According to one aspect there is provided a method in a first network node of a telecommunication network. The network has a plurality of base stations which are operable to transmit a broadcast channel repetition pattern comprising at least one time window of a first mode of operation. The first mode of operation is interspersed between periods of a second mode of operation. The number of repetitions of a broadcast channel in a given period is greater in the first mode than in the second mode. The method comprises determining first data regarding a broadcast channel repetition pattern to be or being transmitted by a first base station. The first data comprises at least timing information about the timing of the time windows of the first mode of operation. The method also comprises sending the first data to a second network node that controls operation of a second base station neighboring the first base station.