Method and apparatus for transmitting reverse ack/nack for forward control channel in mobile communication system supporting harq

A mobile station apparatus for transmitting a reverse Acknowledgement/Non-Acknowledgement (ACK/NACK) for control information in a mobile communication system supporting Hybrid Automatic Repeat reQuest (HARQ), the apparatus comprising:

• a control unit for determining whether to transmit the ACK/NACK for the control information when the control information for decoding a packet is received from a base station over a forward control channel, wherein the packet is received from the base station in an HARQ scheme over a forward data channel, and an mth sub-packet corresponding to each retransmission of the packet is received from the base station;
• and
• a transmitter module for transmitting the ACK/NACK for the control information to the base station over a first reverse ACK channel at a time point determined by the control unit.