Patent ID: 9667401
Date: 2017-05-30
CPC Classifications: H04L,H04W

Claim:
1. A method for transmitting Acknowledgement/Negative Acknowledgement (ACK/NACK) information in a wireless communication system, the method performed by a User Equipment (UE) configured to use a Physical Uplink Control Channel (PUCCH) format 3 and comprising: configuring a PUCCH format 3 for a transmission of the ACK/NACK information; and transmitting the ACK/NACK information for downlink transmission in a downlink subframe set including M downlink subframes in one uplink subframe, wherein M>1, wherein a plurality of serving cells are configured for the UE and include one Primary Cell (PCell) and at least one Secondary Cell (SCell), wherein the UE transmits the ACK/NACK information using a PUCCH format 1b when a specific condition is met, wherein the UE transmits the ACK/NACK information using the PUCCH format 3 when the specific condition is not met, wherein the specific condition comprises a first condition in case the ACK/NACK information corresponds to one Physical Downlink Shared Channel (PDSCH) without a corresponding Physical Downlink Control Channel (PDCCH) received only on the PCell in the downlink subframe set, and wherein the specific condition further comprises a second condition in case the ACK/NACK information corresponds to one PDSCH indicated by detection of a corresponding PDCCH having a Downlink Assignment Index (DAI) value of 1 or a third condition in case a Semi-Persistent Scheduling (SPS) release PDCCH has a DAI value of 1.