Abstract
In cognitive radio systems, users that are cognitive (unlicensed) must constantly scan the spectrum for primary (licensed) users to be present. In this article, the researchers display the benefits of cognitive radio collaboration. It is demonstrate that detection times can be reduced by motivating cognitive users to cooperate in the same band, thus increasing overall agility. Next, a cognitive two-user radio network is depicted and a method to exploit the inherent network asymmetry to improve agility. It is shown that our cooperation program improves the efficiency of cognitive users by 35%. The researchers then extend the cooperation scheme to two user-per-carrier multi-corporate networks and calculate the gain in asymptotic agility.
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