GPRS Mobile Measurements

1. Press the CALL SETUP key.
2. Press the More key (bottom right) to obtain the Call Parms (3 of 3) screen.
3. Press the Multislot Config ( F7 ) key and select 2 down, 2 up .
4. Connect the mobile.

5. Turn the mobile on and wait for Attached in the Active Cell: field.
   Note: For mobiles that don't perform a GPRS attach automatically, set the mobile to data mode.

6. Press the Start Data Connection ( F3 ) key and watch for the Active Cell: field changing to Transferring .
7. Press the Measurement selection key.
8. Select the Power vs Time measurement.
9. Press the Power vs Time Setup ( F1 ) key.
10. Press the Measurement Setup ( F1 ) key.
11. Set the measurement parameters as needed for your measurement situation, including:
    Measurement Timeout = 10 s
12. Press the Burst1 Meas Offsets ( F2 ) key and set up your required time offset values for burst 1.

    Note

    For statistical analysis the test set allows you to set up to 12 time markers. These markers do not define the mask but allow you to obtain measurement results from specified points on the mask.

    Note

13. Press the Burst2 Meas Offsets ( F3 ) key and set up your required time offset values for burst 2.

    Note

    Offsets are referenced to bit zero in a normal burst. To obtain results from measurement points before bit 0, enter negative offset values.

    Note

14. Press the Close Menu ( F6 ) key.
    

    A typical summary results screen is shown above.

15. Press the Return ( F6 ) key.
16. Press the Change View ( F2 ) key.
17. Press the Burst 1 numeric Results ( F2 ) key to view the offset measurement results for burst 1.
    
    

    A typical numeric measurement results screen for offsets is shown above.

18. Press the Burst 2 numeric Results ( F3 ) key to view the offset measurement results for burst 2.
19. Press the Graph ( F4 ) key to access the full graph view of the two adjacent uplink bursts.

    The structure of the Power versus Time graph menus are slightly different depending on the number of uplink bursts in the multislot configuration. If you require details on how to navigate through the Power versus Time graph menus, see either:

    • Power versus Time Graph Menus (one uplink burst) , or
    • Power versus Time Graph Menus (two uplink bursts) .
      
    

    A typical full graph view of two adjacent uplink bursts is shown above.

    Two types of pass/fail results are provided:

    • An overall measurement pass/fail indicator is positioned in the bottom left corner of the display:
      • The text "Pass" is shown in a green-colored font if the measurement has passed the entire mask.
      • The text "Fail" is shown in a red-colored font if the measurement has failed any part of the mask.
    • Individual pass/fail indicators are provided for each section of the mask. On the display, text labels corresponding to the following sections change color to indicate a pass or fail (green indicates a pass; red indicates a fail):
      • Rise section of burst 1
      • Active (useful) section of Burst 1
      • Guard period between burst 1 and 2 (Note: this indicator is only available if you are measuring two uplinks)
      • Active (useful) portion of Burst 2 (Note: this is only available if you are measuring two uplinks)
      • Fall section

    Note

    When the Multi-Measurement Count parameter is set to a number greater than 1, it is possible for some, or all of the individual pass/fail indicators to show a pass while the overall pass/fail indicator shows a fail. This is because the individual pass/fail indicators relate to the last of the multi-measurements made, whereas the overall mask pass/fail indicator is an accumulative result from all the multi-measurements made.

    Note

    You can zoom in to individual sections of the graph by pressing the Guard Period ( F2 ), Burst 1 Views ( F3 ), or Burst 2 Views ( F4 ) keys. In addition, you can control a marker or change axis values by pressing the Graph Control ( F5 ) key.

    

    A typical graph view of the falling edge of burst 2 is shown above. You can access this view by pressing the Burst 2 Views ( F4 ) key then the Falling Edge ( F3 ) key.

    In this case, the marker is turned on and positioned on the falling edge. The marker can be turned on by pressing the Graph Control ( F5 ) key then the Marker Position ( F2 ) key. Set the required marker position using the knob or the numeric entry keys. The signal level at the marker and its position along the x-axis are shown at the top of the display above the graph.

Power versus Time Graph Menus (one uplink burst)

Power versus Time Graph Menus (two uplink bursts)

Measuring Phase and Frequency Error

1. Connect the mobile.

2. Turn the mobile on and wait for Attached in the Active Cell: field.
   Note: For mobiles that don't perform a GPRS attach automatically, set the mobile to data mode.

3. Press the Start Data Connection ( F3 ) key and watch for the Active Cell: field changing to Transferring .
4. Press the Measurement selection key.
5. Select the Phase & Frequency Error measurement.
6. Press the Phase & Freq. Setup ( F1 ) key.
7. Set the measurement parameters as needed for your measurement situation, including:
   Measurement Timeout = 10 s
   

   A typical phase and frequency error measurement result is shown above.

8. Press the Change View ( F2 ) key.
9. Press the Graph ( F2 ) key to access the peak phase error graph.
   

   A typical peak phase error graph is shown above.

   The marker can be turned on by pressing the Graph Control ( F5 ) key then the Marker Position ( F2 ) key. Set the required marker position using the knob or the numeric entry keys. In addition, the axis values can be changed by pressing the Axis Control ( F1 ) key. This allows you to zoom in or out to look at particular sections of the graph in more detail.

   

   A typical peak phase error graph is shown above. This graph is zoomed in to show bits ranging from 100.0 to 120.0 at a 1.0 degrees per division setting. The Y-axis reference point is changed to 5.0 degrees.

   In this case, the marker is turned on and positioned at bit 104. The phase error at the marker and its bit position are shown at the top of the display above the graph.

   If you require details on how to navigate through the phase and frequency error graph menus, see Phase and Frequency Error Graph Menus .

Phase and Frequency Error Graph Menus

Measuring Output RF Spectrum

1. Connect the mobile.

2. Turn the mobile on and wait for Attached in the Active Cell: field.
   Note: For mobiles that don't perform a GPRS attach automatically, set the mobile to data mode.

3. Press the Start Data Connection ( F3 ) key and watch for the Active Cell: field changing to Transferring .
4. Press the Measurement selection key.
5. Select the Output RF Spectrum measurement.
6. Press the ORFS Setup ( F1 ) key.
7. Press the Measurement Setup ( F1 ) key.
8. Set the measurement parameters as needed for your measurement, including:
   Measurement Timeout = 20 s.
9. Press the Modulation Frequencies ( F2 ) key and set up your required offset frequencies for ORFS due to modulation.
10. Press the Switching Frequencies ( F3 ) key and set up your required offset frequencies for ORFS due to switching.
11. Press the Close Menu ( F6 ) key.
12. Press the Return ( F6 ) key.
13. Press the Change View ( F2 ) key.
14. Press the Modulation Numeric 1 of 3 ( F1 ) key.
    

    The measurement results for the first eight positions in the ORFS due to modulation table are displayed. You can view the results for the remaining 14 positions by pressing the Modulation Numeric 2 of 3 ( F2 ) key or the Modulation Numeric 3 of 3 ( F3 ) key. Note that the results are in dB relative to the 30 kHz BW Power shown on the screen.

15. Press the Switching Numeric ( F4 ) key to display the measurement results for ORFS due to switching.
    

    A typical measurement results screen for ORFS due to switching is shown above.

16. Press the Graph ( F5 ) key then the Modulation ( F1 ) key to access the ORFS due to modulation bar graph.
    

    A typical ORFS due to modulation graph is shown above. On the display, the bar representing each offset is shown in yellow and the center frequency is indicated by a white vertical line. There are two limit lines displayed; the absolute limit line is green and the relative limit line is blue. The pass/fail result is relevant to the displayed measurement.

17. Press the Switching ( F2 ) key to access the ORFS due to switching bar graph.
    

    A typical ORFS due to switching graph is shown above. On the display, the bar representing each offset is shown in blue and the center frequency is indicated by a white vertical line.

    In this case, the marker is turned on and positioned at the 600 kHz offset. The signal level and frequency of the offset where the marker is positioned, are shown at the top of the display above the graph.

    The marker can be turned on by pressing the Graph Control ( F5 ) key then the Marker Position ( F2 ) key. Set the required marker position using the knob or the numeric entry keys. In addition, the axis values can be changed by pressing the Axis Control ( F1 ) key. This allows you to zoom in or out to look at particular sections of the graph in more detail.

18. Press the Modulation and Switching ( F3 ) key to access a screen displaying both graphs, as shown in the example below.
    

    Note that each of the graphs have their own graph controls on F4 and F5 .

    Any failing results are displayed in red.

    If you require details on how to navigate through the Output RF Spectrum graph menus, see Output RF Spectrum Graph Menus .

19. To set your own limits for each offset use the Measurement Setup menu and set Limit Source to Manual . You can then use Modulation Limits ( F4 ) and Switching Limits ( F5 ) to set your required limits for each offset.

Output RF Spectrum Graph Menus

1. Press the CALL SETUP key.
2. Press the More key (bottom right) to obtain the Call Parms (3 of 3) screen.
3. Press the Multislot Config ( F7 ) key and select 1 down, 1 up .
4. Press the Data Conn Type ( F4 ) key and select ETSI Type B .
5. Connect the mobile.

6. Turn the mobile on and wait for Attached in the Active Cell: field.

   Note

   For mobiles that don't perform GPRS attach automatically, set the mobile to data mode.

   Note

7. Press the Start Data Connection ( F3 ) key and watch for the Active Cell: field changing to Transferring .
8. Press the Measurement selection key.
9. Select the Bit Error measurement.
10. Press the Bit Error Setup ( F1 ) key.
11. Set the measurement parameters as needed for your measurement situation, including:
    Measurement Timeout = 13.0 s
    

    A typical bit error ratio measurement result is shown above.

    To see the effect of cell power on the bit error ratio, press the Cell Power ( F7 ) key on the Call Parms (1 of 3) screen and slowly reduce the power while observing the Bit Error display.

1. Press the CALL SETUP key.
2. Press the More key (bottom right) to obtain the Call Parms (3 of 3) screen.
3. Connect the mobile.

4. Turn the mobile on and wait for Attached in the Active Cell: field.

   Note

   For mobiles that don't perform GPRS attach automatically, set the mobile to data mode.

   Note

5. Press the Start Data Connection ( F3 ) key and watch for the Active Cell: field changing to Transferring .
6. Press the Measurement selection key.
7. Select the Block Error measurement.
8. Press the Block Error Setup ( F1 ) key.
9. Set the measurement parameters as needed for your measurement situation, including:
   Measurement Timeout = 13.0 s
Number of blocks to test = 100
   

   A typical block error measurement result is shown above.

   To see the effect of cell power on the block error, press the Cell Power ( F7 ) key on the Call Parms (1 of 3) screen and slowly reduce the power while observing the Block Error Ratio display.

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