Patent ID: 9420579
Filing Date: 2016-08-16
CPC Classification: H04L,H04W

Claim Text:
1. A method for transmitting control information in a communication system by a user equipment (UE) configured with a primary cell having uplink-downlink (UL-DL) configuration #0 and a secondary cell having one of UL-DL configurations #1 to #6, the method comprising: receiving, by the UE, a downlink control information (DCI) format comprising resource allocation information and a downlink assignment index (DAI) field, for the secondary cell; receiving, by the UE, a physical downlink shared channel (PDSCH) indicated by the DCI format through the secondary cell; and transmitting, by the UE, hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information for the PDSCH, wherein if a carrier indicator field (CIF) is enabled in the DCI format, the DAI field is not used in a procedure for transmitting the HARQ-ACK information, regardless of the value of the DAI field in the DCI format, and wherein subframe configurations according to the UL-DL configurations #0 to #6 are shown in the following table 1: where, D denotes a DL subframe, U denotes a UL subframe, and S denotes a special subframe.