An electronic device includes one or a plurality of processing circuits configured to execute the following operations: adjusting the length of a symbol in a self-contained subframe under a first sub-carrier, such that within a transmission time interval (TTI) of a self-contained subframe under a second sub-carrier: the edge of each symbol of an uplink symbol and downlink symbol in a self-contained subframe under the second sub-carrier is aligned with the edge of the symbol in the self-contained subframe under the adjusted first sub-carrier; furthermore, the first symbol in the self-contained subframe under the adjusted first sub-carrier is longer than the other non-adjusted symbols in the self-contained subframe under the adjusted first sub-carrier.