| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of quickly and effectively searching an unused band for a cognitive communication terminal. SOLUTION: The searching method of the unused band employs the cognitive communication terminal which functions within an area covered by a communication system of a first generation using a number of frequency bands B. The terminal classifies the bands as functions of usable conditional probability (p(b<SB>max</SB>¾B<SB>occ</SB>, B<SB>opp</SB>)). The terminal starts its searching by the band having the most large conditional probability (b<SB>max</SB>) after knowing a first aggregation of a band which is exclusively possessed by a communication system (B<SB>occ</SB>) of the first generation and a second aggregation of a band which is not exclusively possessed by a communication system of the first generation though being already used by the other cognitive terminal (B<SB>opp</SB>). COPYRIGHT: (C)2009,JPO&INPIT
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