bsc6900v900r012 uo system structure-20101218-b-v1.0.ppt

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The BSC6900 is an important network element (NE) of Huawei Single RAN solution. It
adopts the industry-leading multiple radio access technologies (RATs), IP transmission mode, and modular design. In addition, it is integrated with the functions of the UMTS RNC and GSM BSC, thus efficiently maintaining the trend of multi-RAT convergence in the mobile network.
HUAWEI TECHNOLOGIES CO., LTD.
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RNCs (Radio Network Controller) and NodeBs compose the UTRAN (UMTS Terrestrial Radio Access Network)
RNC performs the following main functions: system information broadcasting, handover, cell resource allocation, radio resource management and so on,
Huawei RNC is named as BSC6810/BSC6900 UMTS
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RNCsRadio Network Controllerand NodeBs compose the UTRAN (UMTS Terrestrial Radio Access Network)
RNC performs the following main functions: system information broadcasting, handover, cell resource allocation, radio resource management and so on,
Huawei RNC is named as BSC6810 and BSC6900 UMTS
Upon completion of this course, you will be able to:
Master the system structure of BSC6900
Master the functions of the boards in BSC6900
Master the signal flows in BSC6900
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Upon completion of this course, you will be able to:
Master the system structure ,the functions of the boards and the signal flows in BSC6900.
BSC6900 UMTS Technical Description(V900R012C00_01)
CN
OMUa
SPUa/SPUb
DPUb/DPUe
RINT
AOUa/AOUc
RNC 2-port ATM over channelized Optical STM-1/OC-3 Interface Unit REV:a
UOIa/UOIc
RNC 4-port ATM/IP over Unchannelized Optical STM-1/OC-3c Interface unit REV:a
PEUa
FG2a/FG2c
RNC packet over electronic 8-port FE or 2-port GE ethernet Interface unit REV:a
GOUa/GOUc
RNC 2-port packet over Optical GE ethernet Interface Unit REV:a
POUa/POUc
RNC 2-port packet over channelized Optical STM-1/OC-3 Interface Unit REV:a
Chapter 4 BSC6900 System Hardware Configuration
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RNC
RNC
NodeB
NodeB
NodeB
PS
CBC
UE
UTRAN
CN
Uu
Iu
Iu-CS
Iu-PS
Iu-BC
Iur
Iub
Iub
Iub
SGSN: Serving GPRS Support Node
UTRAN: UMTS Terrestrial Radio Access Network
NodeBs through the lub interface
The MSC (or the MSC server and MGW in R4/R5/R6/R7), which processes Circuit Switched (CS) services through the Iu-CS interface
The SGSN, which processes Packet Switched (PS) services through the Iu-PS interface
The CBC, which processes broadcast services through the Iu-BC interface
Another RNC through the Iur interface
It supports up to 12000Mbit/s PS service processing (UL+DL)
It supports up to 3060 NodeBs and 5,100 Cells
It provides Single-Subrack Solution: supports 13,400 equivalent voice channels and 5000Mbit/s PS data capacity;
13400
80,400
26800
40200
53600
67000
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2.3 BSC6900 Cables
BSC6900 Cabinets
The RNC uses the Huawei N68E-22 cabinet and the Huawei N68E-21-N cabinet.
The two models of cabinets have the same appearance.
N68E-22 is divided into a single-door cabinet or a double-door cabinet.
N68E-22 Cabinet
Height of the available space
46U(1U=44.45mm=1.75inches)
Power consumption
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The N68E-21-N cabinet is a double-door cabinet.
N68-21 Cabinet
Height of the available space
44U
Weight
Power consumption
600mm
2133mm
800mm
BSC6900 subrack use the 12 U shielding subrack of Huawei.
There are 28 slots in the subrack, the subrack backplane is positioned in the middle, and front and rear boards are installed on both sides of the backplane
Subrack type: MPS and EPS
12U
(5) Board
(8) Port for monitoring signal cable
(9) DIP switch
1U=44.45mm=1.75inch.
Both the MPS subrack and the EPS subrack use the 12 U shielding subrack of Huawei. The main components of the subrack are the fan box, boards, and front cable trough.
The heat dissipation of the cabinet mainly depends on the fan boxes. Each subrack is configured with one fan box. The fan box is registered, that is, the communication is established between the fan box and the SCUa board which is located in the same subrack with the fan box.
On each plane from leftmost to rightmost, every two neighboring slots have an active/standby relationship.
For example, slots 0 and 1 are active/standby slots. The same is true for slots 2 and 3. Boards that work in active/standby mode must be installed in active/standby slots.
There are 28 slots in the MPS subrack. Except for slots 20–23, each slot holds one board. For slots 20–23, two slots hold one OMUa board.
The DIP switch on the RNC subrack has eight bits The DIP switch are used to set the subrack number.
The DIP switch on the RNC subrack has eight bits.
If the bit is set to ON, it indicates 0. If the bit is set to OFF, it indicates 1.
Bit
Description
1-5
Bits 1 to 5 are used for setting the subrack number. Bit 1 is the least significant bit. If the bit is set to ON, it indicates 0. If the bit is set to OFF, it indicates 1.
6
8 (the most significant bit)
Reserved
DIP Switch Position of Each Subrack
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The bit 6 should cooperate with bit 1 to bit 5. This function is to ensure that there are an odd number of ON switches among the total eight switches at the same time.
MPR
EPS-1
MPS-0
EPS-2
MPR including
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BSC6900 system can hold up to 1 EPR
EPR including
EPR
EPS-4
EPS-5
BSC6900 can hold up to 1 MPS
WCDMA RNC operation and maintenance unit (OMUa)
WCDMA RNC signaling processing unit (SPUa/SPUb)
WCDMA RNC data processing unit (DPUb/DPUe)
WCDMA RNC Switch and control unit (SCUa)
WCDMA RNC General Clock Unit (GCUa/GCGa)
WCDMA RNC Interface board (WINT)
BSC6900 can hold up to 5 EPSs
WCDMA RNC Interface Board (WINT)
WCDMA RNC signaling processing unit (SPUa/SPUb)
WCDMA RNC data processing unit (DPUb/DPUe)
WCDMA RNC Switch and control unit (SCUa)
2.3 BSC6900 Cables
Logically, the RNC consists of the following subsystems: switching subsystem,
service processing subsystem, transport subsystem, clock synchronization
subsystem, Operation and Maintenance subsystem, power subsystem,
and environment monitoring subsystem.
Switching Subsystem
The switching subsystem performs switching of traffic data, signaling, and OM signals.
The switching subsystem consists of “MAC switching” logical modules.
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Provides intra-subrack Medium Access Control (MAC) switching
Provides inter-subrack MAC switching and TDM switching
Distributes clock signals and RFN signals to the service processing boards
Switching Subsystem hardware:
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Position of the SCUa Board in MPS
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Position of the SCUa Board in EPS
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SCUa Board Introduction
Main control board for configuration and maintenance of the local subrack
Support 60G Switching capacity
Support synchronous clock and time synchronous information to other boards of the local subrack
The SCUa boards work in full-interconnection and dual-plane mode and enable connection of subracks for the RNC
Port Name
10M/100M/1000M Ethernet ports. The ports are used for the inter-subrack connection.
RJ45
COM

Port for inputting reference clock source. This port is used to receive the 8 kHz and the 1PPS timing signals from the GCUa/GCGa board.
RJ45
TESTOUT

Port for testing timing signal output. This port is used to test the timing signal output
SMB male
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Instead of ATM switching, SCUa provide 60Gbps switch capacity, total 120Gbps switch capacity (two SCUa in MPS worked in load sharing)
4Gbps between subracks
To be specific, the SCUa board performs the following functions:
Providing MAC switching, enabling the convergence of ATM and IP networks.
Supporting the port trunking function.
Providing a total switching capacity of 60 Gbit/s.
Distributing timing signals and RFN signals for the RNC.
Enabling inter-subrack connections.
Providing configuration and maintenance of a subrack or of the whole RNC.
Monitoring the power supply, fans, and environment of the cabinet.
Service Processing Subsystem
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Functions of Service Processing Subsystem
The RNC service processing subsystem implements most RNC functions defined in the 3GPP protocols and processes services of the RNC.
User data transfer
System admission control
Data integrity protection
Cell broadcast service control
Radio access management
CS service processing
PS service processing
Components of Service Processing Subsystem
The service processing subsystem consists of the SPUa, SPUb, DPUb, and DPUe boards. The SPUa and SPUb boards process signaling. The DPUb and DPUe boards process services.
Service processing subsystems can be increased as required, according to the linear superposition principle. Thus, the service processing capability of the BSC6900 is improved.
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Position of Service Processing Subsystem Board in MPS
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SPU and DPU should put on the relative slot, otherwise the cell can not available.
Position of Service Processing Subsystem Board in EPS
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SPUa/SPUb Board Introduction
SPUa/SPUb Loaded with different software, the SPU board is functionally divided into the main control SPU board and non-main control SPU board.
The main control SPU board is used to manage the user plane resources, control plane resources, and transmission resources in the system and process the services on the control plane.
The non-main control SPU board is used to process the services on the control plane.
SPUa board has four logical subsystems;
SPUb board has eight logical subsystems.
Processing capability of the main control SPUa board
Supporting 100 NodeBs, 300 cells, and 80,000 BHCAs
Processing capability of the non-main control SPUa board
Supporting 100 NodeBs, 300 cells, and 80,000 Busy Hour Call Attempts (BHCAs)
Processing capability of the main control SPUb board
Processing capability of the non-main control SPUb board
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Subsystem 0 of the controlling SPUa board is the Main Processing Unit (MPU). It is used to manage the user panel resources, signaling panel resources, and the DSP status of this subrack. The functions are detailed as follows:
Managing the user panel resources of this subrack, such as managing and allocating the L2 resources of the subrack. Managing the load sharing of the user panels between subracks.
Managing and allocating the loading of the control panel within a subrack; managing and allocating the loading information sharing of the control panel between subracks.
Providing functions such as the logical controlling function of the RNC, the IMSI-RNTI maintenance and equiry, and the IMSI-CNid maintenance and equiry.
Setting up the RRC connection for forwarding the RRC request message, so as to fulfill the inter-subrack sharing of user plane resources and intra-subrack and inter-subrack sharing of control plane resources.
Subsystems 1, 2, and 3 of the controlling SPUa board refer to the subsystems of the Signaling Processing Unit (SPU), which is used to handle the signaling processing, the functions are detailed as follows:
Processing high-layer signaling of the Uu/Iu/Iur/Iub interfaces, such as the RRC signaling of the Uu interface, the RANAP signaling of the Iu interface, the RNSAP signaling of the Iur interface, and the NBAP signaling of the Iub interface
Processing transport layer signaling
Allocating and managing various resources, such as PVC, AAL2, AAL2 PATH, GTP-U, PDCP, IUUP, RLC, MAC-d, MDC, and FP, which are necessary for service setup, and establishing signaling and service connections
Processing RNC Frame Number (RFN) signals
Selects and distributes data
Performs the functions of the GTP-U, IUUP, PDCP, RLC, MAC, and FP protocols
Performs encryption, decryption, and paging
Processes internal communication protocols between the SPUa board and the DPUb board
Processes the Multimedia Broadcast and Multicast Service (MBMS) at the RLC layer and the MAC layer
Processing capability of DPUb
Supporting 1,800 Erlang for CS speech service
Supporting 900 Erlang for CS data service
Supporting 150 cells
Processing capability of DPUe
Supporting the UL+DL data stream at 335 Mbit/s;Supporting the UL+DL data stream at 500 Mbit/s if the capacity license is configured
Supporting 3,350 Erlang for CS speech service
Supporting 1,675 Erlang for CS data service
Supporting 300 cells
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The DPUb board processes and distributes service data on the user plane.
To be specific, the DPUb board performs the following functions:
Multiplexing and demultiplexing NOTE:
In the uplink, the DPUb board receives data from the NodeBs, demultiplexes the data, and then sends it to the corresponding processing units. In the downlink, the DPUb board receives signaling, speech data, and packet data, multiplexes it, and then sends it to the NodeBs.
Processing frame protocols
Selecting and distributing data
Performing Segmentation and Reassembly (SAR) of the Radio Link Control (RLC)
Processing internal communication protocols between the SPUa board and the DPUb board
Performing encryption, decryption, and paging
Building Integrated Timing Supply System (BITS) clock
Global Positioning System (GPS) clock
External 8 kHz clock
The external clocks of the BSC6900 are of two types:
BITS Clock
The BITS clock signals are of three types: 2 MHz, 2 Mbit/s, and 1.5 Mbit/s. The 2 MHz and 2 Mbit/s clock signals are E1 clock signals, and the 1.5 Mbit/s clock signals are T1 clock signals.
The BITS clock has two input modes: BITS0 and BITS1. BITS0 and BITS1 correspond to the CLKIN0 and CLKIN1 ports on the GCUa/GCGa board respectively. The BSC6900 obtains the BITS clock signals through the CLKIN0 or CLKIN1 port on the GCUa/GCGa board.
External 8 kHz Clock Through the COM1 port on the GCUa/GCGa board, the BSC6900 obtains 8 kHz standard clock signals from an external device.
LINE Clock
The LINE clock is an 8 kHz clock that is transmitted from an interface board in the MPS to the GCUa/GCGa board through the backplane channel. The LINE clock has two input modes: LINE0 and LINE1.
GPS Clock
The GPS clock provides 1 Pulse Per Second (PPS) clock signals. The BSC6900 obtains the GPS clock signals from the GPS system. The GCGa board is configured with a GPS card, and the BSC6900 receives the GPS signals at the ANT port on the GCGa board.
The external clocks of the BSC6900 are of two types:
BITS Clock
The BITS clock signals are of three types: 2 MHz, 2 Mbit/s, and 1.5 Mbit/s. The 2 MHz and 2 Mbit/s clock signals are E1 clock signals, and the 1.5 Mbit/s clock signals are T1 clock signals.
The BITS clock has two input modes: BITS0 and BITS1. BITS0 and BITS1 correspond to the CLKIN0 and CLKIN1 ports on the GCUa/GCGa board respectively. The BSC6900 obtains the BITS clock signals through the CLKIN0 or CLKIN1 port on the GCUa/GCGa board.
External 8 kHz Clock Through the COM1 port on the GCUa/GCGa board, the BSC6900 obtains 8 kHz standard clock signals from an external device.
LINE Clock
The LINE clock is an 8 kHz clock that is transmitted from an interface board in the MPS to the GCUa/GCGa board through the backplane channel. The LINE clock has two input modes: LINE0 and LINE1.
GPS Clock
The GPS clock provides 1 Pulse Per Second (PPS) clock signals. The BSC6900 obtains the GPS clock signals from the GPS system. The GCGa board is configured with a GPS card, and the BSC6900 receives the GPS signals at the ANT port on the GCGa board.
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SMA female
CLKOUT0~9
Ports for outputting synchronization timing signals. The ten ports are used to output 8 kHz timing signals and 1PPS timing signals
RJ45
COM0
Reserved
RJ45
COM1
RJ45
TESTOUT
Port for testing timing signal output. This port is used to output the internal timing signals of the board
SMB male
TESTIN
Port for testing timing signal input. This port is used to input 2 MHz signals.
SMB male
Port for inputting BITS timing signals and line timing signals.
SMB male
Port for inputting BITS timing signals and line timing signals.
SMB male
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When the RNC is configured with active/standby GCUa/GCGa boards and active/standby SCUa boards, the connections of clock cables between the boards follow certain rules. Figure 2 shows the connections between the GCUa/GCGa boards in the MPS subrack and the SCUa boards in an EPS subrack.
As shown in Figure 2, the active/standby GCUa/GCGa boards in the MPS subrack are connected to the active/standby SCUa boards in the EPS subrack through the Y-shaped clock cables. This connection mode ensures proper working of the timing signals for the RNC system if a single-point failure occurs to the GCUa/GCGa board, Y-shaped clock cable, or SCUa board. In addition, the Y-shaped cable protects the proper working of the SCUa boards from switchover of the GCUa/GCGa boards. NOTE:
In the MPS subrack, the GCUa/GCGa boards send timing signals to the SCUa boards in the same subrack through the backplane channels. Therefore, the Y-shaped cables are not required.
RINT

AEUa
Iub
AOUa
Iub
AOUc
IuIurIub
POUa
2 channels over channelized optical STM-1/OC-3 ports based on IP protocol
Iub
POUc
4 channels over channelized optical STM-1/OC-3 ports based on IP protocol
IurIub
IuIu-BCIurIub
IuIurIub
Iub
FG2a
eight channels over FE ports or two channels over GE ports
IuIu-BCIurIub
FG2c
12 channels over FE ports or three channels over GE ports
IuIurIub
IuIu-BCIurIub
IuIurIub
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The RNC transport subsystem provides transmission ports and resources on the Iub, Iur, and Iu interfaces for the RNC, processes transport network layer messages, and enables interaction between RNC internal data and external data.
Providing Diverse Transmission Ports
The RNC transport subsystem provides the RNC with diverse transport solutions, supports ATM and IP transport at the same time, and meets networking requirements of different transport networks.
The transport subsystem provides the following types of transmission port:
E1/T1 port
The RNC transport subsystem processes transport network layer messages.
In ATM transport mode, the transport subsystem terminates AAL2/AAL5 messages.
In IP transport mode, the transport subsystem terminates user plane UDP/IP messages and forwards control plane IP messages.
NOTE:
The RNC transport subsystem also processes GTP-U data on the Iu-PS interface.
Through the transport subsystem, the RNC shields the differences between transport network layer messages within the RNC.
In the uplink, the transport subsystem terminates transport network layer messages at the interface boards. Then, according to the configuration transfer table, the subsystem transfers user plane, control plane, and management plane datagrams to the DPUb and SPUa boards in the RNC for processing. The downlink flow is the converse of the uplink flow.
Providing Diverse Transmission Ports
The RNC transport subsystem provides the RNC with diverse transport solutions, supports ATM and IP transport at the same time, and meets networking requirements of different transport networks.
The transport subsystem provides the following types of transmission port:
E1/T1 port
The RNC transport subsystem processes transport network layer messages.
In ATM transport mode, the transport subsystem terminates AAL2/AAL5 messages.
In IP transport mode, the transport subsystem terminates user plane UDP/IP messages and forwards control plane IP messages.
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Provides 32 IMA groups or 32 UNI links
Supports the Iub interfaces
Supports the timeslot cross-connection function
Receives clock signals from the Iu interface and transmits clock signals to the GCUa/GCGa board
AEUa
The preceding specifications are the maximum capability regarding the corresponding service.
The data service in the CS domain indicates the 64 kbit/s video phone service.
Item
Specification
Iub
2,800 Erlang
680 Erlang
90 Mbit/s
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Functions:
Provides two channels over channelized optical STM-1/OC-3 ports based on ATM
Provides the AAL2 switching function
Provides the IMA and the UNI functions
AOUa
9,000 Erlang
3,000 Erlang
390 Mbit/s
Supports the IMA function
AOUc
18,000 Erlang
5,500 Erlang
600 Mbit/s
18,000 Erlang
5,500 Erlang
600 Mbit/s
18,000 Erlang
5,500 Erlang
700 Mbit/s
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Functions:
Provides two channels over channelized optical STM-1/OC-3 ports based on IP protocol
Supports IP over E1/T1 over SDH/SONET
Provides MLPPP groups. In E1 transmission mode, the POUa board provides 42 MLPPP groups; in T1 transmission mode, the POUa board provides 64 MLPPP groups.
Supports 126 E1s or 168 T1s
Provides the Automatic Protection Switching (APS) function between the active and standby OIUa boards
POUa
6,000 Erlang
1,500 Erlang
240 Mbit/s
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Functions
Provides four channels over channelized optical STM-1/OC-3 ports based on IP protocol
Supports the PPP function
Extracts line clock signals
Provides the Automatic Protection Switching (APS) function between the active and standby POUc boards
Supports the Iur, and Iub interfaces
POUc
18,000 Erlang
6,000 Erlang
800 Mbit/s
18,000 Erlang
6,000 Erlang
800 Mbit/s
Supports ATM/IP over SDH/SONET
Provides the Automatic Protection Switching (APS) function between the active and standby OIUa boards
Supports the Iu, Iu-BC, Iur, and Iub interfaces
Supports the extraction of line clock signals
UOIa
9,000 Erlang
3,000 Erlang
450 Mbit/s
9,000 Erlang
3,000 Erlang
450 Mbit/s
9,000 Erlang
3,000 Erlang
535 Mbit/s
6,000 Erlang
1,500 Erlang
240 Mbit/s
6,000 Erlang
1,500 Erlang
240 Mbit/s
6,000 Erlang
1,500 Erlang
500 Mbit/s
Supports ATM over SDH/SONET
Provides the Automatic Protection Switching (APS) function between the active and standby POUc boards
Supports the Iu, Iur, and Iub interfaces
UOIc
18,000 Erlang
9,000 Erlang
1,200 Mbit/s
18,000 Erlang
9,000 Erlang
1,200 Mbit/s
18,000 Erlang
9,000 Erlang
1,800 Mbit/s
Provides 32 channels of IP over PPP/MLPPP over E1/T1
Provides 128 PPP links or 32 MLPPP groups, each MLPPP group containing 8 MLPPP links
Provides the Tributary Protect Switch (TPS) function between the active and standby PEUa boards
Transmits, receives, encodes, and decodes 32 channels of E1s/T1s. The E1 transmission rate is 2.048 Mbit/s; the T1 transmission rate is 1.544 Mbit/s.
2,800 Erlang
850 Erlang
120 Mbit/s
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Functions:
Provides eight channels over FE ports or two channels over GE ports
Provides the routing-based backup and load sharing
Provides the link aggregation function at the MAC layer
FG2a
6,000 Erlang
6,000 Erlang
840 Mbit/s
6,000 Erlang
6,000 Erlang
840 Mbit/s
6,000 Erlang
3,000 Erlang
840 Mbit/s
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Functions:
Provides 12 channels over FE ports or three channels over GE ports
Provides the link aggregation function at the MAC layer
Supports the transmission of data over all its Ethernet ports on the basis of the synchronized clock signals
FG2c
18,000 Erlang
18,000 Erlang
2,600 Mbit/s
6,000 Erlang
6,000 Erlang
2,600Mbit/s
Iu-CS
18,000 Erlang
9,000 Erlang
3,200 Mbit/s
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Functions:
Provides two channels over GE optical ports, which are used for IP transmission
Provides the Automatic Protection Switching (APS) function between the active and standby boards
GOUa
6,000 Erlang
6,000 Erlang
840 Mbit/s
6,000 Erlang
6,000 Erlang
840 Mbit/s
6,000 Erlang
3,000 Erlang
840 Mbit/s
Provides the Automatic Protection Switching (APS) function between the active and standby boards
GOUc
18,000 Erlang
18,000 Erlang
2,600 Mbit/s
6,000 Erlang
6,000 Erlang
2,600Mbit/s
Iu-CS
18,000 Erlang
9,000 Erlang
3,200 Mbit/s
HUB
S
C
U
a
S
C
U
a
O
M
U
a
O
M
U
a
S
C
U
a
S
C
U
a
LMT
The LMT is a computer installed with Huawei Local Maintenance Terminal software. It runs under the Windows XP Professional operating system. The RNC can be configured with one or more LMTs. The LMT is connected to the OMUa directly or through the hub and to the alarm box through a serial cable.
OMUa Board
The OMUa board is the Back Administration Module (BAM) of the RNC. The OMUa boards are connected to external devices through Ethernet cables.
The OMUa board serves as a bridge between Front Administration Module (FAM) and BAM of the RNC. Based on the OMUa board, the OM network of the RNC is divided into the following networks:
Internal network: serves the communication between the OMUa and the RNC host.
External network: serves the communication between the OMUa board and the external device, such as the OM terminal LMT or M2000.
NOTE:
The RNC can be configured with one or two OMUa boards. In the latter case, the two boards work in active/standby mode.
SCUa Board
The SCUa is the switching and control board of the RNC. It is responsible for OM of its housing MPS subrack or EPS subrack. A subrack can be configured with two SCUa boards. In this case, the two boards work in active/standby mode.
The SCUa board performs OM on other boards in the same subrack through the backplane channels. The SCUa boards in the MPS are connected to the SCUa boards in the EPSs through Ethernet cables.
LMT
The LMT is a computer installed with Huawei Local Maintenance Terminal software. It runs under the Windows XP Professional operating system. The RNC can be configured with one or more LMTs. The LMT is connected to the OMUa directly or through the hub and to the alarm box through a serial cable.
OMUa Board
The OMUa board is the Back Administration Module (BAM) of the RNC. The OMUa boards are connected to external devices through Ethernet cables.
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Components of the RNC OM Subsystem
The OMUa board serves as a bridge between Front Administration Module (FAM) and BAM of the RNC. Based on the OMUa board, the OM network of the RNC is divided into the following networks:
Internal network: serves the communication between the OMUa and the RNC host.
External network: serves the communication between the OMUa board and the external device, such as the OM terminal LMT or M2000.
SCUa Board
The SCUa is the switching and control board of the RNC. It is responsible for OM of its housing MPS subrack or EPS subrack
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The OMUa board is the back administration module of the BSC6900. It works as a bridge for the communication between the Local Maintenance Terminal (LMT) and the other boards in the BSC6900.
The OMUa board performs the following functions:
Performs the configuration management, performance management, fault management, security management, and loading management functions for the system
Provides the LMT or M2000 users with the operation and maintenance port of the BSC6900 system, to control the communication between the LMT or M2000 and the SCUa board of the BSC6900
Support two Intel LV processor2G memory
Support three ETH port in front plane10/100/1000M Base-T self-adaptationOMU use this network port to connect with the internet directly. It’s more simple compared with the IBM server
Support two paths backboard SERDES to the GE port and the host and standby FE path of the switch board, host and standby OMUOMU and SCU are connected by this port
OMU supports two hard disk interfaces by using the panel network port , connects with two hard disk outside, and be mirror with each other to Raid 1
On the panel of the OMUa board, there are four USB2.0 ports and one BMC com portcan used to system com port
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2.3 BSC6900 Cables
120Ω twisted pair cable and Y-shaped 120Ω twisted pair cable
Straight-Through Network Cables
The straight-through cable is of two types: the shielded straight-through cable and the unshielded straight-through cable.
Optical Fibers
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E1/T1 cable is used to connect E1/T1/J1 port
The Y-shaped 75-ohm coaxial cable/ 120-ohm coaxial cable used in the RNC has two DB44 connectors at one end and has a structure of 2 x 8 cores. That is, the 75-ohm coaxial cable is composed of two cables, each of which contains eight micro coaxial cables. The 16 micro coaxial cables form eight E1 RX/TX links.
(1) DB44 connector
(2) Main label (Identifying the code, version, and manufacturer information of the cable)
(3) Label (Identifying a coaxial cable)
(4) Metal case of the DB44 connector
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The Y-shaped 75-ohm coaxial cable only has two DB44 connectors at one end. You have to make the connector at the other end on site.
W3 and W4 are 75-ohm coaxial cables. W1 and W2 are 100-ohm twisted pair cables. X1 and X2 are DB44 connectors used to connect active and standby AEUa/PEUa boards.
Y-shaped RNC Clock Signal Cable
The RJ45 connector at one end of the Y-shaped RNC clock signal cable is connected to port CLKIN on the SCUa board. The two RJ45 connectors at the other end of the signal cable are connected to ports CLKOUT on the active and standby GCUa/GCGa boards which are located in the MPS subrack.
(1)
(2)
(1)
(1)
(2) RJ45 connector
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The Y-shaped RNC clock signal cable is used to transmit the timing signals from the GCUa/GCGa board to the SCUa board. It is a mandatory configuration. The number of the Y-shaped clock signal cables to be installed in the RNC is decided by the site requirements.
It is used to connect the other NEs
(1) LC/PC Connector
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The RNC LC/PC-LC/PC single-mode optical cable is an optional configuration. It is used to connect the AOUa/GOUa/UOIa board to ODF or other NEs. The number of the LC/PC-LC/PC single-mode optical cables to be installed in the RNC is decided by the site requirements.
Straight-Through Network Cables
The unshielded straight-through cable is used to connect the SCUa boards in different subracks.
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Monitoring Signal Cable of RNC Power Distribution Box
The monitoring signal cable of the RNC power distribution box has a DB9 connector at one end, and has a DB15 connector at the other end
X1: DB9 connector X2: DB15 connector SHELL: Metal case
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When two power distribution boxes are configured for the cabinet, the port for monitoring signal cable on the power distribution box works as the monitoring serial port and is connected to port monitor on the subrack 0 and subrack 3.
RNC Alarm Box Signal Cable
The RNC alarm box signal cable is used to transmit alarm information to the alarm box to display audible and visible warning.
X1: RJ45 connector X2: DB9 connector
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Control plane message flows
Uu interface message flow
Iub interfaces message flows
Iur/Iu interfaces message flows
User plane data flows
CBC Signal flow
OM signal flows
Intra-RNC Control Message Flow on the Uu Interface
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The signaling flow on the uplink is as follows:
The RRC messages from the UE are processed at the physical layer of the NodeB and then are sent to the Iub interface board of the BSC6900 over the Iub interface.
The Iub interface board processes the messages and then sends them to the DPUb board. See signal flow 1 in Figure 1.
If the SPUa board that processes the RRC messages and the Iub interface board that receives the RRC messages are located in different subracks, the messages travel to the MPS for switching. The MPS then sends the messages to the target DPUb board. See signal flow 2 in Figure 1.
The DPUb board processes the messages according to the FP, MDC, MAC, and RLC protocols and then sends the messages to the target SPUa board where the messages are terminated.
The downlink flow is the reverse of the uplink flow.
Inter-RNC Control Message Flow on the Uu Interface
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The RRC messages sent from the UE are processed at the physical layer of the NodeB and then are sent to the Iub interface board of BSC6900-1 over the Iub interface.
The Iub interface board and the DPUb board of BSC6900-1 process the messages and then send them to the Iur interface board of BSC6900-1. NOTE:
When the UE performs a cell update across the Iur interface, the RRC messages travel to the Iur interface board of BSC6900-1 through the SPUa board of BSC6900-1. In any other case, the RRC messages need not pass through the SPUa board of BSC6900-1.
The Iur interface board of BSC6900-1 processes the RRC messages and then sends them to the Iur interface board of BSC6900-2 over the Iur interface between BSC6900-1 and BSC6900-2.
The Iur interface board of BSC6900-2 processes the messages and then sends them to the DPUb board.
The DPUb board processes the messages according to the FP, MDC, MAC, and RLC protocols and then sends the messages to the target SPUa board where the messages are terminated.
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The NodeB transmits the control-plane messages to the Iub interface board of the BSC6900 over the Iub interface.
The Iub interface board processes the messages and then sends them to the SPUa board where the messages are terminated. See signal flow 1 in Figure 1.
If the SPUa board that processes the messages and the Iub interface board that receives the messages are located in different subracks, the messages travel to the MPS for switching. The MPS then sends the messages to the target SPUa board. See signal flow 2 in Figure 1.
Intra-RNC Control Message Flow on the Iu/Iur Interface
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The signaling flow on the downlink is as follows:
The MSC or SGSN sends the control-plane messages to the Iu interface board of the BSC6900 over the Iu interface, or another BSC6900 sends the control-plane messages to the Iur interface board of the local BSC6900 over the Iur interface.
The Iu/Iur interface board processes the messages and then sends them to the SPUa board in the same subrack for processing. See signal flow 1 in Figure 1.
If the SPUa board in the same subrack as the Iu/Iur interface board cannot process the messages, the messages are switched by the MPS to the SPUa board in another subrack. See signal flow 2 in Figure 1.
After being processed by the Iu/Iur interface board, the messages are directly switched by the MPS to the SPUa board in another subrack. See signal flow 3 in Figure 1.
The uplink flow is the reverse of the downlink flow.
Intra-RNC Data Flow Between Iub and Iu-CS/Iu-PS
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The signal flow on the uplink is as follows:
The NodeB processes the data and then sends it to the Iub interface board of BSC6900 over the Iub interface.
The Iub interface board processes the data and sends it to the DPUb board in the same subrack. See signal flow 1 in Figure 1.
If the DPUb board that processes the data and the Iub interface board that receives the data are located in different subracks, the data is switched by the MPS. The MPS then sends the data to the target DPUb board. See signal flow 2 in Figure 1.
The DPUb board processes the data according to the FP, MDC, MAC, RLC, and Iu UP or PDCP/GTP-U protocols, separates the CS/PS user-plane data from other data, and then sends the data to the Iu-CS/Iu-PS interface board.
The Iu-CS/Iu-PS interface board processes the data and then sends it to the MSC/SGSN.
Inter-RNC Data Flow Between Iub and Iu-CS/Iu-PS
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The signal flow on the uplink is as follows:
The NodeB processes the data and then sends it to the Iub interface board of BSC6900-1 over the Iub interface.
The Iub interface board and DPUb board of BSC6900-1 process the data and then send it to the Iur interface board of BSC6900-1. NOTE:
The DPUb board of BSC6900-1 processes the data according to only the FP and MDC protocols.
The Iur interface board of BSC6900-1 processes the data and then sends it to the Iur interface board of BSC6900-2 over the Iur interface between BSC6900-1 and BSC6900-2.
The Iur interface board of BSC6900-2 processes the data and then sends it to the DPUb board.
The DPUb board processes the data, separates the CS/PS user-plane data from other data, and then sends the data to the Iu-CS/Iu-PS interface board.
The Iu-CS/Iu-PS interface board processes the data and then sends it to the MSC/SGSN.
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The signal flow is as follows:
The CBC sends the broadcast data to the Iu-BC interface board of the BSC6900 over the Iu-BC interface.
The Iu-BC interface board processes the data and then sends it to the SPUa board.
The SPUa board processes the data according to the Service Area Broadcast Protocol (SABP) and then sends the data to the target DPUb board. See signal flow 1 in Figure 1.
If the SPUa board cannot process the data, the data travels to the MPS for switching. The MPS then sends the data to the target SPUa board, which processes the data according to the SABP. Then, the SPUa board sends the data to the DPUb board. See signal flow 2 in Figure 1.
The DPUb board processes the data according to the BMC, RLC, and MAC protocols and then sends the data to the Iub interface board.
The Iub interface board processes the data and then sends it to the NodeB.
The NodeB broadcasts the data to the UEs in the cells served by the NodeB.
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bsc6900v900r012 uo system structure-20101218-b-v1.0.ppt

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