1. A method of transmitting a physical random access channel (PRACH) from a user equipment (UE), comprising:transmitting, from the UE to a network entity, a first PRACH transmission with a first subcarrier spacing;
determining, by the UE, that the first PRACH transmission to the network entity is not successful;
transmitting, from the UE to the network entity, a second PRACH transmission with a second subcarrier spacing in response to determining that the first PRACH transmission is not successful, wherein the first subcarrier spacing is different from the second subcarrier spacing; and
transmitting, by the UE to the network entity, one or more additional PRACH transmissions until the UE determines that one of the one or more additional PRACH transmissions are successful or a PRACH re-transmission attempt limit is reached, wherein the one or more additional PRACH transmissions are sent with a subsequent subcarrier spacing that is different from the first subcarrier spacing and the second subcarrier spacing.