s for NRA to oblige mobile operators to keep net- work logs. Otherwise, the NRA may consider service time availability as the percentage of successful measurements provided with drive tests or results obtained from QoS mea- surement probes. A similar approach can refer to other KPIs in mobile networks. However, certain KPIs in mobile networks are significantly different from the same KPIs in fixed broadband networks. Such KPIs are downlink and uplink speeds (i.e. bitrates). The bitrates in mobile networks cannot be guaranteed as in fixed (fiber) networks for the following main reasons [7]: Modulation and coding scheme (MCS) being used. Time varying and location depen- dent SNR directly influences the MCS that can be used for the given communication. There are different modulation schemes which provide different number of bits transferred per symbol (where the symbol rate on the radio link is dependent upon the frequency carrier width and multiple access technique based on TDMA). For example, 16 QAM (quadrature amplitude modulation) can transfer 4 bits/symbol (because 16 = 24), while 256 QAM can transfer 8 bits/symbol (because 256 = 28. That means with the same resources (e.g. the same frequency carrier and time slot on it), 256 QAM provides two times higher bitrate than 16 QAM (e.g. if 16 QAM provides 100 Mbit/s, then use of 256 QAM will provide 200 Mbit/s). However, MCS depends on the SNR ratio, and SNR ratio depends mainly on signal strength. Signal attenuates with distance (which happens on shorter distances in urban areas due to more obstacles on the path of radio waves), SO longer distance between the mobile device and the base station (3G, 4G, 5G or some future mobile generation) results in use of MCS with less bits per symbol, and vice versa. Therefore, ultra-broadband speeds (e.g. in urban areas) require small cells in the mobile network. MIMO (multiple input multiple output). The bitrates in the mobile networks depend proportionally on the number of antennas used on both ends in the radio link between th