Base station, terminal, and wireless communication system

A terminal that performs wireless communication with a base station by using a dedicated band dedicated to a wireless communication system including the base station and the terminal and a shared band shared with other systems, the terminal comprising:

• a receiver configured to receive using the dedicated band, a control signal including first information and second information, the first information indicating an uplink resource in the shared band to be used for data transmission by the terminal, the second information indicating a period to wait for a permission signal indicating the data transmission can be performed using the uplink resource, and to receive the permission signal for permitting transmission in the shared band transmitted via physical downlink channel from the base station with different timing from the control signal;
• and
• a transmitter configured to transmit to the base station using the uplink resource in the shared band specified by the control signal, wherein
• the control signal and/or the permission signal includes an offset indicating a time from receiving the permission signal to a start of transmission of data to the base station with reference to the permission signal transmitted from the base station, and
• the transmitter transmits data to the base station by using the uplink resource in the shared band specified by the control signal after a lapse of the time indicated by the offset since reception of the permission signal by the receiver.

A wireless communication system comprising:

• a base station;
• and
• a terminal, wherein
• the base station and the terminal perform wireless communication with each other by using a dedicated band dedicated to the wireless communication system and a shared band shared with other systems,
• the base station includes:
• a first transmitter configured to transmit, to the terminal using the dedicated band, a control signal including first information and second information, the first information indicating an uplink resource in the shared band to be used for data transmission by the terminal, the second information indicating a period to wait for a permission signal indicating the data transmission can be performed using the uplink resource;
• and
• a controller configured to determine whether the shared band is idle or busy, wherein
• the first transmitter transmits, to the terminal via physical downlink channel, the permission signal transmitted using the shared band with different timing from the control signal, the permission signal for permitting transmission in the shared band when the controller determines that the shared band is idle, and
• the control signal includes an offset indicating a time from receiving the permission signal to a start of transmission of data from the terminal to the base station with reference to the permission signal transmitted from the first transmitter,
• the terminal includes:
• a receiver configured to receive using the dedicated band, the control signal and receive using the shared band, the permission signal;
• a second transmitter configured to transmit data to the base station using the uplink resource in the shared band specified by the control signal after a lapse of the time indicated by the offset since reception of the permission signal by the receiver.