04-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 includes the test purpose, test methods, test process, input and output and others.

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

Agilent E6455C; Test UE, used for service verification and system messag

e collection. Qualcomm 6200 & Motorola A835 mobile; Data collection software, used to display and log the sign

al strength, UE status, signal message and so on in time. Agilent E6474A 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 only ensure the following conditions have been 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 VerificationSingle Site Verification

Site Verification Items: Installations: CPICH RSCP, CPICH Ec/Io, Rx Antenna S

wap Test Settings: Frequency & SC, Cell reselection parameters,

LAC/RAC, Neighbor List. Functions: LA/RA update, 3G<->2G Cell reselection, SM

S (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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Test Process 1 Items: LA update / RA update / PS Attach Purpose: Verify the LA update and RA update functions

are normal, the PA attach function is normal. 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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Test Process 2 Items: PS Detach Purpose: Verify the PA detach function is normal 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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Test Process 3 Items: Frequency and Scrambling Code 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: 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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Test Process 4 Items: CPICH RSCP and CPICH Ec/Io Purpose: Check the CPICH RSCP and CPICH Ec/Io for th

e verified cell is normal or not. If it’s abnormal, maybe the Tx antenna installation or the downlink interference have some problems.

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 fro

m 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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Test Process 5 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 feel.

Notes: Qualcomm or Motorola mobile

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Test Process 6 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 feel.

Notes: Motorola mobile

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Test Process 7 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 feel.

Notes: Qualcomm or Motorola mobile

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Test Process 8Items: SMS (MT & MO)Purpose: Verify the SMS function is normalMethod: 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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Test Process 9 Items: Cell reselection parameters, LAC/RAC, Neighbor L

ist Purpose: Check the parameters setting for the verified cel

l. 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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Test Process 10 Items: 3G->2G voice handover, 3G->2G cell reselection,

2G->3G cell reselection Purpose: Verify the 3G->2G handover and 3G<->2G cell

reselection functions are normal. 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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Test Process 11 Items: Antenna swapping test Purpose: Verify the Rx feeder installation is right. 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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Test Process 12 Items: Soft handover (Voice, VP, PS) Purpose: Verify the soft handover function is normal Method: Take a speech service or VP service or PS servi

ce 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 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 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 Purpose If the receive antenna crossed, the uplink diversity receive gain is

loss, and the uplink interfere is doubled. It will affect the uplink capability.

If the RTWP is too high in nonloaded situation and no other interference, 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 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.

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AnswersAnswers

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.

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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.

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04-WCDMA Single Site Verification