DBS3900 Product Description(V100R001_01)

DBS3900

V100R001

Product Description

Issue 01

Date 2008-10-30

Part Number

Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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http://www.huawei.com

mailto:[email protected]

Contents

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

1 Overview of DBS3900 Products...............................................................................................1-1

2 Benefits of the DBS3900............................................................................................................2-1

3 System Architecture of the DBS3900......................................................................................3-13.1 BBU3900.........................................................................................................................................................3-2

3.1.1 Appearance of the BBU3900.................................................................................................................3-23.1.2 Functions of the BBU3900.....................................................................................................................3-33.1.3 Boards and Module of the BBU3900.....................................................................................................3-33.1.4 Logical Structure of the BBU3900.........................................................................................................3-53.1.5 Ports on the BBU3900............................................................................................................................3-7

3.2 RRU3908.........................................................................................................................................................3-93.2.1 Appearance of the RRU3908...............................................................................................................3-103.2.2 Functions of the RRU3908...................................................................................................................3-103.2.3 Logical Structure of the RRU3908.......................................................................................................3-103.2.4 Ports on the RRU3908..........................................................................................................................3-12

3.3 Auxiliary Devices of the DBS3900...............................................................................................................3-12

4 Application Scenarios of the DBS3900..................................................................................4-1

5 Features of the DBS3900...........................................................................................................5-1

6 Typical Configuration of the DBS3900..................................................................................6-1

7 Monitoring Principles of the DBS3900..................................................................................7-1

8 Network Topologies of the DBS3900.....................................................................................8-18.1 Network Topologies of the BBU3900............................................................................................................8-28.2 Network Topologies of the RRU3908............................................................................................................8-5

9 Operation and Maintenance of the DBS3900.......................................................................9-19.1 OM Modes of the DBS3900............................................................................................................................9-29.2 OM Functions of the DBS3900.......................................................................................................................9-3

10 Reliability of the DBS3900...................................................................................................10-1

11 Specifications of the DBS3900.............................................................................................11-1

DBS3900Product Description Contents

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12 Compliance Standards of the DBS3900.............................................................................12-1

ContentsDBS3900

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Figures

Figure 1-1 Basic modules and auxiliary devices..................................................................................................1-1Figure 1-2 Application of the distributed base station.........................................................................................1-2Figure 3-1 BBU3900 in GSM+UMTS dual mode...............................................................................................3-2Figure 3-2 Slots of the BBU3900.........................................................................................................................3-3Figure 3-3 Typical board configuration of the BBU3900 in GSM mode............................................................3-3Figure 3-4 Typical board configuration of the BBU3900 in GSM+UMTS dual mode.......................................3-4Figure 3-5 Typical board configuration of the BBU3900 in UMTS mode..........................................................3-4Figure 3-6 Logical structure of the BBU3900......................................................................................................3-6Figure 3-7 RRU3908..........................................................................................................................................3-10Figure 3-8 Logical structure of the RRU3908....................................................................................................3-11Figure 3-9 Structure of the APM30....................................................................................................................3-13Figure 3-10 Internal structure of the battery cabinet..........................................................................................3-14Figure 3-11 Internal structure of the transmission cabinet.................................................................................3-15Figure 4-1 Integrated application with BBU3900+RRU3908+APM30...............................................................4-2Figure 4-2 Embedded application with existing site equipment..........................................................................4-3Figure 7-1 Monitoring ports on the BBU3900 ....................................................................................................7-1Figure 7-2 Monitoring principles of the DBS3900..............................................................................................7-2Figure 8-1 Co-transmission mode........................................................................................................................8-2Figure 8-2 Non co-transmission mode.................................................................................................................8-2Figure 8-3 Typical network topology of the BBU3900.......................................................................................8-3Figure 8-4 Typical topologies between the BBU3900 and the RRU3908s.........................................................8-5Figure 9-1 OM system of the DBS3900...............................................................................................................9-2

DBS3900Product Description Figures


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Tables

Table 3-1 Ports on the BBU3900.........................................................................................................................3-7Table 3-2 Ports on the RRU3908.......................................................................................................................3-12Table 3-3 Functions of the transmission cabinet................................................................................................3-14Table 6-1 Typical configuration of the DBS3900................................................................................................6-1Table 8-1 Star topology........................................................................................................................................8-3Table 8-2 Chain topology.....................................................................................................................................8-4Table 8-3 Tree topology.......................................................................................................................................8-4Table 8-4 Ring topology.......................................................................................................................................8-4Table 11-1 Frequency bands supported by the DBS3900..................................................................................11-1Table 11-2 Output power of RRU3908..............................................................................................................11-1Table 11-3 Static receiver sensitivity of the DBS3900......................................................................................11-3Table 11-4 Dimensions.......................................................................................................................................11-3Table 11-5 Weight..............................................................................................................................................11-4Table 11-6 Power input of the BBU3900...........................................................................................................11-4Table 11-7 Power input of the RRU3908...........................................................................................................11-4Table 11-8 Power consumption of the DBS3900 in GSM mode.......................................................................11-5Table 11-9 Power consumption of the DBS3900 in UMTS mode.....................................................................11-5Table 11-10 Transmission ports on the BBU3900.............................................................................................11-5Table 11-11 Transmission ports on the RRU3908.............................................................................................11-6Table 11-12 Operating environment of the BBU3900.......................................................................................11-7Table 11-13 Operating environment of the RRU3908.......................................................................................11-7

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About This Document

PurposeThis document describes the software and hardware structure, subsystems, configuration types,and topology of the DBS3900. This document also lists the technical specifications for theDBS3900 such as the RF specifications, engineering specifications, and physical interfacespecifications.

Product VersionThe following table lists the product versions related to this document.

Product Name Product Version

DBS3900 V100R001

Intended AudienceThis document is intended for:

l Network planners

l Field engineers

l System engineers

Change HistoryFor changes in the document, refer to Changes in the DBS3900 Product Description.

Organization

1 Overview of DBS3900 Products

The DBS3900 consists of two basic modules: BBU3900 (baseband processing unit) andRRU3908 (outdoor remote radio unit). Flexible combinations of the two basic modules andauxiliary devices can provide comprehensive solutions that apply to different scenarios ofoperators. For the distributed installation scenario, the RRU3908 can be installed close to theantenna to decrease feeder loss and enhance base station performance.

2 Benefits of the DBS3900

DBS3900Product Description About This Document


1

The DBS3900 features a multi-mode modular design and has benefits such as smooth solution,fast network deployment, low cost, high reliability, and energy-saving and environmentallyfriendly design.

3 System Architecture of the DBS3900

The DBS3900 has a modular structure and provides comprehensive site solutions throughflexible combination of the basic modules and auxiliary devices.

4 Application Scenarios of the DBS3900

This describes two typical application scenarios of the DBS3900: integrated application andembedded application.

5 Features of the DBS3900

The DBS3900 has features such as the advanced platform-based architecture, large capacity,environmentally friendly design, and low cost.

6 Typical Configuration of the DBS3900

For the DBS3900 in typical configuration, a sector must be supported by at least one RF modulewhich supports a maximum of six carriers.

7 Monitoring Principles of the DBS3900

The monitoring system of the DBS3900 monitors the power supply, fans, and environment.

8 Network Topologies of the DBS3900

The DBS3900 supports multiple network topologies, such as star, tree, and chain topologies,and supports a maximum of five levels of topologies.

9 Operation and Maintenance of the DBS3900

Operation and maintenance of the DBS3900 performs management, monitoring, andmaintenance of the software, hardware, and configuration of the DBS3900. In addition, itprovides various OM modes and multiple maintenance platforms to meet different maintenancerequirements.

10 Reliability of the DBS3900

The DBS3900 provides a complete redundancy design, which improves the integration ofmodules, reduces the quantity of the components, and greatly enhances the system reliability.

11 Specifications of the DBS3900

The technical specifications of the DBS3900 cover items such as the frequency band, outputpower, and engineering.

12 Compliance Standards of the DBS3900

The DBS3900 complies with the standards of EMC, acoustic noise, working environment,transportation, storage, and anti-seismic performance.

Conventions1. Symbol Conventions

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

About This DocumentDBS3900

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2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

Issue 01 (2008-10-30)

Symbol Description

DANGERIndicates a hazard with a high level of risk that, if not avoided,will result in death or serious injury.

WARNINGIndicates a hazard with a medium or low level of risk which, ifnot avoided, could result in minor or moderate injury.

CAUTIONIndicates a potentially hazardous situation that, if not avoided,could cause equipment damage, data loss, and performancedegradation, or unexpected results.

TIP Indicates a tip that may help you solve a problem or save yourtime.

NOTE Provides additional information to emphasize or supplementimportant points of the main text.

2. General Conventions

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files,directories,folders,and users are in boldface. Forexample,log in as user root .

Italic Book titles are in italics.

Courier New Terminal display is in Courier New.

3. Command Conventions


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italic.

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

{x | y | ...} Alternative items are grouped in braces and separated by verticalbars.One is selected.

[ x | y | ... ] Optional alternative items are grouped in square brackets andseparated by vertical bars.One or none is selected.

{ x | y | ... } * Alternative items are grouped in braces and separated by verticalbars.A minimum of one or a maximum of all can be selected.

DBS3900Product Description About This Document


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[ x | y | ... ] * Alternative items are grouped in braces and separated by verticalbars.A minimum of zero or a maximum of all can be selected.

4. GUI Conventions


Boldface Buttons,menus,parameters,tabs,window,and dialog titles are inboldface. For example,click OK.

> Multi-level menus are in boldface and separated by the ">" signs.For example,choose File > Create > Folder .

5. Keyboard Operation


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

Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+Ameans the three keys should be pressed concurrently.

Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the twokeys should be pressed in turn.

6. Mouse Operation

Action Description

Click Select and release the primary mouse button without moving thepointer.

Double-click Press the primary mouse button twice continuously and quicklywithout moving the pointer.

Drag Press and hold the primary mouse button and move the pointerto a certain position.

About This DocumentDBS3900

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Issue 01 (2008-10-30)

1 Overview of DBS3900 Products

The DBS3900 consists of two basic modules: BBU3900 (baseband processing unit) andRRU3908 (outdoor remote radio unit). Flexible combinations of the two basic modules andauxiliary devices can provide comprehensive solutions that apply to different scenarios ofoperators. For the distributed installation scenario, the RRU3908 can be installed close to theantenna to decrease feeder loss and enhance base station performance.

Figure 1-1 shows the basic modules and auxiliary devices of the DBS3900.

Figure 1-1 Basic modules and auxiliary devices

Figure 1-2 shows the application of the distributed base station.

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Figure 1-2 Application of the distributed base station

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2 Benefits of the DBS3900

The DBS3900 features a multi-mode modular design and has benefits such as smooth solution,fast network deployment, low cost, high reliability, and energy-saving and environmentallyfriendly design.

Smooth EvolutionBased on the unified hardware platform, the DBS3900 supports three working modes: GSMmode, GSM+UMTS dual mode, and UMTS mode through configuration of different software.In addition, the DBS3900 supports smooth evolution to the Long-Term Evolution (LTE).

The DBS3900 provides the following evolution solutions:l Evolution from the GSM mode to the GSM+UMTS dual mode and then to the UMTS mode.

l When working in GSM mode, the DBS3900, in terms of hardware, supports evolution tothe GSM EDGE Radio Access Network (GERAN) without requirements for new hardware.

l When working in UMTS mode, the DBS3900, in terms of hardware, supports HSPA+(MIMO, 64QAM) without requirements for new hardware.

l Evolution from the GSM mode to the LTE without requirements for RRU hardwarechanges.

l Evolution from the UMTS mode to the LTE without requirements for RRU hardwarechanges.

Energy-Saving and Environmentally Friendly Designl The DBS3900 can control power-on/off of boards through software, disabling of RF

channels through software, and voltage adjustment of the Power Amplifier (PA) powersupply. This allows adjustment of power requirements based on actual traffic load, thusreducing power consumption.

l The RRU3908 does not have fans and works in mute mode. Thus, there is no acoustic noise.

l The fan of BBU3900 features the intelligent temperature control design, which enablesautomatic temperature adjustment and fan speed control, thus further limiting powerconsumption.

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Fast Network Deployment

l Featuring compact design and distributed installation, the DBS3900 frees operators fromoverconcern about load bearing and lease of extra installation space.

l The distributed installation of the DBS3900 facilitates transportation, configuration, andinstallation, and reduces difficulties for operators in site acquisition, equipment roomconstruction, equipment transportation and installation. The rollout cost is cut downbecause special handling equipment such as the crane is not required.

l The RRU3908 can support dual-mode application of any two modes (GSM/UMTS/LTE)through software configuration. One BBU3900 can support dual-mode application of anytwo modes through insertion of boards in different modes. Thus, the investment in therunning network can be utilized optimally and repeat network construction can be avoided.

Low Cost

l When the DBS3900 works in GSM+UMTS dual mode,– The Abis interface of the GSM network and the Iub interface of the UMTS network

share the transmission port, saving transmission cost.– The CPRI bandwidth is shared, saving investment and cost in construction.

l When the GSM network uses E1/T1 transport and UMTS uses IP transport, the clock ofthe UMTS can be directly extracted from the GSM, thus implementing clock resourcesharing without additional investment in the Global Positioning System (GPS) or clockserver.

l The BBU3900 can be installed on a wall or in a confined space. In addition, the existingsite and equipment, such as the outdoor equipment, transmission device, and power system,can be utilized optimally to reduce operators' investment.

l The RRU3908 can be installed close to the antenna, thus decreasing power consumption,saving feeder cost, extending coverage area, and reducing the number of sites.

l The networks in different modes share the transmission, network management, andauxiliary devices, lowering the total investment, particularly the cost in maintenance.

l The clock over IP is supported and GPS is not required in IP transport, saving investment.

l The dynamic transmission bandwidth sharing is supported in GSM+UMTS dual-mode IPnetworking.

l The cables facilitate installation, maintenance, and capacity expansion, reducing therequirements for OM manpower.

l The RF module supports the dual-mode application of GSM/UMTS/LTE and the externalcombiner such as the SASU is not required. That is, signals of different modes can betransmitted at one Transmit (TX) port of the RF module at the same time. This can lowerthe construction cost without extra combination loss. Therefore, the RRU is ideal for actingas the signal source of indoor coverage.

High Reliability

l Sharing the unified platform and hardware with the Huawei fourth-generation base stations,the DBS3900 runs stably and maturely.

l For the BBU, the GSM main control board is independent of the UMTS main control board.That is, the fault of a main control board in one mode does not impact services in anothermode.

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l When the DBS3900 works in UMTS mode,– Each RRU3908 provides two CPRI interfaces that can be used to form a ring topology

between the RRUs and the BBU3900. In this way, a backup channel between theBBU3908 and the RRU3908s is guaranteed to improve network reliability.

– The main control board supports the 1+1 backup mode.

– The baseband board supports the resource pool design. The boards in the same resourcepool support the N+1 backup mode.

l The BBU3900 supports the power input in 1+1 backup mode.

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3 System Architecture of the DBS3900

About This Chapter

The DBS3900 has a modular structure and provides comprehensive site solutions throughflexible combination of the basic modules and auxiliary devices.

3.1 BBU3900The BBU3900 is a baseband processing unit. It provides physical ports for connection to theBSC/RNC and the RRU3908, performs centralized management of the entire DBS3900 systemin terms of Operation and Maintenance (OM) and signaling processing, and provides the systemclock.

3.2 RRU3908The RRU3908 is an outdoor remote radio unit. It processes baseband signals and RF signals.

3.3 Auxiliary Devices of the DBS3900The auxiliary devices of the DBS3900 are the APM30, battery cabinet, and transmission cabinet.

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3.1 BBU3900The BBU3900 is a baseband processing unit. It provides physical ports for connection to theBSC/RNC and the RRU3908, performs centralized management of the entire DBS3900 systemin terms of Operation and Maintenance (OM) and signaling processing, and provides the systemclock.

3.1.1 Appearance of the BBU3900The BBU3900 has a case structure. It can be installed in a 19-inch-wide and 2 U-high indoorspace or outdoor protective cabinet.

3.1.2 Functions of the BBU3900The BBU3900 is a baseband processing unit, which the interface unit connecting the DBS3900and the BSC/RNC.

3.1.3 Boards and Module of the BBU3900The BBU3900 can be configured with the boards such as the GSM Timing and Main controlUnit (GTMU), WCDMA Main Processing Transmission unit (WMPT), WCDMA BasebandProcessing unit (WBBP), Universal Transmission Processing unit (UTRP), Universal Powerand Environment Interface Unit (UPEU), Universal Environment Interface Unit (UEIU),Universal E1/T1 Lightning Protection (UELP), Universal FE Lightning Protection (UFLP), andUBFA.

3.1.4 Logical Structure of the BBU3900This describes the logical structure of the BBU3900. The BBU3900, which features a modulardesign, consists of the transport subsystem, baseband subsystem, control subsystem, and powermodule.

3.1.5 Ports on the BBU3900

3.1.1 Appearance of the BBU3900The BBU3900 has a case structure. It can be installed in a 19-inch-wide and 2 U-high indoorspace or outdoor protective cabinet.

The dimensions of the BBU3900 in GSM+UMTS dual mode are 442 mm (width) x 310 mm(depth) x 86 mm (height). Figure 3-1 shows the BBU3900.

Figure 3-1 BBU3900 in GSM+UMTS dual mode

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3.1.2 Functions of the BBU3900The BBU3900 is a baseband processing unit, which the interface unit connecting the DBS3900and the BSC/RNC.

The BBU3900 has the following functions:

l Provides ports between the BBU3900 and the BSC/RNC for data communication.

l Provides the CPRI ports for communication with the RRU.

l Provides USB ports, one of which facilitates automatic NodeB upgrade when a USB diskis inserted during software installation and data configuration

l Provides the OM channel for connection to the LMT (or M2000).

l Processes uplink and downlink data.

l Manages the entire DBS3900 in terms of OM and signaling processing.

l Provides the system clock.

3.1.3 Boards and Module of the BBU3900The BBU3900 can be configured with the boards such as the GSM Timing and Main controlUnit (GTMU), WCDMA Main Processing Transmission unit (WMPT), WCDMA BasebandProcessing unit (WBBP), Universal Transmission Processing unit (UTRP), Universal Powerand Environment Interface Unit (UPEU), Universal Environment Interface Unit (UEIU),Universal E1/T1 Lightning Protection (UELP), Universal FE Lightning Protection (UFLP), andUBFA.

Figure 3-2 shows the slots of the BBU3900.

Figure 3-2 Slots of the BBU3900

Figure 3-3, Figure 3-4, and Figure 3-5 show the typical board configurations of the BBU3900working in GSM mode, GSM+UMTS dual mode, and UMTS mode respectively.

Figure 3-3 Typical board configuration of the BBU3900 in GSM mode



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Figure 3-4 Typical board configuration of the BBU3900 in GSM+UMTS dual mode

Figure 3-5 Typical board configuration of the BBU3900 in UMTS mode

GTMU

The GTMU is the main control and transmission board of the BBU3900 working in GSM mode.It has the following functions:

l Provides the six-channel CPRI ports for connection to the RF modules and supportsconvergence of dual-mode signals in dual-mode application.

l Processes clock signals and provides a unified clock for service boards in GSM mode.

l Provides OM management for the GSM network.

l Provides four E1s/T1s, one FE electrical port, and one FE optical port.

WMPT

The WMPT is the main control and transmission board of the BBU3900 working in UMTSmode. It has the following functions:

l Processes clock signals and provides a unified clock and reference clock source for serviceboards in UMTS mode.

l Provides OM management for the UMTS network.

l Provides four E1s/T1s, one FE electrical port, and one FE optical port.

l Provides one USB port to download and activate the host software by using a USB disk.

l Processes signaling and manages resources.

WBBP

The WBBP is the baseband processing unit in UMTS mode, and it has the following functions:

l Processes uplink and downlink baseband signals.


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l Supports the High Speed Downlink Packet Access (HSDPA) and High Speed UplinkPacket Access (HSUPA).

l Supports CPRI ports in 1+1 backup mode.

UTRP

The UTRP supports two types of interfaces:

l Universal ATM over E1/T1 interface

l Universal IP packet over E1/T1 interface

UPEU

The UPEU is the power module of the BBU3900. A maximum of two UPEUs can be configuredfor the BBU. The UPEU supports the 1+1 backup mode and has the following functions:

l Converts –48 V DC or +24 V DC power into the working power.

l Provides two RS485 monitoring signals.

l Provides eight dry contact alarm inputs.

UEIU

The UEIU transmits monitoring signals and alarm signals for the BBU3900. The UEIU has thefollowing functions:

l Provides two ports with each transmitting one RS485 signal.

l Provides two ports with each transmitting four dry contact signals.

UELP

The UELP provides surge protection for E1s/T1s.

UFLP

The UFLP provides surge protection for FEs.

UBFA

The UBFA is the FAN unit of the BBU3900. It provides the BBU3900 with functions such asventilation and heat dissipation, linear adjustment of the fan speed, and detection of fan faults.

3.1.4 Logical Structure of the BBU3900This describes the logical structure of the BBU3900. The BBU3900, which features a modulardesign, consists of the transport subsystem, baseband subsystem, control subsystem, and powermodule.

Figure 3-6 shows the logical structure of the BBU3900.



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Figure 3-6 Logical structure of the BBU3900

Transport Subsystem

The transport subsystem provides physical ports between the BBU3900 and the BSC/RNC forinformation exchange.

In addition to providing the transmission channel for data flow exchange with the BSC/RNC,the transport subsystem provides an OM channel for connection to the OMC (LMT or M2000)to operate and maintain the BBU.

Baseband Subsystem

The baseband subsystem processes both UL and DL baseband signals. The functions of thesubsystem are performed by the following modules:

l UL baseband signal processing module, which consists of the demodulation unit and thedecoding unit. In this module, uplink baseband signals are processed into despreading softdecision symbols after access channel searching, access channel demodulation, and


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dedicated channel demodulation. The signals are then sent to the RNC through the transportsubsystem after decoding and Frame Protocol (FP) processing.

l DL baseband signal processing module, which consists of the modulation unit and thecoding unit. The module sends the UMTS signals received from the transport subsystemto the FP processor for FP processing. After coding the signals, the module processes thesignals through transmission channel mapping, physical channel generating, framing,spreading, modulation, transmit diversity control, and power control combination. Themodule finally sends the processed signals to the interface module.

Control SubsystemThe control subsystem performs centralized management of the entire distributed base stationsystem in terms of OM and signaling processing. It also provides the system clock.

l The OM functions involve equipment management, configuration management, alarmmanagement, software management, and commissioning management.

l The signaling processor has functions such as NBAP signaling processing, ALCAPprocessing, SCTP processing, and logical resource management.

l The clock module has functions such as, providing a phase-locked clock, GPS clock, free-run clock, or external clock such as the BITS, generating a synchronization clock for theentire DBS3900, and providing a system clock required by the DBS3900.

Power ModuleThe power module converts -48 V DC or +24 V DC power into the working power for the boards.The monitoring unit collects various types of Boolean alarm information, and reports the alarminformation to the control subsystem.

When the BBU3900 works in GSM+UMTS dual mode, the signals travel to the GTMU throughthe Abis or Iub interface. Then, the GSM signals are processed at the GTMU and the UMTSsignals are sent to the WMPT from the GTMU through the backplane. After processed at theWBBP, the GU signals are converged to the GTMU and sent to the RRU through the CPRIinterface.

3.1.5 Ports on the BBU3900

Table 3-1 describes the ports on the boards of the BBU3900.

Table 3-1 Ports on the BBU3900

Board Port Quantity Connector Description

UPEU -48 V DC powerinput port

1 7W2 The +24 V DCUPEU isoptional.



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Monitoring port 2 RJ45 Providing twoRS485monitoringsignals;connecting toexternalmonitoringdevices

Alarm port 2 RJ45 Providing eightdry contactalarm inputs;connecting tothe externalalarm device

WMPT E1/T1 port 1 DB26 One portsupporting fourE1s/T1s

USB loadingport

1 USB USB2.0

TST port 1 USB Port for testingthe USB clock

FE0 port 1 RJ45 FE electricalport

FE1 port 1 SFP FE optical port

ETH port 1 RJ45 For localmaintenanceandcommissioning

GPS clock inputport

1 SMA -

WBBP CPRI port 3 SFP -

GTMU CPRI port 6 SFP -

E1/T1 port 1 DB26 One portsupporting fourE1s/T1s

USB loadingport

1 USB USB2.0

TST port 1 USB Port for testingthe USB clock

FE0 port 1 RJ45 FE electricalport


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FE1 port 1 SFP FE optical port

ETH port 1 RJ45 For localmaintenanceandcommissioning

UTRP E1/T1 port 2 DB26 Supportingeight E1s/T1s

UELP INSIDE port 1 DB25 Input of fourE1s/T1s

OUTSIDE port 1 DB26 Output of fourE1s/T1s

UFLP FE0 and FE1ports (INSIDE)

2 RJ45 Connecting tothe FE0 and FE1ports on theWMPT

FE0 and FE1ports(OUTSIDE)

2 RJ45 Connecting toFE ports on thepeer equipment

UEIU MON0 port 1 RJ45 -

MON1 port 1 RJ45 -

EXT-ALM0port

1 RJ45 -

EXT-ALM1port

1 RJ45 -

3.2 RRU3908The RRU3908 is an outdoor remote radio unit. It processes baseband signals and RF signals.

3.2.1 Appearance of the RRU3908

3.2.2 Functions of the RRU3908The RRU3908 is an outdoor remote radio unit. It transmits and processes baseband signalsbetween the RRU3908 and the BBU3900 and RF signals between the RRU3908 and the antennasystem.

3.2.3 Logical Structure of the RRU3908This describes the logical structure of the RRU3908. The RRU3908, which features a modulardesign, consists of the high-speed interface unit, TRX, Power Amplifier (PA), duplexer, andLow Noise Amplifier (LNA).

3.2.4 Ports on the RRU3908



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The ports on the RRU3908 are the RF ports, power supply ports, transmission ports, alarm port,and AISG (V2.0) port.

3.2.1 Appearance of the RRU3908

The RRU3908 is an outdoor remote radio unit. Figure 3-7 shows an RRU3908.

Figure 3-7 RRU3908

3.2.2 Functions of the RRU3908The RRU3908 is an outdoor remote radio unit. It transmits and processes baseband signalsbetween the RRU3908 and the BBU3900 and RF signals between the RRU3908 and the antennasystem.

l Receives the downlink baseband data from the BBU3900 and transmits the uplink basebanddata to the BBU3900.

l Provides the RX and TX channels for RF signals.

l Amplifies low-power RF signals from the TRX.

l Multiplexes RX and TX signals over RF channels, which enables the RX signals and TXsignals to share the same antenna path.

l Filters RX signals and TX signals.

l Amplifies the signals received from antennas.

3.2.3 Logical Structure of the RRU3908This describes the logical structure of the RRU3908. The RRU3908, which features a modulardesign, consists of the high-speed interface unit, TRX, Power Amplifier (PA), duplexer, andLow Noise Amplifier (LNA).

Figure 3-8 shows the logical structure of the RRU3908.


Product Description


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Figure 3-8 Logical structure of the RRU3908

High-Speed Interface UnitThe high-speed interface unit performs the following functions:l Receives the downlink baseband data from the BBU3900.

l Transmits the uplink baseband data to the BBU3900.

l Transfers data from the cascaded RRUs.

TRXThe TRX has two RX channels and two TX channels for RF signals.l The RX channels have the following functions:

– Down-converts the received signals into Intermediate Frequency (IF) signals.

– Amplifies the IF signals.

– Performs analog-to-digital conversion.

– Performs digital down-conversion.

– Performs matched filtering.

– Performs Digital Automatic Gain Control (DAGC).

l The TX channels have the following functions:– Shapes and filters downlink spread-spectrum signals.

– Performs digital-to-analog conversion.

– Up-converts IF signals to the TX band.

PAThe PA adopts the advanced DPD and A-Doherty technologies to amplify low-power RF signalsfrom the TRX.



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Duplexer

The functions of the duplexer are as follows:l Multiplexes RX signals and TX signals so that they can share the same antenna channel.

l Filters RX signals and TX signals.

LNA

The LNA amplifies the signals received from antennas.

3.2.4 Ports on the RRU3908The ports on the RRU3908 are the RF ports, power supply ports, transmission ports, alarm port,and AISG (V2.0) port.

The RRU3908 features a modular structure with its ports located at the module bottom and inthe cabling cavity. Table 3-2 describes the ports on the RRU3908.

Table 3-2 Ports on the RRU3908

Port Type Connector Quantity

Remarks

-48 V DC power supply port OT terminal 2 Power supplyport

CPRI port SFP 2 Transmissionports

Port for two dry contact alarmsand one RS485 signal

DB15 1 Alarm port

Main TX/RX port DIN, round, andwaterproof

1 RF ports

Diversity TX/RX port DIN, round, andwaterproof

1

RRU inter-connection port 2W2 1

RET antenna port DB9 1 AISG (V2.0)port

3.3 Auxiliary Devices of the DBS3900The auxiliary devices of the DBS3900 are the APM30, battery cabinet, and transmission cabinet.

APM30

The APM30 has the following features:l Small size and light weight


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l Installation space for user devices

l DC power supply

l Battery management, and monitoring and communication of the power supply system

l Power distribution, surge protection, temperature control, and power backup

l Installation on a pole or on the ground

The APM30 has the following components:l Power Supply Unit (PSU)

l Power Distribution Unit (PDU)

l APM Power Monitor unit Interface Board (APMI)

l Temperature control unit

Figure 3-9 shows the structure of the APM30.

Figure 3-9 Structure of the APM30

Battery CabinetFigure 3-10 shows the internal structure of the battery cabinet.



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Figure 3-10 Internal structure of the battery cabinet

1. Protecting hood for the copper busbar 2. Cable hole for the AC powercable

3. Cable hole for the signal cable

4. Cable hole for the DC power cable 5. Guide rail

Transmission CabinetTable 3-3 describes the functions of the transmission cabinet.

Table 3-3 Functions of the transmission cabinet

Function Description

-48 V DCpower supply

The -48 V DC-BOX in the APM30 has the following functions:l Supports the -48 V DC power input.

l Surge protection.

l Provides nine -48 V DC outputs from LOAD0 to LOAD8. And one ofthe outputs is 12A, providing the power for the fan.

Installationspace for userdevices

l Provides the standard 19-inch-wide and 11 U-high installation space

l If an AC heater needs to be installed in the 1 U space at the bottom ofthe cabinet, the APM30 transmission cabinet provides 10 U space forinstalling the user equipment.


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Function Description

Alarm function Provides three dry contact alarm ports for remote and attendance-freemonitoring:l Dry contact port 1: connects to the door status sensor. An open circuit

means that the connection is faulty while a closed circuit means that theconnection is normal.

l Dry contact port 2: connects to the DC-BOX surge protector. An opencircuit means that the connection is faulty while a closed circuit meansthat the connection is normal.

l Dry contact port 3: connects to the extended monitoring board. An opencircuit means that the connection is faulty while a closed circuit meansthat the connection is normal. The faults include fan failure, temperaturesensor failure, internal overtemperature or undertemperature.

Figure 3-11 shows the internal structure of the transmission cabinet.

Figure 3-11 Internal structure of the transmission cabinet

1. Filler panel 2. DCDU-03 3. APMI board

4. Fan 5. AFMU (APM Fan Monitor unit Interface Board) board



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4 Application Scenarios of the DBS3900

This describes two typical application scenarios of the DBS3900: integrated application andembedded application.

Integrated Application with BBU3900+RRU3908+APM30For a new site,l If the site supplies the AC power and the APM30 does not have enough space for the

transmission equipment, use the installation mode of BBU3900+RRU3908+APM30+transmission cabinet.

l If the APM30 requires backup power but does not have enough space, use the installationmode of BBU3900+RRU3908+APM30+battery cabinet.

l If the site requires backup power and enough space for the transmission equipment, use theinstallation mode of BBU3900+RRU3908+APM30+battery cabinet+transmission cabinet.

Figure 4-1 shows the typical application scenario of BBU3900+RRU3908+APM30.

DBS3900Product Description 4 Application Scenarios of the DBS3900


4-1

Figure 4-1 Integrated application with BBU3900+RRU3908+APM30

The features of this scenario are as follows:

l The BBU3900 and transmission equipment are installed in the APM30, and the RRU3908is installed on a metal pole close to the antenna.

l The APM30 provides installation space and outdoor protection for the BBU3900, supplies-48 V DC power to the BBU3900 and RRU3908, and provides management, monitoring,and surge protection for batteries.

l The APM30 can hold the 24 Ah batteries.

Embedded Application with Existing Site EquipmentFor a site which is shared with the 2G network, the BBU3900 can be installed in any standard19-inch-wide and 2 U-high cabinet, and the RRU3908 can be installed on a metal pole close tothe antenna. Additionally, the BBU3900 and the RRU3908 can share the power backup systemand transmission system of the existing network. In this way, a new network can be deployedon the running network at a very low cost. Figure 4-2 shows the embedded application.

4 Application Scenarios of the DBS3900DBS3900

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Issue 01 (2008-10-30)

Figure 4-2 Embedded application with existing site equipment

DBS3900Product Description 4 Application Scenarios of the DBS3900


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5 Features of the DBS3900

The DBS3900 has features such as the advanced platform-based architecture, large capacity,environmentally friendly design, and low cost.

Advanced Platform-Based Architecture Sharing the unified platform and hardware with the Huawei fourth-generation base stations,

the DBS3900 runs stably and maturely.

The DBS3900 supports GSM+UMTS dual-mode application, HSPA+, and smoothevolution to the LTE.

The BBU3900 provides eight slots, in which the boards or modules are swappable, andsupports smooth capacity expansion and evolution.

The RF module integrates the duplexer and the Transceiver Unit (TRU), thus enhancingintegrity of RF parts and meeting future requirements for a compact, high-efficiency, andlow-cost base station.

High Capacity When the DBS3900 works in GSM mode, a BBU3900 supports the maximum cell

configuration of S24/24/24, and an RRU3908 supports a maximum of six GSM carriers.

When the DBS3900 works in GSM+UMTS dual mode, a BBU3900 supports the maximumcell configuration of GSM S24/24/24 or UMTS S8/8/8, Capacity of the RRU3908 can beexpanded through cascading of RRU3908s, and three cascaded RRU3908s can supportthe cell configuration of GSM S4/4/4 + UMTS S2/2/2 or GSM S5/5/5 + UMTS S1/1/1.

When the DBS3900 works in UMTS mode, a BBU3900 supports 24 cells, 1,536 CEs inthe uplink, 1,536 CEs in the downlink, and the maximum configuration of 3 x 8. In addition,the BBU3900 supports the HSDPA and HSUPA. An RRU3908 supports a maximum offour UMTS carriers.

Low Power Consumption

The DBS3900 can control the power-on/off of boards through software, disabling of RF channelsthrough software, voltage adjustment of PA power supply, and the rotation speed of the fan.This enable adjustment of power requirements based on the actual traffic load, thus reducingpower consumption.

DBS3900Product Description 5 Features of the DBS3900


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Transmission Sharingl Sharing the CPRI port

The CPRI data of the GSM and UMTS networks can be multiplexed on the same opticalcable, which reduces the quantity of CPRI ports.

l Sharing transmission resources between the Abis and the Iub interfaces

The Abis interface of the GSM network and the Iub interface of the UMTS network supportsharing transmission resources and saving transmission cost.

l RRU3908 supporting power sharing among carriers of the same mode

An RRU3908 has large power output which can reach 80 W and supports power sharingamong carriers of the same mode on the same TX channel, which raises power utilization.

Coveragel The transmission distance of a single-mode optical cable at one level (that is, from the BBU

to an RRU or from one RRU to another RRU) is 40 km. The RRU supports a maximum ofthree levels of cascading, which enables the longest distance between RRUs and a BBU tobe 100 km.

l When the DBS3900 works in UMTS mode, one RRU3908 can support open loops in bothSpace Time Transmit Diversity (STTD) and Time Switched Transmit Diversity (TSTD)modes and closed loops in TX diversity mode, which enhances the performance in DLcoverage and capacity.

l The DBS3900 supports the 2-way RX diversity and 4-way RX diversity, which enhancesthe performance in UL demodulation and receiver sensitivity.

Networking Capabilityl The DBS3900 supports multiple transmission modes, such as E1/T1, FE electrical,

microwave, SDH, and satellite transmission.l The DBS3900 supports multiple network topologies, such as star, tree, chain, and ring

topologies.l The DBS3900 supports Flex Abis networking.

l The DBS3900 supports co-transmission between the GSM and the UMTS.

l Native IP transport is supported without additional hardware. Compared with the PWE3technology, native IP transport enjoys higher transmission efficiency and lower investmentbecause the PWE3 external device is not required.

l When working in UMTS mode, the DBS3900 supports ATM and IP dual stack to protectoperators' early investment in ATM transport.

l The DBS3900 supports optimized transmission on the Abis interface. Detection andrestoration of idle frames are supported on the BTS and BSC sides, and thus idle framesare not transmitted over transport lines. This helps save the transmission bandwidth.

l The DBS3900 supports compression and multiplexing technologies such as the PPP headercompression, PPP MUX, IP Header Compression (IPHC), achieving high transmissionbandwidth efficiency over the E1 port.

Flexible Clock Synchronization ModesThe DBS3900 supports the following clock synchronization modes to fulfill different clocknetworking requirements:

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l (Default) Synchronization with the upper-level clock extracted from the Abis or Iubinterface.

l Synchronization with the clock obtained from the Global Positioning System (GPS) .

l Synchronization with an external clock such as a 2 MHz Building Integrated Timing SupplySystem (BITS) clock.

l Synchronization with the IP clock, a highly cost-effective clock solution, which can beobtained through software upgrade without additional hardware.

l Clock phase lock, tracing, and memory functions and free-run synchronization mode. Whenthe clock operates in free-run mode, the system can keep operational for at least 90 days atnormal temperature.

Enhanced Antenna Technologyl The RET antenna is supported to optimize network coverage, reduce interference, and

expand system capacity.l The remote batch operation and maintenance, batch software upgrade, and batch adjustment

of RET antenna downtilts are supported.l The automatic scanning of the RET antenna is supported.

l The Antenna Interface Standard Group (AISG) V1.1 and V2.0 standard interfaces aresupported.

l The cascading of RET antennas is supported.

Operation and Maintenance

The DBS3900 supports four types of OM platforms: BTS SMT, BSC LMT, NodeB LMT, andM2000.

l The DBS3900 supports local maintenance, remote maintenance, and reverse maintenance.

l The DBS3900 supports maintenance based on the Man Machine Language (MML).

l The Bootstrap Protocol (BOOTP) and the Dynamic Host Configuration Protocol (DHCP)are supported when the DBS3900 works in UMTS mode. When data configuration is notperformed or an exception occurs, the DBS3900 automatically sets up an OM channel toimprove system reliability and to perform remote troubleshooting.

l The RRU topology scanning function is provided to enable automatic monitoring of theRRU3908 topology in real time and to help reduce manual intervention.

l The complete system self-check function is provided, and thus commissioning does nothave to be performed locally.

Environment Adaptabilityl BBU3900

– The BBU3900 has a built-in surge protection module that provides proper protection.

– The BBU has a case structure and complies with the International Protection (IP) 25standard in terms of waterproofing and dustproofing.

– The BBU3900 has wide working temperature range, from -20°C to +55°C.

– The BBU3900 has wide voltage range that allows working voltage at– -38.4 V DC to -57 V DC in the case of -48 V DC power input

DBS3900Product Description 5 Features of the DBS3900


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– +21.6 V DC to +29 V DC in the case of +24 V DC power input

– The power module enables the indoor 220 V AC power to be converted into -48 V DCpower for the BBU.

l RRU3908– The RRU3908 has a compact and totally-enclosed design and complies with the

International Protection (IP) 65 standard in terms of waterproofing and dustproofing.The design satisfies class 1 standard in terms of protection against damp, mould, andsalt mist. The sun shields protect RRUs from solar radiation and adverse environments.

– The RRU3908 has wide working temperature range:– From -40°C to +50°C without solar radiation

– From -40°C to +45°C with the solar radiation of 1,120 W/m2

– The RRU3908 has wide voltage range which allows working voltage at -36 V DC to-57 V DC in the case of –48 V DC power input.

– The power module enables the indoor 220 V AC power to be converted into -48 V DCpower for the RRU3908.

HSDPAl The HSUPA and R99/R4 services can be supported by the same carrier.

l The downlink data rate for a single UE peaks at 14.4 Mbit/s.

l A single cell supports 15 High Speed Physical Downlink Shared Channel (HS-PDSCH)codes and dynamic code resource allocation.

l 12 categories of UE at various rates are supported.

l A single cell supports 64 HSDPA UEs.

l The dynamic power allocation is supported.

l The QPSK and 16QAM modulation modes are supported to raise spectrum efficiency.

HSUPAl The HSUPA and R99/R4 services can be supported by the same carrier.

l The E-DCH TTIs of 10 ms and 2 ms are supported.

l The uplink data rate for a single UE peaks at 5.76 Mbit/s.

l A single cell supports a maximum of 60 HSUPA UEs.

l The fast measurement of Received Total Wideband Power (RTWP) in 2 ms is supportedto effectively improve the reliability of UL loads.

Access of High-Velocity UEsThe DBS3900 allows users to enjoy services in the vehicles such as express trains or maglevtrains at a speed of up to 400 km/h.

5 Features of the DBS3900DBS3900

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6 Typical Configuration of the DBS3900

For the DBS3900 in typical configuration, a sector must be supported by at least one RF modulewhich supports a maximum of six carriers.

Table 6-1 shows the typical configurations of the DBS3900.

Table 6-1 Typical configuration of the DBS3900

Typical Configuration Numberof BBUs

Number of RRUs (NoTransmit Diversity)

S 1/1/1 GSM S1/1/1 1 3

UMTS S1/1/1

S 2/2/2 GSM S1/1/1 + UMTS S1/1/1 1 3

GSM S2/2/2

UMTS S2/2/2

S 3/3/3 GSM S1/1/1 + UMTS S2/2/2 1 3

GSM S2/2/2 + UMTS S1/1/1

GSM S3/3/3

UMTS S3/3/3

S 4/4/4 GSM S2/2/2 + UMTS S2/2/2 1 3

GSM S3/3/3 + UMTS S1/1/1

GSM S4/4/4

UMTS S4/4/4

S 5/5/5 GSM S3/3/3 + UMTS S2/2/2 1 3

GSM S4/4/4 + UMTS S1/1/1

GSM S5/5/5

DBS3900Product Description 6 Typical Configuration of the DBS3900


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Typical Configuration Numberof BBUs

Number of RRUs (NoTransmit Diversity)

S 6/6/6 GSM S4/4/4 + UMTS S2/2/2 1 3

GSM S5/5/5 + UMTS S1/1/1

GSM S6/6/6

6 Typical Configuration of the DBS3900DBS3900

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7 Monitoring Principles of the DBS3900

The monitoring system of the DBS3900 monitors the power supply, fans, and environment.

Monitoring Ports on the BBU3900Figure 7-1 shows the monitoring ports of the BBU3900.

Figure 7-1 Monitoring ports on the BBU3900

l The BBU3900 can provide 2 RS485 buses and allow 16 Boolean signal inputs.

l The modules on RS485 bus 0 and those on RS485 bus 1 cannot change places with eachother.

l If two PMUs are configured and the settings of their DIP switches are the same, then thetwo PMUs cannot be connected to the same bus.

Monitoring Principles of the DBS3900Figure 7-2 shows the monitoring principles of the DBS3900, where the BBU3900 configuredin the APM30 is taken as an example.

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Figure 7-2 Monitoring principles of the DBS3900

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8 Network Topologies of the DBS3900

About This Chapter

The DBS3900 supports multiple network topologies, such as star, tree, and chain topologies,and supports a maximum of five levels of topologies.

8.1 Network Topologies of the BBU3900The BSC/RNC and BBU3900s support multiple network topologies such as star, chain, tree,and ring.

8.2 Network Topologies of the RRU3908The BBU3900 and RRU3908s support multiple network topologies such as star, chain, and ringtopologies.

DBS3900Product Description 8 Network Topologies of the DBS3900


8-1

8.1 Network Topologies of the BBU3900The BSC/RNC and BBU3900s support multiple network topologies such as star, chain, tree,and ring.

The DBS3900 supports two transmission modes: co-transmission and non co-transmission. Theco-transmission mode is used when the BSC is not far from the RNC or the BSC and RNC arein the same equipment room. In this mode, data of UMTS mode and GSM mode are transmitover one link, thus saving transmission lines and reducing network construction cost. The nonco-transmission mode is more applicable when the BSC is far from the RNC. Figure 8-1 andFigure 8-2 show the co-transmission mode and non co-transmission mode respectively.

Figure 8-1 Co-transmission mode

Figure 8-2 Non co-transmission mode

8 Network Topologies of the DBS3900DBS3900

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Figure 8-3, where the co-transmission mode is taken as an example, shows the typical networktopology of the BBU3900.

Figure 8-3 Typical network topology of the BBU3900

Star TopologyAs the most common network topology, the star topology applies to most areas, especiallydensely populated areas.

Table 8-1 Star topology

Advantage Disadvantage

l The star topology features easymaintenance, engineering, and capacityexpansion.

l Signals are transmitted through only a fewnodes, and therefore line reliability is high.

Compared with other topologies, the startopology requires more transmissionresources.

Chain TopologyThe chain topology applies to belt-shaped and sparsely populated areas, such as highways andrailways.



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Table 8-2 Chain topology


The chain topology reduces the costs oftransmission equipment, construction, andtransmission line lease.

l Signals are transmitted through manynodes, which leads to low line reliability.

l The faults in the upper-level DBS3900may affect the lower-level DBS3900.

l The number of levels in a chain topologycannot exceed five.

Tree Topology

The tree topology applies to areas in which the network structure, site distribution, and subscriberdistribution are complicated, for example, hotspot areas where subscribers are widelydistributed.

Table 8-3 Tree topology


The tree topology requires fewertransmission links than the star topology.

l Signals are transmitted through manynodes, which leads to low transmissionreliability and difficulties in constructionand maintenance.

l The faults in the upper-level DBS3900may affect the lower-level DBS3900.

l Capacity expansion is difficult because itmay require changes in the networkarchitecture.

l The number of levels in the tree topologyshould not exceed five.

Ring Topology

The ring topology applies to common scenarios. Due to its strong self-healing capability, thering topology is preferred if permitted by the routing.

Table 8-4 Ring topology


If the transmission is broken at some point,the ring topology can be automaticallytransformed into a chain or tree topology.

In the ring topology, there is always a linksection that does not transfer any data, whichleads to a waste of transmission resources.

8 Network Topologies of the DBS3900DBS3900

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8.2 Network Topologies of the RRU3908The BBU3900 and RRU3908s support multiple network topologies such as star, chain, and ringtopologies.

Figure 8-4 shows the typical topologies between the BBU3900 and the RRU3908s.

Figure 8-4 Typical topologies between the BBU3900 and the RRU3908s

NOTE

l The RRU3908s support a maximum of three levels of cascading to form the star, chain, or ringnetwork topologies. For the chain and ring topologies, the bandwidth of the transmission data shouldbe taken into account due to the restriction on the bandwidth of the CPRI interface between theBBU3900 and the RRU3908s.

l Currently, GSM+UMTS dual-mode base stations do not support the ring topology.



8-5

9 Operation and Maintenance of the DBS3900

About This Chapter

Operation and maintenance of the DBS3900 performs management, monitoring, andmaintenance of the software, hardware, and configuration of the DBS3900. In addition, itprovides various OM modes and multiple maintenance platforms to meet different maintenancerequirements.

9.1 OM Modes of the DBS3900The DBS3900 supports four types of OM platforms: BTS SMT, NodeB LMT, BSC LMT, andM2000.

9.2 OM Functions of the DBS3900The OM system of the DBS3900 provides powerful functions.

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9-1

9.1 OM Modes of the DBS3900The DBS3900 supports four types of OM platforms: BTS SMT, NodeB LMT, BSC LMT, andM2000.

l BTS SMT

The Site Maintenance Terminal (SMT) is locally connected to the DBS3900 through theEthernet. The maintainer can use the SMT to operate and maintain the DBS3900 in GSMmode. The functions of the BTS SMT are the same as those for the BTS in single mode.

l BSC LMT

The BSC LMT is used for maintenance on GSM carriers of the DBS3900. The functionsof the BSC LMT are the same as those for the BTS in single mode.

l NodeB LMT

– The NodeB LMT is used for maintenance on UMTS carriers of the DBS3900. Thefunctions of the NodeB LMT are the same as those for the NodeB in single mode.

– If the LMT is used to maintain a single UMTS NodeB, you can directly connect theLMT to the UMTS NodeB locally or remotely connect the LMT to the UMTS NodeBthrough an OM channel.

l M2000

The M2000 is the centralized mobile element management center for the WRAN andGBSS. It is used to maintain multiple NodeBs and BTSs in a centralized manner in theaspects of, for example, data configuration (on the CME), alarm monitoring, performancemonitoring, and software upgrade.

Figure 9-1 shows the OM system of the DBS3900.

Figure 9-1 OM system of the DBS3900

9 Operation and Maintenance of the DBS3900DBS3900

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M2000 Element Management Center

RNC UMTS network controller

BSC GSM network controller

9.2 OM Functions of the DBS3900The OM system of the DBS3900 provides powerful functions.

Security ManagementThe 3900 implements level-based management of operation rights to protect the running of theequipment from improper operations. Additionally, before an important OM command isdelivered, a dialog box containing the possible risks brought by this operation is displayed andrequires your confirmation.

Equipment ManagementThe DBS3900 provides functions such as data configuration and status management for internalequipment (including boards and modules) and external equipment (including power supply,environment monitoring, and RET).

Fault ManagementFault management accomplishes functions such as fault detection, alarm reporting, alarm-relatedhandling, and fault isolation and self-healing.

Software ManagementSoftware management provides software downloading and activation, patch upgrade, fileuploading and downloading functions in addition to consistency check of software and hardwareversions, version management, and software version upgrade.

With the USB port on the BBU3900, the DBS3900 can have local software upgrade in theabsence of laptops.

Performance ManagementPerformance management includes subscription of base station performance counters, periodicalcontrol of performance statistics, and measurement, collection, storage, and reporting ofperformance counters.

Commissioning ManagementThe DBS3900 performs commissioning functions in two ways: universal testability frameworkand specific testing/commissioning.

l The universal testability framework provides a universal testing mechanism of test functiondesign to facilitate the future extension testing. It also provides a common test template

DBS3900Product Description 9 Operation and Maintenance of the DBS3900


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regarding the immediate test, periodical task test, and performance counter test, whichfacilitates the template-based extension testing in the future.

l The DBS3900 offers various commissioning/testing functions for convenient maintenanceand troubleshooting:– E1/T1 online Bit Error Rate (BER) test, RTWP test, and CPU occupancy test

– Log functions of the DBS3900 and one-push uploading of DBS3900 logs

– Interface tracing of the Abis , Iub, and internal interfaces

– Local commissioning and redirection of the serial port

Environment MonitoringTypically, the equipment rooms of distributed base stations are unmanned and distributed overa vast area. The equipment in such a room works in a relatively adverse environment, and maybe damaged due to fire, water immersion, or floods. To ensure the normal operation of the BTSequipment and to help you handle various emergencies, the BTS provides a completeenvironment monitoring system.

The environment monitoring system provides customized solutions regarding door control,infrared, smoke, water damage, humidity, and temperature monitoring.

Service Managementl The DBS3900 provides functions such as maintenance on baseband boards, RRUs, RET

antennas, and environment monitoring equipment.l The DBS3900 is in accordance with the Antenna Line Device (ALD) protocol of AISG 2.0

and 3GPP, and downwards compatible with the AISG 1.1 protocol.l By means of the complete self-detection of hardware installation function, the DBS3900

can use the software package stored in the USB disk to perform local upgrade. Thus, timefor upgrade is saved and local commissioning is not required.

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10 Reliability of the DBS3900

The DBS3900 provides a complete redundancy design, which improves the integration ofmodules, reduces the quantity of the components, and greatly enhances the system reliability.

Hardware Reliabilityl Hardware reliability of the BBU3900

– The BBU3900 is equipped with built-in fans in redundancy design. With the intelligenttemperature control technology, the BBU3900 can automatically adjust the speed of theinternal fan under the condition that heat dissipation of the entire DBS3900 worksproperly, thus diminishing equipment noise, reducing damages to the fan, and enhancingreliability and prolonging life of the heat dissipation system. In addition, the BBU3900can control the start/shutdown of the fan and report alarms in the case of fan failures.

– When one of the fans in the BBU3900 is faulty, the DBS3900 can keep operational ifthe system temperature is 10°C lower.

– The power module has protection against overcurrent.

– The BBU3900 supports overtemperature protection. When the internal temperature ishigh, the system automatically enables the overtemperature protection by derating thepower or shutting down the PA based on the current temperature. When the temperaturereverts to the normal value, the system disables the overtemperature protection.

– The optical module is hot-swappable on site, facilitating maintenance.

– The BBU3900 supports environment detection and related alarm reporting.

– The BBU3900 has a mechanism to prevent misinsertion and reverse insertion.

l Hardware reliability of the RRU3908

– Reliability design of input power

For DC power input, the RRU3908 allows the voltage in the range of -36 V DC to -57V DC. The RRU3908 is operational even when peak input voltage reaches -60 V DC,thus preventing damage caused by unstable power input.

– Overtemperature protection

When the ambient temperature of the RRU is too high, the system automatically enablesthe over-temperature protection to prevent the equipment from damage. When thetemperature reverts to the normal value, the system disables the over-temperatureprotection.

DBS3900Product Description 10 Reliability of the DBS3900


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Software ReliabilityThe software reliability refers to the error tolerance ability. When the software is faulty, it doesnot affect the entire DBS3900 because the self-healing ability of the DBS3900 protects thesystem from breakdown. The error tolerance of the BBU3900 and RRU3908 software coversthe aspects described in the following sections.

l Scheduled detection of key resourcesThe DBS3900 performs occupancy check on software resources. If resource hang-upoccurs due to software faults, the system can release the unavailable resources in time andexport logs and alarms.

l Parameter checkValidity check is performed on all the commands and parameters of the LMT/OMC. Thedata in the configuration file is also checked upon start of the file to ensure stable runningof the system. During the running of software, the DBS3900 monitors the internal errorsof all software and some hardware faults, if any. The DBS3900 also has a monitoringprocess to monitor running status and report alarms when the system is faulty.

l Protection against software failuresTwo software versions and two data versions are stored in the DBS3900. If a fault occursduring software upgrade, the system automatically rolls back to the earlier version, thuslessening the possibility of processing the fault on the site in the case of softwaredownloading failures.

l Data checkThe system checks data consistency on a regular or event-triggering basis, restores dataconsistency selectively or preferably, and generates related logs and alarms.

l Storage of operation logsThe DBS3900 records the operations performed in a period and stores them in the operationlogs. When the system incurs an unknown error, the maintenance personnel can locate theproblem by tracing back to the normal status, or perform the data restoration.

l BackupThe DBS3900 supports backup of transport links.

10 Reliability of the DBS3900DBS3900

Product Description


Issue 01 (2008-10-30)

11 Specifications of the DBS3900

The technical specifications of the DBS3900 cover items such as the frequency band, outputpower, and engineering.

Frequency Band

Table 11-1 shows the frequency bands supported by the DBS3900.

Table 11-1 Frequency bands supported by the DBS3900

Operating FrequencyBand

RX Frequency Band(MHz)

TX Frequency Band(MHz)

Band I (900 MHz) 890 to 915 935 to 960

Band II (900 MHz) 880 to 905 925 to 950

Band III (850 MHz) 824 to 849 869 to 894

Band IV (1,800 MHz) 1,710 to 1,755 1,805 to 1,850

Band V (1,800 MHz) 1,740 to 1,785 1,835 to 1,880

Band VI (1,900 MHz) 1,850 to 1,890 1,930 to 1,970

Band VII (1,900 MHz) 1,870 to 1,910 1,950 to 1,990

Output Power

Table 11-2 describes the output power of the RRU3908 working.

Table 11-2 Output power of RRU3908

Number of GSMCarriers

Number of UM TSCarriers

Power per GSMCarrier (W)

Power per UMTSCarrier (W)

1 0 40 0

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Number of GSMCarriers

Number of UM TSCarriers

Power per GSMCarrier (W)

Power per UMTSCarrier (W)

2 0 40 0

3 0 20 0

4 0 20 0

5 0 12 0

6 0 12 0

1 1 30 30

1 1 40 30

1 1 30 40

1 1 20 40

1 1 40 20

1 2 20 20

2 1 20 20

2 1 15 30

2 1 15 40

2 2 15 15

2 2 15 20

3 1 12 30

3 2 12 15

3 2 14 12

4 1 12 12

4 2 10 10

5 1 10 10

0 1 0 40

0 2 0 30

0 3 0 20

0 4 0 15

11 Specifications of the DBS3900DBS3900

Product Description


Issue 01 (2008-10-30)

NOTE

l The GSM mode complies with the 3GPP 45005.8.2.0 specification of multi-carrier BTS Class II.

l The GU mixed mode complies with the 3GPP 25.104.

l In current software version, 1800M can only support GSM mode, the specification for GU mixedmode and UMTS mode is not applied for 1800M band.

Receiver SensitivityTable 11-3 lists the static receiver sensitivity of the DBS3900.

Table 11-3 Static receiver sensitivity of the DBS3900

Working Mode 1-way receiversensitivity (dBm)

2-way receiversensitivity (dBm)

Remarks

GSM -113 -116 -

UMTS -125.5 -128.3 As recommended in3GPP TS 25.104, thereceiver sensitivity(full band) ismeasured at theantenna connector oncondition that thechannel rate reaches12.2 kbit/s and theBER is not higherthan 0.001.

–126.2 -129 The receiversensitivity (at thecentral frequencypoint) is measured atthe antennaconnector oncondition that theAMR service at 12.2kbit/s is used and theBER is not higherthan 0.001.

DimensionsTable 11-4 lists the mechanical dimensions of the DBS3900.

Table 11-4 Dimensions

ConfigurationType

Width (mm) Depth (mm) Height (mm)

BBU3900 442 310 86



11-3

ConfigurationType

Width (mm) Depth (mm) Height (mm)

RRU3908 (withoutthe housing)

356 140 480

RRU3908 (with thehousing)

380 170 485

Weight

Table 11-5 lists the weight of the DBS3900.

Table 11-5 Weight

Configuration Type Weight (kg)

BBU3900 ≤ 12

RRU3908 (without the housing) ≤ 21

RRU3908 (with the housing) ≤ 23

Power Supplyl Table 11-6 describes the power input of the BBU3900.

Table 11-6 Power input of the BBU3900

Power Type Permissible Range

-48 V DC -38.4 V DC to -57 V DC

l Table 11-7 describes the power input of the RRU3908.

Table 11-7 Power input of the RRU3908

Power Type Permissible Range

-48 V DC -36 V DC to -57 V DC

Power Consumption

The power consumption of the DBS3900 in typical configuration is listed in Table 11-8 andTable 11-9.


Product Description


Issue 01 (2008-10-30)

Table 11-8 Power consumption of the DBS3900 in GSM mode

GSMMode

S1/1/1 (40W)

S2/2/2 (30W)

S3/3/3 (20W)

S4/4/4 (15W)

S5/5/5 (12W)

S6/6/6 (10W)

DBS3900(typicalpowerconsumption)

740 840 780 780 690 700

DBS3900(maximum powerconsumption)

770 1,070 1,170 1,340 1,190 1,150

NOTE

The typical power consumption is the measurement value when the traffic load is 30% and power controland DTX are set to ON.

Table 11-9 Power consumption of the DBS3900 in UMTS mode

UMTS Mode S1/1/1 (20 W) S2/2/2 (20 W) S3/3/3 (20 W) S4/4/4 (20 W)

DBS3900(typical powerconsumption)

490 640 880 880

DBS3900(maximumpowerconsumption)

590 790 1,100 1,110

Transmission Portsl Table 11-10 describes the transmission ports on the BBU3900.

Table 11-10 Transmission ports on the BBU3900

Interface Port Type Quantity Transmission Rate

ConnectorType

Abisinterface

E1/T1 One port, supporting fourE1s/T1s

E1: 2 Mbit/s; T1: 1.5Mbit/s

DB44 male



11-5

Interface Port Type Quantity Transmission Rate

ConnectorType

FE 2 10/100Mbit/s

l electricalport:RJ45connector

l opticalport: SFP

Iubinterface

E1/T1 One port, supporting fourE1s/T1s

E1: 2 Mbit/s; T1: 1.5Mbit/s

DB44 male

FE 2 10/100Mbit/s

l electricalport:RJ45connector

l opticalport: SFP

PortsconnectingtheBBU3900and theRRU3908

CPRI(V3.0)

GSM 6 1.25 Gbit/s SFP

GSM+UMTS

3

UMTS 3

NOTE

The CPRI port can be an optical port that can connect the BBU and RRU, with the maximum distancebetween the RRU and the BBU reaching 500 m in the case of multi-mode optical cables and 40 kmin the case of single-mode optical cables. The CPRI can also be an electrical port. In this case, theshielded twisted-pair cable is used, with the maximum distance between the BBU and the RRUreaching only several meters and the CPRI port having a bandwidth of 1.25 Gbit/s. This mode appliesto the RRU centralized installation and assembled installation scenarios.

l Table 11-11 describes the transmission ports on the RRU3908.

Table 11-11 Transmission ports on the RRU3908

Port Type Quantity TransmissionRate

Connector Type

CPRI (V3.0) 2 1.25 Gbit/s SFP (electrical/optical port)


Product Description


Issue 01 (2008-10-30)

Operating Environmentl Table 11-12 describes the operating environment of the BBU3900.

Table 11-12 Operating environment of the BBU3900

Item Range

Temperature -20℃ to +55℃

Relative humidity 5% RH to 95% RH

l Table 11-13 describes the operating environment of the RRU3908.

Table 11-13 Operating environment of the RRU3908

Item Range

Temperature -40℃ to +50℃ (without solar radiation)-40℃ to +45℃ (with solar radiation of1,120 W/m2)

Relative humidity 5% RH to 100% RH

Absolute humidity (1 to 30) g/m3

Air pressure 70 kPa to 106 kPa



11-7

12 Compliance Standards of the DBS3900

The DBS3900 complies with the standards of EMC, acoustic noise, working environment,transportation, storage, and anti-seismic performance.

EMC

The DBS3900 meets the Electromagnetic Compatibility (EMC) requirements in compliancewith the following standards:

l R&TTE Directive 1999/5/EC

l R&TTE Directive 89/336/EEC

l 3GPP TS 25.113 V3.2.0 (2000-06)

l ETSI EN 301489-1/23

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

l ITU-R SM.329-10

Storage environment

The storage environment complies with the following standard:

ETSI EN300019-1-1 class1.2 "Weather protected, not temperature-controlled storage locations"

Transportation Environment

The transportation environment complies with the following standard:

ETSI EN300019-1-2 class 2.3 "Public transportation"

Anti-Seismic Performance

The DBS3900 complies with the following standard:

l IEC 60068-2-57 (1999-11) Environmental testing -Part 2-57: Tests -Test Ff: Vibration-Time-history method

l YD5083-99: Interim Provisions for Test of Anti-seismic Performances ofTelecommunications Equipment (telecom industry standard in People's Republic of China)

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Documents

DBS3900 Product Description(V100R001_01)