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eLTE3.1 DBS3900 LTE TDD

Product Description

Issue 02

Date 2013-10-30

HUAWEI TECHNOLOGIES CO., LTD.

Issue 02 (2013-10-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

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Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and

the customer. All or part of the products, services and features described in this document may not be

within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,

information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

http://www.huawei.com/

mailto:[email protected]


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Contents

1 Product Position and Features ................................................................................................ 4

1.1 Product Position ........................................................................................................................................ 4

1.2 Product Features ........................................................................................................................................ 5

2 Product Structure ...................................................................................................................... 6

2.1 Overview................................................................................................................................................... 6

2.2 Basic Module ............................................................................................................................................ 6

2.2.1 eBBU ............................................................................................................................................... 6

2.2.2 eRRU .............................................................................................................................................. 11

3 Installation Scenarios ............................................................................................................ 16

4 Typical Configurations .......................................................................................................... 18

5 Operation and Maintenance ................................................................................................. 20

5.1 Overview..................................................................................................................................................20

5.2 Characteristics ..........................................................................................................................................20

6 Technical Specifications ........................................................................................................ 22

6.1 DBS3900 station specifications .................................................................................................................22

6.2 Device Specifications ...............................................................................................................................24

6.3 Reliability Specifications ..........................................................................................................................28

6.4 Compliance Standards ..............................................................................................................................28

7 Abbreviations Reference ....................................................................................................... 29


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1 Product Position and Features

1.1 Product Position

The DBS3900 is used for radio access in the LTE system. The DBS3900 mainly

performs Radio Resource Management (RRM) functions such as air interface

management, access control, mobile control, and User Equipment (UE) resource

allocation.

The DBS3900 has two types of basic modules: enterprise baseband unit(eBBU) and

enterprise remote radio unit(eRRU), Figure 1-1 shows the position of the DBS3900 in

the whole system.

Figure 1-1 position of the DBS3900 in the whole system


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1.2 Product Features

Supporting Multiple Frequency Bands

DBS3900 supports frequency bands such as 1.8 GHz, 1.4 GHz, and 400 MHz, which

meets the requirements for multiple frequency bands.

Distributed Architecture

In the distributed architecture, the BBU and RRU of an DBS3900 are separately

deployed and connected through fibers. This minimizes feeder loss and improves

eNodeB coverage. The distributed BBU+RRU architecture allows RRUs to be

mounted on walls or to poles, enabling zero footprint site deployment. As a result,

network deployment costs can be reduced by more than 30% and network deployment

efficiency is significantly improved.

Excellent Performance

Maximum bit rates per cell are up to100 Mbit/s downlink and 50 Mbit/s uplink over 20

MHz wide channels. The excellent performance can help customers preempt the

commanding elevations of the professional mobile broadband industry and get rapid

service expansion.

Flexible Networking

The DBS3900 supports varied frequency bands, enabling customers to provide

services over both readily and newly available frequency bands. Customers can utilize

more than two frequency bands on one wireless network based on the availability of

frequency resources in different areas.

Energy-saving Base Station

RRUs are the most energy-consuming units of an eNodeB. Thanks to the cutting-edge

hardware design of power amplifiers and the use of innovative power amplifier and

consumption management technologies, the RRUs consume 40% less power than

similar products from other vendors.

Anti-network Paralysis

The DBS3900 support “Fallback mode”. When the Core Network Device is down, the

eBBU starts the CNPU which works as a Core Network; it will ensure that all the

services under the eNodeB work normal.


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2 Product Structure

2.1 Overview

The DBS3900 features a distributed architecture and is comprised of two types of

basic modules: eBBU (enterprise BaseBand control Unit) and eRRU (enterprise

Remote Radio Unit). The eBBU and eRRU transmit CPRI signals via fiber optic

cables that connect them through common public radio interface (CPRI) ports . This

kind of architecture satisfies the requirements of setting up enterprise wireless

communication networks .

2.2 Basic Module

2.2.1 eBBU

The eBBU, a baseband unit, performs the following functions:

Provides ports for connection to the core network and processes related transmission protocols.

Provides CPRI ports for communication with eRRUs and processes uplink and

downlink baseband signals.

Manages the entire base station by means of operation and maintenance (OM) and signaling message processing.

Provides an OM channel towards the local maintenance terminal (LMT) or eOMC.

Provides clock ports for clock synchronization, alarm monitoring ports for

environment monitoring, and a Universal Serial Bus (USB) port for commissioning the use of a USB storage device.

1. eBBU exterior

The eBBU has a compact case structure measuring 19 inches wide and 2 U high.

Figure 2-1 shows the eBBU exterior.


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Figure 2-1 eBBU exterior

2. Boards of the eBBU

The eBBU is configured with the following mandatory boards and modules:

LTE main processing and transmission unit (LMPT): Manages the entire

E-UTRAN NodeB (eNodeB) in terms of OM, processes signaling, and provides clock signals for the eBBU.

LTE baseband processing unit (LBBP): Processes baseband signals and CPRI signals.

CNPU (Core network prosessing unit): Provides fallback mode capability.

Fan unit (FAN): Controls the rotation of fans, checks the temperature of the fan

module, and performs heat dissipation for the BBU.

Universal power and environment interface unit (UPEU): Converts -48 V DC

power into +12 V DC, and provides ports for transmission of two RS485 signal inputs and eight Boolean signal inputs.

Note:

“Fallback mode” means that when the Core Network Device is down, the eBBU starts

the CNPU which works as a Core Network, it will ensure that all the services under

the eNodeB work normal. CNPU is an optional board.

Figure 2-2 shows the eBBU frame&slot distribution:

Figure 2-2 eBBU frame&slot distribution

FA

N

（S

lot1

6）

POWER0

（Slot18）

POWER1

（Slot19）

Slot0

Slot7

Slot6

Slot5

Slot4

Slot3

Slot2

Slot1

Figure 2-3 shows the eBBU panel


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Figure 2-3 eBBU panel

Figure 2-4 shows the CNPU panel

Figure 2-4 CNPU panel

CNPU

3. Ports on the eBBU

Table 2-1 describes the eBBU primary ports.

Table 2-1 eBBU ports

Board or module

Port Quantity Connector Function

LMPT FE/GE0 1 RJ45 (1)If there is CNPU, this port

connect to FE/GE0 of CNPU

(2)Not used if there is not CNPU

SFP0 1 SFP Not used

FE/GE1 1 RJ45 Connect transmission network

to core network, electrical

port, can not be used with

SFP1 port simultaneously

SFP1 1 SFP Connect transmission network

to core network, optical port,

can not be used with FE/GE1 port simultaneously

USB port 1 USB Loading software

TST port 1 USB Testing

Commissioning

Ethernet port

1 RJ45 Local maintenance


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Board or module

Port Quantity Connector Function

GPS antenna

port

1 SMA Connect to GPS antenna

CNPU FE/GE0 1 RJ45 Connect to FE/GE0 of LMPT

SFP0 1 SFP Not used

FE/GE1 1 RJ45 Not used

SFP1 1 SFP Not used

USB port 1 USB Loading software

TST port 1 USB Testing

Commissioning

Ethernet port

1 RJ45 Local maintenance

GPS antenna

port

1 SMA Not used

LBBPc CPRI port 6 SFP Interface between the eBBU

and eRRU

LBBPd CPRI port 6 SFP Interface between the eBBU

and eRRU

HEI port 1 QSFP Reserved

UPEUc Power port 1 3W3 Input for -48V DC

MON0 1 RJ45 Transmitting RS485

monitoring signals and

connecting to external monitoring devices

MON1 1 RJ45

EXT-ALM0 1 RJ45 Transmitting dry contact

signals and connecting to

external alarm devices. EXT-ALM1 1 RJ45

4. eBBU configuration

Table 2-2 shows the eBBU configuration:

Table 2-2 eBBU configuration

Name Optional/Mandatory

Typical Configuration Quantity

Maximum Configuration Quantity

Slot That Houses the Board(The Preceding Is Preferred)

Remarks

Subrack Mandato

ry

1 2U high, 19-inch wide,

and with the backplane


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Remarks

LMPT

(Main control board)

Mandatory

1 1 Slot 7

CNPU

(Fault

weakening board)

Optional 1 1 Slot 6 This board is

configured when the

fault weakening

function is required.

Functions of the CNPU

are achieved by loading

software on the LMPT board.

LBBPc

(Baseband board)

Optional 1 6 Slot 3 > 2 > 1 > 0 >

4 > 5

A maximum of six

boards in this type can

be configured. (LBBPc

and LBBPd cannot be configured together.) LBBPd

(Baseband board)

Optional 1 6 Slot 3 > 2 > 1 > 0 >

4 > 5

FANc

(Fan module)

Mandato

ry

1 1 FAN It controls the rotation

of fans, detects the

temperature of the fan

module, and dissipates heat from the eBBU.

UPEUc

(Power

Module)

Mandato

ry

1 2 PWR1 > PWR0 Configure two boards

when the power

consumption of eBBU

exceeds 350W. Two

boards need to be

configured in the following scenarios:

(1)The power

consumption of eBBU

is less than 350 W but

the active/standby mode

power configuration is

required.

(2)The power

consumption of eBBU

exceeds 350 W, that is,

the total number of

configured LMPT and

LBBPc/LBBPd exceeds four.


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Remarks

UEIU

(Environment

monitoring

module)

Optional 0 1 PWR0 When the UPEUc

cannot meet the

monitoring requirement

from users, the UEIU

needs to be configured.

The UEIU shares a slot

with the UPEUc. When

two UPEUc are

configured for hot

backup, the UEIU

cannot be configured

but can be replaced by the second UPEUc.

UFLPb

(FE/GE surge

protection

module)

Optional 0 1 Any slot UFLPb can be

configured in any slot

on eBBU. It is

recommended that the

UFLPb be installed in

slot 6 when eBBU is

configured with one

LMPT. The UFLPb is

preferred to be inserted

into the SLPU surge

protection box. The

UFLPb supports surge

protection on FE/GE

ports.

2.2.2 eRRU

One or more eRRU constitute the radio frequency (RF) part of a distributed base

station. eRRUs can be installed on a pole, wall, or stand. They can also be installed

close to antennas to shorten the feeder length, reduce feeder loss, and improve system

coverage. eRRUs serve to modulate and demodulate baseband signals and RF signals,

process data, amplify power and detect standing waves.

To meet the needs of different application scenarios, eLTE solution provides a variety

of eRRU, including:

eRRU3232: 1.8GHz(1785MHz~1805MHz), 4 PATH, is mainly applied in outdoor macro base stations;

eRRU3253: 1.4GHz(1447MHz~1467MHz), 8 PATH, is mainly applied in government networks;

eRRU3255: 400M(380MHz~400MHz), 2 PATH, is mainly applied in outdoor scenario, also can be applied in indoor scenario;

eRRU3251: 1.8GHz(1785MHz~1805MHz), 2 PATH, is mainly applied in indoor

coverage and linear coverage situations, eg. railway, subway, mine;


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Customers can choose to apply different eRRUs according to the frequency band

available to them.

1. eRRU Exterior

Figure 2-5 shows the eRRU3232 exterior. Figure 2-6 shows the eRRU3253 exterior.

Figure 2-7 shows the eRRU3255 exterior. Figure 2-8 shows the eRRU3251 exterior.

Figure 2-5 eRRU3232 exterior



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2. Ports on an eRRU

An eRRU has a modular structure. Its external ports are located in the cabling cavity at

the bottom of the module. Table 2-3 and Table 2-4 describe the ports on eRRU3232.

Table 2-5 describes the ports on eRRU3253. Table 2-6 describes the ports on

eRRU3255. Table 2-7 describes the ports on eRRU3251.

Table 2-3 Ports on eRRU3232 (DC)

Port Connector Quantity Function

CPRT Port DLC 2 Connect to eBBU

RF Port Type N 4 Connect to antenna


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Ground

Port

OT 2 Ground protection

Power

Supply Port

Easy power receptacle

(press fit type)

2 Receive –48V DC power

RET Port DB9 1 Externally monitor port, get alarm

and state info of external devices,

Support management of external electrical equipment through RS485.

Table 2-4 Ports on eRRU3232 (AC)




Ground

Port


Calibration

Port

3 pin round connector 1 Receive 220V AC power

Power

Supply Port

DB9 1 Externally monitor port, get alarm



Table 2-5 Ports on eRRU3253




Ground

Port


Calibration

Port

Type N 1 Calibrate antenna

Power

Supply Port


(press fit type)






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Table 2-6 Ports on eRRU3255




Ground

Port


Power

Supply Port


(press fit type)




Support management of external

electrical equipment through RS485.

Table 2-7 Ports on RRU3251




Ground Port OT 2 Ground protection

Power

Supply Port


(press fit type)






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3 Installation Scenarios

Typical installation scenarios for the DBS3900 are classified into outdoor and indoor

installation scenarios, as shown in Figure 3-1 and Figure 3-2.

Figure 3-1 DBS3900 Typical Outdoor Installation Scenario

If the DBS3900 is deployed outdoors, it can be installed in an APM30H, or OMB. The

APM30H or OMB provides installation space and outdoor protection for the eBBU,

and supplies –48V DC power to the eBBU and eRRUs.


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Figure 3-2 DBS3900 Typical Indoor Installation Scenario

If the DBS3900 is deployed indoors, the BBU can be installed in a 19-inch cabinet or

rack,, in an Indoor Mini Box (IMB03), or on the wall. The eBBU is able to use the

power supply system and transmission system ofthe existing network.


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4 Typical Configurations

Table 4-1 Typical configurations of the DBS3900 400M frequency band

Configuration MIMO Quantity of LBBP Quantity of RRU

3 × 3MHz 2 × 2 MIMO 1 LBBP 3 RRU




Table 4-2 Typical configurations of the DBS3900 1.4G frequency band





3 × 20MHz 4 × 2 MIMO LBBPd: 1 LBBP 2 RRU

LBBPc: 3 LBBP

3 × 10MHz 8T8R

Beamforming

1 LBBP (only LBBPd

supports)

3RRU

3 × 20MHz 8T8R

Beamforming

1 LBBP (only LBBPd

supports)

3RRU

Table 4-3 Typical configurations of the DBS3900 1.8G 4T4R frequency band




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3 × 5MHz 4 × 2 MIMO 1 LBBP 3RRU




3 × 20MHz 4 × 2 MIMO LBBPd: 1 LBBP 3 RRU

LBBPc: 3 LBBP

Table 4-4 Typical configurations of the DBS3900 1.8G 8T8R frequency band






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5 Operation and Maintenance

5.1 Overview

The DBS3900 supports the O&M system that is based on the man-machine language

(MML) and the graphic user interface (GUI). The O&M system enables a

hardware-independent O&M mechanism and provides powerful O&M functions for

users to meet various O&M requirements.

5.2 Characteristics

Robust Hardware Management, Rapid Fault Location and Rectification

DBS3900 hardware management provides prewarning mechanism and resetting

mechanism to make sure sufficient time are left for troubleshooting before service

interruptions. Recovery can be implemented by resetting to avoid severe accidents in

case faults cannot be cleared in time. When a hardware fault occurs, the DBS3900

alerts the user by generating alarms and flashing indicators and provides suggestions to

guide the user in troubleshooting. After the fault is recovered, the alarm is cleared.

Advanced Software Management and Smooth Upgrade

DBS3900 software management provides upgrade and rollback mechanism, which

allows a software version upgrade and rollback to another version. The upgrade

process includes downloading software files to the OMU using the Security File

Transfer Protocol (FTPS) server, loading the software from the OMU to the flash of

each board, and activating the software in the board flash. This process does not affect

other services and adopts the protection mechanism to raise the success rate of

switching. The effect on available resources is reduced to the lowest level.

Key data is backed up in the process of upgrading. Therefore, a rollback can be

generated immediately when upgrade fails, and the system recovers to a normal state

in a short time. After the upgrade is complete, version consistency check is performed

to verify the version correctness.


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Rich Tracing and Detection Functions

DBS3900 provides hierarchical tracing and detection functions, including user tracing,

interface tracing, message tracing, fault detection on the physical layer, fault detection

on the data link layer, and other fault detection functions, facilitating fault locating.

The tracing information can be saved into files and be checked using the tracing

retrospection tool.


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6 Technical Specifications

6.1 DBS3900 station specifications

Table 6-1 DBS3900 station specifications

Item Specification Notes

Whole system

Maximum Cell Number LBBPc:

6 Cells(4T4R 20MHz)

12 Cells (4T4R 5MHz/4T4R

10MHz/2T2R 5MHz/2T2R

10MHz/2T2R 20MHz)

LBBPd:

12Cells(8T8R 20MHz/8

T8R10MHz/4T4R 20MHz/

4T4R 5MHz/4T4R

10MHz/2T2R 5MHz/2T2R

10MHz/2T2R 20MHz)

Maximum Throughput per

eNodeB

Downlink: 450 Mbit/s

Uplink: 300Mbit/s

Maximum Number of UEs in

RRC-connected Mode per eNodeB

3600

eRRU maximum distance LBBPc: 20km When cascaded to three levels with

10M/20M, the maximum distance

between two consecutive eRRU

cannot exceed 17km.

LBBPd: 38km


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eRRU cascading LBBPc: 3 levels to the max 5M 2T2R 3-level cascading

10M 2T2R 3-level cascading


Only eRRU3251 supports cascading

LBBPd: 4 levels to the max 5M 2T2R 4-level cascading



Only eRRU3251 supports cascading

Networking Star type/Chain type/Load

sharing

LBBPc specification

Max cell number of per

LBBPc

1 20M 4T4R


LBBPc

3 20M 2T2R/1T1R

10M 4T4R/2T2R/1T1R

5M 4T4R/2T2R/1T1R

Back-to-back combination

between eRRU

eRRU number of per cell 2

Max supported combined cell

number of per LBBPc

3*5M 2T2R

3*10M 2T2R

1*20M 2T2R

Back-to-back combination in

eRRU



number of per LBBPc

3*5M 2T2R

3*10M 2T2R

1*20M 2T2R

LBBPd specification


LBBPd

3 20M 4T4R/2T2R/1T1R

10M 4T4R/2T2R/1T1R

5M 4T4R/2T2R/1T1R

3M 4T4R/2T2R/1T1R

Back-to-back combination between eRRU



number of per LBBPd

3*5M 2T2R

3*10M 2T2R

3*20M 2T2R

Back-to-back combination in

eRRU



number of per LBBPd

3*5M 2T2R

3*10M 2T2R

3*20M 2T2R

Indoor combination between eRRU number of per cell 6


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Notes:

“combination between eRRU”means that multiple eRRUs merge into one cell which

apply only 5M/10M/20M system bandwidth, and only supports 2T2R of eRRU.

“combination in eRRU”means that several paths of a eRRU merge into one cell,

namely the antennas of a eRRU split into multiple 2-path and then merge into the same

cell.

6.2 Device Specifications

Table 6-2 eBBU Device Specifications

Item Specification

Dimensions (H×W×D) 86 mm ×442 mm ×310 mm

Weight ≤ 12 kg (In full configuration)

Input Power -48 V DC(-38.4 V DC ～ -57 V DC)

Temperature 20°C ～ +55°C

Relative Humidity 5% RH ～ 95% RH

Atmospheric Pressure 70 kPa ～ 106 kPa

eRRU Max supported combined cell

number of per LBBPd

3*5M 1T1R

3*10M 1T1R

3*20M 1T1R

3*5M 2T2R

3*10M 2T2R

3*20M 2T2R

Indoor combination in eRRU eRRU number of per cell 1


number of per LBBPd

3*5M 1T1R

3*10M 1T1R

3*20M 1T1R

3*5M 2T2R

3*10M 2T2R

3*20M 2T2R


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Item Specification

Power consumption 1 LMPT + 1 LBBP 165W

1 LMPT + 2 LBBP 255W











Ingress Protection Rating IP20

CPRI Port 6 CPRI ports per LBBP

Standard CPRI4.1 port, compatible with CPRI3.0

CPRI port supports: automatic switching between 2.4576Gbps and4.9152Gbps

Transmission Port 2 FE/GE electrical port

Or 2 FE/GE optical port

Or 1 FE/GE electrical port and 1 FE/GE optical port

Cell Max cell number:12

Cell frequency bandwidth:3MHz/5MHz/10MHz/20MHz；

(only eRRU3255 supports 3MHz)

Clock synchronization GPS

Cooling Forced air cooling(Left in, right out)

Table 6-3 eRRU3232(4T4R) Device Specifications

Item Specification

Frequency Band and

Bandwidth

Frequency Band Bandwidth

1.8GHz:

1785 MHz ～1805 MHz

1785 MHz ～1800MHz

5MHz/10MHz/20MHz

Dimensions(H×W×D) 480mm×270mm×140mm

Weight 18.5kg


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Item Specification

Input Power -48V DC, voltage range:-36V DC ～ -57V DC

220V AC, voltage range:90V AC ~ 290V AC

Maximum output Power 4 × 20W

Power consumption Typical average power consumption:350W

Typical max power consumption:465W

Receiving sensitivity -103.5dBm

Temperature -40℃ ～ +55℃





Item Specification

Frequency Band and

Bandwidth


1.4GHz:

1447MHz～1467MHz

10MHz/20MHz


Weight 24kg

Input Power -48V DC, voltage range: -32V DC ～ -60V DC

Maximum Output Power 8 × 8W @ 2:2 (time slot ratio UL: DL)

8 × 6W @ 1:3 (time slot ratio UL: DL)



Receiving sensitivity -103dBm

Temperature -40℃ ～ +45℃ @ 2: 2+8W/Path or 1: 3+6W/Path

-40℃ ～ +50℃ @ 2: 2+6W/Path or 1: 3+5W/Path





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Item Specification

Frequency Band and

Bandwidth


400MHz:

380MHz～400MHz

3MHz/5MHz/10MHz/20M

Hz


Weight <18kg

Input Power -48V DC,voltage range:-36V DC ～ -60V DC

Maximum Output Power 2× 20W



Receiving sensitivity -103.5dBm @5MHz/10MHz/20MHz

-104.5dBm @3MHz

Temperature -40℃～ +55℃





Item Specification

Frequency Band and

Bandwidth


1800MHz: 1785MHz～1805MHz

5MHz/10MHz/20MHz


Weight <12.5kg

Input Power -48V DC, voltage range: -36V DC ～ -60V DC

Maximum Output Power 2× 20W

Power consumption Typical average power consumption: 190W

Typical max power consumption: 250W

Receiving sensitivity -102dBm

Temperature -40℃ ～ +50℃



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Item Specification



6.3 Reliability Specifications

Table 6-7 Reliability specifications

Item Specification

System Availability ≥99.999%

Mean Time between Failures ≥155,000 hours

Mean Time to Repair ≤1hour

System Restarting Time <450s

6.4 Compliance Standards

Table 6-8 Compliance standards

Item Standard

Storage ETSI EN300019-1-1 V2.1.4 (2003-04) class1.2 ”Weatherprotected, not

temperature-controlled storage locations”

Transportation ETSI EN300019-1-2 V2.1.4 (2003-04) class 2.3 ”Public transportation”

Anti-seismic

Performance Interim Provisions for Test of Anti-seismic Performances of

Telecommunications Equipment (Telecommunication Industry Standard of the People's Republic of China)

Electromagnetic

Compatibility (EMC)

The eNodeB meets the Electromagnetic Compatibility (EMC)

requirements and complies with the following standards:

R&TTE Directive 1999/5/EC

R&TTE Directive 89/336/EEC

3GPP TS 36.113

ETSI EN 301489-1/23

ETSI EN 301908-1 V2.2.1 (2003-10)

ITU-R SM.329-10

CTA

CE

RoHS


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7 Abbreviations Reference

Table 7-1 Abbreviations reference table

Abbreviation Full name

ANR Automatic Neighboring Relation

APM Advanced Power Module

eBBU enterprise BaseBand control Unit

CAPEX Capital Expenditure

CDMA Code Division Multiple Access

CNPU Core Network Prosessing Unit

CPRI Common Public Radio Interface

DBS Distribution Base Station

E-UTRAN Evolved UMTS Terrestrial Radio Access Network

FAN Fan Unit

FE Fast Ethernet

GE Gigabit Ethernet

GPS Global Positioning System

GSM Global System for Mobile communications

IBBS Integrated Battery Backup System

ICIC Inter-Cell Interference Coordination

IMB Indoor Mini Box

IP Internet Protocol

LMT Local Maintenance Terminal

LTE Long Term Evolution

MIMO Multiple Input Multiple Output

http://3ms.huawei.com/term/docMaintain/termOperate.do?method=listTermAndDefinition&f_id=20091010000332&fd_id=47365&node_id=1-9


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Abbreviation Full name

MRO Mobility Robust Optimization

MTBF Mean Time Between Failures

MTTR Mean Time To Recovery

OM Operation and Maintenance

OPEX Operating Expenditure

RGPS Remote Global Positioning System

RCU Remote Control Unit

RET Remote Electrical Ttilt

RRM Radio Resource Management

eRRU enterprise Remote Radio Unit

TCO Total Cost of Ownership

TMC Transmission Cabinet

UMTS Universal Mobile Telecommunications System

UPEU Universal Power and Environment Interface Unit

USB Universal Serial Bus

UTRA UMTS Terrestrial Radio Access (ETSI)

UTRAN UMTS Terrestrial Radio Access Network

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