anti-imbalance of the different antenna(ran16.0_01)

WCDMA RAN

Anti-Imbalance of the DifferentAntenna Feature ParameterDescription

Issue 01

Date 2014-04-30

HUAWEI TECHNOLOGIES CO., LTD.

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 writtenconsent 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. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. 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 representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 01 (2014-04-30) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

i

http://www.huawei.com

mailto:[email protected]

Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................11.4 Differences Between Base Station Types.......................................................................................................................2

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

3 Technical Description...................................................................................................................4

4 Related Features.............................................................................................................................5

5 Network Impact.............................................................................................................................7

6 Engineering Guidelines...............................................................................................................86.1 When to Use...................................................................................................................................................................86.2 Required Information.....................................................................................................................................................86.3 Deployment....................................................................................................................................................................96.3.1 Requirements...............................................................................................................................................................96.3.2 Data Preparation..........................................................................................................................................................96.3.3 Activation..................................................................................................................................................................106.3.4 Activation Observation..............................................................................................................................................116.3.5 Deactivation...............................................................................................................................................................116.4 Performance Monitoring...............................................................................................................................................126.5 Parameter Optimization................................................................................................................................................136.6 Troubleshooting............................................................................................................................................................13

7 Parameters.....................................................................................................................................14

8 Counters........................................................................................................................................15

9 Glossary.........................................................................................................................................16

10 Reference Documents...............................................................................................................17

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription Contents


ii

1 About This Document

1.1 ScopeThis document describes Anti-Imbalance of the Different Antenna, including its technicalprinciples, related features, network impact, and engineering guidelines.

This document applies to the following NE types.

NE Type NE Model

RNC Not involved

NodeB Macro Not involved

Micro Not involved

LampSite Not involved

1.2 Intended AudienceThis document is intended for personnel who:l Need to understand the features described hereinl Work with Huawei products

1.3 Change HistoryThis section provides information about the changes in different document versions. There aretwo types of changes, which are defined as follows:

l Feature changeChanges in features of a specific product version

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 1 About This Document


1

l Editorial changeChanges in wording or addition of information that was not described in the earlier version

RAN16.0 01 (2014-04-30)This issue does not include any changes.

RAN16.0 Draft A (2014-02-28)Compared with Issue 02 (2013-12-30) for RAN15.0, Draft A (2014-02-08) of RAN16.0 includesthe following changes.

Change Type Change Description ParameterChange

Feature change None None

Editorialchange

Added chapter 3 Technical Description.Added the descriptions about the feature andfunction differences between different site types.For details, see section 1.4 Differences BetweenBase Station Types.

None

1.4 Differences Between Base Station Types

Differentiated Function Implementation by Macro, Micro, and LampSite SitesFor LampSite cells, this feature is mutually exclusive of WRFD-141202 IndependentDemodulation of Signals from Multiple Small Cell RRUs in One Cell.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 1 About This Document


2

2 Overview

Anti-Imbalance of the Different Antenna helps address shrinking uplink coverage and reducedsystem capacity in multi-antenna scenarios. When a base station uses multiple antennas, theseantennas may cause interference to each other. If antenna interference is imbalanced, themeasured RTWP may be inaccurate. This feature corrects the inaccurate RTWP values andtherefore reflects the actual cell load. In this way, system capacity and network coverage can bebetter balanced.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 2 Overview


3

3 Technical Description

If antennas are not properly installed or performance of the antennas deteriorate due to long-term use, intermodulation interference may occur. Intermodulation interference is a major causeof interference imbalance between antennas for a cell that uses multiple antennas.

For example, for a UMTS cell working in 1T2R mode, if there is intermodulation interferenceon the TX antenna, serious interference will be caused to the uplink of the antenna, while theRX antenna is not transmitting signals and does not have intermodulation interference in theuplink. Therefore, there is strong interference on one antenna but no interference on the otherantenna, causing interference imbalance between antennas of the same cell.

The RTWP of a cell is the average RTWP of all antennas serving the cell. When there is a hugegap between the RTWP of two antennas in a cell, the RTWP of the cell is high but the RTWPdoes not accurately reflect actual load of the cell, causing a decrease in uplink capacity of thecell.

When there is interference imbalance between antennas in a cell, the anti-imbalance algorithmfor different antennas can be used to calculate the RTWP of the cell based on the RTWP of eachantenna and the power of useful signals received by each antenna. The RTWP calculated in thisway reflects actual load of the cell more accurately. Therefore, more UEs can access the celland some UEs are allowed to increase their rates. As a result, system capacity is increased.

This feature is controlled by the ANTIANTENNAIMBALANCESW parameter on the NodeBside.

For details about load measurement, see Load Measurement Feature Parameter Description.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 3 Technical Description


4

4 Related Features

Prerequisite Features

None.

Mutually Exclusive Features

This feature is mutually exclusive of WRFD-021350 Independent Demodulation of Signals fromMultiple RRUs in One Cell.

None

For LampSite cells, this feature is mutually exclusive of WRFD-141202 IndependentDemodulation of Signals from Multiple Small Cell RRUs in One Cell.

Impacted Features

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

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 4 Related Features


5

l WRFD-070006 GSM and UMTS Load Balancing Based on Iur-gl WRFD-140213 Intelligent Access Class Controll WRFD-010712 Adaptive Configuration of Traffic Channel Power offset for HSUPAl WRFD-140215 Dynamic Configuration of HSDPA CQI Feedback Periodl WRFD-140216 Load-based Uplink Target BLER Configurationl WRFD-010641 HSUPA Adaptive Transmission

For details about the impact, see section 5 Network Impact.

This feature corrects only real-time RTWP values not delayed RTWP values. Therefore, thecalculated interference cancellation efficiency is inaccurate. In addition, after this function takeseffect and the following features are enabled, the value of the VS.HSUPA.Ic.MeanEff counterbecomes 0 or less than that before this function takes effect:

l WRFD-020137 Dual-Threshold Scheduling with HSUPA Interference Cancellationl WRFD-010210 Control Channel Parallel Interference Cancellation (CCPIC)l WRFD-140202 Control Channel Parallel Interference Cancellation (Phase 2)l WRFD-010691 HSUPA UL Interference Cancellationl WRFD-010691 HSUPA UL Interference Cancellation

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 4 Related Features


6

5 Network Impact

This function impacts system capacity and network performance during call admission andduring a call, which is described as follows:

l During call admissionIf interference is imbalanced between antennas, enabling the function reduces the uplinkadmission failure rate, improves the access success rate, and increases the number of onlineusers.

l During a call

– If WRFD 020136 Anti-Interference Scheduling for HSUPA is disabled,If interference is imbalanced between antennas, enabling this function improvesHSUPA 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 themeasured RTWP. This will reduce the effective probability of anti-interferencescheduling and increase the HSUPA cell throughout when anti-interference schedulingdoes not take effect. This feature in general improves the HSUPA cell throughput.

l In scenario of imbalanced interference between antennas, this feature improves the capacitybut 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 noticeablebecause the load on a CPU with a 1 GHz main frequency is only 0.001%.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 5 Network Impact


7

6 Engineering Guidelines

6.1 When to UseUse the anti-imbalance of the different antenna function in multi-antenna scenarios to addressshrinking uplink coverage and reduced uplink capacity caused by imbalanced antennainterference. Imbalanced antenna interference is caused by improper installation or agingantennas.

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

Do not enable this function for the following cells:

l Multi-RRU cells, including cells with the 0.5/0.5 configuration mode, the distributed sectorconfiguration mode, or independent demodulation of signals from multiple RRUs in onecell. Multi-RRU cells are often used for highway and tunnel coverage.

l LampSite cells in which WRFD-141202 Independent Demodulation of Signals fromMultiple Small Cell RRUs in One Cell has been enabled.

6.2 Required InformationPerform 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



– VS.MeanRTWP.Locell.SectorEqm.Ant3l On the NodeB side (average ratio of valid antennas):

– VS.ValidAntRatio.Meanl On the RNC side (mean RTWP of a cell):

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 6 Engineering Guidelines


8

– VS.MeanRTWP

Intermodulation interference exists when the following conditions are true:

l The values of RTWP counters between antennas on the NodeB side is greater than or equalto 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 (suchas attenuation or RTWP initial rectification value) to ensure that the difference is not caused byimproper parameter settings or faulty tower mounted amplifiers (TMAs). Then determinewhether to enable the anti-imbalance of the different antenna function. Enable this function onlywhen 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 ratel Counters: VS.HSUPA.Thruput.ROTAll, VS.PS.Bkg.Kbps.ULxx, VS.PS.Int.Kbps.ULxx,

VS.MeanULActualPowerLoad, VS.ValidAntRatio.Mean, and VS.MeanRTWP

----End

6.3 Deployment

6.3.1 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.l None

6.3.2 Data PreparationTable 6-1 lists the data to prepare before enabling this function.



9

Table 6-1 Data to prepare before enabling this function

Parameter Name Parameter ID Setting Notes Data Source

Anti-AntennaImbalanceAlgorithm Switch

ANTIANTENNAIMBALANCESW

Enable this functionif information insection 6.2 RequiredInformation meetsthe requirements insection 6.1 When toUse

Default value/Recommended value

6.3.3 Activation

Using MML Commands

Run the NodeB MML command SET ULOCELLALGPARA with Anti-Antenna ImbalanceAlgorithm Switch set to ON(ON).

MML Command Examples

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

SET ULOCELLALGPARA: ANTIANTENNAIMBALANCESW=ON;

Using the CMENOTE

l When configuring the feature on the CME, perform a single configuration first, and then perform abatch modification if required.

l Configure the parameters of a single object before a batch modification. Perform a batch modificationbefore 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 6-2. Forinstructions on how to perform the CME single configuration, see CME Single ConfigurationOperation 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. Forinstructions o how to perform a batch modification through the CME batch modification center,press F1 on the wizard interface to obtain online help.

----End



10

Table 6-2 Configuring parameters on the CME

SN MO NE ParameterName

ParameterID

Configurable in CMEBatchModification Center

1 ULOCELLALGPARA

NodeB Anti-AntennaImbalanceAlgorithmSwitch


Yes

6.3.4 Activation ObservationStep 1 Run the NodeB MML command LST ULOCELLALGPARA to check whether this function

is 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 equalto the value before the enabling of this function.

----End

6.3.5 Deactivation

Using MML Commands

Run the NodeB MML command SET ULOCELLALGPARA with Anti-Antenna ImbalanceAlgorithm Switch set to OFF(OFF).

MML Command Examples

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

SET ULOCELLALGPARA: ANTIANTENNAIMBALANCESW=OFF;

Using the CMENOTE

l When configuring the feature on the CME, perform a single configuration first, and then perform abatch modification if required.

l Configure the parameters of a single object before a batch modification. Perform a batch modificationbefore logging out of the parameter setting interface.

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



11

Set parameters on the CME according to the operation sequence described in Table 6-3. Forinstructions on how to perform the CME single configuration, see CME Single ConfigurationOperation 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. Forinstructions o how to perform a batch modification through the CME batch modification center,press F1 on the wizard interface to obtain online help.

----End

Table 6-3 Configuring parameters on the CME

SN MO NE Parameter Name

Parameter ID Configurable inCMEBatchModification Center

1 ULOCELLALGPARA

NodeB

Anti-AntennaImbalanceAlgorithmSwitch

ANTIANTENNAIMBA-LANCESW

Yes

6.4 Performance MonitoringAfter this function is enabled, perform the following steps to monitor the performance of thisfunction:

Step 1 Check whether this function takes effect by monitoring counters listed in Table 6-4.

This function takes effect if the value of the VS.MeanRTWP counter on the RNC side is smallerthan or equal to the values before the enabling of this function.

Table 6-4 RTWP-related counters during busy hours

Counter Name Description

VS.MeanRTWP Mean Power of Totally Received Bandwidthfor Cell

Step 2 Monitor the performance of this function.

l Query the value of the VS.HSUPA.Thruput.ROTAll/(SP*60) counter, in which SP is thestatistic period, and the unit is minute, during busy hours to determine whether the averageHSUPA throughout in a cell increases.



12

– After this function is enabled, the average HSUPA throughput in a cell increases whenantenna interference is imbalanced.

– After this function is enabled, the average HSUPA throughput in a cell decreases whensome antennas become invalid and the WRFD-020136 Anti-Interference Scheduling forHSUPA feature is activated.If the average HSUPA throughput does not increase when antenna interference isimbalanced, the live network may not meet the requirements in section 6.1 When toUse or the traffic volume is too small so that the gains provided by this function are notnoticeable.

l Monitor the CS RAB Setup Success Ratio and PS RAB Setup Success Ratio KPIs duringbusy hours to determine whether the access success rate increases.

– After this function is enabled, the access success rate increases when antenna interferenceis imbalanced and the RTWP-based anti-interference function is disabled; the accesssuccess rate decreases when antenna interference is imbalanced and the RTWP-basedanti-interference function is enabled.

– After this function is enabled, the access success rate decreases when some antennasbecome 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 calldrop rate increases.

– After this function is enabled in the scenario of imbalanced antenna interference, thethroughput increases, the coverage shrinks and the call drop rate deteriorates. You areadvised to disable this function if the call drop rate deteriorates seriously.

----End

6.5 Parameter OptimizationNone

6.6 TroubleshootingNone



13

7 Parameters

Table 7-1 Parameter description

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description


BTS3900,BTS3900WCDMA

SETULOCELLALGPARALSTULOCELLALGPARA

None None Meaning: Indicates whether to enable anti-antennaimbalance. If this switch is turned on, the RTWP valueand uplink load factor are corrected according to theRTWP values of each antenna and the multipath searchenergy.GUI Value Range: OFF(OFF), ON(ON)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(OFF)

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 7 Parameters


14

8 Counters

There are no specific counters associated with this feature.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 8 Counters


15

9 Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 9 Glossary


16

10 Reference Documents

1. Load Control Feature Parameter Description

WCDMA RANAnti-Imbalance of the Different Antenna Feature ParameterDescription 10 Reference Documents


17