| 摘要 |
PROBLEM TO BE SOLVED: To reduce processing loads of a base station and mobile stations in setting a group for a plurality of mobile stations.SOLUTION: A base station 10 stores group information corresponding to groups to which a radio device 20 can belong, in association with the radio device 20. The base station 10 transmits the group information to the radio device 20 via a relay station 60 in response to an authentication request from the radio device 20. The base station 10 generates call information determining a group that requests the radio device 20 to participate in the group. The base station 10 transmits the call information to the radio device 20 via the relay station 60. The radio device 20 determines whether the group determined in the call information received from the base station 10 includes the group corresponding to the group information. The radio device 20 participates in the group determined to be included in the group information. The radio device 20 performs data communication with other radio devices via the relay station 60. |
