Radio communication device, radio communication system, and radio communication method

A radio communication system comprising:

• a first radio communication device;
• and
• second radio communication devices,
• wherein at least one of the second radio communication devices includes
• a second communication circuit configured to transmit and receive a signal to and from other radio communication device, and
• a second control circuit configured to cause the second communication circuit to transmit, through a control channel in a first layer, first acknowledgement information to the other radio communication device, the first acknowledgement information indicating whether data in a second layer different from the first layer is normally received from the other radio communication device, and
• wherein the first radio communication device includes
• a first communication circuit configured to receive, through the control channel in the first layer, the first acknowledgement information from the at least one of the second radio communication devices.