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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
2.1 Hardware Structure ......................................................... .............................................................. ................2-2
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 Hardware Structure ......................................................... .............................................................. ................3-2
3.1.1 Hardware Entities.................................................................................................................................3-2
3.1.2 Interconnection Schemes ............................................................ ......................................................... 3-2
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HUAWEI BSC6000 Base Station Controller
Architecture and Principle
ii Huawei Technologies Proprietary Issue 02 (2007-02-06)
3.2 Logical Structure...........................................................................................................................................3-3
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
4.1 Hardware Structure ......................................................... .............................................................. ................4-2
4.2 Logical Structure...........................................................................................................................................4-2
5 Service Control Subsystem ......................................................................................................5-1
5.1 Hardware Structure ......................................................... .............................................................. ................5-2
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 Logical Structure...........................................................................................................................................6-3
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
Issue 02 (2007-02-06) Huawei Technologies Proprietary iii
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
9.1 Hardware Structure ......................................................... .............................................................. ................9-2
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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HUAWEI BSC6000 Base Station Controller
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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Architecture and Principle
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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HUAWEI BSC6000 Base Station Controller
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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HUAWEI BSC6000 Base Station Controller
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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1.1 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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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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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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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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HUAWEI BSC6000 Base Station Controller
Architecture and Principle 2 TDM Switching Subsystem
Issue 02 (2007-02-06) Huawei Technologies Proprietary 2-1
2 TDM Switching SubsystemAbout This Chapter
The following table lists the sections of 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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2.1 Hardware Structure
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 Logical Structure
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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Architecture and Principle 2 TDM Switching Subsystem
Issue 02 (2007-02-06) Huawei Technologies Proprietary 2-5
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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Architecture and Principle 2 TDM Switching Subsystem
Issue 02 (2007-02-06) Huawei Technologies Proprietary 2-7
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
Issue 02 (2007-02-06) Huawei Technologies Proprietary 3-1
3 GE Switching SubsystemAbout This Chapter
The following table lists the sections of 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
Issue 02 (2007-02-06) Huawei Technologies Proprietary 3-3
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
3.2 Logical Structure
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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3.2.1 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
Issue 02 (2007-02-06) Huawei Technologies Proprietary 4-3
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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HUAWEI BSC6000 Base Station Controller
Architecture and Principle 5 Service Control Subsystem
Issue 02 (2007-02-06) Huawei Technologies Proprietary 5-1
5 Service Control SubsystemAbout This Chapter
The following table lists the sections of 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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Architecture and Principle
5-2 Huawei Technologies Proprietary Issue 02 (2007-02-06)
5.1 Hardware Structure
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
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Architecture and Principle
6-2 Huawei Technologies Proprietary Issue 02 (2007-02-06)
6.1 Hardware Structure
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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6.2.3 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
Issue 02 (2007-02-06) Huawei Technologies Proprietary 9-1
9 O&M SubsystemAbout This Chapter
The following table lists the sections of 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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Architecture and Principle
9-4 Huawei Technologies Proprietary Issue 02 (2007-02-06)
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
C
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
Issue 02 (2007-02-06) Huawei Technologies Proprietary 10-1
10 Environment Monitor SubsystemAbout This Chapter
The following table lists the sections of 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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