A network node, wireless device and methods for switching between an active and target bandwidth parts. A method in a network node includes selecting one or more resource blocks in the target bandwidth part for a transmission or reception between the wireless device and the network node. The selected resource blocks to be used in the target bandwidth part are indicated in a resource allocation field of a downlink control channel information in the active bandwidth part, the allocation field having information bits. The resource allocation field in the active bandwidth part and the information bits therein are configured based on a target bandwidth part resource allocation type. The target bandwidth part resource allocation type indicates whether the information bits include a bitmap corresponding to one or more resource block groups, or an integer value corresponding to a starting resource block and a length of the allocation in resource blocks.