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

Claim 4:
5. A wireless communication system comprising:
a base station device; and
a terminal device, wherein
the base station device includes
a first processor that executes a process including
generating a first data channel,
generating a control channel that includes allocation information on the first data channel, group identifying information for identifying a group of data channel and control information that instructs to collectively feed back an acknowledgement related to the first data channel together with an acknowledgement related to a second data channel that belongs to a same group as the first data channel and that is transmitted after the first data channel, and
judging whether a frequency band for which a license is not needed to use in wireless communication is being used by another device, and

a transmitter that transmits, when it is judged that the frequency band is not being used, the first data channel and the control channel by using the frequency band, and
the terminal device includes
a receiver that receives the first data channel and the second data channel,
a second processor that executes a process including
decoding the first data channel,
decoding the control channel associated with the first 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 second data channel, judging whether the frequency band is being used by another device, and

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