HSPA+ Optimization Report

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

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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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. III

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

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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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. V

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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