Cdma Cdma Bsc

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


CDSUS ： Channel Data Service Unit Subsystem

SVBS ： Selector/Vocoder Bank Subsystem



ZTE 中兴 CDMA

B Subsystems of BSC






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


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





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






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


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


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






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






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 !

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