Anti-Imbalance of the Different Antenna(RAN15.0_01)

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WCDMA RAN

Anti-Imbalance of the Different

Antenna Feature Parameter

Description

Issue 01

Date 2013-04-28

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2013. 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 the

purchase 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 01 (2013-04-28) 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.........................................................................................................................................2

3 Related Features.............................................................................................................................3

4 NetworkImpact.............................................................................................................................5

5 Engineering Guidelines...............................................................................................................6

5.1 When to Use...................................................................................................................................................................6

5.2 Required Information.....................................................................................................................................................6

5.3 Deployment....................................................................................................................................................................7

5.3.1 Requirements...............................................................................................................................................................7

5.3.2 Data Preparation..........................................................................................................................................................7

5.3.3 Precautions...................................................................................................................................................................8

5.3.4 Activation....................................................................................................................................................................8

5.3.5 Activation Observation................................................................................................................................................9

5.3.6 Deactivation.................................................................................................................................................................9

5.4 Performance Monitoring...............................................................................................................................................10

5.5 ParameterOptimization................................................................................................................................................11

5.6 Troubleshooting............................................................................................................................................................11

6 Parameters.....................................................................................................................................12

7 Counters........................................................................................................................................13

8 Glossary.........................................................................................................................................14

9 Reference Documents.................................................................................................................15

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Anti-Imbalance of the Different Antenna Feature Parameter

Description Contents



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1About This Document

1.1 Scope

This document describes Anti-Imbalance of the Different Antenna, including its technical

principles, related features, 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, which are defined as follows:

l Feature change

Changes in features of a specific product version

l Editorial change

Changes in wording or addition of information that was not described in the earlier version

01 (2013-04-28)

This document is created for RAN15.0.

Contents of the document are moved fromLoad Control Feature Parameter Description.

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2OverviewAnti-Imbalance of the Different Antenna helps address shrinking uplink coverage and reduced

system capacity in multi-antenna scenarios. When a base station uses multiple antennas, these

antennas may cause interference to each other. If antenna interference is imbalanced, the

measured RTWP may be inaccurate. This feature corrects the inaccurate RTWP values and

therefore reflects the actual cell load. In this way, system capacity and network coverage can be

better balanced.

This feature is controlled by the ANTIANTENNAIMBALANCESWparameter on the NodeB

side.

For details about load measurement, seeLoad Control Feature Parameter Description.

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3Related FeaturesPrerequisite Features

None.

Mutually Exclusive Features

This feature is mutually exclusive of WRFD-021350 Independent Demodulation of Signals from

Multiple RRUs in One Cell.

Impacted Features

This feature corrects the RTWP. Correction of the measured RTWP affects the following

features using the measurement results in a cell:

l WRFD-020101 Admission Control

l WRFD-01061202 HSUPA Power Control

l WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in Node B

l WRFD-01061402 Enhanced Fast UL Scheduling

l WRFD-020136 Anti-Interference Scheduling for HSUPA

l WRFD-010691 HSUPA UL Interference Cancellation

l WRFD-020137 Dual-Threshold Scheduling with HSUPA Interference Cancellation

l WRFD-010210 Control Channel Parallel Interference Cancellation (CCPIC)

l WRFD-140202 Control Channel Parallel Interference Cancellation (Phase 2)

l WRFD-020106 Load Reshuffling

l WRFD-020107 Overload Control

l WRFD-140217 Inter-Frequency Load Balancing Based on Configurable Load Threshold

l WRFD-020402 Measurement Based Direct Retry

l WRFD-070004 Load Based GSM and UMTS Handover Enhancement Based on Iur-g

l WRFD-070006 GSM and UMTS Load Balancing Based on Iur-g

l WRFD-140213 Intelligent Access Class Control

l WRFD-010712 Adaptive Configuration of Traffic Channel Power offset for HSUPA

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l WRFD-140215 Dynamic Configuration of HSDPA CQI Feedback Period

l WRFD-140216 Load-based Uplink Target BLER Configuration

l WRFD-010641 HSUPA Adaptive Transmission

For details about the impact, see section 4 Network Impact.

This feature corrects only real-time RTWP values not delayed RTWP values. Therefore, the

calculated interference cancellation efficiency is inaccurate. In addition, after this function takes

effect and the following features are enabled, the value of the VS.HSUPA.Ic.MeanEff counter

becomes 0 or less than that before this fucntion takes effect:

l WRFD-020137 Dual-Threshold Scheduling with HSUPA Interference Cancellation

l WRFD-010210 Control Channel Parallel Interference Cancellation (CCPIC)

l WRFD-140202 Control Channel Parallel Interference Cancellation (Phase 2)



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4Network ImpactThis function impacts system capacity and network performance duirng call admission and

during a call, which is described as follows:

l During call admission

If interference is imbalanced between antennas, enabling the function reduces the uplink

admission failure rate, improves the access success rate, and increases the number of online

users.

l During a call

If WRFD 020136 Anti-Interference Scheduling for HSUPA is disabled,

If interference is imbalanced between antennas, enabling this function improves

HSUPA cell throughout if data source is sufficient.

If WRFD 020136 Anti-Interference Scheduling for HSUPA is enabled,

In the case of imbalanced interference between antennas, this feature corrects the

measured RTWP. This will reduce the effective probability of anti-interference

scheduling and increase the HSUPA cell throughout when anti-interference scheduling

does not take effect. This feature in general improves the HSUPA cell throughput.

l In scenario of imbalanced interference between antennas, this feature improves the capacity

but reduces the coverage. As a result, the call drop rate increases.

l With this function, the NodeB CPU usage increases. However, the increase is not noticeable

because the load on a CPU with a 1 GHz main frequency is only 0.001%.

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5Engineering Guidelines

5.1 When to Use

Use the anti-imbalance of the different antenna function in multi-antenna scenarios to address

shrinking uplink coverage and reduced uplink capacity caused by imbalanced antenna

interference. Imbalanced antenna interference is caused by improper installation or aging

antennas.

It is recommended that this function be enabled for multi-antenna scenarios with intermodulation

interference.

Do not enable this function for multi-RRU cells, including cells with the 0.5/0.5 configuration

mode, the distributed sector configuration mode, or independent demodulation of signals from

multiple RRUs in one cell. Multi-RRU cells are often used for highway and tunnel coverage.

5.2 Required Information

Perform the following steps to determine whether there is intermodulation interference in a cell:

Step 1 Observe the values of the following counters to determine whether there is intermodulationinterference:

l On the NodeB side (mean RTWP of a specific antenna):

VS.MeanRTWP.Locell.SectorEqm.Ant0




l On the NodeB side (average ratio of valid antennas):

VS.ValidAntRatio.Mean

l On the RNC side (mean RTWP of a cell):

VS.MeanRTWP

Intermodulation interference exists when the following conditions are true:

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l The values of RTWP counters between antennas on the NodeB side is greater than or equal

to 6 dB.

l The values of RTWP counters on the RNC side is 6 dB higher than the background noise.

The background noise varies according to networks.

l The value of NodeB counter VS.ValidAntRatio.Mean is less than 1.

Step 2 If the difference between the values of the preceding counters on the NodeB side is greater thanor equal to 6 dB, check the settings of radio frequency (RF) channel-related parameters (such

as attenuation or RTWP initial rectification value) to ensure that the difference is not caused by

improper parameter settings or faulty tower mounted amplifiers (TMAs). Then determine

whether to enable the anti-imbalance of the different antenna function.Enable this function only

when high RTWPs are caused by intermodulation interference.

Step 3 Collect the following RNC counters and KPIs in a cell before feature activation to observe theeffect of this function:

l KPIs: CS RAB setup success rate, PS RAB setup success rate, CS call drop rate, and PS call

drop rate

l Counters: VS.HSUPA.MeanChThroughput, VS.HSUPA.MeanBitRate,

VS.HSUPA.MeanBitRate.WithData, VS.MeanULActualPowerLoad,

VS.ValidAntRatio.Mean, and VS.MeanRTWP

----End

5.3 Deployment

5.3.1 RequirementsHardware

l The BTS3812E, BTS3812A, and BTS3812AE do not support this function.

l The DBS3800 does not support this function.

l 3900 series base stations do not support this function if configured with the WBBPa board

or the 20 W RRU3801C.

5.3.2 Data Preparation

Table 5-1lists the data to prepare before enabling this function.

Table 5-1Data to prepare before enabling this function

Parameter Name Parameter ID Setting Notes Data Source

Anti-Antenna

Imbalance

Algorithm Switch

ANTIANTENNAI

MBALANCESW

Enable this function

if information in

section 5.2 Required

Informationmeets

the requirements in

section 5.1 When to

Use

Default value/

Recommended value

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5.3.3 Precautions

5.3.4 Activation

Using MML Commands

Run the NodeB MML command SET ULOCELLALGPARAwith Anti-Antenna Imbalance

Algorithm Switchset to ON(ON).

MML Command Examples

//Enabling the anti-imbalance of the different antenna function

SET ULOCELLALGPARA: ANTIANTENNAIMBALANCESW=ON;

Using the CME

NOTE

l When configuring the feature on the CME, perform a single configuration first, and then perform a

batch modification if required.

l Configure the parameters of a single object before a batch modification. Perform a batch modification

before logging out of the parameter setting interface.

Step 1 Configure a single object (such as a cell) on the CME.

Set parameters on the CME according to the operation sequence described in Table 5-2. For

instructions on how to perform the CME single configuration, see CME Single Configuration

Operation Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects in batches, click on the CME to start the batch modification wizard. For

instructions o how to perform a batch modification through the CME batch modification center,

press F1on the wizard interface to obtain online help.

----End

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Table 5-2Configuring parameters on the CME

SN MO NE ParameterName

ParameterID

Configurable in CMEBatchModification Center

1 ULOCELL

ALGPARA

NodeB Anti-

Antenna

Imbalance

Algorithm

Switch

ANTIANTE

NNAIMBA

LANCESW

Yes

5.3.5 Activation Observation

Step 1 Run the NodeB MML command LST ULOCELLALGPARAto check whether this functionis enabled.

Step 2 Query the value of the VS.MeanRTWP counter on the RNC side.

Expected result: After this function is enabled, the value of this counter is smaller than or equal

to the value before the enabling of this function.

----End

5.3.6 Deactivation

Using MML Commands

Run the NodeB MML command SET ULOCELLALGPARAwith Anti-Antenna Imbalance

Algorithm Switchset to OFF(OFF).

MML Command Examples

//Disabling the anti-imbalance of the different antenna function

SET ULOCELLALGPARA: ANTIANTENNAIMBALANCESW=OFF;

Using the CME

NOTE

l When configuring the feature on the CME, perform a single configuration first, and then perform a

batch modification if required.

l Configure the parameters of a single object before a batch modification. Perform a batch modification

before logging out of the parameter setting interface.

Step 1 Configure a single object (such as a cell) on the CME.

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Set parameters on the CME according to the operation sequence described inTable 5-3. For

instructions on how to perform the CME single configuration, see CME Single Configuration

Operation Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects in batches, click on the CME to start the batch modification wizard. For

instructions o how to perform a batch modification through the CME batch modification center,

press F1on the wizard interface to obtain online help.

----End

Table 5-3Configuring parameters on the CME

SN MO NE Parameter Name

Parameter ID Configurable in

CMEBatchModification Center

1 ULOCELLALGP

ARA

Node

B

Anti-

Antenna

Imbalance

Algorithm

Switch

ANTIANTENNAIMBA-

LANCESW

Yes

5.4 Performance Monitoring

After this function is enabled, perform the following steps to monitor the performance of this

function:

Step 1 Check whether this function takes effect by monitoring counters listed in Table 5-4.

This function takes effect if the value of the VS.MeanRTWP counter on the RNC side is smaller

than or equal to the values before the enabling of this function.

Table 5-4RTWP-related counters during busy hours

Counter Name Description

VS.MeanRTWP Mean Power of Totally Received Bandwidth

for Cell

Step 2 Monitor the performance of this function.

l Query the value of the VS.HSUPA.MeanChThroughput counter during busy hours to

determine whether the average HSUPA throughout in a cell increases.

After this function is enabled, the average HSUPA throughput in a cell increases when

antenna interference is imbalanced.

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After this function is enabled, the average HSUPA throughput in a cell decreases when

some antennas become invalid and the WRFD-020136 Anti-Interference Scheduling for

HSUPA feature is activated.

If the average HSUPA throughput does not increase when antenna interference is

imbalanced, the live network may not meet the requirements in section5.1 When toUse or the traffic volume is too small so that the gains provided by this function are not

noticeable.

l Monitor the CS RAB Setup Success Ratio and PS RAB Setup Success Ratio KPIs during

busy hours to determine whether the access success rate increases.

After this function is enabled, the access success rate increases when antenna interference

is imbalanced and the RTWP-based anti-interference function is disabled; the access

success rate decreases when antenna interference is imbalanced and the RTWP-based

anti-interference function is enabled.

After this function is enabled, the access success rate decreases when some antennas

become invalid and the RTWP-based anti-interference function is enabled.

l Monitor the CS Service Drop Ratio and PS Call Drop Ratio KPIs to observe whether the call

drop rate increases.

After this function is enabled in the scenario of imbalanced antenna intereference, the

throughput increases, the coverage shrinks and the call drop rate deteriorates. You are

advised to disable this function if the call drop rate deteriorates seriously.

----End

5.5 Parameter Optimization

None

5.6 Troubleshooting

None

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6ParametersTable 6-1Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

ANTIANTENN

AIMBALANC

ESW

BTS3900 SET

ULOCELLALG

PARA

LST

ULOCELLALG

PARA

None None Meaning:Indi-

cates whether to

enable anti-

antenna

imbalance. If

this switch is

turned on, the

RTWP value

and uplink load

factor are

corrected

according to the

RTWP values of

each antenna

and the

multipath search

energy.

GUI Value

Range:OFF

(OFF), ON(ON)

Unit:None

Actual Value

Range:OFF, ON

Default

Value:OFF

(OFF)

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7CountersThere are no specific counters associated with this feature.

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8GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.

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9Reference Documents1. Load Control Feature Parameter Description

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Description 9 Reference Documents



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Anti-Imbalance of the Different Antenna(RAN15.0_01)

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