Retransmission control method and transmitter in wireless communication system

A transmitter for a wireless communication system which transmits a frame comprising data and control information necessary for reception processing of the data and, when a reception failure is notified by a receiver, retransmits the frame that failed to be received, the transmitter comprising:

• a control information generation unit for generating first control information that can be different for a new frame transmission and a repeat frame transmission and second control information that is the same for the new frame transmission and the repeat frame transmission;
• a control unit for acquiring information indicating whether or not the receiver has correctly received the control information consisting of the first and second control information and data and, when the control information is not transmitted during the repeat frame transmission;
• and
• a transmission unit for transmitting a frame in which the data and the control information consisting of the first and second control information are multiplexed and for transmitting a frame in which the data the first control information are multiplexed.

A wireless communication system, which comprises a transmitter and a receiver, and in which a frame comprising data and control information necessary for reception processing of the data is transmitted from the transmitter to the receiver and, when a reception failure is notified by the receiver, the transmitter retransmits the frame that failed to be received, wherein the transmitter comprises:

• a control information generation unit for generating first control information that can be different for a new frame transmission and a repeat frame transmission and second control information that is the same for the frame transmission and the repeat frame transmission;
• a control unit for acquiring information indicating whether or not the receiver has correctly received the control information consisting of the first and second control information and data and, when the control information has been correctly received, executing control so that the second control information is not transmitted during the repeat frame transmission;
• an identification information generation unit for generating identification information for indentifying whether or not the second control information is contained in the frame;
• and
• a transmission unit for transmitting a frame in which (1) the data, (2) the first control information or the control information consisting of the first and second control information, and (3) the identification information are multiplexed;
• and the receiver comprises;
• a receiving unit for receiving the frame;
• a normal reception check unit for checking whether the control information consisting of the first and second control information and data have been correctly received for each reception of the frame, and conveying the check results to the transmitter;
• a control information storage unit for storing the second control information contained in the frame;
• and
• a reception control unit for indentifying whether the second control information is contained in the frame based on the indentification information contained in the frame and, when the second information is contained in the frame, executing reception control of the data based on the received first and second control information, and storing the second control information, and when the second information is not contained in the frame, executing the reception control of the data based on the first control information that has been received and the second control information that has been stored.