422port

Used in communication with the central processing unit

Battery switch

The battery switch has two control ports ON and OFF, which areused for switching on and switching off the batteryPress and hold the port ON for 5-10 seconds to switch on thebatteryPress and hold the port OFF for 5-10 seconds to switch off thebattery

Power supplytest port

Two power supply test holes -48V and 0V are available formeasurement through an ordinary multi-meter

COM port Used in connection to the external signal transfer board

Backplane port Used in connection to the backplane


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Main Functions of PSU(AC/DC)

Converting 220 V AC power to -48 V DC power and supplying -48 V DCpower to the DCDU

Monitoring alarms related to module faults (such as output overvoltage,

no output, and fan faults), alarms related to module protection (such as

over temperature protection and input overvoltage/undervoltage

protection), and module out-of-position alarm

1 Power running LED

2 Protection LED3 Fault LED

123


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Power Subrack (DC/DC)

The power subrack (DC/DC) provides access for the external +24V DC. In the power subrack, it contain two components, PSUs

(DC/DC) and Wiring unit.

PSUs (DC/DC) convert the +24 V DC power into the -48 V DC

power, and then leads the -48 V DC power to the DCDU-01 over

the power cable through the wiring unit of the power subrack.


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Main Functions of PSU(DC/DC)

Converting +24 V DC power to -48 V DC power andleading the -48 V DC power to the DCDU

1 2 3

1 Power running LED2 Protection LED3 Fault LED


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Power Distribution Mode 1

The BTS3900 cabinet can use three types of power inputs, namely, -48 V DC,+24 V DC, and 220 V AC

If the external -48 V DC power input is used, no additional power system is

required. The external -48 V DC power input is directly connected to the

power input terminals on the DCDU (10 outputs). Then, the DCDU distributes

the -48 V DC power to each module in the cabinet


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When the external +24 V DC power or +220V AC power is used, PSUsand a cable in/out unit are configured in the cabinet. The PSUs convert

the external power into the -48 V DC power and supply the -48 V DC

power to the DCDU Then, the DCDU distributes the -48 V DC power to

each module in the cabinet


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This is the power distribution when a -48 V DC cabinet is stacked on a+24 V DC cabinet or +220V AC cabinet. The PSUs convert the external

+24 V DC or +220VAC power into the -48 V DC power and supply -48 V

DC power to the DCDUs in both cabinets. Then, the DCDUs distribute the

-48 V DC power to the modules in both cabinets


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Main Functions of GATM

The GSM antenna and TMA control module (GATM) is a modulethat controls the antenna and TMA. The GATM is optional when

the DRFU module is configured.

Controls the RET antenna

Feeds power to the TMA

Reports the RET control alarm signals

Monitors the current from the feeder


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Ports on the GATM

Ports Connector Function

ANT0ANT2ANT4

SMA femaleProviding power for the RET antenna andtransmitting control signals for the RET antenna

ANT1

ANT3ANT5

SMA female Providing power for the antenna

COM1 RJ45 Used in connection to the BBU

COM2 RJ45Providing the extended RS485 port to be cascadedwith other devices

-48 V 7W2 Receiving the -48 V power input


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Features and Functions of Fan Box The FAN unit, also called the fan box module, dissipates the

heat in the cabinet. One FAN unit has four independent fans.

Detects the temperature

Communicates with BBU unit to report alarms and the adjusted

rotation speed of the fans to BBU


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Cable Connection of -48V CabinetCable

Number

Cable NameQuantit

yR1-R12 RF Jumpers 12

P1-P2 External Power Cables (-48 V) 2

P3-P8Power Cables Between the DCDU andDRFUs

6

P9 Power Cable Between the DCDU and FanBox 1

P10 Power Cable Between the DCDU and BBU 1

P11-P12 Reserved 2

S1-S6CPRI Signal Cables Between the BBU andDRFU

6

S7 E1 Transfer Cable of the BBU 1

S8 Monitoring Signal Cables for the DCDU 1

S9 Monitoring Signal Cable for the Fan Box 1

S10 E1/T1 Cable of the BBU 1


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Contents

1. BTS3900 Overview


3. BTS3900 Signal Flow

4. BTS3900 Configuration

5. BTS3900 Network



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BTS3900 Signal Flow

The signal flow of the BTS3900 consists of the traffic signalflow and the signaling flow of the BTS.

DL traffic signal flow

UL traffic signal flow Signaling flow


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Traffic Signal Flow

The DL traffic signal flow is transmitted from the BSC to the MSthrough the BTS3900. The BBU and RFUs work together to

process the DL traffic signals

Opposite to the DL traffic signal flow, the UL traffic signal flow is

transmitted from the MS to the BSC through the BTS3900. The

BBU and RFUs work together to process the UL traffic signals

BBU DRFUE1

CPRI

DBUS

CBUSFHBU

S

RF

BSC


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Signaling Flow

This describes the BTS3900 signaling flow on the Abisinterface. The BBU serves as the control unit and works with

the RFUs to process the signaling.

BBU DRFUE1 CPRI

DBUSCBUS

FHBUS

BSC


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Contents

1. BTS3900 Overview




5. BTS3900 Network



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Contents

4. Configurations of the BTS3900

4.1 Configuration Principle

4.2 Antenna Mode

4.3 Transmit Mode and Receive Mode

4.4 Typical Configuration


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Basic Configuration Principles

The DRFU supports a maximum of two carriers and it is applicableto small- and middle-capacity scenarios

The GRFU supports a maximum of six carriers and it is applicable

to large-capacity scenarios

The DRFU and GRFU can be configured in the same cabinet or

cell to support flexible capacity expansion

Wide coverage is preferred. The DRFU supports the PBT, TX

diversity, and 4-way RX diversity mode. Therefore, the DRFU can

be applied to wide-coverage scenarios


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Antenna Configuration Principles

One dual-polarized antenna can serve a maximum of two RFUs.

By default, RX diversity is adopted on the GSM network. That is,

two feeders connected to two single-polarized antennas or one

dual-polarized antenna must be configured in a cell.

Each cell of the BTS must be configured with the minimum

number of antennas.

For the 2-way RX diversity, each cell has two antenna channels;

for the 4-way RX diversity, each cell has four antenna channels.


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DRFU Configuration Principles

A single DRFU does not support the S1/1 application;however, three DRFUs support the S3/3 application

When the DRFU works in TX PBT, TX diversity, or 4-way

RX diversity mode, a DRFU provides only one TRX.

When only DRFU are configured, One BTS3900 can

support a maximum of 12 carriers in the maximum cell

configuration of S4/4/4. A site configured with the BTS3900s

can support a maximum of 36 carriers in the maximum cellconfiguration of S12/12/12


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Contents



4.2 Antenna Mode




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DRFU Antenna Mode

Single Feeder

Single Feeder (1TX + 1RX), for one DRFU configuration

Single Feeder (1TX + 2RX), for two DRFUs configuration

Double Feeder Double Feeder (1TX + 1RX), for one DRFU configuration

Double Feeder (1TX + 2RX), for one DRFU configuration

Double Feeder (2TX + 2RX), for one DRFU configuration

Double Feeder (2TX + 4RX), for two DRFUs configuration


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Signal Feeder

Single Feeder (1TX + 1RX) Single Feeder (1TX + 2RX)

TX/RX TX/RXTX/RX


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Double Feeder

Double Feeder (1TX + 1RX) Double Feeder (1TX + 2RX)

TX RXTX/RX RX


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Double Feeder

Double Feeder (2TX + 2RX) Double Feeder (2TX + 4RX)

TX/RX TX/RX TX/RX TX/RXRX RX


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Contents



4.2 Antenna Mode




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Transmit Mode and Receive Mode

DRFU transmit mode Transmit independency or combining

PBT

Dynamic PBT Diversity transmitter

DRFU receive mode

Main diversity receiver Four diversity receiver


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DRFU Internal Structure

2 TRXs and 2 duplexers are integrated in DRFU module which can be

connected to antenna directly

The RX_IN and RX_OUT port of DRFU can support the receiving signal

interconnection between 2 DRFUs, so that the 2 DRFUs can share different

feeders

InterfaceProcessingUnit

DUP

DUP

CPRI-0

CPRI-1

ANTA

ANTB

RX-IN

RX_OUT


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Transmit Independency

In transmit independency mode, TRX0 occupies channel Awhile TRX1 occupies channel B

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP


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Transmit Combining

In transmit combining mode

the two TRXs are combinedand transmitted through channel A

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP


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PBT

In PBT mode, only the TRX0 can work

PBT mode can improve the transmitting power

In PBT modeonly channel A is used by downlink signal

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP


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Dynamic PBT

Dynamic PBT is a mode based on the operation of timeslots,

compared with static PBT, it brings the balance between capacity

and coverage and does not cause the 50% decrease of capacity

The subscriber occupies a TS under the detection of measure

report. When the quality is lower than a threshold, the same No. of

TS of the adjacent TRX will be used as the secondary TS by the

subscriber to start PBT. (The former subscriber in the secondary

TS will handover) When the quality is higher than a threshold, the

PBT will be canceled and the secondary TS will be released


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The Principle of Dynamic PBT

Timeslots TRXs

Good quality

Poor quality

Signal quality

No signal


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Transmit Diversity

In Transmit diversity mode, only the TRX0 can work

Transmit diversity mode improves the quality of downlink signal

In Transmit diversity modethe signal from the TRX0 is divided to 2

channels and be transmitted through ANTA andANTB

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP


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Question

When configuring Transmit Mode, Transmit Independencyor Combining can be chosen. How can we know whether

Transmit Independency or Transmit Combining is used?

It will be decided by antenna mode. When 2 TRXs are used

in one DRFU,

If the antenna mode is Single antenna or Double

antenna(1TX), the transmit mode must be Transmit

Independency

If the antenna mode is Double antenna(2TX), the transmit

mode must be Transmit Combining


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Main Diversity receiver

In this modeboth of the 2 TRXs can work

Each TRX receives the signal from 2 feeders

In the following figurethe TRX gets the receiving signal from channel A and B of

the single DRFU

It is also possible for TRX to share the receiving channels with another DRFU

If only one ANTchannel is used,

TRX can alsouse the ANT

channel of otherDRFU through

RX-in to ensure2 way receiving

CPRI0

CPRI1

Interface

ProcessingUnit

ANT1

ANT2

DUP

DUP

RX-IN

RX_OUT


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Four Diversity Receiver

In this mode, only the first TRX can work

The working TRXs get the uplink signals from 4 ANT ports of 2

DRFUs

Cable connectionfor sharing the

receiving signals

CPRI0

CPRI1

Interface

Proc

essing

U

nit

ANT1

ANT2

DUP

DUP

RX-IN

RX_OUT

CPRI0

CPRI1

Interface

P

rocessing

Unit

ANT1

ANT2

DUP

DUP

RX-IN

RX_OUT

C


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Contents

4. Configurations of the BTS39004.1 Configuration Principle

4.2 Antenna Mode



DRFU S1/S2 C fi i


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DRFU S1/S2 Configuration

S1 Configuration

TX mode: Transmit Independency or Combining

RX mode: Main diversity receiver

Antenna mode: Double antenna(1TX+2RX)

S1 Configuration

TX mode: Transmit diversity



S2 Configuration

TX mode: Transmit Independency or Combining



DRFU S2/S3/S4 C fi i


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DRFU S2/S3/S4 Configuration

S2 Configuration

TX mode: PBT


Antenna mode: Single antenna(1TX+2RX)

S3/S4 Configuration TX mode: Transmit Independency or

Combining



DRFU S5/S6 C fi ti


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S5/S6 Configuration

TX mode: Transmit Independency or

Combining


Antenna mode

DRFU0: Single antenna(1TX+2RX)


DRFU2: Double antenna(1TX+2RX)

DRFU S7/S8 C fi ti


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S7/S8 Configuration


Combining



DRFU S3/3 C fi ti


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DRFU S3/3 Configuration

S3/3 Configuration


Combining


Antenna mode


DRFU1: Double antenna(2TX+4RX)


C t t


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Contents

1. BTS3900 Overview




5. BTS3900 Network


BTS St T l


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BTS Star Topology

The star topology applies to common areas, especially denselypopulated areas, such as cities

In the star topology, each site is directly connected to the BSC

BTS Ch i T l


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BTS Chain Topology

The chain topology applies to sparsely populated areas in strip-like terrain, such as areas along highways and railway tracks

The chain topology reduces cost in transmission equipment,

construction, and transmission link lease

BTS T T l


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BTS Tree Topology

The tree topology applies to areas where network structures,

site distribution, and subscriber distribution are complicated

The tree topology requires fewer transmission cables

compared with the star topology

BTS Ring Topolog


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BTS Ring Topology

The ring topology applies to common scenarios. Due to its strong

self-healing capability, the ring topology is preferred if permitted

by the routing

If there is a breaking point in the ring, the ring breaks into two

chains at the breaking point automatically. In this way, the BTSs

preceding and following the breaking point can work normally

despitethe breaking point; thus improving the robustness of the

system

DRFU Topologies Configuration


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DRFU Topologies Configuration

The DRFU supportsvarious network

topologies: star, chain,

and ring

Contents


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Contents

1. BTS3900 Overview




5. BTS3900 Network


Introduction of GRFU


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Introduction of GRFU

GRFU is based on multi-carrier technology, one GRFU cansupport six TRXs at most.

GRFU performs modulation and demodulation between

baseband signals and RF signals, processes data, and

combines and divides signals.

The main new features and functions of GRFU

Inner Bias-Tee. Integration of feeder current to TMA.

Provides power sharing. Improves the network coverage,reduces the interference and power consumption and save the

device cost.

Multi carrier Technology


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Multi-carrier Technology

The principle of multi-carrier technology: multiple carriers share one

power amplifier and one RF channel.

Baseband pool replaced independent baseband unit. Improve the

integration.

Digital IF combination replaced Analog RF combination. There isnt

combination loss.

Single-carrier Technology Multi-carrier Technology

Ports of GRFU


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Ports of GRFU

Port Type Label ConnectorType

Description

Port fortransceiving RFsignals

ANT_RXBDINconnector

Connecting to the antenna subsystem.

ANT_TX/RXADINconnector

CPRI

CPRI0SFP female

connector

Connecting to the BBU, or the upper-level

RFU during the cascading.

CPRI1SFP femaleconnector

Connecting to the lower-level RFU duringthe cascading.

Interconnectionport for RF receivesignals

RX_INBQMAfemaleconnector

Input port of diversity signals in the antennachannel.

RX_OUTAQMAfemaleconnector

Output port of diversity signals in the

antenna channel.

Power supply port PWR3V3 powerconnector

Feeding power.

Monitoring port MONRJ45connector

Monitoring port.

LEDs of GRFU


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LEDs of GRFU

LED Color Status Description

RUN Green

ON The power input is normal, but the module is faulty.

OFF There is no power supply, or the module is faulty.

1s ON1s OFF

The module is running properly.

0.2s ON

0.2s OFF The software is being loaded to the module.

ALM Red

1s ON1s OFF

A fault alarm is generated.

OFF No alarm is generated.

ACT Green

ONThe module is functional and is correctly connected tothe BBU.

OFF The connection with the BBU is not set up.

VSWR RedOFF No VSWR alarm is generated.

ON The VSWR alarm is generated on the ANT_TX/RX port.

LEDs of GRFU


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LEDs of GRFU

CPRI0RedGreen

ON (Green) The CPRI link is normal.

ON (Red) The interface module fails to receive signals.

1s ON

1s OFF (Red) The CPRI link is out of lock.

CPRI1RedGreen

ON (Green) The CPRI link is normal.

ON (Red) The interface module fails to receive signals.

1s ON,

1s OFF (Red)

The CPRI link is out of lock.

Compare GRFU with DRFU


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Compare GRFU with DRFU

Port Type GRFU Relativeposition

DRFU Relativeposition

Port for

transceiving

RF signals

ANT_TX/RXA lower ANT1 upper

ANT_RXBupper ANT2 lower

CPRICPRI0 lower CPRI0 upper

CPRI1 upper CPRI1 lower

Interconnection

port for RF

Receive signals

RX_INB upperRx_1 in

Rx_1 out

RX_OUTA lowerRx_2 in

Rx_2 out

Monitoring port MON existenceNon

existence

Output power of GRFU


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Output power of GRFU

The output power of different configuration is also configured

differently

Frequency bands ConfigurationOutput power

GMSK/8PSK

PGSM 900MHz /GSM1800MHz

S1 80W/53W

S2 40W/26W

S3 31W/20W

S4 27W/17W

S5 18W/12W

S6 16W/10W

Limitation of GRFU


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Limitation of GRFU If the frequency interval of a cell is outside the range of 15MHz, 2 GRFUs can be

considered to be used and the range of frequency for each GRFU also should be

within15MHz.

Generally, it is suggested that the number of carriers should be set to 2 GRFUs

averagely if 2 GRFUs are used in a cell. For example: S8 should be configured

as 4+4 when 2 GRFU are used.

GRFU supports whole frequency band of PGSM 900MHz, high 45MHz frequency

band and low 45MHz frequency band of DCS1800MHz.

GRFU DL UL

Whole 25MHz frequency

band of 900MHz 935-960MHz 890-915MHz

Low 45MHz of 1800MHz 1805-1850MHz 1710-1755MHz

High 45MHz of 1800MHz 1835-1880MHz 1740-1785MHz

Configuration Principle of GRFU


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Configuration Principle of GRFU

The DRFU and GRFU can be configured in the same cabinet.

When the GRFU is configured, a single BTS3900 provides a

maximum of 36 carriers with the maximum cell configuration of

S12/12/12. In addition, a site configured with the BTS3900s can

support a maximum of 72 carriers, with the maximum cellconfiguration of S24/24/24.

One GRFU does not serve two cells.

Each cell with a single antenna can be configured with a

maximum of two GRFUs.

Transmit Mode and Receive Mode of


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GRFU

GRFU Transmit Mode Transmit independency or combining

GRFU Receive Mode

Main diversity receiver

GRFU S2-S6 Configuration


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S2-S6 Configuration


Combining





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S7-S12 Configuration

TX mode: Transmit Independency

or Combining


Antenna mode: Single

antenna(1TX+2RX)

DRFUGRFU Configuration


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Combining


Antenna mode:

GRFU: Single antenna(1TX+2RX)

DRFU: Single antenna(1TX+2RX)



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Combining


Antenna mode:

GRFU: Double antenna(1TX+2RX)

DRFU: Double antenna(1TX+2RX)

Summary


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Summary

BTS3900 functions and features

BTS3900 hardware structure and components

Working mode, configuration principles, RF cable

configurations, typical configurations

BTS networking topology and RFU connection


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