3900 Series GSM Base Station Technical Description(V100R013_Draft a)

3900 Series GSM Base StationV100R013

Technical Description

Issue Draft A

Date 2011-01-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue Draft A (2011-01-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

i

http://www.huawei.com

mailto:[email protected]

About This Document

OverviewThis document provides information about 3900 series GSM base stations such as systemprinciples, operation and maintenance, clock synchronization schemes, and surge protectionspecifications, aiming to enable operators to comprehensively understand functions of the 3900series GSM base stations.

Product VersionThe following table lists product versions involved in this document.

Product Name Product Version

BTS3900 GSM (BTS3900 for short) V100R013

BTS3900A GSM (BTS3900A for short) V100R013

BTS3900L GSM (BTS3900L for short) V100R013

DBS3900 GSM (DBS3900 for short) V100R013

Intended AudienceThis document is intended for:

l Network plannersl Field engineersl System engineers

Organization1 Changes in the 3900 Series GSM Base Station Technical Description

3900 Series GSM Base StationTechnical Description About This Document


iii

This section describes changes in the 3900 Series GSM Base Station Technical Description ofeach version.

2 Overview

3900 series base stations adopt the cutting-edge modular design for different modes and aremanaged by various systems. With simple components, they can be installed and deployed easilyand fast. With comprehensive functions and remarkable performance, they can meetrequirements in various scenarios. In addition, they are diversified by flexibly combiningfunctional modules and auxiliary devices.

3 BTS System Principle

The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Itsfunctional subsystem includes the control system, transport system, monitoring system, RFsystem, antenna system, and power supply system.

4 Control and Transport Systems

The functions of the control and transport systems are provided by the BBU. The control systemmanages the entire BTS system in a centralized manner, including signaling processing,operation and maintenance, and system clock. The transport system provides physical portsconnecting the BTS and the transport network.

5 RF System

The functions of the RF system are provided by RF modules including the radio frequency units(RFUs) that are used in macro base stations and remote radio units (RRUs) that are used indistributed base stations. The RF system performs modulation, demodulation, data processing,and combination and division of RF and baseband signals.

6 Antenna System

The antenna system consists of antennas, feeders, jumpers, the Tower Mounted Amplifier(TMA), the Bias Tee (BT), and the GSM Antenna and TMA Control Module (GATM). Ittransmits and receives RF signals.

7 Operation and Maintenance

Operation and Maintenance (OM) covers management, monitoring, and maintenance of thesoftware, hardware, and configuration of the BTSs. In addition, diversified OM modes areprovided in various scenarios.

8 External Reference Clock Sources

The BTS supports multiple external reference clock sources, including the IP reference clock,E1/T1 reference clock, synchronous Ethernet reference clock, BITS reference clock, and GPS/RGPS reference clock. If a BTS fails to obtain clock signals, it works in free-run mode for acertain period of time.

9 Surge Protection Specifications

This section provides surge protection specifications for the BBU, RF modules, and each typeof base stations.

ConventionsSymbol Conventions

The symbols that may be found in this document are defined as follows.

About This Document3900 Series GSM Base Station


iv Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

Issue Draft A (2011-01-30)

Symbol Description

Indicates a hazard with a high level of risk, which if notavoided, will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided, could result in equipment damage, data loss,performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or savetime.

Provides additional information to emphasize or supplementimportant points of the main text.

General Conventions

The general conventions that may be found in this document are defined as follows.

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are inCourier New.

Command Conventions

The command conventions that may be found in this document are defined as follows.


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated byvertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.

3900 Series GSM Base StationTechnical Description About This Document


v


{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.


Boldface Buttons, menus, parameters, tabs, window, and dialog titlesare in boldface. For example, click OK.

> Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder.

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn.

Mouse Operations

The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without movingthe pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.

Drag Press and hold the primary mouse button and move thepointer to a certain position.

About This Document3900 Series GSM Base Station


vi Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.


Contents

About This Document...................................................................................................................iii

1 Changes in the 3900 Series GSM Base Station Technical Description............................1-1

2 Overview......................................................................................................................................2-1

3 BTS System Principle................................................................................................................3-1

4 Control and Transport Systems...............................................................................................4-14.1 Logical Structure of the BBU..........................................................................................................................4-24.2 BBU Transmission Ports.................................................................................................................................4-34.3 Transport Network Topologies.......................................................................................................................4-4

5 RF System....................................................................................................................................5-15.1 Logical Structure of the RRU3004..................................................................................................................5-35.2 Logical Structure of RRU3008.......................................................................................................................5-45.3 Logical Structure of the DRFU.......................................................................................................................5-65.4 Logical Structure of the GRFU.......................................................................................................................5-85.5 RF Cable Connections of the DRFUs.............................................................................................................5-95.6 RF Cable Connections of the GRFUs...........................................................................................................5-205.7 RF Cable Connections for the Coexistence of the DRFUs and GRFUs.......................................................5-235.8 CPRI-Based Topologies................................................................................................................................5-26

6 Antenna System..........................................................................................................................6-1

7 Operation and Maintenance....................................................................................................7-17.1 OM Modes of the BTS....................................................................................................................................7-27.2 OM Functions of the BTS...............................................................................................................................7-6

8 External Reference Clock Sources...........................................................................................8-1

9 Surge Protection Specifications...............................................................................................9-1

3900 Series GSM Base StationTechnical Description Contents


vii

Figures

Figure 2-1 BSS architecture.................................................................................................................................2-2Figure 3-1 BTS system principle..........................................................................................................................3-1Figure 4-1 Logical structure of the BBU..............................................................................................................4-2Figure 4-2 TDM network topology......................................................................................................................4-5Figure 4-3 Re-established topology after transmission is disrupted on a ring topology......................................4-6Figure 4-4 IP network topology........................................................................................................................... 4-7Figure 4-5 HDLC network topology....................................................................................................................4-8Figure 5-1 Logical structure of the RRU3004......................................................................................................5-3Figure 5-2 Logical structure of RRU3008........................................................................................................... 5-5Figure 5-3 Logical structure of the DRFU...........................................................................................................5-7Figure 5-4 Logical structure of the GRFU...........................................................................................................5-8Figure 5-5 Mapping between the RF signal cables and their colors.................................................................... 5-9Figure 5-6 RF cable connections of S1 (Transmit Independency or Combining/transmit diversity)/S2 (TransmitIndependency or Combining)..............................................................................................................................5-11Figure 5-7 RF cable connections of the DRFU with Transmit Independency or Combining............................5-12Figure 5-8 RF cable connections of S2 (PBT)/S3 (Transmit Independency or Combining)/S4 (TransmitIndependency or Combining)..............................................................................................................................5-14Figure 5-9 RF cable connections of S3/3 configured with three DRFUs...........................................................5-15Figure 5-10 RF cable connections of S2 with 4-way RX diversity....................................................................5-16Figure 5-11 RF cable connections of S2 (transmit diversity)/S4 (transmit independency)...............................5-17Figure 5-12 RF cable connections of S5 (Transmit Independency or Combining)/S6 (Transmit Independency orCombining)..........................................................................................................................................................5-19Figure 5-13 RF cable connections of S7 (Transmit Independency or Combining)/S8 (Transmit Independency orCombining)..........................................................................................................................................................5-20Figure 5-14 Mapping between the RF signal cables and their colors................................................................5-20Figure 5-15 RF cable connections (1)................................................................................................................5-21Figure 5-16 RF cable connections (2)................................................................................................................5-22Figure 5-17 RF cable connections (3)................................................................................................................5-23Figure 5-18 Mapping between the RF signal cables and their colors................................................................5-24Figure 5-19 RF cable connections (1)................................................................................................................5-24Figure 5-20 RF cable connections (2)................................................................................................................5-25Figure 5-21 RF cable connections (3)................................................................................................................5-26Figure 5-22 CPRI-based topologies...................................................................................................................5-27Figure 7-1 Network structure of the OM system................................................................................................. 7-2

3900 Series GSM Base StationTechnical Description Figures


ix

Tables

Table 2-1 BTS Types............................................................................................................................................2-2Table 4-1 Specifications of transmission ports on the GTMU and UTRP boards...............................................4-3Table 4-2 Usage scenarios and advantages of the four topologies.......................................................................4-6Table 5-1 Configuration description (1).............................................................................................................5-10Table 5-2 Configuration description (2).............................................................................................................5-13Table 5-3 Configuration description (3).............................................................................................................5-14Table 5-4 Configuration description (4).............................................................................................................5-16Table 5-5 Configuration description (5).............................................................................................................5-18Table 5-6 Configuration description (6).............................................................................................................5-19Table 5-7 Typical configurations of the sending receiving mode......................................................................5-21Table 5-8 Characteristics of the three topologies...............................................................................................5-28Table 5-9 Specifications of CPRI ports on the GTMU board............................................................................5-29Table 5-10 Specifications of CPRI ports on different RF modules....................................................................5-29Table 7-1 Functions of the BTS OM system........................................................................................................7-3Table 9-1 Surge protection specifications for the ports on the BTS3900............................................................ 9-1Table 9-2 Surge protection specifications for the ports on the BTS3900L..........................................................9-2Table 9-3 Surge protection specifications for the ports on the BTS3900A..........................................................9-2Table 9-4 Surge protection specifications for the ports on the BBU3900............................................................9-3Table 9-5 Surge protection specifications for the ports on the RRU3004 or RRU3008 V1................................9-5Table 9-6 Surge protection specifications for the ports on the DRFU, GRFU, or RRU3008 V2........................9-6

3900 Series GSM Base StationTechnical Description Tables


xi

1 Changes in the 3900 Series GSM Base StationTechnical Description

This section describes changes in the 3900 Series GSM Base Station Technical Description ofeach version.

Draft A (2011-01-30)

This is the Draft A release of V100R013.

Compared with issue 05 (2011-01-20) of V100R012, this issue includes the following newtopics:

l 2 Overviewl 3 BTS System Principlel 4.2 BBU Transmission Portsl 5.3 Logical Structure of the DRFUl 5.4 Logical Structure of the GRFUl 6 Antenna Systeml 7 Operation and Maintenance

Compared with issue 05 (2011-01-20) of V100R012, this issue incorporates the followingchanges:

Topic Description

5.8 CPRI-Based Topologies Specifications of CPRI ports are added anddescription is optimized.

8 External Reference Clock Sources Description about clock sources is modified.

9 Surge Protection Specifications Surge protection specifications are updated.

Compared with issue 05 (2011-01-20) of V100R012, this issue excludes the following topics:

l DBS3900 Product Family

3900 Series GSM Base StationTechnical Description

1 Changes in the 3900 Series GSM Base Station TechnicalDescription


1-1

l System Architecture of the BTS3900l System Architecture of the BTS3900Al System Architecture of the BTS3900Ll DBS3900 Monitoring Schemesl BTS3900 Monitoring Systeml BTS3900A Monitoring Systeml BTS3900L Monitoring Systeml Configuration of the BTS3900/BTS3900Al Configuration of the BTS3900Ll Signal Flow of the BTS3900/BTS3900Al Signal Flow of the BTS3900Ll Typical Scenarios of the DBS3900 (with the DC RRU)l Typical Scenarios of the DBS3900 (with the AC RRU)l Software Structure of the BTS

1 Changes in the 3900 Series GSM Base Station TechnicalDescription

3900 Series GSM Base StationTechnical Description

1-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.


2 Overview

3900 series base stations adopt the cutting-edge modular design for different modes and aremanaged by various systems. With simple components, they can be installed and deployed easilyand fast. With comprehensive functions and remarkable performance, they can meetrequirements in various scenarios. In addition, they are diversified by flexibly combiningfunctional modules and auxiliary devices.

BTS in the BSSThe base station subsystem (BSS) is made up of the base station controller (BSC) and the basetransceiver station (BTS), as shown in Figure 2-1.

3900 Series GSM Base StationTechnical Description 2 Overview


2-1

Figure 2-1 BSS architecture

BTS TypesThere are four types of BTSs, that is, BTS3900, BTS3900A, BTS3900L, and DBS3900, meetingrequirements in various scenarios, as shown in Table 2-1.

Table 2-1 BTS Types

Name

Type ApplicationScenario

InputPower

CabinetCombination

Reference

BTS3900

Indoormacrobasestation

Indoor installationscenarios wheretraffic load isheavy, lease cost ofequipment room ishigh, or equipmentroom is space-limited.

l -48 VDC

l +24 VDC

l 220 VAC

l 110 VAC

l Single cabinetl Double

cabinet: Twocabinets areinstalled sideby side or twocabinets arestacked.

For informationabout applicationandconfiguration,see the BTS3900GSM HardwareDescription.

2 Overview3900 Series GSM Base Station




Name


InputPower

CabinetCombination

Reference

BTS3900A

Outdoormacrobasestation

Outdoorinstallationscenarios wherewide coverage isrequired such ascities, suburbs, orrural areas.

l -48 VDC

l 220 VAC

l 110 VAC

l TMC11H+RFC

l APM30H+RFC(+IBBS+TMC11H)

The APM30H isthe powercabinet, RFC isthe radiofrequencycabinet,TMC11H is thetransmissioncabinet, andIBBS is thebattery cabinet.For informationabout applicationandconfiguration,see theBTS3900A GSMHardwareDescription.

BTS3900L

Indoormacrobasestation

Indoor installationscenarios withlarge capacitywhere traffic loadis heavy, lease costof equipment roomis high, orequipment room isspace-limited.

-48 V DC Single cabinet For informationabout applicationandconfiguration,see the BTS3900GSM HardwareDescription.

3900 Series GSM Base StationTechnical Description 2 Overview


2-3

Name


InputPower

CabinetCombination

Reference

DBS3900

Distributedbasestation

Outdoorinstallationscenarios wherebase stationdeployment isdifficult and widecoverage isrequired.

l -48 VDC

l +24 VDC

l 220 VAC

l BBU+APM30H+RRU

l BBU+TMC11H+RRU

l BBU+19-inchrack+RRU

l Indoor wall-mounted BBU+RRU

l BBU+OMB+RRU

l BBU+ICR+RRU

l BBU+IMB03+RRU

The APM30H isthe powercabinet,TMC11H is thetransmissioncabinet, OMB isthe outdoor minibox, ICR is theindoorcentralized rack,and the IMB03 isthe indoor minibox. Forinformationabout applicationandconfiguration,see the DBS3900InstallationGuide andDBS3900 (ICR)InstallationGuide.

2 Overview3900 Series GSM Base Station




3 BTS System Principle

The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Itsfunctional subsystem includes the control system, transport system, monitoring system, RFsystem, antenna system, and power supply system.

Figure 3-1 shows the BTS system principle.

Figure 3-1 BTS system principle

Functions of each system are as follows:

l Control system: Manage the entire BTS system in a centralized manner, including operationand maintenance, signaling processing, and system clock. For details, see section 4 Controland Transport Systems.

l Transport system: Provide physical ports connecting the BTS and the transport networkand also provides maintenance channels connecting the BTS and the Operation and

3900 Series GSM Base StationTechnical Description 3 BTS System Principle


3-1

Maintenance Center (OMC) to enable information exchange between the BTS and thetransport network or OMC. For details, see section 4 Control and Transport Systems.

l Monitoring system: Collect external alarm information and report the information to thecontrol system. For details, see chapter Monitoring System in the HardwareDescription of the corresponding base station type.

l RF system: Process RF and baseband signals. For details, see section 5 RF System.l Antenna system: Receive uplink signals and transmit downlink signals. For details, see

section 6 Antenna System.l Power supply system: Obtain power from external power supply devices and provide power

for other subsystems of the BTS. For details, see chapter Power System in the HardwareDescription of the corresponding base station type.

3 BTS System Principle3900 Series GSM Base Station




4 Control and Transport Systems

About This Chapter

The functions of the control and transport systems are provided by the BBU. The control systemmanages the entire BTS system in a centralized manner, including signaling processing,operation and maintenance, and system clock. The transport system provides physical portsconnecting the BTS and the transport network.

4.1 Logical Structure of the BBUThe BBU consists of the main processing unit, BTS interface unit, high-speed interface unit,clock unit, and monitoring unit.

4.2 BBU Transmission PortsThe GTMU or UTRP board provides transmission ports to enable information exchange betweenthe BTS and the transport network.

4.3 Transport Network TopologiesTransport network topologies include TDM, IP, and High level Data Link Control (HDLC)network topologies. In reality, these topologies are combined to save transmission device costswithout deteriorating service quality.

3900 Series GSM Base StationTechnical Description 4 Control and Transport Systems


4-1

4.1 Logical Structure of the BBUThe BBU consists of the main processing unit, BTS interface unit, high-speed interface unit,clock unit, and monitoring unit.

Figure 4-1 shows the logical structure of the BBU.

Figure 4-1 Logical structure of the BBU

The control system consists of the main processing unit while the transport system consists ofthe BTS interface unit and high-speed interface unit.

Main Processing Unit

The main processing unit manages the entire BTS system in a centralized manner, includingoperation and maintenance, signaling processing, and system clock. It provides the followingfunctions:

l Support such protocols as UART, HDLC, and IP over FE.l Control the BTS interface unit to enable communication between the BBU and the BSC.l Control the High-speed interface unit to enable communication between the BBU and RF

modules.l Provide system clock for the BTS and obtain external clock signals.

BTS Interface Unit

The BTS interface unit enables information exchange between the BTS and the transport networkby providing the following functions:

l Connect the BTS with the BSC.l Exchange data between the E1 link and the DBUS.

4 Control and Transport Systems3900 Series GSM Base Station




l Synchronize an upper-level clock with a lower-level clock.

High-Speed Interface Unit

The high-speed interface unit enables information exchange between the BBU and RF modulesby providing the following functions:

l Receive the uplink baseband data from RF modules.

l Transmit the downlink baseband data to RF modules.

Clock Unit

The clock unit provides the following functions:

l Provide system clock stemmed from high-precision clock sources for the BTS.

l Check the phase-locked status, provide phase lock for the software, adjust DA, and generateframe numbers.

Monitoring Unit

The monitoring unit collects external alarms and reports the alarms to the central processingunit.

4.2 BBU Transmission PortsThe GTMU or UTRP board provides transmission ports to enable information exchange betweenthe BTS and the transport network.

Table 4-1 provides the specifications of transmission ports on the GTMU and UTRP boards.

Table 4-1 Specifications of transmission ports on the GTMU and UTRP boards

TransmissionMode

Board Port Capacity

TDM over E1/T1 GTMU/GTMUb 1 4 ports

UTRPb4 1 4 ports

IP over E1/T1 GTMU/GTMUb 1 4 ports

Transmission overFE optical ports

GTMU/GTMUb 1 10 Mbit/s or 100Mbit/s

Transmission overFE electrical ports

GTMU/GTMUb 1 10 Mbit/s or 100Mbit/s

NOTEThe GTMU or GTMUb board is a mandatory board while the UTRPb4 board must be configured only whenmore than four E1s/T1s are required.



4-3

4.3 Transport Network TopologiesTransport network topologies include TDM, IP, and High level Data Link Control (HDLC)network topologies. In reality, these topologies are combined to save transmission device costswithout deteriorating service quality.

TDM Network TopologyE1/T1 transmission is adopted for communication between the BTS and the BSC while TDMtransmission is adopted on the Abis interface. TDM network topology includes such networktopologies as chain, star, tree, and ring, as shown in Figure 4-2.





Figure 4-2 TDM network topology

Table 4-2 describes usage scenarios and advantages of the preceding four topologies.



4-5

Table 4-2 Usage scenarios and advantages of the four topologies

Topology Usage Scenario Advantage

Star A wild range of areas,especially densely populatedareas

l Networking is simple.l Engineering is easy.l Maintenance is easy.l Network capacity expansion is easy.l Transmission reliability is high.

Chain Strip areas that are sparselypopulated such as areas alonghighways and railways

This topology helps reduce expenditureon transmission device, engineering,and leased transmission cables.

Tree Areas where networkarchitecture, site distribution,and subscriber distributionare complicated such as anarea where large-scalecoverage overlaps with hotspot areas or small-scalecoverage.

Compared with the star topology, thistopology requires fewer transmissioncables.

Ring A wild range of areas.Because of its self-healingcapability, this topology isrecommended when a route isavailable.

A ring topology can automatically splitinto two chains if transmission isdisrupted at a breakpoint and basestations before and after the breakpointcan still function properly. Thisimproves the system robustness. Asshown in Figure 4-3, transmission isdisrupted at B. Before disruption, BTSs0, 1, and 2 are connected in a clockwisedirection, forming a ring topology. Afterdisruption, transmission is normal atBTS 0 and BTSs 1 and 2 form a chaintopology with BTS 2 being the upper-level base station.

Figure 4-3 Re-established topology after transmission is disrupted on a ring topology





IP Network TopologyFE transmission is adopted for communication between the BTS and the BSC while IPtransmission is adopted on the Abis interface. IP network topology includes layer 2 and layer 3network topologies, as shown in Figure 4-4.

Figure 4-4 IP network topology

HDLC Network TopologyE1/T1 transmission is adopted for communication between the BTS and the BSC while HDLCtransmission is adopted on the Abis interface. HDLC network topology includes such networktopologies as chain, star, and ring, as shown in Figure 4-5.



4-7

Figure 4-5 HDLC network topology





5 RF System

About This Chapter

The functions of the RF system are provided by RF modules including the radio frequency units(RFUs) that are used in macro base stations and remote radio units (RRUs) that are used indistributed base stations. The RF system performs modulation, demodulation, data processing,and combination and division of RF and baseband signals.

5.1 Logical Structure of the RRU3004An RRU3004 module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), dual duplexer, and low noise amplifier (LNA).

5.2 Logical Structure of RRU3008RRU3008 consists of the main control and high-speed interface unit, signal processing unit,power amplifier (PA), dual duplexer, low noise amplifier (LNA), and RX.

5.3 Logical Structure of the DRFUAn DRFU module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), and dual-duplexer.

5.4 Logical Structure of the GRFUAn GRFU module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), and duplexer.

5.5 RF Cable Connections of the DRFUsOne end of the RF jumper is connected to the RF port on the DRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

5.6 RF Cable Connections of the GRFUsOne end of the RF jumper is connected to the RF port on the GRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

5.7 RF Cable Connections for the Coexistence of the DRFUs and GRFUsOne end of the RF jumper is connected to the RF port on the RFU, and the other end is connectedto the feeder. You can determine the appropriate RF ports based on the actual networking modes.

5.8 CPRI-Based Topologies

3900 Series GSM Base StationTechnical Description 5 RF System


5-1

Multiple CPRI-based topologies such as chain, star, and ring are supported for communicationbetween BBUs and RF modules.

5 RF System3900 Series GSM Base Station




5.1 Logical Structure of the RRU3004An RRU3004 module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), dual duplexer, and low noise amplifier (LNA).

Figure 5-1 shows the logical structure of the RRU3004.

Figure 5-1 Logical structure of the RRU3004

RXM_OUT: RRU RX main output for cascaded RRUmodules

RXM_IN: RRU RX diversity input for cascaded RRUmodules

High-Speed Interface UnitThe high-speed interface unit performs the following functions:

l Receives downlink data from the upper-level equipment, such as the BBU.l Transmits uplink data to the upper-level equipment, such as the BBU.l Transfers data between cascaded RRU modules through the CPRI ports.

Signal Processing UnitThe signal processing unit consists of two uplink RX channels, two downlink TX channels, anda control module. The signal processing unit processes baseband signals and RF signals.

Major functions of an uplink receive channel are as follows:l Convert received signals into intermediate frequency analog signals by performing down-

conversion.l Convert intermediate frequency analog signals into digital signals by using an Analog Digit

Converter (ADC).



5-3

l Process intermediate frequency digital signals.

l Match filtering.

l Provide a Digital Automatic Gain Control (DAGC).

l Pack data.

Major functions of a downlink transmit channel are as follows:

l Unpack signals that are transmitted from the BBU including clock, control, and data signals.Then, transmit unpacked signals to specified units.

l Combine and filter multiple routes of signals.

l Convert digital signals into analog signals by using a Digit Analog Converter (DAC). Then,perform Inphase and Quadrature (IQ) modulation.

l Convert RF signals into signals that can be transmitted in transmit frequency bands byperforming up-conversion.

The control module performs the following functions:

l Initializes and loads the RRU.

l Collects alarm information and reports the board status.

l Receives configuration commands from the BBU and performs configuration managementof other modules.

l Operates and maintains the RRU.

PA

PA amplifies power of multi-carrier and low-power RF signals that are sent from the signalprocessing unit.

Dual Duplexer

The dual duplexer has the following major functions:

l Provide a function that multiplexes received and transmitted signals on an RF channel. Bydoing this, the signals are multiplexed on one antenna channel.

l Filter signals.

LNA

LNA performs low noise amplification on signals received by antennas.

5.2 Logical Structure of RRU3008RRU3008 consists of the main control and high-speed interface unit, signal processing unit,power amplifier (PA), dual duplexer, low noise amplifier (LNA), and RX.

Figure 5-2 shows the logical structure of RRU3008.





Figure 5-2 Logical structure of RRU3008

RXM_OUT: It is a main receive output port and used forRRU cascading.

RXD_IN: It is a receive diversity input port and usedfor RRU cascading.

Main Control and High-Speed Interface UnitThis unit has the following major functions:

l Receive data from the BBU.l Send data to the BBU.l Transfer data transmitted from cascaded RRUs by using CPRI ports.l Initialize RRU configurations and load RRU software.l Collect alarms and report board status.l Execute configuration commands sent from the BBU and perform configuration

management on other units of an RRU.l Operate and maintain RRUs.

Signal Processing UnitThis unit includes two uplink receive channels, two downlink transmit channels, a feedbackchannel, and a GSM baseband signal processing unit. It mainly processes RF signals and GSMbaseband signals.

Major functions of an uplink receive channel are as follows:l Convert received signals into intermediate frequency analog signals by performing down-

conversion.l Convert intermediate frequency analog signals into digital signals by using an Analog Digit

Converter (ADC).l Process intermediate frequency digital signals.l Match filtering.



5-5

l Provide a Digital Automatic Gain Control (DAGC).

l Pack data.

Major functions of a downlink transmit channel are as follows:

l Unpack signals that are transmitted from the BBU including clock, control, and data signals.Then, transmit unpacked signals to specified units.

l Combine and filter multiple routes of signals.

l Convert digital signals into analog signals by using a Digit Analog Converter (DAC). Then,perform Inphase and Quadrature (IQ) modulation.

l Convert RF signals into signals that can be transmitted in transmit frequency bands byperforming up-conversion.

The GSM baseband signal processing unit has the following major functions:

l Receive demodulating and decoding codes.

l Encode, modulate, and shape and filter the downlink signals.

PA

PA amplifies power of multi-carrier and low-power RF signals that are sent from the signalprocessing unit.

Dual Duplexer

The dual duplexer has the following major functions:

l Provide a function that multiplexes received and transmitted signals on an RF channel. Bydoing this, the signals are multiplexed on one antenna channel.

l Filter signals.

LNA

LNA performs low noise amplification on signals received by antennas.

RX

RX converts signals sent from the LNA into intermediate frequency analog signals byperforming down-conversion. Then, it amplifies the intermediate frequency analog signals.Finally, it sends the signals to the ADC.

5.3 Logical Structure of the DRFUAn DRFU module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), and dual-duplexer.

Figure 5-3 shows the logical structure of the DRFU.





Figure 5-3 Logical structure of the DRFU


The High-speed interface unit has the following functions:

l Transmits the signals received from the BBU to the signal processing unitl Transmits the signals received from the signal processing unit to the BBU

Signal Processing Unit

The signal processing unit consists of two UL RX channels and two DL TX channels.

The UL RX channel has the following functions:l Performs down-conversion of the RF signals to IF signalsl Amplifies the IF signals and performs IQ demodulationl Performs analog-to-digital conversion through the ADCl Samples digital signalsl Performs matched filteringl Performs Digital Automatic Gain Control (DAGC)l Encapsulates data

The DL TX channel has the following functions:l Processes the clock signals, control signals, and data signals from the BBU and sends them

to associated unitsl Shapes and filters DL signalsl Performs digital-to-analog conversion through the DAC and performs IQ modulationl Performs up-conversion of RF signals to the transmit band

PA

The power amplifier amplifies the low-power RF signals from the signal processing unit.



5-7

Dual-Duplexer

The dual-duplexer has the following functions:

l Multiplexes the RX signals and TX signalsl Enables RX signals and TX signals to share one antenna channell Filters RX signals and TX signals

5.4 Logical Structure of the GRFUAn GRFU module consists of the high-speed interface unit, signal processing unit, poweramplifier (PA), and duplexer.

Figure 5-4 shows the logical structure of the GRFU.

Figure 5-4 Logical structure of the GRFU


The High-speed interface unit has the following functions:

l Transmits the signals received from the BBU to the signal processing unitl Transmits the signals received from the signal processing unit to the BBU

Signal Processing Unit

The signal processing unit consists of two UL RX channels and one DL TX channel.

The UL RX channel has the following functions:l Performs down-conversion of the RF signals to IF signalsl Amplifies the IF signals and performs IQ demodulationl Performs analog-to-digital conversion through the ADCl Samples digital signals





l Performs matched filtering

l Performs Digital Automatic Gain Control (DAGC)

l Encapsulates data

The DL TX channel has the following functions:

l Processes the clock signals, control signals, and data signals from the BBU and sends themto associated units

l Shapes and filters DL signals

l Performs digital-to-analog conversion through the DAC and performs IQ modulation

l Performs up-conversion of RF signals to the transmit band

PA

The power amplifier amplifies the low-power RF signals from the signal processing unit.

Duplexer

The duplexer has the following functions:

l Multiplexes the RX signals and TX signals

l Enables RX signals and TX signals to share one antenna channel

l Filters RX signals and TX signals

5.5 RF Cable Connections of the DRFUsOne end of the RF jumper is connected to the RF port on the DRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

NOTEThe DRFU is categorized into the DRFU GSM900 and DRFU GSM1800. The cable connections of thetwo types are all the same. This section takes the DRFU GSM900 as an example.

RF Cable Connectionsl The TX/RX mode and Sending Receiving Mode described in the following list are set on

the BSC side.

l The RF cables differ from each other in colors. Figure 5-5 shows the mapping between theRF signal cables and their colors.

Figure 5-5 Mapping between the RF signal cables and their colors



5-9

S1 with Transmit Independency or Combining, S1 with Transmit Diversity, andS2 with Transmit Independency or Combining

The S1 with Transmit Independency or Combining, S1 with transmit diversity, and S2 withTransmit Independency or Combining use the configuration of one DRFU and one dual-polarized antenna. Table 5-1 describes the related configurations.

Table 5-1 Configuration description (1)

NetworkingConfiguration

Transmit mode SendingReceiving Mode

HardwareConfiguration

S1, TransmitIndependency orCombining

TransmitIndependency orCombining

Double Feeder(2TX + 2RX)

l One DRFUl One dual-

polarized antenna

S1, TransmitDiversity

Transmit Diversity Double Feeder(2TX + 2RX)




Figure 5-6 shows cable connections.





Figure 5-6 RF cable connections of S1 (Transmit Independency or Combining/transmitdiversity)/S2 (Transmit Independency or Combining)

The other available Sending Receiving Mode for the DRFU with Transmit Independency orCombining are Single Feeder (1TX + 1RX), Double Feeder (1TX + 1RX), and Double Feeder(1TX + 2RX). The transmit mode is Transmit Independency or Combining. Figure 5-7 showscable connections.



5-11

Figure 5-7 RF cable connections of the DRFU with Transmit Independency or Combining





S2 with PBT, S3 with Transmit Independency or Combining, and S4 with TransmitIndependency or Combining

The S2 with PBT, S3 with Transmit Independency or Combining, and S4 with TransmitIndependency or Combining use the configuration of two DRFUs and one dual-polarizedantenna. Table 5-2 describes the related configurations.





S2, PBT PBT Single Feeder (1TX+ 2RX)

l Two DRFUsl One dual-

polarized antennaS3, TransmitIndependency orCombining


Single Feeder (1TX+ 2RX)







5-13

Figure 5-8 RF cable connections of S2 (PBT)/S3 (Transmit Independency or Combining)/S4(Transmit Independency or Combining)

The S3/3 with Transmit Independency or Combining uses three DRFUs and two dual-polarizedantennas. Table 5-3 describes the related configurations.





S3/3, TransmitIndependency orCombining


l DRFU0: SingleFeeder (1TX +2RX)

l DRFU1: DoubleFeeder (2TX +4RX)


l Three DRFUsl Two dual-

polarizedantennas






Figure 5-9 RF cable connections of S3/3 configured with three DRFUs

S2 with 4-Way RX DiversityThe S2 with 4-way RX diversity uses two DRFUs and two dual-polarized antennas. The typicalconfigurations are as follows:

l Set the receive mode to 4-Way Receive Diversity.l Set the sending receiving mode to Double Feeder (2TX + 4RX).




5-15

Figure 5-10 RF cable connections of S2 with 4-way RX diversity

S2 with Transmit Diversity and S4 with Transmit Independency

The S2 with transmit diversity and S4 with transmit independency use the configuration of twoDRFUs and two dual-polarized antennas. Table 5-4 describes the related configurations.





S2, TransmitDiversity

Transmit Diversity Double Feeder(2TX + 2RX)

l Two DRFUsl Two dual-

polarizedantennas

S4, TransmitIndependency








Figure 5-11 RF cable connections of S2 (transmit diversity)/S4 (transmit independency)

S5 with Transmit Independency or Combining and S6 with TransmitIndependency or Combining

The S5 with Transmit Independency or Combining and S6 with Transmit Independency orCombining use the configuration of three DRFUs and two dual-polarized antennas. Table 5-5describes the related configurations.



5-17










l Three DRFUsl Two dual-

polarizedantennas











Figure 5-12 RF cable connections of S5 (Transmit Independency or Combining)/S6 (TransmitIndependency or Combining)

S7 with Transmit Independency or Combining and S8 with TransmitIndependency or Combining

The S7 with Transmit Independency or Combining and S8 with Transmit Independency orCombining use the configuration of four DRFUs and two dual-polarized antennas. Table 5-6describes the related configurations.








l Four DRFUsl Two dual-

polarizedantennasS8, Transmit

Independency orCombining





5-19


Figure 5-13 RF cable connections of S7 (Transmit Independency or Combining)/S8 (TransmitIndependency or Combining)

5.6 RF Cable Connections of the GRFUsOne end of the RF jumper is connected to the RF port on the GRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

RF Cable ConnectionsThe RF cables differ from each other in colors. Figure 5-14 shows the mapping between the RFsignal cables and their colors.






The Sending Receiving Mode of the GRFU is set on the BSC side. Table 5-7 describes thetypical configurations of the Sending Receiving Mode for the GRFU.

Table 5-7 Typical configurations of the sending receiving mode

GRFU Configuration Sending Receiving Mode

Single module Double Feeder (1TX + 2RX)

Two interconnected modules Single Feeder (1TX + 2RX)

The other available Sending Receiving Mode for the GRFU are Single Feeder (1TX + 1RX)and Double Feeder (1TX + 1RX). Figure 5-15 shows cable connections.

Figure 5-15 RF cable connections (1)

Cell Configuration with a Single GRFUWhen a dual-polarized antenna is configured, one TX channel and two RX channels are used.The ANT_RXB and ANT_TX/RXA ports receive the signals from the antenna to achieve RXdiversity.



5-21



Cell Configuration with Two GRFUsThe ANT_TX/RXA port on each GRFU supports the receiving and transmitting of signals. TwoGRFUs provide RX signals for each other through the RF interconnection ports. Thus, the RXdiversity is implemented.







5.7 RF Cable Connections for the Coexistence of the DRFUsand GRFUs

One end of the RF jumper is connected to the RF port on the RFU, and the other end is connectedto the feeder. You can determine the appropriate RF ports based on the actual networking modes.

NOTEThe DRFU is categorized into the DRFU GSM900 and DRFU GSM1800. The cable connections of thetwo types are all the same. This section takes the DRFU GSM900 as an example.

RF Cable ConnectionsThe RF cables differ from each other in colors. Figure 5-18 shows the mapping between the RFsignal cables and their colors.



5-23


Single Antenna System Configured With One DRFU and One GRFUWhen a DRFU and a GRFU share a dual-polarized antenna, the typical configuration of theSending Receiving Mode for the DRFU and GRFU is as follows:

l The DRFU is configured with Single Feeder (1TX + 2RX).l The GRFU is configured with Single Feeder (1TX + 2RX).



GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX

ETH FE0 FE1 USB E1/T1 RS T

EX T-ALM1 EX T-ALM0

PWR

MON0MON1

EX T-ALM1 EX T -ALM0 MON0MON1UPEU

LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX

TX3 RX3 TX4 RX4 TX5 RX5

ANT





Double Antenna Systems Configured with One DRFU and One GRFUWhen a DRFU and a GRFU share two dual-polarized antennas, the typical configuration of theSending Receiving Mode for the DRFU and GRFU is as follows:

l The DRFU is configured with Double Feeder (2TX + 2RX).l The GRFU is configured with Double Feeder (1TX + 2RX).



Double Antenna Systems Configured with Two DRFUs and One GRFUWhen two DRFUs and a GRFU share two dual-polarized antennas, the typical configuration ofthe Sending Receiving Mode for the DRFUs and GRFU is as follows:



5-25

l The DRFUs are configured with Single Feeder (1TX + 2RX).l The GRFU is configured with Double Feeder (1TX + 2RX).



5.8 CPRI-Based TopologiesMultiple CPRI-based topologies such as chain, star, and ring are supported for communicationbetween BBUs and RF modules.

Topologies

Figure 5-22 shows CPRI-based topologies supported for communication between BBUs andRF modules.





Figure 5-22 CPRI-based topologies

NOTERXU in the preceding figure indicates an RFU or RRU.

Table 5-8 describes characteristics of the three topologies in the preceding figure.



5-27

Table 5-8 Characteristics of the three topologies

Topology

Advantage Disadvantage Remarks

Chain The transmissionequipment cost is low.

l The number ofcascading levels in achain and the cascadingdistance are restricted.

l Faults in an upper-levelRF module may affectlower-level RFmodules.

l This topology isapplicable toscenarios wherecapacity is large.

l RFUs and RRUscannot be cascaded.

Star l Installation andmaintenance are easy.

l Transmissionreliability is high.When an RF module oroptical cable is faulty,only one sector isaffected.

Compared with othertopologies, this topologyrequires large number ofoptical cables.

This topology isapplicable to scenarioswhere capacity is small.

Ring Transmission reliability isguaranteed.

l The number ofcascading levels in achain and the cascadingdistance are restricted.

l Faults in an upper-levelRRU may affect lower-level RRUs.

l Only RRUs can beused in the ringtopology.

l The ring topology isimplemented byadding a redundantchain to a chaintopology.

Based on the distance between a BBU and an RRU, CPRI networking is classified into short-distance remote networking and long-distance remote networking.

l For the short-distance remote networking, the longest distance between an RRU and a BBUon a CPRI chain does not exceed 100 m.

l For the long-distance remote networking, the longest distance between an RRU and a BBUon a CPRI chain ranges from 100 m to 40,000 m.

Different CPRI optical cables are used in the two types of networking. For details, see chapterCPRI Optical Cable in the BBU3900 Hardware Description.

CPRI Interface SpecificationsTable 5-9 lists the specifications of CPRI ports on the GTMU board.





Table 5-9 Specifications of CPRI ports on the GTMU board

Board Numberof CPRIPorts

Data Rate Topology Number ofSupported TRXs

GTMU 6 1.25 (Gbit/s)

Star, chain, or ring 36

GTMUb 6 1.25/2.5(Gbit/s)

Star, chain, or ring 36

Table 5-10 lists the specifications of CPRI ports on different RF modules.

Table 5-10 Specifications of CPRI ports on different RF modules

RFModule

Number ofCPRIPorts

Data Rate Topology Number ofCarriersSupported

CascadingLevels

MaximumDistancefromtheBBU

DRFU 2 1.25 (Gbit/s) Star or chain 2 3 levels -

GRFU 2 1.25 (Gbit/s) Star or chain 6 2 levels -

RRU3004

2 1.25 (Gbit/s) Star, chain, orring

2 6 levels 40 km

RRU3008

2 1.25 (Gbit/s) Star, chain, orring

6 6 levels 40 km



5-29

6 Antenna System

The antenna system consists of antennas, feeders, jumpers, the Tower Mounted Amplifier(TMA), the Bias Tee (BT), and the GSM Antenna and TMA Control Module (GATM). Ittransmits and receives RF signals.

AntennaAntennas are used to radiate and receive radio waves. The working principle of antennas is asfollows: RF signals output from a radio transmitter are transmitted to antennas over feeders.After receiving the signals, the antennas transmit them to a destination in the form ofelectromagnetic waves. At the destination, antennas receive the electromagnetic waves, convertthem into RF signals, and transmit the signals to a radio transmitter over feeders. A remotecontrol (RC) can control the downtilt of the remote electric tilt (RET) antennas remotely.

Feeders and JumpersFeeders and jumpers are used to transmit RF signals between antennas and radio transmitters atminimum loss.

TMAThe TMA is a low noise amplifier that is installed close to antennas. One end of the TMA isconnected to an antenna port on an RF module while the other end is connected to antennas. Byamplifying weak signals received by antennas, the TMA helps improve receive sensitivity ofthe BTS, expand the uplink coverage, and lower transmit power of MSs.

BTThe BT couples the On-Off-Keying (OOK) signals or RF signals into the passive componentsof feeders.

GATMThe GATM must be configured if the DRFU, RET antennas, and TMA are configured. Functionsof the GATM are as follows:

l Control RET antennas.l Feed power to the TMA.

3900 Series GSM Base StationTechnical Description 6 Antenna System


6-1

l Report RET control alarms.l Monitor the current designated for the TMA.

6 Antenna System3900 Series GSM Base Station




7 Operation and Maintenance

About This Chapter

Operation and Maintenance (OM) covers management, monitoring, and maintenance of thesoftware, hardware, and configuration of the BTSs. In addition, diversified OM modes areprovided in various scenarios.

7.1 OM Modes of the BTSThe OM modes of the BTS consist of the Site Maintenance Terminal mode, Local MaintenanceTerminal mode, and centralized network management mode.

7.2 OM Functions of the BTSThe OM functions of the BTS consist of equipment management, software management,configuration management, service management, performance management, securitymanagement, alarm management, and environment monitoring.

3900 Series GSM Base StationTechnical Description 7 Operation and Maintenance


7-1

7.1 OM Modes of the BTSThe OM modes of the BTS consist of the Site Maintenance Terminal mode, Local MaintenanceTerminal mode, and centralized network management mode.

Figure 7-1 shows the components of the BTS OM system.

Figure 7-1 Network structure of the OM system

You can maintain the BTS in the following modes:

l Site Maintenance Terminal mode: The Site Maintenance Terminal is locally connected tothe BTS through the Ethernet. You can use the Site Maintenance Terminal to operate andmaintain the site, cell, Radio Carrier (RC), Baseband Transceiver (BT), channel, and board.In this mode, only one BTS can be maintained at a time.

l LMT mode: The LMT is used to maintain the BTS through the OM links on the Abisinterface, which is an interface between the BSC and the BTS. The LMT communicateswith the BSC through a LAN. You can use the LMT to operate and maintain the site, cell,RC, channel, and board. This mode is used in configuring and modifying the data of theBSC and BTS.

l Centralized network management mode: The Huawei iManager M2000 is used to maintainthe BTS through the BSC. The M2000 can operate and maintain the site, cell, channel, andboard. In this mode, multiple BTSs can be maintained at a time.

Table 7-1 lists the functions of the BTS OM system.

7 Operation and Maintenance3900 Series GSM Base Station




Table 7-1 Functions of the BTS OM system

MaintenanceObject

MaintenanceItems for the SiteMaintenanceTerminal

Maintenance Items forthe LMT

MaintenanceItems for theM2000

Maintainingsites

Viewing resourcesPerforming siteOpstartTesting the RFspecificationsProviding sitemanagement rightsForcibly loadingsoftwareActivating softwareResetting a sitehierarchicallyTesting sitesMonitoringenvironmentTesting transportperformanceQuerying the ringtopologyparametersQuerying the barcodesQuerying alarmdelay timeManaging the siteboard parametersProviding theopticaltransmission boardcommand consoleTesting the E1 BERManaging the RETantenna

Downloading the BTSsoftware

Configuring the BTSsoftware

Loading the BTS software

Activating NodeB software

Querying BTS runningstatus

Querying BTS attributes

Resetting BTSshierarchically

Browsing the BTSinitialization progress

Querying the softwareversion running on the BTS

Testing the BTS

Monitoring BTS resources

Monitoring environment

Viewing BTS logs

Testing transportperformance

Performing the BTS hardreset

Providing the opticaltransmission boardcommand console

Querying the temperature inthe equipment room

Maintaining the ringnetwork

Managing thereporting ofperformance dataManaging NE usersMonitoring NE statusCentralizing usermanagementMonitoring NEperformanceMonitoring NEs inreal timeViewing fileinformation of NEs



7-3

MaintenanceObject




Maintainingcells

Managing cellattributesManaging cellextended attributesPerforming cellOpstartPerforming cellperformance testsModifying theadministrative stateof the cell

Modifying theadministrative statePerforming force handoversSending cell systemmessagesQuerying frequencyscanningConfiguring frequencyscanning

Viewing the statisticsof the celldistributionViewing the basicconfiguration of thecellViewing theconfiguration of theCCH of a cellViewing neighborcellsMonitoring theconfiguration of anobjectCollecting the alarmsof the monitoredobjectBlocking/unblockingcells

MaintainingBT

Performing BTOpstartRe-Initializing aBTSetting the TRXfull power emissionModifying theadministrative stateof the BTPerforming BTtestsViewing thechannel status

- -





MaintenanceObject




MaintainingRC

Managing RCattributesManaging RCextended attributesPerforming RCOpstartRe-Initializing anRCModifying theadministrative stateof the RCViewing theautomatic powercorrection typeObtaining thepower mode of theRC

Modifying theadministrative stateTesting the RC performanceViewing the power mode ofthe RCViewing the automaticpower correction typeConducting loopback testson the RCTesting idle timeslotsTesting codec modesResetting RCsControlling the RC power

-

Maintainingchannels

Managing channelattributesPerforming channelOpstartModifying theadministrative stateof the channelPerformingloopback tests

Modifying theadministrative stateMonitoring the channelstatusMonitoring the channelinterference bandPerforming the loopbacktest on a channelTesting the channelperformance

Viewing the basicconfiguration of thecellViewing theconfiguration of theCCH of a cell



7-5

MaintenanceObject




Maintainingboards

Configuring racksConfiguring boardsManaging boards

Querying the softwareversion running on theboardQuerying the matching ofboardsQuerying bar codes ofboardsQuerying board informationMaintaining clocksResetting boardsPerforming switchover ofboardsQuerying the power modulestatusResetting smoke alarmsManaging batteriesSetting/Querying powermodule parametersPerforming the loopbacktest on boardcommunication linksQuerying the cavity stateand the cavity frequencySetting the TMA feederResetting the auxiliaryequipmentMaintaining the RETantenna

Viewing NE boardreportsQuerying inventorydata

7.2 OM Functions of the BTSThe OM functions of the BTS consist of equipment management, software management,configuration management, service management, performance management, securitymanagement, alarm management, and environment monitoring.

Equipment Management

Provides the query function for the status of all the components (boards/modules) and all theexternal devices (power supply/environment monitoring/RET). You can also perform dataconfiguration and status management for some devices.





Software ManagementProvides various functions, such as downloading and activating the BTS software, upgradingpatches, and loading and downloading files. The associated tasks involve consistency check onthe software and hardware releases, release management, and software upgrade.

Configuration Managementl Checks whether the added, deleted, or changed BTS data is consistent with the actual

situation.l Supports automatic data backup.l Supports dynamic and static data configuration. In dynamic data configuration, the data

immediately takes effect after modification; in static data configuration, the modified datatakes effect after the BTS is reset.

Service Managementl Supports parameter setting and alarm query for the baseband boards and environment

monitoring devices.l Supports complete self-test on hardware installation. The BTS software can be upgraded

through the software package saved in the USB disk; thus, shortening the upgrade period.In addition, the local commissioning is not required.

Performance Managementl Monitors the performance of the internal and external telecommunications networks and

generates alarms when the performance deteriorates.l Monitors the operating status of the BTS, such as monitors the traffic volume on the ports

and measures the technical data of the BTS.l Monitors the usage of key components in the board, such as the CPU and DSP.

Security ManagementProvides security management functions, such as connection management, user authentication,encryption, and forward and backward resolution of the interface messages between the BTSsoftware and the OMC.

Alarm Managementl Supports query of real-time alarms and history alarmsl Collects internal and external alarms, such as the environment monitoring device inputs

and Boolean inputsl Processes alarm correlation to ensure precision and accuracy in locating alarmsl Provides functions of saving, interpreting, prompting, shielding, filtering, confirming,

clearing, post processing, and reporting of alarmsl Provides functions of detecting and reporting alarms, and processing alarm correlation in

the system

Environment Monitoringl Provides a perfect environment monitoring system.



7-7

l Provides monitoring solutions regarding, for example, door control, infrared, smoke, waterimmersion, and temperature, according to users' requirements.





8 External Reference Clock Sources

The BTS supports multiple external reference clock sources, including the IP reference clock,E1/T1 reference clock, synchronous Ethernet reference clock, BITS reference clock, and GPS/RGPS reference clock. If a BTS fails to obtain clock signals, it works in free-run mode for acertain period of time.

IP Reference Clock

When a BTS works in IP over FE mode, it obtains clock signals from an IP reference clock. Inthis case, an IP clock server must be configured. The server sends the User Datagram Protocol(UDP) packets carrying reference clock information to the BTS. After receiving the packets, theBTS interprets clock signals from the packets and then synchronizes its clock system.

E1/T1 Reference Clock

The BBU obtains clock signals from an E1/T1 port. Then, the BBU performs frequency division,phase locking, and phase adjustment on the clock module to export 2 MHz and 8 kHz clocksignals for bit synchronization and frame synchronization. An E1/T1 reference clock obtainsclock signals from the BSC or transport network. The BTS can obtain clock signals from theBSC using an E1/T1 port. If the BTS adopts IP transmission mode but an IP reference clock isunavailable, the BTS uses an E1/T1 port to obtain clock signals from the transport network.

Synchronous Ethernet Reference Clock

When the BTS works in IP over FE mode and the transport network supports the synchronousEthernet reference clock, the BTS obtains Ethernet clock signals from the transport network.

BITS Reference Clock

When the BBU is configured with the USCU board, the GTMU board obtains external BITSclock signals from the USCU board.

GPS/RGPS Reference Clock

When the BBU is configured with the USCU board, the GTMU board obtains external GPS/RGPS clock signals from the USCU board.

3900 Series GSM Base StationTechnical Description 8 External Reference Clock Sources


8-1

Free-Run ClockIn the absence of external clocks, the internal free-run clock ensures that the BTS keeps workingproperly for at least ninety days.

8 External Reference Clock Sources3900 Series GSM Base Station




9 Surge Protection Specifications

This section provides surge protection specifications for the BBU, RF modules, and each typeof base stations.

NOTE

l Unless otherwise specified, the surge protection specifications depend on the surge waveform of 8/20 μs.

l All the surge current items, unless otherwise specified as Maximum discharge current, refer to Nominaldischarge current.

Surge protection specifications for the ports on the BTS3900Table 9-1 lists the surge protection specifications for the ports on the BTS3900.

Table 9-1 Surge protection specifications for the ports on the BTS3900

Port Surge Protection Mode Specification

DC power supplyport

Surge Differentialmode

2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

AC power supplyport


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surge current Differentialmode

5 kA

Commonmode

5 kA

Surge protection specifications for the ports on the BTS3900LTable 9-2 describes the surge protection specifications for the ports on the BTS3900L.

3900 Series GSM Base StationTechnical Description 9 Surge Protection Specifications


9-1

Table 9-2 Surge protection specifications for the ports on the BTS3900L

Port Surge Protection Mode Specification

DC power supplyport


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surge protection specifications for the ports on the BTS3900A

Table 9-3 describes the surge protection specifications for the ports on the BTS3900A.

Table 9-3 Surge protection specifications for the ports on the BTS3900A

Port ApplicationScenario

Surge Protection Mode Specification

-48 V DC outputremote port

Allscenarios

Surgecurrent

Differentialmode

10 kA

Commonmode

20 kA

-48 V DC inputport

Transmissioncabinets,batterycabinets, ortheBTS3900A (DC) isused.


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

10 kA

Commonmode

20 kA

Only RFCcabinetsare used.


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

3 kA

Commonmode

5 kA

AC power supplyport

Remoteoutdoors orcompletelyoutdoors


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

9 Surge Protection Specifications3900 Series GSM Base Station






Surgecurrent

Differentialmode

40 kA

Commonmode

40 kA

Surge protection specifications for the ports on the BBU3900

Table 9-4 describes the surge protection specifications for the ports on the BBU3900.

Table 9-4 Surge protection specifications for the ports on the BBU3900



-48 V DCport

Indoors Differential mode 2 kV (1.2/50 μs)

Common mode 4 kV (1.2/50 μs)

24 V DCport

Indoors Differential mode 2 kV (1.2/50 μs)


FE/GE port Indoors Differential mode 0.5 kV (1.2/50 μs)




1 kV (1.2/50 μs)

Commonmode

2 kV (1.2/50 μs)

Surgecurrent

Differentialmode

1 kA per line

Commonmode

6 kA (8 lines)

GPS port Remoteoutdoors orcompletelyoutdoors

Onboardsurge

Differentialmode

250 A

Surgeprotectorconfigured

Differentialmode

8 kA

Commonmode

40 kA

RGPS port Remoteoutdoors or

Onboardsurge

Differentialmode

250 A



9-3



completelyoutdoors

Commonmode

250 A

Surgeprotectionmoduleconfigured

Differentialmode

3 kA

Commonmode

5 kA

E1/T1 port Indoors Onboardsurge

Differentialmode

250 A

Commonmode

250 A


Surgeprotectionboxconfigured

Differentialmode

3 kA

Commonmode

5 kA

Dry contact Indoors Onboardsurge

Differentialmode

250 A


Surgeprotectionboardconfigured

Differentialmode

3 kA

Commonmode

5 kA

RS485 port Indoors Onboardsurge

Differentialmode

250 A

Commonmode

250 A


Surgeprotectionboardconfigured

Differentialmode

3 kA

Commonmode

5 kA

Surge protection specifications for the ports on RF modulesTable 9-5 describes the surge protection specifications for the ports on the RRU3004 orRRU3008 V1.





Table 9-5 Surge protection specifications for the ports on the RRU3004 or RRU3008 V1

Port Application Scenario


DC powersupply port

Allscenarios


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

10 kA

Commonmode

20 kA

AC powersupply port

Indoors Surge Differentialmode

2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

5 kA

Commonmode

5 kA



2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

40 kA

Commonmode

40 kA

Antenna port Allscenarios

Surgecurrent

Differentialmode

8 kA

Commonmode

40 kA

CPRI port Allscenarios

Surge 250 A

RGPS port Allscenarios

Surgecurrent

Differentialmode

3 kA

Commonmode

5 kA

AISG RETantenna port

Allscenarios

Surgecurrent

Differentialmode

3 kA



9-5



Commonmode

5 kA

Dry contactor RS485port

Allscenarios

Surgecurrent

Differentialmode

250 A

Commonmode

250 A

I2C port on alocal powermonitoringdevice andalarm port

Batteriesundermonitoringand RRUsare installedback toback or thedistancebetweenthem isshorter than1 m.

Surge 250 A

Table 9-6 describes the surge protection specifications for the ports on the DRFU, GRFU, orRRU3008 V2.

Table 9-6 Surge protection specifications for the ports on the DRFU, GRFU, or RRU3008 V2



DC powersupply port

Allscenarios


2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

10 kA

Commonmode

20 kA

AC powersupply port

Indoors Surge Differentialmode

2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

5 kA







Commonmode

5 kA



2 kV (1.2/50 μs)

Commonmode

4 kV (1.2/50 μs)

Surgecurrent

Differentialmode

40 kA

Commonmode

40 kA

Antenna port Allscenarios

Surgecurrent

Differentialmode

8 kA

Commonmode

40 kA

CPRI port Allscenarios

Surge 250 A

RGPS port Allscenarios

Surgecurrent

Differentialmode

3 kA

Commonmode

5 kA

RET antennaport

Allscenarios

Surgecurrent

Differentialmode

3 kA

Commonmode

5 kA

Dry contactor RS485port

Allscenarios

Surgecurrent

Differentialmode

3 kA

Commonmode

5 kA

I2C port on alocal powermonitoringdevice andalarm port

Batteriesundermonitoringand RRUsare installedback toback or thedistancebetweenthem isshorter than1 m.

Surge 250 A



9-7





3900 Series GSM Base Station Technical Description(V100R013_Draft a)

Documents

1tx 2rx

1tx 1rx

2tx 2rx

2tx 4rx

edge modular

macro base

signal processing

functional