 an uncontrolled manner for cost reasons. Uncontrolled deployment means, for example, that, as the access point is installed by the customer, the exact position of a femtocell in a building or its coverage area relative to neighbouring macro or small cells is out of the control of the mobile network operator. This also means that only some basic network planning measures are applied. Therefore, femtocells, also known as femto access points, typically apply some relatively advanced SON features. Some important femto SON features are Automatic setup Downlink listen mode to identify the co-channel signal and the macro cells in the area Downlink power level setting based on the received signal level from the co-channel macro and small cells and based on the terminal reports Periodic monitoring of the surroundings during operation, to detect possible changes Since residential femtocells are designed to automatically connect to the operator's network once plugged to the public Internet, it is necessary to ensure that the geographical location of the femto access point does not change from the one originally agreed upon between the operator and the customer. This is called location locking. Various methods of location locking have been designed, such as GPS coordinates, surrounding RF map, country-specific IP addressing range, DSL line identity and MAC address of the ADSL router initially assigned to the femto access point. Another characteristic feature of femtocells is the possibility to restrict the mobile network service access to a closed subscriber group (CSG). A 3G femto access point is connected to the core network via a femto gateway, located in mobile operator's premises. A femto gateway can typically have thousands of femto access points under its control. The telecom protocol used to connect the 3G femto access point to the gateway is the 3GPP-standardized Iuh protocol. For an LTE femto access point the gateway is optional and it can connect to the evolved packet core (EPC) directly over a standard S1 interf