Patent ID: 9674835
Date: 2017-06-06
CPC Classifications: H04L,H04W

Claim:
1. A signal transmitting method of a base station (BS) in a wireless communication system using carrier aggregation (CA), the signal transmitting method comprising: transmitting a physical downlink shared channel (PDSCH) in a downlink secondary cell and a physical downlink control channel (PDCCH) indicating the PDSCH in a downlink primary cell to a user equipment (UE); and receiving a reception acknowledgement response (ACK/NACK) to the PDSCH, transmitted in an uplink primary cell, from the UE, wherein the PDSCH is transmitted from a point of time when the downlink secondary cell is available, wherein a subframe for the reception ACK/NACK is determined based on a delay time of the PDSCH transmission caused by the downlink secondary cell availability from a start time of a subframe of the PDSCH transmission scheduled by the PDCCH, and wherein when the PDCCH is transmitted in an n-th subframe and the PDSCH is transmitted for a predetermined time that exceeds a preset period of time from a start time of the nth subframe scheduled for the PDSCH, the reception ACK/NACK is transmitted in an (n+5)th subframe.