Cross-carrier In-band Emissions (LTE-Advanced)

Menu Path (uplink): Trace > Data > Cross CC > In-band Emissions

The Cross-carrier In-band Emissions trace displays the results of a spurious emissions limit test performed across the bandwidth of a secondary (unallocated) component carrier (CC) bandwidth when the primary (allocated) CC is transmitting. The resource block power spectrum for the data specified by Measurement Interval and Measurement Offset. This is an uplink-only feature.

This trace is similar to the single-carrier In-band Emissions trace, but it displays the in-band emissions across two CCs.

See Section 6.5.2.3 of 3GPP TS Technical Specification 36.521-1 for more information about in-band emissions measurements.

The Cross-carrier In-band Emissions limit test is performed when one CC is allocated and the other CC is unallocated, as shown in the following illustration.

The Markers readout shows the result of the Cross-carrier In-band Emissions limit test as either Pass or Fail. The marker readout also shows the location of the resource block that has passed with the tightest margin or failed with the widest margin.

You can recall the LTEA-FDD Frequency Division Duplex: A duplex scheme in which uplink and downlink transmissions use different frequencies but are typically simultaneous.-UL Up Link (reverse link: from cell phone to base station)-3M5M demo signal (File > Recall > Recall Demo... > LTE-A > LTEA-FDD-UL-3M5M.htm) and open a Cross-carrier In-band Emissions trace to see an example. However, in this example, the limit test will fail because the recorded signal has two active CCs and the power level of the CC you unallocate in the Common tab's List of Component Carriers will exceed the limits of the test.

Although the limits for this trace are auto-generated, the limits can be customized by performing the following steps:

1. Select the Cross-carrier In-band Emissions trace by clicking the trace title.

2. Click Utilities > Limit Tests > From Trace

   This will open the Limit Test Editor dialog with limits extracted from the In-band Emissions trace.

3. Modify the limit test

   1. Select the Upper limit and click Edit.

   2. Click the Points tab and modify the limit line points.

   3. Type a name for the limit line in the Name field and click OK to save the limit line.

   4. Type a name for the limit test in the Name field and click OK to save the limit test.

4. Apply the modified limit test

   1. Click Markers > Limits…
   2. Select the modified limit test.

The selected limit test will continue to be applied in all subsequent measurement sweeps.

To revert to auto-generated limit lines, select the Cross-carrier In-band Emissions trace, click Markers > Limits…, and select <Limit Test from Trace>.

For more information about limit lines, see the About Limit Lines topic.

 

 

See Also

Available Trace Data

RB Power Spectrum