nodeb technical description(v200_01)

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NodeB

V200

Technical Description

Issue 01

Date 2009-02-10

Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.


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Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any

assistance, please contact our local office or company headquarters.

Huawei Technologies Co., Ltd.

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Copyright Huawei Technologies Co., Ltd. 2009. 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 the property of Huawei Technologies Co., Ltd.

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

Notice

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 the statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Proprietary and Confidential

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Contents

About This Document.....................................................................................................................1

1 Changes in the NodeB Technical Description.....................................................................1-1

2 System Principle of the NodeB................................................................................................2-1

2.1 Logical Structure of the BBU3900..................................................................................................................2-2

2.2 Logical Structure of the RRU..........................................................................................................................2-3

2.3 Logical Structure of the WRFU/MRFU..........................................................................................................2-4

3 Typical Configurations of the NodeB....................................................................................3-1

3.1 Typical Configurations of the BTS3900.........................................................................................................3-2

3.2 Typical Configurations of the BTS3900A............................................................................................... .......3-3

3.3 Typical Configurations of the DBS3900.........................................................................................................3-3

4 Monitoring Principles of the NodeB......................................................................................4-1

5 Topologies of the NodeB..........................................................................................................5-15.1 Topology on the Iub Interface.........................................................................................................................5-2

5.1.1 ATM-Based Topologies.........................................................................................................................5-2

5.1.2 IP-Based Topologies..............................................................................................................................5-4

5.2 Topology on the CPRI Interface.....................................................................................................................5-4

6 Operation and Maintenance of the NodeB...........................................................................6-1

6.1 OM Modes of the NodeB................................................................................................................................6-2

6.2 OM Functions of the NodeB...........................................................................................................................6-3

7 Reliability of the NodeB...........................................................................................................7-1

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Figures

Figure 2-1 Logical structure of the BBU3900......................................................................................................2-2

Figure 2-2 Logical structure of the RRU..............................................................................................................2-3

Figure 2-3 Logical structure of the WRFU/MRFU..............................................................................................2-5

Figure 3-1 Typical configurations of the BTS3900.............................................................................................3-2

Figure 3-2 Typical configurations of the BTS3900A..........................................................................................3-3

Figure 4-1 Monitoring principles of the BTS3900...............................................................................................4-1

Figure 4-2 Monitoring principles of the BTS3900A............................................................................................4-2

Figure 4-3 Monitoring principles of the DBS3900..............................................................................................4-3

Figure 5-1 Star topology.......................................................................................................................................5-2

Figure 5-2 Chain topology...................................................................................................................................5-3

Figure 5-3 Tree topology......................................................................................................................................5-3

Figure 5-4 IP hub topology..................................................................................................................................5-4

Figure 5-5 Typical topology between the BBU3900 and the RRUs....................................................................5-5

Figure 6-1 OM network of the NodeB.................................................................................................................6-2

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Tables

Table 3-1 Typical configurations of the BTS3900...............................................................................................3-2

Table 3-2 Typical configurations of the BTS3900A............................................................................................3-3

Table 3-3 Typical configurations of the DBS3900 (with RRU3804)..................................................................3-4

Table 3-4 Typical configurations of the DBS3900 (with RRU3801C)................................................................3-4

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About This Document

Purpose

This document describes the NodeB products in terms of system principle, configuration type

and topology.

Product Version

The following table lists the product versions related to this document.

Product Name Product Version

BTS3900 WCDMA (hereinafter referred to

as BTS3900)

V200R011

BTS3900A WCDMA (hereinafter referred

to as BTS3900A)

V200R011

DBS3900 WCDMA (hereinafter referred to

as DBS3900)

V200R011

BBU3900 V200R011

Intended Audience

This document is intended for:

l Network planners

l

Field engineersl System engineers

Change History

For changes in the document, see 1 Changes in the NodeB Technical Description.

Organization

1 Changes in the NodeB Technical Description

This describes the changes in theNodeB Technical Description.

2 System Principle of the NodeB

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System Principle of the NodeB describes the principles of BBU3900 (baseband processing unit),

RRU (remote radio unit), and WRFU/MRFU (RF module).

3 Typical Configurations of the NodeB

This describes the typical configurations of the BTS3900, BTS3900A, DBS3900.

4 Monitoring Principles of the NodeB

This describes the monitoring principles of the BTS3900, BTS3900A, and DBS3900.

5 Topologies of the NodeB

This describes the topologies of the NodeB, which consist of the topology on the Iub interface

and CPRI interface.

6 Operation and Maintenance of the NodeB

The OM subsystem of the NodeB manages, monitors, and maintains the software, hardware,and configuration of the NodeB. The OM subsystem also provides various OM modes and

multiple maintenance platforms to meet different maintenance requirements.

7 Reliability of the NodeB

The NodeB features a new system architecture and a complete redundancy design. In addition,

the NodeB employs Huawei large-capacity ASIC chips to enhance the integrity of modules and

to reduce the number of parts, thus significantly improving the system reliability.

Conventions

Symbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol Description

Indicates a hazard with a high level of risk, which if not

avoided,will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, which

if not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,

performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or save

time.

Provides additional information to emphasize or supplement

important points of the main text.

General Conventions

The general conventions that may be found in this document are defined as follows.

About This Document

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Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are in

boldface. For example, log in as userroot.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier New.

Command Conventions

The command conventions that may be found in this document are defined as follows.

Convention DescriptionBoldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated by

vertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of all

items can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated by

vertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.

Convention Description

Boldface Buttons, menus, parameters, tabs, window, and dialog titles

are in boldface. For example, clickOK.

> Multi-level menus are in boldface and separated by the ">"

signs. For example, choose File > Create > Folder .

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

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Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A means

the two keys should be pressed in turn.

Mouse Operations

The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without movingthe pointer.

Double-click Press the primary mouse button twice continuously and

quickly without moving the pointer.

Drag Press and hold the primary mouse button and move the

pointer to a certain position.

About This Document

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1Changes in the NodeB Technical DescriptionThis describes the changes in theNodeB Technical Description.

01 (2009-02-10)

This is the field trial release.

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2 System Principle of the NodeBAbout This Chapter

System Principle of the NodeB describes the principles of BBU3900 (baseband processing unit),

RRU (remote radio unit), and WRFU/MRFU (RF module).

2.1 Logical Structure of the BBU3900

The BBU3900, which features a modular design, consists of the transport subsystem, baseband

subsystem, control subsystem, and power module.

2.2 Logical Structure of the RRU

The RRU, which features a modular design, consists of the interface module, transceiver (TRX),

Power Amplifier (PA), filter, Low Noise Amplifier (LNA), and power module.

2.3 Logical Structure of the WRFU/MRFU

The WRFU/MRFU, which features a modular design, consists of the interface module,

transceiver (TRX), Power Amplifier (PA), filter, and Low Noise Amplifier (LNA).

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2.1 Logical Structure of the BBU3900

The BBU3900, which features a modular design, consists of the transport subsystem, baseband

subsystem, control subsystem, and power module.

Figure 2-1 shows the logical structure of the BBU3900.

Figure 2-1 Logical structure of the BBU3900

Transport Subsystem

The transport subsystem has the following functions:

l Providing physical ports for data communication between the NodeB and the RNC

l Providing OM (Operation & Maintenance) channels between the BBU3900 and the OMC

(LMT or M2000) for operation and maintenance

Baseband Subsystem

The baseband subsystem processes uplink and downlink baseband data. The functions of the

baseband subsystem are performed by the following modules:

l Uplink baseband data processing module: Consists of the demodulation unit and the

decoding unit. In this module, uplink baseband data is processed into despreading soft

decision symbols after access channel searching, access channel demodulation, and

dedicated channel demodulation. The symbols are then sent to the RNC through the

transport subsystem after decoding and Frame Protocol (FP) processing.

l Downlink baseband data processing module: Consists of the modulation unit and the coding

unit. The module receives the service data from the transport subsystem and sends the

service data to the FP processor for FP processing. The signals are finally sent to the

interface module after encoding, transport channel mapping, physical channel generating,

framing, spreading, modulation, and power control combination.

In the baseband subsystem, the BBU3900 has an integrated CPRI interface module that connectsthe BBU3900 to the RF module.


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Control Subsystem

The control subsystem manages the entire NodeB. The subsystem performs OM, processes

signaling, and provides the system clock.

l

The OM module has functions such as equipment management, configuration management,alarm management, software management, and commissioning management.

l The signaling processor has functions such as NodeB Application Part (NBAP) signaling

processing, Access Link Control Application Part (ALCAP) processing, Stream Control

Transmission Protocol (SCTP) processing, and logical resource management.

l The clock module has functions such as providing a phase-locked line clock extracted from

the Iub interface (the clock is extracted from an E1, optical port, or FE), a GPS clock, an

IP clock, or an external clock. The BBU3900 extracts the clock from the Iub interface and

then provides a system clock for the NodeB after frequency dividing, phase locking, and

phase adjusting.

Power ModuleThe power module converts -48 V or +24 V DC power into the power required by the boards

and provides a port to connect to an external monitoring device.

2.2 Logical Structure of the RRU

The RRU, which features a modular design, consists of the interface module, transceiver (TRX),

Power Amplifier (PA), filter, Low Noise Amplifier (LNA), and power module.

Figure 2-2 shows the logical structure of the RRU.

Figure 2-2 Logical structure of the RRU

Interface Module

The functions of the interface module are as follows:

l Receiving downlink baseband data from the BBU

l Transmitting uplink baseband data to the BBU

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l Forwarding data from the cascaded RRUs

TRX

The TRX has two RX channels and one TX channel for RF signals.

l The RX channels perform the following functions:

Down-conversion of the received signals to IF signals

Amplification of the IF signals

Analog-to-digital conversion

Digital down-conversion

Matched filtering

Digital Automatic Gain Control (DAGC)

l The TX channel performs the following functions: Shaping and filtering of downlink spread spectrum signals

Digital-to-analog conversion

Up-conversion of the IF signals to the TX band

PA

The PA adopts the DPD and A-Doherty technologies to amplify low-power RF signals from the

TRX.

Filter

The filters consist of a duplex filter and an RX filter. The filter performs the following functions:

l The duplex filter multiplexes one RX and one TX signals over RF channels so that they

can share one antenna channel. In addition, it filters RX and TX signals.

l The RX filter filters one RX signal.

LNA

The LNA amplifies the signals received from the antenna system.

Power Module

The power module supplies power to other modules of the RRU.

2.3 Logical Structure of the WRFU/MRFU

The WRFU/MRFU, which features a modular design, consists of the interface module,

transceiver (TRX), Power Amplifier (PA), filter, and Low Noise Amplifier (LNA).

Figure 2-3 shows the logical structure of the WRFU/MRFU.


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Figure 2-3 Logical structure of the WRFU/MRFU

Interface Module

The functions of the interface module are as follows:

l Receiving downlink baseband data from the BBU

l Transmitting uplink baseband data to the BBU

l Forwarding the data sent from the cascaded WRFUs/MRFUs

TRX

The TRX provides two RX channels and one TX channel for RF signals.

l The RX channels perform the following functions:

Down-conversion of the received signals to IF signals

Amplification of the IF signals

Analog-to-digital conversion

Digital down-conversion

Matched filtering

Digital Automatic Gain Control (DAGC)

l The TX channel performs the following functions:

Shaping and filtering of downlink spread spectrum signals

Digital-to-analog conversion

Up-conversion of the IF signals to the TX band

PA

The PA adopts the DPD and A-Doherty technologies to amplify low-power RF signals from the

TRX.

Filter

The filters consist of a duplex filter and an RX filter. The filters perform the following functions:

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l The duplex filter multiplexes one RX and one TX signals over RF channels so that they

can share one antenna channel. In addition, it filters RX and TX signals.

l The RX filter filters one RX signal.

LNA

The LNA amplifies the signals received from the antenna system.

Power Module

The power module supplies power to other modules of the RFU.


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3 Typical Configurations of the NodeBAbout This Chapter

This describes the typical configurations of the BTS3900, BTS3900A, DBS3900.

3.1 Typical Configurations of the BTS3900

The BTS3900 supports omni-directional, 2-sector, 3-sector, and 6-sector configurations, and

smooth capacity expansion from 1 x 1 to 3 x 8.

3.2 Typical Configurations of the BTS3900A

The BTS3900A supports omni-directional, 2-sector, 3-sector, and 6-sector configurations, and


3.3 Typical Configurations of the DBS3900

The capacity of the DBS3900 can be expanded through addition of modules or license upgrade.

When license upgrade is required, the capacity can be expanded by 16 cells at a time. In the

early phase of network construction, you can choose a small-capacity configuration (such as 3

x 1 configuration). When the number of subscribers increases, you can smoothly expand the

small-capacity configuration to a large-capacity configuration (such as 3 x 2 or 3 x 4

configuration).

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3.1 Typical Configurations of the BTS3900

The BTS3900 supports omni-directional, 2-sector, 3-sector, and 6-sector configurations, and


The BTS3900 is configured with boards and modules such as the WMPT, WBBP, and WRFU

or MRFU. The WMPT and WBBP are installed in the BBU3900. Figure 3-1 shows the typical

configurations of the BTS3900, where the WBBP supporting three cells and WRFU/MRFU

supporting 80 W and four carriers are taken as an example.

Figure 3-1 Typical configurations of the BTS3900

Table 3-1 Typical configurations of the BTS3900

Configuration Number ofWBBPs

Number ofWMPTs

Number of WRFUs/MRFUs (No TXDiversity)

3 x 1 1 1 3

3 x 2 2 1 3

3 x 3 3 1 3

3 x 4 4 1 3

NOTE

N x M = sector x carrier. For example, 3 x 1 indicates that each of the three sectors has one carrier.


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3.2 Typical Configurations of the BTS3900AThe BTS3900A supports omni-directional, 2-sector, 3-sector, and 6-sector configurations, and


The BTS3900A is configured with boards and modules such as the WMPT, WBBP, and WRFU

or MRFU. The WMPT and WBBP are installed in the BBU3900. Figure 3-2 shows the typical

configurations of the BTS3900A, where the WBBP supporting three cells and WRFU/MRFU

supporting 80 W and four carriers are taken as an example.

Figure 3-2 Typical configurations of the BTS3900A

Table 3-2 Typical configurations of the BTS3900A

Configuration Number ofWBBPs

Number ofWMPTs

Number of WRFUs/MRFUs (No TXDiversity)

3 x 1 1 1 3

3 x 2 2 1 3

3 x 3 3 1 3

3 x 4 4 1 3

NOTE

N x M = sector x carrier. For example, 3 x 1 indicates that each of the three sectors has one carrier.

3.3 Typical Configurations of the DBS3900

The capacity of the DBS3900 can be expanded through addition of modules or license upgrade.When license upgrade is required, the capacity can be expanded by 16 cells at a time. In the

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early phase of network construction, you can choose a small-capacity configuration (such as 3

x 1 configuration). When the number of subscribers increases, you can smoothly expand the

small-capacity configuration to a large-capacity configuration (such as 3 x 2 or 3 x 4

configuration).

Table 3-3 and Table 3-4 show the typical configurations of the DBS3900, where the WBBPsupporting three cells is taken as an example.

Table 3-3 Typical configurations of the DBS3900 (with RRU3804)

Configuration Number of WBBPs Number of RRU3804s (No TXDiversity)

3 x 1 1 3

3 x 2 2 3

3 x 3 3 3

3 x 4 4 3

Table 3-4 Typical configurations of the DBS3900 (with RRU3801C)

Configuration Number of WBBPs Number of RRU3801Cs (NoTX Diversity)

3 x 1 1 3

3 x 2 2 3

3 x 3 3 6

3 x 4 4 6

NOTE

l N x M = sector x carrier. For example, 3 x 1 indicates that each of the three sectors has one carrier.

l Assume that the number of RRUs is a when the RRUs are configured in no TX diversity mode. Then,

under the same configuration, the number of RRUs is 2a when the TX diversity mode is applied.


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4Monitoring Principles of the NodeBThis describes the monitoring principles of the BTS3900, BTS3900A, and DBS3900.

Monitoring Principles of the BTS3900

Figure 4-1 shows the monitoring principles of the BTS3900, where a UPEU configuration is

taken as an example.

Figure 4-1 Monitoring principles of the BTS3900

Monitoring Principles of the BTS3900A

Figure 4-2 shows the monitoring principles of the BTS3900A, where a UPEU configuration is


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Figure 4-2 Monitoring principles of the BTS3900A

Monitoring Principles of the DBS3900

Figure 4-3 shows the monitoring principles of the DBS3900, where a UPEU configuration is


4 Monitoring Principles of the NodeB

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Figure 4-3 Monitoring principles of the DBS3900

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5 Topologies of the NodeBAbout This Chapter

This describes the topologies of the NodeB, which consist of the topology on the Iub interface

and CPRI interface.

5.1 Topology on the Iub Interface

The NodeB supports multiple topologies on the Iub interface, and it supports ATM transport

and IP transport.

5.2 Topology on the CPRI Interface

This describes the topology on the CPRI interface. The network topology between the

BBU3900 and the RRUs can be the star, chain, or ring topology.

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5.1 Topology on the Iub Interface

The NodeB supports multiple topologies on the Iub interface, and it supports ATM transport

and IP transport.

5.1.1 ATM-Based Topologies

The NodeB supports multiple network topologies, such as star, tree, and chain, when the ATM

protocol stack is applied.

5.1.2 IP-Based Topologies

In terms of IP-based topologies, the NodeB is enhanced to support the IP hub topology in addition

to the traditional star, chain and star topology.

5.1.1 ATM-Based Topologies

The NodeB supports multiple network topologies, such as star, tree, and chain, when the ATMprotocol stack is applied.

Star Topology

The star topology is the most common topology and is applicable to densely populated areas.

Figure 5-1 shows the star topology.

Figure 5-1 Star topology

Advantages:

l

The NodeB is directly connected to the RNC. Therefore, the star topology features easymaintenance, engineering, and capacity expansion.


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l Direct data transmission is implemented between the NodeB and the RNC, reducing the

number of nodes that signals travel through and enhancing transmission reliability.

Disadvantage: The star topology requires more transmission resources than other topologies.

Chain Topology

The chain topology is applicable to belt-shaped and sparsely populated areas, such as areas along

highways and railways.

Figure 5-2 shows the chain topology.

Figure 5-2 Chain topology

Advantage: The chain topology can reduce cost in transmission devices, engineering,

construction, and transmission link lease.

Disadvantages:

l Signals travel through many nodes, leading to low transmission reliability.

l Faults in the upper-level NodeB may affect the operation of the lower-level NodeB.

l The number of levels in a chain topology cannot exceed five.

Tree Topology

The tree topology is applicable to areas in which the network architecture, site distribution, and

subscriber distribution are complicated, for example, hot spot areas in which subscribers are

widely distributed.

Figure 5-3 shows the tree topology.

Figure 5-3 Tree topology

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Advantage: The tree topology requires fewer transmission cables than the star topology.

Disadvantages:

l Signals travel through many nodes, leading to low transmission reliability and difficulties

in construction and maintenance.

l Faults in the upper-level NodeB may affect the operation of the lower-level NodeB.

l Capacity expansion is difficult because it may require changes in the network architecture.

l The number of levels in a tree topology cannot exceed five.

5.1.2 IP-Based Topologies

In terms of IP-based topologies, the NodeB is enhanced to support the IP hub topology in addition

to the traditional star, chain and star topology.

Figure 5-4 IP hub topology

The microwave topology is a typical hub topology and the most important hub scenario.

Convergence devices, such as the hub NodeB or transmission gateway, can be placed at the cross

points of each tree topology. Typically, the hub NodeB is used for the first-level convergence.

Based on capacity requirements, the hub NodeB or the transmission gateway can be used for

the second-level convergence. Figure 5-4 shows an example.

5.2 Topology on the CPRI Interface

This describes the topology on the CPRI interface. The network topology between the

BBU3900 and the RRUs can be the star, chain, or ring topology.

Figure 5-5 shows the typical topologies between the BBU3900 and the RRUs.


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Figure 5-5 Typical topology between the BBU3900 and the RRUs

NOTE

When the chain topology is applied between the BBU3900 and the RRUs, a maximum of eight cascading

levels at 2.5 Gbit/s and four cascading levels at 1.25 Gbit/s can be supported if one RRU supports one 2-

way RX/1-way TX cell.

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6Operation and Maintenance of the NodeBAbout This Chapter

The OM subsystem of the NodeB manages, monitors, and maintains the software, hardware,

and configuration of the NodeB. The OM subsystem also provides various OM modes and

multiple maintenance platforms to meet different maintenance requirements.

6.1 OM Modes of the NodeB

The NodeB supports two OM platforms: LMT and M2000.

6.2 OM Functions of the NodeB

The NodeB OM system provides functions of commissioning management, equipment

management, software management, and alarm management.

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6.1 OM Modes of the NodeB

The NodeB supports two OM platforms: LMT and M2000.

The features of the NodeB OM modes are as follows:

l The NodeB supports the following OM modes:

Local maintenance: The NodeB is maintained on the LMT through the local Ethernet

port of the NodeB.

Remote maintenance: The NodeB is maintained through the IP route provided by the

RNC. The maintenance is performed on the LMT in an RNC equipment room or on the

M2000 client in the centralized maintenance center.

Reverse maintenance: Another NodeB under the same RNS is maintained on the LMT

through the local Ethernet port of a NodeB and the IP route provided by the RNC.

l The NodeB supports the Bootstrap Protocol (BOOTP) and the Dynamic Host ConfigurationProtocol (DHCP). When data is not configured or the NodeB is faulty, the NodeB

automatically sets up an OM channel to enhance system reliability and to perform remote

troubleshooting.

l The NodeB supports configuration baseline which simplifies the configuration rollback

process and enhances reliability of configuration rollback.

l The NodeB provides the intelligent out-of-service function. Before the NodeB is out of

service, the UE is handed over to another 2G or 3G cell when the NodeB gradually reduces

the cell pilot power. Such a handover prevents service disruption.

l The NodeB provides the RRU topology scanning function, which enables automatic

monitoring of the RRU topology in real time to help reduce manual intervention.l The NodeB provides the complete system self-detection function, and thus local

commissioning is not required.

Figure 6-1 shows the NodeB OM network.

Figure 6-1 OM network of the NodeB

The NodeB OM network consists of the following elements:


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l LMT: refers to the OM terminal that is installed with the Huawei Local Maintenance

Terminal software group and is connected to the OM network of NEs. Through the LMT,

you can operate and maintain one NodeB.

l NodeB: an object to be maintained.

l M2000: maintains multiple NodeB systems in a centralized way.

l OM channel: provides maintenance channels between the NodeB and the LMT or M2000.

6.2 OM Functions of the NodeB

The NodeB OM system provides functions of commissioning management, equipment

management, software management, and alarm management.

Commissioning Management

Commissioning management has the following functions:

l Equipment performance test: CPU usage test, clock source quality test, and power detection

l Routine test, such as E1/T1 performance statistics

l Service performance test: RF performance test, UL channel scanning, and service resource

occupancy statistics

NOTE

The RF performance test is also referred to as the 141 test. It is based on TS25.141 in the 3GPP protocols,

which aims at testing the NodeB RF performance.

Equipment ManagementEquipment management consists of equipment maintenance and data configuration. Equipment

management has the following functions:

l Maintaining the equipment: board reset, equipment status management, equipment self-

testing, active/standby switchover, and time correction

l Configuring the equipment: configuring, querying, and backing up equipment parameters,

such as the NodeB hardware, clock, algorithm, and RF parameter configuration

Software Management

Software management has the following functions:l Activating the software

l Checking the consistency of software and hardware versions

l Querying hardware and software versions

l Upgrading the software version

Alarm Management

Alarm management consists of equipment alarm management and environment alarm

management.

l Equipment alarm management

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The alarm management system can detect and report equipment faults in real time. The

LMT or the M2000 can display alarm information and provide alarm-handling suggestions.

The alarm management system of the M2000 is connected to an alarm box through a serial

port and supports both audible and visual alarms. The maintenance personnel can subscribe

to the alarm information that can be forwarded to their handsets or pagers so that they canhandle the faults in time.

l Environment alarm management

Typically, equipment rooms of NodeBs are unmanned and distributed over a vast area. The

equipment in such a room works in a relatively adverse environment, and it may be damaged

because of fire, water immersion, or floods. To help you handle such emergencies, the

NodeB provides a complete environment alarm management system.

The functions of alarm management are as follows:

l Alarm testing

l Alarm reporting

l Alarm shielding

l Alarm affirming

l Alarm pre-processing

l Alarm correlation processing

l Alarm handling suggestions providing

Security Management

The operation rights for maintenance personnel are divided into multiple levels when both the

NodeB and the M2000 are applied. This ensures that the running equipment is free from improperoperation.

Environment Monitoring

The environment monitoring system provides customized solutions related to door control,

infrared, smoke, water damage, humidity, and temperature monitoring.


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7 Reliability of the NodeBThe NodeB features a new system architecture and a complete redundancy design. In addition,

the NodeB employs Huawei large-capacity ASIC chips to enhance the integrity of modules and

to reduce the number of parts, thus significantly improving the system reliability.

System Reliability

The NodeB has a reliability design with features such as load sharing and redundancy

configuration. It adopts the optimized fault detection and isolation technology of the boards and

system, thus greatly enhancing system reliability.

Redundancy design

l The main control board, transmission board, power supply unit, and FAN unit in the NodeB

all support redundancy. The BBU supports load sharing.

l The CPRI port between the BBU and the RF modules supports the ring topology. When

one CPRI link is faulty, the NodeB can automatically switch to another CPRI link.

l The key data such as software versions and data configuration files in the NodeB supports

redundancy.

Reliability design

l The NodeB can automatically perform self-detection and diagnose hardware failures and

environment problems, and then report alarms. It also attempts to conduct self-healing to

clear faults. If the self-healing fails, the faulty unit is automatically isolated.

l The function of route load sharing at the IP layer is optimized, and the protection at the

route level is supported.

This function is implemented through combination with the end-to-end detection

mechanism.

With this function, the NodeB can help the RNC to ensure that the users on the faulty

links, in the case of load sharing, can switch to normal links. In this way, the NodeB

can implement user switch among different interfaces on the same board.

Hardware Reliability

Anti-misinsertion design of boards

When a board is wrongly inserted into the slot of another board, the mistaken board cannot beconnected to the backplane, and in this way, the equipment is free from damage.

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Overtemperature protection

When the ambient temperature of the PA on the RF module is too high, the NodeB generates

overtemperature alarms and immediately shuts down the PA to prevent it from damage.

Reliable power supply

l The NodeB has wide-range voltage and surge protection functions.

l The NodeB provides power failure protection for programs and data.

l The boards protect power supply against overvoltage, overcurrent, and reverse connection

of positive and negative poles.

l The NodeB supports hierarchical shutdown. The outdoor NodeB performs shutdown of

PAs based on the backup power capacity.

All-round surge protection design

The NodeB takes surge protection measures on AC and DC power sockets, input and outputsignal ports (E1 port, interconnection port, and Boolean alarm port), antenna connectors, and

GPS ports.

Software Reliability

The software reliability is embodied in the redundancy of key files and data and the powerful

error tolerance of software.

Redundancy

The NodeB provides the backup function for key files and data, such as software and data

configuration files, to ensure proper operation of the NodeB when errors occur in these files anddata.

l Redundancy of software versions: The NodeB provides separate redundancy for software

versions including the BootROM software version to avoid version problems. If one version

becomes faulty, the NodeB switches to the backup version.

l Redundancy of data configuration files: The NodeB provides separate redundancy for data

configuration files to avoid interrupting the running of the files. If the current file becomes

faulty, the NodeB can keep working properly with the backup file.

l Backup of boards: The two same boards can work in active and standby mode. When the

active board is disabled or faulty, the standby board becomes active and ensures the proper

operation of the NodeB.

Error tolerance capability

When the software is faulty, it does not affect the entire NodeB because the system is capable

of self-healing. The software error tolerance of the NodeB covers the following aspects:

l Scheduled detection of key resources: The NodeB performs occupancy check on software

resources. If resource hang-up occurs due to software faults, the NodeB can release the

unavailable resources in time and export logs and alarms.

l Task monitoring: During the running of software, the NodeB monitors the internal errors

of all software and some hardware faults, if any. The NodeB also has a monitoring process

to monitor running status and report alarms when the system is faulty, and try to restorethe task by self-healing.

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l Data check: The NodeB performs scheduled or event-triggered data consistency check and

restores the data consistency preferably or preferentially. In addition, the NodeB generates

related logs and alarms.

l Watchdog: When a software error occurs, the NodeB detects the error through the software

watchdog and hardware watchdog and automatically resets.

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Technical Description 7 Reliability of the NodeB

nodeb technical description(v200_01)

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