cdma system configuration !. system architecture mscvlrbscbts msceiriwf hlrsc esme ms vlr a b cd e...
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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
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