Communication device and communication method

A communication method comprising:

• controlling, by a communication device, parallel transmission of data having a plurality of sequence numbers using a plurality of links in a wireless network;
• determining, by the communication device, undelivered data that needs to be retransmitted on the basis of reception acknowledgment information received on a first link of the plurality of links from a transmission destination of the data, the reception acknowledgment information being representative of the sequence number of the undelivered data and the reception acknowledgment information specifying, on a sequence number basis, a reception situation of data on at least one link other than the first link;
• and
• controlling, by the communication device, retransmission of the undelivered data.

A communication device comprising:

• circuitry configured to:
• control parallel reception of data having a plurality of sequence numbers using a plurality of links in a wireless network;
• set reception acknowledgment information including information capable of specifying, on a sequence number basis, a reception situation of the data;
• control return of the reception acknowledgment information on a first link of the plurality of links, the information of the reception acknowledgment information being representative of a sequence number of undelivered data and being capable of specifying the reception situation of the data on at least one link other than the first link;
• and
• control reception of retransmission data corresponding to the reception acknowledgment information using one of the plurality of links.

A communication method comprising:

• controlling, by a communication device, parallel reception of data having a plurality of sequence numbers using a plurality of links in a wireless network;
• setting, by the communication device, reception acknowledgment information including information capable of specifying, on a sequence number basis, a reception situation of the data;
• controlling, by the communication device, return of the reception acknowledgment information on a first link of the plurality of links, the information of the reception acknowledgment information being representative of a sequence number of undelivered data and being capable of specifying the reception situation of the data on at least one link other than the first link;
• and
• controlling, by the communication device, one of the plurality of links to receive retransmission data.