Method for operating and/or for configuring a repeater device for enabling the repeater device to be operated together with a user equipment as part of a telecommunications network, the user equipment being able to be connected to the telecommunications network, and the telecommunications network comprising an access network, the access network comprising a plurality of base station entities (111, 112), the base station entities (111, 112) transmitting radio frequency signals in a coverage area, respectively, wherein the repeater device is configured, by means of a transceiver entity or functionality, such as to receive, as well as to transmit or to retransmit, at least a part of the radio frequency signals transmitted by a specific base station entity of the plurality of base station entities (111, 112), wherein the radio frequency signals transmitted by the specific base station entity comprise a broadcast control channel used to transmit control and/or configuration information to be received by the user equipment when connected to the specific base station entity, wherein the repeater device is configured such as to receive, and to process, at least a part of the control and/or configuration information transmitted by the specific base station entity using the broadcast control channel, wherein, as part of the control and/or configuration information of the broadcast control channel, a network identifier information of the telecommunications network is transmitted, wherein the network identifier information of the telecommunications network corresponds to or comprises the cell global identifier, CGI, of the specific base station entity, wherein, in order to operate and/or to configure the repeater device, the method comprises the following steps: -- in a first step, the repeater device is provided with or receives a piece of network identifier information, -- in a second step, the repeater device receives, as part of the broadcast control channel transmitted by the specific base station entity, at least the network identifier information of the telecommunications network, determines whether this network identifier information corresponds to the piece of network identifier information, and, in the affirmative case, receives and processes at least a repeater-specific configuration information being a part of the control and/or configuration information of the broadcast control channel, wherein the repeater-specific configuration information comprises at least one piece of configuration information comprising one or a plurality out of the following: -- an indication not to retransmit certain signals and/or not to retransmit on certain frequencies or in certain frequency bands, -- an indication regarding filter adjustments to retransmit exclusively on one or a plurality of frequencies or frequency bands, -- an indication regarding amplifier adjustments to retransmit using a specific transmission power or a specific transmission power level, wherein the indication to retransmit using a specific transmission power or a specific transmission power level indicates to retransmit at most using this specific transmission power or transmission power level. -- in a first step, the repeater device is provided with or receives a piece of network identifier information, -- in a second step, the repeater device receives, as part of the broadcast control channel transmitted by the specific base station entity, at least the network identifier information of the telecommunications network, determines whether this network identifier information corresponds to the piece of network identifier information, and, in the affirmative case, -- an indication not to retransmit certain signals and/or not to retransmit on certain frequencies or in certain frequency bands, -- an indication regarding filter adjustments to retransmit exclusively on one or a plurality of frequencies or frequency bands, -- an indication regarding amplifier adjustments to retransmit using a specific transmission power or a specific transmission power level, wherein the indication to retransmit using a specific transmission power or a specific transmission power level indicates to retransmit at most using this specific transmission power or transmission power level.