Ome501102 Huawei Bts3900a Hardware Structure Issue2.00

HUAWEI BTS3900A Hardware Structure

www.huawei.com

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

Foreword z

The BTS3900A developed by Huawei is an outdoor macro BTS that performs the same tasks as the BTS3900. The BTS3900A mainly consists of the BBU and DRFU. Compared with traditional BTS, the BTS3900A features simpler structure and higher integration


Page1

References z

31183199-BTS3900A GSM Documentation

BTS3900A GSM Hardware Description

BTS3900A GSM Product Description


Page2

Objectives z

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

Know the application scenarios of BTS3900A

Grasp the hardware structure of BTS3900A

Grasp the functions of the modules

Master typical configuration of BTS3900A

Know the networking topology of BTS3900A


Page3

Contents 1. BTS3900A Overview 2. BTS3900A Hardware Components 3. BTS3900A Signal Flow 4. Configurations of the BTS3900A 5. BTS3900A Network 6. GRFU Introduction


Page4

Location of BTS3900A Um Interface

MS

PSTN ISDN PSPDN

TUP,ISUP

BTS3900A BSC A Interface MS

MSC/VLR M

MAP

AP

BTS3900A

HLR/AUC/EIR

BTS3900A MS

BTS3900A

SMC/VM OMC

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


Page5

Functions and Features z

It supports the Abis IP/FE interface in hardware and enables Abis over IP through software upgrade if required

z

It supports transmit diversity and PBT

z

It supports 2-antenna and 4-antenna receive diversity to improve the uplink coverage

z

It supports multiple frequency bands, such as PGSM900, EGSM900, and GSM1800

z

It supports the GPRS and EGPRS


Page6

Functions and Features z

When the DRFU is configured, a BTS3900A can support a maximum of 12 carriers in the maximum cell configuration of S4/4/4. In addition, a site configured with the BTS3900As can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12

z

When the GRFU is configured, a BTS3900A can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12. In addition, a site configured with the BTS3900As can support a maximum of 72 carriers in the maximum cell configuration of S24/24/24


Page7



Page8

Contents 2. BTS3900A Hardware Components 2.1 BTS3900A Overview 2.2 BBU Unit 2.3 RF Cabinet 2.4 Power module and Components


Page9

BTS3900A z

The BTS3900A consists of the AC cabinet and DC cabinet

The AC cabinet consists of the APM30H and RF cabinet, and the BBU3900 is installed in the APM30H

The DC cabinet consists of the TMC11H and RF cabinet, the BBU3900 is installed in the TMC11H

The RFUs are installed in the RF cabinet


Page10

Cabinet of BTS3900A Mode

Maximum Power Consumption (W)

Typical Power Consumption (W)

900 MHz

2180

1250

1800 MHz

2480

1400

APM30/ TMC

Configuration Type

Weight (kg)

RF cabinet (DRFUs not involved)

42

RF cabinet (DRFUs involved)

114

APM30 power distribution cabinet (BBU not involved)

54

APM30 power distribution cabinet + RF cabinet

178


RF Cabine t

Page11

BTS3900A AC Cabinet z

The BTS3900A AC cabinet consists of the RF cabinet and the APM30H.

(1) RF cabinet (4) FMUA

(2) RFU (5) DCDU02

(7) BBU

(8) PDU

(10) APM30H

-

(3) FAN unit (6) GATM (9) Power subrack (AC/DC) -


Page12

BTS3900A AC Cabinet z

BTS3900A consists of one RF cabinet, one APM30H, one TMC11H, and one IBBS200T

(1) RF cabinet

(2) RFU

(3) FAN unit

(4) FMUA

(5) DCDU-02

(6) GATM

(7) BBU

(8) PDU

(9) Power subrack (AC/DC)

(10) APM30 H (13) TMC11 H

(11) DCDU03A (14) Battery

(12) Transmission unit (15) IBBS200T


Page13

BTS3900A DC Cabinet z

BTS3900A DC cabinet consists of one RF cabinet and one TMC11H

(1) RF cabinet

(2) RFU

(3) FAN unit

(4) FMUA

(5) DCDU-02

(6) GATM

(7) BBU

(8) DCDU-06A

(9) TMC11H


Page14

Logical Structure


Page15

Contents 2. BTS3900A Hardware Components 2.1 BTS3900A Overview 2.2 BBU Unit 2.3 RF Cabinet 2.4 Power module and Components


Page16

BBU z

The typical power consumption of BBU is 35W

z

The weight of the BBU is 12 kg at most

z

All the boards can be inserted from the front panel

z

The permissible range of power input is –38.4 V DC to –57 V DC


Page17

Working Principles of the BBU


Page18

Boards and Modules in BBU z

BSBC: The universal BBU Subrack Backplane type C

z

GTMU: The GSM Transmission, Timing and Management Unit

z

UBFA: The Universal BBU Fan unit type A

z

UPEU: The Universal Power and Environment interface Unit

z

UELP: The Universal E1/T1 Lightning Protection unit

z

UEIU: The Universal Environment Interface Unit


Page19

BSBC Board z

The BSBC provides slot 6 for the GTMU, slot 7 for a main control board that 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

z

Provide backplane interfaces, communication channels, distribute clock signal and +12V power supply for the other boards


Page20

GTMU z

Controls, maintains, and operates the BTS

z

Monitors the fan module and the power supply module

z

Distributes and manages BTS clock signals

z

Provides the Ethernet port for terminal maintenance

z

Supports four routes of E1 inputs

z

Provides the CPRI ports for communication with the DRFU


Page21

GTMU Ports Label

Connector Type

Description

CPRI0CPRI5

SFP

Ports 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

RJ45

A reserved port that performs the following function: Connects the BBU to a routing device in the equipment room through the Ethernet cable to transmit network information.

FE1

DLC

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

USB

USB

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

TST

USB

Provids a reference clock for the tester.

E1/T1

DB26 female

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

FE0


Page22

GTMU Indicators LED

RUN

Color

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 0.125s OFF for 0.125s

The board is loading software.

ON

A fault occurs in the running board.

OFF

No alarm is generated.

ON

The board is operational.

OFF

The board is faulty.

ON

This link is not used.

ON for 0.125s OFF for 0.125s

A remote E1/T1 alarm is generated.

OFF

This link is operational.

Green

ON

The CPRI link is normal.

Red

ON

The reception of the optical module is abnormal and an alarm is generated.

Green

Red

ACT

Green

CPRI0CPRI5

Description

ON

ALM

LIU0-LIU3

Status

Green


Page23

UELP z

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

GTMU

Port INSIDE

OUTSIDE

Type DB25 male

DB26 male

Relative cables

Description

E1 transferring cable

Transfers the four E1/T1 signals between the UELP and the GTMU

E1/T1 cable

Provides the input and output of the four E1/T1 signals between the BBU and the BSC


Page24

UPEU z

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 RJ45

Transmitting two RS485 environment monitoring signals

MON1 RJ45

Transmitting two RS485 environment monitoring signals

EXTALM0

RJ45

Transmitting four dry contact alarms

EXTALM1

RJ45

Transmitting four dry contact alarms

PWR

3V3

+24 V/-48 V DC power input


Page25

UEIU z

UEIU is the environment interface board of BBU，it can support multi-route monitoring signal input

z

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

Label

Connector Type

Description

MON0

RJ45

One RS485 signal

MON1

RJ45

One RS485 signal

EXTALM0

RJ45

Four dry contact signals

EXTALM1

RJ45

Four dry contact signals


Page26

Monitoring System


Page27

USCU z

The Universal Satellite Card and Clock Unit (USCU) is compatible with six types of 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 port

Connected to the BITS clock; supporting adaptive input of the 2.048 MHz and 10 MHz clocks

4 TEST port

Used for testing the clock


Page28

UBFA z

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

z

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

STAT E

Color

Red /Green

Status

Description

0.125s ON, 0.125s OFF (Green)

The module is not registered, and no alarm is reported.

1s ON, 1s OFF (Green)

The module is running properly.

1s ON, 1s OFF (Red)

The module is reporting alarms.

OFF

The module is powered off or the program is not loaded.


Page29

BBU Cables Connection z

BBU cables connection between BBU, BSC, RFU and Auxiliary equipment


Page30

BBU Hardware structure-Review z

Please fill the board’s name in the blank of the BBU panel


Page31

Contents 2. BTS3900A Hardware Components 2.1 BTS3900A Overview 2.2 BBU Unit 2.3 RF Cabinet 2.4 Power Cabinet


Page32

RF Cabinet z

RF Unit

DRFU

GRFU

z

DCDU-02

z

FAN Unit

z

FMUA

z

Door Sensor


Page33

RF Unit z

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

z

One Double Radio Frequency Unit (DRFU) provides 2 TRXs.

z

One GSM Radio Frequency Unit (GRFU) provides a maximum of 6 TRXs.


Page34

Main Functions of DRFU z

One double radio filter unit (DRFU) provides two TRXs

z

The DRFU performs modulation and demodulation between baseband signals and RF signals, processes data, and combines and divides signals


Page35

Working Principles of the DRFU z

The DRFU consists of the high-speed interface unit, signal processing unit, power amplifier, and dual-duplexer


Page36

Ports of the DRFU Type Port for transmitting and receiving RF signals

CPRI port

Connector

Ports ANT1

N female connector

SFP female connector

ANT2

QMA female connector

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

CPRI1

Used in connection to the lower-level cascaded DRFU

RX1 out RX2 in RX2 out

Power port

7W2 power connector

Used in connection to the antenna subsystem

CPRI0

RX1 in Port for transmitting RF signals between DRFUs

Description

PWR

Input port for diversity signals in antenna channel 1 Output port of diversity signals in antenna channel 1 Input port for diversity signals in antenna channel 2 Output port of diversity signals in antenna channel 2 Receives power input


Page37

LEDs of the DRFU LED

RU N

ALM

ACT

Color

Green

Red

Green

Status

Description

On

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

Off

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

On for 1s Off for 1s

The module is functional.

On for 0.125s Off for 0.125s

The module is loading data.


A fault alarm is generated.

Off


On

A fault alarm is generated, need to chang another module.

On

The module is functional and is correctly connected to the BBU.

Off

The connection with the BBU is not established.


The DRFU is being tested on the Site Maintenance


Page38

LEDs of the DRFU VSWR

CPRI0

CPRI1

Red

Red Gree n

Red Gree n

Off

No VSWR alarm is detected.


The VSWR alarm is generated only on the ANT2 port.

On for 0.125s Off for 0.125s

The VSWR alarms are generated on the ANT1 and ANT2 ports.

On

The VSWR alarm is generated only on the ANT1 port.

On (green)

The CPRI link is functional.

On (red) On for 1s Off for 1s (red) On (green)

The interface module fails to receive signals.

On (red) On for 1s Off for 1s (red)

The CPRI link has a loss-of-lock error. The CPRI link is functional. The interface module fails to receive signals. The CPRI link has a loss-of-lock error.


Page39

Question z

If the ‘VSWR’ is always on, what does it mean? Can you describe the Impact on the system and the reasons?

z

It means only ANT1 have VSWR Alarm. Once the alarm is generated, the service carried by the TRX is totally interrupted.

z

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.


Page40

Output power of DRFU Working Band

PGSM 900 MHz EGSM 900 MHz

GSM 1800 MHz

Frequency Range

PGSM: •TX: 935-960 MHz •RX: 890-915 MHz EGSM: •TX: 925-960 MHz •RX: 880-915 MHz

TX: 1805-1880 MHz RX: 1710-1785 MHz

Working Mode

Output Power (GMSK/8PSK)

Noncombination

45 W/30 W

Combination

20 W/14 W

PBT

71 W/47 W

Noncombination

40 W/26 W

Combination

18 W/12 W

PBT

63 W/42 W


Page41

DCDU-02 Module z

The direction current distribution unit (DCDU) provides -48 V DC power (four outputs)

Receiving -48 V DC power input

Providing -48 V DC power for boards and modules in the cabinet

DCDU-02 (four outputs) on the left

DCDU -02 (four outputs) on the right Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Page42

Fan Module z

The fan module performs the heat dissipation for the cabinet.

One fan module is installed with two fans.

Provides forced ventilation and heat dissipation.

Supports the temperature detection.


Page43

FMUA Board z

The FMUA is a fan environment monitoring unit.

Leading -48 V DC power supply to the cabinet and supplying -48 V DC power supply for the fan module. Collecting environment alarm information in the cabinet. The environment alarm is classified into temperature alarm, humidity alarm, smoke alarm, water immersion alarm, and door status alarm. Supporting the detection and reporting of the temperature.


Page44

FMUA LEDs LED

Color

Description

Status Blinking once every two seconds

RUN

ALA RM

Gree n

Red

Indicates the running status of the board

Indicates whether there are alarms

Blinking four times per second

Description The board is running normally and the communication with the BBU is normal. There is power supply but the communication with the BBU is abnormal.

Off

No power input is available.

Blinking four times per second

There are alarms from both the fans on the left and right half subracks.

Blinking once every two seconds

There is an alarm from the fan on the right half subrack.

On

There is a alarm from the fan on the left half subrack

Blinking once every four seconds

Other alarms

Off

No power input is detected.


Page45

FMUA Ports Type Power port

RS485 port

Ports

7W2 power connector

–48 V DC power input

COM IN

RJ45 connector

Used in connection to the BBU or the monitoring port on the upper-level FMUA

COM OUT

RJ45 connector

Used in connection to the lower-level FMUA

TEM

RJ45 connector

Cabinet temperature monitoring port

TEM_HUM ARRESTER

RJ45 connector

Used in connection to the surge protection failure alarm port of the power distribution unit

4-pin connector

Used in connection to the fan module on the left half subrack

4-pin connector

Used in connection to the fan module on the right half subrack

FAN1 FAN2 FAN3

Boolea n port

Description

-48 V

FAN0 Fan port

Connector

The first group (from left to right) The second group The third group The fourth group

Dry contact connectors Dry contact connectors Dry contact connectors Dry contact connectors


Extended Boolean ports Smoke sensor port, door status sensor port Water sensor ports

Page46

Door Status Sensor z

The door status sensor detects the opening and closing of the cabinet door. It consists of two parts, the magnet part and the switch part.

Magnet part Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Switch part Page47

Contents 2. BTS3900A Hardware Components 2.1 BTS3900A Overview 2.2 BBU Unit 2.3 RF Cabinet 2.4 Power Cabinet


Page48

Power Cabinet – APM30H z

GATM

z

Power Subrack(AC/DC)

z

PDU

z

APMI

z

AFMU

z

Heater

z

Battery

z

Door Status Sensor

z

Temperature Sensor


Page49

APM30 Overview z

The APM30 provides –48V DC power and power backup for the distributed base stations and mini base stations, and provides space for the user equipment. It also performs functions such as battery management and monitoring, and lightening protection 1. Filler panel (1U) 2. Power subrack (3U) 3. DC PDU (2U) 4~8. 1U Filler panel 9. Space for batteries (3U)


Page50

Main Functions of GATM z

The GSM antenna and TMA control module (GATM) is a module that 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


Page51

Ports on the GATM Ports

Connector

Function

ANT0 ANT2 ANT4

SMA female

ANT1 ANT3 ANT5

SMA female Providing power for the antenna

COM1

RJ45

Used in connection to the BBU

COM2

RJ45

Providing the extended RS485 port to be cascaded with other devices

-48 V

7W2

Receiving the -48 V power input

Providing power for the RET antenna and transmitting control signals for the RET antenna


Page52

Power Subrack (AC/DC) z

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

z

The power subrack (AC/DC) converts the 220 V AC power to the 48 V DC power.

1) PMU 2) PSU 3) Wiring unit


Page53

Main Functions of PMU(AC/DC) z

The Power and Environment Monitoring Unit (PMU) provides a comprehensive 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. 2. 3. 4. 5.


LEDs Power supply test ports RS232/RS422 ports Battery control switch COM port

Page54

Ports of PMU Ports

Function

RS232/RS422 port

Used in communication with the central processing unit

Battery switch

The battery switch has two control ports ON and OFF, which are used for switching on and switching off the battery Press and hold the port ON for 5-10 seconds to switch on the battery Press and hold the port OFF for 5-10 seconds to switch off the battery

Power supply test port

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

COM port

Used in connection to the external signal transfer board

Backplane port

Used in connection to the backplane


Page55

Main Functions of PSU(AC/DC) z

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

z

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 2 3


1 Power running LED 2 Protection LED 3 Fault LED

Page56

Power Subrack (AC/DC)—Wiring Unit z

The wiring unit is connected to the external power supply through the terminals L and N wires, and leads the power to the PSU (AC/DC) through the backplane.

z

The PSU (AC/DC) converts the input AC power into the -48 V DC power.

z

The DPMU monitors the operating status of the PSU (AC/DC).

z

The wiring unit provides -48 V DC power outputs through LOAD1(-), LOAD2(-), and RTN(+).


Page57

PDU Module z

The PDU (Power Distribution Unit) performs AC or DC power distribution

Supplies two AC power outputs with the maximum current of 10 A to the heaters of the power cabinet and the heating film of the battery cabinet

Provides 10 DC power outputs to meet the DC power requirements of the distributed base station or the separated base station

Reports the surge protection alarms of the AC or DC output power


Page58

PDU Ports SN 1

Description For the 110 VAC dual-live-wire input, use L2 For the single-phase 220 VAC/three-phase 220 VAC input, use N1 and N2

2

For the 110 VAC dual-live-wire input, use L1

3

For the single-phase 220 VAC/three-phase 220 VAC input, use L1, L2 and L3 AC output wiring terminals (Lout1, Lout2)

4

AC output wiring terminals (Nout1, Nout2)

5

AC input MCB

6

AC output MCB (controls the power supply to the heating film or heaters)

7

DC output MCBs (SW0-SW9)

8

DC output wiring terminals (LOAD0-LOAD9)


Page59

APMI Board z

The APMI board refers to APM Power Monitor unit Interface board

Transfers the APM30 serial port communication signals, Boolean input/output signals, and EMI signals.

Protects the dry contact input/output signals and RS485 signals (connected to the BBU/BTS)


Page60

APMI Ports Port

Connector Type

Quantity

Function

RS422

RJ45 connector

1

Connecting the monitoring signal cable between the PMU and the APMI

TX+, TX-, RX+, RX-

2-pin molex connector

2

Connecting the monitoring signal cable between the APMI and the BBU

IN1-IN3


3

OUT1


1

Connecting the dry contact alarm input cable Connecting the optical coupling alarm output cable


Page61

AFMU Board z

Provides DC power supply to the APMI and AFMU boards through the DC power port

z

Supplies DC power to the two fans at the top of the cabinet and reports the alarms of the fans

z

Reports the alarms of the internal ambient temperature sensor, air inlet temperature sensor, and air outlet temperature sensor


Page62

AFMU Ports and LEDs SN

Port

Function

1

ALM

Connecting the monitoring signal cable between the AFMU and the APMI

2

DC INPUT

Connecting the DC power cable of the AFMU

LED

Silkscreen

Color

Status ON steady

Operatio n LED

Alarm LED

RUN

ALM

Green

Red

1s ON and 1s OFF 0.125s ON

Description About 1 minute after the AC or DC power-on The system is working properly.

0.125s OFF

The serial port communication is disrupted. The other communication is normal.

OFF steady

The system is not powered on.

ON steady

An alarm is generated.

OFF steady

No alarm is generated, or the system is not powered on.


Page63

Heater z

The heater functions in the low-temperature environment to provide suitable working temperature for the batteries in the power cabinet or transmission cabinet.

z

When the internal temperature of the cabinet is lower than 5℃, the heater starts to work; when the internal temperature is higher than 15℃, the heater stops working.


Page64

Battery z

The power cabinet can house 1 to 3 groups of -48 V 12 AH batteries, which can form the -48 V 12 AH battery group system, the -48 V 24 AH system, or the -48 V 36 AH system.


Page65

Door Status Sensor z

The door status sensor is made up of two parts, the magnet part and the switch part.


Page66

Temperature Sensor z

The temperature sensors of the APM30 consist of the air inlet temperature sensor, internal ambient temperature sensor, and the air outlet temperature sensor


Page67

Question z

Would you please describe Power Distribution Modes of BTS3900A?


Page68

IBBS200T Overview z

The IBBS200T provides long-time backup power for the BTS3900A. It is used outdoors.


Page69

TMC z

The TMC can accommodate the transmission equipment of the user. It is used outdoors.

1 Filler panel 3 HEUA 5 Outer air circulation fan

2 Inner air circulation fan 4 DCDU03 6 Core of the heat exchange


Page70



Page71

BTS3900A Signal Flow z

The signal flow of the BTS3900A consists of the traffic signal flow and the signaling flow of the BTS.

DL traffic signal flow

UL traffic signal flow

Signaling flow


Page72

Traffic Signal Flow z

The DL traffic signal flow is transmitted from the BSC to the MS through the BTS3900A. The BBU and RFUs work together to process the DL traffic signals

z

Opposite to the DL traffic signal flow, the UL traffic signal flow is transmitted from the MS to the BSC through the BTS3900A. The BBU and RFUs work together to process the UL traffic signals

BS C BBU E 1

DBUS CBUS FHBU S CPRI

DRFU


R F

Page73

Signaling Flow z

This describes the BTS3900A signaling flow on the Abis interface. The BBU serves as the control unit and works with the RFUs to process the signaling.

DBUS CBUS FHBUS

BSC

E1

BBU


CPRI

DRFU

Page74



Page75

Contents 4. Configurations of the BTS3900A 4.1 Configuration Principle 4.2 Antenna Mode 4.3 Transmit Mode and Receive Mode 4.4 Typical Configuration


Page76

Basic Configuration Principles z

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

z

The GRFU supports a maximum of six carriers and it is applicable to large-capacity scenarios.

z

The DRFU and GRFU can be configured in the same cabinet or cell to support flexible capacity expansion.

z

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.


Page77

Antenna Configuration Principles z

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

z

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.

z

Each sector of the BTS must be configured with the minimum number of antennas.

z

For the 2-way RX diversity, each sector has two antenna channels; for the 4-way RX diversity, each sector has four antenna channels.


Page78

DRFU Configuration Principles z

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

z

When the DRFU works in TX PBT, TX diversity, or 4-way RX diversity mode, a DRFU provides only one TRX.

z

When only DRFU are configured, One BTS3900A can support a maximum of 12 carriers in the maximum cell configuration of S4/4/4. A site configured with the BTS3900As can support a maximum of 36 carriers in the maximum cell configuration of S12/12/12


Page79



Page80

DRFU Antenna Mode z

z

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


Page81

Signal Feeder TX/RX

Single Feeder (1TX + 1RX)


TX/RX

TX/RX

Single Feeder (1TX + 2RX)

Page82

Double Feeder TX

RX

TX/RX

Double Feeder (1TX + 1RX)


RX


Page83

Double Feeder TX/RX

TX/RX

TX/RX TX/RX



TX/RX TX/RX


Page84



Page85

Transmit Mode and Receive Mode z

z

DRFU transmit mode

Transmit independency or combining

PBT

Dynamic PBT

Diversity transmitter

DRFU receive mode

Main diversity receiver

Four diversity receiver


Page86

DRFU Internal Structure z

2 TRXs and 2 duplexers are integrated in DRFU module which can be connected to antenna directly

z

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

CPRI-1

Interface Processing Unit

CPRI-0

DUP

ANTA

ANTB DUP

RX-IN RX_OUT


Page87

Transmit Independency z

In transmit independency mode, TRX0 occupies channel A while TRX1 occupies channel B

CPRI1


CPRI0


DUP

ANT1

DUP

ANT2

Page88

Transmit Combining z

In transmit combining mode，the two TRXs are combined and transmitted through channel A

CPRI1


CPRI0


DUP

ANT1

DUP

ANT2

Page89

PBT z

In PBT mode, only the TRX0 can work

z

PBT mode can improve the transmitting power

z

In PBT mode，only channel A is used by downlink signal

CPRI1


CPRI0


DUP

ANT1

DUP

ANT2

Page90

Dynamic PBT z

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

z

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


Page91

The Principle of Dynamic PBT Timeslots

TRXs

Poor quality Good quality

No signal

Signal quality


Page92

Transmit Diversity z

In Transmit diversity mode, only the TRX0 can work

z

Transmit diversity mode improves the quality of downlink signal

z

In Transmit diversity mode，the signal from the TRX0 is divided to 2 channels and be transmitted through ANTA and ANTB

CPRI1


CPRI0


DUP

ANT1

DUP

ANT2

Page93

Question z

When configuring ‘Transmit Mode’, ‘Transmit Independency or Combining ’ can be chosen. How can we know whether ‘Transmit Independency’ or ‘Transmit Combining’ is used?

z

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’


Page94

Main Diversity receiver z

In this mode，both of the 2 TRXs can work

z

Each TRX receives the signal from 2 feeders

z

In the following figure，the TRX gets the receiving signal from channel A and B of the single DRFU

z

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

CPRI1


CPRI0

DUP

ANT1

DUP

ANT2 RX-IN RX_OUT


Page95

If only one ANT channel is used, TRX can also use the ANT channel of other DRFU through RX-in to ensure 2 way receiving

Four Diversity Receiver z

In this mode, only the first TRX can work

z

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

CPRI1


CPRI0

DUP

ANT1

DUP

ANT2 RX-IN RX_OUT

CPRI1


CPRI0

DUP

ANT1

DUP

ANT2 RX-IN RX_OUT


Page96

Cable connection for sharing the receiving signals

Receiver Sensitivity of BTS3900A z

The following table lists the static receiver sensitivity of the BTS3900A Receive Mode

Receive independency Two-way receive diversity Four-way receive diversity

Operating Frequency Band

Static Sensitivity (Typical Value)

900 MHz

-113 dBm

1800 MHz

-113 dBm

900 MHz

-116 dBm

1800 MHz

-116 dBm

900 MHz

-118.5 dBm

1800 MHz

-118.5 dBm


Page97



Page98

DRFU S1/S2 Configuration z

z

z

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





Page99

DRFU S2/S3/S4 Configuration z

z

S2 Configuration

TX mode: PBT


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

S3/S4 Configuration





Page100


S5/S6 Configuration



Antenna mode

DRFU0: Single antenna(1TX+2RX)


DRFU2: Double antenna(1TX+2RX)


Page101


S7/S8 Configuration





Page102

DRFU S3/3 Configuration z

S3/3 Configuration



Antenna mode


DRFU1: Double antenna(2TX+4RX)



Page103



Page104

BTS Star Topology z

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

z

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


Page105

BTS Chain Topology z

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

z

The chain topology reduces cost in transmission equipment, construction, and transmission link lease


Page106

BTS Tree Topology z

The tree topology applies to areas where network structures, site distribution, and subscriber distribution are complicated

z

The tree topology requires fewer transmission cables compared with the star topology


Page107

BTS Ring Topology z

The ring topology applies to common scenarios. Due to its strong self-healing capability, the ring topology is preferred if permitted by the routing

z

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 despite the breaking point; thus improving the robustness of the system


Page108

DRFU Topologies Configuration z

The DRFU supports various network topologies: star, chain, and ring


Page109



Page110

Introduction of GRFU z

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

GRFU performs modulation and demodulation between baseband signals and RF signals, processes data, and combines and divides signals.

z

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.


Page111

Multi-carrier Technology z

The principle of multi-carrier technology: multiple carriers share one power amplifier and one RF channel.

z

Baseband pool replaced independent baseband unit. Improve the integration.

z

Digital IF combination replaced Analog RF combination. There isn’t combination loss.

Single-carrier Technology Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Multi-carrier Technology Page112

Ports of GRFU Port Type

Port for transceiving RF signals

Label

Description

ANT_RX B

DIN connector

ANT_TX/ RXA

DIN connector

CPRI0

SFP female connector

Connecting to the BBU, or the upper-level RFU during the cascading.

SFP female connector QMA female connector QMA female connector 3V3 power connector

Connecting to the lower-level RFU during the cascading.

CPRI CPRI1

Interconnection port for RF receive signals

Connector Type

RX_INB RX_OUT A

Power supply port

PWR

Monitoring port

MON

RJ45 connector

Connecting to the antenna subsystem.

Input port of diversity signals in the antenna channel. Output port of diversity signals in the antenna channel. Feeding power. Monitoring port.


Page113

LEDs of GRFU LED

RUN

ALM

ACT

VSW R

Color

Green

Red

Status

Description

ON

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

OFF

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

1s ON 1s OFF 0.2s ON 0.2s OFF 1s ON 1s OFF

The software is being loaded to the module.

OFF


ON

The module is functional and is correctly connected to the BBU.

OFF

The connection with the BBU is not set up.

OFF

No VSWR alarm is generated.

ON

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

Green

The module is running properly.

A fault alarm is generated.

Red


Page114

LEDs of GRFU

CPRI 0

CPRI 1

Red Gree n

Red Gree n

ON (Green)


ON (Red)


1s ON 1s OFF(Red)

The CPRI link is out of lock.

ON (Green)


ON (Red)


1s ON, 1s OFF (Red)

The CPRI link is out of lock.


Page115

Compare GRFU with DRFU Port Type

GRFU

Port for

ANT_TX/RX A

transceiving

ANT_RXB

Relative position

DRFU

Relative position

lower

ANT1

upper

upper

ANT2

lower

CPRI0

lower

CPRI0

upper

CPRI1

upper

CPRI1

lower

RF signals CPRI Interconnectio n

Rx_1 in RX_INB

upper Rx_1 out

port for RF Receive

RX_OUTA

lower

Rx_2 out

signals Monitoring port

Rx_2 in

MON

existence

Non existence


Page116

Output power of GRFU z

The output power of different configuration is also configured differently Output power Frequency bands

PGSM 900MHz / GSM1800MHz

S1

（GMSK/8PSK ） 80W/53W

S2

40W/26W

S3

31W/20W

S4

27W/17W

S5

18W/12W

S6

16W/10W

Configuration


Page117

Limitation of GRFU z

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.

z

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.

z

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


Page118

Configuration Principle of GRFU z

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

z

When the GRFU is configured, a single BTS3900A provides a maximumof 36 carriers with the maximum cell configuration of S12/12/12. In addition, a site configured with the BTS3900As can support a maximum of 72 carriers, with the maximum cell configuration of S24/24/24.

z

One GRFU does not serve two cells.

z

Each cell with a single antenna can be configured with a maximum of two GRFUs.


Page119

Transmit Mode and Receive Mode of GRFU z

GRFU Transmit Mode

z

Transmit independency or combining

GRFU Receive Mode

Main diversity receiver


Page120

GRFU S2-S6 Configuration z

S2-S6 Configuration





Page121

GRFU S7-S12 Configuration z

S7-S12 Configuration





Page122

DRFU＆GRFU Configuration z

DRFU＆GRFU Configuration



Antenna mode:

GRFU: Single antenna(1TX+2RX)

DRFU: Single antenna(1TX+2RX)


Page123

DRFU＆GRFU Configuration z

DRFU＆GRFU Configuration



Antenna mode:

GRFU: Double antenna(1TX+2RX)

DRFU: Double antenna(1TX+2RX)


Page124

Summary z

BTS3900A functions and features

z

BTS3900A hardware structure, including RF cabinet, APM30 and components

z

Working mode, configuration principles, RF cable configurations, typical configurations

z

BTS networking topology and RFU connection


Page125

Ome501102 Huawei Bts3900a Hardware Structure Issue2.00

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