Patent ID: 8885588

Claim:
A method of determining a physical hybrid-ARQ indicator channel (PHICH) resource in a wireless communication system, the method comprising: transmitting a first codeword and a second codeword through a physical uplink shared channel (PUSCH); and determining a first PHICH resource and a second PHICH resource respectively corresponding to the first codeword and the second codeword, wherein the first PHICH resource is determined based on a lowest physical resource block (PRB) index I PRB — RA lowest — index among PRBs in a first slot to which the PUSCH is mapped, and wherein the second PHICH resource is determined based on the lowest PRB index I PRB — RA lowest — index and an offset β according to the equation below: n PHICH group =(( I PRB —RA lowest — index +β)+ n DMRS )mod N PHICH group +I PHICH N PHICH group , where n PHICH group is an index of a PHICH group, n DMRS is a cyclic shift field for a demodulation reference signal (DMRS), I PRB — RA lowest — index is the lowest PRB index among PRBs in a first slot to which the PUSCH is mapped, β is the offset, N PHICH group is the number of PHICH groups, and I PHICH is a value 0 or 1.