Patent ID: 11877272
Assignee: FUJITSU LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A terminal device comprising:
a receiver that receives a first data channel and a second data channel transmitted after the first data channel that are transmitted by using a frequency band for which a license is not needed to use in wireless communication;
a processor that executes a process including
decoding the first data channel,
decoding a control channel that includes control information that instructs to collectively feed back an acknowledgement related to the first data channel together with an acknowledgement related to the second data channel, and
generating, in accordance with the control information decoded, feedback information that includes the acknowledgement related to the first data channel and the acknowledgement related to the second data channel, judging whether the frequency band is being used by another device; and

a transmitter that transmits, when it is judged that the frequency band is not being used, the feedback information by using the frequency band.