1. A method in a wireless device, said wireless device supporting a first transmission bandwidth associated with a first set of enumerable elements, for enabling access to a radio network node, the method comprising:obtaining information about a carrier operated by the radio network node, wherein:
the carrier has a second transmission bandwidth associated with a second set of enumerable elements; and
the second transmission bandwidth is wider than the first transmission bandwidth; and
based on the information about the carrier, determining a mapping scheme for mapping the first set of enumerable elements, associated with the first transmission bandwidth, to a subset of the second set of enumerable elements associated with the second transmission bandwidth, wherein the mapping scheme comprises:
mapping a first enumerable element of the first set to an enumerable element of the second set that corresponds to a center frequency of the second transmission bandwidth; and
mapping, in an alternating manner, subsequent enumerable elements of the first set to enumerable elements, of the second set, that correspond to frequencies increasingly higher and lower than the center frequency of the second transmission bandwidth.