4.4 Sampling grid

37.5443GPPConformance testingRelease 16TSUniversal Terrestrial Radio Access (UTRA) and Evolved UTRA (E-UTRA)User Equipment (UE) Over The Air (OTA) performance

For the anechoic chamber based measurement procedures the measurement of TRP is basically based on the measurement of the spherical radiation pattern of the DUT. The power radiated by the DUT is sampled in far field in a group of points located on a spherical surface enclosing the DUT. Generally it can be said that since the radiating object has a limited size the gain pattern cannot change arbitrarily versus angle, and therefore only a limited number of samples are required to represent the gain pattern to a given accuracy. The samples of TRP are taken using a constant sample step of 15° both in theta () and phi () directions.

The measurement of TRS is based on the measurement of the spherical sensitivity pattern of the DUT. The sensitivity values of the DUT at a predefined BLER level are sampled in far field in a group of points located on a spherical surface enclosing the DUT. The samples of TRS are taken using a constant sample step of 30° both in theta () and phi () directions.

All the samples are taken with two orthogonal linear polarizations, – and -polarisations. It is also possible to measure some other polarisation components, if it is possible to recover – and -polarisations from the measured data by some technique.

Alternatively, different sampling patterns may be used if they are able to ensure same or greater accuracy and provided appropriate measurement uncertainty terms are applied. The TRP can be calculated by interpolating the values to points on the regular grid. If an alternative sampling pattern is used number of measurement points should be greater than in the regular sampling grid.

For the multi-probe anechoic chambers procedures the measurement of TRMS are taken using sample steps of 30° in phi (), i.e. with 12 different UE azimuth rotations. For more details, see Annex A.5.