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.