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Performing LTE TS 36.141 Clause 7 Receiver Characteristic Tests

This topic guides the user through using the preconfigured LTE Clause 7 tests. Some tests use multiple signals: a wanted signal, an interferer, and some use an additional CW interferer. For most of the tests that require multiple signals, the software enables the use of either a single signal generator or multiple signal generators to create all of the needed signals. See the LTE FDD and LTE TDD Tests topic for more information.

Test Case Manager also provides the ability to export the waveform settings for use in the appropriate Signal Studio Software.

Range values such as frequency and amplitude are dependent upon the instrument identified in the Signal Generator (n:<connection status>) node. To find range values, refer to the instrument's User's Guide or Data Sheet.

Each software setting has a hint (setting information) associated with it. To use the hints, just click on the setting and the hint appears below the settings window.

Some fields within the setting windows are grayed out, while others are not and allow a different setting. The grayed out fields are static settings required by the standards and may change, in accordance with the standards, as active fields within the same window or the Common Settings window are changed.

While making changes, you can monitor the signal changes by viewing the graphic at the bottom of the test settings window. If there is a need to save all of the software settings, this can be done by using the Save As... function to create a state file.

  1. Select a test.

    The test shows whether one or multiple test signals are required. If multiple signals are required, the software can create a single waveform with all signals so it will play on one instrument, or create separate waveforms, one for each instrument based on the instrument selection for each signal. The benefit of using different instruments for each signal is greater dynamic range.

    1. If needed, expand Test Cases and any lower level collapsed nodes until the list of tests are displayed.

    2. Select the desired test and view its parameters noting whether it requires one or more signals.

      The 7.6 Blocking (Co-Located) test requires a separate signal generator for each signal.

      The other 7.6 blocking tests may also require a separate signal generator for each signal if the bandwidth for the wanted and interferer exceeds the instrument's limitations. The software shows a message when this condition exists.

      • If the test requires more signals than the number of signal generators showing in the Hardware Connections and Settings node of the tree window, the software allows the addition of more instruments. This step occurs later in the process.

      • If a PXB is available, it creates multiple waveforms. But it cannot be used to create a CW Interferer where the CW Interferer is not part of another signal’s waveform file. If the CW interferer requires the use of a standalone instrument, it must use a signal generator.

  2. Setup the instruments and make the connection to eNB.

  3. Configure the instrument(s).

  4. Click the desired Common Settings node (FDD or TDD) and configure the eNB parameters.

    The eNB Type selection determines the grayed out settings in the test selections (test settings window) in accordance to the 3GPP standards, provided that Override Setting in the test settings window is not enabled.

    The eNB Type selection of Home BS is not applicable to the test case 7.6 Blocking (Co-Located).

    If the Wanted and Interferer Cell ID are the same values, ensure that the Wanted and Interferer RNTI values differ between the two.

  5. Reselect the test selected in Step 1.

  6. Configure the non-grayed out (active) parameters:

    1. For a TS 36.141 compliant test signal, leave State enabled.

      If there is a need to disable State, refer to the State Checkbox Behavior topic for more information.

    2. For each signal, click the Signal Generator field and use the drop-down menu to select an instrument for the current signal.

      The drop-down selection menu contains all of the instruments configured in a previous step. When the same instrument is selected for all signals, the software combines all of the carriers into one waveform file for playback on the single instrument. When different instruments are selected for the various signals, each instrument plays only that signal for which it was selected. For more information, refer to the Waveform Files topic.

      For the PXB, to create a single waveform file for all signals, use the PXB (BBG1) selection. To create multiple waveform files, use the PXB (BBG1) selection for one or more signals and the PXB (BBG2) selection for the other one or two signals.

      The PXB (BBG2) selection cannot be used alone, it can only be used when another signal uses the PXB (BBG1) selection. The order in which they are used does not matter.

    3. Click Channel Bandwidth and set the bandwidth that is appropriate for the eNB under test and as specified by the test in the standards.

      Most grayed-out settings for all signals in the test are coupled to the Wanted Signal Channel Bandwidth selection. So a change to the Channel Bandwidth causes most other settings to change in accordance with the 3GPP standards.

    4. Set the remaining parameters as needed or required.

      For the 7.6 blocking tests, the settings include the Frequency (Absolute) property. The frequency entry field for this property includes Closedup/down arrows that when clicked, increments/decrements the frequency by 1 MHz..

  7. If there is a need to reconfigure the grayed out parameters, which causes the test to no longer be in compliance with the 3GPP standards, perform the following steps:

    1. Enable the Override Settings by checking the box.

      This causes the grayed-out parameters(inactive) to become active so they can be changed.

    2. Modify the settings as needed.

      After modifying the settings, if the Override Settings is disabled by unchecking the box, the software resets the grayed out parameters back to their default settings based on the current eNB Type selection in the Common Settings.

  8. Click the Execute button.

  9. If there is a need to stop the signals, click the Stop button.

    To restart the signals, click the Execute button, which again downloads all of the settings. If the PXB is the fading simulator:

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