RRU

Security Level: Internal Use

2008-03

HUAWEI GSM DBS3900 Hardware Structure

www.hua wei.com

HUAWEI Confidential

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.

HUAWEI TECHNOLOGIES Co., Ltd.

HUAWEI Confidential

Page 2

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


HUAWEI Confidential

Page 3

DBS3900 Electronic Documentation

BBU3900 Quick Installation Guide

RRU3004 Quick Installation Guide

DBS3900 Deployment Guide


HUAWEI Confidential

Page 4

Chapter 1 DBS3900 System Description Chapter 2 DBS3900 Hardware Structure Chapter 3 DBS3900 Typical Configuration Chapter 4 DBS3900 Network Topologies


HUAWEI Confidential

Page 5

Location Um Interface

MS

TUP,ISUP

DBS3900 BSC

PSTN ISDN PSPDN

A Interface MS

MSC/VLR MAP

M AP

DBS3900

HLR/AUC/EIR

BTS MS

SMC/VM OMC

DBS3900

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

DBS：Distributed Base Station


HUAWEI Confidential

Page 6

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


HUAWEI Confidential

Page 7

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


HUAWEI Confidential

Page 8



HUAWEI Confidential

Page 9

Abbreviation RRU

Remote Radio unit

BBU

Base Band unit

GTMU

Transmission& Timing& Management Unit for BBU

UPEA

Universal power and Environment interface unit Type 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


HUAWEI Confidential

Page 10

Sector 1 DBS3900 Hardware Components Sector 2 BBU3900 System Structure Sector 3 RRU3004 System Structure Sector 4 DBS3900 Typical Scenario


HUAWEI Confidential

Page 11

DBS3900

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. RRU3004

RRU3004

RRU3004

BBU3900


HUAWEI Confidential

Page 12

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)


HUAWEI Confidential

Page 13

OFB Overview

OFB (Outdoor Facility Box) supports DC power input and DC power distribution and can serve as a cabinet for the transmission equipment, provides 11U installation space.

Since it has no heating system, the OFB is unable to adapt to low-temperature environment. The OFB is applicable to category C environment.


HUAWEI Confidential

Page 14

IBBS Overview

As an auxiliary product for Huawei outdoor BTSs, the Integrated Backup Battery System (IBBS) provides backup power to meet the requirements for fast network deployment. Output: -48V DC. Backup power mode: serial or parallel connection between batteries. Operating temperature: The IBBS cabinet is functioning normally when the temperature is +55°C. Alarm system: It provide door control, smog and temperature sensors. A maximum of 16 batteries of 12 V 100 Ah or 2 V 150 Ah, four batteries in one group and four groups in the IBBS cabinet.


HUAWEI Confidential

Page 15



HUAWEI Confidential

Page 16

BBU3900 The BBU3900 is an indoor BTS control unit that enables interaction

between the BTS and the BSC. The BBU3900 performs the following functions:

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.


HUAWEI Confidential

Page 17

Logical Structure of the BBU3900


HUAWEI Confidential

Page 18

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.


HUAWEI Confidential

Page 19

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.


HUAWEI Confidential

Page 20

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


HUAWEI Confidential

Page 21

GTMU Board

Ports on the GTMU Panel Port

Type

Cable

Description

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

TST

USB connector

-

Tests the output clock signals with a tester

E1/T1

DB26 male connector

E1/T1 cable of the BBU

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


HUAWEI Confidential

Page 22

GTMU Board

LEDs on the GTMU Panel LED

RUN

ALM

ACT

LIU0–LIU3

CPRI0-CPRI5

Color Green

Status

Description

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.

On

A fault occurs in the running board.

Off

An alarm is not generated.

On


Off


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.

Green

On

The CPRI link is functional.

Red

On

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

Red

Green

Green


HUAWEI Confidential

Page 23

GTMU Board

DIP switch SW1

DIP status 1

Description

SW4

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.

DIP switch

SW2

DIP switch

DIP Switch of GTMU

DIP status

SW5

DIP status

Description

1

2

3

4

ON

ON

ON

ON

The E1 link can be bypassed.

OFF

OFF

OFF

OFF

The E1 link cannot be bypassed.

ON

ON

ON

ON

The E1 link cannot be bypassed.

OFF

ON

ON

OFF

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

ON

OFF

ON

OFF


OFF

OFF

ON

OFF


ON

ON

OFF

OFF


OFF

ON

OFF

OFF


Description

1

2

3

4

ON

ON

ON

ON

The E1 cable is grounded.

OFF

OFF

OFF

OFF

The E1 cable is not grounded.


HUAWEI Confidential

Page 24

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.

LED

Color

Status

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.


HUAWEI Confidential

Description

Page 25

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.


Port

Type

Description

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

EXTALM0

RJ45 Connector

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

EXTALM1

RJ45 Connector

Reserved

PWR

3V3Power Connector

–48V power input

HUAWEI Confidential

Page 26

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 are insufficient.


Port

Type

Description

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

EXTALM0

RJ45 Connector

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

EXTALM1

RJ45 Connector

Reserved

HUAWEI Confidential

Page 27

UELP Board

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

Port

Type

Cable

Description

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

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

DIP Status 1

SW1

2

3

Description 4

OFF

OFF

OFF

OFF

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

ON

OFF

ON

OFF

Coaxial cable（75Ω E1）


HUAWEI Confidential

Page 28

BBU Cables

The BBU3900 cables are classified into the PGND cable, –48 V DC 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.

The cable connection relations of the BBU as following:


HUAWEI Confidential

Page 29

BBU Cables

The cables figure of the BBU

E1 transfer cable

-48VDC power cables

CPRI optical cable

FE cable


HUAWEI Confidential

Page 30

BBU Cables

The cables figure of the BBU

(1)RJ45 Connector

(2) Cord end terminal

(3)OT Connector

(4)Common 3PIN Connector

Monitoring signal cable between the OFB and the BBU

(1)RJ45 Connector Monitoring signal cable between the APM and the BBU


HUAWEI Confidential

Page 31

(2) Cord end terminal



HUAWEI Confidential

Page 32

RRU3004 The RRU3004 is an outdoor remote RF unit. The functions of the RRU3004 are as follows:

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.


HUAWEI Confidential

Page 33

Logical Structure of the RRU

RXM_OUT:RRU RX main output for RRU cascading HUAWEI TECHNOLOGIES Co., Ltd.

RXD_IN:RRU RX diversity input for RRU cascading

HUAWEI Confidential

Page 34

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.


HUAWEI Confidential

Page 35

RRU Module

The RRU module has a bottom panel, a cabling cavity panel, and an area attached with LEDs.

Provides - 48VDC power supply.

1

Bottom panel

2

Cabling cavity panel

3

LEDs


HUAWEI Confidential

Page 36

RRU Module

Ports of the RRU Module Item

Bottom panel

Cabling cavity panel

Label

Description

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

RTN+

Power wire post

NEGTX 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


HUAWEI Confidential

Page 37

RRU Module

LEDs on the RRU Module LED

RUN

ALM

ACT

VSWR TX_ACT

OPTW/E(westwar d/eastward CPRI LED )

Status

Meaning

On


Off

No power input is available.



On (blinking at high frequency)

There is a fault related to the running board.

Off

No alarm is detected.

On

Normal operation

Off

The connection with the BBU is not established.


Only one logical transceiver is functional (including TRX mutual aid is implemented).

Blinking twice per second

Local test status

On (green)

No VSWR alarm is detected.

Blinking once every two seconds (green)


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.

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.

Off

The SFP module is out-of-position or the optical module is powered off.


HUAWEI Confidential

Page 38

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.


HUAWEI Confidential

Page 39


The related cable’s figure of the RRU

RRU Power cable for cascaded RRU modules

RRU –48 V DC power cable

Signal cable between the electrical ports on cascaded RRU modules


CPRI optical cable

HUAWEI Confidential

Page 40


The related cable’s figure of the RRU

Boolean input cable

Cascaded RF jumper

AISG extension cable

AISG multi-wire cable


HUAWEI Confidential

Page 41



HUAWEI Confidential

Page 42

Typical Scenarios of the DBS3900

Scenario 1: BBU+RRU+APM+IBBS

When the site provides only the AC power supply and a long-time backup power supply is required, the installation scenario can be used.

The BBU can be installed in the APM. The APM supplies -48 V DC power to the BBU and RRU.

The IBBS can supply backup power to the BTS for a long time to ensure that the BTS still operates normally in the case of an AC power supply failure.

The RRU can be installed on a stand, pole, wall, or tower.


HUAWEI Confidential

Page 43


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.


HUAWEI Confidential

Page 44


Scenario 3: BBU+RRU+OFB

When there is no equipment room on site, the DC power supply is available, and the backup power supply is not required, the installation scenario can be used.

The BBU is installed in the OFB. The OFB supplies –48 V DC power to the BBU and RRU.


HUAWEI Confidential

Page 45



HUAWEI Confidential

Page 46

Sector 1 RRU Work Mode Introduction Sector 2 RRU Typical Configuration


HUAWEI Confidential

Page 47

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.


HUAWEI Confidential

Page 48

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.


HUAWEI Confidential

Page 49

RRU Power Mode

M900 RRU

Optional value: “30W”,“25W”,“15W”,“12W”.

Default value: “15W”, RRU supports transmit combining or independency here, otherwise RRU supports transmit independency only.

M1800 RRU

Optional value :”20W”, “10W”.

Default value: “10W”, RRU supports transmit combining or independency here, otherwise RRU supports transmit independency only.


HUAWEI Confidential

Page 50

RRU Transmit Mode and Receive Mode

RRU transmit mode

Transmit combining or independency

PBT

Transmit diversity

RRU receive mode

Receive diversity

Four way receive diversity


HUAWEI Confidential

Page 51

Cell Configuration of Single RRU

S1

Configure only one TRX in one RRU.

Optional TRX work mode: “Transmit combining or independency”, “PBT”, “Transmit diversity”, ”Receive diversity“, ”Four way receive diversity”.

S2

Two TRXs of RRU are configured in a S2 cell.

Optional TRX work mode: ” Transmit combining or independency “, ”Receive diversity”.

S1/1

Two TRXs of RRU are configured in two S1 cells.

Optional TRX work mode: ” Transmit combining or independency “, ” Receive diversity“.

Actually, the TRX only have single receiving channel.


HUAWEI Confidential

Page 52

Combination Solution of Two RRUs

Two RRUs are combined to share receive and transmit channels so that the configuration is more flexible. In the following figure, the cable between CPRI_W and CPRI_E are used for the TRX baseband signal interconnection, while RX_IN/OUT is only used for two way receiving diversity between two RRUs.

CPRI-W

Interface Processing Unit

CPRI-E

ANTA DUP ANTB DUP

CPRI-W


CPRI-E

RX-IN RX_OUT ANTA

DUP ANTB DUP

RX-IN RX_OUT


HUAWEI Confidential

Page 53

RRU Transmit Mode-Transmit Combining or Independency

In this mode, two TRXs of RRU are both work.

In this mode, the system will work on the transmit independency or transmit combining mode automatically, according to the power mode and antenna mode.

In transmit dependency mode, TRX0 occupies channel A while TRX1 occupies channel B.

In transmit combining mode, the combining signal are transmitted through channel A.


HUAWEI Confidential

Page 54

RRU Transmit Mode-Transmit Combining or Independency

Transmit independency

CPRI-W


CPRI-E

ANTA DUP ANTB DUP

Transmit combining

CPRI-W


CPRI-E


ANTA DUP

ANTB DUP

HUAWEI Confidential

Page 55

RRU Transmit Mode-PBT

In PBT mode, only the first TRX can work.

PBT mode can improve the transmitting power to 40W.

In PBT mode, downlink signal are transmitted through channel A.

CPRI-W


CPRI-E


ANTA DUP

ANTB DUP

HUAWEI Confidential

Page 56

RRU Transmit Mode-Transmit Diversity

In this mode, only the first TRX can work.

Transmit diversity mode can improve signal the quality of downlink signal.

In this mode, the signal from the first TRX will be divided to two channels and be transmitted through channel A and channel B.

CPRI-W


CPRI-E


ANTA DUP

ANTB DUP

HUAWEI Confidential

Page 57

RRU Receive Mode-Main and Diversity

Receive diversity, RRU can work as double TRX mode.

Each TRX can receive the signal from two feeders.

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

It is also possible for TRX to use the channel A receiver of the other RRU in two RRUs combining solution.

CPRI-W


CPRI-E

ANTA DUP

ANTB DUP

RX-IN RX_OUT


HUAWEI Confidential

Page 58

The second receiving diversity signal may come from second RRU

RRU Receive Mode-Four Way Receive Diversity

In this mode, only the first TRX can work.

The working TRX gets the uplink signal from four feeders of two RRUs.

Only the antenna mode “Double Antennas, Four Receivers” can support “Four way receive diversity”. CPRI-E

Interface Processing

The other two receiving diversity signal come from second RRU

ANTA

ANTB

CPRI-W

DUP

RX-IN RX_OUT

Interface Processing

CPRI-E

ANTA

ANTB

CPRI-W

DUP

RX-IN RX_OUT


HUAWEI Confidential

Page 59

Sector 1 RRU Work Mode Introduction Sector 2 RRU Typical Configuration


HUAWEI Confidential

Page 60

Typical Configuration 1

S1(Transmit Diversity or Transmit

ANT

Independency + Receive Mode Main and Diversity )

Transmit mode should be set to “Transmit Independency or combining”

RX-in/out

Receive mode should be set to “Receive diversity”.

ANTTX/RXB

ANTTX/RXA

CPRI_E

Antenna mode should be set to” Double Antenna”.

CPRI_W

It also can be configured as non-ring.

RRU

The maximum transmit power of RF port: M900: 30W/TRX CPRI0 CPRI1

M1800:20W/TRX.

CPRI5

BBU HUAWEI TECHNOLOGIES Co., Ltd.

HUAWEI Confidential

Page 61


S1(Transmit Diversity + Receive Mode

ANT

Main and Diversity )

Transmit mode should be set to“Transmit diversity”.

Receive mode should be set to“Receive RX-in/out

diversity”.

ANTTX/RXB

ANTTX/RXA

Antenna mode should be set to “Double

CPRI_E

antenna”.


The maximum transmit power of RF port:

CPRI_W

RRU

M900: 20W/TRX M1800:15W/TRX CPRI0 CPRI1

CPRI5


HUAWEI Confidential

Page 62


S1(PBT + Receive Mode Main and

ANT

Diversity )

Transmit mode should be set to “PBT”.


ANTTX/RXB

ANTTX/RXA

RX-in/out

Antenna mode should be set to “Double CPRI_E

antenna”.


The maximum transmit power of RF port:

CPRI_W

RRU

M900: 40W/TRX M1800:30W/TRX CPRI0 CPRI1

CPRI5


HUAWEI Confidential

Page 63


S2(Transmit Independency or Combining + Receive Mode Main and Diversity)

Transmit mode should be set to “Transmit

ANT ANTTX/RXB

ANTTX/RXA

mode independency or combining”. RX-in/out


CPRI_E

Antenna mode should be set to “Double antenna”.

CPRI_W


RRU

The maximum transmit power of RF port: M900: 30W/TRX CPRI0 CPRI1

M1800:20W/TRX


CPRI5

BBU HUAWEI Confidential

Page 64

Typical Configuration 5 ANT

S2 (PBT + Receive Mode Main and Diversity)

Transmit mode should be set to

ANTTX/RXB

ANTTX/RXA

ANTTX/RXB

ANTTX/RXA

“PBT”.

Receive mode should be set to

RX-in/out

RX-in/out

CPRI_E

CPRI_E

diversity”.

CPRI_W

CPRI_W

The maximum transmit power of

RRU

RRU

“Receive diversity”.

Antenna mode should be set to “Single antenna and receive

RF port: M900: 40W/TRX CPRI0 CPRI1

M1800:30W/TRX

CPRI5


HUAWEI Confidential

Page 65


S2 (PBT + Four Way Receive

ANT

ANT

Diversity)

Transmit mode should be set to “PBT”.

Receive mode should be set to “4 RX-in/out

RX-in/out

CPRI_E

CPRI_E

It also can be configured as non-

CPRI_W

CPRI_W

ring.

RRU

RRU

way receive diversity”.

ANTTX/RXB

ANTTX/RXA

ANTTX/RXB

ANTTX/RXA

Antenna mode should be set to “double antenna and 4 way receive diversity”.

The maximum transmit power of RF port: M900: 40W/TRX

CPRI0 CPRI1

M1800:30W/TRX HUAWEI TECHNOLOGIES Co., Ltd.

CPRI5

BBU HUAWEI Confidential

Page 66


S4 (Transmit Combining +

ANT

Receive Mode Main and Diversity)

Transmit mode should be set to

ANTTX/RXB

ANTTX/RXA

ANTTX/RXB

ANTTX/RXA

“Transmit combining or independency”

RX-in/out

RX-in/out

CPRI_E

CPRI_E

“Single antenna and two receive”

CPRI_W

CPRI_W

The maximum transmit power of

RRU

RRU

Receive mode should be set to “Receive diversity”

Antenna mode should be set to

RF port: M900: 15W/TRX M1800:10W/TRX

CPRI0 CPRI1

CPRI5


HUAWEI Confidential

Page 67


S8(Transmit Combining + Receive Mode Main and Diversity)

Transmit mode should be set to ANTTX/RXA

“Transmit combining or independency”.


AN T

AN T

Antenna mode should be set to

ANTTX/RX B RXin/out CPRI _E

ANTTX/RX A

ANT- ANTTX/RXTX/RX B A RXin/out

ANTTX/RX B RXin/out

CPRI _E

CPRI_ E

ANTTX/RX A

ANT TX/R B RXin/out CPRI _E

“Single antenna and two receive”.

Actually It is combined by two S4.

CPRI_ W

CPRI_ W

CPRI_ W

CPRI_ W

The maximum transmit power of RF

RR U

RR U

RR U

RR U

port: M900: 15W/TRX M1800:10W/TRX

CPR CPR I0 I1

BB U


HUAWEI Confidential

Page 68

CPR I5



HUAWEI Confidential

Page 69

DBS3900 Network Topologies

Network Topologies of the BBU

The BSC and BBUs support multiple network topologies: star, chain, tree, and ring.

E1/T1 can be used to connect BBU and BSC, or interconnect transmission equipment, optical fiber and FE cable can be used to connect BBU and Router.

Network Topologies of the RRU

The BBU and RRUs support two network topologies: star and chain.

RRU connect with BBU by optical fiber.


HUAWEI Confidential

Page 70

Network Topologies of the BBU

The BSC and BBUs support multiple network topologies: star, chain, tree, and ring.


HUAWEI Confidential

Page 71

Network Topologies of the RRU

The BBU and RRUs support two network topologies: star and chain.


HUAWEI Confidential

Page 72

Summary

DBS3900 function and features.

DBS3900 hardware structure, include BBU and RRU etc.

The work mode and typical configuration of the RRU.

Network Topologies of the BBU and RRU.


HUAWEI Confidential

Page 73

Thank You www.huawei.com

RRU

Recommend Documents