Patent ID: 9407416
Filing Date: 2016-08-02
CPC Classification: H04L,H04W

Claim Text:
1. A method for performing a hybrid automatic repeat request (HARQ), the method performed by a base station (BS) and comprising: transmitting an uplink (UL) grant for a first subframe of a second serving cell through a first serving cell; receiving UL data based on the UL grant in the first subframe; transmitting an acknowledgement/non-acknowledgement (ACK/NACK) for the UL data through a physical HARQ indicator channel (PHICH) in subframe I of the first serving cell; and receiving non-adaptively retransmitted UL data in a second subframe of the second serving cell if a NACK for the UL data has been transmitted through the PHICH in the subframe I of the first serving cell, wherein the first serving cell and the second serving cell use different UL-downlink (DL) configurations, and each of the UL-DL configurations is information on which each subframe within a time division duplex (TDD) frame is configured as a UL subframe, a DL subframe or a special subframe, and wherein if a PHICH resource corresponding to the UL data is not present in the subframe I, the non-adaptively retransmitted UL data is not received in the second subframe of the second serving cell.