View
289
Download
4
Category
Preview:
Citation preview
ZTE 中兴 CDMA
Introduction to ZXC10-BSC
ZTE 中兴 CDMA
Content
A BSC overview
B subsystems of BSC
ZTE 中兴 CDMA
A BSC Overview
Position in system Hardware Architecture Mechanical and electrical Features Logical Structure Performance Working environment
ZTE 中兴 CDMA
Position in system
MS
MS
MSBTS BTS
BTSBSC
MSC
BTSBTS
BTS
BSC
Um Interface Abis Interface
BSS
PSTN
HLR
VLR
other MSC
ISDN
MS
A Interface
ZTE 中兴 CDMA
Hardware Architecture
HIRS : High-speed Interconnect Router Subsystem
CDSUS : Channel/Data Service Unit Subsystem
SVBS : Selector & Vocoder Bank Subsystem
TS : Timing Subsystem
CPS : Call Processing Subsystem
BSM : Base Station Management Subsystem
HIRSBSM
SVBS
CPSCDSUSTOBTS
SVBS
。。。
TS TO
MSC/LE
ZTE 中兴 CDMA
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, 3~5 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 box:22
ZTE 中兴 CDMA
Rack
ZTE 中兴 CDMA
Central rack
ZTE 中兴 CDMA
Vocoder Rack
ZTE 中兴 CDMA
Logical Structure
BSC
HIRS
NC
M
NIM
BS
C _C
DS
U
BSM
System
Subsystem
Module
SVBS
SV
ICM
SV
MS
VE
SV
P Unit
CDSUS
GP
ST
M
CP
M
CPSTS
TC
M
ZTE 中兴 CDMA
Max. number of E1links of A interface: 240 ( 240 x 30 =7200 circuits ) Max. number of selector/vocoder :7200
Max. traffic processing capability:5040 Erl ( 7200 x 0.7 ) BHCA : 310K
Max number of subscribers : 170K ( 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 service : 9.6kbps 、 14.4kbps
Performance
ZTE 中兴 CDMA
Working environment
Long term working temperature: +15℃~+35℃
Short term working temperature: 0℃~+45℃
Long term working humidity: 40%~65%
Short term working humidity: 15%~90%
The concentration of dirt with diameter larger than 5μm should be ≤3×104grains/m. In addition, the dirt should not be conductive, electro-magnetic or corrosive.
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
NCMNCM
NIM NIM
disco
7 0 7 0
NCMNCM
NIMNIM
dis
co
077
BSC_CDSU
BSM
TS
TOD clkclk Ethernet InterfaceHIRS
CPMCPM
CPS
422
I 2 CI 2 C
U gateway
non-channelized E1
SVBS
BTS_CDSU
BDS
BTS_CDSU
BDS
BTS_CDSU
BDS
Structure of HIRS
CDSUSBSC_CDSU
SVBS
U gateway
non-channelized E1
ZTE 中兴 CDMA
NCM —— Network Control Module
Manage the HIRS
Interface to Base Station Management Subsystem(OMC)
Timing receiving and distributing
ZTE 中兴 CDMA
Structure of NCM
U-
G
at
e
Gateway Unit
ATM
I / F Unit
Mai n Control Uni t
CLK, Power & Reset Uni t
Mai n Control Logi c Uni t
DISCO
422 232
Ethernet
. 19. 44M
CHIP PP2S
M/ S Control Si gnal
LVDS
I/F
ZTE 中兴 CDMA
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.
ZTE 中兴 CDMA
HL12
HL14
HL2
SW5
SW3
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.
ZTE 中兴 CDMA
NIM - Network Interface Module
Receive/send RS-422 serial data
Receive/send data through DISCO
8 + 1 redundancy
Clock receiving and distributing
ZTE 中兴 CDMA
Structure of NIM
Back
Plane
422 Dri ver
GTLP
Dri ver
HDLC
Uni t
DI SCO
Uni t
Buffer Control Uni t
ZTE 中兴 CDMA
Functions of various parts
Control unit: Implements board startup, self-test, status error reporting, N+1 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.
ZTE 中兴 CDMA
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.
NIM
RUN
ALM
ACT
RST
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
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.
ZTE 中兴 CDMA
BSC-CDSU - Channel/Data Service Unit IN BSC
RS
422 Interface Unit
RouteArbitrationUnit E1 Interface
Control Unit
BSC-CDSU
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 。
E1 Interface
E1 Interface Unit
ZTE 中兴 CDMA
BTS-CDSU - Channel/Data Service Unit IN BTS
RS422 Interface Unit
E1 Interface
Control Unit
BTS-CDSU
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
E1 Interface
Route Arbiter Unit
ZTE 中兴 CDMA
CDSU Panel
RUN Running
ALARM Alarm
SYNCA Synchronization A
SYNCB Synchronization B
RST Reset Button
RUN
ALM
SYNCA
SYNCB
RST
ZTE 中兴 CDMA
HIRS: High-speed Interconnect Router Subsystem
CDSUS : Channel Data Service Unit Subsystem
SVBS : Selector/Vocoder Bank Subsystem
TS : Timing Subsystem
CPS : Call Processing Subsystem
Subsystem of BSC
ZTE 中兴 CDMA
SVBS
SVBS is the physical unit of Selector/Vocoder resource pool in BSC,composed of 1 SVICM and 8 SVMs.
Path selection : select a path in several soft handoff path by the quality
Transcoding : convert 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)
ZTE 中兴 CDMA
SVBS Box
POWB
SVM
SVM
SVM
SVM
SVM
SVM
SVM
SVM
SVICM
SVICM
SVM
SVM
SVM
SVM
SVM
SVM
SVM
SVM
POWB
ZTE 中兴 CDMA
Structure of SVBS
SVI CM
SVM1 SVM2 SVM8 E1
To MSC(LE)
RS422
To HI RS DISCO BUS
ZTE 中兴 CDMA
SVICM - Selector & Vocoder Interface Control Module
S-HIRS Distribute forward traffic and signaling ( SVMSVICM NIM ) Distribute reverse traffic and signaling ( SVMSVICM NIM ) Distribute signaling within SVBS ( SVMSVICM )
Receive and Distribute Clock and TOD message
Manage and control SVM
Interconnect with MSC(LE)
ZTE 中兴 CDMA
Structure of SVICM
ZTE 中兴 CDMA
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.
ZTE 中兴 CDMA
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.
RUN
ALM
SYNA
SYNB
SYNC
SYND
RST
ZTE 中兴 CDMA
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
SVM - Selector & Vocoder Module
ZTE 中兴 CDMA
Function of SVM
SVP
SVE1
SVE2
SVE15
数据接口
维护总线
HW 接口 时钟接口
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.
ZTE 中兴 CDMA
Structure of SVM
Mai n Control Uni t
SVE
DSP1
……
DSP5
Data Interface
Unit
HW
Interface
Backplane
Cl ock, Reset And Power ci rcui t
ZTE 中兴 CDMA
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.
ZTE 中兴 CDMA
SVM Panel
RUN: Running indicator (green), blinking during working normally;
ALARM: Alarm indicator (red), lighting up when a software error occurs;
RESET: Reset button.
RUN
ALARM
RESET
ZTE 中兴 CDMA
HIRS: High-speed Interconnect Router Subsystem
CDSUS : Channel Data Service Unit Subsystem
SVBS : Selector/Vocoder Bank Subsystem
TS : Timing Subsystem
CPS : Call Processing Subsystem
Subsystem of BSC
ZTE 中兴 CDMA
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* 16chips : 19.6608MHz* TOD message
C H M 1G P S TM TC M
C H M 1N C M 1 C H M 1N C M 2
TS
ZTE 中兴 CDMA
GPSTM — GPS Timing Module
GPS CLOCKRECEIVING
GPSPLL
1PPS
GPS CLOCKRECEIVING
GPSPLL
1PPS
GPSTMBP
10MHz
16chip
1PPS
Control interface
10MHz
16chip
1PPS
Control interface
10MHz
PP2S
TOD
Control interface
19.6608MHz
GPS Data
GPS Data
GPS antennapart
GPSTM
GPSTM
TOD
TOD
ZTE 中兴 CDMA
TCM — Timing Control Module
TCMinsertedstatus
10MHz.A
10MHz.B
16Chip.A
16Chip.B
PP2S.A
PP2S.B
FDM1
FDM2
GPSTM.A inserted statusGPSTM.B inserted status
main controllerIIC BUS
local rack
local rack
extended rack
extended rack
local rack
local rack
extended rack
extended rack
10MHz bufferand
distributioncircuit
16xChip PLLregenerator and
distributioncircuit
PP2Sregenerator and
distributioncircuit
IIC interfacecircuit
10MHzselector
16xChipselector
PP2Sselector
ZTE 中兴 CDMA
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 TCM’s 16chip timing signal
PP2S: an SMA socket, used for monitoring of the TCM’s PP2S timing signal and for BS testing
ZTE 中兴 CDMA
GPSTM
HIRS1
NCM
NCM
HIRS2
NCM
NCM
SVICM
SVICM
19. 6608MHz,10MHz, PP2S,
Tod
19. 6608MHz,10MHz, PP2S,
Tod
1. 2288MHz,PP2S, Tod
1. 2288MHz,PP2S, Tod
1. 2288MHz, PP2S, Tod, Tx_cl ock,
Rx_cl ock
1. 2288MHz, PP2S,8kHz, 2MHz, 50Hz,
Tod
NIM
NIM SVM
SVM
1. 2288MHz, PP2S, Tod, Tx_cl ock,
Rx_cl ock
1. 2288MHz, PP2S,8kHz, 2MHz, 50Hz,
Tod
BSC_CDSU
CPM
GPSTM
GPSTMBP
TCM
timing distributing of BSC
ZTE 中兴 CDMA
HIRS: High-speed Interconnect Router Subsystem
CDSUS : Channel Data Service Unit Subsystem
SVBS : Selector/Vocoder Bank Subsystem
TS : Timing Subsystem
CPS : Call Processing Subsystem
Subsystem of BSC
ZTE 中兴 CDMA
CPS is a joint point of BSS system’s 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 CPM
CPS
ZTE 中兴 CDMA
CPM - Call Processing Module
Control over loading of BSS;produce the message of A and ABIS interface:establish 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.
ZTE 中兴 CDMA
CPS Box
PSMA
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
CDSU
PAM
CPM
CPM
GPSTM
TCM
GPSTM
PSMA
ZTE 中兴 CDMA
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 system’s 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 system’s resource management and call signaling protocol processing , so the CPM should be 1+1 hot standby
ZTE 中兴 CDMA
Structure of CPM
CPU1
M/ S Control l er
Debuggi ng port
Standby
CPM CPU2 Debuggi ng port
NIM
DPRAM
RS232/Ethernet BDM I nterf ace
M/ S Communi cat i on
CPM
RS232/Ethernet BDM I nterf ace
)
ZTE 中兴 CDMA
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
ZTE 中兴 CDMA
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
RUN
ALM
ACT
TEST1
M/S
RST
TEST2
Running Indicator
Active/StandbyStatus Indicator
Error StatusIndicator
Active/StandbySwitch Button
Reset Button
CPU1 EthernetDebugging Port
CPU2 EthernetDebugging Port
ZTE 中兴 CDMA
Other Module
PAM:Power Alarm Module
ZTE 中兴 CDMA
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.
ZTE 中兴 CDMA
Structure of PAM
SensorI/F
CPU
HDLCCommun-icationContro-
ller
Memory
UARTCommun-icationContro-
ller
PowerBoard
Externalscout &controldevice
Smog,Temperature,Humidity ...
NCM
Alarm box
ZTE 中兴 CDMA
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
PAM
RUNALM
RSTReset Botton
Green led, Runlamp
Red led, Alarmlamp
ZTE 中兴 CDMA
Address scenario
Flow control
type BssID SubN
et Node Port Path Modul Unit
2bit 2bit 3bit 1bit 4bit 4bit 4bit 4bit 8bit
For routing in
B-HIRS For routing in
S-HIRS
ZTE 中兴 CDMA
The end !
Recommended