Communications method, communications apparatus and communications system using same communications apparatus

A communications system, including:

• a communications apparatus which receives a data packet, a payload of the data packet is composed of a plurality of blocks, performs error correction decoding on said plurality of blocks, selects only an undecodable block out of said plurality of blocks, and transmits a request for a retransmission of the undecodable block;
• and another communications apparatus which transmits a data packet, a payload of the data packet is composed of a plurality of blocks and when having received a request for a retransmission of an undecodable block, extends the size of the payload of the data packet to be transmitted next or subsequently by adding the block, a retransmission of which has been requested, to the blocks constituting the data packet to be transmitted next or subsequently, thereby increasing a number of blocks in the data packet to be transmitted next or subsequently,
• a data packet receiving end transmits, to a data packet transmitting end, a request for a retransmission of only an undecodable block out of a data packet that has been received;
• and
• the data packet transmitting end, in response to the request for a retransmission, retransmits a corresponding block.

A communications system, including:

• a communications apparatus which receives a data packet, a payload of the data packet is composed of a plurality of blocks, performs error correction decoding on said plurality of blocks, selects only an undecodable block out of plurality of blocks that has been received, and transmits a request for a retransmission of the undecodable block;
• and another communications apparatus which transmits a data packet, a payload of the data packet is composed of a plurality of blocks of block-type error correction codes, and when having received a request for a retransmission of an undecodable block, extends the size of the payload of a data packet to be transmitted next of subsequently by adding the block, a retransmission of which has been requested, to the blocks constituting the data packet to be transmitted next or subsequently, thereby increasing the number of blocks in the data packet to be transmitted next or subsequently,
• a data packet receiving end transmits, to a data packet transmitting end, a request for a retransmission of only an undecodable block out of a data packet that has been received;
• and
• the data packet transmitting end, in response to the request for a retransmission, retransmits a corresponding block.