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

HUAWEI BTS3900 Hardware Structure

HUAWEI TECHNOLOGIES Co., Ltd. Page 2HUAWEI Confidential

Chapter 1 Chapter 1 BTS3900 BTS3900 Product DescriptionProduct Description

Chapter 2 BTS3900 System Structure


BTS3900 Product Descriptionu The BTS3900 is comprised of the BBU3900, MRFU, and indoor macro cabinet. The

BBU3900 and the MRFU are installed in the indoor macro cabinet. The PS4890 meets the

requirements of different applications when the backup power or transmission equipment

space is required.

BTS3900 system structure PS4890 system structure


Features of BTS3900u Advanced Platform-Based Architecture

Ø Based on the unified hardware platform, the BTS3900 supports three working modes: GSM

mode, GSM+UMTS dual mode, and UMTS mode through configuration of different software.

In addition, the BTS3900 supports smooth evolution to the Long-Term Evolution (LTE).

Ø The RF module integrates the duplexer and the Transceiver Unit (TRU), thus enhancing

integrity of RF parts and meeting future requirements for a compact, high-efficiency, and low-

cost base station.

Ø Supports whole frequency band of PGSM 900MHz, high 45MHz frequency band and low

45MHz frequency band of DCS1800MHz, high 40MHz frequency band and low 40MHz

frequency band of 1900MHz.

u High Capacity

Ø When the BTS3900 works in GSM mode, a BBU3900 supports the maximum cell configuration

of S24/24/24.

Ø When the BTS3900 works in GSM+UMTS dual mode, a BBU3900 supports the maximum cell

configuration of GSM S4/4/4 + UMTS S2/2/2 or GSM S5/5/5 + UMTS S1/1/1.

Ø When the BTS3900 works in UMTS mode, a BBU3900 supports 24 cells, 1,536 CEs in the

uplink, 1,536 CEs in the downlink, and the maximum configuration of 3 x 8.


Features of BTS3900u Transmission Sharing

Ø Sharing the CPRI port. The CPRI data of the GSM and UMTS networks can be multiplexed on

the same optical cable, which reduces the quantity of CPRI ports.

Ø Supports co-transmission between the GSM and the UMTS. Sharing transmission resources

between the Abis and the Iub interfaces.

u Flexible Clock Synchronization Modes

Ø Upper synchronization clock, extract clock from Abis/Iub interface.

Ø Extract clock from GPS (Global Positioning System).

Ø Synchronization with the IP clock, a highly cost-effective clock solution, which can be obtained

through software upgrade without additional hardware.

Ø Clock phase lock, tracing, and memory functions and free-run synchronization mode. When the

clock operates in free-run mode, the system can keep operational for at least 90 days at normal

temperature.


Features of BTS3900u Networking Capability

Ø The BTS3900 supports multiple network topologies, such as star, tree, chain, and ring

topologies.

Ø Supports Flex Abis networking.

Ø When working in UMTS mode, the BTS3900 supports ATM and IP dual stack to protect

operators' early investment in ATM transport.

Ø Supports optimized transmission on the Abis interface.

u Low Power Consumption


Chapter 1 BTS3900 Product Description

Chapter 2 BTS3900 System StructureChapter 2 BTS3900 System Structure


Abbreviation

DescriptionAbbreviation

WCDMA Main Processing and Transmission UnitWMPT

WCDMA Baseband Process unit Type AWBBPa

Universal Transmission Processing Unit UTRP

The Heat Exchange Unit Type AHEUA

Universal FE/GE Lighting Protection unit UFLP

Common Protocol Radio Interface CPRI

Advanced Power ModuleAPM30H

Universal E1/T1 Lighting Protection unit UELP

Universal Environment Interface unitUEIU

HPMI

UBFA

BSBC

UPEA

GTMU

The Hert Power Monitoring Interface unit

Universal BBU Fan Unit Type A (2U)

Universal BBU Subrack Backplane Type C (2U)

Universal power and Environment interface unitType A (-48v)

Transmission& Timing& Management Unit for BBU


Hardware Structure of the BTS3900

Typical configuration of the BTS3900 cabinet (-48V)

u Hardware Structure of the BTS3900 (-48V)

Ø The BTS3900 cabinet (-48V) uses the external -48V DC input. The DC power is directly led

into the DCDU-01 and the DCDU-01 distributes the DC power to each component in the

cabinet.

Ø The BTS3900 cabinet (-48V) consists of the following components: the MRFUs,

BBU,DCDU-01, and FAN unit. You can optionally install devices of 3U in height in the spare

space of the cabinet.


BBU3900 Equipmentu The BBU3900, which features a case structure, can be installed in a 19-inch-wide

and 2U-high indoor space or outdoor protective cabinet.

u BBU3900 equipment includes:

Ø GTMU

Ø WMPT

Ø WBBP

Ø UTRP

Ø UPEU

Ø UEIU

Ø UELP

Ø UFLP

Ø UBFA


Functions of the BBU3900

u As the baseband processing unit, the BBU3900 provides ports for connection

between the dual mode base station and the BSC/RNC and between the BBU3900

and the RF modules.

u The BBU3900 has the following functions:

Ø Provides ports for communication between the base station and the BSC/RNC.

Ø Provides CPRI ports for communication between the BBU and the RF modules.

Ø Provides USB ports, facilitating the automatic software upgrade of the dual-mode base

station when a USB disk is inserted during software installation and data configuration.

Ø Provides an OM channel between the base station and the LMT or the M2000 to operate

and maintain the base station.

Ø Processes uplink and downlink data.

Ø Manages the entire dual-mode system in terms of OM and signaling processing.

Ø Provides the system clock.


BBU3900 Slots

u The slots of the BBU3900 GSM, BBU3900 GU, and BBU3900 UMTS are the same.


Board configuration principles of the BBU3900 GU

Only configuredin slot 5 and slot6Slot 5 and slot 61MandatoryGTMU

Preferentially configured in slot 4Slot 0 or slot 42OptionalUFLP

-PWR11OptionalUEIU

In the case of less than or equal to four E1s, one UELP is required and

installed in slot 4. In the case of more than four but less than or equal to

eight E1s, two UELPs are required and installed in slot 0 and slot 4. In the

case of more than eight E1s, the SLPU is required and the UELPs are

installed in the SLPU.

Slot 0 or slot 42OptionalUELP

——Slot 0 － Slot 44OptionalUTRP

Preferentially configured in the PWR2 slot in the case of a single UPEUPWR1 o PWR22MandatoryUPEU

Only configured in the FAN slotFAN1MandatoryUBFA

Only configured in slot 2 and slot 3 in the case of the WBBP that transmits

CPRI SignalsSlot 0 － Slot 34MandatoryWBBP

Preferentially configured in slot 7 in the case of a single WMPTSlot 71MandatoryWMPT

Configuration LimitationsSlotMaximum

Number

Optional/

Mandatory

Board

Name

Typical configuration of the BBU3900 GU


BBU Hardware – GTMU Board

u The GSM Transmission, Timing, and Management Unit for BBU (GTMU) controls

and manages the entire BTS in GSM mode. It provides interfaces related to the

reference clock, power monitoring, OM, and external alarm collection.

u Functions:

Ø Controlling, maintaining, and operating the BTS. Providing fault management,

configuration management, performance management, and security management.

Ø Monitoring the fan module and the power supply module.

Ø Providing four routes of E1 transmission.

Ø Providing CPRI ports for the communication with the RF modules.

Ø Distributing and managing BTS clock signals.

Ø Providing the Ethernet port for local maintenance.

Ø Providing clock output for testing.


GTMU

Board

Provides the input and output of the four E1/T1 signals

between the GTMU and the UELP or between the GTMU

and the BSC.

DB26 femaleE1/T1

Provides a reference clock for the tester.USBTST

Enables the automatic software upgrade from a USB disk.USBUSB

Connects the BBU to a routing device in the equipment

room through the optical cable to transmit network

information.

DLCFE1

Connects the BBU to a routing device in the equipment

room through the Ethernet cable to transmit network

information.

RJ45FE0

Port for local maintenance and commissioningRJ45ETH

Ports for the communication between the BBU and the RF

module; support input and output of the optical and

electrical signal.

SPFCPRI0～CPRI5

DescriptionConnector TypePort


u Ports on the GTMU panel:



u DIP Switches:

The T1 impedance is set to 100 ohms.OFFON

The E1 impedance is set to 120 ohms.ONOFF

The E1 impedance is set to 75 ohms.ONON

SW1

21Description

DIP StatusDIP Switch

All the DIP bits of S2 are set to OFF (balanced

mode) by default in all modes.OFFOFFOFFOFF

When four 75- ohm E1 links are faulty, all the

DIP bits of S2 should be set to ON

(unbalanced mode) so that the Faults are rectified.

ONONONON

SW2

4321Description

DIP StatusDIP Switch


BBU Hardware – WMPT Board

u This describes the WCDMA Main Processing and Transmission unit (WMPT). It

is the BBU3900 main control and transmission board that processes the

signals and manages the resources for other boards.

u The WMPT has the following functions:

Ø Providing Operation and Maintenance (OM) functions such as configuration

management, equipment management, performance monitoring, signaling

processing, and active/standby switchover and providing OM channels connected to

the OMC (LMT or M2000).

Ø Providing the reference clock.

Ø Processing signaling and managing resources for other boards in the BBU.

Ø Providing USB ports, one of which facilitates automatic base station upgraded when a

USB disk is inserted during software installation and data configuration.

Ø Providing four E1s/T1s which support ATM and IP protocols.

Ø Providing one FE electrical port and one FE optical port which support the IP protocol.


USB testing portUSB connector

TEST

WMPT

Board

Resetting the BBU—RST

USB loading portUSB connectorUSB

Commissioning Ethernet portRJ45 connectorETH

GPS antennaSMA connectorGPS

FE optical portSFP connectorFE1

FE electrical portRJ45 connectorFE0

E1DB26 connectorE1/T1



u Ports on the WMPT:



u DIP switches on the WMPT:

SW1

DIP switch

OFF

OFF

ON

ON

T1 Mode

ONON3

ONON4

ONOFF2

ONOFF1

120-ohm E1 Mode 75-ohm E1 ModeDIP Bit

Unbalanced ModeBalanced ModeDIP BitDIP switch

SW2

OFF

OFF

OFF

OFF

ON3

ON4

ON2

ON1


BBU Hardware – WBBP Board

u This describes the WCDMA Baseband Process Unit (WBBP) board. It is a

mandatory board of the BBU3900 that processes baseband signals.

u The WBBP has the following functions:

Ø Provides the CPRI ports for communication between the BBU and the RFU, and supporting

CPRI ports in 1+1 backup mode.

Ø Processes uplink and downlink baseband signals.

u There’re two types of WBBP board: WBBPa and WBBPb.


BBU Hardware – WBBP Board

u Specifications of the WBBPs:

Number of DL CEsNumber of UL CEsNumber of CellsBoard

2561283WBBPa

64643WBBPb1

1281283WBBPb2

2562566WBBPb3

3843846WBBPb4


BBU Hardware – UPEU Board

u This describes the Universal Power and Environment Interface Unit

(UPEU) board. It is a mandatory board of the BBU3900 that converts -48 V

or +24 V DC to +12 V DC.

u The UPEU has the following functions:

Ø Converting -48 V or +24 V DC to +12 V DC that is applicable to the boards.

Ø Providing two ports with each transmitting one RS485 signal and another two

ports with each transmitting four dry contact signals.

Ø Providing reverse connection protection for power cable connectors.

u The UPEU is classified into the Universal Power and Environment

Interface Unit Type A (UPEA) and the Universal Power and Environment

Interface Unit Type B (UPEB). The UPEA converts -48 V DC to +12 V DC

and the UPEB converts 24 V DC to 12 V DC.


BBU Hardware – UELP Board

u The Universal E1/T1 Lightning Protection (UELP) is a universal E1/T1 surge

protection unit. The UELP is optionally installed in the SLPU or BBU. Each

UELP provides surge protection for four E1s/T1s.

E1 transmission portDB26OUTSIDE

E1 transfer transmission portDB25INSIDE


120-ohm E1 cable or 100-ohm T1 cableOFFOFFOFFOFF

75-ohm E1 cableONONONONS1

4321

DescriptionDIP StatusDIP Switch

u The UELP has one DIP switch, which is used to select whether the receive terminal is grounded.


BBU Hardware – UFLP Board

u The universal FE lightning protection (UFLP) board is optionally installed in

the SLPU or BBU3900. Each UFLP supports 2-way FE surge protection.

RJ452FE0、FE1OUTSIDE

RJ45 2FE0、FE1INSIDE

Connector TypeQuantityPortPort Location


BBU Hardware – UTRP Board

u This describes the Universal Transmission Processing unit (UTRP) board. It is

a transmission extension board of the BBU3900 and provides eight E1s/T1s

and one unchannelized STM-1/OC-3.

u The UTRP has the following functions:

Ø Providing extension Iub transmission ports which support eight E1s/T1s and one

unchannelized STM-1/OC-3.

Ø Supporting ATM and IP transport.

Ø Supporting cold backup.


BBU Hardware – UTRP Board

u The panel of the UTRP configured with the UAEU or UIEU is different from

that of the UTRP configured with the UUAS.

u The UTRP can be configured with different sub-boards to support different ports.

Panel of the UTRP (with 2 FE/GEs)


BBU Hardware – UBFA Module

u This describes the Universal BBU Fan Unit Type A (UBFA) module of the

BBU3900. The UBFA controls the fan speed and detects the temperature of

the fan board.

The module is not

registered, and no

alarm is reported.

0.125s ON, 0.125s OFF

The module is

reporting alarms.1s ON, 1s OFF

No alarm is reported.OFFRed

The module is

running properly.1s ON, 1s OFF

Green

STATE

DescriptionStatusColorLED


BBU3900 Cable

u BBU3900 Cable List:

Power Cable E1 Surge Protection Transfer Cable

FE Cable CPRI Optical Cable


BBU Cable

u BBU3900 Cable List:

(2) cold-pressed terminal

(1) RJ45

connector

Monitoring Signal Cable Between the OFB and the BBU

Monitoring Signal Cable Between the APMI and the BBU

(4) 3PIN connector(3) ring terminal

(2) cold-pressed terminal

(1) RJ45 connector


MRFU Module

u The MRFU is a multi-carrier RF filtering unit. One MRFU supports a maximum of

6 carriers in GSM mode, 4 carriers in UMTS mode, 6 carriers in GSM+UMTS

mode.

u Functions:

Ø Implements the direct frequency conversion technique in the transmit channel,

modulates the baseband signals to GSM RF signals; then, sends the signals to the

antenna for transmission through the duplex filter after filtering, amplifying, and

combining the RF signals. The combining can be performed as required.

Ø Receives RF signals from the antenna and performs down-conversion, amplification,

analog-to-digital conversion, digital down-conversion, matched filtering.

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

power consumption and save the device cost.

Ø Provides power control, reverse power detection.

Ø Provides frequency synthesis and loopback test.

Ø Generates the CPRI clock, recovers the CPRI clock of lost synchronization, and detects

alarms.

Ø Provides the function of DPD/BPD.


Logical structure of the MRFU

u The MRFU consists of the high-speed interface unit, signal processing unit,

power amplifier, and duplexer.


MRFU Board

u Size：397.25mm（h）×70.62mm（w）×305mm（d）

Weight：10Kg

u Ports on the panel:

RJ45 connectorMON

3V3 power connectorPWR

RX_OUTA

CPRI1

Connecting to the antenna subsystem.DIN connectorANT_RXBPort for

transceiving

RF signals

RX_INB

CPRI0

ANT_TX/RXA

Label

Monitoring port

Power supply port

RS485 Monitoring、debugging port.

Feeding power.

Output port of diversity signals in theantenna channel.

Input port of diversity signals in theantenna channel.

QMA female

connector

Interconnection port

for RF

Receive signals

Connecting to the lower-level RFU during the cascading.

Connecting to the BBU, or the upper-levelRFU during the cascading.

SFP female connectorCPRI

DescriptionConnector TypePort Type


The main limitation of MRFU

u MRFU supports whole frequency band of PGSM 900MHz, high 45MHz frequency

band and low 45MHz frequency band of DCS1800MHz. High 40MHz frequency

band and low 40MHz frequency band of 1900MHz.

1740-1785MHz1835-1880MHzHigh 45MHz of 1800MHz

1870-1910MHz1950-1990MHzHigh 40MHz of 1900MHz

1850-1890MHz1930-1970MHzLow 40MHz of 1900MHz

1710-1755MHz1805-1850MHzLow 45MHz of 1800MHz

890-915MHz935-960MHzWhole 25MHz frequency band of 900MHz

ULDLMRFU


The main limitation of MRFU

u The instantaneous frequency bands supported by MRFU.

u Power sharing doesn’t support Concentric cell, Co-BCCH, IBCA, RAN sharing while

static power can support these functions.

u MRFU supports 2-way RX diversity. 4-way RX diversity and TX diversity are not

supported.

2

2

2

Number of RX

15MHz

20MHz

15MHz

frequency band of TX

25MHz1GU dual mode

25MHz1UMTS mode

25MHz1GSM mode

frequency band of RX

Number of TXMRFU Type


Configuration principle of MRFU

u Basic configuration principle:

Ø One MRFU supports a maximum cell configuration of S6.

Ø 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 cell configuration of S24/24/24.

Ø One MRFU does not serve two cells. Each cell with a single antenna can be configured with

a maximum of two MRFUs.

Ø MRFU supports 1-way TX and 2-way RX.

Ø Star, chain, and ring, are supported between the BBU and the MRFUs.

Ø When star and chain topology is adopted between the BBU and MRFUs, the MRFU supports

3 levels of cascading in a chain and thus the BBU supports a maximum of 18 (6 x 3) MRFUs.


Configuration principle Base on Limitation of MRFUu Assign frequency:

Ø If the frequency interval of a cell is outside the range of 15MHz, 2 MRFUs can be considered

to be used and the range of frequency for each MRFU also should be within15MHz.

Ø Generally, it is suggested that the number of carriers should be set to 2 MRFUs averagely if

2 MRFUs are used in a cell. For example: S8 should be configured as 4+4 when 2 MRFUs

are used. S7 should be configured as 3+4 when 2 MRFUs are used. If there’s limitation of

frequency band, S8 also can be configured as 3+5 or 2+6.

u Frequency hopping:

Ø Cell without frequency hopping. The cell can work normally when the range of frequency is

within 15MHz for each MRFU.

Ø Cell with Baseband frequency hopping. The frequency range of 2 MRFUs must within

25MHz when 2 MRFUs are used. And the range of frequency also must be within 15MHz

for each MRFU.

Ø Cell with RF frequency hopping. The cell cannot adopt RF frequency hopping if the range of

frequency is out of 15MHz. Because the frequency range of 2 MRFUs must be within 15MHz

when 2 MRFUs are used.


Configuration principle Base on Limitation of MRFUu Output power:

Ø The maximum output power of MRFU is 80W.

Ø The output power for each cell must fulfil the requirement of network plan. When

the specification doesn’t fulfil the requirement, it can be improved by adding

MRFUs.

Ø The output power of all the cell must be the same because power sharing is

mutually exclusive with concentric cell. For example, S7 configured as 3+4 when 2

MRFUs are used. The output power of MRFU configured as 3 carriers must be the

same as that of MRFU configured as 4 carriers.

Ø Specifications of output power is Class 2, please refer to the next page.


27030

20040

01805

01606

404011

GSM+UMTS mode

204021

402012

202022

102413

202013

102014

201714

102023

201223

101324

101515

60010

UMTS mode40020

02704

03103

04002

08001

GSM mode

Output power of each UMTS TRX(W)Output power of each GSM TRX(W）UMTS TRXGSM TRXWorking mode

u Specifications of output power is Class 2:


Antenna Configuration of MRFU

u Single Feeder.

Ø Two module interconnection. 1TX and 2RX.

u Double Feeder.

Ø Single module. 1TX and 2RX.


Transmit Mode and Receive Mode of MRFU

u Transmit Mode of MRFU.

Ø Non-combination.

u Receive Mode of MRFU.

Ø 2-way RX diversity.


Typical configuration of MRFU

u Single MRFU.

u Double feeder, 1TX + 2RX.

Ø When a dual-polarized antenna is configured, one

TX channel and two RX channels are supported.

The ANT_RXB and ANT_TX/RXA ports receive

the signals from the antenna to achieve RX

diversity.


Typical configuration of MRFU

u Two module interconnection.

u Single feeder, 1TX + 2RX.

Ø When the cell configuration is from S7 to S12, two

MRFUs need to be configured.

Ø The ANT_TX/RXA port on each MRFU supports

the receiving and transmitting of signals. Two

MRFUs provide RX signals for each other through

the RF interconnection ports. Thus, the RX

diversity is implemented.


Typical configuration S8/8/8


Scenario 1


Scenario 2

BBU

EMUA

APM30

GSMS4/4/4

DCS S888

Base Frame

WRRU

WRRU

WRRU

W W W

WCDMAS222

MRRUD

MRRUD

MRRUD

MRRUD

MRRUD

MRRUD

MRRUG

MRRUG

MRRUG


Summary

u Functions of BTS3900

u Hardware structure of BTS3900

u New hardware of BTS3900

u Features and working mode of MRFU


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240243228 huawei-bts-3900-training