Communication device and communication method
Provided is a communication device that implements error correction in a physical layer in combination with HARQ. The communication device on the transmitting side adds a CRC sequence to an information sequence, divides an information sequence having a CRC sequence added thereto into a plurality of sequences, implements first FEC coding by using a sequence obtained by division, adds a CRC sequence to a coded sequence obtained after first FEC coding, implements second FEC coding by using a coded sequence having a CRC sequence added thereto, couples coded sequences obtained after second coding, transmits a coded information sequence obtained after coupling to another communication device, and controls retransmission with a coded sequence obtained after first coding as a unit.
1. A communication device, comprising:
a first CRC addition unit that adds a first CRC sequence to an information sequence to be transmitted;
a division unit that divides an information sequence having the first CRC sequence added thereto into a plurality of sequences;
a first FEC coding unit that implements first FEC coding by using a sequence obtained by division;
a second CRC addition unit that adds a second CRC sequence to a coded sequence obtained after the first FEC coding;
a second FEC coding unit that implements second FEC coding by using a coded sequence having the second CRC sequence added thereto;
a coupling unit that couples coded sequences obtained after the second FEC coding;
a transmitting unit that transmits a coded information sequence obtained after coupling to another communication device; and
a retransmission control unit that controls retransmission with the coded sequence obtained after the first FEC coding as a unit.
2. The communication device according to claim 1 , further comprising
a determination unit that determines whether to implement the first FEC coding or not.
3. The communication device according to claim 2 ,
wherein the determination unit determines whether to implement the first FEC coding or not on a basis of at least one of status of a receiving side communication device, an application of a target information sequence, or status of the target information sequence.
4. The communication device according to claim 1 ,
wherein the second FEC coding unit implements the second FEC coding by using some of a plurality of coded sequences obtained after the first FEC coding.
5. The communication device according to claim 1 ,
wherein the second FEC coding unit punctures some of a plurality of coded sequences obtained after the first FEC coding, and implements the second FEC coding by using other coded sequences.
6. The communication device according to claim 1 ,
wherein the coupling unit couples some of a plurality of coded sequences obtained after the second FEC coding.
7. The communication device according to claim 1 ,
wherein the retransmission control unit retransmits at least some of coded sequences that have not been transmitted in last time transmission.
8. The communication device according to claim 1 ,
wherein the retransmission control unit implements retransmission by a combination of different coded sequences for each transmission time.
9. The communication device according to claim 1 ,
wherein the retransmission control unit selects the coded sequence to be retransmitted on a basis of one of transmission or reception result of previous transmission.
10. A communication method, comprising:
adding a first CRC sequence to an information sequence to be transmitted;
dividing an information sequence having the first CRC sequence added thereto into a plurality of sequences;
implementing first FEC coding by using a sequence obtained by division;
adding a second CRC sequence to a coded sequence obtained after the first FEC coding;
implementing second FEC coding by using a coded sequence having the second CRC sequence added thereto;
coupling coded sequences obtained after the second FEC coding;
transmitting a coded information sequence obtained after coupling to another communication device; and
a retransmission step of controlling retransmission with the coded sequence obtained after the first FEC coding as a unit.