Patent ID: 8250443

Claim:
A method of transmitting a reception acknowledgement in a wireless communication system, performed by a user equipment, the method comprising: determining a M downlink subframe associated with an uplink subframe n at a specific uplink-downlink configuration, where M is the number of elements in a set K in accordance with the specific uplink-downlink configuration; receiving a bundling indicator from a base station, the bundling indicator indicating a total number of subframes with at least one assigned physical downlink shared channel (PDSCH) transmission within downlink subframe n-k, where kεK; determining a counter value including a total number of at least one physical downlink control channel (PDCCH) detected by the user equipment in downlink subframe n-k, where kεK, each detected PDCCH carrying a downlink assignment used for each PDSCH transmission; determining whether at least one downlink assignment is missed based on the bundling indicator and the counter value; and transmitting a ACK/NACK signal in the uplink subframe n to the base station, wherein the ACK/NACK signal is a NACK if at least one downlink assignment is determined as missed.