A DL signal including a plurality of SS blocks can be received. At least one SS block can be detected from the plurality of SS blocks. A SS block can be selected from the detected at least one SS block. A SS block can be selected from at least one SS block detected from the plurality of SS blocks. A subset of RACH resources and a subset of RACH preambles associated with the selected SS block can be identified. A RACH resource can be selected from the subset of RACH resources and a RACH preamble can be selected from the subset of RACH preambles. The selected RACH preamble can be transmitted on the selected RACH resource. An RA-RNTI can be determined based on at least the selected RACH resource. At least a PDSCH including a RAR message can be received. The PDSCH can be based on the selected SS block and based on the determined RA-RNTI.