Patent ID: 7680207

Claim:
A mobile communication system which carries out multicast communication, comprising: a first radio station configured to carry out the multicast communication with a first mobile station belonging to a specific multicast group; a second radio station configured to carry out the multicast communication with a second mobile station belonging to the specific multicast group, wherein each of the first and second mobile stations include a communication quality measurer configured to measure a communication quality of a signal transmitted from each of the first and second radio stations, respectively; and the first radio station comprises: a communication quality acquirer configured to acquire the communication quality from the first mobile station belonging to the specific multicast group, acquire a communication quality of a signal transmitted from the second radio station to the second mobile station belonging to the specific multicast group, and select the lowest communication quality from among the acquired communication qualities; a transmission method changer configured to determine a number of transmission signal repetitions by the multicast communication, in accordance with the selected lowest communication quality; and a transmitter configured to transmit the multicast communication to the first mobile station using the determined number of transmission signal repetitions.