3900 Series GSM Base Station Technical Description(V100R013_03)(PDF)-En

3900 Series GSM Base Station V100R013

Technical Description Issue

03

Date

2011-08-30

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 written consent 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.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase 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 representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

Issue 03 (2011-08-30)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

3900 Series GSM Base Station Technical Description

About This Document

About This Document

Overview This document provides information about 3900 series GSM base stations such as system principles, operation and maintenance, clock synchronization schemes, and surge protection specifications, aiming to enable operators to comprehensively understand functions of the 3900 series GSM base stations.

Product Version The 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 Audience This document is intended for: l

Network planners

l

Field engineers

l

System engineers

Organization 1 Changes in the 3900 Series GSM Base Station Technical Description Issue 03 (2011-08-30)


ii


About This Document

This section describes changes in the 3900 Series GSM Base Station Technical Description of each version. 2 Overview 3900 series base stations adopt the cutting-edge modular design for different modes and are managed by various systems. With simple components, they can be installed and deployed easily and fast. With comprehensive functions and remarkable performance, they can meet requirements in various scenarios. In addition, they are diversified by flexibly combining functional modules and auxiliary devices. 3 BTS System Principle The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Its functional subsystem includes the control system, transport system, monitoring system, RF system, 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 system manages the entire BTS system in a centralized manner, including signaling processing, operation and maintenance, and system clock. The transport system provides physical ports connecting 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 in distributed 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). It transmits and receives RF signals. 7 Operation and Maintenance Operation and Maintenance (OM) covers management, monitoring, and maintenance of the software, hardware, and configuration of the BTSs. In addition, diversified OM modes are provided 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 a certain period of time. 9 Surge Protection Specifications This section provides surge protection specifications for the BBU, RF modules, and each type of base stations.

Conventions Symbol Conventions The symbols that may be found in this document are defined as follows. Issue 03 (2011-08-30)


iii


About This Document

Symbol

Description Indicates a hazard with a high level of risk, which if not avoided, will result in death or serious injury. Indicates a hazard with a medium or low level of risk, which if not avoided, could result in minor or moderate injury. Indicates a potentially hazardous situation, which if not avoided, could result in equipment damage, data loss, performance degradation, or unexpected results. Indicates a tip that may help you solve a problem or save time. Provides additional information to emphasize or supplement important 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 in boldface. For example, log in as user root.

Italic

Book titles are in italics.

Courier New

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

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

Issue 03 (2011-08-30)

Convention

Description

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 by vertical bars. One item is selected.

[ x | y | ... ]

Optional items are grouped in brackets and separated by vertical bars. One item is selected or no item is selected. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

iv


About This Document

Convention

Description

{ x | y | ... }*

Optional items are grouped in braces and separated by vertical bars. A minimum of one item or a maximum of all items can be selected.

[ x | y | ... ]*

Optional items are grouped in brackets and separated by vertical 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. Convention

Description

Boldface

Buttons, menus, parameters, tabs, window, and dialog titles are 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 means the two keys should be pressed in turn.

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

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Action

Description

Click

Select and release the primary mouse button without moving the pointer.

Double-click

Press the primary mouse button twice continuously and quickly without moving the pointer.

Drag

Press and hold the primary mouse button and move the pointer to a certain position. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

v


Contents

Contents About This Document.....................................................................................................................ii 1 Changes in the 3900 Series GSM Base Station Technical Description...............................1 2 Overview.........................................................................................................................................4 3 BTS System Principle...................................................................................................................8 4 Control and Transport Systems................................................................................................10 4.1 Logical Structure of the BBU...........................................................................................................................11 4.2 BBU Transmission Ports..................................................................................................................................12 4.3 Transport Network Topologies.........................................................................................................................13

5 RF System......................................................................................................................................18 5.1 Logical Structure of the RRU...........................................................................................................................19 5.2 Logical Structure of the RFU...........................................................................................................................22 5.3 CPRI-Based Topologies...................................................................................................................................24 5.4 RRU3004 Configuration...................................................................................................................................28 5.5 Configurations of RRU3008, RRU3908, RRU3928, and the MRFUd............................................................33 5.6 DRFU Configuration........................................................................................................................................40 5.7 Configurations of the GRFU/MRFU/MRFUe..................................................................................................49

6 Antenna System...........................................................................................................................56 7 Operation and Maintenance......................................................................................................58 7.1 OM Modes of the BTS.....................................................................................................................................59 7.2 OM Functions of the BTS................................................................................................................................59

8 External Reference Clock Sources............................................................................................62 9 Surge Protection Specifications................................................................................................64

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1

1 Changes in the 3900 Series GSM Base Station Technical Description

Changes in the 3900 Series GSM Base Station Technical Description This section describes changes in the 3900 Series GSM Base Station Technical Description of each version.

03 (2011-08-30) This is issue 03. Compared with issue 02 (2011-06-25), this issue does not include any new topics. Compared with issue 02 (2011-06-25), this issue incorporates the following changes: Topic

Description

5.7 Configurations of the GRFU/MRFU/ MRFUe

Information about the MRFU V3 is added.

5.3 CPRI-Based Topologies

Information about the MRFU V3 is added.

9 Surge Protection Specifications

Information about the MRFU V3 is added. VER.B of the cabinet is added.

Compared with issue 02 (2011-06-25), this issue does not exclude any topics.

02 (2011-06-25) This is issue 02. Compared with issue 01 (2011-04-30), this issue includes the following new topic: l

Configurations of RRU3008, RRU3908, RRU3928, RRU3929, and the MRFUd

l

5.7 Configurations of the GRFU/MRFU/MRFUe

Compared with issue 01 (2011-04-30), this issue incorporates the following changes: Issue 03 (2011-08-30)


1



Topic

Description

5.1 Logical Structure of the RRU

Information about the RRU3929 is added.

5.2 Logical Structure of the RFU

Information about the MRFUe is added.


Information about the RRU3929, MRFUe is added.


Surge protection specifications for the ports on the RRU3929, MRFUe are added.

Compared with issue 01 (2011-04-30), this issue excludes the following topic: l

Configurations of RRU3008, RRU3908, RRU3928, GRFU, MRFU, and the MRFUd

01 (2011-04-30) This is issue 01. Compared with issue 07 (2011-03-30) of V100R012, this issue includes the following new topics: l

2 Overview

l

3 BTS System Principle

l

4.2 BBU Transmission Ports

l

5.2 Logical Structure of the RFU

l

5.5 Configurations of RRU3008, RRU3908, RRU3928, and the MRFUd

l

5.7 Configurations of the GRFU/MRFU/MRFUe

l

6 Antenna System

l

7 Operation and Maintenance

Compared with issue 07 (2011-03-30) of V100R012, this issue incorporates the following changes: Topic

Description

5.1 Logical Structure of the RRU

Information about the RRU3908 and RRU3928 is added.


Information about the MRFU, MRFUd, RRU3908, and RRU3928 is added.


Surge protection specifications for the ports on the BTS3900 (Ver.C), BTS3900L (Ver.C), BTS3900A (Ver.C), MRFU, MRFUd, RRU3908, and RRU3928 are added.

Compared with issue 07 (2011-03-30) of V100R012, this issue excludes the following topics: Issue 03 (2011-08-30)


2



l

DBS3900 Product Family

l

System Architecture of the BTS3900

l

System Architecture of the BTS3900A

l

System Architecture of the BTS3900L

l

Software Structure of the BTS

l

Logical Structure of the BTS3900

l

Logical Structure of the BTS3900L

l

Logical Structure of the BTS3900A

l

DBS3900 Monitoring Schemes

l

BTS3900 Monitoring System

l

BTS3900A Monitoring System

l

BTS3900L Monitoring System

l

Signal Flow of the BTS3900/BTS3900A

l

Signal Flow of the BTS3900L

l

Configuration of the BTS3900/BTS3900A

l

Configuration of the BTS3900L

l

CPRI Cable Connections of the RRUs

l

RRU3008 Configuration

l

Typical Scenarios of the DBS3900 (with the DC RRU)

l

Typical Scenarios of the DBS3900 (with the AC RRU)

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2 Overview

2

Overview

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

BTS in the BSS The base station subsystem (BSS) mainly consists of the base station controller (BSC) and the base transceiver station (BTS), as shown in Figure 2-1.

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2 Overview

Figure 2-1 BSS architecture

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

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Nam e

Type

Usage Scenario

Input Power

Cabinet Combination

Reference

BTS 3900

Indoo r macro base statio n

Indoor installation scenarios where traffic load is heavy, lease cost of equipment room is high, or equipment room is spacelimited.

l -48 V DC

l Single cabinet

For information about usage scenarios and configurations of cabinets, see BTS3900(Ver.B) Hardware Description and BTS3900(Ver.C) Hardware Description.

l +24 V DC l 220 V AC l 110 V AC

l Double cabinets: Two cabinets are installed side by side or two cabinets are stacked.


5


Nam e

Type

Usage Scenario

Input Power

Cabinet Combination

Reference

BTS 3900 A

Outdo or macro base statio n

Outdoor installation scenarios where wide coverage is required such as cities, suburbs, or rural areas.

l -48 V DC

l TMC11H + RFC

l 220 V AC

l APM30H + RFC (+IBBS + TMC11H)

APM30H is a power cabinet, the RFC is a radio frequency cabinet, TMC11H is a transmission cabinet, and the IBBS is a battery cabinet. For information about usage scenarios and configurations of cabinets, see BTS3900A (Ver.B) Hardware Description and BTS3900A (Ver.C) Hardware Description.

Indoo r macro base statio n

Indoor installation scenarios with large capacity where traffic load is heavy, lease cost of equipment room is high, or equipment room is space-limited.

-48 V DC

BTS 3900 L

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2 Overview

l 110 V AC

Single cabinet


For information about usage scenarios and configurations of cabinets, see BTS3900(Ver.B) Hardware Description and BTS3900(Ver.C) Hardware Description.

6


2 Overview

Nam e

Type

Usage Scenario

Input Power

Cabinet Combination

Reference

DBS 3900

Distri buted base statio n

Outdoor installation scenarios where site deployment is difficult and wide coverage is required.

l -48 V DC

l BBU + APM30H + RRU

APM30H is a power cabinet, TMC11H is a transmission cabinet, the OMB is an outdoor mini box, the ICR is an indoor centralized rack, and IMB03 is an indoor mini box. For information about usage scenarios and configurations of cabinets, see DBS3900(Ver.B) Installation Guide, DBS3900 (Ver.C) Installation Guideand DBS3900 (ICR) Installation Guide.

l +24 V DC l 220 V AC

l BBU + TMC11H + RRU l BBU + 19inch rack + RRU l Indoor wallmounted BBU + RRU l BBU + OMB + RRU l BBU + ICR + RRU l BBU + IMB03 + RRU

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3

BTS System Principle

The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Its functional subsystem includes the control system, transport system, monitoring system, RF system, 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: Managing the entire BTS system in a centralized manner, including operation and maintenance, signaling processing, and system clock. For details, see section 4 Control and Transport Systems.

l

Transport system: Providing physical ports connecting the BTS and the transport network and also provides maintenance channels connecting the BTS and the Operation and

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

Monitoring system: Collecting external alarm information and reporting the information to the control system. For details, see chapter Monitoring System in the Hardware Description of the corresponding base station type.

l

RF system: Processing RF and baseband signals. For details, see section 5 RF System.

l

Antenna system: Receiving uplink signals and transmitting downlink signals. For details, see section 6 Antenna System.

l

Power supply system: Obtaining power from external power supply devices and providing power for other subsystems of the BTS. For details, see chapter Power System in the Hardware Description of the corresponding base station type.

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4 Control and Transport Systems

4

Control and Transport Systems

About This Chapter The functions of the control and transport systems are provided by the BBU. The control system manages the entire BTS system in a centralized manner, including signaling processing, operation and maintenance, and system clock. The transport system provides physical ports connecting the BTS and the transport network. 4.1 Logical Structure of the BBU The BBU consists of the main processing unit, BTS interface unit, high-speed interface unit, clock unit, and monitoring unit. 4.2 BBU Transmission Ports The GTMU or UTRP board provides transmission ports to enable information exchange between the BTS and the transport network. 4.3 Transport Network Topologies Transport network topologies include TDM, IP, and High level Data Link Control (HDLC) network topologies. In reality, these topologies are combined to save transmission device costs without deteriorating service quality.

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4.1 Logical Structure of the BBU The 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 of the BTS interface unit and high-speed interface unit.

Main Processing Unit The main processing unit manages the entire BTS system in a centralized manner, including operation and maintenance, signaling processing, and system clock. It provides the following functions: l

Supports such protocols as UART, HDLC, and IP over FE.

l

Controls the BTS interface unit to enable communication between the BBU and the BSC.

l

Controls the High-speed interface unit to enable communication between the BBU and RF modules.

l

Provides system clock for the BTS and obtains external clock signals.

BTS Interface Unit The BTS interface unit enables information exchange between the BTS and the transport network by providing the following functions: l

Connects the BTS with the BSC.

l

Exchanges data between the E1 link and the DBUS.

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l


Synchronizes 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 modules by providing the following functions: l

Receives the uplink baseband data from RF modules.

l

Transmits the downlink baseband data to RF modules.

Clock Unit The clock unit provides the following functions: l

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

l

Checks the phase-locked status, provides phase lock for the software, adjusts DA, and generates frame numbers.

Monitoring Unit The monitoring unit collects external alarms and reports the alarms to the central processing unit.

4.2 BBU Transmission Ports The GTMU or UTRP board provides transmission ports to enable information exchange between the 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 Transmission Mode

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 over FE optical ports

GTMU/GTMUb

1

10 Mbit/s or 100 Mbit/s

Transmission over FE electrical ports

GTMU/GTMUb

1

10 Mbit/s or 100 Mbit/s

NOTE

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

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4.3 Transport Network Topologies Transport network topologies include TDM, IP, and High level Data Link Control (HDLC) network topologies. In reality, these topologies are combined to save transmission device costs without deteriorating service quality.

TDM Network Topology E1/T1 transmission is adopted for communication between the BTS and the BSC while TDM transmission is adopted on the Abis interface. TDM network topology includes such network topologies as chain, star, tree, and ring, as shown in Figure 4-2.

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Figure 4-2 TDM network topology

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

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

Usage Scenario

Advantage

Star

A wild range of areas, especially densely populated areas

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 sparsely populated such as areas along highways and railways

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

Tree

Areas where network architecture, site distribution, and subscriber distribution are complicated such as an area where large-scale coverage overlaps with hot spot areas or small-scale coverage.

Compared with the star topology, this topology requires fewer transmission cables.

Ring

A wild range of areas. Because of its self-healing capability, this topology is recommended when a route is available.

A ring topology can automatically split into two chains if transmission is disrupted at a breakpoint and base stations before and after the breakpoint can still function properly. This improves the system robustness. As shown in Figure 4-3, transmission is disrupted at B. Before disruption, BTSs 0, 1, and 2 are connected in a clockwise direction, forming a ring topology. After disruption, transmission is normal at BTS 0 and BTSs 1 and 2 form a chain topology with BTS 2 being the upperlevel base station.

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

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

HDLC Network Topology E1/T1 transmission is adopted for communication between the BTS and the BSC while HDLC transmission is adopted on the Abis interface. HDLC network topology includes such network topologies as chain, star, and ring, as shown in Figure 4-5.

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Figure 4-5 HDLC network topology

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5 RF System

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 in distributed 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 RRU RRUs include RRU3004, RRU3008, RRU3908, RRU3928, and RRU3929. 5.2 Logical Structure of the RFU The RFU includes the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd, MRFUe and MRFU V3. 5.3 CPRI-Based Topologies Multiple CPRI-based topologies such as chain, star, and ring are supported for communication between BBUs and radio frequency (RF) modules. 5.4 RRU3004 Configuration RRU3004 is a double-transceiver remote radio unit and supports two carriers. Different configurations must be chosen in different topologies. 5.5 Configurations of RRU3008, RRU3908, RRU3928, and the MRFUd RRU3008, RRU3908, and RRU3928 are multi-carrier remote radio units. Each of them supports eight carriers. The MRFUd is a multi-carrier radio frequency (RF) module and supports eight carriers. Different configurations must be chosen in different topologies. 5.6 DRFU Configuration The DRFU is a double-transceiver module and supports two carriers. Different configurations must be chosen in different topologies. 5.7 Configurations of the GRFU/MRFU/MRFUe The GRFU, MRFU V1, MRFU V2, MRFUe, and MRFU V3 are multi-carrier radio frequency (RF) modules. A GRFU or MRFU V1 or MRFU V2 or MRFU V3 supports six carriers, and an MRFUe supports eight carriers. Different configurations must be chosen in different topologies.

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5 RF System

5.1 Logical Structure of the RRU RRUs include RRU3004, RRU3008, RRU3908, RRU3928, and RRU3929. RRU3004 consists of a high-speed interface unit, signal processing unit, power amplifier (PA), low noise amplifier (LNA), and dual duplexer. Figure 5-1 shows the logic structure of RRU3004. Figure 5-1 Logical structure of RRU3004

RXM_OUT: It is a main receive output port and is used RXD_IN: It is a receive diversity input port and is used for RRU interconnecting. for RRU interconnecting.

RRU3008 consists of a main control and high-speed interface unit, signal processing unit, PA, LNA, RX, and dual duplexer. Figure 5-2 shows the logic structure of RRU3008.

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5 RF System

Figure 5-2 Logical structure of RRU3008

RXM_OUT: It is a main receive output port and is used RXD_IN: It is a receive diversity input port and is used for RRU interconnecting. for RRU interconnecting.

RRU3908, RRU3928, or RRU3929 consists of a high-speed interface unit, signal processing unit, PA, LNA, and duplexer. Figure 5-3 shows the logic structures of RRU3908, RRU3928, and RRU3929. Figure 5-3 Logical structures of RRU3908, RRU3928, and RRU3929

High-Speed Interface Unit The high-speed interface unit mainly provides the following functions: Issue 03 (2011-08-30)


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5 RF System

l

Receives data from an upper-level device, such as the BBU.

l

Sends data to an upper-level device, such as the BBU.

l

Transfers data transmitted from cascaded RRUs by using CPRI ports.

Main Control and High-Speed Interface Unit The main control and high-speed interface unit mainly provides the following functions: l

Receives data from an upper-level device, such as the BBU.

l

Sends data to an upper-level device, such as the BBU.

l

Transfers data transmitted from cascaded RRUs by using CPRI ports.

l

Initializes RRU configurations and loads RRU software.

l

Collects alarms and reports board status.

l

Executes configuration commands sent from the BBU and manages configurations of an RRU's other units.

l

Operates and maintains RRUs.

Signal Processing Unit The signal processing unit consists of an uplink receive channel, a downlink transmit channel, and a control module. Moreover, it mainly processes radio frequency (RF) and GSM baseband signals. An uplink receive channel mainly provides the following functions: l

Converts received signals into intermediate frequency analog signals by performing downconversion.

l

Converts intermediate frequency analog signals into digital signals by using an Analog Digit Converter (ADC).

l

Processes intermediate frequency digital signals.

l

Matches filtering.

l

Provides the Digital Automatic Gain Control (DAGC) function.

l

Packs data.

A downlink transmit channel mainly provides the following functions: l

Separates packed signals that are transmitted from the BBU including clock signals, control signals, and data signals. Then, transmits them to specified units.

l

Combines and filters multiple routes of downlink signals.

l

Converts digital signals into analog signals by using a Digit Analog Converter (DAC). Then, performs the Inphase and Quadrature (IQ) modulation.

l

Converts RF signals into signals that can be transmitted in transmit frequency bands by performing up-conversion.

A control module mainly provides the following functions: l

Initializes RRU configurations and loads RRU software.

l

Collects alarms and reports board status.

l

Executes configuration commands sent from the BBU and manages configurations of an RRU's other units.

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l

5 RF System

Operates and maintains RRUs.

PA A PA's major function is to amplify power of multi-carrier and low-power radio frequency (RF) signals that are sent from the signal processing unit.

LNA The LNA performs low noise amplification on signals received by antennas.

RX The RX's major function is to convert signals sent from the LNA into intermediate frequency analog signals by performing down-conversion. Then, it amplifies the intermediate frequency analog signals. Finally, it sends the signals to the ADC.

Duplexer The duplexer and the dual duplexer mainly provide the following functions: l

Filters transmitted or received signals.

l

Multiplexes transmitted and received signals on RF channels. By doing this, signals are transmitted or received using the same antenna channel.

5.2 Logical Structure of the RFU The RFU includes the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd, MRFUe and MRFU V3. The RFU consists of a high-speed interface unit, signaling processing unit, power amplifier (PA), low noise amplifier (LNA), and duplexer. Figure 5-4 shows the logical structure of the DRFU. Figure 5-5 shows the logical structure of the MRFUd. Figure 5-6 shows the logical structures of the GRFU, MRFU V1, MRFU V2, MRFUe and MRFU V3. Figure 5-4 Logical structure of the DRFU

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5 RF System

Figure 5-5 Logical structure of the MRFUd

Figure 5-6 Logical structures of the GRFU, MRFU, MRFUe and MRFU V3

High-Speed Interface Unit The high-speed interface unit mainly provides the following functions: l

Adapts signals sent from the BBU for the signaling processing unit.

l

Adapts signals sent from the signaling processing unit for the BBU.

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Signal Processing Unit The signaling processing unit consists of two uplink receive channels and one downlink transmit channel. An uplink receive channel mainly provides the following functions: l

Converts received high frequency analog signals into intermediate frequency analog signals by performing down-conversion.

l

Amplifies intermediate frequency analog signals and performs the Inphase and Quadrature (IQ) modulation.

l

Converts analog signals into digital signals by using an Analog Digit Converter (ADC).

l

Samples digital signals.

l

Matches filtering.

l

Provides the Digital Automatic Gain Control (DAGC) function.

l

Seals frames.

A downlink transmit channel mainly provides the following functions: l

Processes signals that are transmitted from the BBU including clock signals, control signals, and data signals. Then, transmit them to specified units.

l

Shapes and filters the downlink signals.

l

Converts digital signals into analog signals by using a Digit Analog Converter (DAC). Then, performs the Inphase and Quadrature (IQ) modulation.

l

Converts radio frequency (RF) signals into signals that can be transmitted in transmit frequency bands by performing up-conversion.

PA The PA amplifies low-power RF signals that are sent from the signaling processing unit.

LNA The LNA's major function is to perform low noise amplification on signals received by antennas.

Duplexer The duplexer mainly provides the following functions: l

Multiplexes transmitted and received signals on RF channels.

l

Enables signals to be transmitted or received using the same antenna channel.

l

Filters transmitted or received signals.

5.3 CPRI-Based Topologies Multiple CPRI-based topologies such as chain, star, and ring are supported for communication between BBUs and radio frequency (RF) modules.

Topologies Figure 5-7 shows CPRI-based topologies supported for communication between BBUs and RF modules. The DRFU, GRFU support the chain and star topologies. The RRU3004 and RRU3008 Issue 03 (2011-08-30)


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support the chain, star, and ring topologies. The MRFU V1, MRFU V2, MRFUd, MRFUe, MRFU V3, RRU3908, RRU3928, and RRU3929 support the star topology. Figure 5-7 CPRI-based topologies

NOTE

RXU in the preceding figure indicates an RFU or RRU.

Table 5-1 describes characteristics of the three topologies in the preceding figure.

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Table 5-1 Characteristics of the three topologies Topo logy

Advantage

Disadvantage

Remarks

Chain

The transmission equipment cost is low.

l The number of cascading levels in a chain and the cascading distance are restricted.

l This topology is applicable to scenarios where capacity is large.

l Faults in an upper-level RF module may affect lower-level RF modules.

l RFUs and RRUs cannot be cascaded.

Compared with other topologies, this topology requires large numbers of optical cables.

This topology is applicable to scenarios where capacity is small.

l The number of cascading levels in a chain and the cascading distance are restricted.

l Only RRUs can be used in the ring topology.

Star

l Installation and maintenance are easy. l Transmission reliability is high. When an RF module or optical cable is faulty, only one sector is affected.

Ring

Transmission reliability is guaranteed.

l Faults in an upper-level RRU may affect lowerlevel RRUs.

l The ring topology is implemented by adding a redundant chain to a chain topology.

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

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

l

For the long-distance remote networking, the longest distance between an RRU and a BBU on 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 chapter CPRI Optical Cable in the BBU3900 Hardware Description.

CPRI Specifications Table 5-2 lists the specifications of CPRI ports on the GSM Transmission, Timing, and Management Unit for BBU (GTMU).

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Table 5-2 Specifications of CPRI ports on the GTMU board Board

Number of CPRI Ports

Data Rate

Topology

Number of Supported TRXs

GTMU

6

1.25 Gbit/s

Star, chain, or ring

36

GTMUb

6

1.25/2.5 Gbit/s


36

Table 5-3 lists the specifications of CPRI ports on different RF modules. Table 5-3 Specifications of CPRI ports on different RF modules

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RF Module s

Numb er of CPRI Ports

Data Rate

Topology

Number of Supported Carriers

Cascadi ng Levels

Maxi mum Dista nce from the BBU

DRFU

2

1.25 Gbit/s

Star or chain

2

3 levels

N/A

GRFU

2

1.25 Gbit/s

Star or chain

6

2 levels

N/A

RRU300 4

2

1.25 Gbit/s


2

6 levels

40

RRU300 8

2

1.25 Gbit/s


8

6 levels

40

MRFU V1

2

1.25 Gbit/s

Star

6

N/A

N/A

MRFU V2

2

1.25/2.5 Gbit/s

Star

6

N/A

N/A

MRFU V3

2

1.25/2.5 Gbit/s

Star

6

N/A

N/A

MRFUd

2

1.25/2.5 Gbit/s

Star

8

N/A

N/A

MRFUe

2

1.25/2.5 Gbit/s

Star

8

N/A

N/A

RRU390 8 V1

2

1.25 Gbit/s

Star

6

N/A

40

RRU390 8 V2

2

1.25/2.5 Gbit/s

Star

8

N/A

40


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RF Module s

Numb er of CPRI Ports

Data Rate

Topology

Number of Supported Carriers

Cascadi ng Levels

Maxi mum Dista nce from the BBU

RRU392 8

2

1.25/2.5 Gbit/s

Star

8

N/A

40

RRU392 9

2

1.25/2.5 Gbit/s

Star

8

N/A

40

5.4 RRU3004 Configuration RRU3004 is a double-transceiver remote radio unit and supports two carriers. Different configurations must be chosen in different topologies.

Port Table 5-4 describes major ports on RRU3004. Table 5-4 Major ports on RRU3004 Type

Silkscreen

Description

Port for transceiving RF signals

ANT_TX/RXA and ANT_TX/RXB

The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively.

CPRI port

TX RX CPRI_W

The port is a westbound optical/ electrical port and it is used to connect to the BBU or an upper-level RRU.

TX RX CPRI_E

The port is an eastbound optical/ electrical port and it is used to connect to a lower-level RRU.

RX_IN/OUT

The port is used to transmit and receive the diversity signals received through an antenna channel.

Interconnection port for receiving RF signals

Basic Configurations Table 5-5 lists the basic configurations of an RRU3004 serving only one sector. The format of the description of the basic configuration is RF[F][TX][RX]_[C][TYPE]. Where, Issue 03 (2011-08-30)


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l

F indicates the number of antenna channels for an RF module.

l

TX indicates the number of transmit channels for an RF module.

l

RX indicates the number of receive channels for an RF module.

l

C indicates the number of CPRI links connecting RF modules with the GTMU board.

l

TYPE indicates the CPRI network topologies applied to connect RF modules with the BBU. If the value of TYPE is A, the star topology is applied. If the value of TYPE is B, the chain topology is applied.

Table 5-5 Basic configurations Basic Configuration

Number of Modules

Sending Receiving Mode

Hardware Configuration

RF111_1A

1

Single feeder [1TX 1RX]

Figure 5-8

RF211_1A

1

Double feeder [1TX 1RX]

Figure 5-9

RF212_1A

1


Figure 5-10

RF222_1A

1


Figure 5-11

RF112_2B

2


Figure 5-12

RF111_1A An RRU3004 connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. The star topology is applied to connect the BBU with the RRU3004.

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Figure 5-8 RF111_1A

RF211_1A An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals. The star topology is applied to connect the BBU with the RRU3004. Figure 5-9 RF211_1A

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RF212_1A An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only. The star topology is applied to connect the BBU with the RRU3004. Figure 5-10 RF212_1A

RF222_1A An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Both antenna channel 1 and antenna channel 2 transmit and receive signals. The star topology is applied to connect the BBU with the RRU3004.

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Figure 5-11 RF222_1A

RF112_2B Two RRU3004 connect to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. RX_IN/OUT on the two RRU3004 interconnect to transfer diversity signals. The chain topology is applied to connect the BBU with one RRU3004. Figure 5-12 RF112_2B

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Typical Configurations Table 5-6 describes the typical configurations of RRU3004 in different scenarios. Table 5-6 Typical configurations Scenari o

Number of Modules

Send Mode

Typical Configuration

S1

1

Transmit diversity

RF222_1A

Independent transmit

l RF111_1A l RF212_1A l RF222_1A

S2

1

l RF111_1A

Independent transmit or combination

l RF212_1A l RF222_1A

2

PBT

RF112_2B

S3

2


RF112_2B

S4

2


l RF112_2B l RF111_1A + RF111_1A

5.5 Configurations of RRU3008, RRU3908, RRU3928, and the MRFUd RRU3008, RRU3908, and RRU3928 are multi-carrier remote radio units. Each of them supports eight carriers. The MRFUd is a multi-carrier radio frequency (RF) module and supports eight carriers. Different configurations must be chosen in different topologies.

Port Table 5-7 describes major ports on RRU3008 V1. Table 5-7 Major ports on RRU3008 V1

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Type

Silkscreen

Description

RF port




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5 RF System

Type

Silkscreen

Description

CPRI port

TX RX CPRI_W

The port is a westbound optical/ electrical port and it is used to connect to the BBU or an upper-level RRU.

TX RX CPRI_E

The port is an eastbound optical/ electrical port and it is used to connect to a lower-level RRU.

RX_IN/OUT



Table 5-8 describes major ports on RRU3008 V2 and RRU3908 V2. Table 5-8 Major ports on RRU3008 V2 and RRU3908 V2 Type

Silkscreen

Description

RF port



CPRI port

RX TX CPRI0

The port is used to connect to the BBU or an upper-level RRU.

TX RX CPRI1

The port is used to connect to the BBU or a lower-level RRU.

RX_IN/OUT



Table 5-9 describes major ports on RRU3908 V1. Table 5-9 Major ports on RRU3908 V1

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Type

Silkscreen

Description

RF port

ANT-A and ANT-B


CPRI port

TX RX CPRI_W

The port is a westbound optical/ electrical port and it is used to connect to the BBU.


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Type


Silkscreen

Description

TX RX CPRI_E

The port is an eastbound optical/ electrical port and it is used to connect to the BBU.

RX_IN/OUT


Table 5-10 describes major ports on RRU3928. Table 5-10 Major ports on RRU3928 Type

Silkscreen

Description

RF port



CPRI port

CPRI0

The port is optical/electrical port 0 and it is used to connect to the BBU.

CPRI1

The port is optical/electrical port 1 and it is used to connect to the BBU.

RX_IN/OUT



Table 5-11 describes major ports on the MRFUd. Table 5-11 Major ports on the MRFUd

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Type

Silkscreen

Description

RF port



CPRI port

CPRI0

The port is used to connect to the BBU.

CPRI1

The port is used to connect to the BBU.


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Type

Silkscreen

Description


RX_INB

The port is used to receive diversity signals from an antenna channel.

RX_OUTA

The port is used to transmit diversity signals to an antenna channel.

Basic Configurations The basic configurations of RRU3008, RRU3908, RRU3928, and the MRFUd are the same. The following description takes RRU3008 V2 as an example. Table 5-12 lists the basic configurations of a single sector. The basic configurations are described in the "RF[F][TX][RX]_[C][TYPE]" format. Where, l


l


l


l


l



Number of Modules



RF111_1A

1


Figure 5-13

RF112_2B

2


Figure 5-14

RF211_1A

1


Figure 5-15

RF212_1A

1


Figure 5-16

RF222_1A

1


Figure 5-17

RF111_1A An RRU3008 connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. The star topology is applied to connect the BBU with the RRU3008. Issue 03 (2011-08-30)


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RF112_2B Two RRU3008 connect to the antenna system through ANT_TX/RXA. Each antenna channel 1 transmits and receives signals. RX_IN/OUT on the two RRU3008 interconnect to transfer diversity signals. The chain topology is applied to connect the BBU with one RRU3008. Figure 5-14 RF112_2B

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RF211_1A An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals. The star topology is applied to connect the BBU with the RRU3008. Figure 5-15 RF211_1A

RF212_1A An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only. The star topology is applied to connect the BBU with the RRU3008.

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RF222_1A An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Each antenna channel transmits and receives signals. The star topology is applied to connect the BBU with the RRU3008. Figure 5-17 RF222_1A

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Typical Configurations Table 5-13 describes the typical configurations of RRU3008 in different scenarios. Table 5-13 Typical configurations Scenario

Number of Modules

Send Mode


S3-S8

1


RF212_1A

Transmit diversity

RF222_1A

Combined transmit

RF112_2B


RF222_1A + RF222_1A

S8-S12

2

5.6 DRFU Configuration The DRFU is a double-transceiver module and supports two carriers. Different configurations must be chosen in different topologies.

Port Table 5-14 describes major ports on the DRFU. Table 5-14 Major ports on the DRFU Type

Silkscreen

Description

Port for transceiving RF signals

ANT1 and ANT2


CPRI port

CPRI0

The port is used to connect to a lowerlevel DRFU.

CPRI1

The port is used to connect to the BBU or an upper-level DRFU.

RX1/IN and RX1/OUT

RX1/IN is the diversity receive port for antenna channel 1 while RX1/ OUT is the diversity transmit port for antenna channel 1.

RX2/IN and RX2/OUT

RX2/IN is the diversity receive port for antenna channel 2 while RX2/ OUT is the diversity transmit port for antenna channel 2.


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Basic Configurations Table 5-15 lists the basic configurations of a DRFU serving only one sector. The format of the description of the basic configuration is RF[F][TX][RX]_[C][TYPE]. Where, l


l


l


l


l



Number of Modules



RF111_1A

1


Figure 5-18

RF211_1A

1


Figure 5-19

RF212_1A

1


Figure 5-20

RF222_1A

1


Figure 5-21

RF112_2A

2


Figure 5-22

RF224_2A

2


Figure 5-23

RF111_1A A DRFU connects to the antenna system through ANT1. Antenna channel 1 transmits and receives signals.

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RF211_1A A DRFU connects to the antenna system through ANT1 and ANT2. Antenna channel 1 transmits signals while antenna channel 2 receives signals.

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RF212_1A A DRFU connects to the antenna system through ANT1 and ANT2. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only.

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RF222_1A A DRFU connects to the antenna system through ANT1 and ANT2. Both antenna channel 1 and antenna channel 2 transmit and receive signals.

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RF112_2A Two DRFUs connect to the antenna system through ANT1. Antenna channel 1 transmits and receives signals. RX1/IN on one DRFU interconnects with RX1/OUT on the other DRFU to transfer the diversity signals received through antenna channel 1.

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RF224_2A Two DRFUs connect to the antenna system through their own ports ANT1 and ANT2. Both antenna channel 1 and antenna channel 2 transmit and receive signals. RX1/IN on one DRFU interconnects with RX1/OUT on the other DRFU to transfer the diversity signals received through antenna channel 1. RX2/IN on one DRFU interconnects with RX2/OUT on the other DRFU to transfer the diversity signals received through antenna channel 2.

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Typical Configurations Table 5-16 describes the typical configurations of the DRFU in different scenarios. Table 5-16 Typical configurations Scenario

Number of Modules

Send Mode


S1

1

Transmit diversity

RF222_1A


l RF111_1A l RF212_1A l RF222_1A

S2

1


l RF111_1A l RF212_1A l RF222_1A

2

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PBT


RF112_2A

47


Scenario

5 RF System

Number of Modules

Send Mode


Transmit diversity

l RF222_1A + RF222_1A l RF224_2A (the receive mode is four-way receive diversity)

S3

2


RF112_2A

S4

2


l RF112_2A l RF111_1A + RF111_1A l RF224_2A (the receive mode is four-way receive diversity)

Two carriers of a DRFU can be shared by two cells. That is, a DRFU can serve two cells. Therefore, three DRFUs are used to achieve the configuration S3/3. Figure 5-24 shows the hardware configuration in the scenario where the configuration S3/3 is applied and Table 5-17 shows the corresponding data configuration. Figure 5-24 Hardware configurations in the configuration S3/3

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Table 5-17 Data configurations in the configuration S3/3 DRFU

Send Mode


DRFU0



DRFU1 DRFU2

Double feeder [2TX 4RX] Single feeder [1TX 2RX]

5.7 Configurations of the GRFU/MRFU/MRFUe The GRFU, MRFU V1, MRFU V2, MRFUe, and MRFU V3 are multi-carrier radio frequency (RF) modules. A GRFU or MRFU V1 or MRFU V2 or MRFU V3 supports six carriers, and an MRFUe supports eight carriers. Different configurations must be chosen in different topologies.

Port Table 5-18 describes major ports on the GRFU, MRFU V1, MRFU V2, MRFUe, and MRFU V3. Table 5-18 Major ports on the GRFU, MRFU V1, MRFU V2, MRFUe, and MRFU V3 Type

Silkscreen

Description

RF port

ANT_TX/RXA

The port, used to transmit and receive RF signals, connects to the antenna system through antenna channel 1.

ANT_RXB

The port, used to receive RF signals, connects to the antenna system through antenna channel 2.

CPRI0

The port is used to connect to the BBU or an upper-level RFU.

CPRI1

The port is used to connect to the BBU or a lower-level RFU.

RX_INB and RX_OUTA

RX_INB is the diversity receive port for an antenna channel while RX_OUTA is the diversity transmit port for the antenna channel.

CPRI port


Basic Configurations The basic configurations of the GRFU, MRFU V1, MRFU V2, MRFUe, and MRFU V3 are the same. The following description takes the GRFU as an example. Table 5-19 lists the basic configurations of the GRFU serving a single sector. The basic configurations are described in the "RF[F][TX][RX]_[C][TYPE]" format. Where, Issue 03 (2011-08-30)


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5 RF System

l


l


l


l


l


Table 5-19 Basic configurations Basic Configurations

Number of Modules

Send and Receive Mode


RF111_1A

1


Figure 5-25

RF112_2A

2


Figure 5-26

RF211_1A

1


Figure 5-27

RF212_1A

1


Figure 5-28

RF111_1A A GRFU connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals.

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RF112_2A Two GRFUs connect to the antenna system through ANT_TX/RXA. Each antenna channel 1 transmits and receives signals. RX_INB on one GRFU interconnects with RX_OUTA on the other GRFU to transfer the diversity signals received through an antenna channel.

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RF211_1A A GRFU connects to the antenna system through ANT_TX/RXA and ANT_RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals.

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RF212_1A A GRFU connects to the antenna system through ANT_TX/RXA and ANT_RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only.

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Typical Configurations Table 5-20 lists the typical configurations of the GRFU and MRFU in various scenarios. Table 5-21 lists the typical configurations of the MRFUe in various scenarios. Table 5-20 Typical configurations of the GRFU and MRFU

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Scenario

Number of Modules

Typical Configurations

S3-S6

1

RF212_1A

S7-S12

2

RF112_2A

S13-S18

3

RF112_2A + RF212_1A

S19-S24

4

RF112_2A + RF112_2A


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Table 5-21 Typical configurations of the MRFUe Scenario

Number of Modules

Typical Configurations

S3-S8

1

RF212_1A

S9-S16

2

RF112_2A

NOTE

The configurations of the GRFU, MRFU, or MRFUe serving multiple sectors are the combination of the configurations of several GRFUs, MRFUs, or MRFUes serving a single sector.

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6 Antenna System

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). It transmits and receives RF signals.

Antenna Antennas are used to radiate and receive radio waves. The working principle of antennas is as follows: 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 of electromagnetic waves. At the destination, antennas receive the electromagnetic waves, convert them into RF signals, and transmit the signals to a radio transmitter over feeders. A remote control (RC) can control the downtilt of the remote electric tilt (RET) antennas remotely.

Feeders and Jumpers Feeders and jumpers are used to transmit RF signals between antennas and radio transmitters at minimum loss.

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

BT The BT couples the On-Off-Keying (OOK) signals or RF signals into the passive components of feeders.

GATM The GATM must be configured if the DRFU, RET antennas, and TMA are configured. Functions of the GATM are as follows: l

Controlling RET antennas.

l

Feeding power to the TMA.

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l

Reporting RET control alarms.

l

Monitoring the current designated for the TMA.

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7

Operation and Maintenance

About This Chapter Operation and Maintenance (OM) covers management, monitoring, and maintenance of the software, hardware, and configuration of the BTSs. In addition, diversified OM modes are provided in various scenarios. 7.1 OM Modes of the BTS The OM modes of the BTS consist of the Site Maintenance Terminal mode, Local Maintenance Terminal mode, and centralized network management mode. 7.2 OM Functions of the BTS The OM functions of the BTS consist of equipment management, software management, configuration management, service management, performance management, security management, alarm management, and environment monitoring.

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7.1 OM Modes of the BTS The OM modes of the BTS consist of the Site Maintenance Terminal mode, Local Maintenance Terminal 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 to the BTS through the Ethernet. You can use the Site Maintenance Terminal to operate and maintain 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 Abis interface, which is an interface between the BSC and the BTS. The LMT communicates with 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 the BSC and BTS.

l

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

7.2 OM Functions of the BTS The OM functions of the BTS consist of equipment management, software management, configuration management, service management, performance management, security management, alarm management, and environment monitoring. Issue 03 (2011-08-30)


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

Software Management Provides various functions, such as downloading and activating the BTS software, upgrading patches, and loading and downloading files. The associated tasks involve consistency check on the software and hardware releases, release management, and software upgrade.

Configuration Management l

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 data takes effect after the BTS is reset.

Service Management l

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 Management l

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 Management Provides security management functions, such as connection management, user authentication, encryption, and forward and backward resolution of the interface messages between the BTS software and the OMC.

Alarm Management l

Supports query of real-time alarms and history alarms

l

Collects internal and external alarms, such as the environment monitoring device inputs and Boolean inputs

l

Processes alarm correlation to ensure precision and accuracy in locating alarms

l

Provides functions of saving, interpreting, prompting, shielding, filtering, confirming, clearing, post processing, and reporting of alarms

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l


Provides functions of detecting and reporting alarms, and processing alarm correlation in the system

Environment Monitoring l

Provides a perfect environment monitoring system.

l

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

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8

8 External Reference Clock Sources

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 a certain period of time.

IP Reference Clock When a BTS works in IP over FE mode, it obtains clock signals from an IP reference clock. In this 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, the BTS 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 clock signals for bit synchronization and frame synchronization. An E1/T1 reference clock obtains clock signals from the BSC or transport network. The BTS can obtain clock signals from the BSC using an E1/T1 port. If the BTS adopts IP transmission mode but an IP reference clock is unavailable, 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 synchronous Ethernet 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 BITS clock 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. Issue 03 (2011-08-30)


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8 External Reference Clock Sources

Free-Run Clock In the absence of external clocks, the internal free-run clock ensures that the BTS keeps working properly for at least ninety days.

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9

Surge Protection Specifications

This section provides surge protection specifications for the BBU, RF modules, and each type of 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 Nominal discharge current.

Surge Protection Specifications of the Ports on BTS3900 (Ver.B) Table 9-1 lists the surge protection specifications of the ports on BTS3900 (Ver.B). Table 9-1 Surge protection specifications of the ports on BTS3900 (Ver.B) Port

Surge Protection Mode

Specification

DC power supply port

Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

5 kA

Common mode

5 kA

AC power supply port

Surge

Surge current

Surge Protection Specifications for the Ports on the BTS3900 (Ver.C) Table 9-2 describes the surge protection specifications for the ports on the BTS3900 (Ver.C). Issue 03 (2011-08-30)


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Table 9-2 Surge protection specifications for the ports on the BTS3900 (Ver.C) Port


Specification

-48 V DC power supply port

Differential mode

2 kV (surge waveform of 1.2/50 μs)

Common mode

4 kV (surge waveform of 1.2/50 μs)

Differential mode

l 5 kA

220 V AC power supply port

l 2 kV (surge waveform of 1.2/50 μs) l 5 kA

Common mode

l 4 kV (surge waveform of 1.2/50 μs)

Surge Protection Specifications for the Ports on BTS3900L (Ver.B) Table 9-3 describes the surge protection specifications for the ports on BTS3900L (Ver.B). Table 9-3 Surge protection specifications for the ports on BTS3900L (Ver.B) Port


Specification


Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Surge Protection Specifications for the Ports on the BTS3900L (Ver.C) Table 9-4 describes the surge protection specifications for the ports on the BTS3900L (Ver.C). Table 9-4 Surge protection specifications for the ports on the BTS3900L (Ver.C) Port


Specification


Differential mode

1 kA

Common mode

2 kA

Surge Protection Specifications for the Ports on BTS3900A (Ver.B) Table 9-5 describes the surge protection specifications for the ports on BTS3900A (Ver.B).

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Table 9-5 Surge protection specifications for the ports on BTS3900A (Ver.B) Port

Usage Scenario


Specification

-48 V DC output remote port

Applicable to all scenarios

Surge current

Differential mode

10 kA

Common mode

20 kA

Applicable to the scenario where transmissi on cabinets, battery cabinets, or BTS3900 A (DC) is used

Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

10 kA

Common mode

20 kA

Applicable to the scenario where only RFC cabinets are used

Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

3 kA

Common mode

5 kA

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

40 kA

Common mode

40 kA

-48 V DC input port


Applicable to the scenario where BTS3900 A is configured remotely or is placed outdoors

Surge current

Surge current

Surge

Surge current

Surge Protection Specifications for the Ports on the BTS3900A (Ver.C) Table 9-6 describes the surge protection specifications for the ports on the BTS3900A (Ver.C).

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Table 9-6 Surge protection specifications for the ports on the BTS3900A (Ver.C) Port


Specification


Differential mode

l 10 kA l 2 kV (surge waveform of 1.2/50 μs)

Common mode


220 V AC power supply port

Differential mode


Common mode


Surge Protection Specifications for the Ports on BBU3900 Table 9-7 describes the surge protection specifications for the ports on BBU3900. Table 9-7 Surge protection specifications for the ports on BBU3900

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Port

Usage Scenario


Specification

-48 V DC port

Applicable to the scenario where BBU3900 is installed indoors

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

24 V DC port


Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

FE/GE port


Differential mode

0.5 kV (1.2/50 μs)

Common mode

2 kV (1.2/50 μs)


67


Port

GPS port

RGPS port

E1/T1 port

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Usage Scenario


Applicable to the scenario where BBU3900 is configured remotely or is placed outdoors

Surge

Surge current

Specification

Differential mode

1 kV (1.2/50 μs)

Common mode

2 kV (1.2/50 μs)

Differential mode

1 kA per cable

Common mode

6 kA (8 cables)


Onboard surge

Differential mode

250 A

Surge protector configured

Differential mode

8 kA

Common mode

40 kA


Onboard surge

Differential mode

250 A

Common mode

250 A

Surge protection module configured

Differential mode

3 kA

Common mode

5 kA


Onboard surge

Differential mode

250 A

Common mode

250 A

Applicable to the scenario where BBU3900 is configured remotely or

Surge protection box configured

Differential mode

3 kA


68


Port


Usage Scenario


is placed outdoors

Dry contact

RS485 alarm port

Specification

Common mode

5 kA


Onboard surge

Differential mode

250 A


Surge protection board configured

Differential mode

3 kA

Common mode

5 kA


Onboard surge

Differential mode

250 A

Common mode

250 A


Surge protection board configured

Differential mode

3 kA

Common mode

5 kA

Surge Protection Specifications for the Ports on RF Modules Table 9-8 describes the surge protection specifications for the ports on RRU3004 and RRU3008 V1. Issue 03 (2011-08-30)


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Table 9-8 Surge protection specifications for the ports on RRU3004 and RRU3008 V1 Port

Usage Scenario


Specification



Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

10 kA

Common mode

20 kA

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

5 kA

Common mode

5 kA

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

40 kA

Common mode

40 kA

Differential mode

8 kA

Common mode

40 kA

Surge current


Surge

Surge current

Applicable to the scenario where RF modules are configured remotely or are placed outdoors with the correspondi ng base station

Surge


Surge current

CPRI port


Surge

RGPS port


Surge current

Antenna port

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Applicable to the scenario where RF modules are installed indoors

Surge current

250 A

Differential mode


3 kA

70


Port

AISG RET antenna port


Usage Scenario



Surge current

Dry contact or RS485 alarm port


Surge current

I2C port on a local power monitoring device and an alarm port

Applicable to the scenario where batteries under monitoring and RRUs are installed back to back or the scenario where the distance between them is shorter than 1m

Surge

Specification

Common mode

5 kA

Differential mode

3 kA

Common mode

5 kA

Differential mode

250 A

Common mode

250 A 250 A

Table 9-9 describes the surge protection specifications for the ports on the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd, MRFUe, MRFU V3, RRU3008 V2, RRU3908, RRU3928, and RRU3929. Table 9-9 Surge protection specifications for the ports on the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd, MRFUe, MRFU V3, RRU3008 V2, RRU3908, RRU3928, and RRU3929

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Port

Usage Scenario


Specification



Surge

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)


71


Port


Usage Scenario

Applicable to the scenario where RF modules are installed indoors


Specification

Surge current

Differential mode

10 kA

Common mode

20 kA

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

5 kA

Common mode

5 kA

Differential mode

2 kV (1.2/50 μs)

Common mode

4 kV (1.2/50 μs)

Differential mode

40 kA

Common mode

40 kA

Differential mode

8 kA

Common mode

40 kA

Surge

Surge current

Applicable to the scenario where RF modules are configured remotely or are placed outdoors with the correspondi ng base station

Surge


Surge current

CPRI port


Surge

RGPS port


Surge current


Surge current

Antenna port

RET antenna port

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Surge current

250 A

Differential mode

3 kA

Common mode

5 kA

Differential mode

3 kA

Common mode

5 kA


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Port

Usage Scenario


Specification

Dry contact or RS485 alarm port


Surge current

Differential mode

3 kA

Common mode

5 kA

I2C port on a local power monitoring device and an alarm port

Applicable to the scenario where batteries under monitoring and RRUs are installed back to back or the scenario where the distance between them is shorter than 1m

Surge


250 A

73

3900 Series GSM Base Station Technical Description(V100R013_03)(PDF)-En

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