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8/10/2019 Adaptive Adjustment of HSUPA Small Target Retransmissions(RAN14.0_Draft a)
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Adaptive Adjustment of HSUPA Small TargetRetransmissionsRAN14.0
Feature Parameter Description
Issue Draft A
Date 2012-02-15
HUAWEI TECHNOLOGIES CO., LTD.
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Copyright © Huawei Technologies Co., Ltd. 2012. 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 orrepresentations 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 the 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]
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions Contents
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
i
Contents
1 Introduction ................................................................................................................................ 1-1
1.1 Scope ............................................................................................................................................ 1-1
1.2 Intended Audience ........................................................................................................................ 1-1
1.3 Change History .............................................................................................................................. 1-1
2 Overview ..................................................................................................................................... 2-1
3 Technical Description .............................................................................................................. 3-1
4 Related Features ....................................................................................................................... 4-1
4.1 Required Features ........................................................................................................................ 4-1
4.2 Mutually Exclusive Features ......................................................................................................... 4-1
4.3 Affected Features .......................................................................................................................... 4-1
5 Impact on the Network ............................................................................................................ 5-1
6 Engineering Guidelines ........................................................................................................... 6-1
6.1 When to Use HSUPA Small Target Adaptive Retransmissions ..................................................... 6-1
6.2 Feature Deployment ...................................................................................................................... 6-1
6.3 Performance Monitoring ................................................................................................................ 6-1
7 Parameters ................................................................................................................................. 7-1
8 Counters ...................................................................................................................................... 8-1
9 Glossary ...................................................................................................................................... 9-1
10 Reference Documents ......................................................................................................... 10-1
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 1 Introduction
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
1-1
1 Introduction
1.1 Scope
This document describes the feature Adaptive Adjustment of HSUPA Small Target Retransmissions interms of how the feature works, how to set parameters for it, how it relates to other features, and whatimpact it has on the network. This document also provides engineering guidelines for this feature.
This feature is known as WRFD-140222 Adaptive Adjustment of HSUPA Small Target Retransmissions(Try) in presale activities.
You are advised to read HSUPA Feature Parameter Description before reading this document.
1.2 Intended Audience
This document is intended for:
Personnel who are familiar with WCDMA basics Personnel who need to understand Adaptive Adjustment of HSUPA Small Target Retransmissions
Personnel who work with Huawei WCDMA 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:
Feature change: refers to a change in the feature Adaptive Adjustment of HSUPA Small TargetRetransmissions.
Editorial change: refers to a change in wording or the addition of information that was not described inthe earlier version.
Document Issues
The document issue is as follows:
Draft A (2012-02-15)
Draft A (2012-02-15)
This is the first draft of the document for RAN14.0.
This is a new document.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 2 Overview
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2-1
2 Overview
The hybrid automatic repeat request (HARQ) entity for High Speed Uplink Packet Access (HSUPA) islocated on the NodeB side and used to receive MAC-e protocol data units (PDUs). When a cell cannot
correctly receive MAC-e PDUs from a UE, the HARQ entity requires the UE to retransmit MAC-e PDUs.The average number of retransmissions on the NodeB side needs to converge to a target number ofretransmissions on the RNC side. This target number on the RNC side is dynamically adjusted by thefeature HSUPA Adaptive Retransmission.
With the HSUPA adaptive retransmission feature, a small target number of retransmissions is usedunder normal circumstances. When the uplink load or the UE transmit power is limited, one UE isselected to use a large target number of retransmissions during each period. Without this feature, asmall target number of retransmissions is always used. For details about the HSUPA adaptiveretransmission feature, see HSUPA Feature Parameter Description.
In versions earlier than RAN14.0, the small target number of retransmissions is specified by theEdchTargetLi t t leRetransNum parameter and cannot be adaptively adjusted. When the uplink load is
limited, a small target number of retransmissions will require a high signal-to-interference ratio (SIR) onthe Dedicated Physical Control Channel (DPCCH), and the DPCCH must have a higher power. Thisleads to decreased available power on the Enhanced Dedicated Channel (E-DCH) andEnhanced Dedicated Physical Data Channel (E-DPDCH), a lower UE throughput, and a lower cellthroughput. To address these problems, RAN14.0 introduced the feature Adaptive Adjustment of HSUPASmall Target Retransmissions. This feature supports an alternative small target number ofretransmissions for each typical type of service. The actual small target number of retransmissions candynamically shift between the original fixed number and the alternative number based on the cell uplinkload and UE rates, which are configured by the EdchTargetLitt leRetransNum andEdchAltTarLitt leRetransNum parameters, respectively. This improves the system capacity when theuplink load is limited.
Figure 2-1 shows the relationship between the features HSUPA Adaptive Retransmission and Adaptive
Adjustment of HSUPA Small Target Retransmissions.
Figure 2-1 Relationship between the features HSUPA Adaptive Retransmission and Adaptive Adjustment ofHSUPA Small Target Retransmissions
The features HSUPA Adaptive Retransmission and Adaptive Adjustment of HSUPA Small Target
Retransmissions are independent of each other. With the HSUPA Adaptive Retransmission feature, only
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 2 Overview
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2-2
one UE is selected to use the large target number of retransmissions during each period. With the Adaptive Adjustment of HSUPA Small Target Retransmissions feature, when the uplink load is limited,multiple UEs are selected for adjustment to the small target number of retransmissions. This furtherimproves the cell throughput.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 3 Technical Description
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
3-1
3 Technical Description
Without the feature Adaptive Adjustment of HSUPA Small Target Retransmissions, the RNC setsdifferent target numbers for different typical types of services through the EdchTargetLi t t leRetransNum
parameter. This feature is intended to further improve the cell throughput. An alternative small targetnumber of retransmissions is available for each typical type of service. This alternative small number isconfigured by the EdchAltTarLi t t leRetransNum parameter. The original small number is configured bythe EdchTargetLi t t leRetransNum parameter. The small target number of retransmissions dynamicallyshifts between EdchTargetLitt leRetransNum and EdchAltTarLitt leRetransNum .
Figure 3-1 shows the procedure for dynamically adjusting the small target number of retransmissions.
Figure 3-1 Procedure for dynamically adjusting the small target number of retransmissions
As shown in Figure 3-1, the feature Adaptive Adjustment of HSUPA Small Target Retransmissionsdynamically adjusts the small target number of retransmissions for each single BE service over HSUPA.
When the UE attempts to access the network, the larger value between EdchTargetLitt leRetransNum
and EdchAltTarLitt leRetransNum is used as the small target number of retransmissions if
PC_HSUPA_LITRETNUM_INIT_SEL_SWITCH under the PcSwitch parameter is selected, or
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 3 Technical Description
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
3-2
EdchTargetLi t t leRetransNum is used if PC_HSUPA_LITRETNUM_INIT_SEL_SWITCH under thePcSwitch parameter is not selected.
After the UE accesses the network, the following rules apply ifPC_HSUPA_LITRETNUM_AUTO_ADJUST_SWITCH under the PcSwitch parameter is selected:
If the UE rate is above the upper threshold and the uplink load of the cell has not reachedMaxTargetUlLoadFactor multiplied by RelRatioforUlRTWP , the RNC adjusts the small targetnumber of retransmissions to the smaller one between EdchTargetLitt leRetransNum andEdchAltTarLitt leRetransNum in order to raise the UE throughput. The upper threshold equals theminimum bit rate (MBR) of uplink services multiplied by an unconfigurable factor .
If the UE rate is below the lower threshold and the uplink load of the cell has reachedMaxTargetUlLoadFactor multiplied by TrigRatioforUlRTWP , the RNC adjusts the small targetnumber of retransmissions to the larger one between EdchTargetLitt leRetransNum andEdchAltTarLitt leRetransNum in order to raise the cell throughput on the uplink. The lower thresholdequals the MBR of uplink services multiplied by an unconfigurable factor .
In other cases, the RNC does not make any adjustments.
Table 3-1 lists the unconfigurable factors for different MBRs.
Table 3-1 Unconfigurable factors for different MBRs
MBR (Mbit/s)Unconfigurable Factor for theUpper Threshold
Unconfigurable Factor for theLower Threshold
< 1 90% 60%
≥ 1, excluding thefollowing:Services with
Quadrature Phase ShiftKeying (QPSK) modulation
and a 5.44 Mbit/s MBR Services with 16QAM
modulation and an 11.52Mbit/s MBR
90% 70%
5.44 (QPSK modulation) 75% 70%
11.52 (16QAM modulation) 75% 70%
If the features HSUPA Adaptive Retransmission and Adaptive Adjustment of HSUPA Small TargetRetransmissions are both enabled and the air interface resources or UE transmit power on the uplink islimited, the Adaptive Adjustment of HSUPA Small Target Retransmissions feature selects one UE to usethe large target number of retransmissions during each period. If the selected UE later meets theconditions for using the small target number of retransmissions, the larger one betweenEdchTargetLitt leRetransNum and EdchAltTarLitt leRetransNum is used. For details about theseconditions, see the HSUPA Feature Parameter Description.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 4 Related Features
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4-1
4 Related Features
4.1 Required Features
This feature depends on WRFD-010612 HSUPA Introduction Package.
4.2 Mutually Exclusive Features
A cell can be simultaneously configured with the feature Adaptive Adjustment of HSUPA Small TargetRetransmissions and the feature DC-HSUPA. However, if DC-HSUPA is enabled for a UE, Adaptive Adjustment of HSUPA Small Target Retransmissions will not work for this UE.
4.3 Affected Features
None
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 5 Impact on the Network
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-1
5 Impact on the Network
Impact on System Capacity
When the uplink load of the cell is limited, the feature Adaptive Adjustment of HSUPA Small TargetRetransmissions increases system capacity.
Impact on Network Performance
None.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 6 Engineering Guidelines
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
6-1
6 Engineering Guidelines
6.1 When to Use HSUPA Small Target Adaptive
Retransmissions
This feature is recommended if HSUPA is deployed.
6.2 Feature Deployment
For details about how to activate, verify, and deactivate this feature, see Configuring Adaptive Adjustment of HSUPA Small Target Retransmissions.
When configuring the parameter EdchAltTarLi t t leRetransNum , the default value for this parameter isrecommended. An inappropriate value for this parameter may lead to decreased cell throughput. Forservices with a 5.44 Mbit/s MBR and a 2 ms transmission time interval (TTI), this parameter’s defaultvalue is 0.02. For other services with a 2 ms TTI, this parameter’s default value is 0.01. For services with
a 10 ms TTI, this parameter’s default value is 0.1.
6.3 Performance Monitoring
When the uplink load is limited and there are multiple HSUPA UEs, this feature improves the cellthroughput. To verify the effect of this feature, check the value of the counterVS.HSUPA.MeanChThroughput.TotalBytes, which indicates the number of packets received in theHSUPA MAC-d flow in a cell. With the traffic pattern unchanged, this feature is supposed to increase thevalue of this counter.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 7 Parameters
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7-1
7 Parameters
Table 7-1 Parameter description
Parameter ID NE MML Command Description
EdchAltTarLittleRetransNum
BSC6900 ADD UTYPRABOLPC
MOD UTYPRABOLPC
Meaning: Alternative target number of timesthat the MAC-ES flow carrying a service isretransmitted in the small retransmissionstate. This parameter, when used with"EdchTargetLittleRetransNum", increasesthroughput of a single UE or cell throughput.
GUI Value Range: 0~15000
Actual Value Range: 0~15, step: 0.001
Unit: None
Default Value: None
EdchTargetLittleRetransNum
BSC6900 ADD UTYPRABOLPC
MOD UTYPRABOLPC
Meaning: Target number of E-DCH PDUr etransfer when small probabilityretransmission is applied to this service. Thesmall probability retransmission is used toimprove the throughput of a single UE whenthe cell load is in the normal state.
GUI Value Range: 0~15000
Actual Value Range: 0~15, step: 0.001
Unit: None
Default Value: None
MaxTargetUlLoadFactor
BSC6900 ADD UCELLHSUPA
MOD UCELLHSUPA
Meaning: The parameter specifies the targetvalue of the uplink load. HSUPA powercontrol on the NodeB side keeps uplink loadclose to the target value. For details aboutthis parameter, refer to 3GPP TS 25.433.
GUI Value Range: 0~100
Actual Value Range: 0~1
Unit: %
Default Value: 75
RelRatioforUlRTWP BSC6900 ADD UCELLLDM
MOD UCELLLDM
Meaning: UL load restricted releasethreshold ratio.If the state of the load for theTTI switchover algorithm is restricted andthe realtime uplink load factor of cell issmaller than the product of "MaximumTarget Uplink load Factor" and "UL loadrestricted release threshold ratio", then thestate of the load for the TTI switchoveralgorithm is set to normal.
GUI Value Range: 0~100
Actual Value Range: 0~1
Unit: %
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 7 Parameters
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7-2
Parameter ID NE MML Command Description
Default Value: 60
TrigRatioforUlRTWP BSC6900 ADD UCELLLDM
MOD UCELLLDM
Meaning: UL load restricted trigger
threshold ratio.If the state of the load for theTTI switchover algorithm is normal and therealtime uplink load factor of cell is greaterthan the product of "Maximum Target Uplinkload Factor" and "UL load restricted triggerthreshold ratio", then the state of the load forthe TTI switchover algorithm is set torestricted.
GUI Value Range: 0~100
Actual Value Range: 0~1
Unit: %
Default Value: 73
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 8 Counters
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
8-1
8 Counters
There are no specific counters associated with this feature.
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 9 Glossary
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9 Glossary
For the acronyms, abbreviations, terms, and definitions, see the Glossary .
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WCDMA RAN
Adaptive Adjustment of HSUPA Small Target
Retransmissions 10 Reference Documents
Issue Draft A (2012-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10-1
10 Reference Documents
[1] HSUPA Feature Parameter Description