Wireless communications systems and methods related to performing random channel access are provided. A first wireless communication device communicates a random access configuration with a second wireless communication device in a first frequency spectrum. The random access configuration includes information associated with a channel characteristic difference between the first frequency spectrum and the second frequency spectrum. The first wireless communication device communicates a random access signal with the second wireless communication device in the second frequency spectrum based on the random access configuration. The first frequency spectrum is a millimeter wave (mmWav) frequency band. The second frequency spectrum is a non-mmWav frequency band.