A method for performing fragmented transmission is disclosed. The method by a first ultra-wide band (UWB) device includes identifying a transport packet for fragmented transmission, obtaining a plurality of fragmented packets from the transport packet, and transmitting the plurality of fragmented packets through a UWB channel to a second UWB device at a preset transmission interval. Each of the plurality of fragmented packets may include an STS field and a fragmented payload, and the STS field may be included in a front end of the fragmented packet.