ducts Wide area Medium range Local area Home base station MCL > 70 dB MCL > 53 dB MCL > 45 dB Max 0.10 W Even beyond 100 Max 6 W Max 0.25 W W per carrier 'Macro' 'Micro' 'Pico' 'Femto' Figure 6.2 3GPP base station categories and 50 litres, while the size of a micro base station can be below 5 kg and 5 litres. It is easier to find a good location for the small cell installation if the product form factor is very small. The base station product should be weather proof to allow outdoor installation without any additional casing. An integrated antenna is simple from the deployment point of view. On the other hand, an antenna connector allows for using external antennas, which gives more flexibility especially for the outdoor installations. The output power needs to be sufficiently high especially in the outdoor installations to provide indoor coverage and dominance area in the presence of a co-channel macro cell. Several watts or even 10 W of power may be needed for the outdoor installations. The power level should also be adjustable SO that lower power can be used to limit the interference and the coverage areas. The base station should preferably support an adjustable setting for the transmit power that the base station cannot exceed, in order to eliminate health risks caused by radio frequency emissions in places where users could get close to the base station. 2 X 2 MIMO support is needed since long-term evolution (LTE) devices also support 2 X 2. Power consumption should preferably be low to keep the base station size, the electricity bill and the running costs low. Small cells need to support a large number of simultaneous users to make it possible to use small cells for high-capacity hot spots, like sports stadiums or other mass events. Feature parity between small cell and macro cell is preferred. Feature parity means that the same features are supported by the small cells as by the macro cells. Feature parity helps in providing the same end user experience also in the small cells. Feature parity also helps i