Measuring Time Response of Open Loop Power Control (TROLPC)

Measuring Time Response of Open Loop Power Control (TROLPC)

Last updated: November 10, 2006

General Procedure

   
NOTE
Channel power calibration should be performed if the test set is being used for the first time or the operating environment has changed significantly since the last calibration was performed. The channel power calibration also calibrates the TROLPC measurement. See Calibrating the Test Set for details.

   

  1. Connect the access terminal to the test set's front panel RF IN/OUT connector and power it on.
  2. Wait for the access terminal to open a session and then open an RTAP (for subtype 0 physical layer) or RETAP (for subtype 2 physical layer) data connection for AT's transmitter test. See How Do I Open a Session and Test Data Connection? for detailed procedure.
  3. Set the RTAP Rate ( F12 ) on the Call Parms 1 of 3 menu as needed if during an RTAP connection, or set the R-Data Pkt Size ( F12 ) on the Call Parms 1 of 3 menu as needed if during an RETAP connection.
  4. C.S0033 does not specify that the R-ACK Channel must be active for 4.3.2 Time Response of Open Loop Power Control. If the R-ACK Channel is active during this test, the access terminal's power may fall outside of the mask specifications. To help ensure that your access terminal does not fail this test, you should disable the R-ACK Channel by setting the following parameters from the Application Config ( F10 on the Call Parms 1 of 3 ):

  5. Initialize the TROLPC measurement:
    • Press the Measurement selection key.
    • Turn the knob to highlight the Time Response of Open Loop Power Control measurement and press the knob.

         
      NOTE
      If any measurements are open during initiation of a TROLPC, the test set will automatically close them and display an error message indicating the last measurement that was closed.

         

  6. Select Time Response of OLPC Setup ( F1 ) to access the Time Response of OLPC Setup menu. You can also configure AT directed packets and ACK channel bit fixed mode attribute from this menu.
  7. Select Close Menu ( F6 ) to close the Time Response of OLPC Setup window.
  8. From the Call Parms menu, configure Cell Power ( F7 ), as needed.
  9. Measure TROLPC:
    • Select Start Meas Up ( F2 ), which automatically increases Cell Power by 20 dB and captures the resulting access terminal output power for 100 ms, or
    • Select Start Meas Down ( F3 ) which automatically decreases Cell Power by 20 dB and captures the resulting access terminal output power for 100 ms.
    • You may also select START SINGLE to start the measurement. The cell power will increase by 20 dB if Start Meas Up was last performed (or if the test set is in a preset state), or decrease by 20 dB if Start Meas Down was last performed.
  10. After the measurement has completed, select Marker ( F4 ) and turn the knob to display power at points along the access terminal output power trace. If the test failed, next to the word "Fail," the first data point at which the test failed is displayed.

       
    NOTE
    As specified by C.S0033, the AT output power level curve is shown in absolute terms. The delta expressions above the display indicate the direction of power change.

       

An example of a "Fail" test result is shown below.

   
IMPORTANT
After completing TROLPC testing, you must return ACK Channel Bit Fixed Mode Attribute to on and set AT Directed Packets to a non-zero value appropriate for your test setup.

   

Testing 4.3.2 Time Response of Open Loop Power Control

For details on performing the steps below, see the General Procedure above.

  1. For Subtype 0 or 1 Physical Layer, set up a Test Application session and open an RTAP connection with the RTAP Rate set to 9.6 kbps . For detailed procedure on how to open an RTAP session and connection, see How Do I Open a Session and Test Data Connection? .

    For Subtype 2 Physical Layer, set up a Test Application session and open an RETAP connection with the following setups. For detailed procedure on how to open an RETAP session and connection, see How Do I Open a Session and Test Data Connection? .

    • Set the R-Data Pkt Size ( F12 on Call Parms 1 of 3 ) to 256 bits.
    • Set the Reverse Data Transmission Mode under the Application Config ( F10 on Call Parms 1 of 3 ) menu to High Capacity .
    • From the Power Parameters Info menu (see How Do I Change Channel Gain/Traffic Info Parameters? for how to access), set the 256-bit High Capacity Termination Target to 3 (4 sub-frames, 16 slots). (NOTE: You do not need to set these settings unless the default value (3) of these settings are changed. Changing these setting results in an open data connection closed because these settings are configured during session negotiation. Once this happen, you need to re-open the connection.)

  2. Configure the Test Application FTAP (for Subtype 0 or 1 Physical Layer) or FETAP (for Subtype 2 Physical Layer) so that the ACK Channel is not transmitted by the access terminal, by setting ACK Channel Bit Fixed Mode Attribute to Off and AT Directed Packets to 0% under the Application Config ( F10 on Call Parms 1 of 3 ) menu.
  3. Initialize the TROLPC measurement.
  4. Set Î or ( Cell Power ) to -60 dBm/1.23 MHz.
  5. C.S0033 specifies to send alternating `0' and `1' power control bits on the Forward Traffic Channel. When you start the TROLPC measurement, the test set automatically sends alternating closed loop power control bits during the test.
  6. Measure TROLPC:
    • Select Start Meas Up ( F2 ), (cell power transitions to -40 dBm/1.23 MHz), and note the pass/fail result.
    • Select Start Meas Down ( F3 ), (cell power transitions to -60 dBm/1.23 MHz), and note the pass/fail result.
    • Select Start Meas Down ( F3 ), (cell power transitions to -80 dBm/1.23 MHz), and note the pass/fail result.
    • Select Start Meas Up ( F2 ), (cell power transitions to -60 dBm/1.23 MHz), and note the pass/fail result.