A method, an apparatus, and a computer-readable medium for wireless communication are provided. The apparatus retrieves a particular number corresponding to a UE. To retrieve the particular number, the apparatus may receive the particular number through a channel request from the UE. Alternately, the apparatus may assign the particular number to the UE in order to retrieve the particular number. The apparatus determines a resource block within a coverage class based on the particular number. To determine the resource block, the apparatus maps the particular number to a resource block number within the coverage class using a hash function. The resource block number identifies the resource block. The apparatus transmits a device-specific control message to the UE using the determined resource block.