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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.
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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
WCDMA RAN
Anti-Imbalance of the Different Antenna Feature Parameter
Description Contents
Issue 01 (2013-04-28) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
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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.
WCDMA RAN
Anti-Imbalance of the Different Antenna Feature Parameter
Description 1 About This Document
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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.
WCDMA RAN
Anti-Imbalance of the Different Antenna Feature Parameter
Description 2 Overview
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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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Anti-Imbalance of the Different Antenna Feature Parameter
Description 3 Related Features
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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)
l WRFD-010691 HSUPA UL Interference Cancellation
l WRFD-010691 HSUPA UL Interference Cancellation
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Anti-Imbalance of the Different Antenna Feature Parameter
Description 3 Related Features
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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%.
WCDMA RAN
Anti-Imbalance of the Different Antenna Feature Parameter
Description 4 Network Impact
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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
VS.MeanRTWP.Locell.SectorEqm.Ant1
VS.MeanRTWP.Locell.SectorEqm.Ant2
VS.MeanRTWP.Locell.SectorEqm.Ant3
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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Description 5 Engineering Guidelines
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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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Description 5 Engineering Guidelines
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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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Anti-Imbalance of the Different Antenna Feature Parameter
Description 5 Engineering Guidelines
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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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Description 5 Engineering Guidelines
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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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Description 5 Engineering Guidelines
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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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Description 5 Engineering Guidelines
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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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Description 6 Parameters
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7CountersThere are no specific counters associated with this feature.
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Description 7 Counters
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8GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.
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Description 8 Glossary
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9Reference Documents1. Load Control Feature Parameter Description
WCDMA RAN
Anti-Imbalance of the Different Antenna Feature Parameter
Description 9 Reference Documents
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