Huawei Gsm Grfu Introduction 090220 Issue1.0 b

2009-02

Security Level: Internal Use

HUAWEI GSM GRFU Introduction www.huawei.com

ISSUE1.0

Wireless Case and Training

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

 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.

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

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 Know the hardware principle and structure of GRFU.  Master the typical configuration of GRFU.  Master the data configuration of GRFU.

HUAWEI TECHNOLOGIES Co., Ltd.

HUAWEI Confidential

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Chapter 1 Principle and function of GRFU Chapter 2 Typical configuration of GRFU Chapter 3 Data configuration of GRFU


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Multi-Carrier Technology 

The principle of multi-carrier technology: multiple carriers share one power amplifier and one RF channel.

Single-carrier Technology



Multi-carrier Technology

Features of multi-carrier technology.  Baseband pool replaced independent baseband unit. Improve the integration. 

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.


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Introduction of GRFU  The GRFU performs modulation and demodulation between baseband

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.  Provides the function of DPD/BPD.


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Introduction of GRFU  The main new features and functions of GRFU.  Inner Bias-Tee. Integration of feeder current to TMA.  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.


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Introduction of GRFU  The main limitation of GRFU.  GRFU supports whole frequency band of PGSM 900MHz, high 45MHz

frequency band and low 45MHz frequency band of DCS1800MHz. GRFU

DL

UL

Whole 25MHz frequency band of 900MHz

935-960MHz

890-915MHz

Low 45MHz of 1800MHz

1805-1850MHz

1710-1755MHz

High 45MHz of 1800MHz

1835-1880MHz

1740-1785MHz

 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. HUAWEI TECHNOLOGIES Co., Ltd.

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Logical structure of the GRFU  The GRFU consists of the high-speed interface unit, signal

processing unit, power amplifier, and duplexer.

GRFU

CPRI

high-speed interface unit

B B U

TX signal processing unit

PA TX/RXA TRX

RX signal processing unit

D U P

LNA

RXB

LNA

RX OUTA RX INB


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Ports on the panel of the GRFU  Size：397.25mm（h）×70.62mm（w）×305mm（d）

Weight：10Kg  Ports on the panel Port Type

Label

Connector Type

Description

Port for

ANT_RXB

DIN connector

Connecting to the antenna subsystem.

SFP female connector

Connecting to the BBU, or the upperlevel RFU during the cascading.

transceiving

ANT_TX/RXA

RF signals CPRI

CPRI0 CPRI1

Interconnection

RX_INB

port for RF

Connecting to the lower-level RFU during the cascading. QMA female connector

Input port of diversity signals in the antenna channel. Output port of diversity signals in the antenna channel.

Receive signals

RX_OUTA

Power supply

PWR

3V3 power connector

Feeding power.

MON

RJ45 connector

RS485 Monitoring、debugging port.

port Monitoring port


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Ports on the panel of the GRFU  Compare ports on the panel of GRFU with that of DRFU

Port Type

GRFU

Relative position

DRFU

Relative position

Port for

ANT_TX/RXA

lower

ANT1

upper

transceiving

ANT_RXB

upper

ANT2

lower

CPRI0

lower

CPRI0

upper

CPRI1

upper

CPRI1

lower

RX_INB

upper

Rx_1 in

RF signals CPRI

Interconnection port for RF

Rx_1 out

Receive signals RX_OUTA

lower

Rx_2 in Rx_2 out

Monitoring port

MON

existence


nonexistence ——

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LEDs on the GRFU panel  LEDs on the GRFU panel 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

The module is running properly.

0.2s ON, 0.2s OFF

The software is being loaded to the module.

1s ON, 1s OFF

A fault alarm is generated.

OFF

No alarm is generated.

ON

The module is functional and is correctly connected to the BBU.

OFF

The connection with the BBU is not set up.

OFF

No VSWR alarm is generated.

ON

The VSWR alarm is generated on the ANT_TX/RX port.

ON (green)

The CPRI link is normal.

ON (red)

The interface module fails to receive signals.

1s ON, 1s OFF (red)

The CPRI link is out of lock.

ON (green)

The CPRI link is normal.

ON (red)

The interface module fails to receive signals.

1s ON, 1s OFF (red)

The CPRI link is out of lock.

ALM

ACT

VSWR

CPRI0

CPRI1

Red

Green

Red

Red/Green

Red/Green


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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. HUAWEI TECHNOLOGIES Co., Ltd.

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Configuration principle Base on Limitation of GRFU  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.


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Configuration principle Base on Limitation of GRFU  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. Carrier of a cell

5

6

7

8

9

10

11

12

GRFU number

2

2

2

2

2

2

2

2

Carrier number for 2 GRFU （Recommendation ）

2+3

3+3

3+4

4+4

4+5

5+5

5+6

6+6

Output power

31W

31W

27W

27W

18W

18W

16W

16W

Carrier number for 2 GRFU （Supportability）

1+4

2+4/1+5

2+5/1+6

3+5/2+6

3+6

4+6

——

——

Output power

27W

27W/18W

18W/16W

18W/16W

16W

16W

——

——

Limitation of Output power HUAWEI TECHNOLOGIES Co., Ltd.

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Configuration principle Base on Limitation of GRFU  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.


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Antenna Configuration Principles of GRFU  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.


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Transmit Mode and Receive Mode of GRFU  Transmit Mode of GRFU  Non-combination

 Receive Mode of GRFU

 2-way RX diversity  1-way RX


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Output power of GRFU  The output power of different configuration is also configured differently.

Frequency bands PGSM 900MHz / GSM1800MHz


Configuration

Output power （GMSK/8PSK）

S1

80W/53W

S2

40W/26W

S3

31W/20W

S4

27W/17W

S5

18W/12W

S6

16W/10W

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Typical configuration of GRFU  Single GRFU (S3-S6)

 DOUBLE_ANTENNA (1TX+2RX)  When a dual-polarized antenna is 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.


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Typical configuration of GRFU  Two GRFUs (S7-S12)

 SINGLE_ANTENNA_DOUBLE_RECEIVER

(1TX + 2RX)  When the cell configuration is from S7 to 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.


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Typical configuration of GRFU  Single GRFU  SINGLE_ANTENNA_SINGLE_RECEIVER

(1TX+1RX)  This scenario is mainly used in indoor coverage.  The ANT_TX/RXA port on GRFU supports the

receiving and transmitting of signals.


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Typical configuration of GRFU  Single GRFU  DOUBLE_ANTENNA_SINGLE_RECEIVER

(1TX+1RX)  This scenario is mainly used in subway.  The ANT_TX/RXA port on GRFU supports

the transmitting of signals.  The ANT_RXB port on GRFU supports the

receiving of signals.


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Data configuration Based on MML  Data configuration of GRFU is similar with that of DRFU.

Start

Add BTS （slave chain）

Modify TRX Device Attribute

Add cell

Set other BTS Attribute

Add TRX（GRFU） End


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Add BTS  Command: ADD BTS  BTS TYPE must set as BTS3900_GSM ；TRX Board Type

must set as GRFU ；Separate Mode must set as：Support； 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;


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Add BTS 基站类型

BBU CPRI port number


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Add BTS Slave Chain  Command: ADD SLAVECHAIN  Example: ADD SLAVECHAIN: IDXTYPE=BYNAME, BTSNAME="BTS3900", INPN=1, DESTNODE=BSC, SRN=0, SN=18, PN=1;

Abis interface board port number


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Add Cell  Command: ADD CELL  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;


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Add Cell

BBU CPRI port number


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Add TRX  Command: ADD TRX  Example: ADD TRX: IDXTYPE=BYNAME, CELLNAME="cell-1", TRXBN=1, TRXTP=GRFU, TRXPN2=0, FREQ=88, RXUName="1", RXUChainNo=1, RXUChainHeadPN=1;


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Modify TRX Device Attribute  Command: MOD TRXDEV  Example: MOD TRXDEV: IDXTYPE=BYNAME, CELLNAME="cell-1", TRXBN=1, TRXPN=0, POWL=10, POWT=DEFAULT, RCVMD=MAINDIVERSITY, SNDMD=DIVERSITY;


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Operation and Maintenance Command  Set RXU Attributes：SET RXUCHAINPARA  Modify name of RXU board：SET RXUNAME  Query parameter of RXU board：LST RXUBP  Query Attributes of RXU link：LST RXUCHAINPARA

 Query topology structure of RXU link ：LST RXUCHAINTPLGY  Set breakpoint of RXU link ：SET BREAKPOINT  Combine two RXU links to a ring：CBN RXUCHAIN  Set breakpoint ：SET BREAKPOINT  Split ring to a link: SPT RXUCHAIN


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Thank you www.huawei.com

Huawei Gsm Grfu Introduction 090220 Issue1.0 b

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