| 摘要 |
<P>PROBLEM TO BE SOLVED: To control a method for sensing a communication environment to determine the availability of secondary usage of a frequency band according to the state of communication connection. <P>SOLUTION: There is provided a communication device comprising: a detection unit that detects presence or absence of communication connection with a server storing data related to a communication environment of a communication area where a first communication service is provided; a data collection unit that collects data related to a surrounding communication environment; and a determination unit that determines availability of usage of a second communication service using a part or whole of a frequency band assigned to the first communication service based on the data collected by the data collection unit, wherein when communication connection with the server is not detected by the detection unit, the data collection unit receives data related to a communication environment from another communication device located near the communication device. <P>COPYRIGHT: (C)2010,JPO&INPIT |
