tems training
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Data Mentor Nama : Andu Hanindyo
Posisi Terakhir : Drive Test dan IBS Engineer
Spesialis : In Building Solution, Drive Test
Pengalaman Kerja : - 2002-2006 : Drive test engineer untuk Indosat,
Telkomsel
- 2005-2006 : IBS Engineer untuk Telkomsel, site audit
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TEMS = Test Mobile System
Product by ERICSSON
Solution Tools for Wireless Network to Plan, optimized,
and expand their systems.
A Test tool use to read and control information sent over the air
Interface between the base station and the mobile station in GSM
/cellular system. It can also used for radio coverage measurement
Introduction
WHATS TEMS
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Introduction
WHATS TEMS
Product of TEMS
TEMS Transmitter TEMS Light TEMS Indoor TEMS Investigation TEMS Deskcat TEMS Drive Tester TEMS Pocket
TEMS Automatic
TEMS CellPlanner TEMS LinkPlanner
TEMS Automatic TEMS CellSight TEMS Visualization
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Introduction
WHATS TEMS
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TEMS TEMS INVESTIGATION
Introduction
WHATS TEMS
Software
Handset
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Introduction
WHATS TEMS
TEMS Investigation version:
TEMS Classic/98 : SH888; post process with 3rd-party-s/w TEMS 2 : R230; post process with 3rd-party-s/w TEMS 3 : R520; post process with 3rd-party-s/w TEMS 4 : T68; export from TEMS TEMS 5 : T610; export from TEMS TEMS 6 : various handset; data collection & route analysis TEMS 7 : various handset; data collection & route analysis
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As Drive Test Tools
DRIVE TESTING HIGHLIGHTS
Drive Test = Testing the network in particular area
to give the real picture of the networks performance on the field, with a certain tools.
Drive Test Planning
Implementation
Optimization
Michael pipikakis
Evaluating and Improving
The Quality of Service of
Second Generation Cellular
System
September,2004
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Drive test TEMS
As Drive Test Tools
DRIVE TESTING HIGHLIGHTS
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As Drive Test Tools
DRIVE TESTING HIGHLIGHTS
Drive Test Equipments
Laptop
TEMS
Handset
Notes :
-power supply needed, usually using inverter in the car from laptop, GPS and MS
-GPS should use external antenna
-MS can use external antenna or not use external antenna.
(Use external antenna means measure RxLevel Pedestrian / Street Level)
(Not use external antenna means measure RxLevel In car level) -> more realistic result
If using scenario not external antenna, MS position should be carefully chosen and stable
during drive test
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As Drive Test Tools
MODE OF DRIVE TEST
1. Dedicated / Continuous / Long Call Mode
Making continuous call along drive test activity.
Before starting the route, call the drive test number, ex. 199 for Telkomsel,
And only stop the call when the route (drive test) finish.
To see the quality and coverage of the network
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As Drive Test Tools
MODE OF DRIVE TEST
2. Idle Mode
Along the drive test activity, the MS is ON but no call occur
To see the coverage of the network
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As Drive Test Tools
MODE OF DRIVE TEST
3. Sequential / Qos / Short Call Mode
Creating the sequence of call along the drive test activity
Before starting the route create call sequence, for example:
Create call for 70 s and idle for 10 s.
Along the drive test, play this sequence until the route is finished
To see the real network performance run, when people call
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As Drive Test Tools
SCAN
one of TEMS feature scan all or selected frequencies on the selected spot or route to find the clearest frequency
Clean
Frequency
Application of frequency plan
to find the best frequency to be use in the site to identify interference adjacent channel and co channel
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To See How the Network Runs
THE USE
In PLANNING works:
Drive Test Before Installation Perform drive test before our network implemented. This data later will be compared with drive test after implementation,
to justify.
Drive Test Before SWAP Before swap (change operator network), drive testing needed to compare the current network with the network after swap.
To justify the new network is better than before.
Drive Test Benchmarking Drive test the whole area for the whole active networks, before our network implemented. So when our network implemented, can be competed well.
etc
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To See How the Network Runs
THE USE
In Implementation Works:
Drive Test New Site/ Initial Drive Test Initiate the drive test after a site on-air. Make sure that site perform well after on-air.
Test Call New Site Conducting tests call at a new On-Air site, to justify the performance of a site just after On-Air.
Drive Test Upgrade/Expand TRX After implement new TRX or expand TRX, a drive test performed to justify that site working well with the new TRX.
Drive Test SFH/Hopping implementation After implement SFH/hopping in the network, a drive test performed to justify that this hopping solution working well with the whole
network.
etc
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To See How the Network Runs
THE USE
In Optimization works:
Drive Test Handover/ Add & Delete neighbors Drive test conducted after theres changing in neighbours database. Make sure the add really added and the delete really deleted.
Drive Test before & after Downtilt Downtilt conducting, to get better coverage from each antenna. Drive test performed to make sure the better coverage from each angle
changed.
Drive Test Network Audit Performing drive test activity to maintain the whole network. Could be an annual work.
Drive Test Benchmark performing drive test to get justification about our network. Can compete or not. With comparing the whole network including 'us in drive test.
Drive Test troubleshooting Drive test for special troubleshooting case. Such as, a site that cannot handover from sites surround it, a site that cannot transmit good
signal and cannot achieve its coverage.
etc,
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How TEMS works?
Several measurement is only available and recorded in idle mode (C1,C2 etc)
Several measurement is only available and recorded in dedicated mode (RxQual, SQI, FER etc)
This is happen because of GSM system network works, not because setting in TEMS
There are several option/feature can be activated by user (force handover, lock handover etc)
which change TEMS measurement behavior
IMPORTANT NOTICE :
In GSM network there are a lot of parameters which change the network behavior, it is make the
network very flexible.
Due to this reason, TEMS has ability to monitor network with parameters on (FULL mode) and
with parameters off (SUB mode) for such as RxLev and RxQual.
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When using FULL measurement result? Whenever we want to see BTS parameters settings works at live network
DTX off
When using SUB measurement result ? Whenever we want to see BTS works without parameters
DTX on
How TEMS measure FULL or SUB measurement? TEMS record both SUB and FULL measurement at the same time and at the same log files, it is
just need to set what we wan to see in replay mode.
FULL
SUB
LOG FILE
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To See How the Network Runs
WHAT TO SEE WHAT TO MEASURE
Parameters to See
1. RxLevel
Level of Received signal strength. In dBm or Steps. If the value in form of step substract 110 to
the value to get dBm value.
RxLevel is received power level at MS (maximum RxLevel measured by MS is () 40 dBm
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2. RxQual
Received signal quality level, measured base on BER (bit error rate).
The value is between 0-7, the lower the better.
Better
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3. SQI
The parameter used by TEMS to measure Speech Quality.
SQI has been designed to cover all factors that RxQual lack to measure.
SQI computation considers the factors:
the bit error rate (BER) the frame erasure rate (FER) data on handover events statistics on the distribution of these parameters
Better
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4. Others
FER Frame erasure rate
BCCH-BSIC
Hopping SFH
C/I Interference
TA Time Advance
C1 Path loss criterion parameter
C2 Cell reselection criterion parameter in hierarchical cell structure
To See How the Network Runs
WHAT TO SEE WHAT TO MEASURE
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4. Others
FER Frame erasure rate; See on Radio Parameter windows
ARFCN BCCH-BSIC Absolute Radio Frequency Channel Number of Broadcast Control Channel. Base Station Identity Code Important data of a site
Hopping Indicating if SFH implemented. See on Current Channel windows, on hopping channel, hopping frequencies, MAIO, HSN
C/I The carrier-over-interference ratio is the ratio between the signal strength of the current serving cell and the signal strength of undesired (interfering) signal components. The C/I measurement
function built into TEMS Investigation enables the identification of frequencies that are exposed to
particularly high levels of interference, something which comes in useful in the verification and
optimization of frequency plans.
TA Timing Advance. Valid only in dedicated mode. ; To measure the distance of MS from serving cell. Valid only in dedicated mode. See on Radio Parameter windows.
C1 criteria used for cell selection and cell reselection
C2 criteria used for cell reselection
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To See How the Network Runs
CASES
The examples of How Drive Test can see a Network runs.
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To See How the Network Runs
CASES
1. BTS Down
Get in to the site (whether its new or existing), then see on TEMS display, At parameters BCCH, BSIC. If the intended sites BCCH doesnt appear, the site is Down
If we dont have the site data. We can go the exact position of the site, near/under the antenna. Then see if on the serving cell, the Rxlev is good ( above -60 dBm)
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To See How the Network Runs
CASES
2. Handover
We need to check the handover between sector1 of Site A to sector3 of Site B.
We start at the Site A. Check the parameters on TEMS. Make sure the serving cell now
Is from the sector1 of site A. See the neighbour, if the sector3 of site B appear.
Start the drive test, with dedicated mode, to site B sector3 (specified the route first).
The handover should be occur along this drive test. If its not, note this as a problem. See any possibility of the problem, such as:
the neighbour not appear, possibility havent been created theres other site between theres obstacle Then do the opposite, start from sector3 Site B to sector1 Site A.
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To See How the Network Runs
CASES
3. Swap Feeder
Theres a possibility that we have bad installation, for example swap feeder. Swap feeder occur when the installation switch by mistake, for example the feeder to sector1
Became to sector 2, from BTS.
We can see this from drive test.
For example, we have a site with 2 sectors, with a road in front it, to be covered.
We should have the data of this site, such as the BCCH of each sectors.
We start the drive test from sector 1 to sector 2. While were on sector1 coverage, see if the BCCH of serving cell is the correct one, according to the data we have.
And do the opposite from sector 2 coverage to sector1
sect1
sect2
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To See How the Network Runs
CASES
4. Overshoot
When we get the signal from the site that not close to the current area drive test.
Usually we get bad RxQual and long/bigger TA.
We can suspect this as a overshoot case. This case happen when a site/cell is serving far
away from its area.
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Guidelines
Drive Test Types
1. Drive Test Continuous Route
Drive Test is walk/ drive along the route non stop
2. Hot Spots Measurement
Drive Test only at certain spot (usually critical point), TEMS standing still, no movement for 1-5
minutes but still recording.
Usually for scanning frequency or to investigate more detailed network behaviour
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Guidelines
Drive Test Guideline
1. Preparation
Dont go to the field without a good preparation. Prepare the tools completeness, maps, cars, scenarios, sites data, knowing area we are heading to.
2. Check Tools
Beside checking the tools completeness. Also check each tools if its working well, such as the GPS, inverter, handset, including SIM card.
3. Some Rules
- Avoid to have the same route twice, or go on the same road twice.
- Beware of certain area, such as restricted area, one way street, traffic jam streets.
- Create simple/effective way of scenarios, where to start until finishing the route.
- Good cooperation with driver.
- Make sure the roads on the route, can represent the whole network as samples.
4. Pay Attention
Even if were only collecting data, we must focus on our activity. Avoid the things that can make us re-drive test , such as, data cable unplugged from its MS, forget to turn-off the GPRS
mode when we dont need GPRS to measure, run out GPS batteries, forget to record, forget the purpose of the drive test, assure the data collected is right, pay attention of car speed,
create notes for special events, etc.
5. Reporting and Analysis
TEMS can divided as two, data collection and analysis. After drive test on the field, we must
provide data to be analyze and reported. Make sure we can create a good report and analyze
well, by performing all of the points above.
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Plot
Reporting Guidelines
1. Drive test report basically can be divided as two: Plot and Statistic.
BCCH: 59
logfile floor RxLevel Average % RxQual Data
= 0
BRI1 1 -65.12706271 93%
BRI2 2 -58.26292629 98%
BRI3 3 -57.53480663 87%
Guidelines
Statistics
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2. Before we can create the report, make sure we have the right standard for each value
reported. Such as how many ranges the treshold of RxLevel, and RxQual. The color
ranges of SQI and FER, etc.
3. Export the right data for Plotting. To create Plot report, for example we need the logfile to be mapinfo files. Make sure we have TEMS 4 above, that can directly export the
logfile into mapinfo file. Or, if we have TEMS 3 below, make sure we have third-party
software that can create it, such as GIMS.
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4. For statistic report, usually we only need the excel file and some of mapinfo data.
Each version of TEMS investigation can export the logfile into text file, *.fmt. This
format can open , and manage with Microsoft Excel.
5. Following the standard report of the customers.
Ms
id TIME FRAME POSITION MESSAGE TYPE HEXADECIMAL STRING
LAT LON
MS1 15:41.7 2609056 S 0000.0240 E 00000.0314 PAGING REQUEST TYPE 1 0F 0F 25 06 21 00 05 F4 30 A2 DB CC 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B
MS1 15:43.1 2609362 S 0000.0240 E 00000.0318 PAGING REQUEST TYPE 1 0F 0F 15 06 21 00 01 F0 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B
MS1 15:44.5 2609668 S 0000.0240 E 00000.0319 PAGING REQUEST TYPE 3 0F 0F 4D 06 24 00 30 C3 AC 76 30 C2 33 8E 30 C3 0F AF 30 C3 16 3E 83 2B 2B
MS1 15:45.9 2609975 S 0000.0240 E 00000.0322 PAGING REQUEST TYPE 1 0F 0F 41 06 21 00 05 F4 30 C3 9B 1A 17 05 F4 30 C3 AD 45 2B 2B 2B 2B 2B 2B
MS1 15:46.1 2610013 S 0000.0239 E 00000.0322 IDLE MODE REPORT 0E CF E2 00 0C D0 56 10 4D DA 0F CB D7 10 09 DA 0E 88 00 0F 46 80
MS1 15:47.3 2610281 S 0000.0239 E 00000.0327 PAGING REQUEST TYPE 1 0F 0F 25 06 21 00 05 F4 30 C2 D0 1B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B 2B
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Layer 3 Messages
-To Monitor the event and signaling sent and received by Phone
- List Messages of event and signaling
-Often use in analysis, after Drive Test
completed
-Replay the logfile, click a point on the
route marker on map window,
then see on layer 3 messages windows,
detailed information on the
associated messages appears in this window
-Can double-click each list message from
that window to open a new window
displaying the full contents of the message.
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Scanning Function inside TEMS
TEMS Investigation supports scanning of radio frequency carriers (channels),
using either a ordinary TEMS mobile station or a dedicated frequency scanner mobile,
the TEMS Scanner.
Scanning is handled from the Frequency Scanner window, and here the output of
the scan is displayed, too
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BCCH BSIC Average Rx Level (dBm)
51 35 -104
52 - -115
53 26 -110
54 - -114
55 - -105
56 - -115
57 26 -111
58 - -114
59 - -115
60 - -115
61 - -111
62 - -113
63 - -115
64 - -115
65 - -115
66 15 -110
67 - -114
68 - -114
69 - -114
70 - -114
Scanning Function inside TEMS
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Scanning Function inside TEMS
Procedure:
Selecting Channels
In the Frequency Scanner window, choose the unit to use as scanner in the
combo box.
Click the Measurement Settings button.
The channel selection is handled from the Scanned channels tab:
Checking "Decode BSIC" causes the Base Station
Identity Code to be decoded. It will be shown in the
table to the right in the Frequency Scanner window
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Performing Scan
Presenting Scan
Scanning Function inside TEMS
To start scanning, click the Start Scanning button.
While the scanning is going on, the status bar shows the padlock symbol , indicating that the scanner is busy.
To stop scanning, click the Stop Scanning button.
Bar Chart Line Chart Table
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After Process / Report
Scanning Function inside TEMS
Plot
Spreedsheet
Directly capture Export to Mapinfo
Export to text (.fmt), open and process with Excel spreedsheet
BCCH BSIC Average Rx Level
(dBm)
51 35 -104
52 - -115
53 26 -110
54 - -114
55 - -105
56 - -115
57 26 -111
58 - -114
59 - -115
60 - -115
61 - -111
62 - -113
63 - -115
64 - -115
65 - -115
66 15 -110
67 - -114
68 - -114
69 - -114
70 - -114
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Life time MS measurement equipment maximum 1 year, if more than 1 year need to be re-calibrate
Calibration MSs cost almost the same price buy a new one Ericsson only support 2 version below for re-calibrate (eq : latest version is TEMS 7.0, means only
can re-calibrate handset at version 5)
If MS not calibrated or buy a new one, it will impact into the measurement (such as RxLevel and RxQual) will reduced and not valid => KPI will not achived
TEMS always have bugs (even latest version) both coming from software or from type MS itself, need knowledge to anticipated it (such as wrong RxLevel recorded)
HINTS for MS:
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PC which use for TEMS should turn off any usage of
COM, IR, bluetooth, Wi-Fi,
any accessories attached at
PC should be turn off, set PC
into Maximum Performance at Control Panel-System
Slow PC, low memory, low HD capacity will make MS
disconnected suddenly when
TEMS use for a long time,
same things happened if the
battery of PC/laptop is too hot
Turn off power saving feature in the laptop/PC
Turn off screen saver
It would be better drive test laptop is only for do drive test
not for daily routine
HINTS for PC/Laptop:
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Make sure all connections cable at TEMS system is tight, as well external antenna For indoor drive test, MS position is very crucial because some MS location can increase body
loss or other losses (such as MS put behind laptop or put MS near body)
Avoid doing drive test at busy hour especially will increase loss (eq : a lot of people in the mall will increase body loss, a lot of car in the basement, traffic jam)
For 3G drive test, more user using 3G will reduce quality, do drive test at low traffic is essential
Drive test indoor need constant speed walk test (idle mode slower than dedicated mode) Drive test outdoor should be constant and not to fast ( max 40 km/h inner city and max 60 km/h
outer city)
Drive test recorded more than once at the same route (if possible) because it always given result slightly different. Take the best one as a report
Result Drive Test route for outdoor drive test should be ignored when drive test route inside tunnel, on top of fly over road, below fly over road, bridge. Pay attention that GPS cant work well if no LOS into the sky
HINTS for Drive Test:
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Reference
Ericsson.com/tems Michael Pipikakis, Evaluating and Improving The Quality of Service of Second
Generation Cellular System, September,2004
TEMS Investigation 4.0 Manual TEMS Investigation 2.03 Manual TEMS Investigation 7.0 Product Description
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