Patent ID: 8238300

Claim:
A method of communicating by a mobile communication terminal in communication with a base station, comprising: transceiving a signal based on a frame of data with the base station, the frame of data including a plurality of first type subframes each having a first number of orthogonal frequency division multiple access (OFDMA) symbols, and a plurality of second type subframes each having a second number of orthogonal frequency division multiple access (OFDMA) symbols different from the first number, wherein the first number of OFDMA symbols is seven (7) symbols and the second number of OFDMA symbols is six (6) symbols, wherein the step of transceiving comprises time division duplexing (TDD) the frame with another frame, wherein the frame includes two (2) first type subframes and six (6) second type subframes, wherein a 4th of the six (6) second type subframes is followed by an idle symbol, wherein one of the two (2) first type subframes is followed by at least five (5) of the six (6) second type subframes, which are followed by another one of the two (2) first type subframes, wherein at least one of the plurality of first type subframes and the plurality of second type subframes are grouped into a plurality of downlink subframes followed by a plurality of uplink subframe, and wherein a ratio between the plurality of uplink subframes and the plurality of downlink subframes is one of 4:4, 6:2, 7:1, and 5:3.