Date Added: Jun 2011
In Cognitive Radio (CR) ad-hoc systems, the performance of system can be increased by using cooperation between cognitive users. In this paper, the authors compare three cooperation schemes for CR ad-hoc systems which are non-cooperation, sensing-cooperation and full-cooperation of sensing and band, in which the spectrum information or the band can be cooperatively shared among cognitive users. Unlike other cooperative sensing schemes which focus on cooperative sensing on single band, their cooperation model focuses on cooperative sensing on multiple bands. They propose the concept of spectrum pool which is the common knowledge on spectrum among cognitive users and this spectrum pool is maintained by sharing sensing results of sensing users on different bands.