Method for retransmitting packets according to decoding failures or reliability

A method for retransmitting packets from a transmitting side, the method comprising:

• transmitting a packet including blocks to a receiving side, wherein the block is configured as codeword bits;
• receiving, from the receiving side, first information indicating at least one block which has been successfully decoded and at least one block which has not been successfully decoded,
• adjusting the size of each block based on the first information,
• wherein adjusting the size of each block comprises increasing the size of a block which is not successfully decoded and reducing the size of a block which is successfully decoded,
• changing the mapping order of each block having an adjusted size;
• and,
• mapping each block to subcarriers in accordance with the changed mapping order,
• wherein mapping each block comprises:
• mapping the block which is not successfully decoded to a first frequency band in which the block which is successfully decoded in a previous transmission is transmitted, and
• mapping the block which is successfully decoded to a second frequency band in which the block which is not successfully decoded in the previous transmission is transmitted;
• and
• retransmitting the packet without a new block in accordance with the mapped result to the receiving side.