Patent ID: 8599760
Filing Date: 2013-12-03
Classification: H04L,H04W

Abstract:
1. A method for error decoupling of feedback data in a wireless access system supporting a carrier aggregation and a Multiple-Input Multiple-Output (MIMO), the method being performed by a mobile station and comprising: receiving downlink data through carriers from a base station; determining feedback states indicating one of an acknowledgement (ACK), a negative acknowledgement (NACK), and a discontinuous transmission (DTX) for each of the carriers in response to the downlink data; grouping the feedback states of the carriers into two or more groups; encoding the grouped feedback states into feedback data in binary per each of the two or more groups for partially decoupling the feedback states; and transmitting the feedback data to the base station, wherein each of the carriers uses up to 2 codewords for the MIMO, and the feedback states indicate one of an ACK of a first codeword, a NACK of the first codeword, an ACK of a second codeword, a NACK of the second codeword, and the DTX, and wherein a number of bits in the feedback data of 5 carriers is different from a number of bits in the feedback data of 4 carriers.