hspa+ optimization report
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7/28/2019 HSPA+ Optimization Report
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64QAM Radio Network
Optimization Report ofShenzhen Branch of ChinaUnicom
R1.0
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64QAM Radio Network Optimization Report of Shenzhen Branch of China Unicom
Internal Use Only
ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. I
LEGAL INFORMATION
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Revision History
Product Version Document Version Serial Number Reason for Revision
R1.0 First published
Author
Date Document Version Prepared by Reviewed by Approved by
2011-04 R1.0 Bai Xuehua Jin Zhengtuan Jin Zhengtuan
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Intended audience:UMTS RNS engineers
Proposal: Before reading this document, you had better have the following knowledge and skills.SEQ Knowledge and skills Reference material
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Follow-up document: After reading this document, you may need the following information.SEQ Reference material Information
1 Null Null
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About This Document
Summary
Chapter Description
1 Project Background Introduces the background of the PA+ research.
2 Project Scheme Introduces the personnel and scheme of the PA+ research.
3 Performance Optimization Introduces the problem analysis before the optimization and thenetwork test conditions after the optimization in details.
4 Summary Describes the suggestions and summary.
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TABLE OF CONTENTS
1 Project Background ........................................................................................ 12 Project Scheme ............................................................................................... 22.1 Time Scheme ................................................................................................... 22.2 Work Contents .................................................................................................. 22.3 Team Members ................................................................................................ 22.4 Test Devices ..................................................................................................... 23 Performance Optimization ............................................................................. 33.1
Test Time ......................................................................................................... 3
3.2 Test Information ................................................................................................ 33.3 Test Method ..................................................................................................... 33.4 Test Route ........................................................................................................ 33.5 KPI Evaluation Before the Optimization ............................................................ 43.5.1 RSCP Distribution ............................................................................................. 43.5.2 CQI Distribution ................................................................................................ 53.5.3 HSDPA DL Throughput Distribution .................................................................. 63.6 Problem Analysis .............................................................................................. 73.6.1 Comparison and Analysis ................................................................................. 73.6.2 Comparison and Verification ............................................................................. 83.7 Network Assessment After the Optimization ................................................... 103.7.1 RSCP Distribution ........................................................................................... 103.7.2 CQI Distribution .............................................................................................. 113.7.3 HSDPA DL Throughput Distribution ................................................................ 123.8 Comparison Before and After the Optimization ............................................... 133.8.1 Comparison of Numbers of the Serving Link Migration Times ......................... 133.8.2 CQI Comparison ............................................................................................. 143.8.3 HSDPADL Throughput Comparison ............................................................... 154 Summary ....................................................................................................... 16
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FIGURES
Figure 3-1 Diagram of the Test Route .................................................................................. 4Figure 3-2 Diagram of the RSCP Distribution Before the Optimization ................................. 4Figure 3-3 Diagram of the RSCP Statistics Before the Optimization ..................................... 5Figure 3-4 Diagram of the CQI Distribution Before the Optimization ..................................... 5Figure 3-5 Diagram of the CQI Statistics Before the Optimization ........................................ 6Figure 3-6 Diagram of the HSDPA DL Throughput Distribution Before the Optimization ...... 6Figure 3-7 Diagram of the HSDPA DL Throughput Statistics Before the Optimization .......... 7Figure 3-8 Diagram of the PS Throughput Distribution in the Condition of the Parameter
Being Set to 2560 ................................................................................................................... 9
Figure 3-9 Diagram of the PS Throughput Distribution in the Condition of the ParameterBeing Set to 1280 ................................................................................................................... 9Figure 3-10 Diagram of the PS Throughput Distribution in the Condition of the ParameterBeing Set to 320 ................................................................................................................... 10Figure 3-11 Diagram of the RSCP Distribution After the Optimization ................................ 10Figure 3-12 Diagram of the RSCP Statistics After the Optimization .................................... 11Figure 3-13 Diagram of the CQI Distribution After the Optimization .................................... 12Figure 3-14 Diagram of the CQI Statistics After the Optimization ....................................... 12Figure 3-15 Diagram of the HSDPA DL Throughput Distribution After the Optimization ..... 13Figure 3-16 Diagram of the HSDPA DL Throughput Statistics After the Optimization ......... 13Figure 3-17 Diagram of the Comparison of the Numbers of Serving Link Migration Times . 14Figure 3-18 CQI Comparison ............................................................................................. 14Figure 3-19 HSDPA DL Throughput Comparison ............................................................... 15
TABLES
Table 2-1 Table of On-Site Technology Research Contents ................................................. 2Table 3-1 Table of the Test Information ................................................................................ 3Table 3-2 Table of Comparison of Network Test Data of ZTE and the Competitor ............... 7Table 3-3 Table of Comparison of the Parameter Configuration of ZTE and the Competitor 8Table 3-4 Table of the Verification Result of the 1D Trigger Time Parameter ....................... 8Table 3-5 Table of the DL Throughput Performance Comparison of Different MPOConfiguration ........................................................................................................................ 10Table 4-1 Table of the Parameter Adjustment Result ......................................................... 16
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1 Project Background
In 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.
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2 Project Scheme
2.1 Time Scheme
The technology research was planned to be made from February 18th
to March 31th.
2.2 Work Contents
The work contents of the on-site technology research are shown as follows.
Table 2-1 Table of On-Site Technology Research Contents
Project Work Contents
1 HSPA+ network coverage test
2 HSPA+ network coverage evaluation
3 HSPA+ network coverage adjustment
4 HSPA+ network parameter adjustment and verification
5 Comparison and analysis of HSPA+ networks of different vendors
6 HSPA+ specialized technology research summarization
2.3 Team Members
Guo Xuang from GU Product Team
Bai Xuehua from Network Optimization System Dept.
Lu Wenjie from Network Service Office
Yang Fujie from Guangzhou Office
2.4 Test Devices
Test software: ZXPOS_CNT-U_V8.06.00.b
Test tools: The MF662 (PA+ data card), laptop, CNT software dog, and GPS
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3 Performance Optimization
3.1 Test Time
The test was performed in the time range of 5:10 a.m. ~ 5:50 a.m. on March 29th
in 2011.
3.2 Test Information
Table 3-1 Table of the Test Information
System Version
Node B Version:4.00.30.07P05B006RNC Version:RNCV3.09.30.03OMM Version: OMMBV4.09.21.03P01
Radio ParameterConfiguration List
1D hysteresis: 3 dB
1D triggering time length:320 ms
3.3 Test Method
The test is performed through the FTP downloading and on-line video display.
3.4 Test Route
The relative test route and site distribution are shown in the following figure.
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Figure 3-1 Diagram of the Test Route
3.5 KPI Evaluation Before the Optimization
3.5.1 RSCP Distribution
Judging from the RSCP distribution result of the test area, the proportion of the areas
whose RCSPs were larger than85 dBm was 95.17% and the DL coverage was sound.Then the basic service demand can be satisfied.
Figure 3-2 Diagram of the RSCP Distribution Before the Optimization
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Figure 3-3 Diagram of the RSCP Statistics Before the Optimization
3.5.2 CQI Distribution
Judging 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 3-4 Diagram of the CQI Distribution Before the Optimization
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Figure 3-5 Diagram of the CQI Statistics Before the Optimization
3.5.3 HSDPA DL Throughput Distribution
Judging from the on-site HSDPA DL throughput distribution, the average DL throughput
was about 5.22 Mbps.
Figure 3-6 Diagram of the HSDPA DL Throughput Distribution Before the Optimization
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Figure 3-7 Diagram of the HSDPA DL Throughput Statistics Before the Optimization
3.6 Problem Analysis
3.6.1 Comparison and Analysis
In 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 3-2 Table of Comparison of Network Test Data of ZTE and the Competitor
KPI Guangzhou Shenzhen
Test time 60 mins 30 mins
Single pilot proportion 60.53% 60.16%
Number of serving link migration
times178 167
PS throughput 5.93 Mbps 5.2 Mbps
Proportion of CQIs larger than 25 22.99% 29.22%
Average CQI 22.4 22.16
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.
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The engineers compared the radio parameter configuration in Guangzhou and Shenzhen
and found the differences in the following radio parameter configuration.
Table 3-3 Table of Comparison of the Parameter Configuration of ZTE and theCompetitor
Parameter Shenzhen Guangzhou
1A/1B (dB) 3/5 3/5
1A/1B (trigger time) 200/640 320/320
1D hysteresis(dB) 3 41D (trigger time) 320 640
MPO (dB) 7 7.5
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.
3.6.2 Comparison and Verification
3.6.2.1 Verification of the 1D Trigger Time Parameter
Judging 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 3-4 Table of the Verification Result of the 1D Trigger Time Parameter
1D Trigger Time Throughput (Kbps)
320 ms 5220.97
640 ms 5517.36
1280 ms 5793.33
2560 ms 6083.33
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.
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Figure 3-8 Diagram of the PS Throughput Distribution in the Condition of the ParameterBeing Set to 2560
Figure 3-9 Diagram of the PS Throughput Distribution in the Condition of the ParameterBeing Set to 1280
Data 1 (2560 ms + 7)
Data 2 (1280 ms + 7)
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Figure 3-10 Diagram of the PS Throughput Distribution in the Condition of theParameter Being Set to 320
3.6.2.2 Verification of the MPO Parameter
The 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 3-5 Table of the DL Throughput Performance Comparison of Different MPOConfiguration
MPO Throughput (Kbps)
7 5793.33
7.5 5922.33
3.7 Network Assessment After the Optimization
3.7.1 RSCP Distribution
The RSCP distribution after the parameter optimization was basically the same with that
before the optimization and no obvious fluctuation appeared.
Figure 3-11 Diagram of the RSCP Distribution After the Optimization
Data 3 (320 ms + 7)
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Figure 3-12 Diagram of the RSCP Statistics After the Optimization
3.7.2 CQI Distribution
The 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%.
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Figure 3-13 Diagram of the CQI Distribution After the Optimization
Figure 3-14 Diagram of the CQI Statistics After the Optimization
3.7.3 HSDPA DL Throughput Distribution
After the parameter optimization the average HSDPA DL throughput increased to 5.9
Mbps.
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Figure 3-15 Diagram of the HSDPA DL Throughput Distribution After the Optimization
Figure 3-16 Diagram of the HSDPA DL Throughput Statistics After the Optimization
3.8 Comparison Before and After the Optimization
3.8.1 Comparison of Numbers of the Serving Link Migration Times
After the optimization, the number of the serving link migration times was reduced from 6
per minute to 2 per minute. The improvement was obvious.
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Figure 3-17 Diagram of the Comparison of the Numbers of Serving Link MigrationTimes
3.8.2 CQI Comparison
After the parameter optimization, the proportion of the CQIs larger than 25 was increased
from 29.22% to 31.47%.
Figure 3-18 CQI Comparison
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3.8.3 HSDPADL Throughput Comparison
The PS DL throughput was increased from 5.2 Mbps to 5.9 Mbps after the optimization.
The increase was obvious.
Figure 3-19 HSDPA DL Throughput Comparison
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4 Summary
According 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 4-1 Table of the Parameter Adjustment Result
No. Parameter NameDefaultValue
TargetValue
Influence Caused
by theModification
1 Time to trigger(1D) 320 ms 1280 msNo serviceinterruption
2 MPO 6 dB 7.5 dBNo serviceinterruption
3 Maximum HS-PDSCH number 5 14No serviceinterruption
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