MOBILE RADIO COMMUNICATION SYSTEM AND RADIO COMMUNICATION METHOD

摘要

In a mobile radio communication system of the cognitive radio method, a database device has a use state table indicating a probability that each frequency band is used for each period of time and for each location. An on-vehicle terminal acquires a frequency band having the highest probability that the band is empty at the current time and the current location according to the use state table and performs a radio communication by using the frequency band. The use state table is preferably created by a statistical process using the database device which acquires the use states of frequency bands of various locations and times by using respective vehicles as probe cars. Thus, it is possible to detect the frequency of the empty state in a short time.