Packet transmission method and apparatus

A packet transmission error correction apparatus which uses m error correction code packets formed from n (n>m) data packets including headers, said apparatus comprising:

• data code forming means for forming an n-bit data code portion by reading out from each of the data packets bit information at a bit position x and sequentially arranging the bit information, said data code forming means sequentially shifting a read bit position and repeatedly forming a data code portion corresponding each bit position of the data packets excluding the header;
• error correction code forming means for repeatedly forming an m-bit error correction code portion by coding the bit information of each data code portion formed from said data code forming means, and forming an error correction frame constituted by a data code portion and an error correction code portion for each bit position of the data packets excluding the header;
• interleave processing means for repeatedly assigning each bit information of the error correction code portion as bit information of a corresponding one of the error correction code packets at a bit position corresponding to the read bit position for each error correction frame formed from said error correction code forming means, and thereby forming the m error correction code packets;
• transmitting means for transmitting the formed error correction packets, together with the data packets;
• receiving means for receiving the formed error correction code packets together with the data packets;
• error correction frame reconstruction means for reconstructing, for each bit position of the received data packets excluding the header, the data code portion of the error correction frame by reading out bit information of received data packets at said each bit position and sequentially arranging the read out bit information, and for reconstructing, for each bit position of the received error correction code packets excluding header bits, the error correction code portion of the error correction frame by reading out bit information of received error correction code packets at said each bit position and sequentially arranging the read out bit information;
• data code decoding means for decoding bit information contained in the data code portion on the basis of bit information contained in the corresponding error correction code portion when there is a data loss or a data error in a data packet during transmission;
• and
• error correcting means for reproducing the data packet in which the data loss or the data error has occurred on the basis of bit information contained in the data code portion decoded by said data code decoding means.

A packet transmission error correction apparatus which uses m error correction code packets formed from n (n>m) data packets including headers, said apparatus comprising:

• data code forming means for forming an n-bit data code portion by reading out from each of the data packets bit information at a bit position x and sequentially arranging the bit information, said data code forming means sequentially shifting a read bit position and repeatedly forming a data code portion corresponding each bit position of the data packets excluding the header;
• error correction code forming means for repeatedly forming an m-bit error correction code portion by coding the bit information of each data code portion formed from said data code forming means, and forming an error correction frame constituted by a data code portion and an error correction code portion for each bit position of the data packets excluding the header;
• interleave processing means for repeatedly assigning each bit information of the error correction code portion as bit information of a corresponding one of the error correction code packets at a bit position corresponding to the read bit position for each error correction frame formed from said error correction code forming means, and thereby forming the m error correction code packets;
• transmitting means for transmitting the formed error correction packets, together with the data packets;
• receiving means for receiving the formed error correction code packets together with the data packets;
• error correction frame reconstruction means for reconstructing, for each bit position of the received data packets excluding the header, the data code portion of the error correction frame by reading out bit information of received data packets at said each bit position and sequentially arranging the read out bit information, and for reconstructing, for each bit position of the received error correction code packets excluding header bits, the error correction code portion of the error correction frame by reading out bit information of received error correction code packets at said each bit position and sequentially arranging the read out bit information;
• data code decoding means for decoding bit information contained in the data code portion on the basis of bit information contained in the corresponding error correction code portion when there is a data loss or a data error in a data packet during transmission;
• first packet storage means for temporarily storing the data packets before the packets are transmitted, wherein said data code forming means forms the data code portion from bit information contained in the data packets stored in said first storage means;
• separating means for separating the received packets into the data packets and the error correction code packets;
• and
• second packet storage means for sequentially storing the separated data packets, wherein said error correction frame forming means forms the error correction frame from the data packets stored in said second packet storage means.