Patent ID: 9722754
Date: 2017-08-01
CPC Classifications: H04L,H04W

Claim:
1. A method of transmitting an uplink (UL) ACK (acknowledgement)/NACK (negative ACK) signal, which is transmitted by a user equipment (UE) in a wireless communication system, the method comprising: receiving scheduling information from a network on a primary downlink (DL) cell; receiving one or more DL data signals based on the scheduling information from the network on at least one of the primary DL cell and a secondary DL cell; and transmitting an ACK/NACK signal corresponding to the one or more downlink data signals to the network, wherein if two or more downlink data signals are received, Physical Uplink Control Channel (PUCCH) format 3 is used for transmitting the ACK/NACK signal, wherein if only one downlink data signal is received, a specific PUCCH format for transmitting the ACK/NACK signal is determined according to whether the one downlink data signal is received on the primary DL cell or the secondary DL cell, wherein the specific PUCCH format is PUCCH format 3 when the one downlink data signal is received on the primary DL cell and the ACK/NACK signal is to be transmitted on a secondary UL cell, and wherein the specific PUCCH format is PUCCH format 1a or 1b when the one downlink data signal is received on the secondary DL cell and the ACK/NACK signal is to be transmitted on a secondary UL cell.