PowerPoint All rights reserved
DBS3800 is a distributed NodeB solution put forward by Huawei
Technologies Co.Ltd.
In this slide, we’ll mainly introduce the hardware system
structure, application scenarios, basic functions of modules and
networking and configuration of the DBS3800
HUAWEI TECHNOLOGIES CO., LTD.
Upon completion of this course, you will be able to:
Application Scenarios of DBS3800
Hardware Structure of DBS3800
Functions of Different Modules
Networking and Configuration Examples
HUAWEI TECHNOLOGIES CO., LTD.
DBS3800 system consists of:
Grounding cable
+24V/-48V DC
Power cable
The DBS3800 distributed NodeB solution put forward by Huawei
Technologies Co.,Ltd.
The DBS3800 consists of two types of modules below:
Baseband unit (BBU): processes baseband signals
Remote radio unit (RRU): processes RF signals
The BBU connects to one or more RRUs through electrical or optical
interfaces, forming the structure of a distributed NodeB.
The outdoor RRU can be mounted close to the antenna on a metal pole
or a wall. The RRU enjoys small dimensioning, lightweight, and easy
installation.
BBU comes in two types below:
Indoor BBU
The indoor BBU is a small-sized cassette. You can mount the BBU in
any standard cabinet with free space that is 19 inches wide and 1 U
high. The BBU requires smaller floor space and features easier
installation, a complete set of functions, lower power consumption,
and ease in co-location with the existing site.
The operator may expand system capacity by stacking BBUs in the
same site. The indoor BBU and RRUs are installed with the baseband
unit and RF units separated to form a distributed NodeB
architecture.
Outdoor BBU
The outdoor BBU looks the same as the RRU.
The BTS3801C, a micro NodeB, can be formed by mounting one outdoor
BBU and one RRU in a small cabinet. The BTS3803C, another model of
micro NodeB, can be formed by installing one outdoor BBU and three
RRUs in a small cabinet.
The micro NodeB incorporating the outdoor BBU and the RRU serves as
a supplementary solution for the indoor BBU+RRU distributed NodeB
applications.
HUAWEI TECHNOLOGIES CO., LTD.
RRU can be installed near antenna
The numbers of BBU and RRU can be configured according to different
requirements
Traditional outdoor macro NodeB
Require long feeder
2.8.1 BBU3806 features easy installation as follows:
BBU3806 is a standard-sized cassette that is 19 inches wide and 1U
high. It is small, light and easy to mount. BBU3806 can reduce
operating costs during its entire life cycle, thus allowing the
operator to deploy the network at a lower cost and faster
speed.
The operator can mount BBU3806 in a 19-inch indoor cabinet or a
rack with spare space. No extra space is required.
BBU3806 and existing 2G equipment can form a multi-standard site.
This allows the operator to fully utilize free space in existing
facilities and to cut site rent.
BBU3806 supports wall installation.
2.8.2 BBU3806C Installation Features
BBU3806C together with RRU3801C can be installed in a small cabinet
t save space.
BBU3806C can be used in outdoor environments. No equipment room or
air conditioner is required. Therefore, a BBU3806C can be mounted
quickly with lower cost.
BBU3806C with cables led out from its bottom facilitates cable
connections to RRU3801C.
BBU3806C enjoys easy installation. You may install or pull out the
BBU3806C with the front handle.
2.8.3 RRU3801C Installation Features
RRU3801C is small and light, and can be mounted on a prefabricated
pole, stayed tower or wall. No special tower is required.
RRU3801C supports multiple installation modes, and can be mounted
on a pole, a wall, a stand, or next to 2G equipment. The operator
can also select other modes as required by actual situations.
RRU3801C can be used in outdoor environments. No equipment room or
air conditioner is required. Therefore, a RRU3801C can be mounted
quickly with lower cost.
RRU3801C together with BBU3806C can be installed in a small cabinet
to save space.
Cables are led out from the RRU3801C bottom. The operator can mount
multiple modules into a RRU3801C in parallel or mount RRU3801Cs in
separated locations.
When mounting RRU3801Cs in parallel, the operator can pull out or
insert the modules inside the RRU3801C with a handle. When mounting
the RRU3801C with a single module, the operator can handle it with
both hands to make installation easy.
HUAWEI TECHNOLOGIES CO., LTD.
Launch 3G services on the basis of a 2G site
I. Site Requirements
To launch 3G services on the basis of a 2G site, the operator shall
make sure:
There is the 2G outdoor macro BTS in the existing site.
There is free space in the 2G BTS.
The 3G NodeB does not need large outdoor space.
The 3G NodeB can share the antenna and feeder system with the
existing 2G equipment.
II. Application Scenario
This application enables the operator to place the BBU3806 inside
the transmission equipment cabin of the existing 2G outdoor BTS.
The operator can mount the RRU3801C on a metal pole, a stand, or
next to the 2G outdoor BTS.
With this solution, the operator can obtain the following
benefits:
The operator can make full use of the existing 2G outdoor macro
BTS.
This solution features easier site acquisition, rent saving, and
fast and economical network deployment.
The BBU3806 supports nominal power input and the Fractional ATM
technique.
In this sense, the BBU3806 can share the power backup and
transmission systems with the existing 2G BTS.
The BBU3806 can share the antenna and feeder system with 2G
equipment.
In one word, this solution helps the operator to launch 3G services
on the basis of the existing 2G network at much lower cost.
HUAWEI TECHNOLOGIES CO., LTD.
Launch a new 3G outdoor site without an equipment room
I. Site Requirements
To launch a new 3G outdoor site, the operator shall make sure that
the 3G NodeB
allows outdoor installation.
II. Application Scenario
Table 1-2 lists three solutions to meet site requirements in this
scenario.
Figure 1-2 shows the distributed NodeB in application scenario 2,
taking APM +BBU3806 + RRU3801C as an example.
HUAWEI TECHNOLOGIES CO., LTD.
Application scenario 3:
Launch a new 3G indoor site, there is an equipment room but the
space is limited and load-bearing capacity is week
I. Site Requirements
To launch a new 3G indoor site, the operator shall ensure an
independent site or indoor space. The problem is that the equipment
room with limited space is weak in load-bearing capacity and lies
in a bad location.
II. Application Scenario
Depending on conditions of the existing equipment room, the
operator can mount the BBU3806 on a wall or a BTS cabinet with free
space of 19 inches. The RRU3801C is mounted close to the
antenna.
HUAWEI TECHNOLOGIES CO., LTD.
Application scenario 4
Launching a new 3G outdoor site, the operator has no equipment room
or fiber resources, or it is very hard to route optical
fibers
I. Site Requirements
When launching a new 2G outdoor site, the operator has no equipment
room or fiber resources, or meets hard troubles in routing optical
fibers.
II. Application Scenario
The operator can select a 3G micro NodeB, either a BTS3801C or a
BTS3803C.
The two types of micro NodeB enjoy small size, light weight, and
flexibility in installation. Both pose low requirement for floor
space and load-bearing capacity. The BTS3801C and the BTS3803C
allow flexible configuration. Depending on required sectors, the
operator can get multiple configurations from 1 sector to 3
sectors.
HUAWEI TECHNOLOGIES CO., LTD.
supports positioning services
Supports high-speed downlink packet access (HSDPA) technology
HSDPA allows the traffic at up to 14.4 Mbps for a single cell
HDSPA enables a single cell to support 15 OVSF codes
Supports RRU cascading
The maximum distance between two RRUs is 40km
The distance from the first one to the last one should be within
100km
When using the 1.25 G optical module, cascading levels is less than
4
When using the 2.5 G optical module, cascading levels is less than
8
HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI TECHNOLOGIES CO., LTD.
Weight
3kg
15kg
Transport subsystem;
Baseband subsystem;
Control subsystem;
Interface module
In addition, there are fans and power supply modules inside
BBU.
The following subsections mainly describe these subsystems.
3.2.2 Transport Subsystem
Physical interfaces from BBU to RNC for data communication;
IPoA channels between BBU and LMT/M2000 for BBU operation and
maintenance;
SAAL channels between BBU and RNC for signaling processing
3.2.3 Baseband Subsystem
The baseband subsystem processes both UL and DL baseband
signals.
1) UL baseband signal processing module: consists of demodulation
unit and decoding unit. Before sending UL baseband signals to RNC
through the transport subsystem, the module processes them as
follows:
UL baseband signals are processed into despread soft decision
symbols after access channel searching, access channel
demodulation, and dedicated channel demodulation.
The signals are further sent to RNC through the transport subsystem
after decoding and FP processing.
2) DL baseband signal processing module: consists of modulation
unit and coding unit. Before sending signals received from the
transport subsystem to the optical module, the module process them
as follows:
The module sends service data received from the transport subsystem
to the frame protocol (FP) module.
After FP processing, the module further processes the signals
through transmission channel mapping, physical channel generation,
framing, spreading, demodulating, transmit diversity control, and
power control combination.
The module finally sends the processed signals to the interface
module.
3.2.4 Control Subsystem
The control subsystem controls the entire distributed NodeB system.
It performs operation and maintenance functions, processes various
types of signaling, and provides system timing.
1) Operation and maintenance
Access link control application part (ALCAP) processing;
Logical resources management
Providing phase-locked Iub interface timing;
Providing GPS timing;
Providing system timing as required by the NodeB
3.2.5 Interface Module
The interface module has the following functions:
Providing three small form-factor pluggable (SFP)
optical/electrical interfaces to receive UL baseband data from
RRU3801C and transmit DL baseband data to the RRU3801C in
accordance with CPRI protocols;
Providing two SCSI electrical interfaces to share synchronization
information, baseband data, power control information and
transmission data among BBUs.
HUAWEI TECHNOLOGIES CO., LTD.
DIP switch
The EIa interface uses the MDR36 Mini DSUB electrical port to
achieve high-speed interconnection between BBU3806s. Signals
transmitted over the EIa interface include three 2-way high-speed
electrical signals at 2.5 Gbit/s and timing signals, enabling
timing synchronization and active/standby switchover between the
active BBU3806 and its redundant.
The EIb interface uses the MDR36 Mini DSUB electrical port to
achieve high-speed interconnection between the active BBU3806 and
its standby
BBU3806 or between the redundant BBU3806 and its standby BBU3806.
signals transmitted over the EIb interface include three 2-way
high-speed electrical signals at 2.5 Gbit/s and 8 KHz timing
signals, enabling timing synchronization between active/standby
BBU3806s or redundant/standby BBU3806s.
HUAWEI TECHNOLOGIES CO., LTD.
CPRI (optical port or electrical port)
3
Interface between BBUs
HUAWEI TECHNOLOGIES CO., LTD.
Flashing fast at 1Hz
The BBU is loading
Off
There is no power input or the BBU is faulty
ALM
red
Off
On
ACT
green
On
Off
The BBU doesn’t work or it is standby or secondary
LIU0LIU7
The link isn’t used or there’s no alarm
On
On
The power of the signal received from the near end is not
enough
Flashing
HUAWEI TECHNOLOGIES CO., LTD.
Weight
Power
-48V DC
Power Consumption
20WPower amplifier
High-speed interface module
Multi-carrier transceiver (MTRX)
Power amplifier (PA)
3.3.2 High-Speed Module
RRU3801C provides interfaces to receive DL baseband data from its
upper-level equipment such as BBU3806 or macro NodeB, to transmit
UL baseband data to the upper-level equipment, and to transfer the
data from a cascaded RRU3801C.
3.3.3 MTRX
The Rx channel performs:
Down converting the receive signals to intermediate frequency (IF)
signals
Amplifying signals
Analog-to-digital converting
The Tx channel performs:
Digital-to-analog converting
3.3.4 Power Amplifier
The power amplifier amplifies the small RF signals from the
MTRX.
3.3.5 Duplexer
Receiving signal multiplexing and transmit signal multiplexing.
This enables the receive signals and the transmit signals to share
the same antenna channel.
Receiving signal filtering and transmit signal filtering
3.3.6 LNA
HUAWEI TECHNOLOGIES CO., LTD.
RRU3801C Panel
DIP Switchused to indicate the slot Number of RRU3801C, not used
yet
Maintenance Panel
Bottom Panel
Distributed Board
Flashing fast at1Hz
On
Off
There is no power input or the BBU is faulty
ALM
Red
Off
On
TX_ACT/VSWR
Green flashing slowly at 0.5Hz
Power amplifier isn’t workingboard is running
Red is On
Power amplifier is working there’s VSWR alarming on ANT_TX/RXA
port
Red flashing slowly at 1Hz
Power amplifier is turned offand there’s VSWR alarming before it is
turned off
HUAWEI TECHNOLOGIES CO., LTD.
Being tested
On
The power of the receiving signal on west port is too weak
Flashing slowly at 0.5Hz
CPRI_E
Green
Off
On
The power of the receiving signal on east port is too weak
Flashing slowly at 0.5Hz
HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI TECHNOLOGIES CO., LTD.
One BTS3801C is constituted by one BBU3806C and one RRU3801C
HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI TECHNOLOGIES CO., LTD.
Networking
BBUs and RNC can form multiple networking modes such as star,
chain, tree, ring, and hybrid
For both chain and tree networking modes:
cascading levels is less than 5
The BBUs in the ring topology require additional transmission
equipment.
HUAWEI TECHNOLOGIES CO., LTD.
Networking
BBUs and RRUs can form multiple networking modes such as star,
chain, tree, ring, and hybrid
For both chain and tree networking modes:
When using the 1.25 G optical module, cascading levels is less than
4
When using the 2.5 G optical module, cascading levels is less than
8
HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com