9.1 wcdma single site verification

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WCDMA Single Site Verification

ISSUE 1.0

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The single site function verification is critical in the process of the WCDMA network optimization, which mainly includes the test purpose, methods, process, input and output.

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Chapter 1 Chapter 1 Single site verification overviewSingle site verification overview

Chapter 2 Single site verification preparation

Chapter 3 Single site verification

Chapter 4 Problem example for site verification

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Single Site Verification OverviewSingle Site Verification Overview

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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 call access, call quality, handover and so on.

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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

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Tools:Tools:

Drive test scannerDrive test scanner : used for collecting the pilot signal data. Agilent E6455C;

Test UETest UE : used for service verification and system message collection. Qualcomm 6200, Motorola A835, Huawei U626 mobile;

Data collection software: Data collection software: used to display and log the signal strength, UE status, signal message and so on in time. Agilent E6474A software;

Data analysis software: Data analysis software: used to resolve message, analysis signal, solve problem and so on. Actix Analyzer software.

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Chapter 1 Single site verification overview

Chapter 2Chapter 2 Single site verification preparationSingle site verification preparation



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Single Site Verification PreparationSingle Site Verification Preparation

Before the single site verification, we should ensure the following conditions are met.

Alarm Check Cell Status Check Parameter Check

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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.

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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.

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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: the scrambling code, power setting, neighbor cell list, handover parameter etc.

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Chapter 3Chapter 3 Single site verificationSingle site verification


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Single Site Verification ItemsSingle Site Verification Items

InstallationsInstallations: CPICH RSCP, CPICH Ec/Io, Rx Antenna Swap Test

SettingsSettings: Frequency & SC, Cell reselection parameters, LAC/RAC, Neighbor List.

FunctionsFunctions: LA/RA update 3G<->2G Cell reselection SMS (MT & MO) Voice (MT & MO), VP (MT & MO), PS Attach & Detach, PS service, Voice/VP/PS soft

handover, Voice 3G->2G handover.

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Single Site VerificationSingle Site Verification

Test Process 1Test Process 1

Items: Items: LA update / RA update / PS Attach

Purpose:Purpose: Verify the LA update and RA update functions are normal, the PA attach function is normal.

Method:Method: Power on the Qualcomm mobile, if the ‘WCP’ indication is shown on the mobile screen, it means the LA update procedure is OK, the RA update procedure is OK, the PS attach is OK.

Notes: If the ‘WC’ is shown on the mobile, it means the LA update is OK. If the ‘P’ is shown on the mobile, it means the RA update and the PS attach is OK.

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Items:Items: PS Detach

Purpose:Purpose: Verify the PA detach function is normal

Method:Method: Choose “Menu -> 5 -> 9 -> 2” on Qualcomm mobile, if the ‘WCP’ indication is changed to ‘WC’ indication on the mobile screen, PS detach is OK.

Notes: N/A

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Items:Items: Frequency and Scrambling Code

Purpose:Purpose: Check the frequency and scrambling code for the verified cell is right or not. If it’s wrong, maybe the parameter setting or the Tx antenna installation have some mistake.

Method:Method: Setup the Agilent E6474A software, observe cell frequency and scrambling code from UMTS CPICH View window. Check the frequency and scrambling code for the verified cell is as same as planning.

Notes: N/A

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Items:Items: CPICH RSCP and CPICH Ec/Io

Purpose:Purpose: Check the CPICH RSCP and CPICH Ec/Io for the verified cell is normal or not. If it’s abnormal, maybe the Tx antenna installation or the downlink interference have some problems.

Method:Method: In the Agilent E6474A software, observe CPICH RSCP and CPICH Ec/Io from UMTS Status View window. Check if CPICH RSCP is higher than -85dBm and CPICH Ec/Io is higher than -8dB.

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Notes: The mobile shall be near the site

The CPICH RSCP and Ec/Io can be seen from scanner or Qualcomm mobile. Use the Qualcomm mobile to check the CPICH RSCP and CPICH Ec/Io.

When we use the Qualcomm mobile to check the CPICH RSCP and CPICH Ec/Io, the Io and Ec/Io shall be obtained, the CPICH RSCP shall be obtained through calculation: Ec = Ec/Io + Io

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Items:Items: Voice Call (MT & MO)

Purpose:Purpose: Verify the voice call function is normal and the voice call quality is good

Method:Method: Perform dial test of 3G speech service between two 3G mobiles, one for the terminating call and another one for the originating call.

Notes: Qualcomm or Motorola mobile

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Items:Items: VP Call (MT & MO)

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

Method: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.

Notes: Motorola mobile

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Items:Items: PS service

Purpose:Purpose: Verify the PS function is normal and the PS quality is good.

Method:Method: Make the dialing test of 3G PS service, which include WWW browsing and file downloading.

Notes: Qualcomm or Motorola mobile

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Items:Items: SMS (MT & MO)

Purpose:Purpose: Verify the SMS function is normal

Method:Method: Make the dialing test of 3G SMS service between two 3G mobiles, one for the terminating call and another one for the originating call.

Notes: Motorola mobile

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Items:Items: Cell reselection parameters, LAC/RAC, Neighbor

List

Purpose:Purpose: Check the parameters setting for the verified

cell

Method:Method: UE shall read the system information when UE is in idle mode. Collect UE reserved message and check the parameters with Actix Analyzer software after the drive test.

Notes: Cell reselection parameters: SIB3 LAC/RAC: SIB1 Neighbor list: SIB 11

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Items:Items: 3G->2G voice handover, 3G->2G cell reselection, 2G->3G cell reselection

Purpose:Purpose: Verify the 3G->2G handover and 3G<->2G cell reselection functions are normal.

Method:Method: Find a place where there is 2G signal without 3G signal. One mobile is keeping a voice call and another one is in idle mode. Move from 3G to 2G, the mobile with voice call shall handover to 2G and the mobile in idle mode shall reselect to 2G. Move from 2G to 3G, the mobile in idle mode shall reselect to 3G.

Notes: Use the Motorola mobile to do the test, the ‘3G’ or ‘2G’ indication is shown on the mobile screen

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Items:Items: Antenna swapping test

Purpose:Purpose: Verify the Rx feeder installation is right.

Method: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.

Notes: Check the RSCP from scanner

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Items:Items: Soft handover (Voice, VP, PS)

Purpose:Purpose: Verify the soft handover function is normal

Method:Method: Take a speech service or VP service or PS service call and keep it. Verify the soft handover from one sector to another sector. During the process, observe the CPICH scrambling code changing from Agilent UMTS CPICH View, and observe the active set update message from UMTS Protocol Messages View.

Notes: N/A

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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.

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Notice items 1: Test Point ChoiceNotice items 1: Test Point Choice

We should choose the test point where the CPICH RSCP of target sector is high enough.

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 are also strong.

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Notice items 2: Test Route ChoiceNotice 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.

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Notice items 3: Antenna Swapping Test PurposeNotice items 3: Antenna Swapping Test Purpose If the receive antenna crossed, the uplink diversity receive gain is loss, a

nd the uplink interfere is doubled. It will affect the uplink capability. If the RTWP is too high in nonloaded situation and no other interfer

ence, we can swap the Tx/Rx feeder and Rx feeder to check the downlink power.

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Chapter 4Chapter 4 Problem example for site verificationProblem example for site verification

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Problem Example for Site Verification Problem Example for Site Verification

In 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.

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AnswersAnswers

Scrambling Code Setting is wrongScrambling 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.

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AnswersAnswers

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.

9.1 wcdma single site verification

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