A packet communication method of the present invention includes
establishing a radio layer 2 connection based on a radio layer 2 protocol
between a mobile station and a controller device, determining a
transmission timing of a received data packet based on a quality of
service set in the data packet, and multiplexing, at the determined
transmission timing, the data packet into a radio layer 2 protocol data
unit of a fixed length which is transmitted and received on the radio
layer 2 connection.