31027718-HUAWEI BSC6000 System Description

8/13/2019 31027718-HUAWEI BSC6000 System Description

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Huawei Technologies Proprietary

HUAWEI BSC6000 Base Station Controller

V900R001C01System Description

Issue 01

Date 2007-01-10

Part Number 31027718


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Huawei Technologies Proprietary

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. Forany assistance, please contact our local office or company headquarters.

Huawei Technologies Co., Ltd.

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Website: http://www.huawei.com

Email: [email protected]

Copyright Huawei Technologies Co., Ltd. 2007. All rights reserved.

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Notice

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.
http://www.huawei.com/mailto:[email protected]:[email protected]://www.huawei.com/


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System Description Contents

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Contents

About This Document.....................................................................................................................1

1 Introduction to BSC6000...........................................................................................................1-1

1.1 Position of the BSC6000 ............................................................ ............................................................... ..1-2

1.2 Functions .......................................................... ............................................................. ..............................1-3

2 Key Benefits ................................................................................................................................2-1

2.1 Large Capacity and High Integration ..........................................................................................................2-2

2.2 Flexible Configuration.................................................................................................................................2-2

2.3 Comprehensive Functions ......................................................... ................................................................ ..2-3

2.3.1 Overview...........................................................................................................................................2-3

2.3.2 Basic Functions ........................................................ .............................................................. ...........2-3

2.3.3 Optional Functions ............................................................. .............................................................. .2-4

2.4 Advanced RRM Algorithms ................................................................ ........................................................ 2-5

2.4.1 Overview...........................................................................................................................................2-5

2.4.2 Power Control ...................................................................................................................................2-5

2.4.3 Handover.......................................................... ............................................................. ....................2-5

2.4.4 Radio Resource Allocation................................................................................................................2-5

2.5 Smooth Upgrade and Capacity Expansion ...................................................... ............................................2-6

2.6 Compatibility with the Protocol Versions....................................................................................................2-6

2.7 Convenient Operation & maintenance.........................................................................................................2-6

2.8 Carrier-Class Reliability Design..................................................................................................................2-7

3 System Architecture...................................................................................................................3-1

3.1 Hardware Structure......................................................................................................................................3-2

3.1.1 Cabinet Appearance...........................................................................................................................3-2

3.1.2 Cabinet Configuration ............................................................. .......................................................... 3-2

3.1.3 GIMS.................................................................................................................................................3-4

3.1.4 Service Subrack.................................................................................................................................3-5

3.1.5 Board.................................................................................................................................................3-8

3.2 Logical Structure ........................................................... ................................................................... ...........3-9

3.3 Hardware Configuration............................................................................................................................3-10

3.3.1 Minimum Configuration..................................................................................................................3-10

3.3.2 Maximum Configuration.................................................................................................................3-11


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Contents


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3.3.3 Typical Configuration......................................................................................................................3-13

3.4 GTCS.........................................................................................................................................................3-14

3.4.1 Overview of the GTCS....................................................................................................................3-14

3.4.2 Connection Between BSC6000 Subracks........................................................................................3-14

3.4.3 Features of the GTCS......................................................................................................................3-15

3.4.4 Capacity of the GTCS ........................................................... .......................................................... 3-15

4 Functions......................................................................................................................................4-1

4.1 Basic Functions ...................................................... ................................................................ .....................4-2

4.1.1 Band Supporting................................................................................................................................4-2

4.1.2 Service Provisioning .........................................................................................................................4-2

4.1.3 Mobility Management ...................................................... ............................................................... ..4-2

4.1.4 Cell Selection ......................................................... ................................................................ ...........4-2

4.1.5 Call Control.......................................................................................................................................4-2

4.1.6 Handover.......................................................... ............................................................. ....................4-2

4.1.7 Power Control ...................................................................................................................................4-3

4.1.8 Measurement Report ....................................................... ................................................................ ..4-3

4.1.9 Adjustment of Adaptive Timing Advance .........................................................................................4-3

4.1.10 Radio Resource Management..........................................................................................................4-3

4.1.11 System Information ....................................................... ................................................................. .4-3

4.1.12 O&M Functions...............................................................................................................................4-3

4.1.13 LAPD Multiplexing on the Abis Interface ......................................................................................4-3

4.1.14 Reliability and Maintainability........................................................................................................4-3

4.1.15 A Interface Functions.......................................................................................................................4-4

4.1.16 Supporting Three-Digit MNC .........................................................................................................4-4

4.1.17 STM-1 .................................................. ............................................................ ...............................4-4

4.1.18 Message Tracing..............................................................................................................................4-4

4.1.19 Cell Frequency Scan........................................................................................................................4-5

4.1.20 TCH Reassignment..........................................................................................................................4-5

4.2 Optional Functions .............................................................. ............................................................. ...........4-5

4.2.1 SDCCH Dynamic Adjustment...........................................................................................................4-5

4.2.2 PDCH Dynamic Adjustment .......................................................... ................................................... 4-5

4.2.3 Concentric Cell..................................................................................................................................4-54.2.4 Enhanced Full Rate ...........................................................................................................................4-5

4.2.5 Half Rate ...........................................................................................................................................4-6

4.2.6 Ciphering...........................................................................................................................................4-6

4.2.7 Short Message Service Cell Broadcast..............................................................................................4-6

4.2.8 Frequency Hopping ............................................................. ............................................................. .4-6

4.2.9 TRX Mutual-Assistance............................................................. ....................................................... 4-7

4.2.10 Satellite Transmission......................................................................................................................4-7

4.2.11 Extended Cell ............................................................... ................................................................. ..4-7

4.2.12 GPRS...............................................................................................................................................4-7


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System Description Contents

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4.2.13 EGPRS .......................................................... .............................................................. ....................4-7

4.2.14 2G/3G Interoperability ...................................................................... ..............................................4-7

4.2.15 Multi-Band Networking ............................................................. ..................................................... 4-7

4.2.16 GSM900/DCS1800 Co-BCCH Cell................................................................................................4-8

4.2.17 Performs power control of the TRXs on each frequency band........................................................4-8

4.2.18 Semi-Permanent Connection...........................................................................................................4-8

4.2.19 DTX and DRX ................................................................................................................................4-8

4.2.20 Extended Frequency Band...............................................................................................................4-8

4.2.21 eMLPP.............................................................................................................................................4-9

4.2.22 Network-Assisted Cell Change ...................................................... ................................................. 4-9

4.2.23 High Speed Signaling......................................................................................................................4-9

4.2.24 Local Multiple Signaling Points......................................................................................................4-9

4.2.25 LCS .................................................................................................................................................4-9

4.2.26 Adaptive Multi Rate ......................................................... ............................................................. 4-10

4.2.27 Speech Quality Enhancement........................................................................................................4-10

4.2.28 TFO ....................................................... ........................................................... .............................4-10

4.2.29 Coverage enhanced .......................................................................................................................4-10

5 O&M.............................................................................................................................................5-1

5.1 O&M Topology ........................................................ ............................................................... ....................5-2

5.1.1 LMT ........................................................ ........................................................... ...............................5-2

5.1.2 iManager M2000...............................................................................................................................5-3

5.2 O&M Function ........................................................ ................................................................ ....................5-3

5.2.1 Security Management........................................................................................................................5-4

5.2.2 Configuration Management...............................................................................................................5-4

5.2.3 Maintenance Management ................................................................................................................5-5

5.2.4 Software Management.......................................................................................................................5-5

5.2.5 Performance Management.................................................................................................................5-5

5.2.6 Fault Management.............................................................................................................................5-6

5.2.7 State Monitoring................................................................................................................................5-6

5.2.8 Message Tracing................................................................................................................................5-6

6 Reliability ....................................................................................................................................6-1

6.1 System Reliability Design ................................................................. .......................................................... 6-2

6.2 Hardware Reliability Design ............................................................... ........................................................ 6-2

6.3 Software Reliability Design ........................................................................................................................6-3

7 Technical Specifications...........................................................................................................7-1

7.1 Performance Specifications ..................................................................... .................................................... 7-2

7.2 Capacity Specifications ...................................................... .............................................................. ...........7-2

7.3 Clock Specifications....................................................................................................................................7-2

7.4 Reliability Specifications.............................................................................................................................7-3

7.5 Structure Specifications...............................................................................................................................7-3

7.6 Electrical Specifications ............................................................... ............................................................. ..7-3


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Contents


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7.6.1 Power Consumption of a Single Subrack..........................................................................................7-3

7.6.2 Power Consumptions of Typical Configurations...............................................................................7-4

7.6.3 Power Supply and EMC Specifications ............................................................................................7-4

7.7 Noise and Security Specifications ........................................................... .................................................... 7-5

7.8 Environment Requirements..................................................................... .................................................... 7-5

7.8.1 Storage Environment.........................................................................................................................7-5

7.8.2 Transportation Environment..............................................................................................................7-8

7.8.3 Operation Environment .......................................................... ......................................................... 7-10

8 Installation...................................................................................................................................8-1

8.1 Hardware Installation ............................................................. .......................................................... ...........8-2

8.1.1 Equipment Room Layout .......................................................... ........................................................ 8-2

8.1.2 Requirements on the Equipment Room.............................................................................................8-2

8.2 Software Installation....................................................................................................................................8-3

A Acronyms and Abbreviations............................................................................................... A-1

Index ................................................................................................................................................ i-1


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System Description Figures

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Figures

Figure 1-1Position of the BSC6000 in the network.........................................................................................1-2

Figure 3-1BSC6000 cabinet ............................................................................................................................3-2

Figure 3-2Front view of the GBCR........ ................................................................ .........................................3-3

Figure 3-3Front view of the GBSR .................................................................................................................3-4Figure 3-4Internal layout of the BSC6000 subrack ........................................................... ..............................3-5

Figure 3-5Fully configured GMPS..................................................................................................................3-6

Figure 3-6Fully configured GEPS........................................................ ......................................................... ..3-7

Figure 3-7Fully configured GTCS (with E1 transmissions on the A interface).......................... .....................3-7

Figure 3-8Fully configured GTCS (with STM-1 transmissions on the A interface)........................................3-8

Figure 3-9Logical structure of the BSC6000 system.......................................................................................3-9

Figure 3-10BSC6000 minimum configuration (with the GTCS and all the other subracks in one cabinet)..3-10

Figure 3-11Minimum configuration of the BSC6000 (with the GTCS at the MSC side).............................. 3-11

Figure 3-12BSC6000 maximum configuration (with the GTCS installed together with all the other subracks)

.........................................................................................................................................................................3-11

Figure 3-13BSC6000 maximum configuration (with the GTCSs at the MSC side)......................................3-12

Figure 3-14BSC6000 maximum configuration (with the GTCSs installed together with all the other subracks)

.........................................................................................................................................................................3-12

Figure 3-15BSC6000 maximum configuration (with the GTCSs at the MSC side)......................................3-13

Figure 3-16Connection between the GMPS/GEPS and the GTCS................................................................3-14

Figure 3-17Links on the Ater interface..........................................................................................................3-15

Figure 5-1O&M system of the BSC6000 ............................................................. ...........................................5-2

Figure 5-2M2000 system structure..................................................................................................................5-3

Figure 8-1Equipment room layout...................................................................................................................8-2


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System Description Tables

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Tables

Table 2-1Capacity of the BSC6000 .................................................................................................................2-2

Table 2-2Basic functions of the BSC6000.......................................................................................................2-3

Table 2-3Optional functions of the BSC6000..................................................................................................2-4

Table 3-1Boards of the BSC6000 ...................................................... ............................................................. .3-8Table 3-2BSC6000 function description..........................................................................................................3-9

Table 3-3BSC6000 typical configuration.......................................................................................................3-13

Table 3-4Capacity of the boards in the GTCS and of the A interface boards................................................. 3-16

Table 3-5Numbers of boards in a fully configured GTCS.................................................................. ...........3-16

Table 3-6Capacity specifications of the GTCS (with E1 transmissions on the A interface) ..........................3-16

Table 3-7Capacity specifications of the GTCS (with STM-1 transmissions on the A interface) ...................3-17

Table 4-1E-GSM/R-GSM bands......................................................................................................................4-8

Table 7-1Performance specifications of the BSC6000 ............................................................................. .......7-2

Table 7-2Clock specifications of the BSC6000 ........................................................... ....................................7-2

Table 7-3Reliability specifications of the BSC6000........................................................................................7-3

Table 7-4Structure specifications of the BSC6000 .................................................................... ......................7-3

Table 7-5Power consumption of a single BSC6000 subrack ................................................................... ........7-4

Table 7-6Power consumption of the BSC6000 in typical configurations ........................................................ 7-4

Table 7-7Electrical specifications of the BSC6000..........................................................................................7-4

Table 7-8Noise and security specifications of the BSC6000 ...................................................................... .....7-5

Table 7-9Climate requirements for equipment storage............................................................... .....................7-5

Table 7-10Storage requirements for physically active materials .....................................................................7-7

Table 7-11Storage requirements for chemically active materials.....................................................................7-7

Table 7-12Mechanical stress requirements for storage environment...............................................................7-7

Table 7-13Climate requirements for equipment transportation .......................................................................7-8

Table 7-14Transportation requirements for physically active materials ..........................................................7-9

Table 7-15Transportation requirements for chemically active materials ......................................................... 7-9


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Tables


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viii Huawei Technologies Proprietary Issue 01 (2007-01-10)

Table 7-16Mechanical stress requirements for transportation .......................................................................7-10

Table 7-17Operation requirements for temperature and humidity.................................................................7-10

Table 7-18Operation requirements for other climax factors .......................................................... ................7-11

Table 7-19Operation requirements for physically active materials................................................................7-11

Table 7-20Operation requirements for chemically active materials............................................................... 7-11

Table 7-21Mechanical stress requirements during equipment operation .......................................................7-12


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System Description About This Document

Issue 01 (2007-01-10) Huawei Technologies Proprietary 1

About This Document

Purpose

This document describes the features, architecture, and functions of the BSC6000. It alsoprovides the operation and maintenance, technical specifications, and installation of theBSC6000.

Related Versions

The following table lists the version of the product that is described in this document.

Product Name Version

HUAWEI BSC 6000 V900R001

Intended Audience

This document is intended for:

Project engineers System engineers

OrganizationThis document consists of eight chapters and one appendix. It is organized as follows:

Chapter Description

1 Introduction toBSC6000

Introduces the network position, interfaces, and functionsof the BSC6000.

2 Key Benefits Introduces the features of the BSC6000.

3 System Architecture Describes the hardware structure, software structure, andhardware configurations of the BSC6000.

4 Functions Describes the basic and optional functions of the BSC6000.


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About This Document


System Description

2 Huawei Technologies Proprietary Issue 01 (2007-01-10)

Chapter Description

5 O&M Describes the structure and functions of the BSC6000O&M subsystem.

6 Reliability Introduces reliability in terms of:BSC6000 systemBSC6000 hardwareBSC6000 software

7 Technical Specifications Lists the technical specifications of the BSC6000.

8 Installation Introduces the hardware installation and software

installation of the BSC6000.

A Abbreviations Lists the abbreviations used in this document.

Conventions

Symbol Conventions

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

Symbol Description

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

Indicates a hazard with a medium or low level of risk that, ifnot avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation that, if not

avoided, could cause equipment damage, data loss, andperformance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or saveyou time.

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

General Conventions

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.


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System Description About This Document

Issue 01 (2007-01-10) Huawei Technologies Proprietary 3


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 Terminal display is in Courier New.

Command Conventions


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in square brackets [ ] areoptional.

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

[ x | y | ... ] Optional alternative items are grouped in square bracketsand separated by vertical bars. One or none is selected.

{ x | y | ... } * Alternative items are grouped in braces and separated by

vertical bars. A minimum of one or a maximum of all can beselected.

GUI Conventions


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

> Multi-level menus are in boldfaceand separated by the >

signs. For example, choose File > Create >Folder.

Keyboard Operation

Format Description

Key Press the key. For example, press Enterand press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing

Ctrl+Alt+Ameans the three keys should be pressedconcurrently.


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System Description 1 Introduction to BSC6000

Issue 01 (2007-01-10) Huawei Technologies Proprietary 1-1

1 Introduction to BSC6000About This Chapter

The following table lists the sections of this chapter.

Title Description

1.1 Position Introduces the network position and interfaces of theBSC6000.

1.2 Functions Introduces the functions of the BSC6000.


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1 Introduction to BSC6000


System Description

1-2 Huawei Technologies Proprietary Issue 01 (2007-01-10)

1.1 Position of the BSC6000

HUAWEI BSC6000 is the next generation of M900/M1800 BSC V300R002. Its newhardware platform and software architecture have the following features:

Enhance the system performance, capacity, and integrity

Support the evolution towards the GSM EDGE Radio Access Network (GERAN)

Improve the serviceability, maintainability, and testability of the BSC system.

The BSC6000 shares one hardware platform with the WCDMA Radio Network Controller

(RNC). It enables the GSM network to co-locate in one network with the Wideband Code

Division Multiple Access (WCDMA) network.

Figure 1-1shows the position of the BSC6000 in the GSM network.

Figure 1-1Position of the BSC6000 in the network

SGSN

MSC

GGSN

HLR

Abis

Pb

BSC

MS BTS

BTS

PCU

Um

A

Gb

PDN

MS

Gs

BSC: Base Station Controller BTS: Base Transceiver Station

GGSN: Gateway GPRS Support Node HLR: Home Location Register

MSC: Mobile Switching Center PCU: Packet Control Unit

PDN: Packet Data Network SGSN: Serving GPRS Support Node

The BSC6000 has the following interfaces:

Abis with the BTS

A interface with the MSC

Pb interface with the PCU

Gb interface with the SGSN

The BSC6000 plays an important role in the radio access and network optimization.


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System Description 1 Introduction to BSC6000


1.2 Functions

The main functions of the BSC6000 are:

Radio resource management

BTS management

Power control

Handover control

Performance measurement


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System Description 2 Key Benefits


2 Key BenefitsAbout This Chapter


Title Description

2.1 Large Capacity and HighIntegration

Introduces the capacity specifications of the BSC6000.

2.2 Flexible Configuration Introduces the configuration features of the BSC6000.

2.3 Comprehensive Functions Introduces the functions of the BSC6000.

2.4 Advanced RRM

Algorithms

Introduces the radio resource management (RRM)

algorithms of the BSC6000.

2.5 Smooth Upgrade and

Capacity Expansion

Introduces the capacity expansion and upgrading of the

BSC6000.

2.6 Compatibility with theProtocol Versions

Introduces the protocol releases supported by theBSC6000.

2.7 Convenient Operation &

maintenance

Introduces the O&M functions of the BSC6000.

2.8 Carrier-Class Reliability

Design

Introduces the carrier-class reliability of the BSC6000.


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2 Key Benefits


System Description


2.1 Large Capacity and High Integration

The BSC6000 has a large capacity and high integration. Table 2-1shows the details.

Table 2-1Capacity of the BSC6000

Specification Value

Maximum number of TRXs 2,048

Maximum traffic volume 12,000 Erlang

Busy Hour Call Attempts (BHCA) 2,340,000

Maximum number of subscribers 600,000

2 (when the A interface uses E1 transmissions and no

GTCS is included)

4 (when the A interface uses E1 transmissions andGTCSs are included and installed at the MSC side)

Maximum number of cabinets

3 (when the A interface uses STM-1 transmissions,

and GTCSs are included and installed at the MSCside)

The GSM TransCoder Subrack (GTCS) can be configured in an independent cabinet. The Ater interfacelies between the service subracks of the BSC6000.

2.2 Flexible Configuration

The BSC6000 has the following characteristics in terms of flexible configuration.

Multiple networking modes

The BSC6000 and the BTSs can use the star, chain, and tree networking modes.

Service-oriented hardware configuration

The configuration for the Circuit Switched domain (CS) service and Packet Switched domain

(PS) service is flexible. The system can be configured according to different requirements onvoice and data services in different phases of network construction.

Multiple clock sources

The selection of the synchronization clock is flexible. The clock sources can be obtained

from:

Building Integrated Timing Supply System (BITS)

A interface

Local oscillator


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2 Key Benefits


System Description


2.3.3 Optional Functions

Table 2-3lists the optional functions of the BSC6000.

Table 2-3Optional functions of the BSC6000

Number Function

1 SDCCH Dynamic Adjustment

2 PDCH Dynamic Adjustment

3 Concentric Cell

4 Enhanced Full Rate

5 Half Rate

6 Ciphering

7 Cell Broadcasting Short Message Service

8 Frequency Hopping

9 TRX Mutual-Assistance

10 Satellite Transmission

11 Extended Cell

12 GPRS

13 EGPRS

14 2G/3G Interoperability

15 Multi-band Networking

16 GSM900/DCS1800 Co-BCCH Cell

17 Semi-Permanent Connection

18 DTX and DRX

19 Extended Frequency Band

20 eMLPP

21 Network Assisted Cell Change

22 High Speed Signaling

23 Local Multiple Signaling Points

24 LCS

25 AMR

26 Speech Quality Enhancement

27 TFO


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Number Function

28 Coverage enhanced

2.4 Advanced RRM Algorithms

2.4.1 Overview

The BSC6000 adopts Huawei-patented Radio Resource Management (RRM) algorithms for

power control, handover, and resource allocation. These algorithms ensure optimal effect interms of network coverage, capacity, and quality.

2.4.2 Power ControlThe BSC6000 adopts the Huawei-patented power control algorithm. This algorithm lowers

the average transmit power of the BTS and MSs while keeps the transmission quality higherthan the specified threshold. This can reduce the interference to other channels, and save the

power consumption of MSs.

The power control can be more accurate and eliminate the hysteresis effect through thefollowing functions of the HW_II power control algorithm:

Measurement report prediction

Compensation

Overall power control judgment

2.4.3 Handover

The BSC6000 adopts the Huawei-patented handover algorithm. This algorithm can handle the

handovers under any radio environment. It can effectively improve the network QoS.

The handover algorithm supports handovers such as hierarchical handover, load sharinghandover, quick fall handover, power BudGeT (PBGT) handover, and concentric cell

handover.

2.4.4 Radio Resource Allocation

The BSC6000 realizes flexible radio resource allocation.

According to the QoS requirement and the load of the current cell, the BSC6000 can allocatea full rate TCH or a half rate TCH for a service request. This improves the utilization of theradio channel bandwidth, and meets the communication requirements.

The BSC6000 allocates the optimum channel based on the following analysis:

Channel interference

TRX priority

Channel historical occupation record

TRX load balance

This effectively improves the success rate of the radio channel allocation.


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2 Key Benefits


System Description


The BSC6000 supports dynamic conversion between TCH/F and TCH/H, and between PDCHand SDCCH according to users' requirements. This avoids the traffic loss due to the improper

initial configuration.

2.5 Smooth Upgrade and Capacity Expansion

The BSC6000 has the following characteristics in terms of upgrade and capacity expansion.

Smooth capacity expansionThe BSC6000 adopts modular design. You can expand the capacity just by addingrelevant modules. In this way, the investment can be saved to the most extent.

Online capacity expansionTo expand the system capacity, you can add service subracks or service processing

boards.After you start a service processing board, it can automatically load programs according

to the configuration data, and then start to provide services. Online patching

The software of the BSC6000 can be patched while the current services are ongoing.

2.6 Compatibility with the Protocol Versions

The BSC6000 is developed based on the 3GPP GERAN R4 standard. It supports the evolution

towards R5 and R6.

2.7 Convenient Operation & maintenance

The BSC6000 has the following features in terms of operation & maintenance (O&M):

Friendly GUIThe BSC6000 uses the Graphic User Interface (GUI), which facilitates the operations.

The LMT integrates the O&M of the system, the data configuration, and the alarmmanagement. It also supports multi-user operations.

Flexible Network Parameter Configuration

At a time, you can configure one cell or multiple cells, one single parameter or multipleparameters.

Performance measurement counterThe BSC6000 provides various performance measurement counters for the upper

network management system. The operators can use these counters to optimize thenetwork and analyze the system performance. The performance measurement counters

can be automatically generated and reported to the iManager 2000 (referred to as M2000hereinafter), thus facilitating the performance management.

Remote maintenance

The BSC6000 supports remote maintenance by the Internet and Virtual Private Network(VPN).

Online HelpThe BSC6000 provides the online help for the O&M GUI.


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2.8 Carrier-Class Reliability Design

To improve hardware reliability, the BSC6000 uses the following measures:

Active/Standby backup: interface units, service processing units, switching units andclock units

TC resource pool

Faulty detection/isolation technologies

To implement the self-healing function upon software failure and improve the software

reliability, the BSC6000 uses the following measures:

Regular detection

Task monitoring

Storage protection

Resource check


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System Description 3 System Architecture


3 System ArchitectureAbout This Chapter


Title Description

3.1 Hardware Structure Introduces the hardware structure of the BSC6000.

3.2 Logical Structure Introduces the logical structure of the BSC6000.

3.3 Hardware Configuration Introduces the hardware configuration for the BSC6000.

3.4 GTCS Introduces the transcoding functions of the BSC6000.


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3 System Architecture


System Description


3.1 Hardware Structure

3.1.1 Cabinet Appearance

The BSC6000 uses Huawei N68-22 cabinets. The dimensions of a BSC6000 cabinet are 2200

mm (height) x 600 mm (width) x 800 mm (depth). The cabinet design conforms to theIEC60297 and IEEE standards.

Figure 3-1shows the BSC6000 cabinet.

Figure 3-1BSC6000 cabinet

3.1.2 Cabinet Configuration

The BSC6000 has two kinds of racks: GSM BSC Control processing Rack (GBCR) and GSM

BSC Service processing Rack (GBSR).

GBCR

The GBCR performs service processing and O&M functions. It consists of:

Two service subracks


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One Keyboard, Video, and Mouse (KVM)

One LAN switch

One GSM Back Administration Module (GBAM)

Figure 3-2shows the front view of the GBCR.

Figure 3-2Front view of the GBCR

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(1) Front panel (2) GBAM (3) Cabling subrack

(4) LAN switch (5) KVM (6) Service subrack

(7) Air defense subrack (8) Power distribution box

GBSR

A GBSR is configured based on the service capacity requirements. It has only service

subracks. One GBSR can accommodate three service subracks.


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System Description


Figure 3-3shows the GBSR.

Figure 3-3Front view of the GBSR

3

1

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(1) Front panel (2) Service subrack

(3) Air defense subrack (4) Power distribution box

3.1.3 GIMS

The Keyboard, Video And Mouse (KVM), LAN switch, and GSM Back Administration

Module (GBAM) are called GSM Integrated Management System (GIMS). The functions ofthe GIMS are as follows:

KVMThe KVM is integrated equipment of a mouse, a keyboard, and a monitor. It serves forthe GBAM.


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LAN switchThe LAN switch provides 10 Mbit/s or 100 Mbit/s BASE-TX Ethernet port. The LMT

accesses the GBAM through the LAN switch, and then the GBAM accesses the M2000through the LAN switch.

GBAMThe GBAM is installed with OMU software. It is used for the operation and maintenance

of the BSC6000.

3.1.4 Service Subrack

Hardware Architecture

The BSC6000 has three types of service subrack:

GSM Main Processing Subrack (GMPS)

GSM Extended Processing Subrack (GETS)

GSM TransCoder Subrack (GTCS)

The width of the three types of subrack is 19 inches, as specified in IEC60297.

The height of the subracks is 12 U. The backplane present is in the middle of the subrack, andboards are inserted from both the front and the rear of the cabinet, as shown in Figure 3-4.

Figure 3-4Internal layout of the BSC6000 subrack

00 13

2714

06

20

Front boards

Backplane

Rear boards

Figure 3-4shows the internal layout of a service subrack. The backplane separates the servicesubrack into a front subrack and a rear subrack. Both the front and rear subracks provide 14

slots. The 28 slots are numbered 0027 from the front to the rear. In the service subrack, thefront subrack holds service boards, and the rear subrack holds interface boards for external

connections.

Two neighboring even and odd slots, for example, slot 00 and slot 01, slot 02 and slot 03,work in active/standby mode. The boards working in active/standby mode occupy the active

slot and standby slot.


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System Description


1 U =44.45 mm =1.75 inches.

GMPS

The GMPS processes services, and provides clock for the system. One BSC6000 isconfigured with one GMPS in the GBCR. The fully configured GMPS can hold 512 TRXs.

Figure 3-5shows the fully configured GMPS with E1 transmissions the interfaces of theGMPS.

Figure 3-5Fully configured GMPS

1300 01 02 03 07060504 08 09 10 1211

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GEPS

The GEPS processes services for the BSC. The BSC6000 is configured with 03 GEPSs in

the GBCR or the GBSR. Compared with the GMPS, the GEPS is not configured with theGGCU. A fully configured GEPS can support 512 TRXs.

Figure 3-6shows the fully configured GEPS with E1 transmissions on the interfaces of theGEPS.


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Figure 3-6Fully configured GEPS

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GTCS

The GTCS implements the transcoding, rate adaptation, and sub-multiplexing functions. The

BSC6000 is configured with 14 GTCSs in the GBCR or the GBSR.

When the BSC6000 uses E1 transmissions on the A interface, a GTCS provides a maximumof 3,840 speech channels. Figure 3-7shows a fully configured GTCS in this case.

Figure 3-7Fully configured GTCS (with E1 transmissions on the A interface)

1300 01 02 03 07060504 08 09 10 1211

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When the BSC6000 uses STM-1 transmissions on the A interface, a GTCS provides a

maximum of 7,680 speech channels. Figure 3-8shows a fully configured GTCS.


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System Description


Figure 3-8Fully configured GTCS (with STM-1 transmissions on the A interface)

1300 01 02 03 07060504 08 09 10 1211

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3.1.5 Board

Table 3-1lists the boards of the BSC6000.

Table 3-1Boards of the BSC6000

Board Full Name

GGCU GSM General Clock Unit

GSCU GSM Switching and Control Unit

GTNU GSM TDM switching Network Unit

GXPUM GSM eXtensible Processing Unit for Main service

GXPUC GSM eXtensible Processing Unit for Cell broadcast service

GEIUB GSM E1/T1 Interface Unit for aBis

GEIUP GSM E1/T1 Interface Unit for Pb

GEIUT GSM E1/T1 Interface Unit for aTer

GEIUA GSM E1/T1 Interface Unit for A

GOIUB GSM Optic Interface Unit for aBis

GOIUP GSM Optic Interface Unit for Pb

GOIUT GSM Optic Interface Unit for aTer

GOIUA GSM Optic Interface Unit for A

GDPUC GSM Data Processing Unit for CS service


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All the boards in the BSC6000 are hot swappable. The GDPUC uses N+1 backup mode. Theother boards use 1+1 backup mode.

3.2 Logical StructureThe BSC6000 can logically be divided into:

TDM switching subsystem

GE switching subsystem

Service processing subsystem

Service control subsystem

Interface and signaling processing subsystem

Clock subsystem

Figure 3-9shows the logical structure of the BSC6000.

Figure 3-9Logical structure of the BSC6000 system

TDM switching subsystem

GE switching subsystem

Clock subsystem

Servicecontrol

subsystem

Serviceprocessing

subsystem

Interface

andsignaling

processing

subsystem

E1/STM-1 to BTS

E1/STM-1 to MSC

E1/STM-1 to PCU

Cascading

connection

between subracks

Cascading

connection

between subracks

Table 3-2describes the function of each subsystem in the BSC6000.

Table 3-2BSC6000 function description

Subsystem Function Description

TDM switchingsubsystem

Implements the TDM timeslot switching and interconnectionbetween the service boards and between the subracks.

GE switching

subsystem

Implements the switching and interconnection of the PS data and

the signaling between service boards and between subracks,

including the backboard, switching network and systeminterconnection unit.


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System Description


Subsystem Function Description

Service processingsubsystem

Implements radio frame protocol processing and voice serviceprocessing.

Service controlsubsystem

Implements the signaling processing, call processing and resourcemanagement.

Interface andsignaling processingsubsystem

Provides external physical interface (such as A and Abisinterfaces).

Implements the TDM service access.

Terminates the link layer.

Implements the processing function of the transmission layer.

Clock subsystem Implements the system clock function.

Integrates stratum 3 clock. It implements the system internal clock

distribution function.

3.3 Hardware Configuration

A BSC6000 is configured with one GBCR and 03 GBSRs according to the actual servicecapacity requirements and the GTCS configuration mode.

3.3.1 Minimum Configuration

When the GTCS is installed together with all the other subracks, the minimum configurationof the BSC6000 requires only one cabinet, as shown in Figure 3-10.

Figure 3-10BSC6000 minimum configuration (with the GTCS and all the other subracks in onecabinet)

Cabinet 1

GTCS

GMPS

GIMS

When the GTCS is installed at the MSC side, the minimum configuration of the BSC6000

requires two cabinets, as shown in Figure 3-11.


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System Description


Whether the GTCSs are installed at the MSC side, the maximum configuration of theBSC6000 requires four cabinets, as shown in Figure 3-13.

Figure 3-13BSC6000 maximum configuration (with the GTCSs at the MSC side)

Cabinet 1

GEPS

GMPS

GIMS

Cabinet 2

GEPS

GEPS

Cabinet 3

GTCS

GTCS

GTCS

Cabinet 4

GTCS

Maximum Configuration with STM-1 Transmissions on the A Interface

When the A interface uses STM-1 transmissions, the BSC6000 can be configured with oneGMPS, three GEPSs, and two GTCSs.

When the GTCSs are installed together with the other subracks, the maximum configuration

of the BSC6000 requires four cabinets, as shown in Figure 3-14.

Figure 3-14BSC6000 maximum configuration (with the GTCSs installed together with all theother subracks)

Cabinet 1

GEPS

GMPS

GIMS

Cabinet 2

GTCS

GEPS

GEPS

Cabinet 3

GTCS

Whether the GTCSs are installed at the MSC side, the maximum configuration of theBSC6000 requires three cabinets, as shown in Figure 3-15.


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Figure 3-15BSC6000 maximum configuration (with the GTCSs at the MSC side)

Cabinet 1

GEPS

GMPS

GIMS

Cabinet 2

GEPS

GEPS

Cabinet 3

GTCS

GTCS

3.3.3 Typical Configuration

The typical configuration of the BSC6000 is shown in Table 3-3. The operators can choose aproper configuration according to the actual requirements.

Table 3-3BSC6000 typical configuration

Configuration NumberofCabinets

Number ofFull-RateTRXs

Remarks

1xGMPS+1xGTCS+GIMS 1 512 The Abis and Ater interfaces use E1 orSTM-1 transmissions.

The A interface uses E1 transmissions.

1xGMPS+1xGTCS+GIMS 1 512 The Abis and Ater interfaces use E1 or

STM-1 transmissions.

The A interface uses STM-1 transmissions.

1xGMPS+1xGEPS+GIMS+2xGTCS

2 1,024 The Abis and Ater interfaces use E1 orSTM-1 transmissions.





1xGMPS+3xGEPS+GIMS

+4xGTCS

3 2,048 The Abis and Ater interfaces use E1 or

STM-1 transmissions.






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System Description


3.4 GTCS

3.4.1 Overview of the GTCS

The GDPUC in the GTCS performs transcoding and rate adaptation. The GEIUT or GOIU inthe GMPS (or GEPS), and that in the GTCS implement sub-multiplexing functions.

GDPUC

In the Public Switched Telephone Network (PSTN), the voice coding scheme is pulsecode modulation (PCM) and the rate is 64 kbit/s. In the GSM, to save radio channel

resources, the voice coding scheme is RPE-LTP or CELP and the rate is 13 kbit/s(through a 16 kbit/s channel). To enable a fixed phone to call a GSM mobile station, the

voice must go through code speed adjustment. Therefore, the GDPUC performstranscoding and rate adaptation.

GEIUT/GOIUT

If 64 kbit/s links are used to transmit 16 kbit/s signals, transmission resources are wasted.

To save land line resources, four 16 kbit/s channels are combined into 64 kbit/s channels.Therefore, the GEIUT/GOIUT is required to perform sub-multiplexing.

3.4.2 Connection Between BSC6000 Subracks

Figure 3-16shows the connection between the GMPS/GEPS and the GTCS.

Figure 3-16Connection between the GMPS/GEPS and the GTCS

GMPS/GEPS

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Ater A

The GMPS/GEPS connects with the GTCS through the Ater interface, and the GTCSconnects with the MSC through the A interface.

The GTCS can be configured in an independent GBSR on the MSC side. When the GTCS isconfigured on the MSC side, you need to configure signaling links and O&M links on the

Ater interface.

The signaling links are used for service communications between the GMPS/GEPS and theGTCS. The O&M links are used for operations and maintenance of the GTCS.

Figure 3-17shows the links on the Ater interface.


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Figure 3-17Links on the Ater interface

GMPS/GEPS GTCS

BSC side MSC side

Ater signaling link

Ater O&M link

Both the A and Ater interfaces support E1 transmissions and STM-1 transmissions. Figure 3-16takesE1 transmissions as an example.

For a fully configured GTCS, refer to section 3.1.4 Service SubrackFor the procedure for installing

the GTCS on the MSC side, refer to section 8.1 Hardware Installation.

3.4.3 Features of the GTCSThe GTCS of the BSC6000 has the following features:

Supports FR/EFR/HR/AMR services

The GDPUC in the GTCS encodes the 64 kbit/s PCM data from the A interface using avoice algorithm and then sends 8 kbit/s or 16 kbit/s TARU frames to the Ater interface.The GDPUC decodes the 8 kbit/s or 16 kbit/s TARU frames from the Ater using thevoice algorithm and then sends 64 kbit/s PCM data to the A interface.

Supports transparent and non-transparent transmissions of CS data servicesThe GDPUC does not change data but converts the format of data frames. It converts the

unlink 8 kbit/s or 16 kbit/s frames into 64 kbit/s ITU-T V.110 frames and sends the

converted frames to the MSC.The GDPUC also converts the downlink 64 kbit/s ITU-T V.110 frames into 8 kbit/s or 16kbit/s GDPUC frames and sends the converted frames to the BSC.

Manages the TC resource poolThe Transcoder Controller (TCC) module detects the states of the GDPUC and the DSP

of the GDPUC. It adds normal TC resources to the resource pool and deletes abnormal

TC resources from the resource pool.when a call is initiated, the TCC assigns a TC resource to the call and deletes the

resource from the resource pool. When the call is over, the TCC puts the TC resourcepreviously used by the call into the resource pool for future assignment.

The management of the TC resource pool equalizes the load on the DSPs relatively. TheTC resources for one DSP are discontinuously distributed in the resource pool. If one call

being processed by the DSP has a quality problem, the quality of the other successive(tens of) calls being processed by the DSP is not affected.TC resources have priority levels that are configured through the LMT. The TCC moduleassigns TC resources by priority levels. This assignment mechanism can be used todetect the speech quality of specific TC resources.

Performs operation and maintenance functionsWhen the GTCS is configured on the MSC side, configure two O&M links on the Ater

interface to perform the operations and maintenance of the GTCS. The two links work inactive/standby mode. The bandwidth of each link is 1%64 kbit/s to 30%64 kbit/s.

3.4.4 Capacity of the GTCS

Table 3-4lists the capacity of the boards in the GTCS and that of the A interface boards.


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System Description


Table 3-4Capacity of the boards in the GTCS and of the A interface boards

Board Capacity

GDPUC 960 speech channels

GEIUT 3,840 speech channels

32 E1 links

GEIUA 960 CICs

32 E1 links

GOIUA 1,920 CICs

1 STM-1 port that bears 63 routes of E1 signals

When the transmission mode on the A interface varies, the number of boards in a fully

configured GTCS varies.

Table 3-5lists different numbers of boards in a fully configured GTCS.

Table 3-5Numbers of boards in a fully configured GTCS

TransmissionMode on theA Interface

Number of AInterfaceBoards

Number of AterInterface Boards (forE1 Transmissions)

Number of GDPUCs

E1

transmission

8 GEIUAs 2 GEIUTs 5, working in 4+1 backup

mode

STM-1transmission

8 GOUIAs 4 GEIUTs 9, working in 8+1 backupmode

The GEIUA/GOIUA/GEIUT works in active/standby mode.

The GDPUC works in N+1 backup mode.

When the transmission mode on the A interface varies, the capacity of a fully configured

GTCS is different.

When the BSC6000 uses E1 transmissions on the A interface, the BSC6000 has amaximum of four GTCSs that are placed in two GBSRs. Table 3-6 lists the capacityspecifications of the GTCS.

Table 3-6Capacity specifications of the GTCS (with E1 transmissions on the A interface)

NumberofGTCSs

NumberofGBSRs

Number ofCICs on theA Interface

Number ofE1 Links onthe AInterface

Number of E1Links on theAter Interface

Traffic(Erl)

1 1 3,840 128 32 3,000

2 1 76,80 256 64 6,000


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NumberofGTCSs

NumberofGBSRs


Number ofE1 Links onthe AInterface


Traffic(Erl)

3 1 11,520 384 96 9,000

4 2 15,360 512 128 12,000

When the BSC6000 uses STM-1 transmissions on the A interface, the BSC6000 can hasa maximum of two GTCSs that are placed in one GBSR. Table 3-7 lists the capacityspecifications of the GTCS.

Table 3-7Capacity specifications of the GTCS (with STM-1 transmissions on the A interface)

NumberofGTCSs

NumberofGBSRs


Number ofOptical Portson the AInterface


Traffic(Erl)

1 1 7,680 1 64 6,000

2 1 15,360 2 128 12,000


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System Description 4 Functions


4 FunctionsAbout This Chapter


Title Description

4.1 Basic Functions Introduces the basic functions of the BSC6000.

4.2 Optional Functions Introduces the optional functions of the BSC6000.


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4 Functions


System Description


4.1 Basic Functions

4.1.1 Band Supporting

The BSC6000 supports the 850 MHz, 900 MHz, 1800 MHz, and 1900 MHz frequencies

specified in the ETSI GSM specifications.

4.1.2 Service Provisioning

The BSC6000 supports tele-services and Circuit Switched domain (CS) data services.

The teleservice includes:

Telephone service

Emergency call service Point-to-point short message service

G3 fax

The CS service includes:

9.6 kbit/s transparent or nontransparent data service

4.8 kbit/s transparent or nontransparent data service

2.4 kbit/s transparent or nontransparent data service)

4.1.3 Mobility Management

The mobility management includes the location updating, International Mobile SubscriberIdentity (IMSI) attach and detach, paging, and authentication.

4.1.4 Cell Selection

The BSC6000 supports the cell selection and reselection.

4.1.5 Call Control

The BSC6000 supports call control, immediate assignment, and assignment, and callreestablishment.

4.1.6 Handover

As a way of radio link control, a handover enables conversations through different cells. A

handover can adjust the traffic volume of a cell to optimize the overall performance of thesystem.

Handover algorithms consist of:

Basic handover algorithm

Power BudGeT (PBGT) handover algorithm

Signal level rapid dropping handover algorithm

Load handover algorithm


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Layered and hierarchical handover algorithm

Speed-sensitive handover algorithm

Directed retry algorithm

SDCCH handover algorithm

These algorithms can improve the quality of customer services and that of the network, and

lower call drops during handovers.

4.1.7 Power Control

The BSC6000 supports static power control, dynamic power control, and enhanced powercontrol algorithm.

4.1.8 Measurement Report

The BSC6000 supports the processing and preprocessing of measurement report (MR).

4.1.9 Adjustment of Adaptive Timing Advance

The BSC6000 supports the adjustment of the adaptive timing advance. This function ensuresthe radio signaling arrive at the BTS on time without mistake.

4.1.10 Radio Resource Management

The BSC6000 supports the TRX management, radio link management, radio common channel

management, radio dedicated channel management, and enhanced channel assignment

algorithm.

4.1.11 System InformationThe system information includes the primary parameters of the radio network on the Uminterface. These primary parameters include network identification parameters, cell selection

parameters, system control parameters, and network function parameters.

By receiving the system information, the MS can correctly access and select the network, andmake full use of all kinds of services the network provides.

4.1.12 O&M Functions

For details, see section 5.2 O&M Function."

4.1.13 LAPD Multiplexing on the Abis InterfaceIn the BSC6000 system, the Abis interface board supports N:1 multiplexing mode that isspecified for the RSL and OML signaling channels. The speech channel uses an exclusive

mode. In this mode, a full-rate speech channels uses 16 kbit/s and that a half-rate speechchannel uses 8 kbit/s.

4.1.14 Reliability and Maintainability

For details, see 6 "Reliability."


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4 Functions


System Description


4.1.15 A Interface Functions

The BSC6000 implements the following function on the A interface.

Ater interface 4:1 multiplexing

The BSC6000 supports 4:1 multiplexing on the Ater interface, that is, through the Ater

interface board, four timeslots on E1 of the A interface can be multiplexed to one timeslot on

the Ater interface.

14-digit signaling point code

The BSC6000 connects to the MSC through the SS7 signaling system. The SS7 signalingsystem uses 14-bit signaling point code and 24-bit signaling point code.

Circuit management

The BSC6000 supports circuit management on the A interface. This management consists of:

Assigning circuit on the A interface Blocking the circuit

Unblocking the circuit

Group blocking the circuit

Group unblocking the circuit

Providing maintenance and control over the single circuit or the PCM circuit group ofthe GEIUA and GDPUC

A interface protocol process

The BSC6000 processes the A interface-based signaling and protocol, includingconnectionless and connection-oriented SCCP.

A Interface Occupation Rate Monitoring

This function is used to monitor the occupation rate and usage status of the circuit on the A

interface and the TC resources by performance measurement.

4.1.16 Supporting Three-Digit MNC

All the cells under the BSC6000 support both 2-digit and 3-digit MNC. The operators can

choose one according to the network planning.

4.1.17 STM-1

The BSC6000 supports the STM-1 optical transmission on the A, Ater, Abis, and Pb interfaces.

This function can reduce the cabling and lower the maintenance workload for the operators.The use of optical interface on the A interface can improve the integration level of the GTCS.

4.1.18 Message Tracing

BSC6000 performs message tracing and user tracing on the following interfaces:

A interface

Abis interface

Um interface

Pb interface


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BSC-CBC interface

The message tracing can help locate problems and improve the maintenance efficiency.

4.1.19 Cell Frequency Scan

Cell frequency scan is used to detect the uplink and downlink receive power levels at allfrequencies in a specific frequency band. The scan provides frequency reference forconfiguration engineers; thus improving the accuracy in frequency configuration.

4.1.20 TCH Reassignment

When a TCH assignment fails, the reassignment is performed to effectively improve thesuccess rate of the assignment procedure, thus improving the success rate of access.

4.2 Optional Functions4.2.1 SDCCH Dynamic Adjustment

If users in a cell increase in a short time, many users fail to access the network because of

insufficient SDCCHs. In this situation, the SDCCH dynamic adjustment function can convertthe TCH into SDCCH dynamically to enable more users to access the network.

4.2.2 PDCH Dynamic Adjustment

The function can effectively improve the channel usage, reduce the maintenance and

configuration task, and increase the revenue of the operators.

The circuit service has the higher priority to obtain the channel than the packet service. The

PCU releases the dynamic PDCH when there are too many idle PDCHs.

4.2.3 Concentric Cell

The concentric cell technology divides an ordinary cell into two service layers: overlaid

subcell and underlaid subcell.

For the MSs in the underlaid subcell, try to distribute the less-reused frequency, such as the

BCCH frequency.

For the MSs in the overlaid subcell, try to distribute the more-reused frequency, such as the

frequencies other than the BCCH frequency.

The system capacity can be improved by using the more-reused frequency in the overlaidsubcell.

4.2.4 Enhanced Full Rate

The Enhanced Full Rate (EFR) can provide better speech quality. It can improve the speech

quality when the full rate is used on the air interface.


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4 Functions


System Description


4.2.5 Half Rate

Half Rate

With the increase of the subscribers, the frequency resources of the current GSM networkbecome insufficient. The half rate function can improve the capacity of the current networkwithout any hardware investment.

To enable the half rate function, the Transcoder & Rate Adaptation Unit (TRAU) needs to

support the half rate coding. Huawei TRAU supports all series of voice coding. It candynamically assign various voice coding resources according to the service assignment

requirements.

Dynamical Adjustment of Full Rate-Half Rate

When the BSS is configured with half rate function and the dynamical adjustment of full

rate-half rate function is enabled, the half rate and the full rate can be converted to each otherdynamically. The system can automatically adjust the ratio between full rate and half rate

channel.

With the dynamical adjustment between the full rate channel and half rate channel, the

following situation can be avoided: some channels are congested while others are idle becauseof the fixed configuration of channels.

You can also adjust the ratio between full rate and half rate channel for the whole network by

setting relevant parameters.

4.2.6 Ciphering

The BSC6000 uses the A5/1 and A5/2 ciphering algorithms. All the voice information andsignaling information transmitted in the air interface are ciphered by the A5/1 and A5/2ciphering algorithms to ensure the security of the network.

4.2.7 Short Message Service Cell Broadcast

The Short Message Service Cell Broadcast (SMSCB) is a teleservice (TS23) that can

periodically broadcast messages to all the MSs in a specified area. The MSs can receive thebroadcast messages continuously or discontinuously according to the system configuration.

The typical application of this function is to provide the weather information and trafficinformation.

4.2.8 Frequency HoppingThe frequency hopping (FH) means that the carrier containing meaningful information hops

under the control of a sequence. This sequence is called frequency-hopping sequence (HSN).

According to time domain, the FH mode can be divided into frame FH and timeslot FH.According to carrier mode, it can be divided into RF FH and base band FH.

Huawei BSC6000 realizes the baseband FH and RF FH at the timeslot level, and the baseband

FH and RF FH at the frame level.


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4.2.9 TRX Mutual-Assistance

With the TRX Mutual-assistance function, a cell can automatically handle the BCCH TRX

failure or baseband FH TRX failure. Thus, the cell services are not affected before the faulty

TRX is replaced.

The TRX mutual-assistance consists of BCCH TRX assistance and baseband FH TRX

assistance.

4.2.10 Satellite Transmission

The BSC6000 supports satellite transmissions on the Abis, A, Ater, and Pb interfaces. The

satellite transmissions enable the network deployment in the area where regular landtransmissions are not allowed.

4.2.11 Extended Cell

The extended cell breaks the restriction of 35 km coverage radius. Supported by BTShardware, a cell can cover an area with a radius of up to 120 km.

4.2.12 GPRS

The BSC6000 supports GPRS services. It connects to the PCU through the Pb interface. With

open system architecture, the Huawei GPRS system supports smooth capacity expansion. Thestandard interfaces ensure good compatibility of the equipment.

Huawei GPRS supports QoS and dynamic allocation of radio resources. At the same time, the

flexible networking and configuration can save large amount of investment cost for theoperators. Huawei GPRS provides rich packet services, such as,

Mobile Internet access

E-commerce, including e-bank and e-currency

Group management

Remote control and test

4.2.13 EGPRS

The Enhanced GPRS (EGPRS) is the enhanced version of the GPRS. The EGPRS adopts the

latest MCS1MSC9 coding, and introduces the 8PSK modulation to the RF layer. Thetheoretical maximum transmission rate of the EGPRS is 473.6 kbit/s.

4.2.14 2G/3G InteroperabilityThe 2G/3G interoperability function enables the 3G subscribers to roam to the 2G network.

This can solve the insufficient coverage problem in the early period of the 3G network. At the

same time, the 2G can also smoothly evolve to the 3G, which can protect the operator'sinvestment on 2G.

4.2.15 Multi-Band Networking

The BSC6000 supports the single BSC dual-band network and the GSM900/DCS1800 hybrid

cell.

Single BSC Dual-band network

The BSC6000 supports dual-band network, which is the combination of GSM900


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4 Functions


System Description


network and DCS1800 network. In a dual-band network, a dual-band MS can usefrequencies between the GSM900 babd and the DCS1800 band to make calls. Each cell

in the dual-band network can use only one frequency. The dual-band network allows cellreselection, allocation, and handover between GSM900 cells and DCS1800 cells.

GSM900/DCS1800 hybrid cellThe BSC6000 supports GSM900/DCS1800 hybrid cell function, which means the

GSM900 and DCS1800 frequencies lie in the same cell.

The biggest advantage of GSM900/DCS1800 hybrid cells is that the secondaryfrequency band and the primary frequency band are the same. The secondary frequencyband is the extension of the primary frequency band. It solves the cell reselection

Documents

31027718-HUAWEI BSC6000 System Description