Patent ID: 9319203
Filing Date: 2016-04-19
CPC Classification: H04L,H04W

Claim Text:
1. A method for performing HARQ (hybrid automatic repeat request) retransmission by a communication device in a wireless communication system, the method comprising: initially transmitting a data block to a Base Station (BS); attempting a detection of PDCCH (physical downlink control channel) in a predetermined time interval including a plurality of subframes after transmission of an uplink channel signal; and retransmitting the data block using a resource indicated by the PDCCH, wherein a retransmission is indicated by a physical hybrid ARQ indicator channel (PHICH) when the user equipment (UE) is a first type UE, and wherein, when the UE is a second type UE, the retransmission is indicated by a HARQ index included in the PDDCH and a reception of a PHICH corresponding to the retransmission is skipped.