OWO300020 WCDMA Single Site Verification ISSUE1.11

5/28/2018 OWO300020 WCDMA Single Site Verification ISSUE1.11

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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Single Site Verification


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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page2

Foreword

Single site verification is the first step of optimization

Single site verification confirm the working state of each site


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Objectives

Upon completion of this course, you will be able to:

Know the steps of single site verification

Know how to do single site verification

Know how to solve the ordinary problems in single site

verification


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Contents

1. Preparation of Single Site Verification

2. Test Content of Single Site Verification

3. Typical Problems Analysis in Single Site Verification


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Preparation of Single Site Verification

Site state check

Check the site state by RNC LMT or M2000

DSP CELL


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Site state check

Result


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Configuration data collection

RNC Configuration file collection

Without parameters, the file will be saved at FTP directory underBAM main path and file name can be specified by user, default

CFGMML-YearMonthDateHourMinSec.txt.




Configuration data collection

RNC configuration parameter checking by GENEX Nastar

NODEBNAME

LOCELL ID

MAXTXPOWER

LAC

RAC

Scramble PSCRAMBCODE

Frequency UARFCNDOWNLINK




Test location and route choose principle

The right test point meeting the following conditions:

Where the signals of target cell are strong

Where the signals of other cells are weak




Test location and route choose principle

For better performance, the following methods can be taken:

Disable power amplifiers of other cells except the cell to be measured

If cannot disable other cells, the testing point should be near the

center of the cell, with line-of-sight distance to the NodeB

For a macro cell, testing point should be 100 meters from NodeB in the

direction of major transmission of cell antenna, with line-of-sight distance

to NodeB.



Contents





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Test Content of Single Site Verification

Verification in Idle Mod e

Frequency Check

Downlink frequency point number = DL Frequency * 5

For example UE shows the DL frequency is 2117.40

The DL frequency point number is 10587


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Cell ID Check

Cell ID showed in test UE = configured RNCID * 65536 + configured

cell ID

For example

Configured RNC ID = 9

Configured Cell ID = 1210

Cell ID showed in test UE = 9 * 65536+1210 = 591034


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Scrambling code Check

At the right place, UE will show

PSC in active set, including the signal level PSC in monitor set, including the signal level


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LAC/RAC Check

Check whether the LAC/RAC of the cell to be measured is consistent

with the planed one


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CPICH_RSCP/CPICH_EcIo (Near Site) Test

Method

In the major transmission direction of antenna, fix a location with line-of-sight distance from the antenna within 100 meters from the NodeB

Test UE shows the signal level, including RSCP and Ec/Io

Bench Mark Value

For macro cells, CPICH RSCP >

75 dBm

For micro cells, CPICH RSCP > 60 dBm

For no-load cells, CPICH Ec/Io > 8 dB

For load-on cells, CPICH Ec/Io > 10 dB


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Verification in Connected Mode

Originating and Terminating Connection Test of Voice Service

Method

Use two handsets to call each other for five times.

Record the originating and terminating connection conditions


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Originating and Terminating Connection Test of VP Service

Method

Use two handsets to call each other for five times.

Record the originating and terminating connection conditions


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Connection Test of PS Services

Method

Originating function of PS services by handset online service

Pay attention to the throughput


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Drive Test for Coverage of the Site

Method

Prepare the NodeB location map

need to cover all major streets around the NodeB

Output area coverage map based on the pilot signals received by

scanner

Compare the CPICH RSCP and Ec/Io distribution of each cell


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HSDPA Access Function Test Preparation for HSDPA Test

Check defined downlink rate of the test USIM card

Check the related HSDPA parameters in RNC configuration file with

LST FRC and ensure USIM card subscribe rate is equal or greater

DlBeTraffDecThs

Prepare the DT software with HSDPA test function module

Prepare the terminal with HSDPA function and category Huawei E870, category 8, 7.2Mbps

Huawei E620, category 12, 1.8Mbps

Huawei E220, category 6, 3.6Mbps


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HSDPA Access Function Test

Method

Origination high speed downloading service, such FTP download


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Antenna Diversity Check

Objectivity

Check whether the antenna for receiving diversity signals is reversely

connected


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Method 1

In the cell to be measured, set UE transmits signals with the fixed

maximum power

Check the RTWP of the cell to be measured and the neighbor cells

If the RTWP of the corresponding cell increases only and the RTWP of

neighbor sectors changes less, the diversity receiver antenna is correctly

connected

If the RTWP of corresponding cell and other sectors increases at the

same time, the diversity receiver antenna is improperly connected


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Method 2

Connect the Tx/Rx feeder to the Rx ports and the Rx feeder to the

Tx/Rx port.

Compare the CPICH RSCP before and after exchanging feeders.

If the difference of CPICH RSCP before and after exchanging feeders is

more than 20 dB, the diversity receiver antenna is improperly connected


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Contents





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Weak Coverage Problem Analysis Phenomenon

In single site verification drive test, the signal level is very bad in

200m with line-of-sight

No blocking

Analysis

Check the alarm information (VSWR) no alarm

Check the feeder system

Downtilt angle

OK

Azimuth OK

Connector OK


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Weak Coverage Problem Analysis

Analysis

Check configuration file

The parameters related to CPICH power OK

33dBm, and the maximum transmission power for the cell 20W.


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Analysis

Check the output power of the cell


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Analysis

Check the output power of the cell


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Analysis

Base on the output power examination, the problem is located on

the PA problem

Solution

Change the PA

Re-test

Signal level back to normal


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Antenna Diversity Problem Analysis

In single site verification, antenna receiving diversity should be

checked

Phenomenon

Without subscriber, the RTWP test shows


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Phenomenon

Set the UE with maximum transmission power in 10111, the cell

10111 and 10112 RTWP increased at the same time


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Phenomenon

Set the UE with maximum transmission power in 10112, same

problem happened

Result

The receiving diversity antenna of cell 10111 and 10112 are

connected crossly.

Adjustment

Exchange the receiving diversity antenna of these two cells


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Re-test

Set the UE with the maximum transmission power in Cell 10111,

check the RTWP of 10111 and 10112


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Summary

Single site verification

Preparation

Test contents

Typical problems analysis


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Documents

OWO300020 WCDMA Single Site Verification ISSUE1.11