CDMA System

Configuration !

System Architecture

MSC VLRBSCBTS

MSC EIR IWF

HLRSCSC

ESME

MS

VLR

A B

C D

E F L

Q

M

M H

G

AbisUm

AUC

PDSN

WIN/VMS

A REAL CDMA system

MSC BSC BTS

System Architecture

BSS

BTS BSC

HIRS

NC

M

NIM

GPST

M

SVIC

M

SVM

SVBS

CPM

CPS

BSC

_CD

SU

BSM

系统

子系统

模块

CE

C

HP

SVE

SVP 单元

SIE

PAM

CDSUTS

TC

M

RFS BDS

TR

XH

PAR

FE

CH

M

CC

M

RFIM

BT

S_CD

SU

FDM

GPST

M

RFC

MT

XU

TX

UR

SUIQ

U

SAM

TC

M

TFS

BT

M

BSS configuration

• BTS configuration

• BSC/PCF configuration

• PDSN configuration

BTS configuration preparation

• Um loss(GOS)

• Traffic per sub

• Soft handoff rate

• Antennae

Channels on the BTS

BTS calculation

Traffic per subTotal capacity

Total Traffic

BTSQty.

ErlTable B

Traffic per BTS

SCTQty. Traffic per SCT

Traffic per BTS

ChannelsPer sector

Divided by sector Qty.

Capacity adjust

• Because of the data service has influence on the voice capacity– Manual adjust

Antenna Choosing

• Omni

• Sector

• Single Polarization

• Dual Polarization

• Antenna Gain

PCF PDSN

• Ratio of data user

• Calculation module

• Total traffic

• Calculation of “Qty. Of BSC Data Element（ SDE） (actived PPP）”

IWF

• Ratio of circuit data user

• Total traffic

• Calculation of “Qty. Of BSC Circuit Data Element”

BSS configuration Summary

• Traffic

• GOS

• Erl B table– Voice Channel– Data Channel “Qty. Of BSC Data Element（ SDE） (active PPP）”

– Circuit data Channel ”Qty. Of BSC Circuit Data Element”

MSS configuration

• MSC

• HLR

• SC

MSC configuration

• Key points– Should we co-locate the MSC & HLR

• Save a SS7 transfer Rack

– Capacity of MSC/HLR– Traffic per sub– SS7 links calculation

MSC & HLR

MSC HLR

SS7ToIP

SS7 links

(E1)

IP

Ethernet

SS7 calculation

• Signaling over A interface

• Signaling to HLR

• Signaling to PSTN

• Signaling to other MSC

• Signaling to SC

• Signaling to VMS

• ……… Headache

MSC auto-calculation

PDSN,SC

• Total Qty. of sub supported

• Traffic

Other configuration

• WIN

• VMS

• Transmission/Microwave

• Power system

• DDF

Real Picture of BSC

• HIRS: 高速互联路由子系统 NCM: 网络控制板 NIM: 网络接口板

• CDSU:信道数据服务单元• CPS: 呼叫处理子系统

CPM: 呼叫处理模块• TS：时钟子系统

TCM：时钟控制模块 GPSTM：GPS/GLONASS接收模块

• SVBS:声码器 /选择器子系统 SVM:声码器 /选择器模块 SVICM:声码器 /选择器控制模块

• PCFS：分组数据业务子系统 PCF：分组数据业务模块 PCFIM：分组数据业务接口控制模块

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF I M

PCF I M

SVBS

• Codec for QCELP,EVRC and 64kb/s PCM• CDMA system power control functions• Signaling interface between MSC and BSC(SS7)• Selector

Selector : process the routines of Handoff/Handover

CODECSVBS64K PCM

Wireless

Wireless

8K EVRC

SVBS

NIM

DIS

CO

SVM ... SVM SVM

HW

SVICM

E1MSCSVBS

•One SVM can handle 15 channels

• One SVBS sub-system can handle 120 channels

•One ESVIM can handle 6 IWF channels

•One SVBS rack can hold 10 SVBS sub-system

•One BSC can support 6 SVBS racks

CDSU

BSC BTS

CDSU

CDSU

CDSU

CDSU

CDSUAbis

Non-channelized E1

SDHPDH

SatelliteMicroWave

….

•192 channels per 1 E1.•Based on Packet data mode

CDSU

CCM

CHM

CPM

SVI CM

SVM

Am

Abi sc

Abi sdAv

Aba

Abi st

BTS BSC

AbisBased

OnCDSU

•Data communication between BTS and BSC

•Using normal E1

•Daisy chain networking

BTS BTSBTS

E1 E1

To BSC

BasebandSubsystem

CEs

TRXs HPAs/LPAs RFEs

Local RF Subsystem

TRXs HPAs/LPAs RFEs

Remote RF Subsystem

Cable

Fiber

GPS* BTS

BTS

GPSGPS + GPSGPS + GlonassGlonass

BTS Data flow

ZXC10-BTS 1x80基站收发信机机架结构

• RFS:射频子系统 RFE: 射频前端 HPA: 高功放 TRX: 收发信机

• TFS：时钟频率子系统– GPS– TCM– FDM

• BDS:基带调制解调子系统 RFIM: 射频接口模块 CHM32/64: 1x信道板 CCM: 通信控制板

• CDSU:信道数据服务单元

Antenna

Sector Antenna

• 20、 30、 65、 90、 105、 120、 180

Polarity single

Polarity Dual

Antenna choose 1

20、 30 (normally with high gain)for narrow belt areas and highways65 :for density urban city. Standard antenna90 :for suburb areas105: for low traffic areas, like mountain areas with vast coverage needs120、 180 : for some very wide angle coverage. Seldom use.

Antenna choose 2

• Antenna Gain– Higher gain, longer shooting range– Less gain , larger coverage near antenna

• Polarity– Dual polarized antennas are easy to be with

higher gains– Dual polarized antennas are easier to install

Antenna Gain

• Normal Gain Higher Gain Lower Gain

An

tenn

a

An

tenn

a

An

tenn

a

Polarity

• Single polarity antenna work in pairs. Engineering is very hard to do

• Dual polarity antenna work with one enough. Engineering is very easy.

• Omni antenna is single polarity only

An

tenn

a

An

tenn

a

An

tenn

a

Relative position has to

be carefully adjusted

Single polarity antenna Dual polarity antenna

Tilt

PART II How to do configuration

• BSC– SVM/PCF Capacity– CDSU How many base stations

• BTS– CHM Capacity– RF Module Carriers/Sectors

PART II How to do configuration

• International market is special

• Making configuration is difficult then domestic market

Estimate

BSC: 5040Erl,7200

BTS: 4 carriers/ 3 sections. 0~50 channel per section

Multiple Access Methods