How Do I Make a Dynamic Power Analysis Measurement?

How Do I Make a Dynamic Power Analysis Measurement?

Last updated: January 15, 2009

The dynamic power analysis measurement is a flexible tool that allows you to measure the output power of your UE versus time. This section provides examples for two main uses of the measurement, UE power calibration and HS-DPCCH power versus time measurement.

   
NOTE
Before performing a dynamic power analysis measurement, ensure that the measurement has been properly calibrated (see Calibrating the Test Set ).
   

UE Power Calibration

This procedure assumes that the test set is in Active Cell Operating Mode . However, this measurement is also available in FDD Test Operating Mode and CW Operating Mode .

  1. Set the test set's receiver to the proper power and frequency for your UE's power sequence:
    • Select Receiver Control ( F12 on Call Parms 3 of 3 ).
    • Set Power Control to Manual .
    • Set Manual Power to the initial transmit power of the UE's power sequence ( 0 dBm in the example pictured below).
    • Set Measurement Frequency to the frequency at which the UE will transmit its power sequence.
  2. Press the Measurement selection key.
  3. Select the Dynamic Power Analysis measurement.
  4. Select Dynamic Power Setup ( F1 ) and set the measurement parameters as needed. For example, to analyze the power sequence shown below, set the parameters as follows:
    • Set Steps to 23 .
    • Set Step Length to 666.7 us .
    • Set RF Rise Trigger Threshold to -10 dBm .
    • Set Trigger Qualification State to On .
    • Set Trigger Qualification Type to RF Rise and Fall .
    • Set Trigger Qualification Rise Threshold to 10 dB .
    • Set Trigger Qualification Fall Threshold to 10 dB .
    • Set Trigger Arm to Single .
    • Set Trigger Source to RF Rise .
  5. Select Close Menu ( F6 ).
  6. Place your UE into a test mode which will force it to continuously transmit the power sequence you desire to test. (To ensure that the measurement executes as quickly as possible, the UE should transmit its power sequence continuously until the measurement completes. This ensures that as soon as the measurement is done auto-ranging, another power sequence is immediately available for measurement. See Auto-ranging in the Dynamic Power Analysis Measurement for UE Power Calibration .)
  7. If Trigger Arm is set to Single , you must press the START SINGLE key to begin the measurement.
  8. Select Axis Control ( F2 ). Set the axis control parameters as needed. Select Return ( F6 ).
  9. Select Marker ( F3 ) to turn on the marker on the graphical display.

A typical result is shown below:

Measuring 3GPP TS 34.121 v7.5.0 s5.7A HS-DPCCH

This section is only applicable to the lab application or a test application with the required feature license.

Overview:

3GPP TS 34.121 s5.7A defines a specific UE output power waveform:

It then specifies the required relative power changes for the test points numbered above. The test is performed with the UE's DPCCH+DPDCH power equal to 0 dBm and also at maximum output power (the resulting power pattern and test points are altered somewhat at maximum power, but the ACK/CQI sequence is unchanged).

Procedure:

  1. Set parameters that can only be set in cell off operating mode (and other parameters that are set from the same menu):
    • Set Operating Mode ( F1 ) to Cell Off .
    • Select 34.121 Preset Call Configurations ( F11 on Call Parms 1 of 3 ) and select 5.2C, 5.7A, 5.13.1A, 5.13.1AA, 5.13.2A with QPSK . You may then skip any steps marked with [34.121 Call Config] in this procedure.
    • Select Channel (UARFCN) Parms ( F12 on Call Parms 1 of 3 ). Set DL Channel ( F7 ) and Uplink Channel ( F8 ) to the appropriate "mid range" frequencies for your UE's operating band, as specified by 3GPP TS 34.108 5.1.1 (for example, for operating band II, set DL Channel = 9800 ).
    • [34.121 Call Config] Select Uplink Parameters ( F4 on Call Control 2 of 5 ).
      • [34.121 Call Config] Set Uplink DPCH Bc/Bd Control to Manual .
      • [34.121 Call Config] Set Manual Uplink DPCH Bc to 15 (for 34.121 v7.5.0 Table C.10.1.4 sub-test 3).
      • [34.121 Call Config] Set Manual Uplink DPCH Bd to 8 (for 34.121 v7.5.0 Table C.10.1.4 sub-test 3).
      • [34.121 Call Config] Set Maximum Uplink Transmit Power Level to +21 dBm .
    • Set Operating Mode to Active Cell (pressing the CALL SETUP key quickly brings you back to the top level Call Control menu).
  2. [34.121 Call Config] Set Channel Type ( F8 ) to 12.2k RMC + HSDPA .
  3. Select HSDPA Parameters ( HSPA Parameters ( F10 ), F10 ).
    • Select HSDPA RB Test Mode Setup ( F8 ).
      • [34.121 Call Config] Set HS-DSCH Configuration Type to FRC (this is the default value).
      • [34.121 Call Config] Set FRC Type to H-Set 1 QPSK (this is the default value).
      • Set CN Domain as needed (by default it is set to PS Domain ). Note, before you can establish a connection in the PS domain, the UE must attach to the test set. To enable this, the PS Domain Information parameter (under Cell Parameters , F12 on Call Control 2 of 5 ) must be set to Present when the UE registers (attaches) with the test set.
    • [34.121 Call Config] Select HSDPA Uplink Parameters ( F11 ).
      • [34.121 Call Config] Set DeltaACK and DeltaNACK to 8 .
      • [34.121 Call Config] Set DeltaCQI to 7 .
      • [34.121 Call Config] Set Ack-Nack Repetition Factor to 1 (this is the default value).
      • [34.121 Call Config] Set CQI Feedback Cycle (k) to 4 ms .
      • [34.121 Call Config] Set CQI Repetition Factor to 1 (this is the default value).
  4. Test Application: Select Cell Parameters ( F2 ).
    Lab Application: Select Cell Info ( F2 ), then Cell Parameters ( F2 ).
    ( from the Call Control 2 of 5 menu)
    • [34.121 Call Config] Set Default DPCH Offset (DOFF) to 3 x 512 chips .
    • Set PS Domain Information to Present (this is the default value in the lab application) if you plan to establish the HSDPA connection in the PS domain (i.e. if you've set CN Domain to PS Domain or CS/PS Domain in step 3 above).
    • Qqualmin and Qrxlevmin are fixed to -24 dB and -115 dBm, respectively, in the test application. In the lab application these are the default values for these parameters. They are accessible from Cell Info , Reselection Parameters ( F3 ).
  5. [34.121 Call Config] Select Generator Info ( F3 on Call Control 2 of 5 ), select Connected DL Channel Levels ( F4 ), then select HSDPA Conn DL Channel Levels ( F4 ).
    • [34.121 Call Config] Set Cell 1 Connected HSDPA CPICH Level to -10 dB (this is the default value).
    • [34.121 Call Config] Set Cell 1 Connected HSDPA P-CCPCH/SCH Level to -12 dB (this is the default value).
    • [34.121 Call Config] Set Cell 1 Connected HSDPA PICH Level to -15 dB (this is the default value).
    • [34.121 Call Config] Set Cell 1 Connected HSDPA DPCH Level to -9 dB .
    • [34.121 Call Config] Set Cell 1 Sum of Active Conn HS-PDSCH Levels to -3 dB (this is the default value).
    • [34.121 Call Config] Set Cell 1 Connected HS-SCCH 1 Level to -8 dB .
  6. [34.121 Call Config] Select RB Test Mode Setup ( F6 on Call Control 3 of 5 ) and set UE Loopback Type to Type 1 (this is the default value).
  7. Set any other parameters needed to establish a connection with your UE, then power on the UE and wait for it to register (attach). See Establishing an HSDPA Connection .
  8. Select Originate Call ( F3 on Call Control 1 of 5 ).
  9. Set Cell Power ( F7 on Call Parms 1 of 3 ) to -86 dBm/3.84 MHz .
  10. Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ).
    • Set UL CL Power Ctrl Mode to Active bits (this is the default value).
    • [34.121 Call Config] Set UL CL Power Ctrl Algorithm to Two (this is the default value).
  11. To perform the test such that the DPCCH+DPDCH power is equal to 0 dBm, set UE Target Power ( F7 on Call Parms 3 of 3 ) to 0 dBm . The test set drives the UE's power to the specified value, while also appropriately ranging the test set's measurement receiver.
  12. Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ). Set UL CL Power Ctrl Mode to Alternating bits .
  13. Press the Measurement selection key.
  14. Select Dynamic Power Analysis .
  15. Set up the measurement:
    • Select Dynamic Power Setup ( F1 ).
    • Select 34.121 5.7A Measurement Configuration , then select Yes . You may then skip any steps marked with [34.121 Meas Config] .
    • [34.121 Meas Config] Set Steps to 37 .
    • [34.121 Meas Config] Set Step Length to 333.3 us .
    • [34.121 Meas Config] Set Measurement Interval to 283.3 us (to exclude the transient periods).
    • [34.121 Meas Config] Set RRC Filter to Off (to measure "mean power").
    • [34.121 Meas Config] Set Trigger Arm to Single , if desired.
    • [34.121 Meas Config] Set Trigger Source to HS-DPCCH .
    • [34.121 Meas Config] Set Trigger Delay to -308.3 us. (To trigger the measurement on the half slot just prior to subframe 0, a trigger delay of -333.3 us is required. To exclude the transient period after the slot boundary, a trigger delay of -333.3 us + 25 us = -308.3 us is required.)
    • [34.121 Meas Config] Set HS-DPCCH Trigger Subframe Alignment to subframe 0 (this is the default value).
    • Select Close Menu ( F6 ).
  16. If you set Trigger Arm to Single , press the START SINGLE key to begin the measurement.

  17. Adjust the Axis Control ( F2 ) as needed and use the Marker ( F3 ) to measure the power changes for each of the specified steps.

  18. To perform the test at the UE's maximum output power:
    • Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ). Set UL CL Power Ctrl Mode to Active bits .
    • Set UE Target Power ( F7 on Call Parms 3 of 3 ) to a high value, such as 24 dBm . The test set drives the UE to the specified level (or simply continues to send all up bits if the UE does not reach that level), while also appropriately ranging the test set's measurement receiver.
    • Select UL CL Power Ctrl Parameters ( F8 ). Set UL CL Power Ctrl Mode to All Up bits .
    • Repeat steps 16 and 17.

Related Topics

Dynamic Power Analysis Measurement Description

Dynamic Power Analysis Troubleshooting

Programming the Dynamic Power Analysis Measurement