| 摘要 |
A base station ( 202 ) receives, from mobile stations ( 203 <SUB>1</SUB>- 203 <SUB>N</SUB>), notifications of transmission and reception powers thereof, which are input to a failure detecting part ( 218 ) together with the information about transmission and reception powers of the main device for the mobile stations. The failure detecting part ( 218 ) obtains upstream and downstream propagation losses of each one of propagation paths ( 204 <SUB>1</SUB>- 204 <SUB>N</SUB>). When the difference between those losses exceeds a predetermined tolerance, the failure detecting part ( 218 ) determines, based on such an exceeding difference, which one of the transmitters or receivers has a failure. In this way, there is no need to provide any special circuit for detecting a failure of a transmitter or receiver.
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