huawei nodeb hardware & dimension
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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Huawei NodeBHardware & Dimension
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Huawei NodeB Hardware & Dimension
Huawei NodeB family overview
R4 platform hardware introduction
R4 platform hardware configuration rule
New HW in R3 platform in RAN10.0
Contents
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TheThe UniUni BTSBTS
HuaweiNode
BEvolution
Open architecture
Zero footprint Integrated architecture
High-performance
HSDPA
Digital Multi-Carrier PA
BTS3812
BTS3812 E
R1
R2
R3
BBU3806
RRU3801C
Convergent architecture
W/G/L/C/WiMAX Co-platform
Stackable Design
R4
indoor outdoorBBU
RRU
Never stop to focus on
High quality and stability
Reduce CAPEX& OPEX
Fast deployment
Smooth evolution
Improve power efficiency
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Huawei NodeB Family
MacroNodeB
BTS3900
BTS3900A
iDBS3800
BBU3806+RHUB3808+pRRU3801
Indoor distributed
NodeB
BTS3801C
BTS3803C
Mini NodeB
R4 design
R3 designMacroNodeB
BTS3812E
BTS3812AE
DistributedNodeB
DBS3900
BBU3900+RRU3804/
RRU3801E
DBS3800
BBU3806/C+RRU3801C
Distributed
NodeB
Micro NodeB
BTS3900C
RHUB
BBU
iDBS3900
BBU3900+RHUB3808+pRRU3801
Indoor distributedNodeB
RHUB
BBU
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Advanced Architecture: Same modules for all NodeB portfolioAdvanced Architecture: Same modules for all NodeB portfolio
Main Module
19 inch
Support 24 cells
RRU/RFU
60W/80WOutput Power
BBU
Distributed Node BDBS3900
1Indoor macro Node B
BTS3900
2Outdoor macro Node B
BTS3900A
3
ConvergenceDistributed Node and traditional Node B, Only 3 module for all Node B
More flexible for deployment
Optimized Logistics costs
Minimized spare part stock
Lower Maintenance costs
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Huawei NodeB Hardware & Dimension
Huawei NodeB family overview
R4 platform hardware introduction
R4 platform hardware configuration rule
New HW in R3 platform in RAN10.0
Contents
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Units and auxiliary devices of the 3900 series Node Bs
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BBU3900 specification
IP20IP environmental ratings
STTD or TSTD supportedTransmit diversity
Up to 40km, 4-level RRU cascading to 100kmMax distance RRU/BBU
-20 to +55CTemperature range
Maximum: 6 sectors4 carriers 3
sectors8 carriersConfiguration
6 CPRI 2.0 optical or electrical 1.25Gbit/s
2.5Gbit/sInterface with RRU
max 32 E1 or 4 FE+8 E1Transmission interfaces
Typical: 100W
Maximum: 250WMax power consumption
Standard
Optional
2-way receive diversity
4-way receive diversity
1536 UL / 1536 DL CECapacity (1 BBU)
-48V DC
Range from: 38.4 V DC to 57 V DCPower supply
7kg (typical configuration)
11 kg (full configuration)Weight
442 mm x 86 mm x 310 mm (W x H x D)Mechanical Dimensions
310mm
2U
19inch
BBU3900
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DBS3900-RRU Specification
RRU3804/RRU3801E
-129.3dBm (2-way Rx diversity) 2100MReceiversensitivity
RRU3804: 4 carriers per RRU, 60 W antenna output powerRRU3801E: 2 carriers per RRU, 40W antenna output power
Output power
2100 MHz: DL:19201980 UL: 211021701900 MHz: DL:18501910 UL: 19301990850 MHz: DL: 824849 UL: 869894AWS: DL:1710-1755 UL: 2110-2155
Frequencyband
2 CPRI interfaces(1.25Gbps, CPRI V2.0)CPRIinterface
Hardware ready for 64QAM, MIMO, LTEFutureproofness
-48 V DC Voltage range: 38.4 V DC to 57 V DCPower supply
40C to +45C (with solar radiation of 1,120 W/m2)40C to +50C (without solar radiation)
Operationtemperature
15kg without coverWeight (kg)
480mm*270mm*140mm without coverDimensions(H x W x D)
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DBS3900-SRXU Specification
2 CPRI interfaces(1.25Gbps, CPRI V2.0)CPRI interface
30W(maximum)Powerconsumption
480mm*270mm*60mm480mm*270mm*210mm (Installed with RRU)
Dimensions (Hx W x D)
6kgweight
2100 MHz: DL:19201980 UL: 21102170Frequency
band
By RRU3804Power supply
40C to +45C (with solar radiation of 1,120W/m2)
40C to +50C (without solar radiation)
Operationtemperature
The RRU3804 can support 4-way RX diversity by adding an SRXU externally
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WRFU specification
WRFU
Maximum 80W shared by 4 carriers
-129.3dBm (2-way Rx diversity)Receiversensitivity
type1: 4 carriers per WRFU, 80 W antenna output powertype2: 2 carriers per WRFU, 40W antenna output power
Output power
2100 MHz: DL:19201980 UL: 21102170Frequencyband
1 7/16 DINMain TX/RXport
Hardware ready for 64QAM, MIMO, LTEFutureproofness
-48 V DC Voltage range: 38.4 V DC to 57 V DCPower supply
2 CPRI interfaces(1.25Gbps, CPRI V2.0)CPRIinterface
1 7/16 DINRX diversityport
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APM30 and APM100 specification
4U with 100Ahbattery
7U Without userequipment5U with 2U BBU39005U with 12Ah or 24Ahbattery2U with 36Ah battery
Space for userequipment
Output voltage
DC outputs
Input voltage
Workingtemperature
Weight
Dimensions (W xH x D)
88 kg< 65 kg
600 mm x 1130 mmx 600 mm
600 mm 700 mm480 mm
APM100APM30
176 V AC to 290 V AC
220 V AC single-phase
110 V AC dual-wire
North model: 40C to 45CSouth model: 5C
to 45C
40C to 45C(with1120 W/m2 solarradiation)
58 V DC to 44 V DC
16 A x 4: 432 A x 2: 2
10 A x 5: 550 A x 1: 15 A x 2: 2
APM30
APM100
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Indoor cabinet
1Maximum configuration ofBBU3900 module
2USpace for user equipment
Protection level
Maximum configuration ofRFU module
Input voltage
Working temperature
Empty Cabinet Weight
Dimensions (H x W x D)
< 70 kg
900 mm x 600 mm x 450 mm
48 V DC, Voltage range: 38.4 VDC to 57 V DC+24 V DC, Voltage range: +21.6 VDC to +29 V DC220 V AC single-phase and three-phases power cable
20C to +50C
IP20
6
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Outdoor RFU cabinet
3 RFU cabinet
6 RFU cabinet
50Ah and 100Ah optionalBuilt batteries for 3RFUcabinet
Protection level
Maximum configuration ofRFU module
Input voltage
Working temperature
Empty Cabinet Weight
Dimensions (W x H x D)
< 55 kg
600 mm 700 mm 480 mm
-48V
40C to 45C (with1120 W/m2
solar radiation)
IP55
3 RFU cabinet: 36 RFU cabinet: 6
RFU cabinet + APM30 = BTS3900A
BTS3900A
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BTS3900 specification
Two cabinet can be
stacked with one footprint
-129.3dBm (2-way Rx diversity) 2100MReceiversensitivity
type1: 4 carriers per WRFU, 80 W antenna output powertype2: 2 carriers per WRFU, 40W antenna output power
Output power
2100 MHz: DL:19201980 UL: 21102170Frequencyband
24 cells;
Maximum configuration: 6 sectors x 4 carriers, 3 sectors x 8carriersUL: 1,536 CEs DL: 1,536 CEs
Capacity
48 V DC, Voltage range: 38.4 V DC to 57 V DC+24 V DC, Voltage range: +21.6 V DC to +29 V DC220 V AC single-phase and three-phases power cable
Power supply
Configuration Typical Maximum3x1 520W 620W3x2 610W 830W3x3 810W 1070W3x4 1020W 1330W
Powerconsumption
A maximum of 32 E1/T1 ports, 2 FE electrical ports, 2 FEoptical ports
Transmissioninterface
900 mm x 600 mm x 450 mmDimensions(H x W x D)
Note for power consumption: typical 50load
max 100
load
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BTS3900A specification
-129.3dBm (2-way Rx diversity) 2100MReceiversensitivity
type1: 4 carriers per WRFU, 80 W antenna output powertype2: 2 carriers per WRFU, 40W antenna output power
Output power
2100 MHz: DL:19201980 UL: 21102170Frequencyband
24 cells;Maximum configuration: 6 sectors x 4 carriers, 3 sectors x 8carriersUL: 1,536 CEs DL: 1,536 CEs
Capacity
220 V AC single-phase and three-phases power cable110 V AC dual-live-wire power cable
Power supply
A maximum of 32 E1/T1 ports, 2 FE electrical ports, 2 FE
optical ports
Transmission
interface
700 mm x 600 mm x 480 mmDimensions(H x W x D)
3.8 hours1.6 hours1580 W1220 W3 x 4
5.2hours2.3 hours1300 W950 W3 x 3
7.5 hours3.2 hours970 W730 W3 x 2
8.8 hours3.8 hours740 W630 W3 x 1
100 Ah50 AhMaximum100% load
Typical50% load
Configuration
Estimate of typical Power Backup time with Typical powerconsumption and new battery
Power consumption (AC)
APM30
RFUcabinet
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DBS3900 specification
One RRU module supports 4 carriers, 60 W output power.Output power
2100 MHz: DL:19201980 UL: 211021701900 MHz: DL:18501910 UL: 19301990850 MHz: DL: 824849 UL: 869894AWS: DL:1710-1755 UL: 2110-2155
Frequencyband
24 cells;Maximum configuration: 6 sectors x 4 carriers, 3 sectors x 8carriers
UL: 1,536 CEs DL: 1,536 CEs
Capacity
-48 V DC Voltage range: 38.4 V DC to 57 V DC220 V AC single-phase power cable110 V AC dual-live-wire power cable
Power supply
Configuration Typical Maximum3x1 400W 500W3x2 550W 740W3x3 710W 970W
Powerconsumption
A maximum of 48 E1/T1 ports, 2 electrical FE ports, 2 opticalFE ports
Transmissioninterface
BBU3900: 442 mm x 86 mm x 310 mm (W x H x D)RRU3804: 480 mm x 270 mm x 140 mm (W x H x D) (withoutcover)RRU3801E: 480 mm x 270 mm x 140 mm (W x H x D) (without
cover)
Dimensions(H x W x D)
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BTS3900C specification
Configuration Typical Maximum1x1 230W 260W
1x2 280W 350W1x3 330W 420W
Powerconsumption
-129.3dBm (2-way Rx diversity) 2100MReceiversensitivity
One RRU module supports 3 carriers, 60 W output power.Output power
2100 MHz: DL:19201980 UL: 211021701900 MHz: DL:18501910 UL: 19301990850 MHz: DL: 824849 UL: 869894AWS: DL:1710-1755 UL: 2110-2155
Frequencyband
3 cells, Maximum configuration: 1x3UL: 384 CEs DL: 384 CEs
Capacity
IP55Protectionlevel
-48 V DC Voltage range: 38.4 V DC to 57 V DC220 V AC single-phase power cable110 V AC dual-live-wire power cable
Power supply
40C to +45C (with solar radiation of 1,120 W/m2)40C to +50C (without solar radiation)
Operationtemperature
35Weight (kg)
A maximum of 8 E1/T1 ports, 2 FE electrical ports, 2 FE opticalports
Transmissioninterface
600 mm x 400 mm x 390 mm600 mm x 240 mm x 390 mm (used as outdoor BBU)
Dimensions(H x W x D)
AC input
DC input
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Huawei NodeB Hardware & Dimension
Huawei NodeB family overview
R4 platform hardware introduction
R4 platform hardware configuration rule
New HW in R3 platform in RAN10.0
Contents
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RRU/
RFU
RRU/
RFU
3900 Overview : Architecture3900 Overview : Architecture
TR Unit
SPM
SPM
BB
Capac
ity
Exte
nsio
nBB unit
WBBP
WBBP
WBBP
WBBP
Connectivity
Exte
nsion
UTRP
RNC
ATM mobile backhaul
RNC
IP mobile backhaul
Capacity of One RRU/RFU
4
1Sector
Carrier
2FE Electrical
Interface of One BBU
2
32E1
FE optical
RF
Capac
ity
Exten
sio
n
Iub Interface
CPRI
Capacity of One BBU
UL:1536DL:1536
24Cell
CEBBU3900
RRU/
RFU
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System Architecture of BBU
2U Height8 slots
8 card slots, flexible replace and easy evolution
High integrated and capacity, 2U size support 24 cells, UL/DL 1536CE
WBBP:WCDMA baseband processingand interfacing board
WMPT:WCDMA Main Processing
& Transmission unitUTRP:Universal Transmission
Processing Unit
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WMPT Configuration Rule
WMPT:
Transport interface: 4 E1, 1FE electrical interface, 1FE optical interface
Clock function: Provides primary reference clock signals for the entire Node B
Signaling processing for the whole Node B O&M: Supporting O&M
The maximum configuration of WMPT is 2, the minimum is 1
F
A
N
PWR
PWR
WBBP
WBBP
WBBP
WBBP
UTRP
UTRP
WMPT
WMPT
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WBBP Configuration Rule
F
A
N
PWR
PWR
WBBP
WBBP
WBBP
WBBP
UTRP
UTRP
WMPT
WMPT
HS-DPCCH
Common channel
HS_DSCH 90Codes
DL R99 CEs
UL R99/HSUPA CEs
Common channel
DL
UL
Dedicated processing resource for HSDPA, no
CE consumption for HSDPA
Reserved CEs and cost free for commonchannels
12Mbps30Mbps90 HS-PDSCH codes3843846 cellsWBBPb4
12Mbps30Mbps90 HS-PDSCH codes2562566 cellsWBBPb3
6Mbps15Mbps45 HS-PDSCH codes1281283 cellsWBBPb2
6Mbps15Mbps45 HS-PDSCH codes64643 cellsWBBPb1
6Mbps15Mbps45 HS-PDSCH codes2561283 cellsWBBPa
HSUPAthroughput
HSDPA
throughputHSDPA Capacity
Downlink R99
CE
Uplink R99
/HSUPA CECellBoard Type
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UTRP Configuration Rule
38 42 32E1 864256E1
It is an optional board to be configured
One UTRP provides 8E1/T1, other type is to be planned
The maximum configuration of UTRP is 6, the minimum is 0
Support ATM and IP hub Node B. Maximum 32E1, 16 downstream Node B. Support 5
level network
UTRP
WBBP
WBBP
WBBP
UTRP
UTRP
WMPT
WMPT
2*FE+4*E1
8*E1
8*E1
2*FE+4*E1
8*E1
UTRP
UTRP
UTRP
UTRP
UTRP
UTRP
WMPT
WMPT
2*FE+4*E1
8*E1
8*E1
2*FE+4*E1
8*E1
8*E1
8*E1
8*E1
F
A
N
PWR
PWR
WBBP
WBBP
WBBP
WBBP
UTRP
UTRP
WMPT
WMPT
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RRU Configuration Rule
RF signals processing including two RX channels and one TX channel
The maximum configuration of RRU is 6, the minimum is 1
Capacity1 Sectors, 4 Carriers, 60W output power license control enable smooth capacity expansion to protect operators investment.
Carrier license is quoted for additional carrier (2nd, ) within one RRU
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WRFU Specification
WRFU
Maximum 80W shared by 4 carriers
Max 80W output power, and 4 carriersMax 80W output power, and 4 carriers
1-carrier configuration: 60 W per carrier 2-carrier configuration: 40 W per carrier
3, 4 carrier configuration: 20 W per carrier
The configuration in one (BTS3900/BTS3900A)cabinetThe configuration in one (BTS3900/BTS3900A)cabinet
The maximum confiugration is 6, and typical configuration 1 WRFU per sector
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NodeB HW Configuration example
NodeB Requirements:S111/20W, 3E1,DL/UL: 32CE/30CE,
HSDPA 10 code/16QAM,HSUPA phase1,BBU installed indoors
Distributed NodeB requirement.
2 Optical Transceiver Module per RRU6Optical TransceiverModule
S111 configuration, 3 RRU needed3RRUBaseband Processing b2, HSUPA Phase2, Cell:6, CE UL:128 L:128.1WBBPb2
Main Control and Transport unit, provides 4 E1 and 1 electrical FE and 1
optical FE interfaces
1WMPT
Basic Module , One Subrack per Node B1BBU3900 Subrack
RemarkQuantity
Unit
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Huawei NodeB Hardware & Dimension
Huawei NodeB family overview
R4 platform hardware introduction
R4 platform hardware configuration rule
New HW in R3 platform in RAN10.0
Contents
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New HW in R3 platform in RAN10.0
Extension Baseband Module
It is a new sub board for BBU3806C to support HSUPA Phase2
EBBM (Extension
Baseband Card)
for BBU3806C
Same band Antenna Sharing UnitSASU(RAN6.1)
Extension Baseband Card
It is a new sub board for BBU3806 to support HSUPA Phase2
EBBC (Extension
Baseband Card)
for BBU3806
Enhanced Uplink Processing Unit
Supporting HSUPA p2 for BB expansion and evolution in BTS3812E andBTS3812AE
EULP
To support expansion and evolution in BTS3812EWRFU 8U
If diversity transmit is configured at the GSM BTS, then the SASA900 is requiredSASA(RAN6.1)
Enhanced BaseBand Interface processing Unit Supporting HSUPA p2 for
BB expansion and evolution in BTS3812E and BTS3812AE
EBBI
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EBBC specification
256CE/192CE + 45 code 512CE/384CE + 90 code
HSPA+ hardware ready
HSPA+ : softwareupgrading
EBBC EBBC
1Q/20071Q/20091Q/2008For capacity expansion For HSUPA II
/HSPA+
Huawei1U
The EBBC capacity and function is
3 RACH R99 (support up to 3*1,i.e. )
Support E-UL (2ms TTI) in 6 cells with BBU3806
Hardware ready for 64QAM and MIMO
Support CCPIC in 3 cells Maximum throughput up to 12Mbps for both R99 and HSUPA P2 in UL direction.
Maximum throughput up to 30Mbps for both R99 and HSDPA in DL direction.
Total maximum throughput for HBBU and EBBC up to 40Mbps for sum of UL and DL
One BBU3806 has 1 extension slot to evolution
Support 3*2 in 1U space
Support 2BBU interconnection for large capacity 3*4
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EBBM specification
The EBBM capacity and function is
3 RACH R99 (support up to 3*1,i.e. )
Support E-UL (2ms TTI) in 6 cells with BBU3806C
Hardware ready for 64QAM and MIMO
Support CCPIC in 3 cells Maximum throughput up to 12Mbps for both R99 and HSUPA P2 in UL direction.
Maximum throughput up to 30Mbps for both R99 and HSDPA in DL direction.
Total maximum throughput for HBBU and EBBC up to 40Mbps for sum of UL and DL
19232090 HS-PDSCHcodes
5123841 BBU with EBBM
NA12845 HS-PDSCHcodes
2561921 BBU3806C
HSUPAphase2 CE
HSUPAphase1 CE
HSDPACapacity
DownlinkR99 CE
Uplink R99CE
Configuration
BBU3806C interconnection is not supported for it is for micro application
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EBBI specification
6 RACH R99 (support up to 3*2,i.e. )
Support E-UL (2ms TTI)
Hardware ready for 64QAM and MIMO
Support CCPIC in 6 cells
Maximum throughput up to 12Mbps for both R99 and HSUPA P2 in UL direction.
Maximum throughput up to 30Mbps for both R99 and HSDPA in DL direction
The maximum configuration of EBBI in BTS3812E/AE is 6
UL 384 CE 128CE
DL 384 CE 256CE
ULCCH 6CE
DLCCH 16CEfor PCCPCH,SCCPCH,
E-AGCH/E-RGCH/E-HICH
EBBI
HSDPA
DL 90 HS-PDSCH
UL384 HS-DPCCH
R99E-UL 10ms
E-UL 2ms
24 HS-SCCH
Commoncontrolchannel
reserved.Free foroperator
R99
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EULP specification
6 RACH R99 (support up to 3*2,i.e. )
Support E-UL (2ms TTI)
Support CCPIC uplink function in 6 cells Maximum throughput up to 12Mbps for both R99 and HSUPA in UL direction.
The maximum configuration of EULP in BTS3812E/AE is 2
UL 384 CE ULCCH 6CE
EULP
R99E-UL 10ms
E-UL 2ms Commoncontrolchannel
reserved.Free foroperator
UL384 HS-DPCCHHSDPA
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WRFU plugged in BTS3812E
WRFU
Maximum 80W shared by 4 carriers
Max 80W output power, and 4 carriersMax 80W output power, and 4 carriers
1-carrier configuration: 60 W per carrier
2-carrier configuration: 40 W per carrier
3, 4 carrier configuration: 20 W per carrier
RFU: which is compatible with existing Macro NodeB
Typical configuration 1 WRFU per sector
NBBIMTRU WRFU MTRU WRFU MTRU WRFU
MAFUfake
AFUMAFU
fake
AFUMAFU
fake
AFU
NFAN
wireholder
wireholder
b
u
s
b
a
r
N
M
O
N
N
C
C
U
H
B
B
I
H
B
B
I
N
U
L
P
N
U
L
P
N
U
L
P
N
U
L
P
N
U
L
P
N
U
L
P
N
D
L
P
N
D
L
P
N
M
P
T
N
M
P
T
N
D
T
I
N
D
T
I
N
D
T
I
N
B
B
I
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SASU scheme and application
TX path is independent for GSM and UMTS; RX path is shared for both GSM and UMTS;
Especially suit for suburban and rural coverage.
No impact on frequency plan and reassignment;
No additional protection band between GSM and UMTS;
The noise figure increased is less than 0.4dB;
TMA is not needed when RRU is near the antenna.
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SASU specification
Wall mounting
Mast mounting
Pole mounting
386 mm x200 mm x 118.6 mmDimensions (width x
height x depth)
8.5 kgWeight
7/16 DIN femaleConnector
Indoor or outdoor (IP66)Application
-40 to 65Temperature range
2.176 MHzAISG OOK
50Impedance
3 dBmIP-1
52 dBm (average)/57.1 dBm (peak) (65, 0.545 atm)Power handling
150 dBc (3rd PIM: @880 MHz to 915 MHz)PIMTypical values: 1.8 dB (12 dB gain), 4 dB (0 dB gain)Uplink noise figure
0 dB to 12dB; step: 1dB; precision1 dB; band ripple 1
dB
Uplink gain
> 20 dBIsolation between RXM
and RXD
15 dB (electrify)RX return loss
18 dBTX return loss
0.4 dB (typical value)TX insertion loss
TX: 925 MHz to 960 MHz; RX: 880 MHz to 915 MHzFrequency
SpecificationItem
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SASA scheme and application
BTS
GSM
L
NodeB
UMTS
SASU
SASA
GSM TX/RX GSM TX/RX
GSM_M GSM_D
ANT_M ANT_D
ANT_M
ANT_D
UMTS_M
UMTS_D
ANT_M ANT_D
GSM_M GSM_D
TX filter
RX filter
RX path
TX path
DC path
Bias Tee
ASA
When GSM transmit power via two antennas, SASA+SASU application with small insertion loss
improve the frequency band efficiency
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SASA specification
Wall mounting
Mast mounting
GSM_D -> ANT_D 25 dB940 MHz to 960 MHz
GSM_D -> ANT_M 25 dB880 MHz to 935 MHz
GSM_M -> ANT_M 25 dB940 MHz to 960 MHzIsolation
Input 2 tone signals at
GSM_M port or GSM_D
port
130 dBc (3rd order,
2 x 20 W tone)
160dBc ( 5rd
order, 2 x 20 W tone)
880 MHz to 915 MHzPIM
100 W (average value)956.8 MHz to 960 MHz
GSM_DANT_M
* 100 W (average value)925 MHz to 951 MHz
GSM_MANT_M
Power
handling
GSM_D -> ANT_M 0.8 dB940 MHz to 960 MHz
GSM_M -> ANT_M 0.8 dB925 MHz to 935 MHz
GSM_M -> ANT_MGSM_D->ANT_D
0.5 dB880 MHz to 915 MHzMaximum
insertion loss
GSM_D, ANT_M 1.2940 MHz to 960 MHz
GSM_M, ANT_M 1.2925 MHz to 935 MHz
All ports 1.2880 MHz to 915 MHzReturn loss
Note: @VSWR=1.5 and the respective test signals for GSM port are GSM dual carriers signal,
PAR=3.5dB, (pressure: 0.545 atm, Temperature: 65) when test is be done, the below 3.5
(high power experiment requirement) is recommended.
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Thank you
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Copyright2007 Huawei Technologies Co., Ltd. All Rights Reserved.The information contained in this document is for reference purpose only, and is subject to
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