bss system description(v900r008c01_01)
Post on 02-Jun-2018
235 Views
Preview:
TRANSCRIPT
-
8/10/2019 BSS System Description(V900R008C01_01)
1/81
HUAWEI BSC6000 Base Station Subsystem
V900R008
BSS System Description
Issue 01
Date 2008-06-10
INTERNAL
Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
-
8/10/2019 BSS System Description(V900R008C01_01)
2/81
Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any
assistance, please contact our local office or company headquarters.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: support@huawei.com
Copyright Huawei Technologies Co., Ltd. 2008. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective holders.
Notice
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but the statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
http://www.huawei.com/mailto:support@huawei.commailto:support@huawei.comhttp://www.huawei.com/ -
8/10/2019 BSS System Description(V900R008C01_01)
3/81
-
8/10/2019 BSS System Description(V900R008C01_01)
4/81
3.5 BSC Hardware Configuration.........................................................................................................................3-7
3.6 OM of the BSC................................................................................................................................................3-7
4 Introduction to the PCU............................................................................................................4-1
4.1 Introduction to the Built-in PCU.....................................................................................................................4-24.2 Introduction to the External PCU....................................................................................................................4-4
4.2.1 PCU Physical Structure..........................................................................................................................4-4
4.2.2 PCU Software Structure.........................................................................................................................4-6
4.2.3 PCU Logical Structure...........................................................................................................................4-8
4.2.4 PCU Physical Ports................................................................................................................................4-9
4.2.5 PCU Technical Specifications................................................................................................................4-9
4.2.6 PCU Operation and Maintenance.........................................................................................................4-12
5 Introduction to the BTS.............................................................................................................5-1
5.1 Introduction to the BTS3012...........................................................................................................................5-35.2 Introduction to the BTS3012AE.....................................................................................................................5-6
5.3 Introduction to the BTS3006C......................................................................................................................5-10
5.4 Introduction to the BTS3002E......................................................................................................................5-12
5.5 Introduction to the DBS3900 GSM...............................................................................................................5-14
5.6 Introduction to the BTS3900 GSM...............................................................................................................5-17
5.7 Introduction to the BTS3900A GSM............................................................................................................5-20
6 Introduction to the BSS OM Subsystem............................................................................... 6-1
6.1 Huawei Mobile Network OM System.............................................................................................................6-2
6.2 OM System of 2G RAN Devices....................................................................................................................6-3
Contents
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
ii Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://0.0.0.0/ -
8/10/2019 BSS System Description(V900R008C01_01)
5/81
Figures
Figure 1-1Position of the BSS in the GSM.........................................................................................................1-2
Figure 1-2Structure of the BSS...........................................................................................................................1-3
Figure 1-3BSS external interfaces.......................................................................................................................1-4
Figure 1-4BSS internal interfaces.......................................................................................................................1-5
Figure 2-1Channel assignment procedure...........................................................................................................2-4
Figure 2-2Immediate assignment procedure.......................................................................................................2-5
Figure 2-3Authentication procedure....................................................................................................................2-6
Figure 2-4Encryption procedure.........................................................................................................................2-7
Figure 2-5Basic principles of power control.....................................................................................................2-10
Figure 2-6Power control decision procedure of Huawei II power control algorithm.......................................2-11
Figure 2-7Power control decision procedure of Huawei III power control algorithm......................................2-12
Figure 3-1Physical structure of the BSC.............................................................................................................3-3
Figure 3-2Structure of the host software.............................................................................................................3-4
Figure 3-3Structure of the OMU software..........................................................................................................3-5Figure 3-4LMT software structure......................................................................................................................3-5
Figure 3-5Logical structure of the BSC..............................................................................................................3-6
Figure 4-1Logical structure of the built-in PCU.................................................................................................4-3
Figure 4-2Physical structure of the PCU.............................................................................................................4-5
Figure 4-3Fully configured PCU processing subrack (front subrack)................................................................4-5
Figure 4-4Fully configured PCU processing subrack (rear subrack)..................................................................4-6
Figure 4-5Software structure of the PCU............................................................................................................4-7
Figure 4-6Logical structure of the PCU..............................................................................................................4-8
Figure 4-7OM network of the PCU...................................................................................................................4-13
Figure 5-1BTS3002E system architecture..........................................................................................................5-3
Figure 5-2Logical structure of the BTS3012 with the QTRU.............................................................................5-5
Figure 5-3Logical structure of the BTS3012 with the DTRU.............................................................................5-5
Figure 5-4BTS3012AE system architecture........................................................................................................5-6
Figure 5-5Logical structure of the BTS3012AE (DC)........................................................................................5-8
Figure 5-6Logical structure of the BTS3012AE with the QTRU (AC)..............................................................5-9
Figure 5-7Logical structure of the BTS3012AE with the DTRU (AC)..............................................................5-9
Figure 5-8BTS3006C system architecture........................................................................................................5-10
Figure 5-9Logical structure of the BTS3006C..................................................................................................5-12
Figure 5-10BTS3002E system architecture......................................................................................................5-13
HUAWEI BSC6000 Base Station Subsystem
BSS System Description Figures
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
iii
-
8/10/2019 BSS System Description(V900R008C01_01)
6/81
Figure 5-11Logical structure of the BTS3002E................................................................................................5-14
Figure 5-12DBS3900 GSM system architecture...............................................................................................5-15
Figure 5-13Logical structure of the BBU3900 GSM........................................................................................5-16
Figure 5-14Logical structure of the RRU3004..................................................................................................5-17
Figure 5-15BTS3900 GSM system architecture...............................................................................................5-18
Figure 5-16Logical structure of the BTS3900 GSM.........................................................................................5-20
Figure 5-17BTS3900A GSM system architecture............................................................................................5-21
Figure 5-18Logical structure of the BTS3900A GSM......................................................................................5-22
Figure 6-1Huawei mobile network OM system..................................................................................................6-2
Figures
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
iv Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
7/81
Tables
Table 2-1handover type and the corresponding decision mode..........................................................................2-9
Table 3-1Components of the BSC.......................................................................................................................3-3
Table 4-1PCU physical ports...............................................................................................................................4-9
Table 4-2Working environment specifications of the PCU..............................................................................4-10
Table 4-3Noise and safety specifications of the PCU.......................................................................................4-11
Table 4-4Power supply and power consumption of the PCU...........................................................................4-11
Table 4-5Maximum capacity of a PCU processing subrack.............................................................................4-12
Table 4-6Minimum capacity of a PCU processing subrack..............................................................................4-12
HUAWEI BSC6000 Base Station Subsystem
BSS System Description Tables
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
v
-
8/10/2019 BSS System Description(V900R008C01_01)
8/81
-
8/10/2019 BSS System Description(V900R008C01_01)
9/81
About This Document
Purpose
This document describes the Huawei BSS system. It covers the introductions to the BSS, BSC,
built-in PCU, external PCU, BTS, and BSS OM system. In addition, it introduces the functions
of the BSS.
Product Versions
The following table lists the product versions related to the document.
Product Name Model Product Version
BSC BSC6000 V900R008C01
BTS BTS3012 V300R004&V300R005&V300R006
BTS3012AE V300R005&V300R006
BTS3006C V300R005&V300R006
BTS3002E V300R005
BTS3036/BTS3900
GSM
V300R008
BTS3036A/BTS3900A
GSM
V300R008
DBS3036/DBS3900
GSM
V300R008
PCU PCU6000 V300R008
Intended Audience
This document is intended for:
l Network planners
l Field engineers
l System engineers
l Shift operators
HUAWEI BSC6000 Base Station Subsystem
BSS System Description About This Document
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
1
-
8/10/2019 BSS System Description(V900R008C01_01)
10/81
l Network operators
l Network administrators
Change HistoryFor changes in the document, refer to Changes in BSS System Description.
Organization
1 Introduction to the BSS
This describes the base station subsystem (BSS), which is controlled by an MSC. The BSS serves
as a communication bridge between the MSs and the MSC. The BSS transmits and receives
radio signals and manages radio resources.
2 BSS Functions
The BSS functions include radio resource management, connection management, BTS
management, and BSS OM.
3 Introduction to the BSC
This introduces the BSC. Physically, the BSC system is composed of the BSC hardware system
and the BSC software system. Logically, it consists of eights subsystems.
4 Introduction to the PCU
This introduces the PCU. The PCU provides packet data services. The main functions of the
PCU include packet radio resource management, packet calls control, and packet datatransmission. Huawei BSS supports built-in PCU and external PCU.
5 Introduction to the BTS
This topic describes the BTS. The BTS is an NE in the GSM network. It sends RF signals to the
MS and receives RF signals from the MS to achieve radio coverage. The BTS is connected to
the BSC through the Abis interface.
6 Introduction to the BSS OM Subsystem
This introduces the BSS OM subsystem. Huawei BSS system provides comprehensive operation
and maintenance tools, such as the M2000, a core operation and maintenance tool for Huawei
mobile networks, and the complete operation and maintenance tools for 2G radio access network.
Conventions
1. Symbol Conventions
The following symbols may be found in this document. They are defined as follows
Symbol Description
DANGER
Indicates a hazard with a high level of risk that, if not avoided,
will result in death or serious injury.
About This Document
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
11/81
Symbol Description
WARNING
Indicates a hazard with a medium or low level of risk which, if
not avoided, could result in minor or moderate injury.
CAUTION
Indicates a potentially hazardous situation that, if not avoided,
could cause equipment damage, data loss, and performance
degradation, or unexpected results.
TIP Indicates a tip that may help you solve a problem or save your
time.
NOTE Provides additional information to emphasize or supplement
important points of the main text.
2. General Conventions
Convention Description
Times New Roman Normal paragraphs are in Times New Roman.
Boldface Names of files,directories,folders,and users are in boldface. For
example,log in as user root.
Italic Book titles are in italics.
Courier New Terminal display is in Courier New.
3. Command Conventions
Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italic.
[ ] Items (keywords or arguments) in square brackets [ ] are optional.
{x | y | ...} Alternative items are grouped in braces and separated by vertical
bars.One is selected.
[ x | y | ... ] Optional alternative items are grouped in square brackets and
separated by vertical bars.One or none is selected.
{ x | y | ... } * Alternative items are grouped in braces and separated by vertical
bars.A minimum of one or a maximum of all can be selected.
[ x | y | ... ] * Alternative items are grouped in braces and separated by vertical
bars.A minimum of zero or a maximum of all can be selected.
4. GUI Conventions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description About This Document
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
3
-
8/10/2019 BSS System Description(V900R008C01_01)
12/81
Convention Description
Boldface Buttons,menus,parameters,tabs,window,and dialog titles are in
boldface. For example,click OK.
> Multi-level menus are in boldfaceand separated by the ">" signs.
For example,choose File > Create > Folder .
5. Keyboard Operation
Convention Description
Key Press the key.For example,press Enterand press Tab.
Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+A
means the three keys should be pressed concurrently.
Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the two
keys should be pressed in turn.
6. Mouse Operation
Action Description
Click Select and release the primary mouse button without moving the
pointer.
Double-click Press the primary mouse button twice continuously and quickly
without moving the pointer.
Drag Press and hold the primary mouse button and move the pointer
to a certain position.
About This Document
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
4 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
13/81
1Introduction to the BSSAbout This Chapter
This describes the base station subsystem (BSS), which is controlled by an MSC. The BSS serves
as a communication bridge between the MSs and the MSC. The BSS transmits and receives
radio signals and manages radio resources.
1.1 BSS in the GSM System Architecture
This describes the BSS in the GSM system architecture. The global system for mobile
communications (GSM) is the second generation mobile telephone system. The BSS functions
as the radio access network for the GSM.
1.2 BSS Structure
This describes the structure of the BSS. The BSS comprises the BSC, PCU, and BTS.
1.3 BSS External Interfaces
This describes the BSS external interfaces. The BSS provides 3GPP-compliant standard
interfaces and private interfaces. The standard interfaces are the Um interface, the A interface,
the BSC-CBC interface, and the Gb interface. These standard interfaces enable the
interconnection and interworking of different vendors' equipment. One example of the private
interface is the Itf-N interface.
1.4 BSS Internal Interfaces
This describes the BSS internal interfaces. These interfaces are the Abis interface, the Pb
interface, and the Itf-S interface. The BSS provides private interfaces to the internal devices.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 1 Introduction to the BSS
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
1-1
-
8/10/2019 BSS System Description(V900R008C01_01)
14/81
1.1 BSS in the GSM System Architecture
This describes the BSS in the GSM system architecture. The global system for mobile
communications (GSM) is the second generation mobile telephone system. The BSS functions
as the radio access network for the GSM.
Figure 1-1shows the position of the BSS in the GSM.
Figure 1-1Position of the BSS in the GSM
BTS
BTS
BTS
BSC
PCU
MSC
SGSN
HLR
GGSN
MS
MS
MS
BSS NSS
PDN
The GSM consists of the following three parts:
l Mobile station (MS): provides main-machine interfaces and various services to subscribers.
l Base station subsystem (BSS): performs functions such as the transmission and reception
of radio signals and the management of radio resources.
NOTE
Huawei BSS supports built-in PCU and external PCU.
l Network subsystem (NSS): performs functions such as circuit switching, packet switching,
and network interconnection.
1.2 BSS StructureThis describes the structure of the BSS. The BSS comprises the BSC, PCU, and BTS.
The BSC and BTS are network elements. The PCU can be configured either in the BSC (called
built-in PCU) or outside the BSC (called external PCU).
Figure 1-2shows the structure of the BSS.
1 Introduction to the BSS
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
1-2 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
15/81
Figure 1-2Structure of the BSS
BSS BSS
BTSBTS
BSC PCU BSC PCU
M2000
The PCU can be configured
inside or outside the BSC.
MSMS
PS CoreCS Core
The components of the BSS are described as follows:
Each BSS system consists of one BSC, one or more PCUs, and one or more BTSs.
l The BSC plays a control role in the BSS.
l The PCU provides packet data services. When the PCU is configured in the BSC, the PCU
is an integral part of the BSC. When the PCU is configured outside the BSC, the PCU isan independent network element.
l The BTS is an NE in the GSM network. It sends RF signals to the MS and receives RF
signals from the MS to achieve radio coverage. The operation and maintenance of the BTS
is performed through the BSC.
The M2000 is an element management system (EMS) of the BSS. You can use the M2000 to
maintain the BSC, built-in PCU, and external PCU. You can also use the M2000 to maintain the
BTS through the BSC.
1.3 BSS External Interfaces
This describes the BSS external interfaces. The BSS provides 3GPP-compliant standard
interfaces and private interfaces. The standard interfaces are the Um interface, the A interface,
the BSC-CBC interface, and the Gb interface. These standard interfaces enable the
interconnection and interworking of different vendors' equipment. One example of the private
interface is the Itf-N interface.
Figure 1-3shows the BSS external interfaces.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 1 Introduction to the BSS
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
1-3
-
8/10/2019 BSS System Description(V900R008C01_01)
16/81
Figure 1-3BSS external interfaces
BSS
Um
A GbBSC-CBC
Itf-N
BTS
BSC PCU
M2000 NMS
The PCU can be configuredinside or outside the BSC.
SGSNCBCMSC
MS
l Um interface: between the MS and the BSS
l A interface: between the BSS and the MSC
l
Gb interface: between the BSS and the SGSNl BSC-CBC interface: between the BSS and the CBC
l Itf-N interface: between the BSS and the NMS
1.4 BSS Internal Interfaces
This describes the BSS internal interfaces. These interfaces are the Abis interface, the Pb
interface, and the Itf-S interface. The BSS provides private interfaces to the internal devices.
Figure 1-4shows the BSS internal interfaces.
1 Introduction to the BSS
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
1-4 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
17/81
Figure 1-4BSS internal interfaces
BTS
BSC PCU
M2000Itf-S
Pb
Abis
The PCU can be configured
inside or outside the BSC.
l Abis interface: between the BTS and the BSC. The BSC controls and manages the BTS on
the Abis interface.
l Pb interface: between the BSC and the external PCU.
l Itf-S interface: between the M2000 and the BSC or external PCU. This interface serves
maintenance of the NEs.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 1 Introduction to the BSS
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
1-5
-
8/10/2019 BSS System Description(V900R008C01_01)
18/81
-
8/10/2019 BSS System Description(V900R008C01_01)
19/81
2BSS FunctionsAbout This Chapter
The BSS functions include radio resource management, connection management, BTS
management, and BSS OM.
2.1 Radio Resource Management
This describes the radio resource management (RRM) functions of the BSS. RRM is the
procedure through which a stable connection is established between the MS and the MSC for a
call. This procedure is also used to release the radio resources when a call is disconnected.
2.2 Connection Management
This describes the connection management of the BSS. Connection management is a function
for the control, assignment, and management of the services provided by the network. The
services are short message services (SMSs), teleservices, and location-based services.
2.3 BTS Management
This describes the BTS management function. BTS management is a function where procedures
and messages related to the BTS are performed. The procedures and messages such as the BTS
software downloading, BTS data configuration, BTS status management, and BTS alarms
management should be performed by the peer-layer entities of the BSC and BTS.
2.4 BSS Operation and Maintenance
This describes the OM functions of the BSS. The BSS provides OM functions, such as,
performance management, BTS OM, BSC OM, clock control setting, BSC alarms, BTS alarms,BTS commissioning, dynamic data configuration, GUI, and integrated network management
interfaces.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-1
-
8/10/2019 BSS System Description(V900R008C01_01)
20/81
2.1 Radio Resource ManagementThis describes the radio resource management (RRM) functions of the BSS. RRM is the
procedure through which a stable connection is established between the MS and the MSC for a
call. This procedure is also used to release the radio resources when a call is disconnected.
The limited radio resources must be dynamically allocated to maintain the stable connection
between the MS and the MSC. The RRM is mainly performed by the MS and the BSC. In
addition, the RRM maintains the channel connection when an MS is handed over to a neighbor
cell.
2.1.1 Paging
This describes the paging procedure. Paging is a broadcast procedure used by the network to
search for an MS. On receiving a call, the GSM/GPRS network initiates broadcasting in the
location area or routing area of the paged MS. For a PS service, paging can be performed on the
basis of the location area but is mainly performed on the basis of the routing area. Which areathe paging is based on is determined by the SGSN.
2.1.2 Assignment
This describes the assignment procedure. Through the assignment procedure, the BSS assigns
a TCH to an MS.
2.1.3 Initial Access and Immediate Assignment
This describes the initial access and immediate assignment procedures. The purpose of initial
access is to set up a radio resource (RR) connection on the Um interface between an MS and the
network. The purpose of immediate assignment is to assign a signaling channel for setting up
the RR connection.
2.1.4 Authentication and EncryptionThis describes the authentication and encryption procedures. Authentication and encryption are
two security mechanisms used by the GSM network to enhance network security and data
privacy.
2.1.5 System Information
This describes system information (SI). The SI contains the main radio network parameters on
the Um interface. These parameters include network identification parameters, cell selection
parameters, system control parameters, and network function parameters.
2.1.6 Handover
Handover is a procedure in which a conversation can be sustained when an MS moves from one
cell to another in order to meet the requirement of network management.
2.1.7 Radio Channel Management
This describes the radio channel management procedure. Radio channel management is
performed by the BSC. It consists of long-term channel configuration management and short-
term dedicated channel assignment management. The long-term management function is used
to select the channel sequence number and to configure relevant devices. The short-term
management function is used to assign and release various channels during communication.
2.1.8 Power Control
This describes power control. Power control aims to reduce the transmit power of the MS or the
BTS under the condition that the radio link quality is maintained and the power level of the MS
and the BSS is met. Through power control, the system interference is reduced, the frequency
spectrum efficiency is improved, and the standby time of the MS is extended.
2.1.9 Circuit Management
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-2 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
21/81
This describes the circuit management procedure. The BSC can manage the circuits on the A
interface. For example, it performs circuit assignment, circuit blocking, circuit unblocking,
circuit group blocking, and circuit group unblocking. It also operates and maintains a single
circuit or the PCM group circuits of the GEIUA/GOIUA.
2.1.10 TRX ManagementThis describes the TRX management procedure. TRX management refers to TRX status
management.
2.1.11 Media Access Control
This describes Media Access Control (MAC).
2.1.12 Radio Link Control
This describes Radio Link Control (RLC).
2.1.1 Paging
This describes the paging procedure. Paging is a broadcast procedure used by the network to
search for an MS. On receiving a call, the GSM/GPRS network initiates broadcasting in the
location area or routing area of the paged MS. For a PS service, paging can be performed on the
basis of the location area but is mainly performed on the basis of the routing area. Which area
the paging is based on is determined by the SGSN.
Paging can be classified into the following types:
l CS service paging
l PS service paging
2.1.2 Assignment
This describes the assignment procedure. Through the assignment procedure, the BSS assigns
a TCH to an MS.
After an MS initiates the service request, the BSC assigns a TCH to the MS through the
assignment procedure. If there are idle TCHs in the cell where the MS initiates the call, the BSC
assigns a TCH to the MS. Huawei BSC uses Huawei Channel Algorithm II, which ensures that
an optimal channel is assigned to the MS. Figure 2-1shows the assignment procedure. For
detailed assignment procedure, refer to Speech Channel Assignment Procedure.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-3
http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
22/81
Figure 2-1Channel assignment procedure
Channel Activation
Channel Activation
Acknowledge
MS BTS MSC
Assignment Command
BSC
Assignment
Request
Assignment
Complete
UA
SABM
Establishment Indication
Assignment
Complete
If there is no idle TCH in the cell where the MS initiates a call, you can set related parameters
to enable the BSC to perform directed retry. Then, the BSC assigns an idle TCH in another cell
to the MS. The Huawei BSC can determine which neighbor cell is optimal based on measurementresults. Then, the cell is used as the optimal target cell during directed retry.
Upon receiving an assignment failure message on the Um interface, the BSC reassigns a channel
on another carrier frequency in the same cell to the MS. If there is no other carrier frequency in
the same cell, the BSC selects the original carrier frequency to assign a channel.
NOTE
If the BSC has assigned a TCH to the MS during the immediate assignment, the BSC does not assign a new
TCH to the MS during the assignment procedure. Instead, the BSC modifies the mode of the assigned TCH for
service transmission.
2.1.3 Initial Access and Immediate AssignmentThis describes the initial access and immediate assignment procedures. The purpose of initial
access is to set up a radio resource (RR) connection on the Um interface between an MS and the
network. The purpose of immediate assignment is to assign a signaling channel for setting up
the RR connection.
The initial access is a procedure of random access, as shown in Figure 2-2. For detailed
procedure, refer to Immediate Assignment Procedure.
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-4 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
23/81
Figure 2-2Immediate assignment procedure
Channel Request
MS BTS BSC
SABM
UA
Establish Indication
Channel Activation
Channel Required
Channel Activation Acknowledge
Immediate Assignment Command
2.1.4 Authentication and Encryption
This describes the authentication and encryption procedures. Authentication and encryption are
two security mechanisms used by the GSM network to enhance network security and data
privacy.
Authentication
Authentication is the procedure through which the network checks the validity of the IMSI or
TMSI transmitted on the Um interface to verify the identity of an MS.
The purpose of authentication is to prevent unauthorized subscribers from accessing the network
and to protect the private information of authorized subscribers. The authentication and
encryption procedures are performed by the Authentication Triplet, namely RAND, Kc, and
SRES. They are generated by the GSM authentication center. Figure 2-3shows the
authentication procedure. For detailed authentication procedure, refer to Authentication
Procedure.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-5
http://-/?-http://-/?-http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
24/81
Figure 2-3Authentication procedure
Ki RAND
A3
SRES
AUC
Equal
Authentication
success
KiRAND
A3
SRES
MS Network
Authentication provides protection through the following measures:
l Checking the validity of a subscriber through the authentication center (AuC) when the
subscriber tries to access the network
l Encrypting the messages on the radio channels
l Using the information stored in the EIR to identify an MS
l Using the TMSI instead of the IMSI during communications
l Using the PIN to protect the SIM
Encryption
Encryption is an important function of the GSM network. It ensures the security of the messages
exchanged between an MS and the BTS. The signaling, speech, and data transmitted on the Um
interface are encrypted to achieve data privacy.
GSM protocols define eight encryption algorithms: A5/0 to A5/7. A5/0 indicates Not ciphered.
At present, A5/2 encryption algorithm is deciphered. The GSM association allows all countries
to apply for A5/1 encryption algorithm or A5/3 encryption algorithm. A5/3 encryption algorithm
is preferentially used because it achieves the best security.
The BSC and the MS need to be configured to support the encryption function. In addition, theencryption capabilities of the BTS and the MS determine the encryption algorithm to be used.
The RRM entity determines whether an encryption mode is used. If the encryption is initiated
by the network, the BTS encrypts the messages that are sent to the MS. Figure 2-4shows the
encryption procedure. For detailed encryption procedure, refer to Ciphering Procedure.
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-6 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
25/81
Figure 2-4Encryption procedure
Ki RAND
A8
Kc
AUC
KiRAND
MS BSS
TDMA
frame No.
A5
Kc
A8
A5
TDMA
frame No.
NSS
Unencrypted
messages
Unencrypted
messages
2.1.5 System Information
This describes system information (SI). The SI contains the main radio network parameters on
the Um interface. These parameters include network identification parameters, cell selection
parameters, system control parameters, and network function parameters.
Depending on the received system information, the MS chooses the network for access and
makes full use of various services provided by the network.
Based on the functions, the system information is categorized into:
l Basic system information, including SI1, SI2, SI2bis, SI2ter, SI3, SI4, SI5, SI5bis, SI5ter,
and SI6.
l GPRS-supportive system information, including SI7, SI8, and SI13.
l 2G-3G handover and reselection-supportive system information, including SI2QUATER.
l Packet system information (PSI), including PSI1, PSI2, PSI3, PSI3bis, PSI4, PSI5, and
PSI13.
Based on the transmission channel of system information, the system information can be
classified into broadcast messages and associated messages.
l Broadcast messages
When an MS is in idle mode, it communicates with the network through system information
broadcast. Through system information broadcast, the MS obtains information on currentlocation, service types, and cell reselection parameters.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-7
-
8/10/2019 BSS System Description(V900R008C01_01)
26/81
Broadcast messages include SI1, SI2, SI2BIS, SI2TER, SI3, SI4, SI7, SI8, SI2QUATER,
and SI13.
If the cell is configured with a PBCCH, the types of PSI that can be broadcast on the PBCCH
are PSI1, PSI2, PSI3, PSI3bis, PSI4, and PSI5.
l Associated messages
When an MS is not in idle mode, it communicates with the network through associated
system information. The network uses the associated system information to control the
transmission, power, and handover of an MS.
The related system information is System Information Types 5, 5bis, 5ter, and 6.
If the cell is configured with a PACCH, the packet system information is periodically
broadcast to the MSs in transmission state on the PACCH.
If the cell is configured with a PBCCH, PSI1 is broadcast to the MSs in transmission
state periodically on the PACCH.
If the cell is not configured with the PBCCH, the PSI13 is broadcast to the MSs in
transmission state periodically on the PACCH.
NOTE
System information type 9 contains the allocation information on the BCCH. If a system information type
9 is sent, the reception location of system information type 9 is specified in system information type 3.
System information type 9 is rarely used.
2.1.6 Handover
Handover is a procedure in which a conversation can be sustained when an MS moves from one
cell to another in order to meet the requirement of network management.
Handover procedure is quite complex. It consists of handover initiation, handover preparation,handover decision based on the handover algorithm, and handover execution. Handover helps
to adjust the traffic in the cell to avoid call drops. In addition, handover helps to minimize the
cross interference, thus optimizing the overall performance of the network.
Handover is controlled by the network. Based on home NEs of systems of cells, handover is
categorized into:
l Intra-cell handover
l Intra-BSC handover
l Inter-BSC handover
l Inter-MSC handover
l 2G-3G handover
During the handover procedure, the MS and the BTS measure the current radio links, combine
the measurement results of uplinks and downlinks into one measurement report, and then send
the measurement report to the BSC for analysis.
l For intra-cell handover and intra-BSC handover, the BSC performs the handover decision
based on the handover algorithm and notifies the MSC of the handover after the handover
is complete.
l For inter-BSC handover, inter-MSC handover, and 2G-3G handover, the BSS initiates the
handover request and the MSC performs the handover decision based on the measurementreports of the BSS.
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-8 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
27/81
Based on the emergency degree of the network, the handover algorithm decides the handover
in the sequence of emergency handover, load handover, and general handover.
Table 2-1lists the handover type and the corresponding decision mode.
Table 2-1handover type and the corresponding decision mode
Handover Type Decision Mode
Emergency handover l Timing advance (TA) handover
l Bad quality (BQ) handover
l Quick drop handover
l Interference handover
General handover l Edge handover
l
Power Budget (PBGT) handoverl Concentric cell handover
l AMR handover
l Better 3G cell handover
l Fast movement handover from a micro cell to a
macro cell
Load handover l Load handover
l Inter-layer (better cell) handover
2.1.7 Radio Channel Management
This describes the radio channel management procedure. Radio channel management is
performed by the BSC. It consists of long-term channel configuration management and short-
term dedicated channel assignment management. The long-term management function is used
to select the channel sequence number and to configure relevant devices. The short-term
management function is used to assign and release various channels during communication.
Radio channel management is performed during the establishment, maintenance, modification,
and release of a connection. The radio channel management can be classified as follows:
l Common channel management, that is, common control channel management. Huawei
BSS supports the management of six common channels, namely, PCH, RACH, AGCH,
PPCH, PRACH, and PAGCH.
l Dedicated channel management, that is, the assignment, activation, release, management,
and reporting of various dedicated channels such as SDCCH, SACCH, TCH, and PDCH.
2.1.8 Power Control
This describes power control. Power control aims to reduce the transmit power of the MS or the
BTS under the condition that the radio link quality is maintained and the power level of the MS
and the BSS is met. Through power control, the system interference is reduced, the frequencyspectrum efficiency is improved, and the standby time of the MS is extended.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-9
-
8/10/2019 BSS System Description(V900R008C01_01)
28/81
Power control is an important measure of radio link control. Based on the radio links, power
control is categorized into:
l Uplink power control
The BSS measures the receive level and receive quality of the uplink signals and calculates
the required transmit power of the MS. The BSS decides to increase or reduce the transmit
power of the MS according to the power control algorithm.
l Downlink power control
The MS measures the receive level and receive quality of the downlink signals and reports
the measurement reports to the BSS. Based on the measurement reports, the BSS decides
to increase or reduce the transmit power of the BTS according to the power control
algorithm.
Figure 2-5shows the basic principles of power control.
Figure 2-5Basic principles of power control
Receivelevel
Receive
quality
Uplink/downlink
signal quality
threshold
Uplink/downlink
signal quality
lower threshold
Uplink/downlink
signal strength
upper threshold
Uplink/downlink
signal strength
upper threshold
0
7
0 63
MAX(AdjStep_Lev,
AdjStep_Qul)
AdjStep_QulNo Action
AdjStep_LevNo Action
MAX(AdjStep_Lev,
AdjStep_Qul)
AdjStep_Lev
AdjStep_Qul
AdjStep_Lev
l If the receive level or signal quality is greater than the expected value, the transmit power
should be reduced to an appropriate value.
l If the receive level or signal quality is smaller than the expected value, the transmit power
should be increased to an appropriate value.
The performance of the power control algorithm has a great effect on system performance.
Huawei uses Huawei II power control algorithm and Huawei III power control algorithm toimprove the accuracy and effectiveness of the power control.
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-10 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
29/81
l Huawei II power control algorithm
Figure 2-6shows the power control decision procedure of Huawei II power control
algorithm.
Figure 2-6Power control decision procedure of Huawei II power control algorithm
Calculate power adjustmentstep based on both receive
level and receive quality
Start
Calculate power adjustment
step based on receive
quality
End
Perform power control
Compensate MRs
(Compensate level)
MR prediction filtering
Calculate power adjustment
step based on receive level
Huawei II power control algorithm has the following characteristics:
Measurement report compensation
Prediction filtering
Dual-threshold power control algorithm
Variable step power control
Adaptive power control
Bad quality signal strength upper threshold adjustment and detachment of uplink and
downlink power control
l Huawei III Power Control Algorithm
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-11
-
8/10/2019 BSS System Description(V900R008C01_01)
30/81
-
8/10/2019 BSS System Description(V900R008C01_01)
31/81
l Blocking or unblocking terrestrial group circuits in case of equipment failure or through
configurations on the BSC6000 Local Maintenance Terminal.
l Retransmitting circuit management messages (circuit block/unlock/reset) if no
acknowledge is received from the MSC before expiration.
l Supporting the uninstalled circuit function.
l Under the following conditions, the uninstalled circuit function enables the BSC to send
an uninstalled circuit message to the MSC if the specified circuit does not exist:
Circuit block, circuit unblock, or circuit reset
Channel assignment
Incoming BSC handover
BSC reset
NOTE
If IP transmission is used on the A interface, the circuit management function is not implemented by the
BSS.
2.1.10 TRX Management
This describes the TRX management procedure. TRX management refers to TRX status
management.
TRX management consists of the following procedures:
l SACCH filling information modification procedure
The BSC informs the BTS of the new system information transmitted on all DL SACCHs.
The BTS then informs the MS of the system information update.
l Radio resource indication procedure
The BTS informs the BSC of the interference level on the idle dedicated channels of each
TRX. Thus, the BSC is completely informed of the interference level of the current idle
channels to facilitate subsequent channel assignment.
l Flow control procedure
The frame unit controller (FUC) informs the BSC of the overload of a TRX. The possible
causes of overload are CCCH overload, AGCH overload, and processor overload.
l Error reporting procedure
The BTS reports to the BSC the detected DL message errors that cannot be reported by
other procedures.
2.1.11 Media Access Control
This describes Media Access Control (MAC).
The BSC supports the MAC on the Abis interface. MAC defines the process in which multiple
MSs share the transmission media. MAC provides data transmission services to the upper Radio
Link Control through logical channels. It maps the logical channels onto the transport channels.
MAC performs the following functions:
l Multiplexes the uplink and downlink of the MS on Packet Data Channel (PDCH).
l
Schedules the Uplink State Flag (USF) for PDCH to control the transmission of uplinksignaling of the MS.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-13
-
8/10/2019 BSS System Description(V900R008C01_01)
32/81
l Based on the priority of each downlink Temporary Block Flow (TBF), sends the downlink
data block and control block in polling period.
2.1.12 Radio Link Control
This describes Radio Link Control (RLC).
The BSC supports the RLC on the Abis interface. TLC ensures the reliability of the data
transmitted on the Um interface. The involved operations of the RLC include selecting the coding
scheme, processing data retransmission, and segmenting and reassembling the data.
RLC performs the following functions:
l Segmentation and reassembling of RLC data blocks
l TBF establishment and release procedures of RLC data blocks.
2.2 Connection ManagementThis describes the connection management of the BSS. Connection management is a function
for the control, assignment, and management of the services provided by the network. The
services are short message services (SMSs), teleservices, and location-based services.
2.2.1 Voice Calls
This describes the voice call function. The voice calls supported by the BSS consist of MS-
originated calls, MS-terminated calls, emergency calls, and call re-establishment.
2.2.2 Short Message Services
This describes the short message services (SMSs) function. SMSs consist of the point-to-pointSMS and cell broadcast SMS.
2.2.3 Voice Coding/Decoding and Transcoding
This describes the voice coding/decoding and transcoding functions. The transcoding and rate
adaptation is a function through which voice coding and decoding algorithms are used to convert
the 16 kbit/s or 8 kbit/s signals on the Abis interface to 64 kbit/s signals on the A interface. The
reverse procedure is also supported.
2.2.4 Packet Data Transfer
The BSC supports the functions of Relay (RL) layer.
2.2.1 Voice CallsThis describes the voice call function. The voice calls supported by the BSS consist of MS-
originated calls, MS-terminated calls, emergency calls, and call re-establishment.
The BSS uses resource management algorithms and service control procedures to establish an
RR connection. This provides a transmission channel for exchanging call control signaling
between the MS and the core network.
The BSS supports the following voice call procedures:
l MS-originated call establishment procedure
l MS-terminated call establishment procedure
l Emergency call establishment procedure
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-14 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
33/81
l MS-originated call release procedure
l Network-originated call release procedure
2.2.2 Short Message Services
This describes the short message services (SMSs) function. SMSs consist of the point-to-point
SMS and cell broadcast SMS.
Point-to-Point Short Message Service
The point-to-point SMS is a type of basic services provided by the GSM network. The MS sends
or receives a message of limited length, which is displayed on the screen of the MS.
The short message center (SMC) stores and forwards short messages. SMC is completely
separated from the GSM system in terms of functions. The SMC can provide services for the
GSM and PSTN subscribers who can receive short messages.
The MS can send or receive point-to-point messages when it is in idle mode or when it is making
a call.
Cell Broadcast Short Message Service
The cell broadcast SMS-CB is a special service provided by the GSM network. The network
can send short messages on the CBCH to a specified network area in unacknowledged mode.
All the MSs in the specified area can receive and display the messages.
If the cell broadcast SMS is enabled, a message can be broadcast repeatedly. Thus, even the MSs
that just enter the broadcast area can receive the message and the MSs that have received the
message earlier do not receive it again. Mobile network operators can use cell broadcast SMS
to provide special services for their subscribers. Compared with the point-to-point SMS, the cell
broadcast SMS is an effective and economical measure to send messages to a large number of
subscribers in a specified area.
2.2.3 Voice Coding/Decoding and Transcoding
This describes the voice coding/decoding and transcoding functions. The transcoding and rate
adaptation is a function through which voice coding and decoding algorithms are used to convert
the 16 kbit/s or 8 kbit/s signals on the Abis interface to 64 kbit/s signals on the A interface. The
reverse procedure is also supported.
The voice coding and decoding algorithms supported by the BSC consist of full rate, half rate,
enhance full rate, and adaptive multirate (AMR).
NOTE
If IP transmission is used on the A interface, the voice coding/decoding and transcoding functions are not
implemented by the BSS.
2.2.4 Packet Data Transfer
The BSC supports the functions of Relay (RL) layer.
The RL layer adapts the data on the Um interface and Gb interface. It reassembles the uplink
data on the Um interface into Packet Data Units (PDUs) and chooses the appropriate link for
transmission. In addition, the RL layer segments the Gb PDUs into downlink data on the Uminterface and chooses the appropriate PDCH for transmission.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 2 BSS Functions
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
2-15
-
8/10/2019 BSS System Description(V900R008C01_01)
34/81
2.3 BTS Management
This describes the BTS management function. BTS management is a function where procedures
and messages related to the BTS are performed. The procedures and messages such as the BTS
software downloading, BTS data configuration, BTS status management, and BTS alarms
management should be performed by the peer-layer entities of the BSC and BTS.
2.4 BSS Operation and Maintenance
This describes the OM functions of the BSS. The BSS provides OM functions, such as,
performance management, BTS OM, BSC OM, clock control setting, BSC alarms, BTS alarms,
BTS commissioning, dynamic data configuration, GUI, and integrated network management
interfaces.
2 BSS Functions
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
2-16 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
35/81
3Introduction to the BSCAbout This Chapter
This introduces the BSC. Physically, the BSC system is composed of the BSC hardware system
and the BSC software system. Logically, it consists of eights subsystems.
The BSC hardware system consists of the GBCR cabinet, GBSR cabinet, LMT, and alarm box.
In addition to the interfaces for the power supply input and clock signal input, the BSC hardware
provides communication interfaces for equipment such as the BTS, external PCU, MSC, SGSN,
and M2000.
The BSC software has a distributed structure. It consists of the board software and OM software.
The board software and the OM software can communicate with each other.
Logically, the BSC system consists of the TDM switching subsystem, GE switching subsystem,
service processing subsystem, service control subsystem, interface processing subsystem, clock
subsystem, power subsystem, and environment monitoring subsystem.
3.1 BSC Physical Structure
This describes the physical structure of the BSC, including the cabinet, cables, LMT computers,
and alarm box.
3.2 BSC Software Structure
The software of the BSC has a distributed architecture. It is classified into the host software,
OMU software, and LMT software.
3.3 BSC Logical Structure
Logically, the BSC system consists of the TDM switching subsystem, GE switching subsystem,
service processing subsystem, service control subsystem, interface processing subsystem, clock
subsystem, power subsystem, and environment monitoring subsystem.
3.4 BSC Technical Specifications
The BSC technical specifications consist of the capacity specifications, engineering
specifications, physical port specifications, reliability specifications, clock precision
specifications, noise and safety compliance, and environment specifications.
3.5 BSC Hardware Configuration
The GBAM and GOMU are the operation and maintenance entities of the BSC. There are two
types of BSC hardware configuration: configuration type A and configuration type B. In
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 3 Introduction to the BSC
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
3-1
-
8/10/2019 BSS System Description(V900R008C01_01)
36/81
configuration type A, the BSC is configured with the GBAM. In configuration type B, the BSC
is configured with the GOMU. One BSC can use only one configuration type.
3.6 OM of the BSC
You can maintain the BSC in different OM modes.
3 Introduction to the BSC
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
3-2 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
37/81
3.1 BSC Physical Structure
This describes the physical structure of the BSC, including the cabinet, cables, LMT computers,
and alarm box.
Figure 3-1shows the physical structure of the BSC.
Figure 3-1Physical structure of the BSC
OM equipment room
LMT
LMT
Alarm box
Serial portcable
Ethernet
cable
Ethernet
cable
GBCR GBSR GBSR
Equipment room
Optical cable to other NEs
Trunk cable to other NEs
PGND cable to the PDF
Ethernet cable to other NEs
Power cable to the PDF
LMT: Local Maintenance Terminal PDF: Power Distribution Frame
Table 3-1lists the components of the BSC.
Table 3-1Components of the BSC
Component Introduction Description
GSM BSC control
processing rack (GBCR)
The GBCR provides
switching and processes
services for the BSC. One
GBCR is configured in a
BSC.
For details, refer to GBCR
(Configuration Type A)and
GBCR (Configuration Type B).
GSM BSC service
processing rack (GBCR)
The GBSR processes
various services for the
BSC. The number of
GBSRs to be configured
depends on the traffic
volume. Zero to three
GBSRs can be
configured.
For details, refer to GBSR
Cabinet.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 3 Introduction to the BSC
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
3-3
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
38/81
Component Introduction Description
BSC Cables BSC cables are classified
into the Ethernet cable,
optical cable, and trunk
cable. The number of
BSC cables to be
configured depends on
actual requirements.
For details, refer to BSC Cables.
BSC LMT The LMT is a computer
that is installed with the
LMT software package
and is connected to the
OM network of the NEs.
It is optional for the BSC.
For details, refer to LMT-Related
Definitions.
Alarm box The alarm box cangenerate audible and
visual alarms. It is
mandatory for the BSC.
User manual delivered with thealarm box
3.2 BSC Software Structure
The software of the BSC has a distributed architecture. It is classified into the host software,
OMU software, and LMT software.
Host Software
The host software runs on various service boards. It consists of the operating system, middleware,
and application software. Figure 3-2shows the structure of the host software.
Figure 3-2Structure of the host software
Operating system
Middleware
Application software
l Operating system
The operating system adopted in the BSC is VxWorks, which is an embedded real-time
operating system.
l Middleware
The Distributed Object-oriented Programmable Realtime Architecture (DOPRA) and
Platform of Advanced Radio Controller (PARC) middleware ensures that the upper-level
application software is independent of the lower-level operating system. The middlewareenables software functions to be transplanted between different platforms.
3 Introduction to the BSC
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
3-4 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
39/81
l Application software
Different boards are configured with different types of application software. The
application software is classified into radio resource processing software, resource control
plane processing software, BTS management software, and configuration management and
maintenance software.
OMU Software
The operation maintenance unit (OMU) software runs on the GBAM server or on the GOMU
to perform the operation and maintenance of the BSC. Figure 3-3shows the structure of the
OMU software.
Figure 3-3Structure of the OMU software
OMU software
Middleware
Operating system
l Operating system
The OMU software runs on the Linux operating system.l Middleware
The DOPRA middleware ensures that the upper-level application software is independent
of the lower-level operating system. Thus, the middleware enables software functions to
be transplanted between different platforms.
l Application software
The application software performs the functions of different logical entities in the GBAM/
GOMU.
LMT Software
The LMT software, which consists of the operating system and application software, runs on
the LMT computer. Figure 3-4shows the structure of the LMT software.
Figure 3-4LMT software structure
Operating system
Application software
l Operating system
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 3 Introduction to the BSC
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
3-5
-
8/10/2019 BSS System Description(V900R008C01_01)
40/81
The LMT runs on the Windows 2000 Professional, Windows XP Professional, or Microsoft
Windows Vista Professional operating system.
l Application software
The application software provides access to operation and maintenance of the BSC. The
application software consists of the BSC6000 Local Maintenance Terminal, BSC6000Online Help, Site Maintenance Terminal System, LMT Service Manager, Local
Maintenance Terminal, Performance Browser tool, and Convert Management System.
NOTE
The BSC6000 Local Maintenance Terminal provides a graphic user interface (GUI) for performing
operation and maintenance. The Local Maintenance Terminal is also called the MML client, which
provides MML commands for the users. Both of them support the maintenance and data configuration
of the BSC and the BTSs connected to the BSC.
3.3 BSC Logical Structure
Logically, the BSC system consists of the TDM switching subsystem, GE switching subsystem,
service processing subsystem, service control subsystem, interface processing subsystem, clock
subsystem, power subsystem, and environment monitoring subsystem.
Figure 3-5shows the logical structure of the BSC.
Figure 3-5Logical structure of the BSC
Service
processing
subsystem
Service
controlsubsystem
Interface
processingsubsystem
Environment
monitoring
subsystem
GBAM/GOMU
LMT/M2000
To BTS
To PCU/SGSN
To MSC/MGW
TDMswitching
subsystem
GE
switching
subsystem
Clocksubsystem
Powersubsystem
The interface processing subsystem of the BSC provides the Pb or Gb interface, depending on
the types of PCU.
l When the built-in PCU is used, the interface processing subsystem provides the Gb interface
to enable the communication between the BSC and the SGSN.
l
When the external PCU is used, the interface processing subsystem provides the Pbinterface to enable the communication between the BSC and the PCU.
3 Introduction to the BSC
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
3-6 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
41/81
The interface processing subsystem of the BSC cannot provide the Gb interface and Pb interface
simultaneously.
The interface processing subsystem supports different transmission modes over the A interface:
l When the IP transmission is used, the A interface enables the communication between the
BSC and the MGW.
l When the TDM transmission is used, the A interface enables the communication between
the BSC and the MSC/MGW.
The interface processing subsystem of the BSC cannot support the two transmission modes
simultaneously.
3.4 BSC Technical Specifications
The BSC technical specifications consist of the capacity specifications, engineering
specifications, physical port specifications, reliability specifications, clock precision
specifications, noise and safety compliance, and environment specifications.
3.5 BSC Hardware Configuration
The GBAM and GOMU are the operation and maintenance entities of the BSC. There are two
types of BSC hardware configuration: configuration type A and configuration type B. In
configuration type A, the BSC is configured with the GBAM. In configuration type B, the BSC
is configured with the GOMU. One BSC can use only one configuration type.
3.6 OM of the BSC
You can maintain the BSC in different OM modes.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 3 Introduction to the BSC
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
3-7
-
8/10/2019 BSS System Description(V900R008C01_01)
42/81
-
8/10/2019 BSS System Description(V900R008C01_01)
43/81
4Introduction to the PCUAbout This Chapter
This introduces the PCU. The PCU provides packet data services. The main functions of the
PCU include packet radio resource management, packet calls control, and packet data
transmission. Huawei BSS supports built-in PCU and external PCU.
4.1 Introduction to the Built-in PCU
This introduces the built-in PCU. The BSC processes the packet services through the
configuration of the corresponding boards.
4.2 Introduction to the External PCU
Huawei BSS supports the external PCU. Physically, the external PCU consists of the hardware
system and the software system. Logically, the external PCU consists of the OM unit and the
radio packet processing unit.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 4 Introduction to the PCU
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
4-1
-
8/10/2019 BSS System Description(V900R008C01_01)
44/81
4.1 Introduction to the Built-in PCU
This introduces the built-in PCU. The BSC processes the packet services through the
configuration of the corresponding boards.
Physical Structure
The functions of the built-in PCU are implemented by the following BSC boards:
l GDPUP: processes the user plane of the packet services. For details on the GDPUP, refer
to Functions of the GDPUP.
l GXPUM: processes the control plane of the packet services. For details on the GXPUM,
refer to Functions of the GXPUM.
l GFGUG: the interface processing board that provides the Gb interface based on IP
transmission. For details on the GFGUG, refer to Functions of the GFGUG.l GEPUG: the interface processing board that provides the Gb interface based on FR
transmission. For details on the GEPUG, refer to Functions of the GEPUG.
The GDPUP and the GFGUG/GEPUG are configured in the GMPS/GEPS subrack.
l For details on the typical configurations of the GMPS in different scenarios, refer to
Configuration of the GMPS (Configuration Type A)and Configuration of the GMPS
(Configuration Type B).
l For details on the typical configurations of the GEPS in different scenarios, refer to
Configuration of the GEPS.
Logical Structure
The BSC processes the packet data services through the service processing subsystem, service
control subsystem, and Gb interface processing unit. Figure 4-1shows the logical structure of
the built-in PCU.
4 Introduction to the PCU
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
4-2 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
45/81
Figure 4-1Logical structure of the built-in PCU
BSC
Built-in PCU
Gb
UNITDATA SIGNAL
Abis
Service
processingsubsystem
Service
controlsubsystem
Gb interface
processing unit
BTS
SGSN
Abis interface
processing unit
l
Service processing subsystemProcesses the PS user plane data. The function implemented by the GDPUP.
l Service control subsystem
Processes the PS signaling plane data. Performs the virtual connection management,
resource management, and network management layer of the network services. The
function is implemented by the GXPUM/GXPUT.
l Gb interface processing unit
Performs the data transmission and routing. The function is implemented by the GFGUG/
GEPUG.
Physical Ports
The GFGUG/GEPUG provides the Gb interface to the SGSN.
l Each GFGUG supports eight FE ports and two GE ports. For details on physical ports, refer
to Ports on the GFGUA/GFGUB/GFGUG Panel.
l Each GEPUG supports 32 E1/T1 ports. For details on physical ports, refer to Ports on the
GEHUB/GEPUG Panel.
Operation and Maintenance
The operation and maintenance of Huawei built-in PCU is implemented by the OM subsystemof the BSC.
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 4 Introduction to the PCU
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
4-3
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?- -
8/10/2019 BSS System Description(V900R008C01_01)
46/81
4.2 Introduction to the External PCU
Huawei BSS supports the external PCU. Physically, the external PCU consists of the hardware
system and the software system. Logically, the external PCU consists of the OM unit and the
radio packet processing unit.
4.2.1 PCU Physical Structure
This describes the physical structure of the PCU. Physically, the PCU consists of the power
distribution box, LAN switch subrack, LAN switch cable trough, filler panel, PCU processing
subrack, and air defense subrack.
4.2.2 PCU Software Structure
This describes the software structure of the PCU. The PCU software consists of the PCU
operating system (OS), POMU software, RPPU software, and L2PU software.
4.2.3 PCU Logical StructureThis describes the logical structure of the PCU. The PCU has a simple logical architecture. It
consists of the packet operation maintenance unit (POMU) and radio packet process unit
(RPPU).
4.2.4 PCU Physical Ports
This describes the PCU physical ports. The PCU physical ports consist of the transmission ports,
commissioning serial ports, and internal communication ports.
4.2.5 PCU Technical Specifications
This describes the technical specifications of the PCU. The technical specifications of the PCU
involves physical protection, data backup and security, working environment, ElectroMagnetic
Compatibility (EMC), noise, storage, transportation, power supply, power consumption, andcapacity.
4.2.6 PCU Operation and Maintenance
This describes the operation and maintenance (OM) of the PCU. The OM module of the PCU
provides operation and maintenance functions, such as OM management, data configuration
management, fault management, performance measurement management, and security
management. You can use these functions to remotely monitor the PCU running status, maintain
PCU devices, locate faults, and evaluate the network performance.
4.2.1 PCU Physical Structure
This describes the physical structure of the PCU. Physically, the PCU consists of the power
distribution box, LAN switch subrack, LAN switch cable trough, filler panel, PCU processing
subrack, and air defense subrack.
Figure 4-2shows the physical structure of the PCU.
4 Introduction to the PCU
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
4-4 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
47/81
Figure 4-2Physical structure of the PCU
Powerdistribution box (2 U)
LAN switch
cable trough (1 U)
PCU processing
subrack (9 U)
LAN switch (1 U)
Filler panel (3 U)
Air defencesubrack (2 U)
Filler panel (3 U)
Filler panel (2 U)
PCU processing
subrack (9 U)
PCU processing
subrack (9 U)
Air defencesubrack (2 U)
NOTE
1 U = 44.45 mm
A PCU cabinet can hold up to three processing subracks. The three subracks are independent
from each other and are interconnected through the LAN switch and the OMC for centralized
monitoring.
The PCU processing subrack can be configured with the POMU, HSC, RPPU, L2PU sub-board,
E1TMb, BSU, and UPWRb. Figure 4-3and Figure 4-4show fully configured PCU processing
subracks.
Figure 4-3Fully configured PCU processing subrack (front subrack)
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
P
O
M
U
P
O
M
U
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
R
P
P
U
P
W
R
P
W
R
b b
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
U U
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 4 Introduction to the PCU
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
4-5
-
8/10/2019 BSS System Description(V900R008C01_01)
48/81
Figure 4-4Fully configured PCU processing subrack (rear subrack)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
B
SU
H
SC
B
SU
H
SC
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
1T
M
b
E
PW
R
PW
R
b b
U U
4.2.2 PCU Software Structure
This describes the software structure of the PCU. The PCU software consists of the PCU
operating system (OS), POMU software, RPPU software, and L2PU software.
Figure 4-5shows the software structure of the PCU.
4 Introduction to the PCU
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
4-6 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
49/81
Figure 4-5Software structure of the PCU
Performance
measurement
PCU software
RPPU
software
L2PU
software
POMU
software
Database
management
Software
management
Fault
management
status
monitoring and
management
OS
core module
I/O
processing
System
initialization
State
monitoring &
management
Fault
management
Software
management
Database
management
Performance
measurement
RLC/MAC
protocol
processing
Gb interface
processing
Pb interface
processing
G-Abis
interface
processing
link layer
protocol
processing
PCU operating
system
PCU Operating System
The PCU OS consists of the OS core module, input and output processing module, and system
initialization module.
POMU Software
The POMU software consists of the state monitoring and management module, fault
management module, software management module, database management module, and
performance measurement module.
RPPU Software
Each module of the POMU software has a corresponding module in the RPPU software. The
corresponding two modules communicate with each other to perform the OM function.
A database update procedure is initiated by the database management module in the POMUsoftware. If the procedure affects the database view stored in the RPPU, the procedure can be
HUAWEI BSC6000 Base Station Subsystem
BSS System Description 4 Introduction to the PCU
Issue 01 (2008-06-10) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
4-7
-
8/10/2019 BSS System Description(V900R008C01_01)
50/81
implemented only when the corresponding database management module in the RPPU software
is activated.
In addition to the previously mentioned modules, the RPPU software includes the RLC/MAC
protocol processing module, Gb interface processing module, G-Abis interface processing
module, and Pb interface processing module.
L2PU Software
The L2PU software performs link layer protocol processing. It consists of the LAPD processing
module, frame relay protocol processing module, and TRAU protocol processing module.
4.2.3 PCU Logical Structure
This describes the logical structure of the PCU. The PCU has a simple logical architecture. It
consists of the packet operation maintenance unit (POMU) and radio packet process unit
(RPPU).
Figure 4-6shows the logical structure of the PCU.
Figure 4-6Logical structure of the PCU
Signaling and data bus
RPPU RPPURPPU
BSC SGSN
RPPU
RPPUPOMU
N+1
1+1 LAN
Harddisk
RPPURPPU
POMU Module
The POMU module provides interfaces for users, processes the interface protocol between the
PCU and the OMC, and performs OM.
RPPU Module
The RPPU module implements the base station subsystem (BSS) part of the RLC/MAC protocol
and of the Gb interface protocols and performs Pb interface processing and G-Abis interfaceprocessing.
4 Introduction to the PCU
HUAWEI BSC6000 Base Station Subsystem
BSS System Description
4-8 Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd
Issue 01 (2008-06-10)
-
8/10/2019 BSS System Description(V900R008C01_01)
51/81
4.2.4 PCU Physical Ports
This describes the PCU physical ports. The PCU physical ports consist of the transmission ports,
commissioning serial ports, and internal communication ports.
Table 4-1lists the PCU physical ports.
Table 4-1PCU physical ports
Connector Board Description
Ethernet port (10/100
BaseT)
POMU
RPPU
E1TMb
BSU
The Ethernet ports on the
POMU and on the RPPU are
invalid.
You can use Ethernet port 1 on
the BSU instead of that on the
POMU and Ethernet port 1 on
the E1TMb instead of that on
the RPPU. The Ethernet port
LED on the POMU indicates
the status of Ethernet port 1 on
the BSU. The Ethernet port
LED on the RPPU indicates
top related