NodeB Hardware System Structure

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NodeB hardware system structure

ISSUE 1.0

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ObjectivesObjectives

Upon completion of this course, you will be able to:

Master the hardware structure of the NodeB;

Master the functional principle of the subsystems

Master the functional principle of the board.

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ReferencesReferences

《 31026663- BTS3812E System Description(V1.50) 》

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Section 1 Introduction to Huawei’s NodeB solution

Section 2 Introduction to BTS3812E

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Huawei’s NodeB products Huawei’s NodeB products

Huawei offers a series of WCDMA NodeBs conform to 3GPP R4/R5 FDD protocols

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Huawei’s NodeB productsHuawei’s NodeB products

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Huawei’s Macro NodeB products

BTS3812E Cabinet appearance

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Huawei’s Macro NodeB products

BTS3812A Cabinet appearance

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Huawei’s Mini NodeB products Huawei’s Mini NodeB products

BTS3801 / 2 / 3 C Cabinet appearance

BTS3801C BTS3802C BTS3803C

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Huawei’s Distributed NodeB solutionHuawei’s Distributed NodeB solution

Appearance of DBS3800 units

BBU3806 RRU3801C

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Section 1 Introduction to Huawei’s NodeB solution


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Chapter 1 System Architecture

Chapter 2 Transport Subsystem

Chapter 3 Baseband Subsystem

Chapter 4 RF Subsystem

Chapter 5 Control Subsystem

Chapter 6 Antenna & Feeder Subsystem

Chapter 7 O&M Subsystem

Chapter 8 Hardware Configuration

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System Composition System Composition

The system of BTS3812E includes cabinet, antenna & feeder subsystem, O&M terminal, environment monitoring equipment and clock synchronization source.

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BTS3812E under full configuration BTS3812E under full configuration

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The Logical Structure of BTS3812EThe Logical Structure of BTS3812E

The logical structure of BTS3812E:

NBBI

NULP

NDTI/NAOI

NTTA

Antenna

NTTA

Antenna

RNC

TransportSubsystem

BTS3812E cabinet

RF SubsystemBasebandSubsystem

ControlSubsystem

MTRU

Rxo

Rx1

Tx PA

Rx path o

Rx path1

Tx path

MAFU

Dup

lexe

r

NDLP

NMPT

NMON

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The Logical Structure of BTS3812AThe Logical Structure of BTS3812A

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SummarySummary

In this section ,we have talked about the system composition,

logical structure and the working principle of the

BTS3812E/BTS3812A.

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Transport subsystem Transport subsystem

Consisting of NDTI and NAOI to interface with the RNC

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Operation of NDTI / NAOIOperation of NDTI / NAOI

Operating environment of NDTI / NAOI in BTS3812E

NDTI/NAOI RNC

NMPT

HULP

NBBI

HDLP

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Boards -NDTIBoards -NDTI

Providing E1/T1 ports to transmit ATM cells in IMA/UNI modes and supports AAL2 switching

Extracting clock signals from the Iub interface and providing them for NMPT as the clock reference source of the entire NodeB.

Each NDTI provides up to eight E1/T1 ports that serve as the physical ports between NodeB and RNC. It achieves transport between 2G and 3G systems in the fractional ATM mode and circuit emulation mode.

NDTIs can be installed in slots 12 and 13. The two NDTIs can share load. Under minimum configuration, at

least one NAOI or NDTI must be installed.

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Boards -NAOIBoards -NAOI

Supporting the transmission of ATM cells over STM-1 and supports AAL2 switching.

Each NAOI provides two 155 M optical ports. One port can satisfy the capacity requirement of the NodeB and the other is for cascading.

Providing four E1/T1 ports serving as circuit-emulation transmission channels for other equipment in the room.

Extracting clock signals from the Iub interface and providing them for NMPT as the clock reference source of the entire NodeB.

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SummarySummary

In this section ,we have learnt the transport subsystem composition, features and the working principle .

SummarySummary

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Baseband Subsystem Baseband Subsystem

Performing downlink processing, uplink processing and closed loop processing on the physical layer.

Including HULPs, HDLPs and NBBIs.

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Baseband Subsystem Baseband Subsystem

The baseband subsystem provides the following functions: Downlink processing: The baseband subsystem receives FP

packets from the transport subsystem. After channel coding, downlink modulation and power control, it transmits the data to the NBBI. The NBBI then allocates the DL data to the RF subsystem or RRU.

Uplink processing: The baseband subsystem receives the UL baseband data from the RF subsystem or the RRU. After demodulation and decoding, it sends the data in the format of FP packets to the transport subsystem.

Closed loop processing: The baseband subsystem implements physical layer closed loop processing for uplink & downlink power control, and DL closed loop transmit diversity processing. It retrieves related control information ( ex. uplink TPC, downlink TPC) from the UL received data and then sends the control information to DL transmit channels.

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Boards-NBBIBoards-NBBI

NBBI provides an interface between the RF subrack and the baseband subrack.

processes UL baseband signals and DL baseband signals. One NBBI can process up to UL signals and DL signals over 128 channels. The UL resources of NBBI and HULP build up the UL resource pool. The DL resources of NBBI and HDLP form the DL resource pool.

Work in 1+1 backup mode .

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Operation of NBBIOperation of NBBI

Operating Environment NBBIs

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Boards-NBOIBoards-NBOI

The NodeB baseband processing and optical interface unit (NBOI) is basically an NBBI plus a sub-board, that is, NodeB optical interface transfer unit (NOIT). NBOI is applicable to BTS3812E&BTS3812A connected with RRUs.

The NBOI has the following functions: Provides an interface between the RRU and the baseband

subrack in the master cabinet. Processing 128 uplink and downlink channel signals

NBOI contains three optical ports supporting remote RRU connection over 0.55 km (multi-mode), 10 km, and 40 km (single-mode)

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Operation of NBOIOperation of NBOI

Operating Environment of NBOIs

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Boards-HDLPBoards-HDLP

NodeB HSDPA supported downlink processing unit (HDLP) encodes and modulates DL signals.

One HDLP can process up to DL signals over 384 voice channels. HDLP supports DL processing of HSDPA services. HDLPs can be installed in slots 8 and 9. Under minimum

configuration, no HDLP might be installed.

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Operation of HDLPOperation of HDLP

Operating environment of an HDLP in the system

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Boards-HULPBoards-HULP

NodeB HSDPA supported uplink processing unit (HULP) performs search over uplink (UL) access channels, demodulation over dedicated channels (DCH), and UL decoding.

One HULP can process up to UL signals over 128 voice channels. HULP supports UL processing of HSDPA services. HULPs can be configured in slots 2 to 7 in the baseband subrack.

Under minimum configuration, it is not necessary to configure HULPs.

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Operation of HULPOperation of HULP

operating environment of NULP

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SummarySummary

In this section, we have learnt the baseband subsystem and the NBBI ， NBOI, HDLP, HULP boards.

SummarySummary

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RF SubsystemRF Subsystem

The RF subsystem includes MTRU and MAFU subracks.

NBBIMTRU MTRU MTRU MTRU MTRU MTRU

1 2 3 4 50

MAFU MAFU MAFU MAFU MAFU MAFU

1 2 3 4 50

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Boards-MTRUBoards-MTRU

Each MTRU provides two Rx channels and one Tx channel. Each MTRU supports bi-carrier processing. If the MTRU support two carriers, the configuration of output power

in each carrier can be flexible. By output power, there are two types of MTRU: 38 W and 50 W. BTS3812E can host up to six MTRUs.

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Boards-MAFUBoards-MAFU

BTS3812E can host one to six MAFU, and one to six MTRUs

accordingly. That is, the number of MAFU configured to

BTS3812E&BTS3812A is the same as that of MTRU.

MAFU controls the TMA and RET through feeders and built-in

internal (antenna interface standards group (AISG) interface.

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Operation of MTRU / MAFUOperation of MTRU / MAFU

Typical configuration of 1x1-2 way receive diversity

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Operation of MTRU / MAFUOperation of MTRU / MAFU

Typical configuration of 3x2 - 2 way receive diversity

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SummarySummary

In this section ,we have learnt the RF subsystem composition and it’s working principle .

SummarySummary

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Control Subsystem Control Subsystem

The control subsystem includes NMPT and NMON.

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Boards-NMPTBoards-NMPT

equipment management, performance testing, configuration management, NBAP common signaling processing, software download, switchover between active and standby NMPTs, and management of other boards in the system.

Controlling NFAN and environment monitoring equipment through NCCU.

It provides reference clock signals for the entire NodeB.. A BTS3812E cabinet can host up to two NMPTs, which work in the

active/standby mode.

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Operation of NMPTOperation of NMPT

Operating environment of NMPT

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Boards -NMONBoards -NMON

NMON provides the input and output interfaces for the NodeB to monitor other equipment. The 32-line input interface is used to collect alarms of the peripheral devices and the 7-line output interface is used to control other equipment.

NMON adjusts and controls the RET through the MAFU.

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Operation of NMONOperation of NMON

Operating environment of NMON

NMONNMPT Input ports

Output control ports

MAFU RET

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Clock Synchronization Clock Synchronization

BTS3812E supports three clock synchronization modes: Synchronization with Iub interface clock signals Synchronization with GPS clock signals Synchronization with external reference clock signals Internal free-run mode .

The clock synchronization of the BTS3812E is achieved by the clock module of the NMPT, which provides timing signals for the entire NodeB.

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SummarySummary

In this section ,we have learnt the control subsystem composition and it’s working principle .

SummarySummary

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Antenna & Feeder SubsystemAntenna & Feeder Subsystem

composition:

Antenna

TMA

Antennastand

Jumper

JumperFeeder

Jumper

NodeBcabinet

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Antenna & Feeder SubsystemAntenna & Feeder Subsystem

Antenna :

By radiation features in horizontal directions:

- Omni directional antennas

- Directional antennas

By polarization features:

- Single polarization antennas

- Dual polarization antennas The antenna connector is a DIN connector (7/16'').

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FeederFeeder

Feeder :

For the main feeders, there are three choices: 7/8" feeders: used for the distance shorter than 40 m 5/4" feeders: used for the distance longer than 40 m 1/2" super-flexible cables are used between:

Antennas and main feeders;

Antennas and TMAs;

Cabinet and main feeders.

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TMATMA

A tower mounted amplifier (TMA) is a low noise amplification module installed on the tower top. It is the RF front end. TMA amplifies the received weak signals on the tower top to increase the receive sensitivity and improve the UL receiving performance.

There are two types of TMAs:

Single TMA;

Double TMAs. The bypass function on power-off ensures that the received signals

can bypass LNA and reach the BTS3812E upon LNA failure.

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SummarySummary

In this section ,we have learnt the Antenna

& Feeder subsystem and its components .

SummarySummary

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O&M Subsystem O&M Subsystem

O&M Subsystem composition:

RNC

NodeB

NodeB

IP over Ethernet

IP over Ethernet

IPoA

IPoA

Internet/DDN

PSTN

Modem

Modem

iManager M2000LMT

LMT

LMT

LMT

LMT

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O&M SubsystemO&M Subsystem

operators can perform O&M for a NodeB through the following three ways: Far end maintenance: Maintaining NodeBs on M2000 Client in

the NMS center through the Internet or Intranet provided by the operator. The RNC provides the IP route

Near end maintenance: Maintaining a NodeB on LMT through the local Ethernet port of the NodeB.

Reversed maintenance: Maintaining another NodeB on LMT through the local Ethernet port of this NodeB. The RNC provides the IP route.

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The maintenance terminals include the LMT and M2000. The LMT can perform maintenance for only one NodeB at a time.

M2000 provides powerful remote centralized O&M functions and can perform maintenance for several NEs including NodeBs.

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Hardware of O&M subsystem

NodeB Cabinet

NMPT

NDTI/NAOI

NDLP

NULP

NMON

NBBI MTRU

MAFU

M2000

LMT

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SummarySummary

In this section ,we have learnt the O&M

subsystem composition and it’s working

principle .

SummarySummary

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Documents

NodeB Hardware System Structure