03 Single Site Verification

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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

Single Site Verification


Foreword

� Single site verification is the first step of optimization

� Single site verification confirm the working state of each site


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


Contents

� Preparation of Single Site Verification

� Test Content of Single Site Verification

� Typical Problems Analysis in Single Site Verification


Preparation of Single Site Verification

� Site state check

� Check the site state by RNC LMT or M2000

� DSP CELL



� Site state check

� Result



� Configuration data collection

� RNC Configuration file collection

� Without parameters, the file will be saved at FTP directory under

BAM 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 less than 100

meters from NodeB in the direction of major beam of cell

antenna, with line-of-sight distance to NodeB.


Contents





Test Content of Single Site Verification

� Verification in Idle Mode

� Frequency Check

� Downlink frequency channel number = DL Frequency * 5

� For example

– UE shows the DL frequency is 2117.40

– The DL frequency point number is 10587




� Cell ID Check

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

with the planed one




� 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




� LAC/RAC Check

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

with the planed one




� 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



� 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




� 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




� Connection Test of PS Services

� Method

– Originating function of PS services by handset online service

– Pay attention to the throughput



� Drive Test for Coverage of the Site

� Method

� Prepare the NodeB location map

� need to cover 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



� 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





� HSDPA Access Function Test

� Method

� Origination high speed downloading service, such FTP download



� Antenna Diversity Check

� Objectivity

� Check whether the antenna for receiving diversity signals is reversely

connected




� 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




� 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


Contents





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


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.



� Analysis

� Check the output power of the cell



� Analysis

� Check the output power of the cell



� 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


Antenna Diversity Problem Analysis� In single site verification, antenna receiving diversity should be

checked

� Phenomenon

� Without subscriber, the RTWP test shows


Antenna Diversity Problem Analysis

� Phenomenon

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

10111 and 10112 RTWP increased at the same time,



� 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



� Re-test

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

check the RTWP of 10111 and 10112, only the RTWP of 10111

increased, the problem was resolved


Summary

� Single site verification

� Preparation

� Test contents

� Typical problems analysis

Thank youwww.huawei.com

Documents

03 Single Site Verification