The invention relates to a method and a system for transmitting data from a medium access control device (2) via a digital interface (IF1) to a physical layer (4) and to an antenna (5), wherein the physical layer (4) comprises a base band (4) with a base band controller (7) and a data processing pipeline (3) comprising a plurality of functional blocks (FB1 . . . 13), comprising the steps of: detecting an end of a frame of payload data, which leaves the antenna (5), at a predetermined point (P1 to P3) within the data processing pipeline (3), especially at the end of the data processing pipeline (3), thereupon, starting a timer (T1) for delaying a de-assertion of an activity signal (PHY_ACTIVE) of the physical layer (4), and after expiration of the timer (T1), de-asserting the activity signal (PHY_ACTIVE).