HUAWEI GSM DBS3900 Hardware Structure pot

RRU Remote Radio unit BBU Base Band unit GTMU Transmission& Timing& Management Unit for BBU UPEA Universal power and Environment interface unitType A -48vBSBC Universal BBU Subrack Backp

DBS3900 is a distributed BTS solution developed by Huawei Technologies Co.,Ltd Its baseband part and radio part can be installed independently so that it can be used to various

environments with wide coverage and low cost

 Know the functions and features of DBS3900

 Master the Hardware structure and function of DBS3900

 Familiar with the Typical configuration and cable

connection of DBS3900

 Master the Network topologies of DBS3900

 DBS3900 Electronic Documentation

 BBU3900 Quick Installation Guide

 RRU3004 Quick Installation Guide

 DBS3900 Deployment Guide

Chapter 1 DBS3900 System Description

Chapter 2 DBS3900 Hardware Structure Chapter 3 DBS3900 Typical Configuration Chapter 4 DBS3900 Network Topologies

PSTN ISDN PSPDN

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

Functions and Features

 Wide coverage, low cost

 Suitable for various environments, flexible installation

 Support PGSM900M 、 EGSM900 、 DCS1800M

 One RRU module can support 2 TRXs

 Support transmit diversity

 Support PBT

 Support four-way receive diversity over different RRU

 BBU support star, tree, chain and ring topology

 Calculate TA exactly

 Support GPRS and EGPRS

Functions and Features

 Support Omni-directional coverage and directional coverage

 One BBU can support 36TRX at most and 12 cells at most

 Support A5/3, A5/2, A5/1 encryption and decryption

 Support dynamic radio frequency management

 Cell broadcasting service and point-to-point short message

 Support mixed combining with BTS3012

 Support -48VDC power input

Chapter 1 DBS3900 System Description

Chapter 2 DBS3900 Hardware Structure

Chapter 3 DBS3900 Typical Configuration Chapter 4 DBS3900 Network Topologies

RRU Remote Radio unit

BBU Base Band unit

GTMU Transmission& Timing& Management Unit for BBU UPEA Universal power and Environment interface unitType A (-48v)BSBC Universal BBU Subrack Backplane Type C (2U) UBFA Universal BBU Fan Unit Type A (2U)

UEIU Universal Environment Interface unit

UELP Universal E1/T1 Lighting Protection unit

UFLP Universal FE/GE Lighting Protection unit

CPRI Common Protocol Radio Interface

APM Advanced Power Module

IBBS Integrated Backup Battery System

OFB Outdoor Facility Box

Sector 1 DBS3900 Hardware Components

Sector 2 BBU3900 System Structure Sector 3 RRU3004 System Structure Sector 4 DBS3900 Typical Scenario

 The DBS3900 consists of the BBU3900 and the RRU3004

 The BBU3900 is an indoor baseband unit It provides physical interfaces for connection with the BSC and RRU It performs centralized management (OM and signaling processing) of the entire base station system and provides

reference clock for the system

 The RRU3004 is an outdoor remote RF unit It processes baseband signals and RF signals

 The Local Maintenance Terminal (LMT) and Man-Machine Interactive (MMI) can implement the maintenance of the DBS3900 through the BBU3900

BBU3900

APM30 Overview

 The APM30 provides –48 V 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 lightning protection

1 Filler panel(1U)

2 Power sub-rack (3 U)

3 DC PDU(2U) 4~8 Filler Panel(1U)

9 Space for batteries (3U)

OFB Overview

supports DC power input

and DC power distribution

and can serve as a cabinet

for the transmission

equipment, provides 11U

installation space

system, the OFB is unable

to adapt to low-temperature

environment The OFB is

applicable to category C

environment

Sector 1 DBS3900 Hardware Components

Sector 2 BBU3900 System Structure

Sector 3 RRU3004 System Structure Sector 4 DBS3900 Typical Scenario

between the BTS and the BSC

 Provides physical interfaces between the BTS and the BSC for

interaction.

 Provides CPRI ports for communication with the RRU3004

 Provides the USB port for downloading the BTS software.

 Provides OM channels for connection to the LMT (or M2000)

 Processes UL and DL data

 Provides centralized management on the entire DBS system, such as

OM and signaling processing

 Provides the reference clock for the entire system.

Logical Structure of the BBU3900

Hardware Components of BBU3900

 The typical power consumption of the BBU is 35 W

 The weight of the BBU isn’t more than 12KG

 Each BBU3900 supports a maximum of 36 TRXs, and 12 cells

 The BBU is a small box with all the external ports on the front panel

 The BBU3900 boards consist of the BSBC, UEIU, GTMU, and UELP; the BBU3900 modules consist of the UBFA and the UPEU

BSBC Board

 The BSBC is the backplane of the BBU The BSBC provides eight

board slots, two power slots, and one fan slot

 The universal BBU sub-rack backplane type C (2U) (BSBC) provides backplane interfaces for communication between boards and supplies power for boards

 The GTMU is located in slots 5 and 6, slot 7 for a main control board that supports 3G, and other ports as common slots

GTMU Board

 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 supply, OM, and external alarm collection

 The GTMU performs the following functions:

 Controls, maintains, and operates the BTS

 Supports 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

 Supports four E1 inputs

 Provides the CPRI ports for communication with the RRU

GTMU Board

 Ports on the GTMU Panel

CPRI0–

CPRI5 DLC connector CPRI optical cable between the BBU

and the RRU

Provides the input and output of the optical signals

ETH RJ45

connector

Crossover cable (delivered with the equipment)

Performs local maintenance and commissioning

FE0 RJ45

connector - 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

connector

- 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

connector

- A reserved port that performs the following function:

Automatically upgrades the software through the USB disk

GTMU Board

 LEDs on the GTMU Panel

RUN Green On The board is faulty.

Off There is no power supply or the board is faulty.

Blinking once/2s The board is operational.

Blinking once/4s The OML link is abnormal.

Blinking four times/s

The board is loading software.

ALM Red On A fault occurs in the running board.

Off An alarm is not generated.

ACT Green On The board is operational.

Off The board is faulty.

LIU0–LIU3 Green On A local E1/T1 alarm is generated.

Blinking four times/s

A remote E1/T1 alarm is generated.

Off This link is not used or the alarm is cleared.

CPRI0-CPRI5 Green On The CPRI link is functional.

Red On The reception of the optical module is abnormal and an alarm

is triggered.

ON OFF ON OFF The E1 link of the Level

2 cascaded BTS can be bypassed.

OFF OFF ON OFF The E1 link of the Level

3 cascaded BTS can be bypassed.

ON ON OFF OFF The E1 link of the Level

4 cascaded BTS can be bypassed.

OFF ON OFF OFF The E1 link of the Level

5 cascaded BTS can be

UBFA Module

 The universal BBU fan unit type A (2U) (UBFA) communicates with the GTMU to regulate the temperature, adjust the fan speed, and report alarms The UBFA module is hot swappable

STATE Green Blinking twice per

second The board is not securely connected An alarm is not

generated.

Red On An alarm is generated.

Green Blinking once

every two seconds

The board operates normally.

UPEU Module

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

supports 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

MON0 RJ45

Connector

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

MON1 RJ45

Connector

Reserved

ALM0 RJ45Connector Transmits the externally collected environment monitoring signals to the

EXT-GTMU through communications protocol related to the dry contact

ALM1 RJ45Connector ReservedPWR 3V3Power

EXT-Connector

–48V power input

UEIU Board

 The universal environment interface unit (UEIU) supports multiple

environment monitoring signals The UEIU supports eight Boolean

alarm signals and two RS485 environment monitoring signals

 The UEIU is optional It is configured when the environment interfaces

communications protocol MON1 RJ45

Connector

Reserved

ALM0 RJ45Connector Transmits the externally collected environment monitoring signals to the

EXT-GTMU through communications protocol related to the dry contact EXT-

ALM1

RJ45 Connector

Reserved

UELP Board

 The universal E1/T1 lightning protection unit (UELP) provides lightning protection for four E1/T1 signals

INSIDE DB25 male connector E1 transfer cable

of the BBU

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

OUTSIDE DB26male connector E1/T1 cables of

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

SW1 OFF OFF OFF OFF Twisted-pair cable（ 100Ω T1 or 120Ω E1 ）

ON OFF ON OFF Coaxial cable（ 75Ω E1 ）

 UELP Board provides a DIP switch to set impedance of E1/T1

BBU Cables

power cable, E1/T1 cable, E1 transfer cable, RS485 environment monitoring signal cable, CPRI signal cable between the BBU and the RRU, and BBU monitoring signal cable

BBU Cables

 The cables figure of the BBU

-48VDC power cables E1 transfer cable

BBU Cables

 The cables figure of the BBU

(1)RJ45 Connector (2) Cord end terminal

Monitoring signal cable between the OFB and the BBU

Monitoring signal cable between the APM and the BBU

(1)RJ45 Connector (2) Cord end terminal (3)OT

Connector (4)Common 3PIN

Connector

Sector 1 DBS3900 Hardware Components Sector 2 BBU3900 System Structure

Sector 3 RRU3004 System Structure

Sector 4 DBS3900 Typical Scenario

 The direct IQ modulation technique, which is directly implemented in the transmit

channel, modulates the baseband signals into GSM RF signals After being filtered and amplified, the RF signals are transmitted to the antenna for transmission,

through the duplexer in the RF front-end unit.

 The uplink RF signals received from the antenna go through down-conversion,

amplification, analog-to-digital conversion, matched filtering, Automatic Gain Control (AGC), and then are sent to ASIC and DSP for demodulation and decoding.

 Power regulation and Voltage Standing Wave Ration (VSWR) detection.

 Frequency synthesization and loopback test.

 Generation and recovery of the clock circuitry at the CPRI interface, and the alarm

detection

Logical Structure of the RRU

RXM_OUT:RRU RX main output for RRU

cascading RXD_IN:RRU RX diversity input for RRU cascading

Components of the RRU3004

 An RRU3004 consists of two RRU modules

 The RRU module has a modular structure The external interfaces of the RRU module are located at the bottom of the module and in the cabling cavity

 The weight of RRU3004 is 38Kg The RRU3004 can be installed on a wall, stand, metal pole, or tower

RRU Module

 Ports of the RRU Module

Bottom panel RX_IN/OUT Interconnection ports for RF signals

RET RET antenna port ANT_TX/RXA RF TX/RX port A ANT_TX/RXB RF TX/RX port B Cabling cavity

panel RTN+ Power wire post

NEG-TX RX CPRI_E Eastern optical port

TX RX CPRI_W Western optical port EXT_ALM Alarm Port

RST Hardware reset button TST VSWR Test button for VSWR alarms TST CPRI Test button for the CPRI port

RRU Module

 LEDs on the RRU Module

RUN On The board is faulty.

Off No power input is available.

Blinking once every two seconds The board is operational.

ALM On (blinking at high frequency) There is a fault related to the running board.

Off No alarm is detected.

ACT On Normal operation

Off The connection with the BBU is not established.

Blinking once every two seconds Only one logical transceiver is functional (including TRX mutual aid is

implemented).

Blinking twice per second Local test status VSWR TX_ACT On (green) No VSWR alarm is detected.

Blinking once every two seconds (green) The board is operational.

Blinking once every two seconds (red) A VSWR alarm is detected at the ANT_TX/RXA port.

Blinking once per second (red) A VSWR alarm is detected at the ANT_TX/RXB port.

On (red) A VSWR alarm is detected at the ANT_TX/RXA and ANT_TX/RXB ports OPTW/E(westwar

d/eastward CPRI

LED )

On (green) The CPRI link is functional.

On (red) The reception of the optical module is abnormal and an alarm is

triggered.

Blinking once every two seconds (red) The CPRI link is out of lock.

Connections of RRU Cables

 The RRU3004 has the following cables: PGND cable, power cable, AISG multi-wire cable, AISG extension cable, CPRI optical cable, RF jumpers, Boolean input cable, and cables for cascaded RRUs

Connections of RRU Cables

 The related cable’s figure of the RRU

RRU –48 V DC power cable RRU Power cable for cascaded RRU modules

Signal cable between the electrical

ports on cascaded RRU modules CPRI optical cable

Connections of RRU Cables

 The related cable’s figure of the RRU

Cascaded RF jumper Boolean input cable

AISG multi-wire cable AISG extension cable

Sector 1 DBS3900 Hardware Components Sector 2 BBU3900 System Structure

Sector 3 RRU3004 System Structure

Sector 4 DBS3900 Typical Scenario

Typical Scenarios of the DBS3900

Typical Scenarios of the DBS3900

 Scenario 2: BBU+RRU+APM+OFB

 When the site provides the AC power supply and the space in the APM is

insufficient, the installation scenario can be used

 The OFB provides 5 U to 11 U transmission space in which transmission equipment or batteries can be installed

 The BBU can be configured in the APM The APM supplies –48 V DC power to the BBU and RRU and also provides backup DC power

Typical Scenarios of the DBS3900

Chapter 1 DBS3900 System Description Chapter 2 DBS3900 Hardware Structure

Chapter 3 DBS3900 Typical Configuration

Chapter 4 DBS3900 Network Topologies

Sector 1 RRU Work Mode Introduction

Sector 2 RRU Typical Configuration

Internal Principle of the RRU

 RRU consists of two TRXs and two duplexers, and the RRU can be

connected to the antenna directly

 The RF jumper between cascaded RRU modules is used to connect the RX_IN/OUT ports of two RRU modules so that receiving diversity signals can be transmitted between the two RRU modules

The Antenna Configuration of the RRU

 Single antenna

 There is no receiving diversity or transmitting diversity.

 Single antenna and double receivers

 The RRU module has one TX/RX feeder and two way receiving diversities, one of the receiver is from the another RRU module of the RRU3004.

 Double antennas

 The RRU module has two TX/RX feeders and two way receiving diversities.

 Double antennas and four receivers

 Each RRU can have two TX/RX feeders, and two RRUs are combined to support four way receive diversity.