Provided are a channel or signal sending method and apparatus, and a storage medium. The method includes: if a transmission direction configuration of the first carrier or the first carrier group indicates that an uplink transmission is sent within the transmission time of the first transmission, sending, by a terminal, the first transmission, and canceling the sending of the second transmission or sending the second transmission with reduced power; otherwise, performing, by a terminal, at least one of the following modes: sending the first transmission, and canceling the sending of the second transmission or sending the second transmission with reduced power; sending the second transmission, and canceling the sending of the first transmission or sending the first transmission with reduced power; determining whether to send the first transmission or the second transmission by the terminal itself.