Transcript File

FIELD TESTING
of
2G 3G Devices
Field Trials conducted on terminals ensure that the interoperability of
the terminal with the public networks will be robust and minimizes
returns from the market.
Development Cycle
Product
Planning
•Platform Design & Reference Architecture
•Full protocol stack and man machine interface software
•Functional and Performance Specifications
•Protocol Testing (RF/USIM/Protocols)
•Pre-Conformance-physical & signaling)
•Power consumption testing
Product Validation
(LAB Testing)
Product validation
( Field Testing)
•Check All the Reported issues should be
closed.
•Carrier approval confirmation.
•Operator Acceptance.
A quick review of all the major issues
Reported.
Field Trial.
OEM/Operator Specific requirement.
Production Issues.
•Live Network Testing
•IOT
•Inter-RAT
•Field Trials
•KPI
•DATA performance testing
Final QA
Commercial Sample
QA
Live Network Field Trials & IOT
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Field Testing is carried out with the product connected to a live network in real
conditions. Field trials give confidence in end to-end product performance. This
highlights software quality and stability issues and how the product performs for the
customer. This testing can be carried out to customer-specific requirements, network
operator requirements or to the GCF field trial recommendations.
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References :
DG 11Field Trial Guidelines
3GPP org
Test Case provided by:
• OEM/ODM
• Operator Acceptance
• User Acceptance (UAT)
Features Tested in a Field Trials
Some of the features tested in a field trial are:
• Cell selection and reselection
• Network selection
• Location updating
• Speech quality (FR / HR / EFR, AMR)
• Roaming
• Hand over (GSM/GPRS)
• Signal strength
• Routing area updates for GPRS
• GPRS attach and detach
• GPRS PDP activation and deactivation
• Verification of different QOS Parameters.
• TCP/IP traffic (UL/DL) with different Multi slot configurations
• GPRS Authentication
Field Test Preparation
• Field test objective definitions (Performance Test: RF Drive test, Call
Test )
• Diagnostic monitor*
• Laptop computer
• Test and reference mobiles, chargers, extra batteries, etc.
• Mass storage device
• GPS receiver ( For guided RF Drive Test , normally applicable to
typical topographies)
• Data/RF cables
• Dual UART for data testing
• Extension cord (s)
• USIM/ RUIM card reader/writer along with its software (for RUIMcapable mobiles)
Field Testing Tools
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Phone Flashing Tool:
Generally these tools are used to download or upgrade the software in phone using desktop/laptop
with the help of data cables.
Logging/Tracing Tool:
Tracing tool are used to capture the message of device, exchanged between the different layer and
with network while in operation .This help in debugging the errors and problem with the device or
network.
Field Testing Tools
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DUT and reference device:
– During a testing phase of a device there should be a reference model for benchmarking and
comparing the performance of the DUT.
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Engineering Mode:
– Engineering Mode is designed to allow a field engineer to view and test the network
information received by a handset, when the handset is either in idle mode or dedicated mode
(that is: with a call active). In each mode, the engineer is able to view network interaction for
the “serving cell” (the cell the handset is currently registered with) or for the neighboring cells.
Test cases:
– Test Case of OEM/ODM (Open Market)
– Test Case Operator Acceptance (operator specific)
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QM Management tool:
– Web based Defect tracking tool, Repository & Centrally Controlled Tool
– Organize & Manage all Phases of Testing Process
– Specifying Testing Requirements
– Planning Tests
– Executing Tests
– Tracking Defects (e.g.. Test Director)
Test Environment
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Dense Urban
Dense urban environments consist of lots of multi paths, and 4-, 5-, and 6-way handoffs are
highly visible. Also, the network is usually loaded.
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Urban
Urban environments also have enough multi paths to test 3-, 4-, 5-, and 6-way handoffs. The
network is usually loaded, as well.
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Suburban
There are some multi paths present in suburban environments, but not a lot. Usually, 1- or 2-way
handoffs are normal, and the network is lightly loaded. The mobile may not be locked to one
active Pilot in traffic.
Test Environment (Contd..)
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Stationary Environment (MP)
Stationary environments can be divided into near, middle, and far scenarios.
Good (near) coverage area, Rx -70 dBm or better
Medium (middle) coverage area, Rx -70 to -85 dBm
Poor (far) coverage area, Rx -85 to -103 dBm
Most mobile feature and conformance testing is done in a good
GSM/WCDMA coverage area.
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Moving Environment (MR)
Moving environments are very dynamic, and most mobile field testing is carried out in
moving conditions.
25–45 km/h
45–65 km/h
65–100 km/h
Variable speed
Drive test Route Selection
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Test Route
A test route is a prescribed traveling/driving route in a GSM/CDMA/WCDMA coverage area used
for field testing in a real, dynamic RF environment.
Depending on the feature being tested and the test equipment involved, the test route can be walked.
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The test route plays a key role in field testing.
Most field testing of network features can be performed in a stationary location in a good
GSM/CDMA/WCDMA coverage area.
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A drive route may consist of, but is not limited to, these features:
• Various received signal strengths along the drive route (coverage
areas)
• Known cell site locations
• Soft/softer handoff areas
• Boundaries of hard handoff, idle handoff, SID/NID, Zone and IP
registrations, etc.
• Various vehicle speeds along the drive route (stop signs, intersections,
freeways, boulevards, etc.)
• Single- and dual-mode areas, CDMA ,GSM,WCDMA, etc.
• GSM, CDMA,WCDMA boundaries and vice versa
Quality of Service Testing
Network Services are considered end-to-end, this means from a Terminal Equipment (TE) to
another TE. An End-to-End Service may have a certain Quality of Service (QoS) which is
provided for the user of a network service. It is the user that decides whether he is satisfied
with the provided QoS or not.
To realize a certain network QoS a Bearer Service with clearly defined characteristics and
functionality is to be set up from the source to the destination of a service.
A bearer service includes all aspects to enable the provision of a contracted QoS. These
aspects are among others the control signaling, user plane transport and QoS management
functionality.
Measuring Voice and Data Service Quality
Traditionally, wireless operators have used a number of metrics that collectively provide a
measurement of network service quality from the user perspective. Various operators may
define and measure network performance somewhat differently, but overall service quality
will generally be determined by a combination of the following four key performance
indicators (KPIs).
– System coverage
– Call blockage
– Voice quality
– BER bit error rate
Data throughput measurements
Downlink Performance under Mobility Conditions Description
Verify the downlink data performance of EGPRS implementation in live networks.
Reason for test
To ensure that the downlink GPRS/EGPRS/HSDPA data throughput of the ME under test is acceptable under
mobility conditions.
Initial configuration
The MS is GPRS and IMSI attached.
Use the MS in tethered mode as a modem for laptop
Identify a route with 2-3 cell reselections and a Routing Area Update
Test procedure
1. Activate PDP Context
2. Start on the identified route
3. Use DOS FTP to download a 2-15MB file. If possible, utilize a server with minimal latency to the GGSN.
4. Repeat the test 5 times, record the average FTP throughput.
Expected behavior
1. The results of this test are highly dependent upon the number of cell reselections, RAU, and average signal
strength along the drive route. Average downlink throughput under mobility conditions for a two-slot
device should exceed 40 kbps, three-slot devices should exceed 55 kbps, and four-slot devices should
exceed 70 kbps averaged over five FTPs.
2. The data histogram for each test run should indicate relatively few data stalls in excess of 10 seconds.
3. The GPRS connection and file download shall be stable during cell reselection and RAU
Call Performance Criterion
All The Short/Medium/Long Call Made during A CP Test Should be under following Test
Condition
– Half Rate Channel
– Full Rate Channel
– Enhance Full rate Channel
RX Sensitivity (RxLev and Rx_Qual)
Short/Medium/Long Call Made during A CP Test Should be under following Test
Condition
Attempt Call in Low Network Area and low RxQuality when
Rxlev <20(90 dbm) and upto RxLev ~5 (105 dbm)
RX Quality (full)
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0 - less than 0.2% bit errors
1 - 0.2 - 0.4% bit errors
2 - 0.41 - 0.8% bit errors
3 - 0.81 - 1.6% bit errors
4 - 1.61 - 3.2% bit errors
5 - 3.21 - 6.4% bit errors
6 - 6.41 - 12.8% bit errors
7 - more than 12.8% bit errors
RXLEV value 0(-110 dbm) to 63(-48 dbm)
– RXLEV 0 = less than -110 dBm.
– RXLEV 1 = -110 dBm to -109 dBm.
– RXLEV 2 = -109 dBm to -108 dBm.
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– RXLEV 62 = -49 dBm to -48 dBm.
– RXLEV 63 = greater than -48 dBm.
Multimedia Testing
Testing of multimedia services and next-generation handsets is critical to their successful
launch and adoption. However, quality and functional testing of mobile multimedia
applications is not a trivial task, and is distinctly different from testing traditional broadcast
and network-based video services. Developers must contend with network reliability
problems, handset interoperability issues, multiple operating systems, and variations in
service delivery platforms.
Application Testing
Application testing and signing programs perform testing at the application-acceptancetesting level to ensure that your application meets the model’s requirements. This means
that Symbian Signed and Java™ Verified Program criteria documents must be used when
considering application requirements.