Huawei DBS3900 V300R008 Technical specifications

Product Description
DBS3900
V300R008
Issue 04
Date 2008-06-11
HUAWEI TECHNOLOGIES CO., LTD.

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Product Description
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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.

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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.

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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

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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

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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

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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

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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.

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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.

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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

Indoors

It can be mounted on the wall, or installed in the 19-inch cabinet or
rack, RRU3004 rack, APM, or OFB.
RRU

Indoors/outdoors

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.

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1.2.1 Fast Network Deployment
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.
The distributed installation facilitates transportation and thus meets the
economical and speedy network deployment.
1.2.2 Low Costs
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.
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
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.
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.

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2 Features of the DBS3900
2.1 Coverage Capability
The DBS3900 has the following benefits in terms of coverage:
The RRU3004 supports the cascading of three RRU modules. One RRU module
can be placed 40 km away from the BBU.
High receive sensitivity: The static sensitivity of the TCH/FS is -113 dBm (typical
value in normal temperature).
Power Boost Technology (PBT) is supported by RRU3004.
The maximum output power (TOC) of the RRU3004 can reach up to 40 W (900M)
or 30 W (1800M).
A maximum of 12 cells can be configured and multi-band networking is
supported.
Antenna hopping and transmit diversity are supported.
2.2 Capacity
One RRU3004 provides two transceivers and two assembled RRU3004s provide
four transceivers.
72 transceivers are supported by BBU3900.
Abis over IP is available.
2.3 Networking Capability
E1/T1, FE optical, microwave and satellite transmission are supported.
Star, tree, chain, ring, and hybrid topologies are supported.
Flex Abis networking is supported.
The GSM and UMTS can share the BBU3900.
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.

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2.4 Clock and Synchronization
When the synchronization clock operates in free-run mode, the system can
operate normally for at less than 7 days in succession.
Software synchronization mode is supported.
Phase-locked, fast pull-in, and holdover functions, as well as free run mode, are
supported.
Synchronization with the clock extracted from the Abis interface (default) is
supported.
Synchronization with the Global Positioning System (GPS) equipment is
supported.
Synchronization with the external 2 MHz BITS clock is supported.
2.5 Multi-Band Application
The RRU3004 can operate over the 1800 MHz and 900 MHz bands.
2.6 Antenna
The antenna has the following features:
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.
Dual polarization antenna is supported to reduce the number of antennas in the
cells.
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).

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2.7 Installation
2.7.1 Installation of the BBU
The BBU has the following installation features:
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.
It can be installed in a 19-inch standard cabinet or the RRU3004 rack, or mounted
on the wall or stand without extra space.
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:
The RRU is small and light, and does not have strict requirements for bearing
capability.
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.
It can be mounted outdoors without equipment room or air conditioner. This
meets the economical and speedy deployment.
As the cables for the RRU are led out from its bottom, multiple RRU modules can
be installed in parallel or separately.
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:
Working temperature range: –20°C to + 55°C. The BBU is functional within the
working temperature range.
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).
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:

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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.
The operation temperature of the RRU ranges from –40°C to +50°C.
The RRU is functional within a wide operating voltage range from –36 V DC to
–57 V DC (rated voltage of –48 V DC).
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:
Local maintenance, remote maintenance and centralized network management
are supported.
The RRU supports the topology scanning function. The changes in topology
structure are automatically monitored by the system so that manual operations
are reduced.
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.
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
A maximum of two BBUs can be connected to expand the capacity. They are
connected through high-speed electrical ports.
Cassette-shaped BBU facilitates capacity expansion and installation.
One RRU3004 rack can be configured with two RRU3004 modules, enabling
4-way receive diversity.
The RRUs can be cascaded to enable capacity expansion.
2.11.2 Evolution
The DBS3900 supports the smooth evolution to the GERAN and LTE.

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

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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
Site
maintenance
terminal
Central processing unit
High-speed
interface unit
BTS interface unit
Clock unit
BSC
MMI
Abis
Maintenance
path
RRU
Control path
Service
data path CPRI
BBU
Monitoring unit
Environment
monitoring bus
Boolean alarm input
Timing Frame
number
and clock
External
synchronization clock
As shown in Figure 3-1, the BBU consists of the following functional modules:
BTS Interface Unit
Central Processing Unit
High-Speed Interface Unit

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Clock Unit
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:
Connects the BTS to the BSC
Exchanges timeslot data between the E1 links and the DBUS
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.
Supports the UART and HDLC communication protocols
Controls the BTS interface unit and communicates with the BSC and BTS
Controls the RF interface unit and communicates with the RRU
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:
Receives uplink baseband data from the RRU.
Transmits downlink baseband data to the RRU.
Each BBU provides six SFP optical ports.
3.1.5 Clock Unit
The clock unit performs the following functions:
Provides high-precision clock source for the BTS and provides system clock
based on this clock source
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.

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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
Processin
g unit for
TX signals
Processin
g unit for
RX
signals
Control
module
DAC
DAC
ADC
ADC
PA
PA
LOAD
LNA
LNA
BBU
BBU/
RRU
Duplexer
TX1
RX1
TX2
RX2
RXD_IN
RXM_OUT
Optical
interface
Antenna
system
Carrier detection
Signal
processing
CMD
As shown in Figure 3-2, the RRU consists of the following modules:
High-speed interface module
Signaling processing unit
Power Amplifier (PA)
Dual Duplexer
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:
Receives the DL data from the upper-level equipment (BBU).
Sends UL data to the upper-level equipment (BBU).
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.