Abstract: A method and apparatus are provided for selecting a transport format combination utilized in a mechanism of a wireless communication network for multiplexing data units between logical channels and transport channels. Upon receiving a configuration table comprising logical and transport channel information, a logical channel size restriction, a transport format combination set, and a transport format set, a transport format selection mechanism prioritizes each transport channel, sorts the transport formats according to priority and minimum buffer occupancy; wherein associated with each sorted transport format is a minimum and maximum buffer occupancy, and transport format combinations which use a transport format of a size equal to or less than the maximum buffer occupancy.