BSC6000 Architecture and Principle

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HUAWEI BSC6000 Base Station Controller

Architecture and Principle Contents

Issue 02 (2007-02-06) Huawei Technologies Proprietary i

Contents

1 General Structure.......................................................................................................................1-1

1.1 Hardware Structure ......................................................... .............................................................. ................1-2

1.1.1 Overview of BSC6000 Hardware Structure.........................................................................................1-2

1.1.2 Cabinet.................................................................................................................................................1-4

1.1.3 GIMS .......................................................... .............................................................. ...........................1-6

1.1.4 Service Subrack ...................................................................... ............................................................. 1-7

1.1.5 Boards ...................................................... .......................................................... ................................1-10

1.2 Software Structure.......................................................................................................................................1-11

1.2.1 Host Software.....................................................................................................................................1-11

1.2.2 O&M Software...................................................................................................................................1-12

1.3 Logical Structure.........................................................................................................................................1-12

1.3.1 Overview of the Logical Structure.....................................................................................................1-12

1.3.2 TDM Switching Subsystem ......................................................................... ......................................1-13

1.3.3 GE Switching Subsystem...................................................................................................................1-13

1.3.4 Service Processing Subsystem..................................................................... ......................................1-14

1.3.5 Service Control Subsystem................................................................ ................................................ 1-14

1.3.6 Interface and Signaling Processing Subsystem..................................................................................1-14

1.3.7 Clock Subsystem................................................................................................................................1-14

1.3.8 O&M Subsystem................................................................................................................................1-14

1.3.9 Environment Monitoring Subsystem ................................................................ .................................1-15

2 TDM Switching Subsystem.....................................................................................................2-1


2.2 Logical Structure...........................................................................................................................................2-2

2.2.1 Overview of the Logical Structure.......................................................................................................2-2

2.2.2 TDM Switching Unit ........................................................... ................................................................ 2-4

2.2.3 TDM Access Bearer Unit.....................................................................................................................2-6

2.2.4 TDM Processing Bearer Unit...............................................................................................................2-7

3 GE Switching Subsystem .........................................................................................................3-1


3.1.1 Hardware Entities.................................................................................................................................3-2

3.1.2 Interconnection Schemes ............................................................ ......................................................... 3-2


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Contents


Architecture and Principle

ii Huawei Technologies Proprietary Issue 02 (2007-02-06)


3.2.1 CPU......................................................................................................................................................3-4

3.2.2 Network Unit ....................................................... ................................................................ ................3-4

3.2.3 Interface Unit .................................................................... ............................................................ .......3-4

3.3 GE Switching Features..................................................................................................................................3-4

4 Service Processing Subsystem.................................................................................................4-1



5 Service Control Subsystem ......................................................................................................5-1


5.2 Logical Function .......................................................... ......................................................................... ........5-2

5.2.1 Paging Control .................................................. .................................................................. .................5-2

5.2.2 System Information Management........................................................................................................5-25.2.3 Channel Assignment ........................................................... ................................................................. 5-3

5.2.4 BTS Public Service Management ................................................................... .....................................5-3

5.2.5 Call Control..........................................................................................................................................5-3

5.2.6 PS Service Control...............................................................................................................................5-3

5.2.7 Handover and Power Control...............................................................................................................5-4

5.2.8 Cell Broadcast Short Message Service.................................................................................................5-4

5.2.9 BTS Operation and Maintenance.........................................................................................................5-4

5.2.10 TC Resource Pool Management.........................................................................................................5-5

6 Interface and Signaling Processing Sub-system..................................................................6-16.1 Hardware Structure ......................................................... .............................................................. ................6-2


6.2.1 A Interface Processing Unit..................................................................................................................6-3

6.2.2 Abis Interface Processing Unit.............................................................................................................6-5

6.2.3 Ater Interface Processing Unit ........................................................................... ..................................6-6

6.2.4 Pb Interface Processing Unit................................................................................................................6-8

6.2.5 Cb Interface Processing Unit .............................................................. ................................................. 6-9

7 Clock Subsystem........................................................................................................................7-1

7.1 Structure of the Clock Subsystem ............................................................ ..................................................... 7-2

7.1.1 Hardware Structure ...................................................... .................................................................. ......7-2

7.1.2 Clock Subsystem Structure .................................................................... ..............................................7-2

7.2 Features of the Clock Subsystem ...................................................................... ............................................7-3

7.3 Clock Subsystem Control..............................................................................................................................7-4

8 System Signal Flow ...................................................................................................................8-1

8.1 CS Service Signal Flow.................................................................................................................................8-2

8.1.1 CS Service Signal Flow on the Uplink .................................................................... ............................8-2

8.1.2 CS Service Signal Flow on the Downlink............................................................................................8-2

8.2 PS Service Signal Flow.................................................................................................................................8-3


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Architecture and Principle Contents

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8.2.1 PS Service Signal Flow on the Uplink.................................................................................................8-3

8.2.2 PS Service Signal Flow on the Downlink.............................................................................. ..............8-3

8.3 Signaling Signal Flow........................................................... ................................................................. .......8-3

8.3.1 Signaling Signal Flow on the Abis Interface........................................................................................8-4

8.3.2 Signaling Signal Flow on the A Interface.............................................................................................8-4

8.3.3 Signaling Signal Flow on the Pb Interface...........................................................................................8-5

8.4 O&M Signal Flow.........................................................................................................................................8-6

9 O&M Subsystem........................................................................................................................9-1


9.2 Software Structure.........................................................................................................................................9-3

9.3 Security Management....................................................................................................................................9-3

9.3.1 Overview of Security Management .................................................................... .................................9-3

9.3.2 Authority Management .............................................................. .......................................................... 9-3

9.3.3 Log Management ................................................................ ................................................................. 9-4

9.4 Configuration Management...........................................................................................................................9-5

9.4.1 Overview of Configuration Management ............................................................ ................................9-5

9.4.2 Offline Data Configuration .................................................................... ..............................................9-5

9.4.3 Online Data Configuration...................................................................................................................9-5

9.4.4 Data Backup and Restoration...............................................................................................................9-5

9.5 Performance Management.............................................................................................................................9-5

9.5.1 Overview of the BSC6000 Performance Management .......................................................... ..............9-5

9.5.2 Performance Measurement Process .......................................................................... ...........................9-6

9.6 Alarm Management.......................................................................................................................................9-6

9.6.1 Overview of Alarm Management.........................................................................................................9-6

9.6.2 Alarm Process ............................................................ .................................................................... ......9-6

9.6.3 Alarm Box Drive..................................................................................................................................9-7

9.7 Loading Management....................................................................................................................................9-8

9.7.1 Overview of Loading Management ........................................................ .............................................9-8

9.7.2 Loading Software to the Boards in the GMPS or the GEPS................................................................ 9-9

9.7.3 Loading Software to the Boards in a Remote GTCS .......................................................... ............... 9-11

10 Environment Monitor Subsystem.......................................................................................10-1

10.1 Power System............................................................................................................................................10-2

10.1.1 Power Lead-In Part ........................................................... ............................................................... 10-2

10.1.2 Power Distribution Part....................................................................................................................10-3

10.2 Power Monitoring Function ................................................................ ...................................................... 10-3

10.3 Fan Monitoring Function .................................................................... ...................................................... 10-4


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Architecture and Principle Figures

Issue 02 (2007-02-06) Huawei Technologies Proprietary v

Figures

Figure 1-1 Hardware structure of the BSC6000.................................................................................................1-2

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

Figure 1-3 Alarm box .................................................... ........................................................... ..........................1-4

Figure 1-4 Configuration of the GBCR..............................................................................................................1-5Figure 1-5 Configuration of a GBSR .............................................................. ................................................... 1-6

Figure 1-6 Structure of a service subrack...........................................................................................................1-7

Figure 1-7 Fully configured GMPS....................................................................................................................1-8

Figure 1-8 Fully configured GEPS.....................................................................................................................1-9

Figure 1-9 Fully configured GTCS (with E1 transmissions on the A interface).................................................1-9

Figure 1-10 Fully configured GTCS (with STM-1 transmissions on the A interface)......................................1-10

Figure 1-11 Structure of the host software ................................................................... .................................... 1-11

Figure 1-12 Logical structure of the BSC6000.................................................................................................1-13

Figure 2-1 Logical structure of the TDM switching subsystem in the GMPS or GEPS.....................................2-3

Figure 2-2 Logical structure of the TDM switching subsystem in a GTCS ....................................................... 2-3

Figure 2-3 TDM switching in the GTNU...........................................................................................................2-4

Figure 2-4 Intra-subrack TDM interconnection..................................................................................................2-5

Figure 2-5 Inter-subrack TDM interconnections........................................................... .....................................2-5

Figure 2-6 TDM switching in an interface board .................................................................... ...........................2-6

Figure 2-7 TDM switching in the GDPUC.........................................................................................................2-7

Figure 3-1 GE interconnections in a subrack ................................................................ .....................................3-2

Figure 3-2 GE interconnections between subracks ................................................................ ............................3-3

Figure 3-3 GE interconnection between the main subrack and an extension subrack................. .......................3-3

Figure 4-1 Logical function of the DSP module.................................................................................................4-2

Figure 6-1 Interfaces of the BSC6000................................................................................................................6-3

Figure 6-2 Logical structure of the A interface processing unit.......................................................................... 6-4

Figure 6-3 Logical structure of the Abis interface processing unit.....................................................................6-5


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Figures



vi Huawei Technologies Proprietary Issue 02 (2007-02-06)

Figure 6-4 Logical structure of the Ater interface processing unit ................................................................... ..6-7

Figure 6-5 Logical structure of the Pb interface processing unit........................................................................6-8

Figure 6-6 Logical structure of the Cb interface processing unit ...................................................................... .6-9

Figure 7-1 Transmission of the reference clock for the GMPS or GEPS ........................................................... 7-3

Figure 7-2 Clock subsystem control...................................................................................................................7-4

Figure 8-1 CS service signal flow ................................................................. ..................................................... 8-2

Figure 8-2 PS service signal flow.......................................................................................................................8-3

Figure 8-3 Signaling signal flow on the Abis interface................................................................. .....................8-4

Figure 8-4 Signaling signal flow on the A interface ............................................................................ ...............8-5

Figure 8-5 Signaling signal flow on the Pb interface .......................................................................... ...............8-5

Figure 8-6 O&M signal flow of the BSC6000 ............................................................. ......................................8-6

Figure 9-1 Hardware structure of the O&M subsystem ................................................................. ....................9-2

Figure 9-2 BSC6000 performance measurement ........................................................................... ....................9-6

Figure 9-3 Alarm management mechanism........................................................................................................9-7

Figure 9-4 Alarm box drive .................................................................. .............................................................. 9-7

Figure 9-5 Software loading control...................................................................................................................9-9

Figure 10-1 Power lead-in part.........................................................................................................................10-2

Figure 10-2 Power monitoring principle ................................................................ ..........................................10-3

Figure 10-3 Fan monitoring principle ............................................................. ................................................. 10-4


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Architecture and Principle Tables

Issue 02 (2007-02-06) Huawei Technologies Proprietary vii

Tables

Table 1-1 Service subracks of the BSC6000.......................................................................................................1-7

Table 1-2 BSC6000 boards...............................................................................................................................1-10

Table 2-1 Boards of the TDM switching subsystem...........................................................................................2-2

Table 2-2 Logical units of the TDM switching subsystem......................................................................... ........2-2Table 4-1 Functional modules in the GDPUC.......................................................................... ..........................4-2

Table 6-1 Boards in the hardware of the interface and signaling processing subsystem ....................................6-2

Table 6-2 Functions of the boards in the interface and signaling processing subsystem....................................6-2

Table 6-3 Modules in the A interface processing unit.........................................................................................6-3

Table 6-4 Paths of the signaling stream and service stream from the A interface....................................... ........6-4

Table 6-5 Modules in the Abis interface processing unit....................................................................................6-5

Table 6-6 Paths of the signaling stream and service stream from the Abis interface................................ ..........6-5

Table 6-7 Modules in the Ater interface processing unit ......................................................................... ...........6-6

Table 6-8 Paths of the signaling stream and service stream from the Ater interface ..........................................6-7

Table 6-9 Modules in the Pb interface processing unit.......................................................................................6-8

Table 6-10 Paths of the signaling stream and service stream from the Pb interface...........................................6-9

Table 9-1 O&M software of the BSC6000 ........................................................................... ..............................9-3

Table 9-2 Authorities of the external users of the BSC6000...............................................................................9-3

Table 9-3 BSC6000 logs.....................................................................................................................................9-4


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Architecture and Principle 1 General Structure

Issue 02 (2007-02-06) Huawei Technologies Proprietary 1-1

1 General StructureAbout This Chapter

The following table lists the sections of this chapter.

Section Description

1.1 Hardware Structure Introduces the hardware structure of the BSC6000

1.2 Software Structure Introduces the software structure of the BSC6000

1.3 Logical Structure Introduces the logical structure of the BSC6000


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1 General Structure



1-2 Huawei Technologies Proprietary Issue 02 (2007-02-06)

1.1 Hardware Structure

1.1.1 Overview of BSC6000 Hardware StructureThe BSC6000 uses Huawei Platform of Advanced Radio Controller (PARC).

Figure 1-1 shows the hardware structure of the BSC6000.

Figure 1-1Hardware structure of the BSC6000O&M equipment room

Alarm box

LMT

LMT

Signal cable for

the alarm box

GBCR

Equipment roomOptical cable

to an NE

Trunk cable

to an NEPower cable

to the PDF

Straight-

through

cableGBSR GBSR

LMT: Local Maintenance Terminal GBCR: GSM BSC Control Processing Rack

GBSR: GSM BSC Service Processing Rack PDF: Power Distribution Frame

Cabinet

The BSC6000 uses Huawei N68-22 cabinets as its GSM BSC Control Processing Rack(GBCR) and GSM BSC Service Processing Racks (GBSRs). The cabinet design complieswith the IEC60297 and IEEE standards. The dimensions of both the GBCR and GBSRs are2200 mm (Height) % 600 mm (Width) % 800 mm (Depth).


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1 General Structure




Alarm Box

The BSC6000 uses the Huawei general GM12ALMZ alarm box.

The alarm box can connect to one of the following devices:

z LMT

z M2000 server

z GSM Back Administration Module (GBAM)

The alarm box emits audio and visual alarms when a running device in the system has faults.

Figure 1-3 shows the alarm box.

Figure 1-3Alarm box

1.1.2 Cabinet

GBCR

The GBCR processes the BSC6000 services and performs operations and maintenance. The

BSC6000 has one GBCR.

The GBCR has the following components:

z Two service subracks

z One keyboard, video, and mouse (KVM)

z One LAN switch

z One GBAM


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Figure 1-4 shows the configuration of the GBCR.

Figure 1-4Configuration of the GBCR

7

8

2

13

4

1

1

1

51

6

6

1

1

1

1. Dummy panel 2. GBAM 3. Cabling subrack

4. LAN switch 5. KVM 6. Service subrack

7. Air defence subrack 8. Power distribution box

GBSR

The GBSR processes the BSC6000 services. It holds only service subracks. The BSC6000 has

03 GBSRs. One GBSR contains a maximum of three service subracks.


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Figure 1-5 shows the configuration of a GBSR.

Figure 1-5Configuration of a GBSR

3

1

3

4

1

2

2

2

1. Dummy panel 2. Service subrack

3. Air defence subrack 4. Power distribution box

1.1.3 GIMS

In the GBCR, the KVM, LAN switch, and GBAM compose the GSM Integrated ManagementSystem (GIMS).

z KVM

The KVM is a device comprising a keyboard, a display (video), and a mouse. It is theoperating platform of the GBAM.


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Figure 1-8 shows the fully configured GEPS with E1 transmissions on the interfaces of theGEPS.

Figure 1-8Fully configured GEPS

1300 01 02 03 07060504 08 09 10 1211

GX

P

UM

GS

C

U

GT

N

U

2714 15 16 17 21201918 22 23 24 2625

GE

IUP

Rear

boards

Front

boards

Backplane

GE

IUP

GE

IUT

GE

IUT

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GE

IUB

GX

P

UM

GS

C

U

GT

N

U

GTCS

A GSM TransCoder Subrack (GTCS) performs transcoding, rate adaptation, and

sub-multiplexing. It can be configured in the GBCR or GBSR. One BSC6000 has 14

GTCSs.

When the BSC6000 uses E1 transmissions on the A interface, a GTCS provides a maximumof 3,840 speech channels. Figure 1-9 shows a fully configured GTCS in this case.

Figure 1-9Fully configured GTCS (with E1 transmissions on the A interface)

1300 01 02 03 07060504 08 09 10 1211

GD

P

UC

GS

C

U

GS

C

U

G

T

N

U

G

T

N

U

2714 15 16 17 21201918 22 23 24 2625

GE

I

UT

G

E

I

U

T

G

E

I

U

A

G

E

I

U

A

G

E

I

U

A

G

E

I

U

A

G

E

I

U

A

G

E

I

U

A

Rear

board

Front

board

Backplane

G

E

I

U

A

GE

I

UA

G

D

P

UC

G

D

P

UC

GD

P

UC

G

D

P

UC


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1 General Structure




z Middle ware

Middle wares such as the Distributed Object-oriented Programmable Real-time

Architecture (DOPRA) and PARC are used. They enable the upper application softwareto be independent of the lower operating system. Middle wares help you reuse the

software functions of different platforms.z Application software

Application software is used to perform the functions of different logical entities. Thesefunctions include:

Radio resource processing

Resource control plane processing

BTS management

Configuration management

1.2.2 O&M Software

The O&M software of the BSC6000 consists of the OMU software, LMT software, andM2000 software.

z OMU software

The OMU software runs on the GBAM. It performs O&M functions. The operatingsystem is Linux.

z LMT software

The LMT software is installed in an LMT (a local computer). It provides a Graphic User

Interface (GUI). The operating system is Windows 2000 Professional or Windows XPProfessional.

z M2000 software

The M2000 is Huawei's integrated network management system. It carries out networkconfiguration and centralized management of alarm and performance data.

The M2000 software consists of M2000 server software and M2000 client software.

The M2000 server software runs in Solaris and the database is Sybase.

The M2000 client software provides a GUI. It runs on Windows 2000 Professional orWindows XP Professional.

The LMT software cannot run on Windows 98.

1.3 Logical Structure

1.3.1 Overview of the Logical Structure

The BSC6000 consists of the following logical functional subsystems:

z TDM Switching Subsystem


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1 General Structure




For details about this subsystem, refer to chapter3 "GE Switching Subsystem."

1.3.4 Service Processing Subsystem

The service processing subsystem performs transcoding and rate adaptation functions

For details about this subsystem, refer to chapter4 "Service Processing Subsystem."

1.3.5 Service Control Subsystem

The service control subsystem performs the following functions:

z Paging control

z System information management

z Channel assignment

z BTS public service management

z Call controlz PS service control

z Handover and power control

z Cell broadcast short message service

z BTS operation and maintenance

z TC resource pool management

For details about this subsystem, refer to chapter5 "Service Control Subsystem."

1.3.6 Interface and Signaling Processing Subsystem

The interface and signaling processing subsystem performs the following functions:

z Providing the A, Abis, Pb, and Ater interfaces

z Processing data link layer signaling

z Processing cell broadcast message services

z Processing the SS7 MTP2 protocols

z Processing the LAPD protocol

For details about this subsystem, refer to chapter6 "Interface and Signaling ProcessingSub-system."

1.3.7 Clock SubsystemThe clock subsystem provides clock signals for the BSC6000.

For details about this subsystem, refer to chapter7 "Clock Subsystem."

1.3.8 O&M Subsystem

The O&M subsystem performs two types of functions: local O&M functions and centralizedO&M functions. Specifically, the two types of functions comprise:

z Security management

z Configuration management

z Performance management


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Architecture and Principle 2 TDM Switching Subsystem


2 TDM Switching SubsystemAbout This Chapter


Section Description

2.1 Hardware Structure Introduces the hardware structure of the TDM switchingsubsystem

2.2 Logical Structure Introduces the logical structure of the TDM switching subsystem


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2 TDM Switching Subsystem





Table 2-1 lists the boards of the TDM switching subsystem.

Table 2-1Boards of the TDM switching subsystemBoard Full Name

GTNU GSM TDM switching Network Unit

GDPUC GSM Data Processing Unit for CS 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

For the details about the boards, refer to theHUAWEI BSC6000 Base Station ControllerHardware Reference.


2.2.1 Overview of the Logical Structure

Table 2-2 lists the logical units of the TDM switching subsystem.

Table 2-2Logical units of the TDM switching subsystemLogical Unit Physical Entity

TDM switching unit GTNU

TDM access bearer unitGEIUB/GOIUB, GEIUP/GOIUP, GEIUT/GOIUT, andGEIUA/GOIUA

TDM processing bearer unit GDPUC


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Figure 2-1 shows the logical structure of the TDM switching subsystem in the GMPS orGEPS.

Figure 2-1Logical structure of the TDM switching subsystem in the GMPS or GEPS

TDM access bearer unit TDM switching unit

TDM access bearer unit TDM switching unit

GEPS

GMPS/GEPS

Inter-GTNU cable

Backplane

TDM path

Backplane

TDM path

In the GMPS or a GEPS, the TDM access bearer unit connects to the TDM switching unitthrough a backplane TDM path. The TDM switching unit in the GMPS or a GEPS connects to

the TDM switching unit in another GEPS through an inter-GTNU cable.

Figure 2-2 shows the logical structure of the TDM switching subsystem in a GTCS.

Figure 2-2Logical structure of the TDM switching subsystem in a GTCS

TDM accessbearer unit

TDM switching unit

TDM access

bearer unitTDM switching unit

GTCS

GTCS

TDM processing

bearer unit

TDM processing

bearer unit

BackplaneTDM path

Inter-GTNU

cable

Backplane

TDM path

Backplane

TDM path

BackplaneTDM path

In a GTCS, both the TDM processing bearer unit and the TDM access bearer unit connect tothe TDM switching unit through a backplane TDM path.

In different GTCSs, the TDM switching units are connected through an inter-GTNU cable.


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2.2.2 TDM Switching Unit

The TDM switching unit performs the TDM switching function. It provides CS switching for

the entire system.

Figure 2-3 shows the TDM switching in the GTNU.

Figure 2-3TDM switching in the GTNU

TDM switching unit

128Kx128K

Portson

the

panel

12

12

LVDS port

24

LVDS port

24

Portso

n

the

backplane

The GTNU performs the following functions:

z Performing 128K%128K TDM switching

z Providing 24 Low Voltage Differential Signal (LVDS) high-speed serial ports on itsbackplane

z Providing a port for each of the slots numbered 0003 and 0827

z Providing six ports (on its panel), each of which consists of two LVDS high-speed serialports working in active/standby ports

The LVDS refers to a signal interface level. Its features are high speed, anti-interference, and longtransmission distance.


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Intra-Subrack TDM Switching

Figure 2-4 shows the TDM interconnection between the two GTNUs and the other boards in

one subrack.

Figure 2-4Intra-subrack TDM interconnectionActive GTNU

Service board 1

Standby GTNU

Service board 2 Service board 24

Connection between a service board and the active

GTNU through a backplane TDM pathConnection between a service board and the standby

GTNU through a backplane TDM path

The GTNU works in active/standby mode. The other boards in the subrack connect to the

active and standby GTNUs through backplane TDM paths.

Inter-Subrack TDM Switching

Inter-subrack TDM switching is carried out through mesh interconnections. The GMPS and

the GEPSs are interconnected in mesh topology through the ports on the panels of the GTNUs

in these subracks. The GTCSs are interconnected in mesh topology through the ports on thepanels of the GTNUs in these subracks.

The BSC6000 supports the following mesh interconnections between a maximum of foursubracks:

z Mesh interconnections between the GMPS and three GEPSs

z Mesh interconnection between four GTCSs

Figure 2-5 shows the inter-subrack TDM interconnections.

Figure 2-5Inter-subrack TDM interconnectionsSubrack 1

Subrack 2 Subrack 4

Subrack 3


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2.2.3 TDM Access Bearer Unit

The TDM access bearer unit provides TDM bearers for the services on the A, Abis, Ater, and

Pb interfaces.

Figure 2-6 shows the TDM switching in an interface board.

Figure 2-6TDM switching in an interface board

TDM switching

module

32Kx32K

Portsonth

e

backplane

E1/T1 STM-1

or sub-board

LVDS port

2

221x8 Mbit/s HW

LVDS port

21x8 Mbit/s HW

The TDM switching module in an interface board provides 32K%32K timeslot switching. It

switches timeslots between the interface board and the backplane.


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2.2.4 TDM Processing Bearer Unit

The TDM processing bearer unit processes the TDM services of the GDPUC.

Figure 2-7 shows the TDM switching in the GDPUC.

Figure 2-7TDM switching in the GDPUC

TDM switching

module

16Kx16K

Portso

n

the

backplane

DSP

22x16 Mbit/s HW 2

LVDS port

2

LVDS port

22x16 Mbit/s HW

The TDM switching module on the GDPUC provides 16K%16K timeslot switching. It can

switch timeslots between the backplane and the Digital Signal Processing (DSP) module.


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Architecture and Principle 3 GE Switching Subsystem


3 GE Switching SubsystemAbout This Chapter


Section Description

3.1 Hardware Structure Introduces the hardware structure of the GE switchingsubsystem

3.2 Logical Structure Introduces the logical structure of the GE switchingsubsystem

3.3 GE Switching Features Introduces the features of GE switching


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Architecture and Principle 3 GE Switching Subsystem


Inter-Subrack Interconnection

Inter-subrack GE switching is carried out through star interconnections. The GMPS and the

GEPSs are interconnected in star topology through the ports on the panels of the GSCUs in

these subracks. The GTCSs are interconnected in star topology through the ports on the panels

of the GSCUs in these subracks.

The BSC6000 supports the following star interconnections between a maximum of four

subracks:

z The GMPS is connected with three GEPSs.

z The main GTCS is connected with three extension GTCSs.

Figure 3-2 shows the star GE interconnections between subracks.

Figure 3-2GE interconnections between subracksMain subrack

Extension

subrack

Extension

subrack

Extension

subrack

Figure 3-3 shows the GE interconnection between the main subrack and an extension subrack.

Figure 3-3GE interconnection between the main subrack and an extension subrackMain

subrackGSCU GSCU

GSCU GSCU

Extension

subrack

HiG

interconnection

HiG

interconnection

Crossover

cable

Crossover

cable


The GE switching subsystem is logically divided into the following units:

z Central Processing Unit (CPU)

z Network unit (GE switching module)

z Interface unit between the GSCU and the other boards


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3 GE Switching Subsystem




3.2.1 CPU

The CPU in the GSCU performs the following functions:

z Initiating the switching network

z Configuring the switching network

z Maintaining the switching network

z Testing the switching network

z Managing faults

z Managing Port Trunking

z Managing switchover

3.2.2 Network Unit

The network unit in the GSCU performs the following functions:

z Obtaining a Media Access Control (MAC) address, adding an address entry to ordeleting an address entry from the switching table

z Performing GE line speed forwarding

z Performing L2 unicast and broadcast

z Performing Port Trunking

3.2.3 Interface Unit

The interface unit in the GSCU transmits and receives Ethernet packets.

3.3 GE Switching Features

The GE switching subsystem has the following features:

z Star interconnections between the GSCU and the other boards in a service subrack

z Centralized and non-blocked line-rate layer-2 switching on the GSCU

z 60 Gbit/s line speed forwarding on the 60 ports on the GSCU

z Port Trunking on the ports of the GSCU


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Architecture and Principle 4 Service Processing Subsystem


The DSP module processes services as follows:

z Converts the service data from the TDM switching modules or forwards the data in twodirections

Encodes and decodes speech services

Performs the transcoding and rate adaptation of data services, the extended Tandem

Free Operation (TFO), and voice enhancement, and then outputs the processingresults from the DSP through the TDM switching module

z Receives maintenance and debugging commands from the network processing module

through the Universal Test & Operations Physical Interface for ATM (UTOPIA) andprocesses the commands before forwarding them


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Architecture and Principle 5 Service Control Subsystem


5 Service Control SubsystemAbout This Chapter


Section Description

5.1 Hardware Structure Describes the hardware structure of the service controlsubsystem

5.2 Logical Function Describes the logical structure of the service controlsubsystem


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5 Service Control Subsystem





The hardware of the service control subsystem consists of:z GXPUM

z GXPUC

z GBAM

z GSCU in a GTCS

5.2 Logical Function

The GXPUM is the core service processing unit of the BSC6000. It consists of four CPUs.

z CPU 0: performs paging control, system information management, channel assignment,and public service processing of the BTS

z CPUs 13: performs voice call control, PS service control, handover, and power control

The GXPUC broadcasts short messages over cells.

The GBAM performs the operation and maintenance of a BTS.

The GSCU in the GTCS manages the TC resource pool.

The following sections in this chapter describe the functions of the hardware in detail.

5.2.1 Paging ControlThe GXPUM performs paging control through the following software subsystems:

z Paging Control (PGC) software subsystem: distributes the paging messages from the A

and Pb interfaces to different Cell Service Process (CESP) software subsystems in theBSC

z CESP software subsystem: sends paging messages to cells

5.2.2 System Information Management

The CESP software subsystem of the GXPUM manages the system information. It generatesthe various types of system information defined in the protocols and sends the information to

cells or MSs.

The CESP software subsystem initiates a procedure for sending CS or packet switcheddomain (PS) system information in the following cases:

z Dynamic data configuration

z Change in BTS management states

z BTS request transmission

z PCU request transmission

z RSL recovery


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6 Interface and Signaling Processing Sub-system





The hardware of the interface and signaling processing subsystem consists of a few boards.Table 6-1 lists these boards.

Table 6-1Boards in the hardware of the interface and signaling processing subsystemBoard Full Name

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

Table 6-2 lists the functions of the boards in the interface and signaling processing subsystem.

Table 6-2Functions of the boards in the interface and signaling processing subsystemBoard Function

GXPUC Providing a cell broadcast short message interface (Cb interface) andprocessing the signaling between the BSC and the Cell BroadcastCenter (CBC)

GEIUB/GOIUB Providing Abis interfaces and processing the LAPD signaling on theAbis interfaces

GEIUP/GOIUP Providing Pb interfaces and processing the LAPD signaling on the Pb

interfaces

GEIUT/GOIUT z The GEIUT/GOIUT provides Ater interfaces.

z The GEIUT/GOIUT in the GMPS processes the MTP2 signaling andHDLC signaling on the Ater interface.

z The GEIUT/GOIUT in the GEPS processes the MTP2 signaling onthe Ater interface.

z The GEIUT/GOIUT in the GMPS and that in the GEPS process theMTP2 signaling on the A interface.

GEIUA/GOIUA Providing A interfaces


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6 Interface and Signaling Processing Sub-system




6.2.3 Ater Interface Processing Unit

Table 6-7 lists the modules in the Ater interface processing unit.

Table 6-7Modules in the Ater interface processing unitModule Description

E1/STM-1 interface modulefor the Ater interface

z Configured on the GEIUT/GOIUT in the GMPS/GEPS

z Provides E1/STM-1 ports

HDLC module z Configured on the GEIUT/GOIUT in the GMPS/GTCS

z Processes HDLC/PPP protocols

z Provides IP communications between the interface boardsin the GMPS/GEPS and those in the GTCS

MTP2 module z Configured on the GEIUT/GOIUT in the GMPS/GEPS

z Processes MTP2 signaling


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Architecture and Principle 9 O&M Subsystem


9 O&M SubsystemAbout This Chapter


Section Description

9.1 Hardware Structure Introduces the hardware structure of the O&M subsystem

9.2 Software Structure Introduces the software structure of the O&M subsystem

9.3 Security Management Describes the security management function of the O&M

subsystem

9.4 ConfigurationManagement

Describes the configuration management function of theO&M subsystem

9.5 Performance Management Describes the performance management function of theO&M subsystem

9.6 Alarm Management Describes the alarm management function of the O&M

subsystem

9.7 Loading Management Describes the loading management function of the O&Msubsystem


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9 O&M Subsystem




User Level Authority

Administrator This level is the highest level. In addition to the authorities that Operators

have, users of this level can manage users.

Custom Administrators define the authorities of this level.

The security management also includes NE operation time management. It limits theoperation time limit of users by date, week, and time segment. Users can carry out operations

only in the predefined time limit.

9.3.3 Log Management

The BSC6000 records three kinds of logs when it is functional. Table 9-3 lists these logs.

Table 9-3BSC6000 logsLog Type Description

Running log Records the information about system running status

Operation log Records the information about operations and maintenance

performed by the users

Debug log Records the information about the location and analysis ofinternal problems

The BSC6000 log management performs the following functions:

z Querying operation logs conditionally

You can enter query conditions on the LMT to view only the logs that meet theseconditions.

z Querying and setting the uploaded parameters

The log files in the GBAM can be automatically uploaded to a specified FTP server. You

can set and query the uploaded parameters.

z Uploading log files manually

The log files in the GBAM are uploaded to the specified FTP server. After the upload

parameters are set, the GBAM uploads the log files automatically. You can also startuploading log files manually.

z Setting log parameters

You can set the log parameters, such as the type and size of the log files, on the LMT.

z Saving the logs stored in the buffer to files by force

The GBAM saves the log information in the buffer and records the log files after the loginformation reaches a certain size. The LMT also has this function.

z Querying GBAM log files

You can query the information about the current log files. The information includes filesize and file name.


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Figure 9-5 shows the software loading control of the BSC6000.

Figure 9-5Software loading control

G

S

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U

G

E

I

U

T

G

SC

U

G

S

C

U

BSC side

GBAM

G

SC

U

G

S

C

U

G

E

I

U

T

MSC side

Subrack1

Subrack2

Subrack1'

Subrack2'

SubrackN'

Subrack0

Subrack0'

SubrackN

Ater O&M link

G

S

C

U

G

S

C

U

G

S

C

U

The maintenance information of the software loading control is transmitted in three modes.

z The maintenance information between subracks is transmitted through starinterconnections between GSCUs.

z The maintenance information in a service subrack is transmitted between the GSCU andthe other boards through the backplane.

z The maintenance information between the local and the remote service subracks istransmitted through Ater O&M links.

9.7.2 Loading Software to the Boards in the GMPS or the GEPS

The process of loading software to the boards in the GMPS or GEPS consists of:

z Loading the GSCU Software

z Loading Software to the Other Boards

Loading the GSCU Software

The process of loading the GSCU software is as follows:

Step 1 After the GSCU starts up, it broadcasts the BOOTP request.z If the GBAM is online, it processes and responds to the request.

z If the GBAM is not started or is offline, the GSCU starts up and loads data from its own

flash memory, acts as a second-level loading control center, and then processes theBOOTP requests of the other boards.


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----End

9.7.3 Loading Software to the Boards in a Remote GTCS

The GSCU in the main GTCS on the MSC side is a second-level loading control center. Theloading of the remote GTCSs can be independent on the Ater O&M link to some extent.

z When the Ater O&M link is broken, the GSCU in the main GTCS processes the loadingrequests from the boards in the subrack.

z When the Ater O&M link is normal, the GSCU in the GMPS processes all the loadingrequests from the remote GTCSs and the GSCU in the GTCS stops working as a loadingcontrol center.

Loading the GSCU Software

The process of loading the GSCU software in a GTCS is as follows:

Step 1 After the local GEIUT starts up, it sets up a Ater O&M link to the remote GEIUT.Step 2 The remote GEIUT sends a BOOTP request to the GSCU in the same subrack.

The GSCU cannot process the request before its startup.

Step 3 The remote GEIUT sends a BOOTP request on the Ater O&M link.Step 4 The local GEIUT receives the BOOTP request on the Ater O&M link and broadcasts the

request on the GE ports over the local subrack.

Step 5 The GSCU in the GMPS receives the BOOTP request, responds with a message, processesthe request, and then loads the software to the remote GEIUT on the Ater O&M link.

Step 6 The remote GSCU after power-on sends a BOOTP request to the GSCU in the GMPS throughthe Ater O&M link.

Step 7 The transmission of the BOOTP request varies:z If the Ater O&M link is normal, the BOOTP request is sent to the GSCU in the GMPS.

On receiving the request, the GSCU loads the software to the remote GSCU.

z If the Ater O&M link is broken, the BOOTP request cannot be sent to the GSCU in the

GMPS. The GSCU in the main GTCS at the remote end starts up from its flash memoryand acts as a remote loading control center. When the Ater O&M link goes back to thenormal state, the remote loading control center stops processing the BOOTP requestsfrom the other boards in the remote GTCS.

----End

Loading Software to the Other Boards

The process of loading software to the remote service boards is similar to that of loading

software to the local service boards. The differences are as follows:

z The files downloaded from the GBAM are first saved in the remote loading controlcenter before being downloaded to the other boards.

z The remote service boards download files through Ater O&M links, which work in

active/standby mode. The bandwidth of each Ater O&M link is 1%64 kbit/s to 30%64

kbit/s.


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Architecture and Principle 10 Environment Monitor Subsystem


10 Environment Monitor SubsystemAbout This Chapter


Section Description

10.1 Power System Introduces the power system in the environment monitor

subsystem

10.2 Power Monitoring

Function

Describes the power supply monitoring function of the

environment monitor subsystem

10.3 Fan Monitoring Function Describes the fan monitoring function of the environmentmonitor subsystem


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Documents

BSC6000 Architecture and Principle