| 摘要 |
PROBLEM TO BE SOLVED: To improve determination accuracy of determining whether the control of multicast transmission (retransmission control and transmission rate control) should be performed or not.SOLUTION: A radio communication system according to the invention is a radio communication system including a base station device for transmitting communication data by multicast, and a plurality of radio terminal devices for receiving the communication data transmitted by multicast. Each radio terminal device (30) of the plurality of radio terminal devices comprises a phase setting unit (372) that sets each phase of one or multiple subcarriers to transmit a response signal when the communication data is received, and changes each phase of the one or multiple subcarriers whenever the response signal is transmitted. |
