O.3.6.2 Combined-axes system

38.521-23GPPNRPart 2: Range 2 StandaloneRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification

The reference measurements for the reference AUT placed at the 7 antenna positions shall be rotated around the x axis with 2 different angles , i.e.,  = 0^o and 180^o and fixed  = 0^o. A graphical illustration of the sample reference AUT orientations is shown in Figure O.3.6.2-1 with a reference AUT placed at position 4, P4, for reference antenna polarization _pol = 0^o; Figure O.3.6.2-2 illustrates the reference AUT orientations for the reference polarization _pol = 90^o.

The matrix operation for the rotations and translation is defined as

for the combined-axes system. The matrices are defined in Annex J.2 of TS 38.101-2.

Figure O.3.6.2-1: Reference AUT orientations for position 4, P4, for reference antenna
polarization _pol = 0^o.

Figure O.3.6.2-2: Reference AUT orientations for position 4, P4, for reference antenna
polarization _pol = 90^o

If the device re-positioning approach is adopted for the spurious emissions test cases, i.e., two hemispheres are measured separately which involves the DUT, while connected to the gNB emulator, to be rotated by 180^o around its axis halfway through the test, the quality of quiet zone analysis is sufficient only for  = 0^o_.

The positioner relative coordinates/orientations with respect to the measurement antenna/reflector shall remain the same for each reference antenna orientation, e.g., in the sample combined-axes system shown in O.2.5.2-2 the reference antenna shall be pointed at the positioner for b = 180^o for the initial position of (q,f) of (0,0).