A resource allocation message includes a resource allocation field. The resource allocation field includes a first field that includes either a first sub-field or a first sub-field and a second sub-field with the first sub-field configured to hold a first value that indicates two or more logical indices and the second sub-field configured to hold a third value. Each of the logical indices is associated with a sub-band pair of resource units. The sub-band pair of resource units includes either a first sub-band resource unit or a first sub-band resource unit and a second sub-band resource unit. The resource allocation field also includes a second field configured to hold a second value that indicates, either alone or in combination with the third value, a first sub-band resource unit or a second sub-band resource unit for each of the sub-band pair of resource units indicated by the first field.