A method performed in a network node for enabling a proximity services, ProSe, operation for a wireless device on a non-serving carrier, the network node serving the wireless device on a cell on a serving carrier, the method comprising: - determining whether a target cell on the non-serving carrier, on which the wireless device is to perform the ProSe operation, is one of known and unknown to the wireless device based on at least the wireless device being synchronized to the target cell on the non-serving carrier, wherein the wireless device being synchronized to the target cell comprises the wireless device knowing a timing of the target cell and being able to receive radio signals from the target cell, - configuring (320, 330) the wireless device: - with a first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, wherein the first gap configuration comprises a gap of a duration (delta-T2) before the start of a ProSe operation duration (delta-T3), and - with a second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device, wherein the second gap configuration comprises a gap of a duration (delta-T4) before the start of the ProSe operation duration (delta-T3), and - adapting scheduling of the wireless device on the cell based on one of the first gap configuration and the second gap configuration, wherein adapting the scheduling of the wireless device comprises not scheduling the wireless device on the cell on the serving carrier during one of: - the duration (delta-T2) of the gap of the first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, and - the duration (delta-T4) of the gap of the second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device. - determining whether a target cell on the non-serving carrier, on which the wireless device is to perform the ProSe operation, is one of known and unknown to the wireless device based on at least the wireless device being synchronized to the target cell on the non-serving carrier, wherein the wireless device being synchronized to the target cell comprises the wireless device knowing a timing of the target cell and being able to receive radio signals from the target cell, - configuring (320, 330) the wireless device: - with a first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, wherein the first gap configuration comprises a gap of a duration (delta-T2) before the start of a ProSe operation duration (delta-T3), and - with a second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device, wherein the second gap configuration comprises a gap of a duration (delta-T4) before the start of the ProSe operation duration (delta-T3), and - with a first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, wherein the first gap configuration comprises a gap of a duration (delta-T2) before the start of a ProSe operation duration (delta-T3), and - with a second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device, wherein the second gap configuration comprises a gap of a duration (delta-T4) before the start of the ProSe operation duration (delta-T3), and - adapting scheduling of the wireless device on the cell based on one of the first gap configuration and the second gap configuration, wherein adapting the scheduling of the wireless device comprises not scheduling the wireless device on the cell on the serving carrier during one of: - the duration (delta-T2) of the gap of the first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, and - the duration (delta-T4) of the gap of the second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device. - the duration (delta-T2) of the gap of the first gap configuration for the case that the target cell on the non-serving carrier is known to the wireless device, and - the duration (delta-T4) of the gap of the second gap configuration for the case that the target cell on the non-serving carrier is unknown to the wireless device.