3g bbu & rru

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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
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.
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.
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.
Launch a new 3G outdoor site without an equipment room
To launch a new 3G outdoor site, the operator shall make sure that the 3G NodeB
allows outdoor installation.
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.
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
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.
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.
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
When launching a new 2G outdoor site, the operator has no equipment room or fiber resources, or meets hard troubles in routing optical fibers.
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.
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
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.
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.
CPRI (optical port or electrical port)
3
Interface between BBUs
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
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
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
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
One BTS3801C is constituted by one BBU3806C and one RRU3801C
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.
Networking
BBUs and RRUs can form multiple networking modes such as star, chain, tree, ring, and hybrid
For both chain and tree networking modes:
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