Patent ID: 9276727
Filing Date: 2016-03-01
CPC Classification: H04B,H04J,H04L,H04W

Claim Text:
1. A method for an apparatus to transmit acknowledgement/negative acknowledgement (ACK/NACK) signals in a wireless communication system, the method comprising: spreading, by the apparatus, ACK/NACKs using spreading codes of a spreading factor, the spreading factor being one of a spreading factor 2 and a spreading factor 4; and for ACK/NACK transmission, transmitting, by the apparatus, each of one or more physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) groups through a plurality of units of four resource elements, each PHICH group carrying one or more spread ACK/NACKs, wherein a total number of allocated PHICH groups for the spreading factor 2 is determined as twice of a total number of allocated PHICH groups for the spreading factor 4; wherein a PHICH group index and a spreading code index for an ACK/NACK is determined by using the total number of allocated PHICH groups.