38.1513GPPNRRelease 17TSUser Equipment (UE) Multiple Input Multiple Output (MIMO) Over-the-Air (OTA) performance requirements
This measurement checks the total power in the centre of the test zone. The power validation is measured with a spectrum analyser as shown in Figure C.3.6-1.
Figure C.3.6-1: Setup for power validation measurements
Spectrum analyser settings:
Table C.3.6-1: Spectrum analyser settings for power validation measurements
Downlink centre frequency
in Table C.3.1-2
Integrated Channel Span
Number of points
1. Place a vertical reference dipole in the centre of the test zone connected to a spectrum analyser (or power meter) via a cable.
2. Record the cable and reference dipole gains.
3. Load the target channel model into the channel emulator.
4. Start the NR FR1 signaling in the base station emulator with the required parameter identical to the measurements conditions.
5. Average the power received by the spectrum analyser for a sufficient amount of time to account for the fading channel – one full channel simulation might be unnecessary.
6. Repeat steps 1 to 4 with a magnetic loop for the horizontal polarization, or a horizontally polarized sleeve dipole measured in at least four orthogonal horizontal positions and summed to measure the H component.
7. Calculate the total power received at the test area as the sum of the power in the two polarizations.
Note: in step 6, if horizontally polarized sleeve dipole is used, the reference gain correction should be the average of the theta gain pattern cut of the dipole. Besides, more horizontal positions for averaging will improve the measurement accuracy but increase the total measurement time.
The power validation result is considered as systematic offset, which needs to be corrected on the UE final sensitivity value to further reduce measurement uncertainty.