Introduction to ZXC10-BSC

1
Introduction to ZXC10-BSC
2
Content

• A BSC overview
• B subsystems of BSC

3
A BSC Overview

• Position in system
• Hardware Architecture
• Mechanical and electrical Features
• Logical Structure
• Performance
• Working environment

4
Position in system

BSS
MS
BSC
BTS
VLR
BTS
BTS
MS
HLR
MSC
PSTN
MS
ISDN
BTS
BSC
BTS
BTS
MS
A Interface
Um Interface
Abis Interface
other MSC
5
Hardware Architecture
TS
SVBS
?
?
?
HIRS
SVBS
TO
CPS
CDSUS
BTS

• HIRS High-speed Interconnect Router Subsystem
• CDSUSChannel/Data Service Unit Subsystem
• SVBS Selector Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem
• BSM Base Station Management Subsystem

6
Mechanical and electrical Features

• BSC consists of central rack and vocoder rack.
• Central rack and vocoder rack apply standard rack
  and insertion box. The different types of
  insertion box are composed of different inserted
  boards.
• From top to bottom, the whole rack contains a
  power distribution insertion box, 35 function
  insertion boxes, a fan box and anti-dirt frame.
• There are three kinds of function insertion
  boxes
• HIRS layer consists of PSMB, NIM, NCM, etc.
• CDSU layer consists of PSMB, CDSU(or CDSU, CPM,
  TCM, GPSTM), etc.
• SVBS layer consists of PSMB, SVM, SVICM, etc.
• Max.number of cards in each function insertion
  box22

7
Rack
8
Central rack
9
Vocoder Rack
10
Logical Structure
11
Performance

• Max. number of E1links of A interface 240(240 x
  30 7200 circuits)
• Max. number of selector/vocoder 7200
• Max. traffic processing capability5040 Erl (7200
  x 0.7)
• BHCA310K
• Max number of subscribers170K(0.03 Erl per
  subscriber,5040/0.03)
• Max number of BTS can be connected to BSC
• 380(single carrier frequency and omni-direction,
  192channels/BTS, 13.2erl,5040/13.2 )
• 128 (single carrier frequency with three
  sectors,192channels/BTS , 60 traffic channel,
  39.6erl,5040/39.6)
• Access Network Interfaces Interoperability
  Specification IOS2.x,IOS3.x,IOS4.x
• Support soft handoff between BSC
• 8K?13K QCELP and 8k EVRC vocoder
• Data service9.6kbps?14.4kbps

12
Working environment

• Long term working temperature 15?35?
• Short term working temperature 0?45?
• Long term working humidity 4065
• Short term working humidity 1590
• The concentration of dirt with diameter larger
  than 5µm should be 3104grains/m. In addition,
  the dirt should not be conductive,
  electro-magnetic or corrosive.

13
B Subsystems of BSC

• HIRS High-speed Interconnect Router
  Subsystem
• CDSUSChannel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

14
B Subsystems of BSC

• HIRS High-speed Interconnect Router Subsystem
  
• CDSUS Channel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

15
HIRS

• HIRS Subsystem is switching center and packet
  data exchange platform of BSS?
• Function of HIRS
• Packet data switching
• Flow control
• Timing distribution,monitor GPS
• Software downloading

16
HIRS Box
POWB NIM NIM NIM NIM NIM NIM NIM NIM NIM NCM NCM NIM NIM NIM NIM NIM NIM NIM NIM NIM P O W B
17
Structure of HIRS
Ethernet Interface
TOD
clk
clk
HIRS
BSM
dis
dis
U gateway
co
U gateway
co
I
2
C
I
2
C
NCM
NCM
NCM
NCM
NIM
NIM
NIM
NIM
CPS
422
CPM
0
CPM
0
7
7
0
7
7
CDSUS
non-channelized E1
non-channelized E1
BDS
BDS
BTS_CDSU
BTS_CDSU
BDS
BTS_CDSU
18
NCM Network Control Module

• Manage the HIRS
• Interface to Base Station Management
  Subsystem(OMC)
• Timing receiving and distributing

19
Structure of NCM
20
Functions of various parts

• U-gateway unit Implements dual-bus arbitration
  and routing the interior or outgoing packet.
• ATM interface unit Implements interconnection to
  another frame, and provides interfaces for future
  expansion.
• Main control unit The CPU system, which
  implements distributing various modules software
  and configuration information modifying,
  notifying and confirming local device status
  maintaining local copy of the configuration
  database detecting, isolating, reporting and
  recovering the HIRS network errors monitoring
  the performance of HIRS network receiving
  broadcast TOD message, controlling and
  maintaining GPSR (GPS receiver). Also it
  implements operation and maintenance of the whole
  BSS system.
• Clock power supply reset unit Provides the power
  supply to the board, and 1.5V power supply to the
  backplane clock driving and distributing
  provide board reset signal.
• Main control logic unit Implements
  active/standby competition and switchover,
  in-board status detection, control and reporting.

21
NCM Panel

• HL12 Running indicator (green), with the
  blinking speed representing different processes
  running
• HL14 Alarm indicator (red), lighting up when a
  software error occurs
• HL2 Active indicator (green), lighting up when
  the board is in active state
• SW5 Manual active/standby switchover button
• SW3 Reset button.

22
NIM -Network Interface Module

• Receive/send RS-422 serial data
• Receive/send data through DISCO
• 81 redundancy
• Clock receiving and distributing

23
Structure of NIM
24
Functions of various parts

• Control unit Implements board startup,
  self-test, status error reporting, N1 switchover
  etc.
• DISCO Unit Transmits the data in the reception
  buffer to the UGATE of the NCM, or saves the data
  from the UGATE into the sending buffer.
• HDLC Unit Receives the HDLC data frames from the
  CPM, NCM, SVICM or CDSU and save them into the
  buffer, or takes data from the sending buffer,
  converts them into the HDLC format and sends them
  to the CPM, NCM, SVICM or CDSU.
• 422 driver Drives the HDLC data code flow, PP2S
  and CHIP signals.
• GTLP driver Drives the DISCO dual-bus data and
  control signals.

25
NIM Panel

• RUN A green indicator, blinking when the board
  works normally.
• ALM A red indicator, blinking or lighting up in
  case of board failure.
• ACT A green indicator, lighting up when the
  board is in master mode.
• RST Reset button.

26
Subsystem of BSC

• HIRS High-speed Interconnect Router Subsystem
• CDSUS Channel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

27
CDSU Subsystem

• Convert signal between RS-422 interface and
  non-channelized E1,transfer signaling and traffic
  data between BSC and BTS.
• BSC-CDSU and BTS-CDSU,and have the same hardware
  structure.

28
BSC-CDSU - Channel/Data Service Unit IN BSC
E1 Interface Unit
Route Arbitra tion Unit
E1 Interface
RS422 Interface Unit
E1 Interface

• Provide the E1 link interconnection with
  BTS-CDSU
• Support flow control
• Supply the RS-422 interface interconnect with
  NIM
• Monitor and maintain E1 link
• Routing and BUS arbitration?

Control Unit
BSC-CDSU
29
BTS-CDSU - Channel/Data Service Unit IN BTS
RS422 Interface Unit
Route Arbiter Unit
E1 Interface
E1 Interface

• Provide the E1 link interconnect with BSC-CDSU
• Support daisy-chain between BTS and provide the
  E1 link
• Provide RS-422 interface interconnect with CCM?
• Monitor and maintain E1 link
• Flow control
• Routing and BUS arbitration

Control Unit
BTS-CDSU
30
CDSU Panel
RUN
ALM
SYNCA

• RUN Running
• ALARM Alarm
• SYNCA Synchronization A
• SYNCB Synchronization B
• RST Reset Button

SYNCB
RST
31
Subsystem of BSC

• HIRS High-speed Interconnect Router
  Subsystem
• CDSUS Channel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

32
SVBS

• SVBS is the physical unit of Selector/Vocoder
  resource pool in BSC,composed of 1 SVICM and 8
  SVMs.
• Path selectionselect a path in several soft
  handoff path by the quality
• Transcodingconvert code between PCM and QCELP or
  EVRC
• Echo cancellation Echo cancellation in forward
  link
• Judge and implement soft handoff
• Power control
• Signaling handling(No.7 and/or v5.2)

33
SVBS Box
POWB SVM SVM SVM SVM SVM SVM SVM SVM SVICM SVICM SVM SVM SVM SVM SVM SVM SVM SVM POWB
34
Structure of SVBS
35
SVICM - Selector Vocoder Interface Control
Module

• S-HIRS
• Distribute forward traffic and signaling(SVM?SVICM
  ? NIM)
• Distribute reverse traffic and signaling
  (SVM?SVICM ? NIM)
• Distribute signaling within SVBS(SVM?SVICM )
• Receive and Distribute Clock and TOD message
• Manage and control SVM
• Interconnect with MSC(LE)

36
Structure of SVICM
37
Functions of various parts

• SVC unit The kernel control part of the SVICM.
  With a high-performance processor as its CPU, it
  is responsible for the maintenance and management
  of the SVBS internal software and configuration
  data and the control and maintenance of various
  SVMs in the SVBS
• DISCO logic unit Implements communication with
  the HIRS network, that is, link with the HIRS
  network of the BSC through a gateway
• Gateway Unit Implements the communication with
  the SVM
• Digital Trunk Interface(DTI) unit Implements the
  PCM link between the MSC and the BSS
• Clock generation unit Generates the working
  clock (20ms) required by the SVBS with the
  received system clock as reference.

38
SVICM Panel

• RUN Running indicator (green), blinking during
  operation
• ALARM Alarm indicator (red), lighting up when a
  software error occurs
• SYNA 1st E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• SYNB 2nd E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• SYNC 3rd E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• SYND 4th E1 connection indicator, lighting up to
  indicate that the E1 link is connects
• RST Reset button.

39
SVM - Selector Vocoder Module

• transcoding between PCM and QCELP or EVRC
• reverse outer-loop power control
• soft handoff
• handle layer 3 of Abis interface and layer 2 of
  IS-95 signaling
• assign the timeslot

40
Function of SVM

• selector/vocoder processor
• selector/vocoder Element

SVICM receive traffic data from the RS-422
port of NIM then forward to SVM,SVP forward to
SVE,SVE transcoding to PCM and send through HW,in
other direction,SVE transcoding PCM to QCELP or
EVRC,then send to SVP,then to SVICM,and then
NIM. A SVM contain 1 SVP and 15 SVEs.
41
Structure of SVM
42
Functions of various parts

• Main control unit Performs the control of SVE
  and data interface unit implements selector and
  power control functions fault detection and
  reporting
• Data interface unit Provides a packet data
  interface for the communication within the BSS
  system
• HW interface unit Implements PCM clock
  conversion and provides PCM code flow data
  channel for SVE
• SVE Implements PCM-QCELP conversion, with 15
  vocoders
• Clock, reset and power circuit Implements clock
  and board reset of the main control unit, and
  provides all types of power supplies, including
  5V, 3.3V and 2.5V.

43
SVM Panel

• RUN Running indicator (green), blinking during
  working normally
• ALARM Alarm indicator (red), lighting up when a
  software error occurs
• RESET Reset button.

44
Subsystem of BSC

• HIRS High-speed Interconnect Router Subsystem
• CDSUS Channel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

45
Timing Subsystem

• According to the CDMA standard,BSC and BTS
  independently synchronize the timing signal
  provided by GPS
• Timing subsystem provide such timing signal
• PP2S
• 16chips19.6608MHz
• TOD message

46
GPSTM GPS Timing Module
47
TCM Timing Control Module
48
TCM Panel

• RUN green Lights up when the TCM
  works normally
• ALM red Lights up when the TCM
  works abnormally
• LOCK green Lights up when the TCM is
  locked
• CLK an SMA socket, used for monitoring of the
  TCMs 16chip timing signal
• PP2S an SMA socket, used for monitoring of the
  TCMs PP2S timing signal and for BS testing

49
timing distributing of BSC
50
Subsystem of BSC

• HIRS High-speed Interconnect Router Subsystem
• CDSUS Channel Data Service Unit Subsystem
• SVBS Selector/Vocoder Bank Subsystem
• TS Timing Subsystem
• CPS Call Processing Subsystem

51
CPS

• CPS is a joint point of BSS systems resource
  management and call signaling protocol
  processing.
• Handle the signaling of ABIS interface
• Radio resource management and distribution,
• Trunk resource management
• Processing of MTP3 and SCCP of SS7

52
CPM - Call Processing Module

• Control over loading of BSSproduce the message
  of A and ABIS interfaceestablish the signaling
  link to CCM and SVICM
• Radio channel resource management, maintenance
  and distribution
• SS7 /v5.2 interface
• Manage the database of BSS,include the
  parameters,trunk resource, radio channel
  resource, traffic channel resource, call
  record,performances record,handoff record.

53
CPS Box
PSMA CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU CDSU PAM CPM CPM GPSTM TCM GPSTM PSMA
54
Hardware feature of CPM

• According to the software function of CPM,CPM
  should have the Hardware features below
• CPS sub-system is a joint point of BSS systems
  resource management and call signaling protocol
  processing,processing all the signaling,so the
  CPM should be powerful.
• CPS sub-system is a joint point of BSS systems
  resource management and call signaling protocol
  processing,so the CPM should be 11 hot standby

55
Structure of CPM
56
Function of various parts

• CPU1 Connection and communication with the HIRS
  
• Dual-port RAM Communication path between two
  CPUs
• CPU2 The kernel of the CPM, implements the call
  processing function

57
CPM panel

• RUN green running indication
• ALM red error status indication
• ACT green active status indication
• M/S active/standby switch
• RST reset
• TEST1 CPU1 debugging port
• TEST2 CPU2 debugging port

58
Other Module

• PAMPower Alarm Module

59
PAM

• monitor the running status of the power supply
  modules in the BSC-side frames and the equipment
  room environment signals, including temperature,
  humidity and smoke,
• report the result to the background operation and
  maintenance console through the NCM for
  processing
• provides duplex RS232 and RS485 interfaces for
  the connection of external monitoring devices and
  alarm box.

60
Structure of PAM
61
PAM Panel

• RUN, green, indicating normal operation status of
  the board software
• AlM, red, indicating communication error and
  environment alarm
• RST, reset of the board

62
Address scenario
63
The end !