Bts Micro Ibs Dbs3900

Product Description

DBS3900 V300R008

Issue 04

Date 2008-06-11

HUAWEI TECHNOLOGIES CO., LTD.

DBS3900 V300R008 Product Description

Issue 04 (2008-06-11) Commercial in Confidence Page 2 of 46

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About This Document

Author Prepared by Ji Li Date 2008-04-23

Reviewed by Liu Jianyun, Ji Fei , Huang Xianlu, Tian Xiangyu

Date 2008-04-24

Approved by Feng Baoshun Date 2008-04-25

Summary This document describes the distributed base station in terms of features, system structure, functions, O&M, reliability, and technical specifications.

This document provides the basic technical features, performance specifications, and design principles of the distributed base station.

The following table shows the organization of this document.

Chapter Content

1 Introduction to DBS3900

This chapter introduces the position of the DBS3900 in the GSM network and their features.

2 Features of the DBS3900

This chapter introduces the main features of the DBS3900.

3 System Architecture

This chapter introduces the physical architecture, functional architecture, and configuration of the DBS3900.

4 Services and Features

This chapter introduces the main services and features of the DBS3900.

5 Operation and Maintenance

This chapter introduces the structure and functions of the operation and maintenance of the DBS3900.

6 Reliability This chapter introduces the measures taken in reliability design of the DBS3900 in terms of system, hardware, and software.

7 Technical Specifications

This chapter lists the main performance and engineering specifications of the DBS3900.



Chapter Content

8. Installation This chapter introduces the installation of the DBS3900.

A Standards The appendix lists the technical standards complied by the DBS3900.

B Glossary The appendix lists the glossary involved in this manual.

C Acronyms and Abbreviations

The appendix lists the acronyms and abbreviations involved in this manual.



History Issue Description Issue Date Author Approved by

01 Initial commerial release

2008-03-21 Ji Li Feng Baoshun

02 Second commerial release

2008-04-25 Ji Li Feng Baoshun

03 Third commerial release

2008-05-20 Li Haixia Feng Baoshun

04 Forth commerial release

2008-06-11 Li Haixia Feng Baoshun



Contents

1 Introduction to DBS3900 ............................................................................................... 9 1.1 Solutions of the DBS3900............................................................................................................ 9

1.1.1 Basic Functional Modules ................................................................................................... 9 1.1.2 Scenarios for the DBS3900................................................................................................11

1.2 Advantages of the DBS3900.......................................................................................................11 1.2.1 Fast Network Deployment ................................................................................................. 12 1.2.2 Low Costs......................................................................................................................... 12 1.2.3 High Reliability .................................................................................................................. 12

2 Features of the DBS3900............................................................................................. 13 2.1 Coverage Capability .................................................................................................................. 13 2.2 Capacity.................................................................................................................................... 13 2.3 Networking Capability................................................................................................................ 13 2.4 Clock and Synchronization ........................................................................................................ 14 2.5 Multi-Band Application ............................................................................................................... 14 2.6 Antenna..................................................................................................................................... 14 2.7 Installation................................................................................................................................. 15

2.7.1 Installation of the BBU....................................................................................................... 15 2.7.2 Installation of the RRU ...................................................................................................... 15

2.8 Environment Adaptability ........................................................................................................... 15 2.9 Operation and Maintenance....................................................................................................... 16 2.10 High-Velocity MS Application ................................................................................................... 16 2.11 Capacity Expansion and Evolution ........................................................................................... 16

2.11.1 Capacity Expansion......................................................................................................... 16 2.11.2 Evolution ......................................................................................................................... 16

3 System Architecture .................................................................................................... 18 3.1 Functional Architecture of the BBU ............................................................................................ 18

3.1.1 Functional Modules........................................................................................................... 18 3.1.2 BTS Interface Unit............................................................................................................. 19 3.1.3 Central Processing Unit..................................................................................................... 19 3.1.4 High-Speed Interface Unit ................................................................................................. 19 3.1.5 Clock Unit ......................................................................................................................... 19 3.1.6 Monitoring Unit.................................................................................................................. 19

3.2 Functional Architecture of the RRU............................................................................................ 20 3.2.1 Functional Modules........................................................................................................... 20



3.2.2 High-Speed Interface Module............................................................................................ 20 3.2.3 Signaling Processing Unit ................................................................................................. 20 3.2.4 PA..................................................................................................................................... 21 3.2.5 Dual Duplexer ................................................................................................................... 21 3.2.6 LNA .................................................................................................................................. 21

4 Services and Features ................................................................................................. 22 4.1 Services .................................................................................................................................... 22 4.2 Features.................................................................................................................................... 22

5 Operation and Maintenance ........................................................................................ 25 5.1 O&M System............................................................................................................................. 25 5.2 O&M Functions ......................................................................................................................... 26

5.2.1 Security Management ....................................................................................................... 26 5.2.2 Equipment Management ................................................................................................... 26 5.2.3 Configuration Managment ................................................................................................. 26 5.2.4 Software Management ...................................................................................................... 26 5.2.5 Alarm Management........................................................................................................... 26 5.2.6 Environment Monitoring .................................................................................................... 26 5.2.7 Performance Management................................................................................................ 27

6 Reliability ...................................................................................................................... 28 6.1 System Reliability ...................................................................................................................... 28 6.2 Hardware Reliability................................................................................................................... 29

6.2.1 Hardware Reliability of the BBU ........................................................................................ 29 6.2.2 Hardware Reliability of the RRU........................................................................................ 30

6.3 Software Reliability.................................................................................................................... 30 6.3.1 Regular Check on Key Resources..................................................................................... 30 6.3.2 Parameters Check ............................................................................................................ 30 6.3.3 Software Failure Protection ............................................................................................... 30 6.3.4 Data Check....................................................................................................................... 30 6.3.5 Saving Operation Log Information ..................................................................................... 31 6.3.6 Backup ............................................................................................................................. 31

7 Technical Specifications.............................................................................................. 32 7.1 Radio Specifications .................................................................................................................. 32 7.2 Transmit Specifications.............................................................................................................. 32 7.3 Receive Sensitivity .................................................................................................................... 33 7.4 Dimensions ............................................................................................................................... 33 7.5 Weight....................................................................................................................................... 33 7.6 Power Supply ............................................................................................................................ 34

7.6.1 Power Input of the BBU..................................................................................................... 34 7.6.2 Power Input of the RRU .................................................................................................... 34

7.7 Power Consumption .................................................................................................................. 34



7.8 Ports ......................................................................................................................................... 35 7.8.1 Transmission Ports on the BBU......................................................................................... 35 7.8.2 External Alarm Ports on the BBU....................................................................................... 35 7.8.3 Other External Ports on the BBU....................................................................................... 36 7.8.4 Transmission Port on the RRU.......................................................................................... 36 7.8.5 External Alarm Ports on the RRU ...................................................................................... 36 7.8.6 Other External Ports on the RRU....................................................................................... 37

7.9 Lightning Protection Specifications............................................................................................. 37 7.9.1 Lightning Protection Specifications for the BBU ................................................................. 37 7.9.2 Lightning Protection Specifications for the RRU................................................................. 38

7.10 Operating Environment............................................................................................................ 39 7.10.1 Operating Environment of the BBU.................................................................................. 39 7.10.2 Operating Environment of the RRU ................................................................................. 39

7.11 EMC........................................................................................................................................ 39 7.12 Acoustic Noise......................................................................................................................... 40 7.13 Storage Environment ............................................................................................................... 40 7.14 Transportation Environment..................................................................................................... 40 7.15 Anti-Seismic Protection............................................................................................................ 40 7.16 Operating Requirements.......................................................................................................... 40

8 Installation .................................................................................................................... 41

A Technical Standards .................................................................................................... 42 A.1 EMC (Electromagnetic Compatibility) Standards........................................................................ 42 A.2 Acoustic Noise Standards.......................................................................................................... 42 A.3 Storage Environment................................................................................................................. 42 A.4 Transportation Environment ...................................................................................................... 42 A.5 Working Environment................................................................................................................ 42 A.6 Anti-Seismic Performance ......................................................................................................... 43

B Glossary ....................................................................................................................... 44

C Acronyms and Abbreviations ..................................................................................... 45



1 Introduction to DBS3900

1.1 Solutions of the DBS3900 The DBS3900 is a distributed base station which adopts the unified BTS platform developed by Huawei. As a GSM BTS, the DBS3900 mainly consists of the baseband control unit (BBU) and remote radio unit (RRU). The baseband control unit is the BBU3900. The remote radio unit is RRU3004, of which the RRU3004 supports four transceivers.

The DBS3900 employs radio module remote technique, meeting GSM network construction requirements of capacity expansion, flexible installation and evolution.

The CPRI interface is implemented between the RRU3004 and BBU3900, through which the optical cables can be used to connect the two modules. This facilitates site acquisition, equipment room construction, device transportation, and equipment installation.

The introduction of the DBS3900 distributed BTS will boost the development of the mobile network, enable the mobile network to be compatible, broadband-based, environment-friendly, and evolutional, and help the telecom operators to build a better future-oriented mobile network.

Unless otherwise specified, BBU is short for BBU3036 in this document and RRU is short for RRU3004.

1.1.1 Basic Functional Modules

BBU3900 The BBU3900 is an indoor baseband control unit that performs centralized management (O&M and signaling processing) of the entire base station system and provides the timing reference for the system. It also provides physical interfaces for connection with the BSC and the RRU3004. The BBU3900 is housed in a rack with 2 U in length and 19 inches in width. It can be installed in a standard 19-inch cabinet, a RRU3004 rack, or on the wall.

Figure 1-1 shows the BBU3900.



Figure 1-1 BBU3900

Additional cards can be inserted into the BBU3900 to provide functions such as environment monitoring and Abis bypass, as well as GPRS clock signals. The BBU3900 requires very small floor space, and it is easy to install. It provides comprehensive functions and consumes a small amount of power. It can be installed easily in your existing site.

RRU3004 The RRU3004 is an outdoor remote radio unit. It processes baseband signals and RF signals. One RRU3004 module provides two transceivers. If two RRU3004 modules are combined and mounted in the RRU3004 rack, four transceivers are available.

Figure 1-2 shows a single RRU3004 module.

Figure 1-2 A single RRU3004 module

A single RRU3004 module supports two transceivers. A RRU3004 rack with two assembled RRU3004 modules can support four transceivers. Figure 1-3 shows a RRU3004 rack.



Figure 1-3 RRU3004 rack

The compact RRU3004 is light in weight and easy to install. The RRU3004 rack can be directly mounted on the metal pole, tower, stand, or wall.

1.1.2 Scenarios for the DBS3900 The RRU3004 and BBU3900 can be flexibly combined to meet different application requirements.

Table 1-1 lists the scenarios for the DBS3900.

Table 1-1 Scenarios for the DBS3900

Module Scenario

BBU l Indoors l It can be mounted on the wall, or installed in the 19-inch cabinet or

rack, RRU3004 rack, APM, or OFB.

RRU l Indoors/outdoors l Distributed base station coverage in cities, roads, and railways

1.2 Advantages of the DBS3900 The DBS3900 can be used as a substitute for a macro base station in terms of performance. The following describes the benefits of the DBS3900 solution.



1.2.1 Fast Network Deployment l The separation of the BBU and RRU, the compact design, and the distributed

installation allow you to mount the BBU and RRU in available space. You do not have to care much about load capacity or extra installation space.

l The distributed installation facilitates transportation and thus meets the economical and speedy network deployment.

1.2.2 Low Costs l The BBU can be mounted against the wall of the corridor, staircase, or basement.

It can also be mounted inside the existing device such as outdoor BTS, transmission device, and power supply system. These installation features help reduce the investment in floor space.

l The RRU can be installed close to the antennas. This helps reduce the cable loss, save cost on the feeders and expand the coverage.

1.2.3 High Reliability l Each RRU provides two CPRI high-speed ports to enable the RRU and BBU

being interconnected in a ring topology. One additional CPRI port provides a backup channel between the BBU and the RRU.

l Each rack can be configured with two RRU3004 modules, supporting transmit diversity, more carriers, and higher power. If one RRU3004 module in the cabinet fails, the other RRU3004 module can keep providing services for the cell it serves.



2 Features of the DBS3900

2.1 Coverage Capability

The DBS3900 has the following benefits in terms of coverage:

l The RRU3004 supports the cascading of three RRU modules. One RRU module can be placed 40 km away from the BBU.

l High receive sensitivity: The static sensitivity of the TCH/FS is -113 dBm (typical value in normal temperature).

l Power Boost Technology (PBT) is supported by RRU3004. l The maximum output power (TOC) of the RRU3004 can reach up to 40 W (900M)

or 30 W (1800M). l A maximum of 12 cells can be configured and multi-band networking is

supported. l Antenna hopping and transmit diversity are supported.

2.2 Capacity l One RRU3004 provides two transceivers and two assembled RRU3004s provide

four transceivers. l 72 transceivers are supported by BBU3900. l Abis over IP is available.

2.3 Networking Capability l E1/T1, FE optical, microwave and satellite transmission are supported. l Star, tree, chain, ring, and hybrid topologies are supported. l Flex Abis networking is supported. l The GSM and UMTS can share the BBU3900. l The transmission on the Abis interface is optimized. The detection and

restoration of idle frames on the BTS and BSC side are supported. However, no idle frames are transmitted over the transport lines to save the transmission bandwidth.



2.4 Clock and Synchronization l When the synchronization clock operates in free-run mode, the system can

operate normally for at less than 7 days in succession. l Software synchronization mode is supported. l Phase-locked, fast pull-in, and holdover functions, as well as free run mode, are

supported. l Synchronization with the clock extracted from the Abis interface (default) is

supported. l Synchronization with the Global Positioning System (GPS) equipment is

supported. l Synchronization with the external 2 MHz BITS clock is supported.

2.5 Multi-Band Application l The RRU3004 can operate over the 1800 MHz and 900 MHz bands.

2.6 Antenna The antenna has the following features:

l Remote Electric Tilt (RET) antenna is supported. The RET supports remotely adjustment of the antenna downtilt to optimize network performance. The maintenance personnel can use the RET in the equipment room to precisely adjust the network coverage. This minimizes the maintenance operation and saves the maintenance cost.

The RET has a built-in mechanically adjustable phase shifter, which is driven by a stepper motor outside the antenna. On the LMT, the maintenance personnel issues command, upon which the stepper motor adjusts the phase of the phase shifter to adjust the antenna dowtilt.

l Dual polarization antenna is supported to reduce the number of antennas in the cells.

l Antenna Interface Standards Group (AISG1.1) protocol is supported.

AISG is a standardization organization established by several equipment suppliers. It aims to achieve internationally accepted antenna interfacing. The AISG protocols specify unified standards for antenna devices such as Remote Electrical Tilt (RET) and Tower Mounted Amplifier (TMA). These standards apply to physical layer (L1), data link layer (L2), and application layer (L7). The AISG protocol also defines the specifications for hardware such as connectors and sockets. The RRU3004 AISG interface is mainly used for the power supply and control of the TMA and Remote Electrical Tilt (RET).



2.7 Installation 2.7.1 Installation of the BBU

The BBU has the following installation features:

l The compact BBU is single equipment that is 19 inches in width and 2 U in height. It is small and light, and thus has low requirements for floor space, bearing capacity, and installation costs and complexity. This meets the economical and speedy network deployment for the operator.

l It can be installed in a 19-inch standard cabinet or the RRU3004 rack, or mounted on the wall or stand without extra space.

l You can install or pull out the BBU using its front handle, which simplifies the installation.

2.7.2 Installation of the RRU The RRU has the following installation features:

l The RRU is small and light, and does not have strict requirements for bearing capability.

l The installation of the RRU is flexible. − Through the RRU3004 rack, the RRU3004 can be mounted on the metal pole,

wall, stand, or tower, depending on field requirements. l It can be mounted outdoors without equipment room or air conditioner. This

meets the economical and speedy deployment. l As the cables for the RRU are led out from its bottom, multiple RRU modules can

be installed in parallel or separately. l You can install or pull out multiple modules in parallel using the front handle,

which simplifies the installation.

2.8 Environment Adaptability

BBU The BBU is a type of indoor equipment. The environment adaptability of the BBU is as follows:

l Working temperature range: –20°C to + 55°C. The BBU is functional within the working temperature range.

l The BBU is functional within a wide operating voltage range from –38.4 V DC to –57 V DC (rated voltage of –48 V DC).

l The matched power module can convert the 220 V AC power into the –48 V DC power for the use of the BBU

RRU The RRU is a type of outdoor equipment that is adaptable to reverse environment. It can also be deployed indoors. The environment adaptability of the RRU is as follows:



l The RRU has a sealed integrated structure. It is waterproof and dustproof in compliance with the International Protection standard (IP65). The protection against moisture, mould, and salt fog damage meets Class 1. The sealed integrated structure also prevents the RRU from solar radiation and adverse environments.

l The operation temperature of the RRU ranges from –40°C to +50°C. l The RRU is functional within a wide operating voltage range from –36 V DC to

–57 V DC (rated voltage of –48 V DC). l The matched power module can convert the 220 V AC power into the –48 V DC

power for the use of the RRU.

2.9 Operation and Maintenance In terms of O&M, the RRU and BBU feature the following:

l Local maintenance, remote maintenance and centralized network management are supported.

l The RRU supports the topology scanning function. The changes in topology structure are automatically monitored by the system so that manual operations are reduced.

l The RRU maintenance cavity is designed with two buttons, one for antenna path test, and the other for CPRI loop test. When installing the RRU or locating faults of the RRU, the Test LED on the RRU helps you know the status of the antenna path and the CPRI port.

l The OMStar maintenance tool helps improve maintenance efficiency and reduce maintenance cost on site.

2.10 High-Velocity MS Application The DBS3900 allow the MS to move in a cell at the velocity of up to 400 km/h. The MS can make calls on express trains or magnetic suspension trains.

2.11 Capacity Expansion and Evolution 2.11.1 Capacity Expansion

l A maximum of two BBUs can be connected to expand the capacity. They are connected through high-speed electrical ports.

l Cassette-shaped BBU facilitates capacity expansion and installation. l One RRU3004 rack can be configured with two RRU3004 modules, enabling

4-way receive diversity. l The RRUs can be cascaded to enable capacity expansion.

2.11.2 Evolution l The DBS3900 supports the smooth evolution to the GERAN and LTE.



l The DBS3900 adopts the unified BTS platform developed by Huawei Wireless and enables the smooth evolution from 2G to 3G.



3 System Architecture

3.1 Functional Architecture of the BBU 3.1.1 Functional Modules

Figure 3-1 shows the working principle of the BBU.

Figure 3-1 Working principle of the BBU

Sitemaintenance

terminalCentral processing unit

High-speedinterface unitBTS interface unit

Clock unit

BSC

MMI

Abis

Maintenancepath

RRU

Control path

Servicedata path CPRI

BBU

Monitoring unit

Environmentmonitoring bus

Boolean alarm input

Timing Framenumber

and clockExternal

synchronization clock

As shown in Figure 3-1, the BBU consists of the following functional modules:

l BTS Interface Unit l Central Processing Unit l High-Speed Interface Unit



l Clock Unit l Monitoring Unit

The BBU also consists of the fan module and power module.

3.1.2 BTS Interface Unit The BTS interface unit performs the following functions:

l Connects the BTS to the BSC l Exchanges timeslot data between the E1 links and the DBUS l Synchronizes the lower-level clock with the upper-level clock

3.1.3 Central Processing Unit The central processing unit performs centralized management (OM and signaling processing) of the entire distributed base station system. It also provides the reference clock for the system.

l Supports the UART and HDLC communication protocols l Controls the BTS interface unit and communicates with the BSC and BTS l Controls the RF interface unit and communicates with the RRU l Performs clock module functions such as providing and managing BTS clock

signals and supporting external synchronization clock input.

3.1.4 High-Speed Interface Unit The high-speed interface unit performs the following functions:

l Receives uplink baseband data from the RRU. l Transmits downlink baseband data to the RRU. l Each BBU provides six SFP optical ports.

3.1.5 Clock Unit The clock unit performs the following functions:

l Provides high-precision clock source for the BTS and provides system clock based on this clock source

l Checks the phase-locked state, provides phase lock for the software, provides DA adjustment, and generates frame numbers

3.1.6 Monitoring Unit The monitoring unit collects Boolean alarm information, and reports the alarm information to the central processing unit.



3.2 Functional Architecture of the RRU 3.2.1 Functional Modules

Figure 3-2 shows the working principle of the RRU3004.

Figure 3-2 Working principle of the RRU3004

RRU3004

High-speed interface unit

Processing unit for

TX signals

Processing unit for

RXsignals

Controlmodule

DAC

DAC

ADC

ADC

PA

PALOA D

LNA

LNA

BBU

BBU/RRU

Duplexer

TX1RX1

TX2RX2

RXD_INRXM_OUT

Opticalinterface

Antennasystem

Carrier detectionSignal

processing

CMD

As shown in Figure 3-2, the RRU consists of the following modules:

l High-speed interface module l Signaling processing unit l Power Amplifier (PA) l Dual Duplexer l LNA

The following sections describe these modules in details.

3.2.2 High-Speed Interface Module The high-speed interface module performs the following functions:

l Receives the DL data from the upper-level equipment (BBU). l Sends UL data to the upper-level equipment (BBU). l Forwards the data of the cascaded RRU.

3.2.3 Signaling Processing Unit The signal processing unit consists of two uplink RX channels, two downlink TX channels, and a control module. The signal processing unit processes baseband signals and RF signals. The baseband signal processing refers to decoding GMSK and 8PSK baseband signals.



The uplink RX channel performs the following functions:

l Converts the RX signals down to intermediate frequency signals. l Amplifies the intermediate frequency signals and demodulates IQ signals. l Performs analog-to-digital conversion through the ADC. l Samples digital signals. l Filters signals. l Digital Automatic Gain Control l Collects and process data.

The downlink TX channel performs the following functions:

l Receives and processes the clock signals, control signals, and data signals, and then transmit them to relevant units.

l Performs shape filtering of the downlink signals. l Performs analog-to-digital conversion through the DAC and IQ demodulation. l Up-converts RF signals.

The control module performs the following functions:

l Performing initialization and data loading of the RRU l Collecting alarm information and reporting board status l Receiving configuration commands of the BBU and performing configuration

management of other modules l Providing a channel for operating and maintaining the RRU

3.2.4 PA The PA performs the following functions:

l Determining the combining or dividing output of two routes of carrier signals l Amplifying low power RF signals from the signal processing unit

3.2.5 Dual Duplexer The dual duplexer performs the following functions:

l Multiplexes RX signals and TX signals to enable the RX signals and TX signals to share the same antenna channel.

l Filters the RX signals and TX signals.

3.2.6 LNA The LNA amplifies the signals received from antennas.



4 Services and Features

4.1 Services Table 4-1 lists the services provided by the DBS3900.

Table 4-1 DBS3900 service list

Service Abbreviation Description

EFR Enhanced full rate speech service

FR Full rate speech service

HR Half rate speech service

Speech service

AMR Adaptive multi-rate

F9.6 9.6 kbit/s full rate data service

F4.8 4.8 kbit/s full rate data service

Data service

F2.4 ü 2.4 kbit/s full rate data service

GPRS CS1/CS2/CS3/CS4 packet service Packet service

EDGE MCS1–MCS9 EGPRS packet service

4.2 Features This section describes the features of the DBS3900.

EDGE l The DBS3900 support system information broadcast and resource indication,

which are compatible with the GSM/EDGE R99. l The DBS3900 support GSM/EDGE LAPDm protocol.



Handover The DBS3900 support the following handovers:

l Synchronous handover l Asynchronous handover l Dual-band handover

Frequency Hopping The DBS3900 support the following hopping mechanisms:

l Baseband hopping l RF hopping

Flexible Allocation of Resources l Dynamic MAIO l Dynamic PBT

Antenna hopping The DBS3900 support antenna hopping.

Encryption The DBS3900 support the following non-encryption, encryption, and decryption features:

l A5/0 non-encryption l A5/1, A5/2, and A5/3 encryption/decryption

Power Control The DBS3900 support the following power control mechanisms:

l Static power control l Dynamic power control

Detection The DBS3900 support the following detection mechanisms:

l Detection of random access collision l In-position detection of the main boards and modules l Detection and report of the RRU output power

Extended Cell The DBS3900 support extended cell function, through which the DBS3900 can cover an area of up to 120 km.



Location Services The DBS3900 supports the location services based on Cell ID.

Remote Electrical Tilt (RET) Antenna The DBS3900 support RET antenna, which facilitates the adjusting of the antenna tilt, and thus facilitates the optimization of the network coverage.

The RRU provides the multi-wire RET interface that complies with the AISG interface specifications. The multi-wire mode is defined through a controlling cable, which applies to the scenario where the RRU and the antenna are closely installed.

The RET antenna feature complies with the AISG1.1 protocol.



5 Operation and Maintenance

5.1 O&M System The RRU3004 and BBU3900 support provide the O&M system based on MMI, BIN Web UI, SNMP, and CLI. Figure 5-1 shows the topology of the O&M subsystem.

Figure 5-1 Topology of the O&M subsystem

Site MaintenanceTerminal System

MMI

MMI

BTS

BTS

BSC

Abis

Abis

OMCServer

Hub

Remote SiteMaintenance System

Site MaintenanceTerminal System

O&M Platform The DBS3900 supports the Local Maintenance Terminal (LMT) O&M platform. The LMT can be used to maintain the items of one BTS, such as software upgrade, data loading, alarm collection, and equipment maintenance, etc.

O&M Modes The DBS3900 supports two types of O&M modes: local maintenance and remote maintenance.

l Local maintenance You can maintain the BTS by directly connecting the LMT to the BTS.

l Remote maintenance You can maintain the BTS in the BSC equipment room or the maintenance center by accessing the LMT to the route provided by the BSC.



5.2 O&M Functions The OM system of the DBS3900 places great emphasis on your requirements for operation and maintenance and offers powerful functions in the following aspects

5.2.1 Security Management The DBS3900 authorizes the maintenance personnel with hierarchical operation rights to ensure the system security.

At the same time, it prompts the acknowledgement dialog box for the maintenance personnel to confirm before some important O&M commands are issued.

5.2.2 Equipment Management Equipment management involves equipment maintenance and data configuration. Real-time maintenance and data configuration can be performed through various means.

5.2.3 Configuration Managment Configuration management involves the following features:

l Consistency check for adding, deleting, and modifying the BTS data l Dynamic configuration and static configuration

In dynamic configuration mode, the modified data takes effect immediately. In static configuration mode, the modified data takes effect only when the BTS is reset.

l Automatic data backup

5.2.4 Software Management Software management involves the compatibility check of the software version and hardware version, version management, software upgrade, etc.

5.2.5 Alarm Management Alarm management involves the following features:

l Query of real-time alarms and history alarms l Collection of internal and external alarms such as the environment monitoring

device inputs and Boolean inputs l Alarm correlation processing, which ensures precision and accuracy of alarm

locating l Saving, interpreting, prompting, shielding, filtering, confirming, clearing, post

processing, and reporting of the alarms

5.2.6 Environment Monitoring The equipment room for the distributed base station is typically unmanned and distributed over a vast area. The equipment in such a room works in a relatively adverse environment, and may incur fires, water immersion, or flood. To help you handle such emergencies, the BTS provides a complete environment monitoring system.



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

5.2.7 Performance Management Performance management involves the following features:

l Measures and reports performance counters based on services requirements l Monitors the performance of the internal and external telecommunications

networks, and generates alarms when the performance deteriorates l Monitors the operating status of the system, monitors the traffic volume on the

ports, and measures the technical data of the operating system l Monitors the usage information of the key devices in the boards, such as CPU

and DSP



6 Reliability

6.1 System Reliability The system reliability of the BBU and RRU involves the following aspects:

The RRU supports soft reset. In a chain or tree topology, the reset of an upper-level RRU does not affect its lower-level RRU when the reset is caused by reasons other than power-off. These topologies can improve system reliability.

In hybrid topology, one RRU can be connected with two BBUs. This ensures that the services are not affected when one CPRI path is faulty.

Figure 6-1 shows the hybrid topology of the BBUs and RRUs.

Figure 6-1 Hybrid topology of the BBUs and RRUs

The BBUs and RRUs can form a ring network. When unidirectional or bidirectional fault occurs in any node of the ring, the other RRUs are not affected as they support automatic switchover in the ring topology. This enhances system reliability. Figure 6-2 shows the ring topology of BBUs and RRUs.



Figure 6-2 Ring topology of BBUs and RRUs

6.2 Hardware Reliability 6.2.1 Hardware Reliability of the BBU

The BBU has the following features in terms of hardware reliability:

l The BBU has built-in N+1 redundant fans. It can automatically adjust the speed of the fans if the heat dissipation of the system is guaranteed. This helps reduce noise generated by the fans and minimize fan abrasion, and thus improves the life span and reliability of the heat dissipation system. The BBU also supports functions such as fan start, fan shutoff, and fan alarm reporting.

l When one fan in the BBU fails, the system can still operate normally, given the temperature specification for the system is 10°C lower or higher than that specified for the lower threshold or higher threshold, respectively.

l The power supply module prevents the BBU from the damage caused by overcurrent.

l The BBU supports overtemperature protection. l The optical modules of the BBU are hot swappable. l The BBU allows environment check. It can also report related alarms. l The BBU has a mechanism to prevent misinsertion and reverse insertion of the

power input port.



6.2.2 Hardware Reliability of the RRU

Reliability Design for Power Supply The RRU3004 operates within a wide voltage range. In DC power input, the RRU can operate in the range –36 V DC to –57 V DC, which means that the system can run undamaged even the peak voltage reaches –57 V DC.

Over-Temperature Protection When the internal temperature of the RRU is too high due to ambient factors, the system automatically enables the auto protection function to reduce power or to shut down power amplifiers, depending on the severity. When the ambient temperature comes back to normal, the system automatically disables this function.

6.3 Software Reliability The DBS3900 software has a very high error tolerance. The whole system does not break down even if the software fails. This means that the system has the capability of self-healing. The following describes the error tolerance of the BBU and RRU3004 software.

6.3.1 Regular Check on Key Resources Seizure check is conducted on various software resources in the system. If a resource failure occurs due to software faults, the check mechanism can ensure the release of suspended resources and the output of the related logs and alarms.

6.3.2 Parameters Check Software checks all parameters contained in the LMT/OMC commands to ensure their validity. The validity of the data in the data configuration file is also checked when the system is started. This ensures normal operating of the system. When the software is active, any possible fault in the software or hardware is monitored. The detected faults are reported. Task status and system abnormalities can also be monitored.

6.3.3 Software Failure Protection Locally, the base station saves two software releases and data releases. If a fault occurs during the software upgrade, the system automatically rolls back to the previous version. This greatly increases the success rate of software downloading and makes remote maintenance more practical.

6.3.4 Data Check In terms of data check, the system performs the following functions: checking data consistency on a regular or event-driven basis, restoring data consistency selectively or preferably, and outputting related logs and alarms.



6.3.5 Saving Operation Log Information The system records user operations on a regular basis and saves the information as operation logs. The operation logs help you locate problems and restore data.

6.3.6 Backup The system supports backup of the transmission links and the main control board.



7 Technical Specifications

7.1 Radio Specifications Table 7-1 lists the operating frequency bands of the RRU3004.

Table 7-1 Operating frequency bands of the RRU3004

Frequency Band Receive Band Transmit Band

GSM 900 890–915 MHz 935–960 MHz

E-GSM 900 880–915 MHz 925–960 MHz

GSM 1800 1710–1785 MHz 1805–1880 MHz

7.2 Transmit Specifications Table 7-2 lists the output power of the transceiver in the RRU3004.

Table 7-2 Output power of the RRU3004

Operating Band Operating Mode Output Power Per Transceiver(GMSK/8PSK TOC)

GSM 900/ E-GSM 900

Non-combining 30 W/20 W

GSM 900/ E-GSM 900

Combining 15 W/10 W

GSM 1800 Non-combining 20 W/15 W

GSM 1800 Combining 10 W/7.5 W

GSM 900/ E-GSM 900

PBT 40 W/25 W

GSM 1800 PBT 30 W/20W



7.3 Receive Sensitivity Table 7-3 lists the static receive sensitivity of the RRU.

Table 7-3 Receive sensitivity of the RRU

Receive Diversity Mode Static Receive Sensitivity

Single antenna –113 dBm (typical value)

Dual-antenna –116 dBm (typical value)

Four-antenna –118.5 dBm (typical value)

7.4 Dimensions Table 7-4 lists the mechanical dimensions of the DBS3900.

Table 7-4 Mechanical dimensions of the DBS3900

Configuration Type Width (mm) Depth (mm) Height (mm)

BBU3900 442 310 86

RRU3004 (two transceivers, without the rack)

100 356 480

RRU3004 (four transceivers, with the rack)

247 410 556

7.5 Weight Table 7-5 lists the weight of the DBS3900.

Table 7-5 Weight of the DBS3900

Configuration Type Weight (kg)

BBU3900 (Typical) 7

BBU3900 (Max) 12

RRU3004 (two transceivers, without the rack) 15

RRU3004 (four transceivers, with the rack) 38



7.6 Power Supply 7.6.1 Power Input of the BBU

Table 7-6 lists the power input for the BBU.

Table 7-6 Power input for the BBU

Power Type Nominal Value Allowed Range

–48 V DC –48 V DC –38.4 V DC to –57 V DC

+24 V DC +24 V DC +19 V DC to +29 V DC

220 V AC 220 V AC 176 V AC to 280 V AC

Two types of BBU3900 are available in terms of power supply: -48V DC and +24V DC. With a matched power conversion system, the 220 V AC power can be converted into –48 V DC power for the use of the BBU.

7.6.2 Power Input of the RRU Table 7-7 lists the power input for the RRU.

Table 7-7 Power input for the RRU

Power Type Nominal Value Allowed Range

–48 V DC –48 V DC –36 V DC to –57 V DC

220 V AC 220 V AC 176 V AC to 280 V AC

With a matched power conversion system, the 220 V AC power can be converted into –48 V DC power for the use of the RRU.

7.7 Power Consumption Table 7-8 lists the total power consumption of DBS3900 in typical configuration on the site.

Table 7-8 Total power consumption of DBS3900 (RRU3004 configured)

Site Configuration TOC (W) Work Mode Typical Power Consumption (W)

S2/2/2 (900M) 30 No combiner 560

S4/4/4 (900M) 15 Combiner 740

S4/4/4(1800M) 10W Combiner 730



Site Configuration TOC (W) Work Mode Typical Power Consumption (W)

S2/2/2(1800M) 20W No combiner 510

S4/4/4(1800M) 20W No combiner 730

The typical power consumption refers to the measurement value when the traffic is 30%.

7.8 Ports 7.8.1 Transmission Ports on the BBU

Table 7-9 lists the transmission ports onthe BBU.

Table 7-9 Transmission ports on the BBU

Application Port Quantity Data Rate Connector

E1/ T1 1 (4 E1/T1s) E1: 2 Mbit/s T1: 1.5 Mbit/s

DB44 male Abis interface

FE 2 10/100 Mbit/s l RJ45 l SFP socket

Interface between the BBU and the RRU

CPRI 6 1.25 Gbit/s SFP socket

BBU supports 52-route E1/T1 signals or 7-route FE optical(electricity) signals by adding UTRP.

The CPIR interface can use optical port. The multi-mode optical cable can extend up to 500 m and the single-mode optical cable can extend up to 40 km. The CPIR interface can also use electric port with a shielded twisted-pair cable. The bandwidth of the electric port is 1.25 GHz and the distance of the cable extends only to several meters. The electric port is applied when multiple RRUs are assembled or installed together.

7.8.2 External Alarm Ports on the BBU Table 7-10 lists the external alarm ports on the BBU.

Table 7-10 External alarm ports on the BBU

Application Port Quantity Connector

RS485 2 to 4 RJ45 External alarms

Four dry contacts 16 RJ45



Table 7-11 lists the specifications for the external alarm ports of the BBU.

Table 7-11 Specifications for the external alarm ports on the BBU

Parameter Parameter

Closed resistance TBD External alarm input port

Open resistance TBD

7.8.3 Other External Ports on the BBU Table 7-12 lists the other external ports on the BBU.

Table 7-12 Other external ports on the BBU


Power supply –48 V DC 1 3V3 male

GPS signal input - 1 SMA female

BITS clock signal input 1 SMA female Clock signal input/output

13 MHz clock signal output 1 SMA male

Testing - 1 USB connector

Commissioning Serial or Ethernet 1 RJ45

7.8.4 Transmission Port on the RRU Table 7-13 lists the transmission port on the RRU.

Table 7-13 Transmission port on the RRU

Application Quantity Date Rate Connector

CPRI 2 1.2288 Gbit/s SFP (electric/optical)

7.8.5 External Alarm Ports on the RRU Table 7-14 lists the external alarm port on the RRU.



Table 7-14 External alarm port on the RRU

RRU Type Port Quantity Connector

RRU3004 Port providing access of two dry contact alarms

1 DB15 connector

7.8.6 Other External Ports on the RRU Table 7-15 lists the other external ports on the RRU.

Table 7-15 Other external ports on the RRU


Power supply –48 V DC 2 OT

RET communication

AISG 1 DB9

TX/RX duplexing 2 DIN type, round and waterproof

Radio frequency

RRU RX interconnecting

1 DB2W2 connector

7.9 Lightning Protection Specifications

l The surge protection specifications are based on the surge waveform of 8/20 µs. l Unless otherwise specified, the surge current refers to a nominal discharge current.

7.9.1 Lightning Protection Specifications for the BBU Table 7-16 lists the lightning protection specifications for the external ports on the BBU.

Table 7-16 Lightning protection specifications for the external ports on the BBU

Application Lightning Protection Mode Surge Current

Differential mode 2 kA Power supply

Common mode 4 kA

Differential mode 250 A E1

Common mode 250 A




Differential mode (E1 coaxial lightning protection box)

3 kA

Common mode (E1 coaxial lightning protection box)

5 kA

Differential mode (twisted pair lightning protection box)

5 kA

Common mode(twisted pair lightning protection box)

8 kA

Differential mode (GPS lightning protection device)

8 kA GPS signal input

Common mode (GPS lightning protection device)

20 kA

Differential mode Dry contact alarms

Common mode

250 A

7.9.2 Lightning Protection Specifications for the RRU Table 7-17 lists the lightning protection specifications for the external ports on the RRU.

Table 7-17 Lightning protection specifications for the external ports on the RRU


Differential mode 10 kA –48 V DC power supply

Common mode 15 kA

Differential mode 8 kA RF

Common mode 20 kA

Differential mode 3 kA Dry contact alarms

Common mode 5 kA

Differential mode 3 kA RET

Common mode 5 kA



7.10 Operating Environment 7.10.1 Operating Environment of the BBU

Table 7-18 lists the operating environment of the BBU.

Table 7-18 Operating environment of the BBU

Parameter Specification

Temperature -20 to +5℃ 5 ℃

Relative humidity 5% to 95%

7.10.2 Operating Environment of the RRU Table 7-19 lists the operating environment of the RRU.

Table 7-19 Operating environment of the RRU

Parameter Specification

Temperature –40°C to +50°C (without solar radiation) –40°C to +45°C (with solar radiation)

Relative humidity 5% to 100%

Absolute humidity 1 g/m3 to 30 g/m3

Air pressure 70 kPa to 106 kPa

7.11 EMC The DBS3900 meet the electromagnetic compatibility (EMC) requirements in compliance with the following standards:

l R&TTE Directive 99/5/EC l 3GPP TS 25.113 V4.4.0 (2002-12) l ETSI EN 301 489-1 V1.5.1 (2004-11) l ETSI EN 301 908-1 V2.2.1 (2003-10) l ITU-T SM 329-10(2003) l FCC PART15



7.12 Acoustic Noise The Sound Power Level (SPL) of acoustic noise generated by the BBU is lower than 45 dBA as stipulated in ETS300 753.

The RRU works silently.

7.13 Storage Environment The DBS3900 comply with the following standard in terms of storage environment:

l ETSI EN 300 019-1-1 V2.1.4 (2003-04) Class 1.2: “Weatherprotected, not temperature-controlled storage locations”

7.14 Transportation Environment The DBS 3900 comply with the following standard in terms of transportation environment:

l ETSI EN 300019-1-2 V2.1.4 (2003-04) Class 2.3: “Public transportation”

7.15 Anti-Seismic Protection The BBU complies with the following standard in terms of anti-seismic protection:

l IEC 60068-2-57 (1999-11)

The DBS3900 comply with the following standard in terms of anti-seismic protection:

l NEBS GR63 zone4

7.16 Operating Requirements The BBU complies with the following standard in terms of operating requirements:

l ETSI EN 300019-1-3 V2.2.2 (2004-07) Class 3.1: “Temperature-controlled locations”

The RRU complies with the following standard in terms of operating requirements:

l 3G TS25.141 V3.0.0 l ETSI EN 300019-1-4 V2.1.2 (2003-04) Class 4.1: “Non-weatherprotected

locations”



8 Installation

The hardware and software of the functional modules of the DBS3900 are debugged before delivery to the site. Field installation personnel only need to fix the installation kits, install the relevant modules, and connect the external cables. After the data configuration file is downloaded locally or remotely, the base station can operate.

l The BBU can be mounted on the wall, or installed in the cabinet or rack that has enough

spare space, such as the 19-inch indoor cabinet or rack, outdoor macro base station, RRU3004 rack, OFB, or APM.

l The compact and light RRU can be installed on the concrete pole, the stayed tower, the stand, or the building wall.

l The BBU and RRU can be powered with –48 V DC input and installed outdoor without equipment room or air conditioner. This meets the economical and speedy deployment.

l The external cabling ports of the BBU and RRU are located on the front panel and at the bottom with silkscreen attached. This makes cabling easy.

Huawei provides all necessary auxiliary devices for the DBS3900, such as AFB, outdoor SPD, APM, and EPS4815A power conversion module This package solution covers the power distribution, lightning protection, transmission cabling, installation of transmission equipment, and power backup for the DBS3900.

The DBS3900 supports automatic setup of the default maintenance channel.

The maintenance personnel only need to start the automatic setup of the default maintenance channel remotely after the hardware installation. The BSC then can set up a maintenance channel with the DBS3900 based on some default parameters. Thus, you can load data and program to the DBS3900 on the BSC side. This feature improves the system maintainability.

The fast and easy installation of hardware and software significantly decrease the time for deploying the base stations.



A Technical Standards

A.1 EMC (Electromagnetic Compatibility) Standards The EMC standards are as follows:

l R&Directive 99/5/EC l 3GPP TS 25.113 V4.4.0 (2002-12) l ETSI EN 301 489-1 V1.5.1 (2004-11) l ETSI EN 301 908-1 V2.2.1 (2003-10) l ITU-T SM 329-10(2003) l FCC PART15

A.2 Acoustic Noise Standards The acoustic noise standards are as follows:

l The Sound Power Level (SPL) of acoustic noise produced by the operating BBU is lower than 45 dBA as specified in the ETS300 753 standard.

l The RRU operates quietly.

A.3 Storage Environment The DBS3900 complies with the following standard in terms of the storage environment:

ETSI EN 300019-1-1 V2.1.4 (2003-04) Class 1.2: "Weatherprotected, not temperature-controlled storage locations"

A.4 Transportation Environment The DBS3900 complies with the following standard in terms of the transportation environment:

ETSI EN 300019-1-2 V2.1.4 (2003-04) Class 2.3: “Public transportation”

A.5 Working Environment l The BBU complies with the following standard in terms of the working

environment:



− ETSI EN 300019-1-3 V2.2.2 (2004-07) Class 3.1: "Temperature-controlled locations"

l The RRU complies with the following standard in terms of the working environment: − 3G TS25.141 V3.0.0 − ETSI EN 300019-1-4 V2.1.2 (2003-04) Class 4.1: "Non-weatherprotected

locations"

A.6 Anti-Seismic Performance

l The anti-seismic performance of the BBU complies with the IEC 60068-2-57 (1999-11)

l The anti-seismic performance of the RRU complies with the NEBS GR63 zone4



B Glossary

B

Baseband Baseband is a form of modulation in which the information is applied directly onto the physical transmission medium.

Base Transceiver Station

A Base Transceiver Station terminates the radio interface. It allows transmission of traffic and signaling across the air interface. The BTS includes the baseband processing, radio equipment, and the antenna.

C

Carrier A sine wave, whose bandwidth is much higher than the bandwidth of a signal and, which can be identified by amplitude, frequency, and phase.

H

Handover The transfer of a user’s connection from one radio channel to another (can be the same or different cell).

R

Receive diversity

The most common type of diversity, where a mobile device uses two physically separate antennas to combine signals from the two antennas to reduce the impact of spatial variations in signal strength and thus increase the average data rate available - sometimes dramatically.

T

TMA A Tower Mounted Amplifier (TMA) is a lower noise amplifier installed close to the antenna.



C Acronyms and Abbreviations

A

AMR Adaptive MultiRate

B

BBU Base Band Unit

BSC Base Station Controller

C

CBUS Control BUS

D

DAFM Antenna Front-end Module for DTRU BTS

DBUS Data BUS

DCDU Direct Current Distribution Unit

DDPU Dual Duplexer Module for DTRU BTS

DPMU Power and Environment Monitoring Unit

DTRU Double Transceivers Digital and Radio Frequency Module

DRFU Double Radio Filter Unit

E

EDGE Enhanced Data rates for GSM Evolution

EFR Enhanced full rate speech codec

EGPRS Enhanced GPRS

EMI External Machine Interface



F

FMUA Fan Environment Monitor

FR Frame Relay

G

GATM GSM Antenna and TMA Control module

GMSK Gaussian Minimum Shift-frequency Keying

GPRS General Packet Radio Service

GSM Global System for Mobile communications

H

HR Half Rate

M

MMI man-machine interactive

O

OMC Operation and Maintenance Center

P

PSU Power Supply Unit

R

RF Radio Frequency

RH Relative Humidity

S

SDH Synchronous Digital Hierarchy

T

TCH Traffic Channel

TMA Tower Mounted Amplifier

Documents

Bts Micro Ibs Dbs3900