F.9 Full sphere with sparse sampling

37.145-23GPPActive Antenna System (AAS) Base Station (BS) conformance testingPart 2: radiated conformance testingRelease 17TS

The procedure is as follows:

1. Set the angular grid:

a. Non-harmonic frequencies: choose the angular steps and smaller than or equal to 15 degrees. Calculate the sparsity factor (SF) as

and the correction factor as:

where corresponds to 15 degrees angular step. If the sparsity factor is smaller than 1, the correction factor ΔTRP is 0 dB.

b. Harmonic frequencies with fixed beam test signal: choose the angular steps smaller than or equal to the reference angular steps and . Correction factor ΔTRP is 0 dB.

c. Harmonic frequencies with beam sweeping test signal: set the angular steps to 15 degrees. Correction factor is ΔTRP 0 dB.

2. Apply a suitable numerical integration to calculate the TRP estimate.

3. Add the appropriate correction factor ΔTRP according to step 1 to ensure an overestimation with 95% confidence.

4. Compare the (TRP estimate + ΔTRP) with the limit. If the (TRP estimate + ΔTRP) is above the limit, choose a smaller angular step and repeat steps 2-4. If the sparsity factor is less than one, no significant improvement of accuracy is expected.