Patent ID: 8891462

Claim:
A method for wireless communications, comprising: receiving a plurality of codewords from a user equipment (UE) via an uplink component carrier; and determining at least a first index pair and a second index pair for identifying resources of a downlink channel to use for transmitting acknowledgement messages for the received codewords, the first index pair being determined based at least in part on a first set of parameters, the first set of parameters including a number for a demodulation reference signal (DMRS), a size of a spreading factor used for modulation in a physical hybrid automatic repeat request indicator channel (PHICH), a lowest index of physical resource blocks (PRBs) in a first slot of a corresponding physical uplink shared channel (PUSCH) transmission, a number of PHICH groups, and an index, the second index pair being determined based on the first set of parameters, a first delta value, and a second delta value, the first delta value and the second delta value being used for the second index pair and not being used for the first index pair, and the first delta value being different from the second delta value.