WCDMA RNO Single Site Verification

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WCDMA RNO Single Site

Verification

Technology Changes.

Communication Lasts.


Course Contents

Chapter 4 Problem example for site verification

Chapter 3 Single site verification

Chapter 2 Single site verification preparation

Chapter 1 Single site verification overview


Single Site Verification Overview


Flow chart of single site verification



Purpose: The single site verification test is a part of the

WCDMA network optimization to ensure that the basic

functions of the cell are normal, such as coverage ,call

access, call quality, parameter setting and so on.



Content: Through the single site function verification, the

following functions for each cell shall be checked as normal :

Verify coverage ( CPICH RSCP & Ec/Io )

Verify scrambling code

Verify no installation faults (e.g. crossed feeders)

Make service call test



Tools:

Drive test scanner, used for collecting the pilot signal data.

DTI;

Test UE, used for service verification and system

message collection. Huawei 626;

Data collection software, used to display and log the

signal strength, UE status, signal message and so on in

time. Genex Probe;

Data analysis software, used to resolve message, analysis

signal, solve problem and so on. Genex Assistant .






Course Contents


Single Site Verification Preparation

Before the single site verification, we should only ensure the

following conditions have been met.

Alarm Check

Cell Status Check

Parameter Check



Alarm Check

The product support engineer will be responsible for

checking and resolving all the alarms. It is important for

the optimization engineer prior to any field test to check

with product support engineer regarding any alarms

especially intermittent alarms.



Cell Status Check

The product support engineer will be responsible for

checking and resolving all the cell state problems. It is

important for the network optimization engineer prior to

any field test to confirm with product support engineer

regarding cell state.



Parameter Check

The optimization engineer need to ensure the radio part

parameters configuration list has been achieved. In the list

the radio part parameters includes: LAC and

RAC ,frequency, the scrambling code, etc.


Course Contents






Single Site Verification

Site Verification Items:

Installations: CPICH RSCP, CPICH Ec/Io, Rx Antenna

Swap Test

Settings: Frequency & SC, LAC/RAC

Functions: Voice (MT & MO), VP (MT & MO), etc.



Test Process 1

Items: LAC and RAC

Purpose: Verify the LAC and RAC is as same as that of planning

Method: Power on the huawei626 mobile, press the Application Program,

and select 2 WCDMA network information, RAC and LAC in the network

can been seen.

Notes: if the LAC and RAC is not as same as that of RNP, we should

modify it and test it again

Application program



Test Process 2

Items: Frequency and Scrambling Code

Purpose: Check the frequency and scrambling code for

the verified cell if its right or not.

Method: Power on the huawei626 mobile, press the

Application Program, and select 3 WCDMA active

set/monitor set, Frequency DL and Scrambling Code in

the network can been see.

Notes: If the frequency and scrambling code is not as

same as that of the planning, there is some mistakes with

the parameter setting or the Tx antenna installation



Test Process 3

Items: CPICH RSCP and CPICH Ec/Io

Purpose: Check the CPICH RSCP and CPICH Ec/Io for the

verified cell is normal or not.

Method: Power on the huawei626 mobile, press the Application

Program, and select 3 WCDMA active set/monitor set. Check if

CPICH RSCP(Ec) is higher than -85dBm and CPICH Ec/Io is

higher than -8dB.

Notes: (1) The mobile shall be near the site.

(2) If its abnormal, maybe the Tx antenna installation

or the downlink interference have some problems.



Test Process 4

Items: Voice Call (MT & MO)

Purpose: Verify the voice call function is normal and the

voice call quality is good

Method: Make the dialing test of 3G speech service

between two 3G mobiles, one for the terminating call and

another one for the originating call. Test the speech

communication quality by your feeling.

Notes: huawei626 mobile



Test Process 5

Items: VP Call (MT & MO)

Purpose: Verify the VP call function is normal and the VP

call quality is good

Method: Make the dialing test of 3G VP service between

two 3G mobiles, one for the terminating call and another

one for the originating call. Test the speech and photo

communication quality by your feeling.




Test Process 6

Items: PS service

Purpose: Verify the PS function is normal and the PS

quality is good.

Method: Make the dialing test of 3G PS service, which

include WWW browsing and file downloading. Test the PS

connection quality by your feeling.




Test Process 7

Items: Antenna swapping test

Purpose: Verify the Rx feeder installation is right or not

Method: Switch the transmitter from one feeder to another,

check the RSCP changed or not. If no change happened,

it means that the feeder is correct. Check the RSCP from

scanner

If the receive antenna crossed, the uplink diversity receive

gain is loss, and the uplink interfere is doubled. It will

affect the uplink capability. Check the RTWP of the cell.



Troubleshooting:

The problem recording list should be filled in and the

product support engineer should be encouraged to solve

the problems.

Track the problems until they are solved.



Notice items 1: Test Point Choice

We shall choose the test point where the CPICH RSCP of

the target sector is high enough and that of other sector is

poor.

The test points should be chosen near the site and ideally

with line-of-sight to the site.

The test points should not be chosen under the site as the

signal of other sectors of same site is strong too.



Notice items 2: Test Route Choice

The driving test route should connect the test points of the

sectors. It is required that signals not be shadowed by buildings

along the test route to avoid turning the test into a coverage test.

The figure below shows the way to select the test points and the

test route.


Course Contents






Problem Example for Site Verification

In the site verification, following problems have been found

Scrambling Code Setting is wrong: The scrambling code

from scanner and mobile is different from the planning

After feeder swapped, the CPICH RSCP is 20dB lower

than before.


Answers

Scrambling Code Setting is wrong

The Scrambling Code may be wrong in RNC, check the

datasheet in RNC.

If the Scrambling Code from scanner is the same as that

of another sector in same site planned, maybe the TX/RX

feeder is crossed to the another sector.


Answers

After feeder swapped, the CPICH RSCP is 20dB lower than

before:

The RX feeder is crossed to the antenna of another sector.

In this case, the CPICH RSCP will be high in the coverage

area of the other antenna. Check the connection between

the feeder and the antenna.

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WCDMA RNO Single Site Verification

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