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HSPA+ (64QAM) Radio Network Optimization Guide

R2.0

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ZTE Confidential Proprietary 2012 ZTE Corporation. All rights reserved.4(1)

LEGAL INFORMATION

By accepting this certain document of ZTE CORPORATION you agree to the following terms. If you do not agree to the following terms, please notice that you are not allowed to use this document.

Copyright 2012 ZTE CORPORATION. Any rights not expressly granted herein are reserved. This document contains proprietary information of ZTE CORPORATION. Any reproduction, transfer, distribution, use or disclosure of this document or any portion of this document, in any form by any means, without the prior written consent of ZTE CORPORATION is prohibited.

and are registered trademarks of ZTE CORPORATION. ZTEs company name, logo and product names referenced herein are either trademarks or registered trademarks of ZTE CORPORATION. Other product and company names mentioned herein may be trademarks or trade names of their respective owners. Without the prior written consent of ZTE CORPORATION or the third party owner thereof, anyones access to this document should not be construed as granting, by implication, estopped or otherwise, any license or right to use any marks appearing in the document.

The design of this product complies with requirements of environmental protection and personal security. This product shall be stored, used or discarded in accordance with product manual, relevant contract or laws and regulations in relevant country (countries).

This document is provided as is and as available. Information contained in this document is subject to continuous update without further notice due to improvement and update of ZTE CORPORATIONs products and technologies.

ZTE CORPORATION

Address:NO. 55Hi-tech Road SouthShenZhenP.R.China518057

Website:http://support.zte.com.cn

Email:800@zte.com.cn

Revision History

Product VersionDocument VersionSerial NumberReason for Revision

R1.0First published

R2.0The relevant contents of RNC V3.07 and the parameter configuration paths are updated for RNC V3.09 in Chapter 3.

Author

DateDocument VersionPrepared byReviewed byApproved by

2011-04R1.0Bai XuehuaMa WeiWang Zhenhai

2011-11-30R2.0Lu WenmingYang FengmeiJin Zhengtuan

Intended audience: UMTS radio network optimization engineers

Proposal: Before reading this document, you had better have the following knowledge and skills.SEQKnowledge and skillsReference material

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2

3

Follow-up document: After reading this document, you may need the following information.SEQReference materialInformation

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About This DocumentSummaryChapterDescription

1 BackgroundDescribes the background of the HSPA+ research.

2 Theoretical HSPA+ Rate AnalysisDescribes the influence on the rate after the HSPA+ technology is introduced.

3 HSPA+ Application and Evaluation of the Influence on the Existing NetworkDescribes the HSPA+ application method and the influence on the network.

4 HSPA+ OptimizationDescribes the limit parameter configuration and the common commercial network parameter configuration methods.

5 SummaryDescribes the HSPA+ performance optimization approach.

6 AttachmentDescribes the summarization of the HSPA+ performance research of Shenzhen branch of China Unicom.

TABLE OF CONTENTS1Background12Theoretical HSPA+ Rate Analysis23HSPA+ Application and Evaluation of the Influence on the Existing Network33.1Application Instruction33.1.1System Versions33.1.2Brief Introduction of the Functions33.1.3Parameter and Configuration43.2Influence on the Network64HSPA+ Optimization74.1Limit Rate Optimization74.2Commercial Network Optimization105Summary116Attachment12

FIGURESFigure 21 Diagram of the HS-PDSCH Frame Format2TABLESTable 21 Table of Physical Channel TS Formats2Table 31 Table of Parameters of 64QAM for HSDPA4Table 32 Table of the Parameter of Improved DL L2 Support Function6Table 41 Table of Limit Test Parameters7Table 42 Table of the Parameter Adjustment Result10

Document Title

HSPA+ (64QAM) Radio Network Optimization Guide Internal Use Only

ZTE Confidential Proprietary 2012 ZTE CORPORATION. All rights reserved.I

BackgroundIn the early 2011, China Unicom declared that the first phase of the HSPA+ commercial network deployment in key cities would be completed before May 17th, 2011 and the 64QAM and L2 enhancement function would be achieved. In order to meet the requirement of the new function and improve the users perception of PS service, the ZTE engineers compile this document to guide the on-site optimization.Theoretical HSPA+ Rate AnalysisThe theoretical analysis of the rate on the physical layer is demonstrated as follows.Figure 21 Diagram of the HS-PDSCH Frame Format

In the above figure, M indicates the number of bits represented by each modulation symbol.Table 21 Table of Physical Channel TS FormatsSlot Format #1Channel BitRateSFBit/HS-DSCH Sub-FrameBits/SlotM

QPSK480 Kbps169603202

16QAM960 Kbps1619206404

64QAM1440 Kbps1628809606

HSPA+ Application and Evaluation of the Influence on the Existing NetworkApplication InstructionSystem VersionsRNC: V3.09.30NodeB: V4.09.21OMMR: V3.09.30OMMB: V4.00.200The relative NEs include the UE, NodeB, RNC, SGSN, GGSN, and HLR. Note:Although the HSPA evolution changes the radio side, the PS CN should support the QoS parameter registration after the radio access network is changed. For example, the maximum rate which is higher than 14.4 Mbps should be supported.Brief Introduction of the FunctionsAfter the HSDPA and HSUPA technologies are introduced in the R5 and R6 versions, the 3GPP organization begins to introduce new technologies in the R7 version and later versions to improve the HSPA performance and enhance the capabilities and performance of HSPA-based radio networks. Then the HSPA networks will form an integral part of future 3G systems and must provide a smooth path towards the LTE. ZTE UTRAN equipment can support the R7 protocol version in June, 2007 and the following technologies can be realized.64QAM for the HSDPA. The DL peak rate of the HSPA network is increased to 21.6 Mbps and the realization of this feature depends on the Improved DL L2 Support function.Improved DL L2 Support functionThe L2 function definitions in the R6 version and the earlier versions are improved, so as to support the higher DL peak rate brought by the HSPA evolution technology.Parameter and ConfigurationRelevant Parameters of 64QAM for HSDPAThe parameter list is shown as follows.Table 31 Table of Parameters of 64QAM for HSDPAField NameName on the InterfaceParameter Description

Rnc64QAMInd64QAM Support IndicatorThis parameter indicates whether the RNC supports the 64QAM.

Supt64QamIndCell 64QAM Support IndicatorThis parameter indicates whether the cell supports the 64QAM.

Dl64QAMSuptInd64QAM DL Support IndicatorThis parameter indicates whether the neighbor cell supports the DL 64QAM.

Parameter configurationThe Rnc64QAMInd parameterOMC path: Click View > the Configuration Management tab > the RNC NE tab > the RNC Radio Resource Management tab > the Modify Advanced Parameter tab> the HSPA Configuration Information tab and check the value of the 64QAM DL Support Indicator parameter.Parameter configuration: If the parameter is set to Support by default, the engineers only need to check whether the parameter value is the default one. If the parameter value is Support, they should keep the value; if the parameter value is Not Support, they should modify the value.Associated parameter: the RncEnL2Ind parameter Only if the parameter is set to 1 (support), can the Rnc64QAMInd parameter be effective.The Supt64QamInd parameterOMC path: Click View > the Configuration Management tab > the RNC NE tab > the RNC Radio Resource Management tab > the externalUtranCell tab > the Modify Advanced Parameter tab and check the value of the 64QAM DL Support Indicator parameter.Parameter configuration: If the parameter is set to Support by default, the engineers need to modify the default value. If the parameter value is Support, they should keep the value; if the parameter value is Not Support, they should modify the value.The Dl64QAMSuptInd parameterOMC path: Click View > the Configuration Management tab > the RNC NE tab > the RNC Radio Resource Management tab > the externalUtranCell tab > the Modify Advanced Parameter tab and check the value of the 64QAM DL Support Indicator parameter.Parameter configuration: If the parameter is set to Support by default, the engineers need to modify the default value. If the parameter value is Support, they should keep the value; if the parameter value is Not Support, they should modify the value.Relevant Parameter of Improved DL L2 Support FunctionThe parameter list is shown as follows.Table 32 Table of the Parameter of Improved DL L2 Support FunctionField NameName on the Interface

RncEnL2IndRNC Enhanced Layer 2 Support Indicator

Parameter configurationThe RncEnL2Ind parameterOMC path: Click View > the Configuration Management tab > the RNC NE tab > the RNC Radio Resource Management tab > the externalUtranCell tab > the Modify Advanced Parameter tab and check the value of the 64QAM DL Support Indicator parameter.Parameter configuration: If the parameter is set to Support by default, the engineers only need to check whether the parameter value is the default one. If the parameter value is Support, they should keep the value; if the parameter value is Not Support, they should modify the value, because supporting the L2 enhancement is the prerequisite of the 64QAM service.Influence on the NetworkAfter the HSPA+ technology is introduced, a higher rate of the air-interface can be provided.After the HSPA+ technology is introduced, the power, codes, CE resources, and KPIs of the existing network are not affected.HSPA+ OptimizationLimit Rate OptimizationAccording to the sensitivity degree of the radio environment of the HSPA+ technology, if it is necessary to get the DL limit throughput performance, the engineers can adopt the limit configuration in the condition that there is no other user in the cell. The detailed parameter configuration is shown as follows. Table 41 Table of Limit Test ParametersParameterLocationDefault ValueParameter DescriptionModification Explanation

PcpichPwrR6Pcpich33 dBmP-CPICH transmission powerRange: 27 ~ 33 dBmThe parameter is set to 27 for the indoor test and set to 30 for the outdoor test.

PschPwr R6Psch3 dBPrimary SCH transmission powerRange:13.5 ~ 3 dBFor 21-M configuration, the modification value is 10.

SschPwr R6Ssch4 dBSecondary SCH transmission powerRange: 13.5 ~ 3 dBFor 21-M configuration, the modification value is 10.

NumofHsscchR6CHspa2Number of HS-SCCHsFor 21-M configuration, the modification value is 1, so as to adapt to 15 HS-PDSCHs.

NumofHspdschR6CHspa5Number of HS-PDSCHsFor 21-M configuration, the modification value is 15.

MINNUMOFHSPDSCHR6CHspa1Minimum HS-PDSCH numberFor 21-M configuration, the modification value is 15.

MAXNUMOFHSPDSCHR6CHspa5Maximum HS-PDSCH numberFor 21-M configuration, the modification value is 15.

DpchCodeHyR6CHspa16The reserved code resources for the non-HS-PDSCH physical channel For 21-M configuration, the modification value is 0, so as to adapt to 15 HS-PDSCHs.

CodeUptHyAR6CHspa4The hysteresis threshold of event A based on the code resources use rate of the non-HS-PDSCH physical channelFor 21-M configuration, the modification value is 0, so as to adapt to 15 HS-PDSCHs.

MeasPwrOffsetR6CHspa6 dBMeasured power offset of HS-PDSCH and PCPICH (or SCPICH)Range: 6 ~ 13 dBThe parameter is set to 13 for the indoor configuration and set to 9 for the outdoor configuration.

Whether the RNC supports the switch of L2 enhancementSupportIf the parameter is set to Support, the efficiency of the transmission from the RLC layer to application layer can be enhanced; if the parameter is set to Not Support, the system does not support the 64QAM.The parameter should be set to Support and the engineers should enable or disable the switch according to the requirement in the test items.

Whether the RNC supports the switch of the 64QAMSupportThe RNC global parameters are supported. After the switch is enabled, the RNC supports the 64QAM.The parameter should be set to Support and the engineers should enable or disable the switch according to the requirement in the test items.

Commercial Network OptimizationAccording to the thorough test, comparison of the parameters of different vendors, and the on-site parameter verification, the on-site downloading performance in the DT in the HSPA+ test area in Shenzhen was effectively improved. The HSPA+ optimization parameters finally fixed according to the on-site parameter adjustment in Shenzhen are shown as follows.Table 42 Table of the Parameter Adjustment ResultNo.Parameter NameDefault ValueTarget ValueInfluence Caused by the Modification

1Time to trigger(1D)320 ms1280 msNo service interruption

2MPO6 dB7.5 dBNo service interruption

3Maximum HS-PDSCH number514No service interruption

SummaryCurrently, the HSPA+ network optimization is consistent with the normal HSPA network optimization. The CQI distribution is improved through the RF optimization. After the 64QAM is applied and L2 enhancement is realized, the 64QAM demodulation mode will be adopted when the CQI is larger than 25.The engineers should pay attention to the following two aspects, in order to guarantee the sound HSPA+ users perception.The FE available transmission bandwidth of the NodeB should be larger than 28 M (Or the number of E1s should be larger than 14.).The proportion of the CQIs larger than 25 should be increased gradually.Attachment

1ZTE Confidential Proprietary

6 2012

Product Type Technical Description

Document Title

64QAM Radio Network Optimization Report of Shenzhen Branch of China Unicom

R1.0

Product Type Technical Proposal

VI 2012ZTE CORPORATION. All rights reserved.ZTE Confidential Proprietary

ZTE Confidential Proprietary 2012 ZTE Corporation. All rights reserved.4(1)

LEGAL INFORMATION

By accepting this certain document of ZTE CORPORATION you agree to the following terms. If you do not agree to the following terms, please notice that you are not allowed to use this document.

Copyright 2012 ZTE CORPORATION. Any rights not expressly granted herein are reserved. This document contains proprietary information of ZTE CORPORATION. Any reproduction, transfer, distribution, use or disclosure of this document or any portion of this document, in any form by any means, without the prior written consent of ZTE CORPORATION is prohibited.

and are registered trademarks of ZTE CORPORATION. ZTEs company name, logo and product names referenced herein are either trademarks or registered trademarks of ZTE CORPORATION. Other product and company names mentioned herein may be trademarks or trade names of their respective owners. Without the prior written consent of ZTE CORPORATION or the third party owner thereof, anyones access to this document should not be construed as granting, by implication, estopped or otherwise, any license or right to use any marks appearing in the document.

The design of this product complies with requirements of environmental protection and personal security. This product shall be stored, used or discarded in accordance with product manual, relevant contract or laws and regulations in relevant country (countries).

This document is provided as is and as available. Information contained in this document is subject to continuous update without further notice due to improvement and update of ZTE CORPORATIONs products and technologies.

ZTE CORPORATION

Address:NO. 55Hi-tech Road SouthShenZhenP.R.China518057

Website:http://support.zte.com.cn

Email:800@zte.com.cn

Revision History

Product VersionDocument VersionSerial NumberReason for Revision

R1.0First published

Author

DateDocument VersionPrepared byReviewed byApproved by

2011-04R1.0Bai XuehuaJin ZhengtuanJin Zhengtuan

Intended audience: UMTS RNS engineers

Proposal: Before reading this document, you had better have the following knowledge and skills.SEQKnowledge and skillsReference material

1NullNull

2

3

Follow-up document: After reading this document, you may need the following information.SEQReference materialInformation

1NullNull

2

3

About This DocumentSummaryChapterDescription

1 Project BackgroundIntroduces the background of the PA+ research.

2 Project SchemeIntroduces the personnel and scheme of the PA+ research.

3 Performance OptimizationIntroduces the problem analysis before the optimization and the network test conditions after the optimization in details.

4 SummaryDescribes the suggestions and summary.

TABLE OF CONTENTS1Project Background12Project Scheme22.1Time Scheme22.2Work Contents22.3Team Members22.4Test Devices23Performance Optimization33.1Test Time33.2Test Information33.3Test Method33.4Test Route33.5KPI Evaluation Before the Optimization43.5.1RSCP Distribution43.5.2CQI Distribution53.5.3HSDPA DL Throughput Distribution63.6Problem Analysis73.6.1Comparison and Analysis73.6.2Comparison and Verification83.7Network Assessment After the Optimization103.7.1RSCP Distribution103.7.2CQI Distribution113.7.3HSDPA DL Throughput Distribution123.8Comparison Before and After the Optimization133.8.1Comparison of Numbers of the Serving Link Migration Times133.8.2CQI Comparison143.8.3HSDPADL Throughput Comparison154Summary16

FIGURESFigure 31 Diagram of the Test Route4Figure 32 Diagram of the RSCP Distribution Before the Optimization4Figure 33 Diagram of the RSCP Statistics Before the Optimization5Figure 34 Diagram of the CQI Distribution Before the Optimization5Figure 35 Diagram of the CQI Statistics Before the Optimization6Figure 36 Diagram of the HSDPA DL Throughput Distribution Before the Optimization6Figure 37 Diagram of the HSDPA DL Throughput Statistics Before the Optimization7Figure 38 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 25609Figure 39 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 12809Figure 310 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 32010Figure 311 Diagram of the RSCP Distribution After the Optimization10Figure 312 Diagram of the RSCP Statistics After the Optimization11Figure 313 Diagram of the CQI Distribution After the Optimization12Figure 314 Diagram of the CQI Statistics After the Optimization12Figure 315 Diagram of the HSDPA DL Throughput Distribution After the Optimization13Figure 316 Diagram of the HSDPA DL Throughput Statistics After the Optimization13Figure 317 Diagram of the Comparison of the Numbers of Serving Link Migration Times14Figure 318 CQI Comparison14Figure 319 HSDPA DL Throughput Comparison15TABLESTable 21 Table of On-Site Technology Research Contents2Table 31 Table of the Test Information3Table 32 Table of Comparison of Network Test Data of ZTE and the Competitor7Table 33 Table of Comparison of the Parameter Configuration of ZTE and the Competitor8Table 34 Table of the Verification Result of the 1D Trigger Time Parameter8Table 35 Table of the DL Throughput Performance Comparison of Different MPO Configuration10Table 41 Table of the Parameter Adjustment Result16

Document Title

64QAM Radio Network Optimization Report of Shenzhen Branch of China UnicomInternal Use Only

ZTE Confidential Proprietary 2012 ZTE CORPORATION. All rights reserved.I

Project BackgroundIn the early 2011, China Unicom declared that the first phase of the HSPA+ commercial network deployment in domestic key cities would be completed before May 17th and the 64QAM and L2 enhancement function would be realized. In order to meet the requirement of the newly-added functions and improve the PS users perception, ZTE planned to conduct a specialized technology research, so as to enhance the proportion of CQIs larger than 25 and the HSPA+ downloading rate in Shenzhen.Project SchemeTime SchemeThe technology research was planned to be made from February 18th to March 31th.Work ContentsThe work contents of the on-site technology research are shown as follows.Table 21 Table of On-Site Technology Research ContentsProjectWork Contents

1HSPA+ network coverage test

2HSPA+ network coverage evaluation

3HSPA+ network coverage adjustment

4HSPA+ network parameter adjustment and verification

5Comparison and analysis of HSPA+ networks of different vendors

6HSPA+ specialized technology research summarization

Team MembersGuo Xuang from GU Product TeamBai Xuehua from Network Optimization System Dept.Lu Wenjie from Network Service OfficeYang Fujie from Guangzhou OfficeTest DevicesTest software: ZXPOS_CNT-U_V8.06.00.bTest tools: The MF662 (PA+ data card), laptop, CNT software dog, and GPSPerformance OptimizationTest TimeThe test was performed in the time range of 5:10 a.m. ~ 5:50 a.m. on March 29th in 2011.Test InformationTable 31 Table of the Test InformationSystem VersionNode BVersion: 4.00.30.07P05B006

RNCVersion: RNCV3.09.30.03

OMMVersion: OMMBV4.09.21.03P01

Radio Parameter Configuration List1D hysteresis: 3 dB1D triggering time length: 320 ms

Test MethodThe test is performed through the FTP downloading and on-line video display.Test RouteThe relative test route and site distribution are shown in the following figure.Figure 31 Diagram of the Test Route

KPI Evaluation Before the OptimizationRSCP DistributionJudging from the RSCP distribution result of the test area, the proportion of the areas whose RCSPs were larger than 85 dBm was 95.17% and the DL coverage was sound. Then the basic service demand can be satisfied.Figure 32 Diagram of the RSCP Distribution Before the Optimization

Figure 33 Diagram of the RSCP Statistics Before the Optimization

CQI DistributionJudging from the on-site CQI distribution, the average CQI value was 22.16 and the proportion of CQIs whose values were larger than 25 was 29.22%. Then the requirement on the CQIs (The proportion of CQIs larger than 25 should be larger than 15%) in the outdoor scenarios was satisfied.Figure 34 Diagram of the CQI Distribution Before the Optimization

Figure 35 Diagram of the CQI Statistics Before the Optimization

HSDPA DL Throughput DistributionJudging from the on-site HSDPA DL throughput distribution, the average DL throughput was about 5.22 Mbps.Figure 36 Diagram of the HSDPA DL Throughput Distribution Before the Optimization

Figure 37 Diagram of the HSDPA DL Throughput Statistics Before the Optimization

Problem AnalysisComparison and AnalysisIn the early March, the engineers in Guangzhou Office performed the PA+ network thorough test in Guangzhou. Judging from the on-site conditions, the competitors average PS DL thorough was about 6 Mbps and the PS downloading performance was better than that in Shenzhen.Table 32 Table of Comparison of Network Test Data of ZTE and the CompetitorKPIGuangzhouShenzhen

Test time60 mins30 mins

Single pilot proportion60.53%60.16%

Number of serving link migration times178167

PS throughput5.93 Mbps5.2 Mbps

Proportion of CQIs larger than 2522.99%29.22%

Average CQI22.422.16

According to the above statistical data analysis, the main factor affecting the PS downloading performance was the serving link migration frequency. Because the single-pilot controlling levels of the two vendors were similar, the difference in the radio parameter configuration leaded to the obvious downloading performance difference. The engineers compared the radio parameter configuration in Guangzhou and Shenzhen and found the differences in the following radio parameter configuration.Table 33 Table of Comparison of the Parameter Configuration of ZTE and the CompetitorParameterShenzhenGuangzhou

1A/1B (dB)3/53/5

1A/1B (trigger time)200/640320/320

1D hysteresis (dB)34

1D (trigger time)320640

MPO (dB)77.5

According to the international project experience, the engineers decided to adjust the parameter configuration in Shenzhen in the following way after the discussion with the R&D experts.The 1D (trigger time) parameter: The engineers set this parameter to 640, 1280, and 2560 and made the verification.The MPO parameter: The engineers set the parameter to 7.5 and made the verification.Comparison and VerificationVerification of the 1D Trigger Time ParameterJudging from the verification result, if the parameter was set to 2560, the average throughput was the best. However, in the test, the engineers found that this configuration may lead to abrupt throughput performance jitter. Finally, the engineers decided to choose 1280 as the recommended value.Table 34 Table of the Verification Result of the 1D Trigger Time Parameter1D Trigger TimeThroughput (Kbps)

320 ms5220.97

640 ms5517.36

1280 ms5793.33

2560 ms6083.33

The rate jitter conditions were different in different configuration of the 1D trigger time parameter. Judging from the on-site conditions, if the parameter was set to 1280, the rate would be more stable. The relevant rate distribution is shown in the following figure.Figure 38 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 2560

Figure 39 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 1280

Figure 310 Diagram of the PS Throughput Distribution in the Condition of the Parameter Being Set to 320

Verification of the MPO ParameterThe engineers verified the different conditions of MPO value being 7 and 7.5 when the value of the 1D trigger time parameter is set to 1280. Judging from the test result, the gain of 100 Kbps in the test result appeared when the MPO parameter was set to 7.5. Finally, the engineers chose 7.5 as the recommended value and the detailed data is shown in the following table.Table 35 Table of the DL Throughput Performance Comparison of Different MPO ConfigurationMPOThroughput (Kbps)

75793.33

7.55922.33

Network Assessment After the OptimizationRSCP DistributionThe RSCP distribution after the parameter optimization was basically the same with that before the optimization and no obvious fluctuation appeared.Figure 311 Diagram of the RSCP Distribution After the Optimization

Figure 312 Diagram of the RSCP Statistics After the Optimization

CQI DistributionThe average CQI value was 22.68 after the parameter modification and the proportion of the CQIs whose values were larger than 25 reached 31.47%.Figure 313 Diagram of the CQI Distribution After the Optimization

Figure 314 Diagram of the CQI Statistics After the Optimization

HSDPA DL Throughput DistributionAfter the parameter optimization the average HSDPA DL throughput increased to 5.9 Mbps. Figure 315 Diagram of the HSDPA DL Throughput Distribution After the Optimization

Figure 316 Diagram of the HSDPA DL Throughput Statistics After the Optimization

Comparison Before and After the OptimizationComparison of Numbers of the Serving Link Migration TimesAfter the optimization, the number of the serving link migration times was reduced from 6 per minute to 2 per minute. The improvement was obvious.Figure 317 Diagram of the Comparison of the Numbers of Serving Link Migration Times

CQI ComparisonAfter the parameter optimization, the proportion of the CQIs larger than 25 was increased from 29.22% to 31.47%.Figure 318 CQI Comparison

HSDPADL Throughput ComparisonThe PS DL throughput was increased from 5.2 Mbps to 5.9 Mbps after the optimization. The increase was obvious.Figure 319 HSDPA DL Throughput Comparison

SummaryAccording to the thorough test, comparison of the parameters of different vendors, and the on-site parameter verification, the on-site downloading performance in the PA+ test area in Shenzhen was effectively improved.The HSPA+ optimization parameters finally fixed according to the on-site parameter adjustment in Shenzhen are shown as follows.Table 41 Table of the Parameter Adjustment ResultNo.Parameter NameDefault ValueTarget ValueInfluence Caused by the Modification

1Time to trigger(1D)320 ms1280 msNo service interruption

2MPO6 dB7.5 dBNo service interruption

3Maximum HS-PDSCH number514No service interruption

1ZTE Confidential Proprietary

6 2012ZTE CORPORATION. All rights reserved.ZTE Confidential Proprietary