A method in a network node of a heterogeneous wireless communication system, for reducing uplink interference at a radio base station with restricted wireless access for certain user equipment, the uplink interference being caused by a user equipment served by the network node, wherein the user equipment is not allowed to access the radio base station, the method comprising: - receiving measurement reports from one or more user equipments served by the network node, - identifying the user equipment causing uplink interference at the radio base station among said one or more user equipments, based on the received measurement reports, the method characterized in that it comprises: - transmitting (330, 331) a request to the identified user equipment to acquire a total uplink received interference at the radio base station, - receiving (330, 332) from the radio base station via the identified user equipment, the total uplink received interference at the radio base station, in response to the request, - determining whether the total uplink received interference at the radio base station exceeds a first threshold, and - adjusting at least one of a transmit power, a transmission activity, and a scheduling of the identified user equipment when the total uplink received interference at the radio base station exceeds the first threshold, such that the uplink interference caused by the identified user equipment is reduced. - receiving measurement reports from one or more user equipments served by the network node, - identifying the user equipment causing uplink interference at the radio base station among said one or more user equipments, based on the received measurement reports, the method characterized in that it comprises: - transmitting (330, 331) a request to the identified user equipment to acquire a total uplink received interference at the radio base station, - receiving (330, 332) from the radio base station via the identified user equipment, the total uplink received interference at the radio base station, in response to the request, - determining whether the total uplink received interference at the radio base station exceeds a first threshold, and - adjusting at least one of a transmit power, a transmission activity, and a scheduling of the identified user equipment when the total uplink received interference at the radio base station exceeds the first threshold, such that the uplink interference caused by the identified user equipment is reduced. - transmitting (330, 331) a request to the identified user equipment to acquire a total uplink received interference at the radio base station, - receiving (330, 332) from the radio base station via the identified user equipment, the total uplink received interference at the radio base station, in response to the request, - determining whether the total uplink received interference at the radio base station exceeds a first threshold, and - adjusting at least one of a transmit power, a transmission activity, and a scheduling of the identified user equipment when the total uplink received interference at the radio base station exceeds the first threshold, such that the uplink interference caused by the identified user equipment is reduced.