Wireless communication system, wireless relay station apparatus, wireless terminal station apparatus, and wireless communication method

A wireless communication system comprising:

• a wireless relay station apparatus that transmits a first packet and a second packet to a plurality of wireless terminal station apparatuses, the first packet being different from the second packet,
• wherein the wireless relay station apparatus comprises:
• an error correction encoding unit that selects coding rates to be used for the first packet and the second packet in accordance with communication quality required for the first packet and the second packet, and generates error correction encoded packets having the same data length from the first packet and the second packet using the selected coding rates;
• a network encoding circuit that performs network encoding on error correction encoded first and second packets to generate a network encoded packet;
• and
• a transmission circuit that transmits the network encoded packet to the plurality of wireless terminal station apparatuses, and
• among the plurality of wireless terminal station apparatuses, each of a wireless terminal station apparatus which stores a third packet equal to the first packet in a storing circuit and a wireless terminal station apparatus which stores a third packet equal to the second packet in a storing circuit comprises:
• an error correction encoding unit that performs error correction encoding on the third packet;
• a network decoding circuit that performs network decoding on the network encoded packet that has been received using an error correction encoded third packet to generate a decoded packet;
• and
• an error correction decoding unit that performs error correction decoding on the decoded packet.

A wireless terminal station apparatus in a wireless communication system provided with a wireless relay station apparatus that transmits a first packet and a second packet to a plurality of wireless terminal station apparatuses, the first packet being different from the second packet, the wireless terminal station apparatus comprising:

• a reception circuit that receives a network encoded packet, the network encoded packet being generated such that the wireless relay station apparatus selects coding rates to be used for the first packet and the second packet in accordance with communication quality required for the first packet and the second packet, generates error correction encoded packets having the same data length from the first packet and the second packet using the selected coding rates, and performs network encoding on error correction encoded first and second packets to generate the network encoded packet;
• a storing circuit that stores a third packet equal to one of the first packet and the second packet;
• an error correction encoding unit that performs error correction encoding on the third packet;
• a network decoding circuit that performs network decoding on the network encoded packet that has been received using an error correction encoded third packet to generate a decoded packet;
• and
• an error correction decoding unit that performs error correction decoding on the decoded packet.

A wireless communication method in a wireless communication system provided with a wireless relay station apparatus that transmits a first packet and a second packet to a plurality of wireless terminal station apparatuses, the first packet being different from the second packet, the wireless communication method comprising:

• a step of, by an error correction encoding unit of the wireless relay station apparatus, selecting coding rates to be used for the first packet and the second packet in accordance with communication quality required for the first packet and the second packet, and generating error correction encoded packets having the same data length from the first packet and the second packet using the selected coding rates;
• a step of, by a network encoding circuit of the wireless relay station apparatus, performing network encoding on error correction encoded first and second packets to generate a network encoded packet;
• a step of, by a transmission circuit of the wireless relay station apparatus, transmitting the network encoded packet to the plurality of wireless terminal station apparatuses;
• a step of, by an error correction encoding unit of a wireless terminal station apparatus which stores a third packet equal to the first packet in a storing circuit among the plurality of wireless terminal station apparatuses, performing error correction encoding on the stored third packet;
• a step of, by an error correction encoding unit of a wireless terminal station apparatus which stores a third packet equal to the second packet in a storing circuit among the plurality of wireless terminal station apparatuses, performing error correction encoding on the stored third packet;
• a step of, by network decoding circuits of the plurality of wireless terminal station apparatuses, performing network decoding on the network encoded packet that has been received using the error correction encoded third packet to generate a decoded packet;
• and
• a step of, by error correction decoding units of the plurality of wireless terminal station apparatuses, performing error correction decoding on the decoded packet.