Method and apparatus of transmitting ack/nack

Abstract

A method for transmitting an uplink signal by a user equipment (UE) in a wireless communication system, and the UE therefore are discussed. The method according to one embodiment includes receiving, by the UE, control information through a physical downlink control channel (PDCCH); determining, by the UE, a physical uplink control channel (PUCCH) resource by adding a first index offset and a second index offset to a lowest index of one or more resource units used for the PDCCH, the first index offset being signaled through the PDCCH and the second index offset being signaled through higher layer signaling; and transmitting, by the UE, acknowledgment/negative-acknowledgment (ACK/NACK) information using the PUCCH resource.

Dependencies are inferred from the claim text.