Abstract: A method, apparatus and computer program for transmitting a data frame are described, which may enhance transmission efficiency by transmitting data frames of a plurality of colliding data frames based on a priority of the data frames. For one or more (or all) of a plurality or colliding data frames, a backoff time may be calculated. The calculation of the backoff time may be based on a relative priority of a given data frame as compared to the other colliding data frames. One or more (or all) of the colliding data frames may be transmitted based on the calculated backoff time.

Abstract: A device is disclosed for detecting a frame synchronous signal which has been applied to a communication system for indicating a starting point of transmitted data. The frame synchronous signal detector includes a parallel converter, a detector, and a buffer. The parallel converter sequentially divides parallel data into segments. The detector compares data of each of the segments with the data of the frame synchronous signal which has been mapped, and from this comparison, precisely detects the data of the frame synchronous signal even though data having an abnormal format is inputted.