8 Huawei Bts3900 Hardware Structure 5160n

HUAWEI BTS3900 Hardware Structure www.huawei.com

GSM BSS Training Team Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Foreword 

The BTS3900 developed by Huawei is an indoor macro BTS. The BTS3900 mainly consists of the BBU and DRFUs. Compared with traditional BTSs, the BTS3900 features simpler structure and higher integration.



In this slide, we’ll mainly introduce the hardware system structure, application scenarios, basic functions of modules, networking mode and typical configuration of the BTS3900

Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page2

References 

《 BTS3900 System Description 》



《 BTS3900 Hardware Description 》


Page3

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


Page4

Contents 1. BTS3900 Overview 2. BTS3900Hardware Components 

2.1 BTS3900 basic structure



2.2 BBU hardware structure



2.3 Power supply system of BTS3900



2.4 Other boards and modules



2.5 Cables connection of the cabinet

3. Configurations of the BTS3900 

3.1 Key parameters in BTS3900 configuration



3.2 Typical configuration



3.3 RF cable connection configuration



3.4 Topology configuration



3.5 Configuration principles


Page5

Contents 1. BTS3900 Overview 2. BTS3900 Hardware Components 3. Configurations of the BTS3900


Page6

Location of BTS3900 Um Interface

MS

BTS3900

BSC A Interface

MS

MSC/VLR M AP MAP

BTS3900

HLR/AUC/EIR

BTS MS

BTS3900

PSTN ISDN PSPDN

TUP,ISUP

SMC/VM

OMC

MS: Mobile Station

BTS: Base Transceiver Station

BSC: Base Station Controller

HLR: Home Location

AUC: Authentication Center

EIR: Equipment Identity

MSC: Mobile Switching Center

VLR: Visitor Location

SMC: Short Message Center

VM: Voice Mailbox

OMC: Operation and Maintenance Center


Page7

Some Functions and Features 

It adopts the unified BTS platform developed by Huawei Wireless and enables the smooth evolution from 2G to 3G.



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



It shares the BBU, which is the central processing unit, with the DBS3900 to minimize the number of spare parts and reduce the cost.



It can be flexibly installed in a small footprint and easily maintained with low cost.



It s transmit diversity and PBT.



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



It s the GPRS and EGPRS.


Page8

Some Functions and Features 

It s the hierarchical cell, concentric cell, and micro cell.



It s multiple network topologies, such as star, tree, chain, ring, and hybrid topologies.



It s the A5/3, A5/2, and A5/1 encryption and decryption algorithms.



It s coexistence with the BTS3012.



A single cabinet s up to 12 carriers in the maximum cell configuration of S4/4/4.



Multiple cabinets up to 72 carriers in the maximum cell configuration of S24/24/24.



Receiver sensitivity on TCH/FS is -113 dBm


Page9

Contents 1. BTS3900 Overview 2. BTS3900 Hardware Components 3. Configuration of the BTS3900


Page10

Contents 

2. BTS3900 Hardware Components 

2.1 BTS3900basic structure














Page11

Structure of the BTS3900 Cabinet

(1) Double radio filter unit (2) Fan box (3) GSM antenna and TMA control module (4) Baseband unit (5) Direct current distribution unit

-48V Cabinet Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page12

Structure of the BTS3900 Cabinet (1) Double radio filter unit (2) Fan box (3) Baseband unit (4) Direct current distribution unit (5) Cable in/out unit (6) Power supply unit

+24V or +220V Cabinet Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page13

Abbreviations Board/ module

Full Name

Quantity Full Configuration

Minimum Configuration

BSBC

Universal BBU Subrack Backplane type C (2U)

1

1

UEIU

Universal Environment Interface Unit

1

0

GTMU

GSM Transmission and Management Unit for BBU

1

1

UELP

Universal E1/T1 Lightning Protection Unit

1

0

UBFA

Universal BBU Fan unit type A (2U)

1

1

UPEU

Universal Power and Environment interface Unit

2

1

DRFU

Double Radio Filter Unit

6

1

DCDU

Direct Current Distribution Unit

1

1

GATM

GSM Antenna and TMA Control Module

1

0

DPMU

Power and Environment Monitoring Unit

1

0

PSU(AC/DC)

Power Supply Unit (AC/DC)

3

0

PSU(DC/DC)

Power Supply Unit (DC/DC)

4

0

Fan box

Fan box

1

1


Page14

Logical Structure and Signal Flow


Page15

Stack Mode 

When two BTS3900cabinets (-48 V) are stacked, the BBU is installed only in the lower cabinet and serves as the baseband control unit for the two cabinets.


Page16

Stack Mode 

When the BTS3900 cabinet (-48 V) is stacked on the BTS3900 cabinet (220 V or +24V), a maximum of nine DRFUs can be configured.



When two cabinets are stacked, the BBU is installed only in the lower cabinet and serves as the baseband control unit for the two cabinets.


Page17

Contents 
















Page18

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



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


Page19

Working Principles of the BBU




Page20

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


Page21

BSBC Board The BSBA provides slot 6 for the GTMU, slot 7 for a main control



board that s 3G, and slots 0 to 5 as common slots. The GTMU is 1 U high. Therefore, from the view of the front , 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


Page22

GTMU 

Controls, maintains, and operates the BTS

s fault management, configuration management, performance management, and security management 



Monitors the fan module and the power supply module



Distributes and manages BTS clock signals



Provides clock input for testing



Provides the Ethernet port for terminal maintenance



s four E1 inputs



Provides the RI ports for communication with the DRFU


Page23

GTMU

The ports on the GTMU



Port

Type

Corresponding cable

Description

RI0 ～ RI5

DLC

Optical fiber between BBU and DRFU

Connected to DRFU for the optical signal transmission

ETH

RJ45

Special Ethernet cable

Terminal maintenance and commissioning

FE0

RJ45

Ethernet cable

A reserved port that performs the

FE1

DLC

Optical fiber

following function: Connects the BBU to a routing device in the equipment room through the Ethernet cable for transmission

USB

USB

-

A reserved port that performs the following function: Automatically upgrades the software through the USB disk

TEST

USB

-

Tests the output clock signals with a tester


E1/T1

DB26

BBU E1/T1

Page24 Provides the input and output of the four

GTMU 

GTMU indicators

Indicato r RUN

ALM ACT LIU0~LI U3

Color

Status

Description

Green

On

Board has fault

Green

Of

Not power input or the board is faulty

Green

Slow flash(1s on ， 1s of)

The board is operational.

Green

Slow flash (2s on ， 2s of)

OML is abnormal

Green

Fast flash (0.125s on, 0.125s Board is loading software of)

Red

On

A fault occurs in the running board.

Of

No fault

On

The board is operational.

Of

Board has fault

On

E1/T1 local alarm

Green Green

Fast flash (0.125s on, 0.125s E1/T1 remote alarm of) Of

Not used or alarm has disappeared

RI0~ Green On RI link is functional RI5 © 2006 Copyright Red Huawei OnTechnologies Co., Ltd. All rights reserved. RI link Page25 is abnormal

GTMU GTMU toggle switch



Toggle switch

SW1

Status Description

1

2

ON

ON

The E1 impedance is set to 75 Ω.

OFF

ON

The E1 impedance is set to 120 Ω.

ON

OFF

The T1 impedance is set to 100 Ω.

Status Toggle switch

SW2

Description

1

2

3

4

ON

ON

ON

ON

The E1 cable is grounded.

OFF

OFF

OFF

OFF

The E1 cable is not grounded.


Page26

GTMU GTMU toggle switch



Toggle switch SW4

Toggl e switc h SW5

Status 1

2

Description 3

4

ON

ON

ON

ON

The E1 link can be byed.

OFF

OFF

OFF

OFF

The E1 link cannot be byed.

Status

Description

1

2

3

4

ON

ON

ON

ON

OFF

ON

ON

OFF The E1 link of the Level 1 cascaded BTS can be byed.

ON

OFF

ON


OFF

OFF

ON


ON

ON

OFF

OFF The E1 link of the Level 4 cascaded BTS can be

The E1 link cannot be byed.

Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. byed.

Page27

UBFA 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. The UBFA module communicates with the GTMU to regulate the



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

Color

Status

Description

STATE Green Fast Can not flash(0.25s communicate with on ， 0.25s of) the board and there is no alarm generated Red

On

Green Slow flash(1s on ， 1s of) Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

There is alarm Runs normally

Page28

UPEU The universal power and environment interface unit type A (–48 V) (UPEU)



s the –48 V 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

MON 0

RJ45

Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol

MON 1

RJ45

Reserved

EXTALM0

RJ45

Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry

EXTALM1

RJ45

Reserved

Copyright © 2006 Huawei Technologies Co., Ltd. PWRAll rights 3V3 reserved. -48VPage29 DC input

UEIU UEIU is the environment interface board of BBU ， it



can multi-route monitoring signal input UEIU is optional and is only used when more ports are



needed

Port

Type

Description

MON 0

RJ45

Provides the input and output of the externally collected environment monitoring signals to the GTMU according to the RS485 communications protocol

MON 1

RJ45

Reserved

EXTALM0

RJ45

Transmits the externally collected environment monitoring signals to the GTMU through communications protocol related to the dry

EXTRJ45 Reserved Copyright © 2006 Huawei Technologies Co., ALM1 Ltd. All rights reserved.

Page30

UELP UELP is the E1/T1 signal lightening protection unit of



BBU and it can provide protection for 4 route E1/T1 signal

Port INSIDE

Type

Relative cables

Description

DB25 male

E1 transferring cable

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

OUTSIDE DB26 male

E1/T1 cable

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


Page31

Contents 
















Page32

DCDU

a: Power switch

b: Power output ports


Page33

Main Functions of DCDU 

The functions of the DCDU are:



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 diferential mode and 15 kA in common mode and providing dry for surge protection failure


Page34

Ports and Switches of DCDU Name Power input terminal

Label

Description

NEG(-)

DCDU low level input terminal

RTN(+)

DCDU high level input terminal

Power output port

SPARE2, SPARE1, BBU, FAN, and RFU5RFU0

Power ports supplying the 10 outputs of power to the BBU, DRFU, GATM, and fan box

Power switch

SPARE2, SPARE1, BBU, FAN, and RFU5RFU0

Power switch controlling the 10 outputs for the BBU, DRFU, GATM, and fan box

Alarm output port

SPD ALM

Dry alarm output port


Page35

DPMU and PSU 

The wiring unit is connected to the external power supply through the terminals for L and N wires, and leads the power to the PSU through the backplane.



The PSU converts the input power into the -48 V DC power.



The DPMU monitors the operating status of the PSU.



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

1) DPMU 2) PSU 3) Wiring unit


Page36

Main Functions of PSU 

There are 2 kinds of Power Supply Unit (PSU), AC/DC and DC/DC. AC/DC PSU converts 220V to -48V; DC/DC PSU converts +24V to -48V



The AC/DC and DC/DC PSU monitor alarms related to module faults (such as output overvoltage, no output, and fan faults), alarms related to module protection (such as overtemperature protection, and input overvoltage/undervoltage protection), and power failure alarm


Page37

LEDs of PSU input LED (top)

Green

Power protection LED (middle)

Yellow

Power failure LED (bottom)

Red

On

Normal.

Off

There is no AC power input or the fuse is damaged.

Off

Normal.

On

Power protection for the PSU is being triggered, for example, upon input undervoltage/overvoltage or overtemperature.

Off

Normal.

On

Irrecoverable fault occurs inside the PSU. For example, the fault can be output overvoltage, no outputs, or fan fault.


Page38

Main Functions of PMU 

The power and environment monitoring unit (DPMU)



Communicates with the central processing unit through the RS232/RS422 serial port



Manages the power system and the battery charging and discharging



Detects and reports water damage alarms, smoke alarms, door status alarms, and standby Boolean value alarms; reports ambient humidity and temperature, battery temperature, and standby analog values



Detects power distribution and reports alarms, and also reports dry alarms


Page39

Ports of PMU 1. 2. 3. 4. 5. Ports RS232/RS422 port

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

COM port Backplane port

Used in connection to the external signal transfer board Used in connection to the backplane


Page40

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.


Page41


When the external +24 V DC power or +220V AC power is used, PSUs and 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.


Page42


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.


Page43

Contents 
















Page44

Main Functions of GATM 

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



Controls the RET antenna



Feeds power to the TMA



Reports the RET control alarm signals



Monitors the current from the feeder


Page45

Ports on the GATM Ports

Connector

Function

ANT0

SMA female

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

ANT1

SMA female

Providing power for the antenna

ANT2

SMA female


ANT3

SMA female


ANT4

SMA female


ANT5

SMA female


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


Page46

LEDs on the GATM LED

Color

RUN

Green

ACT

ALM

Green

Red

Description Indicator of the board running status

Status

Meaning

Blinking once every four seconds

There is power supply but the communication with the BBU is abnormal.

Blinking once every two seconds

The board is running normally and the communication with the BBU is normal.

Off

There is no power supply or the module is faulty.

Indicator of the service running status

On

The AISG link is normal.

Off

The AISG link is abnormal.

Blinking frequently and irregularly

The AISG link is transmitting data.

Alarm indicator

On

An alarm is generated, such as an overcurrent alarm.

Off

The module runs normally.


Page47

Features and Functions of Fan Box Provides forced ventilation and dissipation for the cabinet  

s two modes of adjusting the rotation speed of the fans: adjustment based on the temperature and adjustment controlled by BBU



Detects the temperature



Communicates with BBU unit to report alarms and the adjusted rotation speed of the fans to BBU



Stops the rotation of the fans when the ambient temperature is low



A fan box is configured with one NFCB and four fans. The fans are configured in N+1 mode. When one fan fails, the other fans rotate at full speed.


Page48

Connectors and LEDs of Fan Box Type

Silk-Screen

Connector

Power port

-48 V

7W2

Used to introduce the -48 V DC power

Temperature sensor port

SENSOR

RJ45

Used in connection to the external temperature sensor

Communication port

COM OUT

RJ45

Used in connection to the lower-level cascaded fan box

COM IN

RJ45

Used in communication with the central processing unit

LED

Color

RUN

Green

ALM

Red

Description

Status

Description

Blinking four times per second

The communication with the central processing unit is not established but the module runs normally.


The communication with the central processing unit is established and the module runs normally.

Off

There is no power input and the module is faulty.


An alarm is generated.

Off

No alarm is generated.


Page49

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.


Page50

Working Principles of the DRFU 

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


Page51

DRFU Internal Structure 2 TRXs and 2 duplexers are integrated in DRFU module which can be connected to antenna directly The RX_IN/OUT port of DRFU can the receiving signal interconnection between 2 DRFUs, so that it can the diversity receiving between 2DRFUs

RI-W

Interface Processing Unit

RI-E

DUP

DUP

ANTA

ANTB

RX-IN RX_OUT


Page52

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

Port for transmitting RF signals between DRFUs

Power port

Connector

Ports

Description

N female connector

ANT1

SFP female connector

RI0

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

RI1

Used in connection to the lower-level cascaded DRFU

RX1 in

Input port for diversity signals in antenna channel 1

RX1 out

Output port of diversity signals in antenna channel 1

RX2 in

Input port for diversity signals in antenna channel 2

RX2 out

Output port of diversity signals in antenna channel 2

PWR

Receives power input

QMA female connector

7W2 power connector

Used in connection to the antenna subsystem

ANT2


Page53

LEDs of the DRFU LED RUN

ALM

ACT

Status

Meaning

On

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

Off

There is no power supply or the module is faulty.


The module is functional.

Blinking four times per second

The module is loading software or is not started.

On

A fault alarm is generated.

Off

No alarm is generated.

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 Terminal.


Page54

LEDs of the DRFU VSWR

RI0

RI1

Off (red)

No VSWR alarm is detected.

Blinking once every two seconds (red)

The VSWR alarm is generated on only the ANT2 port.

Blinking four times per second (red)

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

On (red)

The VSWR alarm is generated on only the ANT1 port.

On (green)

The RI link is functional.

On (red)

The interface module fails to receive signals.


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

On (green)

The RI link is functional.

On (red)

The interface module fails to receive signals.


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


Page55

Contents 
















Page56

Cable Connection of -48V Cabinet Cable Number

Cable Name

Qua ntity

R1-R12

RF Jumpers

12

P1-P2

External Power Cables (-48 V)

2

P3-P8

Power Cables Between the DCDU and DRFUs

6

P9

Power Cable Between the DCDU and Fan Box

1

P10

Power Cable Between the DCDU and BBU

1

P11-P12

Reserved

2

S1-S6

RI Signal Cables Between the BBU and DRFU

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


Page57

Cable Connection of +24V Cabinet Cable Name

Cable number

Qua ntity

R1-R12

RF Jumpers

12

P1–P2

Power Cables Between the PSU (DC/DC) and DCDU

2

P3-P8

Power Cables Between the DCDU and DRFUs

6

P9

Power Cable Between the DCDU and Fan Box

1

P10

Power Cable Between the DCDU and the BBU

1

P11-P12

Reserved

2

P13-P14

External Power Cables (+24 V)

4

S1-S6


6

S7


1

S8


1

S9

In-Position Signal Cable for the PSU (DC/DC)

1

S10


1

S11


1


Page58

Cable Connection of +220V Cabinet Cable Number

Cable Name

Qua ntity

R1-R12

RF Jumpers

12

P1–P2

Power Cables Between the PSU (AC/DC) and the DCDU

2

P3-P8

Power Cables Between the DCDU and the DRFUs

6

P9

Power Cable Between the DCDU and the Fan Box

1

P10

Power Cable Between the DCDU and the BBU

1

P11-P12

Reserved

2

P13-P14

External Power Cables (220 V)

2

S1-S6


6

S7


1

S8

Monitoring Signal Cable for the DPMU

1

S9


1

S10


1

S11


1


Page59

Contents 1. BTS3900 Overview 2. BTS3900 Hardware Components 3. Configuration of the BTS3900


Page60

Contents 

3. Configuration of the BTS3900 

3.1 Key parameters in BTS3900configuration














Page61

Antenna Modes 

Single antenna 



Single antenna, double receivers 



The DRFU module has 1 working TX/RX feeder and 2 way receive diversity, one of the receiver is from the another DRFU

Double antennas 



The DRFU module has 1 working feeder so there is no receive diversity or transmit diversity

The DRFU module has 2 working TX/RX feeders and 2 way receive diversity

Double antennas, 4 receivers 

The DRFU has 2 working TX/RX feeders and 4 way receive diversity


Page62

DRFU Output Power in the BTS3900 Operating Frequency Band

Work Mode

Output Power (GMSK/8PSK)

900 MHz

Non-combination

45 W/30 W

900 MHz

Combination

20 W/14 W

900 MHz

PBT

71 W/47 W

1800 MHz

Non-combination

40 W/26 W

1800 MHz

Combination

18 W/12 W

1800 MHz

PBT

63 W/42 W


Page63

DRFU Transmit Mode and Receive Mode 



DRFU transmit mode 

Transmit independency or combining



PBT



Transmit diversity

DRFU receive mode 

Two way receive diversity



Four way receive diversity


Page64

DRFU Transmitting Mode Transmit Independency or Combining



In transmit independency or combining mode, the system decides which mode will work actually



In independency mode, TRX 0 occupies channel A while TRX1 occupies channel B

RI-W


RI-E


ANTA DUP

ANTB DUP

Page65

DRFU Transmitting Mode Transmit Independency or Combining



In transmit independency or combining mode, the system decides which mode will work actually



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

RI-W


RI-E


ANTA DUP

ANTB DUP

Page66

DRFU Transmitting Mode - PBT 

In PBT mode, only the first TRX can work



PBT mode can improve the transmitting power



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

RI-W


RI-E


ANTA DUP

ANTB DUP

Page67

DRFU Transmitting Mode Transmit Diversity 

In this mode, only the first TRX can work



Transmit diversity mode improves the quality of downlink signal



In this mode ， the signal from the first TRX is divided to 2 channels and be transmitted through channel A and channel B

RI-W


RI-E


ANTA DUP

ANTB DUP

Page68

  



DRFU Receiving Mode – Two Way Receive Diversity In this mode ， both of the 2 TRXs can work Each TRX receives the signal from 2 feeders In the following figure ， the TRX gets the receiving signal from channel A and B of the single DRFU It is also possible for TRX to use the channel A receiver of another DRFU

Processing

RI-W

Interface Unit

RI-E

ANTA DUP

ANTB DUP RX-IN RX_OUT


Page69

From RX-in, TRX can also use the channel A of the other DRFU, so channel B of the two DRFUs are canceled

DRFU Receiving Mode - Four Way Receive Diversity In this mode, only the first TRX can work

 

The working TRX gets the uplink signal from 4 feeders of 2 DRFUs

2 channels from the other DRFU

RI-W

Interface Processing

RI-E

ANTA

ANTB DUP

RX-IN RX_OUT

RI-W

Interface Processing

RI-E

ANTA

ANTB DUP

RX-IN RX_OUT Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Page70

Contents 
















Page71

Typical Configuration 1 


Page72



Page73



Page74



Page75



Page76

Contents 
















Page77

RF Cable Connection 1 One DRFU module



One dual-polarized



antenna Cell Type ed

TRX Mode

S1 (without transmit diversity)

Transmit Independency or Combining

Double Antenna

S1 (with transmit diversity)

Transmit Diversity

Double Antenna



Double Antenna

Antenna Mode


Page78

RF Cable Connection 2 (1) Two DRFU modules



One dual-polarized



antenna Cell Type ed S2 (PBT)

TRX Mode PBT

Antenna Mode Single Antenna Double Receiver



Single Antenna



Single Antenna

Double Receiver

Double Receiver


Page79

RF Cable Connection 2 (2) Two DRFU modules



One dual-polarized



antenna Cell Type ed

TRX Mode

Antenna Mode

S2 (with transmit diversity)

Transmit Diversity

Single Antenna

S2 (4-way receive diversity)

4-Way Receive Diversity

Single Antenna

S4 (transmit independency)


Single Antenna

Double Receiver

Double Receiver

Double Receiver


Page80

RF Cable Connection 3 Three DRFU modules



Two dual-polarized antennas



Cell Type ed S5 (without transmit diversity)

TRX Mode

Antenna Mode DRFU0: Single Antenna

Double Receiver Transmit Independency DRFU1: Single Antenna or Combining Double Receiver DRFU2: Double Antenna


DRFU0: Single Antenna Transmit Double Receiver Independency DRFU1: Single Antenna or Combining Double Receiver DRFU2: Double Antenna


Page81

RF Cable Connection 4 Four DRFU modules



Two dual-polarized antennas



Cell Type ed

TRX Mode





Antenna Mode Single Antenna Double Receiver Single Antenna Double Receiver


Page82

Contents 
















Page83

BTS3900 Topologies - Star 

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



Advantages 



In the star topology, each site is directly connected to the BSC. It has the following features:



Easy networking



Easy project implementation



Easy network maintenance



Easy network expansion



High network reliability

Disadvantages 

Compared with other topologies, the star topology requires more transmission cables.


Page84

BTS3900 Topologies - Chain 

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



Advantages 

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



Disadvantages 

As signals through many nodes, the transmission reliability in the chain topology is reduced.



The faults in the upper-level BTSs may afect the lower-level BTSs.



The number of levels in a chain network should not exceed five.


Page85

BTS3900 Topologies - Tree 

The tree topology applies to areas where network structures, site distribution, and subscriber distribution are complicated, for example, an area where large-scale coverage overlaps hot spot or small-scale coverage.



Advantages 



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

Disadvantages 







As signals through many nodes, the transmission reliability is reduced. This makes it difficult for maintenance and engineering. The faults in the upper-level BTSs may afect the lower-level BTSs. Capacity expansion is difficult. The number of levels in the tree should not exceed five.


Page86

BTS3900 Topologies - Ring 

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



Advantages 



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.

Disadvantages 

In the ring topology, there is always a link section that does not transfer data.


Page87

DRFU Topologies Configuration 

The DRFU s various network topologies: star, chain, and ring.


Page88

Contents 
















Page89

Basic Configuration Principles 

A single BTS3900/BTS3900A cabinet provides up to 12 carriers with the maximum cell configuration of S4/4/4, and s the dual-band application.



Minimum cost



Smooth upgrade of configuration



Antenna configuration principles



Minimum number of DRFUs



Minimum number of BBUs



Highest reliability



Mode of configuring two TRXs in one sector


Page90

RF Configuration Principles 

A maximum of three levels of DRFUs can be connected to one BBU.



For S4/4/4 cell configuration and lower configurations, the star topology is recommended between the BBU and the DRFU; for the configuration higher than the S4/4/4 cell configuration, the ring topology is recommended between the BBU and the DRFU.



Minimum number of antennas. Each sector of the BTS must be configured with the minimum number of antennas. For the 2-antenna receive diversity, each sector has two antenna channels; for the 4-antenna receive diversity, each sector has four antenna channels.



Non-combination in the transmit channel. The non-combination configuration is recommended for the DRFU to avoid the power loss in combination and to reduce the power consumption of the BTS. If combination is required, the cavity combiner must be configured outside the DRFU and one combination is recommended.


Page91

Configuration Principles of the BBU Minimum number of trunk cables. You can determine 

the number of trunk cables as required, and take the existing configuration for saving transmission resources into in networking. 

Minimum number of UPEUs. The configuration of a single UPEU is recommended. The redundancy backup mode can be configured if required.



One BBU s six RI ports. The star topology is recommended between DRFUs.


Page92

Summary 

BTS3900 functions and features



BTS3900 hardware structure and components



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


Page93

Thank you www.huawei.com

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