antenna weight management(eran tdd 8.1_02)

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eRAN TDD

Antenna Weight Management

Feature Parameter Description

Issue 02

Date 2015-05-15

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2015. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

customer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,

and recommendations in this document are provided "AS IS" without warranties, guarantees or

representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 02 (2015-05-15) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i
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Contents

1 About This Document.................................................................................................................. 1

1.1 Scope.............................................................................................................................................................................. 1

1.2 Intended Audience..........................................................................................................................................................1

1.3 Change History...............................................................................................................................................................1

2 Overview......................................................................................................................................... 3

2.1 Introduction.................................................................................................................................................................... 4

2.2 Benefits...........................................................................................................................................................................4

3 Principles of Antenna Weights................................................................................................... 5

4 Related Features.............................................................................................................................8

5 NetworkImpact............................................................................................................................. 9

6 Engineering Guidelines for Antenna Weights...................................................................... 10

6.1 When to Use Antenna Weight Management.................................................................................................................11

6.2 Required Information....................................................................................................................................................11

6.3 Planning........................................................................................................................................................................ 11

6.4 Deployment...................................................................................................................................................................11

6.4.1 Requirements............................................................................................................................................................. 11

6.4.2 Data Preparation........................................................................................................................................................ 12

6.4.3 Precautions.................................................................................................................................................................13

6.4.4 Hardware Adjustment................................................................................................................................................13

6.4.5 Initial Configuration.................................................................................................................................................. 13

6.4.6 Activation Observation..............................................................................................................................................156.4.7 MML Command Examples....................................................................................................................................... 15

6.5 Performance Monitoring...............................................................................................................................................15

6.6 ParameterOptimization................................................................................................................................................15

6.7 Troubleshooting............................................................................................................................................................16

7 Parameters.....................................................................................................................................17

8 Counters........................................................................................................................................ 21

9 Glossary.........................................................................................................................................22

10 Reference Documents...............................................................................................................23

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Antenna Weight Management Feature Parameter

Description Contents



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1About This Document

1.1 Scope

This document describes antenna weights, including technical principles, related features,

parameter adjustments, network impact, and engineering guidelines.

1.2 Intended Audience

This document is intended for personnel who:

l Need to understand the features described herein

l Work with Huawei products

1.3 Change History

This section provides information about the changes in different document versions. There are

two types of changes:

l Feature change

Changes in features and parameters of a specified version as well as the affected entities.

l Editorial changeChanges in wording or addition of information and any related parameters affected by

editorial changes. Editorial change does not specify the affected entities.

eRAN TDD 8.1 02 (2015-05-15)

This issue includes the following changes.

Change Type Change Description ParameterChange

Feature change None None

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Editorial change Added descriptions on configurations of antenna

weight amplitude. For details, see 6.1 When to

Use Antenna Weight Management.

None

eRAN TDD 8.1 01 (2015-03-20)

This issue does not include any changes.

eRAN TDD 8.1 Draft B (2015-02-25)

This issue includes the following changes.



Editorial change l Modified the impact on the network

performance. For details, see 5 Network

Impact.

l Modified the method of observing the

activation of antenna weight management. For

details, see 6.4.6 Activation Observation.

l Revised some descriptions.

None

eRAN TDD 8.1 Draft A (2015-01-15)

Compared with Issue 01 (2014-09-30) of eRAN TDD 8.0, Draft A (2015-01-15) of eRAN

TDD 8.1 includes the following changes.



Editorial change Revised some descriptions. None

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2OverviewThis document describes antenna weights.

An antenna weight is also known as a broadcast beam weight. It is used to quantify specific

excitation signals transported to each antenna port so that an expected coverage pattern can be

formed.

Antenna weights only apply to 8T8R smart antennas. This chapter provides the definition of

antenna weights and describes the benefits offered by antenna weights.

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2.1 Introduction

An antenna weight is used to quantify specific excitation signals transported to each antenna

port so that an expected coverage pattern can be formed.

The antenna weight is represented by amplitude or phase.

l The amplitude is expressed by normalized voltage Ui, current Ii, or power. The square of

the amplitude represented by normalized voltage or current equals the amplitude

represented by normalized power.

l The phase is expressed as an angle. The antenna weight format must meet the

requirements of the operation and maintenance center (OMC). If the format does not

meet the requirements, the format must be converted into the required format before

being imported into the OMCs of certain manufacturers.

If an 8T8R smart antenna is used, amplitudes and phases for eight channels must beconfigured on the eNodeB side. That is, eight antenna weight groups must be configured,

which are used to form beam patterns that meet the broadcast and control channel coverage

requirements.

2.2 Benefits

Each antenna port is configured with specific antenna weights to achieve optimal antenna

coverage and therefore improve user experience.

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3Principles of Antenna WeightsAntennas are classified into omnidirectional and directional antennas according to the

horizontal direction pattern and classified into single-polarized and dual-polarized antennas

according to polarization characteristics. In most cases, omnidirectional antennas are single-

polarized antennas while directional antennas can be either single-polarized or dual-polarized

antennas.

An omnidirectional antenna radiates the same radio wave power in all directions on the

horizontal plane and radiates different radio wave power in different directions on the vertical

plane. A directional antenna radiates different radio wave power in any directions on the

horizontal and vertical planes.

Most single-polarized antennas are vertical polarization antennas, with antenna elements

vertically polarized, as shown in Figure 3-1. However, most dual-polarized antennas are +45

or -45 polarization antennas, with antenna elements +45 or -45 polarized, as shown inFigure 3-2.

Figure 3-1Single-polarized antenna

Figure 3-2Dual-polarized antenna

The broadcast beam weights for single-polarized antennas are symmetrically distributed. Forexample, the broadcast beam weights are identical or similar between ports 1 and 8, ports 2

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and 7, ports 3 and 6, and ports 4 and 5. Table 3-1lists an example of antenna weights for

single-polarized antennas.

Table 3-1Antenna weights for single-polarized antennas

Antenna

Port

Number

1 2 3 4 5 6 7 8

Amplitude

Ii

0.50 0.95 1 1 1 1 0.95 0.50

Phase 128 -143 -62 -31 -31 -62 -143 128

The antenna weights for dual-polarized antennas are not symmetrically distributed. The first

four ports and the last four ports have the same distribution of antenna weights. Table 3-2lists

an example of antenna weights for dual-polarized antennas.

Table 3-2Antenna weights for dual-polarized antennas

Antenna

Port

Number

1 2 3 4 5 6 7 8

Amplitude

Ii

0.50 1 1 0.49 0.50 1 1 0.49

Phase 0 100 100 105 0 100 100 105

Provided by antenna manufacturers, antenna weights are used to change the broadcast

beamwidth (30, 65, or 90) to meet various cell coverage requirements.

l Antenna weights vary with antenna manufacturers and antenna types. Therefore, antenna

weights provided by one manufacturer cannot apply to antennas of the other

manufacturer, and antenna weights of one type of antenna cannot apply to antennas of

the other type. Otherwise, cell coverage is negatively affected.

NOTE

The element pattern in an array varies with antennas from different manufacturers due to different

internal mechanisms. In broadcast beams, all element patterns are superimposed in a vector manner after

they are weighted. Due to the different element patterns, broadcast beam weights are different for each

antenna manufacturer.

l Broadcast beams with different widths are generated if different broadcast beam weights

are applied to an antenna. A broadcast beam can then be dynamically adjusted using

software without replacing the hardware. By applying these weight groups on a

broadcast beam, an antenna transmits different beams, probably in different patterns. All

weight groups may be correct, but only one group is optimal.

Table 3-3lists the weights of a broadcast beam with the beamwidth of 65for dual-polarizedantennas. Figure 3-3shows the pattern for the broadcast beam.

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Table 3-3Weights of a broadcast beam with the beamwidth of 65 for dual-polarized

antennas

Antenn

a Port

Number

1 2 3 4 5 6 7 8

Amplitu

de Ii

0.53 1 1 0.53 0.53 1 1 0.53

Phase -100 0 0 -100 -100 0 0 -100

Figure 3-3Pattern for the broadcast beam with the beamwidth of 65 for dual-polarized

antennas

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4Related FeaturesPrerequisite Features

None

Mutually Exclusive Features

None

Impacted Features

None

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5Network ImpactSystem Capacity

No impact.

Network Performance

Adjustment of antenna weights affects the cell coverage and causes changes in the network

KPIs. You are advised to use the weight files provided by the antenna manufacturer for

antenna weight adjustment.

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6Engineering Guidelines for AntennaWeights

This chapter provides engineering guidelines for antenna weight management.

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6.1 When to Use Antenna Weight Management

Antenna weights apply to all 8T8R smart antennas, including those with built-in RAE chips.

With the antenna weight parameters provided by manufacturers, the broadcast beamwidth can

be changed to meet the cell coverage requirements. The configuration of antenna weights is

planned by operators.

NOTE

Do not set amplitude of all antenna weights to 0. Otherwise, activation of a deactivated cell will fail.

Setting amplitude of an antenna weight to 0 affects the cell coverage performance.

A broadcast beam with a horizontal beamwidth of 65 can optimize cell coverage, and

therefore the broadcast beamwidth is adjusted to 65. Huawei eNodeBs support the antennas

whose broadcast beamwidth can be adjusted to 65 by using antenna weights and the antennas

with a fixed beamwidth of 65.

l If an antenna with a beamwidth of a single array element to be 65 is used, the antenna

weights have been configured by default before delivery, and on-site configuration of

antenna weights is unnecessary.

l If an antenna with a beamwidth of a single array element to be 90 is used, the antenna

weights must be configured on-site to adjust the broadcast beamwidth to 65.

6.2 Required Information

Before configuring antenna weights, collect the antenna information including the antenna

manufacturer, frequency band, downtilt, beamwidth of the antenna element, broadcast

beamwidth, and antenna weight.

6.3 Planning

None

6.4 Deployment

6.4.1 RequirementsOperating Environment

If the antenna weight file provided by the antenna manufacturer is used, FTP software must

be installed on the PC running the U2000 client or the Web LMT.

Cells with this feature enabled must be 8T8R cells. Configuration requirements of this feature

are as follows:

l For BBU3900 or BBU3910, the BBP.WMparameter must be set to TDD_8T8Rfor

LBBPs but does not need to be specified for UBBPd boards.

l

For BBU3910A, the BBP.WMparameter does not need to be specified for UMDUboards.

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l The CELL.TxRxModeparameter must be set to 8T8R.

Hardware

None

Other NEs

None

License

None

6.4.2 Data Preparation

The following table describes the parameters that must be set in a BFANTMO.

ParameterName

ParameterID

Setting Notes DataSource

Device

No.

BFANT.Dev

iceNo

Specifies the device number of the beamforming

antenna. Set this parameter based on the network

plan.

Equipment

plan

Manufact

ory

BFANT.Ma

nufactory

Indicates the manufacturer of the beamforming

antenna.

Equipment

plan

Connect

RRU

subrack

No.

BFANT.Co

nnSRN

Specifies the subrack number of the RRU to

which the beamforming antenna is connected. Set

this parameter to the number of the subrack

housing the added RRU.

Equipment

plan

Antenna

model

number

BFANT.Mo

delNo

Specifies the beamforming antenna model. Set

this parameter based on information about the

antenna.

Equipment

plan

Tilt BFANT.Tilt Specifies the beamforming antenna tilt. Set this

parameter based on information about the

antenna.

Network

plan

Beamwid

th

BFANT.BE

AMWIDTH

Indicates the beamwidth formed after

beamforming. Set this parameter based on

information about the antenna.

Network

plan

Band BFANT.Ba

nd

Specifies the frequency band on which the

beamforming antenna operates. Set this

parameter based on information about the

antenna.

Network

plan

Antenna

Type

BFANT.TY

PE

Indicates the antenna type. This parameter is used

only when the NE protocol type is TDL_IR.

Equipment

plan

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6.4.3 Precautions

None

6.4.4 Hardware AdjustmentThis feature deployment requires proper connections between antennas and RRUs. Figure 6-1

shows connections between antenna ports and RRU ports in the case of eight antennas.

Figure 6-1Eight-antenna cross-polarization mapping

6.4.5 Initial Configuration

Method 1 (Recommended)

In 8T8R scenarios, the weight file contained in the software package provided by Huawei can

be used for initial configuration.

Step 1 On the U2000 client or LMT, run the DSP BRDVERcommand to query the slot number andsubrack number of an RRU.

Step 2 Run the ACT BFANTDBcommand to activate the antenna weight file.

Step 3 Run the ADD BFANTcommand to add an antenna.

----End

Method 2

In 8T8R scenarios, the antenna weight file provided by the antenna manufacturer can be used

for initial configuration.

Step 1 Contact Huawei technical support engineers to download the file for configuring antennaweights.

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NOTE

The Weight Maintenance Tool.xlsfile is used to configure antenna weights. To obtain the Weight

Maintenance Tool.xlsfile, perform the following steps:

1. Log in to http://support.huawei.com.

2. In the Software area, choose Software >Wireless Network > Wireless Network Common >SingleRAN >BTS3900.

3. Select the software version and download the Weight Maintenance Tool.xlsfile.

Step 2 Set the macro security level of an Excel template.

Excel 2003 Excel 2007

1. On the menu bar, choose Tools >Macro

>Security. A dialog box for setting a

macro security level is displayed.

2. On the Security Leveltab page, set the

security level to Low.3. Click OKto save the setting and close

the Excel file.

1. Click the office button in the upper left

corner. At the bottom of the displayed

menu, click Excel Options. The Excel

Optionsdialog box is displayed.

2. Click Trust Centerand then click TrustCenter Settings. The Trust Center

dialog box is displayed.

3. In the Trust Centerdialog box, select

Macro Settingsand then Enable all

macros. Click OK.

4. Click Add-Inson the menu bar to check

the enabled macros.

Step 3 Open Weight Maintenance Tool.xls, and set the weight parameters in the Antenna Weight

Databasesheet.

NOTE

The GUI value range of the weight parameters is from 0 to 100, and the actual value range is from 0 to

1. The parameter values related to the signal phase are measured in degrees.

Step 4 On the Tool for Exportingsheet, click Exportto export the antenna weight file in XMLformat to the FTP server.

1. Click Clear and Reselect.

2. Set the antenna model, tilt angle, beamwidth, and frequency band.

3. Click OK and Query.

The weight information of all the selected antennas is displayed in the Query Resultarea at the bottom of the sheet.

4. Verify that the weight information is correct, and then click Exportto generate an

antenna weight file.

NOTE

If the antenna weight file in XML format is already available, open it and change the weight or phase

directly.

Step 5 On the U2000 or LMT, run the DLD BFANTDBcommand to download the antenna weightfile from the FTP server to the eNodeB.

Step 6 On the U2000 or LMT, run the ACT BFANTDBcommand to activate the antenna weightfile.

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Step 7 On the U2000 or LMT, run the ADD BFANTcommand to add an antenna.

----End

6.4.6 Activation ObservationStep 1 Run the DSP BFANTcommand to check whether the antenna weights of cells have taken

effect.

l If the parameters Amplitude Offset of Physical Port 1 for CRS1through Amplitude

Offset of Physical Port 1 for CRS8and Phase of Physical Port 1 for CRS1through

Phase of Physical Port 1 for CRS8are set to the expected values (instead of NULL) in

the command output, the antenna weights of cells have taken effect.

l If the parameters Amplitude Offset of Physical Port 1 for CRS1through Amplitude

Offset of Physical Port 1 for CRS8and Phase of Physical Port 1 for CRS1through

Phase of Physical Port 1 for CRS8are NULLin the command output, the antenna

weights of cells have not taken effect.

----End

6.4.7 MML Command Examples

l Method 1: using the antenna weight file contained in the software package

//Querying the slot number and subrack number of an RRU

DSP BRDVER:;

//Activating the antenna weight file contained in the software package

ACT BFANTDB: OPMODE=SWFILE;

//Adding an antenna

ADD BFANT: DEVICENO=0, Manufactory=Andrew, CONNSRN=60,

MODELNO="t551", TILT=4, BEAMWIDTH=65, Band=41;

l Method 2: using the antenna weight file provided by the antenna manufacturer

//Downloading the weight database file for a beamforming antenna to an eNodeB

DLD BFANTDB: IP="192.168.57.120", USR="admin", PWD="****",

SRCF="exAntenna.xml";

//Activating the weight database file for a beamforming antenna

ACT BFANTDB:OPMODE=DLDFILE;

//Adding an antenna

ADD BFANT: DEVICENO=0, Manufactory=Andrew, CONNSRN=60,

MODELNO="t551", TILT=4, BEAMWIDTH=65, Band=41;

6.5 Performance Monitoring

None

6.6 Parameter Optimization

None

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6.7 Troubleshooting

None

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7ParametersTable 7-1Parameters

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

BBP WM ADD

BRD

MOD

BBP

LST

BBP

None None Meaning: Indicates the working mode of the baseband

processing board. There are seven working modes:

FDD, TDD, HYBRID, TDD_ENHANCE,

TDD_8T8R, TDD_TL and FDD_ATG. The

Frequency Division Duplex (FDD) mode carries the

traditional voice and data services. TDD is short for

Time Division Duplex. The HYBRID mode is a

combination of FDD and IMB modes. In IntegratedMobile Broadcasting (IMB) mode, the baseband

processing board carries the mobile TV services. The

value TDD_ENHANCE indicates the TDD mode

integrated with the BeamForming (BF) function. The

BF function provides the data transmission service in

transmission modes 7 and 8 defined in protocols. For

details, see 3GPP TS 36.213. In TDD_8T8R mode,

the baseband processing board supports TD-LTE

single-mode 8T8R. In addition, the baseband

processing board supports the BF function and CPRI

specifications are applied between the BBU and RRU.

In TDD_TL mode, the baseband processing boardsupports the TD-LTE&TDS-CDMA dual mode and

the TD-LTE single mode. In addition, the baseband

processing board supports 8T8R BF and 2T2R

Multiple-Input Multiple-Output (MIMO) and CMCC

TD-LTE IR specifications are applied between the

BBU and RRU. In FDD_ATG mode, the baseband

processing board supports communication between

Air and Ground. The FDD_ATG mode applies only to

communication between air and ground.

GUI Value Range: FDD(Frequency Division Duplex),

TDD(Time Division Duplex), HYBRID(HYBRID),

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDD_ENHANCE(Support TDD BF),

TDD_8T8R(Support CPRI ports), TDD_TL(Support

CMCC TDS and TDL dual modes),

FDD_ATG(Support air-ground communication)

Actual Value Range: FDD, TDD, HYBRID,

TDD_ENHANCE, TDD_8T8R, TDD_TL, FDD_ATG

Unit: None

Default Value: FDD(Frequency Division Duplex)

Cell TxRxM

ode

ADD

CELL

MODCELL

LST

CELL

None None Meaning: Indicates the transmission and reception

mode of the cell.

GUI Value Range: 1T1R, 1T2R, 2T2R, 2T4R, 4T4R,8T8R, 2T8R, 4T8R

Actual Value Range: 1T1R, 1T2R, 2T2R, 2T4R,

4T4R, 8T8R, 2T8R, 4T8R

Unit: None

Default Value: None

BfAnt DEVIC

ENO

ADD

BFANT

DSP

BFANT

LSTBFANT

MOD

BFANT

RMV

BFANT

DSP

BFANT

DB

None None Meaning: Indicates the device number of the BF

antenna, it uniquely identifies a RET within an

eNodeB.

GUI Value Range: 0~35

Actual Value Range: 0~35

Unit: None

Default Value: None

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

BfAnt Manufac

tory

ADD

BFANT

MOD

BFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

None None Meaning: Indicates the manufacturer of the BF

antenna.

GUI Value Range: Andrew(Andrew),

TongYu(TongYu), HaiTian(HaiTian),

COMBA(COMBA), TTCOM(TTCOM),

MOBI(MOBI), GUOXIN(GUOXIN),

JIESAI(JIESAI), OtherManufactur-

er1(OtherManufacturer1), OtherManufactur-

er2(OtherManufacturer2), OtherManufactur-

er3(OtherManufacturer3),

HuaweiAgisson(HuaweiAgisson),

ShengLu(ShengLu), HongXin(HongXin)

Actual Value Range: Andrew, TongYu, HaiTian,

COMBA, TTCOM, MOBI, GUOXIN, JIESAI,

OtherManufacturer1, OtherManufacturer2,

OtherManufacturer3, HuaweiAgisson, ShengLu,

HongXin

Unit: None

Default Value: OtherManufacturer1(OtherManufactur-

er1)

BfAnt CONNS

RN

ADD

BFANT

MODBFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

LOFD-0

01024 /

TDLOFD-00102

4

Remote

Electrica

l TiltControl

Meaning: Indicates the subrack number of the RRU

connecting to the BF antenna.



Unit: None

Default Value: None

BfAnt MODEL

NO

ADD

BFANT

MOD

BFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

LOFD-0

01024 /TDLOF

D-00102

4

Remote

Electrical Tilt

Control

Meaning: Indicates the model of the BF antenna. Set

this parameter to RAE if the antenna weight must bequeried based on the RAE. RAE is case-insensitive.

GUI Value Range: 0~128 characters

Actual Value Range: 0~128 characters

Unit: None

Default Value: NULL(empty string)

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

BfAnt TILT ADD

BFANT

MOD

BFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

None None Meaning: Indicates the configured tilt of the BF

antenna.



Unit: degree

Default Value: 0

BfAnt BEAM

WIDTH

ADD

BFANT

MOD

BFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

None None Meaning: Indicates the beamwidth formed after

beamforming.

GUI Value Range: 30,65,90,360

Actual Value Range: 30,65,90,360

Unit: degree

Default Value: 30

BfAnt Band ADD

BFANT

MOD

BFANT

DSP

BFANT

DSP

BFANT

DB

LST

BFANT

None None Meaning: Indicates the frequency band in which the

BF antenna operates.



Unit: None

Default Value: 33

BfAnt TYPE ADD

BFANT

MOD

BFANT

LST

BFANT

None None Meaning: Indicates the type of the BF antenna.

GUI Value Range: INTELLIGENT, DISTRIBUTED

Actual Value Range: INTELLIGENT,

DISTRIBUTED

Unit: None

Default Value: INTELLIGENT

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8CountersThere are no specific counters associated with this feature.

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9GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.

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10Reference DocumentseNodeB Alarm Reference

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Description 10 Reference Documents