drive test procedures with parameter details

Tems Investigation Test Procedures

TEMS INVESTIGATION TEST PROCEDURES

OPTIMUM NETWORK SOLUTIONS INC.

Drafted by: Ufuk Yurtsever Date: 12.01.2008

Reviewed by: Kerem Özyetkin Date: 21.05.2008

Reviewed by: Orhan Uzgidim Date: 23.05.2008

Reviewed by: Zaid Salman Date: 26.05.2008

Approved by: Ufuk Yurtsever Date: 27.05.2008

Optimum Network Solutions Inc.1


CONTENTS: 1‐ INTRODUCTION 2‐ SETTING UP THE EQUIPMENT 3‐ SETTING UP TEMS INVESTIGATION 4‐ GSM VOICE CALLS 5‐ SCANNER MODE 6‐ DEDICATED MODE 7‐ IDLE MODE 8‐ GPRS TESTS 9‐ HOTSPOT(LANDMARK) TESTS 10 BENCHMARK‐ TESTS 11 SINGLE‐ SITE CHECK 12 GLOSSARY‐



1 INTRODUCTION:‐ This document is prepared to be used as a manual while preparing for and performing a GSM and/or GPRS‐EDGE test by the Drive Test Engineer/Technician. The drive test tool described throughout this document is TEMS Investigation version 7.1.3 and 8.1.3 By completing this document, reader will be able to setup a drive test kit, to perform a GSM, GPRS, Hotspot (Landmark), Swap or Benchmark drive test.

Typical DT Setup



2 SETTING‐ UP THE EQUIPMENT In order to be ready for a drive test, the following equipment should be ready:

1. A laptop PC with at least one USB port.(mandatory) 2. A USB HUB (1 to 4) (preferably a PCMCIA Express USB hub) 3. TEMS Investigation SW (7.1.3 and 8.1.3 are used as of today) (mandatory) 4. TEMS Investigation Dongle(mandatory) 5. An MS compatible with TEMS SW i.e. Sony Ericsson W600i, K600, K790,

K800.. (mandatory) 6. Data cable for the MS(mandatory) 7. A GPS (Garmin Etrex Legend, Delorme), GPS shall have NMEA 0183

interface. (mandatory) 8. RS232 to USB Converter (if GPS interface is RS232) 9. External antenna adapter for the MS (if needed) 10. External antenna for the MS (if needed) 11. Car Holder for the MS(optional) 12. Inverter (to supply power for PC during the test) (mandatory) 13. A simcard for the operator to be tested(mandatory, except scanner test)

External Antenna Adapter PCMCIA Express 4 port USB HUB

Car Holder for K790 0 dB Gain External Antenna



3 SETTING‐ UP TEMS INVESTIGATION 7.1.3:

The first thing to know is the communication port to the MS is connected, the way to do that is by opening device manager and looking for the connected modems. After finding the correct modem related to our phone, go to properties, advanced tab, and advanced port properties. The below picture depicts this process, as easily seen the com port for the modem here is Com13.

Searching for the correct Com port for the Phone Modem.

Next step is opening TEMS Investigation program. There will be two consecutive ports in the TEMS Port Configuration window, in the Ctrl & Config Tab. The smaller port will be assigned to DC (Data Cable) and the bigger port will be assigned to MS (Mobile Station)

Below is the example for that process:



3.1 SETTING‐ UP TEMS INVESTIGATION 8.1.3:

By connecting the USB cable to the PC. MS will be assigned as MS1 and DC will be assigned as DC1 automatically.(There is no need for port configuration (manually)) Below is the example for that process:

After identifying the equipment, MS1, DC1, GPS, the test can be started.



4 GSM‐ TESTS:

An MS is always in CS Mode when performing Voice Call. The steps of an ordinary GSM Voice Call is listed below:

1. Idle Mode (MS is not in a call, only cell reselecting along the way) 2. Call Initialization (Number dialled) 3. Call Attempt 4. Dedicated Mode 5. Call Setup 6. Call Established 7. Handover 8. Call end 9. Idle Mode

GSM Voice Call Steps. In GSM tests MS can be used in different modes:

• Scanner Mode • Dedicated Mode • Idle Mode

4.1 SCANNER‐ MODE: In scanner mode, we usually give a number of frequencies to be scanned by MS. e.g. in Vodafone network it is 21 30,‐ 40 79.‐ Let’s go over the steps to setup an MS in scanner mode. First of all, there is no need to use a SIM card for an MS to be used in scanner mode. After connecting the MS to

TEMS investigation we will use this button ( ) to enter the frequencies to be tested. The below window opens:

Optimum Network Solutions Inc.

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Check decode BSIC, and click channel selection. Decoded BSIC information is used for identifying the transmitting base station

As depicted above enter the frequencies to be tested, e.g. this time it is entered 21‐30, 40‐79 for BCCH carriers of Vodafone.

After that click this button ( ) to start scanning. When you choose scanner tab in TEMS Investigation the below screen appears.



As illustrated above, you can see all the frequencies under test from strongest to weakest at the top window, all frequencies from 21 to 79 in the number order on the middle window and the respective signal strengths of the strongest frequencies on the bottom left window. Only thing left is to push the record button and start frequency test while recording the log files. This mode is usually used in Landmark (Hotspot) tests. 4.2 DEDICATED‐ MODE: In dedicated mode, MS performs a voice call; there are two types of DEDICATED MODE calls generally accepted long call and short call. 4.2.1 – Long Call: The usual way to start and stop the calls manually, but it is recommended do it is by preparing a command sequence (with long call Duration) in order to automatically start and stop voice calls. Also most of the operators usually ask for definite call duration during the tests. In long call MS performs a call continuous duration, some Operators ask for a long call that the MS performs a call (like 15 minutes) and waits 15 seconds to start the second call. 4.2.1 – Short Call: The way to do this is that you should prepare a command sequence to automatically start and stop voice calls.



In short call MS performs a call with short call duration (like 180 seconds) and waits 15 seconds to start the second call. (Call duration is depending on the Operator request) Long call is usually preferred to check the drops or HO failures along the test, whereas short calls usually preferred to check the call setup KPIs, like, Call Setup Success rate, Blocking. There are two examples for long and short calls below:

Short call example



Long Call example

Difference of `short call` and `long call` is only the duration (e.g. 3 minutes for short call and 15 minutes for long call)

During the test, the process shall be as follows;

1‐ Push record ( ) button and choose an appropriate filename for the log

file. i.e. 0608_2.log.

2‐ Start Command Sequence by pushing run button3‐ Wait for the end of the sequence.

4‐ Push the stop button ( )

( )

5‐IDLE MODE : In idle mode tests the aim is to record the behaviour of the MS while it is in idle mode, it is not preferred to use idle mode for coverage recording. However, one can have the cell reselection characteristics of the area if idle mode MS is used. In idle mode test, there is no need for a command sequence. Only thing to be done is record and stop to save a log file.



6 GPRS‐ TESTS GPRS tests are done for measuring pocket data transmission from the selected locations or sectors by the customer. GPRS SESSIONS: The normal mode MS uses for voice calls are “Circuit Switching Mode”. However, GPRS Sessions take place while the MS is in “Packet Switching Mode”. Hence, in every GPRS session MS has to switch to PS Mode, and get back to CS Mode when the session finishes. The general description of a typical GPRS FTP Session is as follows:

1‐ PS Attach 2‐ PDP Context Activation 3‐ Session Start 4‐ Session end 5‐ PDP Context Deactivation 6‐ PS Detach

The below excerpts from TEMS Investigation 8.1.3, Signalling Tab, Events window shows two consecutive FTP sessions with all the above listed events occurring in order.



Two consecutive FTP sessions from TEMS Investigation 8.1.3. Usually FTP and Ping sessions are used to test the GPRS network performance. In FTP test there are two files, one in the FTP server, one in the PC collecting the data in the field. These two files are uploaded and downloaded through the MS using GPRS and the throughputs are recorded in the logs. In Ping test, large numbers of pings are sent from PC to server to see the success rate. MS CONFIGURATION FOR GPRS TEST MS shall be setup for the GPRS connection. These settings are available in the web sites of all GSM operators. A data account shall be created with the necessary username and passwords. MS shall be in “CS Only” mode in order for us to see PS attach and PS detach events in all the sessions. If the MS is left in “PS and CS” mode there will be no PS Attach and PS Detach event in the GPRS sessions. Below are the settings for Vodafone TR network for a Sony Ericsson K790 MS to be enabled for GPRS service: Data Account Name: Vodafone Data Account Type: PS data APN: Internet Username: vodafone


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Password: vodafone Login Request: OFF Allow calls: Automatically IP adress: … DNS adres: … Authantication: None, PAP, CHAP selected Data Compression: Off Header Compression: Off After these settings are done in the MS, there is more to be done on the PC side.

• connect the MS to the PC, • in network neighbourhood, create a new connection, • connect to the network at my workplace, • dial up connection, • choose the modem related to the MS, i.e. Sony Ericsson K790 data modem, • give the connection a name i.e. Vodafone, • the number to be dialled is *99#.

After creating this new data connection, we shall try to connect to internet through GPRS. If the result is positive, we may go on to configure out test equipment with TEMS Investigation. EQUIPMENT CONFIGURATION FOR TEMS INVESTIGATION8.1.3

Right click on MS1 Air Interface for reaching equipment properties



Check the “off” box in the GSM EDGE Capability tab.

Doubleclick on “Data” for opening properties window.



Set Packet Capture to “On” and Packet size to “Full packetsize” COMMAND SEQUENCE After successfully connecting the MS to TEMS SW, the Command Sequence shall be prepared. The below figures will depict the command sequence lines written for the Vodafone TR Static GPRS Tests: Three types of GPRS test command sequences will be used due to customer’s request:

1‐ Comprises of 10 FTP Sessions(5 DL and 5 UL) and 1 ping Session(Stationary)

2‐ Comprises of 20 FTP Sessions(10 DL and 10 UL) and 1 ping Session(Stationary)

3‐ Comprises of 10 FTP Sessions(5 DL and 5 UL)(mobility)

1‐Command sequence below comprises of 10 FTP Sessions (5 DL and 5 UL) and 1 Ping Session (500 pings, 32KB each). In FTP DL, a 240k file is downloaded from FTP server, while in FTP UL a 40k file is uploaded to FTP server. There are wait commands lasting for 5 seconds in between all the sessions and wait commands lasting for 3 seconds between all start and stop record commands.



Command sequence and FTP DL details

FTP Uplink details



PING details 2‐ Same command sequence with only FTP session count difference above (10 UL and 10 DL) 3‐ Command sequence below comprises of 10 FTP Sessions (5 DL and 5 UL). In FTP DL, a 240k file is downloaded from FTP server, while in FTP UL a 40k file is uploaded to FTP server. There are wait commands lasting for 5 seconds in between all the sessions and wait commands lasting for 1 seconds between all start and stop record commands.

Command sequence and FTP DL details



FTP UL details During the test, the process shall be as follows;

1‐ Start Command Sequence by pushing run button( ) 2‐ Wait for the end of the sequence.(for a static GPRS test) 3‐ Wait for a wait command and stop sequance by pushing stop button

( ).(for a mobile GPRS test)

4‐ After finishing the test: ‐ There will be 3 log files with the name comprises of date and log number

for stationary tests. i.e 0521_01, 0521_02 and 0521_03. First one is DL session log file, second is UL and the last one is Ping session log file.

‐ There will be several log files named as above. Log files ending with odd numbers are DL and the others are UL log files.

For the sectorel tests, name the files using format below: ‐ CLName_CellID_DDMMYY_LogNumber .

i.e “CL17_22198_21052008_01” For the location tests, name the files using format below: ‐ CLName_LocationName_DDMMYY_LogNumber.

i.e “CL17_Hacettepe_Tip_Fklts_21052008_02”


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For the mobile tests, name the files using format beolw: ‐ Mob_CLName_StartingTime_DDMMYY_LogNumber

i.e “Mob_CL17_1435_21052008_03”



9‐HOTSPOT (LANDMARK) TESTS Hotspot tests are for measuring the strongest frequencies at the test location. Before starting to the hotspot (landmark) test, tester has to set up 2 MS. One will be used for Idle Mode and the other for Scanner Mode .

During the test, the process shall be as follows;

1‐ Push record ( ) button and choose an appropriate filename for the log file using the format as shown below

‐ MIPrinx_LocationName_MS_DDMMYY_LO1

i.e “227166_Esenboga Havaalani_MS3_21052008_01”

2‐ Wait for at least 5 minutes.


Test will be repeated in two or three places near the location as shown below if it’s possible.



10 BENCHMARK‐ TESTS Benchmark tests done for comparison of network (Vodafone) with other networks (Turkcell and Avea) and measuring strongest frequencies in blacklisted locations. There are two ways to make Benchmark tests:

‐ With one MS and Scanner Test repeats three times at the same route with each provider as MS1 Vodafone MS3 Scanner (with scanner frequencies 21 30,‐ 40‐79) MS1 Avea MS3 Scanner (with scanner frequencies 512 586[1800],‐

1 6,‐ 33‐38) MS1 Turkcell MS3 Scanner (with scanner frequencies 10 19,‐ 81 120)‐ Name the logfiles using format as shown below « siteID_MS1_VF_MS3_SCN_DDMMYY » « siteID_MS1_AVEA_ MS3_SCN_ DDMMYY » « siteID_MS1_TR_ MS3_SCN_ DDMMYY »

‐ With two additional MS and Scanner

Only one test shall be done using all providers at same time. In this scenario, three MSs will have three different simcards and scanner will scan all the frequencies belonging to the different operators. Example: 1 6,‐ 10 30,‐ 33 38,‐ 40‐120 [900], 512‐586[1800] Name the logfiles using format as shown below « siteID_MS1_VF_MS2_TR_MS3_AV_MS4_SCN_DDMMYY »



11 SWAP‐ TESTS

Swap tests are done for checking sites after swapping that has been done by the operator for cabinets, antennas or equipment on sites for newer ones or for another vendor. Site check is being done to find out possible problems which can occur during swap procedure. Generic problems listed below; Cross‐ connection (Or partial cross connection) ‐Hardware problems Missing‐ neighbours Database‐ problems (Coordinate, Azimuth faults) Swap test procedure consists of two kinds of tests: mobility and static. During swap test, two command sequences are used, each for one type of test.

Mobile test is done by making dedicated mode test on a route around the site, command sequence should be as below,



Mobile test command sequence details (Dedicated 150 s / Idle 30 s)Static test is done by making dedicated mode test in points in front of every

sector on site, command sequence should be as below,



Static test command sequence details (Dedicate 20 s / Idle 10 s). Drive test routes and other important matters

In mobile test, we should follow below procedures:

Two‐ circles around the site, one small and one big, if it is possible (Tester will decide the range of circles, according to coverage of site). ‐ Detailed test for every sector in coverage areas of sectors. DT‐ Engineer should check HO from each sector to neighbour cells and back (Neighbours here shall be cells in the other sites, collocated cells are always defined neighbors). In static test, we should follow below procedures: ‐Static call point should be in front of the sector and signal strength should be good (Between 45‐ dbm and 65‐ dbm).



Example for mobility and static swap test routes.

During mobility test, the process shall be as follows:

1‐ Push record ( ) button and choose an appropriate filename for the log file using the format as shown below

‐ mobil_siteid_YYYY_MMDD_01

i.e “mobil_984_2008_0516_01”

2‐ Start Command Sequence by pushing run button( )

3‐ When mobility test finish, wait for a wait command and stop sequence by pushing stop button ( ).



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During the stationary test, the process shall be as follows:

1‐ Push record ( ) button and choose an appropriate filename for the log file using the format as shown below ‐ static_siteid_YYYY_MMDD_01 (For first sector)

i.e “static_984_2008_0516_01”

2‐ Start Command Sequence by pushing run button( )

3‐ When stationary test finish, wait for the end of the command sequence.


After finishing the test: Tester should prepare an excel report for each site which has been tested and all files copied under one folder. File names should be as below: ‐Folder Name; SW_siteid_MM.DD.YYYY logs i.e“SW_984_05.16.2008 logs” ‐Excel Sheet; CLXX_siteid_MM_DD_YYYY i.e”CL08_984_05_16_2008” Mobil‐ Logs;

mobil_siteid_YYYY_MMDD_01

i.e “mobil_984_2008_0516_01”

‐Static Logs;

static_siteid_YYYY_MMDD_01 (For first sector)

i.e “static_984_2008_0516_01”



GLOSSARY PDP Context

A PDP (Packet Data Protocol) Context is a logical association between a MS (Mobile Station) and PDN (Public Data Network) running across a GPRS network. The context defines aspects such as Routing, QoS (Quality of Service), Security, Billing etc.

PS ‐ Packet Switched

In a packet switch networks, data may be transferred by dividing it into small blocks or pieces known as packets. Each packet contains information in its header to allow it to be routed by packet switches across the network. This is a more efficient means of transferring data. An example of a packet switched network is the Vodafone.

Circuit Switching Circuit switching is a process in which a dedicated physical circuit path must exist between sender and receiver for the duration of the call. The switch is employed to connect the various physical paths that make up the end to end connection. Switching takes place within Layer 2 of the OSI (Open System Interconnection) 7 layer model. Call Initialization Call initializing is the step of dialling number for starting a GSM voice call. Call Attempt In a telecommunication system, a demand by a user for a connection to another user. This is the second step of starting a GSM voice call. Note: In telephone traffic analysis, call attempts are counted during a specific time frame. The call attempt‐ count includes all completed, overflowed, abandoned, and lost calls. Call Setup Call setup is the step comes after call attempt that caller starts to hear the calling tone until called user answers the call. Call Established



Call established is the step that the called user accepts the call. GSM voice call starts with this step. Handover

Handover (handoff) is switching of an on‐going call to a different channel or cell.

There are four types of handovers

• Switching channels in the same cell. • Switching cells under control of the same Base Station Controller (BSC) • Switching cells under the control of different BSCs, but belonging to the same

Mobil service Switching Center (MSC) • Switching cells under control of different MSCs.

The first two types of handover, called internal because they involve only BSC, and MSC is notified only on completion of the handover.

The last two types of handover, called external because they involve MSC.

MSC (Mobile services Switching Center)

The MSC performs the telephony switching functions for the mobile network. It controls calls to and from other telephony and data systems, such as the Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN), public data networks, private networks and other mobile networks.

BSC (Base Station Controller)

The BSC manages all the radio‐related functions of a GSM network. It is a high capacity switch that provides functions such as MS handover, radio channel assignment and the collection of cell configuration data. A number of BSCs may be controlled by each MSC.


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