Method for controlling the activity of a base station entity of a first type in a mobile communication network by means of a mobile device having a communication link to a base station entity of a second type, the base station entity of the second type corresponding to a first Radio Access Technology, RAT, and the base station entity of the first type corresponding to a second Radio Access Technology, RAT, wherein the base station entity of the first type is operable in at least a first and a second operational mode, wherein the first operational mode corresponds to the base station entity of the first type transmitting radio frequency signals such that a control channel corresponding to the second RAT is received in a radio coverage area of the base station entity of the first type by the mobile device, wherein the second operational mode corresponds to the base station entity of the first type not providing the control channel corresponding to the second RAT in the radio coverage area of the base station entity of the first type for the mobile device, wherein the method comprises the following steps: -- in a first step, the mobile device sends a connection request to the base station entity of the second type, the connection request being related to a request of the mobile device to have a communication link with the base station entity of the first type while the base station entity of the first type is in its second operational mode, -- in a second step, the first operational mode of the base station entity of the first type is activated and the communication link between the mobile device and the base station entity of the first type is established, wherein a plurality of base station entities of the first type correspond to a further radio coverage area of the base station entity of the second type, wherein the choice which base station entity of the first type is to be activated in the second step is dependent on at least one out of the following: -- a detected position of the mobile device within the further radio coverage area of the base station entity of the second type, -- a detected speed and/or direction of motion of the mobile device within the further radio coverage area of the base station entity of the second type, -- the geographical or infrastructural situation within the further radio coverage area of the base station entity of the second type, -- the mobile device, wherein by means of a further reactivation request, sent from the base station entity of the second type to the base station entity of the first type, the base station entity of the first type is activated or reactivated, wherein the connection request comprises the indication of a first service requested by the mobile device or the indication of a second service requested by the mobile device, wherein the base station entity of the first type or a base station entity of a third type corresponding to a radio access technology other than the second and first RAT, is activated in a manner dependent on whether -- the first service or -- the second service is requested by the mobile device. -- in a first step, the mobile device sends a connection request to the base station entity of the second type, the connection request being related to a request of the mobile device to have a communication link with the base station entity of the first type while the base station entity of the first type is in its second operational mode, -- in a second step, the first operational mode of the base station entity of the first type is activated and the communication link between the mobile device and the base station entity of the first type is established, -- a detected position of the mobile device within the further radio coverage area of the base station entity of the second type, -- a detected speed and/or direction of motion of the mobile device within the further radio coverage area of the base station entity of the second type, -- the geographical or infrastructural situation within the further radio coverage area of the base station entity of the second type, -- the mobile device, -- the first service or -- the second service