Huawei Gsm Grfu Introduction 090220 Issue1.0 b

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Huawei Confidential
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This course mainly introduces the hardware structure, function, configuration principle and data configuration of multi-carrier GRFU (The GSM Radio Filter Unit ) of BTS3900 base station.
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Master the typical configuration of GRFU.
Master the data configuration of GRFU.
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Chapter 1 Principle and function of GRFU Chapter 2 Typical configuration of GRFU
Chapter 3 Data configuration of GRFU
The principle of multi-carrier technology: multiple carriers share one power amplifier and one RF channel.
Features of multi-carrier technology.
Digital IF combination replaced Analog RF combination. There isn’t
combination loss.
Integration of part of RF front component and carrier frequency unit.
Simplified BTS architecture.
signals and RF signals, processes data, and combines and divides
signals.
Implements the direct frequency conversion technique in the transmit channel,
modulates the baseband signals to GSM RF signals; then, sends the signals to
the antenna for transmission through the duplex filter after filtering, amplifying,
and combining the RF signals. The combining can be performed as required.
Receives RF signals from the antenna and performs down-conversion,
amplification, analog-to-digital conversion, digital down-conversion, matched
filtering.
Provides power control, reverse power detection.
Provides frequency synthesis and loopback test.
Generates the CPRI clock, recovers the CPRI clock of lost synchronization, and
detects alarms.
DPDdigital prediction distortion
BPDbaseband prediction distortion
Provides Voltage Standing Wave Ration (VSWR) detection.
Provides power sharing. Improves the network coverage, reduces the interference
and power consumption and save the device cost.
The main limitation of GRFU.
GRFU supports whole frequency band of PGSM 900MHz, high 45MHz frequency band and low 45MHz frequency band of DCS1800MHz.
Instantaneous frequency bands of TX: M900:15MHz, M1800:15MHz. That
means the frequency interval of any two frequency in a RF channel must not more than15MHz. Instantaneous bandwidth of RX is 25MHz.
Power sharing doesn’t support Concentric cell, Co-BCCH, IBCA, RAN sharing while static power can support these functions.
If GRFU support power sharing, DTX, Power control III, intracell handover must be open.
GRFU
DL
UL
935-960MHz
890-915MHz
Logical structure of the GRFU
The GRFU consists of the high-speed interface unit, signal processing unit, power amplifier, and duplexer.
PA
LNA
LNA
Weight10Kg
ANT_RXB
ANT_TX/RXA
CPRI
CPRI0
SFP female connector
Connecting to the BBU, or the upper-level RFU during the cascading.
CPRI1
Interconnection port for RF Receive signals
RX_INB
RX_OUTA
Power supply port
Ports on the panel of the GRFU
Compare ports on the panel of GRFU with that of DRFU
Port Type
ANT_TX/RXA
lower
ANT1
upper
ANT_RXB
upper
ANT2
lower
CPRI
CPRI0
lower
CPRI0
upper
CPRI1
upper
CPRI1
lower
RX_INB
upper
LED
Color
Status
Description
RUN
Green
ON
The power input is normal, but the module is faulty.
OFF
There is no power supply, or the module is faulty.
1s ON, 1s OFF
0.2s ON, 0.2s OFF
ALM
Red
OFF
ACT
Green
ON
The module is functional and is correctly connected to the BBU.
OFF
VSWR
Red
OFF
ON
CPRI0
Red/Green
ON (red)
1s ON, 1s OFF (red)
The CPRI link is out of lock.
CPRI1
Red/Green
ON (red)
1s ON, 1s OFF (red)
The CPRI link is out of lock.
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GRFU Application Scenarios
Basic configuration principle
The DRFU and GRFU can be configured in the same cabinet. When the
GRFU is configured, a single BTS3900/BTS3900A provides a maximum
of 36 carriers with the maximum cell configuration of S12/12/12. In addition,
a site configured with the BTS3900s can support a maximum of 72 carriers
with the maximum cell configuration of S24/24/24.
One GRFU supports a maximum cell configuration of S6; two GRFUs
supports a maximum cell configuration of S12. To support the configuration
larger than S12, multiple antenna systems are used.
One GRFU does not serve two cells. Each cell with a single antenna can be
configured with a maximum of two GRFUs.
GRFU supports 1-way TX and 2-way RX.
Star, chain, and ring, are supported between the BBU and the GRFUs.
When star and chain topology is adopted between the BBU and GRFUs, the
GRFU supports 3 levels of cascading in a chain and thus the BBU supports
a maximum of 18 (6 x 3) GRFUs.
Frequency Assignment
If the frequency interval of a cell is outside the range of 15MHz, 2 GRFUs can
be considered to be used and the range of frequency for each GRFU also
should be within15MHz.
Generally, it is suggested that the number of carriers should be set to 2 GRFUs
averagely if 2 GRFUs are used in a cell. For example: S8 should be configured as 4+4 when 2 GRFU are used. S7 should be configured as 3+4 when 2 GRFU are used. If there’s limitation of frequency band, S8 also can be configured as 3+5 or 2+6.
Output power
The output power for each cell must fulfil the requirement of network plan.
When the specification doesn’t fulfil the requirement, it can be improved by
adding GRFUs.
The output power of all the cell must be the same because power sharing is
mutually exclusive with concentric cell. For example, S7 configured as 3+4
when 2 GRFUs are used. The output power of GRFU configured as 3 carriers
must be the same as that of GRFU configured as 4 carriers.
Limitation of Output power
Carrier of a cell
2+3
3+3
3+4
4+4
4+5
5+5
5+6
6+6
Output power
1+4
Frequency hopping
Cell without frequency hopping. The cell can work normally when the range of
frequency is within 15MHz for each GRFU.
Cell with Baseband frequency hopping. The frequency range of 2 GRFUs must
within 25MHz when 2 GRFUs are used. And the range of frequency also must
be within 15MHz for each GRFU.
Cell with RF frequency hopping. The cell cannot adopt RF frequency hopping if
the range of frequency is out of 15MHz. Because the frequency range of 2
GRFUs must be within 15MHz when 2 GRFUs are used.
One dual-polarized antenna can serve a maximum of two GRFUs.
By default, RX diversity is adopted on the GSM network. That is, two feeders connected to two single-polarized antennas or one dual-polarized antenna must be configured in a cell.
Each sector of the BTS must be configured with the minimum number of antennas.
For the 2-way RX diversity, each sector has two antenna channels.
Transmit Mode of GRFU
The output power of different configuration is also configured differently.
Frequency bands
configured, one TX channel and two RX
channels are supported. The ANT_RXB
and ANT_TX/RXA ports receive the signals
from the antenna to achieve RX diversity.
S12, two GRFUs need to be configured.
The ANT_TX/RXA port on each GRFU
supports the receiving and transmitting of
signals. Two GRFUs provide RX signals for
each other through the RF interconnection
ports. Thus, the RX diversity is implemented.
The ANT_TX/RXA port on GRFU supports the
receiving and transmitting of signals.
The ANT_TX/RXA port on GRFU supports
the transmitting of signals.
receiving of signals.
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Data configuration of GRFU is similar with that of DRFU.
End
Start
must set as GRFU Separate Mode must set asSupport
RXU Chain Head Port No means BBU CPRI port number
connected to GRFU.
Example:
ADD BTS: BTSIDX=0, BTSNAME="BTS3900", TYPE=BTS3900_GSM, UPNODE=BSC, SRN=0, SN=18, PN=0, MPMODE=MODE4_1, AST=ACTIVAED, DCIDX=0, ServiceMode=TDM, DCELLNAME="0", DCTYPE=GSM900, DCMCC="460", DCMNC="04", DCLAC=0557, DCCI=0001, DTRXIDX=0, CPLMode=SUPPORT, TRXBN=0, TRXTP=GRFU, TRXPN=0, FREQ=96, RXUName="0", RXUChainNo=0, RXUChainHeadPN=0, REVCFGRING=NO;
Example:
ADD SLAVECHAIN: IDXTYPE=BYNAME, BTSNAME="BTS3900", INPN=1, DESTNODE=BSC, SRN=0, SN=18, PN=1;
Abis interface board port number
Example:
ADD CELL: IDXTYPE=BYNAME, BTSNAME="BTS3900", CELLNAME="cell-1", CTYPE=GSM900, AST=ACTIVAED, MCC="460", MNC="04", LAC=0557, CI=0001, TRXBN=1, TRXTP=GRFU, TRXPN2=0, TRXFREQ=88, RXUName="1", RXUChainNo=1, RXUChainHeadPN=1;
Example:
ADD TRX: IDXTYPE=BYNAME, CELLNAME="cell-1", TRXBN=1, TRXTP=GRFU, TRXPN2=0, FREQ=88, RXUName="1", RXUChainNo=1, RXUChainHeadPN=1;
Example:
MOD TRXDEV: IDXTYPE=BYNAME, CELLNAME="cell-1", TRXBN=1, TRXPN=0, POWL=10, POWT=DEFAULT, RCVMD=MAINDIVERSITY, SNDMD=DIVERSITY;
Modify name of RXU boardSET RXUNAME
Query parameter of RXU boardLST RXUBP
Query Attributes of RXU linkLST RXUCHAINPARA
Query topology structure of RXU link LST RXUCHAINTPLGY
Set breakpoint of RXU link SET BREAKPOINT
Combine two RXU links to a ringCBN RXUCHAIN
Set breakpoint SET BREAKPOINT
Thank you

Huawei Gsm Grfu Introduction 090220 Issue1.0 b

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