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Analysis of EIRP Measurement Grid for 5G Millimeter Wave User Equipment

For 5G millimeter wave (mm-Wave) telecommunications, the combination of highly integrated phased array antenna modules and system-level dynamic beamforming makes the antenna port inaccessible for physical connections to test equipment. Therefore, radiated over-the-air (OTA) testing becomes mandatory for 5G mm-Wave devices’ validation and performance evaluation. New test cases as well as associated Figure of merits (FoMs) are required. In 3rd generation partnership project (3GPP), the equivalent isotropic radiated power (EIRP) is used as a basic FoM for defining the radiation performance and the uplink spherical coverage of UE is evaluated by cumulative distribution function (CDF) of EIRP. Given the complexity of OTA test system, the test time for 5 G mm-Wave devices have been dramatically increased compare with sub-6 GHz test cases. Therefore, proper approaches to reduce the mm-Wave test time significantly is a key issue to be resolved and measurement grid is an important breakthrough direction. This paper aims to present an in-depth understanding of the impact of different measurement girds on 5G mm-Wave test time and accuracy through experiments. We first briefly review the progress of 3GPP standardization on measurement grid for 5G mm-Wave mobile devices. Then, several experiments are carried out with different angular step size to get different CDF results, their test time and measurement accuracy are also compared and analyzed. The results illustrate the importance of optimized angular step size and a proper choice of measurement grid size. The challenges of balancing test time and measurement accuracy for 5G mm-Wave devices during OTA RF performance evaluation have been elucidated and further discussed.