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Internal
OME201102 HUAWEI BTS3012
Hardware Structure
ISSUE 1.5
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Upon completion of this course, you will be able to:
Know the functions and features of BTS
Master the BTS hardware structure
Master the cable connection of BTS
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References
BTS3012 Technical Manual
BTS3012 Installation Manual
BTS3012 User Manual
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Location
MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller
HLR: Home Location Register AUC: Authentication Center EIR: Equipment Identity Register
MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center
VM: Voice Mailbox OMC: Operation and Maintenance Center
PSTN
ISDN
PSPDN
Um Interface
BTS3012
BTS3012
BTS3012
BTS3012
OMC
HLR/AUC/EIR
BSC
MSC/VLR
SMC/VM
A Interface
MAP
TUP,ISUPMS
MS
MS
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Features and Functions
Support GSM800M850M900M1800M1900M
Support networking topology includes star, tree, chain and ring
Support A5/1 and A5/2 encryption/decryption
Support GPRS and EDGE
Support dynamic and static power control
Support the omni-directional coverage and directional coverage
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Features and Functions
Double Transceiver Unit (DTRU). A single cabinet can support
up to 12 carriers. It can smoothly evolve into WCDMA
Transmit diversity, 4-receive diversity
Support Power Boost Technology (PBT)
BTS3012 can share cabinet with WCDMA base station. The
module of WCDMA base station can be inserted in the
BTS3012 cabinet
Support more various transmission mode includes E1, STM-1,
microwave, and satellite transmission
The DTRU of the BTS3012 can be inserted into
BTS30/BTS312 with -48V DC power supply
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Chapter 1 Overview
Chapter 2 System Components
Chapter 3 Signal Processing
Chapter 4 Antenna and Feeder System
Chapter 5 Typical Configuration
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Hardware structure
TMA TMA
DTRU DAFU
Antenna and feeder
subsystemForepart of RF
Subsystem
TMA TMA
DTRU DAFU
TMA TMA
DTRU DAFU
Double transceiver
subsystem
DATU
Um Interface
DATU
fiber
E1
Abis Interface
Common subsystem
NFCB
Metro 100
DTMU
DEMU
E1
BITSMonitor
TBUS/DBUS/CBUS
MS
FH_BUS
Extension
cabinet
DBUS/TBUS
CBUS
CBUS3
CBUS3
CBUS3
CBUS3
CBUS2
CBUS2
CBUS2
CBUS3
CBUS3
Pro
tectionforsignal
Electric tilt antenna & TMA feed
Electric tilt antenna & TMA feed
Electric tilt antenna &TMA feedCBUS3
FH_BUS
FH_BUS
RF signal
RF signal
RF signal
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BTS3012 Cabinet and Boards
Abbreviations DescriptionDTRU Double Transceiver Unit
DTMU Transmission & Timing & Management Unit for DTRU BTS
DCCU Cable Connection Unit for DTRU BTS
DAFU Antenna Front-end Unit for DTRU BTS
DDPU Dual Duplexer Unit for DTRU BTSDCOM Combining Unit for DTRU BTS
DATU Antenna and TMA Control Unit for DTRU BTS
DMLC Monitor Signal Lightning-Protection Card for DTRU BTS
DELC E1 Signal Lightning-Protection Card for DTRU BTS
DSAC Signal Access Card for DTRU BTS
DCSU Combined cabinet Signal connection Unit for DTRU BTS
DEMU Environment Monitoring Unit for DTRU BTS
DCTB Cabinet Top Backplane for DTRU BTS
FAN Box NodeB Fan Controlling and monitoring Board
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
D
DPU
DCOM
DCOM
DDPU
DCOM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
ML
C
Power and
E MC
Transmission Unit
DDPU
EL
C
EL
C
SA
C
Transmission Unit
DTM
U
DTM
U
DEM
U
D
C
CU
D
C
SU
D
A
TU
Double
transceiver
subsystem
Common
Subsystem
AntennaFront-Endof the RF Subsystem
(DAFU)
Cabinet Top Access
Subsystem (DCTB)
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
D
DPU
DCOM
DCOM
DDPU
DCOM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
MLC
Power andE MC
Transmission Unit
DDPU
ELC
ELC
SAC
Transmission Unit
DTM
U
DTM
U
DEM
U
D
C
CU
D
C
SU
D
A
TU
Double
transceiver
subsystem
Common
Subsystem
AntennaFront-Endof the RF Subsystem
(DAFU)
Cabinet Top Access
Subsystem (DCTB)
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Common Subsystem
DTMU Transmission timing& management unit for DTRU BTS
DEMU Environment Monitoring Unit for DTRU BTS
DCSU Combined cabinet Signal connection Unit for DTRU BTS
DCCU Cable Connection Unit for DTRU BTS
DATU Antenna and TMA control unit for DTRU BTS
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Functions of DTMU
Providing the external GPS input, the BITS synchronized clock input
Providing 4-route or 8-route E1 inputbackup between the active and
standby boards
Providing local MMI maintenance of the 10 M network port
Controlling, maintaining, and operating the BTS
Providing fault management, configuration management, performance
management, and security management
Supporting 8-route digital alarm input. Two routes are lightning arrester
failure alarm detection
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Structure of DTMU
MCK
OML
DBUS
CBUS2
Clock
BIUDTRU
DTMU
BSC
MCUMMI
LMT
Abis
External
synchronized clock
Subrack number
and clock
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Indicators on DTMU
Indicator Color Description Status Meaning
RUN Green Indicates
operation
Slow flash (0.25 Hz) OML is blocked
Slow flash (0.5 Hz) Normal
Fast flash at uncertain
intervals
BSC data loading
Off Power failure of the board
ACT Green Indicates
whether the
board is
active or
standby
Off Standby
On Active
PLL Green Indicates theclock status
Off Abnormal
On Free-run
Fast flash (4 Hz) Pull-in
Fast flash (1 Hz) Lock
LIU1 Green Indicates the
transmissionstatus of E1
port 1 and
port 5
Off E1 port 1 is normal when SWT is out
E1 port 5 is normal when SWT is onOn E1 port 1 near end alarm occurs when SWT is out
E1 port 5 near end alarm occurs when SWT is on
Fast flash (4 Hz) E1 port 1 remote end alarm occurs when SWT is out
E1 port 5 remote end alarm occurs when SWT is on
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
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Indicator Color Description Status Meaning
LIU2 Green Indicates the
transmission status of
E1 port 2 and port 6
Off E1 port 2 is normal when SWT is out
E1 port 6 is normal when SWT is on
On E1 port 2 near end alarm occurs when SWT is out
E1 port 6 near end alarm occurs when SWT is on
Fast flash (4Hz)
E1 port 2 remote end alarm occurs when SWT is outE1 port 6 remote end alarm occurs when SWT is on
LIU3 Green Indicates the
transmission status of
E1 port 3 and port 7
Off E1 port 3 is normal when SWT is out
E1 port 7 is normal when SWT is on
On E1 port 3 near end alarm occurs when SWT is outE1 port 7 near end alarm occurs when SWT is on
Fast flash (4
Hz)
E1 port 3 remote end alarm occurs when SWT is out
E1 port 7 remote end alarm occurs when SWT is on
LIU4 Green Indicates the
transmission status of
E1 port 4 and port 8
Off E1 port 4 is normal when SWT is out
E1 port 8 is normal when SWT is on
On E1 port 4 near end alarm occurs when SWT is out
E1 port 8 near end alarm occurs when SWT is on
Fast flash (4
Hz)
E1 port 4 remote end alarm occurs when SWT is out
E1 port 8 remote end alarm occurs when SWT is onSWT Green Indicates handover
status of E1
Off LIU1 to LIU4 indicate the transmission status of E1 port
1 to 4.
On LIU1 to LIU4 indicate the transmission status of E1 port
5 to 8.
ALM Red Alarm indicators Off No hardware alarm
On Hardware alarm
Indicators on DTMU
RUN
ACT
PLL
LIU1
LIU2
LIU3
LIU4
SWT
ALM
RST
MMI
T2M
FCLK
T13M
DTMU
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Interface on the DTMU panel
Interface Type Description
T2M SMB (female) Outputs reference testing clock
FCLK SMB (female) 216.7 Hz frame clock
T13M SMB (female) 13M primary reference clock
MMI RJ45 Near end maintenance network port
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Functions of DEMU
The DEMU is placed in slots 2 to 4 and slot 7 of the common subrack with
the DATU. The DEMU is an optional module. There is maximum one
DEMU under full configuration.
Monitoring variations in the smoke, water, temperature, humidity, infrared,
and access control ,Handling alarms
Guaranteeing normal operation of the equipment
Output of 6-route Boolean value and input of 32-route main node alarms
DMLC DEMU
CBUS3Monitor signal
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Functions of DCSU
The Combined Cabinet Signal
Connection Unit for DTRU BTS
(DCSU) is placed in slot 5 of the
common subrack, which is
located in the lower part of thecabinet. There is only one DCSU
and it is mandatory
The DCSU transfers signals for
the combined cabinet and cabinet
group between the common
subrack and the cabinet top
subrack
DCMB
DTMU
DCSU
DTRB
DCTB
DCCU
DEMU
DATU
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The interfaces on the DCSU panel
CC_IN
CC_OUT
TO_DTRB
TOP2
DCSU
Silk- Screen Type Description
CC_OUT MD64 (female) For cable output from the combined cabinet
CC_IN MD64 (female) For cable input to the combined cabinet
To_DTRB MD64 (female) Connecting to the DTRB through cables
TOP2 DB26 (female)Connecting to the cabinet top subrack through
cables
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GM51DCSU VERBSW6
SW9
SW14
SW13
SW12
SW7
SW10
SW8
SW5
SW4
SW3
SW11
SW2
SW1
Switch of DCSU
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Functions of DCCU
The DCCU is placed in slot 6 of
the common subrack. There is
only one DCCU and it is
mandatory
Converting the input and output
signals of the common subrack.
Inputting the power of the
common subrack
Providing EMI filtering
DCMB
DTMU
DCCU
NFCB
DCTB
DCSU
DEMU
DATU
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The interfaces on the DCCU panel
POWER
DCCU
To_FAN
TO_TOP1
TRAN
Silk-
ScreenType Description
TRANMD64
(female)For E1 signal input
To_FANDB26
(female)
Connects to the fan panel through cables
TO_TOP1MD64
(female)
Connects to the cabinet top subrack through
cables
POWER 3V3 For power input of the common unit
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Functions of DATU
The DATU is placed in slots 2 to 4 and slot 7 of the
common subrack with the DEMU. It is optional and
there are maximum two DATUs
Transmitting the remote electrical tilt unit (RET)
control signals
Feeding the TMA
Communicating with the DTMU through CBUS3 for
control and alarm report
DATU
RUN
ACT
ALM
ANT0
ANT1
ANT2
ANT3
ANT4
ANT5
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
D
DPU
DCOM
DCOM
DDPU
DCOM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
MLC
Power andE MC
Transmission Unit
DDPU
ELC
ELC
SAC
Transmission Unit
DTM
U
DTM
U
DEM
U
D
C
CU
D
C
SU
D
A
TU
Double
transceiver
subsystem
Common
Subsystem
AntennaFront-Endof the RF Subsystem
(DAFU)
Cabinet Top Access
Subsystem (DCTB)
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Cabinet Top Access Subsystem
DMLC( Monitor Signal Lightning-Protection Card for DTRU BTS)
DELC(E1 Signal Lightning-Protection Card for DTRU BTS)
DSAC(Signal Access Card for DTRU BTS)
D
M
L
C
D
E
L
C
D
E
L
C
D
S
A
C
DCF
CKB2
CKB1
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Function of DMLC
The DMLC is placed in slots 0 to 2 of the cabinet top
subrack with the DELC. There is only one DMLC and
it is optional DMLC
Thirty-two-route Boolean value input
Six-route Boolean value output
Four-route analog input
Smoke/water/access
control/infrared/humidity/temperature sensor signal
input
SWIN
SWOUT
DMLC
AIN
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Function of DELC
The DELC is placed in slots 0 to 2 of the cabinet
top subrack with the DMLC
The DELC is mandatory and there is one DELC
under minimum configuration
Without the DMLC, there are maximum three
DELCs, supporting up to 12 routes of protected E1
signals
DELC
TR
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Function of DSAC
The DSAC is placed in slot 3 of the cabinet top
subrack. There is only one DSAC and it is mandatory
Six-route Boolean value input.
Two-route CBUS3 output
Two-route input of lightning protection arrester failure
alarm
Access protection of BITS clock input
DSAC
COM1
EAC
SYNC
COM2
S1+S1-S2+S2-
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
D
DPU
DCOM
DCOM
DDPU
DCOM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
MLC
Power andE MC
Transmission Unit
DDPU
ELC
ELC
SAC
Transmission Unit
DTM
U
DTM
U
DEM
U
DC
CU
DC
SU
DA
TU
Double
transceiver
subsystem
Common
Subsystem
AntennaFront-Endof the RF Subsystem
(DAFU)
Cabinet Top Access
Subsystem (DCTB)
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Double transceiver subsystem
DTRUDouble Transceiver Unit
DTRB
DTRB
DTRU
DTRU
DTRU
DTRU
DTRU
DTRU
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Functions of DTRU
RF subsystem transmit part. Converts the baseband signals on the two
TRXs to the RF signals. Supports up-frequency conversion of the signals
and RF frequency hopping.Filters, amplifies, and outputs the combined
signals
RF subsystem receive part. Divides and modulates the RF signals on thetwo TRXs. Supports transmit receive and RF frequency hopping
Baseband processing part. Processes signals. Supports coding and
decoding, interleaving and de-interleaving, modulation and demodulation.
Supports voice fax services. Supports data services in Phase II, GPRS
services, and EDGE services. Supports transmit diversity and 4-way
receive diversity. Amplifies the output power
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Functional structure of DTRU
DTRU Baseband and RF Unit (DBRU)
DTRU Power Amplifier Unit (DPAU)
DTRU Power Supply Unit (DTPS)
DTMU
DTPS
DTRU
- 48V DC
DPAU
DBRU
DAFU
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Indicators on DTRU
Indicator Color Description Status Meaning
RUN Green Indicates the running
and power-on of the
DTRU
On There is power supply or the board is faulty.
Off There is no power supply and the board is
faulty.
Slow flash (0.25
Hz)
The board is starting.
Slow flash (0.5 Hz) The board is running.
Fast flash (2.5 Hz) The DTMU is sending configuraiton
parameters to the DTRU.
ACT Green Indicates the TRX isworking
On The board is running (the DTMU sendsconfiguration parameters to the DTRU
correctly and the cell is starting). All the
channels on the two carriers can work
normally.
Off Communication between DTRU and DTMU is
not set up
Slow flash (0.5Hz) Only parts of the logic channels are working
normally (including after TRX mutual aid).
ALM Red Indicates alarm On (includinghigh-frequency
flash)
Critical alarm occurs to the board.
Off The board is normal.
RF_IND Red RF interface
indicators
On Standing wave alarm
Off Normal
Slow flash (0.5 Hz) RL alarm
DTRU
TX1
IN1
TCOM
IN2
TX2
RST
RUN
ACT
ALM
RF_IND
PWR
RXM1
RXD1
RXM2
RXD2
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Indicators on DTRU
Interface Type Description
TX1 N (male) TX1 output signals:
Output to the forepart of the RF when not in combiner
Output to IN1 in combiner
IN1 SMA (female) Connects to TX1 in combiner
TCOM N (male) Combines and outputs IN1 and IN2 or implements PBT combined
outputIN2 SMA (female) Connects to TX2 in combiner
TX2 N (male) TX2 output signals:
Output to the forepart of the RF when not in combiner
Output to IN2 in combiner
RXM1 SMA (female) Main or diversity 1 receive port of carrier 1
RXD1 SMA (female) Diversity 1 or 2 receive port of carrier 1
RXM2 SMA (female) Main receive port of carrier 2 or Diversity 3 receive port of carrier 1
RXD2 SMA (female) Diversity receive port of carrier 2 or Diversity 4 receive port of
carrier 1
PWR 3V3 Power supply
DTRU
TX1
IN1
TCOM
IN2
TX2
RST
RUN
ACT
ALM
RF_IND
PWR
RXM1
RXD1
RXM2
RXD2
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DTRU transmit mode
Transmit independence
Transmit diversity
PBT
Wideband transmit combination
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DTRU transmit mode-transmit independence
TCOM
TRX0
TX
TRX1
TX
TX1
IN1
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combiner
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DTRU transmit mode-transmit diversity
TRX1
TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Man made multi way
combiner
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DTRU transmit mode-PBT
TRX1
TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
Same phase
combiner
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DTRU transmit mode-wideband transmit combination
TRX0
TX
TRX1
TX
TX1
IN1
TCOM
IN2
TX2
combiner
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DTRU receive mode
Receive independence
Receive diversity
4-way receive diversity
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DTRU receive mode- Receive independence
TRX1
TRX0
TX
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
divider
combiner
divider
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DTRU receive mode- Receive diversity
TRX0
TX
TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combiner
divider
divider
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DTRU receive mode- 4-way receive diversity
TRX0
TX
TRX1
TX
divider
divider
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combiner
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Intra structure of DTRU
TRX0
TX
TRX1
TX
TX1
IN1
TCOM
IN2
TX2
RXM1
RXD1
RXM2
RXD2
combiner
divider
divider
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Functions of DTRB
The DTRB is placed in the DTRU
subrack. It has six slots, each
holding one DTRU
The DTRB provides connections
between the DCSU and the DTRU.All the onsite signals are provided to
the DCSU through the DTRB
DTRB
DTRU
DTRU
DTRU
DTRU
DTRU
DTRU
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BTS3012 Cabinet and BoardsD D D D
Wiring & Air Inlet
Wiring
D
DPU
DCOM
DCOM
DDPU
DCOM
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
D
TRU
Wiring
FAN
Air Inlet
MLC
Power andE MC
Transmission Unit
DDPU
ELC
ELC
SAC
Transmission Unit
DTM
U
DTM
U
DEM
U
DC
CU
DC
SU
DA
TU
Double
transceiver
subsystem
Common
Subsystem
AntennaFront-Endof the RF Subsystem
(DAFU)
Cabinet Top Access
Subsystem (DCTB)
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Front-End of the RF Subsystem
DDPU (Dual Duplexer Unit for DTRU BTS)
DCOM (Combining Unit for DTRU BTS)
NBBI
D
C
O
M
D
D
P
U
D
C
O
M
D
D
P
U
D
C
O
M
D
D
P
U
1 2 3 4 50
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Functions of DDPU
The DDPU is intermixed with the DCOM in the DAFU subrack
of the forepart of RF subsystem. It is indispensable. Generally,
the number of DDPU is one at least and three at most. Without
the DCOM, there can be at most six DDPUs
Sending multi RF signals from the transceiver in the DTRU tothe antenna through the duplexer
Sending signals from the antenna after amplifying and
quartering them to the transceiver in the DTRU
Detecting standing wave alarms in the Antenna Feeder system Receiving the gain control of the low noise amplifier
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Functional structure of the DDPU
ANTB
TXA
TXB
RXA4
duplexer divider duplexer divider
ANTA
RXA1
RXA2RXA3
RXB1RXB2RXB3RXB4
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Indicators on DDPU
Indicator Color Description Status Meaning
RUN Green Indicates the DDPU is
running and powerd on
On There is power supply and the board is faulty.
Off There is no power supply or the board isfaulty.
Slow flash (0.5 Hz) The board is running normally.
Fast flash (2.5 Hz) The DTMU is sending configuration
parameters to the DDPU or the DDPU isloading software programs.
ALM Red Indicates an alarm On (including high-frequency flash)
There is alarm(including standing wave alarm)and the board is faulty.
Off No fault
Slow flash (0.5 Hz) The board is starting or loading the newest
application programs
VSWRA Red Indicates a standing
wave alarm of ChannelA
Slow flash (0.5 Hz) Standing wave alarm occurs to Channel A
On Standing wave critical alarm occurs to
Channel A
Off No standing wave alarm occurs to Channel A
VSWRB Red Indicates a standing
wave alarm of Channel
B
Slow flash (0.5 Hz) Standing wave alarm occurs to Channel B
On Standing wave critical alarm occurs to
Channel B
Off No standing wave alarm occur to Channel B
RUN
ALM
VSWRA
RXA1
RXA2
RXA3RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
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Interface on DDPU
Interface Type DescriptionCOM DB26
(female)
Sends to the DDPU control signals, communication signals,
clock signals and subrack number
POWER 3V3 Power supply input
TXA N (male) Input of the TX signals sent from the DTRU
Input of the DCOM combining signals
TXB N (male) Input of the TX signals sent from the DTRU
Input of the DCOM combining signals
RXA1 SMA (female) Main 1 output port
RXA2 SMA (female) Main 2 output port
RXA3 SMA (female) Main 3 output port
RXA4 SMA (female) Main 4 output port
RXB1 SMA (female) Diversity 1 output port
RXB2 SMA (female) Diversity 2 output portRXB3 SMA (female) Diversity 3 output port
RXB4 SMA (female) Diversity 4 output port
ANTA DIN (female) RF jumper port
ANTB DIN (female) RF jumper port
RUN
ALM
VSWRA
RXA1
RXA2
RXA3RXA4
RXB1
RXB2
RXB3
RXB4
DDPU
TXA
TXB
COM
POWER
VSWRB
ANTA
ANTB
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Functions of DCOM
The DCOM is placed in the DAFU subrack
with the DDPU
The DCOM is optional and there are a
maximum three DCOMs. The DTRU
combines two carriers into one channel. TheDCOM is required when the DTRUs are
insufficent
The DCOM combines the 2-route DTRU
transmission signals and outputs them to the
DDPU
DCOM
TX-COM
TX2
TX1
ONSHELL
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Interfaces on DCOM
Interface Type Description
ONSHEL
L
DB26
(female)
For identification of the board type of DCOM
and on-site status
TX
COM
N (male) Output of combining signals from the DCOM
to DDPU
TX1 N (male) TX signal input from the DTRU to DCOM
TX2 N (male) TX signal input from the DTRU to DCOM
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Functions of FAN BOX
The FAN BOX forms a loop with the air inlet box to provide forcedventilation and dissipation for the common subrack, the DTRU subrack,
and the DAFU subrack
The FAN Box is mandatory with four independent axial flow fans. The
fans' speed and running status are controlled by the Fan Controlling and
Monitoring Board
FANSTATE
COMPWR
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Indicators on FAN BOX
Indicator Color Status Meaning
STATE Green Fast flash (4 Hz) Communication between the NFCB
and the DTMU is abnormal. There is
no alarm
Red Fast flash (4 Hz) Alarm occurs to the board
Green Slow flash (0.5
Hz)
The board is running normally
Orange (red
and green)
On The board software is being down
graded
Green or red or
orange
Off There is no power supply and the
board is faulty
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Chapter 1 Overview
Chapter 2 System Components
Chapter 3 Signal Processing
Chapter 4 Antenna and Feeder System
Chapter 5 Typical Configuration
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System Signal Flow
the signal flow of the service and signaling include
DL Signal Flow
UL Signal Flow
Signaling Processing Signal Flow
Clock Signal Flow
Combined Cabinet Signal Flow
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DL Signal Flow
D
D
P
U
Um
BSC
BTS3012 Cabinet
MSAntennaFeeder
Abis
D
T
R
U
DT
M
U
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DL Signal Flow
The DL signal flow includes the following steps:
The DTMU receives the service data from the BSC, exchanges
and processes it, and then transfers it to the DTRU
The DTRU performs digital filtering, up conversion, and filter
amplification of the signals and sends the signals to the DDPU
The duplexer in the DDPU filters the signals sent from the DTRU
and transmits the signals through antennas and feeders
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UL Signal Flow
D
A
F
U
Um
BSC
BTS3012 Cabinet
MSAntennaFeeder
Abis
D
T
R
U
DT
M
U
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UL Signal Flow
The UL signal flow includes the following steps:
The antenna receives the signals transmitted from the MS. After being
amplified by the TMA, the signals are transmitted to the DDPU through
the feeder. The TMA is optional. It is used to compensate the feeder
loss and enhance receiver sensitivity of the DDPU antenna port
The DDPU receives the signals and transmits the signals to the DTRU
after they are filtered by the duplexer and amplified by the LNA
The DTRU receives the signals and transmits the signals to the DTMU
after amplification and down conversion. The DTMU then transmits the
signals to the BSC through the Abis interface
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Signaling Processing Signal Flow
BTS3012
DDPUDTRUDTMU
BSCAbis
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Signaling Processing Signal Flow
The signaling processing signal flow includes the following steps:
The Abis interface board receives the signaling data from the BSC
and transmits the data to the DTMU
The DTMU performs decision and processing on the signaling and
transmits the signaling to the DTRU and DDPU
The DTRU and DDPU report board status to the DTMU
The DTMU obtains the status of the BTS3012 by collecting and
analyzing the status of all boards and transmits the information to
the BSC through the Abis interface
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Clock Signal Flow
DTMUBoards in main
cabinet
Boards in slave
cabinet
A-bis
Clock distributioncable between
cabinets
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Clock Signal Flow Description
The clock signal flow includes the following steps:
The external reference clock is transmitted to the clock
module in the DTMU through the Abis interface
The clock module performs phase lock and frequency
division on the clock signals to generate different clocksignals for BTSs
The clock signals are transmitted to the modules in the
main cabinet such as the DTRU and the DDPU
The clock signals are transmitted to the modules in theslave cabinets through the clock distribution cable
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Chapter 1 Overview
Chapter 2 System Components
Chapter 3 Signal Processing
Chapter 4 Antenna and Feeder System
Chapter 5 Typical Configuration
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Antenna Feeder subsystem
Antenna
TMA
Antenna
support
Jumper
Jumper
Feeder
Jumper
Antenna
Feeder
Jumpers
TMA
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Antenna
In mobile communications systems, the antenna consists of an
array of element antennas, as shown in Figure
Element
antenna
Feeding
network
Antenna
connector
Directional antenna Omnidirectional antenna
Feeding
network
Element
antenna
Feeding
network
Antenna
connector
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Antenna
BTS3012 antennas are classified:
By radiation features in horizontal directions: omnidirectional
antennas and directional antennas
By polarization features: single polarization antennas and dual
polarization antennas
Omnidirectional
antennaSingle polarization
antenna
Dual polarization
antenna
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Lightning Arrester is used to
prevent the equipment from being
damaged by the lightening current
inducted by the core line of the
feeder
feeder
jumper
Lightning Arrester
Lightning Arrester
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Types of Main Feeder
7/8 inch
Cable loss=0.043dB/m
5/4 inch
Cable loss=0.032dB/m
1/2 inch jumper
Cable loss=0.11dB/m
Used between the antenna and the main feeder
Between the antenna and the tower-top amplifier
Between the cabinet and the lightning arrester
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TMA
The tower mounted amplifier (TMA) is a low noise amplification module
installed on the tower top. The TMA is optional. The triplex TMA is usually
used and installed close to the antenna. The triplex TMA consists of triplex
filter, low noise amplification, and feeder
Lower
noiseamplific-ation
Sending
filter
Receivingfilter
Bypass
DC
BTS
TMA
Feeder
Receivingfilter
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Polarization
Two main types of polarization
Vertical polarization
Horizontal polarization
The types of antenna divided by
polarization
Single polarized antenna
Vertical polarization for GSM
One port for one feeder
Dual polarized antenna
+45 degree and -45 degree
Two ports for two feeders
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Chapter 1 Overview
Chapter 2 System Components
Chapter 3 Signal Processing
Chapter 4 Antenna and Feeder System
Chapter 5 Typical Configuration
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Configuration Principles
The configuration principles of the BTS3012 cabinet are as follows:
The minimum antenna rule
use as few as possible antennas for cell configuration.
The minimum cabinet rule
use as few as possible cabinets for cell configuration.
The complete synchronous cell rule
all TRXs of a synchronous cell are configured in the same cabinet group
The basic cabinet priority rule
TRXs are configured in the basic cabinet in preference, and the numberof TRXs in the basic cabinet is not less than that in any extension cabinet
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Configuration Principles
The BTS3012 supports the omnidirectional coverage and the directional
coverage.
The BTS3012 supports the combination of two cabinets to form one group
and the combination of three cabinet groups.
The BTS3012 supports the transmit diversity and 4-way diversity receive.
The DCOM combines two carriers into one channel (the two-into-one
function). The DCOM is required when the DTRUs are not sufficient.
The BTS3012 uses DTRU. One single cabinet supports up to 12 TRXs in
full configuration.
The maximum number of carriers is eight in a cell with a pair of dual
polarization antennas or two omnidirectional antennas of a single
sectorized cell
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Typical configuration S1/1/1
transmit diversity mode
S1/1/1 transmit independence mode
each cell is configured one DTRU and
one DDPU
The connection for one cell is showed in
the right slide BSC data configuration should be
transmit diversity mode
receive independence mode
Cabinet Top powerdBm
46 or 47.8-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical configuration S1/1/1
transmit diversity / 4-way receive diversity
S1/1/1 transmit diversity / 4-way receive
modeeach cell is configured one
DTRU and two DDPU
BSC data configuration should be
transmit diversity mode
4-way receive mode
Cabinet Top powerdBm
46 or 47.8-1.0
DTRU
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical configurationS2/2/2
transmit independence mode
S2/2/2 transmit independence modeeach
cell is configured one DTRU and one DDPU
The connection for one cell is showed in the
right slide
BSC data configuration should be
transmit independence mode
receive diversity mode
Cabinet Top powerdBm
46 or 47.8-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical configurationS2/2/2
PBT mode
S2/2/2 PBT modeeach cell is
configured two DTRU and one DDPU
The connection for one cell is showed
in the right slide
BSC data configuration should be
PBT mode
receive independence mode
Cabinet Top powerdBm
49 - 1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical configuration S4/4/4
wideband transmit combination mode
S4/4/4 wideband transmit combination
modeeach cell is configured two
DTRU and one DDPU
BSC data configuration should be
wideband transmit combination mode
receive diversity mode
Cabinet Top powerdBm
46 or 47.8-3.3-1.0
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
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Typical Configuration S1/2/1
S1/2/1,cell1 and cell 3 share one
DTRU, cell 2 need one DTRU and
one DDPU
BSC data configuration should be
transmit independence mode
receive independence mode
transmit independence mode
receive diversity mode
Cabinet Top powerdBm
46 or 47.8-1.0
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
DTRU
TX 1
TCOM
RXM 1
RXM 2
RXD 1
RXD 2
TX 2
IN2
IN 1
DTRU1
DTRU2
cell1 cell3 cell2
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Typical configuration S8/8/8
S8/8/8 cell 1 and cell 3 are
configured 4 DTRU,2 DCOM and
1 DDPU
BSC data configuration should be
wideband transmitcombination mode
receive diversity mode
Cabinet top powerdBm
46 or 47.8-3.3-3.3-1.0
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
DCOM DCOM
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Typical configuration S8/8/8
S8/8/8 cell2 is configured 4
DTRU,2 DCOM and 2 DDPU,cell 2 need cross the cabinet
BSC data configuration
should be
wideband transmit
combination mode
receive diversity mode
Cabinet top powerdBm
46 or 47.8-3.3-3.3-1.0
Attentiononly support
frequency hoppingDTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
RF-EX1
RF-EX2
RF-EX3
RF-EX4
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
DDPU
TX B
RXB1
RXA1
RXA2
RXA3
RXA4
RXB2
RXB3
RXB4
TX A
TX 2
TX1
DTRU
TX 1
TCOM
TX 2
IN2
IN 1
Tx-com
RF-EX1
RF-EX2
RF-EX3
RF-EX4
DCOM DCOM
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Combined Cabinet Signal Cables
The connection of the signal cables of the combined cabinet is as follows:
The main and slave cabinets are connected by the data cables,
control cables, and clock cables
The main and slave combined cabinets are connected by the clock
cables and control cablesThe main and slave cabinets and combined cabinets require the DIP
switches
Slave
cabinet
of main
cabinet
group
Main
cabinet
of main
cabinet
group
Maincabinet
of
slave
cabinet
group
Slavecabinet
of
slave
cabinet
group
Data cable
Clock cable
Control cable
Clock cable
Control cableData cable
Clock cable
Control cable
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Functions and features of BTS3012
BTS3012 hardware structure Antenna and feeder system
Typical configuration
Summary
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