Patent ID: 8059676

Claim:
A method of communicating by a mobile communication terminal using a frame comprising a plurality of downlink subframes and a plurality of uplink subframes, the method comprising: receiving the plurality of downlink subframes of the frame from a base station, types of the plurality of downlink subframes being divided into at least two types including a first type and a second type, the plurality of downlink subframes of the frame including a first type subframe which is followed by three (3) second type subframes; and transmitting the plurality of uplink subframes of the frame to the base station, types of the plurality of uplink subframes including the first type and the second type, the plurality of uplink subframes of the frame including two (2) second type subframes which are followed by a last subframe of the frame, a type of the last subframe of the frame being the first type, wherein each subframe of the first type includes a first number of orthogonal frequency division multiple access (OFDMA) symbols and each subframe of the second type includes a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number.