A method comprises configuring a wireless device with a plurality of carriers, each of the plurality of carriers comprising a communication channel between the wireless device and one of the network node or another wireless device, and grouping the configured carriers into at least a first group and a second group. The method comprises associating each of the configured carriers of the first group with one of a plurality of possible carrier indicator field values, and associating each of the configured carriers of the second group with one of the plurality of possible carrier indicator field values. The method comprises communicating, to the wireless device on a first carrier of either the first or second groups, information related to a particular carrier in the same group as the first carrier, wherein the particular carrier is identified by its associated carrier indicator field value.