Huawei gsm grfu introduction

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Security Level: Internal Use

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2009-02

HUAWEI GSM GRFUIntroduction

Wireless Case and Training

ISSUE1.0

HUAWEI TECHNOLOGIES CO., LTD. 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.

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

Know the hardware principle and structure of GRFU.

Master the typical configuration of GRFU.

Master the data configuration of GRFU.


Chapter 1 Principle and function of GRFU Chapter 1 Principle and function of GRFU

Chapter 2 Typical configuration of GRFU

Chapter 3 Data configuration of GRFU


Multi-Carrier Technology The principle of multi-carrier technology: multiple carriers share one

power amplifier and one RF channel.

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.

Multi-carrier TechnologySingle-carrier Technology


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.


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.


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.

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

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


Logical structure of the GRFU

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

processing unit, power amplifier, and duplexer.

PA

LNA

LNARX signal processing unit

TX signal processing unit

hig

h-speed

interface unit

CPRI

BBU

TX/RXA

RXB

RX OUTA

RX INB

GRFU

DUP

TRX


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

transceiving

RF signals

ANT_RXB DIN connector Connecting to the antenna subsystem.

ANT_TX/RXA

CPRI CPRI0 SFP female connector Connecting to the BBU, or the upper-level RFU during the cascading.

CPRI1 Connecting to the lower-level RFU during the cascading.

Interconnection

port for RF

Receive signals

RX_INB QMA female

connector

Input port of diversity signals in theantenna channel.

RX_OUTA Output port of diversity signals in theantenna channel.

Power supply

port

PWR 3V3 power connector Feeding power.

Monitoring port MON RJ45 connector RS485 Monitoring 、 debugging port.


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

transceiving

RF signals

ANT_TX/RXA lower ANT1 upper

ANT_RXB upper ANT2 lower

CPRI CPRI0 lower CPRI0 upper

CPRI1 upper CPRI1 lower

Interconnection

port for RF

Receive signals

RX_INB upper Rx_1 in

Rx_1 out

RX_OUTA lower Rx_2 in

Rx_2 out

Monitoring port MON existence nonexistence ——


LEDs on the GRFU panelLED 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.

ALM Red 1s ON, 1s OFF A fault alarm is generated.

OFF No alarm is generated.

ACT Green ON The module is functional and is correctly connected to the BBU.

OFF The connection with the BBU is not set up.

VSWR Red OFF No VSWR alarm is generated.

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

CPRI0 Red/Green 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.

CPRI1 Red/Green 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.

LEDs on the GRFU panel


Chapter 1 Principle and function of GRFU

Chapter 2 Typical configuration of GRFUChapter 2 Typical configuration of GRFU

Chapter 3 Data configuration of GRFU


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.


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.


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


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.


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.


Transmit Mode and Receive Mode of GRFU

Transmit Mode of GRFU Non-combination

Receive Mode of GRFU 2-way RX diversity

1-way RX


Output power of GRFU

The output power of different configuration is also configured differently.

Frequency bands Configuration Output power（ GMSK/8PSK ）

PGSM 900MHz / GSM1800MHz

S1 80W/53W

S2 40W/26W

S3 31W/20W

S4 27W/17W

S5 18W/12W

S6 16W/10W


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.



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.



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.



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.


Chapter 1 Principle and function of GRFU

Chapter 2 Typical configuration of GRFU

Chapter 3 Data configuration of GRFUChapter 3 Data configuration of GRFU


Data configuration Based on MML

End

Start

Add BTS（ slave chain ）

Add cell

Add TRX （ GRFU ）

Modify TRX Device Attribute

Set other BTS Attribute

Data configuration of GRFU is similar with that of DRFU.


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;


Add BTS

基站类型

BBU CPRI port number


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


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;


Add Cell

BBU CPRI port number


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;


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;


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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Huawei gsm grfu introduction

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