Cognitive Radio and Dynamic Spectrum Access represent two complementary developments that will refashion the world of wireless communication. In order to investigate the roles of knowledge representation and reasoning technologies in this domain, we have developed an experimental cognitive radio simulation environment.-Cognitive　Radio　and　Dynamic　Spectrum　Access represent　two　complementary　developments　that　will refashion　the　world　of　wireless　communication.　In order　to　investigate　the　roles　of　knowledge representation　and　reasoning　technologies　in　this domain, we have developed　an experimental　cognitive　radio　simulation　environment.