O.2.4 Size of the quiet zone

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

The size of the quiet zone within which the variations of measurements are evaluated depends on the size of the DUT. For smartphones, the quiet zone shall be considered a sphere with radius of R=10cm. For larger smartphones and tablet type devices, the quiet zone shall be considered a sphere with radius of R=15cm. For even larger device, e.g., larger tablets and laptops, quiet zones of radius R=20cm and R=27.5cm shall be considered. Alternate quiet zone sizes can be defined for even larger DUTs.

The quality of quiet zone procedure for systems supporting multiple quiet zone sizes can be performed for the largest quiet zone radius only and the results can be applied to the smaller quiet zone radii if the same chamber components affecting QoQZ, i.e., reflector, feed probes, etc, are used. Performing separate sets of quality of quiet zone measurements for different radii is not precluded.