| 主权项 |
1. A mobile communication system, which includes a first radio terminal, a second radio terminal, and a radio base station, wherein
the first radio terminal comprises: a first control unit that has a function of performing first communication of user data that is performed via the radio base station, and a function of performing second communication of user data that is directly performed between the first radio terminal and the second radio terminal without going through the radio base station, the second radio terminal comprises: a second control unit that has a function of performing first communication of user data that is performed via the radio base station, and a function of performing second communication of user data that is directly performed between the first radio terminal and the second radio terminal without going through the radio base station, and the mobile communication system comprises: a switching control unit that controls switching of communication to be performed by the second radio terminal between the first communication and the second communication, on the basis of received quality of a downlink signal received in the second radio terminal from the radio base station when the first radio terminal performs the first communication, and the first control unit relays user data, which is transferred through the second communication, between the second radio terminal and the radio base station when the first radio terminal performs the first communication and the second radio terminal performs the second communication. |
