The disclosure relates to a network node and a user device. The network node configured to determine a resource indicator comprising a first start index and a first number of frequency resources, wherein the first start index and the first number of frequency resources are used for allocating a first set of contiguous frequency resources within a first sub-band, and a corresponding first set of contiguous frequency resources within a second sub-band, wherein the first sub-band and the second sub-band are non-overlapping and comprise equal number of frequency resources, a transceiver configured to transmit a transmission grant comprising the resource indicator to a user device.