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General

1. You say that the carrier to interference value in TEMS Investigation actually reflects carrier to noise. Can you specify how much of the Signal to noise ratio is attributable

to the Interference in the air?

2. Is there a definite link between C/I and S/N, or do we just have to presume that most of the S/N is caused by C/I?

3. Can you scan (only) the BCCH frequencies, as in, can you get the screen to display the C/I or C/N value for a predefined number of frequencies (1...n).

4. I'm using a SlimCase/DriveTest case or a s tandalone NMEA GPS and the mouse pointer is moving all over the place when I'm drive testing. How can I fix this?

5. I have a piece of TEMS Investigation equipment which seems to be broken. How do I get it repaired?

6. What parameters of the radiolink will have impact on SQI?

7. What speech coder versions do the SQI supports?

8. Does the SQI show the quality on the uplink channel?

9. If I send speech to the TEMS Investigation mobile, how will this influence the SQI? Will the language, loudness or speaker(male/female) have impact on the SQI?

10. How often is the SQI updated in TEMS Investigation?

11. How is the SQI related to a typical sentence of a few seconds?

12. We use Frequency Hopping, how will this affect the SQI?

13. We use DTX Discontinuous Transmission), how will this affect the SQI?

14. How is the SQI scale constructed and what are the possible values for SQI?

15. What SQI values are indicating bad, good or very very good speech quality?

16. Why are you not using MOS (Mean Opinion Score) when presenting the SQI?

17. What is the range of SQI?
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18. I'm trying to copy my export setup (i.e. *.mex, *.aex, *.pex) files to another computer, but my Name and No Data columns are blank

19. Why is there no scanning capabilities available for T610/ T616/T618 when 'auto detect' function is used?

20. In VSQI, how is the MOS value estimated?

21. Unable to export to Google Earth in Tems Investigation Route Analysis ver 7.1 when using Microsoft Windows XP and Windows 2000.

22. Whenever a USB GPS is connected to my laptop, the mouse pointer is moving all over the place. How can I fix this?

23. Does TEMS Investigation support dual core processors? If not is, is there a workaround?

Answers

1. You say that the carrier to interference value in TEMS Investigation actually reflects carrier to noise. Can you specify how much of the Signal to noise ratio is attributable

to the Interference in the air?

No, we can't. In case of very low signal strength, C/I rather reflects the signal to noice ratio (C/N) but we have no method for differ C/I from C/N. In fact, you could see the C/I

as a measure of C/(I+N+R+A...). I.e. the relationship between the carrier and the sum of all interfering signals. Of course, in most GSM networks, the main part of the

interference comes from other base stations (and in the coverage limited case when the signal strength is low, noise).

2. Is there a definite link between C/I and S/N, or do we just have to presume that most of the S/N is caused by C/I?

See answer on question 1.

3. Can you scan (only) the BCCH frequencies, as in, can you get the screen to display the C/I or C/N value for a predefined number of frequencies (1...n).

It is possible to measure C/I in both idle and dedicated mode. In idle mode, you will get a C/I value on the BCCH carrier in the serving cell. You will not get a value on the

neighbours but you can of cause simply use the lock on channel function and switch serving cell.In dedicated mode, you will get a C/I value for each frequency in the

hopping list (even on the BCCH carrier (if included). If you have a non frequency hopping cell, you will get a C/I value on the used frequency. It is possible to present theC /me values in four different ways. The methods works even in a non frequency hopping cell (but of course, they will all be very similar).

Method 1. C/I Worst, presents the lowest C/I value (and the corresponing ARFCN value) of the frequencies in the hopping list. It is possible to choose index, i.e the worst,

the second worst, the third worst etc. It is possible to specify several indexes and monitor them simultaneously.

Method 2. C/I Best, presents the highest C/I value (and the corresponing ARFCN value) of the frequencies in the hopping list. It is possible to choose index, i.e the highest,

the second highest, the third highest etc. It is possible to specify several indexes and monitor them simultaneously.

Method 3. C/I Absolute, presents the C/I value on a specifed ARFCN. If the ARFCN is included in the hopping list the value is presented. If the ARFCN is not included in the

hopping list, nothing is displayed. When the frequency appears in the hopping list (e.g. after an handover to another cell) the C/I value is presented. It is possible to specify

several ARFCNs and monitor them simultaneously
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Method 4. C/I Hopping list, presents the C/I value on a chosen index in the hopping list. I.e it is possible to monitor the C/I (and the corresponding ARFCN) on e.g. position

1 in the hopping list. It is possible to specify several indexes and monitor them simultaneously.

4. I'm using a SlimCase/DriveTest case or a s tandalone NMEA GPS and the mouse pointer is moving all over the place when I'm drive testing. How can I fix this?

This is a known Microsoft problem. Just open up the Device Manager in windows and disable (not uninstall) the Microsoft ball pointing device.

5. I have a piece of TEMS Investigation equipment which seems to be broken. How do I get it repaired?

Please contact our First Line Support staff in your region with as much information as possible: model, serial number/IMEI, type of problem, date of purchase, PO number

etc. The contact information can be found here.

They will reply to you and assign an RMA number for you to use when returning the equipment. Also, they will check if the equipment is covered by warranty or not. Do NOT

send equipment to us without an RMA number, as this will only slow down the process.

6. What parameters of the radiolink will have impact on SQI?

The SQI algorithm is based on the bit error rate (BER), the frame erasure rate (FER), the distribution of the FER and BER (e.g. the number of consecutive erased frames),

handover events and so called s tolen frames (i.e. speech frames that have been replaced by signalling). Also the currently used speech coder effects the SQI.

The SQI algorithm takes into account all of those parameters and use the built in training to transform this into a speech quality degradation.

7. What speech coder versions do the SQI supports?

SQI is available for GSM FR (full rate), GSM EFR (enhanced full rate), GSM HR (half rate), AMR (adaptive multi rate), AMT FR, AMR HR.

8. Does the SQI show the quality on the uplink channel?

In the TEMS Investigation products, the SQI shows the quality on the downlink channel. However, in the Ericsson BSS R8 release or later , SQI on the uplink channel is

available as an option.

9. If I send speech to the TEMS Investigation mobile, how will this influence the SQI? Will the language, loudness or speaker(male/female) have impact on the SQI?

The SQI is calculated from the radiolink parameters. The impact of these parameters on the perceived speech quality has been built in to the SQI algorithm using a large

training material with different speakers and sentences.Therefore, the SQI is not dependent on rating a single sentence that is sent on the traffic channel, but will always

produce a reliable quality value.

10. How often is the SQI updated in TEMS Investigation?

TEMS Investigation is updating the SQI every 480 millisecond (i.e once every SACCH multiframe).

11. How is the SQI related to a typical sentence of a few seconds?

Every SQI value is a rolling average, giving an indication of the speech quality for a sentence during the past 2.4 seconds. Being updated every 480 millisecond the SQI

gives an instant quality value. If the user wants only one value for a longer time interval, a number of SQI values can be averaged for a time period up to about 20 seconds.

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12. We use Frequency Hopping, how will this affect the SQI?

Frequency hopping will improve the radio conditions, thus decreasing the bit error rate and the frame erasure rate. This is built into the SQI algorithm.

13. We use DTX Discontinuous Transmission), how will this affect the SQI?

SQI is calculated on all blocks actually transmitted on the downlink. If DTX downlink is used, only the valid blocks are taken into account. Note that not only the mandatory

SID block and the SACCH block are used, instead an algorithm similar to the one used in the speech decoder are user which calculated which blocks that are transmitted to

the mobile. However, in order to get a SQI with as high accuracy as possible, we recommend you to make sure that as many blocks as possible are transmitted.

14. How is the SQI scale constructed and what are the possible values for SQI?

A reference scale (dBQ) is constructed by combining simulated references (sentences with distortion typical for a mobile system) and MNRU (Modulated Noise Reference

Unit, ITU-standard P.810). Both male and female speakers are used. When the SQI algorithm is updated, we can make comparative listening tests towards the absolute

reference scale. The test will have a small variance. The SQI range comes from using this method.

15. What SQI values are indicating bad, good or very very good speech quality?

Speech samples with different SQI levels is available from TEMS Investigation Support (CD or www-download) so that it is possible to define suitable ranges for SQI e.g. 1-

5 or bad - good - very good. TEMS Investigation uses the following three color ranges as default:

-20

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18. I'm trying to copy my export setup (i.e. *.mex, *.aex, *.pex) files to another computer, but my Name and No Data columns are blank

Copy also the Columns.dbf and Columns4all.dbf files from the Application directory onto the destination computer.

AMR fullrate Codec SQI max

12.2 30

10.2 28

7.95 287.4 27

6.7 27

5.9 24

5.15 21

4.75 19

AMR halfrate Codec SQI max

7.95 28

7.4 27

6.7 27

5.9 24

5.15 21

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19. Why is there no scanning capabilities available for T610/ T616/T618 when 'auto detect' function is used?

The auto detect function detects the Sony Ericsson W600i and K600i phones but not T610/ T616/ T618.

The workaround is to manually connect the ports by using add equipment icon.

20. In VSQI, how is the MOS value estimated?

VSQI estimates how test persons would rate a video in a subjective test, and the rating scale is a five grade scale ranging from "Bad" to "Excellent".

Excellent corresponds to MOS 5 and Bad to MOS 1. We have tested the clean clips and they have got a MOS score, which is less than 5. You never get MOS 5 in a test

(and in VSQI) because there is always some of the test persons rating the video with a lower score than Excellent, and MOS is the average score of all test persons.

This is how a video clip (for example a clean clip) is scored depends on the subjective test. Two subjective tests can give the same clip a different score. However, this is a

property of the MOS scoring with the type of test we have done and the same situation goes for speech testing with a MOS score.

It is recommended to read the technical papers called 'Video Streaming Quality Measurement with VSQI.pdf' document provided in the TEMS Investigation CD package.

21. Unable to export to Google Earth in Tems Investigation Route Analysis ver 7.1 when using Microsoft Windows XP and Windows 2000.

This is fixed in Tems Investigation 7.1.1 patch.

22. Whenever a USB GPS is connected to my laptop, the mouse pointer is moving all over the place. How can I fix this?

There are 2 methods to solve this problem.

Method 1:

This is a known Microsoft problem. Just open up the Device Manager in windows and disable (not uninstall) the Microsoft ball pointing device.

Method 2:

Here is another workwaround for those who just can't disable it quite quickly enough from device manager and you need to have Admin rights to the PC. If you don't have

the rights you would need to visit your Administrator.

1 - Start Run, Regedit

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3 - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sermouse

4 - Change the "Start" value to 4 (Value is previously set as "3").

This disables the "sermouse" service from Windows.

Windows will still identify the GPS as a Mouse, but this mouse shows up with the yellow "!" in Windows device manager. The cursor will now behave and the PC as well as

Investigation seems to work Ok in this condition.

You can then optionally go to device manager right-click on it and disable as done before, then go back and revert the registry key back to 3. This will get you the customary

red X in device manager.

Remember if you connect the GPS on another USB port, the problem comes right back (leaving it as 4 works for all ports). However this may disable finding another real

mouse device later on.

23. Does TEMS Investigation support dual core processors? If not is, is there a workaround?

You may experience performances issues when using a dual core processor when running TEMS Investigation 6.1 onwards.

There is a Microsoft patch available at TEMS Customer Support.

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