Patent ID: 8391127

Claim:
A method for transmitting an acknowledgement (ACK)/not-acknowledgement (NACK) signal of relay station, the method comprising: determining a sequence corresponding to one of ACK signal and NACK signal; mapping the sequence onto three Hybrid automatic repeat request Mini-Tiles (HMTs), each HMT comprising two orthogonal frequency division multiple access (OFDMA) symbols contiguous in time domain by two subcarriers contiguous in frequency domain, wherein the three HMTs are continuous in the time domain and discontinuous in the frequency domain; determining whether a transition gap is inserted in at least one of a first OFDMA symbol and a last OFDMA symbol of the three HMTs; when the transition gap is inserted in the first OFDMA symbol of the three HMTs, one HMT, among the three HMTs, in the first OFDMA symbol and a second OFDMA symbol is punctured, and when the transition gap is inserted in the last OFDMA symbol of the three HMTs, one HMT, among the three HMTs, in the last two OFDMA symbols is punctured; and transmitting the mapped sequence to a base station, wherein the sequence is an orthogonal sequence having a four bit size and the four bits of the orthogonal sequence are mapped to each of the three HMTs.