cdma cdma bsc

7/18/2019 Cdma Cdma Bsc

1/63

ZTE CDMA

Introduction to

ZXC10-BSC


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ZTE CDMA

Content

A BSC overview

B subsystems of BSC


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ZTE CDMA

A BSC Overview

Position in system

Hardware Architecture

Mechanical and electrical Features

Logical Structure

Performance Working environment


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ZTE CDMA

Positionin system

MS

MS

MSBTS BTS

BTS BSC

MSC

BTS

BTS

BTS

BSC

Um Interface Abis Interface

SS

PSTN

HLR

VLR

other MSC

ISDN

MS

A Interface


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ZTE CDMA

Hardware Architecture

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

HIRSBSM

SVBS

CPSCDSUSTO

BTS

SVBS

TS TO

MSC/LE


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ZTE 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, CDSUor CDSU, CPM, TCM,

GPSTM, etc.

SVBS layer: consists of PSMB, SVM, SVICM, etc.

Max.number of cards in each function insertion box:22


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Rack


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Central rack


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Vocoder Rack


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Logical Structure

BSC

HIRS

NCM

NIM

BSC_CDSU

BSM

System

Subsystem

Module

SVBS

SVICM

SVM

SVE

SVP

Unit

CDSUS

GPSTM

CPM

CPSTS

TCM


11/63ZTE CDMA

Max. number of E1links of A interface: 240240 x 30 =7200 circuits

Max. number of selector/vocoder :7200

Max. traffic processing capability:5040 Erl 7200 x 0.7

BHCA310K

Max number of subscribers170K0.03 Erl per subscriber5040/0.03

Max number of BTS can be connected to BSC 380single carrier frequency and omni-direction, 192channels/BTS, 13.2erl

5040/13.2

128 (single carrier frequency with three sectors,192channels/BTS , 60 traffic

channel39.6erl5040/39.6)

Access Network Interfaces Interoperability Specification : IOS2.xIOS3.x

IOS4.x

Support soft handoff between BSC

8K13K QCELP and 8k EVRC vocoder

Data service9.6kbps14.4kbps

Performance


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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

5mshould be 3104grains/m. In addition, the dirt

should not be conductive, electro-magnetic or

corrosive.


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B Subsystems of BSC

HIRS High-speed Interconnect RouterSubsystem

CDSUSChannel Data Service Unit Subsystem

SVBS Selector/Vocoder Bank Subsystem

TS Timing Subsystem



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B Subsystems of BSC

HIRS High-speed Interconnect Router

Subsystem



TS Timing Subsystem



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HIRS

HIRS Subsystem is switching center and packetdata exchange platform of BSS

Function ofHIRS

Packet data switching

Flow control

Timing distributionmonitor GPS

Software downloading


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HIRS Box

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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


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NCM Network Control Module

Manage the HIRS

Interface to Base Station Management

Subsystem(OMC)

Timing receiving and distributing


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Structureof NCM

U-

Gatewa

Unit

ATM

I/F

Unit

Main Control

Unit

CLK, Power & Reset

Unit

Main Control

Logic Unit

DISCO

422 232

Ethernet

19.44M

CHIP PP2S

M/S

Control

Signal

LVDS

I/F


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Functions of various parts

U-gateway unit: Implements dual-bus arbitration and routing the interior oroutgoing packet.

ATM interface unit: Implements interconnection to another frame, andprovides interfaces for future expansion.

Main control unit: The CPU system, which implements distributing variousmodulessoftware and configuration information; modifying, notifying andconfirming local device status; maintaining local copy of the configurationdatabase; detecting, isolating, reporting and recovering the HIRS networkerrors; monitoring the performance of HIRS network; receiving broadcastTOD 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; provideboard reset signal.

Main control logic unit: Implements active/standby competition and

switchover, in-board status detection, control and reporting.


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ZTE CDMA

HL12

HL14

HL2

SW5

SW3

NCM Panel

HL12: Running indicator (green), with the

blinking speed representing different processesrunning;

HL14: Alarm indicator (red), lighting up whena 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.


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ZTE CDMA

NIM Network Interface Module

Receive/send RS-422 serial data

Receive/send data through DISCO

81redundancy

Clock receiving and distributing


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ZTE CDMA

Structureof NIM

Back

Plane

422

Driver

GTLP

Driver

HDLC

Unit

DISCO

Unit

BufferControl Unit


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ZTE CDMA


Control unit: Implements board startup, self-test, status errorreporting, N+1 switchover etc.

DISCO Unit: Transmits the data in the reception buffer to theUGATE 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 takesdata from the sending buffer, converts them into the HDLCformat and sends them to the CPM, NCM, SVICM or CDSU.

422 driver: Drives the HDLC data code flow, PP2S and CHIPsignals.

GTLP driver: Drives the DISCO dual-bus data and control

signals.


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ZTE 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


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ZTE CDMA

Subsystem of BSC

HIRS: High-speed Interconnect Router Subsystem



TS Timing Subsystem



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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.


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ZTE CDMA

BSC-CDSUChannel/Data Service Unit IN BSC

RS422Interfa

ceUnit

Route

Arbitra

tion

Unit 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


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ZTE CDMA

BTS-CDSUChannel/Data Service Unit IN BTS

RS422 Interface Unit

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

Route Arbiter Unit


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ZTE CDMA

CDSU Panel

RUN Running

ALARM Alarm

SYNCA Synchronization A SYNCB Synchronization B

RST Reset Button

RUN

ALM

SYNCA

SYNCB

RST


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ZTE CDMA

HIRS: High-speed Interconnect Router

Subsystem



TS Timing Subsystem


Subsystem of BSC


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SVBS

SVBS is the physical unit of Selector/Vocoder resource pool inBSC,composed of 1 SVICM and 8 SVMs.

Path selectionselect a path in several soft handoff path bythe quality

Transcodingconvert code between PCM and QCELP orEVRC

Echo cancellation: Echo cancellation in forward link

Judge and implement soft handoff

Power control

Signaling handling(No.7 and/or v5.2)


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SVBS Box

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Structureof SVBS

SVICM

SVM1 SVM2 SVM8E1

To

MSC(LE)

RS422

To HIRSDISCO BUS


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ZTE CDMA

SVICMSelector & Vocoder Interface Control Module

S-HIRS Distribute forward traffic and signalingSVMSVICMNIM

Distribute reverse traffic and signalingSVMSVICMNIM

Distribute signaling within SVBSSVMSVICM

Receive and Distribute Clock and TODmessage

Manage and control SVMInterconnect with MSC(LE)


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ZTE CDMA

Structureof SVICM

E1X4

fromto MSC

2M HW X4

Fromto SVM

Gateway

Unit

SVC

Bus

Driver

CO

Dis

RS-422

DTI unit

Debug Interface

Monitor Interface

DISCO Bus

Interface

Unit

Clock

Generate

Unit

5M

5M

16.384M

20M

GPS

2M8K20ms

PP2SChip


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ZTE CDMA


SVC unit: The kernel control part of the SVICM. With a high-performance processor as its CPU, it is responsible for themaintenance and management of the SVBS internal software andconfiguration data and the control and maintenance of variousSVMs in the SVBS;

DISCO logic unit: Implements communication with the HIRSnetwork, that is, link with the HIRS network of the BSC througha gateway;

Gateway Unit: Implements the communication with the SVM;

Digital Trunk Interface(DTI) unit: Implements the PCM linkbetween the MSC and the BSS;

Clock generation unit: Generates the working clock (20ms)

required by the SVBS with the received system clock as reference.


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ZTE CDMA

SVICM Panel

RUN: Running indicator (green), blinking duringoperation;

ALARM: Alarm indicator (red), lighting up when asoftware error occurs;

SYNA: 1st E1 connection indicator, lighting up toindicate that the E1 link is connects;

SYNB: 2nd E1 connection indicator, lighting up toindicate 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 toindicate that the E1 link is connects;

RST: Reset button.

RUN

ALM

SYNA

SYNB

SYNC

SYND

RST


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ZTE 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


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ZTE CDMA

Function of SVM

SVP

SVE1

SVE2

SVE15

HW

selector/vocoder processor

selector/vocoder Element

SVICM receive traffic data from the RS-422 port of NIM thenforward 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.


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ZTE CDMA

Structureof SVM

Main

Control

Unit

SVE

DSP1

DSP5

Data Interface

Unit

HW

Interface

B

a

ck

p

l

an

e

Clock,Reset

And Power

circuit


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ZTE CDMA


Main control unit: Performs the control of SVE and datainterface unit; implements selector and power controlfunctions; 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.


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ZTE 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


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ZTE CDMA

HIRS: High-speed Interconnect Router

Subsystem

CDSUSChannel Data Service UnitSubsystem


TS Timing Subsystem


Subsystem of BSC


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ZTE CDMA

Timing Subsystem

According to the CDMA standard,BSC and BTS independentlysynchronize the timing signal provided by GPS

Timing subsystem provide such timing signal:

* PP2S

* 16chips19.6608MHz

* TOD message

CHM1GPSTM TCM

CHM1NCM1

CHM1NCM2

TS


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ZTE CDMA

GPSTM GPS Timing Module

GPS CLOCK

RECEIVING

GPS

PLL

1PPS

GPS CLOCK

RECEIVING

GPS

PLL

1PPS

G

PS

T

M

B

P

10MHz

16chip

1PPS

Control interface

10MHz

16chip

1PPS

Control interface

10MHz

PP2S

TOD

Control interface

19.6608MHz

GPS Data

GPS Data

GPS antenna

part

GPSTM

GPSTM

TOD

TOD


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ZTE CDMA

TCM Timing Control Module


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ZTE CDMA

TCM Panel

RUN green Lights up when the TCMworks 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 TCMs16chip timing signal

PP2S: an SMA socket, used for monitoring of

the TCMs PP2S timing signal and for BS

testing

timing distributing of BSC


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ZTE 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_clock,

Rx_clock

1.2288MHz,PP2S,8kHz,2MHz,50Hz,

Tod

NIM

NIM SVM

SVM

1.2288MHz,PP2S

,Tod,Tx_clock,

Rx_clock

1.2288MHz,PP2S,

8kHz,2MHz,50Hz,

Tod

BSC_CDSU

CPM

GPS

TM

G

PSTMBP

TC

M

timing distributing of BSC


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ZTE CDMA

HIRS: High-speed Interconnect Router Subsystem



TS Timing Subsystem


Subsystem of BSC


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ZTE CDMA

CPS is a joint point of BSS systems resourcemanagement 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


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ZTE CDMA

CPMCall Processing Module

Control over loading of BSS;produce the message ofA and ABIS interface:establish the signaling link toCCM and SVICM

Radio channel resource management, maintenance

and distributionSS7 /v5.2 interface

Manage the database of BSS,include theparameters,trunk resource, radio channel resource,

traffic channel resource, call record,performancesrecord,handoff record.


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ZTE CDMA

CPS Box

P

SM

A

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

C

DS

U

P

AM

C

PM

C

PM

G

PS

T

M

T

CM

G

PS

T

M

P

SM

A


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ZTE CDMA

Hardware feature of CPM

According to the software function of CPM,CPMshould have the Hardware features below

CPS sub-system is a joint point of BSS systemsresource 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 systemsresource management and call signaling protocol

processingso the CPM should be 1+1 hot standby

S f C


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ZTE CDMA

Structure of CPM

CPU1

M/SController

Debugging port

Standby

CPMCPU2 Debugging port

NIM

DPRAM

RS232/Ethernet

BDMInterface

M/SCommunication

CPM

RS232/EthernetBDM Interface

F ti f i t


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ZTE 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, implementsthe call processing function

C


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ZTE 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/Standby

Status Indicator

Error Status

Indicator

Active/Standby

Switch Button

Reset Button

CPU1 EthernetDebugging Port

CPU2 Ethernet

Debugging Port

Oth M d l


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ZTE CDMA

Other Module

PAM:Power Alarm Module

PAM


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ZTE CDMA

PAM

monitor the running status of the power supplymodules in the BSC-side frames and theequipment room environment signals, including

temperature, humidity and smoke,

report the result to the background operation andmaintenance console through the NCM for

processing;

provides duplex RS232 and RS485 interfaces forthe connection of external monitoring devices andalarm box.

St t f PAM


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ZTE CDMA

Structure of PAM

Sensor

I/F

CPUHDLC

Commun-

ication

Contro-

ller

Memory

UARTCommun-

ication

Contro-

ller

Power

Board

External

scout &

control

device

Smog,Temperature,

Humidity ...

NCM

Alarm box

PAM P l


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ZTE CDMA

PAM Panel

RUN, green, indicating normal operationstatus of the board software

AlM, red, indicating communication

error and environment alarm RST, reset of the board

PAM

RUN

ALM

RSTReset Botton

Green led, Run

lamp

Red led, Alarm

lamp

Add i


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ZTE CDMA

Address scenario

Flow

contr

ol

type BssIDSubN

etNode Port Path Modul Unit

2bit 2bit 3bit 1bit 4bit 4bit 4bit 4bit 8bit

For routing in

-HIRSFor routing in

S-HIRS


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