The present invention relates to a method and arrangements where each frequency channel is assigned a primary (global) number and a secondary (in-band) number. In accordance with embodiments of the present invention the primary number for one frequency channel (e.g. unicast downlink channel) and one or more secondary channel numbers to account for the corresponding unicast uplink and/or for one or more MBSFN channels are signalled. The primary (global) number indicates the band and frequency channel number while the secondary (in-band) number indicates the frequency channel within the relevant frequency band.