rf drive testing

05/01/2023 RF DRIVE TEST 1

RF Drive test

Under the guidance ofDr. Ravikumar. M.S M.tech, PhD, MISTE Professor & H.O.D.

By ARPITHA G.ADEC,4KV10LEC01

KVGCE,SULLIA


contents• INTRODUCTION• TYPES OF DRIVE TESTING• STUDY OF KPI• DRIVE TEST TOOL PHYSICAL SET UP• DRIVE TEST PROCESS • STEPS• OPTIMISATION SOLUTION• ADVANTAGES• CONCLUSION


INTRODUCTION

• measuring and assessing the coverage, capacity and Quality of Service of a mobile radio network.

• motor vehicle containing mobile radio network air interface measurement equipment - detect and record


Types of drive testing

Network benchmarking: to measure several network technologies and service types simultaneously to very high accuracy, to provide directly comparable information regarding competitive strengths and weaknesses.

• Result: comparative data network speed analysis.


Contin…Optimization and troubleshooting: used to aid in

finding specific problems during the rollout phases of new networks or to observe specific problems reported by consumers during the operational phase of the network lifecycle.

• Result :In this mode drive testing data is used to diagnose the root cause

Service quality monitoring: making test calls across the network to a fixed test unit to assess the relative quality of various services using Mean opinion score(MOS).


STUDY OF KPIs

– area level– cell level– TRX level. Area-level KPls can include– SDCCH requests– dropped SDCCH total– dropped SDCCH Ab is failures– outgoing MSC control handover (HO) attempts– outgoing BSC control HO attempts– intra-cell HO attempts, etc.


Conti..

DRIVE TEST PROCESS• Selection of the 'live' region of the network• Selection of the drive testing path.• To have the appropriate kits including• – Mobile equipment (usually three mobiles)• – Drive testing software (on a laptop)• – A GPS (global positioning system) unit.


DRIVE TEST TOOL PHYSICAL SET UP

Drive Test Equipments for Voice & PS call Tools• handset• Laptop and adapter• scanner


DRIVE TEST PROCESS

• Two mobiles are used to generate calls with a gap of few seconds (usually 15-20 s).

• The third mobile is usually used for testing the coverage.• It makes one continuous call, and if this call drops it will

attempt another call.• To collect enough samples at a reasonable speed and in a

reasonable time.• If there are lots of dropped calls, the problem is analysed

to find a solution for it and to propose changes.


STEPS

• Drive Test Equipments• Laptop Configurations• TEMS Investigation - Workspace Configurations- Map Configurations- Port Equipment Configurations- Command Sequence Configurations• Go Drive Test • Logfile Checking• Post Processing - Report Generator- MapInfo (Plot IEs)• Trouble Shooting - 2G Frequency Scanning- Time Slot Check- TRX Check- Swap Feeder Check


Drive Test Equipments and Laptop Configurations

• Power ManagementSet Power Management Laptop always On :Start -> Settings -> Control Panel -> Power Options -> Set All Power Scheme “never”

• Virtual MemorySet Virtual Memory :Start -> Settings -> Control Panel -> SystemAdvance -> Performance Settings


TEMS Investigation• After installation process, open TEMS Investigation.>> All Programs ->

TEMS Investigation -> Data Collect1. Open Worksheet Map & arrange size of window Map2. GPS (Presentation -> Positioning -> GPS)3. Port Configuration (Configuration -> Port Configuration)4. Command Sequence (Control -> Command Sequence)5. Serving + Neighbours GSM (Presentation -> GSM -> Serving + Neighbours

GSM)6. Current Channel (Presentation -> GSM -> Current Channel)7. Event (Presentation -> Signalling -> Events)for benchmark workspace, add Serving + Neighbours GSM and Current

Channel for MS3.


Creating a cell and mapCreate Geoset : Click Geoset

Manager on Map window • On layer control remove all

layer except Pinpoint, Cell, Event, AMR, RF Quality and Coverage layer

• Add layer Route, Road, MCOM Site, and other tab

• Save Geoset• Load Cell file : Configuration ->

General -> Cellfile Load• Use Cell Definition File then

choose cell


Port configuration1.Click window Port configuration -> insert (in keyboard) or click icon 2. Select Port for Mobile Station MS (port MS usually have higher number than port

DC. i.e there is COM 5 and COM 6, the DC port is COM 5 and the MS port is COM 6).Herewith the example of command sequence in TEMS 6.1.4

Voice Call CS i.e “120/15” means 120 second on call then call end, 15 second wait and then call again.

1. Loop Start give the number of repetition for command below the loop start (General -> Loop Start)

2. Dial select the MS and give the destination number (Voice -> Dial)3. Synchronize to synchcronize MS before go to the next command (General ->

Synchronize) 4. Wait 120 wait 120s on call (General -> Wait)5. End Call (Voice -> End Call)6. Wait 15 wait 15 before call again (General -> Wait)7. Loop End (General->LoopEnd)


Contin..Video Call CS In general cs for

video call is same as voice call, but in video call in dial command we must add “v”.i.e

• Loop Start• Dial v081384760975• Wait 120• End Call• Wait 15• Loop End


Contin..1. Configure Recording Properties :

Menu Tab Logfile -> Recording Properties

2. Select recording folder : Click Browse -> Select Directory

3. Select Quick logging and setup size of swap file “after reaching message “

4. Use 2G or 3G configured workspace (with spacific map : road, route, cell file)

5. Make sure all equipments configured to the right port

6. Connect all


Contin..

7. After all equipments connected (symbol green), window gps, serving neighbour gsm, current channel and events will be full filled

8. lock TEMS Handset into GSM only or 3G only.


Contin..

9. To start drive test, click record then start command sequence


Contin..10. After all route complete, wait untill call end then stop command sequence and stop recording.


Contin..

1. Open TEMS Data Collection : Start -> TEMS Products -> TEMS Investigations6.1.4 Data Collection

2. Menu Tab Logfile -> Report Generator

3. Add logfile4. Setup Output directory


Contin..

5. Setup Report properties6. Setup IEs, Events,

Mobiles, and User Details


Contin..

7. Result of Report Generator


Contin..

• Before post process in mapinfo, created *.tab file from logfile in TEMS

1. Export logfile : Menu Bar Logfile -> Export Logfile

2. Click Add Order 3. Choose Format :

MapInfo Tab-file


Contin..


Contin..

• Open the exported file into MapInfo : Menu Tab File -> Open

• Create Thematic Map : Menu Tab Map -> Create Thematic Map

• Choose Type -> Range• Template Name ->

Region Ranges


Contin..

• Choose Table and Field (ie. Plotting RXQUAL_SUB from Dedicated mode)

• Customize Ranges, Style and Legend.


Contin..• EVENTS on RXQUAL_SUB• Create Events on

RXQUAL_SUB• Open again the exported

file (Ded_orinaica)• Create Thematic Map :

Menu Tab Map -> Create Thematic Map

• Choose Type -> Individual• Template Name -> Region

IndValue Default


Contin..

-50 dBm -60 dBm -70 dBm

-50 dBm -110 dBm

Away from the site

SIGNAL STRENGTHHOW STRONG THE SIGNAL IS

SIGNAL QUALITYHOW CLEAN THE SIGNAL IS

GOOD AVERAGE BAD

As you go very far away from site not only does the strength reduceThe quality also reduces

Quality problems can occur close to the site or far away from the site

Telecom Terminology

GSM

Rxlevel

RxQual

BCCH TCH

UMTS(3G)

RSCP

Ec/Io

PSC

LTE(4G)

RSRP

RSRQ/SNR

PCI

Technology

Received Signal level

Received Signal quality

Channels

Good RF ConditionGOOD RF CONDITIONS ARE DEFINED BY GOOD SIGNAL STRENGTH AND GOOD QUALITY

GSMRSSI > -70dB

UMTSRSCP > -70dBEc/Io > -7dB

LTERSRP > -70dBSNR > 15dB

HANDOVER

1 2 4

HANDOVER BETWEENSECTORS OF THE SAME SITE THIS IS CALLED

INTRA SITE HANDOVER

3

1 2 3 4

HANDOVER BETWEENSECTORS OF THE DIFFERENTSITE THIS IS CALLED

INTER SITE HANDOVER


SPIDER GRAPH

Activate spider graph : Menu Tab Tools -> Tool Manager

• Spider Graph Load and Autoload

• See table structure of cell in MCOM Site : Menu Tab Table -> Maintenance -> Table Structure -> View/Modify Table choose MCOM Site


Contin..

• From Spider Graph, We can analyze :

• - Dominant Cells• - Overshoot Cells• - Swap Feeder


Contin..


Contin..

to verify level signal each BCCH ARFCN plan

1. Setup frequency scan : Click Scan Properties

2. Select channels : Tab Scanned channels -> Manual selection -> Select

3. Setup Selected Channels (ie. BCCH ARFCN are 95-113)

4. Decode BSIC


Contin..

• Start Scanning : Click toolbar Start Scanning

• See Scanner Bar Chart Window : Menu Bar Presentation -> GSM -> Frequency Scanner -> Scanner Bar Chart


Check Time Slot in each TCH (if Freq Hop : NO or Base Band)

• Setup Channel Verification : Menu Bar Control -> GSM Channel Verification

• Setup test phone number : Click Properties on Channel Verification window


Contin..

• Green means time slot has been assigned


To verify damage TRX in each sector

• Lock BCCH ARFCN certain sector : Click Toolbar Lock on Channel (ie. Check TRX Sector 1, Lock BCCH 111


Contin..

• Disable Handover : Click Toolbar Disable Handover

• See MAIO on Current Channel window


To verify installation mistake on feeder cable to BTS

• Lock BCCH ARFCN each sector : Click Toolbar Lock on Channel (ie. BCCH Sect 1 = 547, Sect 2 = 540, Sect 3 = 543 )

• Set HO Target : Equipment Properties -> Dedicated Mode -> Function -> Target HO (ie. BCCH 547, 540, 543)


Contin..

• Create drive route that can represent each sector

• Export logfile into *.tab with IEs CI

• Create thematic map for each CI (Cell Identity)


OPTIMISATION SOLUTION

• Moving antenna locations• Altering antenna heights• Changing ARFCNs• Antenna orientation adjustment• Rectifying the faults in the steps followed

before finalisation of Radio network planning.


ADVANTAGESTEMS Cell Planner Universal is Ericsson´s tool for mobile radio network planning. It is a– highly graphical– easy-to-use– PC-based tool for design– Realization– Optimization of mobile radio networks It assists the user in a number of complex tasks,including– network dimensioning– traffic planning– site configuration– frequency planning.• It supports for– WCDMA– GSM 850,GSM 900,GSM 1800,GSM 1900– iDEN– CDMA,CDMA2000 1xRTT– TDMA/AMPS– NMT 450, NMT 900– TACS, and E-TACS.– GPRS and EGPRS (EDGE) in GSM system.


CONCLUSION• RF drive test using TEMS offers solutions for– Planning– Development– Optimizing– Troubleshooting– Expanding mobile networks• Optimized networks mean lower operational costs.• TEMS products allow efficient monitoring, diagnosing and

benchmarking in order to make best use of available resources.• They also enable engineers to troubleshoot problems quickly.


REFRENCES

1. www.telecomhall.com2. aster.in/..../network_optimization.html3. en.wikipedia.org/wiki/Drive_testing4. www.ijettjournal.org/volume-4/issue

http://www.telecomhall.com/


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rf drive testing

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