Owb005400 Dbs3900 Wcdma v200r011 Product Description Issue 1

WCDMA DBS3900 Hardware Structure

Confidential Information of Huawei. No Spreading Without Permission







1.”NodeB Product Description”

This document describes the NodeB product in terms of product positioning,

software and hardware structure, configuration type, signal flow, clock

synchronization, and topology. This document also provides technical

specifications of the NodeB, such as capacity, RF, engineering, surge protection,

and physical ports.

2.” BBU3900 WCDMA User Guide”

This document describes the BBU3900 WCDMA hardware, such as boards, module,

ports, cables, and connectors, and the functions and installation of the hardware,

providing a reference for planning and deploying BBU3900 WCDMA sites. It also

presents the installation modes and maintenance information of the BBU3900

WCDMA.

3.” RRU3804 User Guide”

This document describes the RRU hardware and provides instructions in hardware

installation, cable connections, hardware installation check, and hardware

maintenance. This document is applicable to RRU3804.





In UMTS network, NodeB connect to RNC in uplink and connect to UE in downlink.

In the protocol structure of Uu interface, NodeB implement the function of physical layer.



Units and Auxiliary Devices of the 3900 Series NodeBs



The DBS3900 is characterized by separate baseband and RF modules and distributed

installation, which facilitates transportation, configuration, and installation.

The BBU3900 of the distributed NodeB is characterized by a small footprint, easy

installation, and low power consumption. In addition, the BBU3900 can be placed in the

spare space of an existing site.

The RRU, small and light. Working in natural heat dissipation mode, the RRU has no fans.

The high reliability of the RRU reduces the routine maintenance cost, and it can be

installed close to the antenna to decrease feeder loss and improve system coverage

According to different processing capabilities, the RRU is classified into two types: the

RRU3801C and the RRU3804.



The 2-way receiver sensitivity is higher than –129.3 dBm without TMA

RRU3804 or RRU supports the 4-carrier configuration. When the NodeB evolves from 1x1

to 1x4 or from 3x1 to 3x4, no extra RRU or RRU is required.

The ATM and IP dual stack is supported to protect operators' early investment in ATM

transport.

The NodeB allows UEs to move in a cell at the velocity of up to 400 km/h. The UEs can

enjoy services in the high-speed vehicles such as express trains or maglev trains.

When the chain topology is applied to the RRUs, a maximum of eight cascading levels at

2.5 Gbit/s CPRI interface and four cascading levels at 1.25 Gbit/s CPRI interface can be

supported if one RRU supports one 2-way RX/1-way TX cell.

Frequency supported by BBU3900+RRU3801C

Band Ⅰ（2100MHz） 1920～1980 2110～2170

Band Ⅱ（1900MHz） 1850～1910 1930～1990

Band Ⅸ(1800MHz) 1749.9～1784.9 1844.9～1879.9

Band Ⅳ（AWS） 1710～1755 2110～2155

Band Ⅴ/Ⅵ（850MHz）824～849 869～894

Band Ⅷ(900MHz) 880～915 925～960

Frequency supported by BBU3900+RRU3804

Band Ⅰ（2100MHz） 1920～1980 2110～2170

Band Ⅱ（1900MHz） 1850～1910 1930～1990

Band Ⅳ（AWS） 1710～1755 2110～2155

Band Ⅴ/Ⅵ（850MHz） 824～849 869～894



The BBU3900 and transmission device can be installed in the APM, and the RRU can be

installed on a metal pole close to the antenna.

The APM offers installation space and outdoor protection to the BBU3900, supplies -48 V

DC power to the BBU3900 and RRU, and provides functions such as battery management,

monitoring, and surge protection.

Power Supply Unit (PSU) Power Distribution Unit (PDU)

Power Monitoring Unit (PMU) APM Power unit Interface Board (APMI)



The BBU3900 and the RRU can share the power backup system, transmission system, and

antenna system of the base station in the 2G network. In this way, operators can launch

3G services on the running 2G network at a very low cost.



If the AC power is used, the mini cabinet must be configured with an EPS30-4815A and an SPD (AC); if the DC power is used, the mini cabinet must be configured with a DC power distribution box







The mandatory boards and module are the WMPT, WBBP, UBFA, and UPEU. The optional boards are UTRP and UEIU, UELP, UFLP.

WMPT Board : the WCDMA Main Processing and Transmission unit

It is the BBU3900 main control and transmission board that processes the signals and manages the resources for other boards.

WBBP Board : the WCDMA Baseband Process Unit

The WBBP processes baseband signals.

UTRP Board : the Universal Transmission Processing unit

It is a transmission extension board of the BBU3900 and provides eight E1s/T1s or one unchannelized STM-1/OC-3 or 2 Optical GE ports or 4 electrical FE/GE ports.

UBFA Module : the Universal BBU Fan Unit Type A

The UBFA controls the fan speed and detects the temperature of the fan board.

UEIU Board : the Universal Environment Interface Unit

The UEIU transmits monitoring signals and alarm signals from external devices to the main control board.

UELP Board : the Universal E1/T1 Lightning Protection

The UELP is optionally installed in the SLPU or BBU. Each UELP provides surge protection for four E1s/T1s.

UFLP Board : the universal FE lightning protection (UFLP)

The board is optionally installed in the SLPU or BBU3900. Each UFLP supports 2-way FE surge protection.

UPEU Board : the Universal Power and Environment Interface Unit

It is a mandatory board of the BBU that converts -48 V or +24 V DC to +12 V DC.



The BBU3900 has the following functions.

Providing ports for data communication between the NodeB and the RNC .

Providing the CPRI interface for communication between the BBU and the RRU or

the RFU.

Providing USB ports, one of which facilitates automatic NodeB upgraded when a

USB disk is inserted during software installation and data configuration.

Providing OM channels between the BBU and the LMT or the M2000 to operate

and maintain the BBU.

Processing uplink and downlink baseband signals.

Managing the entire NodeB system in terms of OM and signaling processing.

Providing the system clock.



Slot of the BBU3900

The installation slots of WMPT are 6th or 7th slot, supporting cold backup

A single WMPT is preferentially configured in Slot 7.







The WMPT has two DIP switches: SW1 for setting the E1/T1 working mode and SW2 for

setting the protection grounding for the E1/T1 cables receiving 4-way signals.

All the DIP bits of SW2 are set to OFF by default. When four E1 links are faulty, you should

set all the DIP bits of SW2 to ON so that the faults are rectified.



Slot of the BBU3900

The installation slots of WBBP are 0th to 5th slot. The WBBP that connect to the RRU

should be inserted to the 2th or 3th slot.







Slot of the BBU3900

The installation slots of UTRP are 0th to 5th slot.



There is no DIP switch on the UTRP2, UTRP6 and UTRP9.

The UTRP3 or UTRP4 has three DIP switches numbered from SW1 to SW3.

SW1 and SW2 are used to set the grounding status of the eight E1s. SW3 is used

to set matched impedance for the eight E1s.

SW1 and SW2 are set to OFF (balanced mode) by default. When the eight E1s are

faulty, all the DIP bits of SW1 and SW2 should be set to ON to rectify faults. SW1

corresponds to E1s No.4 to No.7 and SW2 corresponds to E1s No.0 to No.3.



Slot of the BBU3900



Slot of the BBU3900

The installation slots of UTRP are PWR1 and PWR2. Maximum board number: 2





The UEIU is a monitoring and dry contact extension board for the UPEU.

slot of the BBU3900

The UEIU can be configured to PWR1 or PWR2.

The UEIU is preferentially configured in PWR1.









Ports on the panel of the UELP

DIP switch on the UELP

LabelPort

Type

Qua

ntity

Connecto

r TypeDescription

INSIDEDB2

51

DB25

connector

If the BBU3900 is not configured with the

UTRP, the INSIDE port is connected to the

E1/T1 port on the WMPT.

If the BBU3900 is configured with the UTRP

that has the E1/T1 sub-board, the INSIDE

port is connected to:

•E1/T1 port on the E1/T1 sub-board

•E1/T1 port on the WMPT

OUTSIDEDB2

61

DB26

connector

Connected to the E1/T1 transmission port on

the user device

Switch DIP Status Description

1 2 3 4

S1 ON ON ON ON Used for the 75-ohm unbalanced mode

OFF OFF OFF OFF Used for other modes except the 75-

ohm unbalanced mode



Ports on the panel of the UFLP

Port Location Port Quantity Connector Type

INSIDE side FE0, FE1 2 RJ45

OUTSIDE side FE0, FE1 2 RJ45





Interface Module

The functions of the interface module are as follows:

Receiving downlink baseband data from the BBU

Transmitting uplink baseband data to the BBU

Forwarding data from the cascaded RRUs

TRX

The TRX has two RX channels and one TX channel for RF signals.

The RX channels perform the following functions:

Down-conversion of the received signals to IF signals

Amplification of the IF signals

Analog-to-digital conversion

Digital down-conversion

Matched filtering

Digital Automatic Gain Control (DAGC)

The TX channel performs the following functions:

Shaping and filtering of downlink spread spectrum signals

Digital-to-analog conversion

Up-conversion of the IF signals to the TX band

PA

The PA adopts the DPD and A-Doherty technologies to amplify low-power RF signals from the TRX.

Filter

The filters consist of a duplex filter and an RX filter. The filter performs the following functions:

The duplex filter multiplexes one RX and one TX signals over RF channels so that they can share one antenna channel. In addition, it filters RX and TX signals.

The RX filter filters one RX signal.

LNA

The LNA amplifies the signals received from the antenna system.

Power Module

The power module supplies power to other modules of the RRU.





The RRU3801C, RRU3804, and RRU3801E have similar panel and distribution of ports.



The ports of the RRU are located at the bottom of the module and in the cabling cavity.

The RRU has the following ports:

Grounding ports

Power supply sockets

Transmission ports

Alarm ports









Star Topology

The star topology is the most common topology and is applicable to densely

populated areas.

Advantages:

The NodeB is directly connected to the RNC. Therefore, the star topology

features easy maintenance, engineering, and capacity expansion.

Direct data transmission is implemented between the NodeB and the RNC,

reducing the number of nodes that signals travel through and enhancing

transmission reliability.

Chain Topology

The chain topology is applicable to belt-shaped and sparsely populated areas, such

as areas along highways and railways.

Advantages:

The chain topology can reduce costs in transmission devices, engineering,

construction, and transmission link lease.

Tree Topology

The tree topology applies to areas in which the network structure, site distribution,

and subscriber distribution are complicated, for example, hot spot areas in which

subscribers are widely distributed.

Advantages:

The tree topology requires fewer transmission links than the star topology.



The microwave topology is a typical hub topology and the most important hub scenario.

Convergence devices, such as the hub NodeB or transmission gateway, can be placed at

the cross points of each tree topology. Typically, the hub NodeB is used for the first-level

convergence. Based on capacity requirements, the hub NodeB or the transmission gateway

can be used for the second-level convergence.



When the chain topology is applied between the BBU3900 and the RRUs, a maximum of

eight cascading levels at 2.5 Gbit/s and four cascading levels at 1.25 Gbit/s can be

supported if one RRU supports one 2-way RX/1-way TX cell.



Capacity expansion can be implemented through module addition or license upgrade.

When license upgrade is required, the capacity can be expanded by 16 cells at a time.

During the early stage of network deployment, you can use configurations of small

capacity such as 3 x 1. Along with the increase in the number of UEs, you can upgrade the

system to a larger capacity configuration such as 3 x 2 and 3 x 4.









Documents

Owb005400 Dbs3900 Wcdma v200r011 Product Description Issue 1