Communication system, base station device, terminal device, communication method, and program

A terminal device for improving utilization efficiency of radio resources, the terminal device being any one of first and second terminal devices for communicating with a base station device, the terminal device comprising:

• a communication unit that communicates with the base station device;
• and
• a control unit that transmits, to the base station device, transmission data by using at least one or more resource blocks of the radio resources assigned, from the base station device, to both of the first and second terminal devices, the at least one or more resource blocks being able to be used by one of the first and second terminal devices,
• wherein, in a case that uplink data is transmitted to the base station device via the communication unit by using the at least one or more resource blocks of the radio resources assigned by the base station device, when there is no uplink data to be transmitted other than the uplink data, the control unit adds additional information to the uplink data, the additional information indicating that the terminal device associated with the control unit does not use a resource block in transmission after the resource block used in the transmission of the uplink data.

A communication method of improving utilization efficiency of radio resources in a base station device and first and second terminal devices, the communication method comprising:

• assigning, by the base station device, radio resources including at least one or more resource blocks to both of the first and second terminal devices, the at least one or more resource blocks being able to be used by one of the first and second terminal devices;
• identifying, by the base station device, at least one of unused resource blocks that is unused by the first terminal device among the at least one or more resource blocks of the radio resources assigned;
• assigning, by the base station device, the identified at least one of the unused resource blocks to the second terminal device different from the first terminal device;
• transmitting, by at least one of the first and second terminal devices, transmission data, to the base station device, by using the at least one or more resource blocks of the radio resources assigned by the base station device;
• and
• adding, in a case that uplink data is transmitted to the base station device by the at least one of the first and second terminal devices via using the at least one or more resource blocks of the radio resources assigned by the base station device, when there is no uplink data to be transmitted other than the uplink data, additional information indicating that the at least one of the first and second terminal devices does not use a resource block in transmission after the resource block used in the transmission of the uplink data.