A method is disclosed of constructing a wake-up signal for waking up one or more of a plurality of wireless communication receivers, wherein each of the plurality of wireless communication receivers is adapted to receive in accordance with respective standard. The method comprises selecting a collection of sequences of symbols and dividing the collection of sequences into a plurality of groups, wherein all sequences of a group comprise a same first set of symbols. The method also comprises selecting one of the groups, and letting the first set of symbols of the selected group indicate one or more standards corresponding to the one or more of the wireless communication receivers to be woken up. The wake-up signal is then constructed based on a sequence of symbols of the selected group. The sequences of symbols of the collection may be of different lengths and the selected group may comprise sequences of symbols of different lengths. In such embodiments, the step of dividing the collection of sequences into a plurality of groups may comprise letting a first sequence and a second sequence (wherein the first sequence has a shorter length than the second sequence) belong to a same group if the first sequence and any part of the second sequence (wherein the part has the same length as the first sequence) differ in less than a number of positions. Corresponding arrangement and computer program product are also disclosed.