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Lecture: 04
Engineer ASAD MEHMOOD
ContentsContents
• ZXC10-BTSB Solution • ZXC10-BTSB AE
• BDS• RFS• PWS
ZTE BSSB BTS SolutionsZTE BSSB BTS Solutions• ZTE BTS consists of three subsystems
Baseband Digital Subsystem (BDS) Radio Frequency Subsystem (RFS) Power Subsystem (PWS)
• Different types of BTSs are implemented by distinct BDS or RFS. • I1 BTS = all-IP BDS + all-IP RFS
• I2 BTS = all-IP BDS + local HIRS RFS/remote RFS
• AE BTS = (HIRS + all-IP) BDS + HIRS RFS
• CBTS = all-IP BDS + all-IP RFS
ZTE BSSB BTS Solutions (Cont’d)ZTE BSSB BTS Solutions (Cont’d)ZXC10-BTSB I1 ZXC10-BTSB AE
BDS
RFS
BDS
RFS
ContentsContents
• ZXC10-BTSB Solution• ZXC10-BTSB AE
• BDS of ZXC10-BTS• RFS of ZXC10-BTS• PWS of ZXC10-BTS
BTSB AE featuresBTSB AE features• Composed of mixed HIRS+IP BDS and usually local
HIRS RFS. • Supporting at most 12 carrier sectors with two racks.• Compatible with both ZXC10-BSCB (all-IP) and ZXC10-
BSC (HIRS).• No GCM in the BDS so that Time Frequency
Subsystem (TFS) is provided in RFS for system clock and frequency generation, which includes GPSTM, FDM and TCM.
• SIM is required for transferring clock from HIRS part to IP part.
ZXC10-BTSB AE Subsystem Main ZXC10-BTSB AE Subsystem Main ContentContent
• BDS (Baseband Digital Subsystem)• TFS (Timing Frequency Subsystem)• RFS (Radio Frequency Subsystem)• PS (Power Subsystem)
Typical BDS Configuration of AETypical BDS Configuration of AE
CHM
RIM
CHM
CCM
CCM
AE BDS IP
DSM
SNM
SAM
SIM
PSMB
CHM
RIM
CHM
CHM
CCM
CCM
AE BDS IP+HIRS
DSM
SNM
SAM
SIM
RFIM
CHM
CCM
CCM
CDSU
CHM
RFIM
CHM
PSMB
PSMB
CHM
AE BDS HIRS
SAM
RFI
M
CHM
CCM
CCM
CDSU
CHM
RFI
M
CHM
PSMB
PSMB
BDS (Baseband Digital Subsystem)BDS (Baseband Digital Subsystem)
One EBDS consists of up to 4channel processing modules (CHMs), 2
communication control modules (CCM), 1 RF interface modules
(RFIM) and 1 BTS_CDSU module.
HIRS-Baseband Digital SubsystemHIRS-Baseband Digital Subsystem
Baseband Digital SubsystemBaseband Digital Subsystem• Main functions of the EBDS--HIRS
• CDMA Baseband digital data forward modulation• CDMA Baseband digital data reverse demodulation• Interface with RFS• Provide Abis Interface to BSC• control center of BTS, communication platform
• In logic, EBDS subsystem includes CCM module, CHM module and RFIM module. For the description convenience, CDSU module is described in EBDS subsystem.
Baseband Digital Subsystem-Logical StructureBaseband Digital Subsystem-Logical Structure
CCM2:1
CHM1
CHM2
CHM12. . . . . .CHM
3RFIM
2:1
C DS U
C DS U
BSC
E1CO
DI S
. . ..
TCM
G P S
I 2C
FDM
RFCM6:1
TOD 10M 16CHI P PP2S、 、
PP2S
16CHI P
10M
CDMA前 反 向数 字 基 带 数 据
BDSRS232
R FSCDMA前 反 向
模 拟 基 带 数 据
12M
CDMA Baseband Data
CCM(Communication Control module)CCM(Communication Control module)
• Main Functions:• Centralized control for data signaling route, signaling
handling, resource management and maintenance operation of whole EBDS subsystem.• Provide S_HIRS functions, served as a switching unit• Signaling processing and transfer• Maintenance and Management of modules on EBDS
Subsystem• Software downloading and data distribution• Maintenance of GPSTM, Receive the TOD message
CHM Channel Element ModuleCHM Channel Element Module
• CHM, located in the EBDS frame of ZXC10-BTS, is responsible for modulation/demodulation of the channels in CDMA. A single frame has 6 CHM modules per carrier.
• CHM implements the following functions: • In Forward link: CHM modulates voice or data frames which sent by
CCM board via transceiving interface.And then it sends the modulated signals to RFIM board.
• In Reverse link: CHM receive antenna signals which distributed by RFIM via the baseband data interface, and then it demodulates the signals into voice or data frames and sends them to CCM board for switching processing via transceiving interface
• CE is in CSM chip, each CHM include 1 or 2 CSM5000 chipset
CHMCHM Channel Element Module Channel Element Module
• 1 to 4 CSM5k chips in CHM5K for 1x, 1 chip include 64 F_CE and 32 R_CE. In 64 F_CE: 36 for voice and the left 28 for data.
X2
X1
X3
X4
X8
S1
X6
1
CSM5K
RFIM(Radio Frequency Interface Module)RFIM(Radio Frequency Interface Module)
• RFIM Functions:• RFIM is connected with EBDS and RFS. It is controlled
by CCM.• RFIM transmits and processes forward and reverse
baseband data, TRX control signaling information (configuration control and status alarm).
• Clock distribution :It receives 16Chip clock and PP2S from GPS unit ,and then distributes the clock to channel boards
SAM (Site Alarm Module)SAM (Site Alarm Module)
• For any large communication equipment, a perfect alarm system is indispensable. It must monitor the working environment of the communication equipment in real time and give a prompt response to any fault and alarm signal for timely processing and avoiding loss.• Detect the running status of the power module and fans• Environment signals such as door control, flooding,
temperature, humidity, smoke etc., • Reports the detection results to the operation and maintenance
console through the CCM for processing.
ZXC10-BTSB AE Subsystem Main ContentZXC10-BTSB AE Subsystem Main Content
• EBDS (Baseband Digital Subsystem)• TFS (Timing Frequency Subsystem)• RFS (Radio Frequency Subsystem)• PS (Power Subsystem)
FDM Frequency Distribution ModuleFDM Frequency Distribution Module• The FDM board implements the following functions:
• Receives clock signals from TCM.• Distributes 10MHz signals or distributes them after phase-
lock.• Reports the working status of this board through IIC.
FD
M M
odule
10MHz
TRX1TRX2
TRX3
TRX4TRX5TRX6
ZXC10-BTSB AE Subsystem Main ContentZXC10-BTSB AE Subsystem Main Content
• EBDS (Baseband Digital Subsystem)• TFS (Timing Frequency Subsystem)• RFS (Radio Frequency Subsystem)• PS (Power Subsystem)
RFS StructureRFS Structure
• RFS mainly enables air interface via antenna. It supports the interface with EBDS via the interface module to implement modulation transmission and demodulation receiving of CDMA signals. It also implements relative check, monitoring, configuration and control functions.
-
RF transceiver
TRX Antenna feeder system
HPARF front End
RFE
BTS test
BTM
TRX Transmitter and Receiver ModuleTRX Transmitter and Receiver Module
In TRX, two receiving interface, RX1 and RX0, are used for diversity receiving.
TRX Front PanelTRX Front PanelRUN
ALM
TRX
TX
RST
RX1
RX2
RS232
RUN Green RUN indicator.
ON: normal running (B version)Flash: normal running (C version)OFF: power-off or faulty
ALM
Red Fault indicator.
ON: any error occursFlash: IIC fault OFF: normal running or power-off
RST Reset button. used to reset a board.
RST Reset button.When this button is pressed down, a board will be reset
TX Forward transmitting signals sent by TRX
RF IN input end of HPA
SMA RF cable
RX1 Backward receive signals of RFE
RX output end of RFE
SMA RF cable
RX2 Backward receive signals of RFE
RX output end of RFE
SMA RF cable
RS232 Test interface None None RS232 line of DB9
RFCM FunctionsRFCM Functions
• Located in the TRX Module• The data interface between the baseband
digital subsystem (RFIM) and the RF subsystem (TRX)
• D/A-A/D conversion
Attention: RFCM is inside TRX can not be seen
HPA(High Power Amplifier ModuleHPA(High Power Amplifier Module
HPA FunctionsHPA Functions• HPA performs power amplification for the
TRX forward transmission signals. • When HPA receives the forward
transmitted CDMA signals of TRX , it will amplify the power, so that the signals will radiate within the cell via the antenna after they are processed by the duplex filter of the RF front end with proper signal power to cover the planned cellular area.
RFE(Radio Front End) ModuleRFE(Radio Front End) Module
DUP: Duplexer (Receive and Transmit)DIV: Diversity (Receiving)
RFE-DIV RFE-DIV
RFE Module FunctionRFE Module Function• RFE is the bridge between the internal system of
RFS in the BTS and the external antenna of the BTS • Main Functions:
• It implements filtering and low noise amplification on small signals received by the antenna
• It implements power allocation on received signals after low noise amplification
• It provides receiving/transmission duplexing function (only for DUP)
• Performs power monitoring, providing related power detection values
ZXC10-BTSB AE Subsystem Main ContentZXC10-BTSB AE Subsystem Main Content
• EBDS (Baseband Digital Subsystem)• TFS (Timing Frequency Subsystem)• RFS (Radio Frequency Subsystem)• PS (Power Subsystem)
• PSMD: Power Distribute Module• PSMD is located in BTS system power distribution box. It distributes the
input • -48V DC power into shelves. PSMD board checks and controls the
working states• of power system and fan. • PSMC: ±12V:Provide Power for REF&TRX&FDM• PSMB: +5V:Provide Power for EBDS• PPM: +27V:Provide Power for HPA
Typical BTSB AE and ItsTypical BTSB AE and Its Principle Principle
RFE(Alpha)
TRX
RFCM
EBDS
HPA
TRX
RFCM
HPA
TRX
RFCM
HPA
TX
TX
TX
RFE(Beta)
RFE(Gamma)
RX0
RX1
RX0
RX1
RX0
RX1