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GSM-To-UMTS Training Series 13_WCDMA Single Site Verification_V1.0
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HUAWEI TECHNOLOGIES CO., LTD.
HUAWEI Confidential
Internal
www.huawei.com
WCDMA RNO Single Site Verification
GSM-to-UMTS Training Series_V1.0
Page 2HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Date Revision Version
Description Author
2008-12-31 1.0 Draft completed Gao Bo
2009-01-091.1
Precautions and methods for result checking in page 10, 15, and 30 added
Liu Nanchuan
2009-01-171.2
Differences between the GSM and the UMTS single site verifications in page 9, 15, 16, and 19 added
Hou Chong
Change History
Page 3HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
The WCDMA network optimization should
involve the acceptance and check of all
site devices to ensure that the basic
functions of cells at each site in the areas
to be optimized are proper, such as
access, call, and switchover.
Page 4HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Know the objectives and
contents of single site
verification
Know the process of single site
verification
Know the methods for single
site verification
Upon completion of this course, you will be able to
Page 5HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Chapter 1 Overview of Single Site Verification
Chapter 2 Preparations for Single Site
Verification
Chapter 3 Test Contents of Single Site
Verification
Chapter 4 Cases of Single Site Verification
Page 6HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Overview of Single Site Verification
Project Signing
Preparation and Project Launch
Single Site
Verification
RF Optimization
Parameter
Optimization
Customer
Acceptance
Output of
Optimization Report
Page 7HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Overview of Single Site Verification
Ensure that basic functions of cells at each site of the area to be
optimized (such as access and call) are proper before the RF
optimization.
Separate the problems to be addressed in network optimization such
as call drop and access caused by network coverage from those
caused by device functions, which facilitates the subsequent problem
location and troubleshooting, and increases the network operation
efficiency.
Be familiar with the site location, configuration, ambient wireless
environment in the area to be optimized through single site
verification, which lays a sound foundation for further optimization.
Page 8HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Overview of Single Site Verification
Through the single site verification, check whether the
following functions in each cell are proper:
Parameter configuration check in idle mode
Call check in connection mode (AMR/VP/PS)
Coverage check (CPICH RSCP & CPICH Ec/Io)
Site installation check (Ensure that the feeder is
connected properly.)
……
Page 9HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Chapter 1 Overview of Single Site Verification
Chapter 2 Preparations for Single Site
Verification
Chapter 3 Test Contents of Single Site
Verification
Chapter 4 Cases of Single Site Verification
Page 10HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Ensure that the following conditions are met before the check
of single site functions:
Site state and alarm check
Configuration data collection and check
Tools and software preparation
Other preparations
Page 11HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Site state and alarm check
Ensure that no alarm is generated in the cell to be measured, and
the cell to be measured works properly before the site check.
For each NEs such as the RNC, NodeB, MSC, and SGSN, check for
the board and transmission faults of each NE by the LMT or M2000.
Identify the causes and clear the faults to the greatest extent.
Check the state of cells to be measured by the RNC LMT or M2000.
Ensure that the establishments of all cells are complete, the
Management State is set to Unblocking, the cell operation state is
Available.
MML command to query the cell state: DSP CELL
Page 12HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Site state and alarm check
Generally, product support engineers check the cell state and
alarm, analyze and solve the identified alarm and state problems.
Before the site verification, the optimization engineers need to
confirm with the product support engineers whether the alarm is
generated, whether problems are solved, and whether cell state is
proper.
The engineers need to pay special attention to intermittent alarms.
For example, the transmission alarm can be automatically reset,
which may cause network instability, or have adverse impact on
services.
Page 13HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Site state and alarm check
Check whether alarms are generated in NEs in the Core
Network, such as MSC, SGSN, and GGSN.
− In the cell undergone single site verification, make one or two
phone calls to check whether the functions are proper.
− You need not consult the product support engineers from the
core network each time before the check.
Page 14HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Configuration data collection and check
Before the site check, collect the configuration data of network
planning and other data in RNC database, and ensure that the
configured data is consistent with the planned one.
The configuration data can be collected and analyzed by using:
− Collect the configuration data by MML scripts
− Query and analyze the configuration data by Nastar
Page 15HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Configuration data collection and check
Check whether the cell configuration data is consistent with the
planned one, such as NODEBNAME, LOCELL ID, MAXTXPOWER,
LAC, RAC, PSCRAMBCODE, and UARFCNDOWNLINK.
-MML to query the cell configuration data: LST CELL
The parameters configured in the network planning are obtained
from the Wireless Parameter Planning List prepared in the network
planning phase. After the check is complete, the Wireless
Parameter Configuration List is developed for the optimization
phase. The items are the same as those in the Wireless Parameter
Planning List.
Page 16HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Tools and software preparation
Scanners in drive test to collect the pilot signal data, such as Agilent
E6455C and DTI SCANNER.
Test UEs to verify services, such as the HUAWEI U626, Qualcomm
6250, and Motorola A830.
Foreground processing software to display and record signal
strength, UE state, and signaling information in real-time mode, such
as the GENEX Probe.
Background analysis software to interpret signaling, analyze signals,
and locate problems, such as the GENEX Assistant.
Page 17HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Preparations for Single Site Verification
Other preparations
Check whether the power transmission is allowed in each site by
consulting the optimization personnel from the operator side.
Obtain the test UE number
Check whether the UE is the handset or data card in engineering mode,
and whether the UE battery is already recharged.
Print out the check list.
Before the test, be familiar with information about the NodeB to be
checked, such as the site location, cell ID, scrambling code, omni-
directional/fixed-directional site, and antenna azimuth.
Page 18HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Chapter 1 Overview of Single Site Verification
Chapter 2 Preparations for Single Site
Verification
Chapter 3 Test Contents of Single Site
Verification
Chapter 4 Cases of Single Site Verification
Page 19HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification
Test contents
Test scope
Site selection
Location selection
Route selection
Test items
Page 20HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Scope
Test scope
Scrambling code check: Check whether the scrambling code or
frequency received by the UE/Scanner are consistent with planned
ones. In this way, you can infer whether the downlink feeders are
connected reversely.
Frequency check: Query the frequency number in the current cell from
the handset in engineering mode.
Coverage check: Know the downlink coverage of the cell by checking
the CPICH RSCP and CPICH Ec/Io.
Ordinary voice service, VP service, and PS service test: Ensure that the
basic functions such as cell access and call are proper.
RX antenna diversity test: Check whether the uplink antenna system is
reversely connected.
Page 21HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Site Selection
Site selection
When time is limited, select a certain proportion of sites (10%-15%)
to be checked after effective communication with the operator.
Sites are selected in accordance with the following principles:
Site with key coverage areas
Site with predicted high traffic
Site with large coverage areas
Site satisfying the requirements of operators
If the operator is also the 2G network operator, select the site in
accordance with the key coverage area and traffic of the 2G
network.
Page 22HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Location Selection
Location selection
The current 3G test handset does not have the descrambling function. The
cell to be measured arranges the test location to ensure proper test
services. The test is performed in the test location where the signals of
target cell are strong, and signals of other cells are weak.
The cell to be measured arranges the test location to ensure proper test
services. Ideally, the test personnel cooperate with the engineering
personnel to disable the power amplifier of other intra-frequency cells except
the cell to be measured. Thus, only signals in this cell are maintained. In this
case, no requirements for the location selection are available.
Page 23HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Location Selection
Location selection
If the power amplifiers in other cells cannot be disabled, the test point
should be near the center of the cell, with line-of-sight distance to the
NodeB. In this way, better coverage and little signal fluctuation are
implemented. For a macro cell, the test spot should be less than 100 m
from the NodeB in the direction of major beam of cell antenna, with line-of-
sight distance to the NodeB.
The test spot should not locate right under the NodeB because other
sectors in the same NodeB also have strong signals, which cannot ensure
that the test is performed in the cell to be measured. The test spot is
determined by observing CPICH RSCP measured by the Scanner.
Page 24HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Location Selection
Location selection
The test spot is determined according to the strength of the
CPICH RSCP. Ensure that the CPICH RSCP in the cell to be
measured is strong and that of other cells is weak. In addition,
the change amplitude of CPICH RSCP in cells should not be
excessive.
Notes: If the operator is the 2G network operator, and the 3G
network and 2G network share one site, the test spot is
determined with reference to the coverage of 2G sites.
Page 25HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Route Selection
Route selection
Test points in sectors of the same site should be on the test
route. To avoid coverage test, the route should be clear of
building signal blocking.
Sector1
Sector 2
Sector 3
Test Point 1
Test Point 2
Test Point 3
Drive Test Route
NodeB
Page 26HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Test Items (1)
Test of scrambling code, frequency, and LAC/RAC
Objectivity: Check whether the scrambling code, frequency, and
LAC/RAC are consistent with planned ones by the drive test. Check
whether the TX signals of a certain cell are connected to the antenna
system of other cells.
Descriptions
If the power amplifier of neighboring cell is disabled, check whether the
scrambling code and frequency are consistent with planned ones. In
addition, check whether the signal strength of the corresponding cell is
consistent with that as planned.
If multiple carriers are not applied to a certain site, you need not to
observe the signal frequency.
Page 27HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Test Items (1)
Test of scrambling code and carrier
Method
When the test UE works in idle mode, check whether the
frequency, scrambling code, and LAC/RAC of the cell is
consistent with planned ones.
Page 28HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Test Items (2)
Test of signal coverage
Objectivity: Through the drive test, check whether the CPICH RSCP and
CPICH Ec/Io received by the scanner or UE are greater than the preset
thresholds. Ensure that the TMA works properly, the antenna connection
is proper, the antenna tilt and azimuth are consistent with those as
planned, no building blocking is available.
Descriptions
− Closely related to the site type (macro cell or micro cell) and loading, the
CPICH RSCAP and CPRICH Ec/Io should be set after communication
with operators.
− If the operator is the 2G network operator, and the 3G network and 2G
network share one site, check for signal coverage problems by
comparison with the coverage of 2G site.
Page 29HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (2)
Test of signal coverage
Method
When the test handset works in idle mode, check whether the
RSCP and Ec/Io of the cell are proper.
Page 30HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Test Items (3)
Call test
Objectivity: Through call test, check whether the calling and called voice services are
proper and the voice quality is in good conditions. Ensure that the calling and called VP
services are proper, and voice quality and image quality are in good conditions. Ensure
that the call of PS service and PS service rate are proper.
Descriptions
− Ideally, in the equipment room at the site, When the engineering installation personnel
perform the device commissioning and installation, the power amplifier is disabled to
ensure the test in the target cell.
− The voice quality and image quality are determined by the subjective feelings of the test
personnel.
− The PS service rate is related to the customer subscription rate, and may be affected by
the bit error repeat and spending of different layers.
Page 31HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification-Test Items (3)
Call test
Methods
− Use test UE to perform the voice call test in each cell, and check
whether the voice unclarity, voice discontinuity, and one-way audio
occur based on subjective feelings.
− Use test UE to perform the VP call test. Check whether the mosaic
appears on the video.
− Browse web pages in each cell, access one page to experience the
Internet connection rate. Check whether the download rate displayed
on the Probe meets the test requirements.
Page 32HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4)
Antenna diversity test
− Objectivity: Check whether the antenna for receiving diversity
signals is reversely connected.
− Antenna diversity test is optional.
Page 33HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4) Antenna diversity test
Method 1: Cross-connect feeder check
Connect the two feeders of the cell to be measured to the top of the cabinet so that the
output power take-off (PTO) is transmitted through another antenna. Check whether the
CPICH RSCPs received by the UE/Scanner before and after the cross-connection
change significantly. If no changes are available, you can infer that the RX antenna
system is connected properly. In normal situations, the change of CPICH RSCP before
and after the cross-connection should be less than 2 dB.
Page 34HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4)
Antenna diversity test
Method 2: Test UE is set to transmit signals at the fixed maximum power
If the test UE supports the transmission at the fixed maximum power (Huawei U626, for example), you need not to change feeders in the equipment room. Instead, set the UE to transmit signals at the fixed maximum power to perform the test.
− When the UE works in idle mode, the uplink RTWP monitoring of three cells of the NodeB under test is initiated.
− The service access is implemented in the direction of antenna main lobe in the cell to be measured. If the RX diversity antenna is connected properly, only the RTWP of this test cell increases remarkably. Otherwise, the RTWP in other sectors also increases.
− In this way, you can check whether the RX antenna diversity works properly.
Page 35HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4) Appendix: Method for tracking the RTWP–step 1
Query the slot number of RF modules of cells in the NodeB through the NodeB LMT.
(MML command: LST LOCELL)
Choose Realtime Specific Monitoring > RTWP Measurement, as shown in the following
figure.
Page 36HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4)
Appendix: Method for tracking the RTWP–step 2
Enter Suback No., Slot No., and Report Period (s).
− Suback No. is the sub-number of the RF subrack in the NodeB,
provided by the NodeB operating and maintenance by default.
− Slot No. is the MTRU slot No. for the NodeB displayed in the
preceding page.
− Report Period(s) is the report period of the tracking RTWP data,
which is set to 1s by default.
Set the path and name of the tracking file. Select AutoSave, and
then the file is saved under the default path. You can also click the
red block on the lower right to set the path.
Page 37HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Single Site Verification–Test Items (4) Appendix: Method for tracking the RTWP–In the following dialog boxes of RTWP tracking,
three cells are tracked.
Page 38HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Chapter 1 Overview of Single Site Verification
Chapter 2 Preparations for Single Site
Verification
Chapter 3 Test Contents of Single Site
Verification
Chapter 4 Cases of Single Site Verification
Page 39HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Cases for the Single Site Verification
Cases for the single site verification in a certain test location
This case only serves as an example. The procedures of single site
verification are described as follows:
1. At the selected test point, enable Huawei U626. The prompt of 3G
network connection is displayed on the screen.
2. Select Application, and then the test UE enters the test mode. Test
Mode is displayed on the screen.
Page 40HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Cases of Single Site Verification
3. Choose WCDMA > Network Information, and the basic
information of the current network is displayed on the screen,
which includes frequency number of uplink UL/downlink DL,
scrambling code, frequency, RSCP, Ec/Io, LAC, and RAC.
4. Check whether the cell frequency and scrambling code displayed
on the UE are consistent with the planned ones.
Page 41HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Cases of Single Site Verification
5. In the test data of the scanner or UE, check whether the CPICH
RSCP is greater than –85 dBm, and the CPICH Ec/Io is greater than
–8 dB. Record the values in the test form. (Notes: The scanner
antenna is positioned outside the vehicle and the UE antenna is
positioned inside. Thus, the test data obtained by the scanner and
UE are different. If the CPICH RSCP and CPICH Eo/Io are measured
by the UE, Io and Ec/Io are obtained. Ec of CPICH RSCP = Ec/Io +
Io).
6. Call test between the 3G handsets includes voice and VP services.
You need to end the call immediately after the call is put through.
Page 42HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Cases of Single Site Verification
7. Perform the PS test by using handset and laptop. Refresh a web
page or download a file to check whether the rate meets the
requirements.
8. Ask the engineering personnel to cross-connect the two antenna
systems in the same cell. Then, check whether the CPICH
RSCP is consistent with the one recorded before. In normal
situations, the difference before and after the cross-connection
should not exceed 2 dB.
9. Stop the file recording at the appropriate test point in new sector.
The test in another cell starts.
Page 43HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential
Summary
The single site verification is performed to check whether the devices work
properly, which lays a sound foundation for subsequent RF optimization and
service optimization. The test focuses on the verification and solutions to the
device function problems and engineering installation problems. In the single
site verification, the test personnel should cooperate with product support
personnel and engineering installation personnel to ensure the implementation
in good quality.
The content tailor and counters of the single site verification are specified
according to practical network operation after effective communication with
operators. The test contents are specified to ensure the progress and effective
problem location.
Thank you
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