Patent ID: 8553529
Filing Date: 2013-10-08
Classification: H04L

Abstract:
1. A method of performing hybrid automatic repeat request (HARQ) of a user equipment (UE) in a multiple-carrier system, the method comprising: transmitting uplink data on an uplink carrier; and receiving acknowledgement (ACK)/not-acknowledgement (NACK) for the uplink data on a downlink carrier associated with the uplink carrier, wherein the downlink carrier is associated on the basis of an index of the uplink carrier, a radio resource used for transmission of the uplink data, and a demodulation reference signal (DM-RS) applied to the uplink data, wherein the downlink carrier is identified by an index determined based on a value calculated by dividing a logical index for the total sum of resource blocks of all uplink carriers by the number of all downlink carriers.