| 摘要 |
PURPOSE:To always attain stable communication independently of moving position by allowing a base station to detect either transmission level of a mobile station or a relay station at least and regulating a transmitter-receiver so as to switch the frequency to that of either a mobile station or a relay station automatically. CONSTITUTION:When a mobile station is moving at a location disabling the communication with a base station, the base station receives a relay wave from a relay station by an antenna 2 and gives the result to an input/output terminal of a transmitter-receiver 5 via a distributer 1. Then it is possible for the base station and the mobile station to communicate with each other via the relay station. Furthermore, when the mobile station is at the outside of the communication enable area B of the relay station and moves within the communication enable area A of the base station, the base station receives a radio wave from the mobile station by the antenna 2 and gives it to an input terminal of a receiver 3 and an input/output terminal of the transmitter-receiver 4 via the distributer 1. Thus, the base station and the mobile station are communicated with each other directly. |
