A method applied to a long term evolution-advanced, LTE-A, system and performed by a user equipment, UE, the method comprising: sequencing downlink subframes for transmitting data with respect to each of a primary cell and a secondary cell; generating first feedback information related to data receiving status for the primary cell in a first plurality of subframes of the downlink subframes and second feedback information related to data receiving status for the secondary cell in the first plurality of subframes of the downlink subframes according to a result of the sequencing; selecting, based on a channel selection method, a constellation point and an uplink channel resource corresponding to a combination of the first feedback information and the second feedback information; and transmitting, on the uplink channel resource, the constellation point to a base station, wherein the uplink channel resource is selected from four uplink resources including: a first uplink resource and a second uplink resource determined from the primary cell, and a third uplink resource and a fourth uplink resource determined from the secondary cell, and wherein, for the primary cell, the first uplink resource and second uplink resource are determined from a physical downlink control channel, PDCCH, with a downlink assignment index, DAI, being 1, wherein the minimum control channel element, CCE, index of the PDCCH is n, the first and second uplink resources are determined by mapping, using an LTE method from CCE indexes n and n+1, and wherein for the secondary cell the third uplink resource and fourth uplink resource are determined for the PDCCH with a DAI being 1 and wherein the minimum CCE index of the PDCCH is n, the third and fourth uplink resources are determined by mapping using an LTE method from CCE indexes n and n+1; or the first uplink resource is determined from the PDCCH with a DAI, being 1 and the second uplink resource is determined by multiple candidate uplink resources configured by higher layer signaling and an ACK/NACK resource indicator, ARI, for PDCCHs of the secondary cell for indicating an actual used uplink resource, and wherein for the secondary cell the third uplink resource is determined for the PDCCH with a DAI being 1, and the fourth uplink resource is determined by multiple candidate uplink resources configured by higher layer signaling and the ACK/NACK resource indicator, ARI, for PDCCHs of the secondary cell for indicating an actual used uplink resource. sequencing downlink subframes for transmitting data with respect to each of a primary cell and a secondary cell; generating first feedback information related to data receiving status for the primary cell in a first plurality of subframes of the downlink subframes and second feedback information related to data receiving status for the secondary cell in the first plurality of subframes of the downlink subframes according to a result of the sequencing; selecting, based on a channel selection method, a constellation point and an uplink channel resource corresponding to a combination of the first feedback information and the second feedback information; and transmitting, on the uplink channel resource, the constellation point to a base station, wherein the uplink channel resource is selected from four uplink resources including: a first uplink resource and a second uplink resource determined from the primary cell, and a third uplink resource and a fourth uplink resource determined from the secondary cell, and a first uplink resource and a second uplink resource determined from the primary cell, and a third uplink resource and a fourth uplink resource determined from the secondary cell, and wherein, for the primary cell, the first uplink resource and second uplink resource are determined from a physical downlink control channel, PDCCH, with a downlink assignment index, DAI, being 1, wherein the minimum control channel element, CCE, index of the PDCCH is n, the first and second uplink resources are determined by mapping, using an LTE method from CCE indexes n and n+1, and wherein for the secondary cell the third uplink resource and fourth uplink resource are determined for the PDCCH with a DAI being 1 and wherein the minimum CCE index of the PDCCH is n, the third and fourth uplink resources are determined by mapping using an LTE method from CCE indexes n and n+1; or the first uplink resource is determined from the PDCCH with a DAI, being 1 and the second uplink resource is determined by multiple candidate uplink resources configured by higher layer signaling and an ACK/NACK resource indicator, ARI, for PDCCHs of the secondary cell for indicating an actual used uplink resource, and wherein for the secondary cell the third uplink resource is determined for the PDCCH with a DAI being 1, and the fourth uplink resource is determined by multiple candidate uplink resources configured by higher layer signaling and the ACK/NACK resource indicator, ARI, for PDCCHs of the secondary cell for indicating an actual used uplink resource.