The method and media access controller for wireless broadband communication with the variable size of the data units and delayed development of data units

Media access controller, comprising: To produce a per-flow schedulers a payload of data units from one or more service data units of an associated service flow; and a synthesizing means for data units, to construct an initial data unit from the payload of data units after the payload of data units entering a request for retransmission window; the per-flow schedulers reduced size of the useful data of data units when a pulse magnitude of the physical layer changes frequently, and the size of the useful data is increased when the pulse magnitude of the physical layer changes less frequently.