. The categories are defined with the maximum output power and the minimum coupling loss (MCL). MCL refers to the minimum path loss between the base station antenna and user equipment (UE) antenna. MCL indicates the type of base station installation. High MCL requires that UE cannot get too close to the base station antenna which is typical for the high-mounted macro cell antennas. Low MCL means that UE can get very close to the base station antenna. The categories are defined SO that some RF specifications can be relaxed for the low-power base stations to enable lower cost implementation. Sensitivity requirements are relaxed because the link budget is anyway limited by the low power in downlink. Higher spurious emissions are allowed for the low-power products because there are no co-sited base stations with high sensitivity requirements. Some of the blocking requirements are higher for the low-power base stations because interfering UEs can get closer to the base stations. Frequency stability requirements are relaxed for the lower power base stations because there are no high vehicular speeds used in those cells. The four categories are shown in Figure 6.2. The wide area category applies to all high- power base stations with more than 6 W of output power. The wide area category can also be called as macro base station. The required MCL is 70 dB. The medium range base station, or micro base station, can have up to 6 W of power. The local area base station is limited to 0.25 W and the home base station to 0.10 W power. 6.3 Micro Base Stations Micro cell and pico cell products are targeted for installations in public areas. The installation is done by the operator and the small cell needs to work smoothly together with the macro cell. We consider some of the important characteristics of the small cell products below: The size and the weight of the base station should preferably be small to make the practical installation simple. The size of the complete macro base station is typically more than 50 kg Small Cell Pro