Assume that the current channel is located at a current frequency. According to an embodiment the RSSI measurements from the wireless devices 300a, 300b comprise RSSI measurements performed at the current frequency as well as at at least one further frequency. The at least one further frequency is located at a frequency offset to the current frequency (or even to the current frequency interval). The at least one further frequency could therefore be denoted a neighbour frequency. As an example, the frequency offset could be selected to have a value in the range [2.5+BW, 5+BW] MHz, where BW is the occupied bandwidth of the current frequency interval.

As an example, after the wireless devices 300a, 300b successfully camp on the network node 200 (or on cell in which the network node 200 provides network access), the network node 200 could instruct the wireless devices 300a, 300b to perform RSSI measurements on one or more neighbor frequencies for inter-frequency RSSI measurement. Such instructions could be provided from the network node 200 to the wireless devices 300a, 300b in an information element denoted MeasConfig.

That is, the at least one further frequency is located outside the current frequency interval. The RSSI measurements thereby represent measurements performed both inside the current frequency interval and outside the current frequency interval. It could thereby be possible for the network node 200 to check how many wireless devices 300a, 300b that have strong interference from one or more neighbor frequencies.

The channel reconfiguration could then be triggered when the RSSI measurements performed at the at least one further frequency indicate high interference.