Method and apparatus for retransmission

A method in which a terminal retransmits using a frame divided into downlink subframes and uplink subframes, the method comprising:

• receiving control information from a base station;
• determining a packet transmission frame offset according to the range of a downlink subframe index in which the control information has been transmitted, from among ranges set based on division information of the frame;
• determining a transmission timing of a data burst based on the packet transmission frame offset and transmitting the data burst to the base station;
• receiving a feedback signal for the transmitted data burst from the base station;
• and
• if an NACK message is included in the feedback signal, determining a retransmission timing of the data burst and retransmitting the same to the base station.

A method in which a terminal conducts an operation for retransmission using a frame divided into downlink subframes and uplink subframes, the method comprising:

• transmitting control information to a terminal;
• receiving a data burst transmitted according to the control information from the terminal;
• obtaining a reference timing parameter calculated based on the size of the number of the divided downlink subframes and the number of the divided uplink subframes;
• determining an index of a downlink subframe for transmitting a feedback signal based on an uplink subframe index in which the data burst has been transmitted;
• determining a frame index for transmitting the feedback signal based on a timing spaced apart by a feedback frame offset from the frame index in which the data burst has been transmitted;
• transmitting the feedback signal to the terminal in the determined indices of the frame and downlink subframe;
• and
• if an NACK message is included in the feedback signal, receiving the data burst retransmitted from the terminal.

A retransmission apparatus, as a retransmitting device of a terminal, comprising:

• a receiver for receiving any one of control information, a first data burst, and a feedback signal for a second data burst transmitted to a base station;
• a transmitter for transmitting a third data burst according to the received control information or a feedback signal for the received first data burst, or retransmitting the second data burst in response to the received feedback signal to the base station;
• and
• a transmission timing determiner for determining a transmission timing of the third data burst, a transmission timing of the feedback signal for the first data burst, and a retransmission timing of the second data burst,
• wherein, when transmitting the third data burst or the feedback signal in the next frame of the frame in which the control information or the first data burst has been transmitted, the transmission timing determiner determines to transmit the third data burst or the feedback signal in the first subframe included in the next frame.